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Endless conveyor belt load measurement system and method of automatically calibrating same

  • US 3,976,150 A
  • Filed: 10/24/1974
  • Issued: 08/24/1976
  • Est. Priority Date: 12/07/1973
  • Status: Expired due to Term
First Claim
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1. Apparatus for automatically calibrating an endless conveyor belt load measurement system comprising the combination of:

  • a. movement measuring means having a digital pulse output (Ps) for measuring the movement of the conveyor belt,b. means to determine one complete revolution of the conveyor belt,c. scale means having a digital pulse output (Pw) adapted to measure the weight of successive portions of the conveyor belt and the load carried thereby,d. hoist means for automatically successively applying at least three calibration weights of known values (Ti) to the scale means while the conveyor belt is empty, the three weights being respectively representative of lower, medium and upper ranges of the scale means, ande. means connected to receive the digital pulse outputs of the movement measuring means and the scale means, the digital computer means adapted to;

    i. calculate the average pulse output of the scale means during one complete revolution of the empty conveyor belt (Pw0),ii. calculate the average pulse outputs (Pwi) of the scale means during one complete revolution of the empty conveyor belt with each of the calibration weights respectively applied to the scale means, andiii. substitute the said calculated average pulse outputs of the scale means into a set of curve fitting equations to calculate a set of linearization coefficients and then to substitute the said calculated linearization coefficients into formula to calculate the load carried by the conveyor belt.

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