JP6504413B2 - Shot processing device - Google Patents

Description

  The present invention relates to a shot processing apparatus, and more particularly to a shot processing apparatus for projecting a projection material onto a plate-like workpiece conveyed along a conveyance path.

  There is known a shot processing apparatus which performs surface treatment processing by projecting a projection material onto a plate-like work, particularly a wide plate-like work (for example, a wide steel plate etc.) (Patent Document 1). In such a shot processing apparatus, in order to project a projection material evenly to a steel plate, a plurality of projectors are arranged in parallel in a direction orthogonal to the transport path, and the projection material is projected onto a wide work.

Republished Patent WO 2011/062056

  However, when the number of projectors used in the shot processing apparatus increases, there is a problem that the shot processing apparatus is enlarged.

  The present invention has been made to address the above problems, and it is an object of the present invention to provide a shot processing apparatus capable of performing good surface treatment processing on a plate-like work while suppressing the number of projectors. .

According to the invention
A shot processing device,
A roller conveyor including a plurality of rollers arranged in parallel at intervals, the plurality of rollers rotating to convey a plate-like workpiece in the conveyance direction;
A plurality of centrifugal type which are arranged in parallel in a direction orthogonal to the conveyance direction in a state of being alternately shifted in the conveyance direction at the upper side position and the lower side position of the roller conveyor, and projecting the projection material onto the work on the roller conveyor Equipped with a projector
The projector is
A control cage having a cylindrical shape, wherein a central axis line is arranged to extend in the conveyance direction of the work, a projection material is supplied to the inside, and an opening window is formed on a side wall to be an outlet of the projection material. With the cage,
An impeller having a plurality of blades arranged to extend radially outward of the control cage outside the control cage, wherein the impeller rotates about a central axis of the control cage, wherein the blade is rotated in the rotational direction And an impeller provided with an inclined portion inclined on the rear side in the rotational direction on the side surface,
The opening window has a first opening and a second opening in communication with each other,
The first opening and the second opening have a rectangular shape in which two sides are parallel to the central axis of the control cage, and the circumferential direction of the control cage is partially overlapped in the central axis direction of the control cage. Offset to each other and arranged adjacent to the central axis of the control cage,
There is provided a shot processing apparatus characterized in that.

  According to the above configuration, the plurality of projectors are arranged in parallel in the direction orthogonal to the work conveying direction in a state of being alternately shifted in the conveying direction at the upper side position and the lower side position of the roller conveyor. A projection material can be projected on the whole width direction of a workpiece | work, suppressing the collision (interference) of the projection material projected from an adjacent projector.

  In the present invention, since the control cage is arranged such that the central axis extends in the conveyance direction of the workpiece, the projection material discharged from the control cage is diffused and projected in the workpiece width direction.

  Here, on the surface of the blade of the impeller of the present invention, an inclined portion which is inclined rearward in the rotational direction with respect to the radial direction from the rotational center of the impeller is formed. Therefore, before the projection material discharged from the control cage opening window comes in contact with the surface of the blade, the projection material discharged later from the control cage opening window comes in contact with the blade surface and the tip of the blade It is accelerated towards the side. As a result, since the previously discharged projectiles and the later discharged projectiles contact the blade at a close position on the blade, the projectiles are collected near the surface of the blade. Therefore, dispersion of the projection material in the workpiece width direction at the time of projection is suppressed and centralized.

Further, the first opening and the second opening of the opening window have a rectangular shape in which two sides are parallel to the central axis of the control cage, and the control is performed in a state in which a part of them overlaps in the central axis direction of the control cage. It is offset in the circumferential direction of the cage and offset in the central axis direction of the control cage.
Thus, the projection materials discharged from the first opening and the second opening are discharged from the position offset in the circumferential direction of the control cage, that is, the shifted position. For this reason, the projection distribution of the entire projector is a combination of the projection distribution of the projection material discharged from the first opening and the projection distribution of the projection material discharged from the second opening.

Then, since the first opening and the second opening communicate with each other and partially overlap in the central axis direction of the control cage, each projection of the projection material discharged from the first opening and the second opening is generated. The distributions also overlap in part of each distribution width.
Therefore, in the entire projection distribution, the range in which the projection ratio is high (the range in which the concentration of projections is achieved) can be expanded. As a result, even if the distance between the projectors is set wider than in the prior art, it is possible to perform shot processing equal to or more than in the prior art.

According to another preferred aspect of the invention:
The rearward inclined portion is formed radially inward of the blade,
The blade is provided on the radially outward side of the rearward inclined portion with a non-rearward inclined portion having a smaller inclination angle to the rear side in the rotational direction than the backward inclined portion.

  According to such a configuration, since the non-backward inclined portion is formed on the tip end side of the blade, the projection material is centrifugally accelerated along the non-backwardly inclined portion until just before the blade is separated.

  The projection speed when the projection material is projected is the speed by centrifugal acceleration in the direction along the surface of the blade, and the speed in the tangential direction of the circle drawn by the tip of the rotating blade (hereinafter simply referred to as "tangential direction"). The synthesis speed of When the blade is tilted backwards, the tangential component of the velocity in the direction along the surface of the blade acts in a negative direction on the tangential velocity. As a result, when the rotational outer diameter and the peripheral rotational speed of the blade are the same, the combined speed when the blade is tilted backward is lower than the combined speed when the blade is not tilted backward.

  In the shot processing apparatus according to the present embodiment, the projection material is in contact with the non-backward inclined portion having a small inclination angle to the rear side immediately before the projection, so the velocity component along the blade surface is tangential velocity. On the other hand, there are few tangential components acting in the negative direction, and the degree of reducing the synthetic speed is small. As a result, efficient shot processing can be performed without increasing the number of rotations of the impeller and hence the number of rotations of the motor that rotates the impeller, and a decrease in the projection power efficiency can be suppressed.

  In the present specification, “an inclination angle to the rear in the rotational direction from the rear inclination part is smaller” means that the inclination angle is smaller than the inclination angle to the rear in the rotation direction of the rear inclination part, and extends in the radial direction , And a configuration in which the rotational direction is inclined forward.

According to another preferred aspect of the invention:
The radial length of the rearward inclined portion is set longer than the radial length of the non-rearward inclined portion.

  According to such a configuration, it is possible to sufficiently collect the projection material at the backward inclined portion of the blade and then accelerate the projection material at the non-rearward inclined portion.

According to another preferred aspect of the invention:
The first axial end portion of the control cage in the first opening and the second axial end portion of the control cage in the second opening are joined.

  According to such a configuration, since it is not necessary to provide a communication portion between the first opening and the second opening, the processability is also excellent.

According to another preferred aspect of the invention:
The rotation direction of the impeller of each of the plurality of projectors is set to the same direction.

  According to such a configuration, it is possible to suppress the collision (interference) ratio of projection materials projected from the adjacent projectors.

  Further, in the present invention, since the control cage is provided with two openings offset in the circumferential direction, the range where the projection ratio of each projector is high is broadened, and the blade is inclined on the rear side in the rotational direction. Because of this, the rising of the projection distribution curve becomes sharp. That is, the projection range from each projector can be limited. As a result, even if the rotation directions of the impellers of a plurality of projectors are set to the same direction, the amount of collision of the projection material on the inner wall side of the cabinet is suppressed.

According to another preferred aspect of the invention:
The first opening and the second opening are in communication via a third opening that connects the first opening and the second opening in a straight line or step-like manner.

  ADVANTAGE OF THE INVENTION According to this invention, the shot processing apparatus which enables it to perform favorable surface treatment process to a plate-shaped workpiece | work is provided, suppressing the number of objects of a projector.

It is a front view of the shot blasting apparatus of one embodiment of the present invention. It is a top view of the shot blasting apparatus of FIG. It is sectional drawing of the plain view of the projector included in the shot blasting apparatus of FIG. It is a longitudinal cross-sectional view of the side view of the projector of FIG. It is a side view which shows the control cage of the projector of FIG. It is a right view which shows the projection state by the upper side five projectors in the shot blasting apparatus of FIG. It is a figure which shows the projection density distribution corresponding to FIG. It is a figure which shows the projection state by six projectors of a contrast example. It is a figure which shows the projection density distribution corresponding to FIG. It is the figure which compared the projection density distribution of FIG. 7 with the projection density distribution of FIG. (A), (B) is a side view of the control cage of a modification.

  Next, with reference to the drawings, a shot blasting apparatus 10 which is a preferred embodiment of the shot processing apparatus of the present invention will be described. In the drawings, the arrow FR indicates the front side of the apparatus front view, the arrow UP indicates the apparatus upper side, and the arrow LH indicates the left side of the apparatus front view.

(Configuration of the embodiment)
FIG. 1 is a front view of the shot blasting apparatus 10, and FIG. 2 is a plan view of the shot blasting apparatus 10. The shot blasting apparatus 10 is an apparatus that projects a shot material from a centrifugal projector onto a plate-like workpiece W such as a steel plate conveyed along a conveyance path, and performs shot processing.
In the drawing, an arrow D appropriately shown indicates a direction (work transfer direction) in which the work W is transferred, and an arrow X indicates a direction (work width direction) orthogonal to the work transfer direction.

  As shown in FIG. 1 and the like, the shot blasting apparatus 10 includes a cabinet 12. The cabinet 12 is provided with an outer wall portion that divides the inner space from the outer space so that the projection material (also referred to as a shot or shot material, as an example, a steel ball) leaks from the inside of the cabinet 12 to the outside.

  As shown in FIG. 1, in the upper wall portion 14 of the cabinet 12, the portion on the upstream side (left side in the drawing) of the work transfer direction is about 30 on the upper side of the apparatus toward the downstream side (right side in the drawing) The inclined upper wall portion 14A is inclined. Further, in the upper wall portion 14 of the cabinet 12, a portion on the downstream side (right side in the figure) of the workpiece conveyance direction from the intermediate portion in the workpiece conveyance direction is a horizontal upper wall portion 14B parallel to the workpiece conveyance direction (arrow D direction). ing.

  In the lower wall portion 16 of the cabinet 12, a portion corresponding to the range excluding the end portion on the downstream side (right side in the drawing) of the work conveyance direction is a hopper portion 16V having a V shape in a front view of the apparatus. Of the hopper portion 16V, the portion on the upstream side (left side in the drawing) of the work conveyance direction is a first inclined lower wall portion 16A inclined by about 30 ° toward the lower side of the device toward the downstream side (right side in the drawing) It is done. Further, in the hopper portion 16V, a portion on the downstream side (the right side in the drawing) of the workpiece conveyance direction is a second inclined lower wall portion 16B inclined by about 30 ° toward the upper side of the apparatus toward the workpiece conveyance direction downstream side. .

  Inside the cabinet 12, a projection room 12A (also referred to as a "projection booth", a "processing room", or a "grinding room") is formed. The projection chamber 12A is a booth where surface processing (blasting in the present embodiment) is performed on the workpiece W by a projection material projected from a projector 40 described later. In the cabinet 12, a projection chamber inlet (not shown) is formed on the upstream side (left side in the drawing) of the workpiece conveyance direction, and a projection chamber outlet (not shown) is formed on the downstream side (right side in the drawing) .

  A roller conveyor 20 for conveying a plate-like work W is provided inside the cabinet 12 and extends through the cabinet 12 to constitute a conveyance path for the work W. The roller conveyor 20 is provided with a conveyor base 22 provided on both sides of the conveyance path, and a plurality of conveyor rollers 24 instructed to the conveyor base 22 rotatably. The plurality of conveyor rollers 24 are arranged parallel to each other at intervals along the work transfer direction (the direction of arrow D), and are rotationally driven simultaneously at the same speed by a drive mechanism (not shown) equipped with a motor. The roller conveyor 20 is configured to horizontally convey the plate-like workpiece W along the workpiece conveyance direction (the direction of the arrow D) by rotating the plurality of conveyor rollers 24.

  A plurality of centrifugal projectors 40 (five in the upper and lower five in the present embodiment, a total of ten in total) are attached to the inclined upper wall 14A and the first inclined lower wall 16A of the cabinet 12. The upper and lower projectors 40 are disposed so as to face the roller conveyor 20 and project the projectile toward the plate-like work W conveyed on the roller conveyor 20.

  In detail, five projectors 40 are respectively arranged in the direction orthogonal to the work conveyance direction at the upper side position and the lower side position of the roller conveyor (FIG. 2). Furthermore, the projectors 40 are alternately arranged in a zigzag manner in the workpiece conveyance direction (the direction of the arrow D) at the upper side position and the lower side position.

  The projection center of each projector 40 is set such that the projection angle of the front view of the device is inclined by about 30 ° with respect to the vertical direction of the device (vertical direction). In this setting, the shot processing ability (sharpening ability) is reduced while suppressing the amount of collision (interference) between the projection material projected toward the workpiece W and the projection material reflecting the workpiece W. It is for securing.

  A spraying device 26 is installed at an upper side position of the roller conveyor 20 on the downstream side (right side in the drawing) of the work conveyance direction in the cabinet 12. The spraying device 26 includes a blower 28. The blower 28 is provided on the horizontal upper wall portion 14B of the cabinet 12 and is operated by a drive motor. A duct (not shown) extending into the cabinet 12 is connected to the blower 28. At the lower part of the duct, a movable part which can move up and down is provided, and the movable part is provided with a nozzle (not shown) directed to the roller conveyor 20. The spraying device 26 is configured to blow air toward the roller conveyor 20 so as to blow off the projection material on the workpiece W.

  The blowing direction of the gas from the blowing device 26 is set to be a direction inclined downward toward the upstream side (left side in the drawing) of the work transfer direction. The movable part provided with the nozzle can be raised and lowered by the hoisting device 30 shown in FIG. The hoisting device 30 includes a wire rope (not shown) for lifting the movable portion and a drum 32 for winding the wire rope, and the movable portion is moved up and down by rotating the drum 32 by the reduction motor 34. It is configured.

  In addition, a projection material transfer mechanism is disposed adjacent to and on the upstream side (left side in the drawing) of the spray device 26 shown in FIG. The projectile transfer mechanism sucks up the projectiles blown up by the spray device 26 to a predetermined height position, and moves the projectiles outward in the workpiece width direction by a screw conveyor (not shown), thereby It is configured to be dropped to the bottom.

  A projection material introduction pipe 42 (also referred to as an "introduction pipe") is connected to each projection machine 40, and the projection material introduction pipe 42 is a projection material hopper 48 ("shot tank") via a flow rate adjustment device 44 and a pipe 46. Also connected). The projection material hopper 48 is a hopper for temporarily storing the projection material. Further, the flow rate adjustment device 44 includes an open / close gate (cut gate) for adjusting the flow rate of the projection material.

  The projector 40 is connected to the circulation device 50 via the projection material introduction pipe 42, the flow rate adjustment device 44, the pipe 46 and the projection material hopper 48. The circulation device 50 is a device that conveys the projection material projected by the projector 40 and circulates the material to the projector 40. The lower screw conveyor 52 is provided below the roller conveyor 20 of the cabinet 12.

  The lower screw conveyor 52 is provided in the valley portion of the hopper portion 16V, and is horizontally disposed so as to extend in the workpiece width direction. The lower screw conveyor 52 is configured to convey the projected projectiles and the like to the front side of the apparatus by rotating around the axis and to collect them at one place. The downstream end of the lower screw conveyor 52 is disposed at a position facing the lower collecting portion of the bucket elevator 54. The bucket elevator 54 is connected to the lower screw conveyor 52, and constitutes a part of a recovery path for recovering the projection material projected onto the work W.

  In the bucket elevator 54, an endless belt 54B is wound around a pulley 54A disposed at the upper and lower portions of the shot blasting apparatus 10 and rotationally driven by a motor drive, and a number of buckets (not shown) are attached to the endless belt 54B. Is a known structure. From the lower part of the apparatus, the bucket elevator 54 picks up a projection material etc. (a mixture containing the projection material projected onto the work W and the particulate foreign matter) dropped to the lower part of the apparatus and collected by the lower screw conveyor 52 Transport to the upper part of the device (upper side of the cabinet 12).

On the left side of the apparatus at the upper end of the bucket elevator 54, a separator 56 equipped with a wind force sorting mechanism is disposed adjacently. The wind force sorting mechanism of the separator 56 allows the mixture containing the projectile and the particulate foreign matter to fall naturally, and by applying an upward air flow to the mixture, it is possible to reduce the weight carried on the air flow and the falling weight. Sort out. A projectile hopper 48 is disposed below the separator 56, and is configured so that the reusable projectile from the separator 56 is supplied to the projectile hopper 48.
In addition, the separator may have a configuration in which the mixture is subjected to an air flow of another direction, for example, a horizontal direction.

  In addition, the separator 56 carries small fine particles (powder) in the air stream and discharges it to the dust collector (not shown) side, and also drops large fine particles (particulate) etc. having large particle size. It discharges to the rough delivery case (not shown) side through the rough delivery pipe 58.

Next, the projector 40 will be described in detail with reference to FIGS. 3 to 6.
FIG. 3 is a cross-sectional view of the projector 40 as viewed from the front, and FIG. 4 is a longitudinal cross-sectional view of the projector 40 as viewed from the side.

  As shown in FIG. 3, the projector 40 includes a case main body 72. The case body 72 has a substantially truncated pyramidal outer shape, and the bottom side (the lower side in FIG. 3) is opened to be a projection portion of the projection material. As shown in FIG. 4, left and right bases 72A extend from the bottom of the case body 72 in the direction away from each other, and the bases 72A are fixed to the upper wall of the cabinet 12 (FIG. 1).

  Further, in the side portion 72B on the downstream side (right side in FIG. 4) of the case main body 72 in the work transfer direction, a through hole is formed through which the tip of the bearing unit 74 or the like is inserted. On the other hand, in the side portion 72C on the upstream side (left side in FIG. 4) of the case main body 72 in the work conveyance direction, a through hole through which the introduction cylinder 70 is inserted is formed. The projection material introduction pipe 42 (FIG. 1) is connected to the introduction cylinder 70. On the other hand, a lid 80 is attached to the top of the case body 72. Further, the liner 78 is attached to the inside of the case body 72.

  A control cage 92 is disposed at the center of the inside of the case body 72. The control cage 92 is attached to a side portion 72C on the upstream side (left side in FIG. 4) of the case main body 72 in the workpiece transfer direction via a front cover 88. The control cage 92 has a cylindrical shape, is disposed concentric with the rotation axis 77X, and is configured to be supplied with the projection material from the introduction cylinder 70 inside.

  As shown in FIG. 2, the control cage 92 is disposed such that the central axis CL extends in the workpiece conveyance direction (the direction of the arrow D) in plan view of the apparatus. As shown in FIG. 4, an annular bracket 96 and a seal are provided between the inner periphery of the opening end of the control cage 92 on the upstream side (left side in FIG. 4) of the workpiece conveyance direction and the outer periphery of the introducing cylinder 70. A member 98 is disposed. In addition, a part of the introduction cylinder 70 is fixed to the main body of the projector 40 by an introduction cylinder presser (not shown).

  In the side wall 92A of the control cage 92, an opening window 60 serving as a discharge portion of the projection material is formed to penetrate. As shown in FIG. 5 which is a side view of the control cage 92, the opening windows 60 have the same size and shape, and include a first opening 62 and a second opening 64 communicating with each other.

  The first opening 62 has a rectangular shape surrounded by four sides including two sides parallel to the central axis line CL of the control cage 92, that is, two parallel sides 62X and 62Y. The second opening 64 has a rectangular shape surrounded by four sides including two sides parallel to the central axis line CL of the control cage 92, that is, two parallel sides 64X and 64Y.

  The first opening 62 and the second opening 64 are offset in the circumferential direction of the control cage 92 while partially overlapping in the direction of the central axis CL of the control cage 92, and adjacent in the direction of the central axis CL of the control cage It is arranged.

  As shown in FIG. 4, a tip end portion 74 </ b> A of the bearing unit 74 is connected to a central portion on the right side of the case main body 72 in the drawing. In detail, the tip end 74A of the bearing unit 74 is attached to the side 72B on the right side of the case body 72 in the figure. The bearing unit 74 includes a bearing 74B and rotatably supports the rotating shaft 77X.

  A second pulley 79 is attached to the proximal end of the rotating shaft 77X. An endless belt 81 is wound around the second pulley 79 and a first pulley (not shown) attached to the rotation shaft of the drive motor 76 (FIG. 2). Thereby, the rotational force of the drive motor 76 (FIG. 1) is transmitted to the rotating shaft 77X.

  A cylindrical portion 82A of a hub 82, which is a flanged cylindrical body, is fixed to a tip end portion 77A of the rotation shaft 77X by a key. A center plate 90 is bolted to the hub 82. Further, the distributor 94 is fixed to the tip end portion 77A of the rotation shaft 77X with a bolt 84 via the center plate 90.

  As shown in FIG. 3, a distributor 94 is disposed inside the control cage 92. The distributor 94 includes a plurality of radially extending vanes 94A inside and a plurality of openings equally spaced in the circumferential direction to form a gap between the control cage 92 and the control cage 92. It is located inside. The distributor 94 is rotated inside the control cage 92 by a drive motor 76 (FIG. 1).

  As the distributor 94 rotates, the projectiles supplied from the introduction cylinder 70 to the inside of the control cage 92 are stirred in the distributor 94, and from the opening of the rotating distributor 94, the distributor 94 and the control cage 92 are centrifuged. Supply to the gap between The projection material supplied to the gap moves in the gap in the rotational direction along the inner circumferential surface of the control cage 92 and is discharged radially outward from the openings 62, 64 of the control cage 92.

  At this time, the discharge direction of the projection material from the first opening 62 and the second opening 64 of the control cage 92 is in the radial direction from the rotation center of the distributor 94 (the same as the rotation center C of the impeller 100 described later). This is a direction inclined in the rotation direction (arrow R direction) of the impeller 100.

As shown in FIGS. 3 and 4, an impeller 100 is provided outside the control cage 92. The impeller 100 has a side plate unit 102, and the side plate unit 102 includes an annular first side plate 102A, and an annular second side plate 102B disposed to face the first side plate 102A at a distance. ing.
A flange 82B extending radially outward from one axial end of the cylindrical portion 82A of the hub 82 is bolted to the first side plate 102A. The first side plate 102A and the second side plate 102B are connected by a connecting member 102C.

  Furthermore, the impeller 100 further includes a plurality of blades (blades) 104 arranged to extend radially outward of the control cage 92 between the first side plate 102A and the second side plate 102B. The impeller 100 obtains rotational force by the operation of the drive motor 76 (FIG. 1) and rotates in the circumferential direction of the control cage 92. The rotation direction of the impeller 100 and the rotation direction of the distributor 94 are set in the same direction. The respective blades are disposed along the outer periphery of the control cage 92 in an inclined direction such that the radially outer end thereof is positioned on the outer peripheral side of the control cage 92 on the rear side in the rotational direction of the impeller 100 (arrow R direction). It is done. The rotary shafts of the impellers 100 of the plurality of projectors 40 arranged in parallel extend in the workpiece conveyance direction, and the rotation directions are set to the same direction (clockwise direction in FIG. 6).

  As shown in FIG. 3, the surface 106 on the front side in the rotational direction of the blade 104 is provided with a rear inclined portion 110 that is inclined to the rear side in the rotational direction on the radially inner (proximal end) side. The rearward inclined portion 110 is preferably inclined rearward in the rotational direction at an angle of 30 ° to 50 ° with respect to the radial direction of the impeller 100, and is inclined at 40 ° in the present embodiment.

Further, on the tip side of the surface 106 of the blade 104 (that is, on the radially outer side of the rearward inclined portion 110), the non-rear end extends in a substantially radial direction (radial line L2 direction) from the rotation center C of the impeller 100. Inclined portion 114 is formed. That is, the non-rearward inclined portion 114 is set to have a smaller inclination angle to the rear in the rotational direction than the rear inclined portion 110.
The radial length of the rearward inclined portion 110 is set longer than the radial length of the non-rearward inclined portion 114. Further, the rearward inclined portion 110 and the non-rearward inclined portion 114 are connected by the curved portion 112.

  Further, the surface 108 opposite to the surface 106 of the blade 104 is provided at the proximal end with an inclined portion 116 which is inclined rearward in the rotational direction more than the backward inclined portion 110 with respect to the radial direction. On the back surface 108 of the blade 104, a protruding portion 118 is formed to project at a radially intermediate portion. In the raised portion 118, the radially outer concave curved portion of the impeller 100 abuts on the connecting member 102C.

(Operation / effect of the embodiment)
Next, the operation and effects of the above embodiment will be described.
In the shot blasting processing apparatus 10 of the present embodiment, the roller conveyor 20 conveys the plate-like work W in the work conveyance direction (the direction of the arrow D) by rotating the plurality of conveyor rollers 24. Further, a plurality of centrifugal projectors 40 provided on the upper side and the lower side of the roller conveyor 20 project the projection material onto the work W.

  Here, as shown in FIG. 2, the plurality of projectors 40 are arranged in parallel in the workpiece width direction (arrow X direction) and are alternately shifted in the workpiece conveyance direction (arrow D direction). . For this reason, a projection material is projected with respect to the whole area | region of a workpiece | work width direction (arrow X direction), the collision (interference) of projection materials from each projector being suppressed.

  As shown in FIG. 3, in the projector 40, the impeller 100 disposed radially outward of the control cage 92 accelerates and projects the projectile discharged from the control cage 92 by the blade 104. The projectiles accelerated and projected by the rotation of the impeller 100 are dispersed and projected to some extent. In the present embodiment, the central axis of the control cage 92 (FIG. 5) (axial center coinciding with the rotation center C of the impeller 100) is disposed so as to face the workpiece conveyance direction (arrow D direction) in plan view of the apparatus. Thus, the projection material projected by the rotation of the impeller 100 is projected so as to be diffused in the workpiece width direction (arrow X).

  Here, as shown in FIG. 3, the surface 106 of the blade 104 of the impeller 100 of the present embodiment is inclined rearward with respect to the radial direction of the impeller 100 so as to be inclined rearward in the rotational direction (arrow R direction). The part 110 is formed. Therefore, the timing at which the projection material discharged from the control cage 92 first contacts the surface 106 of the blade 104 can be delayed. As a result, when the previously discharged projection material comes in contact with the surface 106 of the blade 104, the later discharged projection material and the previously discharged projection material gather at a position adjacent to the surface 106 of the blade 104. Be As a result, the projection material can be more effectively concentrated at the rearward inclined portion 110 of the surface 106 of the blade 104. That is, the rising of the projection distribution curve of the projection material discharged from the predetermined position in the circumferential direction of the control cage 92 becomes sharp.

  On the other hand, as shown in FIG. 5, the opening window 60 of the control cage 92 is provided with two openings, a first opening 62 and a second opening 64, which serve as a discharge portion of the projection material. The first opening 62 and the second opening 64 are offset in the circumferential direction of the control cage 92 in a state of partially overlapping in the direction of the central axis CL of the control cage 92, and in the direction of the central axis CL of the control cage It is located adjacent to.

  With such a configuration, the projection materials discharged from the first opening 62 and the second opening 64 are discharged from the circumferentially offset position of the control cage 92. Therefore, the projection distribution as the whole of the opening window is a distribution obtained by combining the projection distribution of the projection material discharged from the first opening 62 and the projection distribution of the projection material discharged from the second opening 64.

  Here, since the first opening 62 and the second opening 64 communicate with each other and partially overlap in the direction of the central axis CL of the control cage 92, the first opening 62 and the second opening 64 respectively The respective projection distributions of the ejected projectiles also partially overlap. For this reason, as a whole projection distribution, the range in which the projection ratio is high (the range in which the concentration of projections is achieved) can be expanded.

  As described above, in the present embodiment, the rising of the projection distribution curve of the projection material is sharpened by the action of the backward inclined portion 110, and the projection ratio is high due to the actions of the first opening 62 and the second opening 64. A projection distribution in which the range (the range in which projection concentration is achieved) is expanded is obtained. For this reason, even if the distance between the projectors 40 shown in FIG. 6 in the arrangement direction is set wider than in the prior art, it is possible to perform shot processing equal to or greater than the conventional one.

  This point will be supplementarily explained in comparison with a comparative example. A shot blasting apparatus 200 of a comparative example is shown in FIG. In FIG. 8, the same components as those in this embodiment are denoted by the same reference numerals.

  The shot blasting apparatus 200 includes six projectors 202 arranged in parallel in the direction perpendicular to the work transfer direction on the upper side of the roller conveyor 20, ie, in the work width direction (arrow X direction). The six projectors 202 are arranged such that the rotation axis of the impeller 204 extends in the work transfer direction as in the present embodiment. In the blade of the impeller 204, the surface directed in the rotational direction extends radially from the center of rotation. Furthermore, the control cage is formed with one rectangular opening window having two sides parallel to the cylinder axis.

  As described above, in the projector 202 of the shot blasting apparatus 200 shown in FIG. 8, since the inclined portion is not provided on the surface of the blade, the projection of the projection material is in the workpiece width direction (arrow X compared to this embodiment). Dispersion in the direction) is large.

  FIG. 7: is drawing which shows the projection density distribution corresponding to FIG. 6 which shows the projection distribution by the shot blast processing apparatus of this embodiment. FIG. 9 is a drawing showing a projection density distribution corresponding to FIG. 8 showing a projection distribution by the shot blast processing apparatus of the comparative example.

  In FIG. 7, the dotted line shows the projection density distribution of each projector 40 (FIG. 6), and the solid line shows the projection density distribution obtained by combining the projection density distribution of each projector 40 (FIG. 6). Further, in FIG. 9, a dashed-dotted line indicates the projection density distribution of each projector 202 (FIG. 8), and a two-dot dashed line indicates a projection distribution obtained by synthesizing the projection density distribution of each projector 202 (FIG. 8). FIG. 10 is a diagram comparing the combined projection density distribution of FIG. 7 with the combined projection density distribution of FIG.

  When FIG. 7 and FIG. 9 are compared, each projection density distribution curve (dotted line of FIG. 7) of the projector 40 (FIG. 6) of the shot blast processing apparatus 10 of this embodiment is the projector 202 (FIG. 8) of a comparative example. As compared with the respective projection density distribution curves (the alternate long and short dash lines in FIG. 9), the range in which the rising is rapid and the high projection density is wide. In other words, each projection density distribution curve (one-dot chain line in FIG. 9) of the projector 202 (FIG. 8) of the comparative example is a curve close to an inverted V shape, the projector 40 of this embodiment Each projection density distribution curve (dotted line in FIG. 7) in FIG. 6) is a curve close to an inverted U shape.

  For this reason, as shown in FIG. 6, even if the number of projectors is reduced by one compared with the comparative example and the distance between the projectors 40 in parallel is set wider than in the prior art, it is shown in FIG. As described above, it is possible to perform shot processing equal to or greater than that of the comparative example.

  Supplementally referring to FIG. 10, in the case of the present embodiment, the projection distribution is closer to flat than in the case of the comparative example, and the projection unevenness as a whole is suppressed as compared with the case of the comparative example. I understand. For this reason, since it is possible to suppress the excessive projection due to the projection unevenness, it is possible to suppress the waste of the projection material and the power consumption.

  Further, in the present embodiment, as shown in FIG. 3, the inclined portion 110 is formed on the base end side of the blade 104, and on the tip end side of the surface 106 of the blade 104, the radial direction of the impeller 100 ( A non-inclined portion 114 extending in the radial direction L2) is formed. For this reason, the projection material concentrated at the inclined portion 110 is projected after increasing the speed at the non-inclined portion 114. As a result, since the projection speed can be efficiently increased, it is not necessary to rotate the impeller 100 at high speed more than necessary, and power consumption can be suppressed.

  Further, in the present embodiment, the length of the inclined portion 110 is set to be longer than the length of the non-inclined portion 114 as viewed in the rotational axis direction of the impeller 100. Therefore, after the projectiles are sufficiently collected by the inclined portion 110 of the blade 104, the velocity of the projectile can be increased by the non-inclined portion 114.

  Further, in the present embodiment, as shown in FIG. 5, the first opening 62 and the second opening 64 are formed to be in direct contact with each other. For this reason, since it is not necessary to provide the communication part which connects both between the 1st opening 62 and the 2nd opening 64, it is excellent also in workability.

  Further, in the present embodiment, the rotation directions of the impellers 100 of the plurality of projectors 40 arranged in parallel are set to the same direction (clockwise direction in FIG. 6). For this reason, the collision (interference) of projection materials projected from the different impeller 100 can be suppressed.

  Further, in the present embodiment, the range in which the projection ratio of each projector 40 is high is expanded and the rising of the projection distribution curve is rapid, so each impeller 100 in the plurality of projectors 40 arranged in parallel is Even if the direction of rotation of is set to the same direction (clockwise direction in FIG. 6), the amount of collision of the projection material on the inner wall side of the cabinet 12 is suppressed.

  As mentioned above, according to the shot blasting apparatus 10 of this embodiment, the surface treatment process of the workpiece | work W which is a plate member can be carried out favorably, suppressing the number of objects of the projector 40. As shown in FIG. In addition, since the number of projectors 40 can be reduced, the cost can be reduced and the maintainability can be improved.

  Without being limited to the above-described embodiment of the present invention, various changes and modifications are possible within the scope of the technical idea described in the claims.

  In the above embodiment, the shot processing apparatus is a shot blasting apparatus, but the shot processing apparatus of the present invention may be another shot processing apparatus, for example, a shot peening apparatus.

Further, in the opening window 60 of the control cage of the above embodiment, as shown in FIG. 5, the first opening 62 and the second opening 64 are formed so as to be in direct contact with each other. A communication portion may be provided between the first opening and the second opening to allow both to communicate with each other.
The communication part may connect the first opening and the second opening linearly, or may connect the first opening and the second opening in a step-like manner.

  Specifically, it may be a control cage 92 'in which the first opening and the second opening are connected by a linear communication portion 63' (Fig. 11 (A)). Furthermore, a control cage 92 ′ ′ in which the first opening and the second opening are connected by a stepped communication portion 63 ′ ′ may be used (FIG. 11 (B)).

  Furthermore, in the impeller of the above embodiment, the inclined portion 110 of the blade is inclined 40 ° rearward with respect to the radial direction (radial line L1) of the impeller 100, and the inclination angle of the inclined portion is 30 Although it is preferred that the angle be 50 to 50 degrees, the inclination angle of the inclined portion may be another angle such as 25 or 55 with respect to the radial direction.

  In addition, the non-inclined portion formed on the tip end side of the surface of the blade is inclined rearward in the rotational direction, but the inclination angle is smaller than the inclination angle of the backward inclined portion It may be configured to be inclined forward. Further, the non-inclined portion may not be formed on the surface of the blade.

In addition, when the size of the impeller is large or the like, the length of the inclined portion may be set equal to the length of the non-inclined portion in the rotational axis direction of the impeller.
In addition, in the surface of the blade, the inclined portion and the non-inclined portion may be continuous without interposing the curved portion. Further, the inclined portion 116 may not be provided at the base end of the back surface of the blade.

Also, the impeller may be attached to the rotational shaft of the drive motor via a hub.
Moreover, the projector 40 shown by FIG. 6 may be arrange | positioned by the front and back reverse direction (as the front side in a figure turns into a back side). Alternatively, only the projector 40 at the left end in the drawing of FIG. 6 may be disposed in the reverse direction (with the front side in the drawing being the back side).

  You may combine the said embodiment and the above-mentioned several modification suitably.

10: shot blasting apparatus 20: roller conveyor 24: conveyor roller 40: projector 60: opening window 62: first opening 62X, 62Y: parallel two sides 64 of first opening 64: second opening 64X, 64Y: second opening Parallel two sides 92: control cage 92A: outer peripheral wall 100: impeller 104: blade 110: inclined portion C: rotation center of impeller CL: central axis D: workpiece conveyance direction R: rotation direction of impeller W: workpiece X: Work width direction

Claims (6)

A shot processing device,
A roller conveyor including a plurality of rollers arranged in parallel at intervals, the plurality of rollers rotating to convey the workpiece in the conveyance direction;
A plurality of centrifugal type which are arranged in parallel in a direction orthogonal to the conveyance direction in a state of being alternately shifted in the conveyance direction at the upper side position and the lower side position of the roller conveyor, and projecting the projection material onto the work on the roller conveyor Equipped with a projector
The projector is
A control cage having a cylindrical shape, wherein a central axis line is arranged to extend in the conveyance direction of the work, a projection material is supplied to the inside, and an opening window is formed on a side wall to be an outlet of the projection material. With the cage,
An impeller having a plurality of blades arranged to extend radially outward of the control cage outside the control cage, wherein the impeller rotates about a central axis of the control cage, wherein the blade is rotated in the rotational direction And an impeller provided with an inclined portion inclined on the rear side in the rotational direction on the side surface,
The opening window has a first opening and a second opening in communication with each other,
The first opening and the second opening have a rectangular shape in which two sides are parallel to the central axis of the control cage, and the circumferential direction of the control cage is partially overlapped in the central axis direction of the control cage. Offset to each other and arranged adjacent to the central axis of the control cage,
A shot processing apparatus characterized in that. The rearward inclined portion is formed radially inward of the blade,
The blade includes a non-backwardly inclined portion on the radially outward side of the backwardly inclined portion, with a small inclination angle to the rear side in the rotational direction from the backwardly inclined portion.
The shot processing apparatus according to claim 1. The radial length of the rearward inclined portion is set longer than the radial length of the non rearwardly inclined portion.
The shot processing apparatus according to claim 2. The first axial end portion of the control cage in the first opening and the second axial end portion of the control cage in the second opening are joined.
The shot processing apparatus according to any one of claims 1 to 3. The rotational direction of the impeller of each of the plurality of projectors is set to the same direction,
The shot processing apparatus according to any one of claims 1 to 4. The first opening and the second opening are in communication via a third opening that connects the first opening and the second opening in a straight line or step-like manner.
The shot processing apparatus according to any one of claims 1 to 5.

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