Pulverulent material feeder apparatus

摘要

A pulverulent material feeder apparatus includes a bottom plate extending horizontally and inner and outer cylinders disposed on the bottom plate in a coaxial relation. These cylinders define therebeween a material transporting space. A material extruding gap is formed between a lower edge of the inner cylinder and the bottom plate. The apparatus further includes a rotatable annular member connected to a rotatable shaft mounted at the coaxial center by means of spokes so that the annular member is disposed along the inner periphery of the outer cylinder and a gap adjusting cylinder which is disposed along the outer periphery of the inner cylinder and adapted to be adjusted with respect to the vertical position thereof for thereby making it possible to adjust the size of the extruding gap. The gap adjusting cylindrical member is formed spirally substantially over a whole circumference thereof with an inclination relative to the plane of the bottom plate so that the material extruding gap is minimum at a position adjacent to the material discharge port and is progressively enlarged, starting from the minimum gap portion, in a direction in which the spokes are rotated. The bottom plate may be formed in a cone-like configuration having a center portion protruding upwardly and a lower periphery so that a pulverulent material charged into the inner cylinder can be expelled radially outwardly to the last bit by sliding downwardly on and along the bevelled surface of the bottom plate.