A zigzag-shaped dragon bone bending tool and its usage method

Abstract

The present invention discloses a U-shaped keel bending tool and its usage method, which relates to the technical field of prefabricated decoration. This application bends the assembly part of the U-shaped keel, specifically including a stretching device for bending the assembly part of the U-shaped keel when stretching it outwards, a limiting device placed above the stretching device for limiting the U-shaped keel, and a cutting device for cutting the U-shaped keel. The present invention fixes the upper part of the U-shaped keel that does not need to be bent through the limiting device placed above the stretching device, then separates the assembly part from the U-shaped keel main body through the cutting device, only keeping the upper end where the assembly part contacts the limiting device and continuing to be connected to the main body of the U-shaped keel. After cutting, horizontally move the stretching device outwards, thereby driving the assembly part of the U-shaped keel to fold along the upper end in contact with the limiting device.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated decoration, and particularly to a U-shaped keel bending tool and its usage method. Background Art

[0002] The function of the ceiling has evolved from simply covering up defects at the beginning to now requiring aesthetics, sound insulation, and many other functions. In the field of prefabricated ceiling decoration, the quality of ceiling installation directly affects the quality of the interior decoration effect, and further affects the style effect of the interior decoration. Currently, the most commonly used ceiling is the integrated ceiling. In order to make it match keels of different heights during installation and facilitate assembly and maintenance, an installation adjustment plate needs to be provided. The existing installation forms of the current prefabricated ceiling adjustment plate have the following problems: 1. The end of the U-shaped keel is a cavity, and small wooden blocks need to be inserted to fix it to other structures (40 aluminum edge trim); 2. When installing multiple components, the steps are cumbersome and the operation is difficult.

[0003] Chinese Patent CN205134862U, with a publication date of April 6, 2016, provides a clamping plate type aluminum strip board installation structure, including a decorative panel, a keel, a lower clamping part, and an upper clamping part. The upper clamping part and the lower clamping part are clamped and fixed to each other. The upper and lower sides of the two sides of the upper clamping part and the lower clamping part clamp the upper side of the decorative panel. A connecting part is fixed on the upper clamping part, and the keel is sleeved in the connecting part and located above the upper clamping part. This utility model adopts the clamping structure of the lower clamping part and the upper clamping part on the decorative panel to achieve the rotatable and position-adjustable splicing installation of the device board or strip, with the characteristics of high strength, firm installation, convenient disassembly and assembly, and easy operation. However, in this application, the assembly of the keel and the decorative panel cannot be directly carried out. It is necessary to clamp the upper side of the decorative panel through the two sides of the clamping part and the lower clamping part, and the keel is sleeved in the connecting part fixed on the upper clamping part to achieve the assembly of the keel and the decorative panel. The steps are cumbersome and the operation is difficult. Summary of the Invention

[0004] The purpose of the present invention is to provide a U-shaped keel bending tool and its usage method for the deficiencies of the above-mentioned existing technologies, which can quickly bend the U-shaped keel to facilitate its fixation with other structures during assembly.

[0005] The present invention provides a U-shaped keel bending tool for bending the assembly part of the U-shaped keel, including a stretching device for bending the assembly part of the U-shaped keel when it is stretched outwards, a limiting device placed above the stretching device for limiting the U-shaped keel, and a cutting device for cutting the U-shaped keel.

[0006] Further, the stretching device includes a bending part and a first handle provided at one end of the bending part for stretching outwards.

[0007] Further, the bent portion includes a first connecting plate erected vertically, and a second connecting plate connected to one end of the first connecting plate and erected horizontally. The handle is provided at one end of the second connecting plate away from the first connecting plate. One side surface of the first connecting plate close to the second connecting plate abuts against one inner side surface of the U-shaped keel, and the upper end surface of the second connecting plate abuts against the bottom of the U-shaped keel.

[0008] Further, the limiting device is provided with a clamping groove for clamping one side of the U-shaped keel.

[0009] Further, the clamping grooves are two clamping grooves respectively for clamping both sides of the U-shaped keel, and the stretching devices are two stretching devices arranged back to back.

[0010] Further, the two clamping grooves are evenly distributed on the limiting device, and the distances between the two clamping grooves and the edge of the limiting device are not less than the thickness of the clamping grooves.

[0011] Further, the cutting device includes a cutter head and a second handle connected to one end of the cutter head.

[0012] Further, the cutter head is a triangular cutter head. The second handle is connected to one side of the triangular cutter head. The other two sides of the triangular cutter head not connected to the second handle can be used for cutting the U-shaped keel, and the included angle between the other two sides of the triangular cutter head not connected to the second handle is between 0 and 90°.

[0013] Further, the distance between the upper end surface of the first connecting plate and the upper end surface of the second connecting plate is equal to the thickness of the 40 aluminum edge trim.

[0014] A method for using a U-shaped keel bending tool includes the following steps:

[0015] S1: Clamp the U-shaped keel in the clamping groove of the limiting device for limiting;

[0016] S2: Use the cutting device to cut both wings of the U-shaped keel;

[0017] S3: Translate the stretching devices on both sides outwards until the U-shaped keel is formed;

[0018] S4: Remove the bending tool.

[0019] A U-shaped keel bending tool and a method for using the same according to the present invention have the following beneficial effects:

[0020] (1) The bending tool fixes the upper part of the U-shaped keel that does not need to be bent through a limiting device placed above the stretching device, and then cuts and separates the assembly part from the U-shaped keel body through a cutting device, only keeping the upper end where the assembly part contacts the limiting device and continuing to be connected to the main body of the U-shaped keel. After cutting, the stretching device is horizontally moved outwards, thereby driving the assembly part of the U-shaped keel to fold along the upper end in contact with the limiting device. When the stretching device is removed from the U-shaped keel, the assembly part just folds 90° from the vertical state to the horizontal state. At this time, the accommodation cavity formed by the assembly part and the U-shaped main body can be used for assembling with other structures;

[0021] (2) The stretching device of the bending tool includes a bending part and a first handle provided at one end of the bending part for outward stretching. When the stretching device is in use, the bending part abuts against the inner side of the assembly part of the U-shaped keel, and the first handle is connected to the horizontally arranged end of the bending part. After the cutting device cuts and separates the assembly part from the U-shaped keel body, only the upper end of the assembly part is retained and connected to the U-shaped keel body. Since the limiting device fixes the U-shaped keel body at the upper end of the assembly part, when the first handle is horizontally moved outwards, it will drive the bending part to move horizontally, thereby driving the assembly part to fold along the upper end in contact with the limiting device;

[0022] (3) The bending part of the bending tool includes a vertically arranged first connecting plate and a horizontally arranged second connecting plate connected to one end of the first connecting plate. The first handle is provided at the end of the second connecting plate far from the first connecting plate. One side of the first connecting plate close to the second connecting plate abuts against one inner side of the keel, and the upper end surface of the second connecting plate abuts against the bottom of the keel. The bending part includes a vertically arranged first connecting plate and a horizontally arranged second connecting plate connected to one end of the first connecting plate, which is arranged in an L shape. One side of the vertically arranged first connecting plate abuts against the inner side of the assembly part of the U-shaped keel, and the bottom of the U-shaped keel is placed on the upper end of the horizontally arranged second connecting plate. The first handle is arranged at one side end of the second connecting plate. In this way, when the first handle is pulled outwards, the acting force will be applied to the inner side of the assembly part of the U-shaped keel through the second connecting plate, thereby driving it to fold outwards;

[0023] (4) The clamping grooves of the bending tool are two clamping grooves respectively engaged with both sides of the U-shaped keel, and the stretching devices are two stretching devices arranged back to back. Since the U-shaped keel is a symmetric structure, both sides of the U-shaped keel need to be assembled with other structures during use. Therefore, assembly parts that need to be bent are provided at both ends of the U-shaped keel. Two clamping grooves respectively engaged with both sides of the U-shaped keel are provided on the limiting device, so that the limiting device can fix both sides of the U-shaped keel at the same time. Two stretching devices arranged back to back are provided at both ends of the U-shaped keel. When the two stretching devices are simultaneously stretched outwards, the assembly parts at both ends of the U-shaped keel can be bent simultaneously, thereby improving the working efficiency of the bending tool.

[0024] (5) The cutting device of the bending tool includes a tool bit and a second handle connected to one end of the tool bit. The cutting device is used to cut the U-shaped keel, so that the side ends of the assembly part of the U-shaped keel except the upper end are separated from the U-shaped keel body. Therefore, the cutting device needs to be made of alloy steel with a relatively hard material. However, alloy steel with a relatively hard material is relatively expensive. If the entire cutting device is made of this material, it will lead to a relatively high cost and low practicability of the bending tool. Therefore, the cutting device is set to include a tool bit and a second handle connected to one end of the tool bit. The tool bit is used to cut the U-shaped keel, and only the material of the tool bit needs to be set as alloy steel with a relatively hard material. The second handle is provided to facilitate the use of the cutting device. Therefore, other relatively inexpensive steel materials are selected for manufacturing, which can greatly save costs and improve the practicability of the tool.

[0025] (6) The tool bit of the bending tool is a triangular tool bit, and the second handle is connected to one side of the triangular tool bit. The other two sides of the triangular tool bit that are not connected to the second handle can both be used to cut the keel, and the included angle between the other two sides of the triangular tool bit that are not connected to the second handle is between 0 and 90°. The tool bit is set as a triangular tool bit, and the second handle is connected to one side of the triangular tool bit. The other two sides of the triangular tool bit can both be used to cut the U-shaped keel. This setting is to enhance the practicability of the tool bit. When the cutting edge of one side of the triangular tool bit is worn, the other side can still be used for cutting, so that the cutting device will not become unusable. The included angle between the two sides of the triangular tool bit with cutting edges is between 0 and 90° because the side wings at the bottom of the U-shaped keel are perpendicular to the U-shaped keel. If the included angle between the two sides of the triangular tool bit with cutting edges is greater than 90°, the side wings at the bottom of the U-shaped keel cannot be cut. Description of the Drawings

[0026] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0027] Figure 1 Schematic diagram of the use of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0028] Figure 2 Schematic structural diagram of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0029] Figure 3 Schematic structural diagram of a stretching device of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0030] Figure 4 Schematic structural diagram of a limiting device of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0031] Figure 5 Schematic structural diagram of a cutting device of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0032] Figure 6 Schematic diagrams of the U-shaped keel before and after bending of a U-shaped keel bending tool and its use method according to an embodiment of the present invention;

[0033] Figure 7 Front view of the U-shaped keel after bending of a U-shaped keel bending tool and its use method according to an embodiment of the present invention.

[0034] In the figure: 1. U-shaped keel; 11. Assembly part; 12. Accommodation cavity; 2. Stretching device; 21. Bending part; 211. First connecting plate; 212. Second connecting plate; 22. First handle; 3. Limiting device; 31. Card slot; 4. Cutting device; 41. Tool bit; 42. Second handle. Detailed implementation manners

[0035] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] A U-shaped keel bending tool according to an embodiment of the present invention bends the assembly part 11 of the U-shaped keel 1, and includes a stretching device 2 for bending the assembly part 11 of the U-shaped keel 1 when it is stretched outwards, a limiting device 3 placed above the stretching device 2 for limiting the U-shaped keel 1, and a cutting device 4 for cutting the U-shaped keel 1. For specific effects, see Figure 1 、 Figure 2 、 Figure 6 and Figure 7In this application, the limiting device 3 placed above the stretching device 2 fixes the upper part of the U-shaped keel 1 that does not need to be bent. Then, the cutting device 4 cuts and separates the assembly part 11 from the main body of the U-shaped keel 1, only keeping the upper end where the assembly part 11 contacts the limiting device 3 connected to the main body of the U-shaped keel 1. After cutting, the stretching device 2 is horizontally moved outwards, thereby driving the assembly part 11 of the U-shaped keel 1 to fold along the upper end in contact with the limiting device 3. When the stretching device 2 is removed from the U-shaped keel 1, the assembly part 11 just folds 90° from the vertical state to the horizontal state. At this time, the accommodation cavity 12 formed by the assembly part 11 and the main body of the U-shaped keel 1 can be used for assembling with other structures.

[0037] In this embodiment, the stretching device 2 includes a bending part 21 and a first handle 22 provided at one end of the bending part 21 for outward stretching. For specific effects, see Figure 3 When the stretching device 2 is in use, the bending part 21 abuts against the inner side of the assembly part 11 of the U-shaped keel 1, and the first handle 22 is connected to the horizontally arranged end of the bending part 21. After the cutting device 4 cuts and separates the assembly part 11 from the main body of the U-shaped keel 1, only the upper end of the assembly part 11 is retained and connected to the main body of the U-shaped keel 1. Since the limiting device 3 fixes the main body of the U-shaped keel 1 at the upper end of the assembly part 11, when the first handle 22 is horizontally moved outwards, it will drive the bending part 21 to move horizontally, thereby driving the assembly part 11 to fold along the upper end in contact with the limiting device 3.

[0038] In this embodiment, the bending part 21 includes a vertically arranged first connecting plate 211 and a horizontally arranged second connecting plate 212 connected to one end of the first connecting plate 211. The first handle 22 is provided at the end of the second connecting plate 212 far from the first connecting plate 211. One side of the first connecting plate 211 close to the second connecting plate 212 abuts against an inner side of the U-shaped keel 1, and the upper end surface of the second connecting plate 212 abuts against the bottom of the U-shaped keel 1. For specific effects, see Figure 1 and Figure 3 The bending part 21 includes a vertically arranged first connecting plate 211 and a horizontally arranged second connecting plate 212 connected to one end of the first connecting plate 211, arranged in an L shape. One side of the vertically arranged first connecting plate 211 abuts against the inner side of the assembly part 11 of the U-shaped keel 1, and the bottom of the U-shaped keel 1 is placed on the upper end of the horizontally arranged second connecting plate 212. The first handle 22 is arranged at one side end of the second connecting plate 212. In this way, when the first handle 22 is pulled outwards, the acting force will be applied to the inner side of the assembly part 11 of the U-shaped keel 1 through the second connecting plate 212, thereby driving it to fold outwards.

[0039] In this embodiment, a clamping groove 31 for clamping with one side of the U-shaped keel 1 is provided on the limiting device 3. For specific effects, seeFigure 4 The limiting device 3 is used to fix the part of the U-shaped keel 1 that does not need to be bent. Therefore, a clamping groove 31 penetrating through the limiting device 3 is provided on the limiting device 3. The clamping groove 31 is clamped with one side of the U-shaped keel 1, and is clamped at the junction of the upper end of the assembly part 11 of the U-shaped keel 1 and the main body of the U-shaped keel 1. The bottom of the clamping groove 31 just coincides with the junction. In this way, when the stretching device 2 bends the assembly part 11 of the U-shaped keel 1, the limiting device 3 restricts the main body of the U-shaped keel 1 to fold along with the assembly part 11 at the junction of the upper end of the assembly part 11 of the U-shaped keel 1 and the main body of the U-shaped keel 1, so that the tool can accurately bend the assembly part 11 of the U-shaped keel 1.

[0040] In this embodiment, the clamping grooves 31 are two clamping grooves 31 respectively clamped with both sides of the U-shaped keel 1, and the stretching devices 2 are two stretching devices 2 arranged back to back. For the specific effect, see Figure 2 Since the U-shaped keel 1 is a symmetric structure, both sides of the U-shaped keel 1 need to be assembled with other structures during use. Therefore, assembly parts 11 that need to be bent are provided at both ends of the U-shaped keel 1. Two clamping grooves 31 respectively clamped with both sides of the U-shaped keel 1 are provided on the limiting device 3. In this way, the limiting device 3 can fix both sides of the U-shaped keel 1 at the same time. Two stretching devices 2 arranged back to back are provided at both ends of the U-shaped keel 1. When the two stretching devices 2 are stretched outward at the same time, the assembly parts 11 at both ends of the U-shaped keel 1 can be bent at the same time, thus improving the working efficiency of the bending tool.

[0041] The two clamping grooves 31 are evenly distributed on the limiting device 3, and the distance between the two clamping grooves 31 and the edge of the limiting device 3 is not less than the thickness of the clamping groove 31. For the specific effect, see Figure 4 The limiting device 3 fixes both ends of the U-shaped keel 1 through the two clamping grooves 31. When the stretching device 2 bends the assembly part 11 of the U-shaped keel 1, the acting force applied by the stretching device 2 on the assembly part 11 of the U-shaped keel 1 will also be transmitted to the clamping groove 31. Therefore, the distance between the clamping groove 31 and the edge of the limiting device 3 cannot be too small to prevent the force applied by the stretching device 2 from breaking the clamping groove 31 and causing the limiting device 3 to be unusable. Therefore, the distance between the two clamping grooves 31 and the edge of the limiting device 3 is set to be not less than the thickness of the clamping groove 31 to enhance the bearing capacity of the clamping groove 31. And the two clamping grooves 31 are evenly distributed on the limiting device 3 to make the force applied by the stretching device 2 evenly distributed on the limiting device 3, thereby enhancing the structural stability of the limiting device 3.

[0042] In this embodiment, the cutting device 4 includes a cutter head 41 and a second handle 42 connected to one end of the cutter head 41. For the specific effect, see Figure 5。The cutting device 4 is used to cut the U-shaped keel 1 so that the assembly part 11 of the U-shaped keel 1 is separated from the main body of the U-shaped keel 1 except for the upper end of other side ends. Therefore, the cutting device 4 needs to be made of alloy steel with a relatively hard material. However, the alloy steel with a relatively hard material is relatively expensive. If the entire cutting device uses this material, it will lead to a higher cost and lower practicability of the bending tool. Therefore, the cutting device 4 is set to include a tool bit 41 and a second handle 42 connected to one end of the tool bit 41. When using the tool bit 41 to cut the U-shaped keel 1, only the material of the tool bit 41 needs to be set as alloy steel with a relatively hard material, and the second handle 42 is set to facilitate the use of the cutting device. Therefore, other cheaper steel materials are selected for manufacturing, which can save costs to a great extent and improve the practicability of the tool.

[0043] The tool bit 41 is a triangular tool bit, and the second handle 42 is connected to one side of the triangular tool bit. The other two sides of the triangular tool bit that are not connected to the second handle 42 can be used to cut the U-shaped keel 1. The included angle between the other two sides of the triangular tool bit that are not connected to the second handle 42 is between 0 and 90°. For the specific effect, see Figure 5 。The tool bit 41 is set as a triangular tool bit, and the second handle 42 is connected to one side of the triangular tool bit. The other two sides of the triangular tool bit can be used to cut the U-shaped keel 1. This setting is to enhance the practicability of the tool bit 41. When the cutting edge on one side of the triangular tool bit is worn, the other side can still be used for cutting, so that the cutting device will not become unusable. The included angle between the two sides of the triangular tool bit with cutting edges is between 0 and 90° because the side wings at the bottom of the U-shaped keel 1 are perpendicular to the U-shaped keel 1. If the included angle between the two sides of the triangular tool bit with cutting edges is greater than 90°, the side wings at the bottom of the U-shaped keel cannot be cut.

[0044] The distance between the upper end surface of the first connecting plate 211 and the upper end surface of the second connecting plate 212 is equal to the thickness of the 40-aluminum edge trim. For the specific effect, see Figure 1 and Figure 7 。In the prefabricated suspended ceiling, the most commonly used is the U-shaped keel and 40-aluminum assembly for edge trimming. The thickness of the 40-aluminum edge trim is 10 mm. Since the distance between the upper end surface of the first connecting plate 211 and the upper end surface of the second connecting plate 212 is equal to the width of the accommodation cavity 12 formed between the assembly part 11 of the U-shaped keel 1 after bending and the main body of the U-shaped keel 1, the distance between the upper end surface of the first connecting plate 211 and the upper end surface of the second connecting plate 212 is set to 10 mm, which is the same as the thickness of the 40-aluminum edge trim. In this way, it can be ensured that the 40-aluminum can just be assembled with the accommodation cavity 12.

[0045] A method for using a U-shaped keel bending tool includes the following steps:

[0046] S1: Clamp the U-shaped keel in the card slot of the limiting device for limiting;

[0047] S2: Cut both wings of the U-shaped keel with a cutting device;

[0048] S3: Translate the stretching devices on both sides outward until the U-shaped keel is formed;

[0049] S4: Remove the bending tool.

[0050] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present invention.

[0051] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A U-shaped keel bending tool for bending the assembly part (11) of a U-shaped keel (1), characterized in that: It includes a stretching device (2) used to bend the U-shaped keel (1) when it is stretched outwards, a limiting device (3) placed above the stretching device (2) for limiting the U-shaped keel (1), and a cutting device (4) for cutting the U-shaped keel (1); The cutting device (4) partially cuts the U-shaped keel (1) to form an assembly part (11) integrally connected to the upper end of the U-shaped keel (1). The stretching device (2) stretches outwards to bend the assembly part (11), and the limiting device (3) remains fixed during the bending process of the assembly part (11) to limit the assembly part (11), so that the assembly part (11) is bent from a vertical state to a horizontal state along the upper edge line; The stretching device (2) includes a bending part (21) and a first handle (22) provided at one end of the bending part (21) for stretching outwards; The bending part (21) includes a first connecting plate (211) erected vertically and a second connecting plate (212) connected to one end of the first connecting plate (211) and erected horizontally. The first handle (22) is provided at the end of the second connecting plate (212) far from the first connecting plate (211). One side surface of the first connecting plate (211) close to the second connecting plate (212) abuts against an inner side surface of the U-shaped keel (1), and the upper end surface of the second connecting plate (212) abuts against the bottom of the U-shaped keel (1).

2. The zigzag-shaped keel bending tool according to claim 1, characterized in that: A clamping groove (31) for clamping with one side of the U-shaped keel (1) is provided on the limiting device (3).

3. The zigzag-shaped keel bending tool according to claim 2, characterized in that: The clamping groove (31) is two clamping grooves (31) respectively clamping with both sides of the U-shaped keel (1), and the stretching device (2) is two stretching devices (2) arranged back to back.

4. The zigzag-shaped keel bending tool according to claim 3, characterized in that: The two clamping grooves (31) are evenly distributed on the limiting device (3), and the distance between the two clamping grooves (31) and the edge of the limiting device (3) is not less than the thickness of the clamping groove (31).

5. The zigzag-shaped keel bending tool according to claim 1, characterized in that: The cutting device (4) includes a cutter head (41) and a second handle (42) connected to one end of the cutter head (41).

6. The zigzag-shaped keel bending tool according to claim 5, characterized in that: The cutter head (41) is a triangular cutter head. The second handle (42) is connected to one side of the triangular cutter head. The other two sides of the triangular cutter head not connected to the second handle can be used to cut the U-shaped keel (1), and the included angle between the other two sides of the triangular cutter head not connected to the second handle (42) is between 0 and 90°.

7. The zigzag-shaped keel bending tool according to claim 1, wherein: The distance between the upper end surface of the first connecting plate (211) and the upper end surface of the second connecting plate (212) is equal to the thickness of the 40 aluminum edge trim.

8. The usage method of a U-shaped keel bending tool according to any one of claims 1-7, characterized in that, It includes the following steps: S1: Clamp the U-shaped keel in the clamping groove of the limiting device for limiting; S2: Use the cutting device to cut the two wings of the U-shaped keel; S3: Translate the stretching devices on both sides outwards until the U-shaped keel is formed; S4: Remove the bending tool.

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