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Hasler - Model RBP -Loss-in-Weight Gravimetric Feeders
The feeders work using the principle of controlled Loss-In-Weight. The hopper with its extraction device (screw) is installed on a weighing system giving continuously to the controller the measure of weight. The loss of weight by time unit (measuring sampling time) represents the actual proportioning flow rate.
Regulation :
The controller compares the actual measured flow to the setpoint and calculates the drive command signal to be sent to the screw speed controller.
The corrective actions made are saved and reflect the volumetric behaviour of the system.
Refill :
The continuous measure of weight in the hopper allows, according to two configurable thresholds (high and low), to manage the refill system(s) feeding the hopper.
During this refill phase, the screw speed is controlled according to its volumetric efficiency, memorized during the previous controlled emptying phase(s).
(~ 10 time of the max flow rate)
- Gravitational
- Vibrating float,
- Fluidized float,
- Flow control gate,
- Archimedean screw
- Big-bag, emptying station, etc.
The flowrate at the feeder discharge point is maintained constant by electronic controller SCM2* at the setpoint value. Detailed alarm informations are obtained via the display (SDU)
- Accuracy : ± 0,5 %
- Flow range from 12 l/h to 14 m3 /h
- Accuracy consistency
- Entirely tight system : no environmental impact
- Low maintenance
- No need for drop tests
- Few wear parts
- Manual or automatic refill
- Horizontal stirrer in lower part that ensures material homogeneity. (Option: vertical stirrer for poor flowing products)
- Bearing at screw outlet for a better centering in the tube (less cantilever).
- Enforced tightness by glands, chicanes, and 4 teflon braids.
- Inspection door in lower part for eventual replacement of horizontal stirrer without dismantling the whole feeder.
- Execution: Steel S235-JRG2, stainless steel 304 and 316
- Vertical stirrer
- Forced fan P>0,55 kW
- Inlet counter flange
- Outlet counter flange
- Digital load cells
- High level probe
- Junction box for motor
- Support feet
- Feeding gate
Dosing :
- Ground slag
- Anhydrite
- Silicium fumes
- Coke fines
- Plaster
- Starch
- Filter
- Dust
- Cement
- Lime