A high-strength expansion fastener

Abstract

The utility model provides a high-strength expansion fastener, which includes an expansion sleeve and a bolt that expands the expansion sleeve. The expansion sleeve includes a sleeve head and a barrel, the sleeve head is arranged at one end of the barrel, a slit is arranged at the end of the barrel away from the sleeve head, and an anti-skid pattern is arranged on the outer wall of the barrel. An expansion hole is arranged along the axis of the barrel, and the expansion hole includes a threaded hole and a tapered hole. The threaded hole is arranged on one side of the sleeve head, and the tapered hole is arranged on one side of the slit. The bolt is screwed into the threaded hole to squeeze the tapered hole to expand outward. During the use of the utility model, the barrel opens outward from the slit, the barrel squeezes the substrate, and the anti-skid pattern is embedded in the substrate, which enhances the friction between the barrel and the substrate, improves the bearing capacity, and is suitable for large-load application environments.

Description

Technical Field

[0001] The utility model belongs to the technical field of fasteners, and in particular relates to a high-strength expansion fastener. Background Art

[0002] Expansion fasteners are a type of threaded connector commonly used to fix and support structural parts. The installation process is simple and reliable, and they can provide strong anchoring force and withstand large loads. They have the ability to form reliable connections on solid substrates such as concrete and brick walls. Traditional expansion fasteners use the mechanical expansion of the expansion sleeve to apply outward pressure to the substrate, thereby fastening it in the hole. The expansion sleeve usually has a smooth outer wall, and the friction resistance between the smooth outer wall and the substrate is small, which will lead to insufficient grip and reduced fixing force, especially when subjected to tension and vibration loads, and may gradually loosen. When subjected to tension and vibration loads, the nut may also loosen, resulting in the expansion fastener being unable to provide a stable and lasting anchoring force, and its anchoring force cannot meet the requirements of high loads.

[0003] Therefore, the above problems need to be solved urgently. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above-mentioned deficiencies, the utility model provides a high-strength expansion fastener, which improves the friction between the expansion sleeve and the substrate through anti-slip patterns and enhances the bearing capacity. The sleeve head can be screwed into the substrate through the locking thread of the sleeve head, reducing the protrusion of the sleeve head and increasing the bearing capacity of the fastener. The setting of the locking teeth improves the seismic resistance of the fastener.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the utility model provides a high-strength expansion fastener, which includes an expansion sleeve and a bolt that expands the expansion sleeve. The expansion sleeve includes a sleeve head and a barrel. The sleeve head is arranged at one end of the barrel, and a slit is arranged at the end of the barrel away from the sleeve head, and an anti-slip pattern is arranged on the outer wall of the barrel. An expansion hole is arranged along the axis of the barrel, and the expansion hole includes a threaded hole and a tapered hole. The threaded hole is arranged on one side of the sleeve head, and the tapered hole is arranged on one side of the slit. The bolt is screwed into the threaded hole to squeeze the tapered hole to expand outward. In the process of using the utility model, a reserved hole is firstly made on the surface of the substrate to be connected, and then the expansion sleeve is knocked into the reserved hole, and the bolt is screwed into the expansion hole. The bolt squeezes the inner wall of the tapered hole, so that the barrel opens outward from the slit, and the barrel squeezes the substrate. The anti-slip pattern is embedded in the substrate, which enhances the friction between the barrel and the substrate, improves the bearing capacity, and is suitable for large-load application environments.

[0006] Furthermore, in the above-mentioned high-strength expansion fastener, the sleeve head is set to be conical on one side close to the barrel, and the conical surface of the sleeve head close to the barrel is provided with a locking thread. The sleeve head is knocked into the reserved hole, and then the barrel is rotated, so that the locking thread is screwed into the base material like a self-tapping thread, which reduces the protrusion of the sleeve head on the base material surface, increases the tensile strength, and improves the bearing capacity.

[0007] Furthermore, in the above-mentioned high-strength expansion fastener, the anti-skid pattern is set to be an umbrella tooth pattern, a masonry pattern, or a pineapple pattern. When the anti-skid pattern is an umbrella tooth pattern, it can be screwed into the reserved hole of the substrate. The umbrella tooth pattern is equivalent to a thread. The expansion sleeve is screwed into the substrate through the umbrella tooth pattern. The inclined surface of each circle of the umbrella tooth interacts with the substrate, and the substrate is squeezed to form a friction resistance, so that the expansion sleeve can withstand greater tension and improve the bearing capacity of the fastener. When the anti-skid pattern is a masonry pattern or a pineapple pattern, the expansion sleeve squeezes the substrate outward, increasing the contact area between the anti-skid pattern and the substrate, which can provide better friction and enhance the bearing capacity of the fastener.

[0008] Furthermore, in the above-mentioned high-strength expansion fastener, in order to ensure that the expansion sleeve does not deflect during the expansion process, four slits are provided, and the slits are arranged at 90 degree intervals around the axis of the barrel.

[0009] Furthermore, in the above-mentioned high-strength expansion fastener, a locking groove is provided on the side of the sleeve head away from the barrel body. The expansion sleeve can be rotated through the locking groove, the locking thread is screwed into the base material, and the expansion sleeve with the anti-slip pattern of bevel teeth is screwed into the base material.

[0010] Furthermore, in the above-mentioned high-strength expansion fastener, the bolt includes a bolt head, a threaded portion, and an extrusion portion, and the bolt head, the threaded portion, and the extrusion portion are integrally arranged in sequence.

[0011] Furthermore, in the above-mentioned high-strength expansion fastener, the threaded portion is provided with a locking tooth, and the outer diameter of the locking tooth is larger than the outer diameter of the threaded portion. When the bolt is screwed into the expansion sleeve, the larger locking tooth squeezes the threaded hole, increasing the friction between the threaded hole and the bolt, forming an interference fit, avoiding the bolt from loosening when used in a vibration environment, and improving the anti-seismic performance of the expansion fastener.

[0012] Furthermore, in the above-mentioned high-strength expansion fastener, in order to improve the seismic resistance, the locking teeth are arranged close to the bolt head, and there are 1 or more locking teeth.

[0013] Furthermore, in the above-mentioned high-strength expansion fastener, the extrusion portion includes a first extrusion portion and a second extrusion portion, the cross section of the first extrusion portion forms a first angle, the cross section of the second extrusion portion forms a second angle, the first angle is smaller than the second angle, the first angle is 60 degrees, and the second angle is 80 degrees. In the process of screwing the bolt into the expansion sleeve, the first extrusion portion first opens the barrel, and then the second extrusion portion squeezes the tapered hole to open the barrel. The cross-sectional angles of the first extrusion portion and the second extrusion portion are different, so that the opening angles of the barrel in the base material are different, so that the barrel interferes in the base material, thereby strengthening the anti-slip ability of the fastener and enhancing the bearing capacity.

[0014] Furthermore, in the above-mentioned high-strength expansion fasteners, the material of the high-strength expansion fasteners is iron-based, stainless steel or aluminum-based, and the surface treatment is galvanized, Dacromet or anodized. In order to meet the use requirements of different application scenarios, different materials and surface treatment technologies are used to achieve the requirements of corrosion resistance, high strength, high load-bearing capacity and light weight. The fasteners can also be anodized to have more colors and improve aesthetics.

[0015] It can be seen from the above technical scheme that the utility model has the following beneficial effects: the high-strength expansion fastener of the utility model improves the friction between the expansion sleeve and the substrate through the anti-slip texture, thereby enhancing the bearing capacity; the sleeve head can be screwed into the substrate through the locking thread of the sleeve head, thereby reducing the protrusion of the sleeve head, thereby increasing the bearing capacity and aesthetics of the expansion fastener; and the setting of the locking teeth improves the vibration resistance of the fastener. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of the expansion sleeve having bevel teeth according to the utility model;

[0017] Figure 2 for Figure 1 A cross-sectional view of

[0018] Figure 3 is a structural schematic diagram of the bolt;

[0019] Figure 4 It is a schematic diagram of the structure of the expansion sleeve with pineapple pattern;

[0020] Figure 5 It is a schematic diagram of the expansion sleeve structure with masonry pattern.

[0021] In the figure: 1, expansion sleeve, 11, sleeve head, 111, locking thread, 12, barrel, 121, slit, 122, anti-slip pattern, 123, expansion hole, 1231, threaded hole, 1232, tapered hole, 2, bolt, 21, bolt head, 22, threaded portion, 221, locking tooth, 23, extrusion portion, 231, first extrusion portion, 232, second extrusion portion. DETAILED DESCRIPTION

[0022] Example 1

[0023] like Figure 1 A high-strength expansion fastener shown in the figure comprises an expansion sleeve 1 and a bolt 2 for expanding the expansion sleeve 1. The expansion sleeve 1 comprises a sleeve head 11 and a barrel 12. The sleeve head 11 is arranged at one end of the barrel 12. A slit 121 is provided at the end of the barrel 12 away from the sleeve head 11. In order to ensure that the expansion sleeve 1 does not deflect during expansion, four slits 121 are provided. The slits 121 are arranged at 90-degree intervals around the axis of the barrel 12. The outer wall of the barrel 12 is provided with anti-slip patterns 122. An expansion hole 123 is provided along the axis of the barrel 12. The expansion hole 123 comprises a threaded hole 1231 and a tapered hole 1232. The threaded hole 1231 is arranged on one side of the sleeve head 11, and the tapered hole 1232 is arranged on one side of the slit 121. The bolt 2 is screwed into the threaded hole 1231 to squeeze the tapered hole 1232 to expand outward. The side of the sleeve head 11 close to the barrel 12 is set as a cone, and the side of the sleeve head 11 close to the barrel 12 is provided with a locking thread 111. The side of the sleeve head 11 away from the barrel 12 is provided with a locking groove. The anti-skid pattern 122 is set as an umbrella tooth pattern. In the process of using the utility model, firstly, a reserved hole is made on the surface of the substrate to be connected, and then the expansion sleeve 1 is knocked into the reserved hole, and the bolt is screwed into the expansion hole 123, and the bolt squeezes the inner wall of the tapered hole 1232, so that the barrel 12 opens outward from the slit 121, the barrel 12 squeezes the substrate, and the anti-skid pattern 122 is embedded in the substrate.

[0024] like Figure 3 In the high-strength expansion fastener shown, the bolt 2 includes a bolt head 21, a threaded portion 22, and an extrusion portion 23, which are arranged in sequence. A straight locking groove or a cross locking groove is provided on the side of the bolt head 21 away from the threaded portion 22. The threaded portion 22 is provided with a locking tooth 221, and the outer diameter of the locking tooth 221 is larger than the outer diameter of the threaded portion 22. When the bolt 2 is screwed into the expansion sleeve 1, the larger locking tooth 221 extrudes the threaded hole 1231 to form an interference fit. The locking tooth 221 is arranged close to the bolt head 21, and there are one or more locking teeth 221. The extrusion portion 23 includes a first extrusion portion 231 and a second extrusion portion 232. The cross section of the first extrusion portion 231 forms a first angle 233, and the cross section of the second extrusion portion 232 forms a second angle 234. The first angle 233 is smaller than the second angle 234. The first angle 233 is 60 degrees, and the second angle 234 is 80 degrees.

[0025] like Figure 4-5 The high-strength expansion fastener shown, in other implementations, the anti-slip pattern 122 can be selected as a brick pattern or a pineapple pattern.

[0026] In this embodiment, the high-strength expansion fastener is made of iron-based material and is surface treated by galvanizing. In other embodiments, it can also be made of stainless steel or aluminum-based material and is surface treated by Dacromet or anodizing.

[0027] The above embodiments are exemplary, and their purpose is to illustrate the technical concept and features of the utility model so that people familiar with this field can understand the content of the utility model and implement it accordingly, and they cannot limit the protection scope of the utility model in turn. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-strength expansion fastener, characterized in that: The invention comprises an expansion sleeve (1) and a bolt (2) for expanding the expansion sleeve (1); the expansion sleeve (1) comprises a sleeve head (11) and a barrel (12); the sleeve head (11) is arranged at one end of the barrel (12); a slit (121) is arranged at one end of the barrel (12); an anti-slip pattern (122) is arranged on the outer wall of the barrel (12); an expansion hole (123) is arranged along the axis of the barrel (12); the expansion hole (123) comprises a threaded hole (1231) and a tapered hole (1232); the threaded hole (1231) is arranged at one side of the sleeve head (11); and the tapered hole (1232) is arranged at one side of the slit (121); the bolt (2) is screwed into the threaded hole (1231) to squeeze the tapered hole (1232) to expand outwards.

2. The high-strength expansion fastener according to claim 1, characterized in that: The side of the sleeve head (11) close to the barrel (12) is configured to be conical, and the side of the sleeve head (11) close to the barrel (12) is provided with a locking thread (111).

3. The high-strength expansion fastener according to claim 1, characterized in that: The anti-slip pattern (122) is configured as an umbrella tooth pattern, a brick pattern, or a pineapple pattern.

4. The high-strength expansion fastener according to claim 1, characterized in that: Four slits (121) are provided, and the slits (121) are arranged at 90-degree intervals around the axis of the barrel (12).

5. The high-strength expansion fastener according to claim 2, characterized in that: A locking groove is provided on the side of the sleeve head (11) away from the sleeve body (12).

6. The high-strength expansion fastener according to claim 1, characterized in that: The bolt (2) comprises a bolt head (21), a threaded portion (22), and an extrusion portion (23); the bolt head (21), the threaded portion (22), and the extrusion portion (23) are integrally arranged in sequence.

7. The high-strength expansion fastener according to claim 6, characterized in that: The threaded portion (22) is provided with a locking tooth (221), and the outer diameter of the locking tooth (221) is greater than the outer diameter of the threaded portion (22).

8. The high-strength expansion fastener according to claim 7, characterized in that: The locking tooth (221) is arranged close to the bolt head (21), and one or more locking teeth (221) are provided.

9. The high-strength expansion fastener according to claim 6, characterized in that: The extrusion portion (23) comprises a first extrusion portion (231) and a second extrusion portion (232); a cross section of the first extrusion portion (231) forms a first angle (233); a cross section of the second extrusion portion (232) forms a second angle (234); the first angle (233) is smaller than the second angle (234); the first angle (233) is 60 degrees, and the second angle (234) is 80 degrees.

10. The high-strength expansion fastener according to any one of claims 1 to 9, characterized in that: The high-strength expansion fastener is made of iron, stainless steel or aluminum, and is surface treated by galvanizing, Dacromet or anodizing.

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