Oil-gas combined vacuum oil pumping device and control method thereof

The invention belongs to the technical field of oil pumping devices, and particularly relates to an oil-gas combined vacuum oil pumping device and a control method thereof. The device comprises a vacuum pump, a vacuum tank in gas circuit communication with the vacuum pump and at least one vacuum oil pumping tank in gas circuit communication with the vacuum tank, the vacuum oil pumping tank is communicated with an oil path of a workpiece to be subjected to oil pumping and is communicated with a gas path of the pneumatic power source; an oil outlet of the vacuum oil pumping tank is communicated with an oil path of the oil liquid storage device; according to the vacuum oil pumping device, an oil-gas combined control system is adopted, the traditional mode that a hydraulic pump is adopted for direct pumping is changed, modern automatic control is achieved, and meanwhile the system is stable in oil pumping, high in reliability, sensitive in response and accurate in action. The vacuum tank is arranged between the v