An expansion anchor that is easily removed

Abstract

This invention relates to the field of engineering component technology, specifically to an easily disassembled expansion anchor bolt, comprising a screw, an anchor bolt rod, a deformation sleeve, a support frame, and a nut. The anchor bolt rod is sleeved on one end of the screw and moves synchronously along its axial direction with the screw. Multiple expansion groups are fixedly arranged at intervals along the axial direction of the anchor bolt rod. Each expansion group includes a conical guide platform and a sleeve. The support frame includes multiple support rings and multiple support rods connecting the support rings. Multiple deformation sleeves are provided, corresponding one-to-one with the expansion groups and support rings, to form multiple fixed supports within the hole, resulting in more stable support and preventing rotational torque around the support position. Each deformation sleeve includes multiple arc plates distributed circumferentially around the anchor bolt rod. When the conical guide platform pushes the arc plates, the sleeve moves synchronously with the conical guide platform, causing the arc plates to continuously change their contact position with the sleeve as they deform, extending the overall service life.

Description

Technical Field

[0001] This invention relates to the field of engineering components technology, and more specifically to an expansion anchor bolt that is easy to disassemble. Background Technology

[0002] Expansion anchors, widely used in construction, decoration, and equipment installation, function primarily to achieve reliable anchoring by generating expansion and friction within a pre-drilled hole in the substrate. Traditional expansion anchors, such as wedge-shaped or sleeve-type expansion anchors, typically rely on a single cone or expansion element forcing a localized radial expansion of the expansion sleeve or anchor body as the anchor moves axially, thus pressing it against the hole wall.

[0003] However, this design, which relies on a single expansion support point, has an inherent technical drawback. When the anchor bolt is subjected to an external force perpendicular to its axis (such as shear force or vibration load), all the reaction forces will concentrate on that single expansion support point. This creates a rotational torque with that support point as the fulcrum, leading to the risk of the anchor bolt loosening or swaying. Especially under long-term dynamic or impact loads, the stability and safety of the anchoring will be significantly reduced. In addition, the high stress concentration at the expansion point can easily lead to plastic deformation or even damage to the expansion sleeve or the hole wall of the base material, affecting its reusability and long-term anchoring performance. Summary of the Invention

[0004] The present invention provides an expansion anchor bolt that is easy to disassemble, in order to solve the above-mentioned problems.

[0005] The present invention provides an easily disassembled expansion anchor bolt using the following technical solution:

[0006] An easily disassembled expansion anchor includes a threaded rod, an anchor rod, a deformation sleeve, a support frame, and a nut. The anchor rod is sleeved around one end of the threaded rod and parallel to it, and can move synchronously with the threaded rod along its axial direction. Multiple expansion assemblies are fixedly arranged at intervals along the axial direction of the anchor rod. Each expansion assembly includes a tapered guide platform and a clamp. The tapered guide platform is coaxial with the anchor rod, and its smaller end faces the threaded rod. The clamp is located on one side of the smaller end of the tapered guide platform and is spaced apart from it. The support frame includes multiple support rings and multiple support rods connecting the support rings. The support rings are coaxially sleeved. Outside the anchor bolt and corresponding to the expansion group, each support ring is located on the side of a sleeve away from the conical guide platform; there are multiple deformation sleeves, each corresponding to the expansion group, and each deformation sleeve includes multiple arc plates distributed circumferentially around the anchor bolt, the arc plates being made of elastic deformable material; multiple arc plates are all set between the sleeve and the anchor bolt, and at both ends of the anchor bolt in the axial direction, they abut against the conical surface of the conical guide platform and the support ring respectively; the nut is threadedly engaged with the screw, and when the screw is rotated to move axially, it abuts against one of the support rings to prevent the support frame from moving in the same direction as the screw.

[0007] Optionally, the diameter of the space enclosed by multiple support rods is smaller than the diameter of the sleeve, and each support rod passes through the gap between two adjacent arc plates and through the tapered guide platform; the outer diameter of the other support rings, except those that abut against the nut, is smaller than the diameter of the large end of the tapered guide platform.

[0008] Optionally, the relative position of the anchor bolt and the threaded rod in the axial direction is adjustable.

[0009] Optionally, each arc plate is provided with a half-cut slit along its axial direction, and one end of the half-cut slit passes through the end of the arc plate near its corresponding conical guide, in order to increase the opening angle of the arc plate when it is squeezed and deformed by the conical guide.

[0010] Optionally, a protrusion is provided on the side of the arc plate away from the anchor bolt.

[0011] Optionally, the sleeve is connected to the anchor bolt via multiple connecting rods, with each connecting rod located between two adjacent arc plates and separating the two arc plates.

[0012] Optionally, among the multiple support rings, the support ring located closest to the screw abuts against the nut, and the size of the support ring abutting against the nut is larger than the size of the other support rings.

[0013] Optionally, a polygonal hole is provided at the end of the screw away from the anchor bolt to allow for tool engagement during installation to restrict the rotation of the screw.

[0014] Optionally, the distance between the sleeve and its corresponding tapered guide plate is less than the length of the arc plate in the axial direction of the anchor bolt.

[0015] Optionally, the screw and the anchor bolt are threaded together.

[0016] The beneficial effects of this invention are as follows: The easily disassembled expansion anchor bolt of this invention forms multiple fixed supports at multiple positions within the hole by setting multiple corresponding expansion groups, multiple support rings, and multiple deformation sleeves, resulting in more stable support and eliminating rotational torque around the support position. Furthermore, when the conical guide pushes the arc plate, the end of the arc plate near the conical guide will deform around the contact position between the arc plate and the sleeve. By making the sleeve move synchronously with the conical guide, the contact position between the arc plate and the sleeve continuously changes during arc plate deformation, preventing fatigue damage caused by arc plate deformation around the same position, and also alleviating fatigue deformation of the sleeve, thus extending the overall service life. Moreover, when releasing the anchor, the synchronous movement of the sleeve with the anchor bolt rod assists the arc plate in restoring its deformation.

[0017] Furthermore, the relative position of the anchor bolt rod and the threaded rod in the axial direction is adjustable. By adjusting the position of the threaded rod relative to the anchor bolt rod, the threaded connection position of the nut and the threaded rod can be changed. When the threads at the threaded connection position of the threaded rod and the threaded rod wear or fail, the entire anchor bolt structure will not be scrapped. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the easily disassembled expansion anchor bolt of the present invention;

[0020] Figure 2 for Figure 1 Enlarged diagram of point A;

[0021] Figure 3 This is a schematic diagram showing the overall structure of an embodiment of an easily disassembled expansion anchor bolt according to the present invention.

[0022] Figure 4 This is a cross-sectional schematic diagram of the overall structure of an embodiment of an easily disassembled expansion anchor bolt according to the present invention;

[0023] Figure 5 This is a schematic diagram of the overall structure of an embodiment of the easily disassembled expansion anchor bolt of the present invention in the anchored state.

[0024] In the diagram: 100, screw rod; 200, anchor bolt rod; 210, tapered guide platform; 220, sleeve; 230, connecting rod; 300, deformation sleeve; 310, arc plate; 311, half-cut slit; 312, protrusion; 400, support frame; 410, support ring; 420, support rod; 500, nut. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] An embodiment of the present invention, namely an easily removable expansion anchor, is as follows: Figures 1 to 5 As shown, it includes a screw 100, an anchor bolt 200, a deformation sleeve 300, a support frame 400, and a nut 500.

[0027] Anchor bolt 200 is sleeved on one end of screw 100 and parallel to screw 100 and can move synchronously with screw 100 along its axial direction; multiple spreading groups are fixedly arranged at intervals along the axial direction of anchor bolt 200, each spreading group includes a tapered guide 210 and a sleeve 220, the tapered guide 210 is coaxial with anchor bolt 200 and the small end faces the screw 100; the sleeve 220 is located on the small end side of tapered guide 210 and is spaced apart from tapered guide 210.

[0028] The support frame 400 includes multiple support rings 410 and multiple support rods 420 connecting the multiple support rings 410; the support rings 410 are coaxially sleeved outside the anchor rods 200 and correspond one-to-one with the spreading group, and each support ring 410 is located on the side of a sleeve 220 away from the conical guide platform 210.

[0029] Multiple deformation sleeves 300 are present, each corresponding to a support assembly. Each deformation sleeve 300 includes multiple arc plates 310 spaced circumferentially around the anchor bolt 200. The arc plates 310 are made of an elastic, deformable material. Multiple arc plates 310 are positioned between the sleeve 220 and the anchor bolt 200, and their axial ends abut against the conical surface of the tapered guide 210 and the support ring 410, respectively. Specifically, the distance between the sleeve 220 and its corresponding tapered guide 210 is less than the axial length of the arc plate 310 on the anchor bolt 200. The nut 500 is threaded into the screw 100 and, when the screw 100 is rotated to move axially, it abuts against one of the support rings 410, preventing the support frame 400 from moving in the same direction as the screw 100.

[0030] During installation, the end of the anchor bolt 200 furthest from the screw 100 extends into the hole. While rotating the nut 500, a tool is used to restrict the screw 100 from rotating synchronously with the nut 500. This causes the screw 100 to move axially away from the hole, simultaneously moving the anchor bolt 200. At the same time, the nut 500 restricts the support frame 400 from moving away from the hole, causing the tapered guide 210 and the support ring 410 to approach each other, compressing the arc plate 310. The arc plate 310 then opens under the pushing force of the tapered surface of the tapered guide 210. The nut 500 is then released after rotating until the arc plate 310 is tightly against the sidewall of the hole, forming a self-locking thread with the screw 100, thus completing the anchoring. When disassembly is required, loosen nut 500 and tap screw 100 towards the hole, causing screw 100 to move anchor bolt 200 towards the hole, releasing the pressure of tapered guide plate 210 on arc plate 310, allowing arc plate 310 to return to its initial state and detach from the hole sidewall, thus releasing the anchor.

[0031] Existing expansion anchors typically expand and support at a single location. When subjected to an external force perpendicular to the anchor's axis, a rotational torque is generated around the support location, affecting the stability of the expansion anchor. This application addresses this by setting multiple corresponding expansion groups, multiple support rings 410, and multiple deformation sleeves 300 to form fixed supports at multiple locations within the hole. This provides more stable support and eliminates the rotational torque around the support location. Furthermore, when the tapered guide 210 pushes the arc plate 310, the end of the arc plate 310 near the tapered guide 210 deforms around the contact point between the arc plate 310 and the sleeve 220. By making the sleeve 220 and the tapered guide 210 move synchronously, the contact point between the arc plate 310 and the sleeve 220 continuously changes during deformation, preventing fatigue damage caused by deformation of the arc plate 310 around the same location. This also alleviates fatigue deformation of the sleeve 220 and extends the overall service life. Furthermore, when the anchor is released, the sleeve 220 moves synchronously with the anchor bolt 200, which can assist the arc plate 310 in restoring its deformation.

[0032] In this embodiment, the diameter of the space enclosed by the multiple support rods 420 is smaller than the diameter of the sleeve 220. Each support rod 420 passes through the gap between two adjacent arc plates 310 and through the conical guide platform 210. Except for the support rings 410 that abut against the nut 500, the outer diameter of the other support rings 410 is smaller than the diameter of the large end of the conical guide platform 210, so as to avoid the support rings 410 and support rods 420 affecting the anchoring effect of the arc plate 310 deformation. In actual processing, the anchor bolt rod 200 and its external conical guide platform 210 and sleeve 220 can be fixedly connected by welding. After the multiple support rods 420 pass through the conical guide platform 210, the separately set support rings 410 are fixed to the outside of the support rods 420 by welding.

[0033] In some other embodiments, the relative axial position of the anchor bolt 200 and the screw 100 is adjustable. Specifically, the screw 100 and the anchor bolt 200 are threaded together. By rotating the screw 100 relative to the anchor bolt 200, the length of the screw 100 extending beyond the anchor bolt 200 can be changed, thereby altering the threaded position of the nut 500 and the screw 100. This prevents the entire anchor bolt structure from becoming unusable if the threads at the threaded position of the nut 500 and the screw 100 wear or fail.

[0034] In this embodiment, each arc plate 310 is provided with a semi-cut slit 311 along its axial direction, and one end of the semi-cut slit 311 penetrates the arc plate 310 near the end of its corresponding conical guide 210, which is used to increase the opening angle of the arc plate 310 when it is squeezed and deformed by the conical guide 210.

[0035] In this embodiment, a protrusion 312 is provided on the side of the arc plate 310 away from the anchor bolt 200 to increase the friction between the arc plate 310 and the hole, thereby improving the stability of the anchoring.

[0036] In this embodiment, the sleeve 220 is connected to the anchor bolt 200 via multiple connecting rods 230, and each connecting rod 230 is located between two adjacent arc plates 310, separating the two arc plates 310. The connecting rods 230 located between the two arc plates 310 can also prevent impurities from entering the space between the arc plate 310 and the anchor bolt 200 from the gap between the two arc plates 310, thereby reducing the impact of impurities on the recovery deformation of the arc plate 310.

[0037] In this embodiment, among the multiple support rings 410, the support ring 410 located closest to the screw 100 abuts against the nut 500, and the size of the support ring 410 abutting against the nut 500 is larger than the size of the other support rings 410. During anchoring, the support ring 410 abutting against the nut 500 is used to fit against the end face of the hole, and its outer diameter must be larger than the diameter of the hole.

[0038] In this embodiment, the end of the screw 100 away from the anchor bolt 200 has a polygonal hole, which can be used with a tool to restrict the rotation of the screw 100 during installation. In some other embodiments, the end of the screw 100 may also be a square column to facilitate clamping and restricting its rotation with a tool.

[0039] In use, the easily disassembled expansion anchor of the present invention involves inserting the end of the anchor rod 200 away from the screw 100 into the hole, with the support ring 410 closest to the screw 100 abutting against the end face of the hole. While rotating the nut 500, a tool is used to engage with the polygonal hole at the end of the screw 100 to restrict its rotation, thereby causing the screw 100 to move axially away from the hole and simultaneously moving the anchor rod 200. During rotation, the nut 500 remains in contact with the support ring 410 located outside the hole, restricting the support frame 400 from moving away from the hole. This causes the conical guide 210 and the support ring 410 to approach each other, compressing the arc plate 310, which opens under the pushing force of the conical surface of the conical guide 210. The nut 500 is released after rotating until the arc plate 310 is tightly abutting against the side wall of the hole, forming a self-locking thread with the screw 100, thus completing the anchoring. When disassembly is required, loosen nut 500 and tap screw 100 towards the hole, causing screw 100 to move anchor bolt 200 towards the hole, releasing the pressure of tapered guide plate 210 on arc plate 310, allowing arc plate 310 to return to its initial state and detach from the hole sidewall, thus releasing the anchor.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An expandable anchor that facilitates disassembly, characterized by: Includes screws, anchor bolts, deformation sleeves, support frames, and nuts; An anchor bolt is sleeved on one end of a threaded rod and is parallel to the threaded rod, and can move synchronously with the threaded rod along its axial direction; multiple spreading groups are fixedly arranged at intervals along the axial direction of the anchor bolt, each spreading group including a tapered guide and a sleeve, the tapered guide is coaxial with the anchor bolt and the small end faces the threaded rod; the sleeve is located on the small end side of the tapered guide and is spaced apart from the tapered guide; The support frame includes multiple support rings and multiple support rods connecting the multiple support rings; the support rings are coaxially sleeved on the outside of the anchor bolt rods and correspond one-to-one with the spreading group, with each support ring located on the side of a sleeve away from the conical guide platform; There are multiple deformation sleeves, each corresponding to a support assembly. Each deformation sleeve includes multiple arc plates spaced circumferentially around the anchor bolt rod. The arc plates are made of elastic and deformable material. The multiple arc plates are all located between the sleeve and the anchor bolt rod, and their two ends in the axial direction of the anchor bolt rod abut against the conical surface of the tapered guide and the support ring, respectively. The nut is threaded with the screw rod and abuts against one of the support rings when the screw rod moves axially by rotation, preventing the support frame from moving in the same direction as the screw rod. The diameter of the space enclosed by multiple support rods is smaller than the diameter of the sleeve. Each support rod passes through the gap between two adjacent arc plates and through the conical guide. Except for the support rings that abut against the nut, the outer diameter of the other support rings is smaller than the diameter of the large end of the conical guide. Each arc plate has a half-cut along its axial direction, and one end of the half-cut passes through the end of the arc plate near its corresponding conical guide, which is used to increase the opening angle of the arc plate when it is squeezed and deformed by the conical guide. The distance between the sleeve and its corresponding tapered guide plate is less than the length of the arc plate in the axial direction of the anchor bolt. The sleeve is connected to the anchor bolt through multiple connecting rods, and each connecting rod is located between two adjacent arc plates and separates the two arc plates; When the conical guide pushes the arc plate, the end of the arc plate near the conical guide will deform around the contact position between the arc plate and the sleeve. By making the sleeve and the conical guide move synchronously, the contact position between the arc plate and the sleeve will continuously change as the arc plate deforms.

2. The easily disassembled expansion anchor bolt according to claim 1, characterized in that: The relative position of the anchor bolt and the threaded rod in the axial direction is adjustable.

3. The easily disassembled expansion anchor bolt according to claim 1, characterized in that: A protrusion is provided on the side of the arc plate away from the anchor bolt.

4. The easily disassembled expansion anchor bolt according to claim 1, characterized in that: Among the multiple support rings, the support ring closest to the screw abuts against the nut, and the size of the support ring abutting against the nut is larger than the size of the other support rings.

5. The easily disassembled expansion anchor bolt according to claim 1, characterized in that: The end of the screw away from the anchor bolt has a polygonal hole, which can be used with tools to restrict the rotation of the screw during installation.

6. An easily disassembled expansion anchor according to claim 2, characterized in that: The screw and the anchor bolt are threaded together.

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