A type of stable expansion bolt

Abstract

This invention relates to a stable expansion bolt, comprising: a first stud and a second stud, one end of the first stud being connected to the second stud via a contracting transition section; a first expansion assembly, comprising: a first thread formed on the first stud, a first threaded sleeve threaded onto the first stud, a first tapered head disposed at the end of the first threaded sleeve, and a first sleeve assembly disposed on the first threaded sleeve; a second expansion assembly; reinforcing sleeve assemblies respectively disposed on the two sets of sleeve assemblies; a screw head connected to the end of the second stud for rotation; and a sealing mechanism for sealing the mounting hole. With the above configuration, the lateral structural strength is improved, and the stud will not bulge out after installation and tightening, thus preventing obstruction or scratching of the placed load.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of expansion bolts, in particular to a stable expansion bolt. BACKGROUND

[0002] At present, the expansion bolts sold in the market mainly consist of a stud base rod, an expansion tube, a gasket and a nut. The end of the base rod is conical, and the small end of the base rod is provided with threads. A large section of one end of the expansion tube is provided with three longitudinal openings, so that the one end of the expansion tube is divided into three pieces. During assembly, the expansion tube is first sleeved on the base rod, and the opening end thereof is close to the large end of the base rod. The small end of the base rod protrudes outside the end of the expansion tube without the opening, the gasket is sleeved on the small end, and the nut is positioned, so that the base rod, the expansion tube, the gasket and the nut form an integral body. During use, a hole is first punched in the wall, and the diameter of the hole is approximately equal to the diameter of the expansion bolt. Then, the end of the expansion bolt close to the large end of the base rod is inserted into the hole in the wall, and the small end of the base rod is knocked with a hammer, so that the gasket is close to the wall surface. Then, the nut is tightened with a wrench. With the tightening of the nut, the base rod moves outward, and the expansion tube remains in place due to the action of the gasket. In this way, with the outward movement of the base rod, the large end (inner end) of the base rod gradually enters the opening end of the expansion tube and expands the expansion tube, so that the expansion bolt is tightly fixed in the hole in the wall.

[0003] Since the bolt expands the expansion tube through the conical end, the tensile strength can be greatly increased, but when subjected to shear force, the conical end portion is subjected to a large force, especially when the load state is switched between the loaded state and the unloaded state for a long time, the installation hole is easily pricked into a conical hole, thereby causing the problem that the expansion bolt is easily shaken or even falls off after long-term use in the above state, and the stud protrudes outward after installation and moves outward with the tightening, which easily causes obstruction or scratches to the placed load. SUMMARY

[0004] To solve the above technical problems, the present application provides a stable expansion bolt.

[0005] To achieve the above purpose, the technical scheme of the present application is as follows:

[0006] A stable expansion bolt, comprising:

[0007] a first stud and a second stud, one end of the first stud being connected to the second stud through a contracted transition section;

[0008] a first expansion assembly, comprising: a first thread provided in the first stud, a first thread sleeve sleeved on the first thread, a first conical head provided at the end of the first thread sleeve, and a first sleeve assembly sleeved on the first thread sleeve;

[0009] The second expansion assembly comprises a second thread formed in the second stud, a second thread sleeve sleeved on the second stud, a second conical head arranged on the second thread sleeve, and a second sleeve assembly sleeved on the second thread sleeve and capable of abutting against the first sleeve assembly.

[0010] The anti-rotation assembly is used for preventing the two sets of thread sleeves from rotating.

[0011] The reinforcing sleeve assembly is respectively sleeved on the two sets of sleeve assemblies.

[0012] The screw head is connected to the end of the second stud for rotation.

[0013] The sealing mechanism is used for sealing the mounting hole.

[0014] According to the technical scheme, the expansion bolt is knocked into the mounting hole parallel to the ground, and the screw head is rotated to drive the first stud and the second stud to rotate. When the first stud rotates, the first thread sleeve is in threaded transmission, so that the first conical head extrudes the first sleeve assembly to expand, thereby forming abutting against the first stud and the mounting hole, and forming a force point of a distal end. When the second stud rotates, the second thread sleeve is in threaded transmission, so that the second conical head extrudes the second sleeve assembly to expand, thereby forming abutting against the second stud and the mounting hole, and forming a force point of a proximal end. The two force points of the distal end and the proximal end cooperate to increase the shear-resistant force arm of the bolt, thereby increasing the structural strength of the shear-resistant lateral force, the reinforcing sleeve assembly can further increase the support force of the middle end and the proximal end, the anti-rotation assembly can prevent the thread sleeve from rotating with the stud, the sealing mechanism can increase the sealing degree, prevent water from entering the mounting hole to cause rust of the bolt and even the steel bars in the concrete after long-term use, and avoid the problem that only the distal end force point is sufficient in tensile strength, but when subjected to shear force, especially when the state is switched between load and no load for a long time, the mounting hole is easily pried into a conical hole, thereby being easily detached after long-term use in the above state, and the stud does not protrude after installation and does not cause obstruction or scratches to the placed load.

[0015] As a preferred scheme of the present application, the first sleeve assembly comprises a first side sleeve sleeved on the first stud and abutting against the first conical head at one end, a first narrowed section arranged at the other end of the first side sleeve, and a second side sleeve connected to the first narrowed section, wherein the second side sleeve extends to the junction of the first stud and the transition section.

[0016] According to the technical scheme, the first conical head can extrude the first side sleeve to expand.

[0017] As a preferred scheme of the present application, the second sleeve assembly comprises: a first mouth sleeve sleeved on the second edge sleeve, a second narrowing section connected to the first mouth sleeve and matched to the second tapered head, and a second mouth sleeve sleeved on the second threaded sleeve and connected to the second narrowing section.

[0018] The second tapered head can extrude the second narrowing section to expand, and the outer circumferential sides of the second reinforcing sleeve, the first mouth sleeve, the first edge sleeve, and the first tapered head are located in the same cylindrical surface, which is the inner wall of the mounting hole, thereby increasing the fitting degree and structural strength.

[0019] As a preferred scheme of the present application, the anti-rotation assembly comprises: limiting grooves in strip shapes and respectively provided in the first edge sleeve and the second mouth sleeve along the length, and limiting blocks respectively connected to the first threaded sleeve and the second threaded sleeve and slidingly connected to the corresponding limiting grooves.

[0020] The corresponding sliding blocks slide up and down in the sliding grooves and can block the rotation of the threaded sleeves when the first threaded sleeve and the second threaded sleeve slide up and down.

[0021] As a preferred scheme of the present application, the reinforcing sleeve assembly comprises: a first reinforcing sleeve and a second reinforcing sleeve respectively sleeved on the second edge sleeve and the second mouth sleeve, and fitting surfaces respectively provided in the first reinforcing sleeve and the second reinforcing sleeve and matched to the first narrowing section and the second narrowing section.

[0022] The reinforcing sleeve can increase the structural strength of the first narrowing section and the second narrowing section when the bolt is subjected to lateral force.

[0023] As a preferred scheme of the present application, the sealing mechanism comprises: a bearing sheet rotatably sleeved on the second stud, a sliding sealing ring sealingly movably sleeved between the second stud and the bearing sheet, a groove provided on the side of the bearing sheet close to the stud, and helical teeth annularly provided on the outer side of the groove of the bearing sheet, the second mouth sleeve protrudes from the second reinforcing sleeve to form a height difference, the groove is annularly provided with a convex ring matched to the reinforcing sleeve, and the groove between the convex ring and the helical teeth is provided with a sealing gasket.

[0024] When the screw head is tightened, the sliding sealing ring forms a seal with the stud and the bearing sheet, the sealing gasket abuts against the wall surface to reduce the water flow invasion, the helical teeth can be engaged with the wall surface when being tightened to prevent the bearing sheet from rotating relative to the wall surface, thereby guaranteeing the effect of the sealing gasket, the convex ring, the second reinforcing sleeve, and the second mouth sleeve form a stepped seal to prevent water flow from entering the mounting hole.

[0025] As a preferred scheme of the present application, the screw head is provided with an inner hexagonal socket, and the screw head and the bearing sheet have a spacing for arranging a connecting piece.

[0026] The inner hexagon is arranged to facilitate the installation of the bolt through a hexagonal wrench.

[0027] As a preferred scheme of the present application, the first reinforcing sleeve, the second reinforcing sleeve, the first edge sleeve and the first mouth sleeve are all provided with anti-skid lines.

[0028] The above technical solution is implemented to increase the adhesion of the hole wall and prevent the sleeve assembly from rotating with the installation hole when being tightened.

[0029] As a preferred scheme of the present application, the first edge sleeve is provided with a first broken slot along the length of the end, and the second threaded taper head is provided with a second broken slot on one side close to the transition section.

[0030] The above technical solution is implemented to form a fissure guide to facilitate the expansion of the first edge sleeve and the second threaded sleeve.

[0031] As a preferred scheme of the present application, the first threaded sleeve is provided with a sliding slot, and the first edge sleeve is provided with a sliding block matched with the sliding slot.

[0032] The above technical solution is implemented to provide support for the up-and-down movement of the first threaded sleeve.

[0033] In summary, the present application has the following advantages:

[0034] The present application provides a stable expansion bolt. First, the expansion bolt is knocked into an installation hole parallel to the ground, and the screw head is rotated to drive the first screw post and the second screw post to rotate. When the first screw post rotates, it forms a threaded transmission with the first threaded sleeve, so that the first taper head extrudes the first sleeve assembly to expand, thereby forming a tight fit between the first screw post and the installation hole, constituting a force point at the distal end. When the second screw post rotates, it forms a threaded transmission with the second threaded sleeve, so that the second taper head extrudes the second sleeve assembly to expand, thereby forming a tight fit between the second screw post and the installation hole, constituting a force point at the proximal end. The two force points at the distal end and the proximal end cooperate to increase the shear-resistant arm of the bolt, thereby increasing the structural strength of the shear-resistant lateral force. The reinforcing sleeve assembly can further increase the support force of the distal end and the proximal end. The anti-rotation assembly can prevent the threaded sleeve from rotating with the screw post. The sealing mechanism can increase the sealing degree to prevent water from entering the installation hole and causing rust of the steel bars in the concrete after long-term use. The present application avoids the problem that only the distal end force point has sufficient tensile strength, but when subjected to shear force, especially when switching between load and no load for a long time, the installation hole is easily pried into a conical hole, thereby easily falling off after long-term use in the above state. After installation, the screw post will not protrude with tightening, and will not cause obstruction or scratches to the placed load. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0036] Figure 1 Structure diagram of the present application.

[0037] Figure 2 Structure diagram of the present application Figure 1 Enlarged view of A in the present application.

[0038] Figure 3 Structure diagram of the present application Figure 1 Enlarged view of B in the present application.

[0039] Figure 4 Structure diagram of the present application when installed.

[0040] Figure 5 Structure diagram of the present application when installed.

[0041] Corresponding component names represented by numbers and letters in the drawings:

[0042] 1, first stud; 2, transition section; 3, second stud; 4, screw head; 5, first threaded sleeve; 6, sliding groove; 7, sliding block; 8, first edge sleeve; 9, first narrowing section; 10, second edge sleeve; 11, first port sleeve; 12, second narrowing section; 13, limiting groove; 14, limiting block; 15, first break slot; 16, first tapered head; 17, second threaded sleeve; 18, second break slot; 19, second thread; 20, second reinforcing sleeve; 21, mating surface; 23, bearing sheet; 24, inner hexagon; 26, second port sleeve; 27, non-slip pattern; 28, first reinforcing sleeve; 29, connecting piece; 30, mounting hole; 31, helical tooth; 32, groove; 33, protruding ring; 34, sliding sealing ring; 35, sealing gasket; 36, first thread; 37, second tapered head. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] EMBODIMENT

[0045] As Figures 1-5As shown, a stable expansion bolt comprises:

[0046] a first stud 1 and a second stud 3, one end of the first stud 1 is connected to the second stud 3 through a contracted transition section 2;

[0047] a first expansion assembly, comprising: a first thread 36 opened on the first stud 1, a first thread sleeve 5 threadedly sleeved on the first stud 1, a first tapered head 16 arranged at an end of the first thread sleeve 5, and a first sleeve assembly sleeved on the first thread sleeve 5;

[0048] a second expansion assembly, comprising: a second thread 19 opened on the second stud 3, a second thread sleeve 17 threadedly sleeved on the second stud 3, a second tapered head 37 arranged on the second thread sleeve 17, and a second sleeve assembly sleeved on the second thread sleeve 17 and capable of abutting against the first sleeve assembly;

[0049] a rotation prevention assembly for preventing the rotation of the two sets of thread sleeves;

[0050] a reinforcing sleeve assembly respectively sleeved on the two sets of sleeve assemblies;

[0051] a screw head 4 connected to an end of the second stud 3 for rotation;

[0052] a sealing mechanism for sealing the mounting hole 30.

[0053] The first sleeve assembly comprises: a first edge sleeve 8 sleeved on the first stud 1 and abutting against the first tapered head 16 at one end, a first narrowed section 9 arranged at the other end of the first edge sleeve 8, and a second edge sleeve 10 connected to the first narrowed section 9, the second edge sleeve 10 extending to the junction of the first stud 1 and the transition section 2, and the first tapered head 16 being capable of extruding the first edge sleeve 8 to expand.

[0054] The second sleeve assembly comprises: a first mouth sleeve 11 sleeved on the second edge sleeve 10, a second narrowed section 12 connected to the first mouth sleeve 11 and adapted to the second tapered head 37, and a second mouth sleeve 26 connected to the second narrowed section 12 and sleeved on the second thread sleeve 17, the second tapered head 37 being capable of extruding the second narrowed section 12 to expand, and the outer circumferential sides of the second reinforcing sleeve 20, the first mouth sleeve 11, the first edge sleeve 8, and the first tapered head 16 all being located in the same cylindrical curved surface, which is the inner wall of the mounting hole 30, thereby increasing the adhesion and structural strength.

[0055] The rotation prevention assembly comprises: limiting grooves 13 in strip shape respectively opened on the first edge sleeve 8 and the second mouth sleeve 26 along the length, and limiting blocks 14 respectively connected to the first thread sleeve 5 and the second thread sleeve 17 and slidingly connected to the corresponding limiting grooves 13, the corresponding sliding blocks 7 sliding up and down in the sliding grooves 6 when the first thread sleeve 5 and the second thread sleeve 17 slide up and down, and capable of blocking the rotation of the thread sleeves.

[0056] The reinforcing sleeve assembly comprises a first reinforcing sleeve 28 and a second reinforcing sleeve 20 sleeved on the second edge sleeve 10 and the second mouth sleeve 26 respectively, and a fitting surface 21 opened on the first reinforcing sleeve 28 and the second reinforcing sleeve 20 and adapted to the first narrowed section 9 and the second narrowed section 12 respectively. By arranging the reinforcing sleeve, the structural strength of the first narrowed section 9 and the second narrowed section 12 under lateral force can be increased.

[0057] The sealing mechanism comprises a bearing sheet 23 rotatably sleeved on the second stud 3, a sliding sealing ring 34 sealingly movably sleeved between the second stud 3 and the bearing sheet 23, a groove 32 opened on the bearing sheet 23 close to the stud, and a helical tooth 31 annularly arranged outside the groove 32 of the bearing sheet 23. The second mouth sleeve 26 protrudes from the second reinforcing sleeve 20 to form a height difference. The groove 32 annularly arranged with a convex ring 33 adapted to the reinforcing sleeve. The sealing gasket 35 is arranged between the convex ring 33 and the helical tooth 31. When the screw head 4 is tightened, the sliding sealing ring 34 forms a seal with the stud and the bearing sheet 23. The sealing gasket 35 abuts against the wall surface to reduce the water flow invasion. The helical tooth 31 can be engaged with the wall surface when being tightened to prevent the bearing sheet 23 from rotating relative to the wall surface, thereby ensuring the effect of the sealing gasket 35. The convex ring 33, the second reinforcing sleeve 20 and the second mouth sleeve 26 form a stepped seal to prevent water flow from entering the mounting hole 30.

[0058] The screw head 4 is provided with an inner hexagon 24. The screw head 4 and the bearing sheet 23 have a spacing for arranging a connecting piece 29. The inner hexagon 24 is arranged to facilitate the installation of the bolt by a hexagonal wrench.

[0059] The outer periphery of the first reinforcing sleeve 28, the second reinforcing sleeve 20, the first edge sleeve 8 and the first mouth sleeve 11 is provided with anti-skid lines 27 to increase the adhesion with the inner wall of the mounting hole 30 and prevent the sleeve assembly from rotating with the mounting hole 30 when being tightened.

[0060] The first edge sleeve 8 is provided with a first broken slot 15 along the length of the end portion. The second threaded sleeve 17 is provided with a second broken slot 18 opened on the side close to the transition section 2 of the conical head of the second thread 19 to form a crack guide, thereby facilitating the expansion of the first edge sleeve 8 and the second threaded sleeve 17.

[0061] The first threaded sleeve 5 is provided with a sliding groove 6, and the first edge sleeve 8 is provided with a sliding block 7 adapted to the sliding groove 6. The sliding block 7 can provide support when facilitating the up-and-down movement of the first threaded sleeve 5.

[0062] In use, first knock the expansion bolt into the installation hole 30 parallel to the ground, and turn the screw head 4, so as to drive the first stud 1 and the second stud 3 to rotate, the first stud 1 rotates and forms threaded transmission with the first threaded sleeve 5, so that the first tapered head 16 extrudes the first sleeve assembly to expand, thereby forming the first stud 1 and the installation hole 30 to be tightly closed, constituting the force point of the distal end point, the second stud 3 rotates and forms threaded transmission with the second threaded sleeve 17, so that the second tapered head 37 extrudes the second sleeve assembly to expand, thereby forming the second stud 3 and the installation hole 30 to be tightly closed, constituting the force point of the proximal end point, the distal end and the proximal end two force points cooperate, increase the shear force arm of the bolt, thereby increasing the structural strength of the shear lateral force, the sleeve assembly can further increase the support force of the middle end and the proximal end, the anti-rotation assembly can prevent the threaded sleeve from rotating with the stud, the sealing mechanism can increase the sealing degree, prevent water from entering the installation hole 30 after long-term use to cause the bolt and even the steel bars in the concrete to rust, avoid the problem that only the distal end force point, although the tensile strength is sufficient, but when subjected to shear force, especially when the load state and the non-load state are switched for a long time, the installation hole 30 is easy to be pricked into a tapered hole, thereby being easy to fall off after long-term use in the above state, and the stud will not protrude after installation with tightening, will not cause obstruction or scratch to the placed load, when slightly loose, the stud can be further tightened, and the stud will not protrude.

[0063] The above description of disclosed embodiments enables one skilled in the art to make or use the application. Numerous modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A stable expansion bolt, characterized by, The utility model relates to a kind of anti-rotation screw joint, including: First stud and second stud, one end of the first stud is connected to the second stud by the transition section of contraction; First expansion assembly, including: first thread opened in the first stud, first thread sleeve threadedly fitted in the first stud, first tapered head arranged at the end of the first thread sleeve, first sleeve assembly fitted in the first thread sleeve; Second expansion assembly, including: second thread opened in the second stud, second thread sleeve threadedly fitted in the second stud, second tapered head arranged at the second thread sleeve, second sleeve assembly fitted in the second thread sleeve and capable of abutting first sleeve assembly; Anti-rotation assembly for preventing two sets of thread sleeves from rotating; Respectively fitted in two sets of sleeve assembly Reinforced sleeve assembly; Screw head connected to the end of the second stud for rotation; Sealing mechanism for sealing the mounting hole; The first sleeve assembly includes: first side sleeve fitted in the first stud and abutting the first tapered head at one end, first narrow section arranged at the other end of the first side sleeve, and second side sleeve connected to the first narrow section, which extends to the junction of the first stud and the transition section; The second sleeve assembly includes: first mouth sleeve fitted in the second side sleeve, second narrow section connected to the first mouth sleeve and adapted to the second tapered head, second mouth sleeve connected to the second narrow section and fitted in the second thread sleeve; The reinforced sleeve assembly includes: first reinforced sleeve and second reinforced sleeve respectively fitted in the second side sleeve and the second mouth sleeve, and abutting surface opened in the first reinforced sleeve and the second reinforced sleeve and respectively adapted to the first narrow section and the second narrow section; The sealing mechanism includes: carrier sheet rotatably fitted in the second stud, sliding seal ring sealingly movably fitted between the second stud and the carrier sheet, recess opened in the carrier sheet near the stud side, and helical teeth annularly arranged outside the recess opening of the carrier sheet, the second mouth sleeve protrudes from the second reinforced sleeve to form a height difference, the recess between the convex ring adapted to the reinforced sleeve and the helical teeth is provided with a sealing pad.

2. The stabilizing expansion bolt of claim 1, wherein, The anti-rotation assembly includes: limiting grooves opened in the first side sleeve and the second mouth sleeve along the length and in strip shape, and limiting blocks connected to the first thread sleeve and the second thread sleeve and slidingly connected to the corresponding limiting grooves.

3. The stabilizing expansion bolt of claim 1, wherein, The screw head is provided with an inner hexagonal socket, and the screw head and the carrier sheet have a spacing for arranging a connecting piece.

4. The stabilizing expansion bolt of claim 1, wherein, The outer periphery of the first reinforced sleeve, the second reinforced sleeve, the first side sleeve and the first mouth sleeve is provided with anti-slip lines.

5. The stabilizing expansion bolt of claim 2, wherein, The end of the first side sleeve is provided with a first broken slot along the length, and the side of the second thread tapered head near the transition section is provided with a second broken slot.

6. A stabilising expansion bolt according to claim 5 wherein, The first thread sleeve is provided with a sliding groove, and the first side sleeve is provided with a sliding block adapted to the sliding groove.

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