| 摘要 |
A container (10) comprising a trough (23) is filled with pulverous or granular material, for example a neutralizing agent for sulphuric acid. At the place where the container (10) is used, for example on a waste gas cleaning apparatus, a subassembly (27') is pushed through an opening (20). The subassembly (27') comprises substantially an axial feed member (29) having the form of a helical spring, a loosening member (31), a rotatable shaft (33), and a coupling member (35). When rotational motion is transmitted from a drive to the coupling member (35) the screw (39) is rotated and the loosening member (31) which is periodically pressed by the trough (23) against the screw (39) loosens the granular or pulverous material, so that it glides towards the axial feed member (29). The axial feed member (29) transports the material from the interior of the container (10) to the outlet (53). When the container (10) is empty, the subassembly ( 27') is removed and inserted into a new container (10). The old container may then be discarded.
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