Precise rotary table bearing with time grating detection and control

Abstract

The invention discloses a precise rotary table bearing with time grating detection and control, which comprises a precise rotary table. The precise rotary table consists of a second moving coil (1), a static coil (3), a first moving coil (4), a first group of cylindrical rollers (5), a second groups of cylindrical rollers (6) and a third groups of cylindrical rollers (8), wherein the second moving coil is installed on the upper end surface of the first moving coil, the static coil is installed among the lower end surface of the second moving coil, the thrust rolling track surface of the first moving coil and the external diameter rolling track of the first coil, the first groups of cylindrical rollers are installed between the lower end surface of the static coil and the thrust rolling track surface of the first moving coil, the second groups of cylindrical rollers are installed between the external diameter rolling track of the first coil and an inner diameter of the static coil, the third groups of cylindrical rollers are installed between the upper end surface of the static coil and the lower end surface of the second moving coil, and division teeth are arranged on the external circle of the second moving coil. The upper end surface of the static coil is provided with a time grating sensor (2) which transmits detected clock pulse signals to a microprocessor, so that high-precision detection, control and positioning for the precise rotary table are achieved through a control system, and rotating angles or moving radians of the precise rotary table can be detected and controlled in time.

Description

technical field [0001] The invention belongs to the technical field of precision turntables, and mainly relates to a precision turntable bearing with a time grid measurement and control device. technical background [0002] Precision rotary table bearings are mainly used in equipment that requires high rotational accuracy, large axial and radial loads, and tilting moments, such as CNC machining center rotary tables, radar rotary tables, medical rotary tables, precision machine tools, etc. The supporting part of the precision turntable bearing is affected by factors such as fatigue and wear during the transmission process, and its rotation accuracy will gradually decrease, resulting in a gradual increase in operating errors. At present, the measures taken to solve such problems are: to determine the angle or arc of rotation of the precision turntable by setting the measurement system. However, because the existing measurement systems use magnetic grids, steel grids, gratings...

AI Technical Summary

Problems solved by technology

However, because the existing measurement systems use magnetic grids, steel grids, gratings, etc., and this type of measurement system has high requirements for the environment, the highest accuracy of the measurement system can only reach ±3 arc seconds, which cannot meet the actual high-precision needs

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