Heavy expansion bolt

Abstract

The utility model discloses a heavy expansion bolt which comprises a screw rod, an expansion pipe and a nut, the expansion pipe is sleeved on the screw rod, one end of the expansion pipe is an expansion end, the other end of the expansion pipe is a connecting end, at least two expansion notches are arranged at the expansion end of the expansion pipe, and one end of the screw rod is a conical expansion head matched with the expansion end of the expansion pipe. The other end of the screw is in threaded connection with a nut, a supporting plate is fixed to the connecting end of the expansion pipe, and an opening allowing the screw to penetrate through is formed in the center of the supporting plate. By arranging the supporting plate, one end face of the supporting plate is attached to the outer wall of the fixing body, the stress area of the outer wall of the fixing body is increased, and the installation stability is improved; the other end face of the supporting plate makes contact with the installation piece, the installation piece is prevented from making contact with the outer wall of the fixing body, the outer wall of the fixing body can be protected, and the outer wall of the fixing body is prevented from being damaged by pressing.

Description

Technical Field

[0001] This utility model relates to the field of expansion bolt technology, and in particular to a heavy-duty expansion bolt. Background Technology

[0002] Expansion bolts are special threaded fasteners used to fix pipe supports / hangers / brackets or equipment to walls, floors, or columns. They mainly consist of a bolt, expansion sleeve, washer, and nut. To use them, a hole of the appropriate size must first be drilled in the fixing body using an impact drill (hammer). Then, the bolt and expansion sleeve are inserted into the hole, and the nut is tightened to make the bolt, expansion sleeve, and mounting component tightly integrated with the fixing body.

[0003] Expansion bolts primarily bear the weight of the mounted components. The force is mainly transmitted to the drilled hole, i.e., the interior of the fixing body, through the expansion tube. A small portion of the force is also transmitted to the outer wall of the fixing body via washers. Because washers are generally annular with a small area, their contact area with the outer wall of the fixing body is small, resulting in a smaller force transmitted from the expansion bolt to the outer wall of the fixing body and a larger force transmitted from the expansion bolt to the interior of the fixing body.

[0004] If the fixing body is a concrete wall with a layer of soft insulation material on the outside, ordinary expansion bolts may not be secure during installation. If the fixing body is a hollow or soft wall, the expansion bolts will transfer most of the force to the inside of the fixing body, which can easily cause deformation of the drilled hole and affect the stability of the installation. Utility Model Content

[0005] Therefore, it is necessary to provide a heavy-duty expansion bolt to address the aforementioned technical problems.

[0006] To achieve the above objectives, this utility model provides a heavy-duty expansion bolt, comprising a screw, an expansion tube, and a nut. The expansion tube is fitted onto the screw, with one end being an expansion end and the other end being a connecting end. The expansion end of the expansion tube has at least two expansion slits. One end of the screw is a tapered expansion head that mates with the expansion end of the expansion tube, and the other end of the screw is threadedly connected to a nut. A support plate is fixed at the connecting end of the expansion tube, with an opening at the center of the support plate for the screw to pass through. The expansion tube is a variable-diameter circular tube, comprising a coarse-diameter section, a transition section, and a fine-diameter section connected in sequence. The diameter of the coarse-diameter section is larger than the diameter of the fine-diameter section. The end of the coarse-diameter section furthest from the transition section is the connecting end, and the end of the fine-diameter section furthest from the transition section is the expansion end.

[0007] Preferably, the expansion end of the expansion tube is provided with anti-slip texture.

[0008] Preferably, the expansion tube is a circular tube of equal diameter.

[0009] Preferably, the opening is circular, and the inner diameter of the opening is the same as the inner diameter of the expansion tube.

[0010] Preferably, the expansion tube is a variable diameter circular tube, which includes a large diameter section, a transition section and a small diameter section connected in sequence. The diameter of the large diameter section is larger than the diameter of the small diameter section. The end of the large diameter section away from the transition section is the connecting end, and the end of the small diameter section away from the transition section is the expansion end.

[0011] Preferably, the opening is circular, and the inner diameter of the opening is not greater than the inner diameter of the coarse diameter section.

[0012] Preferably, the inner diameter of the opening is smaller than the inner diameter of the coarse diameter section, and a reinforcing rib is fixed to the inner wall of the coarse diameter section, with one end of the reinforcing rib being fixedly connected to the support plate.

[0013] Preferably, at least two reinforcing ribs are provided, and the reinforcing ribs are distributed circumferentially on the inner wall of the rough diameter section.

[0014] Preferably, the support plate has connection ports that correspond one-to-one with the reinforcing ribs, the connection ports are connected to the openings, and one end of the reinforcing rib extends out of the expansion tube and is located inside the connection port.

[0015] Preferably, the portion of the reinforcing rib located within the connection port is welded to the support plate.

[0016] Compared with the prior art, this technical solution has at least one of the following beneficial effects: by setting a support plate, one end face of the support plate is made to fit against the outer wall of the fixed body, increasing the stress area of ​​the outer wall of the fixed body and improving the installation stability; the other end face of the support plate contacts the mounting component, avoiding the mounting component from contacting the outer wall of the fixed body, which can protect the outer wall of the fixed body and prevent damage to the outer wall of the fixed body. Attached Figure Description

[0017] Figure 1 This is a perspective view of Example 1;

[0018] Figure 2 This is a front view of Example 1;

[0019] Figure 3 for Figure 2 A sectional view along line AA.

[0020] Figure 4 This is a usage scenario diagram for Example 1;

[0021] Figure 5 This is a perspective view of Example 2;

[0022] Figure 6 This is a front view of Example 2;

[0023] Figure 7 for Figure 6 Sectional view along the BB line;

[0024] Figure 8 This is a front view of Example 3;

[0025] Figure 9 for Figure 8 A cross-sectional view along the CC line;

[0026] Figure 10 for Figure 8 A sectional view along the DD line;

[0027] Figure 11 This is a side view of the pallet;

[0028] In the diagram, 1 is the screw; 11 is the conical expansion head; 2 is the expansion tube; 21 is the expansion notch; 22 is the anti-slip texture; 23 is the coarse diameter section; 24 is the transition section; 25 is the fine diameter section; 3 is the nut; 4 is the support plate; 41 is the opening; 42 is the connection port; and 5 is the reinforcing rib. Detailed Implementation

[0029] 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. Example

[0030] Please see Figures 1 to 4 This application provides a heavy-duty expansion bolt, including a screw 1, an expansion tube 2, and a nut 3. The expansion tube 2 is fitted onto the screw 1, with one end being an expansion end and the other end being a connecting end. At least two expansion slits 21 are provided at the expansion end of the expansion tube 2. In this embodiment, four expansion slits 21 are provided, arranged circumferentially at the expansion end. One end of the screw 1 is a tapered expansion head 11 that mates with the expansion end of the expansion tube 2. The other end of the screw 1 is threadedly connected to the nut 3. A support plate 4 is fixed at the connecting end of the expansion tube 2. The support plate 4 is fixedly connected to the expansion tube 2 by welding. An opening 41 for the screw 1 to pass through is provided at the center of the support plate 4. By providing the support plate 4, when the expansion tube 2 is inserted into the drill hole, the support plate 4 can fit against the outer wall of the fixing body, increasing the contact area with the outer wall of the fixing body and increasing the compressive strength area compared to the washers of the prior art.

[0031] The expansion tube 2 has anti-slip grooves 22 at its expansion end. By setting the anti-slip grooves 22, the friction between the expansion end of the expansion tube 2 and the inner wall of the borehole is increased when the expansion end expands, thereby improving the installation stability.

[0032] Expansion tube 2 is a circular tube of equal diameter. The inner diameter of the drilled hole required for installation is adapted to the outer diameter of expansion tube 2, so that expansion tube 2 can be easily inserted into the drilled hole and make close contact with the drilled hole.

[0033] The opening 41 is a round opening, and the inner diameter of the opening 41 is the same as the inner diameter of the expansion tube 2. This makes it easy for the screw 1 to pass through, and at the same time, it ensures that the connecting end of the expansion tube 2 can contact the support plate 4, thus maximizing the contact area between the support plate 4 and the expansion tube 2.

[0034] In use, the expansion tube 2 is inserted into the drill hole of the fixing body, and the support plate 4 is made to fit against the outer wall of the fixing body, and the support plate 4 seals the drill hole; then the bolt is rotated, and the bolt drives the screw 1 to move out of the drill hole. The conical expansion head 11 squeezes the expansion end of the expansion tube 2, and the expansion end of the expansion tube 2 expands outward along the expansion cut 21 until it presses against the inner wall of the drill hole; then the nut 3 is removed, the mounting part is installed on the screw 1, and the nut 3 is installed on the screw 1, so that the nut 3 presses the mounting part on the support plate 4, thereby fixing the mounting part to the fixing body by the expansion bolt.

[0035] Please see Figure 4 The expansion bolts in this embodiment are suitable for installing dry-hanging stone on walls with thermal insulation material. The corresponding mounting component is a right-angle bracket. After installing the right-angle bracket onto the screw rod 1, the nut 3 is then installed onto the screw rod 1, so that the nut 3 presses the right-angle bracket onto the support plate 4. Then, the dry-hanging stone is installed on the right-angle bracket, which bears the weight of the dry-hanging stone. The right-angle bracket then transmits the force to the support plate 4 and the screw rod 1. The support plate 4 transmits the force to the wall surface, increasing the stress area of ​​the wall surface, improving installation stability, and preventing the right-angle bracket from damaging the thermal insulation material. Example

[0036] Please see Figures 5 to 7 This application provides a heavy-duty expansion bolt, which is largely the same as embodiment 1, except that:

[0037] The expansion tube 2 is not a uniform diameter circular tube, but a variable diameter circular tube. The expansion tube 2 includes a coarse diameter section 23, a transition section 24, and a fine diameter section 25 connected in sequence. The diameter of the coarse diameter section 23 is larger than the diameter of the fine diameter section 25. The end of the coarse diameter section 23 away from the transition section 24 is the connecting end, and the end of the fine diameter section 25 away from the transition section 24 is the expansion end. The inner diameter of the opening 41 is not larger than the inner diameter of the coarse diameter section 23, preferably the inner diameter of the opening 41 is smaller than the inner diameter of the coarse diameter section 23, which facilitates the passage of the screw 1 and ensures that the connecting end of the expansion tube 2 can contact the support plate 4, maximizing the contact area between the support plate 4 and the expansion tube 2.

[0038] The inner diameter of the drilled hole required for installation is matched with the outer diameter of the coarse-diameter section 23. This allows the expansion tube 2 to be easily inserted into the drilled hole, ensuring a tight contact between the outer wall of the coarse-diameter section 23 and the drilled hole. This achieves a tight connection between the expansion tube 2 and the drilled hole while reducing the material cost of the expansion tube 2. Example

[0039] Please see Figures 8 to 11 This application provides a heavy-duty expansion bolt. This application embodiment is largely the same as embodiment 2, except that, based on embodiment 2, this embodiment further provides a reinforcing rib 5 fixed to the inner wall of the coarse diameter section 23, and one end of the reinforcing rib 5 is fixedly connected to the support plate 4. The inner diameter of the opening 41 is approximately the same as the inner diameter of the fine diameter section, which allows the support plate 4 to have sufficient space to connect the reinforcing rib 5.

[0040] At least two reinforcing ribs 5 are provided. In this embodiment, four reinforcing ribs 5 are provided. The reinforcing ribs 5 are distributed in a circular pattern on the inner wall of the coarse diameter section 23.

[0041] To facilitate welding between the reinforcing rib 5 and the support plate 4, the support plate 4 is provided with a connection port 42 corresponding to the reinforcing rib 5. The connection port 42 communicates with the opening 41, and one end of the reinforcing rib 5 extends out of the expansion tube 2 and is located inside the connection port 42. The portion of the reinforcing rib 5 located inside the connection port 42 is welded to the support plate 4.

[0042] The reinforcing rib 5 is fixed to the inner wall of the coarse diameter section 23 by welding, ensuring that one end of the reinforcing rib 5 extends out of the expansion tube 2 during welding, so that the extended part of the reinforcing rib 5 can be located in the connection port 42 of the support plate 4; the extended part of the reinforcing rib 5 should be less than the thickness of the support plate 4, or the cross-sectional dimension of the connection port 42 should be larger than the cross-section of the reinforcing rib 5, so as to leave a welding area; after the reinforcing rib 5 is welded, the connection end of the support plate 4 and the expansion tube 2 is abutted, and the connection port 42 is locked on the extended part of the reinforcing rib 5; then the reinforcing rib 5 and the support plate 4 are welded together at the connection port 42; by setting the reinforcing rib 5, the connection stability between the expansion tube 2 and the support plate 4 can be increased, and the overall strength of the expansion bolt can be increased.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 heavy-duty expansion bolt, comprising a screw (1), an expansion tube (2), and a nut (3), wherein the expansion tube (2) is fitted onto the screw (1), one end of the expansion tube (2) is an expansion end, and the other end is a connecting end, the expansion end of the expansion tube (2) is provided with at least two expansion slits (21), one end of the screw (1) is a tapered expansion head (11) that mates with the expansion end of the expansion tube (2), and the other end of the screw (1) is threadedly connected to the nut (3), characterized in that, The expansion tube (2) is fixed with a support plate (4) at the connection end. The support plate (4) has an opening (41) at the center for the screw (1) to pass through. The expansion tube (2) is a variable diameter round tube. The expansion tube (2) includes a large diameter section (23), a transition section (24) and a small diameter section (25) connected in sequence. The diameter of the large diameter section (23) is larger than the diameter of the small diameter section (25).

2. The heavy-duty expansion bolt according to claim 1, characterized in that, The expansion end of the expansion tube (2) is provided with anti-slip texture (22).

3. The heavy-duty expansion bolt according to claim 1 or 2, characterized in that, The opening (41) is a circular opening, and the inner diameter of the opening (41) is not greater than the inner diameter of the coarse diameter section (23).

4. The heavy-duty expansion bolt according to claim 3, characterized in that, The inner diameter of the opening (41) is smaller than the inner diameter of the coarse diameter section (23). The inner wall of the coarse diameter section (23) is fixed with a reinforcing rib (5), which is fixedly connected to the support plate (4).

5. The heavy-duty expansion bolt according to claim 4, characterized in that, At least two reinforcing ribs (5) are provided, and the reinforcing ribs (5) are distributed circumferentially on the inner wall of the coarse diameter section (23).

6. The heavy-duty expansion bolt according to claim 5, characterized in that, The tray (4) has a connection port (42) corresponding to the reinforcing rib (5). The connection port (42) is connected to the opening (41). One end of the reinforcing rib (5) extends out of the expansion tube (2) and is located inside the connection port (42).

7. The heavy-duty expansion bolt according to claim 6, characterized in that, The portion of the reinforcing rib (5) located within the connection port (42) is welded to the support plate (4).

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