A retractable brush cutter

Abstract

The application relates to a retractable brush cutter, which relates to the field of agricultural and forestry machinery, including a power device, a working tube, and a cutter head. The working tube includes an inner sliding tube and an outer sleeve. There is a rotating shaft, and the rotating shaft includes a sleeve shaft and an inner shaft arranged coaxially. The power device drives the cutterhead to rotate through the rotating shaft; In the tube, the outer wall of the inner shaft in the inner sliding tube is provided with external threads, and the inner sliding tube is provided with a movable driving part, and the driving part is provided with a threaded surface facing the external thread. When the threaded surface touches the external thread, the inner shaft rotates through the external thread 1. The threaded connection of the threaded surface drives the inner shaft to move in the direction of the power device. During the rotating process of the rotating shaft of the brush cutter, the working tube can also be adjusted to shorten; by setting the external thread and the driving part, the power to drive the axial movement of the inner shaft comes from the rotational force of the inner shaft, which saves labor.

Description

technical field [0001] The present application relates to the field of agricultural and forestry machinery, in particular to a telescopic brush cutter. Background technique [0002] The brush cutter is an agricultural and forestry machine used to cut shrubs and branches, and it can also cut trunks with smaller diameters. The brush cutter generally uses a gasoline engine as a driving source, and the blade rotates to cut shrubs and branches. [0003] The Chinese utility model patent with authorized announcement number CN202476099U discloses a retractable brush cutter, including a power unit, a gearbox and a working rod. Cavity, a transmission shaft is provided in the cavity of the sleeve, a supporting structure is provided between the sleeve and the transmission shaft, and a detachable locking adjustment device is installed on the other end of the sleeve. The transmission shaft is connected by internal and external spline structure, and transmits torque. [0004] In view of...

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Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that during the use of the brush cutter, that is, when the transmission shaft is in the process of rotation, there is a pressing force between the two shafts of the transmission shaft, the friction force is relatively large, and the staff adjusts the working rod to shorten more laborious

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