Rope row type telescopic boom mechanism and crane provided with same

Abstract

The invention discloses a rope row type telescopic boom mechanism. The rope row type telescopic boom mechanism comprises a plurality of telescopic booms which are embedded and sleeved in sequence and can relatively stretch out and draw back, wherein a part of the telescopic booms stretches out and draw back through telescopic cylinders, and each of the other telescopic booms can stretch out and drawn back through a group of stretch-out travel ropes, stretch-out pulleys, draw-back travel ropes and draw-back pulleys; one group of the stretch-out pulleys and the draw-back pulleys are arranged on the tail and the head of one telescopic boom respectively, and two ends of corresponding draw-back travel ropes and stretch-out travel ropes are connected to the previous telescopic boom and the next telescopic boom respectively; and the draw-back pulleys are arranged on inner circumferential walls of the tails of the telescopic booms. According to the rope row type telescopic boom mechanism, the draw-back pulleys are arranged on the inner circumferential walls of the telescopic booms, and corresponding subsidiary components such as travel rope seats of the draw-back travel ropes are positioned on the inner circumferential walls of the tails of the telescopic booms, and spaces at the tail ends of the telescopic booms are not occupied anymore, so that the structure is compact, the lapping length of the telescopic booms is obviously increased, the stretch-out and draw-back amplitude is enlarged, and the hoisting performance of the booms is improved. The invention also provides a crane comprising the rope row type telescopic boom mechanism.

Description

Technical field [0001] The invention relates to the technical field of engineering machinery, and in particular to a rope-type telescopic arm mechanism and a crane having the mechanism. Background technique [0002] At present, the telescopic mechanism of the crane's telescopic arm mainly has two types: oil cylinder plus rope row and single cylinder latch. Five-section boom boom generally adopts double cylinder plus rope row mechanism. [0003] like figure 1 As shown, figure 1 This is the structural principle diagram of a typical rope-type telescopic arm mechanism. [0004] The lifting arm of the telescopic arm mechanism includes five sections of arms, namely the first telescopic arm 1, the second telescopic arm 2, the third telescopic arm 3, the fourth telescopic arm 4 and the fifth telescopic arm 5, wherein the first telescopic arm Arm 1 is the basic arm and does not telescope relative to the vehicle body. The other telescopic arms are nested in sequence and telescope r...

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Problems solved by technology

[0009] Second, in the above scheme, the two ends of the extension cable are respectively connected to the tails of the two telescopic arms, so the extension cable has a large span and a long length, which is easy to cause telescopic jerking of the telescopic arm, slackness of the cable and flapping of the telescopic arm cylinder, etc. problem, lower reliability; moreover, when the second extension cable 14 adopts a single wrap-around structure, the safety reliability is lower;

[0010] Third, the space in the telescopic arm is limited. In order to realize the smooth work of the first telescopic oil cylinder 6 and the second telescopic oil cylinder 7, the cavities of the first telescopic oil cylinder 6 and the second telescopic oil cylinder 7 are connected. This oil circuit connection method makes The two oil cylinders will affect each other, which reduces the work efficiency and the controllability of the telescopic boom

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