Multi-section arm telescopic device and crane with same

Abstract

The invention provides a multi-section arm telescopic device and a crane with the same. The multi-section arm telescopic device comprises a single cylinder bolt part and a rope row part; the single cylinder bolt part comprises m section arms, a telescopic oil cylinder driving a pth section arm to stretch, and an arm pulling mechanism and a cylinder bolt mechanism which are used for positioning the p-th section arm, wherein m and p are natural numbers and p is more than 1 and less than or equal to m; the rope row part comprises a (m+1)th section arm to an nth section arm; an arm stretching rope row for the qth section arm comprises an arm stretching rotating wheel for the qth section arm and an arm stretching guy cable for the qth section arm, a first end of the arm stretching guy cable isfixed at the bottom of a (q-2)th section arm and a second end of the arm stretching guy cable is fixed at the bottom of the qth section arm; an arm contracting rope row for the qth section arm comprises an arm contracting rotating wheel for the qth section arm; and the first end of an arm stretching guy cable for the qth section arm is fixed on the top of the (q-2)th section arm, the second end of the arm stretching guy cable is fixed at the bottom of the qth section arm and passes by an arm contracting rotating wheel for a (q-1)th section arm. The multi-section arm telescopic device has hightelescopic speed and high work efficiency.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a multi-section boom telescopic device, and also relates to a crane with the multi-section boom telescopic device. Background technique [0002] The single-cylinder plug-in technology is generally adopted by large-tonnage cranes. This device is driven by a telescopic oil cylinder. The cylinder barrel of the telescopic oil cylinder has a cylinder pin and a plug-in device. connection to achieve scaling. Since each section of the telescopic boom in this device is extended and retracted section by section, and the extension and retraction of each section of the arm needs to be realized by the cylinder and the arm pin plugging action, therefore, its expansion and contraction speed is relatively slow, which affects the stability of the crane. work efficiency. [0003] The rope row technology is generally adopted for small-tonnage cranes. The main advantages are fast exp...

AI Technical Summary

Problems solved by technology

[0006] The cylinder is fixedly connected to the outermost section arm of the rope row, and the top of the end of the cylinder is also equipped with a first outrigger runner. The structure is relatively complicated, and it is difficult to realize the expansion and contraction of the boom with more than 5 sections under the condition of a single cylinder.

[0007] Before the fully retracted state to the rapid extension of the rope mechanism and from the fully extended state to the rapid retraction of the rope mechanism, it is necessary to first perform the telescopic action between the basic arm and the second section arm through the telescopic cylinder (Need to insert or unpin the external arm pin between the basic arm and the second section arm), resulting in affecting the telescopic speed of the multi-section arm and low work efficiency

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