A magnetic levitation ball screw pair

Abstract

The disclosure relates to a magnetic levitation ball screw pair. The inner wall of the screw hole in the working nut and the pre-tightening nut has a sensor group composed of a plurality of displacement sensors. The displacement sensor can measure the inner wall of the screw hole and the outer wall of the screw along the diameter direction of the screw hole. The gap value of the sensor group includes four displacement sensors uniformly distributed along the circumferential direction of the screw hole. Every two displacement sensors are used in pairs and are symmetrical about the central axis of the screw hole. The projections of multiple sensor groups along the screw axis direction coincide; An adapted excitation coil is installed at each displacement sensor. The excitation coil can attract the lead screw along the measuring direction of the adapted displacement sensor. The magnetic force of the excitation coil attracting the lead screw can be adjusted to change the gap value, thereby realizing the connection between the lead screw and the work. The axes of the nut and the pre-tightening nut are coincident.

Description

technical field [0001] The present disclosure belongs to the technical field of ball screws, and in particular relates to a magnetic suspension ball screw pair. Background technique [0002] The statements herein merely provide background related to the present disclosure and do not necessarily constitute prior art. [0003] As the equipment manufacturing industry expands to high-end, precision and other extreme manufacturing directions, high-end equipment urgently needs the supply of high-reliability core transmission components. Since the ball screw pair is an efficient and energy-saving transmission and positioning element, the ball screw pair is more and more widely used in numerical control equipment, but its contact wear can easily lead to the decrease of precision and the degradation of preload. [0004] The inventor learned that, in the conventional ball screw pair, the load is mainly transmitted by the balls between the screw raceway and the nut raceway, and the pr...

AI Technical Summary

Problems solved by technology

With the long-term operation of the ball screw pair, the raceway or the balls will be worn, and the amount of wear is difficult to quantify. Without adjustment or manual fuzzy adjustment, the pretightening force is unreasonable, which affects the bearing performance of the ball screw pair, and then affects the heavy-duty CNC equipment. Precision

[0005] At the same time, the axes of the working nut, the pre-tightening nut and the lead screw may not coincide during installation, which may easily lead to positioning errors

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