The two-box thermal shock test chamber is used for electrical components, automation components, communication components, auto parts, metals, chemical materials, plastics, etc. Through the physical changes of defense industry, aerospace, ordnance industry, BGA, PCB substrate, electronic chip IC, semiconductor ceramics and polymer materials, it can test the repeated low tension of the material to high and low temperature, and the chemical changes or physical damage of the product in the thermal expansion and contraction of the product, to confirm the quality of the product. From precision IC to heavy machinery components, no one does not need its ideal test tool, but do you know how to prevent static electricity in the two-box thermal shock test chamber in operation? This article will share with you the countermeasures and methods for preventing static electricity during the operation of the two-box thermal shock test chamber:
1. Countermeasures to prevent electrostatic disasters
(1) Electrostatic disasters
(2) Generation of electric charge
(3) Accumulation of electric charge
(4) Discharge phenomenon
(5) Flammable substances
If one of these conditions are eliminated, disasters can be prevented. It is important to accurately judge which of these four parts to stop and take appropriate countermeasures. As a basic measure to prevent electrostatic disasters, we plan to introduce specific methods from the viewpoint of preventing and suppressing electrostatic.
2. Methods of restraining electrostatic
(1) Inhibit the generation of electrostatic in the operation of thermal shock test equipment: Since the source of electrostatic is friction or separation between objects, these effects should be suppressed as much as possible. For example, in operations such as liquid pipeline transportation, dust air transportation or plastic extrusion, the best way is to reduce the speed. In fact, this will affect work efficiency. The safe flow velocity of petroleum is below 1m/s. Electrostatic differs in charge or polarity due to different substances. Therefore, a feasible measure is to avoid using insulators which are easy to charge, and use materials that are difficult to generate electrostatic by combining them.
(2) Promote leakage of electric charges: In disaster countermeasures, the easiest way is ground connection. This method is to make the generated charge quickly disappear to the earth through the metal conductor. However, with this method, if the charged body is conductive, it can be easily eliminated, while the plastic, chemical fiber, petroleum and other insulators have little effect because the charge of the charged part is difficult to move.
(3) Add conductive material to the object: This includes adding metal powder or carbon black to tires or operator's boots and floor materials in chemical plants, and using hydrophilic oils in chemical fibers or plastics to prevent electrification. If the relative humidity in the air is increased, a water-absorbing layer will be formed on the surface of the object to enhance conductivity, and it will hardly be charged at a humidity above 80%. For this reason, in places where there is a possibility of charging, you can increase the chamber temperature humidity adjustment device or spray water to increase the humidity. But the problem is that people may feel unwell, or have an adverse effect on equipment and products.
The above are the countermeasures and methods about how to prevent static electricity in the operation of the two-box thermal shock test chamber.