Telescopic component and support for engineering machinery and concrete pump vehicle with the support

Abstract

An extension component for the engineering plant, an extension landing leg formed by the component and a concrete-pump car are provided. The extension component includes a telescopic bushing component on which a helix mechanism and an arresting device are arranged. The helix mechanism contains a prime mover, a circular shaft and a hollow barrel. The circular shaft is connected with the hollow barrel via a thread or a middle hollow shaft group is arranged between the circular shaft and the hollow barrel, the middle hollow shaft group comprising a middle hollow shaft which has an internal thread and an outside thread. The both sides of the middle hollow shaft group are connected respectively with the circular shaft and the hollow barrel via the thread and the prime mover is connected withthe end of the circular shaft or the hollow barrel, the prime mover fixed on one end of the bushing component and the other end of the bushing component fixed and connected with the end of no prime mover in the helix mechanism. The extension part of the extension landing leg comprises the extension component and one end of the extension landing leg is provided with a supporting component while theother end is connected with a bracket on an underpan of the engineering plant. A supporting part of the concrete-pump car is provided with the extension landing leg. The invention has the advantagesof simple structure, convenient manufacture and low cost.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a telescopic assembly driven by a screw mechanism for construction machinery, a telescopic support leg formed by the assembly and a concrete pump truck with the telescopic support leg. Background technique [0002] Many construction machinery need to use supporting devices to realize the support during operation, the purpose of which is to avoid overturning caused by excessive operating load. Most of the existing support devices are legs that are deployed sideways and sideways, and each leg has two states of being folded and unfolded. When the construction machine needs to move, the outriggers are retracted for easy movement, and the outriggers in this state are called in the stowed position. When the mobile construction machine is in the construction state, the outriggers are deployed for support, and the outriggers in this state are called in the supporting position. The...

AI Technical Summary

Problems solved by technology

The defects in the prior art are: the structure of the multi-stage telescopic oil cylinder is complicated, the processing is difficult, the cost is high, and the layout of the oil delivery pipe of the oil cylinder is also relatively difficult. If a wire rope rope-retracting mechanism is used to drive it, it is necessary to drill holes in multiple places inside the legs for wiring. , complex structure, troublesome processing and layout

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