CONTRACOR
®
Version 4.2
10
3. General information
3.1. General information.
Contracor abrasive blast cabinet encloses the blasting environment to provide efficient
blast cleaning while maintaining a clean surrounding work area.
Production rates of the blast cabinets are dependent on size of nozzle, compressor
capacity, working pressure, type and size of abrasive media and distance between the nozzle
and the cleaning surface.
Contracor suction type blast cabinets consist three modules:
1. Ruggedly built welded steel cabinet enclosure.
2. Cyclone reclaimer for maximum efficiency in controlling media recycling.
3. Dust collector with high efficient fan and pulse cleaned cartridge filter.
3.2. Theory of operation.
When the air supply is on, and the cabinet doors are closed, the blast machine is
ready for operation by actuating the foot pedal. Fully depressing the foot pedal causes air
to flow through the blast gun. Air moving through the gun draws media into the blast gun
mixing chamber. The media mixes with the air and is propelled out the nozzle.
After striking the object being blasted, the blast media, along with fines, dust, and by-
products generated by blasting, fall through the mesh screen into the cabinet hopper. These
particles are drawn into the reclaimer for separation. Dust and fines are first separated
from the reusable blast media. Next, the media is screened of oversize particles, and held
in the reclaimer hopper for reuse. At the same time, dust and fines are drawn through the
reclaimer into the dry filter or dust collector, which traps the dust and discharges clean air.
When the foot pedal is released, the blasting stops.
The dust collector filter cartridge is cleaned by a pulse of high velocity compressed air
expanding against the inner surface of the cartridge. An electronic timer controls the time
intervals between the pulses. The expanding air momentarily reverses airflow through the
