Pulley device of high-redundancy absolute grating ruler read head

Abstract

The invention discloses a pulley device of a high-redundancy absolute grating ruler read head. The pulley device of the high-redundancy absolute grating ruler read head comprises a pulley body, a first idler wheel, a second idler wheel, a first angular encoder, a second angular encoder, fixed idler wheels, a scanning circuit board and grating glass, wherein the radius of the first idler wheel and the radius of the second idler wheel are different, the grating glass is installed below the pulley body, the scanning circuit board is installed below the grating glass, the first idler wheel and the second idler wheel both of which the radiuses are different are respectively fixed to the lower end of the pulley body, the first angular encoder and the second angular encoder penetrate through the pulley body to be connected with the first idler wheel and the second idler wheel respectively and are used for recording the rolling angle of the first idler wheel and the second idler wheel in the measurement process, the fixed idler wheels are fixed to the side face of the pulley body, and the fixed idler wheels are tight attached to the grating glass to roll in the measurement process. The pulley device of the high-redundancy absolute grating ruler read head can improve reliability of reading, has the functions of judging the direction of movement of the grating ruler read head and calculating the displacement, and provides the standby limit function of a grating ruler.

Description

technical field [0001] The invention is a high-redundancy absolute grating ruler reading head pulley device, which belongs to the transformation technology of the high-redundancy absolute grating ruler reading head pulley device. Background technique [0002] In the modern machining industry, grating sensors are mostly used as position feedback devices. Since the grating ruler can implement full closed-loop control on the system, reduce the error caused by the thermal deformation of the ball screw and improve the machining accuracy, so the grating ruler is more and more used as the linear displacement feedback element in the current high-end CNC system [1] . Its high precision and high resolution combined with a relatively low price make it widely used not only in the field of machine tools, but also in coordinate measuring machines, robotics, every position and speed measurement, and position and motion control applications [2] . [0003] The accuracy of the grating rul...

AI Technical Summary

Problems solved by technology

[0004]The traditional grating ruler relies solely on the grating glass to read the position information, the reliability is low, especially after being polluted, the bit error rate is extremely high; the amount of information processing is large , the moving speed is slow, resulting in a decrease in processing efficiency; if the grating ruler fails, it cannot be used normally immediately; the limit function mode is single, if the limit device fails, the grating ruler is vulnerable to strong impact and scrapped

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