Gear shot blasting hanger, shot blasting device and shot blasting method

Abstract

The application provides a gear shot blasting hanger, which comprises a horizontal upper supporting plate and a horizontal lower supporting plate, the upper supporting plate is connected with a hook, a circular sliding groove is arranged on the upper supporting plate and the lower supporting plate, at least three supporting columns are arranged between the upper supporting plate and the lower supporting plate, a plurality of hanging rod assemblies are arranged on each supporting column, a shot blasting channel is arranged between two adjacent supporting columns, the two ends of the supporting column pass through the sliding grooves of the upper supporting plate and the lower supporting plate and are in sliding fit with the sliding grooves, and each supporting column is connected with a driving assembly for driving the supporting column to move along the sliding groove. The application also provides a gear shot blasting device and a shot blasting method. In the whole shot blasting process, the gear only needs to be hung once, and the hanger does not need to be taken out and the gear does not need to be turned over in the middle, so that the labor intensity is reduced and the shot blasting time is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear shot blasting, in particular to a gear shot blasting hanger, a shot blasting device and a shot blasting method. BACKGROUND

[0002] After heat treatment, the gear needs to be processed by shot blasting to remove the oxide skin on the surface of the gear. At present, the shot blasting machine used for gear shot blasting is generally a rotary table type shot blasting machine, that is, a rotary table that can rotate is arranged on the top of the working cavity, and 2 to 7 shot blasters are arranged on the side wall of the working cavity. When shot blasting, the gear is hung on the hanger, which can hang a large number of gears at one time and is suitable for batch production, according to the prior art such as CN201920869411.2 and CN201820538100.3. The hanger is hung on the rotary table, and the rotary table drives the hanger to rotate, while the shot blaster blasts towards the gear, thereby removing the oxide skin on the surface of the gear. Since the oxide skin needs to be removed from both sides of the gear, but this method can only remove the oxide skin on the outside of the gear, so after a period of shot blasting, the hanger needs to be taken out, the gear is turned over and hung on the hanger again for the second shot blasting. The turning over of the gear is usually manually operated by workers, which is low in efficiency. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a gear shot blasting hanger, a shot blasting device and a shot blasting method, which can batch shot blast the gear without turning over the gear, thereby improving the production efficiency.

[0004] The technical scheme adopted by the present application to solve the technical problem is: a gear shot blasting hanger, comprising a horizontal upper support plate and a horizontal lower support plate, the upper support plate is connected with a hook, a circular sliding groove is arranged on the upper support plate and the lower support plate, at least three support columns are arranged between the upper support plate and the lower support plate, a plurality of hanger rod assemblies are arranged on each support column, a shot blasting channel is arranged between two adjacent support columns, the two ends of the support column pass through the sliding grooves of the upper support plate and the lower support plate and are in sliding fit with the sliding grooves, and a driving assembly for driving the support column to move along the sliding groove is connected to each support column.

[0005] Further, the driving assembly comprises a motor and a sliding block, the sliding block is located above the sliding groove of the upper support plate, the motor is fixedly installed on the sliding block, a transmission gear is arranged on the main shaft of the motor, the upper end of the support column is fixedly connected with the sliding block, a circular limiting cylinder is arranged on the upper support plate and the lower support plate, a gear rack is arranged on the inner side wall of the limiting cylinder, the sliding groove is located in the inner side of the limiting cylinder, and the transmission gear is engaged with the gear rack on the upper support plate, a driven gear is arranged on the lower end of the support column, the driven gear is in rotary fit with the support column, and the driven gear is engaged with the gear rack on the lower support plate.

[0006] Further, the top of the limiting cylinder is provided with a detachable cover plate, the inside of the limiting cylinder on the upper support plate is provided with a storage battery, and the motor is electrically connected with the storage battery.

[0007] Further, the upper surface of the upper support plate on the two sides of the chute is provided with a circular ring-shaped guide groove, and the lower surface of the sliding block is provided with a plurality of rollers, which are located in the guide groove and can roll along the guide groove.

[0008] Further, the hanging rod assembly comprises a plurality of horizontal rods perpendicular to the support columns, and a plurality of hanging rods are arranged on each of the horizontal rods.

[0009] The gear shot blasting device comprises a shot blasting cavity, the top of the shot blasting cavity is provided with a rotating table, and the side wall of the shot blasting cavity is provided with a shot blasting machine.

[0010] Further, the lower part of the shot blasting cavity is provided with an inclined screen, the lower end of the screen is connected with a projectile recovery mechanism, and the lower part of the screen is provided with a slag discharge port.

[0011] The gear shot blasting method comprises the following steps:

[0012] S1, hanging the gear on the hanging rod assembly, and then hanging the gear shot blasting hanger on the rotating table;

[0013] S2, the rotating table drives the gear shot blasting hanger to rotate continuously, and the shot blasting machine throws projectiles towards the gears on the gear shot blasting hanger to remove the oxide scale on the outer side of the gears;

[0014] S3, when the shot blasting channel of the gear shot blasting hanger is aligned with the shot blasting machine, the rotating table stops rotating, the projectiles thrown by the shot blasting machine pass through the shot blasting channel, and move from the inside of the gear shot blasting hanger to the gears on the support column corresponding to the shot blasting channel, to remove the oxide scale on the inner side of the gears on the support column;

[0015] S4, the driving assembly drives the support column on one side of the shot blasting channel to move into the shot blasting channel, the original position of the support column forms a new shot blasting channel, the rotating table drives the gear shot blasting hanger to rotate, so that the new shot blasting channel is aligned with the shot blasting machine, the projectiles thrown by the shot blasting machine pass through the new shot blasting channel, and move from the inside of the gear shot blasting hanger to the gears on the support column corresponding to the new shot blasting channel, to remove the oxide scale on the inner side of the gears on the support column;

[0016] S5, repeat step S4 until the oxide scale on the inner side of the gears on all support columns is removed.

[0017] Further, in steps S2 to S5, the shot and the part of the oxide skin fall on the screen under the action of gravity, the shot rolls along the screen to the shot recovery mechanism, and is re-conveyed to the shot blasting machine by the shot recovery mechanism; the oxide skin falls below the screen and is discharged through the slag discharge port.

[0018] The beneficial effects of the present application are: the present application leaves a shot blasting channel, and the shot can enter the hanger inside through the shot blasting channel during shot blasting, thereby shot blasting the inner side of the gear and removing the oxide skin on the inner side of the gear. By controlling the overall rotation of the hanger and the movement of each supporting column, the position of the shot blasting channel can be changed, so that each supporting column can reach the position opposite to the shot blasting channel, thereby realizing shot blasting of the inner side of the gear on each supporting column and ensuring that the oxide skin on the inner side of the gear is fully removed. The present application only needs to take out the gear once during the entire shot blasting process, and does not need to take out the hanger and turn over the gear in the middle, thereby reducing the labor intensity and shortening the shot blasting time. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of the gear shot blasting hanger;

[0020] Figure 2 is a top view of the upper support plate of the gear shot blasting hanger;

[0021] Figure 3 is a schematic view of the gear shot blasting device;

[0022] Figure 4 is a schematic view of the hanging rod assembly;

[0023] Figure 5 is Figure 1 is an enlarged schematic view of part A;

[0024] Fig. 1 is an upper support plate; 2 is a lower support plate; 3 is a hook; 4 is a supporting column; 5 is a rack; 6 is a sliding groove; 7 is a shot blasting channel; 8 is a limiting cylinder; 9 is a transmission gear; 10 is a motor; 11 is a sliding block; 12 is a driven gear; 13 is a cover plate; 14 is a storage battery; 15 is a cross rod; 16 is a hanging rod; 17 is a guide groove; 18 is a roller; 20 is a shot blasting cavity; 21 is a rotary table; 22 is a shot blasting machine; 23 is a screen; 24 is a slag discharge port. DETAILED DESCRIPTION

[0025] The present application will be further described below in conjunction with the drawings and examples.

[0026] The gear shot blasting device of the present application, like Figure 3As shown, the main body adopts an existing rotary table shot blasting machine. The rotary table shot blasting machine is equipped with a shot blasting chamber 20, and a turntable 21 is set on the top of the shot blasting chamber 20. The turntable 21 can rotate under the drive of a servo motor. By controlling the operating state of the servo motor, the rotation speed and rotation angle of the turntable 21 can be controlled. Shot blasters 22 are set on the side wall of the shot blasting chamber 20. The shot blasters 22 are used to throw the shot at high speed. There can be multiple shot blasters 22, which are evenly arranged in the vertical direction. The gear shot blasting device of the present invention adopts a gear shot blasting hanger. The top of the gear shot blasting hanger is equipped with a hook 3, which is hooked onto the turntable 21 during shot blasting.

[0027] In addition to the components mentioned above, shot blasting machines are also equipped with dust removal systems, shot recovery mechanisms, etc. These components are common knowledge in the field and need not be described in detail.

[0028] The gear shot blasting fixture used in this invention, such as Figure 1 , Figure 2 As shown, it includes a horizontal upper support plate 1 and a horizontal lower support plate 2. The upper support plate 1 is connected to a hook 3. Both the upper support plate 1 and the lower support plate 2 are provided with annular grooves 6. At least three support columns 4 are provided between the upper support plate 1 and the lower support plate 2. Each support column 4 is provided with multiple hanging rod assemblies. A shot blasting channel 7 is provided between two adjacent support columns 4. The two ends of the support columns 4 pass through the grooves 6 of the upper support plate 1 and the lower support plate 2 respectively and slide in cooperation with the grooves 6. Each support column 4 is connected to a drive assembly that drives the support column 4 to move along the groove 6.

[0029] The upper support plate 1 and the lower support plate 2 can be circular plates, and the hook 3 is set above the center of the upper support plate 1. The center of the slide 6 coincides with the center of the upper support plate 1 and the lower support plate 2. The depth of the slide 6 is equal to the thickness of the upper support plate 1 and the lower support plate 2, dividing the upper support plate 1 and the lower support plate 2 into two parts. Connecting rods can be used to connect the two sides of the slide 6 into a whole.

[0030] The support column 4 is used for supporting the hanger rod assembly, and the hanger rod assembly is used for supporting the gear, and the gear can be hung on the hanger rod assembly during the shot blasting. The number of the support columns 4 can be 3, 4, 5, 6 or the like, and preferably is an odd number, such as 3 or 5. The shot blasting channel 7 is arranged between two adjacent support columns 4, that is, assuming that the support columns 4 are 3, that is, support column one, support column two and support column three, the shot blasting channel 7 can be arranged between the support column one and the support column three, and the normal interval is arranged between the support column one and the support column two and between the support column two and the support column three, the size of the normal interval satisfies that the gear can cover the normal interval after being hung on the hanger rod assembly, and the width of the shot blasting channel 7 is about twice the size of the normal interval. That is, the space occupied by one support column 4 is left as the shot blasting channel 7, and the shot blasting channel 7 is used for the shot blasting, and the shot can enter the inside of the hanger through the shot blasting channel 7 to remove the oxide skin of the inside of the gear, and especially the shot can move to the inside of the gear on the support column 4 opposite to the shot blasting channel 7 to sufficiently remove the oxide skin of the inside of the gear opposite to the shot blasting channel 7.

[0031] The driving assembly drives the support column 4 to move along the sliding groove 6, the position of each support column 4 can be changed, and then the position of the shot blasting channel 7 is adjusted, so that the shot can enter the hanger from the shot blasting channel 7 at different positions, and each support column 4 can move to the opposite side of the shot blasting channel 7, so that the oxide skin of the inside of the gear on each support column 4 can be removed.

[0032] The driving assembly specifically comprises a motor 10 and a sliding block 11, the sliding block 11 is located above the sliding groove 6 of the upper support plate 1, the motor 10 is fixedly installed on the sliding block 11, a transmission gear 9 is arranged on the main shaft of the motor 10, and the upper end of the support column 4 is fixedly connected with the sliding block 11; a circular limiting cylinder 8 is arranged on the upper support plate 1 and the lower support plate 2, a gear rack 5 is arranged on the inner side wall of the limiting cylinder 8, the sliding groove 6 is located on the inner side of the limiting cylinder 8, and the transmission gear 9 is engaged with the gear rack 5 on the upper support plate 1; a driven gear 12 is arranged on the lower end of the support column 4, the driven gear 12 is rotationally connected with the support column 4, and the driven gear 12 is engaged with the gear rack 5 on the lower support plate 2.

[0033] The motor 10 is a servo motor, and the motor 10 drives the transmission gear 9 to rotate when rotating, the transmission gear 9 rolls along the gear rack 5 at the same time due to the engagement between the transmission gear 9 and the circular gear rack 5, and then the sliding block 11 slides, and the sliding block 11 drives the support column 4 to move along the sliding groove 6 due to the fixed connection between the upper end of the support column 4 and the sliding block 11, so that the position of the support column 4 is changed.

[0034] The driven gear 12 can rotate around the support column 4, and the driven gear 12 at the lower end of the support column 4 plays a positioning role with the rack 5, and the driven gear 12 rolls along the rack 5 when the support column 4 moves. The mutually meshed driven gear 12 and rack 5 have a certain positioning effect, which prevents the lower end of the support column 4 from shaking, thereby improving the stability of the support column 4 when moving.

[0035] After the pellets rebound through the gear, the pellets move randomly and may move to the motor 10, causing damage to the motor 10. In addition, during the shot blasting process, a large amount of dust is generated after the oxide skin falls off, which affects the service life of the motor 10. Therefore, a detachable cover plate 13 is arranged at the top of the limiting cylinder 8. The limiting cylinder 8 can not only be used to install the rack 5, but also plays a role in blocking the pellets. The limiting cylinder 8 and the cover plate 13 form a cavity with relatively high airtightness, which can effectively prevent the pellets from hitting the motor 10 and improve the safety of the motor 10. At the same time, the limiting cylinder 8 and the cover plate 13 can block dust to prevent a large amount of dust from reaching the motor 10 and affecting the service life of the motor 10. The cover plate 13 can be installed on the limiting cylinder 8 by screws. The upper surface of the upper support plate 1 is provided with a connecting column, and the upper end of the connecting column extends out of the cover plate 13. The hook 3 is located at the top of the connecting column.

[0036] In order to facilitate power supply to the motor 10, a battery 14 is arranged inside the limiting cylinder 8 on the upper support plate 1, and the motor 10 is electrically connected with the battery 14. The battery 14 can be a commonly used lithium battery. In addition, a PLC or the like can also be arranged inside the limiting cylinder 8 for controlling the operation of the motor 10.

[0037] Generally, dozens of gears are arranged on each support column 4, which results in a relatively large weight of each support column 4 and a relatively large load of the motor 10. In order to reduce the load of the motor 10 and improve the endurance, as shown in Figure 5 The upper surface of the upper support plate 1 on both sides of the chute 6 is provided with a circular guide groove 17, and the lower surface of the sliding block 11 is provided with a plurality of rollers 18. The rollers 18 are located in the guide groove 17 and can roll along the guide groove 17. When the sliding block 11 moves, the rollers 18 roll in the guide groove 17, and the rolling friction is smaller, which can more labor-savingly drive the sliding block 11 to move.

[0038] The hanging rod assembly of the present application, as shown in Figure 4 includes a plurality of cross rods 15 perpendicular to the support column 4, and a plurality of hanging rods 16 are arranged on each cross rod 15. The end of each hanging rod 16 is provided with an anti-falling boss to prevent the gear from falling off. One gear can be hung on each hanging rod 16, and the number and spacing of the cross rods 15 and the hanging rods 16 are determined according to the size of the gear.

[0039] The upper support plate 1, the lower support plate 2, the hook 3, the support column 4 and the hanging rod assembly of the gear shot blasting hanger are all made of high-strength wear-resistant material, such as wear-resistant stainless steel, so as to improve the service life.

[0040] After the oxide skin is removed from the gear, small particles become dust and are removed through the dust removal system, and large particles of the oxide skin fall to the bottom of the shot blasting chamber 20 and are mixed with the shot, which is not conducive to the recovery of the shot, therefore, the present application is provided with an inclined screen 23 at the lower part of the shot blasting chamber 20 of the gear shot blasting device, the lower end of the screen 23 is connected with a shot recovery mechanism, and a slag discharge port 24 is arranged below the screen 23. The mesh diameter of the screen 23 is smaller than the diameter of the shot, so that the shot and the oxide skin can be screened, the shot is rolled along the screen 23 to the shot recovery mechanism, and the shot is recovered and conveyed to the shot blaster 22 by the shot recovery mechanism.

[0041] The gear shot blasting method of the present application comprises the following steps:

[0042] S1, the gear is hung on the hanging rod assembly, and then the gear shot blasting hanger is hung on the rotary table 21. Specifically, one gear is hung on each hanging rod 16, the side of the gear facing the center of the hanger is the inner side, and the side facing the outside is the outer side. After the gear is hung, the gear shot blasting hanger is hung on the rotary table 21 through the hook 3, and the door of the shot blasting chamber 20 is closed.

[0043] S2, the rotary table 21 drives the gear shot blasting hanger to rotate slowly and continuously, while the shot blaster 22 throws the shot towards the gears on the gear shot blasting hanger, the shot hits the outer side of the gears, and the oxide skin on the outer side of the gears is removed.

[0044] S3, when the shot blasting channel 7 of the gear shot blasting hanger is aligned with the shot blaster 22, the rotary table 21 stops rotating, the shot thrown by the shot blaster 22 passes through the shot blasting channel 7 and moves from the inside of the gear shot blasting hanger to the gear on the support column 4 corresponding to the shot blasting channel 7, and the oxide skin on the inner side of the gear on the support column 4 is removed. Compared with step S2, the movement distance of the shot is longer and the speed attenuation is greater at this time, so the speed of the shot thrown by the shot blaster 22 can be appropriately increased when removing the oxide skin on the inner side of the gear.

[0045] S4, after the oxide skin on the gear on the support column 4 opposite to the shot blasting channel 7 is removed, the support column 4 on one side of the shot blasting channel 7 is driven to move into the shot blasting channel 7 by the driving assembly, the original position of the support column 4 forms a new shot blasting channel 7, the rotary table 21 drives the gear shot blasting hanger to rotate, the new shot blasting channel 7 is aligned with the shot blaster 22, the shot thrown by the shot blaster 22 passes through the new shot blasting channel 7 and moves from the inside of the gear shot blasting hanger to the gear on the support column 4 corresponding to the new shot blasting channel 7, and the oxide skin on the inner side of the gear on the support column 4 is removed.

[0046] S5, repeating step S4 until the oxide scale of the inner side surface of the gear on all support columns 4 is removed.

[0047] With the above-mentioned shot blasting method, the shot blasting of the two side surfaces of the gear can be completed by hanging the gear once, without the need to take out the gear shot blasting hanger and turn over the gear in the middle, which can improve the processing efficiency. In addition, the movement of the support column 4 and the rotation of the entire gear shot blasting hanger can be automatically controlled, without manual operation, which reduces the labor intensity.

[0048] In the above-mentioned shot blasting method, the order of steps S2 and S3 to S5 can be changed. That is, after step S1, step S2 can be performed first, and then steps S3 to S5 can be performed, or steps S3 to S5 can be performed first, and then step S2 can be performed, that is, the oxide scale of the inner side surface of the gear is removed first, and then the oxide scale of the outer side surface of the gear is removed. Since part of the oxide scale of the outer side surface of the gear can be removed when removing the oxide scale of the inner side surface of the gear, performing steps S3 to S5 first and then performing step S2 can save shot blasting time.

[0049] During the shot blasting process, the pellets and part of the oxide scale fall on the screen 23 under the action of gravity, the pellets roll along the screen 23 to the pellet recycling mechanism, and are re-conveyed to the shot blaster 22 by the pellet recycling mechanism; the oxide scale falls below the screen 23 and is discharged through the slag discharge port 24, and a collection bag or a collection box can be provided at the slag discharge port 24 for collecting the oxide scale.

[0050] The present application can remove the oxide scale of the two side surfaces of the gear at one time, without the need for manual turning over of the gear, thus reducing the labor intensity of the workers and improving the shot blasting efficiency, and a plurality of gears can be shot blasted at one time, which can be used for batch production of gears.

[0051] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A gear shot blasting method, characterized in that: A gear shot blasting device is used, which includes a shot blasting chamber (20). A turntable (21) is provided on the top of the shot blasting chamber (20). A shot blaster (22) is provided on the side wall of the shot blasting chamber (20). A gear shot blasting hanger is provided on the turntable (21). The gear shot blasting hanger includes a horizontal upper support plate (1) and a horizontal lower support plate (2). A hook (3) is connected to the upper support plate (1). Both the upper support plate (1) and the lower support plate (2) are provided with annular grooves (6). (2) At least three support columns (4) are provided between them. Each support column (4) is provided with multiple hanging rod assemblies. A shot blasting channel (7) is provided between two adjacent support columns (4). The two ends of the support column (4) pass through the sliding grooves (6) of the upper support plate (1) and the lower support plate (2) respectively and slide with the sliding grooves (6). Each support column (4) is connected to a drive assembly that drives the support column (4) to move along the sliding groove (6). The hook (3) of the gear shot blasting hanger is attached to the turntable (21). The shot blasting process includes: S1. Hang the gear on the hanging rod assembly, and then hang the gear shot blasting fixture on the turntable (21); S2. The turntable (21) drives the gear shot blasting fixture to rotate continuously, while the shot blaster (22) throws shot at the gear on the gear shot blasting fixture to remove the oxide scale on the outer side of the gear. S3. When the shot blasting channel (7) of the gear shot blasting fixture is aligned with the shot blaster (22), the turntable (21) stops rotating. The shot thrown by the shot blaster (22) passes through the shot blasting channel (7) and moves from inside the gear shot blasting fixture to the gear on the support column (4) corresponding to the shot blasting channel (7), removing the oxide scale on the inner side of the gear on the support column (4). S4. Using the drive assembly, the support column (4) on one side of the shot blasting channel (7) is moved into the shot blasting channel (7). The original position of the support column (4) forms a new shot blasting channel (7). The turntable (21) drives the gear shot blasting fixture to rotate, so that the new shot blasting channel (7) is aligned with the shot blaster (22). The shot thrown by the shot blaster (22) passes through the new shot blasting channel (7) and moves from inside the gear shot blasting fixture to the gear on the support column (4) corresponding to the new shot blasting channel (7), removing the oxide scale on the inner side of the gear on the support column (4). S5. Repeat step S4 until the oxide scale on the inner side of the gears on all support columns (4) is removed. The order of steps S3 to S5 can be interchanged with that of step S2.

2. The gear shot blasting method as described in claim 1, characterized in that: The driving assembly includes a motor (10) and a slider (11). The slider (11) is located above the groove (6) of the upper support plate (1). The motor (10) is fixedly installed on the slider (11), and a transmission gear (9) is provided on the main shaft of the motor (10). The upper end of the support column (4) is fixedly connected to the slider (11). Both the upper support plate (1) and the lower support plate (2) are provided with annular limiting cylinders (8). A rack (5) is provided on the inner side wall of the limiting cylinder (8). The groove (6) is located inside the limiting cylinder (8), and the transmission gear (9) meshes with the rack (5) on the upper support plate (1). The lower end of the support column (4) is provided with a driven gear (12). The driven gear (12) rotates with the support column (4), and the driven gear (12) meshes with the rack (5) on the lower support plate (2).

3. The gear shot blasting method as described in claim 2, characterized in that: The top of the limiting cylinder (8) is provided with a detachable cover plate (13), and the limiting cylinder (8) on the upper support plate (1) is provided with a storage battery (14). The motor (10) is electrically connected to the storage battery (14).

4. The gear shot blasting method as described in claim 2, characterized in that: The upper surface of the upper support plate (1) on both sides of the slide (6) is provided with an annular guide groove (17), and the lower surface of the slider (11) is provided with multiple rollers (18). The rollers (18) are located in the guide groove (17) and can roll along the guide groove (17).

5. The gear shot blasting method as described in claim 1, characterized in that: The hanging rod assembly includes multiple horizontal bars (15) perpendicular to the supporting column (4), and each horizontal bar (15) is provided with multiple hanging rods (16).

6. The gear shot blasting method as described in claim 1, characterized in that: An inclined screen (23) is provided at the lower part of the shot blasting chamber (20), and a shot recovery mechanism is connected to the lower end of the screen (23). A slag discharge port (24) is provided below the screen (23). In steps S2 to S5, the shot and some of the oxide scale fall onto the screen (23) under the action of gravity. The shot rolls along the screen (23) to the shot recovery mechanism and is then transported back to the shot blaster (22) by the shot recovery mechanism. The oxide scale falls below the screen (23) and is discharged through the slag discharge port (24).

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