Grating scale reading head, grating scale joint and grating scale displacement sensor

Abstract

The embodiment of the invention discloses a grating scale reading head, a grating scale joint and a grating scale displacement sensor. The grating scale reading head comprises a microprocessor, and afirst reading sensor and a second reading sensor which are connected with the microprocessor and arranged in the movement direction of a grading scale. The microprocessor is configured to determine that the displacement value of a current grating scale needs gap compensation according to the movement displacement values read by the first reading sensor and the second reading sensor, the actual movement displacement value of the grating scale is calculated according to the movement displacement values read by the first reading sensor and the second reading sensor and the movement direction of the grating scale, and the grating scale reading head is applied to a grating scale displacement sensor by employing a plurality of scale gratings spliced to a grating scale main body and allowing thelength values of the gaps at the connections of the scale gratings being twice larger than the distances of the grating grooves so as to improve the displacement measurement of the grating scale displacement sensor and facilitate achievement of increasing of the measurement range of the grating scale displacement sensor through increasing of the scale grating length.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of position measurement, in particular to a grating ruler reading head, a grating ruler connector and a grating ruler displacement sensor. Background technique [0002] With the rapid development of optical technology, optical measurement technology has also been developed accordingly. Grating ruler displacement sensor, referred to as grating ruler, is widely used in the measurement of mechanical angular displacement or linear displacement of closed-loop servo system of CNC machine tools. [0003] The grating scale displacement sensor is a precision measurement feedback device that works on the principle of grating optics, including a scale grating and a grating reading head. Usually, the scale grating is fixed on the moving parts of the machine tool, the grating reading head is installed on the fixed parts of the machine tool, and the indicating grating is installed on the grating r...

AI Technical Summary

Problems solved by technology

When multiple scale gratings are spliced ​​into a long scale, adjacent scale gratings cannot be seamlessly connected, and related technologies ignore the length information at the gaps of adjacent scale gratings when measuring mobile displacement values, resulting in large errors in measured displacement values , it is difficult to meet the high precision requirements of displacement measurement

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