Static pressure unloading cavity hydraulic control system

The utility model provides a static pressure unloading cavity hydraulic control system which is characterized in that the oil inlet of an oil pump driven by a motor is communicated with an oil tank. The oil outlet of the oil pump is connected with a filter. The high pressure oil pumped by the oil pump is led into two pipes after being filtrated; wherein, one pipe is connected with a main oil pipe, and the other pipe is connected with a lateral oil pipe. The main oil pipe is communicated with an unloading oil cavity under a guide rail plate through a proportional pressure-reducing valve. A pressure sensor is arranged on an oil pipe which is communicated with the unloading oil cavity. The lateral oil pipe is connected with a pressure gauge and an overflow valve. The system is simple and easy to be operated, can effectively control the bearing capacity of the unloading oil cavity, reduce the wearing between friction pairs, guarantee that a sliding table can run on the guide rail stably, improve the feeding preci