Cylinder set for use in retraction mechanism

Abstract

A cylinder group for adjustable structures is rigidly attached to the cylinder body, compactly conformed, solving the arrangement difficulty of hydraulic pipelines and improving the set reliability. The cylinder group comprises a No.1 cylinder body and a No.2 cylinder body inside an adjustable structure.

Description

technical field [0001] The invention relates to a drive device for a telescopic mechanism of a travelable working machine, in particular to an oil cylinder group used for the telescopic mechanism, in particular to an oil cylinder group used for the multi-stage outrigger telescopic device of a concrete pump truck. Background technique [0002] At present, telescopic mechanisms are often used in travelable working machines. For example, when a concrete pump truck stops driving and enters the construction state, a multi-stage telescopic arm is used to control the position of the legs so that the entire working machine can be supported stably. There are many ways to drive the multi-stage telescopic boom, and the most common ones are driven by oil cylinders. Method 1, using a single oil cylinder to drive; Method 2, using two separate oil cylinders, each driving a first-stage telescopic arm, and the oil ports are connected in parallel; Method 3, using a multi-stage oil cylinder to...

AI Technical Summary

Problems solved by technology

The disadvantage of method one is that the expansion and contraction length of the telescopic mechanism is short and the support strength is not enough; the disadvantage of method two is that the oil pipes need to be connected to two separate oil cylinders respectively, and the oil pipe of at least one of the oil cylinders will move back and forth with the movable arm, so that the oil pipes The oil pipe is damaged due to friction with the telescopic arm, which makes the layout of the hydraulic pipeline very difficult; the defect of the third method is that when the multi-stage oil cylinder is used for driving, the outer diameter of the oil cylinder is too large, and the telescopic stroke of each stage oil cylinder is inconsistent , limited by the size of the telescopic arm, the overall structure of the telescopic arm is affected, the layout adjustment is very difficult, and the layout of the hydraulic pipeline is very complicated; at the same time, the driving force to push the telescopic arm is provided by the smallest oil cylinder in the multi-stage oil cylinder, and the driving force is not enough. When an abnormality occurs When stuck, the telescopic arm cannot be pushed out. If the driving force is increased by continuously increasing the system pressure, it will affect the safety of the hydraulic pipeline

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