大吨位全地面起重机泵控液压的介绍（Introduction of pump hydraulic control for large tonnage all terrain crane）.doc

大吨位全地面起重机泵控液压的介绍（Introduction of pump hydraulic control for large tonnage all terrain crane） Introduction of pump hydraulic control for large tonnage all terrain crane 2011-07-21 09:31, a??? Crane prior hydraulic system is controlled by the valve, opening size of control valve to control the flow of the hydraulic system, which controls the speed of movement mechanism the size of execution. The energy loss of the structure is large, and the heat generation of the system is high. I. Introduction the existing hydraulic system of crane is mostly valve control, that is to control the flow of hydraulic system by controlling the opening amount of hydraulic manifold valve, and thus control the speed of movement of actuator. The energy loss of the structure is large, and the heat generation of the system is high. This system uses the pump controlled hydraulic system, and ensure the coordination of engine and hydraulic system, effective use of the power of the engine, to avoid unnecessary energy consumption, saves energy and realizes the stepless regulation of the working mechanism. The micro system is excellent, the hydraulic system impact is greatly reduced, is conducive to the protection of the hydraulic system and the hydraulic components of the hydraulic components, the service life is prolonged, greatly improve the crane operation safety, reliability and efficiency. This system uses the electric control way, has realized the machine, the electricity, the fluid integration and the crane operation intellectualization truly. The system realizes the telescopic single cylinder bolt function with the expansion mechanism and the electrical system. Two, overview This system realizes the change of the movement speed of the actuator by controlling the displacement of the pump by the electro-hydraulic proportional pilot. The system is composed of closed circuit rotary circuit, main circuit of open circuit and auxiliary oil circuit. The rotary circuit adopts closed loop composed of