The company has independently developed and produced the hydraulic opening and adjustment system for double roll crusher, four roll crusher and pcfk impact crusher. The hydraulic principle is used to make the main crusher roll have the function of overload protection and concession, so that the machine has the feature of iron overload protection. Main advantages: it realizes the operation of human and machine interface, and the equipment is simple, safe and efficient. It improves the automation level, reduces noise, reduces maintenance personnel, improves user efficiency, reduces procurement costs, and improves the competitiveness of crusher products.