Hydraulic pipeline system for forklift two-section full-free gantry

Abstract

The invention relates to a hydraulic pipeline system for a forklift two-section full-free gantry. The system comprises a left rear lifting oil cylinder, a right rear lifting oil cylinder, a front lifting oil cylinder, a speed limiting valve and a lifting valve. The lifting valve is a three-position six-way valve. The hydraulic pipeline system is improved in that a two-position two-way electromagnetic valve is connected in series at an inlet of a block valve on an oil inlet of the left rear lifting oil cylinder; the effective working area of the front lifting oil cylinder is equal to twice of the sum of the effective areas of the left rear lifting oil cylinder and the right rear lifting oil cylinder; and the effective area of the left rear lifting oil cylinder is equal to that of the rightrear lifting oil cylinder. As the two-position two-way electromagnetic valve is added and the cylinder diameter of the front lifting oil cylinder is obtained by reducing the cylinder diameter of the front lifting oil cylinder of a common two-section full-free gantry, the gantry can be ensured to have consistent speed in the complete lifting process, the pressure fluctuation of the hydraulic system is reduced, the comfort of a driver is improved and the visual field of the gantry is enlarged.

Description

technical field [0001] The invention belongs to the technical field of forklift masts, and in particular relates to a hydraulic pipeline system for forklift masts. Background technique [0002] The forklift full-free mast refers to the mast that has the function of keeping the inner mast still and keeping the height of the forklift unchanged when the fork carriage moves along the entire stroke of the inner mast. The two-section full-free mast generally adopts two rear lifting cylinders and one front lifting cylinder. The front lifting cylinder is used to control the full free lifting stroke of the mast through the movable pulley, and the rear lifting cylinder is used to directly push the inner mast. Full free lifting stroke, its structure is as follows figure 2 As shown, it is composed of the left rear lifting cylinder 1, the front lifting cylinder 2, the fork frame 3, the inner mast 4, the outer mast 5, and the right rear lifting cylinder 6. The hydraulic principle diagram...

AI Technical Summary

Problems solved by technology

Such a system, under a certain flow rate, will cause the speed of the full free lifting stroke to be much lower than the lifting speed of the non-full free lifting stroke, and the lifting speed of the entire mast is inconsistent, transitioning from the full free lifting section to the non-full lifting stroke. There are also large hydraulic fluctuations in the free lifting section

Secondly, the larger the bore of the front lifting cylinder, the more difficult it is to process the cylindricity of the inner wall of the cylinder, the higher the processing cost, and it will also affect the vision of the mast

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