Narrow-gauge prestressed concrete sleeper structure

Abstract

The application discloses a narrow-gauge prestressed concrete sleeper structure and relates to the technical field of railway sleepers. The structure comprises a main body made of concrete and used for bearing a basic rail and a bearing plate embedded in the main body. A support and a locking mechanism are arranged on the bearing plate. The support is slidingly connected to the bearing plate and used for supporting a point rail. The locking mechanism has a locking state of locking the support and an unlocking state of unlocking the support. When the point rail is to be changed, the locking mechanism is switched to the unlocking state. After the point rail is changed, the locking mechanism is switched to the locking state. The narrow-gauge prestressed concrete sleeper structure can switch the locking mechanism to the unlocking state in the process of changing the point rail, so that the point rail can drive the support to slide on the bearing plate until the changing of the point rail is completed. After the changing of the point rail is completed, the locking mechanism is switched to the locking state to lock and support the point rail, thereby improving the stability of the point rail.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of railway sleepers, in particular to a narrow-gauge prestressed concrete sleeper structure. BACKGROUND

[0002] The narrow-gauge prestressed concrete sleeper is a typical representative of the development of modern railway technology towards specialization and high performance. It applies prestressed technology, an efficient structural technology, to the traditional field of narrow-gauge railways, significantly improving the carrying capacity, running safety and economy of narrow-gauge lines, and is an important infrastructure for the modernization and heavy loading of narrow-gauge railways.

[0003] For example, the patent document with the authorization announcement number CN218756773U and the authorization announcement date of March 28, 2023, and the name of "a concrete sleeper with a pre-buried structure" includes a concrete sleeper main body and a pre-buried pile, which is arranged on both sides of the bottom end of the concrete sleeper main body. The pre-buried structure of the concrete sleeper can assemble the inserted anchor rod at the bottom of the concrete sleeper main body by screwing the threaded joint at the top of the inserted anchor rod into the threaded hole at the bottom end of the concrete sleeper main body.

[0004] In the prior art, a steel plate or other structure is generally arranged on the sleeper at the rail transition of the railway track to support the point rail transition. When the point rail is transitioned, one end is driven and the other end is fixed, while the middle section of the point rail is not restricted. For this part of the point rail that is not restricted, it needs to withstand a large load when the train passes. Obviously, this will affect the stability of the point rail. SUMMARY

[0005] The purpose of the present application is to provide a narrow-gauge prestressed concrete sleeper structure to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A narrow-gauge prestressed concrete sleeper structure includes a main body made of concrete and used to support a basic rail, and a load-bearing plate pre-buried on the main body, the load-bearing plate being provided with:

[0008] a support member slidingly connected to the load-bearing plate and used to support a point rail;

[0009] a locking mechanism having a locked state for locking the support member and an unlocked state for unlocking, when the point rail is to be transitioned, the locking mechanism is switched to the unlocked state, and after the point rail is transitioned, the locking mechanism is switched to the locked state.

[0010] The above-mentioned narrow-gauge prestressed concrete sleeper structure has a fixed rod formed on the support member, and a movable rod slidingly connected to the support member.

[0011] The narrow-gauge prestressed concrete sleeper structure has a movable groove formed on the bearing plate and a movable block formed on the support.

[0012] The narrow-gauge prestressed concrete sleeper structure has a locking mechanism comprising a friction plate slidably connected in the movable groove, and the friction plate and the movable block are formed with wedge-shaped friction surfaces that are adapted to each other.

[0013] The narrow-gauge prestressed concrete sleeper structure has the locking mechanism in a locked state when the friction plate is close to the movable block so that the two wedge-shaped friction surfaces are in contact, and the locking mechanism is in an unlocked state when the friction plate is away from the movable block so that the two wedge-shaped friction surfaces are separated.

[0014] The narrow-gauge prestressed concrete sleeper structure has an inclined groove formed on the support, and a sliding block slidably connected in the inclined groove, and the movable rod is fixed on the sliding block.

[0015] The narrow-gauge prestressed concrete sleeper structure has the distance between the movable rod and the bearing plate gradually increasing when the sliding block is close to the fixed rod along the inclined groove.

[0016] The narrow-gauge prestressed concrete sleeper structure has the bottom end of the sliding block protruding from the bottom end of the movable block when the sliding block is away from the fixed rod, and the bottom end of the sliding block is flush with the bottom end of the movable block when the sliding block is close to the fixed rod.

[0017] The narrow-gauge prestressed concrete sleeper structure has the sliding block passively close to the fixed rod based on the stroke of the friction plate close to the movable block, so as to limit the relative positions of the bearing plate, the support and the movable rod when the friction plate is close to the movable block.

[0018] The narrow-gauge prestressed concrete sleeper structure has a wedge-shaped surface formed on the friction plate, and the wedge-shaped surface is used to force the bottom end of the sliding block flush with the bottom end of the movable block to limit the relative positions of the support and the point rail when the friction plate is close to the movable block, and the wedge-shaped friction surface is used to abut against the movable block to limit the relative positions of the support and the bearing plate.

[0019] In the above technical solution, the narrow-gauge prestressed concrete sleeper structure provided by the application can bear the basic rail of the railway through the main body, and can support the point rail through the support on the bearing plate. During the process of changing the point rail, the locking mechanism is switched to the unlocked state first, so that the point rail can drive the support to slide on the bearing plate until the changing of the point rail is completed. Then, the locking mechanism is switched to the locked state to lock and support the point rail, thereby improving the stability of the point rail. BRIEF DESCRIPTION OF DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a support structure provided in another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a sloping groove structure provided in another embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a friction plate structure provided in another embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a locking state structure provided in another embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the first elastic element structure provided in another embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of a movable rod structure provided in another embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of a connecting rod structure provided in another embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of a slide bar structure provided in another embodiment of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Main body; 101. Basic rail; 2. Bearing plate; 3. Support component; 4. Point rail; 5. Fixed rod; 6. Movable rod; 7. Movable block; 8. Friction plate; 9. Wedge-shaped friction surface; 10. Inclined groove; 11. Slider; 12. Wedge-shaped surface; 13. Plane; 14. First elastic element; 15. Connecting end; 16. Extension rod; 17. Connecting rod; 18. Sleeve; 19. Slide rod; 20. Second elastic element. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figures 1-9This invention provides a narrow-gauge prestressed concrete sleeper structure, including a main body 1 made of concrete and used to support the basic rail 101, and a bearing plate 2 embedded in the main body 1. The bearing plate 2 is provided with a support member 3 and a locking mechanism. The support member 3 is slidably connected to the bearing plate 2 and is used to support the switch rail 4. The locking mechanism has a locked state for locking the support member 3 and an unlocked state for releasing the lock. When the switch rail 4 needs to change track, the locking mechanism switches to the unlocked state. After the switch rail 4 changes track, the locking mechanism switches to the locked state.

[0034] Specifically, narrow gauge refers to railway rails with a gauge less than a certain standard. Prestressed concrete refers to the process of tensioning the internal steel bars or wires before pouring concrete to create a certain prestress inside the sleeper after the concrete is poured. During the sleeper laying process, for a single railway track, the sleeper only needs to support the basic rail 101. When encountering a branch line, it is necessary to install switch rails 4, guard rails, and other structures on the sleeper to achieve track changing and change of track operations. This is existing technology and will not be elaborated here. The innovation of this invention lies in the pre-embedding of a bearing plate 2 on the main body 1 (the bearing plate 2 can be pre-embedded directly, or screw holes or other structures can be pre-embedded so that the bearing plate 2 can be installed by bolts after the casting is completed). Then, the support member 3 is slidably set on the bearing plate 2 (the basic rail 101 can also be directly installed on the bearing plate 2, so that the basic rail 101 and the switch rail 4 can be supported and fixed by a bearing plate 2). The support member 3 supports the switch rail 4, and the slidably set support member 3 can adapt to the track change process of the switch rail 4. The bearing plate 2 is also provided with a locking mechanism. The locking mechanism can be an electric clamping structure in the prior art, so as to lock the relative position of the support member 3 and the bearing plate 2 after the switch rail 4 changes track, thereby improving the stability and service life of the switch rail 4.

[0035] In another embodiment of the present invention, a fixed rod 5 is further constructed on the support member 3, and a movable rod 6 is slidably connected to the support member 3. Specifically, in the above embodiment, a snap-fit ​​structure can be provided on the support member 3 to fix the switch rail 4, so as to support the switch rail 4 through the support member 3; in this embodiment, the support member 3 is provided with a fixed rod 5 and a movable rod 6. After the switch rail 4 is placed on the support member 3, controlling the movable rod 6 to move closer to the fixed rod 5 can restrict the relative position of the switch rail 4 and the support member 3; thus, a driving structure can be provided on the support member 3 to drive the movable rod 6 to move on the support member 3, thereby fixing or releasing the switch rail 4, so as to facilitate the replacement or maintenance of the switch rail 4.

[0036] It should be noted that the sleeper structure in this embodiment corresponds to the middle part of the switch rail 4. For the end of the connection between the switch rail 4 and the base rail 101, there is no space to install a fixing rod 5 or other structures on the side of the switch rail 4 near the base rail 101. For the end of the switch rail 4 near the frog, the switch rail 4 is directly fixed to the sleeper structure, with no movement or only a small range of movement, so there is no need to install a support member 3 or other structures. Thus, in the embodiments of the present invention, only the middle part of the switch rail 4 is shown in the drawings, and the two ends of the switch rail 4 are not shown.

[0037] Furthermore, the support plate 2 is provided with a movable groove, and the support member 3 is provided with a movable block 7, which is slidably connected in the movable groove. Specifically, the support plate 2 is arranged along the length direction of the main body 1, the movable groove is constructed along the length direction of the support plate 2, and the movable block 7 is constructed at the bottom of the support member 3. There are two symmetrical movable blocks 7, so that the support member 3 can slide stably on the support plate 2 through the two movable blocks 7. This can reduce the friction between the switch rail 4 and the support plate 2, minimize the wear of the switch rail 4, and maximize the service life of the switch rail 4.

[0038] Furthermore, the locking mechanism includes a friction plate 8 slidably connected in a movable groove, and the friction plate 8 and the movable block 7 are constructed with mutually adapted wedge-shaped friction surfaces 9. When the friction plate 8 is close to the movable block 7 so that the two wedge-shaped friction surfaces 9 are in contact, the locking mechanism is in a locked state; when the friction plate 8 is away from the movable block 7 so that the two wedge-shaped friction surfaces 9 are separated, the locking mechanism is in an unlocked state. Specifically, both the friction plate 8 and the movable block 7 have wedge-shaped friction surfaces 9 on their sides that are close to each other. The friction coefficient of the wedge-shaped friction surfaces 9 is high. When the two are close to each other, the two wedge-shaped friction surfaces 9 press against each other to lock the relative position of the support member 3 and the bearing plate 2. The movable groove has a large space. When the movable block 7 slides in the movable block 7, it only occupies the space above the movable groove. The friction plate 8 is slidably set in the space below the movable groove to avoid the friction plate 8 affecting the sliding of the movable block 7 as much as possible. The length of the support member 3 and the movable block 7 is less than the length of the movable groove, and the length of the friction plate 8 is equal to the length of the movable groove. In this way, a driving structure can be set on the bearing plate 2 to drive the friction plate 8 to slide, so as to control the locking mechanism to be in the locked or unlocked state. The advantage is that no matter where the support member 3 slides with the switch rail 4, the support member 3 can be locked by the friction plate 8.

[0039] In another embodiment of the present invention, the support member 3 is further provided with an inclined groove 10, and a slider 11 is slidably connected within the inclined groove 10. The movable rod 6 is fixed to the slider 11. As the slider 11 moves closer to the fixed rod 5 along the inclined groove 10, the distance between the movable rod 6 and the bearing plate 2 gradually increases. Specifically, the support member 3 is provided with a through groove, the slider 11 is located within the through groove, and the inclined groove 10 is constructed on the inner wall of the through groove. The end of the inclined groove 10 closer to the fixed rod 5 is farther from the main body 1, so that when the movable rod 6 slides with the slider 11, it can move further away from the fixed rod 5 and closer to the main body 1. This increases the space between the fixed rod 5 and the movable rod 6, facilitating the support and restraint of the switch rail 4.

[0040] As an alternative to the aforementioned method of moving the movable rod 6 on the support 3 via a driving structure, preferably, when the slider 11 moves away from the fixed rod 5, its bottom end protrudes beyond the bottom end of the movable block 7; when the slider 11 moves closer to the fixed rod 5, its bottom end is flush with the bottom end of the movable block 7. The slider 11 passively moves closer to the fixed rod 5 based on the stroke of the friction plate 8 as it approaches the movable block 7, thereby restricting the relative positions of the bearing plate 2, the support 3, and the movable rod 6 when the friction plate 8 approaches the movable block 7. Specifically, in this embodiment, when the movable rod 6 slides with the slider 11 to approach the fixed rod 5 and restrict the position of the switch rail 4, the bottom end of the slider 11 is flush with the bottom end of the movable block 7; when the movable rod 6 moves away from the fixed rod 5 to release the restriction on the switch rail 4, the bottom end of the slider 11 protrudes beyond the bottom end of the movable block 7. In this embodiment, an abutment structure can be provided between the slider 11 and the friction plate 8 to drive the slider 11 closer to the fixed rod 5 when the friction plate 8 approaches the movable block 7, thereby simultaneously restricting or releasing the relative positions of the bearing plate 2, the support 3, and the movable rod 6. The advantage of this arrangement is that, in the above embodiment, the movable rod 6 and the fixed rod 5 can restrict the switch rail 4 to the support member 3, and maintain the restriction on the switch rail 4 even when it changes track. However, this presents a problem: during the track change process, the movement trajectory of the switch rail 4 at a certain position is not a straight line but an arc. In other words, if the fixed rod 5 and the movable rod 6 still restrict the switch rail 4 when it changes track, the fixed rod 5 and the movable rod 6 will be affected by the switch rail 4 and tend to deviate from the main body 1. This will affect the accuracy of the movable rod 6 and the fixed rod 5. Therefore, the slider 11 and the friction plate 8... The three components are connected together to lock or unlock the bearing plate 2, support member 3, and movable rod 6 simultaneously. The advantage is that when the bearing plate 2, support member 3, and movable rod 6 are unlocked, the switch rail 4 rests on the support member 3 under the action of gravity. The gap between the movable rod 6 and the fixed rod 5 is greater than the width of the switch rail 4, which can accommodate the switch rail 4's track changing process. In addition, the presence of the movable rod 6 and the fixed rod 5 can also prevent the switch rail 4 from detaching from the support member 3. When the bearing plate 2, support member 3, and movable rod 6 are locked, the three components lock simultaneously to improve the stability of the switch rail 4, thus accommodating the arc-shaped track changing process of the switch rail 4.

[0041] Furthermore, the friction plate 8 is constructed with a wedge-shaped surface 12. When the friction plate 8 approaches the movable block 7, the wedge-shaped surface 12 first forces the bottom end of the slider 11 to be flush with the bottom end of the movable block 7, thereby limiting the relative position of the support member 3 and the tip rail 4. Then, the wedge-shaped friction surface 9 abuts against the movable block 7, thereby limiting the relative position of the support member 3 and the bearing plate 2. Specifically, in this embodiment, a plane 13 is constructed between the wedge-shaped surface 12 and the wedge-shaped friction surface 9. When the friction plate 8 is on the side away from the movable block 7 (e.g., ...), Figure 4 As shown), the wedge-shaped surface 12 is located on the side of the wedge-shaped friction surface 9 closest to the slider 11. During the process of the friction plate 8 approaching the movable block 7, the wedge-shaped surface 12 first contacts the bottom end of the slider 11 to force the bottom end of the slider 11 to be flush with the bottom end of the movable block 7. During this process, the movable rod 6 approaches the tip rail 4. When the movable rod 6 has already contacted the tip rail 4 but the bottom end of the slider 11 is not yet flush with the bottom end of the movable block 7, the wedge-shaped surface 12 continues to contact the slider 11, which can also force the fixed rod 5 to approach the movable rod 6. Until both the movable rod 6 and the fixed rod 5 contact the tip rail 4, the bottom end of the slider 11 and the bottom end of the movable block 7 are flush. The bottom end of the slider 11 moves relative to the plane 13 from the wedge-shaped surface 12. Thus, the plane 13 restricts the relative position of the movable rod 6 and the fixed rod 5, thereby restricting the relative position of the tip rail 4 and the support member 3. Subsequently, the friction plate 8 continues to be controlled to approach the movable block 7 so that the two wedge-shaped friction surfaces 9 press against each other, thereby restricting the relative position of the bearing plate 2 and the support member 3 (e.g., ...). Figure 5 (As shown). The advantage of this arrangement is that, in this embodiment, by controlling the friction plate 8 to approach the movable block 7, the relative positions of the support member 3 and the switch rail 4 can be restricted first, and then the relative positions of the bearing plate 2 and the support member 3 can be restricted, so as to adapt to the process of the switch rail 4 changing track and minimize the impact of the switch rail 4 changing track on the movable rod 6 and the fixed rod 5.

[0042] In the above embodiment, after the friction plate 8 moves away from the movable block 7, the slider 11 can move away from the fixed rod 5 under the action of gravity. Preferably, a first elastic element 14 is provided between the support member 3 and the slider 11 to force the slider 11 away from the fixed rod 5. The first elastic element 14 can be a spring structure in the prior art, with one end fixed to the inner wall of the through groove and the other end fixed to the slider 11 (the two ends of the first elastic element 14 are preferably connected by hinges, which will not be described in detail), so that after the friction plate 8 moves away from the movable block 7, the movable rod 6 is forced away from the fixed rod 5 by the first elastic element 14.

[0043] In another embodiment of the present invention, the bearing plate 2 has connecting ends 15 on both opposite sides, and the friction plate 8 has extension rods 16 on both opposite sides. The two extension rods 16 are respectively inserted into the two connecting ends 15. A connecting rod 17 is provided between two adjacent main bodies 1. A sleeve 18 is screwed to the end of the connecting rod 17, and the sleeve 18 is adapted to the connecting end 15 (screwed adaptation). A sliding rod 19 is slidably connected inside the connecting rod 17. When a friction plate 8 is driven to approach the corresponding movable block 7, the extension rod 16 and the sliding rod 19 abut against each other and drive the friction plates 8 in multiple bearing plates 2 to move synchronously, thereby synchronously switching the states of multiple support members 3. Specifically, in this embodiment, a connecting rod 17 is provided between two adjacent bearing plates 2. The connecting rod 17 can improve the connectivity between two adjacent main bodies 1 or bearing plates 2. At the same time, the connecting rod 17 can also control the spacing, minimizing the possibility of excessively large or small spacing between two adjacent main bodies 1, and minimizing impact on the track changing process of the switch rail 4. Both the connecting end 15 and the connecting rod 17 are constructed as hollow cylindrical structures. They have the same outer diameter and their ends are fitted to the sleeve 18 (screw-fitted). When the connecting end 15 and the connecting rod 17 are aligned, rotating the sleeve 18 allows it to be screwed onto both the connecting end 15 and the connecting rod 17 simultaneously, thus connecting two adjacent main bodies 1 together (e.g., ...). Figure 8 (As shown). The connecting rod 17 has a movable cavity, and two second elastic elements 20 are symmetrically arranged inside the movable cavity. The second elastic elements 20 can be spring structures from the prior art. Both second elastic elements 20 are sleeved on the slide rod 19. One end of the second elastic element 20 is fixed to the inner wall of the movable cavity, and the other end is fixed to the outer wall of the slide rod 19 (fixed to the protruding structure on the outer wall of the slide rod 19), so that the slide rod 19 is forced to be inside the connecting rod 17 by the two second elastic elements 20, and the end does not protrude from the end of the connecting rod 17 (second elastic elements). Alternatively, only one 20 can be provided, so that the protruding structure on the outer wall of the slide rod 19 abuts against the inner wall of the movable cavity, at which point the two ends of the slide rod 19 are aligned with the two ends of the connecting rod 17; this arrangement allows multiple bearing plates 2 to be connected together by multiple connecting rods 17, so that the multiple friction plates 8 within the multiple bearing plates 2 form a whole, that is, a drive mechanism is provided on one of the main bodies 1 at the edge to drive the extension rod 16 to move within the connecting end 15, which can simultaneously drive the multiple friction plates 8, the extension rod 16, and the slide rod 19 to move (e.g. Figure 8In the middle, a drive mechanism can be set on the lower main body 1 to drive the extension rod 16 in the lower connecting end 15 to move, thereby simultaneously switching multiple locking mechanisms to the locked state. Conversely, the drive mechanism can drive the extension rod 16 to reset in the connecting end 15 to switch multiple locking mechanisms to the unlocked state, so that multiple movable rods 6 can release the restriction on the switch rail 4 under the action of the first elastic member 14, and so that multiple slide rods 19 can reset under the action of the second elastic member 20 (at this time, the end of the extension rod 16 is aligned with the end of the connecting end 15, and the end of the slide rod 19 is aligned with the end of the connecting rod 17, which makes it easy to directly remove the connecting rod 17).

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A narrow-gauge prestressed concrete sleeper structure, comprising a concrete main body for supporting the main rail and a bearing plate embedded in the main body, characterized in that, The support plate is provided with: A support component that is slidably connected to a load-bearing plate and is used to support a switch rail; The locking mechanism has a locked state for locking the support member and an unlocked state for releasing the lock. When the switch rail needs to change track, the locking mechanism switches to the unlocked state, and after the switch rail changes track, the locking mechanism switches to the locked state. The support member has a fixed rod and a movable rod slidably connected to it. The bearing plate is provided with a movable groove, and the support member is provided with a movable block, which is slidably connected in the movable groove. The locking mechanism includes a friction plate slidably connected in a movable groove, and the friction plate and the movable block are constructed with mutually adapted wedge-shaped friction surfaces. When the friction plate approaches the movable block to make the two wedge-shaped friction surfaces fit together, the locking mechanism is in a locked state; when the friction plate moves away from the movable block to make the two wedge-shaped friction surfaces separate, the locking mechanism is in an unlocked state.

2. The narrow-gauge prestressed concrete sleeper structure according to claim 1, characterized in that, The support member has an inclined groove, and a slider is slidably connected in the inclined groove. The movable rod is fixed on the slider.

3. The narrow-gauge prestressed concrete sleeper structure according to claim 2, characterized in that, As the slider approaches the fixed rod along the inclined groove, the distance between the movable rod and the bearing plate gradually increases.

4. A narrow-gauge prestressed concrete sleeper structure according to claim 2, characterized in that, When the slider moves away from the fixed rod, its bottom end protrudes beyond the bottom end of the movable block; when the slider moves closer to the fixed rod, its bottom end is flush with the bottom end of the movable block.

5. A narrow-gauge prestressed concrete sleeper structure according to claim 4, characterized in that, The slider passively approaches the fixed rod based on the travel of the friction plate near the movable block, thereby limiting the relative positions of the bearing plate, support member, and movable rod when the friction plate approaches the movable block.

6. A narrow-gauge prestressed concrete sleeper structure according to claim 5, characterized in that, The friction plate is constructed with a wedge-shaped surface. When the friction plate approaches the movable block, the bottom end of the slider and the bottom end of the movable block are first forced to be flush through the wedge-shaped surface to limit the relative position of the support and the switch rail. Then, the wedge-shaped friction surface abuts against the movable block to limit the relative position of the support and the bearing plate.

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