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Due to the large crushing ratio of the impact crusher, the wear of its wearing parts is particularly prominent, even bringing frequent downtime maintenance. Among them, the blow bar is the main operation component of counterattack breaking. The labor intensity in the application is relatively large. It directly impacts and touches the material, so the wear is difficult to avoid. Therefore, reducing the wear of the blow bar is the key to solving impact crusher wear.
The linear velocity is the working parameter that has the greatest impact on the blow bar wear. The linear velocity directly affects the impact energy exerted by the
blow bar on the material and the size of the crushing wall, and plays a decisive role in the particle size of the product. At too high a linear velocity, the material cannot enter the impact zone (or the depth of entry is very small), at which time it is violently worn with the end of the blow bar. Foreign research data shows that the abrasion of the blow bar is directly proportional to the first to second power of the linear velocity.
When the processing capacity is increased, the particle size of the product will become coarse, the crushing ratio will decrease, and the unit pure wear of the blow bar will also decrease. On the contrary, the unit pure wear of the blow bar will increase. Changing the size of the discharge gap can also change the thickness of the product size to a certain extent, so it also has a certain impact on the wear of the blow bar.
When the hardness of the material is too high, the moisture content is too high, the block size is too large to exceed the equipment's bearing scale, it will inevitably cause the plate blow bar to form different degrees of wear. If the feed particle size is too large, the impact energy to the blow bar will increase, the water content will be too high, and the water will chemically react with the blow bar to corrode the blow bar.
a. Since the unit pure wear of the counter-breaking blow bar is directly proportional to the first to second power of its linear velocity, it is very important to choose a reasonable linear velocity. In addition, it is necessary to select the appropriate type of impact blasting and operating parameters according to their actual production scale and requirements. On the premise of ensuring that the product size meets the requirements, the rotor rotation speed can be reduced as much as possible,
The material of the bar blow bar is usually high manganese steel, which is suitable for crushing medium-hardness materials, such as basalt, diabase, biotite, granite, etc. In practice, it must be fed according to the corresponding parameters, and the material characteristics Meet the requirements of the equipment.
After the blow bar is worn to a certain extent, it is also an effective method to surfacing cemented carbide on the worn surface. As can be seen from the figure, in the thickness direction of the blow bar, when the blow bar is worn to the point b´ Unit pure wear is minimal. Carbide surfacing welding when the blow bar is worn to near the b´ point can achieve the desired effect.
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