WO2016013526A1 - ショット処理装置 - Google Patents
ショット処理装置 Download PDFInfo
- Publication number
- WO2016013526A1 WO2016013526A1 PCT/JP2015/070593 JP2015070593W WO2016013526A1 WO 2016013526 A1 WO2016013526 A1 WO 2016013526A1 JP 2015070593 W JP2015070593 W JP 2015070593W WO 2016013526 A1 WO2016013526 A1 WO 2016013526A1
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- WIPO (PCT)
- Prior art keywords
- opening
- control cage
- central axis
- projection
- workpiece
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/08—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces
- B24C3/10—Abrasive blasting machines or devices; Plants essentially adapted for abrasive blasting of travelling stock or travelling workpieces for treating external surfaces
- B24C3/14—Apparatus using impellers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/06—Impeller wheels; Rotor blades therefor
Definitions
- the present invention relates to a shot processing apparatus, and more particularly, to a shot processing apparatus that projects a projection material onto a plate-like workpiece conveyed along a conveyance path.
- a shot processing apparatus in which a projection material is projected onto a plate-shaped workpiece, particularly a wide plate-shaped workpiece (for example, a wide steel plate) (Patent Document 1).
- a projection material is projected onto a plate-shaped workpiece, particularly a wide plate-shaped workpiece (for example, a wide steel plate) (Patent Document 1).
- a plurality of projectors are arranged in parallel in a direction orthogonal to the conveyance path, and the projection material is projected onto a wide workpiece.
- the present invention has been made to address the above-described problems, and an object thereof is to provide a shot processing apparatus that can perform a good surface treatment on a plate-shaped workpiece while suppressing the number of projectors. .
- a shot processing device comprising a plurality of rollers arranged in parallel at intervals, and the plurality of rollers rotating to convey a plate-like workpiece in the conveyance direction;
- a plurality of centrifugal types that are arranged in parallel in a direction orthogonal to the transport direction while being alternately displaced in the transport direction at an upper position and a lower position of the roller conveyor, and project a projection material onto a work on the roller conveyor.
- a projector, and The projector is A control cage having a cylindrical shape, which is arranged such that a central axis extends in the conveyance direction of the workpiece, a projection material is supplied inside, and an opening window serving as a discharge port for the projection material is formed on a side wall.
- An impeller comprising a plurality of blades arranged so as to extend outward in the radial direction of the control cage outside the control cage and rotating about a central axis of the control cage.
- An impeller provided with an inclined portion inclined to the rear side in the rotational direction on the surface on the side,
- the opening window has a first opening and a second opening communicating with each other;
- the first opening and the second opening have a rectangular shape with two sides parallel to the central axis of the control cage, and the circumferential direction of the control cage is partially overlapped with the central axis of the control cage.
- a shot processing apparatus is provided adjacent to the central axis direction of the control cage.
- the plurality of projectors are arranged in parallel in the direction orthogonal to the workpiece conveyance direction in a state of being alternately displaced in the conveyance direction at the upper position and the lower position of the roller conveyor.
- the projection material can be projected over the entire width direction of the workpiece while suppressing the collision (interference) of the projection material projected from the adjacent projector.
- control cage since the control cage is arranged so that the central axis extends in the workpiece conveying direction, the projection material discharged from the control cage is diffused and projected in the workpiece width direction.
- the first opening and the second opening of the opening window have a rectangular shape with two sides parallel to the central axis of the control cage, and the control window is partially overlapped 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.
- emitted from 1st opening and 2nd opening is discharged
- 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.
- each projection of the projection material discharged from the first opening and the second opening respectively. Distributions also overlap in part of each distribution width. For this reason, in the entire projection distribution, a range in which the projection ratio is high (a range in which projections are concentrated) is expanded. As a result, even if the interval between the projectors is set wider than that in the past, it is possible to perform shot processing equivalent to or higher than that in the past.
- the backward inclined portion is formed on the radially inner side of the blade,
- the blade is provided with a non-backward tilt portion having a small tilt angle from the rearward tilt portion to the rear side in the rotational direction on the radially outward side of the rearward tilt portion.
- the projection material is centrifugally accelerated along the non-backward inclined portion until immediately before it is detached from the blade.
- the projecting speed when the projecting material is projected includes 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”). It becomes the synthesis speed of.
- tangential direction the speed in the tangential direction of the circle drawn by the tip of the rotating blade.
- the projection material is in contact with the non-backward inclined portion having a small inclination angle toward the rear side until immediately before the projection, so the velocity component along the blade surface has a tangential velocity.
- the tangential direction component acting in the negative direction is small, and the degree of reducing the synthesis speed is small.
- the inclination angle to the rear side in the rotational direction is smaller than that of the rearward inclined portion means that the inclination angle is smaller than the inclination angle to the rearward side in the rotational direction of the rearward inclined portion, and the structure extends in the radial direction. And a configuration that is inclined forward in the rotational direction.
- the one end part of the first opening in the central axis direction of the control cage and the other end part of the second opening in the central axis direction of the control cage are joined.
- the control cage is provided with two openings that are offset in the circumferential direction, a range in which the projection ratio of each projector is high is widened, and the blade is inclined to the rear side in the rotational direction. Is provided, the rise of the projection distribution curve becomes steep. That is, the projection range from each projector can be limited. As a result, even if the rotation directions of the impellers of the plurality of projectors are set in the same direction, the amount of projection material colliding with the inner wall of the cabinet is suppressed.
- the first opening and the second opening are communicated with each other through a third opening that connects the first opening and the second opening in a straight line shape or a step shape.
- a shot processing apparatus capable of performing a good surface treatment on a plate-like workpiece while suppressing the number of projectors.
- FIG. 3 It is a front view of the shot blasting device 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 front view of the projector contained in the shot blasting apparatus of FIG. It is a longitudinal cross-sectional view of the projector of FIG. 3 in a side view. 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 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 contrast. 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.
- an arrow FR indicates the front side of the apparatus viewed from the front
- an arrow UP indicates the upper side of the apparatus
- an arrow LH indicates the left side of the apparatus viewed from the front.
- FIG. 1 is a front view of the shot blasting apparatus 10
- FIG. 2 is a plan view of the shot blasting apparatus 10.
- the shot blasting apparatus 10 is an apparatus that performs a shot process by projecting a projection material from a centrifugal projector onto a plate-like workpiece W such as a steel plate conveyed along a conveyance path.
- a arrow D appropriately shown in the drawing indicates a direction in which the workpiece W is transferred (work transfer direction)
- an arrow X indicates a direction (work width direction) orthogonal to the work transfer direction.
- the shot blasting apparatus 10 includes a cabinet 12.
- the cabinet 12 includes an outer wall portion that partitions the internal space and the external space so that a projection material (also referred to as a shot or a shot material, for example, a steel ball as an example) does not leak out of the cabinet 12.
- a projection material also referred to as a shot or a shot material, for example, a steel ball as an example
- a portion of the upper wall portion 14 of the cabinet 12 on the upstream side in the workpiece conveyance direction is approximately 30 on the upper side of the apparatus toward the downstream in the workpiece conveyance direction (right side in the drawing).
- the inclined upper wall portion 14A is inclined.
- a portion on the downstream side (right side in the drawing) 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.
- the lower wall portion 16 of the cabinet 12 has a V-shaped hopper portion 16V in a front view of the apparatus, corresponding to a range excluding an end portion on the downstream side in the workpiece conveyance direction (right side in the drawing).
- a portion on the upstream side in the workpiece conveyance direction is a first inclined lower wall portion 16A inclined about 30 ° toward the apparatus lower side toward the downstream side in the workpiece conveyance direction (right side in the drawing).
- a portion on the downstream side in the workpiece conveyance direction is a second inclined lower wall portion 16B that is inclined about 30 ° toward the upper side of the apparatus toward the downstream side in the workpiece conveyance direction.
- a projection chamber 12 ⁇ / b> A (also referred to as “projection booth”, “processing chamber”, or “polishing chamber”) is formed inside the cabinet 12, a projection chamber 12 ⁇ / b> A (also referred to as “projection booth”, “processing chamber”, or “polishing chamber”) is formed.
- the projection chamber 12A is a booth in which surface processing (blast processing in the present embodiment) is performed on the workpiece W by a projection material projected from a projector 40 described later.
- the cabinet 12 has a projection chamber inlet (not shown) on the upstream side in the workpiece conveyance direction (left side in the drawing), and a projection chamber outlet (not shown) on the downstream side in the workpiece conveyance direction (right side in the drawing). .
- a roller conveyor 20 that conveys the plate-like workpiece W is provided, and extends through the cabinet 12 to constitute a conveyance path for the workpiece W.
- the roller conveyor 20 includes a conveyor base 22 provided on both sides of the conveyance path, and a plurality of conveyor rollers 24 that are instructed to rotate by the conveyor base 22.
- the plurality of conveyor rollers 24 are arranged in parallel to each other at intervals along the workpiece conveyance direction (arrow D direction), and are simultaneously rotated at the same speed by a drive mechanism (not shown) provided with a motor.
- the roller conveyor 20 conveys the plate-shaped workpiece
- centrifugal projectors 40 (a total of 10 units in the upper and lower units in this embodiment) are attached.
- the upper side projector 40 and the lower side projector 40 are arranged so as to face the roller conveyor 20 and project the projection material toward the plate-like workpiece W conveyed on the roller conveyor 20.
- five projectors 40 are arranged side by side in a direction orthogonal to the workpiece conveyance direction, each at an upper position and a lower position of the roller conveyor (FIG. 2). Further, the projectors 40 are arranged in a zigzag pattern alternately shifted in the workpiece transfer direction (arrow D direction) at each of the upper side position and the lower side position.
- the projection center of each projector 40 is set such that the projection angle when viewed from the front of the apparatus is inclined by about 30 ° with respect to the vertical direction of the apparatus. What is set in this way is that 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 reflected from the workpiece W. This is to ensure.
- the blowing direction of the gas from the blowing device 26 is set so as to be inclined downward toward the upstream side of the workpiece conveyance direction (left side in the figure).
- the movable part provided with the nozzle can be moved up and down by the hoisting device 30 shown in FIG.
- the hoisting device 30 includes a wire rope (not shown) for lifting the movable part, and a drum 32 for winding the wire rope, and the drum 32 is rotated by an electric motor 34 with a speed reducer so that the movable part is moved up and down. It is configured.
- a projection material transfer mechanism is disposed adjacently.
- the blasting material transfer mechanism sucks up the blasting material blown up by the spraying device 26 to a predetermined height position, and moves these blasting materials outward by the screw conveyor (not shown) in the workpiece width direction. It is comprised so that it may fall to a bottom part.
- a projection material introduction pipe 42 (also referred to as “introduction pipe”) is connected to each projector 40, and the projection material introduction pipe 42 is connected to a projection material hopper 48 (“shot tank”) via a flow rate adjusting device 44 and a pipe 46. Connected).
- the projection material hopper 48 is a hopper for temporarily storing the projection material.
- the flow rate adjusting 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 a projection material introduction pipe 42, a flow rate adjusting device 44, a pipe 46 and a projection material hopper 48.
- the circulation device 50 is a device that conveys the projection material projected by the projector 40 and circulates it to the projector 40, and includes a lower screw conveyor 52 on the lower side of the roller conveyor 20 of the cabinet 12.
- the lower screw conveyor 52 is provided in a 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 projection material or the like to the front side of the apparatus and collect it in one place by rotating around the axis.
- the downstream end of the lower screw conveyor 52 is disposed at a position facing the lower collection part 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 workpiece W.
- an endless belt 54B is wound around a pulley 54A that is disposed at the upper and lower portions of the shot blasting apparatus 10 and is driven to rotate by a motor.
- a number of buckets (not shown) are attached to the endless belt 54B. It is a known structure.
- the bucket elevator 54 scoops up the projecting material and the like (a mixture containing the projecting material projected on the work W and the granular foreign matter) collected by the lower screw conveyor 52 by dropping into the lower part of the apparatus from the lower part of the apparatus. It is transported to the upper part of the apparatus (above the cabinet 12).
- a separator 56 On the left side of the apparatus at the upper end of the bucket elevator 54, a separator 56 provided with a wind sorting mechanism is disposed adjacently.
- the wind power sorting mechanism of the separator 56 naturally drops the mixture containing the projection material and the particulate foreign matter, and applies an upward airflow to the mixture, so that a lightweight object placed on the airflow and a heavy object falling. Sort out.
- a projection material hopper 48 is disposed below the separator 56, and a reusable projection material from the separator 56 is supplied to the projection material hopper 48.
- the separator may have a configuration in which an airflow in another direction, for example, a lateral direction is applied to the mixture.
- the separator 56 puts fine powder (powder) having a small particle size on the airflow and discharging it to the dust collector (not shown) side, and drops the heavy powder (granular material) having a large particle size and the like. It is discharged through a roughing pipe 58 to the roughing case (not shown).
- FIGS. 3 is a cross-sectional view of the projector 40 as viewed from the front
- FIG. 4 is a vertical cross-sectional view of the projector 40 as viewed from the side.
- the projector 40 includes a case main body 72.
- the case main body 72 has an outer shape of a substantially truncated pyramid, and the bottom side (the lower side in FIG. 3) is opened to form a projection portion of the projection material.
- the left and right bases 72 ⁇ / b> A extend from the bottom of the case main body 72 in directions away from each other, and the base 72 ⁇ / b> A is fixed to the upper wall portion of the cabinet 12 (FIG. 1).
- a through hole through which the tip of the bearing unit 74 and the like is inserted is formed in the side portion 72B on the downstream side (right side in FIG. 4) of the case main body 72 in the workpiece conveyance direction.
- a through-hole through which the introduction tube 70 is inserted is formed in the side portion 72C on the upstream side (left side in FIG. 4) of the case main body 72 in the workpiece conveyance direction.
- a projecting material introduction pipe 42 (FIG. 1) is connected to the introduction cylinder 70.
- a lid 80 is attached to the top of the case main body 72.
- the liner 78 is attached to the inside of the case main body 72.
- a control cage 92 is disposed in the center of the inside of the case main 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 work transfer direction via a front cover 88.
- the control cage 92 has a cylindrical shape, is disposed concentrically with the rotation shaft 77X, and is configured such that the projection material is supplied from the introduction tube 70 to the inside.
- an opening window 60 serving as a discharge portion for the projection material is formed so as to penetrate therethrough.
- the opening window 60 has a first opening 62 and a second opening 64 that have the same size and shape and communicate with each other.
- the first opening 62 has a rectangular shape surrounded by four sides including two sides parallel to the central axis CL of the control cage 92, that is, the parallel two sides 62X and 62Y.
- the second opening 64 has a rectangular shape surrounded by four sides including two sides parallel to the central axis CL of the control cage 92, that is, the parallel two sides 64X and 64Y.
- the first opening 62 and the second opening 64 are offset in the circumferential direction of the control cage 92 in a state of being partially overlapped in the direction of the central axis CL of the control cage 92, and adjacent to the direction of the central axis CL of the control cage Are arranged.
- the tip end portion 74 ⁇ / b> A of the bearing unit 74 is connected to the center portion on the right side of the case main body 72 in the drawing. Specifically, the tip end portion 74 ⁇ / b> A of the bearing unit 74 is attached to the side portion 72 ⁇ / b> B on the right side of the case main body 72 in the drawing.
- the bearing unit 74 includes a bearing 74B and rotatably supports the rotary shaft 77X.
- the cylindrical portion 82A of the hub 82 which is a flanged cylindrical body, is fixed to the tip portion 77A of the rotating shaft 77X with a key.
- a center plate 90 is fixed to the hub 82 with bolts.
- 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.
- the distributor 94 is disposed inside the control cage 92.
- the distributor 94 includes a plurality of blades 94 ⁇ / b> A extending in the radial direction therein and a plurality of openings arranged at equal intervals in the circumferential direction, and the control cage 92 is configured so as to form a gap with the control cage 92. Arranged inside.
- the distributor 94 is rotated inside the control cage 92 by a drive motor 76 (FIG. 1).
- the projection material supplied from the introduction cylinder 70 to the inside of the control cage 92 is stirred in the distributor 94, and the distributor 94 and the control cage 92 are caused by centrifugal force from the opening of the rotating distributor 94. Is supplied to the gap between.
- the projection material supplied to the gap moves in the rotation direction along the inner circumferential surface of the control cage 92 and is discharged radially outward from the openings 62 and 64 of the control cage 92.
- the discharge direction of the projection material from the first opening 62 and the second opening 64 of the control cage 92 is relative to the radial direction from the rotation center of the distributor 94 (same as the rotation center C of the impeller 100 described later).
- the direction is inclined in the rotational direction of the impeller 100 (arrow R direction).
- an impeller 100 is provided outside the control cage 92.
- the impeller 100 includes 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 an interval. ing.
- a flange 82B extending radially outward from one axial end of the cylindrical portion 82A of the hub 82 is fixed to the first side plate 102A with a bolt.
- the first side plate 102A and the second side plate 102B are connected by a connecting member 102C.
- the impeller 100 further includes a plurality of blades (blades) 104 arranged so as to extend radially outward of the control cage 92 between the first side plate 102A and the second side plate 102B.
- the impeller 100 rotates in the circumferential direction of the control cage 92 by obtaining a rotational force by the operation of the drive motor 76 (FIG. 1).
- the rotation direction of the impeller 100 and the rotation direction of the distributor 94 are set in the same direction.
- Each blade is disposed along the outer periphery of the control cage 92 in an inclined direction so that the radially outer end is positioned on the rear side in the rotational direction (arrow R direction) of the impeller 100 on the outer peripheral side of the control cage 92.
- Each impeller 100 of the plurality of projectors 40 arranged side by side has a rotation axis extending in the workpiece conveyance direction, and the rotation direction is set in the same direction (clockwise direction in FIG. 6).
- the surface 106 on the front side in the rotational direction of the blade 104 is provided with a rearwardly inclined portion 110 inclined at the rear side in the rotational direction at a portion on the radially inward (base end) side.
- the rearwardly inclined portion 110 is preferably inclined rearward in the rotational direction by an angle of 30 ° to 50 ° with respect to the radial direction of the impeller 100, and is inclined 40 ° in this embodiment.
- the non-rear side extending substantially in the radial direction (in the radial line L2 direction) from the rotation center C of the impeller 100.
- An inclined portion 114 is formed.
- the non-backward tilting portion 114 is set to have an inclination angle backward in the rotational direction smaller than that of the rearward tilting portion 110.
- the radial length of the rearwardly inclined portion 110 is set to be longer than the radial length of the non-backwardly inclined portion 114.
- the rearwardly inclined portion 110 and the non-backwardly inclined portion 114 are connected by the bending portion 112.
- the roller conveyor 20 conveys the plate-shaped workpiece W in the workpiece conveyance direction (arrow D direction) as the plurality of conveyor rollers 24 rotate.
- a plurality of centrifugal projectors 40 provided above and below the roller conveyor 20 project the projection material onto the workpiece W.
- 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 region of a workpiece
- the impeller 100 arranged radially outward of the control cage 92 accelerates and projects the projection material discharged from the control cage 92 by the blade 104.
- the projection material accelerated and projected by the rotation of the impeller 100 is projected while being dispersed to some extent.
- the central axis of the control cage 92 (FIG. 5) (the axis that coincides with the rotation center C of the impeller 100) is arranged so as to face the workpiece transfer direction (arrow D direction) in plan view of the apparatus. Therefore, the projection material projected by the rotation of the impeller 100 is projected so as to diffuse in the workpiece width direction (arrow X).
- the surface 106 of the blade 104 of the impeller 100 is tilted backward with respect to the radial direction of the impeller 100 in the rotational direction (arrow R direction).
- a portion 110 is formed.
- the timing at which the projection material discharged first from the control cage 92 contacts the surface 106 of the blade 104 can be delayed.
- the projection material discharged later and the projection material discharged earlier gather at a position close to the surface 106 of the blade 104. It is done.
- the projection material can be more effectively concentrated on 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 a predetermined position in the circumferential direction of the control cage 92 becomes steep.
- the opening window 60 of the control cage 92 includes two openings, a first opening 62 and a second opening 64, which serve as a discharge portion for 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 being partially overlapped 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 arranged adjacent to.
- the projection material discharged from the first opening 62 and the second opening 64 is discharged from a position offset in the circumferential direction of the control cage 92.
- the projection distribution as a whole of the opening window is a distribution obtained by synthesizing 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.
- 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 are respectively separated.
- Each projection distribution of the discharged projection material also partially overlaps. For this reason, as a whole projection distribution, a range with a high projection ratio (a range in which projections are concentrated) is expanded.
- the projection distribution curve of the projection material suddenly rises due to the action of the backward inclined portion 110, and the projection ratio is high due to the action of the first opening 62 and the second opening 64.
- a projection distribution in which the range (the range in which the projection is concentrated) is expanded is obtained. For this reason, even if the interval in the juxtaposition direction of the projectors 40 shown in FIG.
- FIG. 8 shows a proportional shot blasting apparatus 200.
- the same components as those in the present embodiment are denoted by the same reference numerals.
- the shot blasting apparatus 200 includes six projectors 202 arranged in parallel in the direction orthogonal to the workpiece conveyance direction, that is, the workpiece width direction (arrow X direction) on the upper side of the roller conveyor 20.
- the six projectors 202 are arranged such that the rotation shaft of the impeller 204 extends in the workpiece conveyance direction as in the present embodiment.
- the blade of the impeller 204 has a surface facing the rotation direction extending in the radial direction from the rotation center.
- the control cage is formed with one rectangular opening window having two sides parallel to the cylindrical axis.
- the projection of the projection material is performed in the workpiece width direction (arrow X) as compared with the present embodiment. (Direction) is large.
- FIG. 7 is a drawing showing a projection density distribution corresponding to FIG. 6 showing a projection distribution by the shot blast processing apparatus of the present embodiment.
- FIG. 9 is a drawing showing a projection density distribution corresponding to FIG. 8 showing a projection distribution by a proportional shot blast processing apparatus.
- the projection distribution is closer to flat than in the case of comparison, and the projection unevenness as a whole is suppressed as compared with the case of comparison. I understand. For this reason, since excessive projection due to projection unevenness can be suppressed, waste of the projection material and power consumption can be suppressed.
- the inclined portion 110 is formed on the base end side of the blade 104, and the radial direction of the impeller 100 ( A non-inclined portion 114 extending in the radial line 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. Thereby, since the projection speed can be increased efficiently, it is not necessary to rotate the impeller 100 at a higher speed than necessary, and the power consumption can be suppressed.
- the length of the inclined portion 110 is set to be longer than the length of the non-inclined portion 114 when the impeller 100 is viewed in the rotational axis direction. For this reason, after the projection material is sufficiently collected by the inclined portion 110 of the blade 104, the speed of the projection material can be increased by the non-inclined portion 114.
- the first opening 62 and the second opening 64 are formed so as 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.
- the rotation direction of the impeller 100 of each of the plurality of projectors 40 arranged in parallel is set to the same direction (clockwise direction in FIG. 6). For this reason, the collision (interference) of the projection materials projected from the different impeller 100 can be suppressed.
- each impeller 100 in the plurality of projectors 40 arranged in parallel Even if the rotation direction is set to the same direction (clockwise direction in FIG. 6), the amount of projection material colliding with the inner wall side of the cabinet 12 can be suppressed.
- the shot blasting apparatus 10 of the present embodiment it is possible to satisfactorily surface-treat the workpiece W that is a plate member while suppressing the number of the projectors 40.
- the number of projectors 40 can be reduced, costs can be reduced and maintainability can be improved.
- 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.
- the first opening 62 and the second opening 64 are formed so as to be in direct contact with each other.
- the structure provided with the communication part which connects both between 1st opening and 2nd opening may be sufficient.
- the communication portion may be a linear connection between the first opening and the second opening, or may be a step connection between the first opening and the second opening.
- a control cage 92 ′ in which the first opening and the second opening are connected by a linear communication portion 63 ′ may be used (FIG. 11A).
- a control cage 92 ′′ in which the first opening and the second opening are connected by a step-like communication portion 63 ′′ may be used (FIG. 11B).
- blade is inclined 40 degrees to the back side with respect to the radial direction (radial direction line L1) of the impeller 100, and the inclination angle of the inclination part is 30.
- the angle is 50 ° to 50 °
- the inclination angle of the inclined portion may be other angles such as 25 ° and 55 ° with respect to the radial direction.
- the non-inclined part formed on the front end side of the blade surface is inclined rearward in the rotational direction, but the inclination angle is smaller than the inclination angle of the rear inclined part, the rotational direction with respect to the radial direction of the impeller
- the structure which inclines ahead may be sufficient.
- blade may be sufficient.
- the length of the inclined portion and the length of the non-inclined portion may be set to be equal when viewed from the rotation axis direction of the impeller.
- blade without a curved part may be sufficient.
- blade may be sufficient.
- the impeller may be attached to the rotation shaft of the drive motor via a hub.
- the projector 40 shown by FIG. 6 may be arrange
- positions only the leftmost projector 40 in the figure of FIG. 6 in the front and back reverse direction (so that the front side in a figure turns into a back side) may be sufficient.
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Abstract
Description
ショット処理装置であって、
間隔をおいて平行に配置された複数のローラを備え、該前記複数のローラが回転することで板状のワークを搬送方向に搬送するローラコンベヤと、
前記ローラコンベヤの上方側位置および下方側位置で前記搬送方向に交互にずれた状態で前記搬送方向に直交する方向に並列配置され、前記ローラコンベア上のワークに投射材を投射する複数の遠心式の投射機と、を備え、
前記投射機は、
円筒形状を有するコントロールケージであって、中心軸線が前記ワークの搬送方向に延びるように配置され、内部に投射材が供給され、側壁に前記投射材の排出口となる開口窓が形成されたコントロールケージと、
前記コントロールケージの外方で前記コントロールケージの径方向外方に延びるように配置された複数のブレードを備え前記コントロールケージの中心軸線を中心に回転する羽根車であって、前記ブレードの回転方向前方側の表面に、回転方向後方側に傾斜した傾斜部が設けられている羽根車と、を有し、
前記開口窓は、互いに連通した第1開口および第2開口を有し、
前記第1開口および第2開口は、二辺が前記コントロールケージの中心軸線に平行な矩形形状を有し、前記コントロールケージの中心軸方向に一部がオーバーラップした状態で前記コントロールケージの周方向にオフセットし、且つ、前記コントロールケージの中心軸線方向に隣接して配置されている、
ことを特徴とするショット処理装置が提供される。
これにより、第1開口及び第2開口からそれぞれ排出される投射材は、コントロールケージの周方向においてオフセットした位置、即ち、ずれた位置から排出される。このため、投射機全体の投射分布は、第1開口から排出された投射材の投射分布と、第2開口から排出された投射材の投射分布とを合成したものとなる。
このため、投射分布全体では、投射割合が高い範囲(投射の集中化が図られた範囲)が広げられる。この結果、投射機同士の間隔を従来よりも広く設定しても、従来と比べて同等以上のショット処理を行うことが可能となる。
前記後傾部は、前記ブレードの径方向内方側に形成され、
前記ブレードは、前記後傾部の径方向外方側に、前記後傾部より回転方向後方側への傾斜角度が小さな非後傾部を備えている。
前記後傾部の径方向長さが、前記非後傾部の径方向長さよりも長く設定されている。
前記第1開口の前記コントロールケージの中心軸方向一端側部分と、前記第2開口の前記コントロールケージの中心軸方向他端側部分とが、接合されている。
前記複数の投射機の各々の前記羽根車の回転方向は、同一方向に設定されている。
前記第1開口と第2開口とが、前記第1開口と第2開口を直線状もしくは階段状に連結する第3開口を介して連通されている。
図1は、ショットブラスト装置10の正面図であり、図2はショットブラスト装置10の平面図である。ショットブラスト装置10は、搬送経路に沿って搬送される鋼板等の板状のワークWに遠心式の投射機から投射材を投射し、ショット処理を施す装置である。
なお、図中において適宜示される矢印Dは、ワークWが搬送される方向(ワーク搬送方向)を示し、矢印Xは、ワーク搬送方向に直交する方向(ワーク幅方向)を示す。
なお、セパレータは、混合物に、他の向き、例えば横向きの気流を当てる構成を有するものでもよい。
図3は、投射機40の正面視の断面図であり、図4は、投射機40の側面視の縦断面図である。
ハブ82の円筒部82Aの軸方向一端部から半径方向外側に延びるフランジ82Bが、第1側板102Aにボルトで固定されている。第1側板102Aと第2側板102Bとは、連結部材102Cによって連結されている。
後傾部110の径方向長さは、非後傾部114の径方向長さよりも長く設定されている。また、後傾部110と非後傾部114とは、湾曲部112によって繋がれている。
次に、上記実施形態の作用及び効果について説明する。
本実施形態のショットブラスト処理装置10では、ローラコンベヤ20は、複数のコンベヤローラ24が回転することで板状のワークWをワーク搬送方向(矢印D方向)に搬送する。また、ローラコンベヤ20の上方側及び下方側に設けられた複数台の遠心式の投射機40がワークWに対して投射材を投射する。
連通部は、第1開口と第2開口とを直線的に連結するものでも、第1開口と第2開口とを階段状に連結するものでもよい。
また、ブレードの表面において傾斜部と非傾斜部とが湾曲部を介さずに連続する構成でもよい。また、ブレードの裏面の基端部に傾斜部116を設けない構成でもよい。
また、図6に示される投射機40は、表裏逆向きに(図中の表側が裏側になるように)配置されてもよい。また、図6の図中左端の投射機40のみを表裏逆向きに(図中の表側が裏側になるように)配置する構成でもよい。
20:ローラコンベヤ
24:コンベヤローラ
40:投射機
60:開口窓
62:第1開口
62X、62Y:第1開口の平行二辺
64:第2開口
64X、64Y:第2開口の平行二辺
92:コントロールケージ
92A:外周壁
100:羽根車
104:ブレード
110:傾斜部
C:羽根車の回転中心
CL:中心軸線
D:ワーク搬送方向
R:羽根車の回転方向
W:ワーク
X:ワーク幅方向
Claims (6)
- ショット処理装置であって、
間隔をおいて平行に配置された複数のローラを備え、該前記複数のローラが回転することでワークを搬送方向に搬送するローラコンベヤと、
前記ローラコンベヤの上方側位置および下方側位置で前記搬送方向に交互にずれた状態で前記搬送方向に直交する方向に並列配置され、前記ローラコンベア上のワークに投射材を投射する複数の遠心式の投射機と、を備え、
前記投射機は、
円筒形状を有するコントロールケージであって、中心軸線が前記ワークの搬送方向に延びるように配置され、内部に投射材が供給され、側壁に前記投射材の排出口となる開口窓が形成されたコントロールケージと、
前記コントロールケージの外方で前記コントロールケージの径方向外方に延びるように配置された複数のブレードを備え前記コントロールケージの中心軸線を中心に回転する羽根車であって、前記ブレードの回転方向前方側の表面に、回転方向後方側に傾斜した傾斜部が設けられている羽根車と、を有し、
前記開口窓は、互いに連通した第1開口および第2開口を有し、
前記第1開口および第2開口は、二辺が前記コントロールケージの中心軸線に平行な矩形形状を有し、前記コントロールケージの中心軸方向に一部がオーバーラップした状態で前記コントロールケージの周方向にオフセットし、且つ、前記コントロールケージの中心軸線方向に隣接して配置されている、
ことを特徴とするショット処理装置。 - 前記後傾部は、前記ブレードの径方向内方側に形成され、
前記ブレードは、前記後傾部の径方向外方側に、前記後傾部より回転方向後方側への傾斜角度が小さな非後傾部を備えている、
請求項1に記載のショット処理装置。 - 前記後傾部の径方向長さが、前記非後傾部の径方向長さよりも長く設定されている、
請求項2に記載のショット処理装置。 - 前記第1開口の前記コントロールケージの中心軸方向一端側部分と、前記第2開口の前記コントロールケージの中心軸方向他端側部分とが、接合されている、
請求項1ないし3のいずれか1項に記載のショット処理装置。 - 前記複数の投射機の各々の前記羽根車の回転方向は、同一方向に設定されている、
請求項1ないし4のいずれか1項に記載のショット処理装置。 - 前記第1開口と第2開口とが、前記第1開口と第2開口を直線状もしくは階段状に連結する第3開口を介して連通されている、
請求項1ないし5のいずれか1項に記載のショット処理装置。
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