Telescopic control valve, multi-oil-cylinder sequential telescopic control mechanism and multi-oil-cylinder driving device

Abstract

The invention discloses a telescopic control valve, a multi-oil-cylinder sequential telescopic control mechanism and a multi-oil-cylinder driving device. The multi-oil-cylinder driving device comprises a first-stage oil cylinder and a second-stage oil cylinder, a mechanical touch switch is installed on the first-stage oil cylinder, and an adjustable touch pin is installed on the second-stage oil cylinder; and when the piston rod of the second-stage oil cylinder extends to a set position, the adjustable touch pin touches the mechanical touch switch, and the mechanical touch switch cuts off hydraulic oil of a rodless cavity of the first-stage oil cylinder. The multi-oil-cylinder sequential telescopic control mechanism has the advantages that the structure is reasonable, the reliability of atelescopic arm is effectively improved, and the machining difficulty of an arm frame and the oil cylinder is not required to be increased.

Description

technical field [0001] The invention relates to the technical field of boom-type telescopic mechanisms of engineering machinery, in particular to a telescopic control valve, a multi-cylinder sequential telescopic control mechanism and a multi-cylinder driving device. Background technique [0002] The present invention is a product invented after studying the advantages and disadvantages of boom telescopic mechanisms at home and abroad. Commonly used mechanisms for boom telescoping are single oil cylinder drive, oil cylinder with steel wire rope, oil cylinder sequential telescopic drive or single cylinder latch. [0003] The existing boom telescopic mechanisms at home and abroad mainly have the following problems: 1. The single-cylinder driven telescopic method can only telescopically extend one section of the boom, and the working radius is small; Big and heavy; 3. The existing sequential telescopic type adopts sequence valves, which require a certain pressure to open and hi...

AI Technical Summary

Problems solved by technology

[0003] The existing boom telescopic mechanisms at home and abroad mainly have the following problems: 1. The single-cylinder driven telescopic method can only telescopically extend one section of the boom, and the working radius is small; Big and heavy; 3. The existing sequential telescopic type adopts sequence valves, which require a certain pressure to open and high energy consumption. 4. The single-cylinder bolt technology requires precision and high manufacturing costs.

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