Walking hydraulic system for scissor-type overhead working truck

A technology for aerial work vehicles and hydraulic systems, which is applied to fluid pressure actuating system components, fluid pressure actuating devices, lifting devices, etc., can solve the problems of low walking pressure and discontinuous vehicle walking, saving energy and reducing pressure. Loss, increase the effect of time of use

Active Publication Date: 2014-04-02
HUNAN SINOBOOM HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the platform is lifted, it walks at a low speed. At this time, the walking pressure is the lowest, and the brake will be opened and closed from time to time, causing the vehicle to run discontinuously.

Method used

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  • Walking hydraulic system for scissor-type overhead working truck
  • Walking hydraulic system for scissor-type overhead working truck

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing.

[0010] see figure 1 , the existing scissor-type aerial work vehicle walking hydraulic system, including oil suction filter 1, power unit 2, lift two-position four-way electromagnetic reversing valve 3, lift relief valve 4, priority valve 5, steering three-position Four-way electromagnetic reversing valve 6, three-position four-way electromagnetic reversing valve 7, brake hydraulic control reversing valve 8, brake manual pump 9, one-way valve 13, steering relief valve 14, relief valve 15, return Oil filter 16, first travel motor 17, travel brake 18, lift cylinder 19, steering cylinder 20, first solenoid valve 23, second solenoid valve 24, constant flow spool 25, balance valve 26, stop valve 27, The first one-way valve 28 and the second travel motor 29, the hydraulic system is supplied with hydraulic oil by the power unit 2, the hydraulic oil enters the main valve block, the...

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PUM

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Abstract

The invention discloses a walking hydraulic system for a scissor-type overhead working truck. A power unit (2) is connected with a lifting two-position four-way electromagnetic directional valve (3), wherein the lifting two-position four-way electromagnetic directional valve (3) is connected with a priority valve (5); the priority valve (5) is connected with a steering three-position four-way electromagnetic directional valve (6); one path of the outlets of the priority valve (5) and a one-way valve (13) is connected with a walking brake (18), and the other path is connected with a three-position four-way electromagnetic directional valve (7); one oil port of the three-position four-way electromagnetic directional valve (7) is connected with a first one-way sequence valve (10); the first one-way sequence valve (10) is connected with a first walking motor (17), and is connected with a second walking motor (29) through a two-position four-way electromagnetic directional valve (12); one oil port of the three-position four-way electromagnetic directional valve (7) is connected with a second one-way sequence valve (11); the second one-way sequence valve (11) is connected with a second walking motor (29), and is connected with a first walking motor (17) through the second two-position four-way electromagnetic directional valve (12). The walking hydraulic system for the scissor-type overhead working truck has the advantages of saving energy and reducing production cost.

Description

technical field [0001] The invention relates to a scissor type aerial work vehicle, in particular to a traveling hydraulic system of the scissor type aerial work vehicle. Background technique [0002] Self-propelled hydraulic motor-driven scissor-type aerial work platforms usually require walking to have three speed switching, which is realized through the series and parallel switching of the hydraulic oil circuit between the two motors, so that the hydraulic pressure of the whole vehicle when driving at different speeds The system will have different pressures. After the platform is lifted, it walks at a low speed. At this time, the walking pressure is the lowest, and the brake will be opened and closed from time to time, causing the vehicle to run discontinuously. If a balance valve is added to the oil inlets of the two motors, the pressure adjustment will be too high, and the system pressure will be too high when driving, resulting in energy waste and greatly shortening ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66F11/04F15B11/16F15B21/04
Inventor 岳奇
Owner HUNAN SINOBOOM HEAVY IND
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