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Subject: Re: belt weighers
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Date: 11/26/00 at 5:14 PM
Posted by: r suffi
In Reply to: Re: belt weighers posted by Jos Van den berge on 11/23/00 at 7:07 AM:
Whether or not the actual speed of the belt is measured or programmed as a fixed value depends on the manufacturer of the scale. Most manufacturers use a wheel type assembly which rides on the return side of the belt. I believe this type to be the most accurate(this assumes the conveyor belt is in good condition with a minimum of splices that may cause the wheel to "jump" off the belt when a splice passes by.) Belt slippage in this case would be accounted for as the wheel is always riding on the belt and sensing a decrease in speed as the belt slips.Some manufacturers use an encoder connected to the tail pulley on the system(belt slippage in this case would certainly affect accuracy.) I have also seen belt scales where no speed sensor is used at all and the belt speed is programmed at setup as a fixed value. I think this to be the least accurate measurement as the belt speeds generally slow down as a load is applied to the belt.
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