Single cylinder synchronous expansion and contraction device with multiple sets of inhaul cables for lorry-mounted crane

Abstract

The invention discloses a single cylinder synchronous expansion and contraction device with multiple sets of inhaul cables for a lorry-mounted crane. The device comprises a basic arm and a plurality of telescopic arms which are overlapped and sleeved in the basic arm; a telescopic oil cylinder of which the head is fixed on the tail of the basic arm and the barrel is fixed on a first section of the tail of the telescopic arm is arranged in each of the plurality of telescopic arms; the arm body of each telescopic arm is provided with a pulley, a telescopic arm cable, and a fixed plate; a rope row is arranged in each telescopic oil cylinder; and synchronous extending or contraction of multiple sections of the telescopic arms can be realized by the connection relationship of the parts, and the operation characteristics that the conventional arm can be only extended and contracted sequentially are changed to ensure that the multiple sections of the telescopic arm bodies are extended and contracted synchronously along with the extension and contraction of the inbuilt telescopic cylinders, so that the extension and contraction speed of the arm bodies and the efficiency of the lifting operation are improved greatly. The single cylinder synchronous expansion and contraction device with the multiple sets of inhaul cables for the lorry-mounted crane has a compact structure, the mode of winding steel wire ropes is skilful, the space in the arm body is fully utilized, and the problems that the conventional five-section telescopic arm expansion and contraction system for the lorry-mounted crane is implemented by arranging two inbuilt telescopic oil cylinders are solved.

Description

technical field [0001] The invention relates to a single-cylinder arm body expansion device, in particular to a single-cylinder arm body synchronous expansion device with multiple sets of pull cables, which is suitable for truck-mounted cranes. Background technique [0002] There are two main telescopic devices for the arm body of truck-mounted cranes currently in use: the first one consists of several external or built-in telescopic oil cylinders placed outside or inside the arm body to push the telescopic arm body to move. This device is more suitable for folding Boom truck-mounted cranes are not suitable for straight-arm truck-mounted cranes with large-tonnage three-section telescopic booms or more due to limitations in installation space, arm length, and their own weight. The second type is to use two or three built-in telescopic oil cylinders and a rope mechanism to drive several arms to expand and contract. The expansion and contraction sequence is that the first secti...

AI Technical Summary

Problems solved by technology

This kind of telescopic arm needs to use two or three built-in telescopic oil cylinders, so it brings about a large cross-sectional size of the boom body, complex internal structure, heavy boom assembly, fast decay of crane lifting capacity, high cost, and high cost. Body expansion and contraction can only be performed sequentially, so the speed of arm body expansion and contraction is slower than that of synchronous expansion, and the lifting efficiency of the truck-mounted crane is low

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