The STOCK® gravimetric coal feeder weighs material on a length of belt between two fixed rollers (span) precisely located in the feeder body. A third roller, located midway in the span and supported at each end by precision load cells, supports half the weight on the span. As material passes over the span, the load cell generates an electrical signal directly proportional to the weight supported by the center roller.
The microprocessor processes readings of the amplified output of each load cell several times a second. Each input is converted into a binary number. These numbers are compared to parameters stored in the system memory and then against each other to test for validity. If the load cell outputs are within the expected range, each is individually converted into a single equivalent to weight per unit of belt length. Then they are added to obtain total weight per unit of belt length.
Belt speed is determined by sampling the period of the output of an AC Tachometer attached to the motor shaft. This period is converted into a binary number and is multiplied by a calibration factor to convert it into a belt speed signal. The microprocessor multiplies the speed and weight signal to arrive at the feeder output.
The microprocessor matches the feeder output to the demanded output by adjusting the feeder motor speed. In this manner, it corrects for changes in demand or material density.
Stock Feeders exceed the requirements of the NFPA 8503 Code to withstand 50 PSI explosion pressure.
Inlet size: 18" 24" 36"
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© 2007 Stock - Schenck Process Group
