Refinements in air-quality protection and seal control, in a par

Conveyors: fluid current – With diverse power-driven conveyor – Rotary

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406 64, 406 68, 222367, B65G 5346

Patent

active

059158875

ABSTRACT:
Dust emission is controlled by a preferably short fill at the expulsion end of each chamber, and selective venting of residual pressure through the air-inlet end. This selective venting is accomplished through use of a novel seal or "pad" that has an extension for tightly covering and sealing the material-exhaust end of each chamber while the chamber is in a dust-control plenum. The pad extension is notched so that it leaves the air-inlet end uncovered, permitting pressure venting through the notch and the air-inlet end. To provide truly effective sealing of the pad extension against the wear plate above the chamber that is in the plenum, the extension is reinforced by a strong metal plate which is embedded in the pad. Careful contouring of the main material-conveying ports in the pad optimizes the performance. A new all-pneumatic pad-clamping pressure-control system has been found to provide excellent control of pressure and uniformity of wear, with a minimum of working parts and adjustments.

REFERENCES:
patent: 3161442 (1964-12-01), Reed
patent: 5094403 (1992-03-01), Tschumi
patent: 5150991 (1992-09-01), Stoner et al.

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