Siemens Milltronics L-300 Instruction Manual page 12

Screw Conveyor
short pitch
double flight
Rotary Feeder
Bucket Elevators
Conveyor Belt
Drag Conveyor
Vibratory Feeder
motor
vibrating pan
Page 8
• most common type of material feeder
• short pitch and/or double flight screws preferred to
reduce the batch size (and increase the frequency) of
the material discharge pulse, or cut back the flights of a
standard screw so it ends before the discharge opening
• use reverse flowguide transition for variable operating
speeds or constant speeds above 40 rpm
• provides an air seal between the upstream and/or
downstream process, and the flowmeter
• required if the material is pneumatically conveyed or
flowmeter/process isolation is required
• use reverse flowguide transition for variable operating
speeds or constant speeds above 10 rpm
• commonly used for grain applications
• feeder discharge damping required when slow
elevators (typically chain drive) produce heavily pulsing
material discharge
• use deadbox if required to reduce material velocity from
fast elevators (typically re-inforced belt drive)
• produces a non-pulsing material discharge
• reverse flowguide transition (and/or material discharge
material
baffle) often required for variable belt speeds or
discharge
baffle
constant speeds in excess of 1 m/s (200 feet/minute)
• operates at a constant (and relatively low) velocity
• reverse flowguide transition not normally required but
use feeder discharge damping or a discharge baffle to
minimize the pulsing material discharge
• produces a non-pulsing material discharge
• use reverse flowguide transition for variable speed
varieties
Milltronics L-300 – INSTRUCTION MANUAL 7ML19985EQ01