Marking and locking equipment

Abstract

The invention relates to a marking and locking device which is used for marking a shell, assembling a PCB to the shell and then locking the shell, the marking and locking device comprises a processing platform, a rotating body and a carrier are arranged on the processing platform, and the rotating body horizontally rotates on the processing platform; the marking unit comprises a marking assembly and a first driving assembly which are arranged on the machining platform, and the first driving assembly is used for driving the marking assembly to move; the transferring unit comprises a suction assembly and a second driving assembly which are arranged on the machining platform, and the second driving assembly is used for driving the suction assembly to move; the locking unit comprises a screw locking assembly and a third driving assembly which are arranged on the machining platform, and the screw locking assembly is used for locking the shell provided with the PCB. The device is compact in structure, convenient to debug, capable of saving working space and high in automation degree, and therefore the production efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of PCB production equipment, and in particular to a marking and locking device. Background Art

[0002] At present, laser marking technology is widely used in various fields, and laser marking technology is one of the main applications of laser processing. Laser marking is a marking method that uses high-energy-density lasers to locally irradiate the workpiece, causing the surface material to vaporize or undergo a chemical reaction that changes color, thereby leaving a permanent mark. In the PCB production process, the shell needs to be marked, and then the PCB is loaded into the shell, and then the shell is locked to complete the assembly. In the existing method, it is necessary to cooperate with each other between different processing stations, and rely on manual methods to complete the above work process. However, the assembly stations between each station are usually completed manually.

[0003] The shortcomings of the existing technology are that, firstly, there is a certain distance between each workstation, and the operators need to go back and forth between different workstations, which takes a lot of time and reduces the production and assembly efficiency; and more manpower is required, thereby increasing the labor cost; and due to differences in the experience and operating level of the operators, the accuracy of the operation cannot be guaranteed. Summary of the invention

[0004] To this end, the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a marking and locking device with a compact structure, easy debugging, able to save working space, and a high degree of automation, thereby effectively improving production efficiency and ensuring the accuracy of operations and product quality to a certain extent. In addition, it can also effectively save labor cost investment.

[0005] In order to solve the above technical problems, the present invention provides a marking and locking device for marking a housing, assembling a PCB to the housing, and then locking the housing. The marking and locking device includes:

[0006] A processing platform, on which a rotating body and a carrier are provided, the rotating body rotates horizontally on the processing platform, the carrier is detachably mounted on the rotating body, and the housing and the PCB can be placed on the carrier;

[0007] A marking unit, comprising a marking component and a first driving component arranged on the processing platform, wherein the first driving component is used to drive the marking component to move, and the marking component is used to mark the housing;

[0008] A transfer unit, comprising a suction component and a second drive component disposed on the processing platform, wherein the second drive component is used to drive the suction component to move, and the suction component can suck the PCB and place the PCB in the housing;

[0009] A locking unit, comprising a locking screw assembly and a third driving assembly disposed on the processing platform, wherein the locking screw assembly is used to lock the housing assembled with the PCB;

[0010] Wherein, the marking unit, the transfer unit and the locking unit are arranged in sequence along the rotation direction of the rotating body.

[0011] In one embodiment of the present invention, a detection unit is further included, the detection unit includes a mounting seat and a laser sensor, the mounting seat is installed on the processing platform, the laser sensor is connected to the mounting seat, the laser sensor is set toward the surface of the rotating body, the laser sensor is used to detect the placement position of the PCB and the shell to determine whether the placement of the PCB and the shell on the carrier meets the requirements, and there is at least one laser sensor.

[0012] In one embodiment of the present invention, the detection unit, the marking unit, the transfer unit, and the locking unit are sequentially arranged along the rotation direction of the rotating body.

[0013] In one embodiment of the present invention, it also includes a loading unit for providing the PCB, the loading unit is adjacent to the processing platform, the loading unit includes a frame and a conveyor belt, the conveyor belt is installed on the frame, and at least one of the PCBs can be transported to a designated position through the conveyor belt.

[0014] In one embodiment of the present invention, a robot unit is further included, wherein the robot unit includes a first robot, and the first robot is used to grab the PCB and place it on the carrier; the robot unit also includes a second robot, and the second robot is used to grab the shell and place it on the carrier.

[0015] In one embodiment of the present invention, the carrier includes a first receiving groove, a second receiving groove and a third receiving groove arranged in sequence along its length direction, the first receiving groove is used to receive the PCB, and the second receiving groove and the third receiving groove are used to receive the shell.

[0016] In one embodiment of the present invention, the first driving assembly includes a first supporting seat, a first lifting driving member, a clamping member and a rotating driving member, the first supporting seat is fixedly arranged on the processing platform, the first lifting driving member is installed on the first supporting seat, the rotating driving member is arranged at the movable output end of the first lifting driving member, the clamping member is installed at the movable output end of the rotating driving member, the marking assembly is installed on the first supporting seat and arranged toward the clamping member, the clamping member can clamp the shell, and rotate under the drive of the rotating driving member, and move along the height direction driven by the first lifting driving member.

[0017] In one embodiment of the present invention, the second driving assembly includes a second supporting seat, a first translation assembly and a second lifting driving member, the second supporting seat is fixedly arranged on the processing platform, the first translation assembly includes a first horizontal driving member and a first guide rail slider module, the first guide rail slider module is arranged on the second supporting seat in a horizontal direction, the second lifting driving member is connected to the first guide rail slider module, the suction assembly is arranged at the active output end of the second lifting driving member, the suction assembly can suck the PCB, and move in the horizontal direction under the drive of the first translation assembly, and move in the height direction under the drive of the second lifting driving member.

[0018] In one embodiment of the present invention, the third driving assembly includes a third supporting seat, a second translation assembly and a third lifting driving member, the third supporting seat is fixedly arranged on the processing platform, the second translation assembly includes a second horizontal driving member and a second guide rail slider module, the second horizontal driving member is arranged on the third supporting seat, the second guide rail slider module is arranged on the third supporting seat along the horizontal direction, the third lifting driving member is connected to the second guide rail slider module, the locking screw assembly is connected to the movable output end of the third lifting driving member, and the locking screw assembly can move in the horizontal direction driven by the second translation assembly, and move in the height direction driven by the third lifting driving member.

[0019] In one embodiment of the present invention, a fourth driving assembly is further provided. The fourth driving assembly is disposed at the bottom of the processing platform and is used to drive the rotating body to move. The rotating body includes a turntable, and the turntable is in a circular shape.

[0020] The above technical solution of the present invention has the following advantages compared with the prior art:

[0021] The marking and locking device described in the present invention is provided with a processing platform, a marking unit, a transfer unit and a locking unit, wherein a rotating body capable of horizontal rotation is provided on the processing platform, and a carrier for placing the PCB and the housing is arranged on the rotating body. Driven by the rotating body, the PCB and the housing to be assembled can be moved to the marking station, the transfer station and the locking station in sequence, so that the housing can be marked according to the specified processing sequence, and then the PCB is placed on the housing through the action of the transfer unit, and the housing is fastened, and then the rotating body is rotated to the locking station, and the locking screw assembly is driven to lock the housing and the PCB, thereby completing the assembly process. The marking and locking device of the present invention has a compact structure, is easy to debug, can save working space, and has a high degree of automation, so that it can effectively improve production efficiency, and to a certain extent, ensure the accuracy of the operation and product quality. In addition, it can also effectively save labor cost investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0023] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment of the present invention when it cooperates with the loading unit.

[0024] Figure 2 It is a schematic diagram of the partial structure of the loading unit of the preferred embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of the partial structure of the housing and PCB when they are assembled on the carrier according to the preferred embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the partial structure of the detection unit of the preferred embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the partial structure of the marking unit of the preferred embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the partial structure of the transfer unit according to the preferred embodiment of the present invention.

[0030] Figure 8 It is a partial structural schematic diagram of a locking unit according to a preferred embodiment of the present invention.

[0031] Fig. 9 It is a partial structural schematic diagram of the cooperation between the rotating body and the fourth driving assembly in the preferred embodiment of the present invention.

[0032] Fig.10 yes Figure 2 Schematic diagram of the partial structure of the PCB and PCB tray.

[0033] Explanation of the reference numerals in the specification: 1. Shell; 11. Upper shell; 12. Lower shell; 2. Processing platform; 20. Rotating body; 21. Carrier; 210. First receiving slot; 211. Second receiving slot; 212. Third receiving slot; 3. Marking assembly; 30. First support seat; 31. First lifting drive member; 32. Clamping member; 33. Rotating drive member; 4. Suction assembly; 40. Second support seat; 41. Second lifting drive member; 43. First horizontal drive member; 44. First guide rail slider module; 5. Locking screw assembly; 50. Third support seat; 51. Third lifting drive member; 52. Second horizontal drive member; 53. Second guide rail slider module; 60. Mounting seat; 61. Laser sensor; 70. Frame; 71. Conveyor belt. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0035] Reference Figures 1 to 10 As shown, the present invention discloses a marking and screw locking device, which is used to mark a housing 1, then assemble a PCB 10 to the housing 1, and then lock the housing 1.

[0036] In detail, the housing 1 includes an upper housing 11 and a lower housing 12 , and the upper housing and the lower housing are locked with each other by screws. After assembly, the PCB is accommodated in the housing 1 .

[0037] Specifically, the marking and locking device includes a processing platform 2, on which a rotating body 20 and a carrier 21 are provided, the rotating body 20 rotates horizontally on the processing platform 2, the carrier 21 is detachably mounted on the rotating body 20, and the housing and the PCB can be placed on the carrier 21. It should be noted that there is at least one carrier 21, and multiple carriers 21 may be provided according to actual operation requirements.

[0038] The marking and locking device also includes a marking unit, and the marking unit also includes a marking component 3 and a first driving component arranged on the processing platform 2, wherein the first driving component is used to drive the marking component 3 to move, and the marking component 3 is used to mark the shell 1.

[0039] The marking and locking device also includes a transfer unit, which includes a suction component 4 and a second drive component arranged on the processing platform 2, and the second drive component is used to drive the suction component 4 to move. The suction component 4 can suck the PCB 10 and place the PCB 10 in the shell 1.

[0040] The marking and locking device further comprises a locking unit, which comprises a locking screw assembly 5 and a third driving assembly arranged on the processing platform 2, wherein the third driving assembly is used to drive the locking screw assembly 5 to move. The locking screw assembly 5 is used to lock the housing 1 assembled with the PCB 10.

[0041] The marking unit, the transfer unit and the locking unit are sequentially arranged along the rotation direction of the rotating body 20. With such arrangement, the carrier 21 can rotate synchronously with the rotating body 20 and sequentially pass through the marking unit, the transfer unit and the locking unit, so that the lower shell 12 placed on the carrier 21 is marked, and then the PCB 10 is grabbed and placed on the lower shell 12 by the transfer unit, and then the upper shell 11 is buckled with the lower shell 12, and then the upper shell 11 and the lower shell 12 are locked by the locking unit to complete the assembly.

[0042] It can be known from this that the marking and locking device to be protected by the present invention is provided with a processing platform, a marking unit, a transfer unit and a locking unit, wherein a rotating body capable of horizontal rotation is provided on the processing platform, and a carrier for placing the PCB and the housing is arranged on the rotating body. Driven by the rotating body, the PCB and the housing to be assembled can be moved to the marking station, the transfer station and the locking station in sequence, so that the housing can be marked according to the specified processing sequence, and then the PCB is placed on the housing through the action of the transfer unit, and the housing is fastened, and then the rotating body is rotated to the locking station, and the locking screw assembly is driven to lock the housing and the PCB, thereby completing the assembly process. The marking and locking device of the present invention has a compact structure, is easy to debug, can save working space, and has a high degree of automation, so that it can effectively improve production efficiency, and to a certain extent, ensure the accuracy of the operation and product quality. In addition, it can also effectively save labor cost investment.

[0043] Furthermore, the marking and locking device further includes a detection unit, which includes a mounting seat 60 and a laser sensor 61. The mounting seat 60 is mounted on the processing platform 2, and the laser sensor 61 is connected to the mounting seat 60. The laser sensor 61 is arranged toward the surface of the rotating body 20. Thus, the laser sensor 61 is used to detect the position of the PCB 10 and the housing 1 placed on the carrier 21 to determine whether the position placement meets the requirements, and the number of the laser sensor 61 is at least one.

[0044] As a preferred implementation, the detection unit, the marking unit, the transfer unit, and the locking unit are sequentially arranged along the rotation direction of the rotating body 20 .

[0045] Furthermore, the marking and locking device further comprises a loading unit for providing the PCB. The loading unit is disposed adjacent to the processing platform 2, and comprises a frame 70 and a conveyor belt 71, wherein the conveyor belt 71 is mounted on the frame 70, and at least one PCB 10 can be transported to a designated position via the conveyor belt 71.

[0046] In detail, the loading unit also includes a loading motor for driving the conveyor belt 71 to operate.

[0047] As a preferred embodiment, in order to improve the automation level of the marking and locking device, the marking and locking device further includes a robot unit. The robot unit includes a first robot, which is used to grab the PCB 10 and place it on the carrier 21. The robot unit also includes a second robot, which is used to grab the housing 1 and place it on the carrier 21.

[0048] Of course, in some other embodiments, for cost saving considerations, the robot unit may also include only one robot, which can be used to grasp and transfer the PCB 10 and the housing 1.

[0049] As a preferred embodiment, the carrier 21 includes a first receiving groove 210, a second receiving groove 211 and a third receiving groove 212 arranged in sequence along its length direction, the first receiving groove 210 is used to receive the PCB 10, and the second receiving groove 211 and the third receiving groove 212 are used to receive the shell 1.

[0050] Specifically, the second receiving groove 211 is used to receive the upper shell 11 or the lower shell 12 , and the third receiving groove 212 is used to receive the remaining part of the shell 1 .

[0051] As a preferred embodiment, the first driving assembly includes a first supporting seat 30, a first lifting driving member 31, a clamping member 32 and a rotating driving member 33. The first supporting seat 30 is fixedly arranged on the processing platform 2, the first lifting driving member 31 is installed on the first supporting seat 30, the rotating driving member 33 is arranged at the movable output end of the first lifting driving member 31, the clamping member 32 is installed at the movable output end of the rotating driving member 33, the marking assembly 3 is installed on the first supporting seat 30 and arranged toward the clamping member 32, the clamping member 32 can clamp the housing 1, and rotate under the drive of the rotating driving member 33, and at the same time, the clamping member 32 can also move in the height direction under the drive of the first lifting driving member 31.

[0052] During operation, the clamping member 32 clamps the lower shell 12 placed on the carrier 21 and rises a certain distance, and the lower shell 12 is rotated by the rotating drive member 33 so that the side of the lower shell 12 that needs to be marked can be directly opposite to the marking component 3, thereby facilitating the marking component 3 to mark the lower shell 12. After marking, the clamping member 32 drives the lower shell 12 to flip back to its original position, and falls through the first lifting drive member 3 until it is put back into the carrier 21. In this way, subsequent operations can be facilitated, and it is convenient for the suction component 4 to suck the PCB10 and place it in the lower shell 12.

[0053] Specifically, the first lifting driving member 31 includes but is not limited to a driving cylinder, and the rotating driving member 33 includes but is not limited to a rotating cylinder.

[0054] The clamping member 32 includes a pair of clamping jaws arranged opposite to each other, and the two clamping jaws can clamp and release the upper shell 11 or the lower shell 12 from both sides.

[0055] As a preferred embodiment, the second driving assembly includes a second supporting seat 40, a first translation assembly and a second lifting driving member 41, and the second supporting seat 40 is fixedly arranged on the processing platform 2. The first translation assembly includes a first horizontal driving member 43 and a first guide rail slider module 44, the first guide rail slider module 44 is arranged on the second supporting seat 40 in the horizontal direction, the second lifting driving member 41 is connected to the first guide rail slider module 44, the suction assembly 4 is arranged at the movable output end of the second lifting driving member 41, the suction assembly 4 can suck the PCB 10 and the shell 1, and move in the horizontal direction under the drive of the first translation assembly, and the suction assembly 4 can also move in the height direction under the drive of the second lifting driving member 41. In this way, the suction assembly 4 can place the PCB in the lower shell 12 after the marking is completed, and then suck the upper shell 11 and move it to engage with the lower shell 12 to facilitate the subsequent locking operation.

[0056] The second lifting driving member 41 includes but is not limited to a driving cylinder. The first horizontal driving member 43 includes but is not limited to a driving motor.

[0057] As a preferred embodiment, the suction assembly 4 includes a base and a plurality of vacuum suction nozzles arranged on the base.

[0058] As a preferred embodiment, the third driving assembly includes a third support seat 50, a second translation assembly and a third lifting driving member 51. The third support seat 50 is fixedly arranged on the processing platform 2. The second translation assembly includes a second horizontal driving member 52 and a second guide rail slider module 53. The second horizontal driving member 52 is arranged on the third support seat 50. The second guide rail slider module 53 is arranged on the third support seat 50 in the horizontal direction. The third lifting driving member 51 is connected to the second guide rail slider module 53. The locking screw assembly 5 is connected to the movable output end of the third lifting driving member 51. Therefore, the locking screw assembly 5 can move in the horizontal direction under the drive of the second translation assembly. At the same time, the locking screw assembly 5 can also move in the height direction under the drive of the third lifting driving member 51.

[0059] With such arrangement, the screw locking assembly 5 can move to the position where the screw hole on the housing 1 is located, and be driven to perform the screw locking operation, and tighten the screw holes one by one, thereby completing the assembly.

[0060] Specifically, the third lifting driving member 51 includes but is not limited to a driving cylinder, and the second horizontal driving member 52 includes but is not limited to a driving motor.

[0061] As a preferred embodiment, the marking and screw locking device is further provided with a fourth drive component 22, which is disposed at the bottom of the processing platform 2 and is used to drive the rotating body 20. The fourth drive component 22 includes but is not limited to a drive motor.

[0062] As a preferred embodiment, the rotating body 20 includes a turntable, which is in a circular shape and is rotatably connected to the processing platform 2 .

[0063] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A marking and locking device, used for marking a housing, assembling a PCB to the housing, and then locking the housing, characterized in that: The marking and locking equipment includes: A processing platform, on which a rotating body and a carrier are provided, the rotating body rotates horizontally on the processing platform, the carrier is detachably mounted on the rotating body, and the housing and the PCB can be placed on the carrier; A marking unit, comprising a marking component and a first driving component arranged on the processing platform, wherein the first driving component is used to drive the marking component to move, and the marking component is used to mark the housing; A transfer unit, comprising a suction component and a second drive component disposed on the processing platform, wherein the second drive component is used to drive the suction component to move, and the suction component can suck the PCB and place the PCB in the housing; A locking unit, comprising a locking screw assembly and a third driving assembly disposed on the processing platform, wherein the locking screw assembly is used to lock the housing assembled with the PCB; Wherein, the marking unit, the transfer unit and the locking unit are arranged in sequence along the rotation direction of the rotating body.

2. A marking and locking device according to claim 1, characterized in that: It also includes a detection unit, which includes a mounting seat and a laser sensor. The mounting seat is installed on the processing platform, and the laser sensor is connected to the mounting seat. The laser sensor is set toward the surface of the rotating body. The laser sensor is used to detect the placement position of the PCB and the shell to determine whether the placement of the PCB and the shell on the carrier meets the requirements. There is at least one laser sensor.

3. A marking and locking device according to claim 2, characterized in that: The detection unit, the marking unit, the transfer unit, and the locking unit are arranged in sequence along the rotation direction of the rotating body.

4. A marking and locking device according to claim 1, characterized in that: It also includes a loading unit for providing the PCB, the loading unit is adjacent to the processing platform, the loading unit includes a frame and a conveyor belt, the conveyor belt is installed on the frame, and at least one PCB can be transported to a designated position through the conveyor belt.

5. A marking and locking device according to claim 1 or 4, characterized in that: The robot unit also includes a first robot for grabbing the PCB and placing it on the carrier; the robot unit also includes a second robot for grabbing the shell and placing it on the carrier.

6. A marking and locking device according to claim 1, characterized in that: The carrier comprises a first receiving groove, a second receiving groove and a third receiving groove which are sequentially arranged along the length direction thereof, the first receiving groove is used for receiving the PCB, and the second receiving groove and the third receiving groove are used for receiving the shell.

7. A marking and locking device according to claim 1, characterized in that: The first driving component includes a first supporting seat, a first lifting driving member, a clamping member and a rotating driving member. The first supporting seat is fixedly arranged on the processing platform, the first lifting driving member is installed on the first supporting seat, the rotating driving member is arranged at the movable output end of the first lifting driving member, the clamping member is installed at the movable output end of the rotating driving member, the marking component is installed on the first supporting seat and arranged toward the clamping member, the clamping member can clamp the shell, and rotate under the drive of the rotating driving member, and move along the height direction driven by the first lifting driving member.

8. A marking and locking device according to claim 1, characterized in that: The second driving assembly includes a second supporting seat, a first translation assembly and a second lifting driving member. The second supporting seat is fixedly arranged on the processing platform. The first translation assembly includes a first horizontal driving member and a first guide rail slider module. The first guide rail slider module is arranged on the second supporting seat in a horizontal direction. The second lifting driving member is connected to the first guide rail slider module. The suction assembly is arranged at the active output end of the second lifting driving member. The suction assembly can absorb the PCB and move in the horizontal direction under the drive of the first translation assembly, and move in the height direction under the drive of the second lifting driving member.

9. A marking and locking device according to claim 1, characterized in that: The third driving assembly includes a third supporting seat, a second translation assembly and a third lifting driving member. The third supporting seat is fixedly arranged on the processing platform. The second translation assembly includes a second horizontal driving member and a second guide rail slider module. The second horizontal driving member is arranged on the third supporting seat. The second guide rail slider module is arranged on the third supporting seat along the horizontal direction. The third lifting driving member is connected to the second guide rail slider module. The locking screw assembly is connected to the movable output end of the third lifting driving member. The locking screw assembly can move in the horizontal direction driven by the second translation assembly, and can move in the height direction driven by the third lifting driving member.

10. A marking and locking device according to claim 1, characterized in that: A fourth driving assembly is also provided, which is arranged at the bottom of the processing platform and is used to drive the rotating body to move. The rotating body includes a turntable, and the turntable is in a circular ring shape.

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