Anti-loosening expanded-base anchor bolt and mounting method

Abstract

The invention discloses an anti-loosening expanded-base anchor bolt and a mounting method. The anti-loosening expanded-base anchor bolt comprises a screw rod; a sleeve; the small end of the expansion cone is fixedly connected with one end of the screw rod through a neck structure, and the sleeve is arranged on the neck structure in a sleeving mode; the lower end of the sleeve is provided with a plurality of first locking keys which are arranged at intervals; the outer side of the expansion cone is fixedly connected with a plurality of second locking keys which are arranged at intervals; the lower end of the sleeve is provided with a plurality of stop guide driving keys which are arranged at intervals, the plurality of stop guide driving keys correspond to the plurality of second locking keys, and after the second locking keys are expanded, a structure similar to barbs is formed, so that the overall friction force of the anchor bolt is increased; the barb structure is arranged on the anchor bolt, so that the barb structure forms more friction between the anchor bolt and a base material, the fixing force is enhanced, and meanwhile, the anchor bolt can be effectively prevented from loosening or being pulled out when being pulled or vibrated.

Description

Technical Field

[0001] The invention belongs to the technical field of anchor bolts, and in particular relates to an anti-loosening bottom-expanding anchor bolt. Background Art

[0002] Anchor bolts are metal fasteners used to secure structures or equipment to foundations. Commonly used in the construction and engineering fields, they are embedded in concrete, stone or other solid materials and provide a stable fixing force through bolts, nuts or other fasteners.

[0003] In actual use, since the lock keys of the anchor bolts expand in one direction, their anti-seismic ability is poor. When some equipment is working, vibrations will occur, and the vibrations will be transmitted to the anchor bolts. After long-term use, the long-term vibrations will cause the anchor bolts to loosen, affecting their use. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an anti-loosening bottom expansion anchor bolt, comprising:

[0005] A screw having a cylindrical rod with threads formed on its outer surface;

[0006] A sleeve, which is in the shape of a hollow cylinder;

[0007] The expansion cone is a cone, the small end of the expansion cone is fixedly connected to one end of the screw through a neck structure, the sleeve is sleeved on the neck structure, and the neck structure is a cylinder;

[0008] A first locking key, wherein the lower end of the sleeve has a plurality of first locking keys arranged at intervals, and the first locking keys are in the shape of a sheet;

[0009] Second locking keys, a plurality of second locking keys arranged at intervals are fixedly connected to the outer side of the expansion cone, the second locking keys are also sheet-shaped, and the inner side surface of the second locking keys forms an angle with the outer side surface of the expansion cone;

[0010] A stop guide driving key, wherein the lower end of the sleeve has a plurality of stop guide driving keys arranged at intervals, wherein the plurality of stop guide driving keys correspond to the plurality of second lock keys, and are used to drive the plurality of second lock keys to expand outward, wherein the stop guide driving key is also in the shape of a sheet, and the length of the stop guide driving key is shorter than the length of the first lock key;

[0011] When the expansion cone is pulled between a plurality of first locking keys, the expansion cone drives the first locking keys of the sleeve to expand radially.

[0012] Furthermore, a limiting structure is included for limiting the rotation between the sleeve and the neck structure, and the limiting structure includes:

[0013] A limiting surface, which is a plane and is provided on the expansion cone and the neck structure. The number of the limiting surfaces corresponds to the number of second locking keys, and a plurality of second locking keys are respectively located on a plurality of limiting surfaces;

[0014] Among them, the inner ring of the sleeve matches the outer contour of the neck structure, the inner side surface of the stop guide drive key is a plane, and the inner side surface of the stop guide drive key cooperates with the limiting surface to play a guiding effect.

[0015] Furthermore, there is an opening between the second lock key and the limiting surface, the opening is formed by the angle between the inner side surface of the second lock key and the outer side surface of the expansion cone, and the opening is arranged toward the stop guide driving key;

[0016] When a plurality of the stop guide driving keys are pulled into openings between a plurality of second locking keys and the limiting surface, the stop guide driving keys drive the second locking keys to expand radially.

[0017] Furthermore, it also includes:

[0018] Triangular blocks, the outer surface of the first lock key has a plurality of triangular blocks spaced apart from each other;

[0019] Wherein, the protrusion of the triangular block is arranged close to the sleeve.

[0020] Furthermore, it also includes:

[0021] The dividing groove is formed on the triangular block and is used to divide the triangular block into several pieces.

[0022] Furthermore, it also includes:

[0023] A stop shoulder, wherein the neck structure is provided with a stop shoulder, which is used to stop the displacement of the sleeve;

[0024] Wherein, the upper end of the sleeve is arranged to abut against the lower end of the shoulder.

[0025] Furthermore, it also includes:

[0026] A deformation groove is formed on the outer surface of the first lock key, and the deformation groove is located at the connection between the first lock key and the sleeve.

[0027] Furthermore, a chamfer is provided on one side of the stop guide driving key facing the opening.

[0028] Furthermore, the installation method of the anti-loosening bottom expansion anchor bolt includes the following steps:

[0029] S1. Drill holes on the installation base to ensure that the hole diameter, hole depth and verticality meet the specification requirements;

[0030] S2. Clean the particles and dust in the hole;

[0031] S3, expanding the bottom of the hole;

[0032] S4. Clean the particles and dust in the hole after the bottom expansion;

[0033] S5, inserting the expansion cone of the anti-loosening bottom expansion anchor bolt into the hole as an insertion section, so that the expansion cone and the sleeve reach the bottom of the hole;

[0034] S6. Place a gasket, a washer and a nut on the screw of the anti-loosening bottom expansion anchor bolt in sequence, screw in the nut to push the gasket and the washer to move, so that the gasket contacts the installation base surface;

[0035] S7. Tighten the nut with a wrench to drive the screw of the anti-loosening bottom expansion anchor bolt to move upward, thereby driving the expansion cone to move upward relative to the sleeve;

[0036] S8, after the expansion cone of the anti-loosening bottom expansion anchor bolt moves upward relative to the sleeve, the first lock key of the sleeve cooperates with the expansion cone and is expanded first;

[0037] S9, when the first lock key of the anti-loosening bottom expansion anchor bolt expands to a certain extent but not completely, the stop guide driving key will expand the second lock key due to the continued upward movement of the expansion cone relative to the sleeve, forming a barb structure;

[0038] S10, after the first lock key and the second lock key of the anti-loosening bottom expansion anchor bolt are expanded, the anchoring is completed;

[0039] S11. Unscrew the nut in the opposite direction, take out the washer and gasket, and then install the screw rod of the anti-loosening bottom anchor bolt into the anchored component.

[0040] Furthermore, after the stopping guide driving key of the anti-loosening bottom expansion anchor bolt has expanded the second locking key through cooperation, the lower end of the stopping guide driving key of the anti-loosening bottom expansion anchor bolt will interfere with the inside of the second locking key, thereby playing a stopping role and preventing the expansion cone of the anti-loosening bottom expansion anchor bolt from continuing to move upward relative to the sleeve.

[0041] The beneficial effects of the present invention are:

[0042] 1. After the second lock key expands, a barb-like structure is formed, which increases the overall friction of the anchor bolt, so that the barb structure forms more friction between the anchor bolt and the base material, enhancing the fixing force. At the same time, it can effectively prevent the anchor bolt from loosening or pulling out when subjected to tension or vibration, providing stronger pull-out resistance. The barb structure helps to form a more stable anchor point in the base surface, thereby improving the stability of the overall structure.

[0043] 2. The limiting surface prevents the sleeve from rotating on the neck structure, so that after the sleeve is installed on the neck structure, the first lock key of the sleeve will correspond to the conical surface of the expansion cone, and the stop guide drive key of the sleeve will correspond to the limiting surface. A second lock key is arranged on the limiting surface to facilitate the stop guide drive key of the sleeve to correspond to the second lock key, so that the setting of the limiting surface also plays a positioning role. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Attached Figure 1 It is a structural diagram of the present invention;

[0045] Attached Figure 2 This is a structural diagram of the neck structure;

[0046] Attached Figure 3 is a cross-sectional view of the neck structure;

[0047] Attached Figure 4 The structural diagram of the triangular block of the first lock key after being divided by the dividing groove;

[0048] Attached Figure 5 This is a structural diagram of the present invention after anchoring;

[0049] Attached Figure 6 For attachment Figure 5 Front view of

[0050] Explanation of the reference numerals: 1. Screw, 2. Sleeve, 3. Expansion cone, 4. Neck structure, 5. First lock key, 6. Second lock key, 7. Stop guide drive key, 8. Limiting surface, 9. Opening, 10. Triangular block, 11. Dividing groove, 12. Shoulder, 13. Deformation groove, 14. Chamfer. DETAILED DESCRIPTION

[0051] 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.

[0052] Embodiment 1:

[0053] This embodiment provides an anti-loosening bottom expansion anchor bolt, comprising:

[0054] The screw 1 has a cylindrical rod with threads formed on its outer surface;

[0055] The sleeve 2 is in the shape of a hollow cylinder;

[0056] The expansion cone 3 is a cone, the small end of the expansion cone 3 is fixedly connected to one end of the screw 1 through a neck structure 4, the sleeve 2 is sleeved on the neck structure 4, and the neck structure 4 is a cylinder;

[0057] A first locking key 5, wherein the lower end of the sleeve 2 has a plurality of first locking keys 5 arranged at intervals, and the first locking keys 5 are in the shape of a sheet;

[0058] Second locking keys 6, a plurality of second locking keys 6 arranged at intervals are fixedly connected to the outer side of the expansion cone 3, the second locking keys 6 are also sheet-shaped, and the inner side surface of the second locking keys 6 forms an angle with the outer side surface of the expansion cone 3;

[0059] A stop guide driving key 7, wherein the lower end of the sleeve 2 has a plurality of stop guide driving keys 7 arranged at intervals, wherein the plurality of stop guide driving keys 7 correspond to the plurality of second locking keys 6, and are used to drive the plurality of second locking keys 6 to expand outward, and the stop guide driving key 7 is also in the shape of a sheet, and the length of the stop guide driving key 7 is shorter than the length of the first locking key 5;

[0060] The processing technology of the stop guide driving key 7 is prior art and will not be described in detail here.

[0061] When the expansion cone 3 is pulled between a plurality of first locking keys 5 , the expansion cone 3 drives the first locking keys 5 of the sleeve 2 to expand radially.

[0062] In this technical solution, when the anchor bolt needs to be installed, first use an impact drill (this is the existing technology, no more details are given here) to drill a hole on the base surface to be installed, ensuring that the hole diameter, hole depth and verticality meet the specification requirements, and then use a hard brush (this is the existing technology, no more details are given here) to clean the drilled hole, and then use an air pump (this is the existing technology, no more details are given here) to blow air into the hole to ensure that the dust in the hole is cleaned;

[0063] Next, install a bottom enlarging drill bit on the impact drill (this is the prior art and will not be described in detail here), and start the impact drill so that the impact drill drives the bottom enlarging drill bit to rotate, and put the bottom enlarging drill bit to the bottom of the hole in a rotating state, and then push it hard to open the reaming cutter head of the bottom enlarging drill bit to enlarge the hole. After completion, take the bottom enlarging drill bit out of the hole, and then use a hard brush and an air pump to clean the hole;

[0064] Then put the expansion cone 3 into the hole, so that the expansion cone 3 and the sleeve 2 reach the bottom of the hole. At this time, a section of the screw rod 1 will extend out of the base surface. At this time, put a gasket, a washer and a nut in the extended section of the screw rod 1 in sequence, and screw in the nut to push the gasket and the washer to move, so that the gasket contacts the base surface;

[0065] Then, a wrench is used to rotate the nut, thereby driving the screw rod 1 to move outward through the thread transmission, so that the screw rod 1 drives the expansion cone 3 to move outward through the neck area, thereby driving the expansion cone 3 to move toward the sleeve 2, so that the expansion cone 3 enters between the plurality of first lock keys 5, and the plurality of first lock keys 5 are radially deformed and expanded by the expansion cone 3, so that the first lock keys 5 are tightened in the hole;

[0066] At the same time, when the expansion cone 3 moves toward the sleeve 2, the stop guide driving key 7 on the sleeve 2 will also approach the second lock key 6 on the outer surface of the expansion cone 3. The second lock key 6 is in a sheet shape, one end of which is fixedly connected to the outer surface of the expansion cone 3, and the other end of which is spaced apart from the outer surface of the expansion cone 3. When the expansion cone 3 enters between the plurality of first lock keys 5, the plurality of stop guide driving keys 7 on the sleeve 2 will also respectively enter into the space between the plurality of second lock keys 6 and the outer surface of the expansion cone 3, thereby driving the second lock keys 6 to deform and expand, so that the first lock keys 5 and the second lock keys 6 are respectively pressed against the hole wall;

[0067] After the first lock key 5 and the second lock key 6 expand, unscrew the nut, take out the washer and the gasket, and then install the anchored component or equipment. Then, re-tighten the nut with a wrench and use a torque wrench to check the nut tightening torque value to ensure that the first lock key 5 and the second lock key 6 expand into place, and then complete the installation of the anchored component or equipment.

[0068] After the second lock key 6 expands, a barb-like structure is formed, which increases the overall friction of the anchor bolt, and allows the barb structure to form more friction between the anchor bolt and the base material, thereby enhancing the fixation. At the same time, it can effectively prevent the anchor bolt from loosening or being pulled out when subjected to tension or vibration, providing a stronger pull-out resistance. In addition, the barb structure helps to form a more stable anchoring point in the base surface, thereby improving the stability of the overall structure.

[0069] Embodiment 2:

[0070] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0071] Furthermore, a limiting structure is included to limit the rotation between the sleeve 2 and the neck structure 4, and the limiting structure includes:

[0072] The limiting surface 8 is a plane and is provided on the expansion cone 3 and the neck structure 4. The number of the limiting surfaces 8 corresponds to the number of the second locking keys 6. A plurality of the second locking keys 6 are respectively located on a plurality of limiting surfaces 8.

[0073] The inner ring of the sleeve 2 matches the outer contour of the neck structure 4, the inner side surface of the stop guide drive key 7 is a plane, and the inner side surface of the stop guide drive key 7 cooperates with the limiting surface 8 to achieve a guiding effect.

[0074] In the present technical solution, a plurality of limiting surfaces 8 are provided on the expansion cone 3 and the neck structure 4, and since the inner ring of the sleeve 2 matches the outer contour of the neck structure 4, the contact between the limiting surface 8, the outer contour of the neck structure 4 and the inner ring of the sleeve 2 can be used to guide the up and down movement of the sleeve 2, and prevent the sleeve 2 from rotating on the neck structure 4.

[0075] At the same time, since the expansion cone 3 is a cone and its outer surface is a conical surface, the position of the limiting surface 8 does not correspond to the first lock key 5, which facilitates the first lock key 5 to cooperate with the conical surface of the expansion cone 3;

[0076] Since the limiting surface 8 prevents the sleeve 2 from rotating on the neck structure 4, after the sleeve 2 is installed on the neck structure 4, the first lock key 5 of the sleeve 2 will correspond to the conical surface of the expansion cone 3, and the stop guide drive key 7 of the sleeve 2 will correspond to the limiting surface 8. A second lock key 6 is arranged on the limiting surface 8 to facilitate the stop guide drive key 7 of the sleeve 2 to correspond to the second lock key 6, so that the setting of the limiting surface 8 also plays a positioning role.

[0077] In this embodiment, the processing technology of the stop guide drive key 7 includes but is not limited to the following processes: while milling the limiting surface 8 on the expansion cone 3, a boss is left at the position of the stop guide drive key 7, and then the stop guide drive key 7 is formed by cutting.

[0078] Embodiment 3:

[0079] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0080] Furthermore, an opening 9 is provided between the second locking key 6 and the limiting surface 8, the opening 9 being formed by the angle between the inner side surface of the second locking key 6 and the outer side surface of the expansion cone 3, and the opening 9 is arranged toward the stop guide driving key 7;

[0081] When a plurality of the stop guide driving keys 7 are pulled into the openings 9 between a plurality of the second locking keys 6 and the limiting surface 8, the stop guide driving keys 7 drive the second locking keys 6 to expand radially.

[0082] In the present technical solution, by providing an opening 9 between the second lock key 6 and the limiting surface 8, after the sleeve 2 is mounted on the neck structure 4, the limiting surface 8 can be positioned so that the opening 9 between the second lock key 6 and the limiting surface 8 can correspond to the stop guide driving key 7, so that when the expansion cone 3 moves toward the first lock key 5, the stop guide driving key 7 of the sleeve 2 can also move toward the opening 9 between the second lock key 6 and the limiting surface 8 accordingly;

[0083] The gap of the opening 9 is smaller than the thickness of the stop guide drive key 7, so after the stop guide drive key 7 enters the opening 9, it will expand the opening 9. Since the stop guide drive key 7 expands the opening 9, the second lock key 6 will expand radially outward. While facilitating the radial expansion of the second lock key 6, the orientation of the opening 9 also facilitates the second lock key 6 to form a barb-like structure after expanding on the expansion cone 3, thereby enhancing the anchoring force.

[0084] Embodiment 4:

[0085] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0086] Furthermore, it also includes:

[0087] Triangular blocks 10, the outer surface of the first lock key 5 has a plurality of triangular blocks 10 spaced apart from each other in an upper and lower direction;

[0088] The protrusion of the triangular block 10 is arranged close to the sleeve 2 .

[0089] In the present technical solution, a number of triangular blocks 10 are arranged at intervals on the outer surface of the first lock key 5, and the protrusions of the triangular blocks 10 are arranged close to the sleeve 2, so that when the anchor bolt is installed in the hole, the shape of the triangular blocks 10 is not easy to affect the installation of the first lock key 5. However, after the sleeve 2 and the expansion cone 3 are completely installed in the hole, the protrusions of the triangular blocks 10 will cause a certain resistance to the upward movement of the sleeve 2, so that the sleeve 2 has a certain tensile strength in the hole, thereby achieving a pre-fixing effect. At the same time, it is also convenient to turn the screw 1 to drive the expansion cone 3 to move upward.

[0090] The triangular block 10 can also enhance the friction between the first lock key 5 and the hole wall to a certain extent. When anchoring is not performed, it can prevent the sleeve 2 from rotating relative to the hole wall. After anchoring, the first lock key 5 will press against the hole wall, and at the same time, the triangular block 10 will also press against the hole wall, so that the overall anchoring force is stronger, and the anti-loosening effect and anchoring effect are better.

[0091] Embodiment 5:

[0092] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0093] Furthermore, it also includes:

[0094] The dividing groove 11 is formed on the triangular block 10 and is used to divide the triangular block 10 into a plurality of parts.

[0095] In the present technical solution, a dividing groove 11 is provided to divide each triangular block 10 into several parts from left to right in sequence.

[0096] Through this structural design, more protrusion structures are added between the divided triangular block 10 and the hole wall, making the outer surface structure of the first lock key 5 more complex, and making the friction between the triangular block 10 and the hole wall greater, so that when anchoring is not performed, the effect of preventing relative rotation between the sleeve 2 and the hole wall is better, and after anchoring, the friction is also greater, and the anchoring and anti-loosening effects are better.

[0097] Embodiment 6:

[0098] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0099] Furthermore, it also includes:

[0100] The neck structure 4 has a stop shoulder 12, which is used to block the displacement of the sleeve 2;

[0101] The upper end of the sleeve 2 is disposed in contact with the lower end of the shoulder 12 .

[0102] In this technical solution, by providing a stop shoulder 12, when the sleeve 2 and the expansion cone 3 are placed into the hole, the neck structure 4 will drive the stop shoulder 12 to move toward the hole, and the stop shoulder 12 will push the sleeve 2 into the hole by contacting with the sleeve 2.

[0103] This structural design makes it convenient for the neck structure 4 to push the sleeve 2 into the hole through the shoulder 12, making installation faster and ensuring that the sleeve 2 can be correctly aligned with the bottom expansion hole drilled by the bottom expansion drill bit after being pushed in, preventing the sleeve 2 from shifting and avoiding uneven expansion.

[0104] Embodiment 7:

[0105] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0106] Furthermore, it also includes:

[0107] The deformation groove 13 is formed on the outer surface of the first locking key 5 , and the deformation groove 13 is located at the connection between the first locking key 5 and the sleeve 2 .

[0108] Through this structural design, when the first lock key 5 expands radially, the connection between the first lock key 5 and the sleeve 2 will bend and deform. The deformation groove 13 opened at the connection between the first lock key 5 and the sleeve 2 can reduce the extrusion and deformation of the material during the bending process, make the bending more uniform, and avoid cracks or warping at the connection between the first lock key 5 and the sleeve 2.

[0109] At the same time, the deformation groove 13 can reduce the internal stress of the material during bending, thereby reducing the risk of damage due to stress concentration.

[0110] Embodiment 8:

[0111] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0112] Furthermore, a chamfer 14 is formed on one side of the stop guide driving key 7 facing the opening 9 .

[0113] Through this structural design, by opening the chamfer 14, it is convenient for the stop guide drive key 7 to transition through the chamfer 14 and enter the opening 9, so that the stop guide drive key 7 can enter the opening 9 smoothly and is not prone to jamming or colliding with the second lock key 6.

[0114] Embodiment 9:

[0115] This embodiment provides an anti-loosening bottom-enlarged anchor bolt and an installation method of the anti-loosening bottom-enlarged anchor bolt, which is characterized by comprising the following steps:

[0116] S1. Drill holes on the installation base to ensure that the hole diameter, hole depth and verticality meet the specification requirements;

[0117] When the anchor bolt needs to be installed, first use an impact drill (this is the existing technology and will not be described in detail here) to drill holes on the base surface where it needs to be installed, ensuring that the hole diameter, hole depth and verticality meet the specification requirements;

[0118] S2. Clean the particles and dust in the hole;

[0119] Use a hard brush (this is the prior art, no further elaboration is made here) to clean the drilled hole, and then use an air pump (this is the prior art, no further elaboration is made here) to blow air into the hole to ensure that the dust in the hole is cleaned;

[0120] S3, expanding the bottom of the hole;

[0121] A bottom enlarging drill bit is installed on the impact drill (this is the prior art and will not be described in detail here), and the impact drill is started so that the impact drill drives the bottom enlarging drill bit to rotate, and the bottom enlarging drill bit is placed to the bottom of the hole in a rotating state, and then pushed hard to open the reaming cutter head of the bottom enlarging drill bit to enlarge the hole, and the bottom enlarging drill bit is taken out from the hole after completion;

[0122] S4. Clean the particles and dust in the hole after the bottom expansion;

[0123] Same as step 2, use a hard brush and an air pump to clean the dust particles in the hole.

[0124] S5, inserting the expansion cone 3 of the anti-loosening bottom expansion anchor bolt into the hole as an insertion section, so that the expansion cone 3 and the sleeve 2 reach the bottom of the hole;

[0125] Place the expansion cone 3 into the hole so that the expansion cone 3 and the sleeve 2 reach the bottom of the hole;

[0126] S6. Place a gasket, a washer and a nut on the screw rod 1 of the anti-loosening bottom expansion anchor bolt in sequence, screw in the nut to push the gasket and the washer to move, so that the gasket contacts the installation base surface;

[0127] After the expansion cone 3 and the sleeve 2 reach the bottom of the hole, a section of the screw 1 will extend out of the base surface. At this time, a gasket, a washer and a nut are sequentially placed in the extended section of the screw 1, and the nut is screwed in to push the gasket and the washer to move, so that the gasket contacts the base surface;

[0128] S7, tighten the nut with a wrench to drive the screw rod 1 of the anti-loosening bottom expansion anchor bolt to move upward, thereby driving the expansion cone 3 to move upward relative to the sleeve 2;

[0129] The nut is rotated with a wrench, thereby driving the screw rod 1 to move outward through thread transmission, so that the screw rod 1 drives the expansion cone 3 to move outward through the neck area, thereby driving the expansion cone 3 to move toward the sleeve 2;

[0130] S8, the expansion cone 3 of the anti-loosening bottom expansion anchor bolt moves upward relative to the sleeve 2, so that the first lock key 5 of the sleeve 2 cooperates with the expansion cone 3 and is expanded first;

[0131] After the expansion cone 3 moves toward the sleeve 2, the expansion cone 3 enters between the plurality of first lock keys 5, and the expansion cone 3 radially deforms and expands the plurality of first lock keys 5, thereby tightening the first lock keys 5 in the hole;

[0132] S9, when the first lock key 5 of the anti-loosening bottom expansion anchor bolt expands to a certain extent but not completely, the stop guide driving key 7 will expand the second lock key 6 due to the continued upward movement of the expansion cone 3 relative to the sleeve 2, forming a barb structure;

[0133] When the expansion cone 3 moves toward the sleeve 2, the stop guide driving key 7 on the sleeve 2 will also approach the second lock key 6 on the outer surface of the expansion cone 3. The second lock key 6 is in a sheet shape, one end of which is fixedly connected to the outer surface of the expansion cone 3, and the other end of which is spaced apart from the outer surface of the expansion cone 3. When the expansion cone 3 enters between the plurality of first lock keys 5, the plurality of stop guide driving keys 7 on the sleeve 2 will also respectively enter into the space between the plurality of second lock keys 6 and the outer surface of the expansion cone 3, thereby driving the second lock keys 6 to deform and expand, so that the first lock keys 5 and the second lock keys 6 are respectively pressed against the hole wall;

[0134] S10, after the first lock key 5 and the second lock key 6 of the anti-loosening bottom expansion anchor bolt are expanded, the anchoring is completed;

[0135] S11, unscrew the nut in the opposite direction, take out the washer and the gasket, and then install the screw rod 1 of the anti-loosening bottom anchor bolt into the anchored component.

[0136] After the first lock key 5 and the second lock key 6 expand, unscrew the nut, take out the washer and the gasket, and then install the anchored component or equipment. Then, re-tighten the nut with a wrench and use a torque wrench to check the nut tightening torque value to ensure that the first lock key 5 and the second lock key 6 expand into place, and then complete the installation of the anchored component or equipment.

[0137] Embodiment 10:

[0138] This embodiment provides an anti-loosening bottom-expanding anchor bolt, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features.

[0139] Furthermore, after the stopping guide driving key 7 of the anti-loosening bottom expansion anchor has expanded the second locking key 6 through cooperation, the lower end of the stopping guide driving key 7 of the anti-loosening bottom expansion anchor will interfere with the inside of the second locking key, thereby playing a stopping role and preventing the expansion cone 3 of the anti-loosening bottom expansion anchor from continuing to move upward relative to the sleeve 2.

[0140] Through this design, the stop guide driving key 7 has a stop effect, so that the worker can feel that the anchor bolt has been installed in place through resistance.

[0141] To sum up, the stop guide drive key 7 has the function of expanding the second lock key 6 so that the second lock key 6 can form a barb structure, and also has a guiding function. The inner side surface of the stop guide drive key 7 is a plane, which can cooperate with the limiting surface 8 to play a guiding role when the sleeve moves up and down. It also has a stopping function, which can play a stopping role by interfering with the second lock key 6 to prevent the expansion cone 3 of the anti-loosening expanded bottom anchor from continuing to move upward relative to the sleeve 2, so that the worker can sense that the anchor bolt has been installed in place through the interference.

[0142] 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. An anti-loosening bottom expansion anchor bolt, characterized in that: include: A screw (1) having a cylindrical rod with threads formed on its outer surface; A sleeve (2) in the shape of a hollow cylinder; The expansion cone (3) is a cone, the small end of the expansion cone (3) is fixedly connected to one end of the screw (1) via a neck structure (4), the sleeve (2) is sleeved on the neck structure (4), and the neck structure (4) is a cylinder; A first locking key (5), the lower end of the sleeve (2) is provided with a plurality of first locking keys (5) arranged at intervals, and the first locking keys (5) are in the shape of a sheet; Second locking keys (6), the outer side of the expansion cone (3) is fixedly connected with a plurality of second locking keys (6) arranged at intervals, the second locking keys (6) are also sheet-shaped, and the inner side surface of the second locking keys (6) forms an angle with the outer side surface of the expansion cone (3); A stop guide driving key (7), wherein the lower end of the sleeve (2) has a plurality of stop guide driving keys (7) arranged at intervals, wherein the plurality of stop guide driving keys (7) correspond to the plurality of second locking keys (6) and are used to drive the plurality of second locking keys (6) to expand outwards, wherein the stop guide driving key (7) is also in the form of a sheet, and the length of the stop guide driving key (7) is shorter than the length of the first locking key (5); When the expansion cone (3) is pulled between a plurality of first locking keys (5), the expansion cone (3) drives the first locking keys (5) of the sleeve (2) to expand radially.

2. The anti-loosening bottom expansion anchor bolt according to claim 1, characterized in that: It also includes a limiting structure for limiting the rotation between the sleeve (2) and the neck structure (4), and the limiting structure includes: A limiting surface (8) which is a plane and is provided on the expansion cone (3) and the neck structure (4). The number of the limiting surfaces (8) corresponds to the number of second locking keys (6), and a plurality of second locking keys (6) are respectively located on a plurality of limiting surfaces (8); The inner ring of the sleeve (2) matches the outer contour of the neck structure (4), the inner side surface of the stop guide drive key (7) is a plane, and the inner side surface of the stop guide drive key (7) cooperates with the limiting surface (8) to achieve a guiding effect.

3. The anti-loosening bottom-enlarged anchor bolt according to claim 2, characterized in that: An opening (9) is provided between the second locking key (6) and the limiting surface (8), the opening (9) being formed by an angle between an inner side surface of the second locking key (6) and an outer side surface of the expansion cone (3), and the opening (9) is arranged toward the stop guide driving key (7); When a plurality of the stop guide drive keys (7) are pulled into the openings (9) between a plurality of the second lock keys (6) and the limiting surface (8), the stop guide drive keys (7) drive the second lock keys (6) to expand radially.

4. The anti-loosening bottom expansion anchor bolt according to claim 3, characterized in that: Also includes: Triangular blocks (10), the outer surface of the first lock key (5) has a plurality of triangular blocks (10) arranged at intervals in the upper and lower parts; Wherein, the protrusion of the triangular block (10) is arranged close to the sleeve (2).

5. The anti-loosening bottom-enlarged anchor bolt according to claim 4, characterized in that: Also includes: A dividing groove (11) is provided on the triangular block (10) and is used to divide the triangular block (10) into a plurality of pieces.

6. The anti-loosening bottom-enlarged anchor bolt according to claim 5, characterized in that: Also includes: A stop shoulder (12), the neck structure (4) is provided with a stop shoulder (12), which is used to stop the displacement of the sleeve (2); The upper end of the sleeve (2) is arranged to abut against the lower end of the stop shoulder (12).

7. The anti-loosening bottom-enlarged anchor bolt according to claim 6, characterized in that: Also includes: A deformation groove (13) is provided on the outer surface of the first locking key (5), and the deformation groove (13) is located at the connection between the first locking key (5) and the sleeve (2).

8. The anti-loosening bottom expansion anchor bolt according to claim 7, characterized in that: The stop guide driving key (7) is provided with a chamfer (14) on one side facing the opening (9).

9. The method for installing an anti-loosening bottom-enlarged anchor bolt according to any one of claims 1 to 8, characterized in that: The following steps are included: S1. Drill holes on the installation base to ensure that the hole diameter, hole depth and verticality meet the specification requirements; S2. Clean the particles and dust in the hole; S3, expanding the bottom of the hole; S4. Clean the particles and dust in the hole after the bottom expansion; S5, inserting the expansion cone (3) of the anti-loosening bottom expansion anchor bolt as an insertion section into the hole, so that the expansion cone (3) and the sleeve (2) reach the bottom of the hole; S6. Place a gasket, a washer and a nut on the screw rod (1) of the anti-loosening bottom anchor bolt in sequence, screw in the nut to push the gasket and the washer to move, so that the gasket contacts the installation base surface; S7, tightening the nut with a wrench to drive the screw rod (1) of the anti-loosening bottom expansion anchor bolt to move upward, thereby driving the expansion cone (3) to move upward relative to the sleeve (2); S8, after the expansion cone (3) of the anti-loosening bottom expansion anchor bolt moves upward relative to the sleeve (2), the first locking key (5) of the sleeve (2) cooperates with the expansion cone (3) and is expanded first; S9, when the first locking key (5) of the anti-loosening bottom expansion anchor bolt expands to a certain extent but not completely, the stop guide driving key (7) will expand the second locking key (6) due to the continued upward movement of the expansion cone (3) relative to the sleeve (2), thereby forming a barbed structure; S10, after the first locking key (5) and the second locking key (6) of the anti-loosening bottom expansion anchor bolt are expanded, the anchoring is completed; S11, unscrew the nut in the opposite direction, take out the washer and the gasket, and then install the screw rod (1) of the anti-loosening bottom anchor bolt into the anchored component.

10. The installation method of the anti-loosening bottom expansion anchor bolt according to claim 9, characterized in that: After the stop guide driving key (7) of the anti-loosening bottom expansion anchor bolt has expanded the second lock key (6) through cooperation, the lower end of the stop guide driving key (7) of the anti-loosening bottom expansion anchor bolt will come into contact with the inside of the second lock key, playing a stopping role, thereby preventing the expansion cone (3) of the anti-loosening bottom expansion anchor bolt from continuing to move upward relative to the sleeve (2).

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