Centrifugal projector

Patent metadata

Field	Value
Publication number	US-10850367-B2
Application number	US-201815999404-A
Country	US
Kind code	B2
Filing date	Aug 20, 2018
Priority date	Oct 31, 2013
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

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 (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.

First claim

What is claimed is:

1. A centrifugal projector for projection shot blast materials toward a target work, comprising:
a pair of opposing side plates configured to rotate around a rotational axis by a rotary shaft, the pair of side plates having a cylindrical cavity inside thereof around the rotational axis;
a plurality of blades sequentially arranged in a rotational direction and attached between the pair of side plates for ration along with rotation of the pair of side plates;
a control cage placed in the cylindrical cavity in coaxial with the pair of side plates, the control cage being placed stationary with respect to the pair of side plates; and
a distributor placed inside the control cage in coaxial with the control cage for rotation around the rotational axis along with rotation of the pair of side plates, the distributor configured to receive the shot blast materials inside and operable to mix and deliver the received shot blast materials to inside the control cage by means of centrifugal force,
wherein the control cage comprises a cylindrical circumferential surface extending in an axial direction and having a single opening window formed therein, through which the shot blast materials delivered inside the control cage are allowed to flow out from the control cage into between the plurality of blades, wherein the single opening window is integrally formed with at least two rectangular openings at least partially overlapping, respectively extending along a circumference direction of the control cage and wherein a first one of the at least two rectangular openings is positioned offset along both of an axial direction and a circumferential direction of the control cage relative to a second one of the at last two rectangular openings.

2. The centrifugal projector according to claim 1 , wherein each blade is inclined rearward opposite to the rotational direction, and
each blade has a front surface faces forward in the rotation direction and is used to throw the shot blast materials at the target work, the front surface of each blade being bifurcated along a radial direction into a first front surface and a second front surface located radially outward of the first front surface, the first front surface having a radially inner part and a radially outer part that is inclined rearward from the radially inner part, and the second front surface being inclined forward from an imaginary plane running in tangent with the first front surface.

3. The centrifugal projector according to claim 2 , wherein each blade is formed with a pair of planar side walls extending perpendicularly to the rotational axis in parallel to each other along transverse sides of the front surface, each of the pair of planar side walls having a forward and rearward edges, and at least the forward edge being shaped straight throughout its radial length.

4. The centrifugal projector according to claim 3 , wherein the second front surface lies in tangent with an imaginary plane running through the rotational axis.

5. The centrifugal projector according to claim 4 , wherein each blade has a blade projection portion that 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 rotation direction becomes narrower toward 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 of the plurality of blades.

6. The centrifugal projector according to claim 3 , wherein the rear edges of the pair of planar side walls are shaped straight edges except radially inner end portions thereof from which locking portions project rearward.

7. The centrifugal projector according to claim 1 , wherein each of the plurality of blades has a back surface facing rearward opposite to the rotational direction, the back surface being formed with (i) a raised portion projecting rearward and (ii) a curved surface forming a slope on a radially outer side of the raised portion.

8. The centrifugal projector according to claim 1 , wherein the control cage 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. A centrifugal projector for projection shot blast materials toward a target work, comprising:
a pair of opposing side plates configured to rotate around a rotational axis by a rotary shaft, the pair of side plates having a cylindrical cavity inside thereof around the rotational axis;
a plurality of blades sequentially arranged in a rotational direction and attached between the pair of side plates for ration along with rotation of the pair of side plates;
a control cage placed in the cylindrical cavity in coaxial with the pair of side plates, the control cage being placed stationary with respect to the pair of side plates; and
a distributor placed inside the control cage in coaxial with the control cage for rotation around the rotational axis along with rotation of the pair of side plates, the distributor configured to receive the shot blast materials inside and operable to mix and deliver the received shot blast materials to inside the control cage by means of centrifugal force,
wherein the control cage comprises a cylindrical circumferential surface extending in an axial direction and having a single opening window formed therein, through which the shot blast materials delivered inside the control cage are allowed to flow out from the control cage into between the plurality of blades, wherein the single opening window is integrally formed with at least two rectangular openings, respectively extending along a circumference direction of the control cage and wherein a first one of the at least two rectangular openings is positioned offset along both of an axial direction and a circumferential direction of the control cage relative to a second one of the at last two rectangular openings, and
wherein the at least two rectangular openings are spaced apart along the axial direction of the control cage and connected by a third opening having oblique straight lines defining at least two edges of the third opening so as to provide the single opening window.

10. The centrifugal projector according to claim 9 , wherein each blade is inclined rearward opposite to the rotational direction, and
each blade has a front surface faces forward in the rotation direction and is used to throw the shot blast materials at the target work, the front surface of each blade being bifurcated along a radial direction into a first front surface and a second front surface located radially outward of the first front surface, the first front surface having a radially inner part and a radially outer part that is inclined rearward from the radially inner part, and the second front surface being inclined forward from an imaginary plane running in tangent with the first front surface.

11. The centrifugal projector according to claim 10 , wherein each blade is formed with a pair of planar side walls extending perpendicularly to the rotational axis in

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