In sand and gravel factories, impact crushers and hammer crushers are often seen, but it seems that more merchants choose impact crushers. What is the reason for this? There are certain differences between impact crushers and hammer crushers in terms of technical structure, working principle, material handling, and maintenance costs. The general mining machine editor will compare this in detail to see what the advantages of impact crushers are over hammer crushers!
1. Technical structure
There are still some differences between the impact crusher and the hammer crusher. For the crushing cavity, the crushing cavity of the impact crusher is relatively large, and the feeding port is also relatively large. When the material enters the crushing cavity of the impact crusher from the feeding port, the material is not only subjected to the impact of the hammer, but also has repeated impact between the material and the impact plate and between the material and the material, so the crushing effect is more sufficient. Better realization of the production of bulk materials. In comparison, the crushing cavity of the hammer crusher is smaller, and the sealing performance is better than that of the impact crusher. When the material is crushed and processed, less dust pollution will be generated, which will have the advantage of environmental protection.
2. Working principle
There is a big difference between the impact crusher and the hammer crusher in crushing materials, which is caused by the difference of their plate hammers. Inside the impact crusher, the plate hammer greets the material from bottom to top for crushing, and throws the material to the upper impact plate, while the hammer crusher hits and crushes the material in the direction in which it falls. , In the interior of the impact crusher, the rotor runs clockwise, and the plate hammer faces the material from bottom to top, while in the interior of the hammer crusher, the rotor runs counterclockwise, and the hammer head strikes in the direction of the falling material.
Both the impact crusher and the hammer crusher can adjust the particle size of the finished product. Because there is no grate screen in the lower part of the impact crusher, the adjustment of the product particle size is mainly controlled by adjusting the rotor speed or rotor diameter, adjusting the opening size of the distributor, and adjusting the gap of the grinding chamber. For the hammer crusher, the adjustment of the particle size of the finished product can be controlled by adjusting the size of the sieve plate gap. blocked situation.
3. Handling materials
Due to the difference in technical structure and working principle, impact crusher can not only handle softer materials, but also materials with higher hardness, while hammer crusher can only handle materials with lower hardness. Because there are no grate bars at the bottom of the impact crusher, the particle size of the product is determined by the gap between the impact plate and the hammer, so when the water content of the material is too large, it can effectively avoid the phenomenon of clogging the grate bars when crushing wet materials. Hammer crusher increases the possibility of blockage due to the grate bottom, so it cannot handle materials with high humidity. In contrast, the working range of the impact crusher is wider.
4. Maintenance cost
When buying in the early stage, the price of counterattack is generally higher than the price of hammer. However, due to the difference in structure and work between impact crusher and hammer crusher, there will be certain differences in later maintenance.
The wear of the blow hammer of the impact crusher only appears on the side facing the material, and the metal utilization rate of the blow hammer of the impact crusher can be as high as 45%-48%. At the same time, the frame part of the impact crusher is a three-part structure. It is only necessary to open the rear casing of the crusher to carry out inspection and maintenance operations such as replacing the plate hammer, impact plate and lining plate. The interchangeability is strong, and the variety of wearing parts is small, which is convenient for the procurement and management of spare parts.
The hammer crusher has more than 100 hammer heads. It takes a lot of time and manpower to replace a set of hammer heads, and the repair and maintenance costs are high. Hammered rotors, bottom sieve plates, grilles, etc. may also be worn during operation, and replacement is relatively complicated.
Through the above comparison, it can be known that if the material processed by the sand and gravel plant has high hardness or soft material, it is more inclined to the impact crusher. Otherwise, the hammer crusher can be selected, which can also reduce the later operation cost of the equipment and improve its economy. benefit. In actual production, there will also be merchants who choose hammer crushers due to different work, and the specific situation needs to be communicated with the merchants in detail.