Machine-made sand is an artificially selected raw material. The material is uniform and stable. The mineral composition and chemical composition are consistent with the raw material, and it is not as complicated as natural sand. The sand is clean, free of mud and other harmful impurities, and has stable performance.
The first generation of sand making machine (also called rod mill sand making machine)
The first generation of sand making machine was drum type, grinding, falling down and other methods. The sand making effect is not good and the efficiency is low. It can only crush the stone into a sand making machine that meets the particle size for construction. Sand making machine in the experimental stage. The improved hammer crusher is mainly for the crushing of grain, legume stalks and weed materials. So it has basically withdrawn from the historical stage of the sand making machine.
The second generation sand making machine
This is the impact sand making machine we are talking about, why don’t we call it the second generation sand making machine, because it uses an impact method to make sand, with high sand making efficiency and good sand making effect. This is currently the mainstream sand making machine. machine. The working principle of the impact crusher is the principle of rock-on-rock. Let the stones collide with the stones accelerated by the impeller in the process of natural falling, so as to achieve the purpose of crushing! When the accelerated stones collide with the naturally falling stones, a vortex will be formed, and the return process will proceed again. Two times of crushing, so the wear of the machine's counterattack plate during operation is very small.
The second generation sand making machine (impact sand making machine) is widely used for fine crushing and coarse grinding of metal and non-metallic ores, cement, refractory materials, abrasives, glass raw materials, construction aggregates, artificial sand making and various metallurgical slags Operation, especially for medium-hard, extra-hard and abrasive materials such as silicon carbide, emery, sintered bauxite, magnesia, etc., is more superior than other types of crushers. It can be used with hydraulic protection collar breaker to process various metallurgical slags.
It is suitable for construction sand and sand and gravel for road construction. The second generation sand making machine (impact sand making machine) has simple structure, low cost, stable operation, high efficiency and energy saving. The material self-lining in the impeller and vortex crushing cavity greatly reduces the cost of wearing parts and the maintenance workload, which is effective The problem of "iron pollution" in the process of crushing glass and other raw materials and the problem of "steel stuck" in the process of crushing steel slag are solved, and the ingenious internal air flow self-circulation eliminates dust dispersion.
The third generation sand making machine
It is what we call counterattack sand making machine, or counterattack sand making machine. The working principle of the third generation sand making machine (impact sand making machine) is that the stone material falls from the upper channel of the impact sand making machine into the high-speed rotating turntable, and under the action of high-speed centrifugal force, it divides with another part around the turntable in an umbrella manner. The impact block produces high-speed impact and high-density crushing. After the stones hit each other, they will form a vortex motion between the turntable and the casing, resulting in multiple mutual hits, frictions, crushing, and crushing as required. The granularity.
The third-generation sand making machine is widely used in stone production lines in hydropower, highway and other industries. The crushed materials are cubic particles, which are suitable for crushing medium-hard materials, such as limestone crushing in cement plants. It has the advantages of large production capacity and small discharge particle size. It can handle materials with a side length of 100-500 mm or less, and its compressive strength is as high as 350 MPa.
Because the impact sand making machine and the counterattack sand making machine appeared at different times, we call them the second generation sand making machine and the third generation sand making machine. In fact, their working principles are different. Sand making equipment with very high sand efficiency. At present, some manufacturers say that the fourth-generation sand making machine, the fifth-generation sand making machine, the sixth-generation sand making machine, the seventh-generation sand making machine, etc., are actually not so many sand making machines. There are only sand making machines: impact sand making machine, third generation sand making machine, rod mill sand making machine and river pebble sand making machine.
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