Expansion pipe and core striking expansion nail

Abstract

The utility model relates to the technical field of fasteners, and particularly discloses an expansion pipe and a core striking expansion nail. The core striking expansion nail comprises a core nail and an expansion pipe, the expansion pipe comprises a threaded connecting part and a pipe body part, the threaded connecting part is fixedly connected with the pipe body part, threads are arranged on the outer wall and / or the inner wall of the threaded connecting part, a first through hole is formed in the threaded connecting part, and a hidden hole communicated with the first through hole is formed in the pipe body part. An expansion groove is formed in the end, away from the threaded connecting part, of the pipe body part, the width of the expansion groove is smaller than the inner diameter of the hidden hole, the expansion groove communicates with the hidden hole, and at least two expansion parts are formed at the end of the pipe body part through the expansion groove. The screw thread is arranged on the threaded connecting part of the expansion pipe and can be matched with a nut and other matched anchoring parts, various objects such as fixing hanging bars and steel frameworks in building decoration can be fixed to the expansion pipe, the use range of the expansion pipe and the core striking expansion nail is greatly expanded, and the fixing requirements of various building construction and decoration scenes are met.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to an expansion tube and a core-driving expansion nail. Background Technology

[0002] A hammer-driven expansion bolt consists of an expansion tube and a bolt core. The bolt core is inserted into the expansion tube, with one end of the expansion tube being the expansion end. In use, the expansion tube is inserted into the drilled hole, and the bolt core is struck, causing the expansion end to expand and abut against the inner wall of the drilled hole, thereby achieving the purpose of fixing.

[0003] Currently, patent CN114635905B discloses a driven rivet, including a sleeve and a rivet core. In operation, the sleeve is inserted into two plates to be riveted, a retaining ring is placed inside the sleeve, and the rivet core is inserted into the cavity of the sleeve. When the rivet core cannot proceed further, it is struck with a hammer. The lower end of the rivet core pushes the retaining ring to press against the inclined inner wall of the conical cavity. At this time, the retaining claw is deformed outwards. A retaining groove is provided on the side wall of the conical cavity. The retaining ring is pushed into the retaining groove by the rivet core. The rivet core is then removed, and the retaining ring remains inside the sleeve due to the obstruction of the retaining groove, thus completing the rivet installation. Patent CN305667844S also discloses the appearance of an expansion rivet.

[0004] However, the aforementioned drive-in rivets and expansion bolts are used for riveting between two components and cannot be used for anchoring operations. They also cannot be used to install fixtures on expansion tubes, making them inconvenient to use and difficult to meet practical application needs. Therefore, there is an urgent need to design a drive-in expansion bolt that can be used for anchoring operations and facilitates the installation of fixtures. Utility Model Content

[0005] Therefore, it is necessary to provide an expansion tube and a core-driving expansion pin to address the aforementioned technical problems.

[0006] To achieve the above objectives, on the one hand, this utility model provides an expansion tube, including a threaded connection part and a tube body part. The threaded connection part is fixedly connected to the tube body part. The outer wall and / or inner wall of the threaded connection part are provided with threads. The threaded connection part is provided with a first through hole inside. The tube body part is provided with a dark hole communicating with the first through hole inside. An expansion groove is provided at the end of the tube body part away from the threaded connection part. The width of the expansion groove is smaller than the inner diameter of the dark hole. The expansion groove communicates with the dark hole. The expansion groove causes at least two expansion parts to be formed at the end of the tube body part.

[0007] In a preferred embodiment, a flange is provided at the connection between the threaded connection and the tube body, and the threaded connection, the tube body, and the flange are integrally formed. By providing the flange, the contact area with the mounting base can be increased.

[0008] In a preferred embodiment, the diameter of the first through hole is larger than the diameter of the concealed hole. The concealed hole, through a slidable connection with the mandrel, serves as a guide for the mandrel. The larger diameter of the first through hole facilitates the insertion of the mandrel.

[0009] In a preferred embodiment, the concealed aperture includes a large-diameter aperture and a small-diameter aperture, wherein the diameter of the large-diameter aperture is larger than the diameter of the small-diameter aperture, and the small-diameter aperture is located at the end of the concealed aperture facing the expansion groove. This structural design helps the expansion section to expand more effectively.

[0010] In a preferred embodiment, the threaded connection, the tube body, the first through hole, and the concealed hole are coaxially arranged. This structural design allows for more uniform force transmission and avoids localized stress concentration.

[0011] In a preferred embodiment, the expansion groove extends into the concealed hole. This structural design facilitates better outward expansion of the expansion portion under stress.

[0012] On the other hand, this utility model also provides a core-driven expansion nail, including a core nail and any of the expansion tubes described above. The core nail includes a nail head, a nail shank, and a tip connected in sequence. The nail shank is inserted into a first through hole and a concealed hole. The minimum diameter of the tip is smaller than the width of the expansion groove, and the maximum diameter of the tip is larger than the width of the expansion groove.

[0013] In a preferred embodiment, the thread is an internal thread formed on the inner wall of the threaded connection, and the maximum diameter of the nail head is smaller than the inner diameter of the first through hole but larger than the inner diameter of the concealed hole. The nail head is located inside the first through hole, and after the core nail is struck, the nail head will not come out of the expansion tube.

[0014] In a preferred embodiment, the thread is an external thread formed on the outer wall of the threaded connection, and the maximum diameter of the nail head is larger than the inner diameter of the first through hole. This allows the nail head to protrude from the threaded connection of the expansion tube after the core nail is installed inside, facilitating the striking operation. After striking the core nail, the nail head moves to abut against the end of the threaded connection, where the threaded connection blocks the nail head from passing through, preventing the core nail from coming out of the expansion tube.

[0015] In a preferred embodiment, the nail shank is fitted with the concealed hole with a clearance. This fit ensures that the core nail can move smoothly within the expansion tube and also prevents the core nail from shaking during impact, thus ensuring the impact effect and the expansion effect of the expansion tube.

[0016] The beneficial effects of this technical solution are as follows: By providing threads at the threaded connection part of the expansion tube, it can be used with matching anchors such as nuts to fix various objects onto the expansion tube, such as fixing hanging rods and steel frames in building decoration. This greatly expands the application range of expansion tubes and core-driven expansion nails, and meets the fixing needs of various building construction and decoration scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the core-driving expansion pin of Embodiment 1 of this utility model;

[0018] Figure 2 This is a front view of the core-driving expansion pin of Embodiment 1 of this utility model;

[0019] Figure 3 This is a right view of the core-driving expansion pin of Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of the expansion tube in Embodiment 1 of this utility model;

[0021] Figure 5 This is a schematic diagram of the core-driving expansion pin in Embodiment 2 of this utility model;

[0022] Figure 6 This is a front view of the core-driving expansion pin of Embodiment 2 of this utility model;

[0023] In the figure, 1 is the threaded connection; 11 is the thread; 12 is the first through hole; 2 is the tube body; 21 is the concealed hole; 211 is the large diameter hole; 212 is the small diameter hole; 22 is the expansion groove; 23 is the expansion part; 3 is the core nail; 31 is the nail head; 32 is the nail shank; 33 is the tip; and 4 is the flange. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] Example 1: Please refer to Figures 1 to 4 This application provides a core-driven expansion pin, including a core pin 3 and an expansion tube. The expansion tube is made of ML08A carbon steel, and the core pin 3 is made of No. 55 high-strength steel. The hardness of the core pin 3 is greater than that of the expansion tube.

[0026] The expansion tube includes a threaded connection part 1 and a tube body part 2. The threaded connection part 1 is fixedly connected to the tube body part 2. The thread 11 is an external thread opened on the outer wall of the threaded connection part 1. The threaded connection part 1 has a first through hole 12 inside. The tube body part 2 has a dark hole 21 that communicates with the first through hole 12 inside. An expansion groove 22 is opened at the end of the tube body part 2 away from the threaded connection part 1. The width of the expansion groove 22 is smaller than the inner diameter of the dark hole 21. The expansion groove 22 communicates with the dark hole 21 and extends into the dark hole 21. This is beneficial for the expansion part 23 to expand outward better when subjected to force.

[0027] In this embodiment, the cross-section of the expansion groove 22 is in the shape of a straight line, and the expansion groove 22 causes two expansion portions 23 to be formed at the end of the tube body portion 2.

[0028] It should be noted that in other embodiments, there may be two or more expansion portions 23. For example, three expansion portions 23 are formed at the end of the tube body 2, and the cross-section of the expansion groove 22 is triangular-star shaped. For example, four expansion portions 23 are formed at the end of the tube body 2, and the cross-section of the expansion groove 22 is cross-shaped. Different shapes of expansion grooves 22 can be selected according to actual usage requirements to obtain different expansion effects and fixing strengths.

[0029] To improve installation stability, a flange 4 is provided at the connection between the threaded connection part 1 and the tube body part 2. The flange 4 increases the contact area with the mounting base. Furthermore, the threaded connection part 1, the tube body part 2, and the flange 4 are integrally formed, which enhances the overall structural strength and stability of the expansion tube, while also facilitating manufacturing.

[0030] The concealed hole 21 includes a large-diameter hole 211 and a small-diameter hole 212. The diameter of the large-diameter hole 211 is larger than the diameter of the small-diameter hole 212, and the small-diameter hole 212 is located at the end of the concealed hole 21 facing the expansion groove 22. The diameter of the first through hole 12 is larger than the diameters of the large-diameter hole 211 and the small-diameter hole 212, which facilitates the insertion of the core pin 3. The small-diameter hole 212 is slidably connected to the core pin 3, serving as a guide for the core pin 3.

[0031] It should be noted that the above structural design can better cooperate with the core nail 3, allowing the compressive force generated by the tip 33 of the core nail 3 during impact to be transmitted more directly and efficiently to the expansion part 23. When the tip 33 is inserted into the expansion groove 22, the expansion part 23 can begin to deform under force from the inside near the dark hole 21, thereby achieving more complete and uniform expansion, increasing the contact area between the expansion part 23 and the inner wall of the drilled hole, and significantly enhancing the anchoring firmness. Furthermore, it shortens the force transmission distance from the core nail 3 to the expansion part 23. Compared to a structure where the expansion groove 22 does not extend into the dark hole 21, the extended design allows the force of the core nail 3 to be applied more precisely to the expansion part 23, avoiding force dispersion or deviation, and enabling the expansion part 23 to expand outward better under force, ensuring the stable performance of the core-expansion nail fixing function.

[0032] The threaded connection 1, the tube body 2, the first through hole 12, and the concealed hole 21 are coaxially arranged. This coaxial structure allows for more even force transmission when the expansion tube is under stress, avoiding localized stress concentration. During the use of the core-driven expansion pin, when the core pin 3 is inserted into the first through hole 12 and the concealed hole 21 and struck, the force is smoothly transmitted along the axial direction to the tube body 2, causing the expansion part 23 to expand evenly, enhancing its fit with the inner wall of the drilled hole, and improving the overall fixing effect and structural stability.

[0033] The core nail 3 includes a nail head 31, a nail shank 32, and a tip 33 connected in sequence. The nail shank 32 is inserted into the first through hole 12 and the concealed hole 21. The diameter of the end of the tip 33 away from the nail shank 32 is smaller than the diameter of the end closer to the nail shank 32, and the cross-sectional area of ​​the tip 33 gradually increases along its length. For example, the tip 33 has a conical structure, and the minimum diameter of the tip 33 is smaller than the width of the expansion groove 22, so that a part of the tip 33 can be directly inserted into the expansion groove 22. The maximum diameter of the tip 33 is larger than the width of the expansion groove 22, so that when the core nail 3 is struck, the tip 33 can be fully inserted into the expansion groove 22 under the action of external force, thereby expanding the expansion portion 23.

[0034] The nail shank 32 is clearance-fitted with the small-diameter hole 212 of the concealed hole 21. The small-diameter hole 212 guides the nail shank 32. This fit ensures that the core nail 3 can move smoothly inside the expansion tube and also prevents the core nail 3 from shaking during the impact, thus ensuring the impact effect and the expansion effect of the expansion tube.

[0035] When using a core-driven expansion nail, first drill a hole of appropriate size in the installation substrate, such as the concrete wall surface mentioned above, insert the expansion tube into the hole, and then use a tool to strike the nail head 31. During the striking process, the core nail 3 is subjected to external force and moves into the expansion tube along the axial direction. The tip 33 of the core nail 3 gradually inserts into the expansion groove 22. Since the maximum diameter of the tip 33 is greater than the width of the expansion groove 22, as the core nail 3 continues to penetrate, the tip 33 exerts an outward squeezing force on the expansion part 23, causing the expansion part 23 to gradually expand outward and tightly abut against the inner wall of the drill hole, thus achieving the anchoring operation.

[0036] If it is necessary to fix objects, nuts or other matching anchors can be screwed into the threaded connection part 1 to fix the objects to the expansion tube, thereby meeting the actual use requirements. For example, when fixing suspension rods in building decoration, the suspension rods are connected to the threaded connection part 1 and further tightened with nuts; when fixing steel frames, the mounting holes on the steel frames are first aligned with the threaded connection part of the expansion tube, and then nuts are used to fasten the steel frames to the expansion tube to ensure the stability of the steel frames.

[0037] Example 2: Please refer to Figure 5 and Figure 6 This embodiment is largely the same as embodiment 1, except that the thread 11 is an internal thread opened on the inner wall of the threaded connection part 1, that is, an internal thread is provided on the inner wall of the first through hole 12.

[0038] Furthermore, the maximum diameter of the nail head 31 is smaller than the inner diameter of the first through hole 12 but larger than the inner diameter of the concealed hole 21. In this way, the nail head 31 can be located inside the first through hole 12. When the striking device strikes the nail head 31 inside the first through hole 12, and the nail head 31 moves to the step formed at the connection between the first through hole 12 and the concealed hole 21, the step will block the nail head 31 from passing through, thus preventing the core nail 3 from coming out of the expansion tube.

[0039] When using a core-driven expansion bolt, first drill a hole of appropriate size in the mounting base, insert the expansion tube into the hole, and then use a tool to strike the bolt head 31. This causes the tip 33 of the core bolt 3 to gradually expand the expansion portion 23 of the expansion tube, making the expansion portion 23 tightly abut against the inner wall of the drill hole, thus achieving anchoring. If it is necessary to fix an object, a matching anchor such as a bolt that mates with the internal thread can be screwed into the threaded connection 1 to fix the object to the expansion tube, or the object itself can be directly threaded into the threaded connection 1 to meet actual usage requirements.

[0040] Example 3: This example is largely the same as Example 2, except that threads 11 are provided on both the outer and inner walls of the threaded connection part 1. That is, the threads 11 include internal threads on the inner wall of the threaded connection part 1 and external threads on the outer wall of the threaded connection part 1.

[0041] It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0042] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, 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, and therefore should not be construed as a limitation of this utility model.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. An expansion tube, characterized in that, The tube includes a threaded connection part (1) and a tube body part (2). The threaded connection part (1) is fixedly connected to the tube body part (2). The outer wall and / or inner wall of the threaded connection part (1) are provided with threads (11). The threaded connection part (1) is provided with a first through hole (12). The tube body part (2) is provided with a dark hole (21) communicating with the first through hole (12). An expansion groove (22) is provided at one end of the tube body part (2) away from the threaded connection part (1). The width of the expansion groove (22) is smaller than the inner diameter of the dark hole (21). The expansion groove (22) communicates with the dark hole (21). The expansion groove (22) causes at least two expansion parts (23) to be formed at the end of the tube body part (2).

2. The expansion tube according to claim 1, characterized in that, The threaded connection part (1) and the tube body part (2) are provided with a flange (4), and the threaded connection part (1), the tube body part (2) and the flange (4) are integrally formed.

3. The expansion tube according to claim 1, characterized in that, The diameter of the first through hole (12) is larger than the diameter of the dark hole (21).

4. The expansion tube according to claim 1, characterized in that, The dark hole (21) includes a large-diameter hole (211) and a small-diameter hole (212). The diameter of the large-diameter hole (211) is larger than the diameter of the small-diameter hole (212). The small-diameter hole (212) is located at the end of the dark hole (21) facing the expansion groove (22).

5. The expansion tube according to claim 1, characterized in that, The threaded connection part (1), the tube body part (2), the first through hole (12) and the hidden hole (21) are arranged coaxially.

6. The expansion tube according to claim 1, characterized in that, The expansion groove (22) extends into the dark hole (21).

7. A type of core-driving expansion nail, characterized in that, Includes a core pin (3) and an expansion tube as described in any one of claims 1 to 6. The core pin (3) includes a head (31), a shank (32) and a tip (33) connected in sequence. The shank (32) is inserted into the first through hole (12) and the dark hole (21). The minimum diameter of the tip (33) is smaller than the width of the expansion groove (22), and the maximum diameter of the tip (33) is larger than the width of the expansion groove (22).

8. The core-driving expansion pin according to claim 7, characterized in that, The thread (11) is an internal thread (11) opened on the inner wall of the threaded connection part (1). The maximum diameter of the nail head (31) is smaller than the inner diameter of the first through hole (12) and larger than the inner diameter of the dark hole (21).

9. The core-driving expansion pin according to claim 7, characterized in that, The thread (11) is an external thread opened on the outer wall of the threaded connection part (1), and the maximum diameter of the nail head (31) is greater than the inner diameter of the first through hole (12).

10. The core-driving expansion pin according to claim 8 or 9, characterized in that, The nail rod (32) is fitted with the hole (21) with a clearance.

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