Double acting piston hydraulic cylinder

Abstract

The invention discloses a double-acting piston cylinder, and relates to a hydraulic element. A plurality of distance rings are arranged in an inner cavity of a piston rod evenly, peripheries of the distance rings are welded on the inner wall of the piston rod or connected with the inner wall of the piston rod through threads, and an oil hole is reserved at the center of each distance ring. By the aid of a differential method and local enhancement, force is transferred onto the distance rings, force acting distance is shortened greatly, local cross sectional moment of inertia of the piston rod is increased, bending resistance of the piston rod is improved, radial dimension of the piston rod is decreased effectively, oil inlet pressure of oil ports is reduced greatly, and energy consumption is reduced. In addition, oil pressure is acted on a piston shaft along the radial direction, compensation action on sealing on the piston is achieved, and internal leakage amount of an oil cylinder can be decreased.

Description

technical field [0001] The invention relates to a hydraulic component, in particular to a double-acting piston hydraulic cylinder with low energy consumption and low internal leakage used in petrochemical, water conservancy, machine tools, engineering machinery and construction machinery. Background technique [0002] Oil cylinders are widely used in petrochemical, water conservancy, machine tools, construction machinery and construction machinery technology fields, and play a vital role as an actuator for linear motion of objects. And with the development of large-scale machine tools and construction projects, oil cylinders are also increasingly developing in the direction of large-scale. In the double-acting piston hydraulic cylinder currently used, the pressure at the upper end acts on the round hole of the piston rod upper cover, and the pressure at the lower end acts on the bottom of the piston. The distance between the upper and lower pressures is relatively far, and t...

AI Technical Summary

Problems solved by technology

In the double-acting piston hydraulic cylinder currently used, the pressure at the upper end acts on the round hole of the upper cover of the piston rod, and the pressure at the lower end acts on the bottom of the piston. The distance between the upper and lower pressure is relatively long, and the piston rod is easily bent.

In order to ensure the stability of the piston rod, the diameter of the piston rod must be increased, which directly leads to the area of ​​the cylinder cavity πD 2 / 4 and the area of ​​the annular cavity formed by the inner cavity of the cylinder and the outer cavity of the piston rod π (D 2 -d 2 ) / 4 ratio becomes larger, the oil cylinder enters the oil from the upper inlet and outlet, and when the piston rod retracts, the pressure will be greatly increased and the energy consumption will be greater

[0003] In addition, when the one-way sealing ring on the piston moves for a long time, the leakage will increase. When the oil cylinder supports a heavy object or tightens the workpiece to be processed, if the oil cylinder leaks internally, the heavy object will directly fall from the sky Or the workpiece flies out directly, causing irreparable losses

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