Chain impact paper printer

Abstract

The utility model discloses chain type slaps paper mechanism belongs to paperboard processing equipment technical field. The utility model discloses including paper supporting mechanism, chain type paper slapping mechanism and chain type paper blocking mechanism, chain type paper slapping mechanism is located at the right side of paper supporting mechanism, and chain type paper blocking mechanism is located at the right side of chain type paper slapping mechanism. The utility model adopts the modularization layout of chain type paper slapping mechanism and chain type paper blocking mechanism, and sets up both at paper supporting mechanism both sides respectively, forms "slaps - block cooperation " and arranges the system of cooperation. On the structure, first paper blocking passive synchronous wheel and first paper blocking baffle sprocket are through first rotating shaft series connection, cooperate the support structure of first deep groove ball bearing and first paper slapping bearing seat, ensure the stability and low friction loss of rotating shaft in transmission process, and the third rotating shaft and fourth rotating shaft of chain type paper blocking mechanism are supported through a plurality of deep groove ball bearings and bearing seat, reduce the mechanical vibration when high -speed operation. The device has the advantages of high efficiency, high precision and strong stability.

Description

Technical Field

[0001] This utility model belongs to the technical field of cardboard processing equipment, specifically a chain-type paper-pressing mechanism. Background Technology

[0002] In the cardboard processing flow, the folded cardboard needs to be stapled, and the alignment accuracy before stapled directly affects the stapled quality.

[0003] In existing technologies, the striking mechanism mostly adopts the structure of "motor + eccentric wheel + linkage mechanism + striking plate". Its working logic is as follows: when the cardboard is conveyed, the striking block is first lifted up. After the tail of the cardboard passes through, the striking block falls down to complete the striking.

[0004] This solution has the following drawbacks:

[0005] Efficiency bottleneck: The reciprocating motion of the linkage is slow to respond and the tapping time is long, making it difficult to adapt to high-speed production lines (such as scenarios that process more than 100 pieces of cardboard per minute).

[0006] Insufficient precision: The single tapping method can only correct the deviation at the tail end, and the front end is prone to misalignment, resulting in the nail position shifting.

[0007] Poor stability: Mechanical connecting rods are prone to wear due to long-term high-speed operation, and their accuracy decreases over time, resulting in high maintenance costs.

[0008] Therefore, there is an urgent need to develop a highly efficient alignment mechanism with "pick-and-stop coordination and chain transmission" to overcome the above limitations. Utility Model Content

[0009] To address the problems mentioned in the background art, the purpose of this utility model is to provide a chain-type paper-pressing mechanism that has the advantages of high efficiency, high precision, and strong stability.

[0010] This utility model provides the following technical solution: a chain-type paper-pressing mechanism, including a paper-supporting mechanism, a chain-type paper-pressing mechanism, and a chain-type paper-stopping mechanism. The chain-type paper-pressing mechanism is located to the right of the paper-supporting mechanism, and the chain-type paper-stopping mechanism is located to the right of the chain-type paper-pressing mechanism. The chain-type paper-pressing mechanism comprises a first paper-stopping baffle sprocket, a first deep groove ball bearing, a spiral bevel gear commutator, a servo motor, a planetary reducer, a synchronous belt tensioning wheel spacer, a motor base, a paper-pressing tensioning wheel shaft, a first spacer, a first paper-pressing bearing seat, a first slider, and a first pull rod. The chain-type paper-stopping mechanism consists of a first rotating shaft, a first paper-stopping passive synchronous wheel, a paper-tapping base plate, a first support plate, a first hexagonal column, a second support plate, a first paper-stopping seat, a second paper-stopping plate, a second rotating shaft, a first friction block, an arc-tooth synchronous belt tensioning wheel, a gasket, a second deep groove ball bearing, a first belt, a first chain, a second chain, a third paper-stopping plate, a connecting plate, a drive wheel, and a second belt. The chain-type paper-stopping mechanism comprises a second paper-stopping baffle sprocket, a third deep groove ball bearing, a type A elastic retaining ring for the hole, a type A elastic retaining ring for the first shaft, and a paper-stopping active synchronous wheel. Wheel, second paper-stop passive synchronous wheel, second hexagonal column, third hexagonal column, fourth paper-stop plate, fifth paper-stop plate, third rotating shaft, transmission sleeve, fourth rotating shaft, second shaft elastic retaining ring type A, second friction block, support plate, second spacer, paper-stop moving plate, second paper-tapping bearing seat, second slider, second pull rod, adjusting block, tension bracket, tension wheel, bearing seat, first retaining ring, second retaining ring, third support plate, fourth support plate, second paper-stop seat, lower guide plate, fourth deep groove ball bearing, fifth deep groove ball bearing, third chain, and the... The system consists of three belts and connecting seats. The first paper-stopping passive synchronous pulley is connected in series with the first paper-stopping baffle sprockets on both sides via a first rotating shaft. The first rotating shaft is supported by a first deep groove ball bearing and a first paper-tapping bearing seat. The paper-stopping active synchronous pulley is connected to the second paper-stopping baffle sprockets on both sides via a third rotating shaft. The first paper-stopping passive synchronous pulley is connected to the second paper-stopping baffle sprockets on both sides via a fourth rotating shaft. The third and fourth rotating shafts are supported by a third deep groove ball bearing, a fourth deep groove ball bearing and bearing seat, and a second paper-tapping bearing seat.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model adopts a modular layout of the chain-type paper-feeding mechanism and the chain-type paper-stopping mechanism, which are respectively set on both sides of the paper-supporting mechanism to form a "feeding-stopping synergy" alignment system. Structurally, the first paper-stopping passive synchronous wheel and the first paper-stopping baffle sprocket are connected in series through the first rotating shaft, and with the support structure of the first deep groove ball bearing and the first paper-feeding bearing seat, the stability of the rotating shaft and low friction loss during transmission are ensured. The third and fourth rotating shafts of the chain-type paper-stopping mechanism are supported by multiple sets of deep groove ball bearings and bearing seats to reduce mechanical vibration during high-speed operation. This combination design of multi-bearing support and chain transmission not only ensures the motion synchronization between the mechanisms, but also reduces component wear by optimizing the mechanical connection structure, so that the device remains stable during long-term high-speed operation, fundamentally improving the durability and reliability of the equipment. This device has the advantages of high efficiency, high precision and strong stability.

[0013] 2. This utility model uses a servo motor connected to a planetary reducer and a drive wheel to form a high-precision power output unit. A first belt drives a first paper-stopping passive synchronous wheel, which in turn drives two sets of first paper-stopping sprockets to rotate synchronously via a first chain and a second chain. This causes the second and third paper-stopping plates, fixed to the upper and lower sides of the chain, to form a cyclic tapping structure. Compared to the reciprocating motion of traditional linkage mechanisms, the chain-type cyclic tapping eliminates the need for frequent starts and stops, significantly reducing response time. The precise speed control of the servo motor combined with the high rigidity of the chain drive ensures real-time matching between the tapping action and the paperboard conveying rhythm, completely solving the efficiency bottleneck problem caused by slow linkage response in existing technologies and significantly improving the automation capabilities of the production line. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the chain-type paper-tapping mechanism of this utility model;

[0016] Figure 3 This is a schematic diagram of the chain-type paper-stopping mechanism of this utility model.

[0017] In the diagram: 1. First paper-stopping baffle sprocket; 2. First deep groove ball bearing; 3. Spiral bevel gear commutator; 4. Servo motor; 5. Planetary reducer; 6. Synchronous belt tensioner spacer ring; 7. Motor base; 8. Paper-tapping tensioner shaft; 9. First spacer; 10. First paper-tapping bearing seat; 11. First slider; 12. First pull rod; 13. First rotating shaft; 14. First paper-stopping passive synchronous pulley; 15. Paper-tapping base plate; 16. First support plate; 17. First hexagonal column; 18. Second... 19. First paper stop plate; 20. Second paper stop plate; 21. Second rotating shaft; 22. First friction block; 23. Arc-tooth synchronous belt tensioner wheel; 24. Shim; 25. Second deep groove ball bearing; 26. First belt; 27. First chain; 28. Second chain; 29. ​​Third paper stop plate; 30. Connecting plate; 31. Drive wheel; 32. Second belt; 33. Second paper stop plate sprocket; 34. Third deep groove ball bearing; 35. Type A elastic retaining ring for holes; 3 6. Type A elastic retaining ring for the first shaft; 37. Active paper-stopping synchronous pulley; 38. Passive paper-stopping synchronous pulley for the second shaft; 39. Second hexagonal column; 40. Third hexagonal column; 41. Fourth paper-stopping plate; 42. Fifth paper-stopping plate; 43. Third rotating shaft; 44. Transmission sleeve; 45. Fourth rotating shaft; 46. Type A elastic retaining ring for the second shaft; 47. Second friction block; 48. Support plate; 49. Second spacer; 50. Paper-stopping moving plate; 51. Second paper-tapping bearing seat; 52. Second sliding... 53. Second pull rod; 54. Adjusting block; 55. Tensioning bracket; 56. Tensioning wheel; 57. Bearing seat; 58. First retaining ring; 59. Second retaining ring; 60. Third support plate; 61. Fourth support plate; 62. Second paper stop seat; 63. Lower guide plate; 64. Fourth deep groove ball bearing; 65. Fifth deep groove ball bearing; 66. Third chain; 67. Third belt; 68. Connecting seat; 69. Paper holding mechanism; 70. Chain-type paper tapping mechanism; 71. Chain-type paper stop mechanism. Detailed Implementation

[0018] 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.

[0019] like Figures 1 to 3As shown, the chain-type paper-tapping mechanism in this embodiment includes a paper-supporting mechanism 69, a chain-type paper-tapping mechanism 70, and a chain-type paper-stopping mechanism 71. The chain-type paper-tapping mechanism 70 is located to the right of the paper-supporting mechanism 69, and the chain-type paper-stopping mechanism 71 is located to the right of the chain-type paper-tapping mechanism 70. The chain-type paper-tapping mechanism 70 consists of a first paper-stopping baffle sprocket 1, a first deep groove ball bearing 2, a spiral bevel gear commutator 3, a servo motor 4, a planetary reducer 5, a synchronous belt tensioner spacer 6, a motor base 7, a paper-tapping tensioner shaft 8, a first spacer 9, a first paper-tapping bearing seat 10, a first slider 11, a first pull rod 12, a first rotating shaft 13, a first paper-stopping passive synchronous wheel 14, and a paper-tapping mechanism. The paper base plate 15, first support plate 16, first hexagonal column 17, second support plate 18, first paper stop seat 19, second paper stop plate 20, second rotating shaft 21, first friction block 22, arc tooth synchronous belt tensioning wheel 23, gasket 24, second deep groove ball bearing 25, first belt 26, first chain 27, second chain 28, third paper stop plate 29, connecting plate 30, drive wheel 31, and second belt 32; the chain-type paper stop mechanism 71 consists of a second paper stop baffle sprocket 33, a third deep groove ball bearing 34, a type A elastic retaining ring for holes 35, a type A elastic retaining ring for first shafts 36, a paper stop drive synchronous wheel 37, and a second paper stop passive synchronous wheel. Stepping wheel 38, second hexagonal column 39, third hexagonal column 40, fourth stop plate 41, fifth stop plate 42, third rotating shaft 43, transmission sleeve 44, fourth rotating shaft 45, second shaft elastic retaining ring type A 46, second friction block 47, support plate 48, second spacer 49, paper stop moving plate 50, second paper tapping bearing seat 51, second slider 52, second pull rod 53, adjusting block 54, tensioning bracket 55, tensioning wheel 56, bearing seat 57, first retaining ring 58, second retaining ring 59, third support plate 60, fourth support plate 61, second paper stop seat 62, lower guide plate 63, fourth deep groove ball bearing 64, fifth deep groove ball bearing The system consists of a third chain, a third belt, a third belt, and a connecting seat. The first paper-stopping passive synchronous wheel 14 is connected to the first paper-stopping baffle sprockets 1 on both sides via a first rotating shaft 13. The first rotating shaft 13 is supported by a first deep groove ball bearing 2 and a first paper-tapping bearing seat 10. The paper-stopping active synchronous wheel 37 is connected to the second paper-stopping baffle sprockets 33 on both sides via a third rotating shaft 43. The first paper-stopping passive synchronous wheel 14 is connected to the second paper-stopping baffle sprockets 33 on both sides via a fourth rotating shaft 45. The third rotating shaft 43 and the fourth rotating shaft 45 are supported by a third deep groove ball bearing 34, a fourth deep groove ball bearing 64, a bearing seat 57, and a second paper-tapping bearing seat 51.

[0020] refer to Figure 2The servo motor 4 is connected to the drive wheel 31 via the planetary reducer 5. The drive wheel 31 drives the first paper-blocking passive synchronous wheel 14 via the first belt 26. The first paper-blocking passive synchronous wheel 14 is connected to the front and rear sets of first paper-blocking baffle sprockets 1 via the first chain 27 and the second chain 28. The upper and lower sides of the chain are respectively fixed to the second baffle 20 and the third baffle 29 to form a cyclic tapping structure.

[0021] In this embodiment, a servo motor 4 is connected to the drive wheel 31 via a planetary reducer 5 to form a high-precision power output unit. The first belt 26 drives the first paper-stopping passive synchronous wheel 14, which in turn drives the front and rear sets of first paper-stopping baffle sprockets 1 to rotate synchronously via the first chain 27 and the second chain 28. This causes the second and third paper-stopping baffles 20 and 29, fixed to the upper and lower sides of the chain, to form a cyclic tapping structure. Compared to the reciprocating motion of traditional linkage mechanisms, the chain-type cyclic tapping eliminates the need for frequent starts and stops, significantly reducing response time. The precise speed control of the servo motor 4 combined with the high rigidity of the chain drive ensures real-time matching between the tapping action and the paperboard conveying rhythm, completely solving the efficiency bottleneck problem caused by slow linkage response in existing technologies and significantly improving the automation capabilities of the production line.

[0022] refer to Figure 3 The active paper-blocking synchronous wheel 37 is connected to the first passive paper-blocking synchronous wheel 14 via the third belt 67. The first passive paper-blocking synchronous wheel 14 is connected to the front and rear sets of second paper-blocking baffle sprockets 33 via the third chain 66. The upper and lower sides of the chain are respectively fixed to the fourth baffle plate 41 and the fifth baffle plate 42, forming a circulating blocking structure.

[0023] In this embodiment, the active paper-stopping synchronous wheel 37 is connected to the passive paper-stopping synchronous wheel 14 via the third belt 67, and drives the two sets of second paper-stopping baffle sprockets 33 at the front and rear via the third chain 66, so that the fourth paper-stopping plate 41 and the fifth paper-stopping plate 42 on the upper and lower sides of the chain form a cyclic blocking structure. This structure can synchronously correct the front-end position deviation during the paperboard conveying process: when the front end of the paperboard deviates, the cyclically moving paper-stopping plate achieves dynamic calibration through contact compression, forming a dual front and rear positioning with the chain-type paper-tapping mechanism 70's tapping correction of the tail end. This "front blocking and rear tapping" collaborative mechanism changes the limitation of traditional single tapping which can only correct the tail end, greatly improves the paperboard alignment accuracy, effectively avoids the problem of nailing position deviation caused by front-end misalignment, and greatly improves the accuracy of subsequent nailing operations.

[0024] refer to Figure 2 The first pallet 16 and the second pallet 18 are located below the chain paper feeding mechanism 70, and the third pallet 60 and the fourth pallet 61 are located below the chain paper blocking mechanism 71. The surface of the pallet is provided with a first friction block 22 and a second friction block 47 for stabilizing the paperboard transport.

[0025] In this embodiment, a first tray 16 and a second tray 18 are arranged below the chain-type paper-tapping mechanism 70, and a third tray 60 and a fourth tray 61 are arranged below the chain-type paper-blocking mechanism 71. The first friction block 22 and the second friction block 47 on the surface of the trays are made of highly wear-resistant rubber, and their surface texture design increases the friction between the cardboard and the tray. This design effectively suppresses the slippage or offset of the cardboard caused by speed changes or vibrations during transmission, providing a stable reference plane for the tapping and paper-blocking actions. When the cardboard passes the tray, the damping effect of the friction blocks keeps the cardboard moving in a uniform linear motion, ensuring that the cardboard position is fixed when the tapping plate contacts the paper-blocking plate, thereby improving the controllability of the alignment process and further consolidating the precision foundation of the entire mechanism.

[0026] refer to Figure 1 A photoelectric sensor is installed between the chain-type paper-tapping mechanism 70 and the chain-type paper-blocking mechanism 71. The photoelectric sensor is electrically connected to the control system of the servo motor 4 and the main motor, and the synchronous action control of the tapping plate and the paper block is realized through a preset algorithm.

[0027] This embodiment utilizes photoelectric sensors positioned between the paper-tapping and paper-blocking mechanisms to monitor the cardboard's position and conveying speed in real time, feeding the data back to the control systems of the servo motor 4 and the main motor. Through a pre-set synchronous control algorithm, the system dynamically adjusts the timing and speed of the tapping and blocking actions based on the cardboard's real-time status, enabling them to achieve synchronized responses in a very short time. For example, when fluctuations in the cardboard conveying speed are detected, the algorithm automatically adjusts the speed of the servo motor 4 to ensure that the tapping and blocking actions are always matched with the cardboard position, avoiding calibration deviations caused by asynchronous mechanical movements. This intelligent synchronous control mechanism upgrades the mechanism from "independent action" to "cooperative operation," significantly improving alignment efficiency while reducing manual debugging costs and significantly enhancing the equipment's adaptability to different working conditions.

[0028] The working principle and usage process of this utility model are as follows: When in use, the cardboard is conveyed to the paper support mechanism 69 by the front belt and supported by the first support plate 16, the second support plate 18, the third support plate 60, and the fourth support plate 61.

[0029] The first friction block 22 and the second friction block 47 on the surface of the pallet contact the bottom surface of the cardboard through a high friction coefficient material, suppressing the sliding deviation during the transmission process and ensuring that the cardboard enters the alignment area in a stable posture.

[0030] The servo motor 4 starts and drives the drive wheel 31 after the torque is amplified by the planetary reducer 5. The drive wheel 31 drives the first paper-stopping passive synchronous wheel 14 to rotate through the first belt 26. The first paper-stopping passive synchronous wheel 14 is connected in series with the first paper-stopping baffle sprockets 1 on both sides through the first rotating shaft 13. The first chain 27 and the second chain 28 drive the two sets of sprockets in front and behind to form a closed-loop transmission. The second paper-stopping plate 20 and the third paper-stopping plate 29, which are fixed on the upper and lower sides of the chain, move in a circular motion with the chain. When the tail of the paper-stopping plate reaches the paper-tapping area, the third paper-stopping plate 29 taps the middle position of the tail of the paper-stopping plate from bottom to top to correct the tail offset.

[0031] An external main motor drives the main drive shaft, which is connected to the first paper-blocking passive synchronous wheel 14 via the third belt 67. The third chain 66 drives the front and rear sets of second paper-blocking baffle sprockets 33 to rotate. The fourth baffle 41 and the fifth baffle 42 on the upper and lower sides of the chain form a circulating blocking structure. When the front end of the paperboard enters the paper-blocking area, the upper fourth baffle 41 is pressed down from above to the middle position of the front of the paperboard, forming a "front blocking and rear striking" coordination with the striking action of the paper-tapping mechanism.

[0032] The cardboard, after being corrected by the partner, is continued to be conveyed to the nailing station by the paper feeding mechanism 69. Since the front and rear edges have been precisely aligned, the nailing head (not marked in the figure) can be quickly positioned according to the preset coordinates.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A chain-type paper-pressing mechanism, characterized in that: The chain-type paper-pressing mechanism includes a paper-supporting mechanism (69), a chain-type paper-pressing mechanism (70), and a chain-type paper-stopping mechanism (71). The chain-type paper-pressing mechanism (70) is located to the right of the paper-supporting mechanism (69), and the chain-type paper-stopping mechanism (71) is located to the right of the chain-type paper-pressing mechanism (70). The chain-type paper-pressing mechanism (70) consists of a first paper-stopping baffle sprocket (1), a first deep groove ball bearing (2), a spiral bevel gear commutator (3), a servo motor (4), a planetary reducer (5), a synchronous belt tensioning wheel spacer (6), a motor base (7), a paper-pressing tensioning wheel shaft (8), a first spacer (9), a first paper-pressing bearing seat (10), a first slider (11), a first pull rod (12), a first rotating shaft (13), and a first paper stop. The passive synchronous wheel (14), paper-feeding base plate (15), first support plate (16), first hexagonal column (17), second support plate (18), first paper stop seat (19), second paper stop plate (20), second rotating shaft (21), first friction block (22), arc tooth synchronous belt tensioning wheel (23), gasket (24), second deep groove ball bearing (25), first belt (26), first chain (27), second chain (28), third paper stop plate (29), connecting plate (30), driving wheel (31), and second belt (32) are composed of a second paper stop baffle sprocket (33), a third deep groove ball bearing (34), a hole elastic retaining ring A-type (35), and a first shaft elastic retaining ring. Type A ring (36), paper stop active synchronous wheel (37), second paper stop passive synchronous wheel (38), second hexagonal column (39), third hexagonal column (40), fourth paper stop plate (41), fifth paper stop plate (42), third rotating shaft (43), transmission sleeve (44), fourth rotating shaft (45), second shaft elastic retaining ring Type A (46), second friction block (47), support plate (48), second spacer (49), paper stop moving plate (50), second paper tapping bearing seat (51), second slider (52), second pull rod (53), adjusting block (54), tension bracket (55), tension wheel (56), bearing seat (57), first retaining ring (58), second retaining ring (59), third support plate (60). The system comprises a fourth support plate (61), a second paper stop seat (62), a lower guide plate (63), a fourth deep groove ball bearing (64), a fifth deep groove ball bearing (65), a third chain (66), a third belt (67), and a connecting seat (68). The first paper stop passive synchronizing wheel (14) is connected in series with the first paper stop baffle sprockets (1) on both sides via a first rotating shaft (13). The first rotating shaft (13) is supported by the first deep groove ball bearing (2) and the first paper tapping bearing seat (10). The paper stop active synchronizing wheel (37) is connected to the second paper stop baffle sprockets (33) on both sides via a third rotating shaft (43). The first paper stop passive synchronizing wheel (14) is connected to the second paper stop baffle sprockets (33) on both sides via a fourth rotating shaft (45).The third rotating shaft (43) and the fourth rotating shaft (45) are supported by a third deep groove ball bearing (34), a fourth deep groove ball bearing (64), a bearing housing (57), and a second paper-pressing bearing housing (51).

2. The chain-type paper-pressing mechanism according to claim 1, characterized in that: The servo motor (4) is connected to the drive wheel (31) via the planetary reducer (5). The drive wheel (31) drives the first paper-blocking passive synchronous wheel (14) via the first belt (26). The first paper-blocking passive synchronous wheel (14) is connected to the front and rear sets of first paper-blocking baffle sprockets (1) via the first chain (27) and the second chain (28). The upper and lower sides of the chain are respectively fixed with the second baffle plate (20) and the third baffle plate (29) to form a cyclic beating structure.

3. The chain-type paper-pressing mechanism according to claim 2, characterized in that: The active paper-blocking synchronous wheel (37) is connected to the first passive paper-blocking synchronous wheel (14) via the third belt (67). The first passive paper-blocking synchronous wheel (14) is connected to the front and rear sets of second paper-blocking sprockets (33) via the third chain (66). The upper and lower sides of the chain are respectively fixed with the fourth paper-blocking plate (41) and the fifth paper-blocking plate (42) to form a circulating blocking structure.

4. The chain-type paper-pressing mechanism according to claim 3, characterized in that: The first pallet (16) and the second pallet (18) are located below the chain-type paper-feeding mechanism (70), and the third pallet (60) and the fourth pallet (61) are located below the chain-type paper-blocking mechanism (71). The surface of the pallet is provided with a first friction block (22) and a second friction block (47) for stabilizing the paperboard transport.

5. The chain-type paper-pressing mechanism according to claim 4, characterized in that: A photoelectric sensor is provided between the chain-type paper-tapping mechanism (70) and the chain-type paper-blocking mechanism (71). The photoelectric sensor is electrically connected to the control system of the servo motor (4) and the main motor, and the synchronous action control of the tapping plate and the paper block is realized through a preset algorithm.

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