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Step-down system and construction machinery

An oil storage and branch circuit technology, applied in the hydraulic field, can solve the problem of high oil return back pressure

Inactive Publication Date: 2016-08-24
SANY AUTOMOBILE HOISTING MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to provide a decompression system, which can effectively solve the problem of excessive oil return back pressure of the control valve of the hydraulic system of construction machinery, thereby ensuring the normal operation of the control valve of the hydraulic system

Method used

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  • Step-down system and construction machinery
  • Step-down system and construction machinery
  • Step-down system and construction machinery

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Embodiment Construction

[0021] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0022] see figure 1 and figure 2 , shows a schematic diagram of the decompression system provided by the first embodiment of the present invention. For illustrative purposes, figure 1 and figure 2 A schematic diagram of a hydraulic system of an engineering machine where the depressurization system is applied is also shown in .

[0023] As shown in the figure, the decompression system at least includes: oil inlet oil passage 11, oil return oil passage 12, first oil discharge oil passage 13, reversing valve 2, first oil storage cylinder 3, first branch 31, The second branch 32 and the first one-way valve 41 .

[0024] Wherein, both the oil inlet oil passage 11 and the oil return oil passa...

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Abstract

The invention provides a decompression system and construction machinery, the decompression system includes: oil inlet oil circuit, oil return oil circuit, first oil discharge oil circuit, reversing valve, first oil storage cylinder, first branch circuit , the second branch and the first one-way valve; the oil inlet circuit and the oil return circuit are connected to the first branch through the reversing valve, and the first branch is connected to the rod chamber of the first oil storage cylinder; When the reversing valve is in the first valve position, the oil inlet circuit communicates with the first branch; when the reversing valve is in the second valve position, the oil return circuit communicates with the first branch; the oil return circuit passes through the second branch Connected with the rodless cavity of the first oil storage cylinder, the first one-way valve is set on the second branch; the inlet of the first one-way valve communicates with the oil return circuit, and the outlet communicates with the rodless cavity of the first oil storage cylinder ; The rodless chamber of the first oil storage cylinder communicates with the oil return tank through the first oil drain circuit. The depressurization system provided by the invention can effectively reduce the oil return back pressure in the hydraulic system of construction machinery and ensure the normal operation of valves in the hydraulic system.

Description

technical field [0001] The invention relates to the field of hydraulic pressure, and more specifically, to a depressurization system and engineering machinery. Background technique [0002] For the control valves of the hydraulic system of construction machinery, especially the electro-hydraulic reversing valves, hydraulic control balance valves and other components, it is generally required that the oil return pressure of the oil return port (also called the oil drain port) be maintained at a certain level during use. The level is low, but due to the need for the layout of construction machinery structural parts, the control valve of the hydraulic system is installed far away from the hydraulic oil tank (also called the oil return tank) in many cases, and some control valves are even farther away from the hydraulic oil tank. Up to 20 meters or more, the oil return port of the control valve needs to be connected to the hydraulic oil tank through a very long oil return line. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B11/16
CPCF15B11/16
Inventor 田伟光耿晓晨
Owner SANY AUTOMOBILE HOISTING MACHINERY
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