A single-drive telescopic hydraulic cylinder based on a coreless tube

Abstract

The invention discloses a single-drive telescopic hydraulic cylinder based on a coreless tube. Including cylinder barrel, piston rod, piston, gland, guide sleeve and cylinder arm pin interlock structure; the oil inlet pipe and oil return pipe are installed in the piston rod; the oil inlet pipe is connected to the rodless cavity oil port A and the rodless cavity, and the oil return pipe is connected There is a rod cavity oil port B and a rod cavity; the bottom of the cylinder barrel is installed with an oil pipe seat; an outer oil pipe connected to the oil passage of the oil pipe seat is fixed outside the cylinder barrel; the front end of the cylinder barrel is installed with a front cavity oil pipe joint connected to the rod cavity; A valve bracket is installed outside the cylinder barrel, and a control valve for controlling the interlocking structure of the cylinder arm pin is installed on the valve bracket; the A port of the control valve is connected to the outer oil pipe, and the B port of the control valve is connected to the front cavity oil pipe joint. The invention does not need complex structural design inside the piston rod, and realizes the driving single-cylinder plug-in structure inside the hydraulic cylinder with a small cylinder diameter and rod diameter; the processing difficulty and cost of the piston rod are reduced, and the space occupied by the inner core tube of the piston rod is reduced. , reduce weight and achieve lightweight requirements.

Description

technical field [0001] The invention relates to the field of hydraulic equipment, in particular to a single-drive telescopic hydraulic cylinder based on a coreless tube. Background technique [0002] Single-cylinder bolt-type telescopic oil cylinders are generally used in truck cranes and all-terrain cranes above 100 tons, and are suitable for mobile cranes for large-scale hoisting projects. The single-cylinder bolt-type telescopic boom crane is one of the large-tonnage cranes. There is only one telescopic cylinder in the telescopic boom. The front end of the telescopic cylinder is provided with a single-cylinder bolt-cylinder arm-pin interlock structure, which is driven by the telescopic cylinder. Structure, so as to realize the extension and retraction of the boom; retraction, single-cylinder pin, cylinder arm pin interlock structure, the oil supply method adopts the power source to drive the pressure through the mobile core tube built in the piston rod of the telescopic c...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of the development of multi-section booms with small cross-sections, improve the lightweight level of the whole machine, and improve the hoisting weight and load efficiency, the present invention provides a single-drive telescopic hydraulic cylinder based on a coreless tube.

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