In addition to batching hoppers GIMAT produces screw extractors or screw batchers and volumetric batchers with continuous dosing or batching. In this case the batching is done with volumetric precision.
Volumetric screw feeders
Volumetric Feeders fall into 3 categories:
Batch Feeders – by controlling time a weight batch (Kg) is dosed.
Rate Feeders – by controlling speed a variable speed rate (Kg/hr) is dosed.
Recipe Feeders – by controlling both speed and time a variety of recipes can be delivered already mixed.
The RPM of the screw feeders can be adjusted by means of:
Continuous mechanical variable-speed motors with manual or electrical control: Minimum flow rate equal to 1/5 of maximum flow rate.
Continuous hydrostatic variable-speed motors with manual or electrical control: Flow rate having maximum value of approximately 0.
Gearmotors with motors piloted by vector inverters and additional power ventilation, when necessary, with minimum flow rate equal to at least 1/10 of maximum flow rate.
Continuous volumetric feeders from 3 dm³/h to 40 m³/h.
(depending on the spirals/screws and reduction ratios used, from 1800 g/h to 21’000 kg/h considering a density of 0.6 kg/dm³).
Upon request the volumetric feeder can be designed and built in conformity to ATEX Directive 94/9/CE for Zone 2-22 / Zone 1-21