Torque tensile expansion bolt

Abstract

The invention relates to the technical field of fasteners, in particular to a torque tensile expansion bolt which comprises a stud, a sleeve, a flat washer, a spring washer and a nut, the stud is coaxially sleeved with the sleeve, one end of the stud extends out of the sleeve, and the flat washer, the spring washer and the nut are coaxially connected to the end, extending out of the sleeve, of the stud; according to the torque stretching expansion bolt, the stud with the wedge-shaped section and the sleeve with the wedge-shaped surface and the limiting section are arranged, and the expansion groove of the sleeve penetrates through the end close to the nut, so that even if the expansion section is subjected to plastic deformation, the torque stretching expansion bolt can still be recycled under the condition that the internal diameter of the connecting hole is not damaged; and when the recycled torque stretching expansion bolt is continuously adopted, the hole diameter of the connecting hole does not need to be increased, so that recycling and reusing of the torque stretching expansion bolt are guaranteed, and the waste rate of the expansion bolt is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fasteners, in particular to a torque tension expansion bolt. Background Art

[0002] Torque expansion bolts are widely used as fasteners in the fields of construction and engineering, and are mainly used to connect and fix two or more structural members. The working principle of torque expansion bolts is based on the axial movement of the stud in the casing through the action of torque. An expansion groove is provided on the side wall of the casing, and the wedge-shaped head on the stud squeezes the inner wall of the casing. The casing increases in diameter after the squeezing force of the stud, thereby achieving an anchoring effect. However, after the existing expansion bolts are dismantled, due to the structural characteristics of conventional torque expansion bolts, the casing of the torque expansion bolt after anchoring undergoes plastic deformation, which is difficult to recycle, resulting in the torque expansion bolts having to be disposed of, and the torque expansion bolts are not easy to be removed from the connecting hole. When the expansion bolts in the connecting hole need to be replaced, the connecting hole needs to be destroyed, and then another type of torque expansion bolt needs to be replaced for anchoring, or fillers are added to the original connecting hole before the torque expansion bolts are anchored, which can easily reduce the anchoring effect.

[0003] In response to the above problems, the prior art provides some solutions. For example, the invention patent with patent application number CN202210559989.4 provides a detachable expansion bolt. The solution provided by the invention is that two clips are arranged in the through groove of the middle column section, and the expansion sleeve is provided with a plurality of spring tongues elastically extending to the inside of the rear end of the expansion sleeve. An annular groove that can cooperate with the spring tongue to stop retreat is provided on the middle column section located outside the through groove. The screw sleeve is screwed on the middle column section and the top column section, and the outermost end of the top column end extends to the outside of the screw sleeve, an inner nut is screwed on the threaded section, and an outer locking sleeve is screwed on the outer end of the screw sleeve. Through this structure, the expansion bolt can be easily removed and the expansion sleeve can be reused. However, in this structure, the clamp and the middle column section are connected by pins. In actual applications, small-diameter pins are prone to bending or breaking during anchoring due to the lack of torque limitation, and cannot meet the anchoring requirements. Large-diameter pins reduce the torsional strength of the middle column section, and the middle column section is prone to breaking after the torque is applied, and still cannot meet the anchoring requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a torque-tension expansion bolt to solve the problem that due to the structural characteristics of conventional torque-tension expansion bolts, the sleeve of the torque-tension expansion bolt after anchoring undergoes plastic deformation and is difficult to recycle, while also solving the problem that the torque-tension expansion bolts in existing solutions have no torque limitation.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A torque tension expansion bolt, comprising a stud, a sleeve, a flat washer, a spring washer and a nut, wherein the stud is coaxially sleeved in the sleeve and one end extends outside the sleeve, the flat washer, the spring washer and the nut are all coaxially connected to the end of the stud extending outside the sleeve, the sleeve comprises an expansion section and a limit section, the limit section is located at the end of the sleeve away from the nut, the inner wall of the expansion section is a frustum-shaped wedge surface, a plurality of expansion grooves are arranged in an annular array on the side wall of the expansion section, the length directions of the plurality of expansion grooves are parallel to the axial direction of the sleeve, and completely penetrate the expansion section away from the limit section. The end of the position segment, the stud includes a threaded segment and a wedge segment, the wedge segment is slidably connected to the wedge surface, and the taper of the wedge segment is the same as the taper of the wedge surface, the threaded segment extends outside the casing, and one end of the threaded segment is located inside the casing, a plurality of limiting teeth are arranged in an annular array on the end of the limiting segment away from the expansion segment, and the plurality of limiting teeth extend into the casing, a limiting component is arranged on the end of the wedge segment away from the threaded segment, and the limiting component is designed so that after the stud extends out of the casing to a set length, the limiting component abuts against the limiting teeth and restricts the stud from continuing to move outside the casing.

[0007] Through the sliding connection of the wedge-shaped portion and the wedge-shaped surface, and the sliding connection of the flat washer and the sleeve, when the nut is rotated to make the stud move axially out of the sleeve, the wedge-shaped section squeezes the expansion section and expands the expansion section, the width of the multiple expansion grooves gradually increases, and the outer diameter of the expansion section increases, thereby completing the anchoring between the torque-stretching expansion bolt and the connecting hole; and because the wedge-shaped section and the wedge-shaped surface are wedge-shaped, the entire outer side wall of the expansion section is radially deformed, and the outer side wall of the expanded expansion section is fitted with the inner wall of the connecting hole, thereby ensuring the contact area between the expansion section and the connecting hole, thereby ensuring the friction between the expansion section and the connecting hole, and then ensuring the anchoring effect between the torque-stretching expansion bolt and the connecting hole.

[0008] Furthermore, since the limiting section and the wedge section are in a non-matching state, the outer diameter of the limiting section does not change. When the torque-stretching expansion bolt is recovered, the nut is rotated to make the stud move axially into the casing, and the expansion section gradually loses the squeezing effect of the wedge section. Under the elastic deformation of the casing material itself, the outer diameter of the expansion section gradually decreases, and the width of the expansion groove gradually returns to the initial width. When the outer diameter of the expansion section is reduced to be smaller than the inner diameter of the connecting hole, the torque-stretching expansion bolt can be pulled out of the connecting hole, thereby completing the recovery of the torque-stretching expansion bolt; since the expansion groove completely passes through the end of the expansion section away from the limiting section, even if the expansion section undergoes plastic deformation, after removing the nut, spring washer and flat washer, use pliers or clamps to clamp the end of the expansion section close to the nut, and tighten the casing A pulling force is applied to extract the connecting hole. Since the outer diameter of the expansion section is a circumferential surface, when the sleeve is pulled out from the connecting hole, there are infinite positions between the expansion section and the connecting hole, and the torque-stretching expansion bolt can still be pulled out of the connecting hole, thereby completing the recovery of the torque-stretching expansion bolt. At the same time, even if the expansion section undergoes plastic deformation, since the outer diameter of the expansion section is a circumferential surface, the outer diameter of the limiting section does not change. When the recovered torque-stretching expansion bolt continues to be used, there is no need to increase the aperture of the connecting hole. The torque-stretching expansion bolt only needs to be pushed into the connecting hole, and then the nut is rotated until the outer wall of the expansion section fits with the inner wall of the connecting hole, thereby completing the anchoring between the torque-stretching expansion bolt and the connecting hole. This ensures the recovery and reuse of the torque-stretching expansion bolt and reduces the waste rate of the expansion bolt.

[0009] Furthermore, when installing the torque-tensioning expansion bolt, if the torque continues to be applied after the expansion section is fitted into the connecting hole, it is easy to cause excessive torque applied to the stud, thereby causing the threaded structure on the stud or nut to fail, or causing the stud to break. At the same time, it is easy to over-exert the inner wall of the connecting hole, causing the inner wall of the connecting hole to crack or the hole diameter to be damaged, resulting in reduced anchoring effect between the torque-tensioning bolt and the connecting hole or anchoring failure. For this reason, by providing a limiting tooth on the limiting section of the sleeve and a limiting component on the stud, when locking the torque-tensioning expansion bolt, the stud The stud makes axial movement outside the sleeve, and the length of the stud extending outside the sleeve gradually increases. After the outer wall of the expansion section fits with the inner wall of the connecting hole, the nut continues to be rotated, and the pressure between the expansion section and the connecting hole gradually increases until the limit assembly fits with the limit tooth. The limit assembly restricts the stud from continuing to move outside the sleeve, thereby avoiding excessive pressure between the expansion section and the connecting hole and damaging the connecting hole, thereby ensuring the friction between the expansion section and the connecting hole, and at the same time ensuring the structural safety of the stud and the bolt, thereby ensuring the anchoring effect between the torque-stretching expansion bolt and the connecting hole.

[0010] Preferably, the limiting assembly includes a limiting plate and an adjusting bolt, a stepped hole is coaxially opened in the stud, the stepped hole completely penetrates the stud, the stepped hole includes a first light hole and a second light hole, the inner diameter of the first light hole is larger than the inner diameter of the second light hole, and the second light hole is located in the wedge-shaped section, the adjusting bolt is coaxially arranged in the stepped hole, and one end extends outside the sleeve, the limiting plate is threadedly connected to one end of the adjusting bolt extending outside the sleeve, the diameter of the sleeve is D1, and the maximum diameter of the limiting plate is D2, wherein 1mm≤D2-D1≤4mm.

[0011] By setting the limit plate and the adjusting bolt, the nut is rotated to make the stud move axially out of the sleeve, the wedge-shaped section squeezes the expansion section and expands the expansion section, the width of the multiple expansion grooves gradually increases, and the outer diameter of the expansion section increases, thereby completing the anchoring between the torque-stretching expansion bolt and the connecting hole, and continuing to rotate the nut until the limit bolt abuts against the bottom of a light hole. The limit bolt limits the stud from continuing to move axially out of the sleeve, thereby completing the limitation of the stud, thereby avoiding excessive pressure between the expansion section and the connecting hole and damaging the connecting hole, thereby ensuring the friction between the expansion section and the connecting hole, while ensuring the structural safety of the stud and the bolt, and then ensuring the anchoring effect between the torque-stretching expansion bolt and the connecting hole.

[0012] Furthermore, by arranging the limit plate and the adjusting bolt as a bolt connection, when the torque-tension expansion bolt is anchored to substrates of different materials, the limit position of the stud can be adjusted by adjusting the depth of the bolt screwed into the limit plate, thereby avoiding the problem of excessive torque applied to the stud causing structural failure of the stud or nut, or cracking of the inner wall of the connecting hole or damage to the aperture, thereby ensuring the anchoring effect between the torque-tension expansion bolt and the connecting hole.

[0013] Preferably, the limiting assembly includes a limiting plate and an adjusting bolt, a threaded hole is coaxially opened on one end of the wedge-shaped segment away from the threaded segment, the adjusting bolt is threadedly connected to the threaded hole, and one end extends outside the sleeve, the limiting plate is connected to the end of the adjusting bolt extending outside the sleeve, the diameter of the sleeve is D1, and the maximum diameter of the limiting plate is D2, wherein 1mm≤D2-D1≤4mm.

[0014] For studs with an aspect ratio greater than 5, since the torque-tension expansion bolts using studs with an aspect ratio greater than 5 have higher requirements for anchoring force and torque, if a stepped hole is set in the stud, the shear strength and torsional strength of the stud will decrease, which may easily cause the risk of the torque-tension expansion bolt breaking during the anchoring process; for this reason, a threaded hole is directly set on the wedge-shaped section, and a connection method of directly threading the adjusting bolt and the threaded hole is adopted. When the torque-tension expansion bolt is anchored to the connecting hole, the nut is rotated to make the stud move axially out of the sleeve, and the wedge-shaped section squeezes the expansion section and The expansion section is expanded, and the width of the multiple expansion grooves gradually increases, and the outer diameter of the expansion section increases, thereby completing the anchoring between the torque-stretching expansion bolt and the connecting hole, and continuing to rotate the nut until the limit bolt and the limit plate are in contact, and the limit bolt limits the stud from continuing to move axially out of the sleeve, thereby completing the limitation of the stud, thereby avoiding excessive pressure between the expansion section and the connecting hole and damaging the connecting hole, thereby ensuring the friction between the expansion section and the connecting hole, ensuring the anchoring effect between the torque-stretching expansion bolt and the connecting hole, and at the same time ensuring the shear strength and torsional strength of the stud.

[0015] Preferably, a plurality of limiting grooves are provided in an annular array on one end of the limiting section away from the expansion section, and a plurality of limiting teeth are respectively arranged in the limiting grooves, the limiting plate is trumpet-shaped, and its opening faces the threaded section, the limiting plate includes a connecting portion and an arc portion, the adjusting bolt is connected to the connecting portion, and there are a plurality of arc portions, and a plurality of the arc portions are provided in an annular array on the outer ring side wall of the connecting portion, and the plurality of the arc portions are respectively embedded in a plurality of limiting grooves, and the arc portion is slidably connected to the limiting teeth, and the arc portion can be elastically deformed.

[0016] By arranging a limiting groove on the limiting section, in combination with the setting of a limiting piece with an elastic arc-shaped portion, and the maximum diameter of the limiting piece is greater than the diameter of the casing, when the torque-tension expansion bolt is inserted into the connecting hole, the end of the arc-shaped portion away from the connecting portion first abuts against the inner wall of the connecting hole, and the torque-tension expansion bolt continues to be inserted into the connecting hole. Since the limiting piece is in a trumpet shape with its opening facing the threaded section, the arc-shaped portion undergoes elastic deformation. During the process, the end of the arc-shaped portion away from the connecting portion slides and cooperates with the inner wall of the connecting hole, which does not affect the insertion of the torque-tension expansion bolt into the connecting hole. The locking nut is then tightened so that the bolt is in a position to move forward and backward, and the locking nut is then tightened so that the bolt is in a position to move forward and backward, and the locking nut is then tightened so that the bolt is in a position to move forward and backward, and the locking nut is then tightened so that the bolt is in a position to move forward and backward, and the locking nut is then tightened and turned.

[0017] Preferably, a tension spring is provided between the limiting plate and the stud, one end of the tension spring is connected to the limiting plate, and the other end is connected to the stud, and the tension spring is kept in a stretched state.

[0018] Since the arc-shaped portion is elastically deformable, through the setting of the tension spring, under the action of the spring force of the tension spring, it is ensured that the arc-shaped portion and the limiting tooth maintain an abutment state, and the limiting plate is maintained in a maximum diameter state, thereby ensuring the fitting effect of the limiting plate and the inner wall of the connecting hole, and ensuring the pre-positioning effect of the limiting plate on the torque-tension expansion bolt; at the same time, under the elastic force of the tension spring, when the stud loses the limiting effect of the nut and the sleeve, the distance between the stud and the limiting tooth is maintained at the minimum distance, thereby preventing the stud from squeezing the expansion section in a natural state, causing the diameter of the expansion section to be larger than the initial diameter, which affects the insertion of the torque-tension expansion bolt into the connecting hole, thereby ensuring the construction efficiency on site.

[0019] Preferably, a plurality of limiting protrusions are provided between adjacent expansion grooves, and the plurality of limiting protrusions are linearly evenly distributed in the axial direction of the casing, and the limiting protrusions are strip-shaped, and the length direction is perpendicular to the axial direction of the casing. By providing the limiting protrusions on the outer wall of the casing, when the torque-tension expansion bolt is anchored to the inner wall of the connecting hole, the limiting protrusions are embedded in the inner wall of the connecting hole, thereby ensuring the anchoring effect between the torque-tension expansion bolt and the connecting hole.

[0020] Preferably, the ends of the expansion grooves close to the limiting section are all provided with stress release holes, the stress release holes are circular, and the diameter of the stress release holes is greater than the width of the expansion grooves. In actual production, in order to reduce the production cost of torque-tension expansion bolts, the sleeves are usually rolled from sheet materials. By setting stress release holes on the end of the expansion groove close to the limiting section, it is beneficial to the rolling of the sleeves, and avoids the stress concentration on the end of the expansion groove close to the limiting section of the rolled sleeves, which causes tearing or deformation. At the same time, when the torque-tension expansion bolts are anchored to the connecting holes, the position of the stress release holes of the expansion section will produce flexural deformation due to the gradual increase in the outer diameter of the expansion section. By setting the stress release holes, the stress release holes provide a larger flexural space for the expansion section, and avoid the expansion section from tearing at the expansion groove, thereby ensuring the structural integrity of the sleeves and improving the service life of the torque-tension expansion bolts.

[0021] Preferably, the ends of the arc-shaped parts away from the connecting part are all provided with an embedded part, and the ends of the embedded parts away from the arc-shaped parts are all hardened by a local quenching process, and the hardness range is 52HRC to 58HRC. By providing the hardened embedded part at the end of the arc-shaped part away from the connecting part, the wear caused by the sliding friction between the limit plate and the inner wall of the connecting hole when the torque-stretching expansion bolt is inserted or recovered is reduced, and the limit plate is prevented from being excessively worn after repeated use, resulting in the outer diameter of the limit plate being reduced and the pre-positioning effect on the casing being lost, thereby ensuring the anchoring efficiency when anchoring the torque-stretching expansion bolt, and at the same time ensuring the anchoring effect between the torque-stretching expansion bolt and the connecting hole.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention provides a stud with a wedge section, a sleeve with a wedge surface and a limit section, and the expansion groove of the sleeve passes through one end close to the nut. Even if the expansion section is plastically deformed, the torque-stretching expansion bolt can still be recovered without damaging the inner diameter of the connecting hole. When the recovered torque-stretching expansion bolt continues to be used, there is no need to increase the aperture of the connecting hole, thereby ensuring the recovery and reuse of the torque-stretching expansion bolt and reducing the discard rate of the expansion bolt.

[0024] 2. The present invention sets a limit plate and an adjusting bolt. After the sleeve is fitted with the connecting hole, the nut continues to be rotated until the limit bolt abuts against the stud or the limit plate to limit the position. The limit bolt restricts the stud from continuing to move axially out of the sleeve, thereby completing the limitation of the stud, thereby avoiding excessive pressure between the expansion section and the connecting hole and damaging the connecting hole, thereby ensuring the friction between the expansion section and the connecting hole, and at the same time ensuring the structural safety of the stud and the bolt, thereby ensuring the anchoring effect between the torque-tensioning expansion bolt and the connecting hole.

[0025] 3. The present invention arranges a limiting groove on the sleeve, combined with the arrangement of a limiting plate with an elastic arc portion, and the maximum diameter of the limiting plate is larger than the diameter of the sleeve. When the torque-tension expansion bolt is inserted into the connecting hole, the limiting plate has a pre-positioning effect on the sleeve, thereby preventing the sleeve from rotating with the stud when the nut is rotated, causing a decrease in anchoring efficiency or a decrease in anchoring stability, thereby ensuring the anchoring efficiency when anchoring the torque-tension expansion bolt, and at the same time ensuring the anchoring effect between the torque-tension expansion bolt and the connecting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a torque tension expansion bolt in which the aspect ratio of the stud is less than or equal to 5 in the present invention;

[0027] Figure 2 An exploded diagram of a torque tension expansion bolt in which the aspect ratio of the stud is less than or equal to 5 in the present invention;

[0028] Figure 3 A schematic diagram of a torque tension expansion bolt with a stud length-to-diameter ratio of less than or equal to 5 in the present invention when connected to a Class II base;

[0029] Figure 4 for Figure 3 Full section view at AA in the middle;

[0030] Figure 5 for Figure 4 The enlarged view of point B in the figure;

[0031] Figure 6 for Figure 5 Schematic diagram of medium torque tensile expansion bolts after being anchored to a type of base;

[0032] Figure 7 It is a schematic diagram of the overall structure of a torque tension expansion bolt in which the aspect ratio of the stud is greater than 5 in the present invention;

[0033] Figure 8 An exploded view of a torque tension expansion bolt in which the aspect ratio of the stud is greater than 5 in the present invention;

[0034] Fig. 9 A schematic diagram of a torque tension expansion bolt with a stud length-to-diameter ratio greater than 5 in the present invention when connected to a Class II base;

[0035] Fig.10 for Fig. 9 Full section view at the middle CC;

[0036] Fig.11 for Fig.10 The enlarged view of point D in the figure;

[0037] Fig.12 for Fig.11 Schematic diagram of the medium torque tensile expansion bolt after anchoring to the Class II base.

[0038] In the figure: 1. stud; 101. threaded section; 102. wedge-shaped section; 103. threaded hole; 104. stepped hole; 1041. first-stage light hole; 1042. second-stage light hole; 2. sleeve; 201. expansion section; 2011. expansion groove; 2012. stress release hole; 2013. wedge-shaped surface; 2014. limiting protrusion; 202. limiting section; 2021. limiting tooth; 2022. limiting groove; 3. flat washer; 4. spring washer; 5. nut; 6. limiting plate; 601. connecting part; 602. arc-shaped part; 603. embedded part; 7. tension spring; 8. limiting bolt; 9. connecting seat; 901. connecting hole; 10. first-class base; 11. second-class base. DETAILED DESCRIPTION

[0039] See also Figures 1 to 12The present invention provides a torque tension expansion bolt, and the technical solution is as follows:

[0040] As a specific embodiment of the present invention, the aspect ratio of the stud 1 is 5. The torque tension expansion bolt with this aspect ratio is suitable for red brick walls, cement brick walls and concrete walls. The base 10 described below refers to the wall made of the above materials; please refer to Figures 1 to 6 A torque tension expansion bolt comprises a stud 1, a sleeve 2, a flat washer 3, a spring washer 4 and a nut 5. The stud 1 is coaxially sleeved in the sleeve 2, and one end extends outside the sleeve 2. The flat washer 3, the spring washer 4 and the nut 5 are all coaxially connected to the end of the stud 1 extending outside the sleeve 2. The sleeve 2 comprises an expansion section 201 and a limiting section 202. The limiting section 202 is located at the end of the sleeve 2 away from the nut 5. The inner wall of the expansion section 201 is a frustum-shaped wedge surface 2013. Five expansion grooves 2011 are arranged in an annular array on the side wall of the expansion section 201. The length directions of the five expansion grooves 2011 are all parallel to the axial direction of the sleeve 2 and completely penetrate the end of the expansion section 201 away from the limiting section 202. The five expansion grooves 2011 are all provided with stress release holes 212 at the ends close to the limiting section 202. , the stress release hole 2012 is circular, and the diameter of the stress release hole 2012 is greater than the width of the expansion groove 2011; five limiting protrusions 2014 are arranged between adjacent expansion grooves 2011, and the five limiting protrusions 2014 are linearly evenly distributed in the axial direction of the casing 2, the limiting protrusions 2014 are strip-shaped, and the length direction is perpendicular to the axial direction of the casing 2; the stud 1 includes a threaded section 101 and a wedge section 102, the wedge section 102 is slidably connected to the wedge surface 2013, and the taper of the wedge section 102 is the same as the taper of the wedge surface 2013, the threaded section 101 extends to the outside of the casing 2, and one end of the threaded section 101 is located in the casing 2, and five limiting teeth 2021 are arranged in an annular array on the end of the limiting section 202 away from the expansion section 201, and the five limiting teeth 2021 all extend into the casing 2.

[0041] See also Figures 3 to 5 A stepped hole 104 is coaxially provided in the stud 1, and the stepped hole 104 completely penetrates the stud 1. The stepped hole 104 includes a first light hole 1041 and a second light hole 1042. The inner diameter of the first light hole 1041 is larger than the inner diameter of the second light hole 1042, and the second light hole 1042 is located in the wedge-shaped section 102. An adjusting bolt is coaxially provided in the stepped hole 104, and one end of the adjusting bolt extends to the outside of the sleeve 2. The end of the adjusting bolt extending to the outside of the sleeve 2 is threadedly connected to a limiting plate 6. The diameter of the sleeve 2 is 16 mm, and the maximum diameter of the limiting plate 6 is 20 mm.

[0042] See also Figure 1 , Figure 2 and Figure 4, five limiting grooves 2022 are arranged in an annular array on one end of the limiting section 202 away from the expansion section 201, and five limiting teeth 2021 are respectively arranged in the limiting grooves 2022, the limiting piece 6 is trumpet-shaped, and the opening faces the threaded section 101, and a tension spring 7 is arranged between the limiting piece 6 and the stud 1, one end of the tension spring 7 is connected to the limiting piece 6, and the other end is connected to the stud 1, and the tension spring 7 is kept in a stretched state; the limiting piece 6 includes a connecting portion 601 and an arc portion 602, and the adjusting bolt is connected to the connecting portion 601 There are five arc-shaped portions 602, and the five arc-shaped portions 602 are arranged in a ring array on the outer ring side wall of the connecting portion 601, and the five arc-shaped portions 602 are respectively embedded in five limiting grooves 2022, and the arc-shaped portions 602 are slidingly connected to the limiting teeth 2021, and the arc-shaped portions 602 can be elastically deformed; the ends of the five arc-shaped portions 602 away from the connecting portion 601 are all provided with embedded portions 603, and the ends of the five embedded portions 603 away from the arc-shaped portions 602 are all hardened by a local quenching process, and the hardness range is 52HRC~58HRC.

[0043] How it works: See Figures 1 to 6 First, a connecting hole 901 is drilled on the connecting seat 9 and a type of base 10, and then the torque-tensioning expansion bolt is inserted into the connecting hole 901; when the torque-tensioning expansion bolt is inserted into the connecting hole 901, the outer end of the embedded portion 603 first abuts against the inner wall of the connecting hole 901, and the torque-tensioning expansion bolt is continued to be inserted into the connecting hole 901. The arc portion 602 undergoes elastic deformation. During the process, the embedded portion 603 slides with the inner wall of the connecting hole 901, and the arc portion 602 abuts against the limiting tooth 2021 until the flat washer 3 fits the surface of the connecting seat 9. At this time, the embedded portion 603 is embedded in the type of base 10, and the arc portion 602 maintains an abutting state with the limiting tooth 2021. The limiting sheet 6 has a pre-positioning effect on the sleeve 2, and the sleeve 2 cannot follow the stud when the nut 5 is turned. 1 rotates; then the nut 5 is rotated to make the stud 1 move axially out of the sleeve 2, the wedge section 102 squeezes the expansion section 201, and expands the expansion section 201, the width of the expansion groove 2011 gradually increases, and the outer diameter of the expansion section 201 increases; as the outer diameter of the expansion section 201 gradually increases, the limiting protrusion 2014 first fits with the inner wall of the connecting hole 901, and the nut 5 is continued to be rotated, the limiting protrusion 2014 is embedded in a type of base 10, and the outer wall of the expansion section 201 fits with the inner wall of the connecting hole 901 until the limiting bolt 8 abuts against the bottom of a light hole 1041, and the limiting bolt 8 limits the stud 1 from continuing to move axially out of the sleeve 2, thereby completing the limiting of the stud 1, thereby completing the anchoring between the torque tension expansion bolt and the connecting hole 901

[0044] As another specific embodiment of the present invention, different from the previous specific embodiment, in this specific embodiment, the aspect ratio of the stud 1 is 10. The torque tension expansion bolt with this aspect ratio is suitable for concrete floors, ceilings and concrete seats. The second type of base 11 described below refers to the concrete base of the above material; please refer to Figures 7 to 12 A torque tension expansion bolt comprises a stud 1, a sleeve 2, a flat washer 3, a spring washer 4 and a nut 5. The stud 1 is coaxially sleeved in the sleeve 2, and one end extends outside the sleeve 2. The flat washer 3, the spring washer 4 and the nut 5 are all coaxially connected to the end of the stud 1 extending outside the sleeve 2. The sleeve 2 comprises an expansion section 201 and a limiting section 202. The limiting section 202 is located at the end of the sleeve 2 away from the nut 5. The inner wall of the expansion section 201 is a frustum-shaped wedge surface 2013. Five expansion grooves 2011 are arranged in an annular array on the side wall of the expansion section 201. The length directions of the five expansion grooves 2011 are all parallel to the axial direction of the sleeve 2 and completely penetrate the end of the expansion section 201 away from the limiting section 202. The five expansion grooves 2011 are all provided with stress release holes 212 at the ends close to the limiting section 202. , the stress release hole 2012 is circular, and the diameter of the stress release hole 2012 is greater than the width of the expansion groove 2011; five limiting protrusions 2014 are arranged between adjacent expansion grooves 2011, and the five limiting protrusions 2014 are linearly evenly distributed in the axial direction of the casing 2, the limiting protrusions 2014 are strip-shaped, and the length direction is perpendicular to the axial direction of the casing 2; the stud 1 includes a threaded section 101 and a wedge section 102, the wedge section 102 is slidably connected to the wedge surface 2013, and the taper of the wedge section 102 is the same as the taper of the wedge surface 2013, the threaded section 101 extends to the outside of the casing 2, and one end of the threaded section 101 is located in the casing 2, and five limiting teeth 2021 are arranged in an annular array on the end of the limiting section 202 away from the expansion section 201, and the five limiting teeth 2021 all extend into the casing 2.

[0045] See also Figures 9 to 11 A threaded hole 103 is coaxially formed on one end of the wedge-shaped segment 102 away from the threaded segment 101, and an adjusting bolt is threadedly connected to the threaded hole 103, and one end of the adjusting bolt extends to the outside of the sleeve 2. The end of the adjusting bolt extending outside the sleeve 2 is connected to a limiting plate 6, the diameter of the sleeve 2 is 16, and the maximum diameter of the limiting plate 6 is 20.

[0046] See also Figure 7 , Figure 8 and Fig.10, five limiting grooves 2022 are arranged in an annular array on one end of the limiting section 202 away from the expansion section 201, and five limiting teeth 2021 are respectively arranged in the limiting grooves 2022. The limiting piece 6 is trumpet-shaped, and its opening faces the threaded section 101. A tension spring 7 is arranged between the limiting piece 6 and the stud 1. One end of the tension spring 7 is connected to the limiting piece 6, and the other end is connected to the positioning seat or the stud 1, and the tension spring 7 is kept in a stretched state; the limiting piece 6 includes a connecting portion 601 and an arc portion 602, and the adjusting bolt is connected to the connecting portion 601 Connection, the number of arc-shaped portions 602 is five, and the five arc-shaped portions 602 are arranged in a ring array on the outer ring side wall of the connecting portion 601, and the five arc-shaped portions 602 are respectively embedded in five limiting grooves 2022, and the arc-shaped portions 602 are slidingly connected with the limiting teeth 2021, and the arc-shaped portions 602 can be elastically deformed; the ends of the five arc-shaped portions 602 away from the connecting portion 601 are all provided with embedded portions 603, and the ends of the five embedded portions 603 away from the arc-shaped portions 602 are all hardened by a local quenching process, and the hardness range is 52HRC~58HRC.

[0047] How it works: See Figures 7 to 12 , first drill a connecting hole 901 on the connecting seat 9 and the second type base 11, and then insert the torque-tensioning expansion bolt into the connecting hole 901; when the torque-tensioning expansion bolt is inserted into the connecting hole 901, the outer end of the embedded portion 603 first abuts against the inner wall of the connecting hole 901, and the torque-tensioning expansion bolt is continued to be inserted into the connecting hole 901, and the arc portion 602 undergoes elastic deformation. During the process, the embedded portion 603 slides with the inner wall of the connecting hole 901, and the arc portion 602 abuts against the limiting tooth 2021 until the flat washer 3 fits the surface of the connecting seat 9. At this time, the embedded portion 603 is embedded in the second type base 11, and the arc portion 602 maintains an abutting state with the limiting tooth 2021. The limiting sheet 6 has a pre-positioning effect on the sleeve 2, and the sleeve 2 cannot follow when the nut 5 is turned. As the stud 1 rotates, the nut 5 is then rotated to make the stud 1 move axially out of the sleeve 2. The wedge section 102 squeezes the expansion section 201 and expands the expansion section 201. The width of the expansion groove 2011 gradually increases, and the outer diameter of the expansion section 201 increases. As the outer diameter of the expansion section 201 gradually increases, the limiting protrusion 2014 first fits with the inner wall of the connecting hole 901, and the nut 5 is continued to be rotated. The limiting protrusion 2014 is embedded in the second type base 11, and the outer wall of the expansion section 201 fits with the inner wall of the connecting hole 901 until the limiting bolt 8 fits with the limiting plate 6. The limiting bolt 8 limits the stud 1 from continuing to move axially out of the sleeve 2, thereby completing the limiting of the stud 1, thereby completing the anchoring between the torque-tensioning expansion bolt and the connecting hole 901.

[0048] The above two specific embodiments of the present invention are described in detail in conjunction with the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the scope of the present invention should still fall within the protection scope of the present invention.

Claims

1. A torque tension expansion bolt, comprising a stud (1), a sleeve (2), a flat washer (3), a spring washer (4) and a nut (5), wherein the stud (1) is coaxially sleeved in the sleeve (2), and the flat washer (3), the spring washer (4) and the nut (5) are all coaxially connected to the stud (1), characterized in that: The sleeve (2) comprises an expansion section (201) and a limiting section (202), wherein the limiting section (202) is located at one end of the sleeve (2) away from the nut (5), the inner wall of the expansion section (201) is a frustoconical wedge-shaped surface (2013), a plurality of expansion grooves (2011) are arranged in an annular array on the side wall of the expansion section (201), and the plurality of expansion grooves (2011) all penetrate one end of the expansion section (201) away from the limiting section (202), the stud (1) comprises a threaded section (101) and a wedge-shaped section (102), the wedge-shaped section (102) is slidably connected to the wedge-shaped surface (2013), and the taper of the wedge-shaped section (102) is the same as that of the threaded section (101). The taper of the wedge-shaped surface (2013) is the same, the threaded section (101) extends to the outside of the sleeve (2), and one end of the threaded section (101) is located in the sleeve (2), and a plurality of limiting teeth (2021) are arranged in an annular array on the end of the limiting section (202) away from the expansion section (201), and the plurality of limiting teeth (2021) all extend into the sleeve (2), and a limiting component is arranged on the end of the wedge-shaped section (102) away from the threaded section (101), and the limiting component is designed so that after the stud (1) extends out of the sleeve (2) to a set length, the limiting component and the limiting teeth (2021) are in contact and limit the stud (1) from continuing to move out of the sleeve (2).

2. A torque tension expansion bolt according to claim 1, characterized in that: The limiting assembly comprises a limiting plate (6) and an adjusting bolt. A stepped hole (104) is coaxially provided in the stud (1). The stepped hole (104) completely penetrates the stud (1). The stepped hole (104) comprises a first light hole (1041) and a second light hole (1042). The inner diameter of the first light hole (1041) is larger than the inner diameter of the second light hole (1042), and the second light hole (1042) is located in the wedge-shaped section (102). The adjusting bolt is coaxially arranged in the stepped hole (104), and one end of the adjusting bolt extends to the outside of the sleeve (2). The limiting plate (6) is threadedly connected to the end of the adjusting bolt extending to the outside of the sleeve (2). The diameter of the sleeve (2) is D1, and the maximum diameter of the limiting plate (6) is D2, wherein 1 mm≤D2-D1≤4 mm.

3. The torque tension expansion bolt according to claim 1, characterized in that: The limiting assembly comprises a limiting plate (6) and an adjusting bolt. A threaded hole (103) is coaxially formed on one end of the wedge-shaped segment (102) away from the threaded segment (101). The adjusting bolt is threadedly connected to the threaded hole (103), and one end of the adjusting bolt extends to the outside of the sleeve (2). The limiting plate (6) is connected to the end of the adjusting bolt extending to the outside of the sleeve (2). The diameter of the sleeve (2) is D1, and the maximum diameter of the limiting plate (6) is D2, wherein 1mm≤D2-D1≤4mm.

4. A torque tension expansion bolt according to claim 2 or 3, characterized in that: A plurality of limiting grooves (2022) are arranged in an annular array on one end of the limiting section (202) away from the expansion section (201), and a plurality of limiting teeth (2021) are respectively arranged in the limiting grooves (2022); the limiting plate (6) is trumpet-shaped, and its opening faces the threaded section (101); the limiting plate (6) comprises a connecting portion (601) and an arc portion (602); the adjusting bolt is connected to the connecting portion (601); a plurality of the arc portions (602) are arranged in an annular array on the outer ring side wall of the connecting portion (601); the plurality of the arc portions (602) are respectively embedded in the plurality of limiting grooves (2022); the arc portions (602) are slidably connected to the limiting teeth (2021); and the arc portions (602) are elastically deformable.

5. A torque tension expansion bolt according to claim 4, characterized in that: A tension spring (7) is provided between the limiting plate (6) and the stud (1), one end of the tension spring (7) is connected to the limiting plate (6), and the other end is connected to the stud (1), and the tension spring (7) is kept in a stretched state.

6. The torque tension expansion bolt according to claim 1, characterized in that: A plurality of limiting protrusions (2014) are provided between adjacent expansion grooves (2011), and the plurality of limiting protrusions (2014) are linearly evenly distributed in the axial direction of the sleeve (2). The limiting protrusions (2014) are strip-shaped, and the length direction is perpendicular to the axial direction of the sleeve (2).

7. A torque tension expansion bolt according to claim 6, characterized in that: A stress release hole (2012) is provided at one end of the plurality of expansion grooves (2011) close to the limiting section (202); the stress release hole (2012) is circular, and the diameter of the stress release hole (2012) is greater than the width of the expansion groove (2011).

8. The torque tension expansion bolt according to claim 4, characterized in that: An embedded portion (603) is provided at one end of the plurality of arc-shaped portions (602) away from the connecting portion (601), and an end of the plurality of embedded portions (603) away from the arc-shaped portion (602) is hardened by a local quenching process, with a hardness range of 52HRC to 58HRC.

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