摘要 |
Apparatus and method to inject an air stream with dry ice or other sublimable particles to be blasted against a surface to be cleaned. An air lock assembly ( 20 ) with an air stream passage ( 21 ) and an intersecting conveyor passage ( 13 ) that has an endless cable conveyor assembly ( 38 ) passing through it. The conveyor ( 38 ) passes through a hopper ( 30 ) of dry ice particles before entering the air lock ( 20 ) and injecting the air stream with dry ice particles. V-seals packings ( 18 ) are provided as a means of limiting air form escaping from the points where the conveyor ( 38 ) enters and exits the air lock assembly ( 20 ). An adjustable speed motor ( 10 ) drives the conveyor ( 38 ) thereby giving an adjustable control of the ratio of dry ice to air.
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