Support leg device for engineering machinery and concrete pump truck

Abstract

A leg device for engineering machinery comprises a swinging leg (21) hinged to an engineering machinery chassis (10), a telescopic driving device (25) and a connecting rod mechanism (27) disposed between the swinging leg (21) and the telescopic driving device (25). The connecting rod mechanism (27) is used to transfer a driving force generated by the telescopic driving device (25) to the swinging leg (21), so as to drive the swinging leg (21) to swing with respect to the chassis (10). Also a concrete pump truck.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an outrigger device for engineering machinery and a concrete pump truck with the outrigger. Background technique [0002] Construction machinery such as concrete pump trucks and truck cranes often need to be supported by outriggers during work to avoid overturning of the construction machinery due to excessive load during operation. The outriggers usually include two front outriggers and two rear outriggers. Legs, each outrigger has two states of stowed and unfolded. When the construction machinery needs to move, the outriggers need to be retracted for easy movement; when the construction machinery needs to be operated, the outriggers need to be expanded for support. [0003] figure 1 A outrigger device 40 of a concrete pump truck is shown, and the outrigger device 40 includes two swinging front outriggers 41 and two swinging rear outriggers 43 hinged on the rotary base 30 ...

AI Technical Summary

Problems solved by technology

However, with a single cylinder structure, the stroke of the cylinder is long, and the mechanical design is not reasonable, and the cylinder needs a lot of force to push the outrigger; especially when the size of the pump truck is large and the stroke is long, the use of this structure is even more insufficient. Specifically, it includes the following points:

[0004] 1. After the outriggers are deployed and reset, the oil cylinder takes up a lot of space. If there is not enough space on the side of the pump truck, it will affect the size of the entire pump truck;

[0005] 2. It takes a long oil cylinder to reach the designed deployment angle, and the larger the size of the pump truck, the longer the stroke of the oil cylinder is required; the manufacturing and maintenance costs of the oil cylinder with a long stroke are high;

[0006] 3. A single cylinder requires a lot of cylinder force to push the outrigger. In order to provide a large cylinder force, the size of the cylinder needs to be increased, the volume of the cylinder increases, and the manufacturing cost increases; and it will increase the weight of the entire pump truck

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