... -sales: R&D and consulting support;4.After-sale: skills training & spare parts support.Impact crusher, ... fire-proof materials, ceramics, glass and other industries, for crushing medium hardness ore, such as limestone, quicklime, chamotte ... bar area, they are crushed due to the high-speed impact of the blow bar and are ... be shot back to the blow bar again for the third crush. This process repeats until the ...