Folding jib type lorry-mounted crane multi-cylinder sequential telescopic hydraulic system

Abstract

The invention discloses a folding jib type lorry-mounted crane multi-cylinder sequential telescopic hydraulic system, and relates to the field of engineering, in particular to the folding jib type lorry-mounted crane multi-cylinder sequential telescopic hydraulic system. The folding jib type lorry-mounted crane multi-cylinder sequential telescopic hydraulic system which is compact in structure andstable is proposed. The system involves a first hydraulic cylinder, a first central pipe, a primary two-position two-way reversing valve, a first one-way valve, a second hydraulic cylinder and a three-position four-way reversing valve, wherein one end of the first central pipe is fixedly connected with the bottom of a cylinder body of the first hydraulic cylinder, the other end of the first central pipe extends into a central hole I of a first piston rod of the first hydraulic cylinder and is connected with the first piston rod in a sliding seal mode, and the first central pipe and another first central pipe are hollow pipe bodies with one ends closed. The system has the characteristics of being compact in structure, stable and the like.

Description

technical field [0001] The invention relates to the field of engineering knots, in particular to a multi-cylinder sequential telescopic hydraulic system for a knuckle-arm type truck-mounted crane. Background technique [0002] At present, the telescopic mode of the boom of the folding-arm truck-mounted crane is mostly synchronous telescopic telescopic, but with the gradual development of the truck-mounted crane, the number of boom sections is increasing, and synchronous telescopic telescopic is no longer the best telescopic method. With the development of the market and technology, sequential telescopic expansion has gradually become the mainstream telescopic method of multi-section arm folding boom truck-mounted cranes. At present, the domestic sequential telescopic hydraulic system mainly realizes the sequential telescopic function through one-way sequential valves, but with the number of booms The number of corresponding one-way sequence valves will increase, which will c...

AI Technical Summary

Problems solved by technology

[0002] At present, the telescopic mode of the boom of the folding-arm truck-mounted crane is mostly synchronous telescopic telescopic, but with the gradual development of the truck-mounted crane, the number of boom sections is increasing, and synchronous telescopic telescopic is no longer the best telescopic method. With the development of the market and technology, sequential telescopic expansion has gradually become the mainstream telescopic method of multi-section arm folding boom truck-mounted cranes. At present, the domestic sequential telescopic hydraulic system mainly realizes the sequential telescopic function through one-way sequential valves, but with the number of booms The number of corresponding one-way sequence valves will increase, which will cause the system pressure to be too high. At the same time, the sequential expansion and contraction mode of this pressure control is not stable.

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