LOSS IN WEIGH FEEDER

A loss-in-weight feeder is a type of industrial feeder that is used to accurately measure and control the flow rate of materials being fed into a process. In the Loss-in-weight feeder system the weight of the material in the hopper is continuously monitored and the feed rate is adjusted to maintain a constant weight.Loss-in-weight feeders are commonly used in a wide variety of industries, including food processing, pharmaceuticals, and chemical manufacturing. Loss in-Weigh Feeders operate on the principle of controlled loss-in-weight. The proposed system comprises of a Weigh Hopper, Loadcells, Screw Conveyor with motor and associated control electronics. The Weigh Hopper and Screw Conveyor are mounted on 3 Nos. of Loadcells. The Loadcells are connected to a controller through a junction box. The material from the storage hopper is fed to the weigh hopper, which is controlled by a gate. A small screw feeder is mounted below this weigh hopper. The weigh hopper and screw feeder are mounted on high precision Loadcells and the output of the Loadcells are summed in a junction box and fed as an analog input to the controller. The controller calculates the rate, compares with the set rate and feeds the corresponding 4-20mA signal to the VVVF drive to control the speed of the motor of the screw, thereby controlling the rate of discharge.