Expansion bolt

Abstract

The expansion bolt comprises a screw rod, an expansion pipe, a flat gasket, a spring gasket and a nut, the expansion pipe is of a hollow structure, the expansion pipe is arranged on the screw rod in a sleeved mode, the two ends of the screw rod are exposed out of the two ends of the expansion pipe respectively, the screw rod is provided with a threaded section, and the flat gasket, the spring gasket and the nut are arranged on the threaded section in a matched mode. The expansion bolt further comprises a pressure deformation gasket, the pressure deformation gasket is located between the nut and the flat gasket, and the longitudinal section of the pressure deformation gasket is gt; and the cross section of the metal gasket is circular. The expansion bolt is provided with the pressure deformation gasket, and after the expansion bolt is installed in a building hole, the longitudinal section of the pressure deformation gasket is gt; the expansion bolt is extruded and deformed into an n shape, the tensile strength and the installation quality of the expansion bolt can be directly obtained by checking the deformation condition of the pressure deformation gasket, a drawing force tester does not need to be additionally used for secondary inspection, and the installation reliability and convenience of the expansion bolt are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering construction, and particularly relates to an expansion bolt. Background Art

[0002] An expansion bolt is a special threaded connector used to fix pipeline brackets, hangers, brackets and equipment on walls, floors and columns. It mainly consists of a countersunk bolt, an expansion tube, a flat washer, a spring washer and a hexagon nut. Under the existing technology, an expansion bolt first drills a deep hole at the reserved fixing position of an object through an electric drill, and then inserts the bolt and the expansion tube into the deep hole. After tightening the fixing nut, the bolt, the expansion tube and the object to be fixed can be tightened, and then the fixing object is locked and fixed.

[0003] The expansion bolt belongs to a post-anchoring fitting. If the diameter of the building hole drilled before anchoring is too large, or the strength of the building body is insufficient, or the expansion tube is too thick or too thin, or the length of the sleeve is insufficient, or the installation method is wrong, it may cause the expansion tube to fail to generate sufficient extrusion force and friction force with the building, and an accident of the expansion bolt falling off may occur after being subjected to a certain pulling force during use.

[0004] Since it is impossible to observe with the naked eye whether the expansion tube inside the building hole expands and generates sufficient extrusion force and friction force with the building after the expansion bolt is installed in the building hole, a method of randomly selecting some expansion bolts for pull-out force testing is usually used to verify the tensile strength and installation quality of the expansion bolt. However, this method can only select a small number of expansion bolts for testing, there is a large probability of omission, and the pull-out force test process is relatively cumbersome, which will reduce work efficiency. Therefore, it is necessary to provide an expansion bolt that can directly determine whether the tensile strength meets the design requirements during the installation process. Summary of the Utility Model

[0005] To solve the above technical problems, the utility model provides an expansion bolt.

[0006] To achieve the above utility model purpose, the technical scheme adopted by the utility model is: an expansion bolt, including a screw rod, an expansion tube, a flat gasket, a spring gasket and a nut. The expansion tube is of a hollow structure. The expansion tube is sleeved on the screw rod. Both ends of the screw rod respectively expose from both ends of the expansion tube. The screw rod is provided with a threaded section. The flat gasket, the spring gasket and the nut are arranged on the threaded section. The expansion bolt further includes a pressure deformation gasket. The pressure deformation gasket is located between the nut and the flat gasket. The pressure deformation gasket is a metal gasket with a longitudinal section in the shape of ">" and a cross-section in a circular shape.

[0007] Further, the maximum diameter of the conical expansion head is not less than the inner diameter of the expansion tube. One end of the expansion tube close to the conical expansion head is provided with a plurality of notches.

[0008] Further, the diameter of the conical expansion head gradually increases in the direction away from the threaded section.

[0009] Further, the notch is a long strip extending along the axial direction of the expansion tube, and a plurality of the notches are distributed at intervals along the circumferential direction of the expansion tube.

[0010] Further, the expansion tube is a steel casing.

[0011] Further, two flat gaskets are provided on the expansion bolt, namely a first flat gasket and a second flat gasket. The spring gasket is arranged between the nut and the first flat gasket, the pressure deformation gasket is arranged between the first flat gasket and the second flat gasket, and the second flat gasket is adjacent to the expansion tube.

[0012] Further, the pressure deformation gasket is a metal gasket with a longitudinal section in the shape of ">" and a cross-section in the shape of a circle.

[0013] Due to the application of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0014] The expansion bolt of the present utility model is configured with a pressure deformation gasket. After the expansion bolt is installed in the building hole, the longitudinal section of the pressure deformation gasket is squeezed and deformed from ">" to "n". By checking the deformation of the pressure deformation gasket, the tensile strength and installation quality of the expansion bolt can be directly obtained, without the need to additionally use a pull-out force tester for secondary inspection, effectively improving the installation reliability and convenience of the expansion bolt. Description of the Drawings

[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, some of the following drawings are embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the expansion bolt of the present utility model;

[0017] Figure 2 It is a cross-sectional view of the pressure deformation gasket of the present utility model. Specific Embodiments

[0018] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solution in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0019] It should be noted that the terms "first", "second", etc. in the description and claims of this application and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances for the embodiments of this application described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] In this application, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0021] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0022] In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can also be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The following will detail the present application with reference to the accompanying drawings and in conjunction with the embodiments.

[0024] Please refer to Figure 1 and Figure 2 , the present utility model provides an expansion bolt, which includes a screw rod 10, an expansion tube 20, a flat gasket, a pressure deformation gasket 40, a spring gasket 50, and a nut 60. The expansion tube 20 is a hollow structure, and the expansion tube 20 is sleeved on the screw rod 10. Both ends of the screw rod 10 protrude from both ends of the expansion tube 20 respectively. The screw rod 10 is provided with a threaded section 12, and the flat gasket, the pressure deformation gasket 40, the spring gasket 50, and the nut 60 are arranged on the threaded section 12. The pressure deformation gasket 40 and the spring gasket 50 are arranged between the nut 60 and the flat gasket. One end of the screw rod 10 is provided with a conical expansion head 11, and the maximum diameter of the conical expansion head 11 is not less than the inner diameter of the expansion tube 20. One end of the expansion tube 20 close to the conical expansion head 11 is provided with a plurality of notches 21, and the pressure deformation gasket 40 is a metal gasket with a longitudinal section in the shape of ">" and a cross-section in a circular shape.

[0025] Further, the diameter of the conical expansion head 11 gradually increases in the direction away from the threaded section 12.

[0026] Further, the notches 21 are elongated strips extending along the axial direction of the expansion tube 20, and the plurality of notches 21 are spaced apart circumferentially along the expansion tube 20.

[0027] Further, the expansion tube 20 is a steel casing.

[0028] Further, the expansion bolt is provided with two flat gaskets, namely a first flat gasket 31 and a second flat gasket 32. The spring gasket 50 is arranged between the nut 60 and the first flat gasket 31, the pressure deformation gasket 40 is arranged between the first flat gasket 31 and the second flat gasket 32, and the second flat gasket 32 is adjacent to the expansion tube 20.

[0029] Further, the opening angle of the ">" shape of the pressure deformation gasket 40 can be determined according to the rated deformation pressure required in actual situations.

[0030] After the expansion bolt is installed in the building hole and the nut 60 is tightened, the screw rod 10 is slowly pulled out, and the expansion tube 20 expands under the action of the conical end 11, thereby generating a squeezing force and a frictional force on the building. When the nut 60 continues to be tightened, since the expansion tube 20 has generated a large squeezing force and frictional force on the building and the screw rod 10, the screw rod 10 cannot be pulled out any further. The pressure deformation gasket 40 is arranged between the nut 60 and the expansion tube 20. The pressure deformation gasket 40 becomes a spare part for transmitting pressure between the screw rod 10 and the expansion tube 20. Since the longitudinal section of the pressure deformation gasket 40 is in the shape of ">", when the tensile force of the screw rod 10 pulling outwards is greater than the rated deformation pressure of the pressure deformation gasket 40, the pressure deformation gasket 40 exhibits yield deformation when subjected to the tightening force of the nut 60. When the longitudinal section of the pressure deformation gasket 40 is squeezed from the original ">" shape to the "n" shape by the nut 60, the tensile force of the screw rod 10 pulling outwards has been greater than the rated deformation pressure of the pressure deformation gasket 40, then the tensile strength of the expansion bolt installed this time has reached the design value. At the same time, since the longitudinal section of the pressure deformation gasket 40 is squeezed from the original ">" shape to the "n" shape by the nut 60 and exhibits permanent yield deformation, no additional tensile load will be brought to the expansion bolt during use.

[0031] According to different requirements, pressure deformation gaskets 40 of different models can be manufactured, and the installation quality of expansion bolts with different tensile strengths can be inspected by using pressure deformation gaskets 40 of different models.

[0032] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to the above embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to the above embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An expansion bolt, comprising a screw rod (10), an expansion tube (20), a flat washer, a spring washer (50) and a nut (60), characterized in that: The expansion tube (20) is a hollow structure. The expansion tube (20) is sleeved on the screw rod (10). The two ends of the screw rod (10) are exposed from the two ends of the expansion tube (20). The screw rod (10) is provided with a threaded section (12). The flat washer, the spring washer (50) and the nut (60) are arranged on the threaded section (12). One end of the screw rod (10) is provided with a conical expansion head (11). The expansion bolt also includes a pressure-deformable washer (40). The pressure-deformable washer (40) is located between the nut (60) and the flat washer. The pressure-deformable washer (40) is a metal washer with a longitudinal section in the shape of "">" and a cross section in the shape of a circle.

2. An expansion bolt according to claim 1, characterized in that: The maximum diameter of the conical expansion head (11) is not less than the inner diameter of the expansion tube (20), and a plurality of notches (21) are provided at one end of the expansion tube (20) close to the conical expansion head (11).

3. An expansion bolt as claimed in claim 2, characterized in that: The diameter of the conical expansion head (11) gradually increases in a direction away from the threaded section (12).

4. An expansion bolt as claimed in claim 2, characterized in that: The notch (21) is in the shape of a long strip extending axially along the expansion tube (20), and a plurality of the notches (21) are distributed at intervals in the circumferential direction of the expansion tube (20).

5. An expansion bolt according to claim 1, characterized in that: The expansion tube (20) is a steel casing.

6. An expansion bolt according to claim 1, characterized in that: The expansion bolt is provided with two flat washers, namely a first flat washers (31) and a second flat washers (32); the spring washer (50) is provided between the nut (60) and the first flat washer (31); the pressure deformation washer (40) is provided between the first flat washer (31) and the second flat washer (32); the second flat washer (32) is adjacent to the expansion tube (20).

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