Hydraulic system for loader

Abstract

The invention discloses a hydraulic system of a loader. The hydraulic system comprises a hydraulic pump, a low pressure sealed oil tank, a high pressure energy accumulator, a medium pressure energy accumulator and a hydraulic control unit, wherein the hydraulic control unit is integrated with a first one-way valve, a second one-way valve, a third one-way valve, a first safety valve, a second safety valve, a third safety valve, a first pressure sensor, a second pressure sensor, a first magnetic exchange valve, a second magnetic exchange valve, a third magnetic exchange valve, a first magnetic proportional exchange valve, a second magnetic proportional exchange valve, a third magnetic proportional exchange valve and a fourth magnetic proportional exchange valve. The hydraulic system for the loader provided by the invention utilizes the high pressure energy accumulator and the medium pressure energy accumulator to store kinetic energy in the braking process of loader and excess energy of the loader in low load conditions and stores potential energy of the movable arm in the falling process by the low pressure sealed oil tank, thereby achieving the purposes of reducing fuel consumption of the loader and increasing working efficiency of the loader.

Description

technical field [0001] The present invention relates to a hydraulic system, more specifically, the present invention relates to a loader hydraulic system. . Background technique [0002] Loaders are widely used in construction sites such as mines, infrastructure, and road maintenance, mainly for shoveling bulk materials such as earth, rocks, and minerals. Because of its simple and convenient operation, which can save a lot of manpower and improve work efficiency, loaders have become important construction machinery. [0003] In the prior art, the hydraulic system of the loader includes a hydraulic pump, a boom cylinder, a bucket cylinder, a safety valve, an oil filter, a double-acting safety valve, a manual slide valve for the boom, a manual slide valve for the bucket, and an open fuel tank. . The loading operation process includes driving, digging, lifting the boom, lowering the bucket, lowering the boom, etc. to perform cyclic operations. The digging process requires th...

AI Technical Summary

Problems solved by technology

The loading operation process includes driving, digging, lifting the boom, lowering the bucket, lowering the boom, etc. to perform cyclic operations. The digging process requires the largest engine load, while the boom lowering process does not require the engine due to the existence of gravitational potential energy. However, the existing loader is still operated by the engine to drive the hydraulic pump to complete the lowering process of the boom, and the potential energy of the falling boom cannot be recovered, and the kinetic energy of the loader cannot be recovered during the braking process, thus reducing the fuel consumption of the loader. High, low loading efficiency

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