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Hydraulic switching device, hydraulic system and engineering machinery

A technology of hydraulic switching device and hydraulic system, applied in hydraulic field

Active Publication Date: 2014-12-31
CHANGDE ZHONGLIAN ZHONGKE HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a hydraulic switching device, hydraulic system and engineering machinery to solve the problem of switching between fast and slow gears in the prior art

Method used

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  • Hydraulic switching device, hydraulic system and engineering machinery
  • Hydraulic switching device, hydraulic system and engineering machinery
  • Hydraulic switching device, hydraulic system and engineering machinery

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Embodiment Construction

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0030] As a first aspect of the present invention, a hydraulic switching device is provided, in particular, the hydraulic switching device can be used to select between two different inputs to obtain different outputs, and can be used for oil circuit switching (such as crane's Fast and slow gear switching, etc.) and other occasions.

[0031] Such as Figure 2 to Figure 5 As shown, the hydraulic switching device 100 includes a first oil inlet 110 , a second oil inlet 160 and a working oil port 170 . The hydraulic switching device 100 further includes: a reversing valve 120 , a shuttle valve 130 , a stop valve 140 and a decompression unit 150 . Wherein, the first oil inlet 110 is connected with the oil inlet 121 of the reversing valve 120 through th...

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PUM

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Abstract

The invention provides a hydraulic switching device, a hydraulic system and engineering machinery. The hydraulic switching device comprises a first oil inlet, a second oil inlet and a working oil port; the hydraulic switching device further comprises a reversing valve, a shuttle valve, a stop valve and a depressurizing unit; the first oil inlet is connected with an oil inlet of the reversing valve through the stop valve and the depressurizing unit which are serially connected; an oil outlet of the reversing valve is connected with a first inlet of the shuttle valve; a second inlet of the shuttle valve is connected with the second oil inlet; an oil outlet of the shuttle valve is connected with the working oil port. The hydraulic switching device can generate different outputs according to the state of the stop valve and the pressures of the first oil inlet and the second oil inlet, thereby driving an execution mechanism outside to work at different states, for example, working at different speeds.

Description

technical field [0001] The invention relates to the field of hydraulic pressure, and more specifically, to a hydraulic switching device, a hydraulic system and engineering machinery. Background technique [0002] figure 1 A schematic diagram of a hydraulic system of a crane in the prior art is shown. Such as figure 1 As shown, the first control unit 300 (such as a hydraulic control pilot handle) is directly connected to both ends of the control valve (not shown), and the operator controls the angle of the handle of the first control unit 300 To control the valve stem stroke of the control valve, and then realize the control of the speed of various actions. When the control valve is connected with the slewing mechanism of the crane, the stroke of its valve stem determines the speed of slewing. [0003] Please refer to figure 1 , line C provides pilot oil for control and is directly connected to the oil inlet of the handle. After the handle is pulled, which oil outlet 32...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02F15B11/02
Inventor 刘先爱
Owner CHANGDE ZHONGLIAN ZHONGKE HYDRAULIC