A high-precision digital circular indexing sensor, system and detection method

Abstract

The invention discloses a high-precision digital circular indexing sensor and a circular indexing detection method thereof. The current indexing discs are divided into two types: mechanical and grating encoding discs. The mechanical type has low precision, and the grating encoding disc can only perform indexing measurement and display when rotating, and cannot realize circular indexing and positioning of workpieces online. The invention includes a grating circular indexing sensor, a driving motor, a data processing system and a data display system. The grating circular indexing measurement is through the relative movement between the dynamic and static grating sheets and the main rotating grating sheet to form two pairs of dynamic and static grating pairs. The grating has only one grating line, and generates two dynamic and static pulse sequences through photoelectric conversion. When performing circular indexing measurement, the sensor inputs mechanical circular indexing information, and the two pulse sequences generate a phase difference to form a phase difference (circular index output) square wave pulse. And circular periodic square wave pulse, and through "AND" and counting with high-frequency pulse sequence to realize the measurement of mechanical circular division.

Description

technical field [0001] The invention belongs to the technical field of mechanical circular indexing measurement, and in particular relates to a high-precision digital circular indexing sensor, a system and a detection method. Background technique [0002] Indexing is a method of dividing the circumference of a circular workpiece into several equal parts. In the machinery industry, indexing is realized by indexing plates. The accuracy of indexing plates is the basis for the machining accuracy of circular parts. At present, the main There are two kinds of mechanical type and grating coding type. The mechanical circular indexing plate can be divided into three types: direct indexing, simple indexing, and differential indexing. The mechanical indexing plate is a traditional indexing device that is driven by a worm gear. The structure is complex and the transmission The indexing achieved by the chain has a large cumulative error and is usually less accurate. The grating-coded i...

AI Technical Summary

Problems solved by technology

The mechanical circular indexing plate can be divided into three types: direct indexing, simple indexing, and differential indexing. The mechanical indexing plate is a traditional indexing device that is driven by a worm gear. The structure is complex and the transmission The indexing implemented by the chain has a large cumulative error and is usually less accurate

The grating-coded indexing disc is the most commonly used circular indexing instrument at present. It is a relatively mature indexing instrument. It can generally achieve classification and the highest precision can reach the second level. However, due to the use of the grating measurement principle, it also has some difficulties. Defects

First of all, the circular grating used as a measurement standard must be precisely machined and installed, which will inevitably lead to high manufacturing costs; and due to the limitation of the precision of the manufacturing machine, it is becoming more and more difficult to improve the processing accuracy of the circular grating

Secondly, the geometric quantity conversion principle of the grating is to represent the position by the light intensity signal, and to represent the displacement by counting the number of pulses generated by the light intensity change. This light intensity change must be generated by mechanical operation, and mechanical vibration and electric field noise will interfere with the electric pulse. generation and counting, resulting in a decrease in measurement accuracy; moreover, the generation and counting of pulse counting can only be performed when the circular grating rotates, and the measurement result is only the cumulative amount of pulses generated by the grating when it rotates, which is the amount of measurement beyond the point , rather than the absolute deviation relative to the fixed zero position. Moreover, in practical applications, in order to obtain the absolute deviation, other additional operations and processing are often required, which also brings errors and inconvenience to the measurement.

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