This disclosure provides a new internal weld blasting system for blasting the internal surfaces of pipes, and the method of use thereof. The system comprises a control cage having two relatively narrow openings. An impeller forces abrasives onto a blast wheel, which in turn sprays the abrasives onto the internal surfaces of the pipes.

A control for a sheet metal processing line with a descaler includes sensors that adjust the spray blast pattern produced by impellers and the sheet advancement rate during descaling. The control may position a nozzle of the impeller so when a surface condition of the edge of the sheet is more favorable than that of the center of the sheet, the impeller spray concentration moves toward the center, and when a surface condition of the center of the sheet is more favorable than that of a respective edge of the sheet, the impeller spray concentration moves away from the center of the sheet. The control may raise the sheet advancement rate when the surface condition of the center of the sheet is more favorable than a standard, and lower the sheet advancement rate when a surface condition of the center of the sheet is less favorable than a standard.

A wheel assembly for a centrifugal blast wheel machine includes a blast wheel and several blades configured to throw blast media introduced into the blast wheel against a work piece. Each blade includes a first side having a first rail portion that extends along a length of the first side and a second side having a second rail portion that extends along a length of the second side. Each rail portion has a locking member positioned on an outside surface of the rail portion adjacent a first end of the blade. Each rail portion further has a contact surface that is configured to engage a surface of a seat of the blast wheel. Each blade further includes a positioning knob located on the first contact surface to prevent the blade from inadvertently being removed from the seat.

The present invention is a centrifugal projector (1) for projecting projection material (2) toward a processing target, comprising a side plate (11), a plurality of blades (3) attached to the side plate, a rotary shaft (14) for rotating the side plate and the blades, and an introducing part (32) for introducing the projection material between the blades; wherein the blades (3) includes a projection surface (3a) for projecting the projection material, and the projection surface (3a) has a first part (3b) being a radial inner part of the blade and a second part (3c) being a radial outer part of the blade; the first part (3b) is formed to be pitched so that a radial outer side (3e) of the first part is positioned to a rear in the rotational direction (R1) compared to a radial inner side (3f) of the first part, and the second part (3c) of the blade is formed to be positioned to a front in the rotational direction (R1) of an imaginary line (L1) which extends the first part (3b) of the blade toward a radial outer side of the projector.

The present invention is a centrifugal projector (1) for projecting projection material (2) toward a processing target, comprising a side plate (11), a plurality of blades (3) attached to the side plate, a rotary shaft (14) for rotating the side plate and the blades, and an introducing part (32) for introducing the projection material between the blades; wherein the blades (3) includes a projection surface (3a) for projecting the projection material, and the projection surface (3a) has a first part (3b) being a radial inner part of the blade and a second part (3c) being a radial outer part of the blade; the first part (3b) is formed to be pitched so that a radial outer side (3e) of the first part is positioned to a rear in the rotational direction (R1) compared to a radial inner side (3f) of the first part, and the second part (3c) of the blade is formed to be positioned to a front in the rotational direction (R1) of an imaginary line (L1) which extends the first part (3b) of the blade toward a radial outer side of the projector.

The centrifugal projector (1) of the present invention has: a side plate (11), a plurality of blades (3) attached to the side plate (11), a control cage (41-45) disposed on a radial inner side of the side plate for releasing the projection material between blades from an opening portion (41a-45e), a distributor (22), disposed on a radial inner side of the control cage, for mixing and supplying the projection material to the control cage, and a rotary shaft (14) for rotating the side plate, blades and distributor; wherein the blades are formed to be pitched so that a radial outer side (3c) thereof is positioned to a rear in the rotational direction (R1) compared to a radial inner side (3b) thereof; the control cage (41-45) has a plurality of opening windows (41a-45e), or a single opening window in which a portion or all of a plurality of opening windows are respectively overlapped and integrated into a single piece.

The centrifugal projector (1) of the present invention has: a side plate (11), a plurality of blades (3) attached to the side plate (11), a control cage (41-45) disposed on a radial inner side of the side plate for releasing the projection material between blades from an opening portion (41a-45e), a distributor (22), disposed on a radial inner side of the control cage, for mixing and supplying the projection material to the control cage, and a rotary shaft (14) for rotating the side plate, blades and distributor; wherein the blades are formed to be pitched so that a radial outer side (3c) thereof is positioned to a rear in the rotational direction (R1) compared to a radial inner side (3b) thereof; the control cage (41-45) has a plurality of opening windows (41a-45e), or a single opening window in which a portion or all of a plurality of opening windows are respectively overlapped and integrated into a single piece.

An impeller for a centrifugal blast wheel machine includes a hub provided at one end of the impeller, with the hub being configured to be coupled to the motor. The hub further includes a ring provided at an opposite end of the hub, with the ring defining a media inlet to receive blast media. The impeller further includes a plurality of cylindrical vanes positioned between the hub and the ring. The plurality of cylindrical vanes is spaced from one another on peripheries of the hub and the ring. The plurality of cylindrical vanes defines a plurality of impeller media outlets constructed and arranged to allow egress of blast media upon rotation of the impeller.

The present invention is a side plate unit (10) used in a centrifugal projector (1) which projects projection material (2) toward a processing target by rotating a plurality of blades (3), and the side plate unit (10) being provided to attach the plurality of blades thereto, the side plate unit (10) comprising: a pair of side plates (11); and a joining member (12) for joining the pairs of side plates; wherein guide channel portions (13) are respectively formed on mutually opposing surfaces of the pair of side plates (11); and the side plate guide channel portions (13) are formed to be pitched so that the radial outer side thereof is positioned to a rear in the rotational direction (R1) compared to the radial inner side thereof.

The present invention is a side plate unit (10) used in a centrifugal projector (1) which projects projection material (2) toward a processing target by rotating a plurality of blades (3), and the side plate unit (10) being provided to attach the plurality of blades thereto, the side plate unit (10) comprising: a pair of side plates (11); and a joining member (12) for joining the pairs of side plates; wherein guide channel portions (13) are respectively formed on mutually opposing surfaces of the pair of side plates (11); and the side plate guide channel portions (13) are formed to be pitched so that the radial outer side thereof is positioned to a rear in the rotational direction (R1) compared to the radial inner side thereof.