Fixed-displacement and variable-displacement hydraulic system of loading machine

A variable system and hydraulic system technology, applied in the field of hydraulic systems, can solve the problem that the steering variable pump cannot realize the variable control of the working hydraulic system, etc.

Active Publication Date: 2018-02-23
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a loader constant variable system for the problem that the steering variable pump cannot realize the variable control of the working hydraulic system when the working hydraulic system operates in the existing loader constant variable hydraulic system

Method used

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  • Fixed-displacement and variable-displacement hydraulic system of loading machine
  • Fixed-displacement and variable-displacement hydraulic system of loading machine
  • Fixed-displacement and variable-displacement hydraulic system of loading machine

Examples

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Embodiment Construction

[0027] The specific implementation will be described below in conjunction with the accompanying drawings.

[0028] The fixed variable system of the loader in this embodiment is as follows: figure 1 As shown, the system includes a steering hydraulic system and a working hydraulic system, a shuttle valve 7, a shuttle valve group 9, a load simulation valve 8, a pilot oil supply valve 16, and the like.

[0029] The hydraulic steering system includes a steering cylinder 4, a steering gear 3 that is connected to the steering cylinder 4 and controls the expansion and contraction of the steering cylinder 4, a priority valve 2 that connects the priority oil supply port CF to the working oil inlet port of the steering gear 3, and the pump port and the priority valve 2 The steering variable pump 1 connected to the working oil inlet of the steering variable pump 1, and the hydraulic oil tank 17 connected to the oil inlet of the steering variable pump 1. The variable steering pump 1 draws...

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Abstract

The invention relates to a hydraulic system, solves the problem that variable-displacement steering pumps cannot perform variable-displacement control on working hydraulic systems when the working hydraulic systems in existing fixed-displacement and variable-displacement hydraulic systems act, and provides a fixed-displacement and variable-displacement hydraulic system of a loading machine. The fixed-displacement and variable-displacement hydraulic system comprises a steering hydraulic system and a working hydraulic system; the steering hydraulic system comprises a variable-displacement steering pump, a pressure-gradient control valve, a steering gear, a steering oil cylinder and the like; the working hydraulic system comprises a fixed-displacement pump, a distribution valve, a hydraulic actuator, a pilot valve, a shuttle valve group and the like; when a pilot handle acts, a load signal acquired from the distribution valve is transmitted to a load simulating valve on a bypass from a steering pump to the distribution valve, the differential pressure of the loading pressure acquired by the pump and the distribution valve is amplified by the aid of the difference between acting areasof two differential pressure of the load simulating valve, the amplified differential pressure finally acts on a flow control valve of the steering pump, and variable-displacement control on the working hydraulic system by the variable-displacement steering pump is realized.

Description

technical field [0001] The invention relates to a hydraulic system, more specifically, to a loader constant displacement hydraulic system. Background technique [0002] Hydraulic systems are mostly used in construction machinery, and most of the hydraulic systems of loaders in China are quantitative hydraulic systems. Its hydraulic system consists of quantitative pump, steering gear, flow amplification valve (priority valve), steering cylinder, distribution valve, boom cylinder, bucket cylinder and other components. In the existing loader quantitative hydraulic system, the energy loss of the quantitative pump is ignored. Since the pump displacement is a fixed value, the system flow rate is only related to the engine speed; when turning alone, except for the flow required for steering, the excess flow returns to the fuel tank through the middle position of the distribution valve with a certain back pressure, resulting in energy loss; during transportation In the working con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
Inventor 梁振国谭艳辉武宗才王允
Owner GUANGXI LIUGONG MASCH CO LTD
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