High-strength expansion screw with barbs

Abstract

The high-strength expansion screw comprises a screw rod and an expansion pipe arranged on the screw rod in a sleeving mode, the expansion pipe comprises a first barb part and a sleeve part, the outer side wall of the sleeve part is provided with a second barb part and a third barb part in the circumferential direction, and the second barb part and the third barb part are adjacently arranged; a first opening seam and a second opening seam are distributed in the circumferential direction of the sleeve part, the first opening seam and the second opening seam extend towards the first barb part at the end, away from the first barb part, of the sleeve part, the first opening seam penetrates through the two ends of the sleeve part, and expansion openings are formed in the first opening seam and the second opening seam; and the expansion hole is formed in the middle of the sleeve part. Therefore, during specific application, the expansion pipe is easier to expand, in the expansion process, the first barb part, the second barb part and the third barb part are easy to pierce into the hole wall, the fastening effect is improved, good fastening performance can be kept in long-term use, and the loosening problem caused by external factors is prevented.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a high-strength expansion screw with barbs. Background Technology

[0002] Expansion bolts are a common type of fastener used in construction, interior decoration, and many other fields to securely fasten various structures or equipment to installations. Existing expansion bolts typically consist of a threaded rod with a tapered plug and an expansion tube fitted onto it. During installation, a hole is first drilled in the surface of the installation object. Then, the expansion tube is fitted onto the smooth portion of the threaded rod, and the two are driven into the hole together by hammering. Next, the fastener is fitted onto the threaded portion of the threaded rod, and the threaded rod is moved by tightening the nut. As the threaded rod advances, the tapered plug gradually compresses the expansion tube, causing it to expand outwards and fit tightly against the hole wall, achieving a secure connection.

[0003] However, this traditional expansion screw design has certain shortcomings. Specifically, during prolonged use, due to external factors such as vibration and temperature changes, the contact surface between the expansion screw and the installed object may experience slight displacement or loosening. This causes the pressure of the expansion tube on the hole wall to gradually weaken, eventually leading to rotation between the expansion screw and the installed object, reducing the tightening effect, and may even cause the fastener to fall off.

[0004] Therefore, it is necessary to develop an improved expansion screw device that can maintain good fastening performance during long-term use, prevent loosening caused by external factors, and thus improve the reliability and safety of the entire system. Utility Model Content

[0005] Therefore, this application provides a high-strength expansion screw with barbs to solve the technical problem that the tightening effect of expansion screws decreases with prolonged use in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A high-strength expansion screw with barbs includes a screw rod with a plug at one end, characterized in that it further includes an expansion tube sleeved on the screw rod, the expansion tube including a first barb portion and a sleeve portion, the first barb portion being disposed at the end of the sleeve portion away from the plug of the screw rod, and the cross-sectional diameter of the first barb portion being larger than the cross-sectional diameter of the sleeve portion;

[0008] The outer wall of the sleeve is provided with a second barb and a third barb along the axial direction, and the second barb and the third barb are arranged adjacent to each other.

[0009] The sleeve portion is provided with a first slit and a second slit in the circumferential direction. Both the first slit and the second slit extend toward the first barb portion from the end of the sleeve portion away from the first barb portion, and the first slit passes through both ends of the sleeve portion.

[0010] Expansion openings are provided on the first slit and the second slit, and the expansion openings are located in the middle of the sleeve portion;

[0011] The screw has a fastening part at the end away from the plug, and the fastening part is pressed together with the end of the first barb away from the sleeve.

[0012] Optionally, the first slit is provided with one slit, and an expansion opening is provided at the end of the first slit away from the first barb. The second slit is provided with at least two slits, and an expansion opening is provided at the end of the second slit away from the first barb.

[0013] Optionally, the second barb portion includes two or more second barbs, the second barbs are arranged circumferentially on the outer wall of the sleeve portion, the end of the second barb away from the sleeve portion faces the first barb portion, and the shape of the second barb is triangular.

[0014] Optionally, the third barb portion includes two or more third barbs, the third barbs are arranged circumferentially on the outer side wall of the sleeve portion, the end of the third barb away from the sleeve portion faces the first barb portion, and the shape of the third barb is quadrilateral.

[0015] Optionally, the expansion opening is an inclined "Z"-shaped hole.

[0016] Optionally, the expansion opening is a circular hole.

[0017] Optionally, the expansion opening is a waist-shaped opening.

[0018] Alternatively, the expansion screw may include at least two expansion tubes, which are sequentially sleeved on the screw in the same direction.

[0019] Optionally, the fastening part includes a threaded portion integrally disposed on the end of the screw away from the plug, a nut threadedly connected to the threaded portion, and a washer disposed between the nut and the first barb portion.

[0020] Compared with the prior art, this application has at least the following beneficial effects:

[0021] A high-strength expansion screw with barbs includes a screw rod with a plug at one end and a fastening part at the other end, and an expansion tube sleeved on the screw rod. The expansion tube includes a first barb and a sleeve. The first barb is located at the end of the sleeve away from the plug of the screw rod. The outer wall of the sleeve is provided with a second barb and a third barb in the circumferential direction. The second barb and the third barb are arranged adjacent to each other. A first slit and a second slit are distributed in the circumferential direction of the sleeve. Both the first slit and the second slit extend toward the first barb at the end of the sleeve away from the first barb, and the first slit passes through both ends of the sleeve. An expansion opening is provided on the first slit and the second slit, and the expansion opening is located in the middle of the sleeve. Therefore, in practical applications, since the first slit runs through both ends of the sleeve, the expansion tube is easier to expand. During the expansion process, it no longer relies solely on the expansion tube to expand and fit against the hole wall. The first barb, the second barb, and the third barb also expand and penetrate into the hole wall, increasing the fastening effect. Moreover, it can maintain good fastening performance during long-term use and prevent loosening problems caused by external factors. Attached Figure Description

[0022] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0023] Figure 1 This application provides a schematic diagram of the structure of an expansion tube for a high-strength expansion screw with barbs, as shown in the embodiments of this application.

[0024] Figure 2 A schematic diagram of another expansion tube for a high-strength expansion screw with barbs provided in an embodiment of this application;

[0025] Figure 3 A schematic diagram of another type of expansion tube with barbs provided for embodiments of this application;

[0026] Figure 4 This is a schematic diagram of a high-strength expansion screw with barbs provided in an embodiment of this application;

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Screw; 2. Expansion tube; 3. First barb; 4. Sleeve; 41. Second barb; 42. Third barb; 43. First slit; 44. Second slit; 45. Expansion opening; 46. Expansion opening; 5. Threaded part; 6. Nut; 7. Washer. Detailed Implementation

[0029] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] refer to Figures 1 to 4 As shown, this embodiment provides a high-strength expansion screw with barbs, including: a screw rod 1 and an expansion tube 2. One end of the screw rod 1 is provided with a plug, and the other end is provided with a fastening part. The expansion tube 2 is sleeved between the plug and the fastening part.

[0031] Specifically, the expansion tube 2 includes a first barb portion 3 and a sleeve portion 4. The first barb portion 3 is located at the end of the sleeve portion 4 away from the plug of the screw 1. The end of the first barb portion 3 away from the sleeve portion 4 is squeezed and connected to the fastening portion, that is, the fastening portion can squeeze the expansion tube 2, thereby causing the expansion tube 2 to expand. The cross-sectional diameter of the first barb portion 3 is larger than the cross-sectional diameter of the sleeve portion 4, which facilitates the squeezing of the expansion tube 2 by the fastening portion.

[0032] The outer wall of the sleeve 4 is provided with a second barb 41 and a third barb 42 along the axial direction. The second barb 41 and the third barb 42 are arranged adjacent to each other, that is, on the side wall of the expansion tube 2, there is a ring of second barb 41, a ring of third barb 42 arranged adjacent to each other, and then another ring of second barb 41. The second barb 41 and the third barb 42 are alternately and repeatedly arranged in this order.

[0033] The sleeve portion 4 is provided with a first slit 43 and a second slit 44 in the circumferential direction. Both the first slit 43 and the second slit 44 extend toward the first barb 3 at the end of the sleeve portion 4 away from the first barb 3, and the first slit 43 penetrates through both ends of the sleeve portion 4, so that both ends of the sleeve portion 4 can expand at the same time, making the expansion tube 2 easier to expand.

[0034] Expansion openings 45 are provided on the first slit 43 and the second slit 44. The expansion openings 45 are located in the middle of the sleeve portion 4. The middle portion here refers to any position other than the two ends of the sleeve portion 4. Preferably, the middle position is the middle section of the sleeve portion 4.

[0035] The expansion tube 2 is provided with a first slit 43, a second slit 44 and an expansion hole 45, and the first slit 43 passes through both ends of the sleeve part 4, making the expansion tube 2 easier to expand. During the expansion process, the first barb 3, the second barb 41 and the third barb 42 can easily penetrate into the hole wall, increasing the fastening effect. Moreover, the expansion screw can maintain good fastening performance during long-term use.

[0036] The shape of the expansion opening 45 can be an inclined "Z" shaped hole, a circular hole, or an oblong hole.

[0037] In a preferred embodiment, the first slit 43 is provided with one slit, and an expansion opening 46 is provided at the end of the first slit 43 away from the first barb 3. The second slit 44 is provided with two or more slits, and an expansion opening 46 is provided at the end of the second slit 44 away from the first barb 3. This facilitates the expansion of the expansion tube 2.

[0038] The second barb portion 41 includes two or more second barbs. The second barbs are arranged in a circumferential direction on the outer wall of the sleeve portion 4. The end of the second barb away from the sleeve portion faces the first barb portion (3), that is, the opening formed between the second barb and the sleeve portion 4 faces the first barb portion 3. The included angle formed between the second barb and the sleeve portion 4 is an acute angle. Thus, when the second barb enters the hole with the expansion tube 2, as the expansion tube 2 expands, the second barb forms a self-locking relationship with the hole wall, making it difficult to pull out the expansion screw.

[0039] The second barb is triangular in shape, making it easier for it to penetrate the hole wall.

[0040] The third barb portion 42 includes two or more third barbs. The third barbs are arranged in a circumferential direction on the outer wall of the sleeve portion 4. The end of the third barb away from the sleeve portion faces the first barb portion (3), that is, the opening formed between the third barb and the sleeve portion 4 faces the first barb portion 3. The included angle formed between the third barb and the sleeve portion 4 is an acute angle. Thus, when the third barb enters the hole with the expansion tube 2, as the expansion tube 2 expands, the third barb forms a self-locking relationship with the hole wall, making it difficult to pull out the expansion screw.

[0041] The third barb is quadrilateral in shape. This quadrilateral third barb penetrates into the hole wall, making it difficult for the expansion tube 2 to move slightly in the circumferential direction.

[0042] In a preferred embodiment, the expansion screw includes two or more expansion tubes 2, which are sequentially sleeved on the screw 1 in the same direction. That is, the expansion tubes 2 are combined according to different working conditions to adapt to the needs of different hole depths.

[0043] In a preferred embodiment, the fastening part includes a threaded portion 5 integrally formed at the end of the screw 1 away from the plug, a nut 6 threadedly connected to the threaded portion 5, and a washer 7 disposed between the nut 6 and the first barb portion 3. By tightening the nut 6, the nut 6 and the plug are squeezed against the expansion tube 2, thereby causing the expansion tube 2 to expand.

[0044] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A high-strength expansion screw with barbs, comprising a screw rod (1) with a plug at one end, characterized in that, It also includes an expansion tube (2) sleeved on the screw (1), the expansion tube (2) includes a first barb (3) and a sleeve (4), the first barb (3) is disposed at the end of the sleeve (4) away from the plug of the screw (1), and the cross-sectional diameter of the first barb (3) is larger than the cross-sectional diameter of the sleeve (4); The outer side wall of the sleeve (4) is provided with a second barb (41) and a third barb (42) along the axial direction, and the second barb (41) and the third barb (42) are arranged adjacent to each other; The sleeve portion (4) is provided with a first slit (43) and a second slit (44) in the circumferential direction. The first slit (43) and the second slit (44) both extend from the end of the sleeve portion (4) away from the first barb portion (3) toward the first barb portion (3), and the first slit (43) penetrates both ends of the sleeve portion (4). Expansion openings (45) are provided on the first slit (43) and the second slit (44), and the expansion openings (45) are located in the middle of the sleeve portion (4); The screw (1) has a fastening part at the end away from the plug, and the fastening part is squeezed to the end of the first barb (3) away from the sleeve (4).

2. The high-strength expansion screw with barbs according to claim 1, characterized in that, The first slit (43) is provided with one slit, and an expansion opening (46) is provided at the end of the first slit (43) away from the first barb (3). The second slit (44) is provided with at least two slits, and an expansion opening (46) is provided at the end of the second slit (44) away from the first barb (3).

3. A high-strength expansion screw with barbs according to claim 1, characterized in that, The second barb portion (41) includes two or more second barbs, which are arranged circumferentially on the outer side wall of the sleeve portion (4), with the end of the second barb away from the sleeve portion facing the first barb portion (3), and the shape of the second barb is triangular.

4. A high-strength expansion screw with barbs according to claim 1, characterized in that, The third barb portion (42) includes two or more third barbs, which are arranged circumferentially on the outer side wall of the sleeve portion (4). The end of the third barb away from the sleeve portion faces the first barb portion (3), and the shape of the third barb is quadrilateral.

5. A high-strength expansion screw with barbs according to claim 1, characterized in that, The expansion opening (45) is an inclined "Z" shaped hole.

6. A high-strength expansion screw with barbs according to claim 1, characterized in that, The expansion opening (45) is a circular hole.

7. A high-strength expansion screw with barbs according to claim 1, characterized in that, The expansion opening (45) is a waist-shaped opening.

8. A high-strength expansion screw with barbs according to claim 2, characterized in that, The expansion screw includes at least two expansion tubes (2), which are sequentially sleeved on the screw (1) in the same direction.

9. A high-strength expansion screw with barbs according to claim 1, characterized in that, The fastening part includes a threaded part (5) integrally disposed on the end of the screw (1) away from the plug, a nut (6) threadedly connected to the threaded part (5), and a washer (7) disposed between the nut (6) and the first barb (3).

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