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Quantitative and variable load sensitive confluence hydraulic system and loader

A hydraulic system and load-sensitive technology, applied in the field of hydraulic system, can solve the problem of inability to realize the load-sensitive control of the working hydraulic system, and achieve the effect of no overflow loss

Active Publication Date: 2017-03-08
GUANGXI LIUGONG MASCH CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Quantitative and variable load sensitive confluence hydraulic system and loader
  • Quantitative and variable load sensitive confluence hydraulic system and loader
  • Quantitative and variable load sensitive confluence hydraulic system and loader

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Embodiment Construction

[0021] The specific implementation will be described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, in this embodiment, a constant variable load sensitive confluence hydraulic system of a loader includes a steering hydraulic system and a working hydraulic system. The steering hydraulic system includes a variable variable pump 1, a priority valve 2, a steering gear 3, and a steering cylinder 4; the variable variable pump Port P of 1 is connected to the oil inlet port of the priority valve 2 through the pipeline, the oil outlet port of the priority valve 2 is connected to the steering gear 3, and the A oil port and B oil port of the steering gear are connected to the large cavity and the small cavity of the steering cylinder 4 , the LS2 port of the priority valve 2 communicates with the LS1 port of the steering gear 3 through the pipeline.

[0023] The working hydraulic system includes a quantitative pump 10 , an unloading valve 11 , a ...

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Abstract

The invention relates to a hydraulic system to solve the problem that in an existing quantitative and variable hydraulic system, when a work hydraulic system acts, a steering variable pump cannot conduct load sensitive control on the work hydraulic system. A novel quantitative and variable load sensitive confluence hydraulic system and a loader are provided. The novel quantitative and variable load sensitive confluence hydraulic system comprises a steering hydraulic system and a work hydraulic system. The steering hydraulic system comprises a variable pump, a priority valve, a steering gear, a steering oil cylinder and the like. The work hydraulic system comprises a constant displacement pump, a distribution valve, a hydraulic execution piece, a pilot valve and the like. A first signal control valve and a second signal control valve connected to a bypass from a work pump to the execution piece are used for collecting load signals on a work oil way, the load signals of the work oil way are transmitted to the variable pump through a shuttle valve, and the load sensitive control over the work hydraulic system through the variable pump is achieved.

Description

technical field [0001] The invention relates to a hydraulic system, more specifically, to a constant variable load sensitive combined hydraulic system and a loader. 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 transpor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
CPCE02F9/2239E02F9/2246E02F9/225
Inventor 武宗才梁振国王允
Owner GUANGXI LIUGONG MASCH CO LTD
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