Connecting device and telescopic arm frame and construction machinery using the telescopic arm frame

Abstract

The invention discloses a connecting device used for connecting a first piece to be connected and a second piece to be connected. The connecting device comprises a body. The body is provided with a first connecting portion which is connected with the first piece to be connected in a pivotal mode, and a second connecting portion which is connected with the second piece to be connected in a pivotal mode. The second connecting portion is arranged in the mode of deviating from the pivot-joint axis of the first connecting portion. The connecting device further comprises a locating part used for fixing the circumferential position of the first connecting portion and the first piece to be connected. Based on the connecting device, the invention further provides a telescopic arm frame and an engineering machine applying the telescopic arm frame.

Description

technical field [0001] The invention relates to the technical field of machinery, in particular to a connection device, a telescopic arm frame and construction machinery using the telescopic arm frame. Background technique [0002] The elevating fire truck is a fire-fighting operation vehicle equipped with a fire-extinguishing device and an elevating device. The fire-fighting personnel can be transported to high altitude through the installed lifting arm to carry out the fire-fighting tasks of high-altitude fire extinguishing and fire rescue. For elevating fire trucks, the telescopic arm is one of the main components for this type of fire truck to achieve fire fighting tasks. [0003] Usually, the telescopic boom is formed by nesting multi-section box-shaped booms, and uses oil cylinders and leaf chains to provide power to realize extension and retraction. Based on the working performance of the telescopic boom, it is necessary to meet the effective connection between the t...

AI Technical Summary

Problems solved by technology

This connection method needs to reprocess the nylon slider, and the assembly work efficiency is low. Moreover, the nylon slider realizes the expansion and contraction between the two boom tubes through sliding friction, and the friction force is relatively large, which affects the smooth expansion and contraction of the telescopic arm when it is working. In particular, it restricts the working performance of the telescopic arm of the high-meter-number fire truck

[0006] However, for the way of using the roller structure to connect the two-section arm tubes of the adjacent telescopic arms, although the rolling friction can be used to achieve smoother telescopic movements, but because the surface of the roller structure has been treated, the hardness is relatively high, and the assembly process , it is very difficult to reprocess the surface and structure of the roller

Therefore, when the idler is processed to adjust the assembly gap between the applicable two-section arm barrels, it is easy to damage the arm barrel or the idler

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