Electric telescopic pipe

Abstract

The invention discloses an electric telescopic pipe, and belongs to the field of motors. The problem that in the prior art, the axial bearing capacity is poor is solved. According to the technical scheme for solving the problem, an inner pipe, a middle pipe and an outer pipe are mainly included. The front end of the inner pipe is inserted in the middle pipe. The front end of the middle pipe is inserted in the outer pipe. A drive device is arranged at the front end of the outer pipe. A first linkage assembly is arranged in the middle pipe and comprises a first screw and a first nut which are engaged with each other. The front end of the first screw is connected with the drive device. The first nut and the middle pipe are fixedly connected. A second linkage assembly is arranged in the inner pipe and comprises a second screw and a second nut which are engaged with each other. The second screw and the first screw synchronously rotate, the second screw is axially positioned relative to the middle pipe, and the second nut and the inner pipe are fixedly connected. The electric telescopic pipe is mainly used for axial reciprocating drive and is particularly used for a lifting mechanism.

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] Generally, there is an electric telescopic tube or telescopic rod structure with three tube bodies. 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. Then, the driving motor installed in the outer tube drives the screw to rotate. 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, so the nut cannot follow the rotation of the screw, but 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 stretches out to a certain size, it wi...

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

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