Truck crane and multisection synchronous telescopic boom device thereof

Abstract

The invention discloses a multisection synchronous telescopic boom device which is characterized in that a cylinder lever and a cylinder barrel of a telescopic oil cylinder are respectively installed between any two adjacent telescopic booms out of a basic boom and a tail telescopic boom; any one telescopic boom out of the basic boom and the tail telescopic boom is fixedly connected with an extension boom runner and a retraction boom runner; an extension boom guy cable rounds the extension boom runner and both ends thereof are respectively and fixedly connected with an upper boom and a lower boom of the telescopic boom on which the extension boom runner is positioned; a retraction boom guy cable rounds the retraction boom runner and both ends thereof are respectively and fixedly connected with an upper boom and a lower boom of the telescopic boom on which the retraction boom runner is positioned; synchronous extension and retraction of the multisection synchronous telescopic boom device of the engineering crane can be realized only by using one telescopic oil cylinder, thus effectively reducing weight of the boom and further improving the stability of the crane during lifting. The invention also discloses a truck crane comprising the multisection synchronous telescopic boom device.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a multi-section synchronous telescopic arm device for a truck crane. The present invention also relates to a truck crane comprising the above-mentioned multi-section synchronous 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 is carried by the telescopic boom when hoisting, and its advantages and disadvantages will greatly affect the performance of the truck crane. [0004] Please refer to figure 1 , figure 1 It is a structural schematic diagram of a typical five-section synchronous telescopic boom device for a truck crane in the prior art. [0005] The five-section synchronous telescopic arm includes a basic arm 121 and a second section arm 122, a third section arm 123, a f...

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