Metering device for plastic raw materials
AssigneeFilterwerk Mann & Hummel GmbH
InventorWalter Mucke
Life of this patent
Estimating the term…
Abstract
A device for the metering of plastic raw materials of granulate, or pulverulent, or highly viscous consistency in connection with plastic materials processing machines, where a rotating metering disc at the bottom of a drum-shaped receptacle discharges fixed amounts of material at a predetermined frequency, and where the semi-circular metering pockets on the periphery of the metering disc are wiped clean by a vertically extending radially and circumferentially flexible wiper finger which dislodges any material that might otherwise adhere to the pocket flanks at the point of gravity discharge of the plastic material from the metering pockets.
Claims19
A device for metering granulate, or pulverulent, or highly viscous materials, particularly plastic raw materials which are being fed to a plastic material processing machine, the device comprising in combination:
- a receptacle having a bottom section and a side wall arranged to return therein a supply of raw material;
- a metering disc rotatably arranged in the bottom section of the receptacle and having a substantially vertical rotational axis, said metering disc constituting at least a portion of a material retaining bottom wall of the receptacle;
- drive means for rotating the metering disc about its axis;
- a series of metering pockets disposed on the periphery of the metering disc in the form of angularly evenly spaced radially and vertically open recesses having substantially vertical flanks;
- a discharge opening in the receptacle bottom section, underneath the metering disc, at a location over which the metering pockets move and where the metering disc does not constitute a material retaining bottom wall of the receptacle;
- a side wall portion in the receptacle bottom section cooperating with the periphery of the metering disc in such a way as to form a stationary radial closure for the moving metering pockets, and a bottom wall portion of the receptacle bottom section cooperating with the lower side of the metering disc in such a way as to form a stationary bottom closure of the moving metering pockets;
- said radial closure and bottom closure of the metering pockets being interrupted in the area of the discharge opening, thereby allowing raw material contained in the moving metering pockets to be discharged therefrom by gravity;
- and
- radially movable wiper means arranged in the area of the discharge opening and engaging the periphery of the rotating disc so as to cooperate therewith and with the metering pockets by sliding along the contour of the pocket flanks, as each metering pocket passes over said opening, thereby dislodging from said flanks any residual raw material adhering thereto.
Dependencies are inferred from the claim text.