The hydraulic lifting device controls the direction of motion of both cylinders. If the bench 1 is intended to rise, the reversing valve 7 is placed to the right position and the hydraulic oil from the pump 1 0 passes the check valve 9, the governor valve 8 and the reversing valve 7 to the stem cavity of the auxiliary cylinder 4 through the hydraulic control check valves 6 and 5 into the main cylinder 3, and the main cylinder 3 through the reversing valve 7, the secondary reversing valve 15 and the piston rod of the auxiliary cylinder 4 drives the counterweight 2 down, and the piston rod of the main cylinder 3 drives the table 1 up.
This process is equivalent to passing the potential energy of counterweight 2 to the working method, after which the large tonnage components on the ground are raised to the predetermined height and installed in place. The installation process is both simple, fast, and safe and reliable. In China, this technology from the end of the 1980s, has successfully applied the reliability and durability of the gas control system test. In addition, it is also necessary to test the computer control system of a variety of various different control algorithms and control strategies, to provide a basis for the actual improvement, in order to obtain the best improvement effect.
To this end, the large components is designed, which includes three parts: hydraulic synchronous lifting test bench. Hydraulic loading test bench and computer control system. This paper only describes the function of the hydraulic synchronous lifting test bench and its debugging test. When the lifting work piece rises, the hydraulic cylinder is required to provide driving force to it, that is, the hydraulic cylinder is required to output energy to the workbench; When the workbench carries the work piece down, the potential energy is released.
It is necessary to simulate the hydraulic synchronous lifting equipment before the actual works. Test includes: synchronous lifting oil cylinder, hydraulic pump station, jack and other loading tests and pressure withstand test, and sensing detection system.
