A packaging device for copper wire coils

Abstract

This utility model relates to the field of copper coil production equipment, and discloses a packaging device for copper wire coils, including a frame, a winding unit, a support unit, a fixed platform, a conveying unit, and a transfer unit. The frame has a first direction and a second direction. The winding unit is rotatably connected to the frame, and the support unit is slidably connected to the frame. The support unit is used to move the copper wire coil into the winding unit. The fixed platform is disposed at one end of the frame along the first direction. The conveying unit is slidably connected to the fixed platform and is movable along the second direction. The conveying unit is used to store the copper wire coil. The transfer unit is slidably connected to the fixed platform and is used to move the copper wire coil from the conveying unit to the support unit. This packaging device can improve efficiency.

Description

Technical Field

[0001] This utility model relates to the field of copper coil production equipment, and in particular to a packaging device for copper wire coils. Background Technology

[0002] After production, copper wire is wound into coils by a winding mechanism for storage and transportation. To prevent oxidation or wear, a wrapping film needs to be wrapped around the outer surface of the copper wire coils. A stretch wrapping machine is typically used for this task. However, moving the copper wire coils to the machine requires a crane to move them closer, and then workers manually push each coil into the machine. This method is labor-intensive and inefficient.

[0003] The technical problem that this invention aims to solve is: how to improve the efficiency of copper wire coil wrapping packaging film. Utility Model Content

[0004] The main objective of this invention is to provide a packaging device for copper wire coils. By setting up a conveying unit, a transfer unit, and a support unit, workers can use a crane to place multiple copper wire coils onto the conveying unit at once. The transfer unit then places the copper wire coils from the conveying unit onto the support unit one by one. The support unit then moves the copper wire coils to the winding unit for wrapping with packaging film. In this way, multiple copper wire coils can be continuously wrapped with packaging film without the need for workers to move the copper wire coils, reducing the labor intensity of workers and improving packaging efficiency.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] A packaging device for copper wire coils includes a frame, a winding unit, a support unit, a fixing platform, a conveying unit, and a transfer unit. The frame has a first direction and a second direction. The winding unit is rotatably connected to the frame, and the support unit is slidably connected to the frame. The support unit is used to move the copper wire coil into the winding unit. The fixing platform is disposed at one end of the frame along the first direction. The conveying unit is slidably connected to the fixing platform and is movable along the second direction. The conveying unit is used to store the copper wire coil. The transfer unit is slidably connected to the fixing platform and is used to move the copper wire coil from the conveying unit to the support unit.

[0007] Preferably, the conveying unit includes a sliding frame and a first drive module; the sliding frame is slidably connected to the fixed platform, the first drive module is connected to the fixed platform, the first drive module is used to drive the sliding frame to move along a second direction, the sliding frame is provided with oppositely arranged first rollers, the first rollers are rotatably connected to the sliding frame, the axial direction of the first rollers extends along the second direction, and the two first rollers are used to support the copper wire coil.

[0008] Preferably, the fixed platform is provided with a first baffle, and two first baffles are respectively disposed on both sides of the sliding frame. The first baffles are used to prevent the copper wire coil from falling off the sliding frame.

[0009] Preferably, the transfer unit includes a second drive module, a movable frame, a third drive module, and a clamping module. The movable frame is slidably connected to the fixed platform, the second drive module is connected to the fixed platform, and the second drive module is used to drive the movable frame to move along a second direction. The clamping module is slidably connected to the movable frame and is used to abut against the inner ring of the copper wire coil. The third drive module is used to drive the clamping module to move along a first direction.

[0010] Preferably, the clamping module includes a mounting plate, sliding blocks, a bidirectional lead screw, a first motor, and a second roller. The mounting plate is slidably connected to the movable frame. The two sliding blocks are respectively connected to the two ends of the bidirectional lead screw. The bidirectional lead screw is rotatably connected to the mounting plate and is used to drive the two sliding blocks to move closer or further apart. The first motor is connected to the mounting plate, and the power output end of the first motor is fixedly connected to the end of the bidirectional lead screw. The first motor is used to drive the bidirectional lead screw to rotate. The second roller is rotatably connected to the sliding blocks, and the axial direction of the second roller extends along a second direction.

[0011] Preferably, the support unit includes a support platform, a fourth drive module, a third roller, a fifth drive module, and a lifting roller module. The support platform is slidably connected to the frame, the fourth drive module is connected to the frame, and the fourth drive module is used to drive the support platform to move along a first direction. The third roller is rotatably connected to the support platform, the fifth drive module is connected to the support platform, and the fifth drive module is used to drive the third roller to rotate. The lifting roller module is slidably connected to the support platform, and a space for supporting the copper wire coil is formed between the third roller and the lifting roller module.

[0012] Preferably, the lifting roller module includes a second motor, a fourth roller, a lifting rod, and multiple gears. The lifting rod is slidably connected to the support platform. The two ends of the fourth roller are rotatably connected to the two lifting rods respectively. The multiple gears are rotatably connected to the support platform respectively, and the multiple gears are located on both sides of the lifting rod. The gears mesh with the lifting rod. The power output end of the second motor is fixedly connected to one of the gears. The second motor is used to drive the gear to rotate so as to drive the lifting rod to move up and down.

[0013] Preferably, the fixed platform is provided with a transition boss, which facilitates the copper wire roll on the conveying unit to roll onto the support unit, and the transition boss is provided with a second baffle on both sides along the first direction.

[0014] Compared with existing technologies, this solution has the following advantages:

[0015] The copper wire coil packaging device in this case, by setting up a conveying unit, a transfer unit, and a support unit, allows workers to use an overhead crane to place multiple copper wire coils onto the conveying unit at once. The transfer unit then places the copper wire coils from the conveying unit onto the support unit one by one. The support unit then moves the copper wire coils to the winding unit for wrapping with packaging film. The overhead crane can transport multiple copper wire coils at once, reducing the frequency of its use. Moreover, by using the transfer unit to move the copper wire coils from the conveying unit to the support unit, replacing manual handling, this method can reduce the labor intensity of workers and improve the loading efficiency of copper wire coils, thereby improving the packaging efficiency of copper wire coils. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the packaging device for the copper wire coil in Example 1;

[0017] Figure 2 As in Example 1 Figure 1 Enlarged view of A in the middle;

[0018] Figure 3 This is a top view of the packaging apparatus for the copper wire coil of Example 1;

[0019] Figure 4 This is a schematic diagram of the support unit in Example 1;

[0020] Figure 5 This is a schematic diagram of the packaging device (containing copper wire coil) for the copper wire coil of Example 1.

[0021] The components include: frame 1; winding unit 2; support unit 3; fixed platform 4; conveying unit 5; transfer unit 6; rotating ring 21; support wheel 22; cutter module 23; support platform 31; fourth drive module 32; third roller 33; fifth drive module 34; lifting roller module 35; first baffle 41; transition boss 42; second baffle 43; sliding frame 51; first drive module 52; first roller 53; second drive module 61; moving frame 62; third drive module 63; clamping module 64; stop bar 311; second motor 351; fourth roller 352; lifting rod 353; gear 354; mounting plate 641; sliding block 642; bidirectional lead screw 643; first motor 644; and second roller 645. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of this application implemented as described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Example 1

[0024] refer to Figure 1-5 A packaging device for copper wire coils includes a frame 1, a winding unit 2, a support unit 3, a fixing platform 4, a conveying unit 5, and a transfer unit 6. The frame 1 has a first direction and a second direction. The winding unit 2 is rotatably connected to the frame 1. The support unit 3 is slidably connected to the frame 1 and is used to move the copper wire coil into the winding unit 2. The fixing platform 4 is disposed at one end of the frame 1 along the first direction. The conveying unit 5 is slidably connected to the fixing platform 4 and is movable along the second direction. The conveying unit 5 is used to store the copper wire coil. The transfer unit 6 is slidably connected to the fixing platform 4 and is used to move the copper wire coil on the conveying unit 5 to the support unit 3.

[0025] In this embodiment, the winding unit 2 is existing technology. The winding unit 2 includes a rotating ring 21, a motor, support wheels 22, and a cutter module 23. Multiple support wheels 22 are rotatably connected to the frame 1. The rotating ring 21 is mounted on the multiple support wheels 22 and is in contact with the multiple support wheels 22. The motor drives one of the support wheels 22 to rotate, thereby driving the rotating ring 21 to rotate on the support wheel 22. The rotating ring 21 has a notch and a packaging film. The copper wire coil passes through the notch and the free end of the packaging film is connected to the copper wire coil. The rotating ring 21 rotates, thereby driving the packaging film to wrap around the outer surface of the copper wire coil.

[0026] The cutting module 23 includes a cylinder and a cutting blade. After the copper wire coil is wound with the packaging film, the cylinder drives the cutting blade to move toward the packaging film on the copper wire coil, thereby cutting the packaging film.

[0027] The first direction is the conveying direction in which the copper wire coil moves to the winding unit 2, and the first direction and the second direction are perpendicular.

[0028] Along the first direction, the fixed platform 4 is set at one end of the frame 1, or it can be said that the fixed platform 4 is set at the feeding end of the frame 1.

[0029] The specific workflow of this packaging device is as follows: Workers place multiple copper wire coils onto the conveying unit 5 using a gantry crane. The conveying unit 5 moves the copper wire coils along a second direction, aligning the outermost copper wire coil with the support unit 3. The support unit 3 moves along a first direction and approaches the fixed platform 4. The transfer unit 6 inserts into the inner ring of the outermost copper wire coil in the conveying unit 5, causing the copper wire coil to roll onto the support unit 3. The transfer unit 6 moves along a second direction, thus exiting the inner ring of the copper wire coil. The support unit 3 moves the copper wire coil to the winding unit 2, where the winding unit 2 wraps a packaging film around the outer surface of the copper wire coil. After winding, the cutter module 23 cuts the packaging film. The support unit 3 moves the packaged copper wire coil to the next process, where workers remove the packaged copper wire coil. This cycle repeats, with the support unit 3 continuing to move to the fixed platform 4 for the next copper wire coil packaging.

[0030] It should be noted that the winding unit 2, support unit 3, conveying unit 5, and transfer unit 6 are all controlled by a PLC to realize the above timing steps.

[0031] Preferably, the conveying unit 5 includes a sliding frame 51 and a first drive module 52; the sliding frame 51 is slidably connected to the fixed platform 4, the first drive module 52 is connected to the fixed platform 4, the first drive module 52 is used to drive the sliding frame 51 to move along the second direction, the sliding frame 51 is provided with oppositely arranged first rollers 53, the first rollers 53 are rotatably connected to the sliding frame 51, the axial direction of the first rollers 53 extends along the second direction, and the two first rollers 53 are used to support the copper wire coil.

[0032] In this embodiment, the first roller 53 extends along the second direction, so that the copper wire coil is placed in the same orientation as when it is packaged, which facilitates transportation.

[0033] The sliding frame 51 is slidably connected to the fixed platform 4 via a slide rail. The first drive module 52 is a lead screw motor. The sliding frame 51 is connected to the lead screw. The motor drives the lead screw to rotate, thereby driving the sliding frame 51 to move along the second direction.

[0034] Workers use a gantry crane to place multiple copper wire coils onto the two first rollers 53 of the sliding frame 51. The first drive module 52 drives the sliding frame 51 to move along the second direction, aligning the outermost copper wire coils on the sliding frame 51 with the support unit 3.

[0035] Preferably, the fixed platform 4 is provided with a first baffle 41, and two first baffles 41 are respectively disposed on both sides of the sliding frame 51. The first baffles 41 are used to prevent the copper wire coil from falling off the sliding frame 51.

[0036] In this embodiment, the first baffle 41 extends along the second direction to one side of the support unit 3, thereby forming a discharge port so that the copper wire coil can only enter the support unit 3 from the position of the discharge port.

[0037] Preferably, the transfer unit 6 includes a second drive module 61, a movable frame 62, a third drive module 63, and a clamping module 64. The movable frame 62 is slidably connected to the fixed platform 4. The second drive module 61 is connected to the fixed platform 4 and is used to drive the movable frame 62 to move along a second direction. The clamping module 64 is slidably connected to the movable frame 62 and is used to abut against the inner ring of the copper wire coil. The third drive module 63 is used to drive the clamping module 64 to move along a first direction.

[0038] In this embodiment, the conveying unit 5 and the movable frame 62 are arranged sequentially on the fixed platform 4 along the second direction. The movable frame 62 is slidably connected to the fixed platform 4 via a slide rail.

[0039] The specific workflow of the transfer unit 6 is as follows: After the conveying unit 5 aligns the outermost copper wire coil with the support unit 3, the second drive module 61 drives the moving frame 62 to move away from the conveying unit 5 so that the clamping module 64 will not collide with the copper wire coil. The third drive module 63 drives the clamping module 64 to move along the first direction so that the clamping module 64 is aligned with the inner circle of the copper wire coil of the conveying unit 5. The second drive module 61 then drives the moving frame 62 to move toward the copper wire coil so that the clamping module 64 extends into the inner circle of the copper wire coil. The clamping module 64 is activated and contacts the inner circle of the copper wire coil. The third drive module 63 drives the clamping module 64 to move toward the support unit 3, thereby causing the copper wire coil to roll onto the support unit 3. After the copper wire coil is on the support unit 3, the clamping module 64 releases contact with the inner circle of the copper wire coil. The second drive module 61 drives the moving frame 62 to move away from the copper wire coil so that the clamping module 64 is detached from the inner circle of the copper wire coil. The support unit 3 then moves the copper wire coil to the winding unit 2 for packaging.

[0040] Both the second drive module 61 and the third drive module 63 are lead screw motors.

[0041] Preferably, the clamping module 64 includes a mounting plate 641, a sliding block 642, a bidirectional lead screw 643, a first motor 644, and a second roller 645. The mounting plate 641 is slidably connected to the movable frame 62. The two sliding blocks 642 are respectively connected to the two ends of the bidirectional lead screw 643. The bidirectional lead screw 643 is rotatably connected to the mounting plate 641. The bidirectional lead screw 643 is used to drive the two sliding blocks 642 to move closer or further apart. The first motor 644 is connected to the mounting plate 641. The power output end of the first motor 644 is fixedly connected to the end of the bidirectional lead screw 643. The first motor 644 is used to drive the bidirectional lead screw 643 to rotate. The second roller 645 is rotatably connected to the sliding block 642. The axial direction of the second roller 645 extends along a second direction.

[0042] In this embodiment, the two ends of the bidirectional lead screw 643 are respectively positive and negative threads, and two sliding blocks 642 are connected to the two ends of the bidirectional lead screw 643. When the bidirectional lead screw 643 rotates, the two sliding blocks 642 will move closer to each other or further away from each other.

[0043] The specific working process of the clamping module 64 is as follows: When the second drive module 61 drives the moving frame 62 to move toward the copper wire coil, so that the second roller 645 is located in the inner circle of the copper wire coil, the first motor 644 drives the bidirectional lead screw 643 to rotate, so that the two sliding blocks 642 move away from each other, and then the two second rollers 645 contact the inner circle of the copper wire coil to complete the clamping of the copper wire coil. The third drive module 63 drives the mounting plate 641 to move toward the support unit 3, so that the second roller 645 drives the copper wire coil to roll onto the support unit 3. Since the second roller 645 is rotatably connected to the sliding block 642, the copper wire coil can roll, thus avoiding wear on the copper wire coil.

[0044] When the clamping module 64 needs to release the clamp on the copper wire coil, the first motor 644 drives the bidirectional lead screw 643 to rotate, causing the two sliding blocks 642 to move closer to each other, thereby separating the two second rollers 645 from the inner ring of the copper wire coil, thus releasing the clamp on the copper wire coil. The third drive module 63 drives the mounting plate 641 to move away from the support unit 3, so as to avoid affecting the support unit 3 in moving the copper wire coil to the winding unit 2.

[0045] Preferably, the support unit 3 includes a support platform 31, a fourth drive module 32, a third roller 33, a fifth drive module 34, and a lifting roller module 35. The support platform 31 is slidably connected to the frame 1. The fourth drive module 32 is connected to the frame 1 and is used to drive the support platform 31 to move along a first direction. The third roller 33 is rotatably connected to the support platform 31. The fifth drive module 34 is connected to the support platform 31 and is used to drive the third roller 33 to rotate. The lifting roller module 35 is slidably connected to the support platform 31. A space for supporting the copper wire coil is formed between the third roller 33 and the lifting roller module 35.

[0046] In this embodiment, the third roller 33 extends axially along the second direction, the lifting roller module 35 is used to block the copper wire coil and prevent the copper wire coil from continuing to move after reaching the support unit 3 due to inertia, and the support platform 31 is slidably connected to the frame 1 through the slide rail.

[0047] The specific workflow of support unit 3 is as follows: the fourth drive module 32 drives the support platform 31 to move to one side of the fixed platform 4, the lifting roller module 35 moves upward, and the transfer unit 6 drives the copper wire roll of the conveying unit 5 to roll onto the third roller 33 and the lifting roller module 35 on the support platform 31. The lifting roller module 35 works with the transfer unit 6 to prevent the copper wire roll from detaching from the third roller 33 and the lifting roller module 35 due to inertia during the rolling process. After the copper wire roll is placed on the third roller 33 and the lifting roller module 35, the fourth drive module 32 drives the support platform 31 to move onto the winding unit 2, and the lifting roller module 35 moves downward so that the lifting roller module 35 and the third roller 33 are on the same plane. The fifth drive module 34 drives the third roller 33 to rotate, so that the copper wire roll can rotate around its own axis when winding the packaging film, thereby allowing the packaging film to continuously wrap around the surface of the copper wire roll.

[0048] By setting up the lifting roller module 35, the copper wire coil can be further prevented from detaching from the support unit 3, thus improving safety.

[0049] Furthermore, the support platform 31 is provided with baffles 311 symmetrically arranged along the first direction. The baffles 311 can ensure that the copper wire coil will not detach from the third roller 33 and the lifting roller module 35 when it rotates on the third roller 33.

[0050] Preferably, the lifting roller module 35 includes a second motor 351, a fourth roller 352, a lifting rod 353, and a plurality of gears 354. The lifting rod 353 is slidably connected to the support platform 31. The two ends of the fourth roller 352 are rotatably connected to two of the lifting rods 353 respectively. The plurality of gears 354 are rotatably connected to the support platform 31 respectively, and the plurality of gears 354 are located on both sides of the lifting rod 353. The gears 354 mesh with the lifting rod 353. The power output end of the second motor 351 is fixedly connected to one of the gears 354. The second motor 351 is used to drive the gear 354 to rotate so as to drive the lifting rod 353 to move up and down.

[0051] In this embodiment, the lifting rod 353 is slidably connected to the support platform 31 via a slide rail, and the lifting rod 353 extends vertically along its length. The support platform 31 is slidably connected to both sides of the lifting rod 353 along the first direction, and gears 354 are connected to both sides of the lifting rod 353, meshing with the lifting rod 353 and the gears 354. The gear 354 fixedly connected to the power output end of the motor serves as the driving gear 354, and the other gears 354 serve as auxiliary gears 354.

[0052] When it is necessary to block the copper wire coil, the motor drives the drive gear 354 to rotate, which in turn drives the lifting rod 353 to move upward, so that the height of the fourth roller 352 is higher than the height of the third roller 33, thereby achieving the blocking effect on the copper wire coil. The other auxiliary gears 354 are for the lifting rod 353 to maintain stable movement when rising or falling.

[0053] When there is no need to block the copper wire coil, the motor drives the drive gear 354 to rotate, thereby moving the lifting rod 353 downward to the initial position. At this time, the fourth roller 352 is at the same height as the third roller 33, and the bottom of the lifting rod 353 contacts the support platform 31, thereby increasing the support force of the fourth roller 352 and preventing the lifting rod 353 from being suspended in the air for a long time, which would affect the structural stability of the lifting roller module 35.

[0054] Preferably, the fixed platform 4 is provided with a transition boss 42, which facilitates the copper wire roll on the conveying unit 5 to roll onto the support unit 3. The transition boss 42 is provided with a second baffle 43 on both sides along the first direction.

[0055] In this embodiment, a transition boss 42 is provided on the fixed platform 4. The upper surface of the transition boss 42, the top end of the first roller 53, and the top end of the third roller 33 are on the same plane. When the transfer unit 6 drives the copper wire coil to roll from the conveying unit 5 to the support unit 3, by providing the transition boss 42, the position passed through during the rolling process can be at the same height, which improves the smoothness of the copper wire coil rolling. In addition, second baffles 43 are provided on both sides of the transition boss 42 to prevent the copper wire coil from detaching from the transition boss 42 during the rolling process.

[0056] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A packing device for copper wire coils, characterized in that, The device includes a frame, a winding unit, a support unit, a fixing platform, a conveying unit, and a transfer unit. The frame has a first direction and a second direction. The winding unit is rotatably connected to the frame, and the support unit is slidably connected to the frame. The support unit is used to move copper wire coils into the winding unit. The fixing platform is located at one end of the frame along the first direction. The conveying unit is slidably connected to the fixing platform and is movable along the second direction. The conveying unit is used to store copper wire coils. The transfer unit is slidably connected to the fixing platform and is used to move copper wire coils from the conveying unit to the support unit.

2. The device for packaging of copper wire coils according to claim 1, characterized in that, The conveying unit includes a sliding frame and a first drive module; the sliding frame is slidably connected to the fixed platform, and the first drive module is connected to the fixed platform. The first drive module is used to drive the sliding frame to move along a second direction. The sliding frame is provided with oppositely arranged first rollers, which are rotatably connected to the sliding frame. The axial direction of the first rollers extends along the second direction, and the two first rollers are used to support the copper wire coil.

3. The device for packaging of copper wire coils according to claim 2, characterized in that, The fixed platform is provided with a first baffle, and two first baffles are respectively arranged on both sides of the sliding frame. The first baffles are used to prevent the copper wire coil from falling off the sliding frame.

4. The package of copper wire coils according to claim 1, characterized in that, The transfer unit includes a second drive module, a moving frame, a third drive module, and a clamping module. The moving frame is slidably connected to the fixed platform. The second drive module is connected to the fixed platform and is used to drive the moving frame to move along a second direction. The clamping module is slidably connected to the moving frame and is used to abut against the inner ring of the copper wire coil. The third drive module is used to drive the clamping module to move along a first direction.

5. The package of copper wire coils according to claim 4, characterized in that The clamping module includes a mounting plate, sliding blocks, a bidirectional lead screw, a first motor, and a second roller. The mounting plate is slidably connected to the movable frame. The two sliding blocks are respectively connected to the two ends of the bidirectional lead screw. The bidirectional lead screw is rotatably connected to the mounting plate and is used to drive the two sliding blocks to move closer or further apart. The first motor is connected to the mounting plate, and the power output end of the first motor is fixedly connected to the end of the bidirectional lead screw. The first motor is used to drive the bidirectional lead screw to rotate. The second roller is rotatably connected to the sliding blocks, and the axial direction of the second roller extends along a second direction.

6. The package of copper wire coils according to claim 1, characterized in that, The support unit includes a support platform, a fourth drive module, a third roller, a fifth drive module, and a lifting roller module. The support platform is slidably connected to the frame, the fourth drive module is connected to the frame, and the fourth drive module is used to drive the support platform to move along a first direction. The third roller is rotatably connected to the support platform, the fifth drive module is connected to the support platform, and the fifth drive module is used to drive the third roller to rotate. The lifting roller module is slidably connected to the support platform, and a space for supporting the copper wire coil is formed between the third roller and the lifting roller module.

7. The device for packaging of copper wire coils according to claim 6, characterized in that, The lifting roller module includes a second motor, a fourth roller, a lifting rod, and multiple gears. The lifting rod is slidably connected to the support platform. The two ends of the fourth roller are rotatably connected to the two lifting rods respectively. The multiple gears are rotatably connected to the support platform and are located on both sides of the lifting rod. The gears mesh with the lifting rod. The power output end of the second motor is fixedly connected to one of the gears. The second motor is used to drive the gear to rotate, thereby driving the lifting rod to move up and down.

8. The packaging apparatus for copper wire coils according to claim 1, characterized in that, The fixed platform is provided with a transition boss, which facilitates the copper wire roll on the conveying unit to roll onto the support unit. The transition boss is provided with a second baffle on both sides along the first direction.

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