In sand and gravel plants, you can often see impact crushers and hammer crushers, but it seems that more businesses choose impact crushers. What is the reason for this? There are certain differences between the impact crusher and the hammer crusher in terms of technical structure, working principle, processing materials, and maintenance costs. The editor of General Mining Machine will make a detailed comparison on this, let’s take a look at the advantages of the impact crusher over the hammer crusher!
1. Technical structure
There are still some differences in the structure of impact crusher and hammer crusher. For the crushing cavity, the crushing cavity for counter-attack is relatively large, and the feed port is also relatively large. When the material enters the crushing cavity where the impact is broken from the feed port, the material is not only impacted by the hammer, but also repeated impact between the material and the impact plate, and between the material and the material, so the crushing effect is more sufficient. Better realize 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, it will produce less dust pollution, which has the advantage of environmental protection.
2. Working principle
There is a big difference between impact crusher and hammer crusher when crushing materials, which is caused by the difference of the plate hammer. Inside the impact crusher, the plate hammer greets the material from bottom to top to crush the material, and throws the material onto the upper impact plate, while the hammer crusher strikes and crushes the material in the direction in which it falls. , In the counterattack, the rotor rotates clockwise, and the blower faces the material from bottom to top, while in the hammer, the rotor rotates counterclockwise, and the hammer head strikes in the direction in which the material falls.
Both counterattack crushing and hammer crushing can realize the adjustment of the particle size of the finished product. Because the impact crusher has no grate sieve at its lower part, the adjustment of the product particle size is mainly controlled by adjusting the rotor speed or rotor diameter, adjusting the size of the distributor opening, 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. According to this situation, the impact crusher can more effectively process materials with large water content and avoid Clogging situation.
3. Handling materials
Because of the difference in technical structure and working principle, the impact crusher can not only handle softer materials, but also harder materials, while the hammer crusher can only handle materials with lower hardness. Because there is no grate bar at the bottom of the impact crusher, the product size is determined by the gap between the impact plate and the hammer head, so when the water content of the processed material is too large, it can effectively avoid the phenomenon of blocking the grate bar when crushing wet materials. The hammer crusher increases the possibility of clogging due to the factor of the bottom grate, so it cannot handle materials with high humidity. In comparison, the working range of the impact crusher is wider.
4. Maintenance cost
In the early purchase, 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 impact crusher plate hammer only appears on the side facing the material, and the metal utilization rate of the impact crusher plate hammer can be as high as 45%-48%. At the same time, the impact crusher frame part is a three-part structure, only need to open the rear casing of the crusher, you can replace the hammer, impact plate, liner and other maintenance operations, and the impact of the crusher parts 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 cost of overhaul and maintenance is relatively high. The broken rotor, bottom screen, grille, etc. may also be worn during work, and replacement is relatively complicated.
Through the above comparison, it can be known that if the material processed by the sand and gravel plant is harder or softer, the impact crusher is more inclined. On the contrary, the hammer crusher is selected. At the same time, it can also reduce the later operating cost of the equipment and improve its economy. benefit. In actual production, some merchants may choose hammer crushers due to different jobs, and the specific situation needs to be communicated with the merchant in detail.