Single rod and rough symmetric double actuating surfaces hydraulic cylinder with internal displacement sensor

Abstract

A hydraulic cylinder has a double actuating piston structure. One end of the inner piston is fixed on the bottom of the cylinder. A piston ring is fixed on its other end. A movable element having an inner hole is taken as the cylinder of the inner piston. Another piston ring is fixed at one end of the movable element on its outer surface. The movable element is located between the inner piston and the cylinder. A displacement sensor is engaged with the movable element and the inner piston. Its main body is fixed on the shoulder of the movable element. Its slide sleeve is fixed on the top end of the inner piston. The fits, between the pistons and cylinders and between the displacement sensor and the inner piston, are of sealed slide. The chamber(A) is formed by the cylinder, the movable element, the inner piston and the bottom of the cylinder, with the opening (a) leading to outer oil path. The chamber(B) is formed by the cylinder, the movable element and the end cap of the cylinder, with the opening (b) leading to outer oil path. The chamber T is formed by the movable element and the inner piston, with the opening T leading to atmosphere. The both piston-cylinder structures have approximately equal working areas. The cylinder has a single output rod, buffering ability at its two ends, an inner displacement sensor, a long working length and high stability. It combines symmetric hydraulic cylinder with single output rod cylinder, and can be used widely.

Description

technical field [0001] The invention relates to a fluid pressure actuator, in particular to a nearly symmetrical hydraulic cylinder with a single-outlet rod and double-acting surfaces with a built-in displacement sensor. Background technique [0002] A hydraulic cylinder is an actuator that converts hydraulic energy into mechanical energy for linear motion. Symmetrical hydraulic cylinders refer to double-acting hydraulic cylinders with the same two active surfaces. Existing symmetrical hydraulic cylinders are generally double-rod hydraulic cylinders, while single-rod hydraulic cylinders have unequal two active areas and are asymmetrical cylinders. In the past, it was also proposed that the single-rod and double-acting surfaces are approximately symmetrical hydraulic cylinders, one of which is on the inner piston rod (or inner cylinder). When the hydraulic cylinder is working, the inner piston rod (or inner cylinder) bears a large force. Pressure, when the stroke of the hydr...

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Problems solved by technology

In the past, it was also proposed that the single-rod and double-acting surfaces are approximately symmetrical hydraulic cylinders, one of which is on the inner piston rod (or inner cylinder). When the hydraulic cylinder is working, the inner piston rod (or inner cylinder) bears a large force. Pressure, when the stroke of the hydraulic cylinder is very long, in order to ensure the structural stability of the hydraulic cylinder, the inner piston rod (or inner cylinder) of the hydraulic cylinder must be made very thick, so that when the piston rod moves, the flow rate of the system is relatively large. Large, the flow and stability of this hydraulic cylinder are contradictory

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