Self-tapping expansion bolt mounting mechanism

Abstract

The invention relates to the technical field of self-tapping expansion bolt installation, and provides a self-tapping expansion bolt installation mechanism, which comprises an outer sleeve, an inner sleeve, an outer sleeve, an inner sleeve, an outer sleeve, an inner sleeve and an outer sleeve, and is characterized in that an opening is formed in one axial end of the outer sleeve while an embedding hole used for connecting a self-tapping expansion bolt tail nut is formed in the other end; the inner rod is coaxially inserted and matched with the outer sleeve, and the inner rod and the outer sleeve can synchronously rotate in a coupling state and relatively rotate in a decoupling state; the end, facing the embedding hole, of the inner rod is provided with a first connecting part, and the other end is provided with a second connecting part used for being connected with a drilling machine. The inner rod is in sliding fit with the outer sleeve in the axial direction, so that the first connecting part and the bolt body of the self-tapping expansion bolt can be connected in the decoupling state and separated in the coupling state; and the coupling structure is used for coupling the inner rod and the outer sleeve in a coupling state. By means of the arrangement, the nut does not need to be screwed through a wrench or a mounting sleeve or a drilling machine or other tools after drilling is completed, the mounting procedure is further simplified, and the mounting efficiency of the self-tapping expansion bolt is improved.

Description

Technical Field

[0001] The invention relates to the technical field of self-drilling expansion bolt installation, in particular to a self-drilling expansion bolt installation mechanism. Background Art

[0002] Compared with traditional expansion bolts, self-drilling expansion bolts are an integrated bolt that does not require separate holes to be drilled using an electric drill. It combines drilling and expansion fastening. The overall installation efficiency is improved by omitting drill tools and drilling, hole entry and installation processes.

[0003] However, in the actual construction process, after the self-drilling expansion bolt completes the drilling operation, it is necessary to use a hex wrench or install a hex socket and an electric drill to rotate and tighten the fastening nut of the self-drilling expansion bolt to achieve the expansion of the expansion tube and achieve the tightening effect. The construction process still has the problem of low efficiency, which is also one of the factors limiting the promotion of self-drilling expansion bolts. Summary of the invention

[0004] The invention provides a self-tapping expansion bolt installation mechanism, which is used to solve the defect of low construction efficiency of self-tapping expansion bolts in the prior art, can simplify the process of self-tapping expansion bolts, and improve the construction efficiency of self-tapping expansion bolts.

[0005] The present invention provides a self-tapping expansion bolt installation mechanism, comprising: The outer sleeve has an opening at one end along the axial direction and a fitting hole for connecting the tail nut of the self-tapping expansion bolt at the other end; The inner rod is coaxially plugged with the outer sleeve, and can rotate synchronously with the outer sleeve in a coupled state and relatively rotate in a decoupled state; the inner rod is provided with a first connecting portion at one end facing the fitting hole, and a second connecting portion at the other end, and the second connecting portion is used to connect the drilling rig; the inner rod is slidably matched with the outer sleeve in the axial direction, so that the first connecting portion and the bolt body of the self-tapping expansion bolt can be connected in the decoupled state and separated in the coupled state; The coupling structure is suitable for coupling the inner rod and the outer sleeve in the coupling state.

[0006] According to a self-tapping expansion bolt installation mechanism provided by the present invention, the coupling structure includes a first keyway and a second keyway; The first keyway is arranged on the outer circumference of the inner rod, and the second keyway is arranged on the inner wall of the outer sleeve to match the first keyway. In the coupled state, the first keyway is keyed to the second keyway.

[0007] A self-tapping expansion bolt installation mechanism provided according to the present invention also includes an elastic member, and the inner rod has a tendency to move away from the engaging hole under the elastic force of the elastic member, and under the elastic force of the elastic member, the inner rod and the outer sleeve remain in a coupled state.

[0008] According to a self-tapping expansion bolt installation mechanism provided by the present invention, the elastic member comprises a spring; A first stop shoulder is protruded radially on the outer circumference of the inner rod, and a second stop shoulder is protruded radially on the inner wall of the outer sleeve, wherein the second stop shoulder is closer to the fitting hole than the first stop shoulder; The spring is sleeved on the inner rod and two ends of the spring are respectively in contact with the first stop shoulder and the second stop shoulder.

[0009] A self-drilling expansion bolt installation mechanism provided by the present invention further includes a limiting structure, wherein the limiting structure includes: A first stopper, provided on the inner rod; The second stopper is arranged on the outer sleeve. The second stopper is closer to the opening end of the outer sleeve relative to the first stopper. In the direction away from the fitting hole, the first stopper abuts against the second stopper and is limited.

[0010] According to a self-drilling expansion bolt installation mechanism provided by the present invention, the first stopper is radially protruded on the outer periphery of the inner rod; and the second stopper is radially protruded on the inner wall of the outer sleeve.

[0011] According to a self-drilling expansion bolt installation mechanism provided by the present invention, a retaining spring groove is provided on the inner wall of the outer sleeve, and the second stopper comprises a retaining spring, and the retaining spring is embedded in the retaining spring groove.

[0012] According to a self-drilling expansion bolt installation mechanism provided by the present invention, the first stopper is configured to be annular and is arranged coaxially with the inner rod, and the first keyway is provided on the outer periphery of the first stopper.

[0013] According to a self-tapping expansion bolt installation mechanism provided by the present invention, an embedding groove with a polygonal cross-section is provided at the end of the inner rod facing the embedding hole, forming the first connecting portion.

[0014] According to a self-drilling expansion bolt installation mechanism provided by the present invention, the second connecting portion is configured as a polygonal columnar structure exposed from the outer sleeve and arranged coaxially with the inner rod. The self-drilling expansion bolt installation mechanism provided by the present invention has the following advantages: after the drilling of the self-drilling expansion bolt is completed, it is only necessary to control the inner rod to move axially so that the inner rod is separated from the bolt body and coupled with the outer sleeve, and the drilling rig can be used to drive the inner rod and the outer sleeve to rotate synchronously to drive the nut to rotate, thereby realizing the installation of the self-drilling expansion bolt. There is no need to use a wrench or an installation sleeve, a drilling rig or other tools to screw the nut after the drilling is completed, which further simplifies the installation process and improves the installation efficiency of the self-drilling expansion bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a structural schematic diagram of a self-tapping expansion bolt in the related art.

[0017] Figure 2 It is a schematic diagram of the cooperation between the self-tapping expansion bolt installation mechanism and the self-tapping expansion bolt provided in an embodiment of the present invention.

[0018] Figure 3 This is one of the cross-sectional views of the self-drilling expansion bolt installation mechanism and the self-drilling expansion bolt provided in the embodiment of the present invention.

[0019] Figure 4 This is the second cross-sectional view of the cooperation between the self-drilling expansion bolt installation mechanism and the self-drilling expansion bolt provided by the embodiment of the present invention.

[0020] Figure 5 It is an exploded view of the self-tapping expansion bolt installation mechanism provided by an embodiment of the present invention.

[0021] Reference numerals: 10. Bolt body; 11. Nut; 12. Washer; 13. Expander; 14. Drill; 20. Outer sleeve; 200. Fitting hole; 201. Second shoulder; 202. Second stop; 21. Inner rod; 210. Fitting groove; 211. Second connecting portion; 212. First shoulder; 213. First stop; 22. Coupling structure; 220. First keyway; 221. Second keyway; 23. Elastic member. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] To facilitate understanding of the self-drilling expansion bolt installation mechanism provided by the present invention, its application background is first introduced. Compared with traditional expansion bolts, self-drilling expansion bolts are bolts that do not require separate holes to be drilled using an electric drill and integrate drilling and expansion fastening. The overall installation efficiency is improved by omitting drill tools and drilling, hole entry and installation processes.

[0024] Reference Figure 1 In the related art, a self-drilling expansion bolt generally includes a bolt body 10, a nut 11, a washer 12, an expansion tube 13 and a drill 14; wherein the bolt body 10 is inserted into the expansion tube 13, the drill 14 is connected to the head end of the bolt body 10, the hexagonal nut 11 is connected to the tail end of the bolt body 10, and the washer 12 is arranged between the nut 11 and the expansion tube 13.

[0025] When in use, the tail of the bolt body 10 is connected to the drilling rig, and the drill bit 14 at the head end of the bolt body 10 abuts against the wall. After the drilling rig is started, the drill bit 14 is used to drill a hole, and the expansion tube 13 enters the drill hole. After the drilling operation is completed, the nut 11 is tightened with a wrench or a sleeve installed to match the electric drill. The nut 11 drives the expansion tube 13 to move to expand the expansion tube 13.

[0026] However, it is found in actual applications that, compared with traditional expansion bolts, although the installation efficiency of self-drilling expansion bolts is greatly improved, after drilling, it is necessary to use a wrench or reinstall the sleeve and electric drill to screw the nut 11 to achieve the expansion of the expansion tube 13. The construction process is complicated and there is still a problem of low efficiency. This problem has also become one of the factors limiting the promotion of self-drilling expansion bolts.

[0027] In view of the above problems, the present invention provides a self-drilling expansion bolt installation mechanism, which can further simplify the installation process of the self-drilling expansion bolts and improve the installation efficiency of the self-drilling expansion bolts.

[0028] Combine the following Figure 1-Figure 5 The self-drilling expansion bolt installation mechanism of the present invention is described.

[0029] Reference Figures 1 to 5, a self-tapping expansion bolt installation mechanism includes an outer sleeve 20, an inner rod 21 and a coupling structure 22; wherein, the outer sleeve 20 is provided with an opening at one end along the axial direction, and a fitting hole 200 is provided at the other end, and the fitting hole 200 is used to connect the nut 11 at the tail of the self-tapping expansion bolt; the inner rod 21 is coaxially plugged with the outer sleeve 20, and the inner rod 21 and the outer sleeve 20 can rotate synchronously in a coupled state and relatively rotate in a decoupled state, and the inner rod 21 is provided with a first connecting portion at one end of the inner rod 21 facing the fitting hole 200, and a second connecting portion 211 is provided at the other end, and the second connecting portion 211 is used to connect a drilling rig, and the inner rod 21 is slidably matched with the outer sleeve 20 in the axial direction, so that the first connecting portion of the inner rod 21 and the bolt body 10 of the self-tapping expansion bolt can be connected in the above-mentioned decoupling state and separated in the above-mentioned coupling state; the coupling structure 22 is suitable for coupling the inner rod 21 and the outer sleeve 20 in the above-mentioned coupling state.

[0030] In a specific application scenario, when installing a self-tapping expansion bolt, the tail of the bolt body 10 of the self-tapping expansion bolt is inserted into the outer sleeve 20 through the fitting hole 200, the nut 11 of the self-tapping expansion bolt is fitted with the fitting hole 200, the second connection part 211 of the inner rod 21 is connected to the drilling rig, and the inner rod 21 is pushed axially so that the first connection part of the inner rod 21 is connected to the tail of the bolt body 10 in the outer sleeve 20. At this time, the inner rod 21 and the outer sleeve 20 are in a decoupled state, and the inner rod 21 and the outer sleeve 20 can rotate relative to each other in the decoupled state. The drilling rig is started, and the drilling rig drives the inner rod 21 to rotate while the outer sleeve 20 is in a free state. The inner rod 21 drives the bolt body 10 to rotate, and the bolt body 10 drives the drill 14 to rotate and drill a hole, and the expansion tube 13 enters the drilled hole. After the drilling is completed, the drilling rig is moved back to make the inner rod 21 move axially, and the first connecting part of the inner rod 21 is separated from the tail part of the bolt body 10. At this time, the inner rod 21 and the outer sleeve 20 are in a coupled state. In the coupled state, the inner rod 21 and the outer sleeve 20 can rotate synchronously. The drilling rig is started, and the drilling rig drives the outer sleeve 20 to rotate synchronously through the inner rod 21. The outer sleeve 20 drives the nut 11 to rotate while the bolt body 10 is fixed. Under the drive of the nut 11, the expansion tube 13 moves and expands, and the installation of the self-tapping expansion bolt is completed. The self-tapping expansion bolt is replaced, and the above steps are repeated until the construction is completed. Finally, the drilling rig is separated from the second connecting part 211.

[0031] Compared with the related art, after the drilling of the self-drilling expansion bolt is completed, it is only necessary to control the inner rod 21 to move axially so that the inner rod 21 is separated from the bolt body 10 and coupled with the outer sleeve 20, and the drilling rig can be used to drive the inner rod 21 and the outer sleeve 20 to rotate synchronously to drive the nut 11 to rotate, thereby realizing the installation of the self-drilling expansion bolt. There is no need to use a wrench or reinstall the sleeve and drilling rig and other tools to tighten the nut 11 after the drilling is completed, which further simplifies the installation process and improves the installation efficiency of the self-drilling expansion bolt.

[0032] In some optional embodiments, the specific shape, material, size and other parameters of the outer sleeve 20 can be flexibly designed according to actual needs. For ease of understanding and explanation, the outer sleeve 20 is taken as a round tube as a reference in the embodiments of the present invention, the axial direction of the outer sleeve 20 refers to the axial direction of the outer sleeve 20, and the radial direction refers to the diameter direction of the outer sleeve 20.

[0033] Specifically, one end of the outer sleeve 20 is set to be open, thereby forming the end opening of the outer sleeve 20 mentioned above, and the other end is provided with a polygonal fitting hole 200 for adapting to the polygonal outer peripheral surface of the nut 11. When the self-tapping expansion bolt is installed, the fitting hole 200 forms a polygonal fitting with the nut 11, so that the outer sleeve 20 can drive the nut 11 to rotate.

[0034] Depending on the difference in the outer circumferential surface of the nut 11, the shape of the embedding hole 200 will also be different. For example, when the nut 11 used is a hexagonal nut, the embedding hole 200 is a hexagonal hole. When the nut 11 used is a square nut, the embedding hole 200 is a quadrilateral hole. In other words, the specific shape of the embedding hole 200 can be designed according to actual needs. Therefore, the specific shape of the embedding hole 200 is not limited in the embodiment of the present invention.

[0035] In one embodiment of the present invention, the inner rod 21 is cylindrical and is inserted into the outer sleeve 20 through the opening at the end of the outer sleeve 20. The cylindrical inner rod 21 allows the inner rod 21 and the outer sleeve 20 to rotate relative to each other in a decoupled state. One end of the inner rod 21 faces the fitting hole 200, and the other end faces away from the fitting hole 200. The second connecting portion 211 is connected to the end of the inner rod 21 facing away from the fitting hole 200 for connecting to a drilling rig.

[0036] Specifically, the second connection part 211 is configured as a polygonal columnar structure exposed from the outer sleeve 20 and coaxially arranged with the inner rod 21, and is used to adapt to the bayonet of the power output end of the drilling rig. The second connection part 211 and the inner rod 21 can be fixed by welding or integrally formed. The specific configuration can be based on actual needs. In this embodiment, in order to ensure structural strength, the second connection part 211 and the inner rod 21 are integrally formed. When the self-tapping expansion bolt is installed, the second connection part 211 is connected to the power output end of the drilling rig, so that the drilling rig can drive the inner rod 21 to rotate.

[0037] Depending on the specific form of the power output end of the drilling rig, the shape of the second connection part 211 will also be different. For example, when the bayonet of the power output end is set to a quadrilateral, the cross-section of the second connection part 211 is a quadrilateral. When the bayonet of the power output end is set to a hexagon, the cross-section of the second connection part 211 is a hexagon. In other words, the specific shape of the second connection part 211 can be designed according to actual needs. Therefore, the specific shape of the second connection part 211 is not limited in the embodiment of the present invention.

[0038] Of course, the second connection part 211 includes but is not limited to the above-mentioned structural forms, and any other structures or forms of the second connection part 211 that can be connected to the power output end of the drilling rig are applicable. For example, in other embodiments, the second connection part 211 can also be set in the form of a tooth key to cooperate with the power output end in the form of a tooth key. For other forms of the second connection part 211, they are not listed one by one in the embodiments of the present invention.

[0039] In one embodiment of the present invention, a polygonal fitting groove 210 is provided at the end of the inner rod 21 facing the fitting hole 200, which is suitable for fitting with the polygonal outer peripheral surface of the rear end of the bolt body 10, thereby forming the above-mentioned first connecting portion. During the drilling stage of the self-drilling expansion bolt, the fitting groove 210 fits with the polygonal rear end of the bolt body 10, so that the inner rod 21 can drive the bolt body 10 to rotate.

[0040] Similarly, depending on the different cross-sectional shapes of the rear end of the bolt body 10, the shape of the engaging groove 210 will also be different. For example, when the cross-sectional shape of the rear end of the bolt body 10 is a quadrilateral, the engaging groove 210 is a quadrilateral groove, and when the cross-sectional shape of the rear end of the bolt body 10 is a hexagon, the engaging groove 210 is a hexagonal groove. In other words, the specific shape of the engaging groove 210 can be designed according to actual needs. Therefore, the specific shape of the engaging groove 210 is not limited in the embodiment of the present invention.

[0041] Of course, the first connecting part includes but is not limited to the structures or forms listed above. When the structure or form of the bolt body 10 changes, the structure or form of the first connecting part can be adaptively changed as long as the first connecting part can be connected to the bolt body 10.

[0042] When installing the self-tapping expansion bolt, the second connecting part 211 is connected to the output end of the drilling rig, the engaging hole 200 at the end of the outer sleeve 20 is engaged with the nut 11, and the inner rod 21 is pushed axially to make the engaging groove 210 at the end of the inner rod 21 engage with the tail of the bolt body 10. At this time, the inner rod 21 and the outer sleeve 20 are in a decoupled state. After starting the drilling rig, the inner rod 21 drives the bolt body 10 to rotate for drilling. After the drilling is completed, the inner rod 21 is moved axially, and the engaging groove 210 is separated from the tail of the bolt body 10. At this time, the inner rod 21 and the outer sleeve 20 are in a coupled state. After starting the drilling rig, the inner rod 21 drives the outer sleeve 20 to rotate synchronously to screw the nut 11, thereby realizing the installation of the self-tapping expansion bolt.

[0043] In one embodiment of the present invention, the coupling structure 22 includes a first key groove 220 and a second key groove 221; wherein the first key groove 220 is provided on the outer peripheral surface of the inner rod 21, and the second key groove 221 is provided on the inner wall of the outer sleeve 20 to match the first key groove 220, and in the coupled state, the first key groove 220 is keyed with the second key groove 221. Through the above technical solution, the inner rod 21 can be coupled or decoupled with the outer sleeve 20 while the inner rod 21 slides axially to connect or separate with the rear of the bolt body 10, further simplifying the process and improving the installation efficiency.

[0044] Specifically, the coupling structure 22 is located between the fitting hole 200 and the opening of the outer sleeve 20. When the inner rod 21 moves axially toward the tail of the bolt body 10 and is finally connected to the bolt body 10, the first key groove 220 is separated from the second key groove 221, and the inner rod 21 is decoupled from the outer sleeve 20. After the drilling is completed, the inner rod 21 is moved axially away from the tail of the bolt body 10 and is finally separated from the bolt body 10. The first key groove 220 is keyed with the second key groove 221, so that the inner rod 21 and the outer sleeve 20 are in a coupled state.

[0045] In one embodiment of the present invention, the self-tapping expansion bolt installation mechanism also includes an elastic member 23, and the inner rod 21 has a tendency to move away from the mating hole 200 under the elastic force of the elastic member 23, and under the elastic force of the elastic member 23, the inner rod 21 and the outer sleeve 20 remain in a coupled state.

[0046] Through the above technical solution, during the drilling stage, the elastic force of the elastic member 23 needs to be overcome in the process of pushing the inner rod 21 axially toward the tail of the bolt body 10. After the drilling is completed, the thrust is removed, and the inner rod 21 moves away from the mating hole 200 under the action of the elastic member 23, and finally the first keyway 220 is keyed with the second keyway 221, and the inner rod 21 and the outer sleeve 20 remain in a coupled state, so as to facilitate the screwing of the nut 11.

[0047] It is understandable that the coupling structure 22 includes but is not limited to the above-mentioned forms. Other coupling structures 22 that can achieve coupling and decoupling between the inner rod 21 and the outer sleeve 20 are applicable and are not listed one by one in the embodiments of the present invention.

[0048] In one embodiment of the present invention, the elastic member 23 includes a spring; a first shoulder 212 is radially protruded from the outer periphery of the inner rod 21, and a second shoulder 201 is radially protruded from the inner wall of the outer sleeve 20, the second shoulder 201 is closer to the engaging hole 200 relative to the first shoulder 212, the spring is sleeved on the inner rod 21 and its two ends are respectively in contact with the first shoulder 212 and the second shoulder 201.

[0049] Specifically, the first shoulder 212 is annular and coaxially arranged with the inner rod 21 , and the first shoulder 212 and the inner rod 21 are integrally formed; the second shoulder 201 is annular and coaxially arranged with the outer sleeve 20 , and the second shoulder 201 and the outer sleeve 20 are integrally formed.

[0050] In order to prevent the inner rod 21 from disengaging from the outer sleeve 20, in one embodiment of the present invention, the self-tapping expansion bolt installation mechanism also includes a limiting structure, which includes a first stop 213 and a second stop 202; wherein, the first stop 213 is arranged on the inner rod 21, and the second stop 202 is arranged on the outer sleeve 20, and the second stop 202 is close to the opening end of the outer sleeve 20 relative to the first stop 213, and in the direction away from the engaging hole 200, the first stop 213 and the second stop 202 can abut and be limited.

[0051] The first stop 213 and the second stop 202 have a variety of selectable structures or forms. In a specific embodiment of the present invention, the first stop 213 is annular and coaxially arranged with the inner rod 21, and the first stop 213 is radially protruded from the outer periphery of the inner rod 21; the second stop 202 is annular and coaxially arranged with the outer sleeve 20, and the second stop 202 is radially protruded from the inner wall of the outer sleeve 20. When the inner rod 21 moves away from the fitting hole 200 to reach a preset position, specifically when the inner rod 21 moves away from the fitting hole 200 under the action of the spring thrust to the position where the first keyway 220 and the second keyway 221 are keyed, the first stop 213 abuts against the second stop 202 to limit the inner rod 21 from continuing to move, thereby preventing the inner rod 21 from separating from the outer sleeve 20.

[0052] In one embodiment of the present invention, a retaining spring groove is provided on the inner wall of the outer sleeve 20, and the second stopper 202 is a retaining spring embedded in the retaining spring groove.

[0053] In one embodiment of the present invention, the first keyway 220 of the coupling structure 22 is disposed on the outer periphery of the first stopper 213, so that the structure of the self-drilling expansion bolt installation mechanism is more compact.

[0054] The specific method of using the self-drilling expansion bolt installation mechanism provided in the embodiment of the present invention is as follows: when installing the self-drilling expansion bolt, the second connecting portion 211 at the end of the inner rod 21 is connected to the drilling machine, the tail of the bolt body 10 is inserted into the outer sleeve 20 through the fitting hole 200, the fitting hole 200 at the end of the outer sleeve 20 is fitted with the nut 11 at the tail of the self-drilling expansion bolt, the drill bit 14 of the self-drilling expansion bolt is pressed against the construction wall and a certain pressure is applied, the inner rod 21 slides axially relative to the outer sleeve 20 until the fitting groove 210 and the tail of the bolt body 10 are fitted. The spring is compressed during the process, and then the drill is started. The drill drives the bolt body 10 to rotate through the inner rod 21, the drill bit 14 rotates to drill and the expansion tube 13 enters the drill hole. After the drilling is completed, the pressure is released, and the inner rod 21 moves away from the engaging hole 200 under the push of the spring until the first keyway 220 is keyed with the second keyway 221. At this time, the inner rod 21 and the outer sleeve 20 are in a coupled state, and the drill is started. The drill drives the outer sleeve 20 to rotate synchronously through the inner rod 21, so that the nut 11 is screwed to realize the installation of the self-tapping expansion bolt.

[0055] By using the self-drilling expansion bolt installation mechanism provided by the embodiment of the present invention, after the drilling of the self-drilling expansion bolt is completed, it is only necessary to control the inner rod 21 to move axially so that the inner rod 21 is separated from the bolt body 10 and coupled with the outer sleeve 20, and the drilling rig can be used to drive the inner rod 21 and the outer sleeve 20 to rotate synchronously to drive the nut 11 to rotate, thereby realizing the installation of the self-drilling expansion bolt. There is no need to use a wrench or installation sleeve, a drilling rig or other tools to screw the nut 11 after the drilling is completed, which further simplifies the installation process and improves the installation efficiency of the self-drilling expansion bolt.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-tapping expansion bolt installation mechanism, characterized in that: include: An outer sleeve (20) is provided with an opening at one end along the axial direction and a fitting hole (200) for connecting a tail nut (11) of a self-tapping expansion bolt at the other end; The inner rod (21) is coaxially plugged with the outer sleeve (20), and can rotate synchronously with the outer sleeve (20) in a coupled state and relatively rotate in a decoupled state; the inner rod (21) is provided with a first connection portion at one end facing the fitting hole (200), and a second connection portion (211) at the other end, and the second connection portion (211) is used to connect to a drilling rig; the inner rod (21) is slidably matched with the outer sleeve (20) in the axial direction, so that the first connection portion and the bolt body (10) of the self-tapping expansion bolt can be connected in the decoupled state and separated in the coupled state; The coupling structure (22) is suitable for coupling the inner rod (21) and the outer sleeve (20) in the coupling state.

2. The self-drilling expansion bolt installation mechanism according to claim 1, characterized in that: The coupling structure (22) comprises a first keyway (220) and a second keyway (221); The first keyway (220) is arranged on the outer circumference of the inner rod (21), and the second keyway (221) is arranged on the inner wall of the outer sleeve (20) to match the first keyway (220). In the coupled state, the first keyway (220) is keyed to the second keyway (221).

3. The self-drilling expansion bolt installation mechanism according to claim 2, characterized in that: It also includes an elastic member (23), and the inner rod (21) has a tendency to move away from the fitting hole (200) under the elastic force of the elastic member (23), and under the elastic force of the elastic member (23), the inner rod (21) and the outer sleeve (20) maintain a coupled state.

4. The self-drilling expansion bolt installation mechanism according to claim 3, characterized in that: The elastic member (23) comprises a spring; The outer periphery of the inner rod (21) is provided with a first stop shoulder (212) protruding in the radial direction, and the inner wall of the outer sleeve (20) is provided with a second stop shoulder (201) protruding in the radial direction, and the second stop shoulder (201) is closer to the fitting hole (200) than the first stop shoulder (212); The spring is sleeved on the inner rod (21) and two ends thereof are respectively in contact with the first stop shoulder (212) and the second stop shoulder (201).

5. The self-drilling expansion bolt installation mechanism according to claim 3, characterized in that: It also includes a limiting structure, which includes: A first stopper (213) is provided on the inner rod (21); The second stopper (202) is arranged on the outer sleeve (20). The second stopper (202) is close to the end opening of the outer sleeve (20) relative to the first stopper (213). In the direction away from the interlocking hole (200), the first stopper (213) and the second stopper (202) are abutted and limited.

6. The self-drilling expansion bolt installation mechanism according to claim 5, characterized in that: The first stopper (213) is radially protruding from the outer periphery of the inner rod (21); and the second stopper (202) is radially protruding from the inner wall of the outer sleeve (20).

7. The self-drilling expansion bolt installation mechanism according to claim 6, characterized in that: A retaining spring groove is provided on the inner wall of the outer sleeve (20), and the second stopper (202) comprises a retaining spring, which is embedded in the retaining spring groove.

8. The self-drilling expansion bolt installation mechanism according to claim 6, characterized in that: The first stopper (213) is annular and arranged coaxially with the inner rod (21), and the first key groove (220) is arranged on the outer periphery of the first stopper (213).

9. The self-drilling expansion bolt installation mechanism according to any one of claims 1 to 8, characterized in that: The end of the inner rod (21) facing the fitting hole (200) is provided with a fitting groove (210) with a polygonal cross section, forming the first connecting portion.

10. The self-drilling expansion bolt installation mechanism according to any one of claims 1 to 8, characterized in that: The second connecting portion (211) is configured as a polygonal columnar structure exposed from the outer sleeve (20) and coaxially arranged with the inner rod (21).

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