Dqv Photoelectric Safety Protection Device

★ Perfect self-check function: When the safety screen protector fails, ensure that the wrong signal is not sent to the controlled electrical appliances.

★ Strong anti-interference ability: The system has good anti-interference ability to electromagnetic signal, stroboscopic light, welding arc and surrounding light source;

★ Easy installation and debugging, simple wiring, beautiful appearance;

★ Surface mounting technology is adopted, which has superior seismic performance.

★ Comply with the International Electrotechnical Society lEC61496-1/2 standard,TUV CE certification.

★ The corresponding time is short (<10ms), and the safety and reliability performance is high.

★ The dimension design is 35mm*51mm. The safety sensor can be connected to the cable (M12) through the air socket.

★ All electronic components adopt world-renowned brand accessories.

★ The light curtain is pulsed, This light curtain must be used simultaneouslv with the controller. After the controller, the reaction speed is faster. The dual relay output is safer.

The safety light shield primarily comprises of two components, specifically the emitter and the sensor. The sender emits infrared beams, which are captured by the sensor to create a light screen. Upon an object's entry into the light screen, the sensor reacts promptly via the internal control system, directing the machinery (such as a press) to halt or activate an alarm to safeguard the operator, ensuring safety and maintaining normal equipment operation.

On one side of the light shield, multiple infrared emitting tubes are positioned equidistantly, with an equal number of infrared receiving tubes arranged similarly on the opposite side. Each infrared emitter aligns directly with a corresponding infrared receiver and is installed along the same straight line. When unobstructed, the modulated signal (light signal) emitted by the infrared emitter successfully reaches the infrared receiver. After receiving the modulated signal, the corresponding internal circuit outputs a low level. However, in the presence of obstacles, the modulated signal emitted by the infrared emitter encounters difficulty reaching the infrared receiver smoothly. At this point, the infrared receiver fails to receive the modulated signal, resulting in the corresponding internal circuit outputting a high level. When no objects traverse the light shield, the modulated signals emitted by all infrared emitting tubes successfully reach their corresponding infrared receiving tubes on the opposite side, resulting in all internal circuits outputting low levels. This method enables the detection of object presence or absence by analyzing the internal circuit status.

Step 1: Establish the optical axis spacing (resolution) of the protective light screen

1. Consider the specific surroundings and activities of the operator. For instance, if the machine in use is a paper cutter, the operator accesses hazardous zones more frequently and is in closer proximity to them, increasing the likelihood of accidents. Therefore, opt for a smaller optical axis spacing for the light screen (e.g., 10mm) to safeguard fingers.

2. Similarly, if the frequency of entering hazardous areas is decreased or the distance is increased, consider protecting the palm (20-30mm).

3. If the hazardous area requires arm protection, opt for a light screen with a slightly greater spacing (around 40mm).

4. The maximum limit of the light screen is to protect the human body. Choose the light screen with the widest spacing available (80mm or 200mm).

This should be based on the specific machinery and equipment, with conclusions drawn from actual measurements. Pay attention to the disparity between the overall height and the protective height of the light screen. The overall height refers to the total appearance, while the protective height denotes the effective protection range during operation, calculated as: effective protection height = optical axis spacing * (total number of optical axes - 1).

The through-beam distance, measured between the transmitter and receiver, should be tailored to the machine's setup to select a suitable light screen. Additionally, consider the cable length after determining the shooting distance.

This should align with the signal output method of the safety light screen. Some light screens may not synchronize with the signals output by the machine equipment, necessitating the use of a controller.