Feeding machine  is a general sense, but because each of the local names are different, so different names, and its essence and function, is basically the same.
The feeding machine can be divided into:
Double screw weight-loss metering feeding machine
Trace loss type feeding machine
Volume type feeding machine
Trace weight-loss metering feeding machine
Single screw weight-loss metering feeding machine
Double screw feeder loss
The weight loss of single screw type feeding machine