Centrifugal projector

Patent metadata

Field	Value
Publication number	US-10071463-B2
Application number	US-201415032876-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Oct 31, 2013
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

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 ( 41 a - 45 e ), 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 ( 3 c ) thereof is positioned to a rear in the rotational direction (R 1 ) compared to a radial inner side ( 3 b ) thereof; the control cage ( 41 - 45 ) has a plurality of opening windows ( 41 a - 45 e ), 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.

First claim

What is claimed is:

1. A centrifugal projector for projecting shot blast materials at a processing target, comprising:
a pair of side plates configured to rotate about a rotation axis in a first direction;
a plurality of cylindrical joining members arranged to secure the pair of side plates in parallel to each other;
a plurality of blades attached to the pair of side plates for rotation along with the pair of side plates;
a stationary control cage disposed in a center portion of the pair of side plates radially inwardly from the plurality of blades, the stationary control cage having an outer peripheral surface formed with an opening therein, wherein the stationary control cage is configured to deliver the shot blast materials out of the opening into between the plurality of blades;
a distributor disposed inside of the control cage for rotation with the pair of side plates, the distributor configured to mix the shot blast materials and supply the mixed shot blast materials to the control cage;
a rotary shaft driven to rotate in the first direction the pair of side plates, the plurality of cylindrical joining members, the plurality of blades and the distributor;
wherein the plurality of blades are each inclined from a line radially extending through the rotational axis and a base end of the blade in a second direction opposite to the first direction so that a radial outer side the blade is positioned further rearward in the second direction than a radial inner side of the same blade,
each blade has a front surface facing in the first direction and used to throw the shot blast materials at the processing target and a back surface facing the second direction, the back surface being formed with (i) a raised portion projecting in the second direction and (ii) a curved surface forming a slope on a radially outer side of the raised portion, a respective cylindrical joining member being in abutment with the curved surface formed in the back surface of the blade, wherein a respective cylindrical joining member is positioned relative to the blade, with which the cylindrical joining member is in abutment, so that an imaginary plane running, in parallel to the rotational axis, through the base end of the blade and a tip of the raised portion goes through inside of the cylindrical joining member between a center axis of the cylindrical joining member and a circumferential surface of the cylindrical joining member opposite to a circumferential surface of the cylinder joining member being in abutment with the curved surface formed in the back surface of the blade, and
the outer peripheral surface of the stationary control cage is formed with one or more square or triangular windows, or formed with a single opening window formed from two or more square or triangular openings at least partially overlapped with each other.

2. The centrifugal projector according to claim 1 , wherein the opening window formed in the outer peripheral surface of the control cage is selected from among rectangular or parallelogram quadrilateral opening windows.

3. The centrifugal projector according to claim 2 , wherein
the front surface of each blade is bifurcated along a radial direction into a first front surface and a second front surface located radially outward of the first front surface, and the first front surface is further bifurcated along the radial direction into a first sub-front surface and a second sub-front surface located radially outward of the first sub-front surface, and
the first and second sub-front surfaces are formed inclined so that the second sub-front surface is located further in the direction opposite to the rotational direction than the first sub-front surface, and the first and second front surfaces are formed inclined so that the second front surface is located further in the rotational direction than an imaginary line running in the radial direction in tangent with the first front surface.

4. The centrifugal projector according to claim 3 , wherein each blade is formed with a pair of planar side walls having front edges and rear edges and extending perpendicularly to the rotational axis through a radial length of the blade along circumferential sides of the front surface, the front edges being shaped straight throughout its radial length and projecting generally in the first direction from the circumferential sides of the front surface, the rear edges being shaped straight in parallel to the front edges except radially inner end portions thereof from which locking portions project in the second direction.

5. The centrifugal projector according to claim 4 , wherein the second front surface of the blade is formed so that an imaginary line (L 2 ) connecting the rotation axis and a radially outer end of the second front surface runs in tangent with the second front surface.

6. The centrifugal projector according to claim 5 , wherein each blade projection portion of the blade has a base portion near a radially inner end of the blade projection portion, wherein the base portion tapers so that a thickness of the base portion measured in the first direction becomes narrower towards the radially inner end of the blade projection portion, and each base portion serves as a guide portion to direct the shot blast materials into between two adjacent blades.

7. The centrifugal projector according to claim 4 , wherein the rear edges being shaped straight in parallel to the front edges except s thereof from which locking portions project in the second direction the locking portions are each formed by a projection standing in the second direction from the radially inner end portion of the rear edge.

8. The centrifugal projector according to claim 1 , wherein the control case has an insertion opening portion configured to receive the distributor therethrough from a side opposite to the rotary shaft, and the control cage has a cover disposed to cover a radial outer part of the distributor on a side of the rotary shaft; and
the centrifugal projector further comprises a hopper positioned on the side opposite to the rotary shaft of the control cage, the hopper configured to supply the shot blast materials to the distributor, and the central projector further comprises a bracket fixed between the hopper and the control cage, the bracket filling a gap between the hopper and the control cage and preventing the shot blast materials from releasing outside from the gap.

9. The centrifugal projector according to claim 3 , wherein the control cage is formed with two separate rectangular opening windows, or a single opening window formed by two rectangular opening windows partially overlapped with each other, and the two separate rectangular opening windows are positioned side-by-side in an axial direction of the control cage and staggered in a circumferential direction of the control cage.

10. The centrifugal projector according to claim 3 , wherein the control cage is formed with a single opening window formed by three rectangular opening windows partially overlapped with each other, and
the single opening window has a first rectangular part, a second rectangular part, and a parallelogram part disposed between the first rectangular part and the second rectangular part, the first rectangular part, the second rectangular part and the parallelogram part being diagonally aligned in the outer peripheral surface of the control cage in an axial direction of the control cage.

11. The centrifugal projector according to claim 3 , wherein the control cage is formed with a single opening window formed by four or more rectangular opening windows partially overlapped with each other,
the single opening window has a first rectangular part, a second

Assignees

• Sintokogio Ltd

Inventors

• Suzuki Hiroaki
• UMEOKA Masato

Classifications

• B24C5/06 Primary

  Impeller wheels; Rotor blades therefor · CPC title

• B24C5/066

  Housings; Accessories therefor, e.g. liners · CPC title

• B24C5/068

  Transferring the abrasive particles from the feeding means onto the propeller blades, e.g. using central impellers · CPC title

• B24C5/062 Primary

  Rotor blades or vanes; Locking means therefor · CPC title

• B24C5/064

  One-piece wheels; Integral impeller units, e.g. made by casting · CPC title