The structure of the hydraulic cylinder has a variety of structures, and there are many classification methods: according to the exercise method, it can be divided into a straight line movement and rotary swing type; according to the actual situation of liquid pressure, it can Forms can be divided into piston, plunger, multi -level telescopic sleeve type, gear rack type, etc.; according to the installation form, it can be divided into trolley, earrings, bottom, hinge shafts, etc.