A multi-stage telescopic hydraulic cylinder with staged independent extension and synchronous retraction

Abstract

The invention discloses a multi-stage telescopic hydraulic cylinder with the functions of graded independent stretching and synchronous shrinking, and belongs to the technical field of hydraulic cylinders. The multi-stage telescopic hydraulic cylinder comprises a cylinder barrel, a primary hollow piston rod, a secondary hollow piston rod, a first-level core pipe, a second-level core pipe, a third-level core pipe and a fourth-level core pipe, all of which are sequentially sleeved from outside to inside. The respective independent stretching functions of two levels of cylinders can be achieved,oil comes in through a primary oil inlet and a secondary oil inlet in an earring body, different pressures are introduced, driving force with different magnitudes can be output, and stretching positioning of different positions is achieved; and meanwhile the four levels of core pipe structures are arranged inside and used for achieving synchronous shrinking of the primary hollow piston rod and thesecondary hollow piston rod. The structure is novel, multiple functions are integrated, the requirements of a system on oil ways are lowered, the number of auxiliary parts is reduced, meanwhile, thepurposes of saving energy and reducing consumption are achieved, the occupied space is reduced, the weight is reduced, and the requirements of integration and low weight of the hydraulic cylinders aremet.

Description

technical field [0001] The invention relates to the technical field of hydraulic cylinders, in particular to a multi-stage telescopic hydraulic cylinder with staged independent extension and synchronous retraction. Background technique [0002] As the executive element of the hydraulic system, the hydraulic cylinder converts the oil pressure into power, and has the characteristics of flexible action and force transmission. Cranes are widely used in construction machinery. The most commonly used five-arm truck cranes on the market at present, the extension and retraction functions of each arm are based on two vertically arranged vertically arranged in the main arm. Hydraulic cylinders are realized. The upper and lower cylinders realize mutual action through the pulley block, and the synchronization between the two cylinders is realized through the external oil circuit. [0003] Its problems are: [0004] 1. The synchronous retraction performance of the upper and lower cyli...

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Problems solved by technology

[0004] 1. The synchronous retraction performance of the upper and lower cylinders is not good, and the synchronization between the two cylinders can only be realized through the external oil circuit. Affected by the pressure difference and pressure loss, the synchronization stability fluctuates greatly;

[0005] 2. The two cylinders are placed side by side in the vertical direction, and the upper cylinder slides on the lower cylinder through the pulley. Collision and jamming between the pulley and the external oil pipe of the cylinder often occur, which brings potential safety hazards;

[0006] 3. The external oil circuit and pulley block take up a lot of space and increase the overall weight of the main boom of the crane

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