Hydraulic screw motor-mechanical linear actuator

The invention discloses a hydraulic screw motor-mechanical linear actuator which comprises a shell cavity, an end supporting bearing, a main screw, a plurality of auxiliary screws, a nut type sleeve, a piston rod, a sealing ring, a buffer gasket and the like. During working, high-pressure hydraulic oil is conveyed through an external hydraulic loop to drive the main screw and the auxiliary screw to rotate, namely a hydraulic screw motor is formed inside to drive the mechanical device to move, and the stretching and moving speed of the piston rod can be controlled by changing the direction and the flow of the hydraulic loop. The one-way hydraulic cylinder is reasonable and compact in structure, and ingeniously avoids the problem of asymmetry of oil ways on the two sides in the telescopic process of a traditional one-way hydraulic cylinder piston and the defects that a pure electric cylinder needs to be additionally provided with a motor for driving, a speed reduction device and the like, the size is limited, a