The pull-up switch is a new generation photoelectric switch device made by using integrated circuit skills and SMT appearance equipment technology, which has intelligent functions such as time delay, broadening, external synchronization, mutual interference resistance, high reliability, stable operation area and self diagnosis. This novel photoelectric switch is an automatic photoelectric detection system type electronic switch with pulse modulation. The cold light sources used include infrared light, red light, green light and blue light, which can be operated quickly without touch and damage



Conditions and actions of various solid, liquid, transparent body, blackbody, soft body, smoke and other substances. The touch travel switch driving the waterproof and explosion-proof switch has the disadvantages of low response speed, poor accuracy, simple touch detection, damage to the detected object and short service life, while the transistor proximity switch has a short action interval and cannot directly detect non-metallic data. However, the new photoelectric switch overcomes the above shortcomings, and has the advantages of small volume, multiple functions, long service life, high precision, fast response, long detection interval and strong resistance to optical, electrical and magnetic disturbances.



At present, this new type of pull-out switch has been used in many fields, such as crop level detection, liquid level control, product counting, width discrimination, speed detection, fixed length shearing, hole identification, signal delay, automatic door sensing, color code detection, punch and shears, and safety protection. In addition, using the concealment of infrared ray, it can also be used in banks, warehouses, stores, offices and other places where it is necessary to guard against theft. The step-down maintenance method can be selected when maintaining the switching power supply. The method is to connect the power plug of the display to a communication voltage regulator, then adjust the output voltage of the voltage regulator to about 100V, then power on for maintenance, and increase the power supply voltage step by step for maintenance. Fault Example 1: it burns out when starting up, and the output voltage is zero. This situation is usually caused by the breakdown of the switch tube and the short circuit of the emitter and collector. At this time, the switch tube can be removed first, and the resistance of the emitter and collector to the ground can be measured. If it is zero or very small, it can be replaced. However, the machine can only be started after the components are checked for problems. Fault Example 2: grating appears "S-shaped distortion. For this problem, check the filter circuit and voltage stabilizing circuit. Generally, there is a diode open circuit, which changes from full wave rectification to half wave rectification. This may also be the problem caused by the reduction of the filter capacitor capacity. Example 3: the 220V rectifier filter circuit has a short circuit problem, and the power on is stable. First check whether the rectifier diode has a short circuit and whether the filter capacitor has serious leakage. You can also unplug the degaussing Coil plug, check whether the degaussing thermistor has short-circuit fault, and replace it if any. Fault Example 4: there is no grating or display when starting up, and the power indicator is not on, but it is not burned properly. At this time, check whether the communication mutual inductance transformer is open circuit, whether the current limiting resistance of the rectifier circuit is open circuit (burnt out) or whether the rectifier diode is open circuit. Fault Example 5: no grating, no display, and abnormal sound announced in the machine. If the "squeak" sound is declared, it indicates that the vibration frequency is low, and the components related to vibration shall be checked. If the "click" sound is declared, it indicates that the power over-current protection, and the over-current protection circuit shall be checked. According to the structure classification, the pull-out switch can be divided into three types: amplifier separation type, amplifier built-in type and power supply built-in type.



1. the amplifier separation type is to separate the amplifier from the sensor, and select the special integrated circuit and hybrid equipment process, because the sensor has the characteristics of ultra small and multi varieties, and the amplifier has many functions. Therefore, the terminal block connection method is selected for this type, which can be used for both AC and DC power supplies. It has the function of on and off delay, and can set the on and audio-visual switch. It can control six output conditions, and has two output methods: contact and level.






2. the built-in type of the amplifier is to integrate the amplifier and the sensor, select the special integrated circuit and external equipment technology, and use the DC power supply for operation. Its response speed (0.1M and 1m) can detect narrow and high-speed moving objects. Changing the polarity of the power supply can switch on and off, and can set the indicator light of self diagnosis stable operation area. Both voltage and current output methods can avoid mutual interference, which is very convenient in the system equipment.




3. the built-in type of power supply is the integration of amplifier, sensor and power supply equipment, which is made by using special integrated circuit and external equipment technology. The communication power supply is generally used, which is suitable for replacing the touch travel switch at the production site, and can be directly used for strong current control circuit. It can also set the indicator light of self diagnosis stable operation area by itself. The output is equipped with SSR solid state relay or normally open and normally closed contacts of relay, which can avoid mutual interference and close the equipment in the system.

4. operating principle of pull-out switch small audio analog switch the modulation pulse generated by the vibration circuit passes through the reflection circuit, and then the light pulse is radiated by the luminous tube GL. When the measured object enters the action scale of the light receiver, the reflected light pulse enters the photosensitive triode Du and demodulates the light pulse into an electric pulse signal in the receiving circuit, which is amplified by the amplifier and synchronously gated and shaped, then the disturbance is eliminated by digital integration or RC integration, and finally the driver is triggered to output the photoelectric switch control signal by time delay (or no time delay). Photoelectric switches generally have outstanding return difference characteristics, so even if the tested object shakes in a small scale, it will not affect the output status of the driver, and then it can be kept in a stable operation area. Together, the self diagnosis system can also show the light receiving condition and stable operation area, so as to supervise the operation of photoelectric switch at any time.