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Loader distribution valve and loader hydraulic system

A technology of hydraulic system and distribution valve, which is applied in the direction of earth mover/shovel, construction, etc., can solve the problems such as the convergence of the breakout force of the boom and the bucket, and the inability of the quantitative hydraulic system of the loader to realize compound actions, etc. , to achieve the effect of reducing energy consumption

Active Publication Date: 2022-05-13
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a loader for the problems that the quantitative hydraulic system of the existing loader cannot realize the compound action, there will be a large flow of high-pressure overflow loss and the convergence of the breakout force of the boom and the breakout force of the bucket. Machine-use distribution valve and loader hydraulic system, in order to realize compound action of the quantitative hydraulic system of the loader, and at the same time, the pressure of the boom and bucket joint is set separately to achieve better matching conditions

Method used

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  • Loader distribution valve and loader hydraulic system
  • Loader distribution valve and loader hydraulic system

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the loader distribution valve 1 in this embodiment has B1 oil port and B2 oil port for connecting with the bucket oil cylinder, A1 oil port and A2 oil port for connecting with the boom oil cylinder, and used for connecting with the pressure PB3 oil port and PB4 oil port for oil source connection, T oil port for connecting with hydraulic oil tank, a1 oil port, a2 oil port, b1 oil port and b2 oil port for connecting with pilot valve, for external The LS2 oil port for outputting the load signal of the bucket joint and the LS1 oil port for outputting the load signal of the boom joint to the outside.

[0027] The distribution valve 1 includes a main control valve 3 for the boom linkage, a main control valve 2 for the bucket linkage, a first relief valve 4 , a second relief valve 5 , a third relief valve 6 , and a hydraulic control switch valve 8 .

[0028] B1 oil port and B2 oil port are connected with the internal working oil circuit of the main ...

Embodiment 2

[0036] Such as figure 2 As shown, the hydraulic system in this embodiment is a loader hydraulic system, the first pressure oil source, the second pressure oil source, the bucket oil cylinder 22, the boom oil cylinder 21, the pilot valve 24, the shuttle valve group 25, and the pilot valve 24 connected to the pilot oil source 23, the distribution valve 1 in the first embodiment, the first unloading valve 10, the second unloading valve 15, the steering system, the hydraulic oil tank 32 and other components.

[0037] The first pressure oil source is the first hydraulic pump 28 , and the second pressure oil source is the second hydraulic pump 29 . The first hydraulic pump 28 and the second hydraulic pump 29 are quantitative pumps, and their oil inlets are all connected with the hydraulic oil tank. The oil outlet of the first hydraulic pump 28 is communicated with the PB3 oil port of the distribution valve. The oil outlet is connected with the oil inlet end of the first unloading ...

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Abstract

The invention relates to a distribution valve for a loader and a hydraulic system of the loader. In order to solve the problem that the existing quantitative hydraulic system of the loader cannot realize compound action, there will be a large flow and high pressure overflow loss, and the breakout force of the boom and the breakout force of the bucket will converge. Problem: To provide a distribution valve and hydraulic system for loaders, the PB3 oil port of the distribution valve is connected to the first relief valve and the oil inlet port of the main valve controlled by the bucket unit at the same time, and the oil outlet of the main valve is controlled by the boom unit Port is connected with PB3 oil port, PB4 oil port is connected with the oil inlet port of the main control valve of the boom linkage; The load signal of bucket union is compared with the shuttle valve and enters the load signal LS oil circuit, and the liquid control end of the first relief valve and the oil inlet port of the second relief valve are connected with the load signal LS oil circuit at the same time. The invention can reduce energy consumption, and can perform compound actions of bucket turning action and boom action.

Description

technical field [0001] The invention relates to a distributing valve, in particular to a distributing valve for a loader and a hydraulic system of the loader. Background technique [0002] The current quantitative hydraulic system for loaders uses an open center distribution valve, a series and parallel oil circuit structure, and the action of the bucket is given priority, so compound actions cannot be realized. In addition, if the independent or confluent system is used, when the pressure exceeds the setting of the main safety valve, there will be a high-pressure overflow loss with a large flow rate and a large energy loss. Due to the limitations of the working device mechanism, it is necessary to optimize the bore of the hydraulic cylinder to achieve a reasonable match between the breakout force of the boom and the breakout force of the bucket, which is limited by the bore type of the hydraulic cylinder, and due to considerations such as cost and parts versatility, often ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22
CPCE02F9/22E02F9/2267E02F9/2271E02F9/2221E02F9/2292
Inventor 梁振国初长祥朱斌强李泽华王允贾崇
Owner GUANGXI LIUGONG MASCH CO LTD