Telescopic boom and engineering machinery comprising same

Abstract

The invention discloses an engineering machinery and a telescopic boom thereof. The disclosed telescopic boom comprises a boom pin and a pin stirring mechanism; a first section of boom and a second section of boom are respectively provided with an boom pin hole; the boom pin can be installed in the first section of boom in a sliding mode; the head of a driving mechanism is provided with a telescopic cylinder pin; the pin stirring mechanism is cooperated with the boom pin; the telescopic boom is also provided with a transmission mechanism; and when the cylinder pin extends out, the transmission mechanism drives the pin stirring mechanism, so that the boom pin is pulled out from the boom pin hole of the second section of boom. When the telescopic boom is used, cylinder pin inserting action and boom pin pulling action are linked, so that a boom pin pulling driving device is not needed any more, and the structure of the head of the driving mechanism is simpler. Because the boom pin pulling driving device is not needed any more, a pipeline or a line connected with the boom pin pulling driving device is not needed anymore, thereby reducing interference between the driving mechanism and the pipeline or the line.

Description

technical field [0001] The present invention relates to a locking technology of construction machinery, in particular to a telescopic arm, and to construction machinery including the telescopic arm, in particular to a crane including the telescopic arm. Background technique [0002] Currently, telescopic arms whose length can be changed according to actual needs are widely used in construction machinery such as cranes and hoists. [0003] At present, the telescopic boom usually adopts the structure of a single-cylinder multi-section boom, which includes a plurality of nested joint booms and a telescopic cylinder that drives the telescopic boom; generally speaking, the lowermost joint boom is hinged to an appropriate chassis Connected, called the base arm; other joint arms are sequentially set inside the base arm; the bottom of the telescopic cylinder is connected with the lower end of the base arm, and the head protrudes along the extension direction of the telescopic arm. ...

AI Technical Summary

Problems solved by technology

[0008] Although the existing technology can realize the control of the arm pin and the cylinder pin, because the cylinder pin telescopic and the pin mechanism are respectively driven by different driving devices, this leads to a very complicated structure of the telescopic arm, especially the head of the telescopic cylinder.

Moreover, due to the need to set up pipelines or lines connected to the corresponding drive mechanism, it is easy to interfere between the telescopic cylinder and the pipelines or lines, which affects the reliability and telescopic efficiency of the telescopic arm.

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