METHOD AND APPARATUS FOR PREVENTING ADHESION OF DUCT TO SHOOT

PROBLEM TO BE SOLVED: To eliminate the need for removing adhered powder using manpower or a removing apparatus by securing a natural rubber plate to the upper part of an inclining shoot through a fixing bar and providing a bar for the gap at the intermediate part between the fixing bar and the part where a falling powdery material collides against the natural rubber plate. SOLUTION: A natural rubber plate 1 is secured to the upper part side of a shoot 3 through a fixing bar 2 such that the natural rubber plate 1 is parallel with the shoot 3. On the upstream side of a powder material supply section 5, a bar for the air gap is interposed between the natural rubber plate 1 and the shoot 3. When a powder material is supplied to the position of the powder material supply section 5, the natural rubber plate 1 oscillates freely due to tree fall impact of the powder material which is thereby rocked downstream thus preventing adhesion of the powder material. When the natural rubber plate 1 is locally abraded, it is shifted up and down or inverted so that an unabraded part will come at the powder material supply section 5.