Jaw Crusher may have material return phenomenon when working: the material is not squeezed by the movable jaw and the fixed jaw, but is squeezed out of the inlet. This situation will not only reduce production efficiency, but may also cause physical harm to humans. Today, the editor of the Central Plains mainly shares the reasons and solutions for Jaw Crusher’s return of materials.

1. Reasons for Jaw Crusher’s return of materials

① Jaw Crusher’s own problems

The new Jaw Crusher parts do not match the dimensions of the drawings, such as the length and thickness of the jaw plate, the length of the bracket, the angle of the bracket, the size of the inner cavity of the frame, and other irregularities resulting in inferior products; the angle between the two jaws after long-term use The friction angle greater than twice prevents the material and the jaw plate from generating enough friction to overcome the upward component force of the crushing force, and the material is squeezed out under the action of the vertical upward force and slides towards the direction of the feed inlet .

Jaw crusher

②The material is unbalanced

The vertical force of the material to be crushed in the crushing cavity is easily unbalanced, and the phenomenon of material return is likely to occur under the action of the upward component of force.

③The width of the discharge opening is too large

For the Jaw Crusher of the same specification, the larger the width of the discharge opening, the more likely it is to return to the material. During the crushing process, the material is in direct contact with the jaw plate, causing friction. When the jaw plate wears more severely, the possibility of material return phenomenon is greater.

④The size of the material to be broken is too different

When the size of the material to be broken by the crusher varies greatly, the phenomenon of material return is easy to occur.

2. The solution of Jaw Crusher returning materials

①According to the material situation, use a crusher of appropriate specifications.

②When the jaw plate is worn out, the phenomenon of material return occurs, and the jaw plate should be repaired or replaced in time.

③When the particle size of the material is too different, screen it first; coarse Jaw Crusher is used for pre-processing, and then fine Jaw Crusher is used for finishing, which can ensure the processing requirements of the material.

④Add a wedge-shaped backing plate to the joint surface of the movable jaw and the movable jaw to reduce the angle between the two jaws, so that the angle between the two jaws is less than twice the friction angle, and the phenomenon of material return is eliminated.

⑤A protective plate can be welded above the Jaw Crusher inlet to prevent the material from flying out of the inlet and endangering the personal safety of the operator.

After the Jaw Crusher returns to the material, the operator must pay attention to safety, and follow the corresponding method to deal with it to make the equipment normal use. Luoyang Zhongyuan Mining Machine Manufacture Co., Ltd. specializes in the production and sales of Jaw Crusher, which can be professionally customized according to customer needs. Interested parties are welcome to come to consult.

Hammer crusher is abbreviated as hammer crusher, mainly used for stone crushing in building materials industry, highway and railway construction, and other industries using stone materials. This product is suitable for crushing various materials of medium-hardness and below, such as limestone, gypsum, bricks, slag, coal gangue, salt, chalk and other materials. It can directly crush materials with a large particle size of 750-1500mm to about 20mm. Jaw crusher is abbreviated as jaw crusher. It is widely used for coarse crushing of various minerals and rocks in various industries such as mining, building materials, highway, railway, water conservancy, chemical industry, etc., and coarse crushing of various ores and bulk materials. So, what is the difference between a jaw crusher and a hammer crusher? The editor of Zhongyuan has made a detailed summary for everyone, let’s take a look at it together.

1. The appearance and working principle are different

The two types of equipment can be distinguished from the appearance, and the working principle is also very different. The working mode of the jaw crusher is squeezing and crushing. The crushing cavity is composed of two jaw plates, a movable jaw and a static jaw, which simulates the two jaws of animals. The movement completes the crushing of materials, so it is also called “tiger mouth”;
The hammer crusher is mainly crushed by impact. After the equipment is started, the motor first drives the rotor to rotate at a high speed. The material enters the cavity of the hammer crusher, and is impacted by the rotating hammer, shearing, tearing, and mutual impact between the materials. The backing of the liner shattered.

Hammer crusher


2. Different broken materials

The jaw crusher can crush all kinds of soft and hard materials, such as: granite, quartz stone, diabase, river pebbles, iron ore, etc.
Hammer crushers are mainly used to crush ore with low hardness, and the compressive strength is generally less than 200Mpa, such as limestone, bluestone, coal gangue, etc. The hammer head wears severely when crushing hard materials. It may cost thousands of dollars to replace a set of hammer heads. For ordinary high-manganese steel hammer heads, some need to be replaced in 2 or 3 days, which is too costly.

3. Different discharge adjustment methods

The adjustment of the discharge particle size of the hammer crusher is achieved by replacing the bottom sieve plate;
There are many adjustment methods for jaw crusher, including three types: pad adjustment, wedge adjustment, and hydraulic cylinder.

4. The production line configuration is different

Generally speaking, the content of needles in the jaw crusher is relatively high, and it needs to be shaped with a counterattack, so we often see the configuration of jaw crusher + counterattack.
Hammer crushers are mainly used for industrial first-level crushers. They are formed at one time without the need for two-stage crushing and shaping. Therefore, they are often used in small and medium-sized production lines.

Jaw crusher

5. The application of sand and gravel aggregate line is different

Hammer crushers are rarely used in sand and gravel aggregate production lines. Although the process is simple, the yield is low, easy to be crushed, and there are many powdered materials. The finished aggregate may have microcracks, and the compressive strength is low, which affects the aggregate Quality also affects sales and prices, so it is often used as auxiliary sand making equipment.
Jaw crusher is often used as coarse crushing equipment in aggregate production line, followed by impact crusher or cone crusher for intermediate crushing, and then sand making machine for fine crushing and reshaping.

Hammer crushing and cone crushing are common rough crushing equipment, with large crushing ratio and simple structure, but the former works by impact energy, and the finished product has better grain shape. The limitation is that it is not suitable for hard rock material processing, while jaw crusher can handle a wide range of various types. Hard materials have a wider processing range, but the limitation is that the finished product is not good-looking. It needs to be reshaped by counter or impact breaking. In general, both have their own advantages. As for the specific equipment to choose, it still needs to be based on the actual situation. It depends on the usage and specific process requirements.

Commonly used crushing machinery classifications are: Jaw Crusher, impact crusher, hammer crusher, compound crusher, cone crusher, roller crusher, etc. They have different advantages and are common crushing equipment in coarse aggregate production lines. So, do you know the characteristics and differences of these crushers? The editor of Zhongyuan summarized the comparison of various types of crushers for everyone, let’s take a look at it together.

1. Jaw Crusher

Jaw Crusher is a widely used crushing equipment and one of the most primitive crushing machinery and equipment. There are many types of Jaw Crusher, among which the compound pendulum jaw crusher and its improved type are the most used, supporting the coarse crushing operation of the mine.
①Structure: It is composed of frame, eccentric shaft, large pulley, flywheel, movable jaw, side guard plate, toggle plate, toggle plate rear seat, clearance adjustment screw, return spring, fixed jaw plate and movable jaw plate, etc. The toggle plate also plays a role in insurance.
②Principle: The motor drives the belt and pulley, and the movable jaw moves up and down through the eccentric shaft. When the movable jaw rises, the angle between the toggle plate and the movable jaw becomes larger, thereby pushing the movable jaw plate to approach the fixed jaw plate, and the material is squeezed Multiple crushing such as, rubbing, and grinding; when the moving jaw moves downward, the angle between the toggle plate and the moving jaw becomes smaller, and the moving jaw plate leaves the fixed jaw plate under the action of the pull rod and spring, and the crushed material exits the lower mouth of the crushing cavity. Discharge, as the motor continuously rotates and breaks the mobile jaw for periodic crushing and discharging, realizing mass production.
③Advantages: The crushing cavity is deep and there is no dead zone, which improves the feeding capacity and output; the crushing ratio is large, suitable for coarse crushing; the gasket-type discharge opening adjustment device is stable and convenient, and the adjustment range is large, which increases the flexibility of the equipment; The lubrication system is safe and stable, the parts are easy to replace and replace, the maintenance workload is small; the structure is simple, the work is stable, and the investment cost is extremely low.

2. Impact crusher

The impact crusher was once selected as the aggregate production equipment by the highway project, and the commercial mixing station also stipulated that the material yard must be processed by the impact crusher. But this is the past tense, but I have to admit that the impact crusher is still a commonly used stone crusher, at least in the limestone crushing production line.
① Structure: According to the number of rotors, the impact crusher is divided into two types: single rotor and double rotor. The overall structure of the counterattack is simple, which is specifically composed of a frame, a transmission mechanism, a rotor, a hammer head, and a counterattack plate.
②Principle: Use the hammer on the high-speed rotating rotor to form a high-speed impact on the material fed into the crushing cavity, causing the material to be crushed. The crushed material is thrown to the counterattack plate at the other end of the crushing cavity at high speed along the tangent direction to complete it again Broken, and then rebound from the counterattack board to the hammer, and repeat the above process again. The material enters the first, second, and third counterattack chambers from large to small to repeatedly complete the crushing. In this process, the material is hit by the blower, impacted by the counterattack plate, and the materials collide with each other, continuously forming cracks, loosening and breaking. , After crushing to the required size, it is discharged from the discharge port.
③Advantages: wide range of applicable materials; strong flexibility in discharging granularity adjustment; simple structure, convenient maintenance, easy removal and replacement of wearing parts; high production efficiency and good product shape.

3.Cone crusher

Cone crusher is relatively late in research and development compared to other crushing equipment, but it is a well-designed equipment. There are many types of cone crushers. After continuous research and development and improvement, the adaptation of raw materials includes several categories: spring cone crusher, hydraulic cone crusher, hydraulic cone crusher is divided into single cylinder, multi-cylinder, compound cone crusher and so on.
①Structure: Different types of cone crushers have different structures. We take a multi-cylinder hydraulic cone crusher as an example to complete a brief introduction. The details include the frame part, the support sleeve part, the adjustment ring part, the movable cone part, the eccentric sleeve part, and the transmission part. It is combined with the seven components of the safety device. The main shaft is fixed, the motor drives the transmission shaft to rotate, and the transmission shaft drives the eccentric sleeve to rotate around the main shaft through a gear, and then the eccentric sleeve drives the cone to swing in an eccentric circle to achieve continuous crushing. stone.
② Principle: The motor drives the transmission shaft of the equipment through the pulley and the V-belt. The transmission shaft drives the eccentric sleeve to rotate around the main shaft through the bevel gears. On the mortar wall, the material is continuously squeezed, impacted and broken in the crushing cavity formed by the rolling mortar wall and the broken wall, and the broken material is discharged from the lower part.
③Advantages: It adopts the optimized structure of fixed main shaft and small spherical shaft, which is 5%-15% higher than the efficiency of the old spring cone crusher; the perfect combination design of crushing stroke, crushing speed and crushing cavity shape is better than the old spring cone crusher. The output is 35%-60% higher; the unique lamination crushing principle is adopted to form the crushing effect between the particles, the needle-like stones are reduced, and the grain size is more uniform; when there are hard objects such as iron that cannot be broken into the machine , The over-iron protection device will automatically release it, and then reset immediately.

The briquetting machine is a machine used to suppress materials that are difficult to form. It is widely used in metallurgy, chemical industry and other industries. Due to wear and tear or improper operation during work, some common failures may be caused and daily production may be affected. So, in daily use, what are the faults and maintenance methods of briquetting machine? The editor summarized these issues for everyone, let’s take a look.

1. The device restarts repeatedly

The repeated restart of briquetting machine is usually caused by the low power of the power supply, which is not enough to drive the block machine to work normally. When the infrared is turned on at night, the power of the camera will increase. If the power supply fails, the device will restart continuously.

Maintenance method: first use a multimeter to detect the power supply voltage of the block machine, and it must be measured when the load (block machine) is turned on to determine whether there is a power supply problem. Special attention should be paid to the fact that the power consumed by the outdoor briquetting machine when the heater is turned on and when the heater is not turned on is very different. When supplying power, the maximum power of the briquetting machine must be considered to ensure that the power supply equipment is sufficient to drive the briquetting machine to work normally.


2. Video scrolling

The video image of the briquetting machine scrolls continuously on the monitor. This phenomenon is mostly caused by the video synchronization problem.

Maintenance method: The briquetting machine mostly automatically synchronizes according to the phase in the AC power supply. The menu of the briquetting machine can be adjusted and the phase automatic synchronization function is selected. If the automatic synchronization fails due to the power phase, you can manually set the phase value in the briquetting machine menu to solve the synchronization problem.

3. Control garbled

The control of garbled codes is mostly caused by the uninterrupted transmission of garbled information due to interference on the data communication line. The interference mainly comes from the electromagnetic interference on the transmission path, and the optical transceiver may also have deviations during the photoelectric restoration.

Maintenance method: When the briquetting machine rotates irregularly, first check whether the central equipment has misoperation, and then check whether the briquetting machine menu has started the random scan mode.

4.The block rate decreases

The decrease in briquetting machine agglomeration rate may be due to insufficient material supply, which makes the briquetting machine no material to be pressed, and the hydraulic pressure is too small, so that the material is not completely compressed, and the roller skin is quenched soft and the block is deformed.

Maintenance method: insufficient material for briquetting machine should provide sufficient materials for briquetting machine; too small hydraulic pressure will make the materials incompletely pressurized, which can reduce the speed of the main engine and increase the working pressure of the system; low hardness of the roller skin will reduce the briquetting machine The forming pressure can be used to heat the surface of the roller skin or replace the roller skin; the deformation of the block will cause the shape of the material to be uneven, and the block should be replaced in time.

5.Does not fall off

The briquetting machine’s non-blocking is mainly caused by insufficient pressure value and low moisture content, and the briquetting machine material has a large moisture content, insufficient pressure strength of the block embryo, and rough surface of the block nest.

Maintenance method: appropriately increase the molding pressure of the briquetting machine, increase the water content of the raw material, and polish the block socket to ensure the smoothness of the block socket surface.

6.Block nest dislocation

The cause of the dislocation of the briquetting machine block socket may be the loosening of the adjusting sleeve bolts or the loosening of the roller skin and the shaft. After the briquetting machine has been used for a long time, there will be a small gap between the roller shafts of the counter rollers when rotating, resulting in the failure of the two pairs of rollers to form a match, which will cause the briquetting machine to displace up and down the nests, and after a period of use , Affected by the impact force and equipment vibration, causing the roller to deviate axially

Maintenance method: In general, if the briquetting machine has a radial misalignment of the block socket, it can be adjusted by the block slot radial alignment device. The long waist hole of the coupling is mainly used to achieve the fine adjustment of the block socket position by adjusting the screw. . The axial misalignment of the block socket can be achieved by twisting the adjustment screw on the lower beam to make the eccentric shaft rotate slightly, so that the adjustment block on it drives the bearing seat to translate, thereby forcing the roller sleeve to move axially to achieve the block groove alignment. Purpose, and at the same time, as long as the displacement of the adjustment block does not exceed the range, the block socket can be adjusted steplessly.

The above is the introduction of briquetting machine faults and maintenance methods, I hope it can be helpful to everyone. Only by understanding the faults and solutions that the briquetting machine will have, can we better use it in daily operations and bring the briquetting machine into full play. Luoyang Zhongyuan Mining Machine Manufacture Co., Ltd. specializes in the production and sales of briquetting machines, which can be professionally customized according to customer needs. Interested parties are welcome to come to consult.

Briquetting machine can improve the utilization rate of waste materials, and the pressed materials are energy-saving, environmentally friendly, and easy to transport. Everyone who uses a briquetting machine must think that it can be briquetted with good quality and high productivity, but this is actually related to the requirements, not only related to the quality of the briquetting machine. So, What affects the efficiency of briquetting machine? The editor made a detailed summary of these issues for everyone, let’s take a look together.

1. Briquetting machine equipment requirements


①The quality of Briquetting machine

First of all, the main factor that can affect the production efficiency of the briquetting machine is the performance of the briquetting machine. If you choose a briquetting machine equipment, if the quality of the equipment is not up to the standard, there will be some faults and problems frequently in operation, so naturally, it goes without saying that the model selection and other big ones will be futile. , And the amount of investment is also relatively large. Therefore, it is one of the key factors to ensure the production capacity of briquetting machine equipment that can operate with high efficiency without failure.

②Mechanical strength of Briquetting machine

The mechanical strength of the Briquetting machine is a prerequisite for material compression molding. What affects the mechanical strength of the briquetting machine is the pressure of the briquetting machine. The mechanical strength directly affects the advantages of the product in the subsequent industrial chain. Therefore, the influence of the mechanical strength and pressure of the briquetting machine is undoubtedly the most important.

High pressure briquetting machine

2. Requirements for suppressed materials


① Material moisture content

Moisture content has a direct and significant impact on the molding of briquetting machine compressed materials: when the material content rate is too low, the material compressed by the briquetting machine is prone to cracks; when the material moisture content is too high, it is easy to cause the product and the pressure roller to bond. As a result, the shape of the product is not complete, and the texture of the material pressed by the briquetting machine is soft, which affects the production efficiency of the briquetting machine, and the pressed finished product does not meet the hardness requirements of a qualified finished product. Users can control the amount of water added by mixing the materials and pre-dry the materials before pressing to control the moisture content of the materials.

② Material impurities

Excessive impurities in the material can affect the original performance of the material-affect the improvement of the material properties by the binder and other additives in the material. Impurities with higher hardness and larger particle size can even cause unnecessary damage to the briquetting machine. The user can decide whether to add a pre-screening process to reduce the impurities in the material according to the condition of the raw material. Impurities will affect the affinity between the particles of the material in the compression process, resulting in loose products and low molding effects.

③Material size

The particle size distribution of the material pressed by the briquetting machine must be reasonable, otherwise the large material particles will raise the surrounding small particles, which will form a “virtual block”. The virtual block is intact in appearance, and the mechanical strength of the briquetting machine is secretly insufficient. Uneven material particle size will also cause the production efficiency of the briquetting machine to decrease. It should be noted that when the material particles are under pressure in the body of the briquetting machine, an opposing force will be generated between each other. At this time, the binder can be used to offset it.

The above is the answer about What affects the efficiency of briquetting machine, I hope it can be helpful to everyone. The operators of the Briquetting machine must be specially trained before they can officially start their jobs. Luoyang Zhongyuan Mining Machine Manufacture Co., Ltd. produces and sells metal briquetting machines, which can be professionally customized according to customer needs. Interested parties are welcome to come to consult.

The ball press machine is mainly used for the molding and pressing of powdery materials, with high pressure, high ball formation rate and low power consumption. Manufacturers all hope to buy qualified and high-quality ball press equipment, which can improve production efficiency and reduce production and maintenance costs. So, do you know how to choose a high-quality ball press? How to judge the quality of the ball press? Our editor made a detailed summary for everyone today, let’s take a look at it together.

Judge the quality of ball press


1. Production efficiency

The ball press is bought to create benefits, so the production efficiency of the equipment is very important. If the equipment bought back does not even meet the basic efficiency requirements, then even if the price of the equipment is cheaper, it can only be bought back. It is a pit, so the production efficiency will directly determine the quality of the ball press.

2. Production quality

Quality is the life of an enterprise. In the product market, competition among enterprises is fierce. The essence of competition is quality competition. As a result, companies with good quality will eliminate those with poor quality. As a user, of course, I hope to buy a high-quality ball press. The quality is directly related to the quality of the ball press. The production quality of general equipment refers to the design and development, equipment selection, welding process, etc., these aspects Good, the quality will not be bad.

3. Device durability

To put it bluntly, the production and running time of ball press equipment is long. Long-term work will have higher production efficiency and better quality, which will create greater benefits.

High pressure briquetting machine

The correct choice of ball press method


1. Look at the manufacturer

For the ball press machine, why pay attention to the choice of its manufacturer? Because although big brand manufacturers cannot guarantee that every equipment product will never fail, what big brand manufacturers can guarantee is that they can deal with problems in time when you encounter problems in production, at least not as in the current market. Like some black-hearted merchants, once the product is sold, it is left alone. Therefore, choosing a regular brand manufacturer can better guarantee your later production process, and regular manufacturers have invested a lot in equipment research and development, after-sales, etc., so whether it is for the performance of the equipment or its later use , There will be greater protection.

2. Look at the equipment

It is not enough to just choose a regular manufacturer. At the same time, it is necessary to ensure that the quality and performance of the selected ball press machine are good. To do this, you can conduct a field inspection after selecting the manufacturer and bring the materials to test the machine. The performance of its performance, and a further understanding of its production materials and manufacturing process, if the performance of the ball press is not good or the quality is not very good, it will not be able to bring more benefits to production.

3. Look at the after-sales

For the use of the ball press, the perfection of the after-sales service is equally important. Take a simple example. If the ball press fails during production, but the user cannot solve it, there are manufacturers With the assistance of the company, the problem can be solved more quickly, thereby reducing the time for troubleshooting and making production proceed smoothly.

The above is the introduction of how to buy high-quality ball presses and the correct judgment method standards. I hope it can be helpful to everyone. Whether the quality of the ball press is up to standard or not is related to the actual benefits of production. The on-site inspection of the manufacturer can better understand the manufacturer’s scale, equipment and after-sales conditions, and can also better protect the purchase pressure The performance of the ball machine. Luoyang Zhongyuan Mining Machine Manufacture Co., Ltd. specializes in the production and development of belt conveyors, which can be customized according to customer needs. Interested parties are welcome to come to consult.

Dry powder briquetting machines are generally used for the compression molding of dry powdery materials, and most other types of briquetting machines generally require the addition of binders, additives, etc. for the assistance of pressing into balls. However, the dry powder briquetting machine can be directly pressed without additives and adhesives. It can not only be cold-pressed without adhesives, but also can be hot-pressed according to the requirements of the performance and purpose of the finished ball. Speaking of raw materials, must the dry powder not contain any moisture? Let’s talk about what kind of materials are not suitable for dry powder briquetting machine?

The answer is actually very simple. Since it is a dry powder briquetting machine, we can tell from the name of the briquetting machine. At this time, it is distinguished according to the material being pressed. Since it is a dry powder, if the user’s material contains moisture, it is recommended that you do not choose a dry powder briquetting machine. You should choose the most suitable briquetting machine according to the specific conditions of the material. And some of the special requirements for the refined oil of the press ball must be pressed with a dry powder briquetting machine.


Dry powder briquetting machine molding technology characteristics can be molded without adhesives

The technical feature of dry powder briquetting machine molding is that it can be molded without adhesives. Generally speaking, the briquetting machine requires the use of adhesives to complete the entire compaction of the material, but the dry powder briquetting machine is not the case. The characteristic of his molding technology is that no adhesive is used in the reproduction process. , Only relying on strong molding pressure can achieve batch molding of materials.

The binder-free molding method is widely used in the processing of dry powder. Although there is no external binder, it still uses the cohesive component of the dry powder itself to complete the molding work. In addition, some dry powder factories use hot pressing to make the dry powder produce a certain degree of plasticity, and then press it into a dry powder briquetting machine, a powerful briquetting machine and other equipment, and the rollers are rotated at a constant speed to compress the material. The pressure changes from small to large, and the molding pressure reaches the maximum at the center of the pair of rollers. After the material passes the line, the molding pressure decreases rapidly, and finally the material enters the ball-off state.


We mentioned above that the forming feature of the dry powder briquetting machine is that it can be pressed without additives and binders. In addition to using the adhesive properties contained in the dry powder raw material itself, more importantly, the dry powder briquetting machine has a strong pressure, through which the pressing can be completed more easily.

In summary, the technical characteristics of the dry powder briquetting machine that can be directly pressed without using adhesives are also closely related to the strong pressure of the dry powder briquetting machine itself. Moreover, some of the more special raw materials will have some chemical reactions after adding binders or additives, which will affect the properties of the powder and the characteristics of the finished product, so a dry powder briquetting machine is required to complete the pressing work.

With the development of industrial mechanization technology, briquette briquetting machines have also entered a white-hot state, and various types of briquette briquetting machines have caused hot sales in the market. The reason why briquette briquetting machine is recognized by many users is because of its performance and the economic benefits it creates. In the production process of the briquette machine, it is necessary to control the particle size, moisture, adhesive, etc., to have a good mixture of materials, and install the proportion to add auxiliary materials, so that the briquette briquette can be efficiently and safely produced. As for the issue of output, comprehensive consideration should be made. It is not the briquette briquetting machine that has a large output. It depends on the performance of the briquette briquetting machine and ensuring efficient and trouble-free operation. These factors are all briquette briquetting. The key factor for the high output of the machine.

Especially for the briquette production line, the correct selection of various supporting equipment is also the key. For example, the selection of supporting equipment such as vertical crushers, vertical dryers, and double-shaft mixers should also be based on the entire briquette production line. . In addition, the correct installation method and skilled operation equipment are the key to the output of briquette briquetting machine. Generally speaking, there are many factors that affect the high-efficiency production of ball presses. Users should not just screen out the model, but find out the reasons and eliminate them one by one, so that more benefits can be obtained. The briquetting machine manufacturers have summarized the following factors that will have an important impact on the pulverized coal forming process. Let’s take a closer look.

1. The forming characteristics of coal

The forming characteristics of coal is the most critical internal factor affecting the forming process of pulverized coal, especially the influence of the elasticity and plasticity of coal is more prominent. The higher the plasticity of the coal, the better the forming characteristics of its pulverized coal.

Young coals such as peat and lignite are rich in asphaltenes and humic acid substances with high plasticity, so they have good formability and ideal forming effects, and they can even be formed without binders. As the degree of coalification increases, the plasticity of coal decreases rapidly, and its forming properties gradually deteriorate. For coal with a high degree of coalification, it is generally necessary to add a binder to increase the plasticity of the coal before it can be formed.


2. Forming pressure

When the forming force is less than the crushing force, the mechanical strength of the briquette increases with the increase of the forming pressure. Different coal types have different crushing power. The forming pressure is closely related to factors such as coal type, material moisture and particle size composition, and binder type and quantity.

3. Material moisture

The main functions of the moisture in the material in the molding process are:

The presence of an appropriate amount of water can act as a lubricant, reduce the internal friction of the molding system, and improve the mechanical strength of the briquette. If there is too much water, the water layer on the surface of the particles will become thicker, which will affect the sufficient density of the particles, and will reduce the mechanical strength of the briquette. In addition, excessive moisture will easily cause cracks when the briquette is dried, which makes the briquette easy to break;

If a hydrophilic binder is used to make the brew, an appropriate amount of water will pre-wet the surface of the particles, which will help the particles to bond to each other. If the water is too much, the effect of the binder will be worse. The more suitable molding moisture is generally 10%~15%;

If the hydrophobic binder is used for molding, the moisture will reduce the effect of the binder, so the moisture of the material is generally controlled below 4% at this time.

In short, material moisture should be flexibly controlled according to the actual situation and controlled within a range.

fine ore after crushing

4. Material particle size and particle size composition

When determining the particle size and composition of the material, the following principles should be followed:

(1) Ensure that the arrangement of the material particles and shaped blocks is the closest to improve the mechanical strength of the coal. Practice has proved that smaller material particle size is conducive to the close arrangement of particles;

(2) When the binder molding process is adopted, the total gap between particles is minimized, so as to reduce the amount of binder and reduce the cost of briquette.

5. Dosage of bonding agent

Since most coal types have poor molding properties, the molding process using binders is more common. At this time, the amount of binder is not only a key influencing factor of briquette strength, but also has a very important impact on the production cost of briquette.

From the perspective of binder consolidation, increasing the amount of binder is beneficial to increase the strength of the briquette; from the perspective of the palladium formation process, increasing the amount of binder is not conducive to increasing the molding pressure and the strength of the briquette: In terms of mold stability, increasing the amount of binder is also not conducive to improving the strength of briquette. Therefore, it is generally necessary to determine a binder amount through experiments.

The main mixing objects of horizontal strong continuous mixer are: the mixing of a variety of solid materials and powders, and the high-precision mixing of these materials after adding a binder. It is widely used in metallurgy, building materials, refractory materials, ceramics, glass, plastics, compound fertilizers and other solids. At the same time, the horizontal strong continuous mixer is also particularly suitable for mixing viscous materials. However, the purpose of high-precision mixing is inseparable from its structure. .

Advantages of horizontal strong continuous mixer:

The horizontal strong continuous mixer consists of a frame, a barrel, a mixing tool, a rake tooth, a composite rubber lining, a transmission system and a control system. The transmission system is composed of a hydraulic coupling, a V-belt, a torque sensor, an explosion-proof motor, and a hydraulic Motor and other components.

The single-axis multi-cavity design is adopted, and the teeth are arranged in different geometric shapes. The materials are put into the front and rear movable curtains of the horizontal strong continuous mixer body to achieve cross and mixing between the materials. This horizontal strong continuous mixer is particularly suitable for mixing powder and powder, as well as mixing and mixing between powder and a small amount of liquid (binder), or mixing between materials with a large specific gravity.

Horizontal Strong Continuous Mixer

Structure principle:

The U-shaped long cylinder structure of the horizontal strong continuous mixer ensures that the mixture in the cylinder moves with less resistance. The positive and negative screws of the horizontal strong continuous mixer are installed on the same horizontal axis, resulting in low power and high efficiency. In a stirred environment, the horizontal strong continuous mixer usually consists of two or three layers. The outer spiral collects material from both sides to the center. The inner spiral transports the material from the center to the side, so that the material forms more eddy currents in the flow, thereby accelerating the mixing speed of the horizontal strong continuous mixer and improving the mixing uniformity.

When working, through the mixing tools arranged in the middle of the equipment, and 13 or 26 mixing rakes in different directions on the mixing tools, the materials entering the mixing equipment will be sprayed, sheared, scattered, and scattered strongly in the form of convection. Exchange, etc., so that the materials are fully blended in the barrel of the mixer and move to the discharge end of the mixing equipment. In this way of mixing, the materials to be mixed are not easy to agglomerate and agglomerate in the mixing equipment.

In the process of mechanical mixing and mixing of materials, there are mainly the following five methods:

(1) Shearing and mixing form shearing surfaces in the materials, so that the materials will be mixed.

(2) Convective mixing of many agglomerated material particles move from one part of the mixer to another for relative flow.

(3) Diffusion of the particles of the mixed mixture, moving around with a single particle as a unit, similar to the molecular diffusion process in gas and liquid. It is irregular movement, especially when the particulate material (dust) is vibrated or fluidized, the diffusion effect is extremely obvious.

Double-Shaft Mixer

(4) The impact mixing causes the individual material particles to disperse under the impact of the material and the wall shell.

(5) Deformation and crushing of particles of the crushed mixture.

Five mixing methods exist simultaneously in each mixing process, but the first three play a major role. Taking batch mixer as an example, the mixing process can be divided into three stages.

First, the particles in agglomerates from one part of the material in a layered form to penetrate and slip to another part, and convective mixing occurs.

Secondly, the particles of different ingredients gradually disperse across the newly formed interface and diffuse and mix.

Finally, under the action of its own weight and centrifugal force, particles of similar shape, size and density will gather in different parts of the mixer, which is called particle aggregation.

The first two effects are helpful for mixing, and the latter is a separation effect that hinders the uniform distribution of particles. These three stages happen at the same time in the mixer, but in different mixing time, the effect is different.

This video shows the operating status of the briquetting machine used on site one year after Russian users purchased our briquetting machine.