The jaw plate is divided into a fixed jaw plate and a movable jaw plate, which are the wear-resistant parts of the jaw crusher. When the jaw crusher is running, the movable jaw is attached to the movable jaw plate to make a compound pendulum movement, forming an angle with the fixed jaw plate to squeeze the stone. Therefore, the jaw plate is a more easily damaged accessory in the jaw crusher. Replacement of jaw failure means downtime or even the entire production line for maintenance. Frequent replacement of the jaws will directly affect the production efficiency and economic benefits of the enterprise. Therefore, understanding the factors that affect its wear and extending its life is a concern for many users.
- Reasons for the wear of the jaw plate
1）The contact between the jaw plate and the machine surface is not stable;
2）The speed of the eccentric shaft is too fast, and the crushed materials are too late to be removed, causing the crushing cavity to be blocked and the jaws to wear;
3) The nature of the material has changed, but the crusher has not been adjusted in time;
4) The included angle between the movable jaw and the fixed jaw is too large, exceeding the normal range;
5) The strength, wear resistance and resistance of the jaw plate are not good.
- Solution
1) When installing the jaw plate, it must be installed and fixed tightly so that it is in smooth contact with the surface of the machine;
2）A layer of material with better plasticity can be placed between the jaw plate and the surface of the machine;
3）Each batch of materials entering the crusher must be randomly inspected. Once a relatively large change in the nature of the material is found, the parameters of the crusher must be changed in time to match the incoming material;
4）The jaw plate must be made of materials with high hardness, wear resistance and strong resistance, and high manganese steel is commonly used;
5） Cement companies with ore crushing production line technology can exchange the same type of worn jaws for coarse mine crushing and fine cement crushing, and the worn jaws can be repaired by surfacing.
- Suggestions to improve the service life of the jaws
1）Choose a well-designed jaw plate
Reasonable structure design helps to improve the life of the jaw plate. For small and medium-sized jaws, the jaws can be designed in a symmetrical shape up and down, so that they can be turned around when the lower part is severely worn. For large jaw crushers, the jaw plates can be designed to be symmetrical to each other, so that the wear blocks can be exchanged conveniently.
2）The assembly method of the jaw plate should be correct
When assembling the jaw plate, it is necessary to firmly fix the jaw plate on the movable and fixed jaws, and use copper, lead, zinc, etc. to maintain the same parallelism between the movable and fixed jaws. In order to avoid the relative sliding between the jaw plate and the movable and fixed jaws when the jaw is working, the wear or breakage of the jaw can be avoided.
3）Precautions for actual operation
①When the mounting bolts of the jaw plate are loosened by vibration, which causes the jaw plate to wear out, or even fall off or break, it is necessary to conduct a specific analysis of the reasons for the loosening and fall off during the working process of the crushing plate. It is unscientific to tighten the fastening bolts of the board.
②Install springs on the fixing bolts to improve the anti-loosening and vibration reduction ability of the jaw plate fixing bolts, extend the service life of the jaw plate, and improve the production efficiency and economic benefits of the crusher.