Unlock instant, AI-driven research and patent intelligence for your innovation.

Hydraulic system of high-low pressure unloading valve and loader

An unloading valve, high and low pressure technology, applied in valve devices, fluid pressure actuators, multi-way valves, etc., can solve problems such as extreme noise and high-frequency vibration

Active Publication Date: 2019-01-25
GUANGXI LIUGONG MASCH CO LTD
View PDF9 Cites 0 Cited by
  • 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 high and low pressure unloading valve and loader hydraulic system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydraulic system of high-low pressure unloading valve and loader
  • Hydraulic system of high-low pressure unloading valve and loader
  • Hydraulic system of high-low pressure unloading valve and loader

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] like figure 1 As shown, the loader hydraulic system in this embodiment includes a steering system 4 and a working hydraulic system. The working hydraulic system includes a hydraulic oil tank 1, a quantitative pump 2 connected to the oil inlet and the hydraulic oil tank, a distribution valve 5, and a hydraulic oil tank connected to the distribution valve. The working oil cylinder, the pilot valve 9 connected with the distribution valve, the pilot oil source 10 for supplying oil to the pilot valve, the pilot pressure signal outlet valve 8 connected with each pilot pressure signal output circuit of the pilot valve and leading out the maximum pilot pressure signal, and the high and low pressure The unloading valve 3 and the working cylinder include a boom cylinder 7 and a bucket cylinder 6.

[0024] like figure 2 As shown, the high and low pressure unloading valve 3 includes P1 oil port, P2 oil port, LS oil port, T oil port, slide valve 31, first one-way valve 32, second ...

Embodiment 2

[0033] like Figure 5 , Image 6 As shown, compared with Embodiment 1, the difference in this embodiment is that the sixth chamber 316 is unidirectionally connected to the B oil port through the second check valve 34 and in the connection between the sixth chamber 316 and the two-position three-way valve 33 A damping hole 35 connected in series with the second one-way valve 34 is arranged on the oil passage between the B oil ports. In this embodiment, when there is no action operation or only micro-action, the valve core 319 is in the first position state, such as Image 6 As shown, the hydraulic oil output by the quantitative pump 2 enters the hydraulic oil tank 1 through the third chamber 313, the second chamber 312 and the T port to realize unloading at low load (low pressure unloading). At this time, the first one-way valve 32 is closed, and during inching operation, the steering system 4 supplies oil to the distribution valve 5 to realize the inching action of the actio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a high-low pressure unloading valve, aiming at solving the problem that the existing unloading valve will generate high-frequency vibration and great noise when the loading pressure fluctuates near the unloading design pressure. Provided is a high-low pressure unloading valve, wherein a slide valve is axially provided with a first cavity to a sixth cavity along a valve core, a spring is arranged in the first cavity, a fifth cavity and the sixth cavity are hydraulic control ends, the first cavity, a second cavity and a fourth cavity are both communicated with a T oil port, an oil inlet is communicated with a third cavity, the third cavity is connected with a P2 oil port through a one-way valve, the fifth cavity is connected with the oil outlet or the T oil port of atwo-position three-way valve, the hydraulic control end of the two-position three-way valve is connected with a LS oil port, and the third cavity and the fourth cavity are communicated after the fifth cavity and the sixth cavity are communicated. The hydraulic system of high-low pressure unloading valve and the loader is capable of achieving high and low pressure unloading and allowing loading pressure to fluctuate within a certain range during high pressure unloading without frequently opening and closing an unloading function.

Description

technical field [0001] The invention relates to a hydraulic component, in particular to a high and low pressure unloading valve and a loader hydraulic system. Background technique [0002] At present, the loader adopts a hydraulic system with an unloading valve, and the unloading valve is generally a high-pressure unloading valve; that is, when the control pressure of the hydraulic system reaches the high pressure set by the unloading valve, the quantitative pump realizes low-pressure unloading. The disadvantage is that when the load pressure fluctuates near the set unloading pressure, the unloading valve will be unloaded, that is, the unloading valve will generate high-frequency vibration, which will produce a lot of noise and cause the whole machine to be unloaded. Oscillation; when the working device of the whole machine is not in action, the flow provided by the quantitative working pump passes through the unloading valve and the distribution valve and finally flows back...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F16K11/07F16K17/04E02F9/22
CPCE02F9/2221F15B13/024F16K11/07F16K17/044F16K17/0473
Inventor 梁振国武宗才王允
Owner GUANGXI LIUGONG MASCH CO LTD