Telescopic mechanism and crane

Abstract

The present invention provides a telescopic mechanism and a crane. The telescopic mechanism includes: a joint arm set, a telescopic oil cylinder, a rope assembly and a support rod; the joint arm set includes N joint arms set sequentially from outside to inside, and N is greater than Equal to 3, the outermost part is a joint arm; the telescopic oil cylinder is connected with the joint arm set; the rope assembly is inside the joint arm set and is respectively connected with the joint arm set and the telescopic oil cylinder; The telescopic oil cylinder cooperates with the rope assembly to drive the other joints except one joint to expand and contract synchronously; the support rod is connected to the tail of the N-1 joint. A telescoping mechanism and a crane provided by the present invention realize the simultaneous expansion and contraction of joint arms through a telescopic oil cylinder and six boom ropes and retractable boom ropes, which reduce the stress on the boom ropes and retractable boom ropes. The self weight and cost of the arm.

Description

technical field [0001] The invention relates to the technical field of hoisting equipment, in particular to a telescopic mechanism and a crane. Background technique [0002] The jib is the core component of the truck crane and the most important load-bearing structural part for the hoisting operation of the truck crane; the weight, strength, stiffness, expansion and contraction efficiency, and stability and reliability of the jib will directly affect the performance of the truck crane product. Through the technological innovation of the boom, improving the lifting capacity, high lifting capacity and telescopic efficiency of the boom is the goal that various crane manufacturers are constantly pursuing. At present, the telescopic mechanism of the boom of the products that account for the majority of the truck crane market adopts the oil cylinder rope arrangement, for example, the five-section boom includes five telescopic booms, two telescopic cylinders, two retractable boom r...

AI Technical Summary

Problems solved by technology

[0003] The present invention proposes a telescoping mechanism to solve the problems in the prior art that two oil cylinders are needed inside the arm, the self-weight is large and the cost is high; The force of the fourth rope is twice that of the fifth rope, and the force of the third rope is twice that of the fourth rope. The lifting capacity is greatly affected. It is not suitable for defects such as truck crane products. Through a telescopic oil cylinder and The rope assembly realizes the simultaneous expansion and contraction of the joint boom, which reduces the force of the rope assembly, the self-weight and cost of the whole set of boom

[0004] The present invention also proposes a crane to solve the problems in the prior art that two oil cylinders are needed inside the arm, the weight is large and the cost is high; The force of the fourth rope is twice that of the fifth rope, and the force of the third rope is twice that of the fourth rope. The lifting capacity is greatly affected. It is not suitable for defects such as truck crane products. Through a telescopic oil cylinder and The rope assembly realizes the simultaneous expansion and contraction of the joint boom, which reduces the force of the rope assembly, the self-weight and cost of the whole set of boom

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