Automobile crane and device with multiple sections of telescopic jibs thereof

Abstract

The invention discloses a device with multiple sections of telescopic jibs, comprising a fringe connection part and a bolt connection part; the fringe connection part comprises at least two sections of telescopic jibs located in the inside and connected with a travel cable through a turning wheel; the bolt connection part comprises at least one section of telescopic jib located at the outside and connected with a cylinder pin through a jib pin and a basic jib (211); a cylinder tube (281) of a telescopic cylinder (28) is connected with the outmost section of telescopic jib of the fringe connection part. Therefore, in the extending processing of the telescopic jibs, each section of telescopic jib of the fringe connection part extends synchronously, which increases the extending speed of the device with multiple sections of telescopic jibs as well as the working efficiency; at the same time, because the fringe connection part is connected with the bolt connection part by the jib pin (262), and the axial force between the telescopic jibs is transmitted through the jib pin, the stress condition of the telescopic cylinder (28) is improved, the size is reduced properly so as to reduce the cost. The invention further discloses an automobile crane comprising the device with multiple sections of telescopic jibs.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a multi-section telescopic arm device used for a truck crane. The present invention also relates to a truck crane comprising the above-mentioned multi-section telescopic boom device. Background technique [0002] With the rapid development of my country's economic construction, the market demand for truck cranes is increasing. [0003] The telescopic boom is an important part of the truck crane. The load during hoisting is realized by the telescopic boom, and its advantages and disadvantages will greatly affect the performance of the truck crane. [0004] 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...

AI Technical Summary

Problems solved by technology

However, since each section of the telescopic arm in this device is extended and retracted section by section, and the extension and retraction of each section of the arm requires the insertion and extraction of cylinders and arm pins, the expansion and contraction speed is relatively slow, thus Affect the working efficiency of the crane

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