A double-sided deburring device

Abstract

The application relates to the technical field of numerical control machine tool processing, and particularly discloses a double-sided deburring device which comprises a first conveying part, a second conveying part, a first clamping part, a second clamping part, a first brush and a second brush, the first conveying part and the second conveying part are oppositely arranged, the first clamping part is fixedly connected to the first conveying part, the second clamping part is fixedly connected to the second conveying part, the first clamping part and the second clamping part are both used for clamping parts to be processed, the first brush is arranged opposite to the first conveying part, and the second brush is arranged opposite to the second conveying part. The application has the effect of expanding the application range of the double-sided deburring device.

Description

Technical Field

[0001] This application relates to the field of CNC machine tool processing technology, and in particular to a double-sided deburring device. Background Technology

[0002] During CNC machine tool processing, when the CNC machine tool performs cutting operations on the product, burrs will appear on the surface of the finished product due to the material of the product itself and the errors that exist in the processing.

[0003] Products with burrs can easily cause injury to workers during transportation. At the same time, burrs on products can affect the stability of combined devices and reduce the accuracy of device use.

[0004] In the traditional process of removing burrs from the surface of a product, the product needs to be flipped over to remove burrs from both sides. As in the authorized patent CN113787400A, the product is flipped using a U-shaped flipping structure. However, the volume of this flipping structure is greatly affected by the shape and length of the product, which limits the applicability of the double-sided deburring device. Summary of the Invention

[0005] In order to expand the application scope of the double-sided deburring device, this application provides a double-sided deburring device.

[0006] The double-sided deburring device provided in this application adopts the following technical solution:

[0007] A double-sided deburring device includes a first transport section, a second transport section, a first clamping section, a second clamping section, a first brush, and a second brush. The first transport section and the second transport section are arranged opposite to each other. The first clamping section is fixedly connected to the first transport section, and the second clamping section is fixedly connected to the second transport section. Both the first clamping section and the second clamping section are used to clamp the parts to be processed. The first brush is positioned facing the first transport section, and the second brush is positioned facing the second transport section.

[0008] By adopting the above technical solution, the part to be processed is first placed in the first transport section and clamped by the first clamping section, thereby removing burrs from one end of the part by the first brush. The first clamping section releases the part after processing at one end, and the part is transported to the second transport section and clamped by the second clamping section. The second brush processes the other end of the part on the second transport section, removing burrs from that end, thus completing the double-sided burr removal. The double-sided deburring device removes burrs without requiring the part to be flipped during use, making its size unaffected by the length of the part, thereby expanding its application range.

[0009] Optionally, the first transport unit includes a first transport belt and a second transport belt, the first clamping part is fixedly connected to the second transport belt, and the first clamping part can control the start and stop of the second transport belt.

[0010] By adopting the above technical solution, the start and stop of the second conveyor belt are controlled by the first clamping part. When the first conveyor belt transports the part to be processed to the second conveyor belt, the second conveyor belt remains stationary. The second conveyor belt only starts to transport after the part to be processed is clamped by the first clamping part on the second conveyor belt, ensuring that the part transported to the second conveyor belt can be clamped by the first clamping part.

[0011] Optionally, the first clamping part includes a first clamping plate, a second clamping plate, a trigger rod, and a clamping spring. The first clamping plate and the second clamping plate are fixedly connected to the two ends of the trigger rod, and the two ends of the clamping spring are fixedly connected to the first clamping plate and the second clamping plate. The clamping spring can shorten the distance between the first clamping plate and the second clamping plate.

[0012] By adopting the above technical solution, when the workpiece touches the trigger rod, the clamping spring shortens the distance between the first clamping plate and the second clamping plate, so that the first clamping plate and the second clamping plate can clamp the workpiece, thereby facilitating the removal of burrs on the surface of the workpiece.

[0013] Optionally, the trigger rod includes a first locking rod, a second locking rod, and an abutment rod. The first locking rod is hinged to the second locking rod at one end, and the abutment rod is connected at the hinge of the first and second locking rods. The abutment rod is connected to a trigger switch, which is used to control the movement of the second conveyor belt.

[0014] By adopting the above technical solution, after the workpiece is transported onto the second conveyor belt, it abuts against the abutment rod, causing the first and second clamping rods to bend in the direction of the workpiece, thereby clamping the workpiece between the first and second clamping plates. Simultaneously, the workpiece abuts against the abutment rod and abuts against the trigger switch, which controls the movement of the second conveyor belt. This ensures that the first and second clamping parts can immediately transport the workpiece after clamping it, thus accelerating the processing speed.

[0015] Optionally, the first locking rod has a first groove on the side opposite to the clamping spring, and the second locking rod has a second groove on the side opposite to the clamping spring. The second groove is positioned opposite to and communicates with the first groove. A reset spring is connected to the second groove, and the two ends of the reset spring are connected to the bottom of the first groove and the second groove.

[0016] By adopting the above technical solution and setting a return spring, the reset of the trigger rod is facilitated. By creating a first groove and a second groove on the first and second locking rods, the return spring can be placed inside the first and second grooves, restricting the movement position of the return spring and thus facilitating its extension and retraction.

[0017] Optionally, the first locking rod and the second locking rod are slidably connected to a limiting sleeve on the side opposite to the first conveyor belt. The limiting sleeve is hinged to a fixing seat, which is fixedly connected to the second conveyor belt. A rotational clearance is left between the fixing seat and the first locking rod.

[0018] By adopting the above technical solution, the fixed seat is fixedly connected to the second conveyor belt 12, so that the first clamping part can clamp the workpiece to be processed on the second conveyor belt and move with the movement of the second conveyor belt. Furthermore, the limiting sleeve enables the first and second clamping rods to connect with the fixed seat when rotating.

[0019] Optionally, a release mechanism is provided at the end of the second conveyor belt away from the first clamping part. The release mechanism includes an adapter shaft, a rotating motor is coaxially connected to the adapter shaft, and a first gripper and a second gripper are connected to the side of the adapter shaft facing the first conveyor belt. The distance between the first gripper and the second gripper is greater than the width of the fixed seat.

[0020] By adopting the above technical solution, the rotation of the gripper bar causes the first gripper bar to abut against the first locking bar, and the second gripper bar to abut against the second locking bar, thereby causing the first locking bar and the second locking bar to rotate in a direction away from the connection to be processed, so that the trigger bar returns to its rod shape, thereby driving the first clamping plate and the second clamping plate to disengage from the part to be processed, and causing the first clamping part to release the part to be processed.

[0021] Optionally, the second transport unit includes a transport platform, and the transport platform has a transport groove on one side facing the first transport unit along the transport direction of the second transport belt, and the second clamping part is slidably connected to the transport groove.

[0022] By adopting the above technical solution, after the burrs on one side of the part to be processed are removed, the processed side of the part to be processed comes into contact with the transport platform. The second clamping part on the transport platform clamps the part to be processed and transports it away from the first transport part through the transport groove, so that the other end of the part to be processed is separated from the first transport part, thereby removing the burrs on the surface of the other end of the part to be processed.

[0023] Optionally, the second clamping part includes a first clamp and a second clamp, the first clamp and the second clamp are spaced apart, the side of the first clamp away from the first transport part is connected to a drive mechanism, and the second clamp is rubbed against the wall of the transport groove.

[0024] By adopting the above technical solution, the first gripper is driven to move towards the second gripper by the drive mechanism, thereby clamping the workpiece between the first gripper and the second gripper. By causing the second gripper to rub against the wall of the transport groove, the clamping force between the first gripper and the second gripper is the frictional force between the second gripper and the transport groove. The clamping force is provided by the frictional force, thereby reducing the number of drive elements of the second clamping part and thus reducing the production cost of the deburring device.

[0025] Optionally, a third transport section is provided on the side of the second transport section opposite to the first transport section, and the third transport section is positioned opposite the second transport section.

[0026] By adopting the above technical solution, after the burrs at both ends of the part to be processed are removed, the third transportation department can place the processed part to be transported to other places for processing or storage.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. When removing burrs from the surface of a workpiece, the workpiece is placed on a first transport unit and clamped. One side of the workpiece is then processed and removed by a first brush. After the burrs on one side of the workpiece are removed, the burr-free end abuts against a second transport unit and is clamped and transported by a second clamping unit. Then, the burrs on the other side of the workpiece are removed by a second brush. The length of the workpiece does not affect the burr removal process, thus reducing the volume of the double-sided deburring mechanism and expanding its applicability.

[0029] 2. The first clamping part senses whether the workpiece to be processed on the first conveyor belt is transported to the second conveyor belt and clamped by the first clamping plate and the second clamping plate by setting a trigger rod, thereby ensuring that the workpiece to be processed is clamped before the second conveyor belt is started to transport the workpiece to be processed, thus improving the processing accuracy of the workpiece to be processed;

[0030] 3. In the second transport section, the movement of the first and second grippers is restricted by the transport groove opened on the transport platform, so that the workpiece to be processed can move away from the first transport section. The gripping force provided by the friction between the second gripper and the transport groove clamps the workpiece to be processed, reducing the number of power components in the second clamping section, thereby reducing the production cost of the deburring device. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the structure of the first clamping mechanism in the embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the structure of the second clamping mechanism in the embodiment of this application.

[0034] Figure 4 This is a schematic diagram showing the connection between the second transport unit and the second clamping mechanism in an embodiment of this application.

[0035] In the diagram: 1. First transport section; 11. First conveyor belt; 12. Second conveyor belt; 2. Second transport section; 21. Transport platform; 211. Transport trough; 3. First clamping section; 31. First clamping plate; 32. Second clamping plate; 33. Trigger rod; 331. First locking rod; 332. Second locking rod; 333. Abutment rod; 334. Trigger switch; 335. Return spring; 336. Limit sleeve; 337. Fixed seat; 338. Rotation clearance; 34. Clamping spring; 4. Second clamping section; 41. First gripper; 42. Second gripper; 5. First brush; 6. Second brush; 7. Release mechanism; 71. Adapter shaft; 72. Rotary motor; 73. First gripper; 74. Second gripper; 8. Third transport section. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a double-sided deburring device. (Refer to...) Figure 1 A double-sided deburring device includes a first transport section 1, a second transport section 2, a first clamping section 3, a second clamping section 4, a first brush 5, and a second brush 6.

[0038] The first transport section 1 and the second transport section 2 are arranged opposite to each other. The first clamping section 3 is fixedly connected to the first transport section 1, and the second clamping section 4 is fixedly connected to the second clamping section 4. The first clamping section 3 is used to clamp the workpiece to be processed at one end of the first transport section 1 directly opposite the second clamping section 4. The second clamping section 4 is used to clamp the workpiece to be processed at one end of the second transport section 2 directly opposite the first clamping section 3. The first brushes 5 are arranged at intervals at one end of the first transport section 1 directly opposite the second transport section 2 and can abut against the end of the workpiece to be processed away from the first transport section 1. The second brushes 6 are arranged at intervals at one end of the second transport section 2 directly opposite the first transport section 1 and can abut against the end of the workpiece to be processed away from the second transport section 2.

[0039] When removing burrs from the surface of a workpiece, one end of the workpiece first abuts against the first transport section 1 and is clamped onto the first transport section 1 by the first clamping part 3. Then, the first brush 5 removes the burrs from the side of the workpiece facing away from the first transport section 1. Next, the end of the workpiece with the burrs removed abuts against the second transport section 2, and the workpiece is clamped by the second clamping part 4, so that the end of the workpiece facing the first transport section 1 abuts against the second brush 6. The second brush 6 removes the burrs from the second side of the workpiece, thereby achieving the removal of burrs on both sides of the workpiece. This eliminates the need to flip the workpiece, reducing the impact of the workpiece length on the deburring device and thus expanding the application range of the deburring device.

[0040] Reference Figure 1 and Figure 2 The first transport unit 1 includes a first transport belt 11 and a second transport belt 12. A first clamping part 3 is fixedly connected to one end of the second transport belt 12 near the first transport belt 11. The first clamping part 3 is equipped with a trigger switch 334, which can control the movement of the second transport belt 12. When the workpiece to be processed is not clamped by the first clamping part 3, the second transport belt 12 stops moving. When the trigger switch 334 senses that the workpiece to be processed is clamped by the first clamping part 3, the second transport belt 12 begins to transport the workpiece to be processed.

[0041] The first transport section 1 is divided into a first transport belt 11 and a second transport belt 12. The first transport belt 11 transports the parts processed by the CNC machine tool to the deburring device. Then, the first clamping part 3 on the second transport belt 12 clamps the parts to be processed and removes the burrs on the parts to be processed by the first brush 5. After that, the second transport belt 12 transports the parts to be processed with one end processed to the second transport section 2.

[0042] Reference Figure 1 and Figure 2The first clamping part 3 includes a first clamping plate 31, a second clamping plate 32, a trigger rod 33, and a clamping spring 34. The first clamping plate 31 and the second clamping plate 32 are fixedly connected to both ends of the trigger rod 33 and are both located on the side of the trigger rod 33 closest to the first conveyor belt 11. Friction material, preferably rubber, is distributed on the opposite sides of the first clamping plate 31 and the second clamping plate 32. The clamping spring 34 is fixedly connected to both ends of the first clamping plate 31 and the second clamping plate 32.

[0043] The first clamping part 3 senses the position of the workpiece to be processed through the trigger rod 33. When the workpiece to be processed abuts against the trigger rod 33 and causes the trigger rod 33 to bend, the first clamping plate 31 and the second clamping plate 32 will accelerate to rotate under the action of the clamping spring 34, thereby clamping the workpiece to be processed by the first clamping plate 31 and the second clamping plate 32, thus realizing the clamping of the workpiece to be processed.

[0044] Reference Figure 1 and Figure 2 The trigger lever 33 includes a first latching lever 331, a second latching lever 332, and a trigger switch 334. The first latching lever 331 is hinged to the second latching lever 332 at one end facing it. An abutment lever 333 facing the first conveyor belt 11 is fixedly connected at the hinge point of the first latching lever 331 and the second latching lever 332. The trigger switch 334 is located at the end of the abutment lever 333 facing the first conveyor belt 11. A fixing seat 337 is hinged to the side of the first latching lever 331 and the second latching lever 332 away from the first conveyor belt 11. The fixing seat 337 is fixedly connected to the second conveyor belt 12. A rotation gap 338 is left between the fixing seat 337 and the abutment lever 333. The first locking rod 331 has a first groove on the side away from the clamping spring 34, and the second locking rod 332 has a second groove on the side away from the clamping spring 34. The first groove and the second groove are arranged opposite to each other and are connected to each other. The bottom of the second groove away from the first groove is connected to one end of the reset spring 335, and the bottom of the first groove is opposite to the second groove and connected to the other end of the reset spring 335.

[0045] By creating a first groove and a second groove on the side of the first locking rod 331 and the second locking rod 332 away from the clamping spring 34, and then placing the return spring 335 between the first groove and the second groove, the return spring 335 is limited by the first groove and the second groove, and the return spring 335 is provided with a space for extension and retraction. When the workpiece is transported to the second conveyor belt 12, the workpiece abuts against the abutment rod 333, causing the hinge of the first locking rod 331 and the second locking rod 332 to move away from the first conveyor belt 11, thereby causing the first locking rod 331 and the second locking rod 332 to rotate towards the workpiece, thus clamping the workpiece on the second conveyor belt 12, facilitating the removal of burrs on the side of the workpiece away from the second conveyor belt 12. At the same time, the second conveyor belt 12 is controlled to move towards the second transport section 2 by triggering the switch 334.

[0046] Reference Figure 1 and Figure 2 A release mechanism 7 is provided at one end of the second conveyor belt 12 away from the first clamping part 3. The release mechanism 7 includes a transfer shaft 71, which is coaxially connected to a rotating motor 72. The two sides of the transfer shaft 71 are rotatably connected to the frame fixed on both sides of the second conveyor belt 12. A first gripping rod 73 and a second gripping rod 74 are connected to the side of the transfer shaft 71 closest to the first conveyor belt 11. The lengths of the first gripping rod 73 and the second gripping rod 74 are both longer than the distance between the transfer shaft 71 and the trigger rod 33. The distance between the first gripping rod 73 and the second gripping rod 74 is greater than the distance between the fixed seats 337.

[0047] After the burrs on the upper surface of the workpiece are removed by the first clamping part 3 on the second conveyor belt 12, the workpiece and the first clamping part 3 are transported to the release mechanism 7. The rotating motor 72 drives the adapter shaft 71 to rotate, so that the first gripping rod 73 and the second gripping rod 74 abut against the first locking rod 331 and the second locking rod 332 at both ends of the fixed seat 337. The adapter shaft 71 continues to rotate, thereby driving the first locking rod 331 and the second locking rod 332 to rotate around the fixed seat 337, so that the first clamping part 3 returns to its original position and the first clamping part 3 releases the workpiece.

[0048] Reference Figure 1 and Figure 2 A lifting platform (not shown in the attached diagram) is arranged between the first locking rod 331 and the second locking rod 332. A lifting box is arranged on the side of the lifting platform near the second transport section 2. The lifting box is fixedly connected to the second transport belt 12, and a hydraulic rod is installed inside the lifting box. The telescopic end of the hydraulic rod is fixedly connected to the lifting plate, and the fixed end of the hydraulic rod is fixedly connected to the lifting box.

[0049] When the release mechanism 7 causes the first clamping part 3 to release the workpiece to be processed, the hydraulic rod below the lifting platform drives the lifting platform to move towards the second transport part 2, so that the workpiece to be processed can be clamped on the second transport part 2 by the second clamping part 4.

[0050] Reference Figure 3 and Figure 4 The second transport section 2 includes a transport platform 21, which is arranged parallel to the second transport belt 12. A transport groove 211 is formed on the side of the transport platform 21 facing the first transport section 1, along the transport direction of the second transport belt 12. The second clamping section 4 is slidably connected within the transport groove 211. The second clamping section 4 includes a first clamp 41 and a second clamp 42, which are spaced apart. A friction material, preferably rubber, is provided on the opposite side of the first clamp 41 and the second clamp 42. A first sliding block (not shown in the figures) is connected to the end of the first clamp 41 facing away from the first transport section 1. The first sliding block is slidably connected to the side of the transport platform 21 facing away from the first clamp 41. A powered transport belt (not shown in the figures) that transports along the direction of the transport groove 211 is fixedly connected to one side of the first sliding block. The second gripper 42 and the wall of the transport trough 211 are evenly provided with friction protrusions. The second gripper 42 is fixedly connected to a second sliding block (not shown in the figure) on the side away from the first transport belt 11. The second sliding block is slidably connected to the side of the transport platform 21 away from the first transport belt 11. The first slider is fixedly connected to an L-shaped plate (not shown in the figure). The L-shaped plate can abut against the side of the second slider away from the first slider.

[0051] When the part to be processed is transported from the lifting platform to the second transport section 2, the deburred end of the part abuts against the end of the transport platform 21 facing the second transport belt 12. At this time, the first gripper 41 is driven by the power transport belt, causing the first gripper 41 to move along the transport groove 211 away from the first transport section 1, so that the part to be processed moves to abut against the second gripper 42, thereby clamping the part to be processed by the first gripper 41 and the second gripper 42. After clamping the part to be processed, the first gripper 41 and the second gripper 42 move away from the first transport section 1, so that the side of the part to be processed away from the first transport platform 21 is suspended and comes into contact with the second brush 6, thereby removing the burrs on the side of the part to be processed away from the transport platform 21, realizing the removal of burrs on both sides of the part to be processed.

[0052] Reference Figure 1 and Figure 4A third transport section 8 is provided on the side of the second transport section 2 opposite to the first transport section 1, and the third transport section 8 is located at the end of the second transport section 2 directly opposite the first transport section 1. After the burrs on both sides of the workpiece are removed, the power conveyor belt reverses, causing the first gripper 41 to move away from the second gripper 42, so that the finished workpiece falls into the third transport section 8. Then, the first gripper 41 drives the second gripper 42 through the L-shaped plate and transports it in the direction of the first transport section 1 until it returns to its original position.

[0053] The implementation principle of the double-sided deburring device in this application embodiment is as follows: When removing burrs from a part after machining in a CNC machine tool, the part is transported to the second conveyor belt 12 via the first conveyor belt 11, so that the first clamping part 3 clamps the part to be processed on the first conveyor belt 12, thereby removing the burrs at one end of the part by the first brush 5. After removing the burrs at one end of the part, the first clamping part 3 is released from the part by the loosening mechanism 7, and the part is transported to the second conveyor belt 2 via the lifting platform. The part is clamped by the second clamping part 4, so that the end of the part without burrs is suspended in the air, and the burrs on the other end of the part are removed by the second brush 6, thus achieving the removal of burrs on both sides of the part. This makes the volume of the double-sided deburring device unaffected by the length of the part, thereby expanding the application range of the double-sided deburring device.

[0054] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-sided deburring device, characterized in that: It includes a first transport section (1), a second transport section (2), a first clamping section (3), a second clamping section (4), a first brush (5), and a second brush (6). The first transport section (1) and the second transport section (2) are arranged opposite to each other. The first clamping section (3) is fixedly connected to the first transport section (1), and the second clamping section (4) is fixedly connected to the second transport section (2). Both the first clamping section (3) and the second clamping section (4) are used to clamp the parts to be processed. The first brush (5) is positioned facing the first transport section (1), and the second brush (6) is positioned facing the second transport section (2). The holding part (3) includes a first clamping plate (31), a second clamping plate (32), a trigger rod (33), and a clamping spring (34). The first clamping plate (31) and the second clamping plate (32) are fixedly connected to the two ends of the trigger rod (33). The two ends of the clamping spring (34) are fixedly connected to the first clamping plate (31) and the second clamping plate (32). The clamping spring (34) can shorten the distance between the first clamping plate (31) and the second clamping plate (32). The trigger rod (33) includes a first locking rod (331), a second locking rod (332), and an abutment rod (333). The first locking rod (331) is hinged to the second locking rod (332) at one end facing the second locking rod (332). An abutment rod (333) is connected to the hinge of the first locking rod (331) and the second locking rod (332). A trigger switch (334) is connected to the abutment rod (333). The trigger switch (334) is used to control the movement of the second conveyor belt (12). A limit sleeve (336) is slidably connected to the side of the first locking rod (331) and the second locking rod (332) away from the first conveyor belt (11). A fixing seat (337) is hinged to the limit sleeve (336). The fixing seat (337) is fixed. The second conveyor belt (12) is connected, and a rotation gap (338) is left between the fixed seat (337) and the first clamping rod (331); a release mechanism (7) is provided at one end of the second conveyor belt (12) away from the first clamping part (3). The release mechanism (7) includes a transfer shaft (71), and a rotating motor (72) is coaxially connected to the transfer shaft (71). A first gripping rod (73) and a second gripping rod (74) are connected to the side of the transfer shaft (71) facing the first conveyor belt (11). The distance between the first gripping rod (73) and the second gripping rod (74) is greater than the width of the fixed seat (337).

2. The double-sided deburring device according to claim 1, characterized in that: The first transport unit (1) includes a first transport belt (11) and a second transport belt (12), and the first clamping part (3) is fixedly connected to the second transport belt (12). The first clamping part (3) can control the start and stop of the second transport belt (12).

3. The double-sided deburring device according to claim 1, characterized in that: The first locking rod (331) has a first groove on the side away from the clamping spring (34), and the second locking rod (332) has a second groove on the side away from the clamping spring (34). The second groove is positioned opposite to and connected to the first groove. The second groove is connected to a reset spring (335). The two ends of the reset spring (335) are connected to the bottom of the first groove and the second groove.

4. The double-sided deburring device according to claim 2, characterized in that: The second transport section (2) includes a transport platform (21), and the transport platform (21) has a transport groove (211) on one side facing the first transport section (1) along the transport direction of the second transport belt (12), and the second clamping part (4) is slidably connected in the transport groove (211).

5. The double-sided deburring device according to claim 4, characterized in that: The second clamping part (4) includes a first clamping claw (41) and a second clamping claw (42). The first clamping claw (41) and the second clamping claw (42) are spaced apart. The first clamping claw (41) is connected to a drive mechanism on the side away from the first transport part (1). The second clamping claw (42) is rubbed against the wall of the transport groove (211).

6. The double-sided deburring device according to claim 1, characterized in that: The second transport section (2) has a third transport section (8) on the side opposite to the first transport section (1), and the third transport section (8) is positioned opposite the second transport section (2).

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