Short-stroke pressure-maintaining high-pressure heavy hydraulic cylinder with high-pressure proximity switches

Abstract

The invention relates to a short-stroke pressure-maintaining high-pressure heavy hydraulic cylinder with high-pressure proximity switches, which comprises a cylinder barrel and a piston rod assembled in the cylinder barrel. The front end and the back end of the cylinder barrel are respectively provided with a cylinder head and a cylinder bottom, the center of the cylinder head is provided with a cylinder head through hole, the piston rod penetrates through the cylinder head through hole, the piston rod is cooperated with the cylinder head through hole in a sealed sliding mode, and the inner end of the piston rod is provided with a piston. The invention is characterized in that a first circumferential boss and a second circumferential boss are formed on the piston rod at the both sides of the piston, the cylinder head is provided with a first proximity switch, and the first circumferential boss of the piston rod is overlapped with the induction end of the first proximity switch in a non-contact mode when entering a cavity of the cylinder head; the cylinder bottom is provided with a second proximity switch, and the second circumferential boss of the piston rod is overlapped with the induction end of the second proximity switch in a non-contact mode when entering a cavity of the cylinder bottom. The invention has compact and reasonable structure, small occupied space and long service life; pressure-maintaining locking can be realized, and thus, the safety is high.

Description

technical field [0001] The invention belongs to the technical field of hydraulic equipment, and relates to an improvement of a hydraulic cylinder, in particular to a short-distance pressure-maintaining high-pressure heavy-duty hydraulic cylinder with a high-pressure proximity switch capable of accurately detecting the position and speed of a piston rod. Background technique [0002] A hydraulic cylinder is a device that converts hydraulic energy into mechanical energy and enables the machine to achieve reciprocating linear motion or swing. Its transmission works smoothly and has high reliability. Due to the increasing complexity of actual work requirements and the higher and higher requirements for hydraulic cylinder control accuracy, the existing ordinary hydraulic cylinders can no longer fully meet the production needs, resulting in low production efficiency; and they do not have safety protection functions. Poor sex. In order to meet the actual requirements, travel switc...

AI Technical Summary

Problems solved by technology

[0003] At present, travel switches or proximity switches are usually set outside the hydraulic cylinder, which not only takes up space, but also is easily affected by the surrounding working environment, such as oil stains, solutions, and dust pollution

In addition, due to the vibration of the piston rod during operation, the repeated positioning accuracy gradually deteriorates, and it is difficult to accurately control the operating limits at both ends of the hydraulic cylinder, which gradually fails to meet the requirements of automatic control.

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