Detachable rear expanded-base anchor bolt

Abstract

The utility model discloses a detachable rear underreamed anchor bolt, which comprises an anchoring part, an anchor rod, a connecting piece, a connecting piece and a connecting piece, wherein one section of the anchoring part is a screw rod; the expansion sleeve can be expanded in the radial direction, and the outer diameter of the expansion sleeve is matched with the anchoring part; the axial driving assembly is used for driving the expansion sleeve to expand in the radial direction; the pre-expansion assembly is used for driving the expansion sleeve to perform pre-expansion positioning in the hole; the locking assembly is used for locking or releasing the position of the expansion sleeve; by arranging the anchoring part, the expansion sleeve, the axial driving assembly, the pre-expansion assembly and the locking assembly, the anchoring part can be conveniently expanded in the mounting hole, when the anchoring part needs to be disassembled and replaced, expansion of the expansion sleeve can be relieved, then the anchoring part is pulled out, the anchoring part can drive the expansion sleeve to move, and when the expansion sleeve moves, the pre-expansion assembly is not required to be disassembled and replaced. The hole wall of the mounting hole extrudes the expansion sleeve, so that the expansion sleeve shrinks in the radial direction, and the anchoring part is taken out under the condition that the hole wall is not damaged.

Description

Technical Field

[0001] The utility model belongs to the technical field of anchor bolts, and in particular relates to a detachable rear-expanded bottom anchor bolt. Background Art

[0002] An anchor is a device used to fix and support a building or structure. It is usually made of metal and embedded in concrete or other building materials to provide additional support and stability. Anchors are widely used in construction, bridges, tunnels, retaining walls and other projects. They can effectively resist the effects of external forces such as wind and earthquakes to ensure the safety and stability of buildings.

[0003] However, existing anchor bolts are generally non-detachable. When the exposed screw of the anchor bolt is damaged or rusted, which affects its use, it is difficult to disassemble the anchor bolt. Forcibly removing the anchor bolt will damage the inner wall of the hole. It is only possible to drill a hole in another position to place a new anchor bolt for use, which is not very convenient. Summary of the invention

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions, a detachable rear bottom expansion anchor bolt, characterized in that it includes:

[0005] An anchor, wherein a section of the anchor is a screw;

[0006] an expansion sleeve, which can be radially expanded, and the outer diameter of the expansion sleeve matches the anchor;

[0007] An axial drive assembly, used for driving the expansion sleeve to radially expand or contract;

[0008] Pre-expansion assembly, used to drive the expansion sleeve to perform pre-expansion and positioning in the hole;

[0009] A locking assembly, used to lock or release the position of the expansion sleeve;

[0010] The axial drive assembly is fixedly arranged at one end of the anchor, the expansion sleeve is assembled on the anchor, and a locking assembly and a pre-expansion assembly are arranged between the axial drive assembly and the expansion sleeve.

[0011] Furthermore, the axial drive assembly comprises:

[0012] A conical rod, the conical rod is divided into a large end and a small end, the diameter of the small end of the conical rod is smaller than the diameter of the anchor, and the diameter of the large end of the conical rod is larger than the inner diameter of the expansion sleeve;

[0013] Among them, the small end of the cone rod is fixedly connected to the end face of the anchor away from the screw rod, the expansion sleeve is sleeved on the small end of the cone rod, and a plurality of grooves are opened on the circumferential outer surface of the expansion sleeve, and a plurality of the grooves are opened on the end face of the expansion sleeve close to the large end of the cone rod.

[0014] Further, the pre-expansion assembly comprises:

[0015] A locking block, wherein two locking blocks are fixedly arranged on the outer periphery of the small end of the tapered rod, and the two locking blocks are arranged diagonally at 180°;

[0016] Semicircular groove, the inner hole of the expansion sleeve is formed by two eccentric semicircular grooves, the two eccentric semicircular grooves respectively divide the cross section of the expansion sleeve into a thick section and a thin section, and the thin sections of the two eccentric semicircular grooves gradually transition to the thick section through the arc edge lines of the semicircular grooves;

[0017] A through groove, wherein the expansion sleeve is provided with a through groove, and the through groove is connected to the openings at both ends of the expansion sleeve;

[0018] There is a gap between the thinnest end of the thin section and the outer diameter of the small end of the cone rod, the thickest end of the thick section fits the outer diameter of the small end of the cone rod, and the locking block is located in the gap between the thinnest end of the thin section and the outer diameter of the small end of the cone rod.

[0019] Furthermore, it also includes:

[0020] Strip protrusions, the circumferential outer surface of the expansion sleeve is fixedly provided with a plurality of circumferentially distributed strip protrusions, and the strip protrusions are parallel to the cylindrical element line of the expansion sleeve;

[0021] A slotted groove is provided on the end face of the screw of the anchor.

[0022] Furthermore, the locking assembly comprises:

[0023] A convex block, wherein the inner wall of the expansion sleeve protrudes inward to form a convex block;

[0024] A limiting groove, wherein one of the locking blocks is provided with a limiting groove matching the protrusion;

[0025] Wherein, the protrusion is located in the limiting groove, and two ends of the protrusion are arranged to abut against two side walls of the limiting groove.

[0026] Furthermore, the strip-shaped protrusions are made of rubber.

[0027] Furthermore, the anchoring piece is provided with a plurality of hanging holes.

[0028] The beneficial effects of the utility model are:

[0029] 1. By providing an anchor, an expansion sleeve, an axial drive assembly, a pre-expansion assembly and a locking assembly, it is convenient to expand the anchor in the mounting hole. When the anchor needs to be disassembled and replaced, the expansion sleeve can be released, and then the anchor can be pulled out, so that the anchor can drive the expansion sleeve to move. When the expansion sleeve moves, the wall of the mounting hole squeezes the expansion sleeve to make the expansion sleeve radially shrink, so that the anchor can be taken out without damaging the hole wall.

[0030] 2. By setting up the tapered rod, it is convenient to open the expansion sleeve. At the same time, the shape and position of the tapered rod enable the locking assembly to lock the position between the expansion sleeve and the anchor. When the anchor is pulled out, the expansion sleeve can be radially contracted to a size matching the mounting hole as it moves and is squeezed, making it convenient to remove the utility model without damaging the mounting hole.

[0031] 3. By providing a locking block, a semicircular groove and an open groove, the expansion sleeve can be expanded by cooperation, thereby pre-tightening the expansion sleeve in the installation hole and positioning the expansion sleeve.

[0032] 4. By providing a strip-shaped protrusion, it is convenient to place the expansion sleeve in the mounting hole. At the same time, the strip-shaped protrusion is parallel to the cylindrical line of the expansion sleeve, thereby increasing the friction between the expansion sleeve and the mounting hole, thereby preventing relative rotation between the expansion sleeve and the mounting hole, and facilitating the implementation of the above-mentioned embodiment. At the same time, a slot is provided on the screw rod. When the anchor needs to be twisted for pre-tensioning, the anchor can be twisted by cooperating with the tool and the slot, making it easier to twist the anchor.

[0033] 5. By providing the protrusion and the limiting groove, the locking state between the anchor and the expansion sleeve can be switched while the pre-expansion assembly is performing / releasing pre-expansion.

[0034] 6. Since the strip-shaped protrusion is made of rubber, it has the ability to deform, and will not damage the mounting hole due to rigid contact when inserted into the mounting hole. At the same time, the strip-shaped protrusion is parallel to the cylindrical element line of the expansion sleeve, which also makes the resistance when inserted into the mounting hole small, but the rotation resistance in the mounting hole is large. After insertion, the strip-shaped protrusion will have a certain friction with the mounting hole through the resilience of the deformation, which facilitates the implementation of the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Attached Figure 1 It is a structural diagram of the utility model;

[0036] Attached Figure 2 The structural diagram of the anchor;

[0037] Attached Figure 3 This is a structural diagram of the expansion sleeve;

[0038] Attached Figure 4 It is a front view of the utility model;

[0039] Attached Figure 5 For attachment Figure 4 Schematic cross-sectional view of AA in the figure;

[0040] Attached Figure 6 For attachment Figure 4 A schematic cross-sectional view of the middle BB;

[0041] Attached Figure 7 It is a schematic diagram of the steps of anchoring the utility model in the installation hole;

[0042] Attached Figure 8 It is a schematic diagram of the steps of removing the utility model from the installation hole;

[0043] Explanation of the reference numerals: 1. Anchor, 2. Screw, 3. Expansion sleeve, 4. Conical rod, 5. Slot, 6. Locking block, 7. Semicircular groove, 8. Through groove, 9. Strip protrusion, 10. Slot, 11. Boss, 12. Limiting groove, 13. Hanging hole, 14. Shoulder, 15. Expansion sheet, 16. Thick section, 17. Thin section. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work belong to the scope of protection of the present application. In the description of the present application, it should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and devices known to ordinary technicians in the relevant fields may not be discussed in detail, but in appropriate cases, the techniques, methods and devices should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of the exemplary embodiments may have different values, and it should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0045] Embodiment 1:

[0046] This embodiment provides a detachable rear bottom-enlarged anchor bolt, comprising:

[0047] An anchor 1, a section of the anchor 1 is a screw 2;

[0048] An expansion sleeve 3, which can be radially expanded, and the outer diameter of the expansion sleeve 3 matches the anchor 1;

[0049] An axial drive assembly, used to drive the expansion sleeve 3 to radially expand or contract;

[0050] A pre-expansion assembly, used to drive the expansion sleeve 3 to perform pre-expansion and positioning in the hole;

[0051] A locking assembly, used to lock or release the position of the expansion sleeve 3;

[0052] The axial drive assembly is fixedly arranged at one end of the anchor 1 , the expansion sleeve 3 is assembled on the anchor 1 , and a locking assembly and a pre-expansion assembly are arranged between the axial drive assembly and the expansion sleeve 3 .

[0053] In the technical solution, the anchor 1 is a slender rod with two screw sections, and a shoulder 14 is formed between the anchor 1 and the axial drive assembly. The expansion sleeve 3 is sleeved on the axial drive assembly, and the outer ring diameter of the expansion sleeve 3 matches the diameter of the anchor 1. One end of the expansion sleeve 3 is in conflict with the shoulder 14 of the anchor 1. The expansion sleeve 3 is made of a deformable metal (such as steel) and is plastically deformable or has a rebound characteristic. The axial drive assembly is used to drive the expansion sleeve 3 to radially expand or contract in the mounting hole.

[0054] When anchoring is required, a mounting hole matching the anchor 1 is opened on the wall, the mounting hole is formed by drilling or other means, and the end of the anchor 1 away from the end of the screw 2 is placed into the mounting hole, and the expansion sleeve 3, the axial drive component, the pre-expansion component and the locking component are all placed into the mounting hole;

[0055] When one end of the anchor 1 enters the mounting hole, the expansion sleeve 3 can be pushed into the mounting hole by the contact between the shaft shoulder 14 and the expansion sleeve 3, and the position of the expansion sleeve 3 can be locked by the cooperation of the locking assembly to prevent the expansion sleeve 3 from shaking, axially moving or radially rotating on the anchor 1 when it is not tightened;

[0056] After one end of the anchor 1 is completely inserted into the mounting hole, the fixing restriction of the expansion sleeve 3 is released by the locking assembly, and then the expansion sleeve 3 is slightly expanded in the hole by the pre-expansion assembly, so that the position of the expansion sleeve 3 is positioned by the friction between the outer wall of the expansion sleeve 3 and the inner wall of the mounting hole;

[0057] After the expansion sleeve 3 is slightly expanded and tightened in the installation hole by the pre-expansion component, the expansion sleeve 3 is radially expanded in the hole by the axial driving component, thereby anchoring the anchor 1 in the installation hole of the wall;

[0058] When the anchor 1 needs to be removed, the cooperation between the axial drive component and the expansion sleeve 3 is released, and then the pre-expansion of the expansion sleeve 3 by the pre-expansion component is released. At this time, if the expansion sleeve 3 has a rebound characteristic, it will rebound partially due to the rebound characteristic. If the expansion sleeve 3 is plastically deformable, it will remain in the expanded state, and then the position of the expansion sleeve 3 is locked on the anchor 1 through the locking component. Then the anchor 1 is pulled out, and the anchor 1 can drive the expansion sleeve 3 to move. When the expansion sleeve 3 moves, the wall of the mounting hole squeezes the expansion sleeve 3 to make the expansion sleeve 3 radially shrink, so that the anchor 1 is removed without damaging the hole wall.

[0059] Through this structural design, by providing the anchor 1, the expansion sleeve 3, the axial drive assembly, the pre-expansion assembly and the locking assembly, it is convenient to expand the anchor 1 in the mounting hole. When the anchor 1 needs to be disassembled and replaced, the expansion sleeve 3 can be released, and then the anchor 1 can be pulled out, so that the anchor 1 can drive the expansion sleeve 3 to move. When the expansion sleeve 3 moves, the wall of the mounting hole squeezes the expansion sleeve 3 to make the expansion sleeve 3 radially shrink, so that the anchor 1 can be taken out without damaging the hole wall.

[0060] Embodiment 2:

[0061] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0062] Furthermore, the axial drive assembly comprises:

[0063] A conical rod 4, wherein the conical rod 4 is divided into a large end and a small end, wherein the diameter of the small end of the conical rod 4 is smaller than the diameter of the anchor 1, and the diameter of the large end of the conical rod 4 is larger than the inner diameter of the expansion sleeve 3;

[0064] Among them, the small end of the tapered rod 4 is fixedly connected to the end face of the anchor 1 away from the screw rod 2, the expansion sleeve 3 is sleeved on the small end of the tapered rod 4, and a plurality of grooves 5 are opened on the circumferential outer surface of the expansion sleeve 3, and a plurality of the grooves 5 are opened on the end face of the expansion sleeve 3 close to the large end of the tapered rod 4.

[0065] In the present technical solution, since the axial driving component is a tapered rod 4, the diameter of the small end of the tapered rod 4 is smaller than the diameter of the anchor 1, the diameter of the large end of the tapered rod 4 is larger than the inner diameter of the expansion sleeve 3, and the expansion sleeve 3 is sleeved on the small end of the tapered rod 4, and a plurality of slots 5 are provided through the circumferential outer surface of the expansion sleeve 3, and the plurality of slots 5 are provided on the end surface of the expansion sleeve 3 close to the large end of the tapered rod 4;

[0066] A plurality of slots 5 divide the outer periphery of the expansion sleeve 3 into a plurality of expansion pieces 15, and the expansion pieces 15 are arranged toward the large end of the cone rod 4;

[0067] After one end of the anchor 1 is completely inserted into the mounting hole, the fixing restriction of the expansion sleeve 3 is released by the locking assembly, and then the expansion sleeve 3 is slightly expanded in the hole by the pre-expansion assembly, so that the position of the expansion sleeve 3 is positioned by the friction between the outer wall of the expansion sleeve 3 and the inner wall of the mounting hole;

[0068] After the expansion sleeve 3 is slightly expanded and tightened in the installation hole by the pre-expansion assembly, the anchor 1 is pulled by a tool, so that the anchor 1 drives the cone rod 4 to move. At this time, the shaft shoulder 14 of the anchor 1 is away from one end of the expansion sleeve 3, and the large end of the cone rod 4 gradually moves toward the expansion piece 15 at the other end of the expansion sleeve 3. As the cone rod 4 moves, the large end of the cone rod 4 enters the inner hole of the expansion sleeve 3. The expansion sleeve 3 will gradually expand radially due to the contact with the cone rod 4, so that the anchor 1 is anchored in the installation hole;

[0069] When the anchor 1 needs to be removed, the end face of the screw rod 2 of the anchor 1 is knocked inward from the outside, thereby knocking the anchor 1 inward. At this time, the shoulder 14 of the anchor 1 is close to one end of the expansion sleeve 3, and the large end of the cone rod 4 gradually moves away from the expansion sheet 15 at the other end of the expansion sleeve 3;

[0070] Then, the pre-expansion of the expansion sleeve 3 by the pre-expansion component is released. At this time, if the expansion sleeve 3 has a rebound characteristic, it will rebound a part by the rebound characteristic. If the expansion sleeve 3 is plastically deformable, it will remain in the expanded state. Then, the position of the expansion sleeve 3 is locked on the anchor 1 by the locking component, so as to ensure that when the anchor 1 moves next, it can drive the expansion sleeve 3 to move without causing the cone rod 4 to move toward the expansion sleeve 3. After the locking component locks the position between the expansion sleeve 3 and the anchor 1, the expansion sleeve 3 and the cone rod 4 can move synchronously.

[0071] Since the small end of the tapered rod 4 is fixedly connected to the end of the anchor 1 away from the screw rod 2, the expanded expansion sleeve 3 will also be in the shape of the tapered rod 4, so that when the anchor 1 is pulled out, the small end of the expansion sleeve 3 will first contact the inner wall of the mounting hole. Therefore, in the process of pulling the anchor 1 out of the mounting hole, the inner wall of the mounting hole gradually transitions from squeezing the small end of the expansion sleeve 3 to squeezing the large end of the expansion sleeve 3, so that the expansion sleeve 3 radially shrinks to a size matching the mounting hole as it moves and is squeezed, thereby removing the anchor 1.

[0072] Through this structural design, by setting the tapered rod 4, it is convenient to stretch out the expansion sleeve 3. At the same time, the shape and position of the tapered rod 4 also enable the locking assembly to lock the position between the expansion sleeve 3 and the anchor 1. When the anchor 1 is pulled out, the expansion sleeve 3 can be radially contracted to a size matching the mounting hole as it moves and is squeezed, making it convenient to remove the utility model without damaging the mounting hole.

[0073] Embodiment 3:

[0074] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0075] Further, the pre-expansion assembly comprises:

[0076] A locking block 6, wherein two locking blocks 6 are fixedly arranged on the outer periphery of the small end of the tapered rod 4, and the two locking blocks 6 are arranged diagonally at 180°;

[0077] Semicircular groove 7, the inner hole of the expansion sleeve 3 is formed by two eccentric semicircular grooves 7, the two eccentric semicircular grooves 7 respectively divide the cross section of the expansion sleeve 3 into a thick section 16 and a thin section 17, and the thin sections 17 of the two eccentric semicircular grooves 7 gradually transition to the thick section 16 through the arc edge line of the semicircular groove 7;

[0078] A through groove 8 is provided on the expansion sleeve 3, and the through groove 8 is connected to the openings at both ends of the expansion sleeve 3;

[0079] There is a gap between the thinnest end of the thin section 17 and the outer diameter of the small end of the cone rod 4, the thickest end of the thick section 16 fits the outer diameter of the small end of the cone rod 4, and the locking block 6 is located in the gap between the thinnest end of the thin section 17 and the outer diameter of the small end of the cone rod 4.

[0080] In the present technical solution, after entering the installation hole, when the expansion sleeve 3 needs to be pre-tensioned, the anchor 1 is twisted, and the anchor 1 rotates to drive the locking block 6 to rotate, and the locking block 6 gradually moves toward the thick section 16 of the semicircular groove 7. Since there is a gap between the thinnest end of the thin section 17 and the outer diameter of the small end of the cone rod 4, the thickest end of the thick section 16 fits the outer diameter of the small end of the cone rod 4, so that when the locking block 6 moves from the position of the thin section 17 to the position of the thick section 16, due to the insufficient gap between the thick section 16 and the cone rod 4, as the locking block 6 moves, the thick section 16 will be pushed outward due to the resistance, thereby pushing the expansion sleeve 3 open, thereby pre-tightening the expansion sleeve 3 in the installation hole, and by providing the through groove 8, it is also convenient for the expansion sleeve 3 to be stretched open, avoiding the expansion sleeve 3 from bursting;

[0081] When releasing the pre-tension, the anchor 1 is rotated in the opposite direction to drive the locking block 6 to move and reset toward the thin section 17, so that a gap exists between the thick section 16 and the tapered rod 4, so that the expansion sleeve 3 can be radially contracted when the anchor 1 is removed.

[0082] Through this structural design, by providing the locking block 6, the semicircular groove 7 and the slot 5, it is convenient to expand the expansion sleeve 3 through cooperation, so that the expansion sleeve 3 is pre-tightened in the installation hole, thereby positioning the expansion sleeve 3.

[0083] Embodiment 4:

[0084] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0085] Furthermore, it also includes:

[0086] Strip protrusions 9, the circumferential outer surface of the expansion sleeve 3 is fixedly provided with a plurality of circumferentially distributed strip protrusions 9, and the strip protrusions 9 are parallel to the cylindrical element line of the expansion sleeve 3;

[0087] A slot 10 is provided on the end surface of the screw rod 2 of the anchor 1 .

[0088] In the present technical solution, a strip protrusion 9 is provided to facilitate the expansion sleeve 3 to be located in the mounting hole. At the same time, the strip protrusion 9 is parallel to the cylindrical line of the expansion sleeve 3, thereby increasing the friction between the expansion sleeve 3 and the mounting hole, thereby preventing relative rotation between the expansion sleeve 3 and the mounting hole, and facilitating the implementation of the above-mentioned embodiment. At the same time, a slot 10 is provided on the screw rod 2. When the anchor 1 needs to be twisted for pre-tensioning, the anchor 1 can be twisted by using a tool in cooperation with the slot 10, which makes twisting the anchor 1 more labor-saving.

[0089] Embodiment 5:

[0090] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0091] Furthermore, the locking assembly comprises:

[0092] A bump 11, the inner wall of the expansion sleeve 3 protrudes inward to form a bump 11;

[0093] A limiting groove 12, wherein one of the locking blocks 6 is provided with a limiting groove 12 matching the protrusion 11;

[0094] The protrusion 11 is located in the limiting groove 12 , and two ends of the protrusion 11 are disposed in contact with two side walls of the limiting groove 12 .

[0095] In the present technical solution, by providing the protrusion 11 and the limiting groove 12, when pre-tensioning is not performed, the protrusion 11 is located in the limiting groove 12 of the locking block 6. Since the two ends of the protrusion 11 are arranged to abut against the two side walls of the limiting groove 12, the anchor 1 can drive the expansion sleeve 3 to move synchronously regardless of whether it moves inward or outward in the mounting hole through the cooperation of the protrusion 11 and the limiting groove 12.

[0096] If locking restriction is required, pre-tensioning can be performed according to the implementation method of Example 3. As the cone rod 4 and the expansion sleeve 3 rotate relative to each other, the locking block 6 is driven to move, and the locking block 6 drives the limiting groove 12 to move, so that the protrusion 11 on the expansion sleeve 3 is disengaged from the limiting groove 12 of the locking block 6 on the cone rod 4, thereby releasing the locking restriction of the expansion sleeve 3, and the expansion sleeve 3 can be subsequently operated, pre-tensioned or expanded by moving the cone rod 4;

[0097] When the utility model needs to be taken out, the anchor 1 is knocked inwardly so that the shoulder 14 of the anchor 1 moves toward the expansion sleeve 3. After the shoulder 14 of the anchor 1 contacts one end of the expansion sleeve 3, the positions of the limiting groove 12 and the protrusion 11 on the radial section will also correspond. Then the anchor 1 is rotated to drive the locking block 6 to reset so that the protrusion 11 re-enters the limiting groove 12 of the locking block 6. The two ends of the protrusion 11 contact the two side walls of the limiting groove 12, so that the anchor 1 can be pulled to drive the expansion sleeve 3 to move outward synchronously.

[0098] Through this structural design, by providing the protrusion 11 and the limiting groove 12, while performing / releasing pre-expansion through the pre-expansion component, it can play a role in switching the locking state between the anchor 1 and the expansion sleeve 3.

[0099] Embodiment 6:

[0100] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0101] Furthermore, the strip-shaped protrusions 9 are made of rubber.

[0102] In the present technical solution, since the strip-like protrusion 9 is made of rubber material, it has the ability to deform, and will not damage the mounting hole due to rigid contact when inserted into the mounting hole. At the same time, the strip-like protrusion 9 is parallel to the cylindrical line of the expansion sleeve 3, which also makes the resistance small when inserted into the mounting hole, but the rotation resistance in the mounting hole is large. After insertion, the strip-like protrusion 9 will have a certain friction with the mounting hole through the resilience of the deformation, which facilitates the implementation of the above embodiment.

[0103] Embodiment 7:

[0104] This embodiment provides a detachable rear-enlarged bottom anchor bolt, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0105] Furthermore, a plurality of hanging holes 13 are formed through the anchor 1 .

[0106] With this structural design, by providing the hanging hole 13 , after the anchor 1 is anchored in the mounting hole, it can also be hung through the exposed hanging hole 13 , thereby increasing practicality.

[0107] The following is combined with Figure 7 And attached Figure 8 The steps of anchoring the utility model in the mounting hole and removing it from the mounting hole are described;

[0108] The steps of anchoring the utility model in the installation hole are as follows: Figure 7 As shown:

[0109] Step 1, insert the anchor end of the anchor into the mounting hole;

[0110] Step 2, twisting the screw to pre-tighten the expansion sleeve and release the lock of the expansion sleeve;

[0111] Step 3, pull the anchor outward to drive the cone rod to move, so that the expansion sleeve can be radially expanded through cooperation to complete the anchoring.

[0112] The steps of removing the utility model from the mounting hole are as follows: Figure 8 As shown:

[0113] Step 1, the utility model is in an anchoring state;

[0114] Step 2, tap the screw inwards to make the tapered rod disengage from the expansion sleeve;

[0115] Step 3, twisting the screw in the opposite direction to release the pre-tightening of the expansion sleeve and lock the expansion sleeve at the same time, so that the expansion sleeve is locked on the tapered rod;

[0116] Step 4-5, pull the screw rod outward to drive the expansion sleeve to move outward, and as the installation hole squeezes the expansion sleeve, the expansion sleeve contracts radially, thereby taking out the utility model.

[0117] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the specification of the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A detachable rear bottom anchor bolt, characterized in that: Included are: An anchor (1), wherein a section of the anchor (1) is a screw (2); An expansion sleeve (3) which can be radially expanded, and the outer diameter of the expansion sleeve (3) matches the anchor (1); An axial drive assembly, used for driving the expansion sleeve (3) to radially expand or contract; A pre-expansion assembly, used to drive the expansion sleeve (3) to perform pre-expansion and positioning in the hole; A locking assembly, used to lock or release the position of the expansion sleeve (3); The axial drive assembly is fixedly arranged at one end of the anchor (1), the expansion sleeve (3) is assembled on the anchor (1), and a locking assembly and a pre-expansion assembly are arranged between the axial drive assembly and the expansion sleeve (3).

2. A detachable rear bottom anchor bolt according to claim 1, characterized in that: The axial drive assembly comprises: A conical rod (4), the conical rod (4) being divided into a large end and a small end, the diameter of the small end of the conical rod (4) being smaller than the diameter of the anchor (1), and the diameter of the large end of the conical rod (4) being larger than the inner diameter of the expansion sleeve (3); The small end of the conical rod (4) is fixedly connected to the end face of the anchor (1) away from the screw rod (2), the expansion sleeve (3) is sleeved on the small end of the conical rod (4), and a plurality of slots (5) are provided through the circumferential outer surface of the expansion sleeve (3), and a plurality of the slots (5) are opened on the end face of the expansion sleeve (3) close to the large end of the conical rod (4).

3. A detachable rear bottom anchor bolt according to claim 2, characterized in that: The pre-expansion assembly comprises: A locking block (6), wherein two locking blocks (6) are fixedly arranged on the outer periphery of the small end of the tapered rod (4), and the two locking blocks (6) are arranged diagonally at 180°; Semicircular grooves (7), the inner hole of the expansion sleeve (3) is formed by two eccentric semicircular grooves (7), the two eccentric semicircular grooves (7) respectively divide the cross section of the expansion sleeve (3) into a thick section (16) and a thin section (17), and the thin sections (17) of the two eccentric semicircular grooves (7) gradually transition to the thick section (16) through the arc edge lines of the semicircular grooves (7); A through groove (8), the expansion sleeve (3) is provided with a through groove (8), and the through groove (8) is connected to the openings at both ends of the expansion sleeve (3); There is a gap between the thinnest end of the thin section (17) and the outer diameter of the small end of the tapered rod (4), the thickest end of the thick section (16) fits the outer diameter of the small end of the tapered rod (4), and the locking block (6) is located in the gap between the thinnest end of the thin section (17) and the outer diameter of the small end of the tapered rod (4).

4. A detachable rear bottom anchor bolt according to claim 3, characterized in that: Also includes: Strip-shaped protrusions (9), wherein the circumferential outer surface of the expansion sleeve (3) is fixedly provided with a plurality of circumferentially distributed strip-shaped protrusions (9), and the strip-shaped protrusions (9) are parallel to the cylindrical element line of the expansion sleeve (3); A slot (10) is formed on the end surface of the screw rod (2) of the anchor member (1).

5. A detachable rear bottom anchor bolt according to claim 4, characterized in that: The locking assembly comprises: A convex block (11), wherein the inner wall of the expansion sleeve (3) protrudes inwards to form a convex block (11); A limiting groove (12), wherein one of the locking blocks (6) is provided with a limiting groove (12) matching the protrusion (11); The protrusion (11) is located in the limiting groove (12), and the two ends of the protrusion (11) are arranged to abut against the two side walls of the limiting groove (12).

6. A detachable rear bottom anchor bolt according to claim 4, characterized in that: The strip-shaped protrusion (9) is made of rubber.

7. A detachable rear bottom anchor bolt according to any one of claims 1 to 6, characterized in that: The anchor piece (1) is provided with a plurality of hanging holes (13).

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