Hydraulic system of excavating machine

Abstract

The invention provides a hydraulic system of an excavating machine, belonging to the technical field of machinery and aiming to solving the problems of easy energy loss and energy waste in the existing small hydraulic system of the excavating machine. The hydraulic system of the excavating machine comprises a main oil circuit and an auxiliary oil circuit; the main oil circuit is connected with a bucket arm link and an auxiliary link of the excavating machine and is provided with a main oil pump; the auxiliary oil circuit is also connected with the bucket arm link and the auxiliary link, and provided with an auxiliary oil pump; a pressure shut-off link is connected on the auxiliary oil circuit in parallel; and the pressure shut-off link is capable of combining the main oil circuit with the auxiliary circuit, or unloading the auxiliary circuit according to the pressure power of the main oil pump. The hydraulic system of the excavating machine has advantages that the energy waste is effectively reduced and the resource is saved.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to an excavator, in particular to a hydraulic system of a small excavator. Background technique [0002] Small hydraulic excavator is a widely used small machine, which has the characteristics of high efficiency, comprehensive functions, good maneuverability, and friendly man-machine environment. As its main control device, the main control valve has the characteristics of multi-functional integration, fine flow distribution, and multiple compound action control compared with other construction machinery main valves. Generally, the throttling main valve of a small hydraulic excavator is driven by two or three hydraulic variable pumps. Through the control of the main valve, the excavator can achieve fast idling speed, fast leveling speed, fast digging speed, and energy-saving excavation. Good effect and other purposes. [0003] At present, the main control methods of the throttling...

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Problems solved by technology

When heavy loads or large obstacles are encountered during excavation, the required excavation force will increase accordingly, so the oil supply pressure of P2 pump and P3 pump will inevitably increase. However, since the set pressure of P3 pump is lower than that of P1 pump Therefore, the P3 pump may have been overflowed by the relief valve during excavation. At this time, the combination of the P2 pump and the P3 pump cannot increase the excavator's excavation efficiency, and the high oil pressure of the P3 pump overflows through the relief valve. flow also results in a loss of energy

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