Anti-falling self-tapping anchor bolt

Abstract

The utility model discloses an anti-falling self-tapping anchor bolt, and relates to the technical field of anchor bolts. The device comprises a self-tapping stud, a fixing assembly is arranged on the upper end face of the self-tapping stud, an extrusion assembly is arranged on the lower end face of the self-tapping stud, a limiting sleeve is arranged below the self-tapping stud, and the lower end of the extrusion assembly is movably matched in the limiting sleeve; a fixing column is arranged on the lower end face of the inner wall of the limiting sleeve, an extrusion plate is elastically matched above the fixing column, a conical ring is arranged on the lower end face of the extrusion plate and arranged on the peripheral side of the upper end of the fixing column in a sleeving mode, a plurality of moving blocks elastically slide in the limiting sleeve, trapezoidal blocks are arranged on the sides, close to the fixing column, of the moving blocks, and the other sides of the moving blocks penetrate out of the limiting sleeve. The tapping process of the self-tapping stud and the anti-falling process that the movable block is pushed by the extrusion assembly to be tightly attached to the groove wall are integrated into the same rotation operation, hole thread tapping and anchor bolt anti-falling fixing can be completed continuously and conveniently when the fixing assembly is rotated at a time, tedious operation steps are reduced, and installation efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of anchor bolts, specifically, it relates to an anti-loosening self-tapping anchor bolt. Background Technology

[0002] Anchor bolts are a general term for all anchoring components, covering a wide range. They can be classified into metal anchor bolts and non-metal anchor bolts according to different raw materials, and into expansion anchor bolts, hole-expanding anchor bolts, bonded anchor bolts, concrete screws, shot nails, concrete nails, etc. according to different anchoring mechanisms.

[0003] Chinese Patent No. CN219755032U discloses an anti-loosening self-tapping anchor bolt, comprising: the fixing component including a fixing sleeve disposed on the top of the self-tapping shell, the fixing sleeve being threadedly connected to the connecting stud, a hexagonal rotating plate being fixedly disposed on the surface of the fixing sleeve; the connecting component including a rotating plate disposed on the top of the connecting stud, the rotating plate having a rotating groove on its top, a connecting post being fixedly disposed on the surface of the rotating plate; and the number of anti-loosening limiting plates being four or a multiple of four.

[0004] The anti-loosening self-tapping anchor disclosed in the application requires the following steps: first, the self-tapping housing is rotated into a pre-drilled hole by rotating the hexagonal rotating plate; then, the rotating plate and connecting stud are rotated by rotating the groove, causing the anti-loosening limiting plate to be squeezed against the hole wall. This process requires two operations to complete the tapping and anti-loosening, making the operation quite cumbersome. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an anti-loosening self-tapping anchor bolt, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] A self-tapping anchor bolt with anti-loosening features: a self-tapping stud, a fixing component on the upper end face of the self-tapping stud and a pressing component on the lower end face, a limiting sleeve provided below the self-tapping stud, and the lower end of the pressing component being movably fitted within the limiting sleeve;

[0008] The lower end face of the inner wall of the limiting sleeve is provided with a fixed post, and an extrusion plate is elastically fitted above the fixed post. The extrusion plate is located on the lower end face of the extrusion assembly. A conical ring is installed on the lower end face of the extrusion plate. The conical ring is sleeved on the upper circumference of the fixed post. The vertical section of the conical ring is two right-angled triangles with the hypotenuse facing downward and symmetrically arranged. Multiple moving blocks slide elastically inside the limiting sleeve. The multiple moving blocks are evenly distributed around the fixed post. The minimum number of moving blocks is four. A trapezoidal block is installed on the side of the moving block closest to the fixed post, and the other side extends to the outside of the limiting sleeve. The vertical section of the trapezoidal block is a right-angled trapezoidal structure.

[0009] Optionally, an anti-slip plate is installed on the side of the moving block away from the trapezoidal block, and multiple anti-slip strips are installed on the side of the anti-slip plate.

[0010] Optionally, the side of the limiting sleeve is provided with a sliding groove that is adapted to the moving block. The sliding groove is connected to the inner cavity of the limiting sleeve. The moving block is slidably fitted in the corresponding sliding groove. A first storage groove is provided on the lower side of the sliding groove. A limiting plate is installed on the lower side of the moving block. The limiting plate is slidably fitted in the first storage groove. A first spring is installed between the limiting plate and one side of the first storage groove.

[0011] Optionally, the lower end face of the extrusion plate is provided with a second storage groove, the upper end face of the second storage groove and the upper end face of the fixing column are both provided with a second limiting groove, and a second spring is installed between the end faces of the upper and lower second limiting grooves.

[0012] Optionally, the fixing component includes a first protrusion on the upper end face of the self-tapping stud, and the upper end face of the first protrusion is provided with a hexagonal hole.

[0013] Optionally, the extrusion assembly includes a connecting post located on the lower end face of the self-tapping stud, a through groove on the upper end face of the limiting sleeve that communicates with the inner cavity of the limiting sleeve, a vertical through groove at the lower end of the connecting post, and a push post on the lower end face of the connecting post that is movably fitted within the limiting sleeve.

[0014] Optionally, the upper end face of the extrusion plate is provided with a second protrusion, and the lower end face of the pusher is provided with a rotating groove corresponding to the second protrusion. The pusher is sleeved around the second protrusion through the rotating groove.

[0015] Optionally, a bearing is installed on the periphery of the second protrusion, and the bearing is installed on the periphery of the rotating groove.

[0016] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0017] By integrating the self-tapping stud tapping process and the anti-loosening process of pushing the moving block tightly against the groove wall using the extrusion component into the same rotation operation, it is convenient to complete the hole thread tapping and anchor bolt anti-loosening fixation in one rotation of the fixing component, reducing cumbersome operation steps and improving installation efficiency. Through the cooperation of the extrusion component and the extrusion plate, the extrusion of multiple trapezoidal blocks by the conical ring is automatically triggered as the tapping depth increases, so that multiple moving blocks slowly and synchronously approach the groove wall, improving the continuity of tapping and anti-loosening. Through the extrusion of the moving block against the groove wall and the cooperation of the self-tapping stud thread with the hole thread, the firmness of the anchor bolt in the hole is improved.

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0020] In the picture:

[0021] Figure 1 This is a schematic diagram of the three-dimensional structure of the anchor bolt;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the anchor bolt;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the limiting sleeve.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] First protruding post 1, self-tapping stud 2, connecting post 3, limiting sleeve 4, push post 5, extrusion plate 6, conical ring 7, anti-slip plate 8, anti-slip strip 9, moving block 10, sliding groove 11, first spring 12, through groove 13, trapezoidal block 14, fixing post 15, limiting plate 16, first storage groove 17, second limiting groove 18, second storage groove 19, second spring 20, second protruding post 21.

[0026] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] In the fields of construction and mechanical engineering, anchors, as a fundamental connecting component, function to bear external loads by forming a reliable anchoring force within the substrate. Anti-loosening self-tapping anchors, as an important type of anchoring technology, are mainly used to achieve stable connections in lightweight porous materials (such as concrete, aerated concrete blocks, and gypsum board) or thin-walled metal structures. Their core design concept combines the convenience of self-tapping threads with the reliability of an anti-loosening structure, solving the problem of traditional anchors easily loosening under vibration, impact, or long-term loads.

[0030] From a structural classification perspective, anti-loosening self-tapping anchors are typically a derivative of mechanical expansion anchors. However, unlike traditional expansion bolts that rely on external hammering or tightening for expansion, they directly cut into the substrate during screwing to form an anchoring hole. Simultaneously, special structures on the anchor body (such as a tapered tail, expansion plate, or locking ring) generate radial pressure against the substrate. The head design of these anchors often employs hexagonal, round, or countersunk head styles to adapt to the embedding requirements of different installation scenarios. Some high-end models integrate a sealing gasket at the head to prevent moisture penetration into the substrate. It is worth noting that the anti-loosening function is implemented in diverse ways: one type uses a bidirectional thread structure to increase frictional resistance, forming the main anchoring force during forward screwing, while the reverse thread generates a self-locking effect through a slight angle difference; another type adds an elastic metal ring or deformable plastic sleeve to the anchor tail, which expands under pressure to form a physical lock when the anchor is fully screwed in; in addition, some products enhance anti-slip performance by coating the thread surface with a high-friction coefficient material (such as nylon coating or rubber microparticles).

[0031] In terms of application scenarios, these anchors offer significant advantages in assembly efficiency due to their pre-drilling-free characteristic, making them particularly suitable for situations where on-site construction conditions are limited. For example, in interior decoration, when used to fix the connection nodes between the ceiling joists and lightweight partition walls, construction workers can directly use power tools to screw the anchors into the plasterboard or light steel joists without prior drilling. In outdoor projects, the anti-loosening design effectively copes with cyclic loads caused by wind vibration, commonly seen in solar panel mounting and billboard fixing. Furthermore, in the vehicle manufacturing field, some improved anti-loosening self-tapping anchors are used to connect body panels and frames, their seismic performance reducing the risk of connection failure due to metal fatigue during driving. It is worth noting that with the widespread application of composite materials, the thread geometry parameters of these anchors are continuously being optimized to adapt to the mechanical properties of new substrates such as carbon fiber reinforced plastics (CFRP), avoiding substrate delamination or breakage during the insertion process.

[0032] In terms of material selection, anti-loosening self-tapping anchors are mostly made of medium carbon alloy steel that has undergone quenching and tempering, and the surface is coated with Dacromet or hot-dip galvanized to improve corrosion resistance. For applications with fire protection requirements (such as fixing fireproof cladding systems in steel structures), stainless steel may be used in conjunction with ceramic fiber reinforced expansion components. Recent technological advancements have also seen innovative attempts to apply shape memory alloys (SMAs) to anti-loosening structures. These materials can actively adjust expansion pressure when temperatures change, thereby maintaining the stability of anchoring performance in high-temperature environments. However, such high-end designs are currently limited by cost factors and are mainly used in special fields such as aerospace.

[0033] From a manufacturing process perspective, the production of anti-loosening self-tapping anchors involves precision cold heading and thread rolling technologies. The assembly accuracy of the anti-loosening components directly affects product performance. For example, models with a split expansion sleeve require precise machining of annular grooves on the anchor bolt body, and automated equipment is used to press the sleeve into the predetermined position, ensuring uniform expansion without deflection during installation. Quality inspection typically includes axial tensile testing, torque testing, and salt spray testing, meeting international standards such as ISO 898-1 for mechanical properties and ASTM B117 for corrosion resistance evaluation. Some manufacturers also conduct vibration table tests simulating actual working conditions to quantify the displacement attenuation rate of the anti-loosening structure at specific frequencies and amplitudes.

[0034] Please see Figure 1-3 As shown, this embodiment provides a self-tapping anchor bolt that is designed to prevent detachment, including: a self-tapping stud 2, a fixing component on the upper end face of the self-tapping stud 2, a pressing component on the lower end face, a limiting sleeve 4 below the self-tapping stud 2, and the lower end of the pressing component being movably fitted within the limiting sleeve 4;

[0035] The lower end face of the inner wall of the limiting sleeve 4 is provided with a fixing post 15. An extrusion plate 6 is elastically fitted above the fixing post 15. The extrusion plate 6 is located on the lower end face of the extrusion assembly. A conical ring 7 is installed on the lower end face of the extrusion plate 6. The conical ring 7 is sleeved on the upper circumference of the fixing post 15. The vertical section of the conical ring 7 is two right-angled triangles with the hypotenuse facing downward and symmetrically arranged. Multiple moving blocks 10 are elastically slidable inside the limiting sleeve 4. The multiple moving blocks 10 are evenly distributed around the fixing post 15. The minimum number of moving blocks 10 is four. A trapezoidal block 14 is installed on one side of the moving block 10 near the fixing post 15, and the other side extends to the outside of the limiting sleeve 4. The vertical section of the trapezoidal block 14 is a right-angled trapezoidal structure.

[0036] One application of this embodiment is as follows: In use, the limiting sleeve 4 is placed into a pre-drilled hole, and then the fixing component is pressed and rotated into the hole, causing the self-tapping stud 2 to rotate synchronously into the hole. The limiting sleeve 4 slides towards the bottom of the hole, and the threads on the surface of the self-tapping stud 2 drill a matching thread in the hole. When the limiting sleeve 4 touches the bottom of the hole, the self-tapping stud 2 is rotated further, causing the extrusion component to move into the limiting sleeve 4 and extrude the extrusion plate 6. After being extruded, the extrusion plate 6 will drive the conical ring 7 to slide closer to the fixing post 15. During the sliding process of the conical ring 7, the inclined surface of the conical ring 7 will simultaneously extrude the inclined surfaces of multiple trapezoidal blocks 14, causing the trapezoidal blocks 14 and the moving block 10 to slide outward from the limiting sleeve 4 and fit tightly against the groove wall of the hole, thereby completing the installation of the anchor bolt. It should be noted that all electrical equipment involved in this application can be powered by a battery or an external power source.

[0037] By integrating the tapping process of the self-tapping stud 2 and the anti-loosening process of pushing the moving block 10 tightly against the groove wall using the extrusion component into the same rotation operation, it is convenient to complete the hole thread tapping and anchor bolt anti-loosening fixation in one rotation of the fixing component, reducing cumbersome operation steps and improving installation efficiency. Through the cooperation of the extrusion component and the extrusion plate 6, the extrusion of multiple trapezoidal blocks 14 by the conical ring 7 is automatically triggered according to the tapping depth, so that multiple moving blocks 10 slowly and synchronously approach the groove wall, improving the continuity of tapping and anti-loosening. Through the extrusion of the groove wall by the moving block 10 and the cooperation between the thread of the self-tapping stud 2 and the hole thread, the firmness of the anchor bolt in the hole is improved.

[0038] like Figure 3 As shown, in this embodiment, the side of the movable block 10 away from the trapezoidal block 14 is equipped with an anti-slip plate 8, and a plurality of anti-slip strips 9 are installed on one side of the anti-slip plate 8. The anti-slip strips 9 increase the friction between the movable block 10 and the hole groove wall, thereby further improving the firmness of the anchor bolt in the hole.

[0039] like Figure 3 As shown, the side of the limiting sleeve 4 in this embodiment is provided with a sliding groove 11 that is adapted to the moving block 10. The sliding groove 11 is connected to the inner cavity of the limiting sleeve 4. The moving block 10 is slidably engaged in the corresponding sliding groove 11. A first storage groove 17 is provided on the lower side of the sliding groove 11. A limiting plate 16 is installed on the lower side of the moving block 10. The limiting plate 16 is slidably engaged in the first storage groove 17. A first spring 12 is installed between the limiting plate 16 and one side of the first storage groove 17. By cooperating with the first spring 12, the moving block 10 is kept in the sliding groove 11, reducing the probability that the moving block 10 will disengage from the sliding groove 11 before installation.

[0040] like Figure 3 As shown, the lower end face of the extrusion plate 6 in this embodiment is provided with a second storage groove 19. The upper end face of the second storage groove 19 and the upper end face of the fixing column 15 are both provided with second limiting grooves 18. A second spring 20 is installed between the end faces of the upper and lower second limiting grooves 18. By cooperating with the upper and lower second limiting grooves 18, the stability of the extension and retraction of the second spring 20 is improved. The probability of the tapered ring 7 sliding prematurely and squeezing the moving block 10 during the tapping process is reduced by the second spring 20.

[0041] like Figure 1 , 2 As shown, the fixing component in this embodiment includes a first protrusion 1 on the upper end face of the self-tapping stud 2. The upper end face of the first protrusion 1 is provided with a hexagonal hole. By using a tool that is compatible with the hexagonal hole to screw the first protrusion 1, it is easy to drive the self-tapping stud 2 to rotate through the rotation of the first protrusion 1.

[0042] like Figure 2 , 3As shown, the extrusion assembly of this embodiment includes a connecting post 3 disposed on the lower end face of the self-tapping stud 2, a through groove 13 disposed on the upper end face of the limiting sleeve 4, the through groove 13 being connected to the inner cavity of the limiting sleeve 4, the lower end of the connecting post 3 vertically penetrating the through groove 13, and a push post 5 disposed on the lower end face of the connecting post 3, the push post 5 being movably fitted within the limiting sleeve 4, the connecting post 3 facilitating the sliding of the push post 5, and the sliding of the push post 5 within the limiting sleeve 4 facilitating the application of thrust to the extrusion plate 6.

[0043] like Figure 3 As shown, the upper end face of the extrusion plate 6 in this embodiment is provided with a second protrusion 21, and the lower end face of the pusher 5 is provided with a rotating groove corresponding to the second protrusion 21. The pusher 5 is sleeved on the periphery of the second protrusion 21 through the rotating groove. The uniformity of the extrusion force applied by the pusher 5 to the extrusion plate 6 is improved by the cooperation between the second protrusion 21 and the rotating groove.

[0044] like Figure 3 As shown, in this embodiment, a bearing is installed on the circumference of the second protrusion 21. The bearing is installed on the circumference of the rotating groove. The bearing reduces the friction between the push column 5 and the second protrusion 21 and the extrusion plate 6 when the push column 5 rotates, thereby reducing the probability that the extrusion plate 6 will rotate along with the push column 5.

[0045] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. A self-tapping anchor bolt designed to prevent detachment, characterized in that, include: The self-tapping stud (2) has a fixing component on the upper end and an extrusion component on the lower end. A limit sleeve (4) is provided below the self-tapping stud (2), and the lower end of the extrusion component is movably fitted in the limit sleeve (4). The lower end face of the inner wall of the limiting sleeve (4) is provided with a fixed post (15), and an extrusion plate (6) is elastically fitted above the fixed post (15). A conical ring (7) is installed on the lower end face of the extrusion plate (6). The conical ring (7) is sleeved on the upper circumference of the fixed post (15). Multiple moving blocks (10) are elastically sliding inside the limiting sleeve (4). A trapezoidal block (14) is installed on one side of the moving block (10) near the fixed post (15), and the other side extends through to the outside of the limiting sleeve (4).

2. The anti-loosening self-tapping anchor bolt according to claim 1, characterized in that, The side of the movable block (10) away from the trapezoidal block (14) is equipped with an anti-slip plate (8), and a plurality of anti-slip strips (9) are installed on one side of the anti-slip plate (8).

3. The anti-loosening self-tapping anchor bolt according to claim 1, characterized in that, The side of the limiting sleeve (4) is provided with a sliding groove (11) that is compatible with the moving block (10). The lower side of the sliding groove (11) is provided with a first storage groove (17). The lower side of the moving block (10) is provided with a limiting plate (16). A first spring (12) is installed between the limiting plate (16) and one side of the first storage groove (17).

4. The anti-loosening self-tapping anchor bolt according to claim 1, characterized in that, The lower end face of the extrusion plate (6) is provided with a second storage groove (19), and the upper end face of the second storage groove (19) and the upper end face of the fixing column (15) are both provided with a second limiting groove (18). A second spring (20) is installed between the end faces of the upper and lower second limiting grooves (18).

5. The anti-loosening self-tapping anchor bolt according to claim 1, characterized in that, The fixing component includes a first protrusion (1) on the upper end face of the self-tapping stud (2), and the upper end face of the first protrusion (1) is provided with a hexagonal hole.

6. The anti-loosening self-tapping anchor bolt according to claim 1, characterized in that, The extrusion assembly includes a connecting post (3) located on the lower end face of the self-tapping stud (2), a through groove (13) on the upper end face of the limiting sleeve (4), a vertical through groove (13) at the lower end of the connecting post (3), a push post (5) on the lower end face of the connecting post (3), and the push post (5) is movably fitted inside the limiting sleeve (4).

7. A self-tapping anchor bolt for preventing detachment according to claim 6, characterized in that, The upper end face of the extrusion plate (6) is provided with a second protrusion (21), and the lower end face of the pusher (5) is provided with a rotating groove corresponding to the second protrusion (21).

8. The anti-loosening self-tapping anchor bolt according to claim 7, characterized in that, The second protrusion (21) is equipped with a bearing on its periphery, and the bearing is installed on the periphery of the rotating groove.

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