Continuous gravimetric Dosing of powdered Products AZODOS Product Family

Product

Continuous gravimetric Dosing of powdered Products AZODOS Product Family

AZODOS type P ... DV dosing unit is used for volumetric metering of powdered products in weighing and finishing processes. The machine can be used in the food, pharmaceuticals, chemicals and plastics industries for feeding production processes with a constant mass flow in coarse or fine flow.

By adding a weighing device, the machine can be extended to form the AZODOS® type P... DW dosing system for gravimetric feeding of processes. The machine can be used as loss-in-weight scales to dose small quantities into the downstream system with gram accuracy. The AZODOS® P... DW is used with the AZO®CONT dosing controls for feeding continuous gravimetric processes, resulting in a DDW loss-in-weight feeder.

Key Advantages

  • stainless chrome nickel steel design with various surface finishes
  • high grade dosing screws
  • easy-to-clean system for rapid changeover of components
  • compact design
  • easy to extend thanks to modular design
  • maximum dosing accuracy thanks to coarse/fine dribble feed
  • double screw version for bulk materials with poor flow properties
  • a range of screw geometries, adapted to product properties
     

AZODOS® Type P ... DW

  • used as loss-in-weight feeder
  • precise online adjustment control and quick correction in case of any deviations from
  • target values
  • absolute weight registration
  • no falsification due to bulk density fluctuations
  • no intricate calibration work
  • measurement value logging with high resolution
     

Operating principle of AZODOS® type P ... DV, DW, DDW

The AZODOS® Type P ... DV operates in volumetric mode. The powder bulk products flow out of the supply hopper into the dosing screw. An agitator is used to ensure uniform discharge. With a frequency-controlled motor, the dosing screw can be switched from coarse to fine flow for precision dosing in the downstream weighing process.

In the case of dosing scales, the basic machine is mounted on a platform load cell or integrated in a 3-point weighing frame. It can be mounted in a frame structure on the floor or suspended from the ceiling. The dosing screw meters the bulk material in coarse/fine flow to the downstream process. The amount of product that is metered out of the AZODOS® is weighed. The system operates gravimetrically in accordance with the negative weighing principle.

The AZODOS® type P ... DW becomes a loss-in-weight feeder if an appropriate control system (e.g. AZO®CONT) is provided. The bulk material is discharged by the dosing screw and the resulting loss in weight per unit of time is registered by the weighing and control system. The actual loss in weight per unit of time (actual throughput) is compared against the required setpoint, which is defined by the downstream process, e.g. extruder. Differences between the actual decrease in weight and the decrease in target weight over time are corrected by adjustments to the batch controller's throughput.

Once the product reaches a predefined level in the AZODOS®, the control process is paused briefly and the surge bin is refilled. During the refill time the dosing screw output is set to a value based on empirical weight and output data gained from previous dosing cycles.