Patent ID: 9688488
Date: 2017-06-27
CPC Classifications: B65G,G01F

Claim:
1. A metering feeder formed by inner and outer cylinders sharing a center line, having a gap between a bottom plate of the outer cylinder and a lower end of the inner cylinder, an annular transport space for a powder/granular material being provided between the inner and outer cylinders, an outer rotating ring provided along an inner periphery of the outer cylinder being connected to a tip end of a central rotating blade provided on an upright rotating shaft projected at a center part of the bottom plate, a plurality of outer rotating blades directed toward an inside being provided on the outer rotating ring, a rotating disc having an upper surface on the same plane as an upper surface of the bottom plate being provided, a powder/granular-material discharge groove concentric with the disc being formed on the upper surface of the rotating disc, the powder/granular-material discharge groove supporting the rotating disc on a support machine frame so that it is disposed over an inside and outside of the outer cylinder, the powder/granular material in the annular transport space being metered by the outer rotating blade and supplied to the powder/granular-material discharge groove by rotating the central rotating blade and the rotating disc in the same direction, and the powder/granular material being transported to an outside of the cylinder by the powder/granular-material discharge groove, the metering feeder comprising: a discharge opening provided in the support machine frame on an outer side of the rotating disc outside the outer cylinder, and in the powder/granular-material discharge groove of the rotating disc, a vertically-movable scraper for large supply, fitted with the powder/granular-material discharge groove for blocking the powder/granular material in the powder/granular-material discharge groove and for guiding it to the discharge opening and a fixed small scraper for small supply and for blocking a part of the powder/granular material in the discharge groove on a downstream side of the vertically-movable scraper and guiding it to the discharge opening are provided; and wherein the vertically-movable scraper is made capable of elevating between a lowered position fitted in the powder/granular-material discharge groove and a raised position away from the powder/granular-material discharge groove by elevating driving means; wherein outside the outer cylinder, on a downstream side of the fixed small scraper in the powder/granular-material discharge groove of the rotating disc, a loosening rod having a loosening portion for the powder/granular material on a lower end is inserted into and fixed to the powder/granular-material discharge groove from an upper surface side of the discharge groove; wherein an upward groove is provided on a lower surface of the outer cylinder at a position where the powder/granular-material discharge groove on a return side of the rotating disc passes so that the powder/granular material loosened by the loosening rod returns from the upward groove into the annular transport space; wherein on an outer peripheral surface of the outer rotating ring, a plurality of projections close to the inner periphery of the outer cylinder are provided, and a plurality of return spaces of the powder/granular material are formed between the adjacent projections; and wherein the powder/granular material returning into the annular transport space is filled in the return space through the upward groove and is made capable of being transported to a downstream side of the annular transport space by rotation of the central rotating blade.