Aluminum trough cover plate pedal bracket bending machine

Abstract

The present invention discloses a bending machine for a foot pedal bracket of an electrolytic cell cover plate, which comprises a workbench, a telescopic drive, a rotary drive, a center wheel, a first bending wheel, a second bending wheel, a third bending wheel, a first bending pressure block, and a second bending pressure block. Advantages: After placing an aluminum tube in the space between a support member and the center wheel and the first bending wheel, the rotary drive and the telescopic drive are sequentially activated, and the aluminum tube can be bent into a finished foot pedal bracket through the cooperation of the rotating third bending wheel and the moving first bending wheel, the second bending wheel, the second bending pressure block, and the first bending pressure block. This can achieve one-time molding, is easy to operate, and can effectively improve production efficiency, shorten production period, and reduce production costs.

Description

Technical field:

[0001] The invention relates to the technical field of aluminum electrolytic cells, in particular to a bending machine for a foot pedal bracket of an aluminum cell cover plate. Background technology:

[0002] like Figure 1 As shown, the aluminum electrolytic cell mainly includes an electrolytic cell body, an electrode assembly and a cell cover plate. The electrode assembly is installed directly above the electrolytic cell body. A cell cover plate 36 for sealing the electrolytic cell body is installed between the electrode assembly and the electrolytic cell body 35 on both sides. During the production process, it is necessary to go up to the top of the cell cover plate to inspect and repair the electrodes. Therefore, it is necessary to install a foot pedal on the top of the cell cover plate 36. The foot pedal is mainly fixed to the top of the cell cover plate by a foot pedal bracket 37. The foot pedal is V-shaped as a whole, and the two sides of the V-shaped opening are folded outward and fixed to the cell cover plate. The foot pedal is installed on the top of the foot pedal bracket. The foot pedal bracket is mainly formed by bending an aluminum tube. However, due to the large number of foot pedal brackets, there is currently a lack of dedicated foot pedal bracket bending equipment. Therefore, there are problems such as difficulty in bending, low production efficiency, and high labor costs. Summary of the invention:

[0003] The purpose of the present invention is to provide an aluminum trough cover plate foot pedal bracket bending machine which can effectively improve production efficiency.

[0004] The present invention is implemented by the following technical solutions: a bending machine for a foot pedal bracket of an electrolytic cell cover plate, characterized in that it includes a workbench, a telescopic drive, a rotary drive, a center wheel, a first bending wheel, a second bending wheel, a third bending wheel, a first bending pressure block and a second bending pressure block, a horizontally rotating center wheel is provided at the center of the top of the workbench, the first bending wheel and the second bending wheel that slide relatively are provided on the workbench on one side of the center wheel, and the first bending wheel and the second bending wheel are symmetrically arranged about the center wheel; the telescopic drive that drives the first bending wheel and the second bending wheel to slide relative to each other is fixed on the top surface of the workbench movement; a first bending pressure block and a second bending pressure block are respectively provided on the workbench on the side adjacent to the center wheel at the travel terminals of the first bending wheel and the second bending wheel, the first bending pressure block is fixed on the workbench on one side of the first bending wheel, and a supporting member for supporting the aluminum tube is provided on the workbench between the first bending pressure block and the center wheel; the second bending pressure block is movably arranged on one side of the second bending wheel through a swing structure; the third bending wheel rotating around the center wheel is provided on the workbench on the other side of the center wheel, and the rotation drive drives the third bending wheel to rotate around the center wheel.

[0005] Furthermore, the telescopic drive includes a first telescopic rod and a second telescopic rod. The first telescopic rod for driving the first bending wheel to move is fixed on the top surface of the workbench, and the second telescopic rod for driving the second bending wheel to move is fixed on the top surface of the workbench.

[0006] Furthermore, the swing structure includes a swing arm, the middle part of the swing arm is rotatably connected to the workbench, the second bending pressure block is fixed to one end of the swing arm, and the other end of the swing arm is hinged to the telescopic end of the second telescopic rod through a connecting rod.

[0007] Furthermore, the telescopic drive includes a third telescopic rod, the first bending wheel is slidably arranged on the top surface of the workbench through a first sliding seat, and a first swing arm and a first driving frame are sequentially provided on the top surface of the workbench on the other side of the first bending wheel away from the center wheel, the middle part of the first swing arm is rotatably connected to the workbench, and a first slide groove is provided at both ends of the first swing arm, and a first pin is provided on the first sliding seat and the first driving frame, and the first pin is slidably arranged in the adjacent first slide groove; the third telescopic rod is fixed to the top surface of the workbench, and the arrangement direction of the third telescopic rod is parallel to the sliding direction of the first sliding seat; the telescopic end of the third telescopic rod is fixedly connected to the first driving frame; the second bending wheel is slidably arranged on the top surface of the workbench through a second sliding seat, and the second sliding seat is fixedly connected to the telescopic end of the third telescopic rod.

[0008] Furthermore, the swing structure includes a swing arm, the middle part of the swing arm is rotatably connected to the workbench, the second bending pressure block is fixed to one end of the swing arm, and the other end of the swing arm is provided with a second slide groove. A second drive frame is slidingly provided on the workbench between the other end of the swing arm and the third telescopic rod, and the second drive frame is fixedly connected to the telescopic end of the third telescopic rod; a second pin is fixed on the second drive frame, and the second pin is slidably arranged inside the second slide groove.

[0009] Furthermore, an arc-shaped slide groove centered on the center wheel is provided on the workbench on the other side of the center wheel, and a connecting rod is slidably provided in the arc-shaped slide groove. An upper bracket radially arranged along the arc-shaped slide groove is fixed to the top of the connecting rod, and the upper bracket is provided between the center wheel and the arc-shaped slide groove. The third bending wheel is provided at the end of the upper bracket adjacent to the center wheel; the rotary drive is provided at the bottom of the workbench, and the bottom end of the connecting rod is connected to the output shaft of the rotary drive.

[0010] Furthermore, the output shaft of the rotation drive is coaxially arranged with the central axis of the central wheel, and the bottom end of the connecting rod is fixedly connected to the output shaft of the rotation drive via a lower bracket.

[0011] Furthermore, a bending pressure block is movably clamped on the side wall of the third bending wheel adjacent to the center wheel, one side of the bending pressure block is in movably contact with the third bending wheel, and the other side of the bending pressure block is provided with a groove matching the aluminum tube.

[0012] Furthermore, the supporting member includes a slide rail, a clamping block is slidably provided on the top of the slide rail, and a side wall of the clamping block adjacent to the center wheel is provided with a locking groove matching the aluminum tube.

[0013] Furthermore, a positioning block for positioning the end of the aluminum tube is provided on the workbench on the other side of the central wheel.

[0014] The advantages of the present invention are as follows: after the aluminum tube is placed in the space between the support, the center wheel and the first bending wheel, the rotation drive and the telescopic drive are started in sequence, and the aluminum tube can be bent into a finished pedal bracket through the cooperation of the rotating third bending wheel and the moving first bending wheel, the second bending wheel, the second bending block and the first bending block. One-time molding can be achieved, the operation is convenient, the production efficiency can be effectively improved, the production period can be shortened and the production cost can be reduced. Description of the drawings:

[0015] Figure 1 This is a schematic diagram of the pedal bracket structure.

[0016] Figure 2 This is a schematic diagram of the overall structure of Example 1.

[0017] Figure 3 This is a usage status diagram of Example 1.

[0018] Figure 4 for Figure 3 Bottom view of .

[0019] Figure 5 for Figure 3 AA cross-sectional view.

[0020] Figure 6 This is the overall structural diagram of Example 2.

[0021] 1- workbench, 3- rotary drive, 4- center wheel, 5- first bending wheel, 6- second bending wheel, 7- third bending wheel, 8- first bending pressure block, 9- second bending pressure block, 10- support, 11- swing structure, 12- first telescopic rod, 13- second telescopic rod, 14- first sliding seat, 15- first swing arm, 16- first drive frame, 17- first slide, 18- second slide Seat, 19-second slide, 20-second drive frame, 21-second pin, 22-arc slide, 23-connecting rod, 24-upper bracket, 25-lower bracket, 26-bending pressure block, 28-slide rail, 29-block, 30-lock slot, 31-positioning block, 32-first pin, 33-connecting rod, 34-third telescopic rod, 35-electrolytic cell body, 36-tank cover plate, 37-pedal bracket. Specific implementation method:

[0022] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not intended to indicate or imply relative importance.

[0023] Example 1: Figures 2 to 5 As shown, a bending machine for the foot pedal bracket of an electrolytic cell cover plate comprises a workbench 1, a telescopic drive, a rotary drive 3, a center wheel 4, a first bending wheel 5, a second bending wheel 6, a third bending wheel 7, a first bending pressure block 8 and a second bending pressure block 9. A horizontally rotating center wheel 4 is provided at the top center of the workbench 1, and a first bending wheel 5 and a second bending wheel 6 that slide relatively are provided on the workbench 1 on one side of the center wheel 4, and the first bending wheel 5 and the second bending wheel 6 are symmetrically arranged about the center wheel 4; a positioning block 31 for positioning the end of the aluminum tube is provided on the workbench 1 on the other side of the center wheel 4, and the positioning of the aluminum tube can be achieved by placing the end of the aluminum tube against the positioning block 31. A telescopic drive is fixed on the top surface of the workbench 1 to drive the first bending wheel 5 and the second bending wheel 6 to slide relative to each other; the center wheel 4, the first bending wheel 5 and the second bending wheel 6 are arranged in a V shape on the top surface of the workbench 1, which is similar to the overall shape of the pedal bracket.

[0024] A supporting member 10 for supporting the aluminum tube is provided on the workbench 1 between the first bending pressing block 8 and the center wheel 4. The supporting member 10 includes a slide rail 28, a clamping block 29 is slidably provided on the top of the slide rail 28, and a locking groove 30 matching the aluminum tube is provided on the side wall of the clamping block 29 adjacent to the center wheel 4; the clamping block 29 is clamped with the aluminum tube through the locking groove 30, and the clamping block 29 can slide along the slide rail 28 to a position opposite to the center wheel 4, thereby clamping the aluminum tube on the outside of the center wheel 4; the first bending wheel 5 and the center wheel 4 are located on one side of the aluminum tube, and the first bending pressing block 8 and the supporting member 10 are located on the other side of the aluminum tube;

[0025] A first bending pressure block 8 and a second bending pressure block 9 are respectively provided on the workbench 1 on the side adjacent to the center wheel 4 at the end of the travel of the first bending wheel 5 and the second bending wheel 6. The first bending pressure block 8 is fixed on the workbench 1 on one side of the first bending wheel 5. When the first bending wheel 5 is driven downward by the telescopic drive, the corresponding aluminum tube end can be bent by cooperating with the first bending pressure block 8.

[0026] The second bending block 9 is movably arranged on one side of the second bending wheel 6 through the swing structure 11. When the second bending block 9 swings to one side of the second bending wheel 6, the second bending wheel 6 moves upward to bend the corresponding aluminum tube end.

[0027] A third bending wheel 7 that rotates around the center wheel 4 is provided on the workbench 1 on the other side of the center wheel 4. The rotary drive 3 drives the third bending wheel 7 to rotate around the center wheel 4, which can realize the operation of bending the middle part of the aluminum tube. A bending pressure block 26 is movably connected to the side wall of the third bending wheel 7 adjacent to the center wheel 4. One side of the bending pressure block 26 is in movably contact with the third bending wheel 7, and the other side of the bending pressure block 26 is provided with a groove that matches the aluminum tube. The aluminum tube is stuck in the groove of the bending pressure block 26. The bending pressure block 26 is provided between the third bending wheel 7 and the aluminum tube to increase the contact area with the aluminum tube. During the rotation of the third bending wheel 7, the bending pressure block 26 can be pushed to rotate together, and the groove slides along the aluminum tube, and then the aluminum tube is bent by the bending pressure block 26.

[0028] On the workbench 1 on the other side of the center wheel 4, an arcuate chute 22 centered on the center wheel 4 is provided, and a connecting rod 33 is provided to slide in the arcuate chute. An upper bracket 24 arranged radially along the arcuate chute is fixed to the top of the connecting rod 33. The upper bracket 24 is provided between the center wheel 4 and the arcuate chute 22. A third bending wheel 7 is provided at the end of the upper bracket 24 adjacent to the center wheel 4. The rotary drive 3 is provided at the bottom of the workbench 1, and the bottom end of the connecting rod 33 is connected to the output shaft of the rotary drive 3. The rotary drive 3 can be a motor or a rotary hydraulic cylinder. In this embodiment, the rotary drive 3 is a rotary hydraulic cylinder. The rotary drive 3 is provided below the workbench 1, which can reduce the size of the equipment, and the equipment does not occupy the space above the workbench, which is convenient for operation. The output shaft of the rotary drive 3 is coaxial with the central axis of the center wheel 4, and the bottom end of the connecting rod 33 is fixedly connected to the output shaft of the rotary drive 3 through the lower bracket 25. The rotary drive 3 drives the connecting rod 33 to slide in the arc-shaped slide groove 22 through the lower bracket 25. At the same time, the connecting rod 33 can drive the third bending wheel 7 to rotate around the center wheel 4 through the upper bracket 24 to achieve the purpose of bending the middle part of the aluminum tube.

[0029] In this embodiment, the telescopic drive includes a third telescopic rod 34, which is a hydraulic cylinder. The first bending wheel 5 is slidably mounted on the top surface of the workbench 1 via a first sliding seat 14. A first swing arm 15 and a first drive frame 16 are sequentially provided on the top surface of the workbench 1 on the other side of the first bending wheel 5 away from the center wheel 4. The middle portion of the first swing arm 15 is rotatably connected to the workbench 1. First guide slots 17 are provided at both ends of the first swing arm 15. First pins 32 are provided on both the first sliding seat 14 and the first drive frame 16. The first pins 32 slide in adjacent first guide slots 17. The third telescopic rod 34 is fixed to the top surface of the workbench 1, and the arrangement direction of the third telescopic rod 34 is parallel to the sliding direction of the first sliding seat 14. The telescopic end of the third telescopic rod 34 is fixedly connected to the first drive frame 16. In this embodiment, the connecting axis between the first bending wheel 5 and the first sliding seat 14 is the first pin provided on the first sliding seat 14. During the extension and retraction process of the third telescopic rod 34, the first driving frame 16 can be driven to move together, thereby driving the first pin 32 to move. During the movement of the first pin 32, it slides along the first slide groove 17, driving the first swing arm 15 to rotate, and thereby driving the first bending wheel 5 and the first sliding seat 14 to move on the workbench 1.

[0030] The second bending wheel 6 is slidably arranged on the top surface of the workbench 1 through the second sliding seat 18, and the second sliding seat 18 is fixedly connected to the telescopic end of the third telescopic rod 34. During the extension and retraction of the third telescopic rod 34, the second sliding seat 18 and the second bending wheel 6 on its top can be driven to slide on the top surface of the workbench.

[0031] The swing structure 11 includes a swing arm, the middle portion of which is rotatably connected to the workbench 1. The second bending pressure block 9 is fixed to one end of the swing arm, and a second slide groove 19 is provided at the other end of the swing arm. A second drive frame 20 is slidably provided on the workbench 1 between the other end of the swing arm and the third telescopic rod 34. The second drive frame 20 is fixedly connected to the telescopic end of the third telescopic rod 34. A second pin 21 is fixed to the second drive frame 20, and the second pin 21 is slidably set inside the second slide groove 19. The third telescopic rod 34 can drive the second drive frame 20 to slide down along the movement of the second bending wheel 6. During this process, the second pin 21 fixed to the second drive frame 20 slides along the second slide groove 19, thereby driving the swing arm to rotate around the hinge axis between it and the workbench, thereby controlling the second bending pressure block 9 to approach or move away from the second bending wheel 6.

[0032] Instructions for use:

[0033] (1) Preparation

[0034] First, place the aluminum tube between the center wheel and the slide rail 28, and place the left end of the aluminum tube against the positioning block 31;

[0035] Next, slide the clamping block 29 along the slide rail 28 to the left end, clamp the aluminum tube between the clamping block 29 and the center wheel 4; and clamp the bending pressing block 26 between the third bending wheel 7 and the center wheel 4;

[0036] (2) Bending process

[0037] First, the rotary drive 3 is started. The rotary drive 3 drives the third bending wheel 7 to rotate around the central wheel 4 through the lower bracket 25, the connecting rod 33 and the upper bracket 24. During this process, the middle part of the aluminum tube is bent by the bending block 26, so that the aluminum tube is V-shaped as a whole. At the same time, the left end of the aluminum tube is pressed between the second bending wheel 6 and the second bending block 9.

[0038] Then, the piston rod of the third telescopic rod 34 is controlled to retract. On the one hand, the first bending wheel 5 and the first sliding seat 14 are pushed outward through the cooperation of the first driving frame 16, the first pin 32, the first slide groove 17 and the first swing arm 15, and the right end of the aluminum tube is bent with the cooperation of the first bending pressing block 8; on the other hand, the second bending wheel 6 is pushed outward through the second sliding seat 18, and at the same time, the second bending pressing block 9 is pressed toward the left end of the aluminum tube through the cooperation of the second driving frame 20, the second pin 21, the second slide groove 19 and the swing structure 11, and cooperates with the second bending wheel 6 to bend the left end of the aluminum tube;

[0039] Finally, the piston rod of the third telescopic rod 34 and the third bending wheel 7 are controlled to reset, and the bent pedal bracket is manually removed.

[0040] Example 2: Its overall structure is the same as that of Example 1, except that Figure 6 As shown, the telescopic drive includes a first telescopic rod 12 and a second telescopic rod 13. The first telescopic rod 12 for driving the first bending wheel 5 to move is fixed on the top surface of the workbench 1, and the second telescopic rod 13 for driving the second bending wheel 6 to move is fixed on the top surface of the workbench 1. In this embodiment, the first telescopic rod 12 and the second telescopic rod 13 are both hydraulic cylinders, and the cylinder bodies of the first telescopic rod 12 and the second telescopic rod 13 are fixed on the top surface of the workbench 1. The top ends of the piston rods of the first telescopic rod 12 and the second telescopic rod 13 are respectively fixed to the axles of the first bending wheel 5 and the second bending wheel 6, thereby realizing the separate driving of the first bending wheel 5 and the second bending wheel 6. The swing structure 11 includes a swing arm, the middle part of which is rotatably connected to the workbench 1, the second bending pressure block 9 is fixed to one end of the swing arm, and the other end of the swing arm is hinged to the telescopic end of the second telescopic rod 13 through a connecting rod 23. When the second telescopic rod 13 is extended, the connecting rod 23 pushes the swing structure 11 to rotate counterclockwise around the connecting axis between the second telescopic rod 13 and the workbench, thereby pressing the second bending block 9 downward.

[0041] The first bending wheel 5 and the second bending wheel 6 are controlled separately by the first telescopic rod 12 and the second telescopic rod 13, respectively, and are easy to operate. In this embodiment, the first telescopic rod 12 and the second telescopic rod 13 are both hydraulic cylinders.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bending machine for the foot pedal bracket of an electrolytic cell cover plate, characterized in that: It includes a workbench, a telescopic drive, a rotary drive, a center wheel, a first bending wheel, a second bending wheel, a third bending wheel, a first bending pressing block and a second bending pressing block. A horizontally rotating center wheel is provided at the center of the top of the workbench, and the first bending wheel and the second bending wheel are provided on the workbench on one side of the center wheel so as to slide relative to each other, and the first bending wheel and the second bending wheel are symmetrically arranged with respect to the center wheel; the telescopic drive for driving the first bending wheel and the second bending wheel to slide relative to each other is fixed on the top surface of the workbench; A first bending pressing block and a second bending pressing block are respectively provided on the workbench at the end of the travel of the first bending wheel and the second bending wheel and on the side adjacent to the center wheel. The first bending pressing block is fixed to the workbench on one side of the first bending wheel. A supporting member for supporting the aluminum tube is provided on the workbench between the first bending pressing block and the center wheel. The second bending pressing block is movably provided on one side of the second bending wheel through a swing structure. The third bending wheel rotating around the center wheel is provided on the workbench on the other side of the center wheel, and the rotary drive drives the third bending wheel to rotate around the center wheel.

2. The electrolytic cell cover plate foot pedal bracket bending machine according to claim 1, characterized in that: The telescopic drive includes a first telescopic rod and a second telescopic rod. The first telescopic rod for driving the first bending wheel to move is fixed on the top surface of the workbench, and the second telescopic rod for driving the second bending wheel to move is fixed on the top surface of the workbench.

3. The electrolytic cell cover plate footboard bracket bending machine according to claim 2, characterized in that: The swing structure includes a swing arm, the middle part of which is rotatably connected to the workbench, the second bending pressure block is fixed to one end of the swing arm, and the other end of the swing arm is hinged to the telescopic end of the second telescopic rod through a connecting rod.

4. The electrolytic cell cover plate footboard bracket bending machine according to claim 1, characterized in that: The telescopic drive includes a third telescopic rod, the first bending wheel is slidably arranged on the top surface of the workbench through a first sliding seat, and a first swing arm and a first driving frame are sequentially provided on the top surface of the workbench on the other side of the first bending wheel away from the center wheel, the middle part of the first swing arm is rotatably connected to the workbench, and a first sliding groove is provided at both ends of the first swing arm, and a first pin is provided on the first sliding seat and the first driving frame, and the first pin is slidably arranged in the adjacent first sliding groove; the third telescopic rod is fixed to the top surface of the workbench, and the arrangement direction of the third telescopic rod is parallel to the sliding direction of the first sliding seat; the telescopic end of the third telescopic rod is fixedly connected to the first driving frame; the second bending wheel is slidably arranged on the top surface of the workbench through a second sliding seat, and the second sliding seat is fixedly connected to the telescopic end of the third telescopic rod.

5. The electrolytic cell cover plate footboard bracket bending machine according to claim 4, characterized in that: The swing structure includes a swing arm, the middle part of the swing arm is rotatably connected to the workbench, the second bending pressure block is fixed to one end of the swing arm, and the other end of the swing arm is provided with a second slide groove. A second drive frame is slidably provided on the workbench between the other end of the swing arm and the third telescopic rod, and the second drive frame is fixedly connected to the telescopic end of the third telescopic rod; a second pin is fixed on the second drive frame, and the second pin is slidably arranged inside the second slide groove.

6. The electrolytic cell cover plate footboard bracket bending machine according to claim 1, characterized in that: An arc-shaped slide centered on the center wheel is provided on the workbench on the other side of the center wheel, and a connecting rod is slidably provided in the arc-shaped slide. An upper bracket radially arranged along the arc-shaped slide is fixed to the top of the connecting rod, and the upper bracket is provided between the center wheel and the arc-shaped slide. The third bending wheel is provided at the end of the upper bracket adjacent to the center wheel; the rotary drive is provided at the bottom of the workbench, and the bottom end of the connecting rod is connected to the output shaft of the rotary drive.

7. The electrolytic cell cover plate footboard bracket bending machine according to claim 6, characterized in that: The output shaft of the rotation drive is coaxially arranged with the central axis of the central wheel, and the bottom end of the connecting rod is fixedly connected to the output shaft of the rotation drive via a lower bracket.

8. The electrolytic cell cover plate footboard bracket bending machine according to any one of claims 1 to 7, characterized in that: A bending pressure block is movably clamped on the side wall of the third bending wheel adjacent to the central wheel. One side of the bending pressure block is in movably contact with the third bending wheel, and the other side of the bending pressure block is provided with a groove matching the aluminum tube.

9. The electrolytic cell cover plate footboard bracket bending machine according to any one of claims 1 to 7, characterized in that: The supporting member includes a slide rail, a clamping block is slidably provided on the top of the slide rail, and a side wall of the clamping block adjacent to the central wheel is provided with a locking groove matching the aluminum tube.

10. The electrolytic cell cover plate footboard bracket bending machine according to any one of claims 1 to 7, characterized in that: A positioning block for positioning the end of the aluminum tube is provided on the workbench on the other side of the center wheel.

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