Telescopic device of arm frame, arm frame and engineering machinery

Abstract

The invention discloses a telescopic device of an arm frame. The arm frame comprises a first knuckle arm (1), a second knuckle arm (2) and a third knuckle arm (3); the telescopic device of the arm frame comprises multi-level telescopic hydraulic cylinders, a first guide pulley (10), a first guide element (11), a second guide pulley (18) and a second guide element (17), wherein the multi-level telescopic hydraulic cylinders is used for stretching the knuckle arms of the arm frame; the first guide element (11) is wound on the first guide pulley (10); the second guide element (17) is wound on the second guide pulley (18); in addition, the invention further discloses the arm frame and engineering machinery. According to the telescopic device of the arm frame, because the multi-level telescopic hydraulic cylinders are adopted to drive a plurality of knuckle arms simultaneously, and the guide pulleys and the guide elements enabling the telescopic speeds of the knuckle arms to be consistent are mounted on the knuckle arms, and the synchronization telescope of the knuckle arms of the arm frame can be achieved.

Description

technical field [0001] The invention relates to a telescopic device of a boom, a boom equipped with the telescopic device of the boom and a construction machine including the boom. Background technique [0002] The telescopic boom is an important component of construction machinery such as aerial work vehicles, fire rescue vehicles, and truck cranes. It plays an important role in carrying and transporting people and objects to a certain operating height. Among them, the expansion and contraction mode of the telescopic boom has an important influence on the performance of construction machinery such as aerial work vehicles, fire rescue vehicles, and truck cranes. [0003] In the prior art, the telescoping method of more than 5 booms is usually a single-cylinder latch mechanism to telescopic each boom in turn. The defect of this telescopic method is that it takes a lot of time and seriously affects construction machinery, especially high-altitude operations. The use efficienc...

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Problems solved by technology

[0003] In the prior art, the telescoping method of more than 5 booms is usually a single-cylinder latch mechanism to telescopic each boom in turn. The defect of this telescopic method is that it takes a lot of time and seriously affects construction machinery, especially high-altitude operations. Utilization efficiency of vehicles and fire rescue vehicles

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