The jaw crusher is a crushing machine that everyone is very familiar with. We also wrote an article about the jaw crusher plates last time, but in the last comment, someone asked if there was a detailed introduction to the jaw plate of the crusher. so we wrote this article, this is an article about the jaw plate of the crusher, I hope it can help everyone.
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The role of crusher jaw plate plate
The jaw plate of the crusher is the main wear-resistant part of the jaw crusher. It is divided into the movable jaw plate and the static jaw plate. According to the different models of the jaw crusher, the jaw plate also has various sizes.
The jaw crusher is composed of the movable jaw and the fixed jaw. The movable jaw and the fixed jaw are very easy to be damaged because they often bear huge crushing force and friction on the material. The wear-resistant lining board is installed on the surface of the machine, which is also called a broken board.
When the machine is working normally, the wear speeds of the upper and lower parts of the crushing plate are different. The lower part wears faster than the upper part. When the machine is working, the crushing plate is in direct contact with the material and bears huge crushing force and material wear. The service life of the crushing plate is directly related to the work efficiency and production cost of the crusher, so it is very important to extend the service life of the jaw plate of the crusher.
In the production of the crusher, the biggest consumption is the jaw plate of the crusher, so it is very important when choosing, and we must grasp the quality. It can also be said that the quality of a crusher is fundamentally the quality of the jaw plate of the crusher.
Some performance characteristics of crusher jaw plate
- Manganese steel alloy is selected, with high wear resistance and long service life
- High hardness using cold work hardening technology
- Water toughening treatment to avoid deformation during use and deteriorate performance
- Strictly inspected before leaving the factory to ensure the quality is guaranteed
Material comparison of several crusher jaw plate
High manganese steel
High manganese steel is a traditional material for crusher jaw plate, with good toughness and good bending hardening ability. However, due to the structure of the current crusher, the opening angle of the jaw plate of the crusher is too large, the material is easy to slip and cause wear, and the surface hardness of the jaw plate of the crusher is low, so the jaw plate wears quickly.
Medium manganese steel
High manganese steel has low initial hardness and low yield stress performance, so in order to improve the service life of crusher jaw plate, medium manganese steel is developed. Medium manganese steel has a good effect in practical application, and the price of medium manganese steel is similar to that of high manganese steel, so for small output crushers, it is a good idea to use medium manganese steel as the jaw plate of the crusher. s Choice.
High chromium cast iron and high manganese steel composite
Although high-chromium cast iron is an excellent wear-resistant material for the jaw plate, its toughness is poor. When it is impacted or squeezed by the material, it will easily break or bend. not good. Therefore, high-chromium cast iron and high-manganese steel are used together to make composite jaws, but although this improves the service life of the crusher jaw plate, its production cost and difficulty increase.
low alloy cast steel
Low-alloy cast steel is a kind of wear-resistant material commonly used at present, mainly because its hardness and toughness are relatively good, it can resist the impact and extrusion of materials, and has good wear resistance. At the same time, the low alloy cast steel can also be adjusted by heat treatment to change the hardness and toughness to adapt to the requirements of different working conditions.
Reasons and solutions for the loosening of the crusher jaw plate
Possible faults:
The fixing bolts of the jaw plate of the crusher are loose;
The crusher jaw plate liner falls off;
The fixed iron is not fixed;
Solution:
Stop the operation, check the fixing screws and tighten them;
Overhaul the gasket, and re-pad if it is found to be off;
Re-tighten the fixing iron.
What happens when the crusher jaw plate is replaced without material
Possible cause: The humidity of the material is too high
When the machine encounters materials with high humidity, or when the material to be crushed is mixed with soil, it is very easy to cause the machine to get stuck, so that the material cannot be discharged.
Solution:
This should be checked from the material, the material to be crushed should be screened, the material that does not meet the requirements should be screened out, and the material that meets the requirements should be thrown into the crusher for crushing.
Possible reasons: too much feeding at one time or feeding too fast
When the crusher is working, if the material is fed too quickly or unevenly, it will easily lead to too much material at the discharge port of the crusher, resulting in blockage.
Solution:
You can use a special feeder for feeding. The feeder is specially used to put materials into the machine. Under normal working conditions, the feeding is uniform and uniform, so the use of the feeder can solve the problem of too much feeding at one time. Or the feeding speed is too fast.
What are the common fracture causes of crusher jaw plate?
The reason for the machine itself:
The size of the discharge port of the crusher does not meet the specifications. When a large material enters the crusher, the load of the jaw plate increases, which may lead to breakage; it is also related to the bracket and bracket pad. The quality of the pad is unqualified. When there is a large impact force in production and protection is required, the bracket cannot play its due self-break protection function.
Human factors:
When the tension rod spring in the machine is used for a period of time, the tension fails and the new spring device is not replaced in time; the assembly of the eccentric shaft, bearing, tightening bushing and movable jaw is unqualified, and the movable jaw is displaced during the working process, and Collision and fracture with the inner wall of the fuselage; uneven feeding, if the material is biased in the crushing cavity or the inclination angle of the blanking is too large, the jaw plate will directly collide with the material, increasing the wear strength.
Causes and maintenance methods of crusher jaw plate damage
The main reason for the wear of the jaw plate is that the material slides relative to the jaw plate, which wears the jaw plate, and the jaw plate repeatedly squeezes the material, and the jaw plate deforms many times, resulting in metal fatigue and wear. The specific process is as follows:
When the machine is working, the material enters the crushing cavity, the movable jaw is driven by the eccentric shaft to approach the fixed jaw, the two jaw plates slide with the material in a short distance, and the material wears the jaw plate.
During the movement of the movable jaw plate and the fixed jaw plate, the material is repeatedly squeezed, and the material is squeezed back and forth between the two jaw plates, which may cause cracks in the jaw plate, resulting in damage to the jaw plate.
After the continuous movement of the connection between the jaws, wear is produced, resulting in damage to the jaws.
Maintenance method:
First of all, the material of the jaw plate of the crusher should choose high-performance materials with high toughness, friction resistance and extrusion resistance; secondly, the crusher should avoid other debris from entering the crusher when feeding, and it should be timely after each work. Clean up the crusher; when using it, it must be operated according to the specified operating time, and the machine cannot be allowed to run continuously for a long time.
Some suggestions for the use of jaws
- During the working process of the crusher, the material can only be fed after the machine is running normally.
- The newly installed jaw plate of the crusher must be fixed and installed, and the connection with the machine must be lubricated.
- The material to be crushed should be added to the crusher evenly and at a uniform speed, and do not add too much at one time.
- Under normal circumstances, the temperature of the bearing should not exceed 35 degrees Celsius, and the maximum temperature should not exceed 70 degrees Celsius. If it exceeds 70 degrees Celsius, stop immediately and check the fault.
- Stop feeding before shutting down, and shut down the machine after all the materials in the crusher are discharged.
- It can improve the structure of the jaw plate of the crusher, reduce the relative sliding between the material and the tooth plate, and reduce friction.
- It is necessary to choose a jaw plate with high hardness for crushing.
That’s it for the introduction of the crusher jaw plate, have you already understood it? If you have any questions, you can leave a comment below our article. We will read each of your comments carefully and answer your questions. At the same time, there are many other excellent ones on our website. Article, you are welcome to continue browsing other articles on our website.