Combined fastening structure

Abstract

The utility model discloses a combined fastening structure which comprises a stud, a sleeve and a nut, one end of the stud is sequentially provided with a guide block, an expansion block and a drill bit, the other end of the stud is provided with a positioning block, the circumferential surface of the stud is provided with a filling groove, and the guide block is in a circular truncated cone shape; the sleeve comprises a first fastening assembly, a sleeve body, a second fastening assembly and a positioning ring which are sequentially connected from the drill bit to the positioning block, the first fastening assembly comprises a plurality of first fastening arms arranged at intervals, the second fastening assembly comprises a plurality of second fastening arms arranged at intervals, and the middles of the second fastening arms are bent close to the stud; the second fastening arm is used for being bent and filled in the filling groove. According to the combined type fastening structure, fastening installation operation is easy, convenient and fast, good anti-impact and anti-vibration performance is achieved, the second fastening arm is bent inwards and filled into the filling groove, therefore, the position between the sleeve and the stud is fixed, and the combined type fastening structure is high in stability and safety.

Description

Technical Field

[0001] The utility model relates to the field of fastening components, in particular to a combined fastening structure. Background Art

[0002] A fastening structure is a general term for a class of mechanical parts used to fasten two or more parts or components to be fastened and connected into a whole. The fastening structure is also called a fastener and is a kind of mechanical basic part with wide application.

[0003] In the related art, the fastening structure includes various types. The combination of bolts and nuts is one of them. Under specific working conditions, such as in soft materials, fragile materials or occasions where high fastening force is required, the fixing effect of the existing fastening structure of bolt and nut combination is not ideal, and there are problems such as insecure fixing and easy loosening. Moreover, the installation often requires specific tools for operations such as opening holes, and the installation operation steps are cumbersome and complex, and the installation efficiency is low. Summary of the Utility Model

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. For this reason, the utility model provides a combined fastening structure with stable and reliable fastening effect, good safety performance, and simple, fast and convenient installation and fastening operation.

[0005] A combined fastening structure according to an embodiment of the utility model includes a stud, a sleeve and a nut. One end of the stud is successively provided with a guide block, an expansion block and a drill bit. The other end of the stud is provided with a positioning block. The circumferential surface of the stud is provided with a filling groove. The distance between one end of the stud close to the positioning block and the filling groove is L. The drilling diameter of the drill bit is equal to the diameter of the expansion block. The diameter of the expansion block is greater than the diameter of the stud. The guide block is frustum-shaped. The upper bottom of the guide block is connected to the stud, and the lower bottom of the guide block is connected to the expansion block. The sleeve is sleeved outside the stud. The length of the sleeve is equal to the length of the stud. The outer diameter of the sleeve is smaller than the diameter of the expansion block. The nut is threadedly connected outside the stud. The nut is located outside one end of the sleeve away from the drill bit.

[0006] The sleeve includes a first fastening component, a barrel body, a second fastening component and a positioning ring connected in sequence from the drill bit towards the positioning block. The first fastening component includes a plurality of first fastening arms arranged at intervals. The length of the first fastening arm is H. The second fastening component includes a plurality of second fastening arms arranged at intervals. The middle part of the second fastening arm is bent close to the stud. The distance between one end of the positioning ring away from the barrel body and the second fastening arm is h1. L = H = h1. The second fastening arm is used to be bent and filled in the filling groove.

[0007] In this embodiment, the width of the second fastening arm is d, and the distance between every two adjacent second fastening arms is D, and d < D.

[0008] In this embodiment, a relief inclined surface is provided at one end of the first fastening arm away from the cylinder body. The relief inclined surface is provided on the side of the first fastening arm away from the stud, and the relief inclined surface inclines towards the stud along the direction from the positioning block to the drill bit.

[0009] In this embodiment, a positioning groove is provided on the side of the nut close to the sleeve, and the positioning ring is arranged in the positioning groove.

[0010] In this embodiment, a plurality of cutting blades are provided on the surface of the drill bit, and a recessed groove is formed between every two adjacent cutting blades.

[0011] In this embodiment, a plurality of waste discharge grooves are provided on the circumferential surface of the expansion block. One end of the waste discharge groove is connected to the recessed groove, and the other end of the waste discharge groove penetrates through the side surface of the guide block.

[0012] In this embodiment, the height of the guide block is less than the length of the first fastening arm.

[0013] In this embodiment, the positioning block is prism-shaped.

[0014] The embodiment of the present utility model has at least the following beneficial effects:

[0015] By providing a drill bit at the end of the stud, the target body can be directly drilled, eliminating the need for additional drilling tools. The fastening and installation operation is simple and fast, with high installation efficiency. After drilling, the nut is twisted to rotate relative to the stud to push the sleeve forward close to the guide block. The second fastening arm is driven by the guide block to expand and deform outward. The second fastening arm after outward expansion and inflation can tightly press against the hole wall of the positioning hole of the target body, achieving the effect of tight positioning. And through the expansion block, the contact area between the second fastening arm and the hole wall can be effectively increased, thereby further improving the firmness of tight positioning. It can not only effectively improve the load-bearing capacity of this combined fastening structure, but also has good anti-impact and anti-vibration performance, with a wide range of applications. In addition, by setting the positional relationship among the stud, the first fastening arm, the filling groove, and the second fastening arm, the deformation of the second fastening arm can occur after the first fastening arm is fully expanded and deformed outward. After the first fastening arm completes outward expansion and fastening, the second fastening arm bends inward and fills into the filling groove, thereby fixing the position between the sleeve and the stud, effectively ensuring the reliability of the fastening structure formed by the second fastening arm against the hole wall. This combined fastening structure has strong stability and high safety. Through the positioning ring, the torsional force of the nut can be effectively prevented from directly acting on the second fastening arm, effectively ensuring the deformation timing and deformation position of the second fastening arm, and improving the reliability of the fastening connection action. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, where:

[0017] Figure 1 Schematic three-dimensional structure diagram of the combined fastening structure according to an embodiment of the present utility model;

[0018] Figure 2 Exploded structure diagram of the combined fastening structure according to an embodiment of the present utility model;

[0019] Figure 3 Front view structure diagram of the combined fastening structure according to an embodiment of the present utility model;

[0020] Figure 4 Internal structure diagram of the combined fastening structure before fastening according to an embodiment of the present utility model;

[0021] Figure 5 Internal structure diagram of the combined fastening structure after fastening according to an embodiment of the present utility model.

[0022] Reference numerals:

[0023] Stud 100, filling groove 101, guiding block 110, expansion block 120, waste discharge groove 121, drill bit 130, cutting blade 131, recessed groove 132, positioning block 140;

[0024] Socket 200, barrel body 210, positioning ring 220, first fastening arm 230, relief inclined plane 231, second fastening arm 240;

[0025] Nut 300, positioning groove 310. Detailed implementation manners

[0026] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, left, right, front, back, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0028] In the description of the present utility model, if the terms first and second are used for the purpose of distinguishing technical features only, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0029] In the description of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense. Those skilled in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solution.

[0030] A fastening structure is a general term for a class of mechanical parts used to fasten two or more parts or components to be firmly connected into a whole. The fastening structure is also called a fastener and is a widely used basic mechanical part. In the related art, the fastening structure includes various types, and the combination of bolts and nuts is one of them. Under specific working conditions, such as in soft materials, fragile materials, or occasions where high fastening forces are required, the fixing effect of the existing fastening structure of bolt-nut combination is not ideal, and there are problems such as insecure fixing and easy loosening. Moreover, installation often requires specific tools for operations such as hole opening, and the installation operation steps are cumbersome and complex, resulting in low installation efficiency.

[0031] Especially when pre-drilling, factors such as the matching degree between the drilling diameter and the bolt diameter and the stability of the hole wall after drilling will directly affect the fastening effect, and the selection of tools and the processing operation of drilling are cumbersome. In addition, the traditional fastening structure is prone to loosening when subjected to vibration or impact, affecting the stability and safety of the overall structure. In response to the above problems, some improved fastening structures have emerged on the market, such as expansion screws, etc. However, these structures often have problems such as complex structures, inconvenient installation, and high costs, and their applications are limited in some special environments such as narrow spaces and high-temperature and high-pressure environments. Therefore, it is particularly important to develop a combined fastening structure with a simple structure, convenient installation, good fastening effect, and wide application range.

[0032] The following refers to the attached Figure 1 to the attached Figure 5 to describe the combined fastening structure of the embodiments of the present utility model, with stable and reliable fastening effect, good safety performance, and simple, fast and convenient installation and fastening operation.

[0033] Refer to Figures 1 to 5, A combined fastening structure according to an embodiment of the present utility model includes a stud 100, a sleeve 200 and a nut 300. One end of the stud 100 is sequentially provided with a guide block 110, an expansion block 120 and a drill bit 130. The other end of the stud 100 is provided with a positioning block 140. The positioning block 140 is used to connect an external electric screwdriver or other devices for driving rotation. The stud 100 is a cylindrical structure with external threads. The expansion block 120 is a flat cylindrical structure. A filling groove 101 is circumferentially provided on the circumferential surface of the stud 100. The filling groove 101 is circularly arranged around the circumferential surface of the stud 100. The distance between one end of the stud 100 close to the positioning block 140 and the filling groove 101 is L. Specifically, the distance between the center of the filling groove 101 and one end of the stud 100 close to the positioning block 140 is L. The drilling diameter of the drill bit 130 is equal to the diameter of the expansion block 120. The diameter of the expansion block 120 is greater than the diameter of the stud 100. The guide block 110 is frustum-shaped. The upper base of the guide block 110 is connected to the stud 100, and the lower base of the guide block 110 is connected to the expansion block 120. The guide block 110 forms a guiding effect with a gradually increasing diameter from the stud 100 towards the expansion block 120. The diameter of one end of the drill bit 130 close to the expansion block 120 is D1, the diameter of the expansion block 120 is D2, the diameter of one end of the guide block 110 close to the expansion block 120 is D3, the diameter of the guide block 110 close to the stud 100 is D4, and the diameter of the stud 100 is D5. D1 = D2 = D3 > D4 = D5. The sleeve 200 is sleeved outside the stud 100. The sleeve 200 is a cylindrical sleeve 200. The nut 300 is threadedly connected outside the stud 100. The nut 300 is located outside one end of the sleeve 200 away from the drill bit 130. Before fastening, the length of the sleeve 200 is equal to the length of the stud 100. The outer diameter of the sleeve 200 is smaller than the diameter of the expansion block 120;

[0034] The sleeve 200 includes a first fastening assembly, a cylinder body 210, a second fastening assembly, and a positioning ring 220 that are sequentially connected from the drill bit 130 towards the positioning block 140. The first fastening assembly includes a plurality of first fastening arms 230 that are spaced apart. The distance between two adjacent first fastening arms 230 is equal, that is, a plurality of equally spaced first fastening arms 230 are provided at one end of the cylinder body 210 close to the drill bit 130. One end of each first fastening arm 230 is connected to one end of the sleeve 200 close to the drill bit 130. The length of the first fastening arm 230 is H. The second fastening assembly includes a plurality of second fastening arms 240 that are spaced apart. The distance between two adjacent second fastening arms 240 is equal. One end of each second fastening arm 240 is connected to the end of the cylinder body 210 far from the drill bit 130, and the other end of each second fastening arm 240 is connected to the positioning ring 220, which can effectively prevent the torsional force during the rotation of the nut 300 from directly acting on the second fastening arm 240 and causing unnecessary torsion of the second fastening arm 240, thereby effectively improving the reliability of the extrusion deformation action of the second fastening arm 240. The middle part of the second fastening arm 240 bends towards the side close to the axis of the stud 100, so as to form a preset base that bends inward for the second fastening arm 240. The distance between the end of the positioning ring 220 far from the cylinder body 210 and the second fastening arm 240 is h1, specifically, the distance between the end of the positioning ring 220 far from the cylinder body 210 and the center of the second fastening arm 240 is h1. L = H = h1. The second fastening arm 240 is used to be bent inward and filled in the filling groove 101. During the continuous advancement of the nut 300, after the first fastening arm 230 reaches around the expansion block 120 under the guiding action of the guiding block 110 and the first fastening arm 230 is completely expanded and deformed to surround the expansion block 120, the second fastening arm 240 is just opposite to the filling groove 101, and the second fastening arm 240 is extruded and deformed and filled into the filling groove 101 to achieve the final tight positioning.

[0035] The working process of this combined fastening structure is as follows: The structure before fastening, refer to Figures 1 to 4As shown in the figure, the positioning block 140 is connected by an external electric screwdriver or other structures, and the stud 100 is driven to rotate by the positioning block 140. The drill bit 130 rotates following the stud 100 to drill a hole in the target body. After a positioning hole is drilled in the target body, the position of the stud 100 is fixed by the positioning block 140, and a tool is used to twist the nut 300 so that the nut 300 advances along the stud 100 towards the drill bit 130. Under the pushing action of the nut 300, the sleeve 200 moves along the guide block 110 towards the expansion block 120. Under the guiding action of the guide block 110, the first fastening arm 230 gradually expands outwards and reaches the side of the expansion block 120. Under the positioning action of the expansion block 120, the first fastening arm 230 expands outwards and abuts against and presses on the inner wall of the positioning hole to form a firm positioning effect. After the first fastening assembly completely reaches the periphery of the expansion block 120 to complete the fastening action, the second fastening arm 240 reaches one side of the filling groove 101. Under the continuous advancing and pushing action of the nut 300, the second fastening arm 240 with an inward bending and extruding shape is bent inwards and deformed under the yielding action of the filling groove 101, and the second fastening arm 240 is bent and filled into the filling groove 101 to lock the position between the sleeve 200 and the stud 100. Even if the nut 300 loosens, the stability of the fastening structure formed by the expansion block 120 cooperating with the first fastening arm 230 can be effectively maintained. The firm positioning effect of this combined fastening structure is reliable, and the structure after fastening is shown in Figure 5 as shown in the figure.

[0036] By providing the drill bit 130 at the end of the stud 100, the target body can be directly drilled, eliminating the need to use an additional drilling tool. The fastening and installation operation is simple and fast, with high installation efficiency and strong functionality. After drilling is completed, the nut 300 is rotated relative to the stud 100 to push the sleeve 200 to advance towards the guide block 110. The guide block 110 drives the second fastening arm 240 to expand and deform. The second fastening arm 240 after expanding and swelling can be firmly pressed against the wall of the positioning hole of the target body, achieving a firm positioning effect. And through the expansion block 120, the contact area between the second fastening arm 240 and the hole wall can be effectively increased, thereby further improving the firmness of the firm positioning. It can not only effectively improve the load-bearing capacity of this combined fastening structure, but also has good anti-impact and anti-vibration performance, with a wide range of applications, and can be applied to the fastening of soft or brittle materials;

[0037] In addition, by setting the positional relationship among the stud 100, the first fastening arm 230, the filling groove 101, and the second fastening arm 240, such that the second fastening arm 240 is restricted in position by other parts of the stud 100 before reaching the filling groove 101, it can be ensured that the deformation of the second fastening arm 240 occurs after the first fastening arm 230 is fully expanded and deformed. After the first fastening arm 230 completes the outward expansion and fastening, under the limiting effect between the expansion block 120 and the cylinder body 210, the second fastening arm 240 with an inward bending basis bends inward and fills into the filling groove 101, thereby fixing the position between the sleeve 200 and the stud 100, effectively ensuring the reliability of the fastening structure formed by the second fastening arm 240 against the hole wall. The position of the sleeve 200 relative to the stud 100 is not affected by the loosening of the nut 300. The stability of this combined fastening structure is strong and the safety is high. Through the positioning ring 220, not only can the positional relationship between the second fastening arm 240 and structures such as the filling groove 101 be ensured, but also the torsional force of the nut 300 can be effectively prevented from directly acting on the second fastening arm 240, effectively ensuring the deformation timing and deformation position of the second fastening arm 240, and effectively improving the reliability of the fastening connection operation.

[0038] To ensure that the second fastening arm 240 can be effectively bent and filled into the filling groove 101, the width of the second fastening arm 240 is d, and the distance between every two adjacent second fastening arms 240 is D, where d < D. By narrowing the width of the second fastening arm 240, the bendable deformation ability of the second fastening arm 240 can be effectively improved, thereby effectively improving the reliability of the bending deformation action when the second fastening arm 240 fills into the filling groove 101.

[0039] Preferably, to simplify the processing and preparation steps of the combined fastening structure of the embodiment of the present utility model, the stud 100 has a threaded section and a smooth section. The side of the filling groove 101 close to the positioning block 140 is the threaded section of the stud 100, and the side of the filling groove 101 far from the positioning block 140 is the smooth section of the stud 100. It can effectively reduce the threading operation, and only the part of the filling groove 101 close to the positioning block 140 needs to be cut, which can effectively improve the processing efficiency and simplify the processing and preparation steps.

[0040] It can be understood that a relief inclined surface 231 is provided at one end of each first fastening arm 230 away from the cylinder body 210. The relief inclined surface 231 is provided on the side of the first fastening arm 230 away from the stud 100, and the relief inclined surface 231 is inclined close to the stud 100 along the direction from the positioning block 140 to the drill bit 130, that is, the end of the first fastening arm 230 away from the cylinder body 210 is thinned.

[0041] When the first fastening arm 230 reaches the side of the expansion block 120 under the action of the guide block 110, the angle between the starting area of ​​the outer side surface of the first fastening arm 230 and the wall of the positioning hole of the target body can be reduced by giving way to the inclined surface 231, which can effectively reduce the resistance force received by the first fastening arm 230 when it just expands outward, effectively improve the smoothness of the outward expansion action of the first fastening arm 230, and effectively improve the stability of the overall fastening installation action.

[0042] It can be understood that a positioning groove 310 is provided on the side of the nut 300 close to the sleeve 200, and the positioning ring 220 is arranged in the positioning groove 310. The positioning groove 310 is used to limit the positioning ring 220, which can further improve the reliability of the corresponding structure in the sleeve 200 when bending and tightening.

[0043] It is understandable that a plurality of cutting blades 131 are disposed on the surface of the drill bit 130 , and a recessed groove 132 is formed between each two adjacent cutting blades 131 . The recessed groove 132 is used to discharge waste materials formed by cutting toward the positioning block 140 .

[0044] It can be understood that the circumferential surface of the expansion block 120 is provided with a plurality of waste discharge grooves 121, the number of the waste discharge grooves 121 is equal to the number of the recessed grooves 132, one end of each row of waste grooves 121 is connected to the end of each recessed groove 132, and the other end of the waste discharge groove 121 passes through the side surface of the guide block 110 used for guiding. The waste discharge groove 121 cooperates with the recessed groove 132 to effectively improve the efficiency of drilling waste discharge, and can effectively reduce the waste remaining in the positioning hole of the target body during drilling, thereby effectively improving the reliability of the fastening connection.

[0045] It is understandable that the height of the guide block 110 is less than the length of the first fastening arm 230, which can ensure that the first fastening arm 230 can effectively surround the side of the expansion block 120, and can effectively ensure the fastening and positioning effect. Specifically, the length of the first fastening arm 230 is equal to the sum of the height of the guide block 110 and the height of the expansion block 120, which can effectively improve the space utilization of the overall combined fastening structure.

[0046] To facilitate transportation and storage, a threaded block can be further provided between the stud 100 and the positioning block 140. The threads on the surface of the threaded block are connected to the threads on the surface of the stud 100. The threaded block is used to connect the nut 300. During storage and transportation, the position of the nut 300 can be effectively fixed, and the nut 300 can be prevented from falling off, making storage and transportation convenient.

[0047] It is understandable that the positioning block 140 is prism-shaped, and can be specifically set to a polygonal prism such as a hexagonal prism or a quadrilateral prism, which can facilitate the locking connection between tools such as an electric screwdriver and the positioning block 140 and effectively ensure the drilling effect of the drill bit 130.

[0048] Specifically, the nut 300 is a hexagonal nut 300, which can adapt to the adjustment of most wrench tools and is convenient for installation and operation.

[0049] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A combined fastening structure, characterized in that: The invention comprises a stud (100), a sleeve (200) and a nut (300), wherein one end of the stud (100) is provided with a guide block (110), an expansion block (120) and a drill bit (130) in sequence, and the other end of the stud (100) is provided with a positioning block (140). A filling groove (101) is provided on the circumferential surface of the stud (100), and the distance between one end of the stud (100) close to the positioning block (140) and the filling groove (101) is L. The drilling diameter of the drill bit (130) is equal to the diameter of the expansion block (120), and the diameter of the expansion block (120) is larger than the diameter of the stud (100). ), the guide block (110) is in a truncated cone shape, the upper base of the guide block (110) is connected to the stud (100), the lower base of the guide block (110) is connected to the expansion block (120), the sleeve (200) is sleeved outside the stud (100), the length of the sleeve (200) is equal to the length of the stud (100), the outer diameter of the sleeve (200) is smaller than the diameter of the expansion block (120), the nut (300) is threadedly connected to the outside of the stud (100), and the nut (300) is located outside one end of the sleeve (200) away from the drill bit (130); The sleeve (200) comprises a first fastening assembly, a barrel body (210), a second fastening assembly and a positioning ring (220) which are connected in sequence from the drill bit (130) toward the positioning block (140), the first fastening assembly comprises a plurality of first fastening arms (230) arranged at intervals, the length of the first fastening arms (230) being H, the second fastening assembly comprises a plurality of second fastening arms (240) arranged at intervals, the middle portion of the second fastening arms (240) being bent close to the stud (100), the distance between one end of the positioning ring (220) away from the barrel body (210) and the second fastening arm (240) being h1, L=H=h1, and the second fastening arm (240) being used for bending and filling in the filling groove (101).

2. A combined fastening structure according to claim 1, characterized in that: The width of the second fastening arms (240) is d, and the distance between any two adjacent second fastening arms (240) is D, d <D。 3. A combined fastening structure according to claim 1, characterized in that: An end of the first fastening arm (230) away from the barrel body (210) is provided with a paving inclined surface (231), and the paving inclined surface (231) is provided on a side of the first fastening arm (230) away from the stud (100), and the paving inclined surface (231) is inclined close to the stud (100) along the direction from the positioning block (140) to the drill bit (130).

4. A combined fastening structure according to claim 1, characterized in that: A positioning groove (310) is provided on one side of the nut (300) close to the sleeve (200), and the positioning ring (220) is arranged in the positioning groove (310).

5. The combined fastening structure according to claim 1, characterized in that: A plurality of cutting blades (131) are provided on the surface of the drill bit (130), and a recessed groove (132) is formed between each two adjacent cutting blades (131).

6. A combined fastening structure according to claim 5, characterized in that: A plurality of waste discharge grooves (121) are provided on the circumferential surface of the expansion block (120), one end of the waste discharge groove (121) is connected to the recessed groove (132), and the other end of the waste discharge groove (121) passes through the side surface of the guide block (110).

7. A combined fastening structure according to claim 1, characterized in that: The height of the guide block (110) is smaller than the length of the first fastening arm (230).

8. The combined fastening structure according to claim 1, characterized in that: The positioning block (140) is in the shape of a prism.

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