Telescopic mechanism and crane

Abstract

The invention provides a telescopic mechanism and a crane. The telescopic mechanism includes: a articulated arm set, a telescopic oil cylinder, a rope assembly and a support rod; The outside is a joint arm; the telescopic oil cylinder is connected with the joint arm kit; the rope assembly is inside the joint arm kit, and is respectively connected with the joint arm kit and the telescopic oil cylinder; the telescopic oil cylinder cooperates with the rope assembly to drive the other joint arms except one joint arm Synchronous expansion and contraction; the support rod is connected to the tail of the N-1 section arm; the rope assembly includes the first pulley and the first outrigger rope; the first pulley is set at the head of the support rod; one end of the first outrigger rope is fixed to the N section The tail of the arm and the other end are fixed to the tail of a section of the arm after bypassing the first pulley; the first outrigger rope is used to drive the N-section arm and the N-1 section arm to extend out synchronously. The N-section arm and the N-1-section arm of the present invention are synchronously stretched out by the same outrigger rope, which reduces the stress on the rope assembly.

Description

technical field [0001] The invention relates to the technical field of lifting equipment, in particular to a telescopic mechanism and a crane. Background technique [0002] The boom is the core component of the truck crane and the most important load-bearing structural component for the lifting operation of the truck crane; the weight, strength, rigidity, telescopic efficiency and stable reliability of the boom will directly affect the performance of the truck crane product. Through the technical innovation of the boom, improving the lifting capacity, the lifting capacity and the telescopic efficiency of the boom is the goal that all crane manufacturers are constantly pursuing. At present, the products that account for the majority of the market share of truck cranes have the boom telescopic mechanism of the cylinder rope row type, for example, the five-section boom includes five telescopic booms, two telescopic cylinders, two retractable boom ropes and two boom ropes It ne...

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 weight is large and the cost is high; the wheels and the outrigger rope are arranged outside the arm, which is unsightly and easy to be damaged; 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 simultaneous expansion and contraction of the joint boom, and the N-section boom and the N-1 section boom are synchronously extended by the same outrigger rope, which reduces the stress of the rope assembly, the self-weight and cost of the whole set of booms

[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 And the rope assembly realizes the simultaneous expansion and contraction of the joint boom, and the N-section boom and the N-1 section boom are synchronously extended by the same outrigger rope, which reduces the force of the rope assembly, the self-weight and cost of the whole set of booms

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