Pressurized abrasive cleaning device.

摘要

An improved device (1) for pressurized abrasive cleaning surfaces and simultaneously recovering all the spent abrasive particles and debris removed from the surface. A venturi nozzle (13) adapted to be connected to supply of pressurized air containing abrasive particles is mounted within a cylindrical blast tube (15). The blast tube extends beyond the nozzle and generally throughout the length of a vacuum chamber (30) formed within a vacuum cone (20) that is mounted on and extends concentrically about the blast tube. A cast urethane work ring (47) is movably mounted on the outer end of the vacuum cone by a gimbal ring (41) and flexible sealing duct (48). An exhaust tube (31) adapted to be connected to a source of suction is connected to the vacuum cone to provide a vacuum within the cone. The blast tube protects the blast pattern of abrasive particles and pressurized air after leaving the nozzle and passing through the vacuum chamber and directs it in a confined effectively large and efficient pattern against the surface being cleaned. The work ring traps the spent abrasive particles and debris which is removed from the work ring and vacuum chamber through the exhaust tube. The work ring has an outer edge (74) shaped to match the contour of the surface being cleaned and is moved along the surface by rollers (53) mounted on the work ring holder (35).