Knocking type expansion bolt

Abstract

The invention discloses a knocking type expansion bolt which comprises an expansion pipe and is characterized in that an expansion body is arranged in the expansion pipe, and an expansion nail capable of enabling the expansion body to extrude the expansion pipe when the end part of the expansion pipe is knocked is arranged in the expansion body. The device is simple in structure, the screw does not need to be turned, only the front end of the expansion pipe needs to be knocked, the expansion nail moves towards the interior of the expansion body under the action of axial impact force, the rear end of the expansion nail forces the expansion body to expand in the radial direction, and therefore the expansion pipe is extruded open and tightly attached to the wall of a mounting hole, and firm anchoring is achieved. Operation is easy and convenient, and construction efficiency can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion bolts, and particularly to a percussion expansion bolt. Background Art

[0002] The expansion type anchor bolt, simply referred to as an expansion bolt, is a component that utilizes the relative movement between a cone and an expansion piece (or an expansion sleeve) to cause the expansion piece to expand, generate an expansion extrusion force with the concrete of the hole wall, and generate a pulling resistance through the shear friction effect to achieve the anchoring of the connected component.

[0003] During use, it is necessary to first drill a hole of corresponding size in the fixed body with a percussion electric drill (hammer), then insert the bolt and the expansion tube into the hole, and tighten the nut to make the bolt, the expansion tube, the installation part and the fixed body expand and become an integral body. It will expand after tightening. There is a large head at the tail of the bolt, and a round tube slightly larger than the diameter of the bolt is sleeved outside the bolt. There are several openings at the tail part. When the bolt is tightened, the tail of the large head is brought into the open tube, flushing the tube to expand, achieving the purpose of expansion, and then generating frictional force with the hole wall to achieve fixation.

[0004] The disadvantages of the existing expansion bolt are as follows: in the application of construction projects, it sometimes appears to have cumbersome steps, and some small components are also prone to loss (such as gaskets).

[0005] Therefore, the existing expansion bolts need to be further improved. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a percussion expansion bolt with a simple structure, without the need to screw, and easy to operate.

[0007] To achieve the above purpose, the present invention adopts the following scheme: a percussion expansion bolt, including an expansion tube, characterized in that: an expansion body is arranged in the expansion tube, and an expansion nail is arranged in the expansion body, which can cause the expansion body to squeeze open the expansion tube when the end of the expansion tube is struck.

[0008] As another improvement of the percussion expansion bolt of the present invention, the expansion tube includes a cylindrical body part, a cylindrical body end is provided at the front end of the cylindrical body part, and a plurality of expansion pieces that can open relative to the cylindrical body part are arranged at intervals at the rear end of the cylindrical body part.

[0009] As another improvement of the percussion expansion bolt of the present invention, the expansion body includes an expansion seat, an expansion body end is provided at the front end of the expansion seat, and a number of extrusion columns equivalent to the number of expansion pieces are arranged at intervals at the rear end of the expansion seat.

[0010] As another improvement of the percussion expansion bolt of the present invention, continuous positioning grooves are provided on the cylinder part and the expansion pieces, and positioning convex parts are provided at positions corresponding to the positioning grooves on the extrusion column, and the positioning convex parts are arranged in the positioning grooves.

[0011] As another improvement of the percussion expansion bolt of the present invention, the expansion nail includes a nail body, a connecting part with a diameter smaller than that of the nail body is provided at the front end of the nail body, a central relief hole is provided at the rear end of the expansion seat, the connecting part is movably arranged in the central relief hole, and an extrusion head capable of pushing open the extrusion column is provided at the rear end of the nail body.

[0012] As another improvement of the percussion expansion bolt of the present invention, the extrusion column is a square rod, one edge of the square rod is arranged in the positioning groove, and an arc-shaped inclined surface is provided on the surface of the square rod opposite to the edge.

[0013] As another improvement of the percussion expansion bolt of the present invention, a positioning concave platform is provided inside the front end of the cylinder part, and the end of the expansion body is arranged on the positioning concave platform.

[0014] As another improvement of the percussion expansion bolt of the present invention, a first marking line is provided on the end of the cylinder body, and a second marking line is provided at a position corresponding to the first marking line on the end of the expansion body.

[0015] As another improvement of the percussion expansion bolt of the present invention, a plurality of the extrusion columns are arranged to be open from the front end to the rear end.

[0016] As another improvement of the percussion expansion bolt of the present invention, a plurality of the expansion pieces are arranged to be open from the front end to the rear end.

[0017] To sum up, the beneficial effects of the present invention compared with the prior art are as follows: The structure of the present invention is simple, there is no need to screw, only need to strike the front end of the expansion tube, so that the expansion nail moves into the expansion body under the action of the axial impact force, and the rear end of the expansion nail forces the expansion body to expand radially, thereby pushing open the expansion tube and making it closely fit with the wall of the installation hole, so as to achieve firm anchoring. The operation is simple and can greatly improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is one of the three-dimensional schematic diagrams of the present invention.

[0019] Figure 2 is the second three-dimensional schematic diagram of the present invention.

[0020] Figure 3 is the exploded schematic diagram of the present invention.

[0021] Figure 4 is the front view of the rear end of the present invention.

[0022] Figure 5 This is a three-dimensional schematic diagram of the expansion body of the present invention.

[0023] Figure 6 This is a front view of the rear end of the expansion body of the present invention.

[0024] Figure 7 This is a three-dimensional schematic diagram of the expansion tube of the present invention.

[0025] Figure 8 This is a front view of the rear end of the expansion tube of the present invention.

[0026] In the figure: 1. Expansion tube; 11. Cylindrical part; 12. Cylindrical end; 13. Expansion piece; 2. Expansion body; 21. Expansion seat; 22. Expansion body end; 23. Extrusion column; 3. Expansion nail; 31. Nail body; 32. Connection part; 33. Central relief hole; 34. Extrusion head; 4. Positioning groove; 5. Positioning convex part; 6. Arc-shaped inclined surface; 7. Positioning concave platform; 8. First marking line; 9. Second marking line. Detailed implementation manners

[0027] The following further elaborates on the above and other technical features and advantages of the present invention with reference to the accompanying drawings.

[0028] The following describes the preferred implementation manners of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0029] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the accompanying drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0030] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0031] As Figure 1-8As shown in the figure, a percussion expansion bolt includes an expansion tube 1. An expansion body 2 is arranged inside the expansion tube 1, and an expansion nail 3 is arranged inside the expansion body 2. When the end of the expansion tube 1 is struck, the expansion nail 3 can cause the expansion body 2 to squeeze open the expansion tube 1. In the present invention, the expansion tube 1, the expansion body 2, and the expansion nail 3 are coaxially arranged. The expansion body 2 is an elastic structure that can expand radially; when the front end of the expansion tube 1 is struck, the expansion nail 3 moves inward into the expansion body 2 under the action of an axial impact force, and the rear end of the expansion nail 3 forces the expansion body 2 to expand radially, thereby squeezing open the expansion tube 1 and making it fit tightly against the wall of the installation hole, achieving firm anchoring.

[0032] In one embodiment of the present invention, anti-slip patterns or protruding structures are provided on the outer surface of the expansion tube 1 to enhance the friction with the base material, thereby improving the firmness of the anchoring.

[0033] In the present invention, the expansion body 2 is made of metal or high-strength engineering plastic and has sufficient elastic deformation ability to ensure that the expansion tube 1 can be effectively expanded under the action of the expansion nail 3.

[0034] The percussion expansion bolt of the present invention has a simple structure and is convenient to install. Only percussion is required to complete the anchoring. It is applicable to various base materials such as concrete and brick walls and has high bearing capacity and stability.

[0035] The expansion tube 1 of the present invention includes a cylindrical body part 11. The cylindrical body part 11 is a cylindrical hollow structure, and the end of the cylinder 12 is in a circular ring shape; a cylinder end 12 is provided at the front end of the cylindrical body part 11, and a plurality of expansion pieces 13 that can open relative to the cylindrical body part 11 are arranged at intervals at the rear end of the cylindrical body part 11. The expansion pieces 13 are integrally formed with the cylindrical body part 11 or connected by an elastic connection structure, and there are gaps between the expansion pieces 13 so that they can expand radially relative to the cylindrical body part 11 under the action of an external force. Anti-slip patterns, tooth-like structures, or protrusions can be provided on the outer surface of the expansion pieces 13 to enhance the friction with the wall of the base material hole and the anchoring effect.

[0036] A transition chamfer or a reinforcing rib 121 can be provided between the cylinder end 12 and the cylindrical body part 11 of the present invention to improve the structural strength and prevent deformation during installation.

[0037] The number of the expansion pieces 13 of the present invention is 3 to 6, preferably 4, to ensure uniform stress and a stable expansion effect.

[0038] The expansion body 2 of the present invention includes an expansion seat 21, and the expansion seat 21 is cylindrical; an expansion body end 22 is provided at the front end of the expansion seat 21, and the expansion body end 22 is frustum-shaped, and its inner diameter is equivalent to that of the cylinder end 12 of the cylinder body; so as to cooperate with the cylinder end 12 of the expansion tube 1 to form a percussion plane. A plurality of extrusion columns 23 are evenly spaced along the circumferential direction at the rear end of the expansion seat 21, the number of the extrusion columns 23 matches the number of expansion pieces 13 of the expansion tube 1, and the position of each extrusion column 23 is aligned with the corresponding expansion piece 3, so as to ensure that when the expansion nail 3 drives the expansion body 2, the extrusion column 23 can accurately act on the inner side of the expansion piece 13 to make it expand uniformly outward.

[0039] In the present invention, a transition inclined surface or a strengthening part can be provided between the expansion seat 21 and the expansion body end 22 to improve the overall structural strength and prevent deformation under force.

[0040] This structural design enables the extrusion column 23 to uniformly and efficiently push the expansion piece 13 to expand outward when the expansion body 2 is impacted by the expansion nail 3, so as to achieve a fast and reliable anchoring effect.

[0041] In the present invention, continuous positioning grooves 4 are provided on the cylinder part 11 and the expansion piece 13, the positioning grooves 4 are strip-shaped positioning grooves, and a preferred way of the strip-shaped positioning grooves is that they are arranged at the middle position of the expansion piece 13; positioning convex parts 5 are provided at positions corresponding to the extrusion columns 23 and the positioning grooves 4, and the positioning convex parts 5 are arranged in the strip-shaped positioning grooves 4. When the front end of the expansion tube 1 is struck, the expansion nail 3 moves inward into the expansion body 2 under the action of the axial impact force, the rear end of the expansion nail 3 forces the expansion body 2 to expand radially, and the positioning convex part 5 squeezes the strip-shaped positioning groove 4, so that the expansion piece 13 can receive uniform extrusion force, and the plurality of expansion pieces 13 can synchronously open the same angle.

[0042] The expansion nail 3 of the present invention includes a nail body 31, a connecting part 32 with a diameter smaller than that of the nail body 31 is provided at the front end of the nail body 31, a central relief hole 33 is provided at the rear end of the expansion seat 21, the connecting part 32 is movably arranged in the central relief hole 33, and an extrusion head 34 capable of pushing open the extrusion column 23 is provided at the rear end of the nail body 31.

[0043] The expansion nail 3 of the present invention can be manufactured by a cold heading forming process using SAE 1045 medium carbon steel, and its rod diameter is accurately calculated to be Φ6±0.1mm to Φ45±0.1mm (which can be scaled proportionally according to the load-bearing requirements during specific implementation). The connecting part 32 adopts a diameter reduction design, and a precision stepped structure of Φ3mm×8mm to Φ12.96mm×8mm is machined at the front end of the nail body by a numerical control machine tool.

[0044] During the installation process, the nail body 31 is axially moved by an external force. The connecting part 32 is initially positioned within the central relief hole 33 and moves towards the front end of the expansion seat 21. The extrusion head 34 contacts the extrusion column 23, and the hyperbolic structure generates a radial component force, causing the extrusion column 23 to elastically deform and expand outwards. The connecting part and the central relief hole 33 are in interference fit to form a lock, and multiple expansion pieces 13 enter a state of force balance. This process can be completed within 3 - 5 seconds, significantly superior to the installation efficiency of traditional expansion bolts.

[0045] In the present invention, the extrusion column 23 is a square rod, and one edge of the square rod is disposed within the positioning groove 4. An arc-shaped inclined surface 6 is provided on the surface of the square rod opposite to this edge. In the present invention, through the arc-shaped inclined surface 6, the external force applied by the expansion nail 3 can be effectively concentrated and transmitted to this edge, so that the expansion piece 13 can obtain sufficient deformation energy.

[0046] In the present invention, a positioning concave platform 7 is provided inside the front end of the cylinder part 11, and the expansion body end 22 is disposed on the positioning concave platform 7. In the present invention, through the positioning concave platform 7, the expansion body end 22 can be stably installed inside the cylinder part 11.

[0047] In the present invention, a first marking line 8 is provided on the cylinder end 12, and a second marking line 9 is provided at a position corresponding to the first marking line 8 on the expansion body end 22. The first marking line 8 and the second marking line 9 can be used for quick alignment, making the installation more convenient.

[0048] In the present invention, multiple extrusion columns 23 are arranged to be open from the front end to the rear end. Multiple expansion pieces 13 are arranged to be open from the front end to the rear end. The divergent arrangement enables the expansion pieces 13 to expand outwards better.

[0049] The above has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A percussion expansion bolt, comprising an expansion tube (1), characterized in that: An expansion body (2) is arranged inside the expansion tube (1), and an expansion nail (3) that can cause the expansion body (2) to push open the expansion tube (1) when the end of the expansion tube (1) is struck is arranged inside the expansion body (2).

2. The percussion expansion bolt according to claim 1, characterized in that: The expansion tube (1) includes a cylinder part (11), a cylinder end (12) is provided at the front end of the cylinder part (11), and a plurality of expansion sheets (13) that can open relative to the cylinder part (11) are arranged at intervals at the rear end of the cylinder part (11).

3. The percussion expansion bolt according to claim 2, wherein: The expansion body (2) includes an expansion seat (21), an expansion body end (22) is provided at the front end of the expansion seat (21), and a number of extrusion columns (23) equivalent to the expansion sheets (13) are arranged at intervals at the rear end of the expansion seat (21).

4. The percussion expansion bolt according to claim 2, wherein: A continuous positioning groove (4) is arranged on the cylinder part (11) and the expansion sheet (13), a positioning convex part (5) is arranged at a position corresponding to the extrusion column (23) and the positioning groove (4), and the positioning convex part (5) is arranged in the positioning groove (4).

5. The percussion expansion bolt according to claim 3, characterized in that: The expansion nail (3) includes a nail body (31), a connecting part (32) with a diameter smaller than that of the nail body (31) is provided at the front end of the nail body (31), a central relief hole (33) is provided at the rear end of the expansion seat (21), the connecting part (32) is movably arranged in the central relief hole (33), and an extrusion head (34) that can push open the extrusion column (23) is provided at the rear end of the nail body (31).

6. The percussion expansion bolt according to claim 4, characterized in that: The extrusion column (23) is a square rod, one edge of the square rod is arranged in the positioning groove (4), and an arc-shaped inclined surface (6) is arranged on a surface of the square rod opposite to the edge.

7. The percussion expansion bolt according to claim 3, wherein: A positioning concave platform (7) is arranged inside the front end of the cylinder part (11), and the expansion body end (22) is arranged on the positioning concave platform (7).

8. The percussion expansion bolt according to claim 3, characterized in that: A first marking line (8) is arranged on the cylinder end (12), and a second marking line (9) is arranged at a position corresponding to the expansion body end (22) and the first marking line (8).

9. The percussion expansion bolt according to claim 3, wherein: The plurality of extrusion columns (23) are arranged to open from the front end to the rear end.

10. A percussion expansion bolt according to claim 9, characterized in that: The plurality of expansion sheets (13) are arranged to open from the front end to the rear end.

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