Crusher is an indispensable equipment in the process of crushing ore, among which jaw crusher is particularly important. The crusher can crush more than 200 kinds of soft and hard stones below 1200mm, and is widely used in large-diameter stone processing and large-scale stone factories. 1. Working principle of jaw crusher The jaw crusher drives the belt and pulley through the motor, and the eccentric shaft makes the movable jaw move up and down. When the movable jaw rises, the angle between the toggle plate and the movable jaw becomes larger, thereby pushing the movable jaw plate and the fixed jaw plate to approach. It is crushed or split to achieve the purpose of crushing. When the movable jaw goes down, the angle between the toggle plate and the movable jaw becomes smaller, and the movable jaw plate leaves the fixed jaw plate under the action of the pull rod and spring. The lower opening of the cavity is discharged. With the continuous rotation of the motor, the crusher jaws periodically crush and discharge materials to achieve batch production. picture 2. Performance advantages of jaw crusher 1. The unique deep V cavity design, combined with the large stroke, suitable rotational speed and flywheel inertia formed by the large inclination bracket, ensures efficient kinematic performance and higher crushing ratio, and the processing capacity is higher than that of the traditional jaw type. Crusher increased by more than 50%. 2. The frame with modular, non-welded structure avoids the problem of welding stress concentration, improves the ability of the equipment to withstand impact loads, and enhances the durability and stability of the machine. 3. The integrated motor base reduces the installation space of the crusher and saves the installation time. It is more convenient and quick to adjust the screw to adjust the tension of the V-belt; the appearance of the whole machine is more compact and beautiful. 4. The overall bearing box structure is adopted to ensure complete coordination with the frame, avoiding additional load on the bearing box, and the bearing life is longer and more reliable. 5. The hydraulic wedge-type discharge port adjustment mechanism is adopted to adjust the size of the discharge port steplessly, which makes the adjustment of the discharge port simple, safe and fast, saving labor. 6. When the equipment is working, materials that exceed its crushing capacity may enter. These materials will have adverse effects on the operation of the equipment, and even damage the equipment. At this time, the bracket will break by itself to protect the equipment from damage.

The first is the performance of the crusher. A crusher equipment with outstanding quality and performance is very important to customers. It not only saves customers a lot of maintenance time, but also saves customers a lot of money for maintenance. Take a look at the advantages of the equipment produced by our factory, I will come here together! 1. Compared with other types of crushers, this series of crushers have a large crushing ratio, no requirements for the moisture content of the crushed materials, no sticking and no blocking, less over-crushing, less noise, less vibration, less dust, and low energy consumption. , Small footprint, simple and convenient maintenance and so on. 2. Equipped with hydraulic automatic retreat device, which can effectively prevent the damage of iron blocks to the toothed rollers and the harm of wood blocks and flexible objects to the normal operation of the toothed rollers. 3. Equipped with an intelligent removal device, which can automatically remove the adhering materials on the wall of the crusher cavity by using the working condition interval. 4. The use of mechanical, electrical, hydraulic and other multiple protection devices and interlocking devices effectively protects the motor, the crusher and the entire system. 5. With the advantages of high efficiency, energy saving and environmental protection, this product has become the first choice for thermal power plants to replace imported crushing equipment. Applicable materials It is suitable for crushing brittle materials below medium and low hardness, such as bituminous coal, anthracite, lignite and coal gangue. It can also be used for sinter, coke, slag, shale and limestone.

In the process of mine construction, the crusher is an indispensable equipment. It can increase the output of raw ore, reduce the loss of mechanical equipment, save the cost of the enterprise on the basis of ensuring the output, and improve the economic benefit. However, the wear of wear-resistant parts is a problem that many mining production enterprises are more concerned about. This paper briefly analyzes the main points of the wear failure phenomenon of the wear-resistant parts of the crusher. 01 Wear mechanism of metal materials 1.1 Adhesive wear Adhesive wear is often present on machined parts. Adhesive wear means that in the process of sliding friction, the contact surface of the friction pair is partially adhered to the metal, and the adhesion is easily damaged in the subsequent relative sliding, so that the metal particles fall off the surface of the part or the surface of the part is scratched. When the interacting surfaces are in contact, the contact occurs only on a few individual tiny protrusions, and due to the small contact surface, the stress occurring on the contact area is large, resulting in plastic deformation of the contact surface, and the surface film layer is destroyed by the metal flow , so that the metal atoms are in direct contact to produce bonding, forming a cold solder joint, that is, causing adhesion. During the relative sliding process, the adhesion is damaged, and the metal particles fall off the surface of the part. Adhesive wear is usually divided into three stages: break-in, steady wear and severe wear. 1.2 Abrasive wear General abrasive wear refers to the contact movement of harder abrasives with the friction surface, which causes the loss of surface material. In industrial production, abrasive wear will increase the consumption of materials, and it seems that the wear failure caused by abrasive wear accounts for more than half of the proportion. 1.3 Surface fatigue wear Surface fatigue wear is when the two contact surfaces are rolling, sliding or rolling-sliding compound motion due to periodic contact load or alternating stress acting on the microscopic volume of the friction surface, resulting in cracks on the surface and sub-surface due to fatigue, and ultimately material loss. Surface fatigue wear cracks occur on the surface and subsurface and extend parallel or perpendicular to the surface, eventually causing the surface material to flake off in the form of pitting or pimple-shaped spalling pits. 1.4 Corrosion wear During the friction process, chemical reactions or electrochemical reactions occur between the friction pairs or on the surfaces of the friction pairs and the environmental medium to form corrosion products. The wear caused by the formation and shedding of corrosion products is corrosion wear. Corrosion wear can be divided into chemical corrosion wear and electrochemical corrosion wear. The most important chemical corrosion wear is oxidative wear. When the friction pair is in relative motion, the convex part is in frictional contact with the other side to produce plastic deformation, and the oxygen in the air enters into the plastic deformation layer to form an oxide film. However, due to the low strength of the oxide film, when the second bump occurs, it peels off and exposes a new surface, the new surface is oxidized to form an oxide film, and then peels off. After this repetition, the surface of the mechanical part gradually wears, and finally the part fails. 02The working principle of the crusher The jaw crusher has various structures, but the working principle is the same, that is, the periodic motion of the movable jaw plate is used to destroy the material. When the movable jaw plate swings around the suspension mandrel to the fixed jaw plate, the material between the two jaw plates will be crushed and split. In the initial stage, the pressure is small, so that the volume of the material becomes smaller, and the materials are squeezed against each other; when the pressure exceeds the maximum bearing limit of the material, it will rupture. On the contrary, when the movable jaw leaves the fixed jaw and swings in the opposite direction, the material moves downward by gravity. Due to each cyclic movement of the movable jaw plate, the material is squeezed and discharged downward. After several cycles, the crushed materials are discharged out of the machine through the discharge port. 03 Main factors affecting wear 3.1 Shape of the part Jaws with different structures and shapes have different mechanical properties and internal metallographic structures during heat treatment, and also have great differences in wear resistance. The thicker the jaw, the harder it is to harden, and the worse the wear resistance. Since the internal wear resistance of the jaw plate is lower than that of the surface, the thicker jaw plate can only improve this problem through effective casting and heat treatment processes, but this method is difficult to greatly improve the wear resistance of the jaw plate. The best way is to optimize the structure design of the jaw plate without changing the strength of the jaw plate, which can not only improve the utilization rate of the jaw plate, but also reduce the influence of the structure on the heat treatment performance and prevent the wear resistance of the jaw plate from being reduced. 3.2 Material selection of parts Generally, the harder the jaw, the higher the wear resistance. In order to improve the wear resistance of the jaw plate, it is necessary to increase the hardness, but as the hardness increases, the impact toughness of the jaw plate will decrease. So how to balance the hardness and impact toughness of the jaw plate is very important to improve the wear resistance of the jaw plate. At present, the commonly used materials for wear-resistant parts of crushers are high manganese steel, high chromium cast iron and low carbon alloy steel. High manganese steel has excellent toughness, excellent manufacturability and low price, it can quickly produce work hardening under impact or contact stress, the work hardening index is five to seven times higher than other materials, and the wear resistance is greatly improved . However, if the impact force is insufficient or the contact stress is small during use, rapid work hardening cannot be achieved, and the wear resistance of high manganese steel cannot be fully exerted. High chromium cast iron has good wear resistance, but low toughness and easy brittle fracture. Low-carbon alloy steel is an alloy structural steel containing various elements such as chromium and molybdenum. It has the characteristics of high strength and excellent toughness. The matrix structure is martensite, bainite and the composite structure of the two. 3.3 Structure of the crusher Optimizing the structure of the crusher can make the movable jaw plate have excellent mobility, which can reduce wear and improve processing capacity. Reasonable design of the crushing cavity can reduce the occurrence of blockage and slow down the wear rate of the movable jaw. Therefore, when designing the structure of the crusher, it is necessary to pay attention to the design of the crushing cavity. The shape and size of the crushing cavity must meet certain requirements. First of all, the material entering the crushing cavity in a unit time cannot be more than the material that can be crushed and discharged, otherwise the machine will be overloaded and blocked; secondly, the materials must be evenly distributed in the crushing cavity to ensure the stable operation of the machine; To improve efficiency and prevent clogging and excessive crushing, it is necessary to ensure that the crushed materials can be smoothly discharged from the crushing cavity; finally, to ensure that the fineness and shape of the product are cubic, a parallel area should be designed under the crushing cavity of the crushing type crusher. 3.4 Influence of crusher feeding situation The feeding situation includes: feeding particle size, hardness and feeding method of the crusher. The feeding particle size and hardness of the material are closely related to whether the crusher has accumulated material and the impact impulse received by the jaw plate hitting the material. Collision impulse has an effect. The weight of the jaw plate remains unchanged, the collision impulse of the jaw plate is proportional to the material quality and drop, and the collision impulse is closely related to the wear resistance of the jaw plate. In addition, the water content of the material should not be too high, otherwise the material will easily stick to a ball, resulting in accumulation of material, speeding up the wear of the jaw plate and reducing the service life. In the process of mine construction, it is inevitable to encounter the problem of wear failure. At this time, it is necessary to study the wear mechanism, and constantly find ways to reduce wear, so as to minimize the loss of the enterprise.

In sand and gravel factories, impact crushers and hammer crushers are often seen, but it seems that more merchants choose impact crushers. What is the reason for this? There are certain differences between impact crushers and hammer crushers in terms of technical structure, working principle, material handling, and maintenance costs. The general mining machine editor will compare this in detail to see what the advantages of impact crushers are over hammer crushers! 1. Technical structure There are still some differences between the impact crusher and the hammer crusher. For the crushing cavity, the crushing cavity of the impact crusher is relatively large, and the feeding port is also relatively large. When the material enters the crushing cavity of the impact crusher from the feeding port, the material is not only subjected to the impact of the hammer, but also has repeated impact between the material and the impact plate and between the material and the material, so the crushing effect is more sufficient. Better realization of the production of bulk materials. In comparison, the crushing cavity of the hammer crusher is smaller, and the sealing performance is better than that of the impact crusher. When the material is crushed and processed, less dust pollution will be generated, which will have the advantage of environmental protection. 2. Working principle There is a big difference between the impact crusher and the hammer crusher in crushing materials, which is caused by the difference of their plate hammers. Inside the impact crusher, the plate hammer greets the material from bottom to top for crushing, and throws the material to the upper impact plate, while the hammer crusher hits and crushes the material in the direction in which it falls. , In the interior of the impact crusher, the rotor runs clockwise, and the plate hammer faces the material from bottom to top, while in the interior of the hammer crusher, the rotor runs counterclockwise, and the hammer head strikes in the direction of the falling material. Both the impact crusher and the hammer crusher can adjust the particle size of the finished product. Because there is no grate screen in the lower part of the impact crusher, the adjustment of the product particle size is mainly controlled by adjusting the rotor speed or rotor diameter, adjusting the opening size of the distributor, and adjusting the gap of the grinding chamber. For the hammer crusher, the adjustment of the particle size of the finished product can be controlled by adjusting the size of the sieve plate gap. blocked situation. 3. Handling materials Due to the difference in technical structure and working principle, impact crusher can not only handle softer materials, but also materials with higher hardness, while hammer crusher can only handle materials with lower hardness. Because there are no grate bars at the bottom of the impact crusher, the particle size of the product is determined by the gap between the impact plate and the hammer, so when the water content of the material is too large, it can effectively avoid the phenomenon of clogging the grate bars when crushing wet materials. Hammer crusher increases the possibility of blockage due to the grate bottom, so it cannot handle materials with high humidity. In contrast, the working range of the impact crusher is wider. 4. Maintenance cost When buying in the early stage, the price of counterattack is generally higher than the price of hammer. However, due to the difference in structure and work between impact crusher and hammer crusher, there will be certain differences in later maintenance. The wear of the blow hammer of the impact crusher only appears on the side facing the material, and the metal utilization rate of the blow hammer of the impact crusher can be as high as 45%-48%. At the same time, the frame part of the impact crusher is a three-part structure. It is only necessary to open the rear casing of the crusher to carry out inspection and maintenance operations such as replacing the plate hammer, impact plate and lining plate. The interchangeability is strong, and the variety of wearing parts is small, which is convenient for the procurement and management of spare parts. The hammer crusher has more than 100 hammer heads. It takes a lot of time and manpower to replace a set of hammer heads, and the repair and maintenance costs are high. Hammered rotors, bottom sieve plates, grilles, etc. may also be worn during operation, and replacement is relatively complicated. Through the above comparison, it can be known that if the material processed by the sand and gravel plant has high hardness or soft material, it is more inclined to the impact crusher. Otherwise, the hammer crusher can be selected, which can also reduce the later operation cost of the equipment and improve its economy. benefit. In actual production, there will also be merchants who choose hammer crushers due to different work, and the specific situation needs to be communicated with the merchants in detail.

1. Check whether the mechanism has a warehouse door before starting. It is forbidden to open the door during the operation of the machine to prevent danger. 2. The crusher must be empty to start and will be in normal operation before it is under the purpose of production. 3. According to the requirements of the particle size of the input material, the assembly has caused equipment damage and low output. 4. In the event of abnormal interruption, stop checking, solve the problem, and then use it for production. 5. Constantly add lubricant and rotate bearing parts.

The lump ore falls into the upper crushing chamber from the feed hopper and onto the upper throwing disc. With the help of the centrifugal force of the throwing disc, the material is thrown to the inner wall of the cylinder, and violently collides with the counterattack plate installed on the inner wall. At the same time, the materials collide with each other. It is broken or a large number of hairline cracks are generated, and then the material enters the conical rotor cavity and falls in a spiral shape in the conical space. After punching and extrusion, the cracked ore is further broken. Due to the inclination between the conical rotor and the lining plate, the smaller materials are forced to migrate downward, and the grading and crushing can be automatically realized from large to small. The material is hit by the hammer in the conical rotor cavity, the high-speed running block material collides with the counterattack plate again, and the material flow collides with each other, so that the material is crushed by the blowing, impacting, shearing and extrusion surfaces, thereby improving the crushing efficiency.