Analysis of the reason why the hammer of the impact crusher does not wear

Loosening, fracture, abrasion, etc. are the main forms of failure of the impact hammer of the impact crusher, which *ly shortens the service life of the hammer and increases the consumption of components. In order to save production costs and improve efficiency, it is necessary for users of counterattack crushers to understand the cause of excessive consumption of the plate hammer.

1. Poor manufacturing quality of plate hammer bolts
Some counterattack manufacturers have backward production processes, and the method of fixing the hammer is still bolted, that is, the hammer is fixed to the hammer seat of the rotor by bolts. This fixing method easily makes the bolts fixed on the surface of the hammer subject to material. Shear force applied. If coupled with the poor manufacturing quality of the bolt, it will often loosen and break, which will easily cause the plate hammer to loosen or break and shorten the service life. The wedge is fixed by using a wedge to plug into the corresponding slot between the hammer and the rotor to tighten it. This is currently a better way of fixing the hammer, and it is also used in various countries.

2. Improper selection of plate hammer material
There are three common materials for counterattack breakers: high manganese steel, alloy materials and high chromium cast iron.
High manganese steel has a history of more than 100 years. It is characterized by good toughness, high strength, good workmanship, and a certain degree of hardness. Under the action of large impact or contact stress, the surface layer of high manganese steel will rapidly produce severe Work hardening, *ly improving surface hardness and wear resistance. However, in actual use, the impact force or contact stress is often insufficient, and the surface cannot be rapidly worked hardened, and the wear resistance cannot be fully exerted. Alloy steel materials have the advantages of high toughness, low cost, and good abrasion resistance. However, in practical applications, due to the complicated process and relatively small storage capacity, it cannot meet the market demand.

3. Poor manufacturing quality of plate hammer
In the current market, the quality of counter-attacks has been uneven, and some small manufacturers have recharged in the production process, but users can't see the difference in appearance. Xiaobian once received a message from a friend saying that when the hammer was damaged, from the fracture, pores and even voids were visible, and the organization was coarse. This caused problems such as poor casting and heat treatment quality.

4. Improper selection of the hammer structure
There are many types of plate hammer structure. There are two types of working surface: wide and narrow. The wide and effective wear is large. There are also single-headed and double-headed work. There are single-sided and double-sided work. One wear surface, two heads have two wear surfaces, and two heads have four wear surfaces on both sides. Under the same material conditions, the hammer with large effective wear and many wear surfaces has a long natural life.

5.Material does not meet crushing requirements
1) The impact crusher can generally handle granite, basalt, limestone and other materials with a particle size of not more than 350 mm and crushing compressive strength of not more than 320 MPa. If the operator does not strictly follow the crushing requirements, the material is too hard or the particle size is too large, which will cause the plate hammer to be consumed too quickly.
2) If there are too many sticky materials, a large amount of material will adhere to the hammer, resulting in overloading the hammer, resulting in excessive consumption of the hammer.