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Hydraulic system for lifting and lowering action of a scissor-type aerial work vehicle platform

A kind of high-altitude operation vehicle and hydraulic system technology, which is applied in the direction of lifting device, fluid pressure actuator, servo motor assembly, etc., which can solve the problems of reduced cylinder life, poor self-priming ability, and large self-priming resistance, etc., to prolong the service life , reduced volume, easy oil absorption effect

Active Publication Date: 2016-04-20
HUNAN SINOBOOM HEAVY IND
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  • Abstract
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  • Claims
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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

Method used

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  • Hydraulic system for lifting and lowering action of a scissor-type aerial work vehicle platform
  • Hydraulic system for lifting and lowering action of a scissor-type aerial work vehicle platform

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the drawings.

[0020] See figure 1 , The existing scissor-type aerial work vehicle traveling 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 The oil cylinder 8, the oil tank 9, the second relief valve 10, the second damping 11, the second one-way valve 12, the first damping 13, and the 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 two-position two-way solenoid directional valve 6 and the two-position solenoid directional valve 14 are both energized, and the hydraulic oil passe...

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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 aerial work platform, in particular to a lifting and lowering action hydraulic system of a scissor type aerial work platform. Background technique [0002] Double-lifting cylinder scissor aerial work platforms usually have separate rod-less cavity and rod-mounted oil circuits of the lifting cylinder. When the platform is lowered, the hydraulic oil of the rod-less cavity of the lifting cylinder is returned to the tank through the oil inlet hydraulic hose. The cavity generates negative pressure and sucks oil from the hydraulic oil tank by its self-priming ability. Because the scissor-type aerial vehicle is in vertical ascent and descending conditions, the higher the lifting height, the greater the self-priming resistance and the worse the self-priming ability, resulting in the lifting cylinder The rod cavity produces suction, which damages the seals and reduces the life of the cylinder. When the platform is manually lo...

Claims

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Application Information

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