Penetrating type self-undercut anchor bolt

Abstract

The utility model relates to the field of anchor bolts, and discloses a penetrating type self-undercut anchor bolt which comprises an undercut conical head, the undercut conical head is slidably arranged on an anchor bolt body in a sleeved mode, external threads are formed in the outer wall of the anchor bolt body, a circular truncated cone part is fixed to the bottom end of the anchor bolt body, the external threads are in threaded connection with a nut, and the nut is in threaded connection with the undercut conical head. A plurality of expansion pieces are fixed to the bottom end of the bottom cutting conical head, cutting edges are arranged on the outer sides of the expansion pieces respectively, protruding blocks are fixed to the outer walls of the expansion pieces respectively, and the protruding blocks are all conical. According to the utility model, the whole body can be fixed preliminarily through the expansion pieces and the cutting edges, and meanwhile, the contact area and the binding force with a wall body can be increased through the convex blocks, so that the whole body can be fixed secondarily, the pulling resistance can be increased, and the fixing effect and the stability of the whole body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of anchor bolts, in particular to a through-type self-drilling bottom anchor bolt. Background Technique

[0002] An anchor bolt refers to the general term for all post-anchoring components, with a wide range. It can be divided into metal anchor bolts and non-metal anchor bolts according to different raw materials. According to different anchoring mechanisms, it can be divided into expansion-type anchor bolts, reaming-type anchor bolts, adhesive-type anchor bolts, concrete screws, nail guns, concrete nails, etc. When installing a self-drilling bottom anchor bolt, it is necessary to use an expanding anchor head to open a hole. When the bolt is tightened, the expansion part expands and fixes in the hole.

[0003] According to the Chinese patent with the publication number: CN216199639U, a self-drilling bottom anchor bolt belongs to the technical field of fasteners, including a screw rod and an expansion part. The expansion part is sleeved on the screw rod and positioned by a gasket and a nut arranged on the screw rod. The expansion part includes a sleeve and a plurality of expansion pieces fixed at the end of the sleeve. A circular concave part is formed at the position where the expansion piece is connected to the sleeve, and an opening is arranged on the circular concave part; anti-slip grooves are arranged on the two end faces of the gasket.

[0004] In the above solution, the expansion piece is unfolded by the screw rod, and the blade cuts into the wall for fixation, resulting in the following disadvantages: when the anchor bolt is used, it only performs a single cutting fixation through the blade, so that its fixation strength is limited and the pull-out resistance is insufficient, resulting in a reduction in the overall fixation effect and stability. Content of the Utility Model

[0005] The purpose of the utility model is to provide a through-type self-drilling bottom anchor bolt to solve the problem that when the anchor bolt is used, it only performs a single cutting fixation through the blade, so that its fixation strength is limited and the pull-out resistance is insufficient, resulting in a reduction in the overall fixation effect and stability.

[0006] To achieve the above utility model purpose, the utility model adopts the following technical scheme: a through-type self-drilling bottom anchor bolt includes a bottom-cutting cone head that is slidably sleeved on the anchor bolt body. The outer wall of the anchor bolt body is provided with an external thread. A frustum part is fixed at the bottom end of the anchor bolt body. The external thread is threadedly connected with a nut. A plurality of expansion pieces are fixed at the bottom end of the bottom-cutting cone head. Blades are respectively arranged on the outer sides of the plurality of expansion pieces. Convex blocks are respectively fixed on the outer walls of the plurality of expansion pieces, and the shapes of the plurality of convex blocks are all conical.

[0007] Preferably, a washer is arranged between the anchor bolt body and the nut.

[0008] Preferably, a plurality of anti-slip protrusions are arranged on the bottom surface of the washer.

[0009] Preferably, a plurality of rotation grooves are respectively formed on the left and right inner walls of the bottom-cutting cone head, and a plurality of balls are rotatably arranged in the plurality of rotation grooves, and the outer walls of the plurality of balls are respectively in contact with the outer wall of the anchor bolt body.

[0010] Preferably, clamping holes are respectively formed on the front and rear sides of the inner wall of the bottom-cutting cone head.

[0011] Preferably, the thickness of the washer is 0.5 mm.

[0012] Compared with the prior art, a penetrating self-bottom-cutting anchor bolt adopting the above technical solution has the following

[0013] Beneficial effects:

[0014] First, during use, the expansion piece and the blade are beneficial for initially fixing the whole, and at the same time, the bump can increase the contact area and bonding force with the wall, which is beneficial for secondary fixing of the whole, so as to increase the anti-pulling force and improve the overall fixing effect and stability;

[0015] Second, during use, the washer is arranged between the anchor bolt body and the nut, which not only plays a buffering role to prevent the nut from directly pressing and causing damage to the wall surface or the anchor bolt body. The anti-slip protrusions of the washer increase the friction force, ensuring that the washer is not easy to slide when pressure is applied, enhancing the locking effect of the nut, helping to improve the firmness of the connection, and ensuring that it is not easy to loosen during long-term use;

[0016] Third, during use, when the anchor bolt body rises, the rolling friction of the balls reduces the friction force with the inner wall of the bottom-cutting cone head, enabling the anchor bolt body to move upward smoothly, avoiding installation difficulties or damage caused by excessive frictional resistance, reducing the frictional resistance during the installation process, and improving the installation efficiency. The clamping holes are beneficial for providing a convenient access point for the driving tool, enhancing the expandability and flexibility of the device. By setting the thickness of the washer to 0.5 mm, it not only ensures sufficient buffering and anti-slip effects, but also avoids problems such as installation space limitations caused by excessive thickness or poor effects caused by too thin thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the embodiment.

[0018] Figure 2 It is an exploded schematic diagram of the embodiment.

[0019] Figure 3 It is a structural schematic diagram of the expansion piece and the bump in the embodiment.

[0020] Figure 4 It is of the embodiment Figure 2 The enlarged schematic diagram at A in

[0021] In the figure: 1. Bottom-cutting cone head; 2. Anchor bolt body; 3. External thread; 4. Frustum part; 5. Nut; 6. Expansion piece; 7. Blade; 8. Protrusion; 9. Washer; 10. Anti-slip protrusion; 11. Rotation groove; 12. Ball; 13. Clamping hole. Specific embodiments

[0022] The following will combine with the attached drawings to make a detailed description of the preferred embodiments of the present utility model.

[0023] As Figures 1-4 shown, a penetrating self-bottom-cutting anchor bolt includes a bottom-cutting cone head 1, the bottom-cutting cone head 1 is slidably sleeved on the anchor bolt body 2, an external thread 3 is provided on the outer wall of the anchor bolt body 2, a frustum part 4 is fixed at the bottom end of the anchor bolt body 2, the external thread 3 is threadedly connected with a nut 5, a plurality of expansion pieces 6 are fixed at the bottom end of the bottom-cutting cone head 1, blades 7 are respectively arranged on the outer sides of the plurality of expansion pieces 6, protrusions 8 are respectively fixed on the outer walls of the plurality of expansion pieces 6, and the shapes of the plurality of protrusions 8 are all conical.

[0024] During use, the staff first sleeved the bottom-cutting cone head 1 on the anchor bolt body 2 to assemble the device, then drilled a hole in the wall according to the size of the device, then placed the object to be installed in the corresponding position, passed the device through the through hole of the object to be installed and inserted it into the hole in the wall, and then rotated the nut 5 to make the anchor bolt body 2 move upward, thereby driving the frustum part 4 to move upward. Its gradually rising form effectively promoted the expansion of the expansion piece 6, enabling the blade 7 to cut into the wall, achieving preliminary stable fixation, and at the same time driving the protrusion 8 to cut into the wall for secondary fixation.

[0025] The expansion piece 6 and the blade 7 are beneficial for the preliminary fixation of the whole, and at the same time, the protrusion 8 can increase the contact area and bonding force with the wall, which is beneficial for the secondary fixation of the whole, thereby increasing the anti-pulling force and improving the overall fixation effect and stability.

[0026] As Figure 1 and Figure 2 shown, a washer 9 is provided between the anchor bolt body 2 and the nut 5.

[0027] During use, the washer 9 is arranged between the anchor bolt body 2 and the nut 5, which not only plays a buffering role to prevent the nut 5 from directly pressing and causing damage to the wall or the anchor bolt body 2.

[0028] As Figure 1 、 Figure 2 and Figure 4 shown, a plurality of anti-slip protrusions 10 are provided on the bottom surface of the washer 9, a plurality of rotation grooves 11 are respectively opened on the left and right sides of the inner wall of the bottom-cutting cone head 1, a plurality of balls 12 are respectively rotatably arranged inside the plurality of rotation grooves 11, and the outer walls of the plurality of balls 12 are respectively in contact with the outer wall of the anchor bolt body 2.

[0029] In use, the anti-slip protrusions 10 of the washer 9 increase the friction force, ensuring that the washer 9 is not easily slid when pressure is applied, enhancing the locking effect of the nut 5, contributing to improving the firmness of the connection, and ensuring that it is not easily loosened during long-term use. When the anchor bolt body 2 rises, the rolling friction of the balls 12 reduces the friction force with the inner wall of the undercut cone head 1, enabling the anchor bolt body 2 to move upward smoothly, avoiding installation difficulties or damage caused by excessive frictional resistance, reducing the frictional resistance during the installation process, and improving the installation efficiency.

[0030] As Figure 1 , Figure 2 and Figure 4 shown, clamping holes 13 are respectively formed in the front side and the rear side of the inner wall of the undercut cone head 1, and the thickness of the washer 9 is 0.5 mm.

[0031] In use, the clamping holes 13 facilitate providing a convenient access point for the driving tool, enhancing the expandability and flexibility of the device. By setting the thickness of the washer 9 to 0.5 mm, it not only ensures sufficient buffering and anti-slip effects, but also avoids problems such as installation space limitations caused by excessive thickness or poor effects caused by too thin thickness.

[0032] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A penetrating self - undercut anchor bolt, comprising an undercut cone head (1), wherein the undercut cone head (1) is slidably sleeved on the anchor bolt body (2), and is characterized in that, The outer wall of the anchor bolt body (2) is provided with an external thread (3). The bottom end of the anchor bolt body (2) is fixed with a frustum part (4). The external thread (3) is threadedly connected with a nut (5). The bottom end of the undercut cone head (1) is fixed with a plurality of expansion pieces (6). Blades (7) are respectively arranged on the outer sides of the plurality of expansion pieces (6). Protrusions (8) are respectively fixed on the outer walls of the plurality of expansion pieces (6). The shapes of the plurality of protrusions (8) are all conical.

2. The through self-bottom-cutting anchor bolt according to claim 1, characterized in that: A washer (9) is arranged between the anchor bolt body (2) and the nut (5).

3. The through self-bottoming anchor bolt according to claim 2, characterized in that: A plurality of anti-slip protrusions (10) are arranged on the bottom surface of the washer (9).

4. The through - type self - drilling bottom - anchored bolt according to claim 3, characterized in that: A plurality of rotation grooves (11) are respectively formed in the left and right inner walls of the undercut cone head (1). A plurality of balls (12) are rotatably arranged in the plurality of rotation grooves (11). The outer walls of the plurality of balls (12) are respectively in contact with the outer wall of the anchor bolt body (2).

5. The penetrating self - bottom - cutting anchor bolt according to claim 4, characterized in that: Clamping holes (13) are respectively formed in the front and rear inner walls of the undercut cone head (1).

6. The penetrating self - bottom - cutting anchor bolt according to claim 2, characterized in that: The thickness of the washer (9) is 0.5 mm.

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