A personal protection chain circuit in the work area

Abstract

The invention provides a personal protection interlock circuit with sound and light alarm, and relates to a personal security circuit, which is composed of a power supply circuit, a signal input circuit, a processing circuit, an interlock control circuit and a sound and light alarm circuit, wherein the power supply circuit is composed of a power supply interface, a rectifier transformer, a rectifier integrated block, a voltage-stabilizing block and a filter capacitor; the signal input circuit is composed of an infrared emission tube, an infrared receiving tube, a signal transmission interface, an NAND gate and an isolating diode; the processing circuit is composed of a feedback resistor, an NAND gate b, an isolating resistor, and an NAND gate c; the interlock control circuit is composed of a button switch, an NAND gate c, a drive resistor, a triode a, a clamp diode, a relay and an interlock interface; and the sound and light alarm circuit is composed of a solid voice circuit, a rate resistor, a rate capacitor, a bias resistor, a triode b, a loudspeaker, and an alarm light-emitting diode. With the protection interlock circuit of the invention, when a person enters a dangerous area for work, accidental start-up of equipment can be automatically stopped, and sound and light alarm can be carried out.

Description

technical field [0001] The invention relates to electronic circuits, in particular to a personal security circuit. Background technique [0002] When people work in areas that threaten personal safety, protective measures are required. When the factors that threaten personal safety come from mechanical equipment, the common protective measures are infrared cut-off shutdown and manual power-off shutdown. Among them, infrared cut-off shutdown is the use of human body isolation Between the infrared emitting tube and the receiving tube, the receiving tube cannot receive the infrared light signal and the equipment is shut down, but when the operator leaves the line range between the infrared emitting tube and the receiving tube during work, the equipment will start unexpectedly Casualty accidents caused by people being pinched, or accidents caused by accidental start-up of equipment due to misoperation of the receiving tube due to light interference. Power outages often cause ac...

AI Technical Summary

Problems solved by technology

[0002] When people work in areas that threaten personal safety, protective measures are required. When the factors that threaten personal safety come from mechanical equipment, the common protective measures are infrared cut-off shutdown and manual power-off shutdown. Among them, infrared cut-off shutdown is the use of human body isolation Between the infrared emitting tube and the receiving tube, the receiving tube cannot receive the infrared light signal and the equipment is shut down, but when the operator leaves the line range between the infrared emitting tube and the receiving tube during work, the equipment will start unexpectedly Casualty accidents caused by people being pinched, or accidents caused by accidental start-up of equipment due to misoperation of the receiving tube due to light interference. Power outages often cause accidents due to unexpected startup of equipment

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