Loader four-pump quantitative confluence hydraulic system

Abstract

A loader four-pump quantitative confluence hydraulic system comprises an auxiliary pump system. The auxiliary pump system comprises a fist flow switching valve and a second flow switching valve which are used for switching the pressure oil of an auxiliary pump from supplying oil to a steering system or an operating system. The oil outlet of a brake pump is connected to a third flow switching valve used for switching the pressure oil of the brake pump from supplying oil to a full hydraulic brake unit or supplying control oil pressure used for controlling reversing switching to the first flow switching valve. The steering system is provided with a shuttle valve; two inlets of the shuttle valve are connected to two oil outlets of a steering gear and are connected to the second flow switching valve and the third flow switching valve so as to pushing the second flow switching valve and the third flow switching valve to switch during steering. The loader four-pump quantitative confluence hydraulic system has the advantages the multiple pump confluence technology is adopted, displacement of the steering pump and operating pump is reduced, and energy saving is realized; by means of a direct pump unloading manner, hydraulic impact is reduced at the end of the cylinder stroke, and meanwhile, high-pressure large-amount overflow can be avoided.

Description

technical field [0001] The invention relates to a hydraulic system of a loader, in particular to a hydraulic system of a loader electro-hydraulic controlled quantitative confluence of multiple pumps. Background technique [0002] As the main force of construction machinery, loaders are widely used in many engineering projects due to their cheap price, convenient operation, and fast movement and transition. However, they have excessive fuel consumption, excessive discharge, and oil Disadvantages such as easy leakage. With the requirement of energy saving and consumption reduction, the energy saving and consumption reduction of the loader hydraulic system has gradually been widely concerned by people. The energy consumption of the hydraulic system of the loader is mainly reflected in the volume loss of the hydraulic pump, motor and oil cylinder, various pressure losses of valve components and pipeline components, mechanical friction loss of various components, etc. These los...

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Problems solved by technology

Compared with the variable hydraulic system, the quantitative hydraulic system has the advantages of high familiarity, good reliability, strong pollution resistance, and high cost performance, and the quantitative hydraulic system can fully meet the normal operation requirements of the loader, but the quantitative hydraulic system is also There are many deficiencies, such as serious energy loss, inability to perform compound action operations, poor controllability of the system, and large hydraulic shock.

[0004] One of the characteristics of the variable hydraulic system is that it can perform stepless speed regulation, thereby reducing unnecessary energy loss, but the cost of the variable system is high, the manufacturing is difficult, the system is relatively complicated, and the components of the variable system are sensitive to the pollution of the oil. For the low-end market, the quantitative system is easier for users to accept than the variable system

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