With the development of mining, cement and other industries, more and more broken grinding equipment has been put into actual production. For large pieces of materials that cannot be directly transported, the crushing and grinding equipment has highlighted an irreplaceable advantage. The roller mill is the leader in the crusher.

First, the working principle of high pressure roller mill

1. High pressure roller mill composition

The structure of the high-pressure roller mill is various. The principle is basically similar to that of the roller crusher. There are two work rolls, but the grinding principle is completely different. The high-pressure roller mill is mainly composed of a feeding device, a pair of sticks, a transmission device (electric motor, a speed reducer), a hydraulic system and the like.

The working part of the high-pressure roller mill is a pair of high-pressure rolls arranged in parallel and facing each other. Each roller is driven by a motor through a planetary gear reducer, wherein the fixed roller is fixed in position and the moving roller can be moved on the horizontal slide. The hydraulic system on the sliding roller shaft provides extremely high working pressure to the work roll surface.

2. Principle of crushing of high pressure roller mill

The working principle of the high-pressure roller mill is laminating and pulverizing. During operation, the material enters between two oppositely rotating squeezing rollers through an adjustable opening size feeder, and the full feeding is performed, and the frictional force on the rolling surface is Under the action of the gravity of the column (or forced feeding device), the material is forcibly squeezed into the pressure zone and compacted. When a certain pressure is reached, it is crushed. As the roll gap becomes smaller, the pressure on the material is increased. The larger the sheet, the denser but crack-filled sheet cake falls. There are a large number of fine particles, fine particles and micro-cracks in the cake, which makes the mechanical strength of the cake low, which indirectly improves the processing capacity and grinding efficiency of the mill.

Second, high pressure roller mill application industry

High-pressure roller mills are not used separately in comminution operations and usually form a grinding system with other grinding equipment. The high-pressure roller mill has been used in the cement industry since its inception, so the grinding system in this field is also relatively mature. It is mainly used as a pre-grinding system, which can be divided into a circulating pre-grinding system, a combined grinding system, a hybrid grinding system, and a semi-finish grinding system.

1. Mixed grinding system for cement industry

The mixed grinding system is mostly used in the production of cement raw materials. The material is first crushed by a high-pressure roller mill and then finely ground into a ball mill. The coarse powder of the ball mill will be returned to the high-pressure roller mill for further pulverization, so that the high-pressure roller mill The task is aggravated.

2. High pressure roller mill for metal mining industry

With the modification and performance improvement of high-pressure roller mill equipment, the equipment has been used in the field of metal mines. In the iron ore dressing plant as fine or fine crushing equipment for raw ore, or as fine grinding equipment in front of iron concentrate pellets; as fine or superfine crushing equipment in non-ferrous metal mines, gold mines and other concentrators.

3. Other industries

In addition to its application in the cement industry, high-pressure roller mills are now used in diamonds, copper, platinum, molybdenum, gold and industrial minerals as technology develops and improves.

In addition, the high-pressure roller mill is also an ultra-fine grinding equipment with high efficiency and low consumption, which can be widely used for ultra-fine grinding of non-metallic minerals. For example, non-metallic minerals such as limestone, dolomite, natural magnesite, zircon and corundum are also commonly used in high-pressure roller mills for crushing and milling.

The compound crusher is a new type of high-efficiency fine crushing equipment which combines hammer breaking and counterattack breaking. It has large production capacity, high crushing efficiency, large crushing ratio, small abrasion amount, low energy consumption, good sealing performance and stable operation. The advantages of convenient maintenance, etc., when the building materials enterprise uses the equipment to crush materials such as limestone, coal, coal gangue and cement clinker, it can significantly reduce the grinding grain size and increase the mill output, which is an ideal energy-saving crushing equipment. Want to know more about the composite crusher? Then let’s take a look at the basic introduction, working principle, application range, characteristics, maintenance, troubleshooting, maintenance and safe operation procedures of the composite crusher.

First, the basic introduction

1. The composite crusher is a new generation of high-efficiency crusher which is based on the synthesis of similar crusher technology at home and abroad. It is designed and optimized for the main technical parameters. Its structure is composed of a hammer crusher and a counter crusher. It is especially suitable for crushing medium-hard and low-water content brittle materials in building materials, mining, chemical, metallurgy, cement, coal and other industries. In the cement industry, this equipment is used as secondary crushing;

2. The composite crusher belongs to the road construction machinery and relates to a composite soil crusher. The composite soil crusher comprises a soil crushing bin and a lime crushing bin, and a conveying belt is arranged below the discharge port of the lime crushing bin, and the front end of the conveying belt is located at the feeding port of the soil crushing bin.

3. The composite crusher uses a new type of device to omit the pre-hydration process of dry lime and effectively break the high-water-containing soil, which is conducive to the improvement of construction quality. The composite soil crusher is characterized in that it comprises a soil crushing bin and a lime crushing bin; a discharge port of the lime crushing bin; a conveying belt is arranged below; the front end of the conveying belt is located in the feed of the soil crushing bin. mouth.

Second, the working principle of the composite crusher

1. If the machine is found to be abnormal during normal operation, it should be stopped immediately and inspected. After the fault is removed, the production will continue.

2. The crusher should be turned on at no load to ensure that the crusher is fed after normal operation;

3. Before starting the machine, please pay attention to whether the body door of the machine body is closed, whether the lubricating oil is normal, whether the screw is loose, and the door is opened to make the machine stop.

4. The feed must strictly abide by the instructions for use, too much, too much will cause damage to the crusher.

Third, the scope of application

The composite crusher is widely used in various kinds of hard and brittle materials such as rock, abrasive, refractory, cement clinker, quartz stone, iron ore, concrete aggregate, etc. Sand and road sand are excellent.

Fourth, the characteristics

1. Large crushing ratio, high output, 1.4 times higher than domestic similar products, high efficiency, energy saving, wearing parts with high hardness, high toughness, multi-alloy wear-resistant material, life expectancy increased by 2-3 times, hammer and counterattack The gap between the plates is adjustable to meet a variety of material conditions;

2. The composite crusher is a combination of similar crusher technology at home and abroad, with the advantages of impact breaking and hammer breaking. The new fine crushed and coarsely ground products are optimized and designed for the main technical parameters. They are mainly used for medium and small crushed cement raw materials and clinker. They are used in construction sand, iron ore, sandstone, gypsum, coal gangue and lump coal. And other medium hard ore crushing;

3. It has the characteristics of large crushing ratio, low energy consumption, stable operation, simple structure, convenient operation and maintenance, etc. It is a kind of new multi-purpose, high-efficiency and low-cost new crushing equipment.

Five, compound crusher maintenance

The three-level maintenance system of the composite crusher embodies the shift of the focus of equipment maintenance management in China from repair to maintenance, and the maintenance management policy based on prevention is more clear. The three-stage maintenance system of the composite crusher includes: daily maintenance of the crusher equipment; primary maintenance and secondary maintenance. The three-level maintenance system is a mandatory maintenance system in which the operator is mainly responsible for the protection of the equipment and the warranty is important. The three-level maintenance system relies on all employees, giving full play to the enthusiasm of all members, implementing group management, combining groups, and improving the effective maintenance of equipment.

1, daily maintenance

The daily maintenance of the composite crusher equipment generally has daily maintenance and weekly maintenance, also known as daily maintenance and weekly maintenance;

2, first-level maintenance

The first-level maintenance of the composite crusher is based on the operator, the maintenance worker assists, partially disassembles and inspects the equipment according to the plan, cleans the specified parts, clears the oil circuit, pipeline, replaces or cleans the oil line, felt and oil filter. Adjust the matching clearance of each part of the equipment and fasten the various parts of the equipment. The time for the first-level maintenance is 2-4h. After the completion of the first-guarantee, the record should be recorded and the defects that have not been cleared should be recorded. The mechanical and electrical equipment department should check and accept the operation. Fill in the maintenance record in detail, and submit the acceptance form to the equipment department for filing;

3, secondary maintenance

The secondary maintenance of the composite crusher equipment is mainly based on maintenance workers, the operation workers participate in the completion, the secondary maintenance is included in the equipment maintenance plan, the equipment is partially disassembled and repaired, the worn parts are replaced or repaired, and the oil is cleaned and changed. Check and repair the electrical parts so that the technical condition of the equipment fully meets the requirements of the required equipment integrity standards. The time for secondary maintenance is about 1-3 days. After the secondary maintenance is completed, the maintenance workers should fill in the maintenance records in detail, and the mechanical and electrical equipment department Acceptance with the operator, the acceptance form is handed over to the Equipment Section for filing.

Sixth, troubleshooting

1, the phenomenon of failure: fine-grained

reason: more hammers;

Solution: Reduce one or two layers of hammers;

2, failure phenomenon: coarse grain size

Reason: loose belt or low speed;

Solution: tighten the belt and check if the voltage is 380V;

3, failure phenomenon: broken body swing

Reason: The centrifugal force of the rotor is not balanced;

Solution: Replace the new hammer or adjust the weight of the pusher.

Seven, composite crusher repair

1. The vertical composite crusher has a large crushing ratio, and the maximum crushing ratio can reach the discharge granularity and can be adjusted arbitrarily, which is not affected by the wear of the hammer and the lining;

2. No sieve bar setting, it is not easy to block when crushing materials with high moisture content and large mud content;

3. The use of elastic adjustment mechanism, into the non-breakable material can be automatically discharged, will not cause equipment damage;

4. The bearing horizontal arrangement, long life, can break high temperature materials (such as cement clinker), the rotor structure of the machine is unique, when the material is broken, the rotor body is hardly worn;

5. The rear cavity is provided with a screw rod or a hydraulic opening mechanism, and the wearing parts can be easily replaced without using the main equipment.

Eighth, safe operating procedures

1. Before starting the machine, check whether the door of the composite crusher is closed. Open the door to stop the machine to prevent danger.

2. The crusher must be started at no load, and it can be discharged after the normal operation;

3. The particle size of the material to be fed shall be in accordance with the requirements, and the equipment shall be damaged due to excessive assembly;

4. If abnormal phenomena are found during the crushing process, stop the inspection and eliminate the fault before production.

5. Regularly add lubricating oil to the rotating bearing parts.

As the main equipment for mining, the crusher equipment is mainly used for crushing stones of different sizes. Mainly used in cement, electric power, mining, metallurgy, building materials, highways, railways, water conservancy and other industries, processing marble, limestone, slag, building materials waste, coal gangue and other materials, the application field is very extensive, and the demand is large, purchased A good crusher not only improves the rate, saves energy, but also reduces the cost of use.

When purchasing a crusher, it should be considered from many aspects, considering the characteristics of the material itself, such as the type and hardness of the material, the water content, the degree of splitting, the size of the material entering and exiting, the construction site and the output.

Crusher buying tips

1. Material type and hardness

Material type and hardness are important principles in selecting a crusher. The hardness of different materials is different, and the hardness of the material is usually expressed by Mohs hardness. The molar hardness is divided into 10 grades. The greater the molar hardness, the harder it is to break the ore and vice versa.

2. Water content of the material

The moisture content of the material will also affect the choice of crusher. When the moisture content is too large, the fine material will agglomerate or stick to the coarse particulate material due to the increase of humidity, thereby increasing the viscosity of the material, reducing the drainage speed of the ore, and reducing the production efficiency. If the situation is serious, it may even cause the drain to be blocked, which will affect normal production.

3. Structural density of materials

The degree of structural density of the material also directly affects the productivity of the crusher – when the ore breaks, it is easy to break along the cleavage plane. Therefore, the productivity of the broken ore that solves the haircut is much higher than that of the dense structure of the broken structure.

4. Particle size of feed and discharge

The particle size of the feed and discharge is used to determine the type of comminution equipment and the degree of comminution. If the content of coarse particles (large dry discharge port size) in the crushed material is high, or the maximum feed block and feed width are relatively large, the crushing ratio that the crusher needs to achieve (the particle size of the material before crushing and the material after crushing) The ratio of the particle diameters is large. Therefore, the production efficiency is lowered. If the fine particle content of the crushed material (close to or smaller than the size of the discharge port) is larger, or the ratio of the maximum feed block to the feed width is smaller, the crushing to be achieved is relatively small, and should be correspondingly Improve the productivity of crushed materials.

5. Broken work site

The construction site area is also one of the factors that people should consider when choosing a crusher. In addition, the location of the crushing equipment also affects the choice of crusher.

6. Production capacity

Production capacity is also an important indicator for determining the selection of crushing equipment. The traditional understanding is that the higher the production requirements, the larger the specifications of the required crushing equipment, and the corresponding inputs and outputs will increase.

Crusher purchase considerations

1, choose the right one

Before we buy the crusher, we must first determine what materials we want to work on. We should determine which type of crusher should be used according to our own needs, and which size of the crusher.

In addition, the specific gravity of the ore should be considered. The specific gravity of the ore is directly proportional to the productivity of the crusher. The same crusher will have different productivity when dealing with ore with different specific gravity. There is also the total production volume and distribution requirements of the finished product, according to the choice of crusher type and production capacity; physical properties of the material, such as friability, viscosity, moisture sediment content and larger feed size; technical and economic indicators, do To meet the requirements of quality and quantity, easy to operate, reliable work, and a large amount of cost savings; crushing equipment is a big investment, customers must be cautious when choosing.

2, structural performance

Reasonable structure and excellent performance are prerequisites for the purchase of high-quality equipment. Therefore, the equipment should be carefully checked and compared. If necessary, the equipment can be tested and operated to ensure the safety of the equipment. The purchase is carried out under the guidance of the industry, in order to obtain satisfactory equipment, such equipment is not prone to failure during the work process, and the energy consumption is lower, and the economic benefits created for the user are more considerable. After comparing the structural performance to ensure safety, we should also pay attention to the rate of equipment to enhance economic benefits.

3, equipment work efficiency

The working efficiency of the equipment can be judged from the actual situation of the crushing equipment in operation. When the crushing equipment is broken, the crushing speed is faster. When the machine starts feeding, the crushing operation will start. The material will be broken successfully without too long, and the broken material has uniform particle size; and the quality is not good. Although the crushing equipment can also break the stone smoothly, the crushing speed is very slow, which not only delays the rate of industrial construction, but also the particle size of the material after being crushed is very uneven.

In addition, when the content of coarse particles (large dry discharge port size) in the crushed material is high or the ratio of the larger size of the ore feed to the width of the feed port is large, the crusher needs to achieve a large crushing ratio, so the productivity is lowered; When the content of fine material (close to or smaller than the size of the discharge port) is large or the ratio of the larger size of the ore to the width of the ore is small, the crushing ratio to be achieved is small, so the productivity is increased correspondingly.

For the equipment rate, it is very important to choose the crusher manufacturer of the family business. The professional manufacturer meets to understand the various conditions of the user’s specific site, and for various variables, material properties, potential by-products of the mining area and quarry, The final product nature and other factors that may affect the process performance are evaluated; after fully understanding the user’s production line capacity, final grain size, grain type requirements and user investment cost budget, choose the right, economic, and productivity for the customer. High crushing equipment, pay attention to the quality of the equipment while paying attention to the rate.

4, equipment quality

The crusher is a very complicated process, so we must choose the manufacturer of the industry when selecting the equipment. In addition, the sealability of the joint of the crusher can be tested. The test can be carried out by loading not less than 10 red bricks into the machine for crushing. The standard of the seal should be that the joint does not leak ash; the non-broken material falls into the machine for the safety test. The cast iron parts can be selected for testing; the quality of the rust removal of the welded structural parts can be tested by the sample comparison method or by the stop test method; the discharge size can be determined by the sieve set of the standard mesh holes; the production capacity can be used continuously. The operation is measured by the time-folding algorithm; the test of the withstand voltage performance of the electrical control box edge resistance is to comply with the provisions of GB/T5226.1, etc., to detect the quality of the crusher equipment. When we have tested the quality of the equipment, we must pay attention to whether the after-sales service of this manufacturer is in place. This also determines whether the equipment can be solved in time and not delayed if the equipment encounters problems.

5, after sales service

As we all know, the health service can make users have no worries, especially in the after-sales service. For the user, in order to ensure the company’s future production profit, investment costs, operating costs, design rates, operating standards, maintenance, parts inventory and stacking methods must be considered.

Regular crushing equipment manufacturers should include: providing professional transportation services. If users need technical services, they will send technical service personnel to open the acceptance and guide the installation and commissioning work until the equipment is in normal operation; Train technicians for customers to keep them informed of equipment usage, maintenance and simple repair techniques. In the process of production equipment failure, the manufacturer must come up with a clear solution within 24 hours after receiving the customer’s call, and will quickly solve the problem by first recovering the production and then investigating responsibility. When we determine the quality, performance, rate and after-sales of the equipment, we must pay attention to the price of equipment. The price is the core factor of our concern, and it is also related to the immediate interests of the manufacturers. Therefore, the price/performance ratio of the products is also an important factor in our decision to purchase. .

6, equipment price

Reasonable prices can reduce the cost of the previous period. Only affordable and cheap equipment can be praised and favored. At the same time, the price factors are also multi-faceted. Only after continuous comparison can we buy affordable crusher equipment. The crusher manufacturers have large, medium and small, so the price of the crushing equipment naturally has high, medium and low points. But the low price does not mean that it is really cheap. The comprehensive cost performance of the crushing equipment is what users should pay more attention to. In order to buy a cost-effective crushing equipment, it is recommended that users choose a larger crushing equipment manufacturer, but they must choose the crushing equipment manufacturer of the industry, and better manufacturers can develop high and excellent equipment. When choosing, you should have a general understanding of the manufacturer’s credibility, comprehensive strength, and technical level.

The above are some tips and purchase precautions when purchasing the crusher. When purchasing the crusher, you must also select the quality of the production equipment after the comparison, the reputation is high, the after-sales service is good, so you can purchase the qualified The crusher also relieves the worries of the purchase.

The ball press is a molding device that presses a loose powder into a ball with a rotating press roll with a hemispherical groove. Any metallurgical industry waste, auxiliary materials need to be on the furnace, all need to press the ball machine to complete. For example: dust ash, pool mud, oxide scale, steel slag, iron concentrate, aluminum ash powder, silico-manganese ore powder, and so on. Various powders (such as magnesia, bauxite, dolomite, iron powder, etc.) can be used for metallurgy, chemical industry, etc. by forced pressurization, pre-pressing spiral precision processing, and making ball blanks with higher density. Coal and refractory industries. The ball making block of colored and ferrous metal ore powder is directly smelted into the furnace to increase the added value.

The ball press is mainly used to suppress various powders, powders, scraps and waste residues. It is widely used in refractory materials, power plants, metallurgy, chemical industry, energy, transportation, heating and other industries. It is easy to transport, improves the utilization rate of waste, and has good economic and social benefits.

Pressure ball machine

1. The feeding part is mainly to realize the quantitative feeding to ensure that the material evenly enters between the rolls. The screw feeding device is driven by the electromagnetic speed regulating motor, and is rotated by the pulley and the worm reducer to force the pressed material into the main feeding port. Due to the constant moment characteristic of the electromagnetic speed regulating motor, when the amount of material of the screw feeder is equal to the amount of material required by the main machine, a constant supply pressure can be maintained to stabilize the quality of the pellet. If the feeding amount is too large, the feeding device is overloaded; if the feeding amount is too small, the ball is not formed. Therefore, the skilled operation technique is an important condition for ensuring the normal operation of the ball.

2. The transmission part, the main drive system is: motor – triangular belt – reducer – open gear – roll. The main engine is powered by an electromagnetic speed regulating motor, which is transmitted to the driving shaft through a pin and pin coupling through a pulley and a cylindrical gear reducer. The drive shaft and the passive shaft ensure synchronized operation through open gears. The passive bearing housing is equipped with hydraulics at the rear. The hydraulic protection device is driven by a hydraulic pump to drive high-pressure oil into the hydraulic cylinder to cause axial displacement of the piston. The front joint of the piston rod is placed on the bearing housing to meet production pressure requirements.

3. The molding part mainly refers to the main part, and the core part is the roll. When the feed between the two pressure rollers is too much or enters the metal block, the hydraulic cylinder piston rod is under pressure overload, the hydraulic pump will stop, the accumulator will buffer the pressure change, the relief valve will open the oil return, and the piston rod will be displaced. The gap between the pressure rollers is increased to allow the hard object to pass through the pressure roller, and the system pressure returns to normal, thereby protecting the pressure roller from damage. The machine can adjust the pressure according to the requirements of the pressure ball density, and the production is flexible.

The technician of the ball press machine should be familiar with the process flow and operating procedures, concentrate on the operation, contact the post in time when encountering problems, report the situation to the leader, coordinate the treatment, and keep abreast of the production situation and the operation of the mechanical equipment. Next, the Asian Union Xiaobian introduces you to the operating procedures of the high pressure ball press.

Ball press operating procedures

Before we understand the operating procedures, let’s take a look at how the ball press is installed, understand the structure of the installation, and understand how to operate safely.

1. Pressure ball machine installation

Before installing the ball press, the pipeline should be laid in strict accordance with the electrical specifications, and the strong and weak signal lines should be isolated and worn to avoid interference. In an outdoor open environment, independent external lightning protection measures should be taken. The dome itself should also be well grounded to prevent static buildup and other effects on the dome. When installing, properly connect the power cable, communication cable and video cable. When connecting, carefully refer to the installation instructions to confirm the communication method and corresponding pin definition. Generally, the equipment should be installed in the later stage of construction to avoid a large amount of dust on the construction site from invading the ball machine, directly affecting its use effect and life.

2. The ball machine operating procedures

(1) Preparation before starting the machine: Check whether the various control devices are flexible and reliable. Check whether the mechanical parts are normal. Pay attention to whether the screws are loose or not, because the use will vibrate, the transmission parts are flexible, and the lubrication is comprehensive. Before starting the machine, look at the hydraulic cylinder is full, do not burn the machine because of less oil.

(2) Boot. Open the ball machine → open the belt conveyor. After 3-5 minutes of idling, start the feeding and put down the feeder.

(3) During the operation of the ball press, always pay attention to the presence or absence of hard foreign matter in the raw materials. If any hard foreign matter is found, it should be removed immediately. To see if there is noise, if the noise is particularly loud, you should stop the inspection. During the operation, see if there is a fever in a certain part, such as a motor, etc. Don’t burn the motor because it can’t be hot.

(4) Whether the operator concentrates on the work and ensures that all parts and links of the machine are working properly. Due to the hard texture of the mineral powder, the improper size of the abrasive particles may cause damage to the roller, and the operator should control it in place. The operator should be proficient in the details of the pressure of the ball press, the right amount of raw materials, and so on. Therefore, excellent operators are an important part of improving the working efficiency and service life of the ball press.

(5) Downtime.

Pressure ball machine operation precautions

The main body of the ball press machine is powered by an electromagnetic speed regulating motor, which is transmitted to the drive shaft through a pin and pin coupling through a pulley and a cylindrical gear reducer. The drive shaft and the passive shaft ensure synchronized operation through open gears. The passive bearing housing is equipped with hydraulics at the rear. The screw feeding device is driven by the electromagnetic speed regulating motor, and is rotated by the pulley and the worm reducer to force the pressed material into the main feeding port.

1. During the succession of the ball press operator, it is necessary to check the overall sanitation of the ball press. If the double-roll ball socket of the ball press is not clean, it will lead to uneven feeding and will affect the output of the ball press. It also causes damage to the pressure roller.

2. The ball press should be inspected before starting the machine. The ball press must be fully prepared and rigorously inspected before starting normally. The components must be complete and complete, and all the fixing bolts and anchor nuts must be completed. It should be firmly tightened, and the machine accessories must not have any things or things that hinder the operation. After the inspection is completed, the production can be started. After the rotation speed of the ball press is normal, the material can be fed into the machine. The feeding must be uniform. When stopping, stop the feeding of the machine first. Wait until there is no remaining material in the hopper to stop the machine. .

3. After the ball machine is set up and the equipment is in normal operation, it should be noted that the conveyor conveys the material evenly, not too much, too much. Is the shooting rate normal? If the ball formation rate is too low or other conditions, you need to check the parking. Also, pay attention to whether there is abnormal sound in the production of the ball press. If the sound is too loud, you need to check it quickly. In addition, it is necessary to check whether all the fixing bolts have broken and loose signs during the operation of the equipment. Check the lubrication of each bearing is normal, with or without signs of overheating. Check whether the seals are tight and there are no signs of oil leakage. Check that the operation of the pressure roller and gear is normal.

4. In the production process of the ball press, keep the surrounding of the ball press machine at all times. If there is any leakage or sprinkling, it should be cleaned up in time. Be sure to be hygienic during work.

In the actual production process of the ball press, it is necessary to follow the standard operating procedures, reasonably arrange the production time, and must not continue to run continuously without exceeding the tolerance of the equipment. When starting, be careful not to start with load, otherwise there will be a crash and it will affect the motor.

The ball press must ensure that it is able to do its best. In the work, it must comply with the design and do not overload. When the parts meet the above-average design load, the wear will be intensified and the service life will be shortened. When the other conditions are the same, the stable load is less wear than the dynamic load, the fault is less, and the life is constant.

 

If you want to press the powder material into pellets, you need not only the briquetting equipment, but also some auxiliary equipment to complete the whole pellet pressing work. In the process of briquetting, the texture of the material will affect the forming of the dry powder briquetting machine, and the feeding method and the speed and quantity of the feeding will directly affect the pellet forming. Therefore, we must pay special attention to the production of dry powder briquetting. materials. To achieve the ideal and satisfactory molding quality, it is necessary to adjust at various angles and multiple links in the operation of the dry powder briquetting machine.

Because every link is not in place, it can become a source of problems and failures. For example, if the material is too wet, it may cause a series of problems such as machine blockage, unmode release, and insufficient strength of the egg. In the previous section, we introduced the texture of the material. The briquetting machine manufacturer introduced some precautions about the material placement.

Dry powder briquetting machine equipment needs attention when placing materials

1. The order of the operation. According to the specifications, the order of some links must be followed. When the material is placed, it is no longer possible to start the feeding operation without starting the briquetting machine, otherwise the load of the motor will be greatly increased. Many times the damage of the motor is caused by the direct loading at startup. After starting, we recommend to idle for a few minutes and then it is most suitable when feeding.

2. Whether the feeding is uniform. Excessive material placement or material breakage is two situations that should be avoided in the production of dry powder briquetting machines. If the material is placed too hard, the load of the briquetting machine becomes large and the clogging is prone to occur. The material is cut off, which delays the production work and reduces the efficiency. Therefore, the uniform delivery of materials according to the specific situation is the best way.

The ball press is a kind of equipment for pressing powdery materials into balls. Many users pay special attention to the quality of the press rolls when purchasing the ball press equipment. In fact, when the pressure roller is attached, the key to the molding of the pressure ball machine lies in the pressure. Therefore, do not ignore the molding pressure when purchasing. The pressure of the ball press comes from several aspects:

1. The thrust of the hydraulic cylinder

The use of a hydraulic device and a hydraulic pump enables a constant pressure to be maintained between the rolls to shape the material.

2. the speed of the roll skin

Adjusting the speed of the roller skin should work hard on the ratio of the motor and the reducer. Now, for the small-type ball press, the electromagnetic speed-regulating motor is mainly used, and the speed of the motor is adjusted by the governor to adjust the speed of the ball press. However, the current largest electromagnetic speed regulating motor is only 90kw, how to adjust the large dry powder ball machine? That only uses a better variable frequency motor. The speed of the motor is adjusted by adjusting the frequency of the motor supply to adjust the speed of the ball press. Adjust the rotation speed of the ball press to lengthen the pressure of the material between the roller skins of the ball press, so that the molding effect is optimal.

In the actual operation of the ball press, iron pieces, stones and other hard objects are strictly prohibited from entering the machine. The particle size of the material to be processed must be less than 3 mm. It is strictly forbidden to start under heavy load. It is strictly forbidden for non-technical personnel to dismantle and adjust the equipment. Care and observe if the gear unit and housing are short of oil.

The ball press structure consists of three parts

Feeding part: If the feeding amount is too large, the feeding device is electrically overloaded, and if the feeding amount is too small, the ball is not formed.

Transmission part: The main machine is powered by the electromagnetic speed regulating motor, which is transmitted to the drive shaft through the pulley pin and the cylindrical gear reducer through the pin coupling.

Forming part: The core part is the roll. Therefore, it is very important to choose a professional pressure ball machine with high molding pressure.

In order to ensure the normal operation of the ball press, it is transmitted to the reducer. The reducer passes through the coupling and is transmitted to the drive shaft and then by a pair of open gears. The forming pressure is rapidly reduced to make the material enter the off-ball state and smoothly take off the ball. The data line and video line inside the ball press have been grounded accordingly, and the GND end of the ball press is connected to the ground to ensure that the device is effectively grounded. Therefore, it is very important to choose a professional pressure ball machine with high molding pressure.

In order to ensure the molding strength of the product, the molding pressure should be ensured, and the pressure is different from the diameter and width of the pressure roller, the distance between the two pressure rollers, the distance between the pressure rollers, the rotation speed of the pressure roller, and the shape and size of the bowl. The factors are related, and these specific parameter controls can be referred to the safety production guidelines. In addition, the structure of the ball press mechanism is also very important. If the parts of the machine can work together, we can safely produce it. If the parts are not coordinated, it may affect the production efficiency.

The roller press of the ball press is also a cause of influence on the molding. As long as the material and quality of the press roller can be guaranteed, basically the molding will not be affected by this. Therefore, you want the molding rate of your machine and equipment to be guaranteed. The first thing to do is to choose a good machine with a good quality letter.

When the ball ball is misaligned, the sleeve bolt can be loosened or the roller skin can be loosened with the shaft. After the ball is adjusted, the bolt can be tightened, or the roller bearing can be replaced. It can also be treated by re-grinding after welding. The deformation of the ball socket can also cause the pressing to be unformed or the shape is not uniform, and it is only necessary to repair or replace the ball socket. There is a gap between the two pairs of rollers. If there is a gap between the two rollers, the contact area of ​​the material in the two pressure rollers is reduced, and some materials are not pressed by the pressure roller, resulting in a “burr” of the finished ball of the ball pressing machine. In this case, we can adjust the gap of the pressure roller to the roller. Note that the gap between the two roller skins of the ball press machine is too small. Too small and too tight will cause the two rollers to lock and cannot rotate. Will reduce the life of the ball press roll.

There are many reasons that affect the press molding of the ball press. In addition to the factors mentioned in the ball press equipment itself, it may be that the particle size of the pulverized coal does not meet the requirements, the dry humidity of the pulverized coal is not adjusted well, and the selection process is made during the production process. The binder is not suitable for the selection of pulverized coal.

When the ball press presses the briquette material, it has requirements for its water content and material humidity:

1. Water content of briquette materials

The humidity (water content) of the ball press is too large, and it is prone to sticking to the ball. The strength of the finished ball is not enough. Under normal circumstances, the pressure ball machine must adjust the humidity and particle size of the material before pressing the material. The moisture contained in the material must be strictly controlled.

2. At which stage does the pressure ball machine regulate the material humidity?

The production process of the ball press is mainly: four processes of crushing, stirring, ball pressing and drying. Generally, it must be mastered at the mixer. When the item is too dry, it is easy to appear the signs of the two hemispheres and the broken ball when the ball is pressed; the item is too wet, and the ball is simply formed when the ball is pressed, and the ball-filled items of the briquette are not out of the ball and the car is boring.

3. During the ball pressing process of the ball press, the binder used is different. Is the water content debugging range the same?

With different binders, the water content debugging range is also different, because different binders have different physical and chemical properties. The amount added is also different. Under normal circumstances, the binder adopts cement and clay to form water with a moisture content of 18-20%; when the binder adopts magma or humic acid, the moisture content is 10-12%; when the composite binder is used, the moisture is 11 -13%; the binder is 2-4% when the asphalt is formed; the moisture is 12-18% when the binder is not formed, and the moisture is 15-15 when the binderless liquefied hard coal is extruded. 18%; moisture without binder is less than 2% when formed.

The ball-forming rate of the ball press is a standard for judging the quality of the ball press. The main function of the ball press is to press the material into a ball. Therefore, the level of the ball is one of the factors determining the quality of the device. Therefore, the pressure of the ball press must meet the standard, which also requires the quality of the ball press to pass.

Abstract

High pressure grinding roll has been widely popularized and applied in metallurgical industry and mining industry in the industry-advanced countries around the world. However, its application in our country is still in infancy. This paper is going to briefly introduce the structure and working principle of high pressure grinding roll, its advantages such as high efficiency, energy conservation and environmental protection, and the reach study of grinding iron ore.

Introduction of high pressure grinding roll (HPGR)

High pressure grinding roll is a kind of advanced grinding equipment developed by Germany scientists in the 1980s. It was popularized soon in USA, German, Russian, Brazil, Chile, Australia and other advanced industrial counties because of simple structure, high production efficiency, environmental protection and energy-saving and advanced working principle. Our country introduced the manufacturing technology of HPGR from KHD, a Germany Company. It was firstly applied in the grinding of cement clinker which achieved obvious effects. So, the machine was widely promoted and applied. Figure 1 is the main frame of HPGR produced in domestic.

High pressure grinding roll

After more than twenty years of production practice and learning from introduced technology, high pressure grinding roll has formed product seriation and been applied in national large-medium size cement enterprises for grinding cement clinker. It has been proved that HPGR manufactured in domestic can replace imported ones completely after years of production practice. In metallurgical industry, high pressure grinding roll has been successfully used in the pelletizing feed production of grinding fine iron in sintering plant for recent years which also achieves very good results. However, it is still no successful examples to use domestic high pressure grinding roll for comminuting metallic ore in the area of mineral separation.

Mechanism and structure of HPGR

(1)Mechanism

Forces from other particles

High pressure grinding roll is designed according to the principle of inter-particle breakage by huge pressures. The pressure is from a pair of counter-rotating rolls with the same diameter and rotary speed. One is fixed while the other is allowed to shift front and back slightly. Pressures are worked on the bearing supports at the both ends of floating roll through high pressure cylinder. While HPGR is operating, materials are entering into the crushing cavity by its gravity from stock column bin, and then are bitten by the two counter-rotating rolls, forced into compacting cavity. Duo to the gap reduction between two rolls, compression force increases. Material particles are compressed by roll surfaces directly but also other particles, leading to material particles compacted and pre-crushed. When rolls are rotated to the horizontal center line, pressures reach to peak. Particles are crushed in different degrees. With the rotation of rolls, materials are discharged in the form of tablets. Figure 3 displays the grinding process of material between rolls.

(2)Structure of HPGR

The following is the composition of HPGR. Feed device is mounted on the rack of frame. Compression rolls are mounted on the rack bed supported by bearings. Each roll has independent drive system. Energy is delivered to compressing rolls through universal coupling, safety clutch and planetary gear reducer. Centro-lubricating system supplies lubricating oil and grease to all bearings. HPGR adopts PLC smart control designed with field control, central control chamber control, hand control and automatic control, watching all work procedures and machine operating dates automatically through the central control chamber.

structure

Wear parts of HPGR is mainly tyre with stud around the compressing rolls. Tyres are manufactured by wear-resistant alloy steel. Studs adopt tungsten carbide material.

While HPGR is working, wear-resistant performances of rolls depend on the formation of auto-genous wear protection layer when materials are fulfilling the zones among studs. Roll surfaces are protected without contact with ores directly .

auto-genous wear protection layer

Therefore, tyres’ service life can be extended effectively. Tungsten carbide studs have high hardness and great abrasion-resistant performance but are brittle and easily chipped or broken. Hence, it is inevitable to be broken or damaged during operation. The assembly of studs and roll surfaces of imported machines adopts interference fit so that studs can be repaired if broken.

The benefits of HPRG

(1)Compared to the same kind of equipments, high pressure grinding roll is lower energy-consumption because of its working principle that inter-particle breakage makes particles contact more and interact much to utilize energy in high ratio. Therefore, its breaking energy-consumption is apparently lower than common single particle breaking equipments’ or milling equipments’. According to the production practice at home and broad, for most of ores, their breaking energy consumption is 0.8-3kwh/t. if the machine are mounted with the following-up equipments, the total grinding energy consumption can reduce by more than 40%.

(2)It can process materials with relatively high moisture. HPGR expects the feed can contain some moisture during operation so that would be better to form the sturdy auto-genous wear layer to improve its working condition and roll surfaces’ service life. For instance, feed moisture content can be up to 10% when grinding iron ore for briquetting. When grinding iron ore or precious metal ore, the foreigner recommended moisture content should be no more than 8%.

(3)It can improve the recovery rate, grindability and capacity of products in the following-up process. Based on the picture 6, particles processed by HPGR, have a lot of micro-cracking. Particles without micro-cracking are having internal stress due to undertaking pressure. Therefore, these particles re-processed in next step such as entering into ball mill can be grinded and levigated easily, improving grindability greatly and productivity of following-up process.

(4)The machine has less occupation and less civil engineering investment. HPGR has compact structure, less weight, small outline size; its grinding and crushing are occurred between two rolls. Produced static pressure are absorbed totally by the rack with less force on the foundation even none. So, compared to the same kinds of grinding equipments, HPGR does not need very sturdy foundation which can save a lot of civil engineering investment.

(5)The machine has less vibration, lower noises and less dust. During its working, grinding relies on the static pressure. When grinding, materials are in a closed cavity between rolls and feed device. Therefore, there is no any impacting phenomenon and material splashing phenomenon. That is why vibration, noises and dust are less.

(6)Its operating rate is high, up to over 95%. HPGR adopts the advanced auto-control and auto-inspection system to monitor and control the main indexes such as temperature, roll gap, pressure, feed volume, and power which could guarantee the normal working of main frame. Meanwhile, good anti-abrasiveness of roll material and advanced roll surface can prolong the effective working time greatly.

(7)Wearing parts can work longer. The wearing parts of machine are tyres over rolls. The auto-genous wear layer can protect roll surface to not contact or impact with ores. Abrasion is mainly occurred on the tungsten carbide studs so that service life of roll surface can be prolonged greatly. Moreover, if tungsten carbide studs are broken partly, broken parts can be repaired and replaced. In that case, service life of roll surface can be up to 10000-20000 hours. The lateral plate at the bottom of stock column adopts new composite material, and its service life can be ensured to use more than one year. The plate has small volume, only a few kilograms, which is also easy to replace.

The Application of HPGR

High pressure grinding roll has been widely used in our country for more than twenty years since its manufacturing technology was introduced from Germany. Its application in building material industry is the most successful and common, and also localization rate is the most higher. So to speak, domestic large-medium cement companies are all equipped with homemade high pressure grinding roll machines and achieved very well economic benefits and social benefits. At the beginning of 20 century, HPGR has been used in metallurgical industry. Wuhan Iron and Steel Corp. Chengchao pellet plant introduced a unit of high pressure grinding roll from KHD Humboldt Wedag International AG to use in the feed of grinding iron ore pellets which also achieved very well results. Liuzhou Iron and Steel Company pellet plant, Kunming Iron and Steel Holding Corporation pellet plant, Handan Iron and Steel group Corporation sintering plant and Shagang Group Corporation sintering plant were introduced HPGR successively with different models and expensive price to use in grinding iron ore feed. In 2003, Hangzhou Iron and Steel Group Company asked to cooperate with Citic Heavy Industries Corporation to research and develop high pressure grinding roll machines used in grinding iron ore feed to save foreign exchange for the country. After more than one year of tests and studies, the first domestic HPGR used in metallurgical industry were finally produced successfully in 2005. After many years of production practice, its technical properties had reached the level of imported equipments.

Now, homemade HPGR is successively used in domestic sintering plants such as Lengshuijiang Sintering Plant, Tianjin Rongcheng Iron and Steel pellet plant, and Shougang Changzhi Iron and Steel Corporation Sintering Plant. HPGR’s application in mineral processing industry was beginning at 2004. In this field, the first mover was Magang Group Nanshan Mine Company Aoshan Mineral processing plant introduced the first HPGR to use in find grinding iron ore from Germany Köppern Company. Since it was put into production in 2006, product quality, capacity and cost were all achieved well results due to its good functions and properties. Then, Many mineral processing plants such as Shanxi Jinduicheng Molybdenum Group Baihualing Mineral Processing Plant, Sijiaying Mine Company Iron Processing Plant, Shandong Gold Group Sanshan Island Gold Ore Processing Plant, Magang Heshangqiao Iron Processing Plant and Huoqiu Zhangzhuang Ore Processing Plant and so on, were introduced different models of high pressure grinding roll one after another from Germany which also caused national much foreign exchange to flow into foreigners. Meanwhile, it also aroused the enthusiasm of national manufacturers to research and exploit domestic HPGR used in mineral processing. We believe that domestic high pressure grinding roll would be applied in mineral processing industry more and more in the near future.

Grinding Test of Iron Ore

Our company begun to research and develop HPGR applied in breaking ore in 2008 and produced a unit of GM52-14 HPGR for tests. We had done many tests for mineral processing plants such as Shougang Tonggang Group Concentrator, an Indonesia Concentrator and Henan Dongda Concentrator, providing reliable technical base for model selection, drawing up production technological process and design products.

In the following, we just take Indonesia Iron ore breaking as an example to introduce the test of grinding test:

(1)Task

Authorized by a Indonesia mine company, we did test to process iron ore from their mine by high pressure grinding roll.

(2)Original condition of iron ore

A. Ore size

Indonesia Iron ore

Iron ore provided by the Indonesia mine was different from 20mm to 150mm. Iron grade and composition inside of ore were not clear. Ores were expressed to our company by air .

B. Moisture content of iron ore

Before delivery, moisture content was about 11%. Due to international express, customs clearance and inspection and other tedious procedures, it took about one month to send ores from Indonesia to us. Besides, due to the continental climate, moisture content of ores was only 3.8% by test after arriving at our company.

C. Hardness of iron ore

The delivered Ore hardness was different. For these soft ones, protodyakonov coefficient of rock strength was only 4 to 6, which was easily crushed by hand hammer. For hard ones, it was 13 to 17 grades which were different to be crushed.

(3)Test requirements

A. Moisture content of ore

To recovery the moisture content of Indonesia ore, we put ores with moisture content 3.8% into water for ten days (see picture 2). Then its moisture content was 11% by test which was almost the same with original ores before delivery. That would ensure test was reliable.

B. Ore sizes

According to the technological process of Indonesia, feeding size should be 30-40mm for HPGR. So, ores were crushed based on the above requirements with little crushed aggregates.

ores for test

In the test, moisture content of ores had two kinds, the lowest 3.8% and highest 11%. It took 60kg ores for this test. And 20kg was ores with 3.8% moisture content and 40kg was with moisture content 11%.

Particles processed by HPGR are classified according to their size to see the result of grinding.

(4)Test purpose

Research the breaking results of Indonesia iron ore processed by HPGR one time and the application of equipment;

The max. moisture content of materials processed by HPGR should be lower than 10% at home and abroad. Regarding to the Indonesia iron ore, its moisture content was higher than 10%. Whether was it suitable to be processed by HPGR? That was also the discussing topic in the test;

All processing parameters and technical indexes of HPGR used to process Indonesia iron ore.

Check the microscopic state of final products from HPGR.

(5)Test equipment

GM52-14 High pressure grinding roll trail machine;

φ200mm series of standard screen;

JA5102 electron balance;

101-1Ttype dryer;

500kg platform scale;

Small-scale hammer crusher for trail;

Electron microscope.

(6)Test parameter

Roll diameter : φ520mm

Roll width : 140mm

Roll rotary speed : 9-15rpm

Test pressure : 10Mpa

Original gap between rolls : 3mm

(7)Test result

Two kinds of ores: moisture content 3.8% and 11%. Two kinds of ores were processed separately by HPGR. The final products were flake material cake from the both kinds of material with different size. There was no power material;

Regarding to these flake final products, there were no big differences between high moisture ore and less moisture ore, no matter size or shape. Flake width was about 50mm, and thickness was less than 12mm. while there were differences between compactness and hardness. Flake with lower moisture was harder and more compact, compared with the high moisture material. Both flakes were hard and difficult to be crushed by finger.

Ore size was very fine after flake particles were crushed by small-scale trail hammer crusher. Its size was as following after screening:

☆particle size ≤1mm about 84%

☆particle size ≤2mm about 7%

☆particle size >3mm<5mm about 9%

Micro-cracking was found inside of ore products processed by high pressure grinding roll under the high-power microscope except the obvious macroscopic changes.

flake product

fine ore after crushing

interior micro-cracking

(8)Test result analysis

Ores with different size were discharged in the form of flake after processed by HPGR. Usually flake cakes were easily broken up. However, this Indonesia iron ore was very harder. We preliminarily analyzed there was viscous objects inside of ores since we did not test the composition of ores.

The test that Indonesia ores with over 10% moisture were processed by high pressure grinding roll machine was satisfied no matter size, capacity or the adaptability of HPRG equipment. Therefore, regarding to the problem of moisture content of HPGR feed, we could not lump under one head. We’d be better make conclusion after test based on the different materials. So, materials with the high moisture content could be processed without expensive dry process which could improve capacity greatly and save huge production capital.

Matrix of iron ore was dissociated even powder after processed by high pressure grinding roll. Ores with high grade of iron became fine particles. Some particles were proofed with a lot of interior micro-cracking after test.

(9)Test Conclusion

(a) The test proved that was right to select HPRG as the secondary crushing equipment for the special Indonesia iron ore. The user must gain huge economic and social benefits;

(b) High pressure grinding roll can process materials with moisture content over 10%. But it would be better to make decision after test for different materials.

(c) The best processing date of iron ore can’t be confirmed due to less material in the test. However, it was proved that high pressure grinding roll was completely suitable to process iron ore.

(d) Iron ore processed by HPGR had micro-cracking inside which could improve productivity of the following work and cut down energy-consumption effectively.

 

 

 

 

 

The briquette ball press is a ball-forming device for powdered materials such as coal powder, coke powder, carbon powder, etc. The efficiency of the equipment operation and the effect of molding directly affect the economic benefits in the production process. Even the products of the same type of briquetting press manufacturers, the results of different users are different, efficient and durable is our pursuit, is there any secret here?

As long as the following points are achieved, not only the ball-forming effect of the briquette ball press is guaranteed, but also the efficiency of use is greatly improved.

The first point we want to emphasize is the parameter setting of the ball press. After the equipment is shipped from the factory to the installation, it can be pressed directly on the machine. We also need a debugging process, such as the determination of the magnitude of the pressure, the gap size of the rolls, and so on. Only by setting up these parameters to the most reasonable by commissioning can we make a good foundation.

The second point we want to talk about is the material problem, which is also a topic that is not annoying. The material needs to be processed through certain processes during the process from crushing to loading. The humidity should be reasonable, the particle size should be reasonable, the adhesive should be added, and the impurities should be too much equipped with equipment such as iron remover. This is a prerequisite for the quality of the molding.

For the long-term use of the briquette ball press, the manufacturer of the briquetting press machine once again reminds the late management and maintenance work that it is very important. Develop appropriate rules and regulations to regularly inspect and maintain equipment. It is equally important to maintain the ball press for proper operation.

First, press the ball machine parts inspection: open the internal cleaning inspection, and check the bearing, spiral, triangle lining, nozzle and other parts of the wear and tear, replace the bearing grease; sweep into the ball machine to shoot down the dust, in the process of dismantling Should also pay attention to dust removal, dust should be prohibited from invading the moving parts during the inspection; remove the inspection cover of the reducer to check the wear and toothing status of the gear; remove the bearing cover of the roller shaft to check the wear of the bearing; check the foundation bolt, Is the safety bolt loose and tightened.

Second, the use of ball pressure machine equipment lubricants and inspection: the gear oil in the open gear box should invade the gear more than 60 mm; the gear reducer plus gear oil, the filling amount can enter the gear 60 mm; the roller bearing every three Open the bearing replacement grease or grease gun once a month.

Third, pressure ball machine cylinder, motor inspection: pay attention to check whether the ball screw installation screw is loose, oil quantity, motor current, bearing heat, triangle belt walking condition cylinder pressure. The oil pressure of the cylinder should be stopped for inspection. If there is temperature change, oil pressure and other reasons, the pressure change should be injected into the new oil or run back to the corrected oil pressure period to reach the specified working pressure change. If the oil pressure system leaks, it should stop immediately. , repair the oil spill and then start.

There are also some basic knowledge about productivity:

1. The pressed material composition, that is, the degree of adhesion is very important, which is related to the efficiency of the ball and has a certain influence on the productivity. Therefore, before the ball is pressed, the material is thoroughly dry-mixed to ensure smooth production.

2. The material of the pressure roller of the briquette press is very important. If only a simple material is used, it will wear out for a long time, which seriously affects the production efficiency. Therefore, it must be cautious on the selection of the key roller components.

3. The motor and reducer of the briquetting press equipment are also very important. It is necessary to see if these motors and reducers are produced by regular manufacturers, because good motors and reducers can also indirectly improve the briquetting press. Productivity.

The improvement of the production efficiency of the briquette ball press is related to many product elements. Only by ensuring the effective and normal operation of each link can the operation efficiency be gradually improved.

Mineral powder briquetting machine is widely used in metallurgy, chemical industry, refractory and other industries. It is mainly used for the pressure ball formation of non-hydrated materials that need to be smelted by the furnace, and belongs to the category of high pressure ball press equipment. Such as: quicklime powder, iron oxide powder, copper powder, chrome ore powder, lead and zinc scrap, aluminum bauxite, non-ferrous metal powder, refractory material, ceramic material, etc., through the high-strength high pressure to make the ball with higher capacity.

Mine powder briquetting machine application principle:

The main body of the ore powder briquetting machine is powered by a variable speed motor. Through the parallel shaft reducer, the gear coupling is transmitted to the main shaft, and the movable bearing housing is equipped with hydraulic devices behind. The screw feeding device is driven by the adjustable speed motor, and is rotated by the pulley and the worm reducer to force the pressed material into the feeding port. Through the pre-pressing spiral in the hopper, the material is forcedly pressed into the middle of the pair of rolls, and the unit forming pressure of the compressed material of the counter-rotating reverse running is changed from small to large, and the forming pressure reaches the maximum at the center line of the pair of rolls. After the material passes the line, the molding pressure rapidly becomes smaller, so that the material enters the off-ball state and the ball is smoothly removed.

Analysis of application of mineral powder briquetting machine for different materials

1, quicklime

The powder of quicklime is not easy to use directly. If it is not pressed by the quicklime ball press, it is particularly troublesome in handling and transportation due to its strong viscosity. Direct use in cement production may cause poor material transport and affect the normal production of cement. The pressing of the limestone ore briquetting machine becomes more convenient and efficient in use, and can be used not only for the production of cement but also for metallurgical production.

2, iron oxide powder

Iron oxide scale is a kind of waste product produced by the rolling mill in the process of rolling blanks. The iron content is high, and direct waste causes a large waste. However, if the iron oxide scale is directly poured into the steelmaking furnace, there will be a large amount of The dust will be taken away by the hot air. In order to reduce the loss of iron, it is generally recommended to use the mineral powder briquetting machine for processing and reuse, and the benefit is extremely high. The iron oxide scale has high iron content, and can be applied to the dust removing ash which can be added to the steel mill for pressing, so that the dust removing ash can be used again, and the scraping problem of the steel industry can be solved to some extent.

3, chrome ore powder

There are many classifications of chrome ore powder, which must be in the metallurgical industry, chromite, chrome ore and other materials. Chromite is mainly used to produce ferrochrome and metal chromium. On refractory materials, chromite is used to make chrome bricks, chrome-magnesia bricks and other special refractory materials. Since the powdery material cannot be directly produced by the furnace, it needs to be pressed by the ore powder briquetting machine. The pressed ball can be used for smelting of stainless steel, acid-resistant steel, special steel and special alloy.

4, bauxite

Alumina bauxite, also known as bauxite or bauxite, is mainly composed of alumina, which is a hydrated alumina containing impurities and is a soil-like mineral. Pressing with a mineral powder briquetting machine can press the bauxite powder into a ball-shaped block to achieve the equipment required for calcination or furnace smelting.

Analysis of application prospect of mineral powder briquetting machine

1. Environmental needs

According to the development needs of the metallurgical industry, in order to reduce the environmental protection pressure of the metallurgical industry, in order to reduce environmental damage and save resources and energy, industrial enterprises need to upgrade and optimize these materials on the one hand, and also need to improve the environment through some channels. Pollution. The mineral powder briquetting machine can compress waste and powder into balls, preventing environmental pollution caused by transportation or stacking.

2, resource needs

In the past, most of the powders in China’s metallurgical industry were abandoned or changed to other uses, resulting in great waste of resources. With the increasingly tight resources and energy, the utilization of powder in the metallurgical industry has received more and more attention. However, the powder cannot directly convert the smelting conversion income, so the ore powder briquetting machine is needed to press the ball into the ball to realize recycling and increase the efficiency.

3, product advantages

The mineral powder briquetting machine is a high-pressure ball press machine that does not need to add a binder. It is not only convenient to use, but also can save the company a large part of the cost of the binder, so this is also the increasingly more and more mineral powder briquetting machine. The reason why companies are loved.

The quality of the ore powder briquetting machine is reliable, multi-purpose and powerful, suitable for large, medium and small enterprises to establish a production line with a certain production scale. It is suitable for various moldings of industrial gasification, boiler type, cold pressing type focus, ignition type coal, civil type coal, civil metallurgy, refractory materials, medicine and other materials. After many years of industrial use and improvement, the mineral powder briquetting machine has the advantages of high pelleting rate, low power consumption, compact structure and easy inspection and debugging compared with other similar products.

The mineral powder briquetting machine mainly suppresses various kinds of iron powder, mineral powder, iron oxide scale, steel slag, refractory materials, etc. Any material that needs to be smelted with powder needs a mineral powder briquetting machine.

First, the three elements that need attention in the production of mineral powder briquetting machine:

1. Due to the different sizes of coal and ball, the required pressure is also different. It is necessary to select the molding machine with the molding pressure adjustable according to the economic situation.

2. The core mechanical equipment of the briquetting machine is the forming machine, and the key component that affects the working efficiency of the forming machine is the ball rolling roller. The blank of the ball rolling roller is divided into: integral forging and casting, the casting density is small, and the structure is rough. But it is more economical. Casting has high density, compact structure, good wear resistance, long service life, good processing technology of ball groove, suitable material types, and reliable operation. Most of them are used in medium and high pressure large-scale molding machines, but the cost is high. After the manufacturing process is improved, the current equipment replacement and maintenance is more convenient, reducing the difficulty of user maintenance.

3. The ball produced must be dried for sale or use. The current use is preferably a high-efficiency, easy-to-use vertical dryer or flap drying equipment.

When using the mineral powder briquetting machine, it is necessary to pay attention to the above problems in order to produce a good product when pressed.

Second, the installation instructions of the mineral powder briquetting machine:

Convenient installation is the characteristics of the briquetting machine, but the humanized design of different brand briquetting machines is still inconsistent. Many international famous brands provide a set of instant and effective installation, debugging and failure in addition to providing humanized products. Exclude the solution. Here, briefly put forward the common precautions and effective methods of troubleshooting in the actual project. Only the correct installation and proper maintenance can make the briquetting machine play its proper glory.

Before installing the briquetting machine, the pipeline should be laid in strict accordance with the electrical specifications, and the strong electric and weak electric signal lines should be isolated and worn to avoid interference. In the outdoor open environment, independent external lightning protection measures should be taken. The ball machine itself should also be well maintained. Grounding, to prevent static electricity accumulation, etc. affect the ball machine. When installing, properly connect the power cable, communication cable and video cable. When connecting, carefully refer to the installation instructions to confirm the communication method and the corresponding pin definition. Generally The equipment should be installed in the later stage of construction to avoid a large amount of dust on the construction site from invading the ball machine, directly affecting its use effect and life.

Third, the production and maintenance of mineral powder briquetting machine

Some of the basic problems limiting the shape, size and distribution of the ball and socket are obvious when designing the surface of the ore powder compactor. First of all, it must be recognized that the ball socket is never completely closed during the ball pressing process. Once the lower end of the ball is opened, the pressure at the upper end of the ball pushes out the lower part, which is important for demolding. However, as long as there is a tangent to the lower side of the stick at the lower end, the ball is easily destroyed under this pressure. This is one of the reasons why cylindrical balls cannot be made. The most advantageous shape is the drip type. As the length of the ball on the circumference of the wheel and the diameter of the wheel increase, the above effect is weakened. In particular, a small ore powder briquetting machine with a fixed nature theory needs to use the entire stick surface for the ball. The non-working platform between the elliptical ball sockets is large. The ball material is overpressured in these areas and determines the highest mechanical load of the ore powder briquetting machine, while the material in the ball socket is not compact. So all the pressure is used for forming and compacting. This effect imposes quite severe restrictions on the design of the wheel, and many people want to solve this problem. The left-hand wheel is horizontally moved by the eccentric transmission so that the lower side of the ball socket remains closed. The mineral powder briquetting machine is completed until the ball pressing process is completed. Then, the ball is released when the upper side of the ball is closed.

The diameter of the material used by the mineral powder briquetting press during ball pressing affects the working efficiency of the briquetting machine equipment, which has been confirmed to a large extent, so before the material of the mineral powder briquetting machine enters the inside of the briquetting machine We must check the materials to ensure the particle size and uniformity of the materials, so as to ensure that the components of the mineral powder briquetting machine are not damaged by materials of different sizes, and ultimately affect the working efficiency of the mineral powder briquetting machine.

During the working process of the mineral powder briquetting machine, if the particle size of the material is not uniform, the mechanical energy is completely converted into kinetic energy when the material is pressed against the roller, so that the mechanical energy of the ore powder briquetting machine is not completely used in the material. The extrusion efficiency of the briquetting machine will be reduced, so controlling the particle size and uniformity of the material is an important part. Otherwise, it may affect the working efficiency of the briquetting machine equipment and may also cause the ore powder pressure. Damage to the components of the block machine.