DRY-ICE PELLET BLASTING METHOD AND APPARATUS FOR CARRYING OUT SAME

摘要

The invention relates to a dry-ice pellet blasting method for the pulsed cleaning of objects by means of a gas stream (6) entraining dry-ice pellets, wherein the dry-ice pellets are produced by compacting CO2 snow and are subsequently introduced into the gas stream (6) and accelerated, and the gas stream (6) entraining dry-ice pellets is output via a jet outlet nozzle and thus acts on the object to be cleaned, wherein the dry-ice pellets are formed from CO2 snow in a compacting device (16) by mutually meshing compacting wheels (18) with an axial passage opening (26) in at least one compacting wheel (18), in that outwardly projecting protrusions (20) on one compacting wheel (18) are engaged with and disengaged from complementary compacting recesses (22), opening substantially radially towards the inside into the passage opening (26), in the other compacting wheel (18) as the compacting wheels (18) roll against one another, such that CO2 snow that has been introduced into a gap (28) in the mutually meshing compacting wheels (18) is compacted into dry ice as a result, and the dry ice is pressed radially inwardly into the relevant passage opening (26) and is broken into dry-ice pellets; the method is characterized in that the gas stream (6) is guided through the passage opening (26) in at least one or preferably two mutually meshing compacting wheels (18), such that the dry-ice pellets that are pressed radially inwardly into the relevant passage opening (26) are fed directly to the gas stream (6) and entrained thereby, such that the dry-ice pellets are produced only while the blasting method is being carried out.