Landing stage by the table, the rotary shaft, the ring gear, the roller assembly, the hydraulic motor, the key, the bottom plate, the bottom of the base and uniformly distributed in the base of the drive hydraulic cylinder components. When four telescopic hydraulic cylinder piston rising, pushing the base and stage along the rail vertical rise. Rotational movement of the stage can be independently controlled by a hydraulic motor driving the ring gear to achieve. To effectively reduce the friction moment between the base and the table roller assembly arranged to ensure that the hydraulic motor can be driven relatively lightweight rotary stage.
After landing stage pump motor starts to work a double-pump, but the pump flow and low flow pumps are in the unloading state. When the stage rises, the solenoid is energized, lifting loop boost, the flow of hydraulic oil pump output were re-enter through the valve through the four pilot-operated check valve four cylinder rod chamber to produce thrust to overcome the weight of the stage friction rail and push the stage rises. Due to the larger size of the hydraulic cylinder, the stage rises slowly, in order to reduce the number of hydraulic components to ensure the reliability of the system, do not set the speed element to be taken by the oil pump and hydraulic cylinder direct guarantee size design. When the stage is stopped up or reaching the maximum stroke solenoid YA6 energized, valve is in the left position, the main circuit relief.
Landing stage due to the check valve lock, landing stage stop in locked position; when the landing stage down solenoid is energized, the system control loop boost, high-pressure oil into the pilot check valve control valve, the liquid check valve is opened, while the electricity, fuel tank valve connection, stage machinery and equipment declined own weight. The rate of decline it is set by the governor valve. Synchronization control: the same branch of the system of choice of four synchronous component model, each branch of the same input flow, can better ensure the synchronization of the rise of the four telescopic cylinders, synchronized decline.
Landing stage to make four cylinders produce the same thrust, the system uses four-way valve to isolate the four branches, and then use a pressure relief valve control, to ensure that each branch of the same set pressure.