A boom device and construction machinery

Abstract

The invention discloses a boom device and an engineering machine. The boom device comprises a first boom, a second boom, a third boom, a fourth boom, a fifth boom and a sixth boom which are hinged in sequence, wherein the first boom, the second boom and the third boom are folded to be R-shaped when the boom device is in a folded state; the third boom, the fourth boom and the fifth boom are folded to be Z-shaped; the sixth boom is folded below the third boom. The boom device disclosed by the invention is compact in folding structure and high in space utilization rate, and a space for folding arrangement of a multi-section boom is provided, so that the total length of the boom device is increased, and the flexibility of material allocation of the booms is improved.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to a boom device and construction machinery. Background technique [0002] Concrete pump trucks are used to transport concrete along pipelines to the required locations for construction projects. The concrete pump truck needs to transport the concrete to the designated position through the delivery pipe fixed on the boom device, and as the delivery position changes, the boom device needs to drive the delivery pipe to realize the actions of unfolding, folding and rotating. [0003] In the prior art, the boom device of the concrete pump truck generally includes a multi-section boom, and each section of the boom can be folded. The folding methods used by the boom device mainly include R-type, Z-type and RZ-type overall folding methods (for boom devices with more than five arms, the RZ-type folding method is basically used). figure 1 It is a schematic diagram of the fol...

AI Technical Summary

Problems solved by technology

The length of the fifth boom 6 and the sixth boom 7 is limited

At the same time, the length of the fourth boom 5 is relatively long, which makes its manufacturing process more difficult, and it is easy to deform during use.

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