High-strength expansion bolt
By improving the design of the expansion ring and push ring of the expansion bolt, a high-strength and reliable expansion connection is achieved, which solves the shortcomings of traditional expansion bolts in terms of contact area and adaptability, improves connection stability and versatility, and reduces production costs.
Patent Information
- Application Number
- CN202520430006.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-03-12
AI Technical Summary
Traditional expansion bolts have limited contact area in their expansion parts due to structural design, resulting in poor adaptability and difficulty in meeting the requirements for high-strength and high-reliability connections. They are also prone to failure due to vibration and other reasons.
The expansion ring uses a circumferential array design for its deformation section. The protrusion of the push ring slides into the push groove, converting the axial thrust into the radial expansion force. The deformation section, combined with the wedge-shaped or arc-shaped design, forms a mechanical engagement with the hole wall. The combination of the top nut and the locking nut provides additional anchoring force.
It improves the clamping force between the expansion bolt and the hole wall, enhances the stability and versatility of the connection, avoids failure due to vibration and other reasons, simplifies the installation process, and reduces production costs.
Smart Images
Figure CN223621961U_ABST
Abstract
Description
Technical Field
[0001] The embodiments disclosed herein relate to the field of fastener technology, and more specifically, to a high-strength expansion bolt. Background Technology
[0002] In building construction and the installation of various facilities, expansion bolts are a commonly used connecting component, and their performance directly affects the stability and safety of the connection. However, traditional expansion bolts have revealed many problems in practical applications, making it difficult to meet the demands of modern engineering for high-strength and high-reliability connections.
[0003] Early expansion bolts had significant structural design flaws. Their expansion components often employed simple designs, such as a single expansion sleeve structure. After expansion, the contact area between the expansion bolt and the pre-drilled hole wall was limited, making it difficult to form sufficient mechanical engagement. This compromised the stability of the connection, making them highly susceptible to detachment after damage to the hole wall.
[0004] Traditional expansion bolts operate on a relatively simple principle, primarily relying on the radial expansion of the expansion sleeve to achieve fixation to the hole wall. This method is poorly adaptable to pre-drilled holes of different materials and diameters. For some pre-drilled holes that are harder or have irregular diameters, the expansion sleeve may not expand sufficiently, resulting in insufficient anchoring force; while for pre-drilled holes that are softer, excessive expansion may damage the hole wall structure, affecting the overall connection effect. Utility Model Content
[0005] To overcome the above-mentioned defects, the embodiments of this disclosure provide a high-strength expansion bolt, which solves the technical problem that the existing expansion bolts have a single anchoring method and are prone to failure.
[0006] According to one aspect, at least one embodiment of this disclosure provides a high-strength expansion bolt for installation within a pre-drilled hole having an inlet and outlet, comprising:
[0007] A screw rod is provided in the pre-drilled hole, the screw rod has a threaded portion that extends to the outside of the inlet / outlet, and the screw rod has a head that is located in the pre-drilled hole;
[0008] An expansion ring is disposed on the head. The expansion ring has a deformable part facing the inlet and outlet and is arranged in a plurality of circles. After deformation, the deformable part is used to abut against the wall of the pre-made hole. A pushing groove is formed between the deformable part and the screw.
[0009] A push ring is slidably disposed on the screw. The push ring has a protrusion. After sliding, the protrusion slides into or out of the push groove. The protrusion is configured such that after sliding into the push groove, the protrusion abuts against the deformation part and pushes the deformation part to deform.
[0010] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, wherein the push ring further has a top, the top and the protrusion are respectively located at both ends of the push ring, and further includes:
[0011] A tightening nut is provided, the tightening nut being threaded on the threaded portion, and the tightening nut abutting against the top.
[0012] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, the head having an annular groove for receiving one end of the expansion ring.
[0013] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, wherein the head is circular and the diameter of the head is the same as that of the pre-drilled hole.
[0014] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt in which a deformation groove is formed between two adjacent deformation portions.
[0015] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt in which the push ring is rotatably and slidably disposed on the screw, and the push ring and the tightening nut are integrally formed. The outer surface of the protrusion is provided with a ratchet portion, and the inner surface of the deformable portion is provided with a stop tooth portion. Both the ratchet portion and the stop tooth portion are arranged in a plurality of circumferentially. The ratchet portion is configured such that when the tightening nut is twisted away from the inlet / outlet side, the stop tooth portion locks the ratchet portion.
[0016] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, which further includes:
[0017] A locking nut is provided on the threaded portion and abuts against the top nut.
[0018] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, wherein the push ring has a receiving cavity, the screw passes through the receiving cavity, and the diameter of the receiving cavity is larger than the diameter of the threaded portion.
[0019] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt in which the cross-sectional area of the protrusion gradually increases from the end of the push ring toward the center.
[0020] For example, at least one embodiment of this disclosure provides a high-strength expansion bolt, wherein the protrusion has an insertion end facing the head, a guide groove is formed between the insertion end and the screw, the guide groove leads to the push groove, and the protrusion is configured to insert into the push groove along the guide groove to push the deformation portion to deform.
[0021] The beneficial effects of the embodiments disclosed herein are as follows:
[0022] In this disclosure, the deformation section of the expansion ring adopts a circumferential array design. When the protrusion of the push ring slides into the push groove, the axial thrust is converted into radial expansion force through the inclined guide. The tip of the deformation section adopts a wedge-shaped or arc-shaped design, forming a mechanical engagement after being inserted into the hole wall. Unlike expansion bolts in the prior art, the deformation section can be inserted into the pre-drilled hole wall of the wall. When pulled outward, the clamping force between the expansion ring and the hole wall gradually increases under the action of the deformation section. Compared with expansion rings in the prior art, the expansion ring and push ring have stronger compatibility with conventional bolts and can be easily installed on internal hexagon bolts to achieve expansion and relaxation, improving the versatility of the parts.
[0023] Compared with existing expansion bolts, the expansion bolt in this example not only retains the conventional loosening method of expansion bolts, but also provides additional anchoring force by inserting the deformed part into the wall of the pre-drilled hole, ensuring the anti-loosening effect of the expansion bolt and avoiding failure problems caused by vibration and other factors. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of one embodiment of the present disclosure;
[0026] Figure 2 for Figure 1 A schematic cross-sectional view of AA in the embodiment;
[0027] Figure 3 for Figure 2 A magnified structural diagram of B in the diagram;
[0028] Figure 4 for Figure 1 Schematic diagram of the push ring structure in the embodiment;
[0029] Figure 5 for Figure 1Schematic diagram of the expansion ring structure in the embodiment;
[0030] In the diagram: Screw-1, Threaded part-101, Head-102, Annular groove-103, Expansion ring-2, Deformation part-201, Push groove-202, Deformation groove-203, Stop tooth part-204, Push ring-3, Protrusion part-301, Top part-302, Racket part-303, Receiving cavity-304, Insertion end-305, Guide groove-306, Tightening nut-4, Locking nut-5. Detailed Implementation
[0031] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.
[0032] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."
[0033] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.
[0034] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0035] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.
[0036] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0037] like Figures 1-5 The diagram illustrates a high-strength expansion bolt according to an embodiment of the present disclosure, used for installation within a pre-drilled hole having an inlet and outlet. The bolt includes a screw 1, which is installed within the pre-drilled hole and has a threaded portion 101 extending to the outside of the inlet and outlet. The screw 1 also has a head 102 located within the pre-drilled hole, and an expansion ring 2 is disposed on the head 102. The expansion ring 2 has a deformation portion 201 facing outlet. The inlet is arranged in a circular pattern. The deformation part 201 is deformed and then abuts against the wall of the pre-made hole. A push groove 202 is formed between the deformation part 201 and the screw 1. The push ring 3 is slidably disposed on the screw 1. The push ring 3 has a protrusion 301. After the protrusion 301 slides, it slides into or out of the push groove 202. When the protrusion 301 is configured to slide into the push groove 202, the protrusion 301 abuts against the deformation part 201 and pushes the deformation part 201 to deform.
[0038] For example, such as Figures 1-3 As shown, the deformation portion 201 of the expansion ring 2 adopts a circumferential array design. When the protrusion 301 of the push ring 3 slides into the push groove 202, the axial thrust is converted into radial expansion force through the inclined guide. The tip of the deformation portion 201 adopts a wedge-shaped or arc-shaped design, forming a mechanical engagement after being inserted into the hole wall. Unlike the expansion bolts in the prior art, the deformation portion 201 can have the force to insert into the inner wall of the pre-made hole in the wall. When pulled outward, under the action of the deformation portion 201, the clamping force between the expansion ring 2 and the hole wall gradually increases. Compared with the expansion rings in the prior art, the expansion ring 2 and push ring 3 have stronger compatibility with conventional bolts and can be easily installed on internal hexagon bolts to achieve expansion and relaxation, improving the versatility of the parts.
[0039] Compared with existing expansion bolts, the expansion bolt in this example not only retains the conventional loosening form of expansion bolts, but also provides additional anchoring force through the force of the deformation part 201 inserted into the wall of the pre-drilled hole, ensuring the anti-loosening effect of the expansion bolt and avoiding failure problems caused by vibration and other factors.
[0040] In some examples, the push ring 3 also has a top 302, which and the protrusion 301 are located at opposite ends of the push ring 3, and also includes a tightening nut 4, which is threaded onto the threaded portion 101 and abuts against the top 302.
[0041] For example, such as Figures 1-4 As shown, the axial displacement of the push ring 3 can be precisely controlled by rotating the threaded portion 101 of the tightening nut 4. This gradual adjustment allows construction personnel to gradually apply expansion force according to the strength of the substrate, avoiding hole wall cracking caused by excessive impact force in traditional hammer-type expansion bolts. When used in aerated concrete, the deformation portion 201 of the expansion ring 2 can be expanded at a lower rate by rotating the tightening nut at a low speed, ensuring that the anchoring force matches the load-bearing capacity of the substrate. The tightening nut 4 is compatible with standard socket wrenches, reducing installation time compared to traditional expansion bolts and requiring no additional auxiliary tools.
[0042] In some examples, the head 102 has an annular groove 103 for receiving one end of the expansion ring 2.
[0043] For example, such as Figure 2 As shown, the precise positioning design of the annular groove ensures that one end of the expansion ring 2 is in a stable position during the pre-tightening process, which facilitates the determination of the contact position between the protrusion 301 and the deformation part 201.
[0044] In some examples, the head 102 is circular and has the same diameter as the pre-drilled hole.
[0045] For example, such as Figure 2 As shown, the zero-gap assembly of the nut and the pre-drilled hole reduces the concentricity error. The circular symmetrical structure makes the deformation of the deformation part 201 more uniform, and the stress structure of the hole wall of the pre-drilled hole more uniform, preventing the pre-drilled hole from collapsing and reducing the structural strength.
[0046] In some examples, a deformation groove 203 is formed between two adjacent deformation portions 201.
[0047] For example, such as Figure 5 As shown, the design of the deformation groove 203 provides deformation space for the deformation of the deformation part 201, preventing interference between two adjacent deformation parts 201 during deformation.
[0048] In some examples, the push ring 3 is rotated and slidably mounted on the screw 1, and the push ring 3 and the tightening nut 4 are integral structures. The outer surface of the protrusion 301 is provided with a ratchet portion 303, and the inner surface of the deformable portion 201 is provided with a stop tooth portion 204. Both the ratchet portion 303 and the stop tooth portion 204 are arranged in a plurality of circumferential arrangements. The ratchet portion 303 is configured such that when the tightening nut 4 is twisted away from the inlet / outlet side, the stop tooth portion 204 locks the ratchet portion 303.
[0049] For example, such as Figures 4-5 As shown, the circumferential array design (typically 12-16 teeth) of the ratchet 303 and the stop tooth 204 forms a mechanical ratchet mechanism. When the tightening nut 4 is turned clockwise (near the inlet / outlet direction), the stop tooth 204 slides along the ratchet ramp, allowing the push ring 3 to move axially; when turned counterclockwise, the stop tooth immediately engages with the ratchet groove, forming a rigid lock. The integrated design of the push ring 3 and the tightening nut 4 simplifies the traditional expansion bolt's "push ring + nut" two-part design into a single component, shortening the installation time.
[0050] In some examples, the high-strength expansion bolt also includes a locking nut 5, which is disposed on the threaded portion 101 and abuts against the top nut 4.
[0051] For example, such as Figures 1-2 As shown, the contact design between the locking nut 5 and the top-tightening nut 4 forms a dual anti-loosening system of "ratchet locking + friction self-locking". The one-way ratchet mechanism (ratchet 303 and stop tooth 204) of the top-tightening nut 4 prevents reverse rotation, while the locking nut 5, through preload, generates friction with the top-tightening nut 4, preventing relative rotation between the two. When the structure experiences slight displacement, the locking nut 5 can absorb some energy through elastic deformation, preventing the ratchet mechanism of the top-tightening nut 4 from failing due to impact overload. During construction, the basic preload is quickly established using the top-tightening nut 4, and then the locking nut 5 is used for final locking. The operation is simple, and the loosening effect is more pronounced.
[0052] In some examples, the push ring 3 has a receiving cavity 304 through which the screw 1 passes, and the diameter of the receiving cavity 304 is larger than the diameter of the threaded portion 101.
[0053] For example, such as Figures 2-3 As shown, the diameter of the receiving cavity 304 of the push ring 3 is larger than the diameter of the threaded portion 101, making it easier to install and position the push ring on the screw 1. During actual installation, workers do not need to precisely align the threads of the push ring and the screw; they can simply slip the push ring 3 onto the screw 1, significantly saving installation time. Due to the larger diameter of the receiving cavity 304, even if there are certain machining accuracy errors in the threaded portion 101 of the screw 1, the push ring can still be installed and slide smoothly. This improves product compatibility, reduces the requirements for screw manufacturing precision, and thus reduces production costs to some extent.
[0054] The larger diameter receiving cavity 304 ensures that the push ring 3 can move smoothly axially on the screw 1. When the push ring 3 is pushed by the tightening nut 4, the push ring 31 can move more stably along the screw 1 without being hindered by the threads, thereby ensuring that the deformable part 201 of the expansion ring 2 is uniformly stressed and deformed. This smooth movement helps to achieve a more uniform and sufficient expansion effect, improving the fit and anchoring force between the expansion bolt and the pre-drilled hole wall.
[0055] The smooth sliding of the push ring allows construction workers to more precisely control the expansion degree of the expansion ring 2. By observing the movement position of the push ring 3 or controlling the number of rotations of the tightening nut 4, the expansion amount can be accurately adjusted to meet the needs of different substrates and application scenarios.
[0056] In environments with significant temperature variations, the screw 1 and push ring 3 will undergo dimensional changes due to thermal expansion and contraction. The gap between the receiving cavity 301 and the threaded portion 101 of the screw 1 provides sufficient space for such dimensional changes, preventing the push ring 3 from jamming with the screw 1 due to thermal expansion and contraction, and ensuring that the expansion bolt can still function normally under different temperature conditions.
[0057] In some examples, the cross-sectional area of the protrusion 301 gradually increases from the end of the push ring 3 toward the middle.
[0058] For example, such as Figures 1-3 As shown, the cross-sectional area of the protrusion 301 gradually increases from the end to the middle (like a parabolic cross-section), causing the thrust of the push ring 3 on the deformable part 201 to gradually increase during the sliding process. When the deformable part 201 of the expansion ring 2 begins to insert into the hole wall, the smaller cross-sectional area end of the protrusion 301 contacts first, at which point the required thrust is relatively small; as the push ring 3 continues to slide, the middle part with the increased cross-sectional area gradually intervenes, and the thrust increases accordingly, ensuring that the deformable part 201 does not suddenly deform and fail to abut against the hole wall of the pre-made hole.
[0059] In some examples, the protrusion 301 has an insertion end 305 facing the head 102, and a guide groove 306 is formed between the insertion end 305 and the screw 1. The guide groove 306 leads to the push groove 202. The protrusion 301 is configured to insert into the push groove 202 along the guide groove 306, thereby pushing the deformation part 201 to deform.
[0060] For example, such as Figure 3 As shown, the wedge-shaped design of the insertion end 305 engages with the inclined surface of the guide groove 306. When the push ring 3 slides along the screw 1, the insertion end 305 aligns with the entrance of the push groove 202. Even if there is a deviation in the pre-drilled hole, self-alignment can be achieved through the guidance of the guide groove 306. The width of the guide groove 306 provides lateral displacement margin for the deformation part 201, ensuring that the thrust is evenly distributed across all deformation plates.
[0061] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.
Claims
1. A high-strength expansion bolt for installation in a pre-drilled hole, the pre-drilled hole having an inlet and outlet, characterized in that, include: A screw (1) is provided in the pre-drilled hole. The screw (1) has a threaded portion (101) that extends to the outside of the inlet and outlet. The screw (1) has a head (102) that is located in the pre-drilled hole. An expansion ring (2) is disposed on the head (102). The expansion ring (2) has a deformation part (201). The deformation part (201) faces the inlet and outlet and is arranged in a plurality of circumferentially. After deformation, the deformation part (201) is used to abut against the hole wall of the pre-made hole. A pushing groove (202) is formed between the deformation part (201) and the screw (1). Push ring (3), which is slidably disposed on the screw (1), has a protrusion (301), which slides into or out of the push groove (202) after sliding. The protrusion (301) is configured such that after sliding into the push groove (202), the protrusion (301) abuts against the deformation part (201) and pushes the deformation part (201) to deform.
2. The high-strength expansion bolt according to claim 1, characterized in that, The push ring (3) also has a top (302), the top (302) and the protrusion (301) being located at opposite ends of the push ring (3), and further includes: A top nut (4) is threaded on the threaded portion (101) and abuts against the top (302).
3. A high-strength expansion bolt according to claim 1, characterized in that, The head (102) has an annular groove (103) for receiving one end of the expansion ring (2).
4. A high-strength expansion bolt according to claim 1, characterized in that, The head (102) is circular, and the head (102) has the same diameter as the pre-made hole.
5. A high-strength expansion bolt according to claim 1, characterized in that, A deformation groove (203) is formed between two adjacent deformation portions (201).
6. A high-strength expansion bolt according to claim 2, characterized in that, The push ring (3) is rotatably and slidably disposed on the screw (1), and the push ring (3) and the tightening nut (4) are integral structures. The outer surface of the protrusion (301) is provided with a ratchet (303), and the inner surface of the deformation part (201) is provided with a stop tooth (204). The ratchet (303) and the stop tooth (204) are arranged in a plurality of circumferential arrangements. The ratchet (303) is configured such that when the tightening nut (4) is twisted away from the inlet / outlet side, the stop tooth (204) clamps the ratchet (303).
7. A high-strength expansion bolt according to claim 6, characterized in that, The high-strength expansion bolt also includes: A locking nut (5) is provided on the threaded portion (101) and abuts against the top nut (4).
8. A high-strength expansion bolt according to claim 7, characterized in that, The push ring (3) has a receiving cavity (304), the screw (1) passes through the receiving cavity (304), and the diameter of the receiving cavity (304) is larger than the diameter of the threaded portion (101).
9. A high-strength expansion bolt according to claim 1, characterized in that, The cross-sectional area of the protrusion (301) gradually increases from the end of the push ring (3) toward the middle.
10. A high-strength expansion bolt according to claim 1, characterized in that, The protrusion (301) has an insertion end (305) facing the head (102), and a guide groove (306) is formed between the insertion end (305) and the screw (1). The guide groove (306) leads to the push groove (202). The protrusion (301) is configured to insert into the push groove (202) along the guide groove (306) and push the deformable part (201) to deform.