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Lifting and descending hydraulic system of scissor fork type aerial lift vehicle platform

A technology for aerial work vehicles and hydraulic systems, which is applied in the direction of lifting devices, fluid pressure actuators, servo motor components, etc., can solve problems such as reduced cylinder life, high self-priming resistance, and damage to seals, so as to prolong the service life, Easy oil absorption, volume reduction effect

Active Publication Date: 2014-10-15
HUNAN SINOBOOM HEAVY IND
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AI Technical Summary

Problems solved by technology

[0002] Double-lift cylinder scissor-type aerial work platform usually lifts the rodless cavity and the oil circuit of the rod cavity is separated. When the platform is lowered, the hydraulic oil in the lift cylinder rodless cavity returns to the oil tank through the oil inlet hydraulic hose, and the rod The negative pressure generated in the cavity relies on the self-priming ability to absorb oil from the hydraulic oil tank. Since the scissor-type aerial work vehicle is vertically rising and falling, the higher the lifting height, the greater the self-priming resistance, and the worse the self-priming ability, resulting in the lifting of the cylinder. The rod cavity produces air suction, which damages the seal and reduces the life of the cylinder

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  • Lifting and descending hydraulic system of scissor fork type aerial lift vehicle platform
  • Lifting and descending hydraulic system of scissor fork type aerial lift vehicle platform

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with accompanying drawing.

[0020] see figure 1 , the existing scissor-type aerial work vehicle walking hydraulic system, including the pressure oil pipe 16, the first one-way valve 1, the overweight sensor 3, the lower lifting cylinder 5, the two-position two-way manual electromagnetic reversing valve 6, the upper lifting Oil cylinder 8, fuel tank 9, second overflow valve 10, second damper 11, second check valve 12, first damper 13, two-position two-way electromagnetic reversing valve 14. When the platform is lifted, the pressure oil enters the first check valve 1 and the second check valve 12 respectively, and then enters the lower lifting cylinder 5 and the upper lifting cylinder 8 respectively. When the platform is lowered, the 2-position 2-way manual electromagnetic directional valve 6 and the 2-position 2-way electromagnetic directional valve 14 are energized, and the hydraulic oil passes throu...

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Abstract

The invention discloses a lifting and descending hydraulic system of a scissor fork type aerial lift vehicle platform. An outlet of a fourth one-way valve (2) is connected with an outlet of a first one-way valve (1); a rodless cavity of a lower lifting oil cylinder (5) is connected with a first overflow valve (4); an outlet of the first overflow valve (4) is connected with an oil return pipe (17); an outlet of a second one-way valve (12) is connected with an inlet of a third one-way valve (7); an inlet of the fourth one-way valve (2) is connected with a second damper (11); an outlet of the third one-way valve (7) and the second damper (11) are connected with a rodless cavity of an upper lifting oil cylinder (8); the rodless cavity of the upper lifting oil cylinder (8) is connected with the oil return pipe (17) by virtue of a second overflow valve (10). During descending of the platform, the rodless cavities of the lifting oil cylinders suck oil easily, so that the service lives of the oil cylinders are prolonged.

Description

technical field [0001] The invention relates to a scissor-type high-altitude operation vehicle platform, in particular to a hydraulic system for lifting and lowering the scissor-type high-altitude operation vehicle platform. Background technique [0002] Double-lift cylinder scissor-type aerial work platform usually lifts the rodless cavity and the oil circuit of the rod cavity is separated. When the platform is lowered, the hydraulic oil in the lift cylinder rodless cavity returns to the oil tank through the oil inlet hydraulic hose, and the rod The negative pressure generated in the cavity relies on the self-priming ability to absorb oil from the hydraulic oil tank. Since the scissor-type aerial work vehicle is vertically rising and falling, the higher the lifting height, the greater the self-priming resistance, and the worse the self-priming ability, resulting in the lifting of the cylinder. The rod cavity produces air suction, which damages the seal and reduces the life ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B66F11/04F15B13/02
Inventor 刘国良岳奇
Owner HUNAN SINOBOOM HEAVY IND
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