Automatic rubberizing device and battery cell production equipment

Abstract

The utility model relates to the technical field of automatic production equipment, and discloses an automatic rubberizing device and battery cell production equipment, and the automatic rubberizing device comprises a rubberizing mechanism, a rubberizing preparation mechanism, a guide mechanism, a rubberizing pressing and cutting mechanism, a flexible buffer mechanism and a displacement mechanism, the adhesive tape pressing assembly comprises an adhesive tape pressing air cylinder and a pressing block arranged at the driving end of the adhesive tape pressing air cylinder, the adhesive tape pressing air cylinder drives the pressing block to press the passing adhesive tape onto a battery cell, the adhesive tape cutting assembly comprises an adhesive tape cutting air cylinder and a cutter arranged at the driving end of the adhesive tape cutting air cylinder, and the cutter cuts the adhesive tape after adhesive tape pressing is completed; the flexible buffering mechanism comprises a guide rail, a buffering rod, a buffering spring and a spring limiting block, the spring is compressed or stretched when bearing up-down force, the sliding block is arranged on the stretching side of the buffering spring, and the elastic force of the buffering spring is absorbed through movement of the sliding block on the guide rail. The device is simple in structure, convenient to operate and high in rubberizing precision.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic production equipment, and in particular to an automatic glue sticking device and a battery cell production equipment. Background Art

[0002] In the production process of products such as battery cells, glue sticking is an important link. Traditional glue sticking methods often rely on manual operation, with low efficiency and low precision. With the progress of technology and the development of automation technology, it has become an urgent need in the industry to develop a system that can automatically, accurately, and continuously stick glue.

[0003] At present, although there are some automatic glue sticking devices on the market, during the glue sticking process of the existing automatic glue sticking devices, since the glue sticking part will rub against the battery cell, there is a certain risk of damaging the battery cell. Summary of the Utility Model

[0004] The utility model provides an automatic glue sticking device and a battery cell production equipment, which can avoid damaging the battery cell during the glue sticking process.

[0005] The technical effects to be achieved by the present invention are realized through the following technical aspects:

[0006] In a first aspect, the utility model provides an automatic glue sticking device, including:

[0007] A tape feeding mechanism, arranged on the glue outlet side of the glue discharging mechanism, for feeding the tape;

[0008] A pressing and cutting glue mechanism, arranged on the discharging side of the tape feeding mechanism, including a glue pressing component and a glue cutting component. The glue pressing component includes a glue pressing cylinder and a pressing block arranged at the driving end of the glue pressing cylinder. The glue pressing cylinder drives the pressing block to press the passing tape onto the battery cell. The glue cutting component includes a glue cutting cylinder and a cutting tool arranged at the driving end of the glue cutting cylinder. The cutting tool cuts the tape after the glue pressing is completed; and

[0009] A flexible buffer mechanism, providing a buffering effect for the pressing and cutting glue mechanism; the flexible buffer mechanism includes a guide rail, a buffer rod, and a buffer spring. The buffer rod is arranged at one end of the buffer spring, and the buffer rod is arranged along the direction of the guide rail.

[0010] In some implementation manners, the flexible buffer mechanism is arranged between the glue cutting cylinder and the cutting tool.

[0011] In this implementation manner, the flexible buffer mechanism further includes a spring limit block, and the spring limit block is arranged inside or outside the buffer spring, for preventing the buffer spring from completing buffering within a preset track and avoiding deviation.

[0012] In some implementations, the tape loading mechanism includes a tape releasing mechanism, and the tape releasing mechanism includes a spring pressing block, a limiting spring, a tape releasing bearing, a bearing fixing block, a tape pressing block, a tape releasing main shaft, and a handle. The tape releasing bearing is sleeved on the tape releasing main shaft, the bearing fixing block is used to fix the tape releasing bearing, the tape releasing main shaft is used to rotate the tape to achieve the purpose of unwinding or rewinding, and the tape pressing block is used to press the tape.

[0013] In some implementations, the limiting spring applies pressure to the tape releasing bearing through the spring pressing block, the tape pressing block clamps the tape, and the handle is used to lock the tape pressing block, and the handle locks the tape by locking the tape pressing block.

[0014] In some implementations, the tape loading mechanism includes a tape preparation mechanism and a guiding mechanism. The tape preparation mechanism is arranged on the glue outlet side of the tape releasing mechanism. Before tape pasting, the tape preparation mechanism is used to prepare a certain length of tape in advance to facilitate fast and continuous tape pasting operations.

[0015] In some implementations, the guiding mechanism is arranged on one side of the tape preparation mechanism and is used to guide the tape to correctly pass through the tape preparation mechanism to ensure that the tape can accurately reach the tape pasting position;

[0016] The tape preparation mechanism includes a tape preparation cylinder, a slider connecting block, a guide rail, an inductor piece, and a groove switch. The tape preparation cylinder drives the slider connecting block to move forward along the guide rail. When the inductor piece is sensed by the groove switch, the tape preparation cylinder stops moving, and the tape preparation process is completed.

[0017] In some implementations, the guiding mechanism includes a guiding main shaft, a guiding block, and a guiding bearing. The guiding bearing is sleeved on the guiding main shaft, the tape passes through one side of the guiding block, and the axial position of the guiding block along the guiding bearing is adjustable.

[0018] In some implementations, it further includes a reinforcing rib, and both sides of the reinforcing rib are respectively connected to a glue pressing cylinder and a glue cutting cylinder.

[0019] In a second aspect, the present invention provides a battery cell production device, including the automatic tape pasting device as described above.

[0020] To sum up, the present utility model has at least the following advantages:

[0021] 1. Through the automatic tape pasting device of the present utility model, automatic, precise, and continuous tape pasting can be realized, greatly improving production efficiency and reducing labor costs;

[0022] 2. The utility model adopts a flexible buffer mechanism, which effectively protects the battery core from damage and improves the product quality;

[0023] 3. In addition, the structure of the utility model is simple, the operation is convenient, it is easy to maintain and repair, and it has high practical value and application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the automatic glue pasting device in the embodiment of the utility model;

[0025] Figure 2 It is a three-dimensional schematic diagram of the glue discharging mechanism in the embodiment of the utility model;

[0026] Figure 3 It is a three-dimensional schematic diagram of the guiding mechanism in the embodiment of the utility model;

[0027] Figure 4 It is a three-dimensional schematic diagram of the glue preparation mechanism in the embodiment of the utility model;

[0028] Figure 5 It is a three-dimensional schematic diagram of the pressing and cutting glue mechanism in the embodiment of the utility model;

[0029] Figure 6 It is a three-dimensional schematic diagram of the flexible buffer mechanism in the embodiment of the utility model;

[0030] Figure 7 It is a three-dimensional schematic diagram of the displacement mechanism in the embodiment of the utility model.

[0031] Markings in the figure:

[0032] 100. Glue discharging mechanism; 110. Spring pressing block; 120. Limiting spring; 130. Glue discharging bearing; 140. Bearing fixing block; 150. Tape pressing block; 160. Glue discharging main shaft; 170. Handle;

[0033] 200. Glue preparation mechanism; 210. Glue preparation cylinder; 220. Slide block connecting block; 230. Guide rail; 240. Inductor piece; 250. Groove type switch;

[0034] 300. Guiding mechanism; 310. Guiding main shaft; 320. Guiding block; 330. Guiding bearing;

[0035] 400. Pressing and cutting glue mechanism; 410. Glue pressing component; 411. Glue pressing cylinder; 412. Pressing block; 420. Glue cutting component; 421. Glue cutting cylinder; 422. Tool;

[0036] 500. Flexible buffer mechanism; 510. Guide rail; 520. Buffer rod; 530. Buffer spring; 540. Spring limit block;

[0037] 600. Displacement mechanism; 610. Y-direction displacement component; 611. Y-axis support column; 612. Y-axis connection block; 620. Z-direction displacement component; 621. Z-axis support column; 622. Z-axis fixing block;

[0038] 700. Reinforcing rib. Specific implementation manner

[0039] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. The described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments.

[0040] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0041] Example 1:

[0042] Please refer to the attached Figure 1 , in this embodiment, the automatic tape sticking device includes a tape releasing mechanism 100, which is used to place the tape. The function of the tape releasing mechanism 100 is to ensure that the tape can rotate and release smoothly when subjected to an external force; on the tape output side of the tape releasing mechanism 100, there is a tape preparing mechanism 200, which is used to prepare a certain length of tape in advance before tape sticking for quick and continuous tape sticking operations; a guiding mechanism 300, which is arranged on one side of the tape preparing mechanism 200 and is used to guide the tape to pass through the tape preparing mechanism 200 correctly to ensure that the tape can reach the tape sticking position accurately; a pressing and cutting mechanism 400, which includes a pressing component 410 and a cutting component 420. The pressing component 410 includes a pressing cylinder 411 and a pressing block 412 arranged at the driving end of the pressing cylinder 411. The pressing cylinder 411 drives the pressing block 412 to press the passing tape onto the battery cell. The cutting component 420 includes a cutting cylinder 412 and a cutter 422 arranged at the driving end of the cutting cylinder 412. The cutter 422 cuts the tape after the pressing is completed; a flexible buffer mechanism 500, which provides a buffering effect for the pressing and cutting mechanism to protect the product from the direct pressure of gravity and ensure the accuracy of tape sticking and the safety of the product; a displacement mechanism 600, which drives the pressing and cutting mechanism 400 to move in a specific direction to achieve precise tape sticking;

[0043] Among them, the flexible buffer mechanism 500 includes a guide rail 510, a buffer rod 520, a buffer spring 530, and a spring limit block 540. The spring compresses or stretches when subjected to up and down forces. The slider is provided on the side where the buffer spring 530 stretches, and the elastic force of the buffer spring 530 is absorbed by the movement of the slider on the guide rail 510.

[0044] During the actual operation process, the operator first places the tape on the tape dispensing mechanism 100. The tape on the tape dispensing mechanism 100 can rotate and release the tape smoothly when subjected to an external force. After the tape exits the tape dispensing mechanism 100, it enters the tape preparation mechanism 200, and a certain length of tape is formed at the tape preparation mechanism 200 waiting for the tape sticking operation. While the tape passes through the tape preparation mechanism 200, it also passes through the tape guiding mechanism. The tape guiding mechanism not only supports the spare tape but also limits the tape to prevent the tape from deviating from the preset position. After the tape passes through the tape dispensing mechanism 100 and the tape guiding mechanism, it enters the tape pressing and cutting mechanism 400. The displacement mechanism 600 drives the tape pressing and cutting mechanism 400 to perform the tape sticking and cutting operations. The pressing cylinder 411 in the tape pressing assembly 410 of the tape pressing and cutting mechanism 400 drives the pressing block 412 to stick the tape to the electrode tab of the battery cell. After the tape sticking is completed, the cutting cylinder 412 in the cutting assembly 420 drives the cutting tool 422 to cut the tape, and the next tape pressing and cutting operation is repeated.

[0045] In the description of this embodiment, when using the automatic tape sticking device of this embodiment to perform the tape sticking operation on one end of the battery cell, during the process of sticking the tape to one end of the battery cell, the pressing cylinder 411 drives the pressing block 412 to move in a "C" shape along one end of the battery cell. The displacement mechanism in this embodiment has the position ability in two perpendicular directions, so that it can drive the pressing block 412 to move in a "C" shape along one end of the battery cell. During the process of the pressing block 412 moving in a "C" shape along one end of the battery cell, the tape is stuck to one end of the battery cell to complete the tape sticking operation.

[0046] Through the automatic tape sticking device of the present utility model, automatic, precise, and continuous tape sticking can be realized, greatly improving the production efficiency and reducing the labor cost. At the same time, due to the adoption of the flexible buffer mechanism 500, the battery cell is effectively protected from damage, and the product quality is improved. In addition, the structure of the system is simple, the operation is convenient, it is easy to maintain and repair, and it has high practical value and application prospects.

[0047] Embodiment 2:

[0048] The difference between this embodiment and Embodiment 1 is that this embodiment further optimizes the structure of the automatic tape sticking device of the present utility model. Please refer to Figures 2 to 7 .

[0049] In this embodiment, the flexible buffer mechanism 500 in the automatic glue - sticking device is arranged between the glue - cutting cylinder 412 and the cutter 422. When the glue - cutting cylinder 412 drives the cutter 422 to cut the tape, the buffer spring 530 in the flexible buffer mechanism 500 can buffer the acting force on the cutter 422. The buffer spring 530 compresses or stretches when subjected to up - and - down forces. The slider is arranged on the side of elastic stretching, and the elastic force of the buffer spring 530 is absorbed through the movement of the slider on the guide rail 230. Thus, the cutter 422 is prevented from scratching the battery cell, ensuring the production yield.

[0050] In some embodiments, as Figure 2 shown, the glue - releasing mechanism 100 includes a spring pressing block 110, a limit spring 120, a glue - releasing bearing 130, a bearing fixing block 140, a tape pressing block 150, a glue - releasing main shaft 160, and a handle 170. The glue - releasing bearing 130 is sleeved on the glue - releasing main shaft 160. The bearing fixing block 140 is used to fix the bearing. The glue - releasing main shaft 160 is used to rotate the tape for the purpose of unwinding or rewinding. The tape pressing block 150 is used to press the tape. The limit spring 120 applies pressure to the bearing through the spring pressing block 110. The tape pressing block 150 clamps the tape, and the handle 170 is used to lock the tape pressing block 150. The handle 170 locks the tape by locking the tape pressing block 150.

[0051] Specifically, during the actual operation process, the pressure on the tape in the glue - releasing mechanism 100 can be adjusted by adjusting the handle 170, realizing the ability of the glue - releasing mechanism 100 to press the tape.

[0052] In some embodiments, as Figure 3 shown, the guiding mechanism 300 includes a guiding main shaft 310, a guiding block 320, and a guiding bearing 330. The guiding bearing 330 is sleeved on the guiding main shaft 310. The tape passes through one side of the guiding block 320, and the axial position of the guiding block 320 along the guiding bearing 330 is adjustable. When the tape passes through the guiding mechanism 300, the tape drives the guiding bearing 330 to freely rotate on the guiding main shaft 310. The friction mode between the tape and the guiding bearing 330 is rolling friction, reducing the frictional force and avoiding damage to the tape. By adjusting the axial position of the guiding block 320 along the guiding bearing 330, the guiding mechanism 300 can be adapted to different widths of angles, increasing the compatibility of the automatic glue - sticking device in this embodiment.

[0053] In the description of this embodiment, as Figure 4 shown, the glue - preparing mechanism 200 includes a glue - preparing cylinder 210, a slider connecting block 220, a guide rail 230, an inductor piece 240, and a groove - type switch 250.

[0054] Specifically, the glue preparation cylinder 210 drives the slider connecting block 220 to move forward along the guide rail 230. When the inductor piece 240 is sensed by the groove switch 250, the cylinder stops moving, completing the glue preparation process.

[0055] In some embodiments, as Figure 5 shown, the displacement mechanism 600 includes a Y-direction displacement component 610 and a Z-direction displacement component 620; the Y-direction displacement component 610 includes a Y-axis support column 611 and a Y-axis connecting block 612, and the glue cutting cylinder 412 is fixedly arranged on the Y-axis support column 611 through the Y-axis connecting block 612; the Z-direction displacement component 620 includes a Z-axis fixing block 622 and a Z-axis connecting block, and the glue pressing cylinder 411 is fixedly arranged on the Z-axis support column 621 through the Z-axis connecting block; wherein, the glue cutting cylinder 412 and the glue pressing cylinder 411 move coordinately to drive the entire tape sticking device to move in a three-dimensional space. The Y direction in this embodiment is opposite to the driving direction of the glue pressing cylinder 411, and the Z direction in this embodiment is opposite to the driving direction of the glue cutting cylinder 412.

[0056] In the description of this embodiment, as Figure 6 shown, the moving directions of the glue cutting cylinder 412 and the glue pressing cylinder 411 are perpendicular to each other. The "perpendicular" described here should be understood in a broad sense. The purpose is to enable the glue cutting cylinder 412 and the glue pressing cylinder 411 to perform coordinated operations in three-dimensional directions. In some other embodiments, the positional relationship of the moving directions of the glue cutting cylinder 412 and the glue pressing cylinder 411 can also form a certain angle or a parallel relationship, which is not limited herein.

[0057] Specifically, during the actual operation process, the glue pressing cylinder 411 drives the pressing block 412 to press the tape onto the electrode tab of the battery cell, and then the glue cutting cylinder 412 drives the cutter 422 to cut the tape, leaving a properly sized tape stuck on the electrode tab of the battery cell.

[0058] In one embodiment, the length of the tape stuck on the electrode tab of the battery cell can be controlled by controlling the cutting position of the cutter 422 to be suitable for the tape sticking operations of battery cells of different specifications.

[0059] In some embodiments, the automatic tape sticking device further includes a workbench surface, and the Y-axis support column 611 is locked with the workbench surface 700. The overall operation of the automatic tape sticking device is carried out on the workbench surface, which is convenient for the operation of the operator.

[0060] In one embodiment, as Figure 7 shown, the automatic tape sticking device further includes a reinforcing rib 700 for connecting the glue pressing cylinder 411 and the Z-axis fixing block 622 to increase the stability of the device.

[0061] Embodiment 3:

[0062] This embodiment provides a battery cell production device. The battery cell production device of this embodiment includes the battery cell gluing device of Embodiment 1 or Embodiment 2. The battery cell gluing device includes a glue feeding mechanism 100, a glue preparation mechanism 200, a guiding mechanism 300, a pressing and cutting mechanism 400, a flexible buffer mechanism 500, and a displacement mechanism 600. Each of these mechanisms cooperates to perform the operation of gluing the produced battery cells in this battery cell production device.

[0063] Through the automatic gluing device, this battery cell production device can achieve automatic, precise, and continuous gluing of the tape, greatly improving production efficiency and reducing labor costs. At the same time, due to the adoption of the flexible buffer mechanism in this utility model, the battery cells are effectively protected from damage, improving product quality.

[0064] In this utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0065] In the description of this utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of this utility model is usually placed. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to this utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0066] In addition, terms such as "horizontal", "vertical", "hanging" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0067] In the present utility model, unless otherwise clearly specified and defined, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being above, on top of, and over the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, beneath, and under the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0068] Although the description of the present utility model is made in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications, and variations based on the above content. Therefore, all such substitutions, improvements, and variations are included within the spirit and scope of the appended claims.

Claims

1. An automatic adhesive pasting device, characterized in that, including a tape loading mechanism, disposed on the glue discharging side of the glue discharging mechanism (100), for loading the tape; a pressing and cutting glue mechanism (400), disposed on the discharging side of the tape loading mechanism, including a glue pressing component (410) and a glue cutting component (420), the glue pressing component includes a glue pressing cylinder (411) and a pressing block (412) disposed at the driving end of the glue pressing cylinder, the glue pressing cylinder (411) drives the pressing block (412) to press the passing tape onto the battery cell, the glue cutting component (420) includes a glue cutting cylinder (421) and a cutter (422) disposed at the driving end of the glue cutting cylinder, and the cutter cuts the tape after the glue pressing is completed; and a flexible buffer mechanism (500), providing a buffering effect for the pressing and cutting glue mechanism; the flexible buffer mechanism (500) includes a guide rail (510), a buffer rod (520) and a buffer spring (530), the buffer spring (530) is disposed at one end of the buffer rod (520), and the buffer rod (520) is arranged along the direction of the guide rail (510).

2. The automatic gluing device according to claim 1, wherein The flexible buffer mechanism (200) is disposed between the glue cutting cylinder (421) and the cutter (422).

3. An automatic gluing device according to claim 2, characterized in that, The flexible buffer mechanism (500) further includes a spring limit block (540), and the spring limit block (540) is disposed inside or outside the buffer spring (530), for preventing the buffer spring (530) from completing buffering within a preset track and avoiding deviation.

4. The automatic gluing device according to claim 1, characterized in that, The tape loading mechanism includes a glue discharging mechanism (100), the glue discharging mechanism (100) includes a spring pressing block (110), a limit spring (120), a glue discharging bearing (130), a bearing fixing block (140), a tape pressing block (150), a glue discharging main shaft (160) and a handle (170), the glue discharging bearing (130) is sleeved on the glue discharging main shaft (160), the bearing fixing block (140) is used for fixing the glue discharging bearing (130), the glue discharging main shaft (160) is used for rotating the tape to achieve the purpose of unwinding or rewinding, and the tape pressing block (150) is used for pressing the tape.

5. The automatic adhesive pasting device according to claim 4, wherein, The limit spring (120) applies pressure to the glue discharging bearing (130) through the spring pressing block (110), the tape pressing block (150) clamps the tape, and the handle is used for locking the tape pressing block, and the handle locks the tape by locking the tape pressing block.

6. The automatic gluing device according to claim 4, wherein The tape loading mechanism includes a glue preparing mechanism (200) and a guiding mechanism (300), the glue preparing mechanism (200) is disposed on the glue discharging side of the glue discharging mechanism (100), and before tape pasting, the glue preparing mechanism (200) is used for pre-preparing a certain length of tape to facilitate fast and continuous tape pasting operations.

7. The automatic gluing device according to any one of claims 1 to 6, characterized in that, The guiding mechanism (300) is disposed on one side of the glue preparing mechanism (200), for guiding the tape to correctly pass through the glue preparing mechanism (200) to ensure that the tape can accurately reach the tape pasting position; The glue preparation mechanism (200) includes a glue preparation cylinder (210), a slider connection block (220), a guide rail (230), an inductor sheet (240), and a groove switch (250). Among them, the glue preparation cylinder (230) drives the slider connection block to move forward along the guide rail (230). When the inductor sheet (240) is sensed by the groove switch, the glue preparation cylinder (210) stops moving, completing the glue preparation process.

8. The automatic gluing device according to any one of claims 1 to 6, characterized in that, The guiding mechanism (300) includes a guiding main shaft (310), a guiding block (320), and a guiding bearing (330). The guiding bearing (330) is sleeved on the guiding main shaft (310). The tape passes through one side of the guiding block (320), and the axial position of the guiding block (320) is adjustable along the guiding bearing (330).

9. The automatic gluing device according to claim 8, characterized in that, It further includes a reinforcing rib (700), and both sides of the reinforcing rib (700) are respectively connected to the glue pressing cylinder (411) and the glue cutting cylinder (421).

10. A core production device, characterized in that: The device includes the automatic glue sticking device according to any one of claims 1-9.

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