WO2007072803A1 - Control cage, centrifugal projection device, and abrasive grain centrifugal projection device - Google Patents

Abstract

A centrifugal projection device for rotating at high speed an impeller provided with a plurality of blades and projecting projection elements, discharged through the opening window in a cylindrical control cage disposed in the inner space of the impeller, onto an article to be processed by the blades. The opening window (17) in the control cage (6) is formed in parallel to the axis center in the cylindrical portion of the control cage (6), and provides a rectangular shape having an upstream surface (31) on the upstream side with respect to the rotation direction (A) of the impeller and a downstream surface (32) on the downstream side. The above upstream surface (31) can concentrate a projection distribution by setting, when measured in a direction opposite to the rotation direction of the impeller, an angle (θ1a) formed by a plane including the above axis center and a plane including the axis center and the inner edge (31a) of the upstream surface to be larger than an angle (θ1b) formed by a plane including the above axis center and a plane including the axis center and the outer edge (31b) of the upstream surface.

Description

 Specification

 Control cage, centrifugal projection device, and abrasive grain centrifugal projection device

 Technical field

 The present invention relates to a control cage, a centrifugal projection device using the control cage, and an abrasive centrifugal projection device. More specifically, in a centrifugal projection device and an abrasive centrifugal projection device that rotate the impeller provided with a plurality of blades at high speed and project the projection material discharged through the opening window of the control cage onto the workpiece, the projection distribution The present invention relates to a control cage capable of concentrating the particles, a centrifugal projection device using the control cage, and an abrasive centrifugal projection device.

 Background art

 Conventionally, a blasting process for peeling off and removing wrinkles, burrs, scales, paints, or the like on the surface of the object to be processed by projecting a projection material such as a fine hard sphere toward the object to be processed has been performed. In this blast case, 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, the projection material supplied from the introduction cylinder is agitated by a rotating distributor, then 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. Projecting to the product to be processed.

 [0003] In order to control the emission angle and spray angle of the projected projection material, the opening window is controlled as disclosed in, for example, Japanese Patent Publication No. 50-32142 and Japanese Patent Application Laid-Open No. 9-174437. The cylindrical portion of the cage is formed in a triangular shape or a quadrangular shape. In addition, these triangular and quadrangular shapes have an inverted C shape (V-shaped) in the cross section of the control cage. In general, the rectangular opening window collects the projection material. It is known to project in the middle, and the triangular opening window projects the projection material uniformly and over a wide area.

[0004] However, in general, a rectangular opening window projects a 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 not used. Since it is projected to places other than the processed product, there are many useless projections. In addition, the projection material projected to places other than the treated product causes much wear on the inner liner of the housing (case), so that an excessive liner configuration (for example, an increase in liner thickness or a liner As a material, it is necessary to use an expensive wear-resistant steel from a generally used rolled steel for a general structure), and there is a problem that costs increase. In addition, because the liner liner wears quickly, there are problems that the number of maintenance such as part replacement increases and the cost of part replacement increases.

 [0005] In order to make the projection ^^, it is conceivable that the opening area of the rectangular opening window of the control cage is narrowed. There is a problem if the projection range (projection distribution) spreads out by spreading by contacting the surface on the downstream side of the window (downstream with respect to the impeller rotation direction).

 [0006] In addition, in the conventional barrel centrifuge 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 gun provided in the body portion of the control cage The particle outlets are traditionally divergent, with the upstream and downstream inner wall surfaces located on the surface extending radially outward from the axial center of the control cage as viewed in the rotational force of the distributor. ing.

However, since the projection area formed by the abrasive grains projected in a fan shape is unnecessarily wide at the barrel discharge port in the conventional barrel centrifugal projection apparatus configured as described above, However, depending on the type of product to be processed, there are many projected abrasive grains that do not hit the product to be processed, resulting in a problem that the projection efficiency of the gun barrel is deteriorated. is there.

 Disclosure of the invention

 [0008] 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.

It is another object of the present invention to provide an abrasive centrifugal projection device that can narrow a projection area formed by abrasive grains projected in a fan shape.

[0010] The control cage of the invention according to claim 1 of the present application is an in- strument provided with a plurality of blades. A control cage used in a centrifugal projection device that rotates a propeller at high speed and projects a 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. The opening window of the control cage is formed in the cylindrical portion of the control cage in parallel with the axial center, and the upstream surface on the upstream side and the downstream surface on the downstream side with respect to the rotation direction of the impeller. The upstream surface includes a plane including the shaft core, and the shaft core and an inner edge of the upstream surface when measured in a direction opposite to the rotation direction of the impeller. An angle formed with the plane is set to be larger than an angle formed between the plane including the axis and the plane including the axis and the outer edge of the upstream surface.

 [0011] By adopting a powerful configuration, the upstream surface is generally directed to the product to be processed, so that the flow of the projection material that is also discharged from the opening window force of the control cage can be directed to the product to be processed. Therefore, it is possible to make the projection distribution ^^ in a predetermined part to be processed. For this reason, it is possible to process a small workpiece that does not waste the projection material, and it is possible to reduce the number of maintenance and parts costs of the lining liner. In addition, since the projection density to the places that require blasting increases, the processing time can be shortened.

[0012] Here, the upstream surface and the downstream surface are preferably parallel to each other.

 [0013] Further, in the cross section of the control cage, the upstream surface is preferably formed on a tangent line of an inner circumference of the control cage.

 [0014] 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 is the axis. It is preferable that the angle is set larger than an angle formed between a plane including the core and a plane including the shaft core and the outer edge of the downstream surface.

[0015] Further, when measured in the 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 is the axis. A plane that includes a core and a plane that includes the shaft core and a plane that includes the outer edge of the downstream surface, the plane including the shaft core, the shaft core, and the upstream surface. An angle formed with a plane including the outer edge of the plane, a plane including the axis, and an inner edge of the downstream surface. It is preferable that the difference from the angle formed with the flat surface is set to 0 to 35 °.

[0016] Further, the centrifugal projection device of the present invention includes a housing, drive means attached to the outside of one side of the housing, and a plurality of blades attached to the drive shaft side of the drive means. An impeller having an inner periphery, 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 at a blowing port formed on the other side of the housing The control port cage according to claim 1, wherein a portion is attached, an introduction tube attached to the housing for supplying the projection material to the blowing port, and a force.

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

[0018] Further, the impeller includes a side plate on the drive shaft side of the driving means, and an 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 by the side plate. And a plurality of blades that are radially attached and fixed to the side plate on the introduction cylinder side and the side plate on the drive shaft side.

[0019] An ambulatory centrifugal projection device according to claim 8 is 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 and has a substantially cylindrical shape. An ambulatory centrifugal projection apparatus comprising: a control cage having an ambulatory discharge port in a body portion; and a distributor disposed rotatably in the space of the control cage together with the impeller. The barrel discharge port is formed in a substantially long hole 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 with respect to the rotation direction of the distributor. An upstream surface on the upstream side and a downstream surface on the downstream side, and the upstream surface is 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. It is characterized by inclining toward the rotation direction side of the tributor.

[0020] By adopting a powerful configuration, when the abrasive particles that have been swirled while being stirred by the distributor are supplied to the abrasive outlet, the supplied abrasive grains are rearward as viewed from the rotational direction of the distributor. The inner wall surface (upstream surface) of the (upstream) barrel outlet prevents the barrel outlet force from jumping out in the radial direction of the control cage. And is moved onto the blade of the impeller. As a result, the bullet is discharged onto the blade of the impeller while being prevented from being scattered from the bullet discharge port, so that the projection area of the abrasive particles projected in a fan shape by the impeller is narrower than the conventional one.

 [0021] Further, an ambulatory centrifugal projection device according to claim 9 is 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 a control cage having a barrel discharge port in the body and a distributor arranged rotatably in the space of the control cage together with the impeller. The cage spray outlet of the cage 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 cage, and with respect to the rotation direction of the distributor. And an upstream upstream surface and a downstream downstream surface, wherein the upstream surface extends in a substantially tangential direction of the circular inner wall of the control cage.

 [0022] By virtue of the powerful configuration, the barrels that are whisked while being stirred by the distributor are located within the barrel outlet that extends in the rotational direction of the distributor and substantially tangentially to the circular inner wall of the control cage. The wall surface (upstream surface) can be smoothly pushed into the barrel discharge port, and the pushed-in barrel can be converged by the barrel discharge port. Move on the blade of the impeller. As a result, the projection area of the barrel projected in the fan shape by the impeller becomes narrower than the conventional one.

 [0023] Here, the upstream 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 upstream surface. If it is less than 30 degrees, it will not be possible to sufficiently prevent the bullet from flying out of the bullet outlet in the radial direction of the control cage.

 [0024] Further, it is desirable that the downstream surface be inclined toward 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. If the angle is less than 30 degrees, it will spread when it hits the inner wall surface on the front side when it exits from the outlet.

[0025] Further, if the downstream surface is substantially parallel to the upstream surface, the direction in which the gunballs flow is limited. This makes it possible to narrow the projection area of the barrel.

 [0026] Further, the predetermined width at the bullet discharge port is perpendicular to the axis center line of the control cage and is connected to the outer edge of the upstream surface and the axis center of the control cage. It is desirable that the angle formed by the line connecting the inner edge of the downstream surface is determined to be 0 to 35 degrees. If the angle is less than 0 degrees, the front side (downstream side) and the rear side of the barrel discharge port (Upstream side) inner wall obstructs the abrasive discharge of the abrasive grains, and the abrasive grains block the abrasive outlet, reduce the maximum projection amount of abrasive grains, When the angle exceeds 35 degrees, the area of the opening of the abrasive grain discharge port is widened, and the projection area of the projected abrasive grain is widened due to excessive diffusion of the bullet discharged from the bullet discharge port.

 [0027] It should be noted that the long hole in the bullet discharge port includes a rectangular opening.

 BEST MODE FOR CARRYING OUT THE INVENTION

 [0028] 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, the centrifugal projection apparatus according to the embodiment to which the control cage of the present invention is applied is a housing (impeller case) disposed on the upper wall 1 arranged on the ceiling of the cleaning chamber of the apparatus body. 2), a driving means 3 disposed on the upper wall 1 outside the side portion 2a of the housing 2, an impeller 4 attached to the driving shaft 3a side of the driving means 3, and an inner side of the impeller 4 Distributor 5 attached coaxially with drive shaft 3a in circumferential space S, cylindrical control cage 6 attached to side 2b opposite to side 2a of housing 2, and side 2b of housing 2 It has an introduction tube 7 attached.

 [0029] The drive means 3 is not particularly limited, but 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, and a drive motor. Also, it can be constituted by a pulley connected to the rotation shaft of the drive motor, and a belt wound around the pulley of the drive shaft 3a and the pulley of the drive motor.

[0030] In the present embodiment, the impeller 4 is connected to the drive shaft 3a by a bolt 11 via a hub 10. The side plate 12a on the drive shaft 3a side of the drive means 3, the side plate 12b positioned at a predetermined width away from the introduction tube 7 by the side plate 12a, and the side plate 12a and the side plate 12b. It is composed of a plurality of, for example, 4 to 12 blades 13 that are radially fixed to each other. 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. Note that the side plate 12a of the impeller 4 in the present embodiment is a force produced separately from the hub 10. In the present invention, the side plate 12a and the hub 10 that are not limited to this are produced integrally. Can do.

 [0031] The distributor 5 is a component for stirring the projection material, and is fixed to the side plate 12a by bolts 14. The number of the blades 13 is the same as the number of blades 13, a number less than the number, or the number. A larger number of openings (notches) 15 are provided at substantially equal intervals in the circumferential direction. That is, in the distributor 5 in the present embodiment, 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). The force presenting a so-called comb-teeth shape In the present invention, the shape of the nail 16 that is not limited to this can be reinforced by connecting it in the circumferential direction.

 [0032] As shown in Figs. 1 and 2, the control cage 6 is formed on 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). A part that regulates the projection direction by an opening window 17 that extends between the distributor 5 and the blade 13, and the rear end 6b faces the side 2a of the housing 2. It is attached around the air inlet 18 formed in the part 2b. That is, in the present 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 2b with the bolt 20, and then the flange 19 The 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 pushed by the introduction cylinder holding member 21. It is structured to be attached with bolts 22.

The opening window 17 has a quadrangular shape having an upstream upstream surface 31 and a downstream downstream surface 32 with respect to the rotational direction A of the impeller 4. Further, the plane C1 includes the shaft core C and is not located in an opening surrounded by the upstream surface 31 and the downstream surface 32, and the impeller The angle Θ la from the plane C1 including the axis C to the inner edge 31a of the upstream plane 31 in the direction opposite to the rotational direction A of 4 is from the plane C1 including the axis C to the upstream plane The angle to the outer edge 31b at 31 is set larger than Θ lb. The angle Θ 2a from the plane C1 including the axis C to the inner edge 32a of the downstream surface 32 is the angle Θ 2b from the plane C1 including the axis C to the outer edge 32b of the downstream surface 32. It is set larger. That is, the upstream surface 31 is inclined in the rotational direction A side of the impeller 4 with respect to the line connecting the inner edge 31a and the shaft core C on the upstream surface 31 in the transverse plane 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 32a and the shaft core C on the downstream surface 32. The angle relationship on the upstream surface 31 and the angle 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, and the projection speed. As a result, the upstream surface 31 is substantially directed toward the workpiece, and the flow of the projection material through the downstream surface 32 is less likely to be obstructed, so that the projection material discharged from the opening window of the control cage can be reduced. The flow of blasting material can be directed to the product to be processed. Therefore, it is possible to make the projection distribution ^^ in a predetermined part to be processed. For this reason, it is possible to process a small product to be processed that does not waste the projection material. In addition, the number of maintenance and parts costs for the liner can be reduced. In addition, the processing density can be shortened by increasing the projection density to the locations that require blasting.

[0034] As described above, if the upstream surface 41 is inclined in the rotational direction A due to the angular relationship (0 la> Θ lb) on the upstream surface 31, the downstream surface 32 is a plane including the axis C. The angle Θ 2a from C1 to the inner edge 32a of the downstream surface 32 can be set equal to the angle Θ 2b from the plane C1 including the axis C to the outer edge 32b of the downstream surface 32. Even in this case, the flow of the projection material by the downstream surface 32 is hardly obstructed.

In the present invention, if the upstream surface 31 and the downstream surface 32 are parallel, the projection material comes into contact with the downstream surface 32 on the rotation direction A side, the projection material diffuses, and the projection range is increased. In order to prevent spreading, it is preferable that the upstream surface 31 and the downstream surface 32 are parallel to each other as the opening window 17. Of the powerful parallel upstream and downstream surfaces, especially in the plane C1, as shown in Fig. 3. A tangent line L parallel to the plane C1 is drawn on the downstream face 42 parallel to the inner circumference (inner circumference face) 46a of the control cage 46, and a contact point of the tangent line L is defined as an inner edge 42a. An opening window 47 in which the upstream surface 41 is formed on the tangent line L is preferable.

Further, an angle Θ lb from the plane C1 including the axis C to the outer edge 41b of the upstream surface 41 and an angle from the plane C1 including the axis C to the inner edge 42a of the downstream surface 42 The difference Δ 0 (= 0 lb− 0 2a) from Θ 2a is preferably set to 0 to 35 °. This is because when the difference ΔΘ force ^ is less than the difference ΔΘ force ^, the opening of the opening window is too narrow and the projection material is easily clogged, and as a result, the maximum projectable amount is reduced. This is because if ΔΘ exceeds 35 °, the aperture of the aperture window becomes too wide and the projection distribution (projection range) is likely to expand.

 The introduction cylinder 7 is a cylinder that supplies a 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 stirred by the rotating distributor 5. The projectile 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 the outer peripheral end force of the blade 13 is also ejected to peel off and remove wrinkles, burrs, scales, paints, and the like on the surface of the workpiece. Further, in the aperture window 17 in the present embodiment, since the angle Θla is set larger than the angle Θlb as described above, the projection distribution is concentrated, so that the amount of unnecessary projection is reduced and the excessive liner is reduced. No configuration is required, and early liner wear can be reduced. Moreover, 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.

[0040] Examples

In the present embodiment, as shown in FIG. 3, the upstream surface 41 and the downstream surface 42 are parallel open windows, and the angle from the plane C1 including the axis C to the outer edge 41b of the upstream surface 41 is 0. lb and angle from the plane C1 including the axis C to the inner edge 42a at the downstream face 42 Difference from Θ 2a Δ We prepared a centrifugal projector using a control cage set so that θ (= θ lb- θ 2a) was 0 (zero). Then, a projection test was conducted using SB10 (projection material manufactured by Shinto Brater Co., Ltd.) having an average particle diameter of 1 mm, and the projection distribution was examined (Example). The results are shown in Fig. 4. In addition, the conventional square-shaped (V-shaped) shape of the conventional square shape shown in Fig. 5 (V-shaped) Opening window 1 07 Open angle Θ force 0 ° and narrower angle 15 ° A test similar to the projection test of the above-described example was performed using a cage (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. 4.

[0041] 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 as shown in Comparative Example 2, the opening angle is 15 °. Even if it is narrowed, it can be seen that when the projection material is released from the aperture window, it diffuses around the edge of the aperture and conversely spreads the projection distribution. On the other hand, it was found that the projection distribution can be concentrated in this embodiment.

 [0042] From the result of the projection distribution shown in Fig. 4, if the angle range satisfying 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 Comparative Example 1 is 49.9 °, and the half width of the projection dispersion in Comparative Example 2 is 86.6 °, whereas the half width of the projection dispersion in this example is 34.4 °. Compared with 1 and Comparative Example 2, the dispersion angles were concentrated at 31% and 60%.

 [0043] 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 barrel centrifuge projection apparatus 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 circle of the impeller 53 A control cage 55 that is separately fixed and arranged in the columnar space 52, has a substantially cylindrical shape, and has a barrel discharge port 54 in the fuselage, and can rotate together with the impeller 53 in the space of the control port cage 55. Distributor 56, which is arranged.

[0044] And, as shown in Fig. 6, the barrel discharge port 54 of the control cage 55 has an inner wall surface (upstream) on the rear side (upstream side) when viewed from the rotation direction (arrow 57 direction) of the distributor 56. Surface) 58 force The inner wall surface (upstream surface) of the bracket that is orthogonal to the axial center line 59 of the control cage 55 The arrow 57 direction side at an angle of 70 degrees with respect to the center line 60 that passes through the inner end (inner edge) of 58 As shown in FIG. 7, it has a substantially elongated hole shape extending in a direction parallel to the axial center line 59 with a predetermined width.

 In addition, the inner wall surface 61 on the front side when viewed from the direction of the arrow 57 in the bullet discharge port 54 is substantially parallel to the inner wall surface (upstream surface) 58 of the bullet discharge port 54.

 [0046] When the abrasive grains were supplied into the distributor 56 under the condition that the impeller 53 and the distributor 56 were rotated in the direction of the arrow 57, the structure configured as described above was fried while being stirred by the distributor 56. The barrel is supplied to the barrel outlet 54, and the supplied barrel is ejected from the barrel outlet 54 in the radial direction of the control cage 55 by the inner wall (upstream surface) 58 of the barrel outlet 54. While being blocked, it is discharged from the bullet outlet 54 and moves onto the blade 51 of the impeller 53. As a result, the barrel is discharged onto the blade 51 of the impeller 53 while being prevented from being scattered from the barrel outlet 54, so that the projection area of the barrel projected by the impeller 53 in a fan shape is larger than the conventional one. Narrow.

 Note that, in the above-described embodiment, the inner wall surface (upstream surface) 58 of the bullet discharge port 54 is the inner end portion (inner edge portion) of the inner wall surface (upstream surface) 58 perpendicular to the axial center line 59. It is inclined in the direction of arrow 57 at an angle of 70 degrees with respect to the center line 60 passing through (). However, this shape is not limited to this. As shown in FIG. 9, the inner wall 78 (upstream surface) on the rear side as seen from the direction of the arrow 57 in the gunball discharge port 74 of the control cage 75 is the circular inner wall of the control cage 75 in the direction of the arrow 57. It is also possible to make the shape of a plane extending substantially in the tangential direction, and to form the bullet outlet 74 of the control cage 75 in the shape of a substantially long hole extending in the direction of the axial center line 79 of the control cage 75 with a predetermined width.

[0048] Further, the inner wall surface (upstream surface) 78 of the bullet discharge port 74 is substantially the same as the inner wall surface (downstream surface) 81 on the front side as viewed from the direction of the arrow 57 in the bullet discharge port 74. It is parallel. Further, as shown in FIG. 9, the width of the predetermined dimension at the barrel 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 barrel discharge port 74 are as follows. (Upstream surface) 78 connecting the outer tip (outer edge) A of the line 91 and the inner center (inner edge) B of the inner wall surface (downstream surface) 81 at the axial center O and the bullet outlet 74 And The angle formed by the connecting line 92 is determined from 0 to 35 degrees.

[0049] In this configuration, when the abrasive grains were supplied into the distributor 56 with the impeller 53 and the distributor 56 rotated in the direction of the arrow 57, they were fried while being stirred by the distributor 56. Abrasive force The inner wall (upstream surface) 7 8 of the abrasive outlet 74 is smoothly pushed into the barrel outlet 74, and the pushed-in barrel is converged by the abrasive outlet 74. The particles are discharged from the particle discharge port 74 in a high density state and move 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 is narrower than the conventional one.

[0050] It should be noted that for the projection area formed by the abrasive grains projected in the fan shape, the barrel discharge port 54 · 74 of the control cage 55 · 75 of the present invention and the barrel discharge port of other various control cages Figure 10 shows a graph compared with.

[0051] From FIG. 10, it can be seen that the projectile projection area of the control cage 55 · 75 of the present invention is shorter than that of the other control cage. .

 Brief Description of Drawings

 FIG. 1 is a cross-sectional view of a main 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 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 invention of claim 8.

 FIG. 7 is an external front view of FIG.

 FIG. 8 is a partially cutaway longitudinal sectional view of an abrasive grain 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] FIG. 10 is a graph showing a projection area formed by abrasive grains projected in a fan shape, compared with the barrel discharge port of the control cage of the invention of claim 9 and the barrel discharge port of another control cage. It is.

Claims

The scope of the claims  [1] An impeller provided with a plurality of blades is rotated at a high speed, and the projection material discharged through an opening window of a cylindrical control cage disposed in the inner space of the impeller is projected onto a workpiece by the blade. A control cage used in a centrifugal projection device, wherein an opening window of the control cage is formed in a cylindrical portion of the control cage in parallel with an axis, and an upstream surface upstream of a rotation direction of the impeller It has a square shape with a downstream downstream surface,  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. A control cage characterized in that it is set to be larger than an angle formed by a plane including a core and a plane including the shaft core and the outer edge of the upstream surface.  2. The control cage according to claim 1, wherein the upstream surface and the downstream surface are parallel to each other.  [3] The control port norecan according to claim 1 or 2, wherein, in the cross section of the control cage, the upstream surface is formed on a tangent to an inner circumference of the control cage.  [4] The downstream surface is 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 when measured in a direction opposite to the rotation direction of the impeller. 4. The control cage according to claim 3, wherein the angle is set to be larger than an angle formed by a plane including the axis and a plane including the axis and the outer edge of the downstream surface. [5] The upstream surface and the downstream surface, when measured in a direction opposite to the rotation direction of the impeller, include a plane including the shaft core, and a plane including the shaft core and an inner edge of the downstream surface. An angle formed between the plane including the axis and a plane including the axis and the outer edge of the downstream surface, and the plane including the axis; Differential force between an angle formed by the plane including the axis and the outer edge of the upstream surface, and an angle formed by a plane including the axis and the inner edge of the downstream surface 0 to The control cage according to claim 1, wherein the control cage is set to 35 °. [6] a housing;  Drive means attached to the outside of one side of the housing;  An impeller attached to the drive shaft side of the drive means and having a plurality of blades; 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, 2, 3, 4 or 5, 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 [7] The impeller is  A side plate on the drive shaft side of the drive means;  A side plate on the introduction cylinder side that is located at a predetermined width away from the side plate on the introduction cylinder side 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 6, wherein the centrifugal projection device is a force.  [8] An impeller that is rotatably provided and has a columnar space at the center thereof, and a controller that is fixedly disposed in the columnar space of the impeller and has a substantially cylindrical shape and has a barrel discharge port at the body portion. An abrasive centrifugal projection device comprising: a cage; and a distributor disposed rotatably in the space of the control cage together with the impeller.  The barrel discharge port of the control cage is formed in a substantially long hole shape with a predetermined width and extending in a direction parallel to the axial center line of the control cage, and in the rotational direction of the distributor. On the other hand, it has an upstream upstream surface and a downstream downstream surface, The abrasive centrifuge is characterized in that the upstream surface is inclined toward the rotational direction of the distributor at an angle of 30 to 90 degrees with respect to a center line passing through the inner edge of the upstream surface orthogonal to the axial center line. Projection device. [9] An impeller that is rotatably provided and has a cylindrical space in the center, and a controller that is fixedly disposed in the cylindrical space of the impeller and has a substantially cylindrical shape, and has a barrel discharge port in the body. An abrasive centrifugal projection device comprising: a cage; and a distributor disposed rotatably in the space of the control cage together with the impeller.  The barrel discharge port of the control cage 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 with respect to the rotation direction of the distributor. An upstream upstream surface and a downstream downstream surface,  The abrasive centrifugal projection device, wherein the upstream surface extends in a substantially tangential direction of a circular inner wall of the control cage. [10] The downstream surface is perpendicular to the axial center line and passes through the inner edge of the downstream surface. 10. The cannonball centrifugal projection device according to claim 8, wherein the gunball centrifugal projection device is inclined toward the rotation direction of the distributor at an angle of 30 to 90 degrees. [11] The abrasive centrifugal projection device according to any one of [8] to [8], wherein the downstream surface is substantially parallel to the upstream surface. [12] The predetermined width at the bullet discharge port is perpendicular to the axial center line and connects to the outer edge of the upstream surface, and perpendicular to the axial center of the control cage and inside the downstream surface. The ambulatory centrifugal projection device according to any one of claims 8 to: L 1 characterized in that an angle formed by a line connecting the edge is determined by 0 to 35 degrees. . [13] The long hole in the bullet discharge port includes a rectangular opening. The gunball centrifugal projection device according to any one of? 9.