The design of the hydraulic drive system is an important part of the overall lift. The design must meet all the technical requirements required for the use of the hydraulic lift platform. It also has good static and dynamic performance, high efficiency, safety and reliability, simple structure, good economy, and maintenance. Convenience. To this end, the principles of determining the parameters of the lifting freight elevator related to the hydraulic drive system must be clarified, and the overall design of the lifting platform must be considered to ensure that the machine, electricity, and fluid cooperate with each other to ensure the best overall performance of the elevator. According to the operating conditions of the hydraulic lifting platform, its hydraulic drive system must solve the following problems: (1) to ensure smooth operation, the weight of the lifting platform varies greatly, and the processing and installation errors of mechanical transmission parts and the off-load of the table are all It will cause a large change in the load of the hydraulic motor. The hydraulic system must be able to overcome the impact of the load change on the speed and ensure that the mechanism runs smoothly without shocks. (2) Because two hydraulic motors are used to drive the four oil cylinders, the hydraulic system It must ensure that the equipment has high synchronization control accuracy; (3) the inertia impact caused by the working load and the weight of the frame when the moving speed changes; (4) the weight loss phenomenon caused by the reverse load during the descending process must be controlled, especially Large equipment is extremely dangerous if it gets out of control.