Device and method for preventing overload of forward and reverse loading of servo actuator cylinder

The invention belongs to the aircraft ground test technology, and particularly relates to a device and a method for preventing overload of forward and reverse loading of a servo actuator cylinder in the aircraft ground test. The device for preventing overload of loading comprises a force sensor, an actuator cylinder block, a sensor feedback circuit, a command controller, a servo valve, a rod cavity overflow valve, a rod cavity one-way valve, a rodless cavity overflow valve and a rodless cavity one-way valve. When loading is required to be applied in the test, the command controller sends out a corresponding loading command, the valve core of a servo valve is actuated, the right station of the servo valve enters the working state, and high pressure oil enters the rodless cavity of a hydraulic cylinder to drive a piston to realize loading; when lugging is required to be applied in the test, the command controller also sends out a corresponding loading command, the left station of the servo valve enters the working state, and oil liquid enters a rod cavity to realize lugging. By applying the device and the method, the overload of forward and reverse loading of the servo actuator cylinder in the aircraft ground test is effectively prevented, the safety of test pieces is protected, the test quality is improved, and the test technique level in the prior art is increased.