What are the applications of photoelectric sensors in automatic production lines for light industry?

The photoelectric sensor uses a photoelectric element as the detection element to first transform the measured change into a change in signal, and then further converts the optical signal into an electrical signal with the help of the photoelectric element. Photoelectric sensors generally consist of 3 parts: light source, optical path and photoelectric element. Photoelectric detection method has the advantages of high accuracy, fast response, non-contact, and more parameters can be measured, the structure of the sensor is simple, flexible and diverse forms, small size. In recent years, with the development of photoelectric technology, photoelectric sensor has become a series of products, its variety and production is increasing, users can choose a variety of specifications according to the needs of the product, in a variety of light industrial automatic machine to obtain a wide range of applications.

1. Optical strip runout detector
Strip runout detector is used to detect the size and direction of strip material deviating from the correct position in processing, so as to provide a correction signal for the correction control circuit, mainly used in the production process of printing and dyeing, paper feeding, film and magnetic tape.


2. Package filling height detection

The finished products packaged by volumetric method, in addition to a certain error range requirements for weight, generally also have certain requirements for the filling height to ensure the quality of the appearance of goods, does not meet the filling height of the finished product will not be allowed to leave the factory. Shown is the principle of controlling the filling height with the help of photoelectric detection technology. When the filling height h deviation is too large, the photoelectric connector has no electrical signal, that is, the actuator will push out the packaging items for processing.


3. photoelectric color quality detection

Photoelectric color quality detection principle. If the packaging items specified base color is white, due to poor quality, some appear yellowing, before the product packaging by photoelectric detection of color quality, items yellowing, there is a comparative voltage difference output, turn on the solenoid valve, by the compressed air will be yellowing items blow out.


4. color plastic packaging bag making plastic film position control

The rolled plastic film printed with trademarks and text, and positioning color mark. Packaging requires accurate positioning of the trademark and text, and shall not cut the pattern in the middle. The position of the trademark on the film is detected by the photoelectric system and amplified to control the electromagnetic clutch. When the color mark on the film (a small area that does not transmit light, usually black) does not reach the position of the positioning color mark, the photoelectric system can make the electromagnetic clutch have electricity and absorb because the light from the light thrower can pass through the film, and the film can continue to move. After this signal is converted and amplified by photoelectricity, the electromagnetic clutch is disconnected, and the film stops at the position precisely, and then continues to move after it is cut off.


In addition, the presence or absence and width of the fabric can be detected by using the reflective photoelectric sensor. The sagging of the fabric is detected by using the masking photoelectric sensor, and the result can be used to adjust the tension of the fabric in the transmission. Using the reflective photoelectric sensor installed on the frame, the empty box of missed products can be found and the empty box can be pushed out by using the oil cylinder.