Electric telescopic tube

Abstract

The invention discloses an electric telescopic tube and belongs to the field of motors. By adoption of the electric telescopic tube, the problem that in the prior art, the axial bearing capacity is poor is solved. According to the technical scheme, the electric telescopic tube mainly comprises an inner tube body, an intermediate tube body and an outer tube body. The front end of the inner tube body is inserted into the intermediate tube body; the front end of the intermediate tube body is inserted into the outer tube body; a drive device is arranged at the front end of the outer tube body; a first linkage assembly is arranged in the intermediate tube body and comprises a first screw and a first nut engaged with the first screw; the front end of the first screw is connected with the drive device, and the first nut is fixedly connected with the intermediate tube body; a second linkage assembly is arranged in the inner tube body and comprises a second screw and a second nut engaged with the second screw; and the second screw synchronously rotates with the first screw, the second screw is axially positioned relative to the intermediate tube body, and the second nut is fixedly connected with the inner tube body. The electric telescopic tube is mainly used for axial reciprocating driving, in particular for lifting mechanisms.

Description

Technical field [0001] The invention relates to an electric telescopic tube, in particular to a three-section electric telescopic tube with an inner tube, a middle tube and an outer tube. Background technique [0002] A general electric telescopic tube or telescopic rod structure with a three-section tube body, the rear end of the inner tube is inserted into the middle tube, and the rear end of the middle tube is inserted into the outer tube, and then the drive motor set in the outer tube drives the screw to rotate, and the screw is provided with a nut. The nut is fixedly connected to the inner tube, and the inner tube cannot rotate relative to the middle tube. Therefore, the nut cannot follow the rotation of the screw and moves along the axial direction of the screw, thereby driving the inner tube to expand and contract. For example, when the electric telescopic tube is extended, the inner tube moves first. When the relative middle tube is extended to a certain size, it will dri...

AI Technical Summary

Problems solved by technology

It can be seen that whether it is elongated or shortened, the electric telescopic tube with this structure only moves the inner tube first before the middle tube starts to move. Once the nut and the screw are loosened, the inner tube and the middle tube will loosen together, so in the transmission The stability and reliability of the structure are not very good, and the axial load-bearing capacity is poor

Images