The hydraulic pump is the power component of the hydraulic system. It is driven by the engine or the motor, and the oil is inhaled from the hydraulic tank, the pressure oil is discharged and sent to the actuator.As the heart of the hydraulic system, the hydraulic pump provides power for the hydraulic system, and its performance plays a key role in the normal operation of the system.
Hydraulic pump according to the structure is divided into gear pump, piston pump, vane pump and screw pump. In the working process of the excavator hydraulic system, the hydraulic oil is inhaled by the working pump from the bottom of the tank through the oil filter, and the hydraulic oil with a certain pressure is output from the oil pump into a set of parallel distribution valves. Through the handle - a pilot valve -the working valve group to achieve the corresponding action, the system through the total safety valve on the total oil circuit to limit the total pressure of the whole system, each group of working oil circuit of the safety valve plays the role of overload protection and oil supply for the corresponding oil circuit. Its working principle is composed of some basic circuit and auxiliary circuit, they include working circuit, pressure limiting circuit, unloading circuit, buffer circuit, throttle speed regulation and throttle speed limiting circuit, walking speed limiting circuit and pilot valve control circuit. Its components are mainly composed of work pump, fuel pump, pilot control valve, distribution valve, safety valve, boom oil cylinder, boom oil cylinder, bucket oil cylinder, oil tank and related pipelines. The hydraulic excavator used the gear pump as the main pump in the 1970s. Later, because the gear pump pressure is low and can not change the flow rate, the performance of the excavator is affected. At present, in addition to the small excavator and the excavating loader, it is no longer used in the medium-sized excavator.In the 1980s, China introduced German hydraulic excavator manufacturing technology, and began to widely use A8V series inclined shaft variable piston pump in excavators. In the introduction of excavator manufacturing technology, also introduced the manufacturing and connecting of hydraulic parts, so that the production and use of A8V variable pump has become mature.
The above is about the relevant introduction of the hydraulic system, elephant fluid power company has a variety of brands and models of hydraulic valves, hydraulic pumps, hydraulic fittings, etc., welcome to inquire ~
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