What is a safety light curtainWhat does a safety light curtain do

A safety light curtain is a key safety protection device, which is mainly used to monitor and prevent people or objects from entering the hazardous area. It consists of a photoelectric transmitter and receiver that detects whether a person or object has entered the hazardous area by emitting a beam of light and detecting the reflected light.

When a person or object enters the danger zone, the safety light curtain immediately sends a signal. This signal is usually processed by a safety controller and the corresponding safety measures are carried out, such as stopping the operation of the machine or plant. Safety light curtains are widely used in industrial production lines, robots, automated warehouses and other occasions that need to protect the safety of personnel.

The main functions of safety light curtains include preventing accidents, increasing productivity, and protecting equipment. By detecting people or objects entering the dangerous area in time, the safety light curtain can effectively prevent accidents and protect the lives of personnel. At the same time, because safety light curtains can protect the safety of personnel, automation equipment such as production lines can operate more safely and improve production efficiency.

In addition, safety light curtains protect machines and equipment from vandalism or damage.

Photoelectric protection device.

Installing and using the safety light curtain is as simple as connecting the power supply and controller. Therefore, the safety light curtain is a safety protection device that is easy to install and use.

In short, the safety light curtain is a very important safety protection device, which can effectively protect the life safety of personnel, protect the safe operation of equipment, and improve production efficiency.

To put it simply, the safety grating is to protect safety, this object mainly refers to people, such as punches, automation equipment, manipulators, shearing machines, etc., which may threaten the human body can use the safety grating, these equipment is equipped with safety grating, the safety grating has a protection range, and this range is also the range that may endanger human safety, once the body enters the danger range, it will cover the infrared rays of the grating, and the grating immediately sends out a shading signal to control the dangerous equipment to stop working to protect the safety of people. All hands played, no copy.

Introduction:Safety gratings are also known as safety light curtains, photoelectric safety protection devices, safety protectors, punch protectors, infrared safety protectors, etc.

How it works:The safety grating is mainly composed of a transmitter and a receiver, the transmitter is composed of a plurality of infrared emitting tubes arranged at equal intervals in the same straight line, the receiver is arranged by the infrared receiving tubes with the same number and spacing, each receiving tube on the receiver corresponds to the transmitter on the transmitter one by one, the transmitter and the receiver corresponding to the transmitter and the receiver are controlled by the internal circuit to emit infrared rays and receive infrared signals at the same time, and the first lamp to the last lamp is quickly polled and scanned in turn, A rectangular protective area is formed between the transmitter and receiver. When there is no object to block the protected area, the light curtain outputs a normal light signal; When someone or object enters the protection area, the infrared signal emitted by the transmitter is blocked, and the receiver cannot receive the infrared signal normally, and immediately outputs the machine stop signal, so as to play the role of safety protection.

What it does:In modern chemical industry, people and machines work together, and it is easy to cause personal injury to workers in some potentially dangerous mechanical equipment, such as stamping machinery, shearing equipment, metal cutting equipment, automated assembly lines, automated welding lines, mechanical conveying and handling equipment, and dangerous areas (toxic, high pressure, high temperature). The safety light curtain is installed on these dangerous equipment to effectively protect the personal safety of workers.

Safety light curtain is a protective device used for safety protection of mechanical equipment.

Function: It can effectively protect the safety of workers and reduce the occurrence of accidents. [ESPE].

The safety light curtain is to protect the sensor, and it is a pair of sensors that block the light to control the machine. For example, Yipu Optoelectronics.

The main function of the safety grating is that the emergence of the full grating reduces the occurrence of industrial accidents, so that every employee has a guarantee of life safety in production and operation, and no longer worries about danger in order to operate equipment.

It-Solid safety light curtains are OK. The main function of the safety light curtain is to protect.

The main function of Mote intelligent safety light grid is to protect manpower, the appearance of light grid reduces the occurrence of industrial accidents, and no longer worries about danger in order to operate equipment. For specific information, please refer to Mott's official website.

The current and voltage limiting part of the core component of the safety barrier, the core function of the safety barrier is to limit the energy leading to the hazardous area. So what is the principle of the safety barrier to achieve energy control?

First of all, we should understand the principle of Zener safety barriers. Although the actual Zener barrier will vary in the form of implementation, the basic circuit should be composed of a Zener tube, a fuse wire, and a current limiting resistor (which can also be nonlinear current limiting, which can be equivalent to a variable resistor).

The negative pole of the Zener tube is grounded (there is also a negative polarity safety barrier, and the positive pole is grounded), and the positive pole is connected to the middle point of the current limiting resistor and the fuse wire. One end of the fuse wire is connected to the safety zone, and one end of the current limiting resistor is connected to the danger zone. During normal operation, the voltage connected to the safety barrier is less than the reverse conduction value of the Zener tube (the leakage current needs to be less than 10UA under working conditions, such as 4-20mA transmitter), and the Zener diode does not affect the normal operation of the circuit (if necessary, the barrier capacitance and diffusion capacitance of the Zener diode need to be considered); When one end of the control room, due to a circuit failure, a series of ground, higher than the Zener diode Zener breakdown value voltage, such as 220V, the Zener diode through the current rapidly increases, resulting in a rapid increase in the current value through the fuse wire, when this value exceeds the rated value of the fuse wire, the fuse wire blows, so that the voltage in the field (danger zone) will always be lower than a certain limit value, this value is called UO, the highest open circuit voltage.

From this process, we know that most Zener barriers will self-destruct to achieve explosion protection in the event of such failures.

Most field devices are not allowed to short-circuit the power supply, which is another fault in the intrinsically safe explosion-proof system (some cases need to work in the case of a short-circuit in the field, such as switching input). According to Ohm's law, the current is equal to the voltage divided by the resistance, and when there is a short circuit in the field, the resistance in the field is zero or very small, and the current will appear to be a very large value, and if it is not limited, this value will likely ignite the atmosphere of the scene. The fuse wire is a current limiting element, but it takes time for the fuse wire to blow, from the occurrence of the short circuit to the fuse wire blowing, the short circuit current generated on the site may have enough time to ignite the atmosphere of the scene.

In addition, the rated value of the fuse wire in the safety barrier often exceeds the maximum allowable current value of the site environment at a certain voltage. Therefore, an in-barrier current limiting resistor is essential. Under the action of the safety barrier current limiting resistor, the maximum current value that may be generated in the field is called the maximum short-circuit current value IO of the safety barrier, usually the maximum short-circuit value is equal to the maximum open-circuit voltage value divided by the minimum current-limiting resistance value.

Therefore, the three most important equivalent components of Zener safety barriers, current limiting resistors, Zener diodes, and fuse wires, all play an indispensable role in Zener safety barrier circuits.

The main function of the safety barrier is to limit the entry of hazardous energy into the hazardous place in the safe place, and to limit the voltage and current sent to the dangerous place. Safety barriers are also known as safety retainers. The safety interface of the intrinsically safe circuit, which transmits electrical signals in both directions between the safety zone (intrinsically safe) and the danger zone (non-intrinsically safe) and restricts the transfer of energy from the safety zone to the danger zone due to faults.

Safety barriers, also known as safety energy limiters, are an important part of intrinsically safe systems. There are mainly two types of safety barriers: Zener safety barriers and isolated safety barriers. The main function of the safety barrier is to limit the current and voltage, and the silver mill ensures that the energy available to the field instrument is within the safe range.

The safety barrier is an energy-limiting circuit between the field equipment and the control room equipment, which is used to limit the electrical energy supplied to the field instrument in the control room to neither produce a spark sufficient to detonate the dangerous gas, nor the surface temperature of the instrument sufficient to detonate the dangerous gas, thereby eliminating the detonation source.