Double nut restraining bolt structure

Abstract

The application discloses a double-nut restraining bolt structure, a sliding rod section of a rotating column is arranged in a containing space formed by a limiting ring and a screw sleeve in a central hole of the screw sleeve, and the screw rod section penetrates through the limiting ring on the corresponding side and extends to the outside of the screw sleeve. Anti-rotation members are respectively arranged on the screw rod sections of the corresponding rotating columns, and sliding parts on the two sides are embedded in sliding grooves of the screw sleeve; flexible anti-loosening sleeves are arranged outside the threaded rod sections of the corresponding rotating columns. First nuts are arranged on end portions of the corresponding screw sleeves. The rotating column is rotated to drive the anti-rotation members and the flexible anti-loosening sleeves to move linearly along the sliding grooves towards through holes of the first nuts, so that the outer ends of the sliding parts are inserted into embedding grooves of the first nuts, and then relative rotation between the first nuts and the screw sleeves can be prevented; second nuts are screwed into the through holes of the corresponding first nuts and extrude the flexible anti-loosening sleeves, so that the flexible anti-loosening sleeves are tightly attached to the corresponding screw rod sections, and the anti-loosening effect is improved.

Description

Technical Field

[0001] This invention relates to a double-nut constrained bolt structure, belonging to the field of fastener technology. Background Technology

[0002] Bolted connections are commonly used in daily life for connection and fixation. However, existing bolted structures can loosen on their own due to vibration or other reasons during use. To improve structural stability and prevent accidents caused by loose bolts, existing bolted connections mainly use a double nut + washer configuration to prevent loosening, but the effect is not very satisfactory. Summary of the Invention

[0003] The purpose of this invention is to provide a double-nut constrained bolt structure that can effectively lock the fastened parts and has excellent anti-loosening effect.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A double-nut constrained bolt structure, comprising:

[0006] The threaded sleeve has a central hole and is set in the corresponding mounting holes on two fasteners and extends to the outside of the fasteners at both ends; two limiting rings are provided in the central hole, and corresponding sliding grooves are provided on the inner wall of the threaded sleeve located outside the two limiting rings.

[0007] Two rotating columns are respectively rotatably installed in the central hole of the threaded sleeve, and each has a screw section and a sliding section; the sliding sections of the two rotating columns are located in the accommodating space formed by the limiting ring and the threaded sleeve and their tail ends abut against each other; the screw section passes through the limiting ring on the corresponding side and extends to the outside of the threaded sleeve.

[0008] Two anti-rotation components are respectively screwed onto the screw section of the corresponding side rotating column and have sliding parts on both sides that are embedded in the sliding groove and extend to the end of the screw sleeve;

[0009] Two flexible anti-loosening sleeves, with a convex-shaped structure, are respectively fitted onto the threaded rod section of the corresponding side rotation column, and the large-diameter section of the flexible anti-loosening sleeve is embedded in the anti-rotation component;

[0010] Two first nuts, with an U-shaped structure facing the fastener, are screwed onto the ends of corresponding side sleeves to lock the two fasteners; the outer top has a through hole through which the screw section of the rotating column and the small diameter section of the flexible anti-loosening sleeve pass, and the diameter of the through hole is smaller than the diameter of the large diameter section of the flexible anti-loosening sleeve; and multiple grooves that communicate with the through hole and correspond to the sliding groove are opened on the inner side of the outer top.

[0011] Two second nuts are used to rotate the rotating column to drive the anti-rotation component and the flexible anti-loosening sleeve to move linearly along the sliding groove toward the through hole. The outer end of the sliding part is inserted into the groove on the inner side of the outer top of the first nut, and the flexible anti-loosening sleeve abuts against the inner side of the outer top of the first nut. The second nuts are respectively sleeved on the corresponding side screw section and the flexible anti-loosening sleeve, and the threads are screwed into the through hole of the corresponding side first nut and squeeze the flexible anti-loosening sleeve so that the flexible anti-loosening sleeve and the corresponding screw section are tightly fitted.

[0012] Preferably, washers are also fitted on both ends of the threaded sleeve. After the first nut is screwed to the end of the threaded sleeve, it squeezes the washers so that the washers abut against the fasteners.

[0013] Preferably, an annular groove is formed inward on the outer surface of the large-diameter section of the flexible anti-loosening sleeve; after the second nut is screwed onto the first nut, the end of the second nut is embedded in the groove and squeezes the flexible anti-loosening sleeve so that the flexible anti-loosening sleeve fits tightly against the inner wall of the corresponding side threaded sleeve.

[0014] Preferably, the threaded sleeve located outside the limiting ring has internal threads.

[0015] Preferably, one of the rotating cylinders has a central threaded hole, and the inner end of the other rotating cylinder has an end threaded hole corresponding to the central threaded hole; a connecting screw is screwed into the central threaded hole and the end threaded hole;

[0016] Furthermore, the two rotating columns drive the corresponding anti-rotation components to move linearly along the slide groove toward the corresponding side through hole in opposite directions.

[0017] Preferably, a rubber sleeve is provided on the outer sleeve of the connecting screw.

[0018] Preferably, a swivel-aiding groove is provided at the end of the connecting screw.

[0019] Preferably, the length of the connecting screw is less than the length of the central threaded hole but greater than the length of the end threaded hole.

[0020] Preferably, the flexible anti-loosening sleeve is made of rubber.

[0021] Preferably, the tightening direction of the second nut is opposite to the rotation direction of the corresponding side rotating column, which drives the anti-rotation component to move linearly along the slide groove toward the through hole, and also to the tightening direction of the first nut.

[0022] The beneficial effects of this invention are as follows:

[0023] The rotating column drives the anti-rotation sleeve to embed into the first nut, forming an integral structure between the first nut and the sleeve, effectively preventing relative rotation between them. Simultaneously, the first and second nuts are threaded together, and the second nut compresses the flexible anti-loosening sleeve, ensuring a certain degree of connection between the two nuts and preventing the rotating column from rotating due to vibration, thus improving the anti-loosening effect. Furthermore, unlike conventional bolt structures, the bolt structure provided by this invention prevents removal of the bolt structure by rotating the first nut after the second nut is disassembled, thus enhancing the anti-theft effect.

[0024] Two rotating posts are connected as one unit by a connecting screw. The two rotating posts drive their corresponding anti-rotation components to move linearly along the slide groove toward the corresponding side through hole in opposite directions. That is, after assembly, if the connecting screw is not removed first, the sliding part of the anti-rotation component cannot be removed from the groove by rotating the rotating post. This structure allows the center threaded hole to be set inside the fastener or the equipment. Without entering the inside of the fastener or the equipment, the connecting screw cannot be removed, and thus the entire bolt structure (except for the second nut on the outside) cannot be disassembled, further improving the anti-theft effect. Attached Figure Description

[0025] Figure 1 This is a cross-sectional view of the bolt structure from one perspective.

[0026] Figure 2 Another sectional view of the bolt structure;

[0027] Figure 3 Top view to prevent rotation.

[0028] The meanings of the main reference numerals in the figure are as follows:

[0029] 1. Screw sleeve, 2. Rotating column, 3. Anti-rotation component, 4. Flexible anti-loosening sleeve, 5. First nut, 6. Second nut, 7. Limiting ring, 8. Sliding groove, 9. Screw section, 10. Sliding rod section, 11. Sliding part, 12. Washer, 13. Embedded groove, 14. Countersunk groove, 15. Connecting screw. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] This embodiment provides a double-nut constrained bolt structure, see [link]. Figure 1-3 As shown, it includes a screw sleeve 1, two rotating columns 2, two anti-rotation components 3, two flexible anti-loosening sleeves 4 (rubber or other flexible materials with corrosion resistance and high temperature resistance are acceptable), two first nuts 5, and two second nuts 6.

[0032] The threaded sleeve 1 has a central hole and is disposed in the corresponding mounting holes on the two fasteners and extends to the outside of the fasteners at both ends; two limiting rings 7 are disposed in the central hole, and corresponding sliding grooves 8 are provided on the inner wall of the threaded sleeve 1 located outside the two limiting rings 7; two rotating columns 2 are respectively rotatably disposed in the central hole of the threaded sleeve 1, and each has a screw section 9 and a sliding rod section 10; the sliding rod sections 10 of the two rotating columns 2 are both located in the accommodating space formed by the limiting rings 7 and the threaded sleeve 1 and their tail ends abut against each other, and the screw section 9 passes through the limiting rings 7 on the corresponding side and extends to the outside of the threaded sleeve 1.

[0033] Two anti-rotation components 3 are respectively screwed onto the screw section 9 of the corresponding side rotating column 2 and have sliding parts 11 that are embedded in the sliding groove 8 and extend to the end of the screw sleeve 1 on both sides; two flexible anti-loosening sleeves 4 have a convex structure and are respectively sleeved on the threaded rod section of the corresponding side rotating column 2, and the large diameter section of the flexible anti-loosening sleeve 4 is embedded in the anti-rotation component 3.

[0034] Two first nuts 5 have a U-shaped structure with their openings facing the fasteners and are screwed onto the ends of corresponding side sleeves 1 to lock the two fasteners. Washers 12 are also fitted on both ends of the sleeves 1. After the first nuts 5 are screwed to the ends of the sleeves 1, they press the washers 12 to make them abut against the fasteners. The outer top of the first nut 5 has a through hole through which the screw section 9 of the rotating column 2 and the small diameter section of the flexible anti-loosening sleeve 4 pass, and the diameter of the through hole is smaller than the diameter of the large diameter section of the flexible anti-loosening sleeve 4. Multiple grooves 13 that communicate with the through holes and correspond to the sliding grooves 8 are opened on the inner side of the outer top.

[0035] Rotating the rotating column 2 causes the anti-rotation component 3 and the flexible anti-loosening sleeve 4 to move linearly along the sliding groove 8 toward the through hole. The outer end of the sliding part 11 is inserted into the groove 13 on the inner side of the outer top of the first nut 5, and the flexible anti-loosening sleeve 4 abuts against the inner side of the outer top of the first nut 5. The two second nuts 6 are respectively sleeved on the corresponding side screw section 9 and the flexible anti-loosening sleeve 4, and their threads are screwed into the through hole of the corresponding side first nut 5, pressing the flexible anti-loosening sleeve 4 so that the flexible anti-loosening sleeve 4 is tightly fitted with the corresponding screw section 9. Furthermore, an annular groove 14 is formed inward on the outer surface of the large diameter section of the flexible anti-loosening sleeve 4. After the second nut 6 is screwed onto the first nut 5, the end of the second nut 6 is embedded in the groove 14 and presses the flexible anti-loosening sleeve 4 so that the flexible anti-loosening sleeve 4 is tightly fitted with the inner wall of the corresponding side screw sleeve 1. At the same time, the screw sleeve 1 located outside the limiting ring 7 has internal threads to increase the fitting effect between the flexible anti-loosening sleeve 4 and the inner wall of the screw sleeve 1, thereby improving the anti-loosening effect.

[0036] The aforementioned structure, through the rotating post 2 driving the anti-rotation sleeve to embed into the first nut 5, makes the first nut 5 and the threaded sleeve 1 form an integral structure, thereby effectively preventing relative rotation between the first nut 5 and the threaded sleeve 1. Simultaneously, the first nut 5 is threadedly connected to the second nut 6, and the second nut 6 compresses the flexible anti-loosening sleeve 4, which to a certain extent ensures the connection between the two nuts and prevents the rotating post 2 from rotating due to vibration, thus improving the anti-loosening effect. Furthermore, unlike conventional bolt structures, the bolt structure provided by this invention, after the second nut 6 is disassembled, cannot be removed by rotating the first nut 5 without knowing the bolt structure, thus improving the anti-theft effect.

[0037] To enhance anti-theft performance, a central threaded hole is provided on one of the rotating posts 2, and an end threaded hole corresponding to the central threaded hole is provided on the inner end of the other rotating post 2. A connecting screw 15 is screwed into both the central and end threaded holes. To prevent the connecting screw 15 from loosening, a rubber sleeve is fitted over the connecting screw 15, and an auxiliary groove (cross or star groove) is provided at the end of the connecting screw 15 to facilitate screwing it in or out. The length of the connecting screw 15 is less than the length of the central threaded hole but greater than the length of the end threaded hole to ensure effective connection between the two rotating posts 2.

[0038] At the same time, the two rotating columns 2 drive the corresponding anti-rotation parts 3 to move linearly along the slide groove 8 toward the corresponding side through hole in the opposite direction of rotation. The tightening direction of the second nut 6 is also opposite to the rotation direction of the corresponding side rotating column 2 driving the anti-rotation parts 3 to move linearly along the slide groove 8 toward the through hole and the tightening direction of the first nut 5.

[0039] The above structure connects two rotating posts 2 into one unit via connecting screw 15. The two rotating posts 2 drive their corresponding anti-rotation components 3 to move linearly along the sliding groove 8 towards their respective side through holes in opposite directions of rotation (note that this opposite rotation direction is based on the top view of one of the rotating posts 2; after the two rotating posts 2 are connected by connecting screw 15, rotating one of the rotating posts 2 causes the two anti-rotation components 3 to shift towards opposite sides, thus ensuring that the sliding part 11 of one of the anti-rotation components 3 remains in the groove 13). In other words, after assembly, if the connecting screw 15 is not removed first, rotating the rotating post 2 will not allow the sliding part 11 of the anti-rotation component 3 to be removed from the groove 13. This structure allows the central threaded hole to be located inside the fastener or the equipment. Without accessing the inside of the fastener or the equipment, the connecting screw 15 cannot be removed, and the entire bolt structure (except for the outer second nut 6) cannot be disassembled, further improving the anti-theft effect.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A double-nut constrained bolt structure, characterized in that, include: The threaded sleeve has a central hole and is set in the corresponding mounting holes on two fasteners and extends to the outside of the fasteners at both ends; two limiting rings are provided in the central hole, and corresponding sliding grooves are provided on the inner wall of the threaded sleeve located outside the two limiting rings. Two rotating columns are respectively rotatably installed in the central hole of the threaded sleeve, and each has a screw section and a sliding section; the sliding sections of the two rotating columns are located in the accommodating space formed by the limiting ring and the threaded sleeve and their tail ends abut against each other; the screw section passes through the limiting ring on the corresponding side and extends to the outside of the threaded sleeve. Two anti-rotation components are respectively screwed onto the screw section of the corresponding side rotating column and have sliding parts on both sides that are embedded in the sliding groove and extend to the end of the screw sleeve; Two flexible anti-loosening sleeves, with a convex-shaped structure, are respectively fitted onto the screw section of the corresponding side rotating column, and the large-diameter section of the flexible anti-loosening sleeve is embedded in the anti-rotation component; Two first nuts, with an U-shaped structure facing the fastener, are screwed onto the ends of corresponding side sleeves to lock the two fasteners; the outer top has a through hole through which the screw section of the rotating column and the small diameter section of the flexible anti-loosening sleeve pass, and the diameter of the through hole is smaller than the diameter of the large diameter section of the flexible anti-loosening sleeve; and multiple grooves that communicate with the through hole and correspond to the sliding groove are opened on the inner side of the outer top. Two second nuts are used to rotate the rotating column to drive the anti-rotation component and the flexible anti-loosening sleeve to move linearly along the sliding groove toward the through hole. The outer end of the sliding part is inserted into the groove on the inner side of the outer top of the first nut, and the flexible anti-loosening sleeve abuts against the inner side of the outer top of the first nut. The second nuts are respectively sleeved on the corresponding screw section and the flexible anti-loosening sleeve, and the threads are screwed into the through hole of the corresponding first nut and squeeze the flexible anti-loosening sleeve so that the flexible anti-loosening sleeve and the corresponding screw section are tightly fitted.

2. The double-nut constrained bolt structure according to claim 1, characterized in that, Washers are fitted on both ends of the threaded sleeve. After the first nut is screwed to the end of the threaded sleeve, it squeezes the washers so that the washers abut against the fasteners.

3. The double-nut constrained bolt structure according to claim 1, characterized in that, An annular groove is formed on the outer side of the large-diameter section of the flexible anti-loosening sleeve. After the second nut is screwed onto the first nut, the end of the second nut is embedded in the groove and squeezes the flexible anti-loosening sleeve so that the flexible anti-loosening sleeve fits tightly against the inner wall of the corresponding side threaded sleeve.

4. The double-nut constrained bolt structure according to claim 3, characterized in that, The threaded sleeve located outside the limiting ring has internal threads.

5. The double-nut constrained bolt structure according to claim 1, characterized in that, One of the rotating cylinders has a central threaded hole, and the inner end of the other rotating cylinder has an end threaded hole corresponding to the central threaded hole; a connecting screw is screwed into the central threaded hole and the end threaded hole; Furthermore, the two rotating columns drive the corresponding anti-rotation components to move linearly along the slide groove toward the corresponding side through hole in opposite directions.

6. The double-nut constrained bolt structure according to claim 5, characterized in that, A rubber sleeve is provided on the outer sleeve of the connecting screw.

7. The double-nut constrained bolt structure according to claim 5, characterized in that, A swivel groove is provided at the end of the connecting screw.

8. A double-nut constrained bolt structure according to claim 5, characterized in that, The length of the connecting screw is less than the length of the central threaded hole, but greater than the length of the end threaded hole.

9. The double-nut constrained bolt structure according to claim 1, characterized in that, The flexible anti-loosening sleeve is made of rubber.

10. A double-nut constrained bolt structure according to claim 5, characterized in that, The tightening direction of the second nut is opposite to the rotation direction of the anti-rotation component that is driven to move linearly along the slide groove toward the through hole by the rotation of the corresponding side column, and also to the tightening direction of the first nut.

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