WO2012086234A1

WO2012086234A1 - Abrasive blasting device

Info

Publication number: WO2012086234A1
Application number: PCT/JP2011/063547
Authority: WO
Inventors: 万俊山本
Original assignee: 新東工業株式会社
Priority date: 2010-12-24
Filing date: 2011-06-14
Publication date: 2012-06-28
Also published as: JP2014039962A; CN102917840A

Abstract

A projection material is prevented from coming out of a workpiece transferring outlet, a sealing member for sealing between a door and the workpiece transferring outlet is prevented from wearing off, and the configuration is simplified. In an abrasive blasting device (10), a drum (16) rotates by means of a rotation driving unit (18) with the vertical direction functioning as the rotation axis. When the drum (16) is positioned in the projection position, the opening (16A) of the drum (16) faces a different direction from a workpiece transfer outlet (28). Therefore, even when a projection material is projected into the drum (16) through the opening (16A) while the drum (16) is positioned in the projection position, it is possible to prevent the projection material from being projected to the side of the workpiece transfer outlet (28). As a consequence, even when a door (14) is opened after processing a workpiece, it is possible to prevent the projection material from coming out of the workpiece transfer outlet (28) and to prevent a sealing member for sealing between the door (14) and the workpiece transfer outlet (28) from wearing off. Moreover, the configuration can be simplified because there is no longer the need for a liner for protecting the door (14).

Description

Shot processing device

The present invention relates to a shot processing apparatus.

2. Description of the Related Art Conventionally, a shot blasting device having a rotating drum that agitates and overturns a workpiece that has been rotated around a central axis and placed inside is known (for example, see Patent Document 1).

Patent Document 1: Japanese Patent Publication No. 61-47667

However, in this type of shot blasting apparatus, when the rotating drum is accommodated in a cabinet and a door for opening and closing a work loading / unloading port formed in the cabinet is provided, there are the following problems.

That is, when the door is opened after the processing of the workpiece is completed, the projection material comes out from the workpiece loading / unloading port, or the projection material is projected onto the sealing material that seals between the door and the workpiece loading / unloading port to seal The material may be worn out. Moreover, a liner for protecting the door from the projection material projected from the projection unit is required, and the structure becomes complicated.

The present invention has been made in view of the above problems, and an object thereof is to provide a shot processing apparatus that can solve the above problems.

In order to solve the above problems, a shot processing apparatus according to a first aspect of the present invention includes a cabinet having a side wall portion in which a workpiece loading / unloading port for loading / unloading a workpiece is formed, and a door for opening / closing the workpiece loading / unloading port. And a drum with a bottom having an opening, and a drum housed in the cabinet, with the vertical direction as a pivot axis, the drum, and a workpiece loading / unloading position where the opening faces the workpiece loading / unloading port, A turning drive unit for turning the opening to a projection position facing a direction different from the workpiece loading / unloading port, a projection unit for projecting a projection material into the drum through the opening when the drum is at the projection position, and It has.

According to this shot processing apparatus, the drum is swung by the swivel drive unit with the vertical direction as the swivel axis, and when the drum is at the projection position, the opening of the drum is in a direction different from the work loading / unloading port. Directed. Therefore, even when the projection material is projected into the drum through the opening of the drum in a state where the drum is at the projection position, the projection material can be prevented from being projected to the workpiece loading / unloading side.

As a result, even if the door is opened after the processing of the workpiece is completed, the projection material may come out from the workpiece loading / unloading port, or the sealing material that seals between the door and the workpiece loading / unloading port may be worn out. Can be suppressed. Further, the liner for protecting the door is not necessary, and the structure can be simplified.

The shot processing apparatus of the invention according to a second aspect is the shot processing apparatus of the invention according to the first aspect, wherein the projection position is set to a position where the drum is turned 90 degrees with respect to the work loading / unloading position. It is the structure which was made.

According to this shot processing apparatus, since the projection position is set at a position where the drum is turned 90 degrees with respect to the workpiece loading / unloading position, the projection material is further suppressed from being projected to the workpiece loading / unloading side. can do.

The shot processing apparatus of the invention according to the third aspect is the shot processing apparatus of the invention according to the first or second aspect, wherein the opening faces upward from the horizontal direction when the drum is at the projection position. A swing drive unit that drives the drum so that it swings in the up-down direction, and a rotational drive that rotates the drum around the center axis of the bottomed cylindrical body when the drum is at the projection position And a part.

According to this shot processing apparatus, when the drum is at the projection position, the drum is swung in the vertical direction with the drum opening facing upward from the horizontal direction, and the drum is centered on the bottomed cylindrical body. It is rotated around the axis. Accordingly, since the work in the drum can be stirred and overturned, the work can be finished uniformly.

The shot processing apparatus of the invention according to a fourth aspect is the shot processing apparatus of the invention according to the third aspect, wherein the swing drive unit is configured such that when the drum is in the workpiece loading / unloading position, When the drum is in the workpiece unloading posture, the end of the drum on the opening side is closer to the cabinet than the workpiece loading / unloading port. It is set as the structure protruded outside.

According to this shot processing apparatus, when the drum is in the workpiece loading / unloading position, the drum can be set in the workpiece loading posture such that the opening of the drum faces downward from the horizontal direction. Thereby, since the workpiece | work in a drum can be moved to the opening side of a drum, workability | operativity at the time of workpiece | work carrying-out can be made favorable.

Furthermore, when this drum is in the workpiece carry-out posture, the end of the drum on the opening side protrudes outside the cabinet from the workpiece carry-in / out port. Therefore, the workability at the time of unloading the workpiece can be improved, and the workpiece can be prevented from falling inside the cabinet at the time of unloading the workpiece.

The shot processing apparatus of the invention according to the fifth and sixth aspects is the shot processing apparatus of the invention according to the third or fourth aspect, respectively, and extends toward the inner peripheral surface of the drum toward the bottom side of the drum When the spiral projection is formed and the rotation driving unit rotates the drum so that the workpiece advances to the bottom side of the drum by the spiral projection when the drum is at the projection position, the drum is When the workpiece is in the workpiece carry-out posture, the drum is rotated so that the workpiece advances toward the opening side of the drum by a spiral protrusion.

According to this shot processing apparatus, the protrusion is formed in a spiral shape toward the bottom side of the drum. However, when the drum is at the projection position, the workpiece is advanced to the bottom side of the drum by the spiral protrusion. Since the drum is rotated, the workpiece can be moved to the bottom side of the drum. Thereby, the work can be rebounded at the bottom, and the work can be stirred and overturned more effectively.

On the other hand, when the drum is in the workpiece carry-out posture, the drum is rotated so that the workpiece advances toward the opening side of the drum by the spiral projection, so that the workpiece can be moved to the opening side of the drum. Thereby, workability | operativity at the time of workpiece | work carrying-out can be improved.

[The invention's effect]

As described above in detail, according to the present invention, even if the door is opened after the processing of the workpiece is completed, the projection material may come out from the workpiece loading / unloading port or seal between the door and the workpiece loading / unloading port. It can suppress that the sealing material which wears wears. Further, the liner for protecting the door is not necessary, and the structure can be simplified.

It is a front view of a shot processing device concerning one embodiment of the present invention. It is a side view of the shot processing apparatus shown by FIG. It is a top view of the shot processing apparatus shown by FIG. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from the front. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from the front. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from the side. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from upper direction. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from the front. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from the side. It is sectional drawing which looked at the shot processing apparatus shown by FIG. 1 from upper direction. It is sectional drawing of the drum shown by FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

A shot processing apparatus 10 according to an embodiment of the present invention shown in FIGS. 1 to 11 is suitably used as, for example, a shot blasting apparatus, and includes a cabinet 12, a pair of doors 14, a drum 16, A turning drive unit 18, a swing drive unit 20, a rotation drive unit 22, a projection unit 24, and a control panel 26 are provided as main components.

As shown in FIG. 1, the cabinet 12 is formed in a box shape. A workpiece loading / unloading port 28 for loading and unloading a workpiece is formed in the sidewall portion 12A located in front of the plurality of sidewall portions formed in the cabinet 12. In addition, an inclined portion 12D that is inclined with respect to the vertical direction is formed at the upper portion of the side wall portion 12B located on the side surface of the cabinet 12 so as to go to the opposite side wall portion 12C as it goes upward.

The pair of doors 14 are provided at the center of the side wall portion 12A, and open and close the workpiece loading / unloading port 28. A bracket 30 is attached to the pair of doors 14 as shown in FIGS. A connecting portion 32 is connected to the bracket 30, and an open / close drive chain 34 is connected to the connecting portion 32. The open / close drive chain 34 is wound around a drive wheel 36 and a driven wheel 38, and the drive wheel 36 is fixed to the drive shaft of the open / close drive motor 40.

When the opening / closing drive motor 40 is rotated forward and backward, this rotational force is transmitted to the pair of doors 14 via the drive wheel 36 and the opening / closing drive chain 34, and the pair of doors 14 is opened / closed.

As shown in FIGS. 5 to 7, the drum 16 is formed in a bottomed cylindrical shape having an opening 16A and is accommodated in the cabinet 12. As shown in FIG. 11, a spiral (thread-like) protrusion 42 extending toward the bottom 16 C side of the drum 16 is formed on the inner peripheral surface 16 B of the drum 16.

The turning drive unit 18 includes a turning drive motor 44, a turning drive link 46, a turning shaft 48, and a frame 50, as shown in FIGS. The turning drive motor 44 is attached to the upper wall portion 12E of the cabinet 12, and the turning drive link 46 connects the output shaft of the turning drive motor 44 and the upper end of the turning shaft 48.

The turning shaft 48 extends in the vertical direction and is rotatably supported by the upper wall portion 12E of the cabinet 12. The lower end side of the turning shaft 48 passes through the upper wall portion 12 E of the cabinet 12 and is positioned inside the cabinet 12.

The frame 50 is fixed to the lower end of the turning shaft 48 and has a base portion 50A extending in the horizontal direction and a pair of arm portions 50B extending downward from both ends of the base portion 50A. As will be described later, the drum 16 is fixed to the pair of arm portions 50B via the swing arm 54 and the rotation drive unit 22.

When the turning drive motor 44 is rotated forward and backward, the turning drive link 46 is operated, and the drum 16 is turned together with the frame 50, the swing arm 54, and the rotation drive unit 22 with the vertical direction as the turning axis. The Further, here, as an example, the drum 16 has a workpiece loading / unloading position P1, P5 in which the opening 16A faces the workpiece loading / unloading port 28, and a direction in which the opening 16A is different from the workpiece loading / unloading port 28 (that is, a projection unit 24 side described later ) To the projection positions P2 to P4. The projection positions P2 to P4 are set at positions where the drum 16 is turned 90 degrees with respect to the work loading / unloading positions P1 and P5.

The swing drive unit 20 is attached to the frame 50. The swing drive unit 20 includes a swing drive cylinder 52 and a swing arm 54. As shown in FIG. 4, the oscillating drive cylinder 52 has a cylinder body 52A fixed to the frame 50, and a drive shaft 52B that protrudes and is immersed in the cylinder body 52A.

As shown in FIG. 5, the swing arm 54 has a base portion 54A disposed between the pair of arm portions 50B and a pair of connecting portions 54B extending downward from both sides of the base portion 54A. . The drum 16 is fixed to the base 54A via a rotation driving unit 22 described later. The pair of connecting portions 54B are rotatably connected to the pair of arm portions 50B by swinging shafts 56 extending in the horizontal direction. Further, one of the pair of connecting portions 54B is connected to the tip of the drive shaft 52B at a position shifted downward from the swing shaft 56.

Then, when the drive shaft 52B protrudes and immerses with respect to the cylinder body 52A shown in FIG. 4, the rotary drive unit 22 and the drum 16 swing together with the frame 50. Here, as an example, the swing angle of the drum 16 is set in a range of −10 degrees to 35 degrees with respect to the horizontal direction.

Further, as will be described later, when the drum 16 is in a workpiece loading / unloading position in which the opening 16A faces the workpiece loading / unloading port 28, the drum 16 can take a workpiece unloading posture P5 in which the opening 16A faces downward from the horizontal direction. In some cases, the relative position between the drum 16 and the workpiece loading / unloading port 28 is set so that the end of the drum 16 on the opening 16A side protrudes outside the cabinet 12 from the workpiece loading / unloading port 28.

The rotation drive unit 22 includes a rotation drive motor 58, a drive wheel 60, a driven wheel 62, and a rotation drive chain 64. The rotation drive motor 58 is attached to the swing arm 54, and the rotation drive wheel 60 is fixed to the drive shaft of the rotation drive motor 58. The driven wheel 62 is attached to the bottom of the drum 16 and coaxially with the rotation axis of the drum 16, and the rotary drive chain 64 is wound around the drive wheel 60 and the driven wheel 62.

When the rotational drive motor 58 is rotated forward and backward, this rotational force is transmitted to the drum 16 via the drive wheel 60, the rotational drive chain 64, and the driven wheel 62, and the drum 16 is moved around the center axis of the bottomed cylindrical body. It will be reversed.

The projection unit 24 is, for example, a centrifugal projection device, and is attached to an inclined portion 12D formed on the side wall portion 12B of the cabinet 12 as shown in FIG. The projection unit 24 projects a projection material into the drum 16 through the opening 16A of the drum 16 when the drum 16 is at the projection positions P2 to P4.

The control panel 26 is electrically connected to the opening / closing drive motor 40, the turning drive motor 44, the swing drive cylinder 52, the rotation drive motor 58, and the like described above. The control panel 26 stores a program for driving the opening / closing drive motor 40, the turning drive motor 44, the swing drive cylinder 52, and the rotation drive motor 58. The control panel 26 executes a program in accordance with the operation of the operator, and drives the opening / closing drive motor 40, the turning drive motor 44, the swing drive cylinder 52, and the rotation drive motor 58, as will be described in detail later.

Next, the operation of the above shot processing apparatus 10 will be described.

First, when a workpiece is carried into the drum 16, the pair of doors 14 are opened, and the drum 16 is positioned at the workpiece loading / unloading position so that the opening 16A of the drum 16 faces the workpiece loading / unloading port 28. At this time, the drum 16 is in a workpiece loading posture P1 in which the opening 16A faces upward from the horizontal direction. Here, as an example, when the entire drum 16 is made of iron, the drum 16 is inclined by 25 degrees so that the opening 16A faces upward with respect to the horizontal direction. On the other hand, when a rubber material is affixed to the inner peripheral surface 16B of the drum 16, the drum 16 is inclined 30 degrees so that the opening 16A faces upward with respect to the horizontal direction during loading.

When the workpiece is automatically loaded into the drum 16 by the automatic loading device, the drum 16 may be rotated by driving the rotation drive motor 58. Thereby, the work in the drum 16 may be moved to the bottom 16C side of the drum 16. On the other hand, when the work is manually carried into the drum 16 by the operator, it is desirable to keep the drum 16 stopped.

When the work is carried into the drum 16, the turning drive motor 44 is rotated forward, the drum 16 is turned 90 degrees with respect to the work carry-in / out position P1, and the projection position P2 in which the opening 16A faces the projection unit 24 side. Located in. In addition, the opening / closing drive motor 40 is rotated forward to close the pair of doors 14.

Subsequently, when the drum 16 is positioned at the projection position P2, the swing drive cylinder 52 is operated, and the drive shaft 52B is repeatedly protruded and immersed in the cylinder body 52A. At this time, the drum 16 is swung so as to move up and down with the opening 16A facing upward from the horizontal direction. That is, the posture of the drum 16 is changed from P2 to P4. Here, as an example, the drum 16 is swung in a range of 25 to 35 degrees with respect to the horizontal direction. Then, the workpiece in the drum 16 is stirred and overturned by swinging the drum 16 in this way.

Further, when the drum 16 is swung at the projection position as described above, the rotation drive motor 58 is rotated forward, and the drum 16 is rotated around the center axis of the bottomed cylindrical body. Then, by rotating the drum 16 in this way, the work in the drum 16 is moved to the bottom 16C side of the drum 16 by the spiral protrusion 42. Further, the workpiece moved to the bottom 16C side of the drum 16 is bounced back at the bottom 16C of the drum 16, and is stirred and overturned.

Further, at the same time as the drum 16 is swung and rotated as described above, the projection unit 24 is operated, and the projection material is projected into the drum 16 through the opening 16A of the drum 16. As a result, the projection material is projected onto the workpiece in the drum 16 and the workpiece is subjected to a polishing process.

Subsequently, when the workpiece polishing process is completed, the swing drive cylinder 52 and the rotation drive motor 58 are stopped. At this time, the drum 16 is in an upward posture P2 in which the opening 16A faces upward from the horizontal direction. Further, the opening / closing drive motor 40 is reversed to open the pair of doors 14.

Then, the turning drive motor 44 is reversed, the drum 16 is turned 90 degrees with respect to the projection position P2, and is positioned at the workpiece loading / unloading position P1 facing the workpiece loading / unloading port 28 side.

Subsequently, when the drum 16 is positioned at the workpiece loading / unloading position P1 as described above, the swing drive cylinder 52 is operated. As a result, the drum 16 is brought into a workpiece carry-out posture P5 in which the opening 16A faces downward from the horizontal direction. Here, as an example, the drum 16 is tilted by −10 degrees so that the opening 16A faces downward with respect to the horizontal direction. At this time, the end of the drum 16 on the opening 16 A side protrudes outside the cabinet 12 from the work loading / unloading port 28.

Further, when the drum 16 is brought into the workpiece carry-out posture P5, the rotation drive motor 58 is reversed and the drum 16 is rotated in the reverse direction. As a result, the work in the drum 16 is moved toward the opening 16A of the drum 16 by the spiral protrusion 42.

Then, when the work in the drum 16 is carried out, a series of work is completed.

Note that the projection material is circulated as follows. That is, the projection material falls from the punched hole formed in the drum 16 and flows to the lower screw conveyor 70 by the hopper provided in the lower part of the cabinet 12. Then, the projection material conveyed from the lower screw conveyor 70 is sent to the vertical screw conveyor 72 and is lifted and conveyed to the separator 74.

Further, only the usable projection material selected by the separator 74 flows again to the projection unit 24 through the introduction pipe 76. On the other hand, air and dust sucked by the separator 74 are classified by the cyclone 78. Usable projectiles selected by the cyclone 78 are returned to the cabinet 12. The air and dust flowing from the cyclone 78 are separated by a dust collector, and only the air is exhausted to the outside air. The dust is collected and discarded.

Next, the operation and effect of one embodiment of the present invention will be described.

As described above in detail, according to the shot processing apparatus 10 according to an embodiment of the present invention, the drum 16 is swung by the swivel drive unit 18 with the vertical direction as the swivel axis. When in the projection position, the opening 16 A of the drum 16 is directed toward the projection unit 24, which is in a direction different from the work loading / unloading port 28. Therefore, even when the projection material is projected into the drum 16 through the opening 16A of the drum 16 in a state where the drum 16 is at the projection position, the projection material can be prevented from being projected to the workpiece loading / unloading port 28 side. .

Thus, even when the pair of doors 14 is opened after the workpiece processing is completed, the projection material comes out from the workpiece loading / unloading port 28 or seals between the pair of doors 14 and the workpiece loading / unloading port 28. It is possible to suppress wear of the material. Further, a liner for protecting the pair of doors 14 is not necessary, and the structure can be simplified.

Moreover, since the above-described projection position is set to a position where the drum 16 is turned 90 degrees with respect to the workpiece loading / unloading position, the projection material is further suppressed from being projected to the workpiece loading / unloading port 28 side. Can do.

When the drum 16 is in the projection position, the drum 16 is swung up and down with the opening 16A of the drum 16 facing upward from the horizontal direction, and the drum 16 is rotated forward about the center axis of the bottomed cylindrical body. Is done. Accordingly, the work in the drum 16 can be stirred and overturned, so that the work can be finished uniformly.

In particular, when the drum 16 is in the projection position, the drum 16 is normally rotated around the center axis of the bottomed cylindrical body, so that the workpiece is drummed by the spiral protrusion 42 formed on the inner peripheral surface 16B of the drum 16. 16 can be moved to the bottom 16C side. Thereby, the work can be rebounded at the bottom portion 16C, and the work can be stirred and overturned more effectively.

On the other hand, when the drum 16 is in the workpiece loading / unloading position, the drum 16 can be in the workpiece loading posture so that the opening 16A of the drum 16 faces downward from the horizontal direction. Thereby, since the workpiece | work in the drum 16 can be moved to the opening 16A side, workability | operativity at the time of workpiece | work carrying-out can be made favorable.

In addition, when the drum 16 is in the workpiece carry-out posture, the drum 16 is rotated in the reverse direction around the center axis of the bottomed cylindrical body, so that the workpiece is moved by the spiral protrusion 42 formed on the inner peripheral surface 16B of the drum 16. The drum 16 can be moved toward the opening 16A. Thereby, workability | operativity at the time of workpiece | work carrying-out can be improved.

Also, when the drum 16 is in the workpiece carry-out posture, the end on the opening 16A side protrudes outside the cabinet 12 from the workpiece loading / unloading port 28. Therefore, the workability at the time of unloading the workpiece can be improved, and the workpiece can be prevented from falling inside the cabinet 12 at the time of unloading the workpiece.

Next, a modification of one embodiment of the present invention will be described.

In one embodiment of the present invention, the swing drive unit 20 includes the swing drive cylinder 52, but includes a drive motor that is directly connected to the swing shaft 56 instead of the swing drive cylinder 52. May be.

Further, although the turning drive unit 18 includes the turning drive motor 44 and the turning drive link 46, instead of these, a turning motor may be provided that is directly connected to the turning shaft 48.

Further, the rotary drive unit 22 was provided with a rotary drive motor 58, a drive wheel 60, a driven wheel 62, and a rotary drive chain 64. Instead, these were directly connected to the rotary shaft of the drum 16. A drive motor may be provided.

Further, the shot processing apparatus 10 may be used not only for shot blast processing but also for shot peening processing.

Further, the projection unit 24 may be an air projection device instead of a centrifugal projection device.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and other various modifications can be made without departing from the spirit of the present invention. It is.

DESCRIPTION OF SYMBOLS 10 Shot processing apparatus 12 Cabinet 14 Door 16 Drum 16A Opening 16B Inner peripheral surface 16C Bottom part 18 Swiveling drive part 20 Swing drive part 22 Rotation drive part 24 Projection unit 28 Work carrying in / out opening 42 Spiral protrusion

Claims

A cabinet having a side wall portion in which a workpiece loading / unloading port for loading and unloading a workpiece is formed;
A door for opening and closing the workpiece loading / unloading port;
A drum having a bottom and having an opening, and a drum housed in the cabinet;
With the vertical direction as a turning axis, a turning drive unit for turning the drum to a work loading / unloading position where the opening faces the work loading / unloading position and a projection position where the opening faces a direction different from the work loading / unloading position;
A projection unit that projects a projection material into the drum through the opening when the drum is in the projection position;
A shot processing apparatus comprising:
The projection position is set to a position where the drum is turned 90 degrees with respect to the work loading / unloading position.
The shot processing apparatus according to claim 1.
A swing drive unit for driving the drum so that the opening swings in the vertical direction with the opening facing upward from the horizontal direction when the drum is in the projection position;
A rotation drive unit that rotates the drum around the center axis of the bottomed cylindrical body when the drum is at the projection position;
The shot processing apparatus of Claim 1 or Claim 2 provided with these.
When the drum is in the workpiece loading / unloading position, the swing driving unit can cause the drum to be in a workpiece unloading posture in which the opening faces downward from the horizontal direction.
When the drum is in the workpiece unloading posture, an end portion on the opening side of the drum is projected to the outside of the cabinet from the workpiece loading / unloading port.
The shot processing apparatus according to claim 3.
A spiral protrusion extending toward the bottom side of the drum is formed on the inner peripheral surface of the drum,
When the drum is in the projection position, the rotation driving unit rotates the drum so that the workpiece advances to the bottom side of the drum by a spiral protrusion, and when the drum is in the workpiece discharge posture, The drum is rotated so that it advances to the opening side of the drum by a spiral projection,
The shot processing apparatus according to claim 3.
A spiral protrusion extending toward the bottom side of the drum is formed on the inner peripheral surface of the drum,
When the drum is in the projection position, the rotation driving unit rotates the drum so that the workpiece advances to the bottom side of the drum by a spiral protrusion, and when the drum is in the workpiece discharge posture, The drum is rotated so that it advances to the opening side of the drum by a spiral projection,
The shot processing apparatus according to claim 4.