Surface applied abrasive cleaning apparatus and method

A system comprising:

• first and second blast processing devices, each blast processing device including
• a rotor assembly having a base and a top, the rotor assembly including:
• a shaft, extending from the base of the rotor assembly to the top of the rotor assembly, that rotates about a longitudinal axis of the blast processing device;
• a first lofting deflector and a second lofting deflector coupled to the shaft, each having a face pointing to the top of the rotor assembly, in a direction substantially parallel to the longitudinal axis, the first and second lofting deflectors to create a vortex of air along the longitudinal axis as the shaft rotates, the vortex to move particulate material along the longitudinal axis in the direction of the top of the rotor assembly, wherein the first lofting deflector is angularly offset in a circumferential direction from the second lofting deflector and axially offset along the shaft in a longitudinal direction from the second lofting deflector;
• and
• a first impeller and a second impeller coupled to the shaft, each impeller adjacent to a corresponding one of the first lofting deflector and the second lofting deflector, each extending radially outward from the shaft, each having a face pointing in the direction of rotation of the shaft, each impeller to project the particulate material away from the longitudinal axis;
• an operating chamber having walls to enclose the rotor assembly along the longitudinal axis, and a bottom portion proximate the base of the rotor assembly and a top portions proximate the top of the rotor assembly to determine a vertical size of the operating, the operating chamber having a target area opening in the walls through which the projected particulate material is directed toward a target;
• and
• angled deflectors connected to the operating chamber at the target area to direct particulate material projected through the opening toward a target, and to direct the projected particulate material back toward the rotor assembly to be lofted by the vortex to be subject to further projection,
• wherein the projected particulate material that strikes the target falls either back into the vortex to be subject to further projection, or strikes the deflector insert;
• wherein the first and second blast processing devices are positioned adjacent to each other, and process the same target.

An apparatus comprising:

• a rotor assembly having a base and a top, the rotor assembly including:
• a shaft, extending from the base of the rotor assembly to the top of the rotor assembly, that rotates about a longitudinal axis of the apparatus;
• a first lofting deflector and a second lofting deflector coupled to the shaft, each having a face pointing to the top of the rotor assembly, in a direction substantially parallel to the longitudinal axis, the first and second lofting deflector to create a vortex of air along the longitudinal axis as the shaft rotates, the vortex to move particulate material along the longitudinal axis in the direction of the top of the rotor assembly, wherein the first lofting deflector is angularly offset in a circumferential direction from the second lofting deflector and axially offset along the shaft in a longitudinal direction from the second lofting deflector;
• and
• a first impeller and a second impeller coupled to the shaft, each impeller adjacent to a corresponding one of the first lofting deflector and the second lofting deflector, each extending radially outward from the shaft, each having a face pointing in the direction of rotation of the shaft, each impeller to project the particulate material away from the longitudinal axis;
• and
• an operating chamber proximate the rotor assembly to enclose the rotor assembly in an area in which the vortex is created along the longitudinal axis, the operating chamber having a target area opening through which the projected particulate material is directed toward a target.