A type of anti-loosening device for bolted connections of railway turnouts

Abstract

This utility model provides a bolt connection anti-loosening device for railway turnouts, relating to the field of bolt anti-loosening technology. It includes a screw rod; a base adapted to at least partially fit against the opposite side of the rail thickness, the base being sleeved on the outer periphery of the screw rod, and a first mating part on the base; a nut threadedly connected to the screw rod and located on the side of the base away from the rail; and an anti-loosening plate with a second mating part and a limiting hole. The first and second mating parts cooperate to restrict the circumferential freedom of the anti-loosening plate and the base, and the inner circumferential wall of the limiting hole cooperates with the outer circumferential wall of the nut to restrict the circumferential freedom of the anti-loosening plate and the nut. This utility model effectively restricts the relative rotation between the anti-loosening plate, the base, and the nut through the cooperation of the anti-loosening plate, the base, and the nut, enhancing the stability of the bolt connection. Furthermore, the short bolt length allows it to adapt to scenarios where bolt length is limited.

Description

Technical Field

[0001] This utility model relates to the field of bolt anti-loosening technology, specifically to a bolt connection anti-loosening device for railway turnouts. Background Technology

[0002] As trains pass over railway tracks and turnouts, the wheels exert long-term, high-frequency impacts on the tracks and turnouts, which can easily cause bolts to loosen, reducing the axial tensile force of the bolt connections. This, in turn, affects the stability of the track and turnout structure and its installation, endangering train safety. Therefore, the railway turnout industry must install stable and reliable anti-loosening devices for bolt connections to lock the installation status of the bolt connections, thereby ensuring the safety and stability of the track and turnout structure.

[0003] In the prior art, a double-nut structure is used to prevent the nuts from loosening. However, this structure increases the bolt length, which is not suitable for situations where the bolt length is limited. Furthermore, if the outer nut loosens, the inner nut will also loosen, resulting in a limited anti-loosening effect of this structure. Utility Model Content

[0004] The purpose of this utility model is to provide a locking anti-loosening device for railway turnout bolt connections to improve the above-mentioned problems. To achieve the above objective, the technical solution adopted by this utility model is as follows:

[0005] This application provides a bolt-fitting anti-loosening device for railway turnout bolt connections, comprising: a screw rod, wherein the nut of the screw rod is located on one side of the rail thickness direction, and the lead screw of the screw rod passes through the rail web and is located on the other side of the rail thickness direction; a base, the base being adapted to fit at least a portion of the other side of the rail thickness direction, and the base being sleeved on the outer periphery of the lead screw, and the base being provided with a first mating part; a nut, the nut being threadedly connected to the lead screw and located on the side of the base away from the rail; and an anti-loosening plate, the anti-loosening plate being provided with a second mating part and a limiting hole, the first mating part cooperating with the second mating part to limit the circumferential freedom of the anti-loosening plate and the base, and the inner peripheral wall of the limiting hole cooperating with the outer peripheral wall of the nut to limit the circumferential freedom of the anti-loosening plate and the nut.

[0006] According to some embodiments of the present invention, the first mating part includes a first snap-fit ​​part, and the second mating part includes a second snap-fit ​​part. The first snap-fit ​​part and the second snap-fit ​​part cooperate to connect the anti-loosening plate to the base.

[0007] According to some embodiments of the present invention, one of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​hole, and the other of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​block. The snap-fit ​​block is received in the snap-fit ​​hole to connect the anti-loosening piece to the base.

[0008] According to some embodiments of the present invention, the base is provided with a plurality of snap-fit ​​blocks spaced apart in the circumferential direction, and the anti-loosening plate is provided with snap-fit ​​holes corresponding one-to-one with the plurality of snap-fit ​​blocks.

[0009] According to some embodiments of the present invention, the first mating part includes a connecting channel, and the second mating part includes a connecting flange, at least a portion of which is received within the connecting channel to connect the anti-loosening plate to the base.

[0010] According to some embodiments of the present invention, the side surface of the base away from the rail is the first surface, the side surface of the base that is connected to the first surface in the horizontal direction is the second surface, one end of the connecting channel extends to the first surface, the other end of the connecting channel extends to the second surface, the part of the connecting flange is located in the connecting channel, and the other part of the connecting flange is in contact with the second surface.

[0011] According to some embodiments of the present invention, the connecting channel includes a first channel segment, a second channel segment, and an arc segment, wherein the arc segment is disposed between the first channel segment and the second channel segment, and the arc segment is adapted to guide the deformation of the connecting flange.

[0012] According to some embodiments of this utility model, the connecting channel is constructed as two, the two connecting channels are symmetrical about the axis of the screw, and the connecting flange is constructed as two, the two connecting flanges correspond to the two connecting channels respectively.

[0013] According to some embodiments of the present invention, the nut has a hexagonal cross-section, the limiting hole includes a central hole and multiple limiting grooves, the inner peripheral wall of the central hole is provided with multiple limiting grooves, and at least some of the limiting grooves are adapted to accommodate the six corners of the nut.

[0014] According to some embodiments of the present invention, a receiving groove is provided on the side surface of the base away from the rail, and a washer suitable for abutting against the nut is provided in the receiving groove, and the projection of the nut on the screw axis is located in the washer.

[0015] The beneficial effects of this utility model are as follows:

[0016] This utility model achieves the cooperation between the anti-loosening plate, the base, and the nut by setting a first mating part on the base, a second mating part on the anti-loosening plate, and a limiting hole. This effectively restricts the relative rotation between the anti-loosening plate, the base, and the nut, enhances the stability of the bolt connection pair, reduces rail connection failures caused by bolt loosening, and improves the safety of railway operation. Compared with the anti-loosening structure with double nuts, this application can reduce the bolt length through the above-mentioned setting to adapt to scenarios where bolt length is limited. At the same time, for the anti-loosening structure with double nuts, the loosening of the outer nut will cause the inner nut to loosen, while this application can effectively prevent the nut from loosening through the above-mentioned setting, thus achieving a stable improvement in the stability of the bolt connection pair.

[0017] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the anti-loosening device for the bolt connection of railway turnouts according to this utility model;

[0020] Figure 2 This is an exploded view of the anti-loosening device for the bolt connection of railway turnouts according to this utility model;

[0021] Figure 3 This is a schematic diagram of the anti-loosening sheet of this utility model;

[0022] Figure 4 This is a schematic diagram of the base of this utility model.

[0023] Markings in the diagram: 1. Rail; 10. Screw; 20. Base; 21. Snap-fit ​​block; 22. Connecting channel; 23. First surface; 24. Second surface; 30. Nut; 40. Anti-loosening plate; 41. Snap-fit ​​hole; 42. Connecting flange; 43. Limiting hole; 50. Washer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this utility model, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1-4 As shown, this embodiment provides a bolt connection anti-loosening device for railway turnouts, including: a screw 10, a base 20, a nut 30, and an anti-loosening plate 40. The nut of the screw 10 is located on one side of the rail 1 in the thickness direction, and the lead screw of the screw 10 passes through the rail web and is located on the other side of the rail 1 in the thickness direction. The base 20 is adapted to fit at least a portion of the other side of the rail 1 in the thickness direction, and the base 20 is sleeved on the outer periphery of the lead screw. The base 20 is provided with a first mating part. The nut 30 is threadedly connected to the lead screw and is located on the side of the base 20 away from the rail 1. The anti-loosening plate 40 is provided with a second mating part and a limiting hole 43. The first mating part and the second mating part cooperate to limit the degree of freedom of the anti-loosening plate 40 and the base 20 in the circumferential direction. The inner peripheral wall of the limiting hole 43 cooperates with the outer peripheral wall of the nut 30 to limit the degree of freedom of the anti-loosening plate 40 and the nut 30 in the circumferential direction.

[0027] In some embodiments, the rail 1 is provided with a first through hole extending in its own thickness direction, and the base 20 is provided with a second through hole extending in its own thickness direction. The extension directions of the first through hole and the second through hole are parallel to each other, and the axis of the first through hole and the axis of the second through hole are on the same straight line. The nut of the screw 10 is located on one side of the rail 1 in the thickness direction. The lead screw portion of the screw 10 is located in the first through hole and the second through hole, and the other part of the lead screw protrudes from the side of the base 20 away from the rail 1 and is threadedly connected to the nut 30. The base 20 is in contact with at least a portion of the surface on the other side of the rail 1 in the thickness direction. Here, the base 20 may be in contact with the rail web of the rail 1, or the base 20 may be in contact with the rail web and the rail head of the rail 1. There is no limitation here.

[0028] Preferably, the surface of the base 20 facing the rail 1 is constructed as an arc-shaped surface that fits against the web surface of the rail 1. This design ensures that after the nut 30 is tightened, the base 20 is tightly fitted and fixed to the web of the rail, providing a stable mounting surface to prevent the nut 30 from loosening. Furthermore, the arc-shaped surface of the base 20 facing the rail 1 allows the base 20 to engage with the rail 1, preventing the base 20 from rotating relative to the rail 1.

[0029] The base 20 is provided with a first mating part, and the anti-loosening plate 40 is provided with a second mating part and a limiting hole 43. The second mating part cooperates with the first mating part on the base 20 to restrict the degree of freedom of the anti-loosening plate 40 and the base 20 in the circumferential direction, and to prevent the anti-loosening plate 40 from rotating relative to the base 20. The inner peripheral wall of the limiting hole 43 cooperates with the outer peripheral wall of the nut 30 to restrict the degree of freedom of the anti-loosening plate 40 and the nut 30 in the circumferential direction, and to prevent the nut 30 from loosening and rotating. Thus, through the cooperation of the first mating part and the second mating part, and the cooperation of the limiting hole 43 and the nut 30, the anti-loosening plate 40 can effectively prevent the nut 30 from loosening due to vibration and other reasons during train operation, thereby ensuring the stability of the railway turnout bolt connection pair.

[0030] It is worth mentioning that the first mating part on the base 20 and the second mating part on the anti-loosening plate 40 cooperate with each other. The mating method can be various forms such as snap-fit ​​or plug-in. Through the above settings, the anti-loosening plate 40 and the base 20 are fixed in the circumferential direction, so that the anti-loosening plate 40 cannot rotate relative to the base 20.

[0031] According to the railway turnout bolt connection pair snap-fit ​​anti-loosening device of this utility model, by setting a first mating part on the base 20, a second mating part on the anti-loosening plate 40, and a limiting hole 43, the anti-loosening plate 40 is mated with the base 20 and the nut 30, which effectively restricts the relative rotation between the anti-loosening plate 40, the base 20 and the nut 30, enhances the stability of the bolt connection pair, reduces the rail connection failure caused by bolt loosening, and improves the safety of railway operation.

[0032] Furthermore, compared to the anti-loosening structure with double nuts, this application can reduce the length of the screw 10 through the above-mentioned setting to adapt to scenarios where the bolt length is limited. At the same time, for the anti-loosening structure with double nuts, the loosening of the outer nut will cause the inner nut to loosen. However, this application can effectively prevent the nut 30 from loosening through the above-mentioned setting, thereby achieving a stable improvement in the stability of the bolt connection pair.

[0033] According to some embodiments of the present invention, the first mating part includes a first snap-fit ​​part, and the second mating part includes a second snap-fit ​​part. The first snap-fit ​​part and the second snap-fit ​​part cooperate to connect the anti-loosening piece 40 to the base 20.

[0034] In some embodiments, the principle of the snap-fit ​​is to utilize specific shape structures on the components, such as protrusions and grooves, so that when two components are close to each other, they can be connected and fixed by the mutual insertion and interlocking of these structures. In this application, the first snap-fit ​​part and the second snap-fit ​​part have mutually matching shapes. When the anti-loosening plate 40 is assembled with the base 20, the first snap-fit ​​part can accurately embed or snap into the second snap-fit ​​part to form a tight connection. After the first snap-fit ​​part and the second snap-fit ​​part are snapped together, the anti-loosening plate 40 and the base 20 form a whole in the circumferential direction. When the nut 30 is subjected to external forces such as vibration generated by train operation, causing the nut 30 to loosen and drive the anti-loosening plate 40 to rotate, the anti-loosening plate 40 cannot rotate relative to the base 20 due to the snap-fit ​​action of the first snap-fit ​​part and the second snap-fit ​​part. The anti-loosening plate 40 also cooperates with the nut 30 through the limiting hole 43 to restrict the rotation of the nut 30, thereby preventing the nut 30 from loosening.

[0035] According to some embodiments of the present invention, one of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​hole 41, and the other of the first snap-fit ​​portion and the second snap-fit ​​portion is a snap-fit ​​block 21. The snap-fit ​​block 21 is accommodated in the snap-fit ​​hole 41 to connect the anti-loosening piece 40 to the base 20.

[0036] In some embodiments, the first snap-fit ​​part is configured as a snap-fit ​​hole 41. In this case, the base 20 is provided with a snap-fit ​​hole 41, and the anti-loosening plate 40 is provided with a snap-fit ​​block 21. After the base 20 and the anti-loosening plate 40 are respectively sleeved on the lead screw, the snap-fit ​​block 21 on the anti-loosening plate 40 is received in the snap-fit ​​hole 41 on the base 20 to realize the snap-fit ​​engagement between the base 20 and the anti-loosening plate 40.

[0037] In some other embodiments, the first locking part is constructed as a locking block 21. In this case, the locking block 21 is provided on the base 20 and the locking hole 41 is provided on the anti-loosening plate 40. After the base 20 and the anti-loosening plate 40 are respectively sleeved on the lead screw, the locking block 21 on the base 20 is received in the locking hole 41 on the anti-loosening plate 40 to realize the locking engagement between the base 20 and the anti-loosening plate 40.

[0038] According to some embodiments of the present invention, the base 20 is provided with a plurality of snap-fit ​​blocks 21 spaced apart in the circumferential direction, and the anti-loosening plate 40 is provided with snap-fit ​​holes 41 corresponding one-to-one with the plurality of snap-fit ​​blocks 21.

[0039] It is understandable that the locking blocks 21 are spaced apart around the base 20 and correspond one-to-one with the locking holes 41 on the anti-loosening plate 40. When the nut 30 is subjected to external force and tends to loosen and attempts to drive the anti-loosening plate 40 to rotate, the multiple locking blocks 21 are blocked by the inner wall of the corresponding locking holes 41. That is, the cooperation of the multiple locking blocks 21 and the multiple locking holes 41 forms multiple constraint points in the circumferential direction. The multiple constraint points work together to effectively restrict the circumferential rotation of the anti-loosening plate 40 relative to the base 20. At the same time, the cooperation between the anti-loosening plate 40 and the nut 30 restricts the rotation of the nut 30, thereby achieving the purpose of anti-loosening.

[0040] According to some embodiments of the present invention, the first mating part includes a connecting channel 22, and the second mating part includes a connecting flange 42. At least a portion of the connecting flange 42 is received within the connecting channel 22 to connect the anti-loosening piece 40 to the base 20.

[0041] In some embodiments, the connecting channel 22 provides a space for the connecting flange 42. The shape and size of the connecting channel 22 can be adapted to the connecting flange 42. When the anti-loosening plate 40 is installed on the base 20, the connecting flange 42 is inserted into the connecting channel 22. At this time, in the circumferential direction, the inner wall of the connecting channel 22 will block the connecting flange 42. When the nut 30 tends to loosen and drive the anti-loosening plate 40 to rotate, the connecting flange 42 is restricted in the connecting channel 22 and cannot rotate freely, so the anti-loosening plate 40 cannot rotate relative to the base 20. The anti-loosening plate 40 also cooperates with the nut 30 through the limiting hole 43 to restrict the rotation of the nut 30, thereby effectively preventing the nut 30 from loosening.

[0042] According to some embodiments of the present invention, the side surface of the base 20 facing away from the rail 1 is the first surface 23, the side surface of the base 20 that is connected to the first surface 23 in the horizontal direction is the second surface 24, one end of the connecting channel 22 extends to the first surface 23, the other end of the connecting channel 22 extends to the second surface 24, a portion of the connecting flange 42 is located inside the connecting channel 22, and the other portion of the connecting flange 42 is in contact with the second surface 24.

[0043] In some embodiments, the connecting channel 22 extends from the first surface 23 to the second surface 24, thereby providing a clear path for the insertion of the connecting flange 42. Specifically, when installing the anti-loosening tab 40, the operator can insert the connecting flange 42 along the connecting channel 22 from one side of the first surface 23 until another part of the connecting flange 42 protrudes from the second surface 24. At this point, the operator can use tools or the like to bend the connecting flange 42 so that the other part of the connecting flange 42 fits against the second surface 24.

[0044] Therefore, by having part of the connecting flange 42 located within the connecting channel 22 and the other part abutting against the second surface 24, the connection between the anti-loosening plate 40 and the base 20 is ensured to be more stable. At this time, the connecting channel 22 constrains the connecting flange 42 in both the axial and circumferential directions, preventing the anti-loosening plate 40 from shaking or rotating. Meanwhile, the abutment between the connecting flange 42 and the second surface 24 provides additional support for the anti-loosening plate 40 in the horizontal direction, further enhancing the connection stability between the anti-loosening plate 40 and the base 20 and preventing the anti-loosening plate 40 from shifting in the horizontal direction.

[0045] According to some embodiments of the present invention, the connecting channel 22 includes a first channel segment, a second channel segment, and an arc segment. The arc segment is disposed between the first channel segment and the second channel segment, and the arc segment is adapted to guide the deformation of the connecting flange 42.

[0046] In some embodiments, during the installation of the anti-loosening plate 40, the connecting flange 42 enters from the first channel section. When it reaches the arc section, the arc section will cooperate with the connecting flange 42 to guide the connecting flange 42 to gradually bend or deform so that the connecting flange 42 can smoothly enter the second channel section and eventually protrude from the second surface 24.

[0047] It should be noted that after the connecting flange 42 undergoes arc-shaped deformation, its shape fits the connecting channel 22 more closely, increasing the contact area and friction between them. Simultaneously, the deformed connecting flange 42 forms a "clip-like" structure within the connecting channel 22, making it more difficult for it to detach from the channel 22 under external force, thus enhancing the stability of the connection between the anti-loosening plate 40 and the base 20.

[0048] According to some embodiments of this utility model, there are two connecting channels 22, which are symmetrical about the axis of the screw 10. There are also two connecting flanges 42, each corresponding to one of the two connecting channels 22. It is understood that the two connecting flanges 42 further improve the connection stability between the base 20 and the anti-loosening plate 40.

[0049] According to some embodiments of the present invention, the nut 30 has a hexagonal cross-section, and the limiting hole 43 includes a central hole and multiple limiting grooves. The inner peripheral wall of the central hole is provided with multiple limiting grooves, and at least some of the limiting grooves are suitable for receiving the six corners of the nut 30.

[0050] In some embodiments, after the nut 30 is tightened onto the screw 10, the anti-loosening plate 40 is installed in place, and the six corners of the nut 30 are embedded into the corresponding limiting grooves. When the nut 30 has a tendency to loosen and rotate, the limiting grooves will block the corners of the nut 30, restricting the rotation of the nut 30 in the circumferential direction. Because the nut 30 cannot rotate, the bolt will not loosen due to the loosening of the nut 30, thereby achieving the purpose of anti-loosening.

[0051] It is worth mentioning that since the six corners of the nut 30 are only partially accommodated in the limiting groove, the anti-loosening plate 40 of this application has a limiting groove suitable for directly accommodating the six corners of the nut 30, regardless of the angle at which the nut 30 is tightened. Thus, the above-mentioned arrangement allows the loosening plate 40 to cooperate well with the nut 30, thereby achieving the anti-loosening of the nut 30.

[0052] In other embodiments, the multiple limiting grooves are divided into two groups, each group having six limiting grooves. The six limiting grooves in each group are respectively adapted to accommodate the six corners of the nut 30. One group of limiting grooves is obtained by rotating the other group of limiting grooves by 30° relative to the center of the central hole.

[0053] According to some embodiments of the present invention, a receiving groove is provided on the side surface of the base 20 away from the rail 1, and a washer 50 suitable for abutting against the nut 30 is provided in the receiving groove. The projection of the nut 30 in the axial direction of the screw 10 is located in the washer 50.

[0054] In some embodiments, when the nut 30 is tightened onto the screw 10, the washer 50 is placed in the receiving groove and abuts against the nut 30. The presence of the washer 50 can increase the contact area and friction between the nut 30 and the base 20. When the nut 30 attempts to loosen and rotate, the washer 50 will hinder the rotation of the nut 30, thereby achieving the effect of preventing loosening.

[0055] Of course, the receiving groove provides a precise installation position for the gasket 50, ensuring that the gasket 50 can be accurately placed on the base 20 and correctly aligned with the nut 30. Moreover, the receiving groove can also fix the gasket 50 to prevent the gasket 50 from shifting during vibration, ensuring that the gasket 50 can always effectively resist the nut 30 and maintain the stable anti-loosening state of the nut 30.

[0056] It is worth mentioning that the receiving groove can accommodate the gasket 50, thereby reducing the length of the screw 10, thus making the railway turnout bolt connection pair locking anti-loosening device of this application suitable for scenarios where the bolt length is limited.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A locking anti-loosening device for railway turnout bolt connections, characterized in that, include: The screw (10) has a nut located on one side of the rail (1) in the thickness direction, and the lead screw of the screw (10) passes through the rail web and is located on the other side of the rail (1) in the thickness direction. A base (20) is adapted to fit at least part of the opposite side of the rail (1) with the thickness facing upward, and the base (20) is sleeved on the outer periphery of the lead screw, and a first mating part is provided on the base (20); Nut (30), which is threaded to the lead screw and located on the side of the base (20) away from the rail (1); The anti-loosening plate (40) is provided with a second mating part and a limiting hole (43). The first mating part and the second mating part cooperate to restrict the degree of freedom of the anti-loosening plate (40) and the base (20) in the circumferential direction. The inner peripheral wall of the limiting hole (43) cooperates with the outer peripheral wall of the nut (30) to restrict the degree of freedom of the anti-loosening plate (40) and the nut (30) in the circumferential direction.

2. The anti-loosening device for railway turnout bolt connections according to claim 1, characterized in that, The first mating part includes a first snap-fit ​​part, and the second mating part includes a second snap-fit ​​part. The first snap-fit ​​part and the second snap-fit ​​part cooperate to connect the anti-loosening plate (40) to the base (20).

3. The anti-loosening device for railway turnout bolt connections according to claim 2, characterized in that, One of the first and second snap-fit ​​parts is a snap-fit ​​hole (41), and the other of the first and second snap-fit ​​parts is a snap-fit ​​block (21). The snap-fit ​​block (21) is received in the snap-fit ​​hole (41) to connect the anti-loosening piece (40) to the base (20).

4. The anti-loosening device for railway turnout bolt connections according to claim 3, characterized in that, The base (20) is provided with a plurality of snap-fit ​​blocks (21) spaced apart in the circumferential direction, and the anti-loosening plate (40) is provided with snap-fit ​​holes (41) corresponding one-to-one with the plurality of snap-fit ​​blocks (21).

5. The anti-loosening device for railway turnout bolt connections according to claim 1, characterized in that, The first mating part includes a connecting channel (22), and the second mating part includes a connecting flange (42), at least a portion of which is received within the connecting channel (22) to connect the anti-loosening piece (40) to the base (20).

6. The anti-loosening device for railway turnout bolt connections according to claim 5, characterized in that, The side surface of the base (20) facing away from the rail (1) is the first surface (23), and the side surface of the base (20) that is connected to the first surface (23) in the horizontal direction is the second surface (24). One end of the connecting channel (22) extends to the first surface (23), and the other end of the connecting channel (22) extends to the second surface (24). A portion of the connecting flange (42) is located inside the connecting channel (22), and the other portion of the connecting flange (42) is in contact with the second surface (24).

7. The anti-loosening device for railway turnout bolt connections according to claim 6, characterized in that, The connecting channel (22) includes a first channel segment, a second channel segment and an arc segment. The arc segment is located between the first channel segment and the second channel segment and is adapted to guide the deformation of the connecting flange (42).

8. The anti-loosening device for railway turnout bolt connections according to claim 5, characterized in that, The connecting channel (22) is constructed in two parts, and the two connecting channels (22) are symmetrical about the axis of the screw (10). The connecting flange (42) is constructed in two parts, and the two connecting flanges (42) correspond to the two connecting channels (22) respectively.

9. The anti-loosening device for railway turnout bolt connections according to claim 1, characterized in that, The nut (30) has a hexagonal cross-section, and the limiting hole (43) includes a central hole and multiple limiting grooves. The inner peripheral wall of the central hole is provided with multiple limiting grooves, and at least some of the limiting grooves are adapted to accommodate the six corners of the nut (30).

10. The anti-loosening device for railway turnout bolt connections according to claim 1, characterized in that, The base (20) has a receiving groove on the side surface away from the rail (1), and a washer (50) suitable for abutting against the nut (30) is provided in the receiving groove. The projection of the nut (30) on the axial direction of the screw (10) is located in the washer (50).

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