Telescopic arm device and automobile crane

Abstract

The invention provides a telescopic arm device and an automobile crane. The telescopic arm device comprises a first section arm, as well as a second section arm, a third section arm, a fourth section arm, a fifth section arm and a sixth section arm which are sequentially arranged in the first section arm in a sleeving manner, and further comprises a first telescopic cylinder, a first expansion arm wheel, a first expansion arm stay rope, a second telescopic cylinder, a second expansion arm wheel, a second expansion arm stay rope, a first contraction arm wheel and a first contraction arm guy rope, wherein a third telescopic arm wheel is mounted at the tail part of the fifth section arm; a fourth telescopic arm wheel is mounted at the root part of the sixth section arm; one end of the third telescopic arm stay rope is connected with the root part of the third section arm; the third telescopic arm wheel and the fourth telescopic arm wheel are sequentially arranged in the middle of the third telescopic arm stay rope in a surrounding manner; the other end of the third telescopic arm stay rope is connected with the tail part of the fifth section arm; a second contraction arm wheel is mounted at the tail part of the third section arm; a third contraction arm wheel is mounted at the root part of the fourth section arm; one end of a second contraction arm stay rope is connected with the root part of the fourth section arm; the second contraction arm wheel and the third contraction arm wheel are sequentially arranged in the middle of the second contraction arm stay rope in a surrounding manner; and the other end of the second contraction arm stay rope is connected with the sixth section arm. The telescopic arm device is compact in structure and easy to assemble.

Description

technical field [0001] The invention relates to the field of telescopic structures, more specifically, to a telescopic arm device 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. The telescopic boom mainly has two forms: the cylinder rope row type and the single cylinder bolt type. Considering the cost and related manufacturing technology, most of the products with a capacity of 100 tons or less currently adopt the more mature five-section boom and the synchronously telescopic telescopic boom below, and The inside of the telescopic arm adopts an oil cylinder rope row type telescopic mechanism. However, with the increasingly fierce market competition, the hoisting performance and hoisting heigh...

AI Technical Summary

Problems solved by technology

[0008] An object of the present invention is to provide a telescopic arm device to solve the problem that the six-section boom telescopic device in the prior art has a large volume and a heavy weight, which increases the production cost and affects its own lifting performance.

Images