Automatic wood box nailing device

Abstract

This utility model discloses an automatic wooden crate nailing device, relating to the field of wood or similar material processing technology. The automatic wooden crate nailing device includes a crate binding frame, with two support frames fixedly connected to the top of the binding frame. A nailing adjustment structure and a crate adjustment structure are installed on the support frames and located on the binding frame. The device uses an electric telescopic rod to push a moving clamping plate to cooperate with a rotating clamping plate, achieving clamping and positioning of the wooden crate. Simultaneously, in conjunction with the clamping frames, it ensures that the top and sides of the wooden crate are firmly clamped, improving the adaptability and stability of the clamping. A stepper motor precisely controls the rotation of the rotating clamping plate, allowing the wooden crate to rotate around its axis and precisely adjust the nailing angle. When nailing the side of the wooden crate, the rotating clamping plate can rotate 90°, so that the side of the wooden crate faces the nailing machine body, ensuring the accuracy of the nailing position and further improving the convenience of wooden crate nailing.

Description

Technical Field

[0001] This utility model relates to the field of wood or similar material processing technology, and in particular to an automatic wooden box nailing device. Background Technology

[0002] Existing wooden crate nailing machines often lack mechanical fixing and rely on manual operation, leading to deviations in nail placement and reduced product quality. Chinese Utility Model Patent, authorized publication number "CN222590141U," discloses a wooden crate nailing machine. This utility model's machine, when performing multi-point nailing on wood, moves a horizontal rail and a moving platform, causing the nailing machine body to move horizontally until the output end of the nailing machine body aligns with the target position. Then, the fixing component is activated to secure the horizontal rail, preventing the nailing machine body from moving forward or backward. Finally, two... The clamping device moves the moving platform upwards, pressing it firmly against the horizontal rail, preventing it from moving left or right. Once positioning is complete, the telescopic cylinder and the nailing machine body are activated to nail the wooden box. When nailing the next point, the fixing device and the two clamping devices are disengaged. Repeating this operation allows for position adjustment. This avoids the problems of existing technologies that cannot adjust the position of the nailing machine, requiring multiple installations and positioning steps for multi-point nailing, leading to excessive processing time and low production efficiency. This method provides a convenient and quick way to nail wood at multiple points, improving production efficiency.

[0003] When using the above-mentioned technical solutions, it is not convenient to adjust the wooden boxes to the required position when facing wooden boxes that need to be nailed from multiple angles. This makes it difficult for the nail gun to be aligned with the ideal nailing point, and the position of the wooden box often needs to be adjusted manually. This not only consumes a lot of manpower and time, but also easily leads to inaccurate positioning, which seriously reduces production efficiency. Therefore, we propose an automatic wooden box nailing device. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the technical problems existing in the prior art, and to provide an automatic wooden box nailing device that can solve the problem that when faced with wooden boxes that need to be nailed from multiple directions, it is not easy to adjust the wooden box to the required position, making it difficult for the nail gun to be aligned with the ideal nailing point. Often, the position of the wooden box needs to be manually adjusted, which not only consumes a lot of manpower and time, but also easily leads to inaccurate positioning, seriously reducing production efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic wooden box nailing device, comprising:

[0006] The wooden crate binding rack has two support frames fixedly connected to its top, and the support frames are equipped with a nailing adjustment mechanism.

[0007] The wooden crate adjustment mechanism is located on the wooden crate binding frame;

[0008] The wooden crate adjustment structure includes an electric telescopic rod, a movable clamping plate, a stepper motor, and a rotating clamping plate. The electric telescopic rod is fixedly installed on one side of the wooden crate binding frame. The telescopic end of the electric telescopic rod slides into the interior of the wooden crate binding frame and is fixedly connected to the movable clamping plate. Two slots are provided on the movable clamping plate. The stepper motor is fixedly installed on the side of the wooden crate binding frame away from the movable clamping plate. The output end of the stepper motor extends rotatably into the interior of the wooden crate binding frame and is fixedly connected to the rotating clamping plate. A threaded rod is rotatably connected inside the rotating clamping plate. A stepper motor is fixedly installed on the top of the rotating clamping plate. The output end of the stepper motor extends rotatably into the interior of the rotating clamping plate and is fixedly connected to the threaded rod.

[0009] Preferably, the wooden box adjustment structure further includes a clamping frame, a placement frame, a battery, and a mounting plate. The placement frame is fixedly connected to the bottom of the rotating clamping plate. A protrusion on the clamping frame is threaded onto the outer surface of the threaded rod. The protrusion on the clamping frame is slidably connected to the inside of the rotating clamping plate. The clamping frame is adapted to the inside of the two slots. A mounting groove is provided on one side of the rotating clamping plate. The battery is installed inside the mounting groove. The mounting plate bolt is installed on the side of the rotating clamping plate near the mounting groove.

[0010] Preferably, the nail-driving adjustment structure includes a second stepper motor, a first threaded rod, two first limit rods, a moving platform, two electric push rods, and a lifting frame. The first threaded rod and the two first limit rods are rotatably connected to the opposite surfaces of the two support frames. The second stepper motor is fixedly installed on the corresponding support frame. The output end of the second stepper motor rotatably passes through the corresponding support frame and is fixedly connected to the first threaded rod. The moving platform is threaded onto the outer surface of the first threaded rod and slidably fitted onto the outer surface of the two first limit rods. The two electric push rods are fixedly installed on the top of the moving platform. The telescopic ends of the two electric push rods slidably pass through the moving platform and are fixedly connected to the lifting frame.

[0011] Preferably, the nailing adjustment structure further includes a stepper motor four, a threaded rod three, a moving plate and a nailing machine body. The stepper motor four is fixedly installed on one side of the lifting frame. The output end of the stepper motor four extends rotatably into the interior of the lifting frame and is fixedly connected to the threaded rod three. The threaded rod three is rotatably connected to the interior of the lifting frame. The moving plate is threadedly sleeved on the outer surface of the threaded rod three. The moving plate is slidably connected to the inner top wall of the lifting frame. The nailing machine body is installed at the bottom of the moving plate.

[0012] Preferably, the lifting frame has two limiting rods fixedly connected inside, and the moving plate is slidably sleeved on the outer surface of the two limiting rods.

[0013] Preferably, both the placement rack and the clamping rack are U-shaped structures.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This automatic wooden crate nailing device uses an electric telescopic rod to push a moving clamping plate to cooperate with a rotating clamping plate, achieving clamping and positioning of the wooden crate. Simultaneously, the clamping frame ensures that the top and sides of the crate are securely clamped, improving the adaptability and stability of the clamping. A stepper motor precisely controls the rotation of the rotating clamping plate, allowing the crate to rotate around its axis and accurately adjust the nailing angle. When nailing the side of the crate, the rotating clamping plate can rotate 90°, aligning the side of the crate with the nailing machine body, ensuring the accuracy of the nailing position and further improving the convenience of crate nailing. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the mobile platform structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the movable clamping plate structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the lifting frame structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the clamping frame structure of this utility model.

[0022] Reference numerals in the attached drawings: 1. Wooden crate binding rack; 2. Electric telescopic rod; 3. Moving clamping plate; 4. Rotating clamping plate; 5. Stepper motor one; 6. Support frame; 7. Stepper motor two; 8. Threaded rod one; 9. Limiting rod one; 10. Moving platform; 11. Electric push rod; 12. Stepper motor four; 13. Stepper motor three; 14. Placement rack; 15. Clamping frame; 16. Slot; 17. Threaded rod two; 18. Mounting plate; 19. Battery; 20. Mounting slot; 21. Lifting frame; 22. Threaded rod three; 23. Moving plate; 24. Limiting rod two; 25. Nailer body. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0026] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Please see Figure 1-5 This utility model provides a technical solution: an automatic wooden box nailing device, comprising:

[0028] Wooden crate binding frame 1, the top of the wooden crate binding frame 1 is fixedly connected to two support frames 6, and the support frames 6 are provided with a nailing adjustment structure;

[0029] Wooden crate adjustment structure, the wooden crate adjustment structure is located on the wooden crate binding frame 1;

[0030] The wooden crate adjustment structure includes an electric telescopic rod 2, a movable clamping plate 3, a stepper motor 5, and a rotating clamping plate 4. The electric telescopic rod 2 is fixedly installed on one side of the wooden crate binding frame 1. The telescopic end of the electric telescopic rod 2 slides into the interior of the wooden crate binding frame 1 and is fixedly connected to the movable clamping plate 3. The movable clamping plate 3 has two slots 16. The stepper motor 5 is fixedly installed on the side of the wooden crate binding frame 1 away from the movable clamping plate 3. The output end of the stepper motor 5 rotates into the interior of the wooden crate binding frame 1 and is fixedly connected to the rotating clamping plate 4. A threaded rod 17 is rotatably connected inside the rotating clamping plate 4. A stepper motor 13 is fixedly installed on the top of the rotating clamping plate 4. The output end of the stepper motor 13 rotates into the interior of the rotating clamping plate 4 and is fixedly connected to the threaded rod 17.

[0031] The wooden box adjustment structure also includes a clamping frame 15, a placement frame 14, a battery 19, and a mounting plate 18. The placement frame 14 is fixedly connected to the bottom of the rotating clamping plate 4. The protrusion on the clamping frame 15 is threaded onto the outer surface of the threaded rod 17. The protrusion on the clamping frame 15 is slidably connected to the inside of the rotating clamping plate 4. The clamping frame 15 is correspondingly adapted to the inside of the two slots 16. A mounting groove 20 is opened on one side of the rotating clamping plate 4. The battery 19 is installed inside the mounting groove 20. The mounting plate 18 is bolted to the side of the rotating clamping plate 4 near the mounting groove 20. Both the placement frame 14 and the clamping frame 15 are "U" shaped structures.

[0032] The nail-driving adjustment structure includes a second stepper motor 7, a threaded rod 8, two limit rods 9, a moving platform 10, two electric push rods 11, and a lifting frame 21. The threaded rod 8 and the two limit rods 9 are rotatably connected to the opposite surfaces of the two support frames 6. The second stepper motor 7 is fixedly installed on the corresponding support frame 6. The output end of the second stepper motor 7 rotatably passes through the corresponding support frame 6 and is fixedly connected to the threaded rod 8. The moving platform 10 is threadedly sleeved on the outer surface of the threaded rod 8. The moving platform 10 is slidably sleeved on the outer surface of the two limit rods 9. The two electric push rods 11 are fixedly installed on the top of the moving platform 10. The telescopic ends of the two electric push rods 11 slide through the moving platform 10 and are fixedly connected to the lifting frame 21.

[0033] The nailing adjustment structure also includes a stepper motor 12, a threaded rod 22, a moving plate 23, and a nailing machine body 25. The stepper motor 12 is fixedly installed on one side of the lifting frame 21. The output end of the stepper motor 12 extends into the interior of the lifting frame 21 and is fixedly connected to the threaded rod 22. The threaded rod 22 is rotatably connected to the interior of the lifting frame 21. The moving plate 23 is threadedly sleeved on the outer surface of the threaded rod 22. The moving plate 23 is slidably connected to the inner top wall of the lifting frame 21. The nailing machine body 25 is installed at the bottom of the moving plate 23. Two limiting rods 24 are fixedly connected inside the lifting frame 21. The moving plate 23 is slidably sleeved on the outer surface of the two limiting rods 24.

[0034] Furthermore, when using the device, the wooden box to be nailed is placed on the placement frame 14 of the rotating clamping plate 4. The electric telescopic rod 2 is activated, and its telescopic end pushes the movable clamping plate 3 to move towards the rotating clamping plate 4. The slot 16 of the movable clamping plate 3 is inserted into the clamping rod of the clamping frame 15 to form a clamping of the wooden box. At this time, the stepper motor 3 13 is activated, and the stepper motor 3 13 drives the threaded rod 2 17 to rotate. The rotation of the threaded rod 2 17 will drive the clamping frame 15 to move under the guidance inside the rotating clamping plate 4, thereby adjusting the position of the clamping frame 15, which facilitates the clamping of the top of the wooden box and ensures stable clamping.

[0035] When the nailing angle of the wooden crate needs to be adjusted, stepper motor 5 starts, driving the rotating clamping plate 4 to rotate, thereby causing the clamped wooden crate to rotate around the axis. Thus, when nailing the side of the wooden crate, the rotating clamping plate 4 can rotate 90°, so that the side of the wooden crate faces the nailing machine body 25. This rotation is precisely controlled by stepper motor 5 to ensure accurate nailing position.

[0036] Stepper motor 27 starts, driving threaded rod 18 to rotate. Threaded rod 18 drives the moving platform 10 to move under the guidance of two limit rods 19, adjusting the nailer's horizontal position to cover the width of the wooden box. Two electric push rods 11 are started, driving the lifting frame 21 to move up and down, adjusting the nailer's height to meet the nailing requirements of the wooden box's height. Stepper motor 412 starts, driving threaded rod 322 to rotate. The moving plate 23 slides under the limit of two limit rods 24, allowing the nailer body 25 to accurately align with the nailing point of the wooden box.

[0037] After the wooden box is clamped and adjusted to the target angle, the nailing adjustment structure positions the nailing machine body 25 to the nailing position through the above three-dimensional movement. The nailing machine is started, and the nails are shot out from the nailing machine body 25, penetrating the wooden box panels to complete the nailing. Throughout the process, the storage battery 19 provides power to the rotating stepper motor 3 13.

[0038] The equipment uses an electric telescopic rod 2 to push the moving clamping plate 3 to cooperate with the rotating clamping plate 4, thereby achieving the clamping and positioning of the wooden box. At the same time, in conjunction with the clamping frame 15, it ensures that the top and sides of the wooden box can be firmly clamped, improving the adaptability and stability of the clamping. The stepper motor 5 precisely controls the rotation of the rotating clamping plate 4, allowing the wooden box to rotate around the axis and accurately adjust the nailing angle. When nailing the side of the wooden box, the rotating clamping plate 4 can rotate 90° so that the side of the wooden box faces the nailing machine body 25, ensuring the accuracy of the nailing position and further improving the convenience of nailing the wooden box.

[0039] Structural Description: Wooden Crate Binding Frame 1: Provides fixed support for the entire equipment, and connects to the support frame 6 at the top, providing an installation base for the wooden crate adjustment structure and nailing adjustment structure;

[0040] Support frame 6: There are two in total. They are fixed on the top of the wooden box binding frame 1 and are used to install the threaded rod 8, limit rod 9 and other components of the nailing adjustment structure to support the nailing adjustment structure.

[0041] Electric telescopic rod 2: It is fixedly installed on one side of the wooden box binding rack 1, and the telescopic end is connected to the movable clamping plate 3. Pushing the movable clamping plate 3 to move it can clamp the wooden box.

[0042] The movable clamping plate 3 is fixedly connected to the telescopic end of the electric telescopic rod 2, and has two slots 16 on the top for insertion and engagement with the clamping frame 15 to clamp the wooden box.

[0043] Stepper motor 5: It is fixedly installed on the side of the wooden box binding frame 1 away from the movable clamping plate 3. Its output end is connected to the rotating clamping plate 4, which drives the rotating clamping plate 4 to rotate so as to adjust the angle of the wooden box.

[0044] Rotating clamping plate 4: It is fixedly connected to the output end of stepper motor 5, internally rotates and connects to threaded rod 17, and connects to the bottom of the placement rack 14 for clamping and rotating the wooden box.

[0045] Threaded rod 17: Rotatably connected inside the rotating clamping plate 4, and fixedly connected to the output end of stepper motor 13. When rotating, it drives the clamping frame 15 to move and adjust the clamping position.

[0046] Stepper motor 313: It is fixedly installed on the top of the rotating clamping plate 4, and its output end is connected to threaded rod 217 to drive threaded rod 217 to rotate;

[0047] Clamping frame 15: The upper protrusion is threadedly sleeved on the outer surface of the threaded rod 17, and is slidably connected to the inside of the rotating clamping plate 4, and is adapted to the slot 16 of the movable clamping plate 3 for clamping the top of the wooden box.

[0048] Placement rack 14: Fixedly connected to the bottom of the rotating clamping plate 4, in the form of a "U" shape, used to place the wooden box to be nailed together;

[0049] Battery 19: Installed in the mounting slot 20 of the rotating clamping plate 4, providing separate power to the stepper motor 13;

[0050] Mounting plate 18: Bolts are installed on the side of the rotating clamping plate 4 near the mounting groove 20 to fix the storage battery 19;

[0051] Mounting slot 20: Located on one side of the rotating clamping plate 4, for mounting the storage battery 19;

[0052] Stepper motor 2 7: Fixedly mounted on support frame 6, with output end connected to threaded rod 1 8, driving threaded rod 1 8 to rotate, thereby adjusting the horizontal position of the nailing machine;

[0053] Threaded rod 8: Rotatably connected to the opposite surfaces of the two support frames 6, and fixedly connected to the output end of stepper motor 7. When rotated, it drives the moving table 10 to move horizontally.

[0054] Limiting rod 19: There are two in total, which are rotatably connected to the opposite surfaces of the two support frames 6 to limit the movement direction of the moving platform 10 and ensure its horizontal movement;

[0055] The movable stage 10 is threaded onto the outer surface of the threaded rod 8 and slidably fitted onto the outer surface of the two limit rods 9. It is used to install the electric push rod 11 and drive the nailing machine to move horizontally.

[0056] Electric push rods 11: There are two in total, which are fixedly installed on the top of the moving platform 10. The telescopic end is connected to the lifting frame 21 and is used to adjust the height of the nailing machine.

[0057] Lifting frame 21: It is fixedly connected to the telescopic end of the electric push rod 11 and is used to install components such as stepper motor 12 and threaded rod 22 to drive the nailing machine to move up and down;

[0058] Stepper motor 412: It is fixedly installed on one side of the lifting frame 21, and its output end is connected to threaded rod 322 to drive the threaded rod 322 to rotate in order to adjust the front and rear position of the nailing machine;

[0059] Threaded rod 22: Rotatably connected inside the lifting frame 21, and fixedly connected to the output end of stepper motor 12. When rotating, it drives the moving plate 23 to move back and forth.

[0060] The movable plate 23 is threaded onto the outer surface of the threaded rod 22 and slidably connected to the inner top wall of the lifting frame 21. The bottom is equipped with the nailing machine body 25, which is used to drive the nailing machine body 25 to move and align it with the nailing point.

[0061] Nailer body 25: Installed at the bottom of the movable plate 23, used to shoot nails to complete the nailing of the wooden box. It is an existing device. For details, please refer to the patent: CN222590141U.

[0062] Limiting rod 24: There are two in total, which are fixedly connected inside the lifting frame 21 to limit the movement direction of the moving plate 23 and ensure its forward and backward movement;

[0063] Slot 16: Two slots are provided on the movable clamping plate 3 for connecting with the clamping rod of the clamping frame 15 to clamp the wooden box.

[0064] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An apparatus for automatically nailing a wooden box, characterized by comprising: include: Wooden box binding frame (1), the top of the wooden box binding frame (1) is fixedly connected to two support frames (6), and the support frames (6) are provided with a nailing adjustment structure; The wooden box adjustment structure is located on the wooden box binding frame (1); The wooden box adjustment structure includes an electric telescopic rod (2), a movable clamping plate (3), a stepper motor (5), and a rotating clamping plate (4). The electric telescopic rod (2) is fixedly installed on one side of the wooden box binding frame (1). The telescopic end of the electric telescopic rod (2) slides into the interior of the wooden box binding frame (1) and is fixedly connected to the movable clamping plate (3). Two slots (16) are provided on the movable clamping plate (3). Among them, stepper motor 1 (5) is fixedly installed on the side of the wooden box binding frame (1) away from the movable clamping plate (3). The output end of stepper motor 1 (5) extends into the interior of the wooden box binding frame (1) and is fixedly connected to the rotating clamping plate (4). The interior of the rotating clamping plate (4) is rotatably connected to threaded rod 2 (17). The top of the rotating clamping plate (4) is fixedly installed with stepper motor 3 (13). The output end of stepper motor 3 (13) extends into the interior of the rotating clamping plate (4) and is fixedly connected to threaded rod 2 (17).

2. An apparatus for automatically nailing wooden boxes according to claim 1, characterized in that: The wooden box adjustment structure also includes a clamping frame (15), a placement frame (14), a battery (19), and a mounting plate (18). The placement frame (14) is fixedly connected to the bottom of the rotating clamping plate (4). The protrusion on the clamping frame (15) is threaded onto the outer surface of the threaded rod (17). The protrusion on the clamping frame (15) is slidably connected to the inside of the rotating clamping plate (4). The clamping frame (15) is correspondingly adapted to the inside of the two slots (16). The rotating clamping plate (4) has an installation groove (20) on one side, the battery (19) is installed inside the installation groove (20), and the mounting plate (18) is bolted to the side of the rotating clamping plate (4) near the installation groove (20).

3. An apparatus for automatically nailing wooden boxes according to claim 1, characterized in that: The nailing adjustment structure includes a stepper motor (7), a threaded rod (8), two limit rods (9), a moving platform (10), two electric push rods (11), and a lifting frame (21). The threaded rod (8) and the two limit rods (9) are rotatably connected to the opposite surfaces of the two support frames (6). Among them, stepper motor 2 (7) is fixedly installed on the corresponding support frame (6). The output end of stepper motor 2 (7) rotates through the corresponding support frame (6) and is fixedly connected to threaded rod 1 (8). The moving platform (10) is threadedly sleeved on the outer surface of threaded rod 1 (8). The moving platform (10) is slidably sleeved on the outer surface of two limit rods 1 (9). Two electric push rods (11) are fixedly installed on the top of the moving platform (10). The telescopic ends of the two electric push rods (11) slide through the moving platform (10) and are fixedly connected to the lifting frame (21).

4. An apparatus for automatically nailing wooden cases according to claim 1, characterized in that: The nailing adjustment structure also includes a stepper motor four (12), a threaded rod three (22), a moving plate (23) and a nailing machine body (25). The stepper motor four (12) is fixedly installed on one side of the lifting frame (21). The output end of the stepper motor four (12) rotates and extends into the interior of the lifting frame (21) and is fixedly connected to the threaded rod three (22). Among them, the threaded rod three (22) is rotatably connected inside the lifting frame (21), the moving plate (23) is threadedly sleeved on the outer surface of the threaded rod three (22), the moving plate (23) is slidably connected to the inner top wall of the lifting frame (21), and the nailing machine body (25) is installed at the bottom of the moving plate (23).

5. An apparatus for automatically nailing a wooden case according to claim 4, wherein: The lifting frame (21) has two fixedly connected limit rods (24) inside, and the moving plate (23) is slidably sleeved on the outer surface of the two limit rods (24).

6. An apparatus for automatically nailing wooden cases according to claim 2, characterized in that: Both the placement rack (14) and the clamping rack (15) are U-shaped structures.

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