All who drive have seen them, the signs on the highway that say “weigh station” . Why, you might ask, do trucks have to be weighed? Trucks have to be weighed in order for their taxes to be assessed according to how much weight per axle or by gross weight. It is because of this that weigh stations exist and why accurate truck scales have been engineered. The scales are open 24 hours a day, 365 days of the year and they handle approximately 200 trucks a day. Weigh stations are playing an important role in safety, as the government uses this information to determine how much weight each truck carries, and if they are hauling more than they should . The amount of weight varies from state to state but the standard is 34,000 pounds.
The Weight Of A Truck Is Determined In Several Ways-
- Axle weight= This is the amount of weight carried by each axle.
- Gross weight= This is figured by the combined weight of all of the truck’s axles.
Truck scales must be tough enough to take continuous abuse . Although the standard load is 34,000 pounds, Commonwealth Industrial Services truck scales are made to support up to 200,000 pounds , which is one reason that their truck scales are the preferred weigh stations in Virginia. All truck scales are made of steel and concrete, but the story doesn’t stop there.
There Are Three Types Of Scales-
- Load cell scales– Each cell is comprised of a strong material such as steel and/or concrete with one strain gauge embedded in the cell. The strain gauge is made of wires that send a current when the gauge is compressed by the weight of the truck being weighed. These signals are then sent to a junction box where variations in the current signals are used to calculate the weight of the truck that is sitting on the scale.
- Bending plate scales– These consist of two metal plates, with strain gauges attached to them. When the truck sits on the scales, the plates are subjected to stress and this is registered by the strain gauges. This information ,again, determines the weight of the truck.
- Tension (Piezoelectric) scales– This type uses a series of piezoelectric sensors. When the truck is on the scale, the sensors measures the voltage variations. This, in turn, is used to calculate the weight .
There Are Three Ways of Weighing Trucks-
- One axle- The truck is driven over one set of scales, and is stopped when a set of wheels rests on the scale. The total for all sets of wheels gives the gross weight.
- One Stop weighing– a set of scales is positioned carefully and is connected to one electronic controller. The axle weights that are obtained by this method are then added together to give the gross weight of the truck.
- Weight in motion (WIM)– In this method, a series of sensors are embedded in a sensor pad. The weight of each axle is gleaned as the truck drives over the sensor pad. In this method, the truck doesn’t even have to stop.
The more that you understand of the technology involved in weighing trucks, the more you can trust and appreciate the work of Commonwealth Industrial Services . Why not speak with their professionals to discover ways in which CSI can be of help to your business.