Ultra-low and large tonnage truck-mounted crane

Abstract

The invention discloses an ultralow large-tongue lorry-mounted crane and belongs to the technical field of lorry-mounted cranes or truck cranes. In order to solve the technical problem, the invention provides an ultralow large-tongue lorry-mounted crane which is low in overall height and light in weight. The technical scheme adopted by the invention is as follows: the tail end of a lifting arm is hinged with the top of a stand column which is fixedly mounted on a rotation bearing; the lifting arm is of a hollow structure with a rectangular cross section; the bottom surface of one end, close to the stand column, of the lifting arm is opened; the bottom surface of the other end of the lifting arm is closed; the bottom end of a cylinder body of an amplitude-variable oil cylinder is hinged with the side surface of the bottom of the stand column; the end part of a piston rod of the amplitude-variable oil cylinder extends from an opening of the bottom of the lifting arm to the interior of the lifting arm and is hinged with the middle of the lifting arm; a hydraulic winch is mounted in one end, close to the stand column, of the lifting arm. According to the ultralow large-tongue lorry-mounted crane, a hinged point of the end part of the piston rod of the amplitude-variable oil cylinder and the lifting arm is arranged in the lifting arm; the hydraulic winch is also arranged in the lifting arm; the overall height is not limited by the sizes of the amplitude-variable oil cylinder and the hydraulic winch and can be designed to the lowest; the overall weight is reduced as part of material is saved.

Description

technical field [0001] The invention relates to an ultra-low and large-tonnage truck-mounted crane, which belongs to the technical field of truck-mounted cranes or truck cranes. Background technique [0002] The truck-mounted crane equipped for special vehicles requires low height and light weight; the existing technology adopts the luffing cylinder front and hinged with the bottom of the boom, and the hydraulic winch is arranged under the boom, such as image 3 As shown, this arrangement reduces the height of the whole machine compared with the rear of the luffing cylinder, but due to the structural size limitation of the luffing cylinder and the hydraulic winch, space must be reserved for the luffing cylinder and the hydraulic winch, and the height of the whole machine cannot be further reduced . Contents of the invention [0003] The invention overcomes the shortcomings of the prior art, and the technical problem to be solved is to provide an ultra-low and large-tonnage...

AI Technical Summary

Problems solved by technology

[0002] The truck-mounted crane equipped for special vehicles requires low height and light weight; the existing technology adopts the luffing cylinder front and hinged with the bottom of the boom, and the hydraulic winch is arranged under the boom, such as image 3 As shown, this arrangement reduces the height of the whole machine compared with the rear of the luffing cylinder, but due to the structural size limitation of the luffing cylinder and the hydraulic winch, space must be reserved for the luffing cylinder and the hydraulic winch, and the height of the whole machine cannot be further reduced

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