Girls in electronics factories wear it, the principle of static bracelets!
Electrostatic bracelet is composed of conductive elastic band, movable snap button, spring PU wire, protective resistor and plug or crocodile clip. It is a small device used to release static electricity stored in the human body to protect electronic chips.
At present, the use of anti-static bracelets is still very common, but most people know little about the principle of anti-static bracelets. Next, the editor will introduce to you what is an anti-static bracelet, the working principle of the anti-static bracelet and how to use the anti-static bracelet.
01. Classification of anti-static bracelets
According to the type, it is divided into corded wrist strap, cordless wrist strap and intelligent anti-static wrist strap, and according to the structure, it is divided into single-circuit wrist strap and double-circuit wrist strap.
➤Antistatic Bracelet with Corded Wrist Strap:
The anti-static bracelet with a rope wrist strap is a kind of intimate contact with the wrist. It is worn on the wrist of the person to discharge the static electricity of the human body and avoid the interference of static electricity. The characteristics of this anti-static bracelet with a rope wrist strap are: safety and reliability, arbitrarily adjustable conductive outer strap, and cleaning resistance, and people can use it with confidence.
➤Antistatic Bracelet with Cordless Wrist Strap:
The principle of the cordless anti-static bracelet is to use the principle of corona discharge to dissipate part of the static electricity. Corona discharge, also known as tip discharge, means that after the conductor itself is charged, the accumulated charge exceeds 1500V. Its tip discharges the air to dissipate static electricity. However, the electrostatic voltage required for the dissipation of static electricity in cordless wristbands is too high, so it is not suitable for the electronics industry. After all, the withstand voltage of most components cannot withstand high voltages such as 1500V.
➤Smart anti-static wrist strap:
As an anti-static wristband, the smart wristband is made of high-tech materials. It is a combination wrist strap and static detector. The principle of the smart anti-static bracelet is that when the human body is in poor contact with the tester, it will automatically alarm. It replaces the functionality of traditional wristbands and gauges. As a new step of the electrostatic revolution, the intelligent anti-static wrist strap can improve production efficiency and quality assurance for further development of new organisms, and finally obtain products that meet environmental protection certification and electrostatic certification.
➤Single circuit wrist strap and dual circuit wrist strap:
The principle of the double circuit belt is: the double circuit wrist strap is equipped with a snap button on the outer side of the plastic block, and the snap button passes through the plastic block through a metal connector and connects with the conductive webbing on the inner side of the plastic block to form two independent circuit loops , the plastic block is divided into two pieces, left and right, and the two plastic blocks are hinged to each other, and the snap buttons on the outer surfaces of the two plastic blocks are respectively connected to the respective ground wire end buttons.
02. Requirements for wearing an anti-static bracelet
The anti-static bracelet is a supporting tool for safety production protection facilities. In order to ensure the smooth progress of production and the safety of operators, this specification is made for the use of anti-static bracelets for common compliance and implementation.
➤Before use, check whether the grounding wire has abnormal phenomena such as exposed strands and off-line, and check whether the surface of the alligator clip of the connecting wire is oxidized. At the same time, use a multimeter to check the resistance value and make a record: one The pen is connected to the crocodile clip, and the other is connected to the button in the wrist. The normal resistance value is about 1MΩ, so as to judge whether the contact is good, and deal with it in time if it does not meet the requirements.
➤The anti-static bracelet must be numbered, and the user should keep it properly. When it is not in use or suspended, it must not be placed arbitrarily, and it is not allowed to connect or disassemble parts at will. Regulators must conduct periodic inspections of usage.
➤In order to achieve the purpose of discharging static electricity, when wearing an anti-static bracelet, the wrist strap must be fastened to the wrist, and the grounding wire must be connected to the wrist strap to ensure that the metal block in the anti-static bracelet touches the human skin.
➤ After wearing the anti-static wristband, clip the crocodile clip of the cable to the ground wire.