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Hydraulic excavator movable arm priority hydraulic oil way and system vibration damping hydraulic loop

A hydraulic oil circuit and system vibration reduction technology, which is applied in the direction of mechanically driven excavators/dredgers, etc., can solve the problems of large hydraulic impact of stick hydraulic cylinders and uncoordinated compound actions.

Active Publication Date: 2014-12-24
GUIZHOU JONYANG KINETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a hydraulic excavator arm priority hydraulic oil circuit and a system damping hydraulic circuit to solve the problems in the prior art that the compound action of the excavator working device is uncoordinated and the hydraulic shock of the stick hydraulic cylinder is large

Method used

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  • Hydraulic excavator movable arm priority hydraulic oil way and system vibration damping hydraulic loop
  • Hydraulic excavator movable arm priority hydraulic oil way and system vibration damping hydraulic loop

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 2 The structural layout diagram of the limit valve 5 and the bucket control valve 4 shown, the spring cover 21 has a boom priority servo port 21 and a bucket servo port 22, and the boom priority servo port 21 is connected to the boom large cavity (rodless Cavity) connected to the servo control port. When oil is fed into the large cavity servo control port of the boom and the priority servo port 21 of the boom at the same time, the servo pressure at the priority servo port 21 of the boom pushes the limit piston 23 in the limit valve 5 to move downward, and the bucket control valve 4 The bucket operating spool 24 inside moves upwards to contact the limit piston 23, and the pressure above the limit piston 23 slows down the displacement speed of the bucket control spool 24, so that the oil flow into the bucket hydraulic cylinder 15 decreases and is distributed to the dynamic The oil flow rate of the large chamber of the arm hydraulic cylinder 16 is increase...

Embodiment 2

[0031] The excavator performs compound actions, operating the boom pilot operation valve 11 and the bucket pilot operation valve 12, the boom is in the lifting state, the bucket is in the digging state, the pilot part: the pilot servo pump on the pump body 1 supplies oil, and the servo pressure oil pushes The bucket control valve 4 is in the right position, and the bucket is in the digging state; the servo pressure oil simultaneously pushes the boom control valve 2 and the boom confluence valve 3 to the right position, and the boom is in the lifting state; and the servo pressure oil enters the limit valve 5 Finally, it acts on the spool of bucket control valve 4 (the left position of bucket control valve 4). Since the cross-sectional area of ​​the limit piston is S1, the cross-sectional area of ​​the valve core is S2, and S1<S2, so PS1<PS2, that is, the right position pressure PS2 is higher than left pressure PS1. The valve core opening degree of the bucket control valve 4 is ...

Embodiment 3

[0033] Operate the stick pilot operation valve 10 alone, the stick is in the lifting state, the pilot servo pump on the pump body 1 supplies oil, and the servo pressure oil first passes through the orifice with a diameter of φ=1.0mm in the one-way throttle valve A8, slowly Push the spools of the stick confluence valve 6 and the stick control valve 7, and open the one-way valve in the one-way throttle valve A8 after the pressure rises. The slow movement of the spools of the rod confluence valve 6 and the stick control valve 7 is in the right position. The small cavity of the stick hydraulic cylinder 14 slowly enters the oil, which plays a buffering effect and shortens the delay action time. When the stick pilot operation valve 10 is stopped, the small cavity of the stick hydraulic cylinder 14 stops feeding oil, the stick confluence valve 6 and the stick control valve 7 are about to be in the neutral position, and the one-way throttle valve A8 controls the return of servo oil S...

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Abstract

The invention discloses a hydraulic excavator movable arm preferential hydraulic oil way and a system vibration damping hydraulic loop. The hydraulic oil way comprises a guiding part and a working part, and the guiding part contains a bucket rod servo oil way, a movable arm servo oil way and a bucket servo oil way. A limit valve is arranged between the bucket servo oil way and the movable arm servo oil way, an one-way throttle valve B is arranged in the movable arm servo oil way, and an one-way throttle valve A is arranged in the bucket rod servo oil way. Movable arm priority and buffer functions are respectively achieved through the limit valve and the one-way throttle valve A and the one-way throttle valve B, and problems of discordant composite actions and large machine vibration caused by hydraulic impact during starting, braking and sudden reversing are further solved.

Description

technical field [0001] The invention relates to the technical field of excavator hydraulic oil circuit design, in particular to a hydraulic excavator arm priority hydraulic oil circuit and a system vibration damping hydraulic circuit. Background technique [0002] Excavator, also known as excavating machinery (excavating machinery), is an earth-moving machine that uses buckets to dig materials higher or lower than the bearing surface, and loads them into transport vehicles or unloads them into stockyards. The materials excavated by the excavator are mainly soil, coal, sediment, and pre-loose soil and rock. Judging from the development of construction machinery in recent years, the development of excavators is relatively fast, and excavators have become the most important construction machinery in engineering construction. The walking, turning and digging actions of the excavator are all driven by the hydraulic oil circuit. In the traditional excavator, due to the unreasonab...

Claims

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Application Information

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IPC IPC(8): E02F3/42
Inventor 苏贵平郝鹏祥汤廷海王立恒龙星昊
Owner GUIZHOU JONYANG KINETICS
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