Anti-loosening and anti-theft nut assembly, bolt assembly and gasket special for railway steel rail

Abstract

The utility model relates to an anti-loosening and anti-theft nut assembly, bolt assembly and gasket special for a railway steel rail, the bolt assembly and gasket comprise a gasket and a nut, and a clamping bulge is arranged on the lower surface of the gasket; clamping teeth are arranged on the upper surface of the gasket; a plurality of tooth grooves are directly formed in the end face of one end of the nut, and the structures of the tooth grooves are matched with the structures of the clamping teeth. Another anti-loosening and anti-theft bolt assembly comprises a gasket and a bolt, a plurality of tooth grooves are directly formed in the end face of the inner side of a nut on the bolt, and the structures of the tooth grooves are matched with the structures of the clamping teeth. The spring clamp has the advantages that the special structure of the spring clamp is utilized, the clamping protrusion is arranged on the lower surface of the gasket, the clamping teeth are arranged on the upper surface of the gasket, and the clamping protrusion is inserted into the center bent hole of the spring clamp, so that the gasket cannot rotate; meanwhile, the tooth grooves are formed in the end face of one end of the nut, and after the tooth grooves and the clamping teeth are mutually embedded, the nut cannot be loosened; the tooth grooves are formed in the nut of the bolt, and after the tooth grooves and the clamping teeth are mutually embedded, the bolt cannot be loosened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of anti-loose fastener, in particular to a special anti-loose and anti-theft nut assembly for railway rail, bolt assembly and gasket. BACKGROUND

[0002] Common fastening assemblies include bolt-nut assembly, stud-nut assembly, screw, stud, etc., wherein the nut is a polygonal column with a central threaded hole, and an inner ring wall of the central threaded hole is provided with internal threads, which are matched with external threads on the stud to be screwed, the stud is a screw rod with a bolt head, and the screw rod is provided with external threads for fastening and connecting two or more fastened members with through holes.

[0003] After the nut is screwed on the screw rod, the fastening of the nut and the bolt is generally stable. However, if the fastened member is in vibration for a long time, the vibration frequency difference between the connecting members will exist, so that the connecting members in the connecting structure will have a reverse unscrewing tendency, which will cause the connection between the nut and the stud to become loose, and even fall off.

[0004] In particular, the fastener used on the rail needs to ensure that the nut is not easy to loosen. The existing rail fastening device places the rail on the sleeper, fixes and installs the screw rod on the sleeper on both sides of the lower wing of the rail, then installs the track gauge baffle on the screw rod, and then installs the butterfly spring clamp on the track gauge baffle, clamps the center bend hole of the butterfly spring clamp on the screw rod, and then installs the gasket and the nut. Once the nut of this structure is loose or even falls off, it will bring great safety hazards. Although various anti-loose nuts are used, the effect is not ideal, and a large number of manual inspections and repairs are still required. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a nut assembly developed according to the special structure of the railway rail, which can be self-clamped and anti-loose, and can prevent theft, and can greatly reduce manual inspection and repair.

[0006] To solve the above technical problems, the technical solution adopted by the present application is a special anti-loose and anti-theft nut assembly for railway rail, bolt assembly and gasket, which comprises a gasket and a nut, the lower surface of the gasket is provided with a clamping protrusion, the upper surface of the gasket is provided with a clamping tooth, and the end face of one end of the nut is directly provided with a plurality of tooth grooves, the structure of the tooth grooves is matched with the structure of the clamping tooth, so that the clamping tooth and the tooth groove can be stably fitted and inserted into each other, so that the gasket can be clamped in the center bend hole of the butterfly spring clamp on the rail and cannot move, and thus the nut cannot be loosened.

[0007] A railway rail special anti-loose anti-theft bolt assembly, comprising a gasket and a bolt, the lower surface of the gasket is provided with a clamping convex; the upper surface of the gasket is provided with a clamping tooth; the inner side end face of the nut on the bolt is directly provided with a plurality of tooth grooves, the structure of the tooth groove is matched with the structure of the clamping tooth, so that the clamping tooth and the tooth groove can be stably fitted and inserted, so that the gasket can be clamped in the center bending hole of the butterfly type spring clamp on the track and cannot move, and then the bolt cannot be loosened; such bolt assembly can not only be used on railway rails, but also can be used in all cases where only bolt fastening is required.

[0008] A railway rail special anti-loose anti-theft gasket, the lower surface of the gasket is provided with a clamping convex, which is used to insert into the center hole groove of the butterfly spring clamp, so that the gasket cannot rotate left and right, the clamping convex can be one or two; when two are set, the two clamping convexes are centrally symmetric with the center of the circular hole of the gasket.

[0009] The upper surface of the gasket is provided with a clamping tooth, the surface of the clamping tooth includes an inclined tooth surface and a vertical tooth surface directly connected, the vertical tooth surface is perpendicular to the upper surface of the gasket, and the inclined tooth surface is inclined to the upper surface of the gasket, the inclined direction of the inclined tooth surface is opposite to the tightening direction of the inner thread of the nut, that is, the extension supporting direction of the clamping tooth is opposite to the loosening direction of the inner thread of the nut, so that the nut can only be tightened and cannot be loosened; in the initial state without elastic pressure, the inclination angle of the inclined tooth surface relative to the upper surface of the gasket is greater than 0° and less than 45°, preferably 1°-30°, and most preferably 5°, that is, the included angle between the inclined tooth surface and the upper surface of the gasket is preferably 1°-30°; the clamping tooth can be an elastic clamping tooth or a non-elastic clamping tooth, the elastic clamping tooth is a elastic clamping tooth which is bent upward after being cut for a section, the non-elastic clamping tooth is directly generated or welded on the upper surface of the gasket; the clamping tooth can be one or several, when several are set, the clamping teeth are evenly distributed on the upper surface of the gasket in a radial manner.

[0010] A railway rail special anti-loose anti-theft nut, one end of the nut is directly provided with a plurality of tooth grooves, the structure of the tooth groove matches the structure of the clamping tooth, so that the clamping tooth can be stably inserted into the tooth groove; the number of the plurality of tooth grooves is an integer multiple of the number of clamping teeth on the gasket, the plurality of tooth grooves are evenly distributed on the nut end face in a radial manner, the groove wall of the tooth groove includes a vertical groove wall and an inclined groove wall connected directly, the vertical groove wall is perpendicular to the nut end face, the inclined groove wall is inclined to the nut end face, the inclined direction of the inclined groove wall is the same as the tightening direction of the internal thread of the nut, the inclination angle of the inclined groove wall is the same as the inclination angle of the inclined tooth surface of the clamping tooth on the gasket, which is greater than 0° and less than 45°, preferably 1°-30°, and most preferably 5°, that is, the included angle between the inclined groove wall and the nut end face is preferably 1°-30°; when the nut is screwed close to the gasket, the inclined groove wall of the tooth groove on the nut will gradually compress the elastic clamping tooth on the gasket, and when the transition to the vertical groove wall is made, the elastic clamping tooth will be restored, so that the elastic clamping tooth supports the vertical groove wall, so that the nut can only be tightened and cannot be loosened.

[0011] A railway rail special anti-loose anti-theft bolt, the inner side of the nut on the bolt is directly provided with a plurality of tooth grooves, the structure of the tooth groove matches the structure of the clamping tooth, so that the clamping tooth can be stably inserted into the tooth groove; the number of the plurality of tooth grooves is an integer multiple of the number of clamping teeth on the gasket, the plurality of tooth grooves are evenly distributed on the inner side of the nut in a radial manner, the groove wall of the tooth groove includes a vertical groove wall and an inclined groove wall connected directly, the vertical groove wall is perpendicular to the inner side of the nut, the inclined groove wall is inclined to the inner side of the nut, the inclined direction of the inclined groove wall is the same as the tightening direction of the external thread of the screw rod on the bolt, the inclination angle of the inclined groove wall is the same as the inclination angle of the inclined tooth surface of the clamping tooth on the gasket, which is greater than 0° and less than 45°, preferably 1°-30°, and most preferably 5°, that is, the included angle between the inclined groove wall and the inner side of the nut is preferably 1°-30°; when the bolt is screwed and the nut is close to the gasket, the inclined groove wall of the tooth groove on the nut will gradually compress the elastic clamping tooth on the gasket, and when the transition to the vertical groove wall is made, the elastic clamping tooth will be restored, so that the elastic clamping tooth supports the vertical groove wall, so that the bolt can only be tightened and cannot be loosened.

[0012] When the nut in the nut assembly is combined with the gasket, or the bolt in the bolt assembly is combined with the gasket, the structure of the tooth groove matches the structure of the clamping tooth, so that the clamping tooth and the tooth groove are stably embedded with each other; the number of the tooth grooves on the nut or the nut cap is an integer multiple of the number of the clamping teeth on the gasket, and the tooth grooves are evenly distributed on the end surface of the nut or the nut cap in a radial manner; the inclination angle of the inclined groove wall of the tooth groove is the same as the inclination angle of the inclined tooth surface of the clamping tooth on the gasket, and when the nut or the nut cap is screwed close to the gasket, the inclined groove wall of the tooth groove on the nut or the nut cap will gradually press the elastic clamping tooth on the gasket, and when the transition to the vertical groove wall is made, the elastic clamping tooth is restored, so that the elastic clamping tooth supports the vertical groove wall, so that the nut or the bolt can only be tightened, but cannot be loosened.

[0013] After the nut with the tooth groove structure of the vertical groove wall is installed on the steel rail, the nut can only be tightened, but cannot be loosened, which can achieve the effects of anti-loosening and anti-theft, but cannot be removed for maintenance. In order to be removed for maintenance, the vertical tooth surface on the gasket and / or the vertical groove wall on the nut can be slightly inclined, so that the nut can be loosened and removed under a relatively large torque. That is, the vertical tooth surface of the clamping tooth on the gasket is inclined to the loosening direction of the nut by 1°-15°, preferably 5°, and / or the vertical groove wall on the nut is inclined to the loosening direction of the nut by 1°-15°, preferably 5°.

[0014] When the nut assembly is installed and used, a screw rod is fixedly installed on a concrete sleeper on a railway. First, a special butterfly-shaped spring clamp on the steel rail is clamped on the screw rod, then the gasket is passed through the screw rod and the clamping protrusions on the gasket are inserted into the center curved hole of the butterfly-shaped spring clamp, and then the nut is screwed into the screw rod and the tooth groove on the nut is tightly pressed against the clamping tooth on the gasket, so that the tooth groove and the clamping tooth are stably embedded with each other. In this way, the gasket clamped in the center curved hole of the butterfly-shaped spring clamp cannot be loosened, and the nut also cannot be loosened.

[0015] When the bolt assembly is installed and used, a pre-buried sleeve is fixedly installed on a concrete sleeper on a railway. First, a gauge baffle is clamped on the sleeper, then a butterfly-shaped spring clamp is pressed between the gauge baffle and the rail bottom, then the gasket is placed on the butterfly-shaped spring clamp and the clamping protrusions on the gasket are inserted into the center curved hole of the butterfly-shaped spring clamp, then the bolt is passed through the gasket hole, the center curved hole of the butterfly-shaped spring clamp, and the through hole on the gauge baffle, and then the bolt is screwed into the pre-buried sleeve on the sleeper and tightened, and the tooth groove on the inner side surface of the nut cap on the bolt is embedded with the clamping tooth on the upper surface of the gasket. In this way, the gasket clamped in the center curved hole of the butterfly-shaped spring clamp cannot be loosened, and the bolt also cannot be loosened.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] (1) The special structure of the spring clip is utilized. A locking protrusion is set on the lower surface of the washer and a locking tooth is set on the upper surface. The locking protrusion is inserted into the central curved hole of the spring clip, which can prevent the washer from rotating.

[0018] (2) A toothed groove is provided on one end face of the nut. After the toothed groove and the retaining tooth interlock, the nut cannot be loosened.

[0019] (3) A toothed groove is provided on the nut of the bolt. After the toothed groove and the retaining tooth interlock, the bolt cannot be loosened. Attached Figure Description

[0020] Figure 1 A schematic diagram of the installation structure for an existing nut-fastening rail fastener system.

[0021] Figure 2 A schematic diagram of the installation structure for an existing bolt-fastened rail fastener system.

[0022] Figure 3 This is a schematic diagram of the gasket structure in Example 1.

[0023] Figure 4 This is a schematic diagram of the nut structure in Example 2.

[0024] Figure 5 This is a schematic diagram of the bolt structure in Example 3.

[0025] Figure 6 This is a schematic diagram of the disassembly and assembly fastening structure of the railway rail special anti-loosening and anti-theft nut assembly, bolt assembly, washer and spring clip in Example 4.

[0026] Figure 7 This is a schematic diagram of the disassembly and assembly fastening structure between the railway rail anti-loosening and anti-theft bolt assembly and the spring clip in Example 5.

[0027] In the diagram: 1. Sleeper, 2. Screw, 3. Elastic pad, 4. Steel pad, 5. Rail, 6. Rail base, 7. Gauge baffle, 8. Spring clip, 9. Center bend, 10. Washer, 11. Nut, 12. Embedded threaded tube, 13. Bolt, 14. Nut, 15. Engraving, 16. Gear, 161. Inclined tooth surface, 162. Vertical tooth surface, 17. Tooth groove, 171. Inclined groove wall, 172. Vertical groove wall. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments. The following embodiments are intended to illustrate the present invention and not to further limit the present invention, and should not be used to limit the scope of protection of the present invention.

[0029] like Figure 1 As shown, the existing track fastening system installation structure is basically of two types: one is the nut-tightening type, such as...Figure 1 As shown, two screw rods 2 are pre-fixed on the upper sides of the concrete sleeper 1. During installation, an elastic pad 3 and a steel pad 4 are laid on the sleeper between the two screw rods. Then, the rail 5 is placed on the steel pad 4. Then, a gauge baffle 7 is installed on each side of the rail base 6 of the rail 5. The through hole on the gauge baffle 7 is passed through the screw rod 2. Then, a butterfly spring clip 8 is installed on the gauge baffle 7. The center bend 9 of the butterfly spring clip 8 is clamped on the screw rod 2. Then, a washer 10 and a nut 11 are installed. In actual application, this installation structure should be designed so that the nut can easily loosen due to the vibration generated when the train passes by.

[0030] Another type is bolt-fastened, such as Figure 2 As shown, two pre-embedded threaded tubes 12 are pre-fixed on the upper sides of the concrete sleeper 1. During installation, an elastic pad 3 and a steel pad 4 are laid on the sleeper 1 between the two pre-embedded threaded tubes 12. Then, the rail 5 is placed on the steel pad 4. Then, a gauge baffle 7 is installed on each side of the rail base 6 of the rail 5. Then, a butterfly spring clip 8 is installed on the gauge baffle 7. The washer 10 is placed on the butterfly spring clip 8. Then, the bolt 13 is passed through the washer 10, then through the central bend 9 of the butterfly spring clip 8, and then through the through hole on the gauge baffle 7. Then, the screw 2 on the bolt 13 is screwed into the pre-embedded threaded tube 12 in the sleeper 1. This installation structure is also prone to bolt 13 loosening. Once it loosens or even falls off, it will bring great safety hazards. Therefore, at present, a lot of manual inspection and repair are still used.

[0031] Therefore, this solution develops a dedicated anti-loosening and anti-theft fastening component based on the unique installation structure of the track; its implementation method is as follows: Example

[0032] like Figure 3 As shown, a special anti-loosening and anti-theft shim for railway rails is manufactured. The lower surface of the shim 10 is provided with a locking protrusion 15, which is used to insert into the central hole groove 9 of the butterfly spring clip 8 so that the shim 10 cannot rotate left or right. The locking protrusion 15 can be provided one or two. When two are provided, the two locking protrusions 10 are centrally symmetrical about the center of the circular hole of the shim 10.

[0033] The upper surface of the washer 10 is provided with retaining teeth 16. The surface of the retaining teeth 16 includes an inclined tooth surface 161 and a vertical tooth surface 162 that are directly connected by a bend. The vertical tooth surface 162 is perpendicular to the upper surface of the washer 10, and the inclined tooth surface 161 is inclined to the upper surface of the washer 10. The inclination direction of the inclined tooth surface 161 is opposite to the tightening direction of the internal thread of the nut 11. That is, the protruding and supporting direction of the retaining teeth 10 abuts against the loosening direction of the internal thread of the nut 11, so that the nut 11 can only be tightened and cannot be loosened. In the initial state without spring pressure, the retaining teeth 16 are generally used to tighten the nut 11. The inclined angle of the inclined tooth surface 161 relative to the upper surface of the gasket 10 is greater than 1° and less than 30°. In this embodiment, it is made to be 5°. The locking tooth 10 can be an elastic locking tooth or a non-elastic locking tooth. The elastic locking tooth is formed by cutting a section of the gasket 10 and bending it upward to form an elastic locking tooth that can be compressed back after being extended. The non-elastic locking tooth is directly generated or welded to the upper surface of the gasket 10. There can be one locking tooth 10 or several locking teeth. When several locking teeth are provided, the locking teeth 10 are radially and evenly distributed on the upper surface of the gasket. Example

[0034] like Figure 4 As shown, a special anti-loosening and anti-theft nut for railway rails is manufactured. Several grooves 17 are directly formed on one end face of the nut 11. The structure of the grooves 17 matches the structure of the retaining teeth 16, allowing the retaining teeth 16 to be stably embedded in the grooves 17. The number of grooves 17 is an integer multiple of the number of retaining teeth 16 on the washer 10. The grooves 17 are radially and evenly distributed on the end face of the nut 11. The groove walls of the grooves 17 include inclined groove walls 171 and vertical groove walls 172 that are directly connected by a bend. The vertical groove wall 172 is perpendicular to the end face of the nut 11, and the inclined groove wall 171 is inclined to the end face of the nut 11. The inclination direction of the groove wall 171 is the same as the tightening direction of the internal thread of the nut 11. The inclination angle of the inclination groove wall 171 is the same as the inclination angle of the inclination tooth surface 161 of the retaining tooth 16 on the washer 10. Generally, the inclination angle of the inclination groove wall 171 relative to the end face of the nut is made to be greater than 1° and less than 30°. In this embodiment, it is made to be 5°. When the nut 11 is screwed in close to the washer 10, the inclination groove wall 171 of the tooth groove 17 on the nut 11 will gradually press the elastic retaining tooth on the washer 10. When it transitions to the vertical groove wall 172, the elastic retaining tooth will be restored, so that the elastic retaining tooth supports the vertical groove wall 172, so that the nut 11 can only be tightened and cannot be loosened. Example

[0035] like Figure 5As shown, a special anti-loosening and anti-theft bolt for railway rails is manufactured. Several grooves 17 are directly formed on the inner end face of the nut 14 on the bolt 13. The structure of the grooves 17 matches the structure of the retaining teeth 16, allowing the retaining teeth 16 to be stably embedded in the grooves 17. The number of grooves 17 is an integer multiple of the number of retaining teeth on the washer. The grooves 17 are radially and evenly distributed on the inner end face of the nut. The groove walls of the grooves 17 include inclined groove walls 171 and vertical groove walls 172 that are directly connected by a bend. The vertical groove wall 172 is perpendicular to the inner end face of the nut, and the inclined groove wall 171 is inclined to the inner end face of the nut. The inclination direction of the groove wall 171 is the same as the tightening direction of the external thread on the bolt 13. The inclination angle of the inclination groove wall 171 is the same as the inclination angle of the inclination tooth surface 161 of the retaining tooth 16 on the washer 10. Generally, the angle between the inclination groove wall and the inner end face of the nut is made to be 1° and less than 30°, and it is kept to be 5°. When the bolt 13 is screwed in and the nut 14 is close to the washer 10, the inclination groove wall 171 of the tooth groove 17 on the nut 14 will gradually press the elastic retaining tooth on the washer 10. When it transitions to the vertical groove wall 172, the elastic retaining tooth will be restored, so that the elastic retaining tooth supports the vertical groove wall 172, so that the bolt 13 can only be tightened and cannot be loosened. Example

[0036] like Figure 6 As shown, a railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer are provided, including washer 10 and nut 11. The lower surface of washer 10 is provided with a locking protrusion 15; the upper surface of washer 10 is provided with locking teeth 16; a plurality of tooth grooves 17 are directly formed on one end face of nut 11. The structure of the tooth grooves 17 matches the structure of the locking teeth 16, so that the locking teeth 16 and the tooth grooves 17 can be stably engaged with each other, thereby enabling washer 10 to be locked in the central bend hole 9 of butterfly-shaped spring clip 8 on the rail and unable to move, thus preventing nut 11 from loosening.

[0037] When the nut 11 in the nut assembly is combined with the washer 10, the structure of the groove 17 matches the structure of the retaining tooth 16, so that the retaining tooth 16 and the groove 17 are stably engaged with each other; the number of grooves 17 on the nut 11 is an integer multiple of the number of retaining teeth 16 on the washer 10, and the grooves 17 are radially and evenly distributed on the end face of the nut 11; the inclination angle of the inclined groove wall 171 of the groove 17 is the same as the inclination angle of the inclined tooth surface 161 of the retaining tooth 16 on the washer 10. When the nut 11 is screwed in close to the washer 10, the inclined groove wall 171 of the groove 17 on the nut 11 will gradually press the elastic retaining tooth on the washer 10. When it transitions to the vertical groove wall 172, the elastic retaining tooth will recover, so that the elastic retaining tooth supports the vertical groove wall 172, so that the nut 11 can only be tightened and cannot be loosened.

[0038] When installing the nut assembly, a screw rod 2 is fixedly installed on the concrete sleeper of the railway. First, the through hole on the gauge baffle 7 is installed on the screw rod 2. Then, the butterfly-shaped spring clip 8 on the rail 5 is clamped on the screw rod 2. Next, the washer 10 is passed through the screw rod 2 and the locking protrusion on the washer 10 is inserted into the central bend 9 of the butterfly-shaped spring clip 8. Then, the nut 11 is screwed into the screw rod 2 and the tooth groove 17 on the nut 11 is pressed against the locking tooth 16 on the washer 10. The tooth groove 17 and the locking tooth 16 are stably engaged and embedded in each other. In this way, the washer 10 is locked in the central bend 9 of the butterfly-shaped spring clip 8 and will not loosen. Consequently, the nut 11 will also not loosen. Example

[0039] An anti-loosening and anti-theft bolt assembly includes a washer 10 and a bolt 13. The lower surface of the washer 10 is provided with a locking protrusion 15; the upper surface of the washer 10 is provided with locking teeth 16; a plurality of grooves 17 are directly formed on the inner end face of the nut 14 on the bolt 13. The structure of the grooves 17 matches the structure of the locking teeth 16, so that the locking teeth 16 and the grooves 17 can be stably engaged with each other, thereby enabling the washer 10 to be locked in the central bend 9 of the butterfly-shaped spring clip 8 on the track and unable to move, thus preventing the bolt 13 from loosening.

[0040] When the bolt 13 in the bolt assembly is combined with the washer 10, the structure of the groove 17 matches the structure of the retaining tooth 16, so that the retaining tooth 16 and the groove 17 are stably embedded in each other; the number of grooves 17 on the bolt nut 14 is an integer multiple of the number of retaining teeth 16 on the washer 10, and the grooves 17 are radially and evenly distributed on the end face of the nut 14; the inclination angle of the inclined groove wall 171 of the groove 17 is the same as the inclination angle of the inclined tooth surface 161 of the retaining tooth 16 on the washer 10. When the nut 14 on the bolt 13 is screwed in close to the washer 10, the inclined groove wall 171 of the groove 17 on the nut 14 will gradually press the elastic retaining tooth on the washer 10. When it transitions to the vertical groove wall 172, the elastic retaining tooth will recover, so that the elastic retaining tooth supports the vertical groove wall 172, so that the bolt 13 can only be tightened and cannot be loosened.

[0041] When installing bolt assemblies, the pre-embedded sleeve 12 is fixedly installed on the concrete sleeper 1 of the railway. First, the gauge baffle 7 is clamped on the sleeper 1. Then, the butterfly spring clip 8 is pressed on the gauge baffle 7 and the rail base 6. Next, the washer 10 is placed on the butterfly spring clip 8 and the locking protrusion 15 on the washer 10 is inserted into the central bend 9 of the butterfly spring clip 8. Then, the bolt 13 is passed through the hole of the washer 10, then through the central bend 9 of the butterfly spring clip, then through the through hole on the gauge baffle 7, and then screwed into the pre-embedded sleeve 12 on the sleeper 1. It is tightened so that the tooth groove 17 on the inner end face of the nut 14 on the bolt 13 and the locking tooth 16 on the upper surface of the washer 10 are interlocked. In this way, the washer 10 will not loosen in the central bend 9 of the butterfly spring clip, and thus the bolt 13 will also not loosen. Example

[0042] After the nut 11 with the vertical groove wall is installed on the rail 5, it can only be tightened and cannot be loosened. This achieves the effect of preventing loosening and theft, but it cannot be removed for maintenance. In order to remove and maintain it, the vertical tooth surface 162 on the washer 10 and the vertical groove wall 172 on the nut 11 can be slightly tilted, so that the nut 11 can be loosened and removed under a large torque. That is, the vertical tooth surface 162 of the retaining tooth 16 on the washer 10 is tilted 1°-15° in the direction of loosening the nut 11, and in this case, it is tilted 5°, and / or the vertical groove wall 172 on the nut 11 is tilted 1°-15° in the direction of loosening the nut 11, and in this case, it is tilted 5°; and / or the vertical groove wall 172 on the nut 14 of the bolt 13 is tilted 1°-15° in the direction of loosening the bolt, and in this case, it is tilted 5°.

Claims

1. A special anti-loosening and anti-theft nut assembly, bolt assembly, and washer for railway rails, comprising a washer (10) and a nut (11), characterized in that... The lower surface of the gasket (10) is provided with a locking protrusion (15); the upper surface of the gasket (10) is provided with locking teeth (16); a plurality of tooth grooves (17) are directly generated on one end face of the nut (11), and the structure of the tooth grooves (17) matches the structure of the locking teeth (16).

2. The railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer according to claim 1, characterized in that... The vertical groove wall (172) of the toothed groove (17) on the nut (11) is inclined inward, and the angle between the surface of the vertical groove wall (172) and the end face of the nut is 90°-60°.

3. A special anti-loosening and anti-theft nut assembly, bolt assembly, and washer for railway rails, comprising a washer (10) and a bolt (13), characterized in that... The lower surface of the gasket (10) is provided with a locking protrusion (15); the upper surface of the gasket (10) is provided with locking teeth (16); a number of tooth grooves (17) are directly generated on the inner end face of the nut (14) on the bolt (13), and the structure of the tooth grooves (17) matches the structure of the locking teeth (16).

4. The railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer according to claim 3, characterized in that... The vertical groove wall (172) on the nut (14) of the bolt (13) is inclined inward, and the angle between the surface of the vertical groove wall (172) and the inner end face of the nut is 90°-60°.

5. The railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer according to claim 1 or 3, characterized in that... The number of grooves (17) on the nut (11) or nut (14) is an integer multiple of the number of teeth on the washer (10), and the grooves (17) are radially and evenly distributed on the end face of the nut (11) or nut (14).

6. The railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer according to claim 5, characterized in that... The locking teeth (16) are either elastic locking teeth or non-elastic locking teeth. The elastic locking teeth are formed by cutting a section of the gasket (10) and bending it upwards to form an elastic locking tooth that can be compressed back after being extended. The non-elastic locking teeth are directly generated or welded onto the upper surface of the gasket.

7. The railway rail-specific anti-loosening and anti-theft nut assembly, bolt assembly, and washer according to claim 6, characterized in that... The number of the locking teeth (16) is one or several. When several are set, the locking teeth (16) are radially and evenly distributed on the upper surface of the gasket (10).

8. A special anti-loosening and anti-theft shim for railway rails, characterized in that... The lower surface of the gasket (10) is provided with a locking protrusion (15) for insertion into the central bend (9) of the butterfly spring clip (8). There is one or two locking protrusions (15). When two are provided, the two locking protrusions (15) are centrally symmetrical with the center of the circular hole of the gasket (10) as the center point. The upper surface of the gasket (10) is provided with locking teeth (16). The surface of the locking teeth (16) includes an inclined tooth surface (161) and a vertical tooth surface (162) that are directly connected by a turning bend. The vertical tooth surface (162) is perpendicular to the upper surface of the gasket (10), and the inclined tooth surface (161) is inclined to the upper surface of the gasket (10). The inclination direction of the inclined tooth surface (161) is opposite to the tightening direction of the internal thread of the nut (11).

9. The anti-loosening and anti-theft shim for railway rails according to claim 8, characterized in that... The inclined tooth surface (161) of the gasket (10) has an inclination angle of 1°-30° relative to the upper surface of the gasket (10).

10. The anti-loosening and anti-theft shim for railway rails according to claim 9, characterized in that... The vertical tooth surface (162) of the retaining tooth (16) on the gasket (10) is inclined at 1°-15° in the direction of loosening the nut; and / or the vertical groove wall (172) on the nut (11) is inclined at 1°-15° in the direction of loosening the nut.

11. The anti-loosening and anti-theft shim for railway rails according to claim 10, characterized in that... The vertical tooth surface (162) of the tooth (16) on the gasket (10) is inclined inward, and the angle between the tooth surface and the upper surface of the gasket (10) is 90°-60°.

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