Multi-point supporting expansion bolt

Abstract

The utility model relates to the technical field of expansion bolts, in particular to a multi-point supporting expansion bolt which comprises a supporting pipe, a first thread groove is formed in the outer wall of the supporting pipe, a conical bearing seat is coaxially installed at one end of the supporting pipe, and the narrow opening end of the bearing seat is fixed to the supporting pipe. An inclined tangent plane is formed along the edge of one end, far away from the supporting pipe, of the bearing seat; the supporting pipe is sleeved with an expansion pipe, a plurality of strip-shaped grooves are formed in the end, close to the bearing base, of the expansion pipe, the length direction of the strip-shaped grooves is arranged in the axis direction of the expansion pipe, and a nut is arranged at the other end of the expansion pipe. When the multi-point supporting expansion bolt is used, after the expansion bolt gets close to the bearing seat through the skirt edge and then expands outwards to generate deformation, an additional blocking piece can be formed on the edge of the bearing seat, so that an expansion pipe can be limited and supported by the skirt edge after being in contact with the bearing seat, and the expansion pipe can be earlier arched and expanded outwards within a limited moving distance; and more fulcrums are formed between the expansion tube and the hole wall.

Description

Technical Field

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

[0002] An expansion bolt is a special threaded fastener used to secure pipe supports / hangers / brackets or equipment to walls, floors, or columns. It consists of a countersunk bolt, expansion sleeve, flat washer, spring washer, and hexagonal nut.

[0003] Existing expansion bolts, when used, allow the countersunk head of the bolt to move towards the nut with a secondary rotation of the nut. This allows the countersunk head to press against the expansion tube, causing the expansion tube to arch outward and expand, filling the entire mounting hole. However, because the surface of the countersunk head is mostly beveled, the expansion tube initially deflects outward upon contact with the countersunk head. This prevents the front section of the expansion tube from directly arching; it only expands properly after contacting the wall of the mounting hole where the expansion bolt is placed. This significantly wastes the length of the expansion tube and limits the size of the mounting hole that can be drilled. To address these issues, we propose a multi-point support expansion bolt. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a multi-point support expansion bolt.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a multi-point support expansion bolt is designed, including a support tube, a first threaded groove is provided on the outer wall of the support tube, a tapered bearing seat is coaxially installed at one end of the support tube, the narrow end of the bearing seat is fixed to the support tube, and an inclined cut surface is provided along the edge of the bearing seat away from the support tube.

[0006] An expansion tube is fitted onto the support tube. Multiple strip grooves are provided at one end of the expansion tube near the bearing seat. The length direction of the strip grooves is set along the axis of the expansion tube. A nut is provided at the other end of the expansion tube, and the nut corresponds to the first threaded groove.

[0007] Inside the support tube, there is a coaxial connecting rod with a second threaded groove. A turntable is threadedly connected to the second threaded groove on the connecting rod and fixed to the inner wall of the support tube. A connecting plate is coaxially installed on the end of the connecting rod near the bearing seat. A skirt is vertically installed along the edge of the connecting plate near the connecting rod, and the skirt corresponds to the tangential surface.

[0008] Preferably, a reinforcing seat is installed on the side of the connecting plate near the skirt edge, the outer wall of the reinforcing seat is fixed to the skirt edge, and several slots are opened on the skirt edge, with the slots corresponding to the strip grooves.

[0009] Preferably, the end of the connecting rod away from the connecting plate is connected to a screw head, and an insertion hole is provided on the screw head, with the insertion hole arranged in the radial direction of the connecting rod.

[0010] Preferably, at least two second threaded grooves are provided on the connecting rod, and a turntable is threadedly connected to each second threaded groove.

[0011] Preferably, an annular plate is provided between the nut and the expansion tube, and the annular plate is sleeved on the support tube.

[0012] Preferably, a washer is provided between the annular plate and the nut.

[0013] Preferably, an arc-shaped guide groove is provided on the inner wall of the end of the expansion tube near the bearing seat.

[0014] The design scheme proposed in this utility model has the following beneficial effects in application:

[0015] 1. After the expansion bolt with multi-point support approaches the bearing seat through the skirt and deforms outward, it can form an additional stop at the edge of the bearing seat. This allows the expansion tube to be limited and supported by the skirt after contacting the bearing seat, enabling it to arch outward and expand earlier within a more limited movement distance, thus creating more support points between the expansion tube and the hole wall.

[0016] 2. The expansion bolts with multi-point support improve the support strength after the skirt deforms by setting up the reinforcing seat, so that the skirt can provide sufficient stress to the expansion tube. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a side view of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the support tube of this utility model;

[0020] Figure 4 This is a schematic diagram of the expansion tube structure of this utility model.

[0021] In the diagram: 1. Support tube; 2. Bearing seat; 3. Expansion tube; 4. Strip groove; 5. Nut; 6. Annular plate; 7. Connecting rod; 8. Second threaded groove; 9. Turntable; 10. Connecting plate; 11. Skirt; 12. Screw head; 13. Insertion hole; 14. First threaded groove; 15. Washer; 16. Cross-section; 17. Reinforcing seat; 18. Groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figures 1-4 A multi-point supported expansion bolt includes a support tube 1, a first threaded groove 14 is provided on the outer wall of the support tube 1, a tapered bearing seat 2 is coaxially installed at one end of the support tube 1, the narrow end of the bearing seat 2 is fixed to the support tube 1, and an inclined cut surface 16 is provided along the edge of the bearing seat 2 away from the support tube 1.

[0024] Specifically, after placing the support tube 1 into the mounting hole of the expansion bolt, as follows: Figure 1 and Figure 2 As shown, a coaxial connecting rod 7 is located inside the support tube 1. A second threaded groove 8 is provided on the connecting rod 7. A turntable 9 is provided on the connecting rod 7 and threadedly connected to the second threaded groove 8. The turntable 9 is fixed to the inner wall of the support tube 1. A connecting plate 10 is coaxially installed on the end of the connecting rod 7 near the bearing seat 2. A skirt 11 is vertically installed along the edge of the connecting plate 10 near the connecting rod 7. The skirt 11 corresponds to the cut surface 16 and can fix the support tube 1 and rotate the connecting rod 7. In order to make the rotation of the connecting rod 7 easier, a screw head 12 is connected to the end of the connecting rod 7 away from the connecting plate 10. An insertion hole 13 is provided on the screw head 12. The insertion hole 13 is set along the radial direction of the connecting rod 7. As the skirt 11 approaches the bearing seat 2, the skirt 11 will extend and deform outward under the pressure of the cut surface 16 of the bearing seat 2 until the skirt 11 abuts against the inner wall of the mounting hole or moves to the maximum distance.

[0025] Furthermore, several slots 18 are provided on the skirt 11, and the slots 18 correspond to the strip grooves 4, so that the deformation of the skirt 11 after contacting the bearing seat 2 is more effortless.

[0026] After that, as Figure 1 and Figure 4As shown, an expansion tube 3 is fitted onto the support tube 1. Multiple strip grooves 4 are formed at one end of the expansion tube 3 near the bearing seat 2. The length direction of the strip grooves 4 is along the axis of the expansion tube 3. A nut 5 is provided at the other end of the expansion tube 3. The nut 5 corresponds to the first threaded groove 14. Tightening the nut 5 brings it closer to the expansion tube 3, causing the end of the expansion tube 3 to contact the bearing seat 2 and begin to expand outwards along the bearing seat 2 until the end of the expansion tube 3 contacts the skirt 11. To allow the expansion tube 3 to be better acted upon by the bearing seat 2, multiple strip grooves 4 are formed at one end of the expansion tube 3 near the bearing seat 2. An arc-shaped guide groove is provided on the inner wall of one end of the bearing seat 2. At this time, the skirt 11 will form a groove with the bearing seat 2 due to its own deflection, so that the end of the expansion tube 3 will be placed in the groove, thereby forming a limiting support for the expansion tube 3. The nut 5 will squeeze the expansion tube 3 again, causing the middle part of the expansion tube 3 to start to arch outward and press against the inner wall of the mounting hole, forming an expansion effect. In this way, the expansion tube 3 can achieve a greater arching expansion effect within a smaller movement distance, and more support points are formed between the expansion tube 3 and the mounting hole.

[0027] Furthermore, in order to improve the support strength of the skirt 11 to the expansion tube 3, a reinforcing seat 17 is installed on the side of the connecting plate 10 near the skirt 11, and the outer wall of the reinforcing seat 17 is fixed to the skirt 11.

[0028] It should be noted that, in order to achieve a more stable movement effect for the connecting rod 7, at least two second threaded grooves 8 are provided on the connecting rod 7, and a turntable 9 is threadedly connected to each second threaded groove 8.

[0029] Specifically, an annular plate 6 is provided between the nut 5 and the expansion tube 3. The annular plate 6 is sleeved on the support tube 1 to limit the end of the expansion tube 3 near the nut 5, allowing the expansion tube 3 to move fully towards the bearing seat 2. A washer 15 is provided between the annular plate 6 and the nut 5 to improve the contact effect between the annular plate 6 and the nut 5, as well as the stability of the nut 5 on the support tube 1.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-point supported expansion bolt, characterised in that: Includes a support tube (1), a first threaded groove (14) is provided on the outer wall of the support tube (1), a tapered bearing seat (2) is coaxially installed at one end of the support tube (1), the narrow end of the bearing seat (2) is fixed to the support tube (1), and an inclined cut surface (16) is provided along the edge of the bearing seat (2) away from the support tube (1). An expansion tube (3) is fitted onto the support tube (1). Multiple strip grooves (4) are provided at one end of the expansion tube (3) near the bearing seat (2). The length direction of the strip grooves (4) is set along the axis of the expansion tube (3). A nut (5) is provided at the other end of the expansion tube (3). The nut (5) corresponds to the first threaded groove (14). Inside the support tube (1), there is a coaxial connecting rod (7), and a second threaded groove (8) is provided on the connecting rod (7). A turntable (9) is provided on the connecting rod (7) and threadedly connected to the second threaded groove (8). The turntable (9) is fixed to the inner wall of the support tube (1). A connecting plate (10) is coaxially installed on one end of the connecting rod (7) near the bearing seat (2). A skirt (11) is vertically installed along the edge of the connecting plate (10) near the connecting rod (7). The skirt (11) corresponds to the cut surface (16).

2. A multi-point supported expansion bolt according to claim 1, wherein: A reinforcing seat (17) is installed on the side of the connecting plate (10) near the skirt (11). The outer wall of the reinforcing seat (17) is fixed to the skirt (11), and several slots (18) are opened on the skirt (11), and the slots (18) correspond to the strip grooves (4).

3. A multi-point supported expansion bolt according to claim 1, wherein: A screw head (12) is connected to one end of the connecting rod (7) away from the connecting plate (10). A socket (13) is provided on the screw head (12), and the socket (13) is set in the radial direction of the connecting rod (7).

4. A multi-point supported expansion bolt according to claim 1, wherein: At least two second threaded grooves (8) are opened on the connecting rod (7), and a turntable (9) is threadedly connected to each second threaded groove (8).

5. A multi-point supported expansion bolt according to claim 1, wherein: An annular plate (6) is provided between the nut (5) and the expansion tube (3), and the annular plate (6) is sleeved on the support tube (1).

6. A multi-point supported expansion bolt according to claim 5 wherein: A washer (15) is provided between the annular plate (6) and the nut (5).

7. A multi-point supported expansion bolt according to claim 1 wherein: An arc-shaped guide groove is provided on the inner wall of the end of the expansion tube (3) near the bearing seat (2).

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