Anti-falling reinforced expansion bolt

Abstract

The utility model discloses an anti -drop reinforced expansion bolt relates to expansion bolt technical field, including screw rod, nut and expansion sleeve, and the expansion sleeve is sleeved on the screw rod, and the nut is connected with the screw rod thread, and the screw rod one end is equipped with the taper head portion of the pyramid type, and the expansion sleeve includes expansion part and taper thickening part, and the expansion part is equipped with expansion groove, and the expansion groove divides the expansion part into at least two petal pieces, and the taper head portion and petal piece extrude the cooperation to make petal piece deformation outward expansion, and the taper thickening part gradually increases the outer diameter from the one end close to the expansion part to the one end away from the expansion part. The taper thickening part and the petal piece that extrude petal piece through the taper head portion make the petal piece that deforms outward expansion abut with the borehole inner wall simultaneously, guarantee the stability of expansion sleeve in the borehole, prevent the expansion sleeve from falling off, and convenient to dismantle simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of expansion bolt technology, and in particular to a reinforced expansion bolt designed to prevent loosening. Background Technology

[0002] In existing expansion bolts, the diameter of the expansion sleeve is matched to the drilled hole, and after installation, the expansion sleeve fits tightly against the inner wall of the drilled hole to achieve fixation. However, when disassembly is required, this structure is difficult to disassemble due to the tight connection between the expansion sleeve and the inner wall of the drilled hole, and the large contact area, which brings inconvenience to actual use. Utility Model Content

[0003] Therefore, it is necessary to provide a reinforced expansion bolt that prevents loosening, in order to address the aforementioned technical problems.

[0004] To achieve the above objectives, this utility model provides a reinforced expansion bolt for preventing detachment, comprising a screw, a nut, and an expansion sleeve. The expansion sleeve is fitted onto the screw, and the nut is threadedly connected to the screw. One end of the screw has a truncated cone head. The expansion sleeve includes an expansion portion and a conical thickened portion. An expansion groove is provided on the expansion portion, which divides the expansion portion into at least two lobes. The cone head is pressed and fitted with the lobes to cause the lobes to deform and expand outward. The outer diameter of the conical thickened portion gradually increases from the end near the expansion portion to the end away from the expansion portion.

[0005] Optionally, a groove is formed on the outer surface of the tapered thickened portion. During installation, the groove abuts against the inner wall of the borehole, effectively restricting the rotation of the tapered thickened portion and preventing the screw and expansion sleeve from rotating along with it, thus improving installation efficiency and stability.

[0006] Optionally, the slots are circumferentially distributed on the outer surface of the tapered thickened portion along its axis. The circumferentially distributed slots ensure a more uniform effect in restricting rotation, preventing rotation of the tapered thickened portion from all directions, further guaranteeing smooth installation and overall structural stability.

[0007] Optionally, the thickness of the tapered thickened portion gradually increases from the end near the expansion portion to the end away from the expansion portion. This design enhances the strength of the expansion sleeve, effectively improving its overall resistance to pressure and deformation, and extending its service life.

[0008] Optionally, the maximum distance from the bottom of the slot to the axis of the conical thickened portion is not less than the radius of the expansion portion.

[0009] Optionally, the maximum diameter of the tapered thickened portion is greater than the maximum diameter of the tapered head.

[0010] Optionally, the maximum diameter of the tapered thickened portion is equal to the maximum diameter of the tapered head.

[0011] Optionally, the expansion sleeve further includes a baffle portion located at the end of the tapered thickened portion away from the expansion portion. The maximum distance from the edge of the baffle portion to the centerline of the expansion sleeve is greater than the maximum radius of the tapered thickened portion. The baffle portion provides additional blocking support from outside the borehole, preventing the expansion sleeve from completely entering the borehole and facilitating its removal from the borehole. The baffle portion also increases the contact area between the nut and the expansion sleeve.

[0012] Optionally, the expansion section and the baffle section are located at both ends of the expansion sleeve. Since the baffle section cannot enter the borehole, placing the baffle section at the end of the expansion sleeve can save expansion sleeve material and avoid waste caused by an excessively long expansion sleeve.

[0013] Optionally, a gasket is also included, which is fitted onto the threaded portion and positioned between the expansion sleeve and the nut. The gasket increases the contact area between the nut and the expansion sleeve, distributes pressure, prevents damage to the expansion sleeve when the nut is tightened, and makes the connection tighter and more secure.

[0014] The beneficial effects of this technical solution are: the conical thickened part and the flap that expands outward by being squeezed by the conical head simultaneously abut against the inner wall of the borehole, ensuring the stability of the expansion sleeve in the borehole, preventing the expansion sleeve from falling off, and facilitating disassembly. Attached Figure Description

[0015] Figure 1 This is an exploded view of the anti-loosening reinforced expansion bolt according to an embodiment of the present utility model; Figure 2 This is a perspective view of the anti-loosening reinforced expansion bolt according to an embodiment of the present utility model; Figure 3 This is a cross-sectional view of the anti-loosening reinforced expansion bolt according to an embodiment of the present utility model; In the figure, 1 is the screw; 11 is the conical head; 2 is the nut; 3 is the expansion sleeve; 31 is the expansion part; 311 is the expansion groove; 312 is the flap; 32 is the conical thickened part; 321 is the slot; 33 is the baffle part; and 4 is the gasket. Detailed Implementation

[0016] 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.

[0017] Please see Figures 1 to 3This application provides an anti-loosening reinforced expansion bolt, including a screw 1, a nut 2, an expansion sleeve 3, and a washer 4.

[0018] The expansion sleeve 3 is fitted onto the screw 1, the screw 1 has an external thread, the nut 2 is threadedly connected to the screw 1, the washer 4 is fitted onto the screw 1, the washer 4 is located between the expansion sleeve 3 and the nut 2, and one end of the screw 1 has a cone head 11 in the shape of a frustum.

[0019] The expansion sleeve 3 includes an expansion section 31 and a conical thickened section 32. The expansion section 31 has four expansion grooves 311, which divide the expansion section 31 into four lobes 312. The conical head 11 is pressed and engaged with the lobes 312 to deform and expand the lobes 312 outward.

[0020] The outer diameter of the tapered thickened portion 32 gradually increases from the end near the expansion portion 31 to the end away from the expansion portion 31. This makes the maximum outer diameter of the tapered thickened portion 32 larger than the outer diameter of the expansion portion 31, which facilitates direct contact between the tapered thickened portion 32 and the inner wall of the borehole when the expansion sleeve 3 is inserted into the borehole. The expansion portion 31 does not contact the inner wall of the borehole when it is inserted into the borehole. It only comes into contact with the inner wall of the borehole when the tapered head 11 squeezes the flap 312, causing the flap 312 to deform and expand outward.

[0021] In this embodiment, the maximum diameter of the tapered thickened portion 32 is greater than the maximum diameter of the tapered head 11. This ensures that when the inner diameter of the drill hole is the same as the maximum diameter of the tapered thickened portion 32, the expansion bolt can be smoothly inserted into the drill hole. In other embodiments, the maximum diameter of the tapered thickened portion 32 can be equal to the maximum diameter of the tapered head 11, but the inner diameter of the drill hole needs to be slightly smaller than the maximum diameter of the tapered thickened portion 32, and greater than or equal to the maximum diameter of the tapered head 11, to facilitate the smooth insertion of the expansion bolt into the drill hole.

[0022] In this embodiment, the maximum diameter of the tapered thickened portion 32 is 12 mm, the maximum diameter of the tapered head 11 is 11.5 mm, and the diameter of the expansion portion 31 is 10 mm.

[0023] During installation, a 12mm diameter hole is drilled, and the expansion bolt is inserted into the hole, so that the tapered thickened part 32 abuts against the inner wall of the hole. The nut 2 is rotated, moving along the threaded rod, which in turn moves the screw 1 towards the nut 2. The tapered head 11 presses against the expansion part 31, causing the flaps 312 to expand outwards and press tightly against the inner wall of the hole. In this way, the expansion parts 31 and the tapered thickened parts 32 at both ends of the expansion sleeve 3 are pressed tightly against the inner wall of the hole, ensuring the stability of the expansion sleeve 3 within the hole and preventing it from falling off. Furthermore, the total area of ​​the expansion parts 31 and the tapered thickened parts 32 in contact with the inner wall of the hole is small, facilitating disassembly while maintaining stability. During disassembly, first unscrew nut 2, then push screw 1 in the direction of drilling depth so that the cone head 11 moves away from the expansion part 31. The flap 312 loses the support of the cone head 11 and no longer presses against the inner wall of the drill hole. At this time, the expansion sleeve 3 can be easily removed from the drill hole by pulling the expansion sleeve 3 outward through the baffle part 33.

[0024] In some embodiments, please refer to Figures 1 to 3 To prevent the expansion sleeve 3 from rotating, a groove 321 is provided on the outer surface of the tapered thickened part 32. The groove 321 is distributed circumferentially on the outer surface of the tapered thickened part 32 along the axis of the tapered thickened part 32.

[0025] After the tapered thickened part 32 is inserted into the drill hole, the slot 321 abuts against the inner wall of the drill hole, which can restrict the rotation of the tapered thickened part 32. This ensures that the screw 1 and the expansion sleeve 3 do not rotate during the installation process, making the installation easy and ensuring good overall structural stability after installation.

[0026] Furthermore, the thickness of the tapered thickened portion 32 gradually increases from the end near the expansion portion 31 to the end away from the expansion portion 31. This increases the strength of the expansion sleeve 3.

[0027] Furthermore, the maximum distance between the bottom of the slot 321 and the axis of the conical thickened portion 32 is not less than the radius of the expansion portion 31. This ensures that the thickness of the thinnest part of the conical thickened portion 32 is not less than the thickness of the expansion portion 31, thus guaranteeing the overall strength of the conical thickened portion 32.

[0028] In some embodiments, please refer to Figures 1 to 3 To facilitate the removal of the expansion sleeve 3, the expansion sleeve 3 also includes a baffle portion 33, which is located at the end of the tapered thickened portion 32 away from the expansion portion 31. The expansion portion 31 and the baffle portion 33 are located at opposite ends of the expansion sleeve 3. Furthermore, the maximum distance from the edge of the baffle portion 33 to the centerline of the expansion sleeve 3 is greater than the maximum radius of the tapered thickened portion 32, such that at least a portion of the baffle portion 33 extends radially outward from the tapered thickened portion 32.

[0029] In this embodiment, the baffle portion 33 is annular. The outer diameter of the baffle portion 33 is larger than the maximum outer diameter of the tapered thickened portion 32.

[0030] Since the outer diameter of the baffle part 33 is larger than that of the drill hole, after the expansion bolt is installed, the baffle part 33 is located outside the drill hole, which makes it easy to pull the expansion sleeve 3 out of the drill hole through the baffle part 33.

[0031] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0032] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. 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.

[0033] 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.

[0034] 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.

[0035] 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. A reinforced expansion bolt for preventing detachment, comprising a screw (1), a nut (2), and an expansion sleeve (3), wherein the expansion sleeve (3) is fitted onto the screw (1), the nut (2) is threadedly connected to the screw (1), and one end of the screw (1) is provided with a frustum-shaped conical head (11), characterized in that, The expansion sleeve (3) includes an expansion part (31) and a conical thickened part (32). An expansion groove (311) is provided on the expansion part (31). The expansion groove (311) divides the expansion part (31) into at least two lobes (312). The conical head (11) is squeezed and fitted with the lobes (312) to deform and expand the lobes (312). The outer diameter of the conical thickened part (32) gradually increases from the end near the expansion part (31) to the end away from the expansion part (31).

2. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, A slot (321) is provided on the outer surface of the tapered thickened part (32).

3. The anti-loosening reinforced expansion bolt according to claim 2, characterized in that, The slots (321) are distributed circumferentially on the outer surface of the tapered thickened portion (32) along the axis of the tapered thickened portion (32).

4. The anti-loosening reinforced expansion bolt according to claim 2, characterized in that, The thickness of the tapered thickened portion (32) gradually increases from the end near the expansion portion (31) to the end away from the expansion portion (31).

5. The anti-loosening reinforced expansion bolt according to claim 4, characterized in that, The maximum distance between the bottom of the slot (321) and the axis of the conical thickened part (32) is not less than the radius of the expansion part (31).

6. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, The maximum diameter of the tapered thickened portion (32) is greater than the maximum diameter of the tapered head (11).

7. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, The maximum diameter of the tapered thickened portion (32) is equal to the maximum diameter of the tapered head (11).

8. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, The expansion sleeve (3) also includes a baffle portion (33), which is located at the end of the tapered thickened portion (32) away from the expansion portion (31). The maximum distance between the edge of the baffle portion (33) and the center line of the expansion sleeve (3) is greater than the maximum radius of the tapered thickened portion (32).

9. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, The expansion portion (31) and the baffle portion (33) are located at both ends of the expansion sleeve (3).

10. The anti-loosening reinforced expansion bolt according to claim 1, characterized in that, It also includes a gasket (4), which is fitted onto the screw (1) and is located between the expansion sleeve (3) and the nut (2).

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