Grating line displacement transducer

Abstract

The invention relates to a grating line displacement transducer, which belongs to the technical field of photoelectric measurement and aims at improving the measurement precision of the existing grating line displacement transducer. The grating line displacement transducer comprises a carriage body, a pressure spring, a pulley, a hemisphere-head small shaft, a carriage, a pin shaft, five rolling bearings, a main grating and a big-head screw, wherein the carriage body and one end of the pressure spring are fixed to form a whole by the big-head screw, and the other end of the pressure spring is pressed in an arc groove of the pulley; the pulley is fixed on the carriage by the pin shaft; the hemisphere-head small shaft is arranged at the right lower end of the carriage body, and the hemisphere-head part of the hemisphere-head small shaft is in close contact with the carriage; and the five rolling bearings are arranged on the carriage, and the rolling surfaces of the rolling bearings are in close contact with the main grating. According to the grating line displacement transducer, the measurement precision of a grating bar is greatly improved; meanwhile, the cost increase is small, and the grating line displacement transducer has wide application space in the technical field of the photoelectric measurement.

Description

technical field [0001] The invention relates to a grating line displacement sensor and belongs to the technical field of photoelectric measurement. Background technique [0002] In the structure of the closed grating line displacement sensor, five rolling bearings are used to limit the degree of freedom of the indicating grating carriage so that it can only move along the required measurement direction, and a spring is used to exert pressure on the indicating grating carriage , so that the five bearings are in reliable contact with the guide rail surface on the main grating to ensure the normal transmission of its photoelectric signal, and at the same time, this spring plays the role of pulling the carriage. This form is simple in structure, but it will bring considerable measurement errors, which is very unfavorable to ensure the measurement accuracy of the grating ruler. [0003] Such as figure 1 As shown: a traction spring 10 is installed on the carriage body 1, and the...

AI Technical Summary

Problems solved by technology

At this time, the transmission route of the measuring point of the sensor is C→B→A, and BC is perpendicular to the moving direction under normal circumstances; but when the main grating 8 is curved, such as figure 2 As shown, at this time, BC is not perpendicular to the moving direction, and forms a small angle β with the vertical direction, which brings measurement error δ=tgβ*BC=β*BC, when BC=5mm, β=10′, δ= 0.015mm

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