An expansion bolt suitable for use with a variety of substrates

Abstract

The utility model relates to building fastener technical field especially suitable for a variety of base material's expansion bolt, and expansion bolt includes detachable connection's bolt cylinder, fixing piece and screw bolt. Bolt cylinder includes the cylinder portion and sets up the cylinder base at one end of cylinder portion, and the cylinder portion can be arranged in the mounting hole of base material, and the cylinder base sets up first screw hole, and fixing piece is rotatably connected with cylinder portion, and fixing piece can overturn around the rotating connection point, and the middle part of fixing piece is opened second screw hole along its thickness direction. Fixing piece has first position and second position, when first position, fixing piece is parallel to the longitudinal axis of cylinder portion, when second position, fixing piece is perpendicular to the longitudinal axis of cylinder portion. The scheme increases the contact area with base material, thereby improves the reliability and stability of fastening, especially suitable for soft, easy to crack or brittle base material.

Description

Technical Field

[0001] This utility model relates to the field of building fastener technology, and in particular to an expansion bolt suitable for various substrates. Background Technology

[0002] In recent years, prefabricated buildings have been widely promoted due to their efficient construction methods, reliable construction quality, and superior economic benefits. Among these, anchor bolts, as a fundamental material in prefabricated buildings, are widely used, leading to an increasing variety of expansion bolts for different scenarios and functions. Expansion bolts are fasteners widely used in the construction industry; their main function is to form a strong connection within the base material through expansion.

[0003] Traditional expansion bolts typically consist of a bolt shank, an expansion sleeve, and a nut. Their working principle involves tightening the nut to expand the expansion sleeve within the hole in the substrate, generating friction to achieve fixation. However, in softer or more crack-prone substrates, traditional expansion bolts have limited expansion force and insufficient load-bearing capacity, easily leading to insecure fixation or even detachment. Furthermore, existing expansion bolts are mostly suitable for rigid substrates such as concrete, performing poorly in lightweight or special substrates. Issues include reduced bolt tightening effectiveness due to the deformation and expansion of gypsum board, or weakened tightening effectiveness due to damage to soft substrates during bolt tightening, thus limiting the applicability of traditional expansion bolts. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an expansion bolt applicable to a variety of substrates, which solves the technical problems of insufficient load-bearing capacity and limited applicability of traditional expansion bolts in soft or easily cracked substrates due to limited expansion force.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0008] This utility model provides an expansion bolt suitable for various substrates, including a detachably connected bolt cylinder, a fixing member, and a screw. The bolt cylinder includes a cylinder body and a cylinder base at one end of the cylinder body. The cylinder body can pass through a mounting hole in the substrate, and the cylinder base has a first screw hole. The fixing member is rotatably connected to the cylinder body and can rotate around the rotation connection point. A second screw hole is formed in the middle of the fixing member along its thickness direction. The fixing member has a first position and a second position. In the first position, the fixing member is parallel to the longitudinal axis of the cylinder body. In the second position, the fixing member is perpendicular to the longitudinal axis of the cylinder body. When the screw is screwed into the first screw hole, it can drive the fixing member to rotate from the first position to the second position. Then, after the screw is screwed into the second screw hole, it can drive the fixing member to move along the longitudinal axis of the cylinder body towards the cylinder base until it fits against the substrate, thereby fixing the substrate between the cylinder base and the fixing member.

[0009] Preferably, the cylindrical body includes two cylindrical plates that are spaced apart and symmetrically arranged in the circumferential direction; the two cylindrical plates can penetrate the mounting holes of the substrate, and the fastener is disposed between the two cylindrical plates. The cylindrical plates are used to guide the fastener to rotate and move linearly along a predetermined path during the screw tightening process.

[0010] Preferably, the cylindrical body further includes two rotating shafts; the two rotating shafts are respectively fixed to the inner side of the two cylindrical bodies and are symmetrically arranged along the circumference of the cylindrical body. The axial direction of the rotating shafts is perpendicular to the axial direction of the cylindrical body. Connection holes are opened on both sides of the fixing member, and the rotating shafts are inserted through the connection holes to form a rotating connection point.

[0011] Preferably, the base of the cylinder, the two cylindrical bodies, and the two rotating shafts are integrally formed.

[0012] Preferably, the fastener is provided with a guide groove; the lower part of the guide groove is a tapered hole structure, and its inner wall gradually slopes outward from top to bottom to form an inclined guide surface. An angle is formed between the guide surface and the central axis of the fastener. When the screw moves along the guide surface toward the second screw hole, the screw can drive the fastener to rotate around the rotation axis from the first position to the second position until the screw enters the second screw hole.

[0013] Preferably, the second screw hole has a first thread on the side near the guide groove that is consistent with the screw thread direction, and a second thread on the side away from the guide groove that is opposite to the screw thread direction; the screw passes through the first thread and the second thread in sequence. When the screw is screwed into the second thread, the two rotating shafts break, and the fixing member moves along the longitudinal axis of the cylinder towards the base of the cylinder until it fits against the substrate.

[0014] Preferably, the side of the fixing member with the guide groove is provided with a rubber layer, which can adhere to the substrate.

[0015] Preferably, the end of the fastener away from the guide groove is provided with a cutting head; before installing the screw, the fastener is rotated synchronously by rotating the base of the cylinder, so that the cutting head rotates on the surface of the substrate to open a mounting hole that matches the expansion bolt.

[0016] Preferably, it also includes a connecting ring; the top of the cylinder base is provided with a mounting groove, the mounting groove is coaxially arranged with the first screw hole, the diameter of the mounting groove is larger than the diameter of the first screw hole, the mounting groove is located above the first screw hole and the two are connected, and the connecting ring is fixedly embedded in the mounting groove for detachable connection with an external drilling tool.

[0017] Preferably, the external drilling tool is a manual wrench or an electric screwdriver, and its driving end is engaged with or threaded into the connecting ring.

[0018] (III) Beneficial Effects

[0019] The beneficial effects of this utility model are:

[0020] This utility model discloses an expansion bolt suitable for various substrates, comprising a detachably connected bolt sleeve, a fixing member, and a screw. By rotating the screw, the fixing member, under the thrust of the screw, first rotates from a first position to a second position around the rotation connection point, and then moves along the longitudinal axis of the sleeve towards the base of the sleeve until it fits against the bottom of the substrate, thereby clamping and fixing the substrate. Compared with the traditional expansion bolt method of fastening by the deformation of the expansion sleeve, this solution increases the contact area with the substrate, thereby improving the reliability and stability of the fastening.

[0021] In addition, the expansion bolts in this solution will not expand the mounting holes of the substrate during the tightening process, avoiding the risk of damage to the substrate caused by traditional expansion bolts. They are particularly suitable for soft, crack-prone or brittle substrates, and can maintain a consistent tightening effect on substrates of various materials. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an expansion bolt suitable for various substrates according to the present invention when making holes;

[0023] Figure 2 This is a schematic diagram of the installation structure of an expansion bolt applicable to various substrates according to this utility model;

[0024] Figure 3 This is a schematic diagram of the installation structure of an expansion bolt applicable to various substrates according to this utility model;

[0025] Figure 4 This is an exploded view of an expansion bolt applicable to various substrates according to the present invention;

[0026] Figure 5This is a front view schematic diagram of an expansion bolt of the present invention, applicable to various substrates, used for drilling holes in the substrate.

[0027] Figure 6 This is a front view schematic diagram of an expansion bolt of the present invention, applicable to various substrates, used for substrate installation.

[0028] Figure 7 This is a side view of an expansion bolt of the present invention, applicable to various substrates, used for substrate installation.

[0029] [Explanation of Labels in the Attached Image]

[0030] 1: Bolt sleeve; 11: Sleeve base; 111: First screw hole; 112: Mounting groove; 12: Sleeve body; 13: Rotating shaft;

[0031] 2: Fixing component; 21: Guide groove; 22: Second screw hole; 23: Connecting hole; 24: Tool head;

[0032] 3: Screws;

[0033] 4: Connecting ring;

[0034] 5: Manual wrench;

[0035] 6: Substrate; 61: Mounting hole. Detailed Implementation

[0036] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0037] Example:

[0038] like Figure 1 and Figure 2 As shown, this embodiment provides an expansion bolt suitable for various substrates. The expansion bolt suitable for various substrates includes a detachably connected bolt sleeve 1, a fastener 2, and a screw 3.

[0039] Specifically, the bolt cylinder 1 includes a cylinder body and a cylinder base 11 disposed at one end of the cylinder body. The outer periphery of the cylinder base 11 is larger than the diameter of the cylinder body. The cylinder base 11 of the bolt cylinder 1 can abut against the top of the substrate 6, and the cylinder body can pass through the mounting hole 61 of the substrate 6. The fastener 2 is generally plate-shaped and is at least partially disposed inside the cylinder body. The fastener 2 is rotatably connected to the cylinder body and can rotate about the rotatable connection point. The fastener 2 has a first position and a second position. In the first position, the fastener 2 is parallel to the longitudinal axis of the cylinder body, that is, the angle between the fastener 2 and the longitudinal axis of the cylinder body is 0 degrees; in the second position, the fastener 2 is perpendicular to the longitudinal axis of the cylinder body, that is, the angle between the fastener 2 and the longitudinal axis of the cylinder body is 90 degrees. The cylinder base 11 has a first screw hole 111, which is coaxially disposed with the cylinder body. The fastener 2 has a second screw hole 22 in its thickness direction at its middle portion. As screw 3 is screwed into the first screw hole 111, it drives the fixing member 2 to rotate from the first position to the second position. More specifically, as screw 3 is inserted into the cylinder through the threaded engagement with the first screw hole 111, the fixing member 2 is rotated from the first position to the second position by the pushing force of screw 3. In the first position, the axis of the second screw hole 22 is perpendicular to the axis of screw 3; in the second position, that is, after the fixing member 2 rotates 90 degrees, the second screw hole 22 becomes coaxial with screw 3, thus allowing screw 3 to be screwed into the second screw hole 22. Moreover, after screw 3 is screwed into the second screw hole 22, it drives the fixing member 2 to move along the longitudinal axis of the cylinder towards the cylinder base 11 until the fixing member 2 is in contact with the bottom of the base material 6, thereby fastening the base material 6, that is, fixing the base material 6 between the cylinder base 11 and the fixing member 2. Compared with the traditional expansion bolt method of fastening by expansion sleeve deformation, this solution increases the contact area with the base material 6, thereby improving the reliability and stability of the fastening. In addition, the expansion bolts of this solution will not expand the mounting holes 61 of the substrate 6 during the tightening process, thus avoiding the risk of damage to the substrate 6 caused by traditional expansion bolts. It is particularly suitable for soft, crack-prone or brittle substrates 6, and can maintain a consistent tightening effect on substrates 6 of different materials.

[0040] Furthermore, such as Figure 4 As shown, the cylindrical portion of the bolt cylinder 1 includes two cylindrical plates 12 that are spaced apart and symmetrically arranged in the circumferential direction. The two cylindrical plates 12 can penetrate the mounting holes 61 of the substrate 6. A fastener 2 is disposed between the two cylindrical plates 12. The distance between the edges of the two cylindrical plates 12 on the same side is approximately equal to the width of the fastener 2, so as to guide the fastener 2 to rotate and move linearly along a predetermined path during the screwing of the screw 3 into the first screw hole 111 and the second screw hole 22.

[0041] like Figure 4As shown, the cylindrical body of the bolt cylinder 1 also includes two rotating shafts 13. The two rotating shafts 13 are respectively fixed to the inner sides of the two cylindrical bodies 12 and are symmetrically arranged along the circumference of the cylindrical body. The axial direction of the rotating shafts 13 is perpendicular to the axial direction of the cylindrical body. Connection holes 23 are respectively opened on both sides of the fixing member 2, and the rotating shafts 13 are inserted through the connection holes 23 to form a rotating connection point.

[0042] Furthermore, the cylinder base 11, the two cylinder plates 12, and the two rotating shafts 13 are integrally formed structures, and of course, they can also be fixedly connected by welding, riveting, or other connection methods.

[0043] It should be noted that the structural dimensions of the fastener 2 are reasonably designed so that it can be fully accommodated in the mounting hole 61 of the substrate 6 during the process of rotating around the rotation axis 13 from the first position to the second position under the drive of the screw 3, avoiding motion interference and ensuring that the flipping action is completed smoothly.

[0044] Preferably, such as Figure 4 As shown, the fixing member 2 is provided with a guide groove 21. The lower part of the guide groove 21 is a tapered hole structure, and its inner wall gradually slopes outward from top to bottom to form an inclined guide surface. An angle is formed between the guide surface and the central axis of the fixing member 2. When the screw 3 moves along the guide surface toward the second screw hole 22, due to the inclined wall of the guide groove 21, the screw 3 can drive the fixing member 2 to rotate around the rotation axis 13 from the first position to the second position until the screw 3 is accurately aligned and enters the second screw hole 22.

[0045] Furthermore, the second screw hole 22 has a first thread on the side near the guide groove 21 that is aligned with the thread direction of the screw 3, and a second thread on the side away from the guide groove 21 that is aligned with the thread direction of the screw 3. During the tightening process, the screw 3 passes through the first thread and the second thread in sequence. When the screw 3 enters the second thread, because the thread direction is opposite to the rotation direction of the screw 3, the screw 3 will exert an upward axial force on the fixing member 2 as it continues to be tightened. This axial force ultimately acts on the rotating shaft 13. As the tightening torque continues to increase, the axial force generated by the second thread gradually transforms into a tensile force acting on the fixing member 2. This tensile force is transmitted through the fixing member 2 to the rotating shaft 13, subjecting it to gradually increasing shear stress. When this shear stress reaches the fracture threshold of the rotating shaft 13, both rotating shafts 13 break. After the rotating shaft 13 breaks, the fixing part 2 loses its rotation constraint. The screw 3 is continuously tightened. The fixing part 2 moves along the longitudinal axis of the cylinder part towards the cylinder base 11 under the guidance of the cylinder body 12, and finally moves to fit with the substrate 6, thus completing the expansion and tightening of the expansion bolt.

[0046] It should be noted that the length and depth of the second thread are optimized to generate sufficient axial force during the screw 3 screwing process to trigger the breakage of the rotating shaft 13. However, after the rotating shaft 13 breaks, it will not completely prevent the screw 3 from continuing to move downward or the fastener 2 from moving axially. The screw 3 can pass through this area smoothly, allowing the fastener 2 to move axially along the cylindrical body 12.

[0047] To enhance the fastening stability of the bolts, provide a sealing effect and prevent relative slippage, a rubber layer is provided on one side of the fastener 2 where the guide groove 21 is provided, and the rubber layer can adhere to the substrate 6.

[0048] In order to enable direct hole making on substrate 6, such as Figure 1 As shown, the end of the fixing member 2 furthest from the guide groove 21 is provided with a cutting head 24, the cutting edge of which is positioned towards the end furthest from the guide groove 21. The length of the fixing member 2 is greater than the length of the cylindrical body 12, so that in the initial state, the cutting head 24 protrudes from the cylindrical body 12. When the expansion bolt is pressed into the substrate 6, the cutting head 24 preferentially contacts the surface of the substrate 6. By rotating the cylindrical base 11, the fixing member 2 rotates synchronously, causing the cutting head 24 to rotate on the surface of the substrate 6 to create a mounting hole 61 matching the expansion bolt. Subsequently, the cylindrical body 12 is inserted into the mounting hole 61 until the cylindrical base 11 abuts against the top of the substrate 6, achieving integrated self-drilling and anchoring. The design of the cutting head 24 eliminates the need for an additional hole opener in traditional methods, simplifying the operation process and improving construction efficiency. This solution is applicable to various materials and construction environments, expanding the application scenarios of expansion bolts and improving the flexibility and adaptability of construction.

[0049] like Figure 1 As shown, it also includes a connecting ring 4. (As shown) Figure 4 As shown, a mounting groove 112 is provided at the top of the cylinder base 11, and the mounting groove 112 is coaxially arranged with the first screw hole 111. The diameter of the mounting groove 112 is larger than the diameter of the first screw hole 111, and the mounting groove 112 is located above the first screw hole 111, and the two are connected. A connecting ring 4 is fixedly embedded in the mounting groove 112 for detachable connection with an external drilling tool.

[0050] In order to make holes in substrates 6 of different materials, the external hole-making tool is a manual wrench 5 or an electric screwdriver, whose drive end is engaged with or threaded into the connecting ring 4.

[0051] Preferably, the connecting ring 4 is an internal hexagonal metal ring, and the manual wrench 5 is an internal hexagonal manual wrench adapted to the connecting ring 4.

[0052] In this embodiment, the steps for using expansion bolts suitable for various substrates in substrate 6 are as follows:

[0053] Step 1: As Figure 5 As shown, the blade head 24 of the fastener 2 is pressed against the surface of the substrate 6 to be fixed. An external drilling tool is used to connect with the connecting ring 4. By rotating the base of the cylinder 11, the fastener 2 is rotated synchronously, so that the blade head 24 rotates on the surface of the substrate 6 to open the mounting hole 61 that matches the expansion bolt. Then the cylinder plate 12 is inserted into the mounting hole 61 until the base of the cylinder 11 presses against the top of the substrate 6.

[0054] Step 2: The screw 3 is inserted into the cylinder through the thread engagement with the first screw hole 111. The screw 3 moves along the guide groove 21. The fixing member 2 is flipped from the first position to the second position by the pushing force of the screw 3 until the screw 3 is accurately aligned and enters the second screw hole 22.

[0055] Step 3: As Figure 6 and Figure 7 As shown, screw 3 continues to be tightened. Screw 3 passes through the first thread and the second thread of the second screw hole 22 in sequence. When screw 3 enters the second thread, since the rotation direction of the second thread is opposite to the rotation direction of screw 3, as the tightening torque continues to increase, the two rotating shafts 13 break. Under the guidance of the cylindrical body 12, the fixing member 2 moves towards the base of the cylinder 11 along the longitudinal axis of the cylinder body, and finally the rubber layer of the fixing member 2 adheres to the substrate 6, thus completing the expansion and tightening of the expansion bolt.

[0056] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An expansion bolt suitable for various substrates, characterized in that, It includes a detachably connected bolt sleeve (1), a fastener (2), and a screw (3); The bolt cylinder (1) includes a cylinder body and a cylinder base (11) disposed at one end of the cylinder body. The cylinder body can pass through the mounting hole (61) of the substrate (6), and the cylinder base (11) has a first screw hole (111). The fixing member (2) is rotatably connected to the cylindrical part, the fixing member (2) can be rotated around the rotation connection point, and a second screw hole (22) is opened in the middle part of the fixing member (2) along its thickness direction; The fastener (2) has a first position and a second position; in the first position, the fastener (2) is parallel to the longitudinal axis of the cylindrical part; in the second position, the fastener (2) is perpendicular to the longitudinal axis of the cylindrical part. During the process of screwing the screw (3) into the first screw hole (111), the fixing member (2) can be driven to flip from the first position to the second position; then, after the screw (3) is screwed into the second screw hole (22), the fixing member (2) can be driven to move along the longitudinal axis of the cylinder portion toward the cylinder base (11) to fit against the substrate (6) so as to fix the substrate (6) between the cylinder base (11) and the fixing member (2).

2. The expansion bolt applicable to various substrates as described in claim 1, characterized in that: The cylindrical section includes two cylindrical plates (12) that are spaced apart and symmetrically arranged in the circumferential direction; The two cylindrical bodies (12) can penetrate the mounting holes (61) of the substrate (6), and the fastener (2) is disposed between the two cylindrical bodies (12). The cylindrical bodies (12) are used to guide the fastener (2) to rotate and move linearly along a predetermined path during the screw (3) tightening process.

3. The expansion bolt applicable to various substrates as described in claim 2, characterized in that: The cylindrical body also includes two rotating shafts (13); The two rotating shafts (13) are respectively fixed to the inner sides of the two cylindrical bodies (12) and are symmetrically arranged along the circumference of the cylindrical body. The axial direction of the rotating shaft (13) is perpendicular to the axial direction of the cylindrical body. The fixing member (2) has connecting holes (23) on both sides, and the rotating shaft (13) is inserted through the connecting holes (23) to form the rotating connection point.

4. The expansion bolt applicable to various substrates as described in claim 3, characterized in that: The base of the cylinder (11), the two cylindrical bodies (12), and the two rotating shafts (13) are integrally formed.

5. The expansion bolt applicable to various substrates as described in claim 3, characterized in that: The fixing member (2) is provided with a guide groove (21); The lower part of the guide groove (21) is a tapered hole structure, and its inner wall gradually slopes outward from top to bottom to form an inclined guide surface. The guide surface forms an angle with the central axis of the fixing member (2). When the screw (3) moves along the guide surface toward the second screw hole (22), the screw (3) can drive the fixing member (2) to rotate around the rotation axis (13) from the first position to the second position until the screw (3) enters the second screw hole (22).

6. The expansion bolt applicable to various substrates as described in claim 5, characterized in that: The second screw hole (22) has a first thread on the side near the guide groove (21) that is consistent with the thread direction of the screw (3), and a second thread on the side away from the guide groove (21) that is opposite to the thread direction of the screw (3). The screw (3) passes through the first thread and the second thread in sequence. When the screw (3) is screwed into the second thread, the two rotating shafts (13) break. The fixing member (2) moves along the longitudinal axis of the cylinder to the base (11) and fits against the substrate (6).

7. The expansion bolt applicable to various substrates as described in claim 5, characterized in that: The fixing member (2) has a rubber layer on one side of the guide groove (21), and the rubber layer can be attached to the substrate (6).

8. The expansion bolt applicable to various substrates as described in claim 5, characterized in that: The end of the fixing member (2) away from the guide groove (21) is provided with a cutting head (24); Before installing the screw (3), the fixing member (2) is rotated synchronously by rotating the base of the cylinder (11), so that the cutting head (24) rotates on the surface of the substrate (6) to open the mounting hole (61) that matches the expansion bolt.

9. The expansion bolt applicable to various substrates as described in claim 8, characterized in that: It also includes a connecting ring (4); The top of the cylindrical base (11) is provided with a mounting groove (112), which is coaxially arranged with the first screw hole (111). The diameter of the mounting groove (112) is larger than the diameter of the first screw hole (111). The mounting groove (112) is located above the first screw hole (111) and the two are connected. The connecting ring (4) is fixedly embedded in the mounting groove (112) for detachable connection with an external drilling tool.

10. The expansion bolt applicable to various substrates as described in claim 9, characterized in that: The external drilling tool is a manual wrench (5) or an electric screwdriver, the drive end of which is engaged or threaded with the connecting ring (4).

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