Portable conveyor load measuring apparatus

Details Portable conveyor load measuring apparatus Portable conveyor load measuring apparatus

1974-09-13

1976-03-09

Spar, Robert J.

Conveyors: power-driven

Conveyor system for arranging or rearranging stream of items

By laterally or vertically moving successive items in...

198 39, 177 16, B65G 4308

Patent

active

039426254

ABSTRACT:
For measuring the load output of a lifting conveyor powered by a three-phase motor, electric measuring apparatus is coupled to the motor power supply conductors by voltage take-off leads and current transformers. Voltage and current, proportional respectively to motor supply voltage and current, are fed to a solid state watt transducer, which produces a millivolt output proportional to the total power consumption of the motor. The transducer output signal is fed to a solid state transmitter, which amplifies the signal, and which includes a zero output adjustment for producing a zero output for a selected input proportional to the motor load driving an unloaded conveyor. The transmitter output is fed to a solid state integrator through an intervening potentiometer which is adjusted to calibrate the apparatus to the length and lift of the conveyor. The integrator produces voltage pulses representative of a selected ton fraction, and it triggers a counter which records cumulative tonnage conveyed.
In alternative form the apparatus includes a nonlinear amplifier which modifies the transducer output signal to compensate for the nonlinear relationship between mechanical power output and electrical power input of the motor.

REFERENCES:
patent: 1125705 (1915-01-01), Messiter
patent: 3333649 (1967-08-01), Schafsteller
patent: 3561643 (1971-02-01), Klouen
patent: 3722660 (1973-03-01), Des Snead

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