Novel load retaining valve structure for excavator

A load-holding valve and excavator technology, which is applied to multi-port valves, valve devices, mechanical equipment, etc., can solve the hidden safety hazards of workers, large leakage in the load-holding valve, and large settlement of excavator sticks and booms. and other problems to achieve the effect of improving stability and security and ensuring rapid response.

Pending Publication Date: 2015-12-16
SHANDONG CHANGLIN MACHINERY GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the load holding valve we use currently has a certain amount of internal leakage and the internal leakage is relatively large
This large amount of internal leakage directly leads to a large settlement of the excavator stick and boom, which affects the working stability and safety of the excavator, and at the same time, there are certain safety hazards for the staff

Method used

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  • Novel load retaining valve structure for excavator
  • Novel load retaining valve structure for excavator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 As shown, the present invention provides a new type of load holding valve structure for excavators, including a valve body 1 and an abdominal cavity arranged in the valve body 1. The abdominal cavity includes a first abdominal cavity 2 and a second abdominal cavity located on the right side of the first abdominal cavity 2. Abdominal cavity 3, the first abdominal cavity 2 communicates with the second abdominal cavity 3.

[0022] Such as figure 1 As shown, a cone valve core 5 and a valve sleeve 7 are sequentially arranged in the first abdominal cavity 2 from left to right. The right end of the cone spool 5 is horizontally provided with a push post 6, and the cone spool 5 is movable and located in the first abdominal cavity 2; a through cavity 8 is opened on the horizontal center axis of the valve sleeve 7, and the push post 6 runs through the cavity 8 And its length is longer than the length of the cavity 8.

[0023] The first overflow hole 20 is provi...

Embodiment 2

[0030] The present invention provides a new type of load holding valve structure for excavators, the structure is as described in Embodiment 1, the difference is that: figure 1 As shown, the valve body 1 is also provided with a first screw plug 14, which is located on the left side of the first abdominal cavity 2; the right end of the first screw plug 14 is provided with a damping spring 16, and the cone valve core 5 A boss 17 is provided, the left end of the cone valve core 5 passes through the damping spring 16 and is located in the first screw plug 14 , and the damping spring 16 is located between the boss 17 and the first screw plug 14 . When the plunger 9 pushes the cone valve core 5 to move to the left, the boss 17 compresses the damping spring 16 and at the same time the cone seal structure formed by the cone valve core 5 and the valve sleeve 7 is opened, at this time the high-pressure oil in the first abdominal cavity enters the valve sleeve 7 through cavity 8, and the...

Embodiment 3

[0032] The present invention provides a new cone sealing structure, the structure is as described in Embodiment 1, the difference is that: figure 1As shown, there is a discharge hole 18 on the central axis of the pilot valve core 10 ; the valve body 1 is also provided with an oil discharge port 19 , and the oil discharge port 19 communicates with the second abdominal cavity 3 through the overflow hole 18 . The discharge hole 18 can remove excess hydraulic oil accumulated and stored in the second abdominal cavity 3 to ensure the smooth movement of the plunger 9 .

[0033] The working principle of the present invention is as follows:

[0034] (1) When a load such as a boom is held, the first abdominal cavity 2 is a high-pressure chamber, and the hydraulic oil presses the cone valve core 5 onto the valve sleeve 7; this structure can control the leakage in the load holding valve to 2ml within / min.

[0035] (2) The P1 oil inlet 12 is fed with pilot oil to push the pilot spool 10...

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PUM

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Abstract

The invention discloses a novel load retaining valve structure for an excavator. The novel load retaining valve structure comprises a valve body and cavities formed in the valve body. The cavities comprise the first cavity and the second cavity disposed on the right side of the first cavity and communicated with the first cavity. A tapered valve element is arranged on the left side of the first cavity, and an ejecting column is arranged at the right end of the tapered valve element horizontally. A valve sleeve is arranged on the right side of the tapered valve element, a through cavity is formed in the horizontal central axis of the valve sleeve, and the ejecting column is located in the through cavity in a penetrating mode. A plunger is movably arranged in the second cavity, and the area of the cross section of the plunger is larger than that of the cross section of the ejecting column. According to the novel load retaining valve structure for the excavator, an existing load retaining valve structure is changed so that the leakage amount can be controlled within 2ml/min, the settling volume of a movable arm can be effectively prevented from being too large, and the stability and the safety of the excavator are improved.

Description

technical field [0001] The invention relates to a load holding valve, and mainly relates to a novel load holding valve structure for an excavator. Background technique [0002] The load holding system is an essential hydraulic system in the hydraulic system of the excavator. It is used to ensure that the excavator can maintain a certain action for a long time, such as the maintenance of the stick and the boom in the excavator. It can ensure that the excavator can complete some basic functions. lifting operations. The load holding valve is the most critical part of the load holding system, and its quality directly affects the quality of the excavator's hoisting operation, and even threatens the personal safety of the staff. Therefore, the quality of the load holding valve will directly affect the performance of the load holding system. [0003] However, the load holding valve we use currently has a certain internal leakage and the internal leakage is relatively large. This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B13/02F16K11/065
CPCF15B13/02F16K11/0655
Inventor 李合永张海洋巩秀江郭立金武超杜艳祈焕英赵光明
Owner SHANDONG CHANGLIN MACHINERY GRP
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