An expansion bolt

Abstract

The application discloses an expansion bolt, and relates to the technical field of expansion bolt anti-falling; the expansion bolt comprises a bolt body, one end of the bolt body is provided with a connecting part, the connecting part is used for being connected with an external connecting piece, the other end of the bolt body is provided with an expansion part, a positioning hole is arranged in the expansion part, a plurality of communication grooves in communication with the positioning hole are arranged on the circumferential side of the expansion part, and the expansion part can be at least partially inserted into a mounting hole; a fastener is provided with a positioning part in the form of a conical surface; the positioning part can be inserted into the positioning hole and used for being mounted into the mounting hole; during the mounting into the mounting hole, the positioning part can move inward along the axis of the positioning hole, so that the circumferential side of the expansion part is expanded outward and is connected in interference in the mounting hole.

Description

Technical Field

[0001] This application belongs to the technical field of expansion bolt anti-loosening technology, specifically relating to an expansion bolt. Background Technology

[0002] Expansion bolts are special threaded fasteners used to fix pipes or equipment to walls, floors, or columns. Existing expansion bolts typically consist of an expansion sleeve and a bolt; in use, the expansion sleeve is first inserted into the installation hole in the concrete, and then the bolt is screwed into the expansion sleeve, causing the expansion sleeve to expand outwards and form an interference fit with the installation hole.

[0003] However, its structural design requires the expansion sleeve to be designed as a multi-segment structure. The grooves on the periphery of the expansion sleeve extend from the bottom to the top, which reduces the structural strength of the expansion sleeve and decreases its stability in actual use. Furthermore, existing expansion sleeves mostly use thin-walled structures with a thickness of about 0.5mm, and are mostly made of plastic materials, which limits the force they can withstand. Moreover, its working principle is to expand the expansion sleeve outward to fill the mounting hole under the action of the bolt. Therefore, it can only be installed in the original size mounting hole, and the bottom and periphery of the hole cannot be expanded on the basis of the original size mounting hole. The expansion sleeve fills the original size mounting hole, that is, the expansion sleeve expands to the same size as the inner diameter of the mounting hole. When the long-term repeated expansion and contraction and the external force it bears increase, the expansion sleeve is prone to detach from the mounting hole under the external force, which will cause the expansion bolt to fail. In severe cases, it may also cause the external connecting parts to fall off and be damaged. Utility Model Content

[0004] This application provides an expansion bolt to solve the problem that existing expansion bolts, where the expansion sleeve fills the mounting hole but cannot enlarge the bottom circumference of the original mounting hole, and the expansion sleeve fills the original size mounting hole (i.e., the radial dimension of the expansion sleeve is the same as that of the mounting hole), are prone to detaching from the mounting hole after long-term use or increased external force.

[0005] The technical solution adopted in this application is as follows: An expansion bolt, comprising: The bolt body has a connecting portion at one end for connecting with an external connector; the other end of the bolt body has an expansion portion with a positioning hole inside, and a plurality of communicating grooves connected to the positioning hole are formed on the periphery of the expansion portion, and the expansion portion can be at least partially inserted into the mounting hole. A fastener having a tapered positioning portion; the positioning portion can be inserted into the positioning hole for installation into the mounting hole, and during installation into the mounting hole, the positioning portion can move inward along the axis of the positioning hole, causing the expansion portion to expand outward and be interference-fitted into the mounting hole.

[0006] The bolt body includes a first connecting segment, a second connecting segment, and a third connecting segment; the first connecting segment forms a connecting portion for connection with external connectors; the second connecting segment connects the first connecting segment and the third connecting segment; the end of the third connecting segment away from the first connecting segment has an expansion portion of a predetermined length.

[0007] This application provides a connecting part for the bolt body to connect with an external connector, thereby fixing the external connector to a specific position using expansion bolts; the expansion part is used to mate with the mounting holes at fixed positions such as walls or plates, and the expansion part is used for the internal connection of the bolt body. The expansion portion of this application has a positioning hole for inserting a fastener. After the fastener is inserted into the positioning hole, the side of the bolt body connected to the fastener is inserted into the positioning hole. Then, by tapping the end of the bolt body near the connection portion, the expansion portion of the bolt body can extend into the mounting hole. As the bolt body is tapped and extended into the mounting hole, the fastener follows the bolt body into the mounting hole. When the bottom end of the fastener contacts the bottom wall of the mounting hole, the positioning portion of the fastener extends into the positioning hole of the expansion portion of the bolt body. Since the positioning portion of the fastener has a conical structure, and multiple connecting grooves are provided on the periphery of the expansion portion, the expansion portion is divided into a multi-segment structure. The fastener can extend inward along the axial direction of the positioning hole. When the conical positioning portion of the fastener continuously squeezes the expansion portion, the multi-segment structure of the expansion portion will deform and expand outward. Furthermore, as the bolt body with the expansion portion extends into the mounting hole, the bolt body, being a rigid structure, allows the periphery of the expansion portion to scrape against the bottom periphery of the mounting hole. Under the action of the conical surface of the positioning portion, the expansion portion continuously expands towards the scraped bottom periphery until the end of the fastener abuts against the bottom wall of the mounting hole, creating an interference fit between the expansion portion and the mounting hole. At this point, the mounting hole forms a shape similar to a countersunk hole, meaning the inner diameter of the bottom periphery of the mounting hole is larger than the inner diameter of the opening. The expansion portion expands towards the wall of the mounting hole, creating an interference fit. This results in the inner diameter of the expanded portion being larger than the inner diameter of the opening, further forming a barbed structure that firmly fixes the expansion bolt in the mounting hole, preventing it from detaching. This enhances the pull-out strength between the expansion bolt and the inner wall of the mounting hole, improving the stability and connection strength of the structure.

[0008] In a preferred embodiment, the first connecting segment has an external thread, and the nut is connected to the first connecting segment through the external thread, so that it can be connected to an external connector through the nut and the connecting part.

[0009] This application provides a first connecting section with external threads, enabling it to be threadedly connected to a nut. In use, the first connecting section is located outside the mounting hole and is used to connect with external connectors, thereby fastening the external connectors together with the nut via the first connecting section.

[0010] In a preferred embodiment, a protrusion is also connected to the side of the first connecting segment away from the second connecting segment. By tapping the protrusion, the expansion portion of the bolt body can be inserted into the mounting hole.

[0011] This application provides a protrusion at the outer end of the first connecting section, which allows workers to easily tap the protrusion with a hand tool. This design not only protects the bolt body from wear from the tapping but also provides a tapping point so that external forces can be applied more precisely to the bolt body, allowing the bolt body to be accurately connected to the mounting hole.

[0012] In a preferred embodiment, the height of the first connecting segment along the axial direction of the bolt body is less than the height of the third connecting segment along the axial direction of the bolt body.

[0013] The length of the first connecting segment in this application is less than the height of the third connecting segment. The purpose of this is that the third connecting segment is used to set the expansion part, which can extend into the mounting hole to complete the assembly with the mounting hole. The first connecting segment is used to connect with the external connector. Therefore, setting the length of the third connecting segment to be longer than that of the first connecting segment can enhance the connection stability between the first connecting segment and the external connector, thereby improving the connection strength of the entire expansion bolt.

[0014] In a preferred embodiment, the connecting grooves are equally spaced through the periphery of the expansion portion, so that the expansion portion forms multiple expansion segments that can expand outward along the periphery of the bolt body to tighten the connection to the mounting hole.

[0015] The connecting groove of this application separates the expansion part into multiple expansion segments spaced at a predetermined distance along its circumference, allowing each expansion segment to have room for deformation. When the fastener is inserted into the positioning hole in the expansion part, the positioning part of the fastener has a conical structure, which allows the expansion segment to be squeezed outward by the conical structure, forming an expansion state towards the inner wall of the mounting hole. This facilitates the expansion part to be tightly connected to the mounting hole, forming an interference fit with the mounting hole, and improving the pull-out strength and connection stability.

[0016] In a preferred embodiment, the height of the connecting groove along the axial direction of the bolt body is in the range of 2~5mm; the width of the connecting groove is in the range of 0.2~0.5mm.

[0017] The connecting groove of this application cannot be set higher than the third connecting section. The purpose is that the third connecting section does not extend entirely into the mounting hole. In order to enhance the stability of the third connecting section, the expansion part on the third connecting section can also have outward expansion deformation space. Therefore, the connecting groove is preferably 2~5mm in length and 0.2~0.5mm in width.

[0018] In a preferred embodiment, the fastener includes a contact section, a first fixing section, a second fixing section, and a third fixing section; the contact section has a cylindrical structure, and the first fixing section is connected to one end of the contact section; the outer peripheral surface of the first fixing section is a tapered guide slope, forming a positioning part of the fastener; the second fixing section is connected between the first fixing section and the third fixing section, and the second fixing section has a cylindrical structure; the third fixing section has a cylindrical structure, and the radial dimension of the third fixing section is larger than the radial dimension of the second fixing section.

[0019] The fastener includes a contact section, a first fixing section, a second fixing section, and a third fixing section. The contact section is inserted into the bolt body and engages with the positioning hole of the bolt body, preventing the fastener from slipping out after insertion and providing initial positioning. This ensures the fastener matches the bolt body as a set, facilitating storage and use. The first fixing section is inserted into the positioning hole of the expansion portion of the bolt body. The outer circumference of the first fixing section is conical, allowing it to abut against the inner wall of the positioning hole and extend along its axis. This conical surface compresses the inner wall of the positioning hole. The expansion joint expands the positioning hole, causing the expansion portion to expand outward and form an interference fit with the inner wall of the mounting hole, thus enhancing the pull-out strength between the expansion bolt and the mounting hole. The second fixing section connects the first and third fixing sections. The second fixing section has a cylindrical structure, and its outer diameter is the same as the maximum diameter of the tapered first fixing section. The outer diameter of the third fixing section is larger than that of the second fixing section. A stepped shaft structure is formed between the second and third fixing sections. The purpose of the third fixing section is to abut against the end connected to the positioning hole, preventing the entire fastener from being inserted into the positioning hole. The third fixing section limits the position of the entire fastener relative to the positioning hole.

[0020] In a preferred embodiment, the height of the third fixing segment along the axis of the fastener is less than the height of the second fixing segment along the axis of the fastener.

[0021] The purpose of making the height of the third fixing section of this application less than the height of the second fixing section is that the third fixing section is an end face that can be connected to the bottom end of the bolt body, thereby preventing the entire fastener from being inserted into the positioning hole and achieving a limit on the fastener relative to the bolt body in the axial direction.

[0022] In a preferred embodiment, the height of the positioning hole along the axial direction of the bolt body is greater than or equal to the height of the connecting groove along the axial direction of the bolt body.

[0023] The purpose of making the height of the positioning hole less than the height of the connecting groove in this application is twofold: first, to ensure the connection strength of the multiple expansion sections of the expansion part; and second, if the height of the positioning hole is less than the height of the connecting groove, the length of the expansion section formed by the connecting groove will be greater than the height of the positioning hole. This would prevent the part of the expansion section exceeding the height of the positioning hole from expanding towards the inner wall of the mounting hole on the outside, thus preventing the part exceeding the height of the positioning hole from deforming and losing its expansion function. It would also lead to a decrease in the connection strength between the expansion part and the bolt body. Therefore, this application makes the height of the positioning hole greater than or equal to the height of the connecting groove, and not less than the height of the connecting groove.

[0024] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows: 1. This application provides a connecting part for the bolt body to connect with an external connector, thereby fixing the external connector to a specific position using expansion bolts; the expansion part is used to mate with the mounting hole at a fixed position such as a wall or plate, and the expansion part is used for the internal connection of the bolt body. The expansion portion of this application has a positioning hole for inserting a fastener. After the fastener is inserted into the positioning hole, the side of the bolt body connected to the fastener is inserted into the positioning hole. Then, by tapping the end of the bolt body near the connection portion, the expansion portion of the bolt body can extend into the mounting hole. As the bolt body is tapped and extended into the mounting hole, the fastener follows the bolt body into the mounting hole. When the bottom end of the fastener contacts the bottom wall of the mounting hole, the positioning portion of the fastener extends into the positioning hole of the expansion portion of the bolt body. Since the positioning portion of the fastener has a conical structure, and multiple connecting grooves are provided on the periphery of the expansion portion, the expansion portion is divided into a multi-segment structure. The fastener can extend inward along the axial direction of the positioning hole. When the conical positioning portion of the fastener continuously squeezes the expansion portion, the multi-segment structure of the expansion portion will deform and expand outward. Furthermore, as the bolt body with the expansion portion extends into the mounting hole, the bolt body, being a rigid structure, allows the periphery of the expansion portion to scrape against the bottom periphery of the mounting hole. Under the action of the conical surface of the positioning portion, the expansion portion continuously expands towards the scraped bottom periphery until the end of the fastener abuts against the bottom wall of the mounting hole, creating an interference fit between the expansion portion and the mounting hole. At this point, the mounting hole forms a shape similar to a countersunk hole, meaning the inner diameter of the bottom periphery of the mounting hole is larger than the inner diameter of the opening. The expansion portion expands towards the wall of the mounting hole, creating an interference fit. This results in the inner diameter of the expanded portion being larger than the inner diameter of the opening, further forming a barbed structure that firmly fixes the expansion bolt in the mounting hole, preventing it from detaching. This enhances the pull-out strength between the expansion bolt and the inner wall of the mounting hole, improving the stability and connection strength of the structure.

[0025] Moreover, the fasteners in this application are inserted into the positioning holes, eliminating the need for assembly and tightening via threads, thus reducing assembly errors and assembly time, and improving installation efficiency. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of an assembly structure of an expansion bolt according to one embodiment of this application; Figure 2 This is a schematic diagram of the bolt body of an expansion bolt according to one embodiment of this application; Figure 3 This is a structural schematic diagram of the bolt body of an expansion bolt from another angle, according to one embodiment of this application. Figure 4 This is a structural schematic diagram of an expansion bolt fastener according to one embodiment of this application; In the picture, 1. Bolt body; 2. Connecting part; 3. Expansion part; 4. Positioning hole; 5. Communicating groove; 6. Fastener; 7. Positioning part; 8. Nut; 9. First connecting section; 10. Second connecting section; 11. Third connecting section; 12. First fixing section; 13. Second fixing section; 14. Third fixing section; 15. Protrusion; 16. Contact section. Detailed Implementation

[0027] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0028] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0031] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0032] This application relates to an expansion bolt, such as Figure 1-4 As shown, it includes: The bolt body 1 has a connecting part 2 at one end, which is used to connect with an external connector; the bolt body 1 has an expansion part 3 at the other end, a positioning hole 4 is provided in the expansion part 3, and a plurality of communicating grooves 5 connected to the positioning hole 4 are provided on the periphery of the expansion part 3, so that the expansion part 3 can be at least partially inserted into the mounting hole. Fastener 6 has a tapered positioning part 7; the positioning part 7 can be inserted into the positioning hole 4 for installation into the mounting hole. During installation into the mounting hole, the positioning part 7 can move inward along the axis of the positioning hole 4, so that the expansion part 3 expands outward on the periphery and is interference-fitted into the mounting hole.

[0033] The bolt body 1 includes a first connecting section 9, a second connecting section 10, and a third connecting section 11; the first connecting section 9 forms a connecting portion 2 for connection with external connectors; the second connecting section 10 is connected between the first connecting section 9 and the third connecting section 11; the end of the third connecting section 11 away from the first connecting section 9 has an expansion portion 3 of a predetermined length.

[0034] This application provides a connecting part 2 for connecting with an external connector, which is then fixed to a specific position by an expansion bolt; while the expansion part 3 is used to connect with the mounting hole at a fixed position such as a wall or plate, and the expansion part 3 is used for the internal connection of the bolt body 1. The expansion portion 3 of this application has a positioning hole 4, which is used to insert a fastener 6. After the fastener 6 is inserted into the positioning hole 4, the side of the bolt body 1 connected to the fastener 6 is inserted into the positioning hole 4. Then, by tapping the end of the bolt body 1 near the connecting portion 2, the expansion portion 3 of the bolt body 1 can extend into the mounting hole. As the bolt body 1 is tapped and extended into the mounting hole, the fastener 6 follows the bolt body 1 into the mounting hole. When the bottom end of the fastener 6 contacts the bottom wall of the mounting hole, the positioning portion 7 of the fastener 6 will extend into the positioning hole 4 of the expansion portion 3 of the bolt body 1. Since the positioning portion 7 of the fastener 6 has a conical structure, and multiple connecting grooves 5 are provided on the periphery of the expansion portion 3, the expansion portion 3 is divided into a multi-segment structure. The fastener 6 can extend inward along the axial direction of the positioning hole 4. When the conical positioning portion 7 of the fastener 6 continuously squeezes the expansion portion 3, the multi-segment structure of the expansion portion 3 will deform and expand outward. Furthermore, as the bolt body 1 with the expansion portion 3 continuously extends into the mounting hole, the bolt body 1 has a certain rigidity. Therefore, the periphery of the expansion portion 3 can scrape the periphery of the bottom of the mounting hole. Under the action of the conical surface of the positioning portion 7, the expansion portion 3 continuously expands towards the scraped periphery of the bottom of the hole until the end of the fastener abuts against and connects to the bottom wall of the mounting hole, so that the expansion portion 3 and the mounting hole form an interference fit. At this time, the mounting hole forms a shape similar to a countersunk hole, that is, the inner diameter of the bottom periphery of the mounting hole is larger than the inner diameter of the opening of the mounting hole. The expansion portion 3 can expand towards the wall of the mounting hole and form an interference fit with the mounting hole, so that the inner diameter of the expanded portion 3 is larger than the inner diameter of the opening of the mounting hole, further forming a barbed structure, so that the expansion bolt is firmly fixed in the mounting hole, preventing the expansion bolt from coming out of the mounting hole, thereby enhancing the pull-out strength between the expansion bolt and the inner wall of the mounting hole, and improving the stability and connection strength of the structure.

[0035] In a preferred embodiment, the first connecting section 9 has an external thread, and the nut 8 is connected to the first connecting section 9 through the external thread. The nut 8 and the connecting part 2 can be connected to an external connector.

[0036] This application provides a first connecting section 9 with external threads, which can be threadedly connected to a nut 8. The nut is preferably a flange nut. In use, the first connecting section 9 is located outside the mounting hole and is used to connect with an external connector. The external connector is fastened to the first connecting section 9 and the nut 8.

[0037] In a preferred embodiment, a protrusion 15 is also connected to the side of the first connecting segment 9 away from the second connecting segment 10. By tapping the protrusion 15, the expansion portion 3 of the bolt body 1 can be inserted into the mounting hole.

[0038] This application provides a protrusion 15 connected to the outer end of the first connecting section 9, which allows workers to easily use a hand tool to strike the protrusion 15. This design not only protects the bolt body 1 from wear from the strikes, but also provides a striking point so that external forces can be applied to the bolt body 1 more precisely, allowing the bolt body 1 to be accurately connected to the mounting hole.

[0039] In a preferred embodiment, the height of the first connecting segment 9 along the axial direction of the bolt body 1 is less than the height of the third connecting segment 11 along the axial direction of the bolt body 1.

[0040] The length of the first connecting segment 9 in this application is less than the height of the third connecting segment 11. The purpose is that the third connecting segment 11 is used to set the expansion part 3, which can extend into the mounting hole to complete the assembly with the mounting hole. The first connecting segment 9 is used to connect with the external connector. Therefore, setting the length of the third connecting segment 11 to be longer than that of the first connecting segment 9 can enhance the connection stability between the first connecting segment 9 and the external connector, thereby improving the connection strength of the entire expansion bolt.

[0041] In a preferred embodiment, the connecting grooves 5 are equally spaced through the periphery of the expansion portion 3, so that the expansion portion 3 forms multiple expansion sections that can expand outward along the periphery of the bolt body 1 to tighten the connection of the mounting hole.

[0042] The connection groove 5 of this application separates the expansion part 3 into multiple expansion segments spaced at a predetermined distance along its circumference, so that each expansion segment can have space to deform. When the fastener is inserted into the positioning hole 4 in the expansion part 3, the positioning part 7 of the fastener has a conical structure, so that the expansion segment can be squeezed by the conical structure and deformed outward, forming an expansion state towards the inner wall of the mounting hole. This facilitates the expansion part 3 to be tightly connected to the mounting hole to form an interference fit with the mounting hole, thereby improving the pull-out strength and connection stability.

[0043] In a preferred embodiment, the height of the connecting groove 5 along the axial direction of the bolt body 1 ranges from 2 to 5 mm; the width of the connecting groove 5 ranges from 0.2 to 0.5 mm.

[0044] The connecting groove 5 of this application cannot be set higher than the third connecting section 11. The purpose is that the third connecting section 11 does not extend entirely into the mounting hole. In order to enhance the stability of the third connecting section 11, the expansion part 3 on the third connecting section 11 can also have a deformation space for outward expansion. Therefore, the connecting groove 5 is preferably 2~5mm in length and 0.2~0.5mm in width.

[0045] In a preferred embodiment, the fastener includes a contact section 16, a first fixing section 12, a second fixing section 13, and a third fixing section 14; the contact section 16 has a cylindrical structure, and the first fixing section 12 is connected to one end of the contact section 16; the outer peripheral surface of the first fixing section 12 is a tapered guide slope, forming a positioning part 7 of the fastener; the second fixing section 13 is connected between the first fixing section 12 and the third fixing section 14, and the second fixing section 13 has a cylindrical structure; the third fixing section 14 has a cylindrical structure, and the radial dimension of the third fixing section 14 is larger than the radial dimension of the second fixing section 13.

[0046] In this application, the fastener is configured with a four-segment structure, including a contact segment 16, a first fixing segment 12, a second fixing segment 13, and a third fixing segment 14. The contact segment 16 is inserted into the bolt body 1 and engages with the positioning hole 4 of the bolt body 1, preventing the fastener from slipping out of the bolt body 1 after insertion, thus providing a connection and positioning function. This allows the fastener to be matched with the bolt body as a set, facilitating storage and use. The first fixing segment 12 is inserted into the positioning hole 4 of the expansion portion 3 of the bolt body 1. The outer circumferential surface of the first fixing segment 12 is conical, allowing it to abut against the inner wall of the positioning hole 4 and extend into the positioning hole 4 along its axis, thereby enabling the conical surface to compress... The inner wall of the positioning hole 4 expands, causing the expansion part 3 to expand outward and form an interference fit with the inner wall of the mounting hole, thereby enhancing the pull-out strength between the expansion bolt and the mounting hole. The second fixing section 13 connects the first fixing section 12 and the third fixing section 14. The second fixing section 13 has a cylindrical structure, and its outer diameter is the same as the maximum diameter of the tapered first fixing section 12. The outer diameter of the third fixing section 14 is larger than that of the second fixing section 13. A stepped shaft structure is formed between the second fixing section 13 and the third fixing section 14. The purpose of the third fixing section 14 is to abut against the end connected to the positioning hole 4, preventing the entire fastener from being inserted into the positioning hole 4. The third fixing section 14 serves to limit the entire fastener relative to the positioning hole 4.

[0047] In a preferred embodiment, the height of the third fixing segment 14 along the axis of the fastener is less than the height of the second fixing segment 13 along the axis of the fastener.

[0048] The purpose of making the height of the third fixing section 14 of this application less than the height of the second fixing section 13 is that the third fixing section 14 is an end face that can be connected to the bottom end of the bolt body 1, thereby preventing the entire fastener from being inserted into the positioning hole 4 and achieving the limitation of the fastener relative to the bolt body 1 in the axial direction.

[0049] In a preferred embodiment, the height of the positioning hole 4 along the axial direction of the bolt body 1 is greater than or equal to the height of the connecting groove 5 along the axial direction of the bolt body 1.

[0050] The purpose of making the height of the positioning hole 4 less than the height of the connecting groove 5 in this application is twofold: first, to ensure the connection strength of the multiple expansion sections of the expansion part 3; and second, if the height of the positioning hole 4 is less than the height of the connecting groove 5, the length of the expansion section formed by the connecting groove 5 will be greater than the height of the positioning hole 4. This would prevent the part of the expansion section exceeding the height of the positioning hole 4 from expanding towards the inner wall of the mounting hole on the outside, thus preventing the part exceeding the height of the positioning hole 4 from deforming and losing its expansion function. It would also lead to a decrease in the connection strength between the expansion part 3 and the bolt body 1. Therefore, this application makes the height of the positioning hole 4 greater than or equal to the height of the connecting groove 5, and not less than the height of the connecting groove 5.

[0051] When using, such as Figure 1 As shown, in the initial state, a nut 8 is screwed onto the first connecting section 9 of the bolt body 1. The positioning part 7 of the fastener is inserted into the positioning hole 4. Then, the end of the third connecting section 11 of the bolt body 1 is inserted towards the mounting hole. Then, the protrusion on one side of the first connecting section 9 of the bolt body 1 is tapped with a tool, so that the bolt body 1 can be inserted into the mounting hole as a whole. As the bolt body 1 and the fastener move downwards together, until the bottom end of the fastener can contact the bottom wall of the mounting hole, the positioning part 7 of the fastener will also extend into the positioning hole 4. Since the positioning part 7 of the fastener has a conical structure, the expansion part 3 of the bolt body 1 can expand outwards as the positioning part 7 of the fastener extends into the positioning hole 4, that is, the expansion part 3 of the bolt body 1 is expanded. Moreover, due to the expansion... The expansion part 3 can expand outward and scrape the inner wall of the bottom periphery of the mounting hole, causing a small amount of scraping to be removed from the bottom periphery of the mounting hole. This makes the cylindrical mounting hole into a countersunk hole shape, that is, the inner diameter of the bottom of the mounting hole is larger than the inner diameter of the opening of the mounting hole. Under the conical extrusion of the positioning part 7, the expansion part 3 can expand outward and form an interference fit with the mounting hole. The inner diameter of the contact area between the expansion part 3 and the bottom wall of the mounting hole is larger than the inner diameter of the contact area between the third connecting section 11 of the bolt body 1 and the opening of the mounting hole, thus forming a barb-like structure. This makes the expansion part 3 tightly connected to the mounting hole, thereby preventing the expansion bolt from coming off the mounting hole and enhancing the pull-out strength between the expansion part 3 and the mounting hole. The connection strength between the expansion bolt and the mounting hole is increased, making the expansion bolt more stable and safe.

[0052] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0053] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0054] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An expansion bolt, characterized in that, include: The bolt body has a connecting portion at one end for connecting with an external connector; the other end of the bolt body has an expansion portion with a positioning hole inside, and a plurality of communicating grooves connected to the positioning hole are formed on the periphery of the expansion portion, and the expansion portion can be at least partially inserted into the mounting hole. A fastener having a tapered positioning portion; the positioning portion can be inserted into the positioning hole for installation into the mounting hole, and during installation into the mounting hole, the positioning portion can move inward along the axis of the positioning hole, causing the expansion portion to expand outward and be interference-fitted into the mounting hole.

2. An expansion bolt according to claim 1, characterized in that, The bolt body includes a first connecting segment, a second connecting segment, and a third connecting segment; the first connecting segment forms a connecting portion for connection with an external connector; the second connecting segment is connected between the first connecting segment and the third connecting segment; the end of the third connecting segment away from the first connecting segment has an expansion portion of a predetermined length.

3. An expansion bolt according to claim 2, characterized in that, The first connecting segment has external threads, and the nut is connected to the first connecting segment through the external threads. The nut and the connecting part can be connected to an external connecting component.

4. An expansion bolt according to claim 2, characterized in that, The side of the first connecting segment away from the second connecting segment is also connected to a protrusion, which can be used to push the expansion portion of the bolt body into the mounting hole by tapping the protrusion.

5. An expansion bolt according to claim 2, characterized in that, The height of the first connecting segment along the axial direction of the bolt body is less than the height of the third connecting segment along the axial direction of the bolt body.

6. An expansion bolt according to claim 1, characterized in that, The connecting grooves are equally spaced through the periphery of the expansion portion, so that the expansion portion forms multiple expansion sections that can expand outward along the periphery of the bolt body to tighten the connection to the mounting hole.

7. An expansion bolt according to claim 6, characterized in that, The height of the connecting groove along the axial direction of the bolt body ranges from 2 to 5 mm; the width of the connecting groove ranges from 0.2 to 0.5 mm.

8. An expansion bolt according to claim 1, characterized in that, The fastener includes a contact section, a first fixing section, a second fixing section, and a third fixing section; the contact section has a cylindrical structure, and the first fixing section is connected to one end of the contact section; the outer peripheral surface of the first fixing section has a tapered guide slope, forming the positioning part of the fastener; the second fixing section is connected between the first fixing section and the third fixing section, and the second fixing section has a cylindrical structure; the third fixing section has a cylindrical structure, and the radial dimension of the third fixing section is larger than the radial dimension of the second fixing section.

9. An expansion bolt according to claim 8, characterized in that, The height of the third fixing segment along the axis of the fastener is less than the height of the second fixing segment along the axis of the fastener.

10. An expansion bolt according to claim 1, characterized in that, The height of the positioning hole along the axial direction of the bolt body is greater than or equal to the height of the connecting groove along the axial direction of the bolt body.

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