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Hydraulic system of variable-amplitude mechanism of crank arm type overhead working truck

A technology of aerial work vehicle and luffing mechanism, which is applied in the directions of fluid pressure actuation system components, cranes, mechanical equipment, etc., can solve the problems of secondary arm bending deformation, damage, deformation of the contact part of the secondary arm and the connecting hub, etc. Achieve the effect of avoiding extrusion damage, prolonging service life and reducing fatigue damage

Pending Publication Date: 2022-01-11
法兰泰克(常州)工程机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the balance valve of the lower luffing cylinder locks the oil in the cylinder, the lower luffing cylinder is also equivalent to a rigid component. After the secondary arm is under pressure, it cannot automatically adjust the attitude of the boom through the expansion and contraction of the lower luffing cylinder to relieve the pressure. If it is dropped, the secondary arm will be bent and deformed, and the contact part between the secondary arm and the connecting hub will be compressed, deformed or even damaged.
After long-term operation, it will shorten the service life of structural parts and equipment

Method used

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  • Hydraulic system of variable-amplitude mechanism of crank arm type overhead working truck
  • Hydraulic system of variable-amplitude mechanism of crank arm type overhead working truck

Examples

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

[0019] refer to figure 1 As shown, a hydraulic system of the luffing mechanism of the crank-arm type aerial work vehicle of the present invention includes:

[0020] The upper luffing oil cylinder 1, the upper luffing oil cylinder 1 includes an upper luffing rodless cavity 11 and an upper luffing rod cavity 12;

[0021] The lower luffing oil cylinder 2, the lower luffing oil cylinder 2 includes a lower luffing rodless cavity 21 and a lower luffing rod cavity 22;

[0022] The first reversing valve 3, the first reversing valve 3 includes a first working port 31 and a second working port 32;

[0023] The second reversing valve 4, the first reversing valve 3 includes a third working ...

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Abstract

The invention relates to a hydraulic system of a variable-amplitude mechanism of a crank arm type overhead working truck. The hydraulic system comprises an upper variable-amplitude oil cylinder, a lower variable-amplitude oil cylinder, a first reversing valve, a second reversing valve and a balance adjusting assembly, wherein the upper variable-amplitude oil cylinder comprises an upper variable-amplitude rodless cavity and an upper variable-amplitude rod cavity; the lower variable-amplitude oil cylinder comprises a lower variable-amplitude rodless cavity and a lower variable-amplitude rod cavity; the first reversing valve comprises a first working port and a second working port; the first reversing valve comprises a third working port and a fourth working port; and the balance adjusting assembly comprises four balance valves and a shuttle valve. When the upper variable-amplitude oil cylinder drives a telescopic arm to descend, the telescopic arm is in contact with a support on a secondary arm and continuously presses downwards, at the moment, a balance valve of the rod cavity of the lower variable-amplitude oil cylinder is opened, a piston rod of the lower variable-amplitude oil cylinder extends out, the pressure borne by the secondary arm is relieved, bending deformation of the secondary arm and extrusion damage of a contact part of a structural part are avoided, fatigue damage of the structural part is relieved, and the service life of equipment is prolonged.

Description

technical field [0001] The invention relates to the technical field of aerial work vehicles, in particular to a hydraulic system of a luffing mechanism of an articulating arm type aerial work vehicle. Background technique [0002] When the traditional crank-arm type aerial work vehicle is retracted for operation, the lower luffing cylinder drives the main arm and the secondary arm to lower, and after reaching the position, the upper luffing cylinder is operated to drive the telescopic arm to lower. When the telescopic arm is about to be put in place, the manual operation cannot stop in time. Even after the operation button is stopped, the luffing cylinder still has a small displacement due to the inertia of the moving parts and the closing slope of the hydraulic valve. Under the effect of these two factors, the telescopic arm will continue to press down after having contacted the support on the secondary arm. Because the balance valve of the lower luffing cylinder locks the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66C23/06B66C23/42B66C23/62B66C23/68B66C23/82B66C13/20F15B21/08F15B11/16F15B13/06
CPCB66C23/06B66C23/42B66C23/62B66C23/68B66C23/821B66C13/20F15B21/087F15B11/16F15B13/06
Inventor 卢伟
Owner 法兰泰克(常州)工程机械有限公司
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