In modern factories, people and machines work together on some potentially dangerous mechanical equipment, such as stamping machinery, shearing equipment, metal cutting equipment, automated assembly lines, automated welding lines, mechanical transmission and handling equipment, hazardous areas (toxic, High pressure, high temperature, etc.), it is easy to cause personal injury to operators.
The light curtain sensor is also a photoelectric safety protection device (also known as laser curtain sensor, infrared light curtain, infrared safety protection device, etc.), which uses the photoelectric principle to effectively protect the safety of operators.
Working principle of safety light curtain
One side of the light curtain is equipped with multiple infrared emitting tubes at equal intervals, and the other side has the same number of infrared receiving tubes in the same arrangement. Each infrared emitting tube corresponds to a corresponding infrared receiving tube, and they are installed on the same straight line. . When there is no obstacle between the infrared emitting tube and the infrared receiving tube on the same straight line, the modulation signal (light signal) sent by the infrared emitting tube can reach the infrared receiving tube smoothly. After the infrared receiving tube receives the modulation signal, the corresponding internal circuit outputs low level, and in the case of obstacles, the modulation signal (light signal) sent by the infrared transmitting tube cannot reach the infrared receiving tube smoothly. At this time, the infrared receiving tube The tube cannot receive the modulation signal, and the corresponding internal circuit output is high. When there is no object in the light curtain, the modulation signal (light signal) from all the infrared emitting tubes can reach the corresponding infrared receiving tube on the other side smoothly, so that all the internal circuits output low level. In this way, the presence or absence of an object can be detected by analyzing the state of the internal circuit.
