Valve path structure for prior control over movable arm and hydraulic excavator

A technology for priority control valves and hydraulic excavators, which is applied to earth movers/shovels, construction, etc., can solve problems affecting operating efficiency and increasing oil circuit resistance, so as to improve operability, reduce fuel consumption, and improve safety sexual effect

Inactive Publication Date: 2017-05-31
SUOTE TRANSMISSION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art that affect the working efficiency, increase the resistance to the imported oil circuit, and may cause problems in leveling operations, the present invention provides a boom priority control valve circuit structure and a hydraulic excavator

Method used

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  • Valve path structure for prior control over movable arm and hydraulic excavator
  • Valve path structure for prior control over movable arm and hydraulic excavator

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Embodiment

[0028] See Figure 1 to Figure 2 As shown, it shows a preferred embodiment of the boom priority control valve circuit structure, which is suitable for the control oil circuit of hydraulic excavators, including the boom control oil circuit and the common oil circuit 8, the boom control oil circuit Including switching valve 1, boom cylinder 2 and anti-reverse valve 3, switching valve 1 is connected to boom cylinder 2 through two oil pipes 4, the oil inlet 5 of switching valve 1 is connected to fuel tank 7, and the outlet inspection port of switching valve 1 6 is directly connected to the common oil passage 8 through the anti-reverse valve 3.

[0029] On the basis of the above, the present invention also has the following implementation modes, please continue to refer to figure 1 and figure 2 as shown,

[0030] In a further embodiment of the present invention, it also includes a stick control oil circuit, including a stick cylinder 9, a switching valve 1 and a pressure compen...

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PUM

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Abstract

The invention discloses a valve path structure for prior control over a movable arm and a hydraulic excavator. The valve path structure for prior control over the movable arm comprises a movable arm control oil path and a common oil path. The movable arm control oil path comprises a switching valve, a movable arm oil cylinder and a check valve, wherein the switching valve is connected to the movable arm oil cylinder through two oil pipes, an oil inlet of the switching valve is connected to an oil tank, and an oil discharging and checking port of the switching valve is directly connected to the common oil path through the check valve. According to the valve path structure for prior control over the movable arm, when oil is supplied to an air cylinder port from an oil pumping port, hydraulic oil can be supplied to the movable arm oil cylinder without completely passing through a pressure compensation valve; the hydraulic oil is directly guided to the common LS oil path from the oil discharging and checking port of the switching valve of the movable arm oil cylinder so that oil consumption can be reduced, and operability can be improved; the shape of the valve path structure for prior control over the movable arm is simplified, the number of components of the valve path structure for prior control over the movable arm is reduced, and cost can be reduced; the operability of compound action of components including the movable arm is improved instead of being reduced; and during work on the flat ground, instant falling of a bucket rod can be prevented, and safety is improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic excavators, in particular to a boom priority control valve circuit structure and a hydraulic excavator. Background technique [0002] The structural form of the control valve of the usual hydraulic excavator load-sensitive hydraulic system is generally composed of several pieces of the same switching valve housing, or it is composed of integral housing castings. Usually the hydraulic oil is supplied from the common pump oil circuit to the pump oil port of the boom cylinder switching valve, and then supplied to the oil cylinder port from the detection port through the pressure compensation valve. Therefore, even if the opening of the pressure compensating valve is at the maximum opening, when the hydraulic oil passes through the compensating valve, pressure loss will occur, especially when the boom is raised with a large amount of oil supply, which is not conducive to energy saving. On the one h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22
CPCE02F9/2264E02F9/2267
Inventor 樊旭春于晓晨陆爱华
Owner SUOTE TRANSMISSION EQUIP
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