The necessity of electronic pound lightning protection:
1. Weighing display instrument housing should be grounded. therefore. A grounding pile is set in the grounding scale room, and is connected with the reinforcement mesh (grounding) in the foundation of the scale. When a plastic shell is used, a metal film should be sprayed on the inner surface of the shell and then grounded.
2. Electrostatic induction, that is, the change of the ground atmospheric electrostatic field caused by lightning, causes the conductors near the lightning receiving object to generate induced charges, and constitutes an extremely high potential difference to the ground (grounding is connected to the ground of the embedded board ground, and the electronic truck scale platform is formed. Low electrical difference).
3. Electromagnetic induction, that is, the current in the lightning channel changes with time, forms a changing electromagnetic field in the space around it, and generates an induced voltage and eddy current on the conductive object attached to the channel.
Scales lightning protection measures:
1. The metal threading tube that runs through the signal cable must also be connected to the grounding grid.
2, the junction box to ground. Junction box to set the grounding line and scale body connected.
3, each sensor should have protective grounding. Therefore, a grounding wire should be set for each sensor position, and a grounding pile should be set between the sensor and the ground. The grounding wire should be reliably connected to the grounding pile or the grounding wire must be connected to the nearest anchor bolt.
4. The entire weighing platform should be grounded. Use one or several grounding cables to connect the scale body to the grounding pile. The grounding pile should be in the zero zone where the potential is constant, and the grounding resistance is less than 4.
5. Lightning rods should be set above the scale body to neutralize the charges in the cloud clusters with the tip discharge effect so that the electronic truck scales will not be damaged due to lightning strikes.
6. Electromagnetic radiation is formed by the rapid change of current in the lightning channel. Since the electronic truck scale is only resistant to low pressure, the above-mentioned three kinds of physical processes caused by lightning are the parts of the electronic truck scale.
7. The shield of the load cell signal cable must be grounded. When the electronic truck scale is powered by the city power grid, there is a long distance from the power distribution room to the installation site, and there is also a long distance signal cable from the weighing platform to the scale room.
Vacuum-formed plastic is used to produce a variety of custom design parts.Vacuum forming become to be a popular and cost-effective solution for a wide range of plastic forming needs.
The product's application must be taken into consideration while selecting the material. Normal vacuum forming plastic included:Polyester, HDPE, LDPE, PVC,PETG,polypropylene, polystyrene, ABS, acrylics, polycarbonate, ASA as well as other ABS capped acrylic and ABS capped polycarbonate.
ABS plastic also named Acrylonitrile Butadiene Styrene,is the most widely used in vacuum forming and available in a range of textured, smooth and embossed finishes, offered in virgin, recycled,UV resistant and flame retardant grades(UL94-V0). As good impact resistance ABS usually is vacuum formed for vehicle,equipment,plastic tray and so on industrial.
HIPS plastic also named High Impact Polystyrene ,is most used in Point of Sale (POS), display and signage market due to its visual appearance (colour options, gloss level, texture), the ease with which it can be processed along with its antistatic and electrical conductivity.
HDPE plastic also named High-Density Polyethylene,is widely used in indoor and outdoor applications including bottles, playground equipment packaging and furniture. It is a plastic with high tensile strength, and good chemical and corrosion resistance.And it has properties of recycling,UV stabilised, improved impact resistance.
PP Plastic also named Polypropylene,is similar to PE. But PE is more harder more heat resistant.But PP is more durable.Mostly plastic tray is produced by PP plastic.
PMMA plastic also named acrylic or glass fiber.It has properties of tensile strength, transparency, polishability and UV tolerance but less impact strength.It is available in clear, antiglare, opal, white, and frosted.It is best choice for windows, displays or see-through enclosures.
PETG named Polyethylene Terephthalate Glycol is another clear rigid plastic sheet.PETG is easily vacuum formed, printed, bonded and polished. As its' excellent clarity and impact resistance, it is widely used in outdoor application.
PC named polycarbonate, has combined advantage of PMMA and ABS. Usually is transparency and semi- transparency. It is expensive but that is best choice for clear plastic vacuum forming.
ASA is one new material which has all good properties of ABS. But much good UV resistant for outdoor usage. It usually be used for radome,air conditioning housing etc outdoor products.
Meanwhile, ABS capped acylic combined the good properties of ABS and acylic. ABS capped polycarbonate combined the good properties of ABS and polycarbonate.If you need high glossy surface for your design,then this is your only choice.
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