Retractable arm type crane and arm pin device thereof

Abstract

The invention discloses an arm pin device for a retractable arm type crane. The arm pin device comprises a pin shaft, wherein the pin shaft is used for detachably fixing adjacent two joint arms; the pin shaft is provided with a central hole which extends along an axial direction of the pin shaft; a first bolt penetrates through the central hole and is fixedly connected with the axial direction of the pin shaft and movably connected with the peripheral direction of the pin shaft. The arm pin device further comprises a core shaft, wherein one end of the core shaft is fixedly connected with a support of an inner joint arm; the core shaft is provided with a first inner thread matched with the first bolt; the core shaft penetrates through the first thread to be engaged with the first bolt. Therefore, the arm pin device disclosed by the invention adopts a central lifting and pressing structure which takes the core shaft as a main body; in a pressing-down process of the arm pin device, a stressing direction is arranged along the axis of the pin shaft, so that the generation of lateral force is avoided and the joint arms can be smoothly detached. The invention further discloses the retractable arm type crane comprising the arm pin device.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an arm pin device for a telescopic arm crane. The invention also relates to a telescopic boom crane comprising the above-mentioned jib pin arrangement. Background technique [0002] With the rapid development of my country's economic construction, the market demand for various construction machinery, especially cranes, is increasing. The jib is an important part of the crane. The load during hoisting is realized through the jib, and its advantages and disadvantages will greatly affect the performance of the crane. [0003] Truck cranes with a smaller tonnage generally use cylinder rope row telescopic boom devices, usually through two telescopic cylinders, pulleys and rope rows to drive the synchronous expansion and contraction of each section of the telescopic boom. However, with the gradual development of large-scale products, the large arm weight and small carrying capaci...

AI Technical Summary

Problems solved by technology

[0007] However, for cranes with a larger tonnage, the arm pin has a larger structural size. When the above-mentioned joint arm is disassembled, the arm pin needs to be pressed down on the edge of the arm pin, causing the arm pin to form a large lateral force on the arm pin seat. It may jam the arm pin, or even hinder the pressing action of the arm pin, which will affect the smooth disassembly of the joint arm

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