Synchronous telescoping mechanism and autocrane

Abstract

The invention provides a synchronous telescoping mechanism and an autocrane. The synchronous telescoping mechanism comprises an external knuckle arm, an internal knuckle arm arranged in the external knuckle arm in a sleeving manner, at least one middle arm arranged between the external knuckle arm and the internal knuckle arm in a sleeving manner, a first winding barrel, an arm extension rope, a first driving device, a second winding barrel, an arm contraction rope and a second driving device, wherein a first pulley is arranged at an arm head of the external knuckle arm; second pulleys are arranged at arm tails of the middle arms; third pulleys are arranged at arm heads of the middle arms; when the first winding barrel rotates to take up the arm extension rope, the second winding barrel rotates to pay off the arm contraction rope; and when the first winding barrel rotates to pay off the arm extension rope, the second winding barrel rotates to take up the arm contraction rope. The synchronous telescoping mechanism reduces the deadweight of a telescoping arm, and can improve hoisting performances of the autocrane.

Description

technical field [0001] The invention relates to the telescopic technical field, and more specifically, to a synchronous telescopic mechanism and a truck crane. Background technique [0002] The telescopic boom is the core component of the truck crane, and it is also the most important load-bearing structural part of the truck crane in the hoisting operation. The weight, strength and stiffness of the telescopic boom will directly affect the performance of the truck crane. There are mainly two types of telescopic booms: the cylinder rope row type and the single cylinder bolt type. Considering the cost and related manufacturing technology, most of the small and medium tonnage truck cranes currently use the oil cylinder rope row type telescopic mechanism. [0003] The telescopic arm adopting the cylinder rope-type telescopic mechanism needs at least one telescopic oil cylinder arranged inside the arm barrel, which can be extended and retracted along the extension direction of th...

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Problems solved by technology

[0003] The telescopic arm adopting the cylinder rope-type telescopic mechanism needs at least one telescopic oil cylinder arranged inside the arm barrel, which can be extended and retracted along the extension direction of the arm barrel. For the telescopic cylinders that extend in the direction of extension, for the telescopic arms of truck cranes with a tonnage of 50 tons and above, the mass of each telescopic cylinder used is even more than one ton, so the weight and cost of the telescopic booms of truck cranes remain high. , affecting the lifting performance of the truck crane

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