Special-shaped bolt

Abstract

The utility model belongs to the technical field of special-shaped bolts, and particularly relates to a special-shaped bolt. Comprising a U-shaped bolt, the U-shaped bolt is composed of a U-shaped rod and screw rods arranged at the two ends of the U-shaped rod, and the two screw rods are parallel to each other; the end, where the head is located, of the screw rod is of a hollow and sectioned structure capable of being contracted in the radial direction, the screw rod is provided with a plurality of radial contraction structures, and the radial contraction structures can be contracted or expanded in the radial direction according to the inner diameter of a bolt hole when the U-shaped bolt is installed, so that close fit with the inner wall of the bolt hole is achieved. The radial shrinkage structure comprises an elastic element, the elastic element is arranged at the lower end of the screw rod and extends in the radial direction of the screw rod, and the elastic element can generate elastic deformation when the U-shaped bolt is fastened so as to adapt to different bolt hole inner diameters. The utility model provides a special-shaped bolt which can be contracted in the radial direction so as to be matched with the inner diameter of a bolt hole and achieve accurate fastening.

Description

Technical Field

[0001] The utility model belongs to the technical field of special-shaped bolts, in particular to a special-shaped bolt. Background Art

[0002] Bolts are a basic fastener widely used in industries such as machinery, construction, electronics, and aviation. They typically consist of a cylindrical screw with external threads and a head. Bolts, when combined with matching nuts, secure parts together. Their removable design facilitates maintenance and replacement. Bolted connections are a common form of removable connection, characterized by their simple structure, low cost, and easy disassembly. They are widely used in various engineering equipment.

[0003] In traditional standard bolt design, the thread dimensions of bolts and nuts are typically strictly processed according to unified standards to ensure a precise fit between the bolts and nuts. However, with the advancement of technology and evolving industry demands, a number of specialized bolts have emerged on the market. These specialized bolts are often used in specific projects or equipment, featuring shapes, sizes, or structures that differ from conventional bolts to accommodate unique working environments or load requirements.

[0004] However, due to the relatively complex design and processing of special-shaped bolts, there can be some error in the bolt hole precision and the bolt's outer diameter. This error can cause the bolt to not perfectly fit the bolt hole during use, leading to loosening and unstable fastening. Specifically, if the bolt and nut don't fit precisely, the bolt may slip or deflect in the bolt hole, affecting the stability and reliability of the entire fastening connection and posing a safety hazard. Utility Model Content

[0005] The purpose of the utility model is to solve the above-mentioned technical problems and provide a special-shaped bolt that can be radially contracted to adapt to the inner diameter of the bolt hole and achieve precise tightening.

[0006] In view of this, the present invention provides a special-shaped bolt, comprising:

[0007] U-bolts, which consist of a U-shaped rod and screws at both ends of the U-shaped rod, with the two screws parallel to each other;

[0008] The nut is arranged on the screw and cooperates with the screw thread to achieve a fastening connection;

[0009] a bolt head disposed on the U-shaped rod and located at the top of the screw, the bolt head having a tool contact surface for applying torque;

[0010] The head of the screw rod is of a hollow, split, radially contractible structure, the screw rod has a plurality of radially contractible structures, the radially contractible structures can be radially contracted or expanded according to the inner diameter of the bolt hole when the U-shaped bolt is installed, so as to realize the close fit with the inner wall of the bolt hole;

[0011] The radially contractible structure comprises an elastic element arranged at the lower end of the screw rod and extending in the radial direction of the screw rod, and the elastic element can be elastically deformed when the U-shaped bolt is fastened to adapt to different inner diameters of the bolt hole.

[0012] The elastic element is made of an elastically deformable material and can provide moderate pressure during installation and disassembly, thereby ensuring the stability and fastening effect of the bolt in the bolt hole.

[0013] In the above technical solution, further, the radially contractible structure of the bolt is a plurality of annularly distributed strip-shaped cutouts, the strip-shaped cutouts are uniformly distributed along the outer periphery of the screw rod portion, and each strip-shaped cutout internally accommodates an elastic element for adjusting the radial size of the screw rod.

[0014] In any of the above technical solutions, further, a reinforcing rib is arranged between the screw rod and the bolt head, and the reinforcing rib is uniformly and spacedly distributed in the circumferential direction of the screw rod.

[0015] In any of the above technical solutions, further, a gasket is arranged on the screw rod, and a through slot adapted to the reinforcing rib is formed in the gasket so that the gasket is not affected by the reinforcing rib.

[0016] In any of the above technical solutions, further, an anti-theft assembly is arranged on the outer side of the nut, and the anti-theft assembly comprises:

[0017] A fastening ring is sleeved on the outer side of the nut.

[0018] A connecting plate is arranged between the two fastening rings.

[0019] A positioning hole is formed in the fastening ring.

[0020] A fixing hole is formed in the nut, and the fixing hole is arranged opposite to the positioning hole.

[0021] A bolt is slidingly arranged between the positioning hole and the fixing hole.

[0022] In any of the above technical solutions, further, a limiting groove adapted to the outer corner of the nut is arranged in the fastening ring.

[0023] The beneficial effects of the utility model are:

[0024] 1. Because the screw is hollow, split, and radially shrinkable, the bolt can be adaptively adjusted according to the inner diameter of different bolt holes during installation. The radial shrinkage structure automatically generates elastic deformation during the tightening process through the action of the elastic element, allowing the bolt to contact the inner wall of the bolt hole more closely, ensuring the stability of the connection, increasing the friction between the bolt and the bolt hole, and preventing loosening caused by load, vibration, or external force, thereby improving the stability and safety of the connection;

[0025] 2. When the bolt is screwed into the bolt hole, the elastic element of the cutout deforms elastically, causing the outer diameter of the screw to change, thereby achieving close contact with the inner wall of the bolt hole. The radial contraction structure of the screw enables the bolt to maintain continuous pressure on the inner wall of the bolt hole after tightening, reducing the risk of loosening due to vibration or external force, and enhancing the anti-loosening ability of the connection;

[0026] 3. The reinforcement ribs increase the tensile and compressive strength of the screw, avoiding local damage when the screw is subjected to large external forces. They can effectively reduce the deformation of the screw, making the screw more stable during use and less susceptible to plastic deformation due to load.

[0027] 4. By adding fastening rings, connecting plates, positioning holes, fixing holes and latches to the outside of the nut, the nut can be fixed smoothly under normal use. However, if it needs to be disassembled, only personnel with specific tools or permissions can operate it. The purpose of this design is to increase the difficulty of disassembly and enhance the safety of the nut and bolt connection;

[0028] 5. The design of the limit groove can limit the rotation of the nut after installation and prevent the nut from loosening due to external force or vibration. The cooperation between the limit groove and the outer angle of the nut can effectively fix the nut and ensure that the fastening force will not be weakened by vibration or external disturbance. The limit groove can ensure the accurate connection position between the nut and the screw, thereby enhancing the overall fastening effect of the screw connection and reducing assembly errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the first three-dimensional structure of the utility model;

[0030] Figure 2 This is a schematic diagram of the second three-dimensional structure of the utility model;

[0031] Figure 3 It is a schematic diagram of a partial three-dimensional structure of the utility model;

[0032] Figure 4 This is a partial three-dimensional structural diagram of the anti-theft component of the utility model;

[0033] In the figure, the reference signs are: 1, U-shaped bolt; 11, U-shaped rod; 12, screw rod; 2, nut; 3, bolt head; 4, radial contraction structure; 41, elastic element; 42, strip-shaped cutout; 5, reinforcing rib; 6, washer; 7, through groove; 8, anti-theft assembly; 81, fastening ring; 82, connecting plate; 83, positioning hole; 84, fixing hole; 85, bolt; 9, limiting groove. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0035] In the description of the present application, it should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be regarded as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0036] Embodiment 1

[0037] As shown in the figure, the present embodiment provides a special-shaped bolt, comprising: Figures 1-3

[0038] U-shaped bolt 1, the U-shaped bolt 1 is composed of a U-shaped rod 11 and screw rods 12 arranged at both ends of the U-shaped rod 11, and the two screw rods 12 are parallel to each other;

[0039] Nut 2, arranged on the screw rod 12 and threadedly matched with the screw rod 12 to realize fastening connection;

[0040] Bolt head 3, arranged on the U-shaped rod 11 and located at the top of the screw rod 12, the bolt head 3 has a tool contact surface for applying torque;

[0041] ​The head of the screw rod 12 is a hollow, split, and radially contractible structure. The screw rod 12 has a plurality of radially contractible structures 4 that can be radially contracted or expanded according to the inner diameter of the bolt hole during installation of the U-shaped bolt 1, thereby achieving a close fit with the inner wall of the bolt hole.

[0042] The radially contractible structure 4 includes an elastic element 41 arranged at the lower end of the screw rod 12 and extending in the radial direction of the screw rod 12. The elastic element 41 can be elastically deformed during tightening of the U-shaped bolt 1 to adapt to different inner diameters of the bolt hole.

[0043] The elastic element 41 is made of a material that can be elastically deformed, providing moderate pressure during installation and disassembly, thereby ensuring the stability and tightening effect of the bolt in the bolt hole.

[0044] In the present technical solution, the screw rod 12 can be self-adaptively adjusted according to the change in the inner diameter of the bolt hole, ensuring a close fit between the screw rod 12 and the bolt hole and eliminating the influence of thread errors on connection stability. Through the action of the elastic element 41, the screw rod 12 can be elastically deformed appropriately during installation, forming a more stable connection between the screw rod 12 and the bolt hole and preventing loosening. This design enables the special-shaped bolt 1 to adapt to bolt holes of different specifications, having strong universality, especially suitable for various mechanical or engineering applications, thereby improving its application range and reliability. Even after long-term use, the screw rod 12 can still ensure that it is not affected by jamming or excessive tightening during disassembly, prolonging its service life.

[0045] Due to the hollow, split, and radially contractible structure of the screw rod 12, the screw rod 12 can be adaptively adjusted according to the inner diameter of different bolt holes during installation. The radially contractible structure 4 automatically elastically deforms during tightening through the action of the elastic element 41, enabling the bolt to be in closer contact with the inner wall of the bolt hole and ensuring the stability of the connection. The elastic element 41 enables the bolt to apply moderate pressure during tightening, increasing the friction between the bolt and the bolt hole and preventing loosening due to load, vibration, or external force, thereby improving the stability and safety of the connection. The radially contractible structure 4 of the bolt can be self-adaptively adjusted according to the inner diameter of different bolt holes, enabling the bolt to adapt to various bolt hole sizes and having strong universality. In this way, even if the bolt hole size deviates slightly, the elastic element 41 can be adjusted to ensure a good fit. The design of the elastic element 41 also ensures that the bolt can be easily disassembled without being excessively tightened or jammed. During use, the bolt can provide a certain elasticity and cushioning, thereby facilitating later maintenance and replacement.

[0046] Work flow: During installation, confirm the specifications of the bolt to ensure that the length and size of the bolt are suitable for the parts to be connected. Place the U-shaped bolt 1 in the appropriate position of the parts to be connected, ensure that the shank 12 part of the bolt is aligned with the bolt hole, and push the U-shaped rod 11 or the bolt head 3 part. As the pushing proceeds, the shank 12 begins to contact the inner wall of the bolt hole. In this process, the elastic element 41 of the radial contraction structure 4 of the shank 12 produces elastic deformation, and the shank 12 will adaptively contract or expand according to the change of the inner diameter of the bolt hole, to ensure that the shank 12 is tightly fitted with the bolt hole. The design of the elastic element 41 can ensure a moderate pressure, so that the bolt and the bolt hole maintain good friction force and prevent loosening. During the tightening of the shank 12, the elastic element 41 continuously provides moderate elastic deformation, so that the shank 12 and the bolt hole maintain stable contact force. At this time, the radial contraction structure 4 effectively adapts to the size change of the bolt hole, ensuring stable tightening effect and avoiding loosening problem caused by incomplete matching of the inner diameter of the bolt hole, then tighten the nut 2 on the shank 12, when disassembly is needed, rotate the nut 2, the nut 2 will gradually loosen. Due to the effect of the elastic element 41, the bolt can appropriately reduce the elastic pressure of the inner diameter, making the disassembly process easier and avoiding the problem of jam caused by excessive tightening. In addition, the elastic element 41 can also ensure that the contact pressure between the bolt and the bolt hole is moderate, so as not to damage the bolt hole during disassembly.

[0047] As shown in Figures 1-3 In this embodiment, the optimized radial contraction structure 4 of the bolt is a plurality of annularly distributed strip-shaped notches 42, which are uniformly distributed along the outer periphery of the shank 12 part, and each strip-shaped notch 42 contains an elastic element 41 inside for adjusting the radial size of the shank 12.

[0048] In this technical solution, when the bolt is screwed into the bolt hole, the elastic element 41 of the notch produces elastic deformation, causing the outer diameter of the shank 12 to change, thereby realizing close contact with the inner wall of the bolt hole. This structure design enables the bolt to automatically adapt to different bolt hole sizes during tightening, improving the versatility and adaptability of the bolt. Since the elastic element 41 can exert appropriate radial pressure, the contact pressure between the bolt and the bolt hole remains stable, thereby enhancing the stability of the connection. This design effectively avoids the loosening problem caused by the loose fit between the shank 12 and the bolt hole, ensuring that the connection remains firm for a long time. The radial contraction structure 4 of the shank 12 enables the bolt to maintain continuous pressure on the inner wall of the bolt hole after tightening, reducing the risk of loosening caused by vibration or external force, and enhancing the anti-loosening ability of the connection. The elastic element 41 can automatically adjust the fit between the shank 12 and the bolt hole according to the radial contraction of the shank 12, regardless of the slight deviation of the inner diameter of the bolt hole, ensuring a tight fit, thereby improving the applicability of the bolt.

[0049] Embodiment 2:

[0050] The embodiment provides a special-shaped bolt, in addition to comprising the technical scheme of the above embodiment, further having the following technical features.

[0051] As shown in Figure 2 and Figure 3 In the embodiment, the optimized reinforcing ribs 5 are arranged between the screw rod 12 and the bolt head 3, and the reinforcing ribs 5 are four in total and are uniformly and spacedly distributed in the circumferential direction of the screw rod 12.

[0052] In the technical scheme, the reinforcing ribs 5 increase the tensile strength and the compressive strength of the screw rod 12, so that local damage of the screw rod 12 is avoided when the screw rod 12 bears a large external force. The reinforcing ribs 5 arranged between the bolt head 3 and the screw rod 12 can effectively reduce the deformation of the screw rod 12, so that the screw rod 12 is more stable in the use process and is not prone to plastic deformation caused by the load. Since the reinforcing ribs 5 are uniformly and spacedly distributed in the circumferential direction of the screw rod 12, the load can be uniformly distributed on the entire surface of the screw rod 12, so that local excessive force is avoided, thereby improving the service life and safety of the screw rod 12. After the reinforcing ribs 5 are added to the connecting position of the screw rod 12, fatigue damage caused by frequent force and unloading can be slowed down, especially in the case of vibration or repeated load, and the working life of the screw rod 12 can be significantly prolonged by the design.

[0053] As shown in Figure 1 and Figure 3 In the embodiment, the optimized reinforcing ribs 5 are arranged between the screw rod 12 and the bolt head 3, and the reinforcing ribs 5 are four in total and are uniformly and spacedly distributed in the circumferential direction of the screw rod 12.

[0054] In the technical scheme, the reinforcing ribs 5 increase the tensile strength and the compressive strength of the screw rod 12, so that local damage of the screw rod 12 is avoided when the screw rod 12 bears a large external force. The reinforcing ribs 5 arranged between the bolt head 3 and the screw rod 12 can effectively reduce the deformation of the screw rod 12, so that the screw rod 12 is more stable in the use process and is not prone to plastic deformation caused by the load. Since the reinforcing ribs 5 are uniformly and spacedly distributed in the circumferential direction of the screw rod 12, the load can be uniformly distributed on the entire surface of the screw rod 12, so that local excessive force is avoided, thereby improving the service life and safety of the screw rod 12. After the reinforcing ribs 5 are added to the connecting position of the screw rod 12, fatigue damage caused by frequent force and unloading can be slowed down, especially in the case of vibration or repeated load, and the working life of the screw rod 12 can be significantly prolonged by the design.

[0055] In the technical scheme, the reinforcing ribs 5 increase the tensile strength and the compressive strength of the screw rod 12, so that local damage of the screw rod 12 is avoided when the screw rod 12 bears a large external force. The reinforcing ribs 5 arranged between the bolt head 3 and the screw rod 12 can effectively reduce the deformation of the screw rod 12, so that the screw rod 12 is more stable in the use process and is not prone to plastic deformation caused by the load. Since the reinforcing ribs 5 are uniformly and spacedly distributed in the circumferential direction of the screw rod 12, the load can be uniformly distributed on the entire surface of the screw rod 12, so that local excessive force is avoided, thereby improving the service life and safety of the screw rod 12. After the reinforcing ribs 5 are added to the connecting position of the screw rod 12, fatigue damage caused by frequent force and unloading can be slowed down, especially in the case of vibration or repeated load, and the working life of the screw rod 12 can be significantly prolonged by the design.

[0056] Example 3:

[0057] This embodiment provides a special-shaped bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0058] like Figures 1-4 As shown, in this embodiment, an anti-theft component 8 is provided on the outside of the nut 2 in an optimized manner. The anti-theft component 8 includes:

[0059] The fastening ring 81 is sleeved on the outside of the nut 2;

[0060] The connecting plate 82 is provided between the two fastening rings 81;

[0061] A positioning hole 83 is provided on the fastening ring 81;

[0062] A fixing hole 84 is formed on the nut 2 and is arranged opposite to the positioning hole 83;

[0063] The latch 85 is slidably disposed between the positioning hole 83 and the fixing hole 84 .

[0064] In this technical solution, the anti-theft assembly 8 is constructed by adding a fastening ring 81, a connecting plate 82, a positioning hole 83, a fixing hole 84, and a latch 85 to the outside of the nut 2. This allows the nut 2 to be securely fixed during normal use, but only personnel with specific tools or authorization can remove it. This design is intended to make removal more difficult and enhance the security of the connection between the nut 2 and the bolt.

[0065] Work flow: In the design of the bolt and nut 2, the nut 2 outside the pre-set fixed hole 84 and positioning hole 83, while preparing the appropriate fastening ring 81 and connecting plate 82. Fastening ring 81 through the pre-set size and design, set in the nut 2 outside, while the connecting plate 82 is fixed by installing between the two fastening ring 81 to fix the entire anti-theft assembly 8. Fastening ring 81, connecting plate 82 and nut 2 combined together, to ensure that the fastening ring 81 and nut 2 outside the firm combination, prevent loose. In the process, positioning hole 83 and fixed hole 84 butt joint, bolt 85 into the positioning hole 83 and by sliding into the fixed hole 84 of the nut 2, thus fixing the entire anti-theft assembly 8. In the assembly process of anti-theft assembly 8, bolt 85 ensures the position of the fastening ring 81, so that the nut 2 is not easy to disassemble. After the bolt 85 is completely inserted, the connection between the nut 2 and the fastening ring 81 cannot be easily removed, and the presence of the bolt 85 makes it difficult to remove the nut 2 even under external force, thereby increasing the difficulty of disassembly. At this time, the anti-theft device has achieved its purpose, and the nut 2 is in a safe and stable state. To disassemble such anti-theft bolts, special tools must be used to remove the bolt 85. The bolt 85 is slid between the positioning hole 83 and the fixed hole 84, ensuring that only personnel with special tools can disassemble the bolt, thereby effectively preventing unauthorized disassembly. In normal use, the anti-theft assembly 8 always keeps the nut 2 fixed in place.

[0066] As shown in Figure 3 and Figure 4 In this embodiment, the optimized fastening ring 81 is provided with a limiting groove 9 matched with the outer corner of the nut 2.

[0067] In this technical solution, the limiting groove 9 can limit the rotation of the nut 2 after installation, preventing the nut 2 from loosening due to external force or vibration. When the screw rod 12 is screwed into the nut 2, the limiting groove 9 cooperates with the outer corner of the nut 2 to effectively fix the nut 2, ensuring that the fastening force will not be weakened by vibration or external disturbance. The limiting groove 9 can ensure the accurate connection position of the nut 2 and the screw rod 12, thereby enhancing the overall fastening effect of the screw rod 12 connection and reducing assembly errors.

[0068] Workflow: First, insert the irregular bolt 1 into the predetermined position, one end of the screw rod 12 is connected with the nut 2. When the nut 2 is screwed in, the outer corner of the nut 2 will be in contact with the limiting groove 9 inside the fastening ring 81. At this time, the limiting groove 9 will guide and limit the rotation of the nut 2 to a certain extent, preventing the nut 2 from shifting or unstable rotation during the rotation of the screw rod 12. As the nut 2 continues to rotate to the fastening state, the cooperation of the limiting groove 9 and the outer corner of the nut 2 ensures that the nut 2 will not be further loosened. The effect of this cooperation is that the nut 2 is more stable during the fastening process, providing effective anti-loose protection. Even in a high-vibration or external force environment, the presence of the limiting groove 9 can ensure the stability of the connection between the nut 2 and the screw rod 12, avoiding the risk of nut 2 loosening or connection failure.

[0069] The embodiments of the present application are described above in conjunction with the drawings, and the embodiments and features in the present application can be combined with each other without conflict, and the present application is not limited to the specific embodiments described above. The specific embodiments described above are only illustrative, not restrictive, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A special bolt characterized in that, The utility model relates to a U bolt (1) is composed of U type pole (11) and the screw rod (12) of setting at both ends of U type pole (11), two screw rod (12) parallel with each other, nut (2) is set up on screw rod (12) with screw rod (12) threaded cooperation realizes fastening connection, bolt head (3) is set up on U type pole (11) and is located at the top of screw rod (12), and bolt head (3) has the tool contact surface for exerting torque, the head of screw rod (12) is hollow, and the split, radially contractible structure, screw rod (12) has multiple radial contraction structure (4), and radial contraction structure (4) can contract or expand radially according to the inner diameter of bolt hole when installing U bolt (1), thereby realizing the close cooperation with bolt hole inner wall, radial contraction structure (4) includes elastic element (41), which is arranged at the lower end of screw rod (12) and extends in the radial direction of screw rod (12), and the elastic element (41) can be elastically deformed to adapt to different bolt hole inner diameters when the U bolt (1) is fastened, the elastic element (41) is elastically deformable material, which can provide moderate pressure during installation and disassembly, thereby ensuring the stability and fastening effect of the bolt in the bolt hole, the radial contraction structure (4) of the bolt is multiple annularly distributed strip-shaped cutouts (42), the strip-shaped cutouts (42) are uniformly distributed along the outer periphery of the screw rod (12) part, and each strip-shaped cutout (42) internally contains an elastic element (41) for adjusting the radial size of the screw rod (12). Reinforcing ribs (5) are arranged between the screw rod (12) and the bolt head (3), the reinforcing ribs (5) are four in total and are uniformly spaced along the circumferential direction of the screw rod (12). A washer (6) is arranged on the screw rod (12), the washer (6) is provided with a through groove (7) matched with the reinforcing ribs (5), so that the washer (6) is not affected by the reinforcing ribs (5). The outer side of the nut (2) is provided with an anti-theft assembly (8), the anti-theft assembly (8) comprises: A fastening ring (81) is sleeved on the outer side of the nut (2), A connecting plate (82) is arranged between the two fastening rings (81), A positioning hole (83) is formed on the fastening ring (81), 2. A profiled bolt according to claim 1, wherein A fixing hole (84) is formed on the nut (2), and the fixing hole (84) is arranged opposite to the positioning hole (83), 3. A profiled bolt according to claim 1, wherein A bolt (85) is slidingly arranged between the positioning hole (83) and the fixing hole (84).

4. A profiled bolt according to claim 3, wherein, The inner side of the fastening ring (81) is provided with a limiting groove (9) matched with the outer corner of the nut (2).

5. A profiled bolt according to claim 1, wherein ​ ​ ​ ​ ​ ​ 6. A profiled bolt according to claim 5, wherein, ​

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