Anti-loosening nut on rail

Abstract

The utility model relates to an anti-loosing nut on a rail, which comprises a bolt and a nut cap matched with the bolt, the nut cap is a closed nut, the bolt comprises a bolt head, the top of the bolt head is fixedly connected with a polish rod part, one side of the polish rod part far away from the bolt head is provided with a thread part with an integrated structure, and the thread part is connected with the bolt head. An elastic piece set is arranged at the end, away from the polished rod part, of the threaded part, an expansion material layer is arranged in the elastic piece set, and a containing cavity matched with the elastic piece set is formed in the nut cap. According to the anti-loosening nut on the rail, through the design that the elastic piece set at one end of the bolt is matched with the containing cavity in the nut cap, when the nut cap is screwed on the bolt, the elastic piece set can be compressed and stretch into the containing cavity, then an expansion material layer is expanded and solidified in a water injection mode, and therefore the two elastic pieces are limited, and then the purpose that the nut and the bolt are locked is achieved; therefore, the anti-loosening effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to railway technical field, concretely is a nut on the rail anti-loose. BACKGROUND

[0002] In the railway transportation system, the connection stability of the rail is directly related to the safety of train operation and the service life of the track.

[0003] Due to the continuous vibration and impact load generated during train operation, the traditional nut is prone to loosening after long-term use, which leads to the failure of the rail connecting piece, and further causes track geometric deformation, bolt fracture and even derailment and other serious accidents. Early anti-loose measures mainly rely on spring washers or double nut structure, but these methods have limited effect under high-frequency vibration and heavy load conditions. The double nut structure requires precise installation process to ensure uniform distribution of the pre-tightening force between the two nuts. If installed improperly, one of the nuts may loosen prematurely, affecting the overall anti-loose effect. In addition, the extra nut increases the weight and cost. SUMMARY

[0004] In view of the deficiencies of the prior art, the utility model provides a nut on the rail anti-loose, which has the effect of preventing the nut from loosening.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a nut on the rail anti-loose, comprising a bolt and a nut cap matched with the bolt, the nut cap is a closed nut, the bolt comprises a bolt head, the top of the bolt head is fixedly connected with a polished rod part, the polished rod part is provided with a threaded part of an integral structure on the side away from the bolt head, the threaded part is provided with a spring piece group at the end away from the polished rod part, the inside of the spring piece group is provided with an expansion material layer, and the inside of the nut cap is provided with a containing cavity matched with the spring piece group.

[0006] Preferably, the spring piece group comprises two symmetrically arranged spring pieces, the upper half of the spring piece is semicircular, and the lower half of the spring piece is a semicircular cylinder.

[0007] Preferably, the top of the nut cap is provided with an injection hole communicating with the containing cavity, and the lower part of the containing cavity is trumpet-shaped.

[0008] Preferably, a gap of 0.2-0.4mm is left between the two spring pieces, and the two spring pieces can extend into the inside of the containing cavity in the closed state.

[0009] Preferably, expansion cavities are formed on the opposite sides of the upper half of the two spring pieces, and through holes communicating with the expansion cavities are formed on the top of the spring piece.

[0010] Preferably, the expansion material layer is located between two expansion cavities, the volume of the initial state of the expansion material layer is less than the inner volume of the expansion cavity, and the expansion material layer is any one of bentonite particles, chemical foaming expansion glue, water-swelling rubber and metal sodium-based expansion agent.

[0011] Compared with the prior art, the technical scheme of the application has the following beneficial effects:

[0012] The expansion material layer is expanded and solidified through water injection, thereby limiting the two spring sheets, and the purpose of locking the nut cap and the bolt is achieved, thereby achieving the anti-loosening effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The utility model provides a bolt and nut cap structure schematic view.

[0014] Figure 2 The utility model provides a bolt and nut cap sectional view.

[0015] Figure 3 The utility model provides Figure 2 The structure enlarged view of A in the middle.

[0016] Reference signs: 1, bolt;11, bolt head;11, polished rod part;12, threaded part;2, nut cap;21, accommodating cavity;22, injection hole;3, spring sheet group;31, expansion cavity;32, through hole;4, expansion material layer. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] Please refer to Figures 1-3 In the embodiment, the anti-loosening nut on the rail comprises a bolt 1 and a nut cap 2 matched with the bolt 1, the nut cap 2 is a closed nut, the bolt 1 comprises a bolt head 11, the top of the bolt head 11 is fixedly connected with a polished rod part 12, the polished rod part 12 is provided with a threaded part 13 in an integral structure on the side away from the bolt head 11, the threaded part 13 is provided with a spring sheet group 3 on the end away from the polished rod part 12, the inside of the spring sheet group 3 is provided with an expansion material layer 4, and the inside of the nut cap 2 is provided with an accommodating cavity 21 matched with the spring sheet group 3.

[0019] The elastic sheet group 3 in the embodiment includes two symmetrical elastic sheets, the upper half of the elastic sheet is a half-ellipse, and the lower half of the elastic sheet is a half-cylinder.

[0020] Please refer to Figure 2 The top of the nut cap 2 is provided with a pouring hole 22 which is in communication with the accommodating cavity 21, and the lower part of the accommodating cavity 21 is trumpet-shaped.

[0021] It should be noted that the lower part of the accommodating cavity 21 is trumpet-shaped to facilitate the elastic sheet group 3 to extend into the interior of the accommodating cavity 21.

[0022] In the embodiment, a gap of 0.2-0.4 mm is left between the two elastic sheets, and the two elastic sheets can extend into the interior of the accommodating cavity 21 in the closed state.

[0023] The gap between the two elastic sheets enables the elastic sheets to close and reduce in diameter when being pressed, thereby being clamped in the accommodating cavity 21.

[0024] Please refer to Figure 3 In the embodiment, the two elastic sheets are each provided with an expansion cavity 31 on the opposite side of the upper half, the top of the elastic sheet is provided with a through hole 32 which is in communication with the expansion cavity 31, the expansion material layer 4 is located between the two expansion cavities 31, the initial volume of the expansion material layer 4 is smaller than the inner volume of the expansion cavity 31, and the expansion material layer 4 is any one of bentonite particles, chemical foaming expansion glue, water-swelling rubber and metal sodium-based expanding agent.

[0025] It should be noted that the expansion material layer 4 can be expanded and solidified by being injected with water.

[0026] The working principle of the above embodiment is as follows: in use, the bolt 1 is first passed through the mounting member to be fastened, and then the nut cap 2 is screwed on the bolt 1, the elastic sheet group 3 is compressed and filled in the accommodating cavity 21 when being screwed, and then water is injected into the expansion cavity 31 through the pouring hole 22 and the through hole 32, so that the expansion material layer 4 is expanded and solidified, thereby limiting the two elastic sheets, and then the purpose of locking the nut cap and the bolt is achieved.

[0027] It should be noted that, in the present document, the terms such as first and second, and the like, are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between such entities or operations. Moreover, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus including the element.

[0028] While the embodiments of the present application have been illustrated and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the present application, which should be limited only by the appended claims and their equivalents.

Claims

1. A loose nut prevention nut for a rail, comprising a bolt (1) and a nut cap (2) adapted to the bolt (1), characterized in that, The nut cap (2) is a closed nut, the bolt (1) includes a bolt head (11), the top of the bolt head (11) is fixedly connected with a polished rod part (12), the polished rod part (12) is provided with a threaded part (13) of an integral structure on the side away from the bolt head (11), the threaded part (13) is provided with a spring piece group (3) on the end away from the polished rod part (12), the spring piece group (3) is provided with an expansion material layer (4) in the inside, and the nut cap (2) is provided with an accommodating cavity (21) matched with the spring piece group (3) in the inside.

2. A self-locking nut for railway tracks according to claim 1, characterized in that: The spring piece group (3) includes two symmetrical spring pieces, the upper half of the spring piece is a half-ellipse, and the lower half of the spring piece is a half-cylinder.

3. A self-locking nut for railway tracks according to claim 1, characterized in that: The top of the nut cap (2) is provided with an injection hole (22) in communication with the accommodating cavity (21), and the lower part of the accommodating cavity (21) is in a trumpet shape.

4. A lock nut for railway lines according to claim 2, characterized in that: A gap of 0.2-0.4mm is left between the two spring pieces, and the two spring pieces can be inserted into the inside of the accommodating cavity (21) in the closed state.

5. A self-locking nut for railway tracks according to claim 2, characterized in that: The opposite sides of the upper half of the two spring pieces are provided with expansion cavities (31), and the top of the spring piece is provided with a through hole (32) in communication with the expansion cavity (31).

6. A self-locking nut for railway tracks according to claim 5, characterized in that: The expansion material layer (4) is located between the two expansion cavities (31), and the expansion material layer (4) is any one of bentonite particles, chemical foaming expansion glue, water-swelling rubber and metal sodium-based expanding agent.

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