Hard rock, as the name suggests, is rock with a hard texture, such as granite and basalt. For the crushing of this kind of hard rock, three types of jaw crusher, impact crusher and cone crusher can often be used. However, from the perspective of comparison of crushing efficiency, finished particle shape and wear rate, cone crusher It is more suitable for the crushing of hard rock. The specific knowledge about hard rock crushing is as follows:

1. Reasons for choosing cone crusher for hard rock crushing
1. Due to the high hardness of the hard rock, it will cause * wear on the equipment during crushing. The impact crusher adopts the impact crushing principle. The high-speed moving hammer is used to impact the material to break, the hammer will bear the brunt, and the frequency of replacement will be accelerated. , This will delay more production time. The choice of cone crusher is different. It uses the principle of lamination crushing, which uses the eccentric motion of the crushing wall to crush the material and *ly reduce the wear. Therefore, considering the wear rate alone, the cone crusher is better than the counterattack. The crusher is more suitable for hard rock crushing;

2. Although the grain shape of the hard rock product processed by the cone crusher may not be as good as the impact crusher, but it has fewer needle-like materials and the particle size of the finished product is relatively uniform. Furthermore, the crushing of the cone crusher The efficiency is high, so for enterprise users under general production requirements, it is better to choose the cone crusher;

3. In terms of safety, the cone crusher adopts a spring hydraulic safety device. When an unbreakable foreign body appears in the crushing chamber or the equipment is overloaded, the orifice can be automatically increased to discharge the foreign body and ensure its safety *. This is generally common Crusher does not have the function, so compared with other equipment, cone crusher is more suitable for hard rock crushing operations.

2, how does the cone crusher achieve the hard rock crushing operation
When the cone crusher is working, the rotation of the motor through the pulley or coupling, the transmission shaft and the cone part under the eccentric sleeve is forced to make a swinging movement around a fixed, forcing the crushing wall to approach and sometimes deviate and fixed in the adjustment sleeve The surface of the white wall is rolled, so that the ore will be subjected to continuous impact, extrusion and bending in the crushing cavity to achieve the crushing of the ore.

3. Process flow of hard rock crushing production line
In general, when considering the configuration of the hard rock crushing production line equipment, in addition to the core hard rock crushing machine, the cone crusher, some auxiliary crushing equipment, such as jaw crusher and sand making equipment, will be selected to complete Coarse crushing and shaping of hard rock materials. The specific crushing process is as follows: First, the hard rock is crushed by the preliminary crushing of the jaw crusher, and then transported to the cone crusher by the conveyor belt for processing and crushing, and then enters the sand making machine for reshaping. If required, it can also be equipped with a sand washing machine for cleaning and sieving finished sand and gravel.