Dynamic self-check method of safety light curtain

Abstract

The invention discloses a dynamic self-check method of a safety light curtain. The method comprises a photoelectric protection sensor circuit composed of a luminous array, a luminous scanning circuit, a light receiving array, a light receiving scanning array, a light curtain scanning logic circuit, a signal amplifying processing circuit, a light curtain output control circuit and a dynamic self-check processing circuit, wherein the dynamic self-check processing circuit is connected with an output end of the signal amplifying processing circuit and connected into the light curtain output control circuit; in the response time of photoelectric protection, a non-luminous scanning self-check frame and a non-receiving scanning self-check frame are inserted into a normal photoelectric scanning frame array; and when the dynamic self-check processing circuit analyzes and processes the light receiving output signal between the two self-check frames, the aim of detecting the status of the whole scanning circuit is achieved. Through the invention, various faults covering all luminous and light receiving circuits can be diagnosed by adding a few circuits and control logics; the anti-jamming capability is strong; and the structure is simple and reliable and can be realized by a general logic device, being favorable for realizing domestic production of 4-level safety photoelectric protectors or safety light curtains so as to break foreign monopoly.

Description

technical field [0001] The invention relates to a dynamic self-inspection method for a safety light curtain, which is a self-inspection method for checking the working state of a scanning circuit in a four-level safety photoelectric protection sensor for personal safety. Background technique [0002] As my country becomes the world's processing and manufacturing center and the country pays more and more attention to safety production, the safety requirements for preventing major accidents are getting higher and higher. The safety standard for forging mechanical photoelectric protectors (or safety light curtains) has also been raised to the highest international standard IEC61496 (level 4). At present, only a few international giants such as Honeywell of the United States, SICK of Germany, and Omron of Japan have obtained IEC61496 (level 4) certification for light curtains. With this certification, they monopolize the high-end market. The key technology is the photoelectric p...

AI Technical Summary

Problems solved by technology

However, the above self-test circuits also have insurmountable shortcomings: the detection method is passive, cannot identify the correct signal of the optical path, and has poor anti-interference ability; each self-test circuit is independent of each other and cannot guarantee the integrity of the whole; and with the increase of the optical path , self-test signal transmission and reliability are more difficult to guarantee

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