Electromagnetic force balance-based high-life variable-pitch screw mechanism

Abstract

A high-life variable-pitch screw mechanism based on an electromagnetic force balance includes a lead screw, a nut, a pin roller, and an electromagnet, a variable-pitch helical groove is arranged in the outer wall of a body of the lead screw, the two ends of the lead screw are respectively secured to a base of a load-bearing drive mechanism of a subway door, the nut sleeves the lead screw to form ascrew pair, the pin roller and the electromagnet are both disposed within the nut, the pin roller includes a roller and a pin, the roller is rotatably connected to one end of the pin, the other end of the pin is fixedly connected with the annular inner wall of the nut, the electromagnet includes concentrically disposed first and second electromagnetic rings, the second electromagnetic ring sleeves the pin, the second electromagnetic ring is in transitional engagement with the pin, the first electromagnetic ring sleeves the second electromagnetic ring, the nut is fixedly connected with the subway door via the screw pair. The present invention takes advantage of the electromagnetic forces generated by the electromagnet to balance the force of the rollers against the helical groove and the force of the pin by the nut, such that the operation of the entire variable-pitch screw mechanism is balanced, and the service life is improved.

Description

technical field [0001] The invention belongs to the technical field of transmission devices, and in particular relates to a high-life variable-lead screw mechanism based on electromagnetic force balance. Background technique [0002] Zhang Bentao, in the article "Design of variable lead screw pair for subway doors and research on related technologies", proposed to use variable lead screw pair instead of traditional constant lead screw as the transmission system of subway doors, so as to realize the variable speed of subway doors Movement, and the lead of the screw rod is zero at the closed position of the subway door, which can realize the mechanical self-locking of the subway door, no need to design an additional locking device, simplifies the structure of the subway door system, reduces the production cost of the subway door and The operation reliability of the subway door is improved. However, this solution also has shortcomings. The rollers in the designed helical pair ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-life variable lead screw mechanism based on electromagnetic force balance, to solve the problem that during the internal rolling process of the roller in the spiral groove, the force on the roller by the spiral groove is greater than the force on the pin shaft by the nut. Causes the unbalanced force on the pin roller, the structure of the pin roller is easily damaged, and affects the operating life of the entire helical pair structure

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