JP4321655B2 - Control cage, centrifugal projection device, and abrasive grain centrifugal projection device - Google Patents

Description

  The present invention relates to a control cage, a centrifugal projection device using the control cage, and an abrasive centrifugal projection device. More specifically, the projection distribution is concentrated in the centrifugal projection apparatus and abrasive centrifugal projection apparatus that project the projection material discharged through the opening window of the control cage onto the workpiece by rotating the impeller provided with a plurality of blades at high speed. The present invention relates to a control cage that can be used, a centrifugal projection device using the control cage, and an abrasive centrifugal projection device.

  Conventionally, a blasting process for peeling and removing rust, burrs, scales, paints, or the like on the surface of an object to be processed has been performed by projecting a projection material such as a fine hard sphere toward the object to be processed. In this blasting process, a centrifugal projection device is used in which an impeller provided with a plurality of blades is rotated at a high speed so that the blades continuously project the projection material by centrifugal force. In this centrifugal projection device, after the projection material supplied from the introduction cylinder is stirred by a rotating distributor, the projection material is discharged from the opening window of the cylindrical control cage, and then the projection material is ejected from the outer peripheral edge of the blade. Projected to processed products.

  The opening window is a cylindrical part of a control cage as disclosed in, for example, Japanese Patent Publication No. 50-32142 and Japanese Patent Application Laid-Open No. 9-174437 in order to control the discharge angle and the scattering angle of the projected projection material. Are formed in a triangular or quadrangular shape. In addition, these triangular and quadrangular shapes have an inverted C shape (V-shaped shape) in the cross section of the control cage. In general, the rectangular opening window concentrates the projection material. It is known that a triangular opening window projects a projection material uniformly over a wide area.

  In general, however, the rectangular opening window projects the projection material in a concentrated manner. For example, when processing a small workpiece, all projection materials are not used effectively, and the projection material is projected to places other than the workpiece. Therefore, there are many useless projections. In addition, because the projection material projected to places other than the article to be processed causes much wear on the liner of the housing (case), an excessive liner configuration (for example, increasing the thickness of the liner, As a material, it is necessary to use an expensive wear-resistant steel from a generally used rolled steel for structural use), and there is a problem that costs increase. Further, since the lining liner is worn quickly, there are problems that the number of times of maintenance such as part replacement increases and the cost of part replacement increases.

  In order to concentrate the projection, it is conceivable to reduce the opening area of the rectangular opening window of the control cage. However, when the projection material is discharged from the opening window even if it is narrowed, the downstream side of the opening window ( There is a problem that the projection range (projection distribution) spreads by conversely spreading by contacting the surface on the downstream side with respect to the rotation direction of the impeller.

  In the conventional abrasive centrifugal projection apparatus, as shown in FIG. 3 of Japanese Patent Publication No. 50-32142 and FIG. 1 of Japanese Patent Laid-Open No. 9-150369, the abrasive discharge port provided in the body portion of the control cage is The inner wall surfaces on the upstream side and the downstream side as viewed from the rotational direction of the distributor are located on the surface extending radially outward from the axial center of the control cage, and traditionally have a divergent shape.

  However, the abrasive discharge port in the conventional abrasive centrifugal projection device configured in this way has a projection area formed by fan-shaped abrasive grains that is unnecessarily wide. Depending on the type of product to be processed, many of the projected abrasive grains that do not hit the product to be processed are generated and the projection efficiency of the abrasive grains is deteriorated.

  In view of the above circumstances, an object of the present invention is to provide a control cage capable of concentrating projection distribution and a centrifugal projection device using the control cage.

  Another object of the present invention is to provide an abrasive centrifugal projection device capable of narrowing a projection area formed by abrasive grains projected in a fan shape.

  The control cage according to claim 1 of the present application is configured to rotate the impeller provided with a plurality of blades at a high speed, and to discharge the projection material discharged through the opening window of the cylindrical control cage disposed in the inner space of the impeller. A control cage used in a centrifugal projection device that projects onto an object to be processed by the blade, wherein an opening window of the control cage is formed in a cylindrical portion of the control cage in parallel with an axis and the rotation of the impeller Presents a quadrilateral shape having an upstream upstream surface and a downstream downstream surface with respect to the direction, and the upstream surface, when measured in the direction opposite to the rotation direction of the impeller, An angle formed between the shaft core and a plane including the inner edge of the upstream surface includes a plane including the shaft core and a plane including the shaft core and the outer edge of the upstream surface; Characterized in that it is larger than the angle.

  By setting it as this structure, since an upstream surface is orient | assigned to the to-be-processed goods side in general, the flow of the projection material discharged | emitted from the opening window of a control cage can be turned to the to-be-processed goods side. Therefore, it is possible to concentrate the projection distribution on the predetermined processed product portion. For this reason, while being able to process a small to-be-processed product without wasting a projection material, the frequency | count of maintenance of a lining liner and part cost can be reduced. Moreover, since the projection density to the part which needs a blast process increases, processing time can be shortened.

  Here, the upstream surface and the downstream surface are preferably parallel to each other.

  In the cross section of the control cage, it is preferable that the upstream surface is formed on a tangent to an inner circumference of the control cage.

  Furthermore, when measured in a direction opposite to the rotation direction of the impeller, an angle formed by a plane including the shaft core and a plane including the shaft core and the inner edge of the downstream surface includes the shaft core. It is preferable that the angle is set larger than an angle formed by a plane and a plane including the shaft core and the outer edge of the downstream surface.

  Further, when measured in a direction opposite to the rotation direction of the impeller, an angle formed by a plane including the shaft core and a plane including the shaft core and the inner edge of the downstream surface includes the shaft core. An angle formed by a plane and a plane including the shaft core and the outer edge of the downstream surface, and the plane including the shaft core and the outer edge of the shaft and the upstream surface It is preferable that a difference between an angle formed with a plane including the plane and a plane including the axis and a plane including the inner edge of the downstream surface is set to 0 to 35 °. .

  Further, the centrifugal projection device of the present invention includes a housing, drive means attached to the outside of one side of the housing, an impeller having a plurality of blades attached to the drive shaft side of the drive means, A distributor mounted coaxially with the drive shaft in the inner circumferential space of the impeller and having openings at substantially equal intervals in the circumferential direction, and a rear end portion attached to a blowing port formed on the other side of the housing. Item 14. A control cage according to Item 1, and an introduction cylinder attached to the housing for supplying a projection material to the blowing port.

  In the present invention, the plane including the axis is a plane including the axis and not located in the opening surrounded by the upstream surface and the upstream surface.

  Further, the impeller includes a side plate on the drive shaft side of the drive means, and a side plate on the introduction cylinder side having an opening larger than the outer periphery of the control cage at a central portion at a position spaced apart from the introduction cylinder side by the side plate. Preferably, the blade includes a plurality of blades that are radially attached and fixed between the side plate on the introduction cylinder side and the side plate on the drive shaft side.

  An abrasive centrifugal projection device according to an eighth aspect of the present invention includes an impeller that is rotatably provided and has a columnar space at the center thereof, and is fixedly disposed in the columnar space of the impeller to form a substantially cylindrical shape and to the body portion. An abrasive centrifugal projection device comprising: a control cage having an abrasive discharge port; and a distributor disposed rotatably in the space of the control cage together with the impeller, wherein the abrasive discharge of the control cage The outlet is formed in a substantially long hole shape extending in a direction parallel to the axial center line of the control cage with a predetermined width in the body portion of the control cage, and an upstream surface upstream of the rotation direction of the distributor The upstream surface is perpendicular to the axial center line and passes through the inner edge of the upstream surface at an angle of 30 to 90 degrees with respect to the center line. Characterized by tilting the rotational direction side of Yuta.

  By adopting such a configuration, when the abrasive grains that have been stirred up by the distributor are supplied to the abrasive outlet, the supplied abrasive grains are located on the rear side (upstream side) as viewed from the rotational direction of the distributor. The inner wall surface (upstream surface) of the abrasive grain discharge port is discharged from the abrasive grain discharge port and moves onto the impeller blade while being prevented from jumping out from the abrasive grain discharge port in the radial direction of the control cage. As a result, the abrasive grains are discharged onto the blades of the impeller while being prevented from being scattered from the abrasive grain discharge ports, so that the projection area of the abrasive grains projected in a fan shape by the impeller is narrower than the conventional one.

  The abrasive centrifugal projection device according to claim 9 is an impeller that is rotatably provided and has a columnar space in the center thereof, and is fixedly disposed in the columnar space of the impeller to form a substantially cylindrical shape, and torso An abrasive centrifugal projection device comprising: a control cage having an abrasive outlet in a portion; and a distributor rotatably disposed in the space of the control cage together with the impeller. The grain discharge port is formed in a substantially long hole shape extending in a direction parallel to the axial center line of the control cage at a predetermined width in the body portion of the control cage, and upstream of the upstream direction with respect to the rotation direction of the distributor. And a downstream downstream surface, wherein the upstream surface extends substantially tangentially to the circular inner wall of the control cage.

  By adopting such a configuration, the abrasive particles swirled while being stirred by the distributor are caused by the inner wall surface (upstream surface) of the abrasive discharge port that extends in the rotation direction of the distributor and substantially tangentially to the circular inner wall of the control cage. In addition to being smoothly pushed into the abrasive discharge port, the pushed-in abrasive particles are converged by the abrasive discharge port, and accordingly, discharged from the abrasive discharge port in a high density state and moved onto the blade of the impeller. As a result, the projection area of the abrasive grains projected in a fan shape by the impeller becomes narrower than the conventional one.

  Here, it is preferable that the upstream surface is inclined to the rotational direction side of the distributor at an angle of 30 to 90 degrees with respect to a center line orthogonal to the axial center line and passing through the inner edge of the upstream surface. If it is less than this, it is not possible to sufficiently prevent the abrasive grains from jumping out from the abrasive outlet in the radial direction of the control cage.

  The downstream surface is preferably inclined to the rotational direction side of the distributor at an angle of 30 to 90 degrees with respect to a center line orthogonal to the axial center line and passing through the inner edge of the downstream surface, and less than 30 degrees. Then, when the abrasive grains come out from the abrasive grain discharge port, they hit the inner wall surface on the front side and diffuse.

  Furthermore, if the downstream surface is made substantially parallel to the upstream surface, the abrasive grain projection area can be narrowed by restricting the direction in which the abrasive grains flow.

  Further, the predetermined width at the abrasive grain discharge port is perpendicular to the axial center line of the control cage and connects to the outer edge of the upstream surface, and perpendicular to the axial center of the control cage and to the inner edge of the downstream surface. It is desirable that the angle formed by the line connecting the parts is determined to be 0 to 35 degrees. When the angle is less than 0 degrees, the front side (downstream side) and the rear side (upstream side) of the abrasive grain discharge port The wall obstructs the discharge of the abrasive grains from the abrasive outlet, and the abrasive grains close the abrasive outlet, or reduces the maximum projection amount of the abrasive grains. The area of the opening of the grain discharge port is widened, and the abrasive grain projected from the abrasive grain discharge port is excessively diffused and the projection area of the projected abrasive grain is widened.

  The long hole in the abrasive discharge port includes a rectangular opening.

Embodiment 1
Hereinafter, a control cage of the present invention and a centrifugal projection apparatus using the control cage will be described with reference to the accompanying drawings. As shown in FIG. 1, a centrifugal projection apparatus according to an embodiment to which a control cage of the present invention is applied is a housing (impeller case) disposed on an upper wall 1 disposed on a ceiling of a polishing chamber of the apparatus body. ) 2, drive means 3 disposed on the upper wall 1 that is outside the side portion 2 a of the housing 2, an impeller 4 attached to the drive shaft 3 a side of the drive means 3, A distributor 5 attached coaxially to the drive shaft 3a in the circumferential space S, a cylindrical control cage 6 attached to a side 2b opposite to the side 2a of the housing 2, and attached to a side 2b of the housing 2 The introduction cylinder 7 is provided.

  The drive means 3 is not particularly limited, and a drive motor provided with a bearing (not shown) that rotatably supports the drive shaft 3a can be used. Alternatively, when the drive shaft 3a is rotatably supported by a bearing of a bearing unit, the drive means 3 includes the bearing unit, a pulley connected to the end of the drive shaft 3a, a drive motor, The pulley may be connected to the rotation shaft of the drive motor, and the belt may be wound around the pulley of the drive shaft 3a and the pulley of the drive motor.

  In the present embodiment, the impeller 4 is attached to the drive shaft 3a by a bolt 11 via a hub 10, and a side plate 12a on the drive shaft 3a side of the drive means 3 and the introduction cylinder by the side plate 12a. 7 and a plurality of, for example, 4 to 12 blades 13 that are radially attached and fixed between the side plate 12a and the side plate 12b. The side plate 12b has an opening larger than the outer periphery of the control cage 6 at the center, and the side plate 12b and the blade 13 are assembled so that the inner peripheral end of the side plate 12b and the inner peripheral end of the blade 13 are substantially the same. It is done to be. Although the side plate 12a of the impeller 4 in the present embodiment is manufactured separately from the hub 10, the present invention is not limited to this, and the side plate 12a and the hub 10 are manufactured integrally. be able to.

  The distributor 5 is a component for agitating the projection material, and is fixed to the side plate 12a by bolts 14, and has the same number of blades 13 as the number of blades 13, a number smaller than the number, or a larger number of openings ( Cutouts 15 are provided at substantially equal intervals in the circumferential direction. That is, the distributor 5 in the present embodiment is a so-called comb in which the same number of claws 16 as the number of the blades 13 protrude from the base portion 5a in parallel to the central axis of the impeller 4 (left and right direction in FIG. 1). Although it has a tooth shape, the present invention is not limited to this, and the tip end of the claw 16 may be connected and reinforced in the circumferential direction.

  As shown in FIGS. 1 and 2, the control cage 6 has an opening window formed in the cylindrical portion of the tip portion 6a in the direction of the axis C (the left-right direction in FIG. 1 and the vertical direction in FIG. 2). 17 is a part that regulates the projection direction by 17, extends between the distributor 5 and the blade 13, and a rear end 6 b is formed on the side 2 b facing the side 2 a of the housing 2. It is attached to the periphery of the blow inlet 18. That is, in this embodiment, as a mounting structure of the control cage 6, first, a link-like flange (annular ring) 19 is assembled to the blowing port 18 and fixed to the side portion 2 b with the bolt 20. A step 6c formed at the rear end 6b of the control cage 6 inserted along the inner circumference of the control cage 6 is sandwiched between the end face of the flange 19 and the end face of the introduction cylinder 7, and finally is pushed in by the introduction cylinder holding member 21 to be bolt 22 It is structured to be attached by.

  The opening window 17 has a rectangular shape having an upstream upstream surface 31 and a downstream downstream surface 32 with respect to the rotation direction A of the impeller 4. Further, the plane C1 includes the shaft core C and is not located in the opening surrounded by the upstream surface 31 and the downstream surface 32, and the shaft core C is disposed in a direction opposite to the rotation direction A of the impeller 4. An angle θ1a from the plane C1 including the plane C1 to the inner edge 31a of the upstream surface 31 is set larger than an angle θ1b from the plane C1 including the axis C to the outer edge 31b of the upstream plane 31. An angle θ2a from the plane C1 including the axis C to the inner edge 32a of the downstream surface 32 is larger than an angle θ2b from the plane C1 including the axis C to the outer edge 32b of the downstream surface 32. Is set. That is, the upstream surface 31 is inclined in the rotation direction A side of the impeller 4 with respect to the line connecting the inner edge 31 a and the shaft core C in the upstream surface 31 in the cross section of the control cage 6. Further, the downstream surface 32 is also inclined toward the rotational direction A side from the line connecting the inner edge portion 32a and the shaft core C on the downstream surface 32. The angular relationship on the upstream surface 31 and the angular relationship on the downstream side 32 can be selected as appropriate depending on, for example, the average particle diameter of the projection material, the projection range on the workpiece, the projection amount, the projection speed, and the like. Accordingly, the upstream surface 31 is substantially directed toward the workpiece, and the flow of the projection material by the downstream surface 32 is less likely to be disturbed, so that the projection material discharged from the opening window of the control cage is guided. Thus, the flow of the projection material can be directed to the workpiece. Therefore, it is possible to concentrate the projection distribution on the predetermined processed product portion. For this reason, a small to-be-processed product can be processed without wasting a projection material. In addition, the number of maintenance and parts costs of the liner liner can be reduced. Furthermore, since the projection density to the portion requiring blasting increases, the processing time can be shortened.

  As described above, if the upstream surface 41 is inclined in the rotation direction A due to the angular relationship (θ1a> θ1b) in the upstream surface 31, the downstream surface 32 is moved from the plane C1 including the axis C to the downstream surface. The angle θ2a from the plane C1 including the axis C to the outer edge 32b of the downstream surface 32 can be set equal to the angle θ2a from 32 to the inner edge 32a. Even in this case, the flow of the projection material by the downstream surface 32 is hardly hindered.

  Moreover, in this invention, when the said upstream surface 31 and the downstream surface 32 are parallel, a projection material contacts the downstream surface 32 of the rotation direction A side, and a projection material will spread | diffuse and a projection range will spread. Therefore, the upstream surface 31 and the downstream surface 32 are preferably parallel to each other as the opening window 17. Of the parallel upstream and downstream surfaces, as shown in FIG. 3 in particular, the plane is formed on the downstream surface 42 parallel to the plane C1 and the inner circumference (inner circumference) 46a of the control cage 46. An opening window 47 in which a tangent line L parallel to C1 is drawn, a contact point of the tangent line L is an inner edge 42a, and an upstream surface 41 is formed on the tangent line L is preferable.

  Further, a difference Δθ between an angle θ1b from the plane C1 including the axis C to the outer edge 41b on the upstream surface 41 and an angle θ2a from the plane C1 including the axis C to the inner edge 42a on the downstream surface 42 is provided. (= Θ1b−θ2a) is preferably set to 0 to 35 °. This is because, when the difference Δθ is less than 0, the opening of the opening window is too narrow and the projection material is likely to be clogged, and as a result, the maximum amount that can be projected decreases, and the difference Δθ is If the angle exceeds 35 °, the opening of the opening window becomes too wide, and the projection distribution (projection range) is likely to be widened.

  The introduction cylinder 7 is a cylinder that supplies the projection material to the impeller 4, and is attached to the side portion 2 b of the housing 2 so as to supply the projection material to the blowing port 18.

  In the present embodiment, the projection material is supplied from the introduction tube 7, passes through the control cage 6, and is agitated by the rotating distributor 5. The projection material stirred in the control cage 6 is discharged from the opening window 17 of the control cage 6 and supplied to the inner peripheral side of the rotating blade 13. Then, the supplied projection material is gradually accelerated by the rotating blade 13 and jumps out from the outer peripheral end of the blade 13 to peel and remove rust, burrs, scales, paint, etc. on the surface of the workpiece. Further, in the opening window 17 in the present embodiment, since the angle θ1a is set to be larger than the angle θ1b as described above, the projection distribution is concentrated, so that a wasteful projection amount is reduced and an excessive liner configuration is unnecessary. As a result, the early wear of the liner can be reduced. Further, since the projection density increases, the processing time can be shortened.

  Next, examples of the present invention will be described, but the present invention is not limited to such examples.

Example In this example, as shown in FIG. 3, the upstream surface 41 and the downstream surface 42 are parallel opening windows from the plane C <b> 1 including the axis C to the outer edge 41 b on the upstream surface 41. Centrifugation using a control cage in which the difference Δθ (= θ1b−θ2a) between the angle θ1b and the angle C2a from the plane C1 including the axis C to the inner edge 42a on the downstream surface 42 is 0 (zero). A projection device was prepared. And the projection test by SB10 (Shinto Brater Co., Ltd. projection material) whose average particle diameter is 1 mm was done, and projection distribution was investigated (Example). The result is shown in FIG. In addition, two types of control cages are formed such that the opening angle θ of the inverted square-shaped (V-shaped) opening window 107 having a conventional rectangular shape shown in FIG. 5 is 40 ° and a narrower angle 15 °. The same test as the projection test of the above example was performed (Comparative Examples 1 and 2). In Comparative Examples 1 and 2, the opening position of the opening window with respect to the impeller was attached at substantially the same position as in this example. The results are also shown in FIG.

  In FIG. 4, first, when the opening angle is 40 ° as shown in Comparative Example 1, the projection distribution is a gentle mountain shape, and even when the opening angle is narrowed to 15 ° as shown in Comparative Example 2. When the projection material is released from the opening window, it can be seen that the projection material diffuses around the edge of the opening and conversely spreads the projection distribution. On the other hand, in the present Example, it turned out that projection distribution can be concentrated.

  Further, from the result of the projection distribution shown in FIG. 4, assuming that the angle range satisfying the amount of 50% of the peak value of the projection ratio is the half width of the projection dispersion, the half width of the projection dispersion in the comparative example 1 is 49.9. The half-value width of projection dispersion in Comparative Example 2 is 86.6 °, whereas the half-value width of projection dispersion in this example is 34.4 °. When compared with Example 1 and Comparative Example 2, it was found that the dispersion angles were concentrated at 31% and 60%.

Embodiment 2
Next, an embodiment of an abrasive grain centrifugal projection apparatus to which the present invention is applied will be described in detail with reference to FIGS. As shown in FIG. 8, the abrasive grain centrifugal projection device is provided rotatably, an impeller 53 having a plurality of blades 51 attached radially and having a cylindrical space 52 in the center, and a cylindrical shape of the impeller 53. A control cage 55 which is separately fixed and disposed in the space 52 and has a substantially cylindrical shape and has an abrasive outlet 54 in the body, and is rotatably disposed in the space of the control cage 55 together with the impeller 53. And a distributor 56.

  As shown in FIG. 6, the abrasive discharge port 54 of the control cage 55 has an inner wall surface (upstream surface) 58 on the rear side (upstream side) 58 when viewed from the rotation direction (arrow 57 direction) of the distributor 56. The control cage 55 is inclined in the direction of the arrow 57 at an angle of 70 degrees with respect to a center line 60 that is orthogonal to the axial center line 59 of the control cage 55 and passes through the inner end (inner edge) of the inner wall surface (upstream surface) 58. And, as shown in FIG. 7, it has a substantially long hole shape extending in a direction parallel to the axial center line 59 with a width of a predetermined dimension.

  Further, the inner wall surface 61 on the front side as viewed from the direction of the arrow 57 in the abrasive grain discharge port 54 is substantially parallel to the inner wall surface (upstream surface) 58 of the abrasive grain discharge port 54.

  In such a configuration, when the abrasive grains are supplied into the distributor 56 under the state where the impeller 53 and the distributor 56 are rotated in the direction of the arrow 57, the abrasive grains stirred up by the distributor 56 are ground. While being supplied to the grain discharge port 54, the supplied abrasive grains are prevented from jumping out from the abrasive grain discharge port 54 in the radial direction of the control cage 55 by the inner wall surface (upstream surface) 58 of the abrasive grain discharge port 54. It is discharged from the abrasive discharge port 54 and moves onto the blade 51 of the impeller 53. As a result, the abrasive grains are discharged onto the blade 51 of the impeller 53 while being prevented from being scattered from the abrasive outlet 54, so that the projection area of the abrasive grains projected in a fan shape by the impeller 53 is larger than the conventional one. Narrow.

  In the above-described embodiment, the inner wall surface (upstream surface) 58 of the abrasive grain discharge port 54 is orthogonal to the axial center line 59 and the inner end portion (inner edge) of the inner wall surface (upstream surface) 58. It is inclined in the direction of arrow 57 at an angle of 70 degrees with respect to the passing center line 60. However, this shape is not limited to this. As shown in FIG. 9, an inner wall surface (upstream surface) 78 on the rear side when viewed from the direction of the arrow 57 in the abrasive grain discharge port 74 of the control cage 75 is a circular inner wall of the control cage 75 in the direction of the arrow 57. Further, the abrasive grain discharge port 74 of the control cage 75 may have a substantially long hole shape extending in the direction of the axial center line 79 of the control cage 75 with a predetermined width.

  Further, the inner wall surface (upstream surface) 78 of the abrasive grain discharge port 74 is substantially parallel to the front inner wall surface (downstream surface) 81 when viewed from the direction of the arrow 57 in the abrasive grain discharge port 74. . Further, as shown in FIG. 9, the width of the predetermined dimension at the abrasive grain discharge port 74 is similar to the above-described embodiment, and the axial center O of the control cage 75 and the inner wall surface at the abrasive grain discharge port 74 ( A line 91 connecting the outer tip (outer edge) A of the upstream surface 78 and an inner tip (inner edge) B of the inner wall surface (downstream surface) 81 at the axis O and the abrasive outlet 74. The angle formed by the line 92 connecting the two is determined at 0 to 35 degrees.

  In such a configuration, when the abrasive grains are supplied into the distributor 56 under a state where the impeller 53 and the distributor 56 are rotated in the direction of the arrow 57, the abrasive grains stirred up by the distributor 56 are The inner wall surface (upstream surface) 78 of the abrasive grain discharge port 74 is smoothly pushed into the abrasive grain discharge port 74, and the pushed abrasive grains are converged by the abrasive grain discharge port 74, and accordingly, the abrasive grain discharge port 74. Is discharged in a high density state and moves onto the blade 51 of the impeller 53. As a result, the projection area of the abrasive grains projected in a fan shape by the impeller 53 becomes narrower than the conventional one.

  In addition, about the projection area | region which the abrasive grain projected in the fan shape forms, the graph compared with the abrasive grain outlet 54 * 74 of the control cage 55 * 75 of this invention, and the abrasive outlet of other various control cages Is shown in FIG.

  From FIG. 10, it can be seen that the projection area of the abrasive grains by the abrasive outlets 54 and 74 of the control cage 55 and 75 of the present invention is shorter than that by the abrasive outlet of other control cages.

FIG. 1 is a sectional view of an essential part of a centrifugal projection apparatus according to an embodiment to which a control cage of the present invention is applied. FIG. 2 is a cross-sectional view of the control cage of FIG. FIG. 3 is a cross-sectional view of another control cage. FIG. 4 is a diagram showing the projection distribution of the example and comparative examples 1 and 2. FIG. 5 is a cross-sectional view of a conventional control cage. FIG. 6 is a schematic cross-sectional view of a control cage according to an embodiment of the present invention. FIG. 7 is an external front view of FIG. FIG. 8 is a partially cutaway longitudinal sectional view of an abrasive centrifugal projection device to which the inventions of claims 8 and 9 are applied. FIG. 9 is a schematic cross-sectional view of a control cage according to an embodiment of the invention of claim 9. FIG. 10 is a graph comparing the abrasive discharge port of the control cage of the invention of claim 9 with the abrasive discharge port of another control cage in the projection area formed by the abrasive particles projected in a fan shape.

Claims (4)

A centrifugal projection device that rotates an impeller provided with a plurality of blades at a high speed, and projects the projection material discharged through an opening window of a cylindrical control cage disposed in the inner space of the impeller onto a workpiece by the blade. A control cage used,
The opening window of the control cage is formed in the cylindrical portion of the control cage in parallel with the axis, and has a quadrangular shape having an upstream surface upstream and a downstream surface downstream with respect to the rotation direction of the impeller. And
When the upstream surface is measured in a direction opposite to the rotation direction of the impeller, an angle formed between a plane including the shaft core and a plane including the shaft core and the inner edge of the upstream surface is the axis. It is set larger than the angle formed by the plane including the core and the plane including the axial core and the outer edge of the upstream surface,
In the cross section of the control cage, the upstream surface is formed on a tangent to an inner circumference of the control cage.   When the upstream surface and the downstream surface are measured in a direction opposite to the rotation direction of the impeller, an angle formed between a plane including the shaft core and a plane including the shaft core and the inner edge of the downstream surface is And an angle formed by a plane including the axis and a plane including the axis and the outer edge of the downstream surface, and the plane including the axis, the axis and the The difference between the angle between the plane including the outer edge of the upstream surface and the angle between the plane including the axial center and the plane including the inner edge of the downstream surface is set to 0 to 35 °. The control cage according to claim 1, wherein the control cage is provided. A housing;
Drive means attached to the outside of one side of the housing;
An impeller having a plurality of blades attached to the drive shaft side of the drive means;
A distributor attached coaxially to the drive shaft in the inner circumferential space of the impeller and having openings at substantially equal intervals in the circumferential direction;
The control cage according to claim 1 or 2 , wherein a rear end portion is attached to a blowing port formed on the other side portion of the housing;
An introduction tube attached to the housing for supplying a projection material to the blowing port;
Centrifugal projection device consisting of The impeller is
A side plate on the drive shaft side of the drive means;
A side plate on the side of the introduction cylinder that is located at a predetermined width away from the side plate on the side of the introduction cylinder, and that has an opening larger than the outer periphery of the control cage at the center;
A plurality of blades radially fixed between the side plate on the introduction cylinder side and the side plate on the drive shaft side;
The centrifugal projection device according to claim 3 , comprising:

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