Extension tube linkage device

Abstract

The invention discloses an extension tube linkage device and belongs to electric extension tubes. The extension tube linkage device solves the problem that transmission stability, structural reliability and axial load-bearing capacity are poor in the prior art. According to the technical scheme, the extension tube linkage device mainly comprises a first linkage assembly and a second linkage assembly, wherein the first linkage assembly comprises a first screw and a first nut meshed with the first screw; the front end of the first screw is connected with a drive device; the first nut is fixedly connected with a middle tube; the drive device drives the first screw to rotate relative to the first nut, so that an outer tube axially moves relative to the middle tube; the second linkage assembly comprises a second screw and a second nut meshed with the second screw; the second screw and the first screw rotate synchronously; the second screw is axially positioned relative to the middle tube; the second nut is fixedly connected with an inner tube; the second screw rotates relative to the second nut along with the first screw, so that the middle tube axially moves relative to the inner tube. The extension tube linkage device is mainly used for extension tubes which are borne in the axial direction and stretch out and draw back electrically.

Description

technical field [0001] The invention relates to a telescopic tube, in particular to a telescopic tube linkage device. Background technique [0002] The general electric telescopic tube or telescopic rod structure, taking the three-section tube body as an example, the rear end of the inner tube is inserted into the middle tube, the rear end of the middle tube is inserted into the outer tube, and then the motor set in the outer tube drives the screw to rotate, and the screw is equipped 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 telescopic tube is extended, the inner tube moves first, After the relative middle tube stretches out to a certain size, it will drive the middle tube to continue to expand and contract. When the mi...

AI Technical Summary

Problems solved by technology

It can be seen that whether it is elongated or shortened, the telescopic tube of this structure is that the inner tube moves in place 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 structural reliability are not very good, and the axial load-bearing capacity is poor

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