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Luffing jib maintaining valve for hydraulic shovel

A technology for hydraulic excavators and holding valves, applied to mechanically driven excavators/dredgers, etc., can solve problems such as potential safety hazards, lower booms, accidents, etc., and achieve the effect of reducing the sinking of the boom

Active Publication Date: 2008-10-29
JIANGSU CHANGLING HYDRAULIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the bucket is full of materials or the hook on the bucket is used to lift heavy objects, the automatic lowering of the working device often leads to accidents
At the same time, when the oil pipe bursts, the boom will suddenly drop, which poses a safety hazard

Method used

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  • Luffing jib maintaining valve for hydraulic shovel
  • Luffing jib maintaining valve for hydraulic shovel
  • Luffing jib maintaining valve for hydraulic shovel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] As shown in Figs. 1 to 9, the present invention is a hydraulic excavator boom holding valve, including a valve block 1, a first valve hole and a second valve hole are opened in the valve block 1, and the first valve hole and the second valve hole are opened in the valve block 1. The valve holes are parallel to each other.

[0021] Piston 4, valve rod 6, left spring seat I 8, spring I 9, right spring seat I 11 and holding valve 14 are arranged in the first valve hole from left to right, and the cone core I 20 of holding valve 14 is in contact with the The valve stem 6 is connected, the outer edge of the cone core I 20 is provided with an O-ring IV21 and a retaining ring I 22, the right end is provided with an O-ring III 19, the outer edge of the piston 4 is provided with a combined sealing ring I 5, and the right spring seat I The outer edge of 11 is provided with a combined sealing ring III10, the left end of the first valve hole is screwed with a plug I2, and the outer...

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PUM

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Abstract

The invention relates to a movable arm maintaining valve used for hydraulic excavators, which is installed between the bottom of a movable arm hydraulic cylinder and a movable arm control valve of a hydraulic excavator and mainly used for controlling the lifting, maintaining and descending of a movable arm. The movable arm maintaining valve comprises a valve block (1) opened therein with a first valve opening and a second valve opening and provided thereon with an overflow valve (44), wherein a piston (4), a valve stem (6), a left spring holder I (8), a spring I (9), a right spring holder (11) and a maintaining valve (14) are sequentially arranged inside the first valve opening from the left to the right, a core I (20) of the maintaining valve (14) is connected with the valve stem (6), the valve opening site where the valve stem (6) locates communicates with the overflow valve (44), a left spring holder II (29), a spring III (28), a right spring holder II (26) and a non-return valve (23) are sequentially arranged at the right side from the left to the right, the core II (25) of the non-return valve (23) are matched with the inner hole of the right spring holder II (26), and the left side of the second valve opening communicates with the rodless cavity of the movable arm hydraulic cylinder of the hydraulic excavator. The inventive movable arm maintaining valve can remarkably reduce the sinkage of the movable arm, so as to be safer and more reliable.

Description

technical field [0001] The invention relates to a holding valve, which is installed between the bottom of the boom hydraulic cylinder and the boom control valve of a hydraulic excavator. It is mainly used to control the lifting, maintaining and lowering of the boom. Suitable for excavators of various tonnages. It belongs to the technical field of hydraulic control components. Background technique [0002] In a conventional hydraulic excavator, the boom hydraulic cylinder is directly connected to the boom control valve, and the boom control valve is directly used to control the rise, fall and maintenance of the boom. After the hydraulic excavator lifts the bucket off the ground, the reversing valve of the boom or stick hydraulic cylinder may be temporarily returned to the neutral position due to various reasons, and the engine is in the idle state at this time. At this time, if the valve of the reversing valve If the gap between the core and the valve body is too large, th...

Claims

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Application Information

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IPC IPC(8): E02F3/43
Inventor 邬逵清张爱军夏泽民陈酉冰潘逸明胡健松
Owner JIANGSU CHANGLING HYDRAULIC CO LTD
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