GRAVIMETRIC METERING UNIT

1 . A gravimetric metering unit for bulk material, having a metering means having a container for bulk material to be metered and a base unit, wherein the base unit has a conveyor channel that feeds into an outlet line of the metering unit via a connection device having a flexible sealing element, and wherein the conveyor channel can be operationally connected to the outlet line and detached again therefrom via the connection device,

wherein the connection device has a magnetic securing arrangement for the operational connection of the sealing element at least to either the outlet line or the conveyor channel or to both.

2 . The gravimetric metering unit according to claim 1 , wherein the magnetic securing arrangement has a mechanical positioning arrangement for positioning the flexible sealing element in the connection device in its operating position and a magnetic fixing arrangement for magnetically fixing the flexible sealing element in the operating position.

3 . The gravimetric metering unit according to claim 1 , wherein the mechanical positioning arrangement has stop elements on the flexible sealing element and further stop elements which are designed to be diametrically opposed to the stop elements on a connection piece, arranged on the outlet line, or on a carrier arranged on the base unit, which determine the operative relative position of the flexible sealing element on the connection piece or on the carrier.

4 . The gravimetric metering unit according to claim 3 , wherein the stop elements have positioning pins, and the stop elements which are designed to be diametrically opposed have openings which are designed to be diametrically opposed to the positioning pins.

5 . The gravimetric metering unit according to claim 3 , wherein the stop elements have openings provided in the flexible sealing element, and the diametrically opposed stop elements have positioning pins which are fixed relative to the connection piece or the carrier.

6 . The gravimetric metering unit according to claim 4 , wherein the flexible sealing element has securing portions having openings for positioning pins.

7 . The gravimetric metering unit according to claim 1 , wherein the flexible sealing element is designed as a bellows.

8 . The gravimetric metering unit according to claim 6 , wherein the flexible sealing element is designed as a bellows, wherein the securing portions are designed as a flange projecting radially from the bellows, wherein a flange is provided at least at one end or at both ends of the bellows.

9 . The gravimetric metering unit according to claim 2 , wherein the magnetic fixing arrangement has a magnetic effective region on the flexible sealing element and, arranged diametrically opposed, a magnetic effective region on a connection piece, arranged on the outlet line, or on a carrier arranged on the base unit, which effective regions operatively fix the operative relative position of the flexible sealing element on the connection piece or on the carrier.

10 . The gravimetric metering unit according to claim 9 , wherein the flexible sealing element has securing portions, and the magnetic effective region on the flexible sealing element is formed by at least one magnetic fixing element which, in the operating position, encloses the securing portions between itself and either the connection piece or the carrier and thus operatively fixes the flexible sealing element in an operative position, wherein the fixing element in turn is held magnetically in its position.

11 . The gravimetric metering unit according to claim 9 , wherein the one magnetic effective region is formed by positioning pins designed as magnets.

12 . The gravimetric metering unit according to claim 6 , wherein the magnetic securing arrangement has a mechanical positioning arrangement for positioning the flexible sealing element in the connection device in its operating position and a magnetic fixing arrangement for magnetically fixing the flexible sealing element in the operating position, wherein the magnetic fixing arrangement has a magnetic effective region on the flexible sealing element and, arranged diametrically opposed, a magnetic effective region on a connection piece, arranged on the outlet line, or on a carrier arranged on the base unit, which effective regions operatively fix the operative relative position of the flexible sealing element on the connection piece or on the carrier, wherein the one magnetic effective region is formed by positioning pins designed as magnets, wherein the positioning pins designed as magnets are arranged at least either on the connection piece or on the carrier or on both, extend from one side through the openings provided on the flexible sealing element for the positioning pins, and, further, on the other side of the openings, at least one magnetic fixing element is provided, which encloses the securing portions of the flexible sealing element between itself and the connecting piece or between itself and the carrier and, magnetically fixed to the magnet, in turn fixes the flexible sealing element in an operative bearing.

13 . The gravimetric metering unit according to claim 6 , wherein the magnetic securing arrangement has a mechanical positioning arrangement for positioning the flexible sealing element in the connection device in its operating position and a magnetic fixing arrangement for magnetically fixing the flexible sealing element in the operating position, wherein the magnetic fixing arrangement has a magnetic effective region on the flexible sealing element and, arranged diametrically opposed, a magnetic effective region on a connection piece, arranged on the outlet line, or on a carrier arranged on the base unit, which effective regions operatively fix the operative relative position of the flexible sealing element on the connection piece or on the carrier, wherein the one magnetic effective region is formed by positioning pins designed as magnets, wherein the positioning pins designed as magnets are arranged on the fixing element and extend from one side through the openings for the positioning pins provided on the flexible sealing element, and, further, on the other side, magnetically effective openings are provided in the connection piece or the carrier, wherein the fixing element encloses the securing portions of the flexible sealing element between itself and the connection piece or the carrier and, magnetically fixed to the openings, in turn fixes the flexible sealing element in an operative bearing.

14 . The gravimetric metering unit according to claim 3 , wherein the magnetic fixing arrangement has magnets which are separate from the mechanical positioning arrangement and are arranged in the connection piece or in the carrier, and the fixing element is designed to be magnetically effective, and wherein said fixing element encloses the securing portions of the flexible sealing element between itself and the connection piece or between itself and the carrier and, magnetically fixed to the magnet, in turn fixes the flexible sealing element in an operative bearing.

15 . The gravimetric metering unit according to claim 10 , wherein the magnetic fixing element is designed as a ferromagnetic ring.

16 . The gravimetric metering unit according to claim 10 , wherein the fixing element has magnets.

17 . The gravimetric metering unit according to claim 10 , wherein the fixing element has handles.

18 . The gravimetric metering unit according to claim 1 , wherein the conveying channel is arranged horizontally.

19 . The gravimetric metering unit according to claim 1 , wherein the end, facing the outlet line, of the sealing element is located in the conveying direction at or behind the end, facing the outlet line, of the conveying channel, such that the bulk material flow output from the conveying channel during operation does not reach the sealing element.