Centrifugal projector and blade

Patent metadata

Field	Value
Publication number	US-10105818-B2
Application number	US-201415032495-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Oct 31, 2013
Publication date	Oct 23, 2018
Grant date	Oct 23, 2018

Abstract

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 ( 3 a ) for projecting the projection material, and the projection surface ( 3 a ) has a first part ( 3 b ) being a radial inner part of the blade and a second part ( 3 c ) being a radial outer part of the blade; the first part ( 3 b ) is formed to be pitched so that a radial outer side ( 3 e ) of the first part is positioned to a rear in the rotational direction (R 1 ) compared to a radial inner side ( 3 f ) of the first part, and the second part ( 3 c ) of the blade is formed to be positioned to a front in the rotational direction (R 1 ) of an imaginary line (L 1 ) which extends the first part ( 3 b ) of the blade toward a radial outer side of the projector.

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 around a rotation axis in a first rotation direction;
a plurality of blades attached to the pair of side plates for rotation with the pair of side plates;
a rotary shaft driven to rotate, in the first rotation direction, the pair of side plates and the plurality of blades; and
an introducing part configured to introduce the shot blast materials between two adjacent blades of the plurality of blades;
wherein each blade has a front surface facing in the first rotation direction and being used to throw the shot blast materials at the processing target, 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 being 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, wherein the first and second sub-front surfaces are formed inclined so that the second sub-front surface is located further in a second rotation direction opposite to the first rotation direction than the first sub-front surface and so that the second front surface is located further in the first rotation direction than an imaginary line running in the radial direction in tangent with the first front surface, and
further 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 rotation 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.

2. The centrifugal projector according to claim 1 , 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.

3. The centrifugal projector according to claim 2 , 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 first 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.

4. The centrifugal projector according to claim 1 , wherein the rear edges are each shaped straight in parallel to the front edges except a radially inner end portion thereof, and the locking portions are each formed with a projection standing in the second rotation direction from the radially inner end portion of the rear edge.

5. The centrifugal projector according to claim 1 , wherein each blade has a back surface facing the second rotation direction, the back surface being formed with (i) a raised portion projecting in the second rotation direction and (ii) a curved surface forming a slope on a radially outer side of the raised portion.

6. The centrifugal projector according to claim 4 , further comprising:
a side plate unit to which the plurality of blades are attached, wherein the side plate unit includes the pair of side plates and a joining member configured to connect the pairs of side plates together;
guide channel portions formed in opposing surfaces of the pair of side plates of the side plate unit; and
side plate guide channel portions formed in the opposing surfaces of the pair of side plates, the side plate guide channel portions being inclined so that a radially outer side of each side plate guide channel portion is positioned rearward of a radian inner side thereof in the first rotation direction.

7. The centrifugal projector according to claim 6 , wherein the side plate guide channel portion of the side plate has an outside part formed straight in shape.

8. The centrifugal projector according to claim 7 , wherein the side plate guide channel portion of the side plate has an inside part formed wider in a direction perpendicular to a direction of the side plate guide channel than the outside part the inside part being configured to locked with the locking portion to secure the blade in position.

9. The centrifugal projector according to claim 6 , wherein the joining members of the side plate unit are provided as many as the plurality of blades, and
the joining members is disposed, respectively, between opposing front surface and back surface of two adjacent blades of the plurality of blades at a position closer to the back surface of one of the two adjacent blades than a midpoint position (K 3 ) between the opposing front surface and back surface of the two adjacent blades.

10. The centrifugal projector according to claim 9 , wherein a respective joining member is positioned relative to the blade, with which the 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 thereof goes through inside of the joining member between a center axis of the joining member and a circumferential surface of the joining member opposite to a circumferential surface of the joining member being in abutment with the curved surface formed in the back surface of the blade.

11. The centrifugal projector according to claim 9 , wherein a number of the plurality of blades is six.

12. The centrifugal projector according to claim 6 , wherein the side plate unit is attached to the rotary shaft by a bolt, and the side plate guide channel portions each have a concave portion configured to receive a head of the bolt.

13. The centrifugal projector according to claim 12 , wherein the pair of side plates are formed and positioned in a plane-symmetrical fashion with respect to an imaginary plane (P 3 ) running at a center of the joining members perpendicular to the joining members.

14. The centrifugal projector according to claim 4 , further comprising guide channel portions formed in opposing surfaces of the pair of side plates, wherein the guide channel portion are inclined so that a radial outer side thereof is positioned further in the second rotation direction than a radial inner side thereof.

15. A blade used in a centrifugal projector for projecting shot blast materials at a processing target,
wherein each blade has a front surface facing in the first rotation direction and being used to throw the shot blast materials at the processing target, 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 being 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, wherein the first and second sub-front surfaces are formed inclined so that the second sub-front surface is located further in a second rotation direction opposite to the first rotation direction than the first sub-front surface and so that the second front surface is located fur

Assignees

• Sintokogio Ltd

Inventors

• Suzuki Hiroaki
• UMEOKA Masato

Classifications

• B24C5/06 Primary

  Impeller wheels; Rotor blades therefor · CPC title

• B24C5/062 Primary

  Rotor blades or vanes; Locking means therefor · CPC title

• B24C5/066

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

• B24C7/00

  Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts · CPC title