Post-observation gate-always grasp the sand-making dynamics. The impact crusher is equipped with a new observation door, which can keep abreast of the sand-making trends, facilitate timely observation of the sand-making situation, and facilitate the maintenance of related components. The observation door of impact crusher should be well managed at ordinary times to avoid the danger of material rushing out. The observation door should be stopped regularly to observe the internal wear of impact crusher. Vortex system-reduce dust overflow. The impact crusher adopts a vortex crushing cavity, and the structure of the vortex crushing cavity is an annular space composed of an upper cylinder and a lower cylinder. The impeller rotates at a high speed in the vortex crushing cavity, and the material can also be left in the vortex crushing cavity to form a material lining, so that the dust particles generated in the sand making process will not flow out, and the dust pollution in the sand making process is greatly reduced. Two ways of making sand-making sand is more sufficient. Impact crusher adopts two sand making methods: stone beating and stone beating. Beating stones is the use of self-striking between stones, which is more energy-saving. Stone-beating is to use the counter-attack of the liner to break the stone, and the crushing effect is better. The impact crusher adopts dual-purpose bulk tray, which is convenient for the conversion between the two sand making methods. Safety alarm system-make production safer. The impact crusher adopts advanced safety alarm system, which improves the production safety. When there is an abnormal fault in the sand making process, the alarm system will sound to remind the operator to avoid a bigger safety accident. The existence of safety alarm system also prolongs the life of the whole machine.