High-strength bolt connection pair

Abstract

The invention relates to the technical field of bolt connection, and particularly discloses a high-strength bolt connection pair which comprises an outer screw rod and outer threads arranged at the bottom of the outer screw rod, the outer screw rod is sleeved with a first gasket and a second gasket, and the bottom of the outer screw rod is sleeved with a screw cap. The inner wall of the screw cap is provided with a first inner screw groove which is matched and screwed with the outer screw teeth, the top of the screw cap is movably connected with a connecting ring, the inner wall of the connecting ring is provided with two symmetrical positioning grooves, and the middle position of the bottom of the outer screw rod is provided with a second inner screw groove. Double screw joint fixation is formed, the connecting stability of the screw cap and the outer screw rod is guaranteed, a structure for preventing the screw cap from loosening is arranged, the problem that the screw cap rotates due to vibration is solved, the fastening effect of the whole bolt connecting pair is fully improved, the permanent fixing performance is guaranteed, the screw joint area is completely covered with the screw cap, and the screw joint effect is improved. And the problems of corrosion and the like caused by environmental influence due to long-time exposure of the screw joint part are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of bolt connection, in particular to a high-strength bolt connection pair. Background Art

[0002] A bolt is a cylindrical threaded mechanical fastener that is matched with a nut. It is a type of fastener consisting of a head and a screw (a cylinder with external threads). It is used to fasten and connect two parts with through holes. Ordinary bolts and nuts often loosen when used, so high-strength bolts came into being. The full name of high-strength bolts in production is high-strength bolt connection pairs, generally referred to as high-strength bolts. Each connection pair includes a bolt, a nut and two washers. The friction and adhesion of the washers ensure that the bolt connection is in a certain tightening state to prevent the connection pair from loosening or deformation. As an indispensable and important part of mechanical equipment and engineering structures, the installation quality and effect of the connection pair directly affect the stability and performance of the entire system.

[0003] After searching, the invention patent with publication number CN115306811B discloses a bolt with a disassembly assembly, including a bolt body and a disassembly assembly, the bolt body includes an outer screw, a nut threadedly connected to the outer wall of the outer screw, and an inner screw, the inner part of the outer screw is provided with a first cavity and a second cavity, the upper part of the first cavity is connected to the second cavity, the bottom of the first cavity passes through the bottom end of the outer screw, the inner screw is threadedly connected to the first cavity, an anti-loosening assembly is provided in the second cavity, the anti-loosening assembly includes anti-loosening blocks respectively arranged on both sides of the second cavity, and the disassembly assembly includes an insert rod, a push rod and a disassembly rod. The present invention can improve the installation firmness of the bolt, ensure the anti-loosening effect of the bolt, and facilitate disassembly.

[0004] In combination with the above patents, it is found that the prior art has the following shortcomings: the prior art adopts a connection method in which the nut and the bolt are directly screwed together, and there is no structure on the entire bolt connection pair to fix the nut and prevent it from loosening. When mechanical equipment is subjected to long-term severe vibration, the fastening effect of the bolt connection pair will still be affected, and a permanent fixing effect cannot be guaranteed. Moreover, the thread connection between the nut and the bolt is exposed to the outside for a long time, and will also cause rust and other problems due to environmental influences, making subsequent disassembly and assembly inconvenient. Therefore, a high-strength bolt connection pair is urgently needed to solve the above problems. Summary of the invention

[0005] In view of the problems in the related technology, the present invention proposes a high-strength bolt connection pair to overcome the above-mentioned technical problems existing in the existing related technology. The advantages are: forming a double threaded fixation to ensure the stable connection performance between the screw cap and the outer screw, and being able to provide a structure on the entire bolt connection pair to prevent the screw cap from loosening to prevent the screw cap from rotating due to vibration, thereby fully improving the fastening effect of the entire bolt connection pair and ensuring permanent fixing performance.

[0006] The technical solution of the present invention is achieved in this way: A high-strength bolt connection pair, comprising an external screw and an external threaded tooth arranged at the bottom of the external screw, the external screw being respectively sleeved with a first washer and a second washer, and the bottom of the external screw being sleeved with a screw cover, the inner wall of the screw cover being provided with a first internal threaded groove adapted to be screwed with the external threaded tooth, the top of the screw cover being movably connected with a connecting ring, and the inner wall of the connecting ring being provided with two symmetrical positioning grooves, a second internal threaded groove being provided at the middle position of the bottom of the external screw, and a docking hole being provided at the top of the second internal threaded groove, an internal screw inserted into the second internal threaded groove and the docking hole being fixed at the middle position of the inner wall of the bottom of the screw cover, and the outer wall of the internal screw being provided with an internal threaded tooth adapted to be screwed with the second internal threaded groove, the middle position of the internal screw and the screw cover being provided with an internal threaded tooth adapted to be screwed with the second internal threaded groove A through hole is provided in the middle position of the bottom of the cover, and a push-pull rod is inserted into the through hole, a push-pull frame is fixed to one end of the push-pull rod, a cavity is provided at the end of the inner screw that contacts the screw cover, and an annular ring inserted in the cavity is fixed to the outer wall of the push-pull rod, a spring sleeved on the outer wall of the push-pull rod is fixed to one side of the annular ring and the inner wall of the cavity, the inner wall of the through hole and the outer wall of the inner screw are provided with two symmetrical first through grooves, and the inner wall of the docking hole and the outer wall of the outer screw are provided with second through grooves distributed at equal distances, the inner walls of the first through grooves are rotatably connected to a positioning key rod through a pin shaft, the bottom end of the positioning key rod is provided with tooth grooves distributed at equal distances, and a double-sided rack meshing with the tooth grooves is fixed to the other end of the push-pull rod.

[0007] Through the above technical scheme: under the clamping action of the positioning key rod and the positioning groove, a structure for preventing the screw cap from loosening can be set on the entire bolt connection pair to prevent the screw cap from rotating due to vibration. On the one hand, the fastening effect of the entire bolt connection pair is fully improved to ensure permanent fixing performance. On the other hand, the entire anti-loosening structure has the performance of easy disassembly and assembly, so that the entire bolt connection pair also has the performance of easy disassembly and assembly.

[0008] The present invention is further configured such that the inner diameter of the connecting ring, the inner diameter of the first washer and the inner diameter of the second washer are all larger than the outer diameter of the external thread, and the outer wall of the connecting ring is provided with wrench slots which are equidistantly distributed in an annular shape.

[0009] Through the above technical solution: the first washer, the second washer and the connecting ring can be smoothly sleeved on the outer screw, and the position of the connecting ring can be conveniently rotated by using the wrench slot in combination with the wrench.

[0010] The present invention is further configured such that one end of the positioning key rod extends out of the second through slot and is clamped on one end of the inner wall of the positioning slot, and the width of the positioning key rod is the same as the width of the first through slot, and the inner wall of one side of the positioning slot is designed to be an arc surface.

[0011] Through the above technical solution: it is convenient for the positioning key rod to be screwed into the positioning groove.

[0012] The present invention is further configured such that the inner screw is composed of a rod body and a joint, and a matching groove is opened in the middle position of the bottom of the outer screw, the outer wall of the joint is adapted to the inner wall of the matching groove, and the side surface of the joint and the inner wall of the matching groove are both designed to be inclined.

[0013] Through the above technical solution, the joint portion is engaged with the anastomotic groove, so that the inner screw and the outer screw can be connected in a state that is not easy to loosen.

[0014] The present invention is further configured such that the length of the first internal screw groove is greater than the length of the external screw thread, and the length of the second internal screw groove is greater than the length of the internal screw thread.

[0015] Through the above technical solution: the movable range of the screw cover is increased, making it convenient to reinforce parts with different thicknesses.

[0016] The present invention is further configured such that a plurality of connection holes are provided at the bottom of the screw cover, and magnetic blocks are fixedly provided on the inner walls of the connection holes, and the magnetic blocks are fixedly adsorbed to the push-pull frame.

[0017] Through the above technical solution: the push-pull frame can be fixed, the stability of the positioning key rod in the first through groove is guaranteed, and the screw-in operation of the screw cover and the inner screw is convenient.

[0018] The present invention is further configured such that a hexagonal screw ring is fixed to the outer wall of the screw cover, and an annular limiting groove is opened at the bottom of the connecting ring, and a limiting ring is fixed to the top of the screw cover and is clamped in the limiting groove, and the cross-section of the limiting ring and the cross-section of the limiting groove are both designed to be T-shaped.

[0019] Through the above technical solution, a structure that facilitates movement is generated between the connecting ring and the screw cover, so that the movable performance of the connecting ring is better.

[0020] The present invention is further configured such that the top of the connecting ring is provided with mounting grooves which are distributed at equal distances, and the inner walls of the mounting grooves are rotatably connected with rolling balls, the bottoms of the rolling balls are fitted to the bottoms of the mounting grooves, and the second gasket is placed on the rolling balls.

[0021] Through the above technical scheme: it is more convenient for the connecting ring to rotate between the second washer and the screw cover, and the problem of inconvenient adjustment due to the tightening effect will not occur. The friction between the connecting ring and the second washer can also be reduced, and the phenomenon that the second washer also rotates significantly when the connecting ring and the screw cover rotates will not occur, which makes it easy to protect the second washer and prevent it from being damaged by friction.

[0022] The present invention is further configured such that a supporting head is fixed to the top end of the external screw, and a hexagonal nut is fixed to the top of the supporting head.

[0023] Through the above technical solution: a wrench is used in conjunction with a hexagonal nut to facilitate the disassembly and assembly of the external screw.

[0024] The present invention is further configured such that a hexagonal inner groove is provided at a middle position of the top of the hexagonal nut, and a flat opening is provided at a middle position of the hexagonal inner groove.

[0025] Through the above technical solution: a variety of disassembly and assembly tools such as hexagonal wrenches and flat-blade screwdrivers can be used to carry out disassembly and assembly operations of the entire bolt connection pair, so that the problem of disassembly inconvenience caused by damage to the nut will not occur, thereby improving the performance of the entire bolt connection pair.

[0026] Beneficial effects of the present invention: The present invention provides a high-strength bolt connection pair, which is composed of an outer screw, a first washer, a supporting head, a hexagonal nut, a second washer, a connecting ring, a screw cover, a hexagonal screw ring, a first inner screw groove, an inner screw, an inner thread, an outer thread and a second inner screw groove, etc. The screw cover and the outer screw are doubly screwed and fixed by using the first inner screw groove and the outer thread as well as the second inner screw groove and the inner thread, thereby ensuring the stable connection performance between the screw cover and the outer screw and preliminarily preventing the problem of loosening of the entire bolt connection pair.

[0027] The invention provides a high-strength bolt connection pair, which cooperates with the screw cover, inner screw, through hole, push-pull rod, push-pull frame, magnetic block, first through groove, second through groove, positioning groove, positioning key rod, tooth groove, double-sided rack and spring. When the screw cover is screwed with the outer screw, the push-pull frame and the magnetic block are pushed to be adsorbed and fixed, driving the push-pull rod to move, and the positioning key rod is driven to rotate and enter the first through groove through the meshing action of the double-sided rack and the tooth groove, so that the spring is compressed, which makes it convenient to screw the inner screw into the second inner screw groove, and also convenient to insert one end of the inner screw into the docking hole. Thereafter, the push-pull frame is pulled, so that the push-pull frame, the push-pull rod, the double-sided rack and the positioning key rod are gradually reset under the reset action of the spring, and the angle of the screw cover is further adjusted. When the screw cap is in the locked position, the second through slot will be aligned with the first through slot, so that the positioning key rod will emerge from the second through slot under the resetting action, and one end of the positioning key rod will fit against the inner wall of the connecting ring. The connecting ring can be rotated to make the end of the positioning key rod fit into the positioning slot, so that the connecting ring and the positioning key rod can be fixed. Therefore, under the clamping action of the positioning key rod and the positioning slot, a structure for preventing the screw cap from loosening can be provided on the entire bolt connection pair to prevent the screw cap from rotating due to vibration. On the one hand, the fastening effect of the entire bolt connection pair is fully improved to ensure permanent fixing performance. On the other hand, the entire anti-loosening structure is easy to disassemble and assemble, so that the entire bolt connection pair is also easy to disassemble and assemble.

[0028] The high-strength bolt connection pair provided by the present invention can completely cover the screw connection area by means of the provided screw cover, the first inner screw groove and the inner screw thread when the screw cover is screwed onto the outer screw rod, thereby preventing the screw connection from being exposed to the external environment for a long time and causing rust and other problems, making subsequent disassembly and assembly more convenient.

[0029] The present invention provides a high-strength bolt connection pair, which, through the provision of a connecting ring, a limiting groove, a limiting ring, a rolling ball and a second washer, on the one hand makes it easier for the connecting ring to rotate between the second washer and the screw cover, and does not cause the problem of inconvenient adjustment due to the tightening effect; on the other hand, it can reduce the friction between the connecting ring and the second washer, and does not cause the second washer to rotate significantly when the connecting ring and the screw cover rotate, thereby facilitating the protection of the second washer and preventing it from being damaged by friction.

[0030] The high-strength bolt connection pair provided by the present invention can use a variety of disassembly and assembly tools to carry out disassembly and assembly operations of the entire bolt connection pair by means of the hexagonal nut, the hexagonal inner groove and the flat mouth, so that the problem of inconvenience in disassembly due to damage to the nut will not occur, thereby improving the performance of the entire bolt connection pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 The figure is a schematic diagram of the overall structure of a high-strength bolt connection pair of the present invention.

[0033] Figure 2 The present invention is a front cross-sectional view of a high-strength bolt connection pair.

[0034] Figure 3 The present invention is a schematic diagram of the structure of an inner screw rod and a positioning key rod of a high-strength bolt connection pair.

[0035] Figure 4 The present invention is a schematic diagram of a limit ring and a connection hole structure of a high-strength bolt connection pair.

[0036] Figure 5 The present invention is a schematic diagram of the limit groove and installation groove structure of a high-strength bolt connection pair.

[0037] Figure 6 The present invention is a schematic diagram of the second through groove and the second inner thread groove structure of a high-strength bolt connection pair.

[0038] Figure 7 The present invention is a bottom cross-sectional view of a high-strength bolt connection pair.

[0039] Figure 8 The present invention is a cross-sectional view of an outer screw of a high-strength bolt connection pair.

[0040] Fig. 9 The present invention is a schematic diagram of the structure of a rod body and a joint portion of a high-strength bolt connection pair.

[0041] Fig.10 The present invention is a schematic diagram of an annular ring and tooth groove structure of a high-strength bolt connection pair.

[0042] In the figure: 1. External screw; 2. First washer; 3. Support head; 4. Hexagonal nut; 5. Internal hexagonal groove; 6. Flat mouth; 7. Second washer; 8. Connecting ring; 9. Screw cover; 10. Hexagonal screw ring; 11. Push-pull frame; 12. Wrench slot; 13. First internal screw groove; 14. Magnetic block; 15. Push-pull rod; 16. Internal screw; 1601. Rod body; 1602. Joint; 17. Internal thread ; 18. Limiting ring; 19. Positioning groove; 20. Positioning key rod; 21. Rolling ball; 22. External screw thread; 23. Through hole; 24. First through groove; 25. Connecting hole; 26. Limiting groove; 27. Mounting groove; 28. Second through groove; 29. ​​Matching groove; 30. Second internal screw groove; 31. Spring; 32. Double-sided rack; 33. Docking hole; 34. Cavity; 35. Annular ring; 36. Tooth groove. DETAILED DESCRIPTION

[0043] The technical solution of the present application is further described in detail below in conjunction with specific implementation methods.

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. Example

[0047] According to an embodiment of the present invention, See also Figure 1-10A high-strength bolt connection pair comprises an external screw rod 1 and an external thread 22 arranged at the bottom of the external screw rod 1, a supporting head 3 is fixed to the top of the external screw rod 1, and a hexagonal nut 4 is fixed to the top of the supporting head 3, a first washer 2 and a second washer 7 are respectively sleeved on the external screw rod 1, and a screw cover 9 is sleeved on the bottom of the external screw rod 1, and the inner wall of the screw cover 9 is provided with a first inner thread groove 13 which is screwed with the external thread 22, and the screw cover 9 is screwed on the external screw rod 1 so that the screw cover 9 completely covers the screw connection area, so as to avoid the screw connection being exposed to the external environment for a long time and causing rust and other problems, so that the subsequent disassembly and assembly are more convenient, the top of the screw cover 9 is movably connected with a connecting ring 8, the outer wall of the screw cover 9 is fixed with a hexagonal screw ring 10, and the bottom of the connecting ring 8 is provided with an annular A limiting groove 26, a limiting ring 18 is fixed on the top of the screw cover 9 and is clamped in the limiting groove 26. The cross-section of the limiting ring 18 and the cross-section of the limiting groove 26 are both designed to be T-shaped, and the inner wall of the connecting ring 8 is provided with two symmetrical positioning grooves 19, a second inner screw groove 30 is provided in the middle position of the bottom of the outer screw 1, and a docking hole 33 is provided on the top of the second inner screw groove 30, and an inner screw 16 inserted into the second inner screw groove 30 and the docking hole 33 is fixed in the middle position of the inner wall of the bottom of the screw cover 9. The first inner screw groove 13 and the outer screw teeth 22 and the second inner screw groove 30 and the inner screw teeth 17 are used to perform double screw connection and fixation on the screw cover 9 and the outer screw 1, thereby ensuring the stable connection performance between the screw cover 9 and the outer screw 1, and preliminarily preventing the problem of loosening of the entire bolt connection pair. The inner screw 16 is composed of a rod body 1601 and a joint 1602, and a matching groove 29 is provided at the middle position of the bottom of the outer screw 1, the outer wall of the joint 1602 is matched with the inner wall of the matching groove 29, the side surface of the joint 1602 and the inner wall of the matching groove 29 are designed to be inclined, and the outer wall of the inner screw 16 is provided with an inner screw tooth 17 that is matched with the second inner screw groove 30 and is screwed, the length of the first inner screw groove 13 is greater than the length of the outer screw tooth 22, the length of the second inner screw groove 30 is greater than the length of the inner screw tooth 17, a through hole 23 is provided at the middle position of the inner screw 16 and the middle position of the bottom of the screw cover 9, and a push-pull rod 15 is inserted into the inside of the through hole 23, one end of the push-pull rod 15 is fixed with a push-pull frame 11, and the inner screw 16 contacts the screw cover 9 at one end. A cavity 34 is opened at the end, and an annular ring 35 inserted in the cavity 34 is fixed on the outer wall of the push-pull rod 15, and a spring 31 sleeved on the outer wall of the push-pull rod 15 is fixed on one side of the annular ring 35 and the inner wall of the cavity 34. The inner wall of the through hole 23 and the outer wall of the inner screw 16 are provided with two symmetrical first through grooves 24, and the inner wall of the docking hole 33 and the outer wall of the outer screw 1 are provided with second through grooves 28 distributed at equal distances. The inner walls of the first through grooves 24 are rotatably connected to the positioning key rod 20 through a pin shaft, and the bottom ends of the positioning key rods 20 are provided with tooth grooves 36 distributed at equal distances, and the other end of the push-pull rod 15 is fixed with a double-sided rack 32 meshing with the tooth grooves 36. One end of the positioning key rod 20 extends out of the second through groove 28 and is clamped in one end of the inner wall of the positioning groove 19.The width of the positioning key rod 20 is the same as the width of the first through groove 24, and the inner wall of one side of the positioning groove 19 is designed to be an arc surface, so that the end of the positioning key rod 20 can be inserted into the positioning groove 19 to fix the connecting ring 8 and the positioning key rod 20, so that under the clamping action of the positioning key rod 20 and the positioning groove 19, the entire bolt connection pair is provided with a structure for preventing the screw cover 9 from loosening, preventing the screw cover 9 from rotating due to vibration, on the one hand, fully improving the fastening effect of the entire bolt connection pair, and achieving permanent fixing performance, on the other hand, the entire anti-loosening structure has the performance of easy disassembly and assembly, so that the entire bolt connection pair also has the performance of easy disassembly and assembly.

[0048] In order to facilitate the installation of the first gasket 2, the second gasket 7 and the connecting ring 8, refer to Figure 1 and Figure 2 The inner diameters of the connecting ring 8, the first washer 2 and the second washer 7 are all larger than the outer diameter of the external thread 22, and the outer wall of the connecting ring 8 is provided with wrench slots 12 which are equidistantly distributed in an annular shape, so that the first washer 2, the second washer 7 and the connecting ring 8 can be smoothly mounted on the external screw 1, and the wrench slots 12 are used in conjunction with a wrench to facilitate the rotation of the position of the connecting ring 8.

[0049] In order to facilitate the installation of screw cap 9, refer to Figure 2 , Figure 3 and Figure 4 A plurality of connection holes 25 are provided at the bottom of the screw cover 9, and a magnetic block 14 is fixedly provided on the inner wall of the connection hole 25. The magnetic block 14 is adsorbed and fixed to the push-pull frame 11. The above-mentioned magnetic block 14 can fix the push-pull frame 11, ensure the stable performance of the positioning key rod 20 in the first through groove 24, and facilitate the screwing operation of the screw cover 9 and the inner screw 16. Example

[0050] Referring to the figures, compared with the first embodiment, the present embodiment has the following structure added: the top of the connecting ring 8 is provided with mounting grooves 27 which are equally spaced, and the inner walls of the mounting grooves 27 are rotatably connected with balls 21, the bottom of the balls 21 are fitted to the bottom of the mounting grooves 27, and the second gasket 7 is placed on the balls 21, so that the connecting ring 8 can be more conveniently rotated between the second gasket 7 and the screw cover 9, and the problem of inconvenience in adjustment due to the tightening effect will not occur. The friction between the connecting ring 8 and the second gasket 7 can also be reduced, and the phenomenon of the second gasket 7 also rotating greatly when the connecting ring 8 and the screw cover 9 rotates will not occur, which is convenient for protecting the second gasket 7 and preventing it from being damaged by friction. Example

[0051] Referring to the drawings, compared with the first embodiment, the present embodiment is additionally provided with the following structure: a hexagonal slot 5 is provided at the middle position of the top of the hexagonal nut 4, and a flat opening 6 is provided at the middle position of the hexagonal slot 5, so that a hexagonal wrench and a flat screwdriver can be used to carry out the disassembly and assembly of the entire bolt connection pair.

[0052] In summary, with the aid of the above technical solution of the present invention, the working principle of the present invention is as follows: the entire high-strength bolt connection pair is formed by the cooperation of the external screw 1, the first washer 2, the supporting head 3, the hexagonal nut 4, the second washer 7, the connecting ring 8, the screw cover 9, the hexagonal screw ring 10, the first inner screw groove 13, the inner screw 16, the inner screw thread 17, the external screw thread 22 and the second inner screw groove 30, etc. After the external screw 1 passes through the part with a hole, the user pushes the push-pull frame 11 and the magnetic suction block 14 for adsorption and fixation, driving the push-pull rod 15 to move, and the double-sided rack 32 and the gear are connected. The meshing action of the groove 36 drives the positioning key rod 20 to rotate and enter the first through groove 24, so that the spring 31 is compressed. At this time, the screw cover 9 is screwed with the external screw rod 1, that is, the external screw thread 22 is screwed on the first internal screw groove 13, and the internal screw rod 16 and the internal screw thread 17 are screwed into the second internal screw groove 30, so that one end of the internal screw rod 16 is conveniently inserted into the docking hole 33, and then the push-pull frame 11 is pulled, so that the push-pull frame 11, the push-pull rod 15, the double-sided rack 32 and the positioning key rod 20 are gradually reset under the reset action of the spring 31, and the angle of the screw cover 9 is further adjusted. When the second through slot 28 is in the same position as the first through slot 24, the positioning key rod 20 emerges from the second through slot 28 under the reset action, and one end of the positioning key rod 20 is fitted to the inner wall of the connecting ring 8. Then, the user rotates the connecting ring 8 so that the end of the positioning key rod 20 is inserted into the positioning slot 19 to fix the connecting ring 8 and the positioning key rod 20. Therefore, under the clamping action of the positioning key rod 20 and the positioning slot 19, the entire bolt connection pair is provided with a structure for preventing the screw cover 9 from loosening, so as to prevent the screw cover 9 from vibrating. The self-rotation problem is eliminated, so that the screw cover 9 and the external screw 1 form a double screw connection and anti-loosening structure, which ensures the stable connection performance of the screw cover 9 and the external screw 1, and can make the screw cover 9 completely cover the screw connection area when the screw cover 9 is screwed on the external screw 1, so as to avoid the screw connection being exposed to the external environment for a long time and causing rust and other problems. When disassembling, the user pulls the push-pull frame 11 to move the positioning key rod 20 into the first through groove 24, and uses the hexagonal nut 4, the inner hexagonal groove 5 and the flat mouth 6 as well as a variety of disassembly and assembly tools to perform the disassembly and assembly operation of the entire bolt connection pair.

[0053] The above description is only a preferred embodiment of a high-strength bolt connection pair of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength bolt connection pair, comprising an outer screw (1) and an outer thread (22) arranged at the bottom of the outer screw (1), characterized in that: The outer screw (1) is respectively provided with a first washer (2) and a second washer (7), and the bottom of the outer screw (1) is provided with a screw cover (9), the inner wall of the screw cover (9) is provided with a first inner screw groove (13) adapted to be screwed with the outer screw thread (22), the top of the screw cover (9) is movably connected with a connecting ring (8), and the inner wall of the connecting ring (8) is provided with two symmetrical positioning grooves (19), and the middle position of the bottom of the outer screw (1) is provided with a second inner screw groove (30 ), and a docking hole (33) is provided at the top of the second inner screw groove (30), an inner screw rod (16) is fixed at the middle position of the inner wall of the bottom of the screw cover (9) and is inserted into the second inner screw groove (30) and the docking hole (33), and an inner screw thread (17) is provided on the outer wall of the inner screw rod (16) and is screwed to the second inner screw groove (30), a through hole (23) is provided at the middle position of the inner screw rod (16) and the middle position of the bottom of the screw cover (9), and the through hole (23) is fixed ... A push-pull rod (15) is inserted inside, and a push-pull frame (11) is fixed to one end of the push-pull rod (15). A cavity (34) is opened at the end of the inner screw (16) that contacts the screw cover (9), and an annular ring (35) inserted in the cavity (34) is fixed to the outer wall of the push-pull rod (15). A spring (31) sleeved on the outer wall of the push-pull rod (15) is fixed on one side of the annular ring (35) and the inner wall of the cavity (34). The inner wall of the through hole (23) is in contact with the inner screw ( The outer wall of the outer screw (16) is provided with two symmetrical first through grooves (24), and the inner wall of the docking hole (33) and the outer wall of the outer screw (1) are provided with second through grooves (28) distributed at equal distances, the inner walls of the first through grooves (24) are connected to the positioning key rod (20) by a pin shaft, the bottom end of the positioning key rod (20) is provided with tooth grooves (36) distributed at equal distances, and the other end of the push-pull rod (15) is fixed with a double-sided rack (32) meshing with the tooth groove (36).

2. A high-strength bolt connection pair according to claim 1, characterized in that: The inner diameters of the connecting ring (8), the first washer (2), and the second washer (7) are all larger than the outer diameter of the external thread (22), and the outer wall of the connecting ring (8) is provided with wrench slots (12) distributed in an annular manner at equal distances.

3. A high-strength bolt connection pair according to claim 2, characterized in that: One end of the positioning key rod (20) extends out of the second through slot (28) and is then clamped onto one end of the inner wall of the positioning slot (19). The width of the positioning key rod (20) is the same as that of the first through slot (24). One inner wall of the positioning slot (19) is designed to be an arc surface.

4. A high-strength bolt connection pair according to claim 3, characterized in that: The inner screw (16) is composed of a rod body (1601) and a joint (1602), and a matching groove (29) is provided at the middle position of the bottom of the outer screw (1). The outer wall of the joint (1602) is adapted to the inner wall of the matching groove (29), and the side surface of the joint (1602) and the inner wall of the matching groove (29) are both designed to be inclined.

5. A high-strength bolt connection pair according to claim 4, characterized in that: The length of the first internal screw groove (13) is greater than the length of the external screw thread (22), and the length of the second internal screw groove (30) is greater than the length of the internal screw thread (17).

6. A high-strength bolt connection pair according to claim 5, characterized in that: A plurality of connection holes (25) are provided at the bottom of the screw cover (9), and magnetic blocks (14) are fixedly provided on the inner walls of the connection holes (25), and the magnetic blocks (14) are fixedly attached to the push-pull frame (11).

7. A high-strength bolt connection pair according to claim 6, characterized in that: A hexagonal screw ring (10) is fixed to the outer wall of the screw cover (9), and a ring-shaped limiting groove (26) is provided at the bottom of the connecting ring (8). A limiting ring (18) is fixed to the top of the screw cover (9) and is clamped in the limiting groove (26). The cross-sections of the limiting ring (18) and the limiting groove (26) are both designed to be T-shaped.

8. A high-strength bolt connection pair according to claim 7, characterized in that: The top of the connecting ring (8) is provided with mounting grooves (27) distributed at equal distances, and the inner walls of the mounting grooves (27) are rotatably connected to rolling balls (21), the bottoms of the rolling balls (21) are attached to the bottoms of the mounting grooves (27), and the second gasket (7) is placed on the rolling balls (21).

9. The high-strength bolt connection pair according to claim 1, characterized in that: A supporting head (3) is fixed to the top end of the outer screw (1), and a hexagonal nut (4) is fixed to the top of the supporting head (3).

10. The high-strength bolt connection pair according to claim 9, characterized in that: A hexagonal inner groove (5) is provided at the middle position of the top of the hexagonal nut (4), and a flat opening (6) is provided at the middle position of the hexagonal inner groove (5).

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