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In the working process of jaw crusher, jaw plates (tooth plates) are the parts that directly contact the raw material. In the crushing process, the crushing teeth on the jaw plates are continuously squeezed, ground, and impacted by the materials. The huge impact load and severe abrasion have caused the jaw plates to become the most wearable part in the crushing process of jaw crusher.
Once the jaw plates wear reaches a certain level, power consumption will increase. The failure and replacement of jaw plates means downtime of jaw crusher or even the entire production line. Frequent replacement of the jaw plates will directly affect the production efficiency and economic benefits of the enterprise.
Therefore, understanding the factors that affect the wear of the jaw plates and prolonging its service life is a problem that many customers are very concerned about.
The contact between the jaw plate and the machine surface is not stable;
The speed of the eccentric shaft is too fast, and the crushed materials cannot be discharged timely, causing the crushing cavity to be blocked and the jaw plates to wear;
The material has changed, but the crusher has not been adjusted in time;
The angle between the movable jaw plate and the fixed jaw plate is too large, exceeding the normal range;
The strength, wear resistance and resistance of the jaw plate are not good.
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 jaw crusher;
2. A layer of material with better plasticity can be placed between the jaw plate and the surface of the jaw crusher;
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. Worn jaw plates can be repaired by surfacing.
The hardness of the material has an important influence on the wear of the jaw plates. Under same conditions, materials with high hardness are easier to press into the surface of the base body of jaw plate than materials with low hardness, resulting in furrow wear.
The wear resistance of the jaw plate material directly determines the service life of the jaw plate. Although high manganese steel is partly replaced by other steels under low and medium stress impact abrasive wear conditions, it still occupies an important position in wear-resistant materials due to its low production process conditions and a wide range of sources of raw materials.
The trajectory of the moving jaw has an important influence on the performance of the jaw crusher. The production capacity, specific power consumption, steel consumption (jaw plate wear) and the quality of the crushed product of the jaw crusher are directly related to the movement trajectory.
Taking the compound pendulum jaw crusher as an example, the jaw plates usually have the following wear characteristics after production: the wear of the fixed jaw plate mainly occurs at the lower part of the jaw plate, and the wear at the discharge port is the largest while the movable jaw wears the most in the middle.
In addition, nip angle and tooth shape also have a certain influence on the wear of the jaw plates.
The design and material selection of jaw plates are the basic factors that affect the service life of jaw plates.
When the jaw plates are designed:
The peaks and valleys of the movable and fixed jaws should be opposite to each other to ensure that the jaw plates can apply a certain bending stress in addition to the corresponding squeezing force on the material during work, which can effectively to improve the crushing capacity of the jaw crusher.
For small and medium-scaled jaw crushers, in order to extend the service life of the jaw plate, the jaw plate can be designed in a symmetrical shape, so that it can be turned around when the lower part is severely worn.
For large scaled jaw crushers, the jaw plates can be designed to several blocks that symmetrical to each other, so that the wear blocks can be easily exchanged and the service life of the jaw plates can be extended.
When selecting materials for jaw plate:
ZGMn13 can be used as the main material for jaw plates. This kind of manganese steel has strong toughness. Although its hardness is reduced, it has the characteristics of cold work hardening. In the working process of jaw crusher, the squeezing force the jaw plate bears makes it continuously squeezed and hardened during the working process, realize the hardening while being worn until it is worn out to exceed the use limit before being scrapped. In addition, other factors such as cost must be considered comprehensively when selecting materials.
The assembly of the jaw plate has a great influence on its service life. When assembling the jaw plate, it is necessary to firmly fix the jaw plate on the movable and fixed jaws, and use copper sheet, 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 moving and fixed jaws when the jaw crusher is working, the jaw plate will be worn or broken, thereby reducing the service life of the jaw plate of the jaw crusher.
During the working process of jaw crusher, the material is in direct contact with the jaw plates, and the jaw plates bear huge crushing force, especially for some materials with higher hardness. The strong force will cause the installation bolts of the jaw plates to be vibrated and loosen, thereby aggravating the wear of the jaw plates, or even falling off or breaking.
When this happens, it is impossible to solve the problem only by tightening the fastening bolts of the jaw plates before the jaw crusher is turned on. It is necessary to deal with the cause of the loosening and falling off during the working process of the jaw crusher. Make specific analysis and adopt practical methods to solve it. For example, springs can be installed on the fixing bolts to improve the anti-loosening and vibration reduction ability of the fixing bolts of jaw plates, extend the service life of the jaw plate, and improve the production efficiency and economic benefits of the jaw crusher.
In addition, customers should purchase jaw plates from a regular manufacturer to ensure the quality of the jaw plates. In the production process of jaw crushers, attentions should be paid to the operation of the equipment, and troubles should be eliminated in time to ensure the good operation of the equipment.
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