Multichannel infrared photoelectric safety detection method and its equipment

Abstract

Several infrared photoelectric transmitters and several infrared photoelectric receivers are one-to-one correspondently formed into mulltiple detection optical pathes, according to the light blocking condition of every optical path the safety detection can be implemented. Said invention is characterized by that all the optical pathes are alternatively worked in synchronous time-sharing scanning mode, in every slot only one optical path is used for transmitting and receiving infrared light synchronously, so that it has no need of detecting every transmitting and receiving branch state, all the optical pathes are not interfered mutually, and the high-density optical path network can be arranged, and the optical path has no need of regulation and correction.

Description

Technical field: [0001] The invention relates to a multi-channel infrared photoelectric safety detection method and device. Background technique: [0002] In paper cutters and punch machines, in order to protect the operator, it is often necessary to install a photoelectric detection device. Likewise, such devices may be required in other "restricted access" applications. The principle of the traditional photoelectric safety detection circuit is: each transmitting and receiving branch is relatively independent, and it is necessary to judge the state of each transmitting and receiving branch at the same time to determine whether the circuit is reversed, which makes the circuit structure complex, and multiple infrared lights work at the same time , mutual interference and easy to be affected by external factors, resulting in low reliability and difficulty in optical path calibration. The distance between each group of branches cannot be too close, which seriously limits the o...

AI Technical Summary

Problems solved by technology

The principle of the traditional photoelectric safety detection circuit is: each transmitting and receiving branch is relatively independent, and it is necessary to judge the state of each transmitting and receiving branch at the same time to determine whether the circuit is reversed, which makes the circuit structure complex, and multiple infrared lights work at the same time , mutual interference and easy to be affected by external factors, resulting in low reliability and difficulty in optical path calibration. The distance between each group of branches cannot be too close, which seriously limits the occasions where the distance between adjacent optical paths is within tens of millimeters. use of

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