A longitudinal slitting device for precision stainless steel cold-rolled thin strip

Abstract

The application discloses a longitudinal shearing and slitting device for precise stainless steel cold-rolled thin strips and relates to the field of stainless steel cold-rolled thin strip processing. The device comprises a base, an unwinding roller, a flattening mechanism, a cutting mechanism and a winding roller. The unwinding roller, the flattening mechanism, the cutting mechanism and the winding roller are installed on the base, and the flattening mechanism is provided with two groups. A separating mechanism is installed on the left side of the cutting mechanism, and the separating mechanism is connected with a polishing mechanism. The longitudinal shearing and slitting device for precise stainless steel cold-rolled thin strips adopts two groups of reciprocating polishing mechanisms, can polish the cutting edges of the stainless steel strips for multiple times after the stainless steel strips are slit, effectively guarantees the deburring effect of the cutting edges of the stainless steel strips, cooperates with a self-cleaning mechanism, can move the two polishing plates to the limit positions, automatically cleans the surface debris of one polishing plate, effectively avoids the adhesion of the debris and impurities and influences the polishing effect of the polishing plate on the stainless steel strips, and guarantees the polishing quality.

Description

Technical Field

[0001] This invention relates to the field of stainless steel cold-rolled strip processing technology, specifically to a precision stainless steel cold-rolled strip slitting device. Background Technology

[0002] As a high-end product in the field of stainless steel sheet and strip, precision stainless steel strip has excellent strength, dimensional accuracy, surface finish and other properties, and is widely used in various fields. After the production of precision stainless steel strip, its overall width is generally wide, and it needs to be cut into the required width by a slitting device. Existing precision stainless steel strip slitting devices, such as the slitting device and method for H-beam production disclosed in CN116100076B, include a frame, a strip roll shaft, and guide rollers. It also includes a slitting mechanism comprising multiple upper and lower cutters, a strip separation mechanism, and an edge grinding mechanism for grinding the edges of the slitting strips to reduce burrs. The edge grinding mechanism includes a mounting frame and at least two sets of grinding components, each comprising multiple grinding motors, multiple fixed grinding discs, multiple edge grinding rollers, and multiple movable grinding discs. The fixed grinding discs are fixedly mounted on the output ends of the corresponding grinding motors. A strip arranging mechanism is mounted on the frame and is used to merge the strips separated into at least two rows into a single parallel row. This invention facilitates the grinding of burrs on the edges of the H-beam strip raw material after slitting, reducing the impact on the welding and assembly of the H-beams. In actual use, although the existing precision stainless steel strip slitting and cutting device can grind the edges of the slit precision stainless steel strip, its grinding mechanism is fixed and relies mainly on the movement of the stainless steel strip and friction with the grinding mechanism to achieve the grinding effect. The grinding effect is poor, and as the grinding disc accumulates more debris and impurities during the grinding process, the grinding effect is greatly affected. The existing technical solution cannot clean the debris and impurities on the grinding disc, thus making it difficult to guarantee the grinding quality of the stainless steel strip edges. Summary of the Invention

[0003] The purpose of this invention is to provide a precision slitting device for cold-rolled stainless steel strips to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a precision stainless steel cold-rolled strip slitting device, comprising a base, an unwinding roller, a flattening mechanism, a cutting mechanism, and a winding roller. The base is equipped with the unwinding roller, the flattening mechanism, the cutting mechanism, and the winding roller, and two sets of flattening mechanisms are provided. The winding roller is driven by a motor. A separation mechanism is installed on the left side of the cutting mechanism. The separation mechanism is connected to a grinding mechanism. The grinding mechanism includes a movable frame, which is fixed to a movable bracket. Two sets of symmetrical grinding plates are provided inside the movable frame. A second spring is fixed between the grinding plates and the movable frame. A U-shaped frame is connected to the grinding plate. The U-shaped frame is slidably connected to the movable frame. The U-shaped frame can slide in contact with an inclined block. The inclined block is fixed on a fixed bracket. A cleaning brush is also fixed on the fixed bracket. The cleaning brush can slide in contact with the grinding plate.

[0005] Preferably, the flattening mechanism includes a first bracket, which is fixed on a base. A first cylinder is fixed on the first bracket, and a first mounting bracket is fixed to the output end of the first cylinder. An upper pressure roller is connected to the first mounting bracket by a bearing. A lower pressure roller is arranged directly below the upper pressure roller, and the lower pressure roller is connected to the first bracket by a bearing. Both the lower and upper pressure rollers are driven by a motor. The motor drives the lower and upper pressure rollers to move, which can both flatten and traction the stainless steel strip, thus providing a foundation for the normal operation of the device.

[0006] Preferably, the cutting mechanism includes a second bracket, which is fixed on the base and has a second cylinder fixed on it. The output section of the second cylinder is fixed with a second mounting bracket, and a first motor is fixed on the second mounting bracket. The output end of the first motor is connected to a cutting roller that is connected to the second mounting bracket by a bearing. The cutting roller is equipped with slitting blades at equal intervals. The height of the cutting roller can be adjusted by the second cylinder to accommodate cutting stainless steel strips of different thicknesses.

[0007] Preferably, a second motor is fixed on the second bracket, and the output end of the second motor is connected to the groove roller on the second bracket via a bearing. The groove roller has grooves, and the grooves on the groove roller correspond one-to-one with the slitting blades on the cutting roller. By cooperating with the slitting blades on the cutting roller, a basic guarantee can be provided for the cutting of stainless steel strips.

[0008] Preferably, the separating mechanism includes a transmission gear, which is symmetrically fixed on the groove roller. The transmission gear and the toothed ring cooperate to achieve transmission. The rotation of the groove roller drives the transmission gear to rotate. The transmission action between the transmission gear and the toothed ring allows the toothed ring to move left and right in an orderly manner.

[0009] Preferably, the toothed ring is fixed to one end of the connecting rod, and the other end of the connecting rod is fixed to the horizontal plate. The horizontal plate and the guide rod are slidably connected. The guide rod is fixed between the fixed frame and the second bracket. The fixed frame is fixed to the second bracket. The movement of the toothed ring can synchronously drive the horizontal plate to move. With the sliding guiding effect between the horizontal plate and the guide rod, the stability of the horizontal plate movement can be ensured.

[0010] Preferably, a fixing plate is provided above the horizontal plate, and vertical rods are symmetrically fixed to the lower end of the fixing plate. The vertical rods are slidably connected to the horizontal plate, and an mounting plate is fixed to the lower end of the vertical rods. The sliding action between the vertical rods and the horizontal plate can provide a basic guarantee for adjusting the height of the mounting plate.

[0011] Preferably, the horizontal plate is fixed to one end of the fixed rod, and the other end of the fixed rod is fixed to the movable frame. The movable frame and the guide rod are slidably connected. A slag-cleaning mechanism is fixed on the horizontal plate. By moving the horizontal plate, the fixed rod and the movable frame can be moved synchronously to ensure the normal operation of the device.

[0012] Preferably, a first spring is fixed between the mounting plate and the horizontal plate, and a separating blade is also fixed on the lower end face of the mounting plate. The separating blade corresponds one-to-one with the slitting blade on the cutting roller. The first spring provides force to the mounting plate and the separating blade. With the left and right movement of the separating blade, the slitting stainless steel strip can be automatically separated to avoid the stainless steel strip sticking together, and it is also convenient to grind the cut edges of the stainless steel strip in the future.

[0013] Preferably, the slag removal mechanism includes a slide rod, one end of which is fixed to a horizontal plate and is slidably connected to a fixing block fixed on a second bracket. The other end of the slide rod is fixed to a brush plate, and the brush plate slides in contact with the sliding blade on the cutting roller. With the above structure, the metal debris adhering to the sliding blade on the cutting roller can be cleaned, ensuring the sliding effect of the sliding blade on the cutting roller on the stainless steel strip.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The precision stainless steel cold-rolled strip slitting device adopts two sets of reciprocating grinding mechanisms, which can perform multiple grinding processes on the cut edges of the stainless steel strip after slitting, effectively ensuring the removal of burrs from the cut edges of the stainless steel strip. With the linkage of the self-cleaning mechanism, the two sets of grinding plates can move to their extreme positions to automatically clean the debris on the surface of one set of grinding plates, thereby effectively preventing debris and impurities from adhering and affecting the grinding effect of the grinding plates on the stainless steel strip, and ensuring the grinding quality. 2. The slitting device for precision stainless steel cold-rolled thin strip adopts a reciprocating separation mechanism, which can separate the cut stainless steel strips. This can not only prevent the narrow stainless steel strips from sticking together after slitting, but also facilitate the subsequent grinding of the cut edges of the stainless steel strips. In conjunction with the linkage cleaning mechanism, the cutting blades on the cutting roller can be automatically cleaned, ensuring the cutting effect of the cutting blades on the cutting roller on the stainless steel strip. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural diagram of the overall composition of the device of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the flattening mechanism of the present invention; Figure 3 This is a three-dimensional structural diagram of the cutting mechanism and the separating mechanism of the present invention; Figure 4 This is a three-dimensional structural diagram of the separation mechanism and the slag removal mechanism of the present invention; Figure 5 This is a bottom-view three-dimensional structural diagram of the separation mechanism of the present invention; Figure 6 This is a three-dimensional structural diagram of the grinding mechanism of the present invention; Figure 7 This is a partial enlarged three-dimensional structural schematic diagram of the grinding mechanism of the present invention; Figure 8 This is a front view of the left side of the grinding plate of the present invention in the cleaning state.

[0016] In the diagram: 1. Base; 2. Unwinding roller; 3. Flattening mechanism; 301. First support; 302. First cylinder; 303. First mounting frame; 304. Upper pressure roller; 305. Lower pressure roller; 4. Cutting mechanism; 401. Second support; 402. Second cylinder; 403. Second mounting frame; 404. First motor; 405. Cutting roller; 406. Second motor; 407. Grooving roller; 5. Separation mechanism; 501. Transmission gear; 502. Gear ring; 503. Connecting rod; 504. 505. Horizontal plate; 506. Guide rod; 507. Fixing frame; 508. Fixing plate; 509. Vertical rod; 510. Mounting plate; 511. First spring; 512. Separating knife; 513. Fixing rod; 514. Movable frame; 6. Slag cleaning mechanism; 601. Slide rod; 602. Fixing block; 603. Brush plate; 7. Grinding mechanism; 701. Movable frame; 702. Grinding plate; 703. U-shaped frame; 704. Second spring; 705. Inclined block; 706. Cleaning brush; 8. Rewinding roller. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-8 The present invention provides a technical solution: a slitting device for precision stainless steel cold-rolled thin strip, including a base 1, an unwinding roller 2, a flattening mechanism 3, a cutting mechanism 4 and a take-up roller 8. The base 1 is equipped with the unwinding roller 2, the flattening mechanism 3, the cutting mechanism 4 and the take-up roller 8, and the flattening mechanism 3 is provided in two sets. The take-up roller 8 is driven by a motor. A separation mechanism 5 is installed on the left side of the cutting mechanism 4. The separation mechanism 5 is connected to the grinding mechanism 7.

[0019] The flattening mechanism 3 includes a first bracket 301, which is fixed on the base 1. A first cylinder 302 is fixed on the first bracket 301, and a first mounting bracket 303 is fixed to the output end of the first cylinder 302. An upper pressure roller 304 is connected to the first mounting bracket 303 by a bearing. A lower pressure roller 305 is arranged directly below the upper pressure roller 304, and the lower pressure roller 305 is connected to the first bracket 301 by a bearing. Both the lower pressure roller 305 and the upper pressure roller 304 are driven by a motor. When using this precision stainless steel cold-rolled strip slitting device, such as Figures 1-7 As shown, by driving the upper pressure roller 304 and the lower pressure roller 305 by the motor, the stainless steel strip on the unwinding roller 2 can be pulled, so that the stainless steel strip moves from right to left. In conjunction with the motor driving the winding roller 8 to rotate, the cut stainless steel strip can be wound up. During the use of the device, the position of the upper pressure roller 304 can be adjusted by the first cylinder 302. In conjunction with the action of the lower pressure roller 305, the pressure generated by the upper pressure roller 304 on the stainless steel strip can be adjusted to achieve the flattening effect of the stainless steel strip. The cutting mechanism 4 includes a second bracket 401, which is fixed on the base 1. A second cylinder 402 is fixed on the second bracket 401, and a second mounting bracket 403 is fixed to the output section of the second cylinder 402. A first motor 404 is fixed on the second mounting bracket 403. The output end of the first motor 404 is connected to a cutting roller 405 with a bearing connected to the second mounting bracket 403. Cutting blades are installed at equal intervals on the cutting roller 405. A second motor 406 is fixed on the second bracket 401, and the output end of the second motor 406 is connected to a grooved roller 407 with a bearing connected to the second bracket 401. Grooves are provided on the grooved roller 407, and the grooves on the grooved roller 407 correspond one-to-one with the cutting blades on the cutting roller 405. When the stainless steel strip moves to the position of the cutting mechanism 4, such as Figures 1-7 As shown, the first motor 404 drives the cutting roller 405 to rotate, and the second motor 406 drives the groove roller 407 to rotate. Through the cooperation between the groove on the groove roller 407 and the slitting blade on the cutting roller 405, the stainless steel strip can be cut into multiple narrow stainless steel strips. The separating mechanism 5 includes a transmission gear 501, which is symmetrically fixed to the cutting roller 407 and engages with a gear ring 502 to achieve transmission. The gear ring 502 is fixed to one end of a connecting rod 503, and the other end of the connecting rod 503 is fixed to a horizontal plate 504. The horizontal plate 504 and a guide rod 505 are slidably connected. The guide rod 505 is fixed between a fixed frame 506 and a second support 401, and the fixed frame 506 is fixed to the second support 401. A fixed plate 507 is provided above the horizontal plate 504, and vertical rods 508 are symmetrically fixed to the lower end of the fixed plate 507. The vertical rods 508 are slidably connected to the horizontal plate 504. Meanwhile, a mounting plate 509 is fixed to the lower end of the vertical rod 508; the horizontal plate 504 is fixed to one end of the fixed rod 512, and the other end of the fixed rod 512 is fixed to the movable frame 513, and the movable frame 513 is slidably connected to the guide rod 505; a slag-cleaning mechanism 6 is fixed on the horizontal plate 504; a first spring 510 is fixed between the mounting plate 509 and the horizontal plate 504, and a separating blade 511 is also fixed to the lower end face of the mounting plate 509, and the separating blade 511 corresponds one-to-one with the slitting blade on the cutting roller 405; the slag-cleaning mechanism 6 includes a sliding rod 601, one end of the sliding rod 601 is fixed to the horizontal plate 504, and the sliding rod 601 is slidably connected to the fixed block 602 fixed on the second bracket 401, and the other end of the sliding rod 601 is fixed to the brush plate 603, while the brush plate 603 contacts and slides with the sliding blade on the cutting roller 405; After being cut, the stainless steel strip moves towards the separation mechanism 5, such as... Figures 1-7As shown, when the slot roller 407 rotates, it synchronously drives the transmission gear 501 to rotate. Combined with the transmission action between the transmission gear 501 and the gear ring 502, it drives the connecting rod 503 and the horizontal plate 504 to move left and right in an orderly manner. The sliding guidance action between the horizontal plate 504 and the guide rod 505 ensures the stability of the horizontal plate 504's movement. When the horizontal plate 504 moves, it synchronously drives the vertical rod 508, the mounting plate 509, and the separating blade 511 to move left and right in an orderly manner. The first spring 510 provides force to the mounting plate 509 and the separating blade 511. This allows the separating blade 511 to apply force to the cutting position of the slit stainless steel strip, which can not only separate multiple narrow stainless steel strips and prevent them from sticking together, but also facilitate subsequent grinding of the cut edges of the narrow stainless steel strips. When the horizontal plate 504 moves, it simultaneously drives the slide rod 601 and the brush plate 603 to move left and right in an orderly manner. In conjunction with the contact and sliding action between the brush plate 603 and the slitting blade on the cutting roller 405, it can clean the debris on the surface of the slitting blade on the cutting roller 405, ensuring the cutting effect of the slitting blade on the cutting roller 405 on the stainless steel strip. The polishing mechanism 7 includes a movable frame 701, which is fixed to a movable bracket 513. Two sets of symmetrical polishing plates 702 are arranged inside the movable frame 701. A second spring 704 is fixed between the polishing plates 702 and the movable frame 701. A U-shaped bracket 703 is connected to the polishing plates 702, and the U-shaped bracket 703 is slidably connected to the movable frame 701. The U-shaped bracket 703 can slide in contact with an inclined block 705. The inclined block 705 is fixed to a fixed bracket 506, and a cleaning brush 706 is also fixed to the fixed bracket 506. The cleaning brush 706 can slide in contact with the polishing plates 702. The separated narrow stainless steel strip continues to move toward the grinding mechanism 7, as... Figures 1-8 As shown, when the horizontal plate 504 moves left and right in an orderly manner, it simultaneously drives the movable frame 701, the U-shaped frame 703, and the grinding plate 702 to move back and forth in an orderly manner. At this time, the grinding plate 702 contacts the stainless steel strip, and the second spring 704 provides force to the grinding plate 702, so that the grinding plate 702 grinds the cut edge of the stainless steel strip, avoiding the presence of cutting burrs that would affect the safety of subsequent processing. Furthermore, when the two sets of grinding plates 702 move left and right in an orderly manner, as... Figure 7As shown, when the two sets of polishing plates 702 move to the right, the U-shaped frame 703 moves synchronously. When the right U-shaped frame 703 moves to contact and slide with the inclined surface of the right inclined block 705, the two polishing plates 702 on the right move synchronously, causing the upper right polishing plate 702 to move upward and the lower right polishing plate 702 to move downward. When the U-shaped frame 703 moves from the inclined surface of the inclined block 705 to the plane of the inclined block 705 and slides, the lower end face of the upper right polishing plate 702 contacts and slides with the upper right cleaning brush 706, and the lower right polishing plate 702... The upper end face slides in contact with the cleaning brush 706 on the lower right side, thereby automatically cleaning the impurities and debris on the grinding surfaces of the two grinding plates 702 on the right side. When the two grinding plates 702 move to the left, when the left U-shaped frame 703 moves to slide in contact with the inclined surface of the left inclined block 705, according to the above principle, the impurities and debris on the grinding surfaces of the two grinding plates 702 on the left side can be automatically cleaned, thereby avoiding the adhesion of impurities and debris on the grinding surfaces of the grinding plates 702 and affecting the grinding effect on the stainless steel strip. This is the working principle of the slitting device for precision stainless steel cold-rolled thin strip.

[0020] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0021] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A slitting device for precision stainless steel cold-rolled thin strip, comprising a base (1), an unwinding roller (2), a flattening mechanism (3), a cutting mechanism (4), and a take-up roller (8), wherein the base (1) is equipped with the unwinding roller (2), the flattening mechanism (3), the cutting mechanism (4), and the take-up roller (8), and the flattening mechanism (3) is provided in two sets, and the take-up roller (8) is driven by a motor, characterized in that: The cutting mechanism (4) is equipped with a separation mechanism (5) on its left side. The separation mechanism (5) is connected to the polishing mechanism (7). The polishing mechanism (7) includes a movable frame (701). The movable frame (701) is fixed to the movable frame (513). Two sets of symmetrical polishing plates (702) are provided on the inner side of the movable frame (701). A second spring (704) is fixed between the polishing plate (702) and the movable frame (701). A U-shaped frame (703) is connected to the polishing plate (702). The U-shaped frame (703) is slidably connected to the movable frame (701). The U-shaped frame (703) can slide in contact with the inclined block (705). The inclined block (705) is fixed on the fixed frame (506). A cleaning brush (706) is also fixed on the fixed frame (506). The cleaning brush (706) can slide in contact with the polishing plate (702).

2. The slitting and cutting device for precision cold-rolled stainless steel strip according to claim 1, characterized in that: The flattening mechanism (3) includes a first bracket (301), which is fixed on the base (1). A first cylinder (302) is fixed on the first bracket (301), and a first mounting bracket (303) is fixed at the output end of the first cylinder (302). An upper pressure roller (304) is connected to the bearing on the first mounting bracket (303). A lower pressure roller (305) is provided directly below the upper pressure roller (304), and the lower pressure roller (305) is connected to the bearing on the first bracket (301). Both the lower pressure roller (305) and the upper pressure roller (304) are driven by a motor.

3. The slitting and cutting device for precision cold-rolled stainless steel strip according to claim 1, characterized in that: The cutting mechanism (4) includes a second bracket (401), which is fixed on the base (1). A second cylinder (402) is fixed on the second bracket (401), and a second mounting bracket (403) is fixed on the output section of the second cylinder (402). At the same time, a first motor (404) is fixed on the second mounting bracket (403). The output end of the first motor (404) is connected to a cutting roller (405) on the second mounting bracket (403) by a bearing. Cutting blades are installed at equal intervals on the cutting roller (405).

4. The slitting device for precision stainless steel cold-rolled thin strip according to claim 3, characterized in that: The second motor (406) is fixed on the second bracket (401), and the output end of the second motor (406) is connected to the grooving roller (407) on the second bracket (401) by the bearing. The grooving roller (407) has a groove, and the groove on the grooving roller (407) corresponds one-to-one with the cutting blade on the cutting roller (405).

5. The slitting and cutting device for precision cold-rolled stainless steel strip according to claim 4, characterized in that: The separation mechanism (5) includes a transmission gear (501), which is symmetrically fixed on the groove roller (407) and the transmission gear (501) cooperates with the gear ring (502) to achieve transmission.

6. The slitting device for precision cold-rolled stainless steel strip according to claim 5, characterized in that: The toothed ring (502) is fixed to one end of the connecting rod (503), and the other end of the connecting rod (503) is fixed to the horizontal plate (504). The horizontal plate (504) and the guide rod (505) are slidably connected. At the same time, the guide rod (505) is fixed between the fixing frame (506) and the second bracket (401). The fixing frame (506) is fixed to the second bracket (401).

7. A slitting device for precision cold-rolled stainless steel strip according to claim 6, characterized in that: A fixing plate (507) is provided above the horizontal plate (504), and vertical rods (508) are symmetrically fixed at the lower end of the fixing plate (507). The vertical rods (508) and the horizontal plate (504) are slidably connected, and an installation plate (509) is fixed at the lower end of the vertical rods (508).

8. A slitting device for precision stainless steel cold-rolled thin strip according to claim 7, characterized in that: The horizontal plate (504) is fixed to one end of the fixed rod (512), and the other end of the fixed rod (512) is fixed to the movable frame (513). The movable frame (513) and the guide rod (505) are slidably connected. A slag cleaning mechanism (6) is fixed on the horizontal plate (504).

9. A slitting device for precision cold-rolled stainless steel strip according to claim 7, characterized in that: A first spring (510) is fixed between the mounting plate (509) and the horizontal plate (504), and a separating blade (511) is also fixed on the lower end face of the mounting plate (509), and the separating blade (511) corresponds one-to-one with the slitting blade on the cutting roller (405).

10. A slitting device for precision cold-rolled stainless steel strip according to claim 8, characterized in that: The slag removal mechanism (6) includes a slide rod (601), one end of which is fixed on the horizontal plate (504), and the slide rod (601) is slidably connected to the fixing block (602) fixed on the second bracket (401), and the other end of the slide rod (601) is fixed to the brush plate (603), while the brush plate (603) slides in contact with the sliding blade on the cutting roller (405).

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