A screening device and screening method for hardware intelligent manufacturing

CN115591769BActive Publication Date: 2026-06-12ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Filing Date
2022-11-08
Publication Date
2026-06-12

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Abstract

The application relates to a screening device for intelligent manufacturing of hardware, which comprises a base, a plurality of first springs are fixedly connected to the inner wall of the bottom of the base, a same box body is fixedly connected to the top of the plurality of first springs, a groove is formed in the bottom of the box body, a fixing seat is fixedly connected to the inner wall of one end of the groove, a motor is fixedly connected to the other end of the fixing seat, a connecting shaft is connected to the output shaft of the motor, an eccentric wheel is fixedly sleeved on the connecting shaft, a separation groove is formed in the top of the box body, a first opening is formed in the two sides of the separation groove, a same screen plate is inserted between the two first openings, a side plate is fixedly connected to the bottom of the two sides of the screen plate, two second springs are fixedly connected to the inner side of the side plate, a first lug is fixedly connected to the outer wall of one side of the box body, a first shaft rod is rotatably connected to the first lug, and a striking rod is fixedly sleeved on the top of the first shaft rod; the screen plate is used for reciprocating movement, and relative movement is formed between the screen plate and the ball, so that the screening efficiency is effectively improved.
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Description

Technical Field

[0001] This invention relates to the field of hardware component screening technology, and more specifically to a screening device for intelligent manufacturing of hardware components. Background Technology

[0002] Steel balls are a common type of hardware component, often used in bearings. After processing, steel balls need to be screened using a screening device to remove those that do not meet specifications. Existing screening devices generally include a base, a housing, a spring installed between the base and the housing, a motor installed on the housing, an eccentric wheel, and a mesh plate installed inside the housing. In use, the motor installed on the housing is started, which drives the eccentric wheel to rotate. The housing shakes under the action of the spring, thus enabling the mesh plate to screen the steel balls.

[0003] However, when the eccentric wheel rotates, it causes the box to shake along with the spring. Since the spring's deformation is limited, the steel balls do not tumble significantly on the screen, which reduces the screening efficiency. Therefore, a screening device for intelligent manufacturing of hardware parts is proposed to solve the above-mentioned problems.

[0004] To address the aforementioned problems, this invention proposes a screening device for intelligent manufacturing of hardware parts. Summary of the Invention

[0005] The purpose of this invention is to overcome the problem of low screening efficiency in existing screening devices and to propose a screening device for intelligent manufacturing of hardware parts to solve the above-mentioned technical problems.

[0006] To achieve the objectives of this invention, the technical solution adopted is as follows:

[0007] A screening device for intelligent manufacturing of hardware components includes a base with a U-shaped cross-section. Multiple legs are fixedly connected to the bottom of the base. Multiple first springs are fixedly connected to the inner wall of the bottom of the base. A common housing is fixedly connected to the top of the multiple first springs. A groove is formed at the bottom of the housing. A fixed seat is fixedly connected to the inner wall of one end of the groove. A motor is fixedly connected to the other end of the fixed seat. The motor output shaft is connected to a connecting shaft. An eccentric wheel is fixedly fitted onto the connecting shaft. A separation groove is formed at the top of the housing. First openings are formed on both sides of the separation groove. A common mesh plate is inserted between the two first openings. Side plates are fixedly connected to both sides of the bottom of the mesh plate. Two symmetrically distributed second springs are fixedly connected to the inner side of the side plates. The other side of the second springs is fixedly connected to the housing. A first lug is fixedly connected to the outer wall of one side of the housing. A first shaft is rotatably connected to the first lug. An impact rod is fixedly fitted onto the top of the first shaft. A second bevel gear is fixedly connected to the bottom of the first shaft. A transmission mechanism is connected to the second bevel gear.

[0008] Preferably, the transmission mechanism includes a second lug, which is fixedly connected to the side of the housing near the first shaft. The rear end of the second lug is rotatably connected to a second shaft. A first pulley and a first bevel gear are sleeved and fixed on the second shaft. The first bevel gear and the second bevel gear are meshed and connected. A second pulley is sleeved and fixed on the connecting shaft. The same first belt is sleeved between the first pulley and the second pulley.

[0009] Preferably, the middle portion of the mesh plate has a serrated cross-section.

[0010] Preferably, the outer wall of the box body away from the first shaft has a discharge port, and a discharge plate is fixedly connected in the separation groove. The discharge plate passes through the discharge port and is inclined downward towards the discharge port.

[0011] Preferably, the inner walls at both ends of the separation tank are provided with a second opening, and the same top plate is inserted into the two second openings. Multiple sets of evenly distributed rake rods are fixedly connected to the bottom of the top plate, and the top plate is connected to a pulling mechanism.

[0012] Preferably, the pulling mechanism includes a connecting rod, which is fixedly connected to the top plate on the side near the first shaft. A fixed plate is fixedly connected to the front end of the box. A third shaft is rotatably connected to the top of the fixed plate. A disc is fixedly connected to the top of the third shaft. A connecting rod is rotatably connected to the side of the top of the disc. The connecting rod and the connecting rod are rotatably connected. A third pulley is fixedly fitted on both the third shaft and the first shaft. The same second belt is fitted between the two third pulleys.

[0013] Preferably, the top plate has multiple evenly distributed slots that extend through the top, and the multiple slots and multiple sets of rakes are staggered.

[0014] Preferably, the top of the discharge plate is provided with multiple sets of evenly distributed first partitions, with two first partitions in the same set arranged in a figure-eight shape, and the cross-section of the first partition is set in an arc shape.

[0015] Preferably, a second partition is provided on the opposite side of each of the two first partitions, the second partitions are inclined downward from the outside to the inside, and the multiple second partitions on the two first partitions are staggered with each other.

[0016] Beneficial effects:

[0017] 1. The ball bearings are placed onto the screen plate, and the motor is started. The motor output shaft drives the connecting shaft and eccentric wheel to rotate. Under the action of the first spring, the entire box and screen plate shake, and the ball bearings tumble on the screen plate for screening. At the same time, when the connecting shaft rotates, it synchronously drives the second pulley to rotate. Then, through the transmission cooperation of the first belt and the first pulley, it drives the second shaft and the first bevel gear to rotate. The first bevel gear meshes with and drives the second bevel gear to rotate. The second bevel gear then synchronously drives the first shaft and the impact rod to rotate. The impact rod intermittently impacts the side plate, causing the side plate and the entire screen plate to move outward along the direction of the first opening. This stretches the second spring, and under its reverse elastic force, it returns to its original position. This causes the screen plate to move back and forth between the two first openings, thus creating relative motion with the ball bearings, effectively improving the screening efficiency. Furthermore, the middle part of the screen plate has a serrated cross-section, which increases the contact area between the screen plate and the ball bearings. On the other hand, when the screen plate moves back and forth, the serrated part of the screen plate promotes the tumbling of the ball bearings, thereby further improving the screening efficiency.

[0018] 2. A top plate is provided. When the first shaft rotates, it synchronously drives the third pulley on it to rotate. Then, through the transmission cooperation of the third pulley and the second belt, the third shaft rotates. When the third shaft rotates, the connecting rod reciprocates to pull the connecting rod and the top plate, causing the top plate to move back and forth between the two second openings. The multiple rakes on the top plate can then turn the balls, thereby further improving the overall screening efficiency. Multiple slots are provided so that some of the turned balls can shuttle through the slots, thus avoiding the top plate inhibiting the turning of the balls.

[0019] 3. A first partition is provided. When balls that do not meet the specified size are screened by the screen, they fall between multiple sets of first partitions. Since the cross-section of the first partition is set to be arc-shaped, the distance between two first partitions gradually decreases from top to bottom, which can stratify the falling balls. Smaller balls fall to the lower position of the two first partitions, and larger balls fall to the upper position of the two first partitions. Then the balls slide down the first partitions for discharge, which effectively prevents the balls from colliding with each other and causing wear. Multiple second partitions are also provided. The second partitions on the two first partitions are staggered, which can further stratify the balls and reduce collisions between them. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the first angle structure of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0021] Figure 2 This is a second-angle structural schematic diagram of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0022] Figure 3 This is an enlarged structural diagram of point A of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0023] Figure 4 This is a schematic diagram of the screen structure of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0024] Figure 5 This is a schematic diagram of the top and bottom structure of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0025] Figure 6 This is a schematic diagram of the top structure of the discharge plate of a screening device for intelligent manufacturing of hardware parts according to the present invention;

[0026] Figure 7 This is an enlarged structural diagram of section B of a screening device for intelligent manufacturing of hardware parts according to the present invention.

[0027] The attached figures are labeled as follows:

[0028] 1. Base; 2. Support leg; 3. First spring; 4. Box body; 5. Groove; 6. Fixed seat; 7. Motor; 8. Connecting shaft; 9. Eccentric wheel; 10. Separation groove; 11. First opening; 12. Mesh plate; 13. Side plate; 14. Second spring; 15. First lug; 16. First shaft; 17. Impact rod; 18. Second lug; 19. Second shaft; 20. First bevel gear; 21. Second bevel gear; 22. First pulley; 23. Second pulley; 24. First belt; 25. Discharge plate; 26. Second opening; 27. Top plate; 28. Rake rod; 29. ​​Connecting rod; 30. Fixed plate; 31. Third shaft; 32. Disc; 33. Connecting rod; 34. Third pulley; 35. Second belt; 36. Groove; 37. First partition; 38. Second partition. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] The following is in conjunction with the appendix Figures 1-7 The present invention is further illustrated by the embodiments:

[0031] In this embodiment, as Figures 1-5As shown, a screening device for intelligent manufacturing of hardware parts includes a base 1 with a U-shaped cross-section. Multiple legs 2 are fixedly connected to the bottom of the base 1. Multiple first springs 3 are fixedly connected to the inner wall of the bottom of the base 1. A common housing 4 is fixedly connected to the top of the multiple first springs 3. A groove 5 is formed at the bottom of the housing 4. A fixing seat 6 is fixedly connected to the inner wall of one end of the groove 5. A motor 7 is fixedly connected to the other end of the fixing seat 6. The output shaft of the motor 7 is connected to a connecting shaft 8. An eccentric wheel 9 is sleeved and fixed on the connecting shaft 8. A separation groove 10 is formed at the top of the housing 4. Both sides of the separation groove 10... A first opening 11 is provided, and a mesh plate 12 is inserted between two first openings 11. Side plates 13 are fixedly connected to both sides of the bottom of the mesh plate 12. Two symmetrically distributed second springs 14 are fixedly connected to the inner side of the side plates 13. The other side of the second springs 14 is fixedly connected to the box body 4. A first lug 15 is fixedly connected to one side of the outer wall of the box body 4. A first shaft 16 is rotatably connected to the first lug 15. An impact rod 17 is fixedly fitted on the top of the first shaft 16. A second bevel gear 21 is fixedly connected to the bottom of the first shaft 16. The second bevel gear 21 is connected to a transmission mechanism.

[0032] Furthermore, the transmission mechanism includes a second lug 18, which is fixedly connected to the side of the housing 4 near the first shaft 16. The rear end of the second lug 18 is rotatably connected to a second shaft 19. A first pulley 22 and a first bevel gear 20 are sleeved and fixed on the second shaft 19. The first bevel gear 20 and the second bevel gear 21 are meshed and connected. A second pulley 23 is sleeved and fixed on the connecting shaft 8. The same first belt 24 is sleeved between the first pulley 22 and the second pulley 23, so that the first shaft 16 can be rotated through the connecting shaft 8.

[0033] Furthermore, the middle section of the screen 12 has a serrated cross-section, which can improve screening efficiency.

[0034] Furthermore, a discharge port is provided on the outer wall of the housing 4 away from the first shaft 16. A discharge plate 25 is fixedly connected inside the separation groove 10. The discharge plate 25 passes through the discharge port and is tilted downwards towards the discharge port, so that the balls that do not meet the specifications can be discharged.

[0035] Furthermore, the inner walls at both ends of the separation tank 10 are provided with second openings 26, and the same top plate 27 is inserted into the two second openings 26. Multiple sets of evenly distributed rake rods 28 are fixedly connected to the bottom of the top plate 27, and the top plate 27 is connected to a pulling mechanism, so that the top plate 27 can move between the two second openings 26.

[0036] Furthermore, the pulling mechanism includes a connecting rod 29, which is fixedly connected to the top plate 27 on the side near the first shaft 16. A fixing plate 30 is fixedly connected to the front end of the housing 4. A third shaft 31 is rotatably connected to the top of the fixing plate 30. A disc 32 is fixedly connected to the top of the third shaft 31. A connecting rod 33 is rotatably connected to the side of the top of the disc 32. The connecting rod 33 and the connecting rod 29 are rotatably connected. A third pulley 34 is fixedly fitted on both the third shaft 31 and the first shaft 16. The same second belt 35 is fitted between the two third pulleys 34, so that the top plate 27 can be pulled by the rotating disc 32.

[0037] Furthermore, the top plate 27 has multiple evenly distributed slots 36 through it. The multiple slots 36 and the multiple sets of rake rods 28 are staggered to avoid inhibiting the turning of the balls.

[0038] In this embodiment, refer to Figures 6-7 The top of the discharge plate 25 is provided with multiple sets of evenly distributed first partitions 37. The two first partitions 37 in the same set are arranged in a figure-eight shape. The cross section of the first partition 37 is set in an arc shape, so that the falling balls can be layered.

[0039] Furthermore, a second partition 38 is provided on the opposite side of each of the two first partitions 37. The second partitions 38 are inclined downward from the outside to the inside, and the multiple second partitions 38 on the two first partitions 37 are staggered to each other, which can improve the layering effect of the balls.

[0040] The balls are placed onto the screen plate 12, and the motor 7 is started. The output shaft of the motor 7 drives the connecting shaft 8 and the eccentric wheel 9 to rotate. Under the action of the first spring 3, the entire box 4 and the screen plate 12 shake, and the balls tumble on the screen plate 12 for screening. At the same time, when the connecting shaft 8 rotates, it synchronously drives the second pulley 23 to rotate. Then, through the transmission cooperation of the first belt 24 and the first pulley 22, it drives the second shaft 19 and the first bevel gear 20 to rotate. The first bevel gear 20 meshes and drives the second bevel gear 21 to rotate. The second bevel gear 21 then synchronously drives the first shaft 16 and the impact rod 17 to rotate. The impact rod 17 intermittently... The impact of the side plate 13 causes the side plate 13 and the screen plate 12 to move outward along the direction of the first opening 11, stretching the second spring 14 and resetting it under its reverse elastic force. This causes the screen plate 12 to reciprocate between the two first openings 11, creating relative motion with the balls and effectively improving screening efficiency. Furthermore, the middle section of the screen plate 12 has a serrated cross-section, which increases the contact area between the screen plate 12 and the balls. On the other hand, when the screen plate 12 moves back and forth, the serrated part of the screen plate 12 can promote the tumbling of the balls, thereby further improving screening efficiency.

[0041] Furthermore, a top plate 27 is provided. When the first shaft 16 rotates, it synchronously drives the third pulley 34 on it to rotate. Then, through the transmission cooperation of the third pulley 34 and the second belt 35, the third shaft 31 is driven to rotate. When the third shaft 31 rotates, the connecting rod 33 reciprocates the connecting rod 29 and the top plate 27, so that the top plate 27 moves back and forth between the two second openings 26. The multiple rakes 28 on the top plate 27 can turn the balls over, thereby further improving the overall screening efficiency. Multiple slots 36 are provided so that some of the turned balls can shuttle through the slots 36, thereby avoiding the top plate 27 inhibiting the turning of the balls.

[0042] Furthermore, a first partition 37 is provided. When balls that do not meet the specified size are screened by the screen plate 12, they fall between multiple sets of first partitions 37. Since the cross-section of the first partition 37 is set in an arc shape, the distance between two first partitions 37 gradually decreases from top to bottom, which can stratify the falling balls. Smaller balls fall to the lower position of the two first partitions 37, and larger balls fall to the upper position of the two first partitions 37. Then the balls slide down the first partitions 37 for discharge, thereby effectively preventing the balls from colliding with each other and causing wear. Multiple second partitions 38 are provided, and the second partitions 38 on the two first partitions 37 are staggered, which can further stratify the balls and reduce collisions between them.

[0043] Working principle: In use, the balls are placed onto the screen plate 12, and the motor 7 is started. The output shaft of the motor 7 drives the connecting shaft 8 and the eccentric wheel 9 to rotate. Under the action of the first spring 3, the entire box 4 and the screen plate 12 shake, and the balls tumble on the screen plate 12 for screening. At the same time, when the connecting shaft 8 rotates, it synchronously drives the second pulley 23 to rotate. Then, through the transmission cooperation of the first belt 24 and the first pulley 22, it drives the second shaft 19 and the first bevel gear 20 to rotate. The first bevel gear 20 meshes with and drives the second bevel gear 21 to rotate. The second bevel gear 21 then synchronously drives the first shaft 16 and the impact rod 17 to rotate. The impact rod 17 intermittently impacts the side plate. 13. This causes the side plate 13 and the screen plate 12 to move outward along the direction of the first opening 11, stretching the second spring 14 and causing it to reset under its reverse elastic force. This allows the screen plate 12 to reciprocate between the two first openings 11, creating relative motion with the balls and effectively improving screening efficiency. Furthermore, the middle section of the screen plate 12 has a serrated cross-section, which increases the contact area between the screen plate 12 and the balls. Additionally, when the screen plate 12 moves back and forth, the serrated portion promotes the tumbling of the balls, further improving screening efficiency. Furthermore, a top plate 27 is provided, which, when the first shaft... When the 16 rotates, it synchronously drives the third pulley 34 on it to rotate. Then, through the transmission cooperation of the third pulley 34 and the second belt 35, it drives the third shaft 31 to rotate. When the third shaft 31 rotates, it reciprocates to pull the connecting rod 29 and the top plate 27 through the connecting rod 33, so that the top plate 27 reciprocates between the two second openings 26. The multiple rakes 28 on the top plate 27 can turn the balls, thereby further improving the overall screening efficiency. Multiple slots 36 are provided so that some of the turned balls can shuttle through the slots 36, thereby avoiding the top plate 27 inhibiting the turning of the balls. Furthermore, a first partition 37 is provided so that when the balls do not meet the requirements, the first partition 37 can be used to prevent the balls from turning. After being screened by the mesh plate 12, the balls of specified dimensions fall between multiple sets of first partitions 37. Since the cross-section of the first partition 37 is set in an arc shape, the distance between two first partitions 37 gradually decreases from top to bottom, which can stratify the falling balls. Smaller balls fall to the lower position of the two first partitions 37, and larger balls fall to the upper position of the two first partitions 37. Then the balls slide down the first partitions 37 for discharge, which effectively prevents the balls from colliding with each other and causing wear. Multiple second partitions 38 are provided, and the second partitions 38 on the two first partitions 37 are staggered, which can further stratify the balls and reduce collisions between them.

[0044] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of the present invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A screening device for intelligent manufacturing of hardware parts, comprising a base (1), characterized in that, The base (1) has a U-shaped cross section. Multiple legs (2) are fixedly connected to the bottom of the base (1). Multiple first springs (3) are fixedly connected to the inner wall of the bottom of the base (1). The top of the multiple first springs (3) is fixedly connected to the same housing (4). The bottom of the housing (4) has a groove (5). A fixed seat (6) is fixedly connected to the inner wall of one end of the groove (5). A motor (7) is fixedly connected to the other end of the fixed seat (6). The output shaft of the motor (7) is connected to a connecting shaft (8). An eccentric wheel (9) is fixedly fitted on the connecting shaft (8). A separation groove (10) is opened on the top of the housing (4). A first opening (1) is opened on both sides of the separation groove (10). 1) A mesh plate (12) is inserted between the two first openings (11). Side plates (13) are fixedly connected to both sides of the bottom of the mesh plate (12). Two symmetrically distributed second springs (14) are fixedly connected to the inner side of the side plates (13). The other side of the second springs (14) is fixedly connected to the box body (4). A first ear block (15) is fixedly connected to the outer wall of one side of the box body (4). A first shaft (16) is rotatably connected to the first ear block (15). An impact rod (17) is fixedly fitted on the top of the first shaft (16). A second bevel gear (21) is fixedly connected to the bottom of the first shaft (16). A transmission mechanism is connected to the second bevel gear (21). The transmission mechanism includes a second ear block (18), which is fixedly connected to the side of the housing (4) near the first shaft (16). The rear end of the second ear block (18) is rotatably connected to a second shaft (19). A first pulley (22) and a first bevel gear (20) are sleeved and fixed on the second shaft (19). The first bevel gear (20) and the second bevel gear (21) are meshed and connected. A second pulley (23) is sleeved and fixed on the connecting shaft (8). The same first belt (24) is sleeved between the first pulley (22) and the second pulley (23). The middle section of the mesh plate (12) has a serrated cross-section; The outer wall of the box (4) away from the first shaft (16) has a discharge port. A discharge plate (25) is fixedly connected in the separation groove (10). The discharge plate (25) passes through the discharge port and is inclined downward towards the discharge port. The inner walls of both ends of the separation tank (10) are provided with second openings (26), and the same top plate (27) is inserted into the two second openings (26). Multiple sets of evenly distributed rakes (28) are fixedly connected to the bottom of the top plate (27), and the top plate (27) is connected to a pulling mechanism. The pulling mechanism includes a connecting rod (29), which is fixedly connected to the top plate (27) on the side near the first shaft (16). A fixing plate (30) is fixedly connected to the front end of the box (4). A third shaft (31) is rotatably connected to the top of the fixing plate (30). A disc (32) is fixedly connected to the top of the third shaft (31). A connecting rod (33) is rotatably connected to the side of the top of the disc (32). The connecting rod (33) and the connecting rod (29) are rotatably connected. A third pulley (34) is fixedly fitted on both the third shaft (31) and the first shaft (16). The same second belt (35) is fitted between the two third pulleys (34). The top plate (27) has multiple evenly distributed slots (36) through it, and the multiple slots (36) and multiple sets of rakes (28) are staggered. The top of the discharge plate (25) is provided with multiple sets of evenly distributed first partitions (37), and the two first partitions (37) in the same set are arranged in a figure-eight shape. The cross section of the first partition (37) is set in an arc shape. Each of the two first partitions (37) has a second partition (38) on its opposite side. The second partitions (38) are inclined downward from the outside to the inside, and the multiple second partitions (38) on the two first partitions (37) are staggered with each other.

2. A screening method for a screening device for intelligent manufacturing of hardware parts as described in claim 1, characterized in that: The ball bearings are placed onto the screen plate (12), and the motor (7) is started. The output shaft of the motor (7) drives the connecting shaft (8) and the eccentric wheel (9) to rotate. Under the action of the first spring (3), the box (4) and the screen plate (12) shake as a whole. The ball bearings tumble on the screen plate (12) for screening. At the same time, when the connecting shaft (8) rotates, it drives the second pulley (23) to rotate. Then, through the transmission cooperation of the first belt (24) and the first pulley (22), it drives the second shaft (19) and the first bevel gear (20) to rotate. The first bevel gear (20) meshes and drives the second bevel gear (21) to rotate. The second bevel gear (21) then rotates simultaneously. The first shaft (16) and the impact rod (17) rotate, and the impact rod (17) intermittently impacts the side plate (13), causing the side plate (13) and the mesh plate (12) to move outward along the direction of the first opening (11), stretching the second spring (14), and resetting under its reverse elastic force, so that the mesh plate (12) moves back and forth between the two first openings (11), thus forming relative motion with the ball. The middle part of the mesh plate (12) has a serrated cross section, which can increase the contact area between the mesh plate (12) and the ball. When the mesh plate (12) moves back and forth, the serrated cross section of the mesh plate (12) can pass through. A top plate (27) is provided to partially promote the tumbling of the balls. When the first shaft (16) rotates, it synchronously drives the third pulley (34) on it to rotate. Then, through the transmission cooperation of the third pulley (34) and the second belt (35), it drives the third shaft (31) to rotate. When the third shaft (31) rotates, it pulls the connecting rod (29) and the top plate (27) back and forth through the connecting rod (33), so that the top plate (27) moves back and forth between the two second openings (26). The balls can be tumbled by the multiple rakes (28) on the top plate (27). Multiple slots (36) are provided so that some of the tumbled balls can be placed in the slots (36). The ball moves through the screen and is equipped with a first partition (37). When the ball does not meet the size specifications, it is screened by the screen (12) and falls between multiple sets of first partitions (37). Since the cross section of the first partition (37) is set to be arc-shaped, the distance between the two first partitions (37) gradually decreases from top to bottom, so the falling ball can be layered. The smaller ball falls to the lower position of the two first partitions (37), and the larger ball falls to the upper position of the two first partitions (37). Then the ball slides down the first partition (37) to be discharged. Multiple second partitions (38) are provided, and the second partitions (38) on the two first partitions (37) are staggered.