Track fastening assembly

Abstract

The invention relates to a rail fastening assembly in the technical field of rail traffic, and the rail fastening assembly comprises a pressing plate, the pressing plate comprises a base connecting part and a pressing tongue mounting part, and the pressing tongue mounting part is integrally formed on the side face of the base connecting part; the pressing tongue is an elastic structure body and comprises a sleeving part and a pressing part, the sleeving part comprises a containing cavity, the pressing tongue mounting part is sleeved with the sleeving part through the containing cavity, the sleeving part is in tight pressing contact with the pressing tongue mounting part, and the pressing part is integrally formed on the lower surface of the sleeving part and used for being in pressing connection with a rail; and the base connecting part is located and connected to the base. The pressing tongue and the pressing plate are of a sleeved connection structure, the structure is simple, maintenance is convenient and fast, the problems of tedious technology, local corrosion, complex pressing tongue replacement and the like caused by a glue joint technology are fundamentally solved, overall stress is uniform, and the service life is long. The problems that metal connecting pieces need to be embedded in rubber blocks due to bolt connection, and the rubber blocks are prone to damage due to uneven stress are solved, and the rail fastening effect is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of rail transit technology, and more specifically, to a rail fastening assembly. Background Technology

[0002] Rail fasteners are widely used in railway and urban rail systems. One of their core functional components is the pressure plate assembly with an elastic pressure tongue, used to clamp the rail and provide frictional resistance. The traditional technical solution commonly used in the industry is the "vulcanized rubber pressure tongue - adhesive fixing" method. The specific implementation of this method is as follows: First, natural or synthetic rubber is molded into pressure tongues with a specific cross-sectional shape through a high-temperature vulcanization process, giving it the necessary elasticity, damping, and wear resistance. The upper pressure plate, as the load-bearing component, undergoes overall hot-dip galvanizing or electro-galvanizing treatment to achieve long-term corrosion protection. Subsequently, to address the problem of insufficient adhesion between the rubber and the smooth galvanized metal surface, the zinc layer is locally removed from the pre-designated pressure tongue installation area on the upper pressure plate using laser etching, grinding, or chemical methods to expose the metal substrate, forming a roughened bonding surface. Finally, a high-strength, high-elasticity specialized polyurethane or epoxy structural adhesive is used to permanently adhere the vulcanized rubber pressure tongue to this area, which then cures to form a unified whole.

[0003] This technical solution, after years of development, offers the advantage of providing a stable and reliable coefficient of friction and cushioning effect through vulcanized rubber pressure tongues, while the overall structure meets basic fastening requirements in its initial state. However, as rail transit evolves towards higher speeds, larger capacities, and lower maintenance costs, the inherent limitations of this traditional technical approach are becoming increasingly apparent. Particularly in terms of the fixing method, its complete reliance on the reliability of chemical bonding has become a key bottleneck restricting overall product performance, production costs, and maintenance efficiency. Aging, contamination, or stress concentration at any adhesive interface can lead to pressure tongue detachment, posing safety hazards. Furthermore, the multiple auxiliary processes required to achieve reliable bonding directly increase manufacturing costs and introduce secondary problems related to environmental protection and corrosion prevention.

[0004] Therefore, exploring a new solution for fixing the pressure tongue that does not rely on chemical adhesives, has a simpler structure, and is easier to maintain has become an important direction for technological upgrading in this field. For example, CN213708988U discloses a rigid-flexible track fixing connection device, including a base plate, a top cover plate, a fixing nut, and a washer. The base plate is fixed to a screw rod, and the front end of the top cover plate is provided with a pressure tongue. The pressure tongue has a pre-drilled vertical bolt hole. An adjustable screw rod passes through the vertical bolt hole of the pressure tongue and presses against the track to pre-tighten and fix the track. The lower end of the adjustable screw rod is a steel block, and the upper end is a nut to adjust the height of the lower end of the screw rod. The top cover plate is provided with an elongated hole, and a T-bolt passes through the fixing hole of the base plate. The T-bolt slides into the slot. The upper part is the top cover plate, and a flat washer, a spring washer, and a nut are placed in sequence. Although this technical solution uses bolted connections instead of adhesive bonding, directly connecting the rubber material pressure tongue with bolts requires, on the one hand, the need to pre-embed metal connectors in the pressure tongue, which also makes the process cumbersome; on the other hand, simply using bolted connections is prone to problems such as detachment and breakage due to insufficient structural strength and uneven stress, leading to fastener failure. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide a track fastening assembly.

[0006] A track fastening assembly according to the present invention includes: A pressure plate, comprising a base connecting part and a pressure tongue mounting part, wherein the pressure tongue mounting part is integrally formed on the side of the base connecting part; The pressure tongue is an elastic structure, including a sleeve part and a pressing part. The sleeve part has a receiving cavity. The sleeve part is sleeved on the pressure tongue mounting part through the receiving cavity. The sleeve part and the pressure tongue mounting part are in tight contact. The pressing part is integrally formed on the lower surface of the sleeve part. The pressing part is used to press with the track. A base, wherein the base connecting part is seated and connected to the base.

[0007] In some embodiments, the sleeve is a C-shaped structure with an opening on one side or a cylindrical structure with openings at both ends.

[0008] In some embodiments, the lower surface of the tongue mounting portion is provided with a locking protrusion, the pressing portion is provided with a locking groove, the locking groove is connected to the receiving cavity, the locking groove is adapted to the locking protrusion, and the locking protrusion is engaged in the locking groove.

[0009] In some embodiments, the latching protrusion includes a first latching block having a forward-inclined surface that gradually rises from the front end of the tongue mounting portion toward the rear end connected to the base connecting portion.

[0010] In some embodiments, the card protrusion further includes a second card block, which is spaced apart from the first card block.

[0011] In some embodiments, the portion of the slot used to accommodate the first card block protrudes outward to form a first arcuate convex surface, and the portion of the slot used to accommodate the second card block protrudes outward to form a second arcuate convex surface, wherein the surface height of the first arcuate convex surface is lower than the surface height of the second arcuate convex surface.

[0012] In some embodiments, there are multiple latching protrusions on the tongue mounting portion, and the multiple latching protrusions are spaced apart.

[0013] In some embodiments, the base connecting part is provided with bolt mounting holes, the bolt mounting holes are racetrack-shaped, one end of the bolt mounting holes is the bolt entry end, the pressure tongue mounting part and the spiral mounting hole are arranged in a V shape, and the bolt entry end is located close to the pressure tongue mounting part.

[0014] In some embodiments, the upper surface of the tongue depressor mounting portion is higher than the upper surface of the base connecting portion, and a guide portion with gradually thinning thickness extends from the rear end of the tongue depressor mounting portion to the upper surface of the base connecting portion.

[0015] In some embodiments, the guide portion has a triangular structure, the bolt mounting hole is disposed opposite to the inclined surface of the guide portion, and the two corner ends of the guide portion are respectively close to the two ends of the bolt mounting hole.

[0016] In some embodiments, the outer side of the guide portion is provided with reinforcing ribs, and the angle between the upper surface of the reinforcing ribs and the upper surface of the base connection portion is 30-45°.

[0017] In some embodiments, the pressure tongue is made of EVA or rubber.

[0018] In some embodiments, a first sliding groove is provided on the lower surface of the base connecting part in a direction parallel to the bolt mounting hole. The first sliding groove communicates with the bolt mounting hole. The base is provided with a bolt mounting groove, which is horizontally U-shaped. After the pressure plate connecting part is seated and connected to the base, part or all of the main body of the base is confined within the first sliding groove. The part of the main body of the base confined within the first sliding groove is referred to as the interlocking part. The bolt mounting hole and the bolt mounting groove are intersecting in an X-shape.

[0019] In some embodiments, the depth of the first groove gradually thins from the bolt entry end toward the other end of the bolt mounting hole to form a wedge-shaped groove, and the thickness of the interlocking part gradually thins from one end to the other to form a wedge-shaped structure. The first groove and the interlocking part are engaged with their thin ends located at both ends.

[0020] In some embodiments, the base is provided with a second sliding groove, which is parallel to the first sliding groove. After the pressure plate connecting part is seated and connected to the base, the outer wall of the base connecting part is confined within the second sliding groove.

[0021] In some embodiments, the thickness of the outer wall gradually thins from the bolt entry end toward the other end of the bolt mounting hole to form a wedge-shaped block, and the depth of the second groove gradually shallows from one end to the other to form a wedge-shaped groove, and the outer wall and the second groove are engaged with the thin ends located at both ends respectively.

[0022] In some embodiments, fasteners are also included, comprising a bolt and a nut, wherein one end of the bolt passes sequentially through the bolt mounting hole and the bolt mounting groove, and then connects the pressure plate to the base by means of the connection with the nut.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. The track fastening assembly provided in this embodiment adopts a sleeve structure for the pressure tongue and pressure plate, which is simple in structure and convenient in maintenance. It fundamentally solves the problems of complicated process, local corrosion and complicated pressure tongue replacement caused by the adhesive bonding process. Moreover, the overall force is uniform, avoiding the problems of needing to embed metal connectors in the rubber block and uneven force that are easily damaged caused by bolt connection, effectively improving the fastening effect of the track.

[0024] 2. The track fastening assembly provided in this embodiment has a mechanical interlocking structure in which a locking protrusion is formed on the pressure plate and a matching locking groove is formed on the pressure tongue. This not only improves the connection strength between the pressure plate and the pressure tongue, but also forms a structure in which the pressing part is embedded with a rigid support member. This can effectively improve the overall structural strength and rigidity of the pressing part. It has advantages such as controlling the deformation range and guiding the direction of force transmission. In addition, the rigidity can be adjusted according to the vibration characteristics of the track to optimize the dynamic characteristics.

[0025] 3. The track fastening assembly provided in this embodiment optimizes the latch protrusion into a structure similar to the outline of a high heel by setting two latch blocks with front and rear intervals, thereby further improving the connection strength between the pressure tongue and the pressure plate, as well as the structural strength and rigidity of the pressing part, and enhancing the fastening effect on the track.

[0026] 4. The track fastening assembly provided in this embodiment optimizes the pressing part of the pressure tongue into a wave-shaped shape, and the arc-shaped convex surface near the pressure plate connection part is relatively high, forming a dual damping fastening surface that combines rigidity and flexibility. This allows the pressure plate assembly to quickly attenuate and transmit high-frequency amplitude, and also to effectively absorb low-frequency amplitude. This can effectively reduce fatigue damage caused by vibration, reduce maintenance costs, and improve the clamping effect of the pressure plate assembly on the track.

[0027] 5. The track fastening assembly provided in this embodiment improves the overall structural strength of the pressure plate by optimizing the structural design of the pressure plate, enhances the absorption and transmission of vibration force, and reduces the adverse effects of vibration force on fasteners, such as loosening.

[0028] 6. The track fastening assembly provided in this embodiment optimizes the connection structure between the pressure plate and the base into a limiting structure, thereby reducing the relative displacement between the pressure plate and the base caused by vibration and improving the fastening effect on the track.

[0029] 7. The track fastening assembly provided in this embodiment optimizes the contact surface between the pressure plate and the base into a wedge-shaped structure surface. By improving the alignment between the surfaces, it further offsets and reduces the adverse effects of vibration on the pressure plate displacement, ensuring the clamping effect on the track. Attached Figure Description

[0030] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the front of the track fastening assembly of the present invention; Figure 2 This is a three-dimensional structural diagram of the reverse side of the track fastening assembly of the present invention; Figure 3 This is a schematic diagram of the connection structure between the pressure plate and the pressure tongue of the present invention; Figure 4 This is a schematic diagram of the connection structure between the pressure plate and the pressure tongue of the present invention from another direction; Figure 5 This is a three-dimensional structural diagram of the front of the pressure plate of the present invention; Figure 6 This is a schematic diagram of the three-dimensional structure of the reverse side of the pressure plate of the present invention; Figure 7 This is a three-dimensional structural diagram of the tongue depressor of the present invention. Figure 8 This is a schematic diagram of the three-dimensional structure of the reverse side of the tongue depressor of the present invention; Figure 9 This is a schematic diagram of the structure of the base of the present invention; Figure 10 This is a schematic diagram of another embodiment of the track fastening assembly of the present invention; Figure 11 This is a schematic diagram of the wedge-shaped structure on the base of the present invention; Figure 12 This is a schematic diagram of the wedge-shaped structure on the pressure plate of the present invention. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0032] Example 1 This embodiment provides a track fastening assembly, such as Figure 1-4 As shown, it mainly consists of a pressure plate 1 and a pressure tongue 2. The pressure plate 1 is a one-piece metal plate structure, which includes a base connecting part 11 for connecting with the base and a pressure tongue mounting part 12 for pressing with the rail. Both the base connecting part 11 and the pressure tongue mounting part 12 are block structures, and the pressure tongue mounting part 12 is integrally formed on the side of the base connecting part 11.

[0033] The pressure tongue 2 is an elastic structure formed from an elastic material, such as EVA or rubber. The pressure tongue 2 mainly includes a sleeve portion 21 and a pressing portion 22. The sleeve portion 21 has a receiving cavity 211, which is used to fit into the pressure tongue mounting portion 12. The volume of the receiving cavity 211 is smaller than the volume of the portion of the pressure tongue mounting portion 12 that is fitted, so that after the sleeve portion 21 is fitted onto the pressure tongue mounting portion 12 through the receiving cavity 211, the pressure tongue 2 is tightly connected to the pressure tongue mounting portion 12 by its own elasticity. The structure of the sleeve portion 21 can be a C-shaped structure with an opening on one side, or a cylindrical structure with openings at both ends. This embodiment uses a C-shaped structure of the sleeve portion 21 as an example, essentially wrapping around the end of the pressure tongue mounting portion 12. The pressing portion 22 is integrally formed on the lower surface of the sleeve portion 21, and the lower surface of the pressing portion 22 is used for tight contact with the track.

[0034] The base 3 serves as a structural component for mounting the pressure plate 1. After the pressure plate 1 is connected to the base 3, the base 3 is securely connected to the foundation or other structural components, so that the pressing part 22 of the pressure tongue 2, which is sleeved on the pressure tongue connecting part 12, is pressed into contact with the track.

[0035] The track fastening assembly provided in this embodiment adopts a sleeve structure for the pressure tongue and pressure plate, which is simple in structure and convenient in maintenance. It fundamentally solves the problems of complicated process, local corrosion and complicated pressure tongue replacement caused by the adhesive bonding process. Moreover, the overall force is uniform, avoiding the problems caused by bolt connection, such as the need to embed metal connectors in the rubber block and uneven force that is easy to damage. It effectively improves the fastening effect of the track.

[0036] Example 2 This embodiment 2 is formed based on embodiment 1. By forming a locking protrusion on the pressure plate and a matching locking groove on the pressure tongue, a mechanical interlocking structure is created. This not only improves the connection strength between the pressure plate and the pressure tongue but also forms a structure where the pressing part is embedded with a rigid support member. This effectively improves the overall structural strength and rigidity of the pressing part, and has advantages such as controlling the deformation range and guiding the direction of force transmission. The rigidity can be adjusted according to the vibration characteristics of the track, optimizing dynamic characteristics. Specifically: like Figure 4-8 As shown, a latching protrusion 121 is formed on the lower surface of the plate of the tongue mounting part 12, and the latching protrusion 121 includes a first latching block 1211. The first latching block 1211 is preferably a wedge-shaped or right-angled trapezoidal structure with a forward-inclined surface 12110. The forward-inclined surface 12110 refers to an inclined surface that gradually rises from the front end of the tongue mounting part 12 toward the rear end where the tongue mounting part 12 connects to the base connecting part 11. This forward-inclined surface 12110 allows the tongue 2 to be smoothly engaged with the tongue mounting part 12, reducing physical damage to the elastic material of the tongue 2. Correspondingly, a latching groove 221 is formed in the pressing part 22, and the latching groove 221 is connected to the receiving cavity 211. The number, shape, and position of the latching groove 221 are adapted to the number, shape, and position of the latching protrusions 121 on the tongue mounting part 12. After the pressure tongue mounting part 12 is sleeved onto the pressure tongue 2, the first locking block 1211 is correspondingly locked into the locking groove 221. In this embodiment, through the locking engagement of the locking protrusion and the locking groove, mechanical interlocking can be achieved on the basis of the sleeve connection between the pressure plate and the pressure tongue, ensuring the strength of the connection structure and preventing the pressure tongue from shifting due to vibration, which could lead to pressing failure. At the same time, the locking protrusion of the rigid support body embedded in the locking groove is equivalent to the metal skeleton of the pressing part, which improves the structural strength and rigidity of the pressing part. Under vibration and pressure, the rigid support can not only effectively prevent the pressing part from tearing or failing due to excessive deformation, but also transmit most of the vibration force, guiding the vibration force to be transmitted and absorbed in a direction that is basically perpendicular to the pressure plate, avoiding off-center loading or torsion under complex stress.

[0037] The number of latch protrusions 121 on the lower surface of the plate of the tongue mounting part 12 is at least one. For example... Figure 3 As shown, in this embodiment, there are multiple protrusions 121 arranged side by side with intervals. When multiple protrusions 121 are arranged side by side, their number and spacing can be adjusted according to the vibration characteristics of the track. For example, the more protrusions 121 there are and the smaller the spacing, the higher the overall stiffness of the pressing part, which is suitable for high-frequency, small-amplitude vibration. Conversely, the stiffness is low and the flexibility is better, which is suitable for low-frequency, large-displacement environments. This allows for adjustment of the overall system stiffness, balancing the needs of soft vibration damping and structural stability.

[0038] Example 3 This embodiment 3 is formed based on embodiment 2. By optimizing the latch protrusion into a structure of two latch blocks spaced back and forth, forming a structure similar to the outline of a high heel, the connection strength between the pressure tongue and the pressure plate, as well as the structural strength and rigidity of the pressing part, are further improved, thus enhancing the fastening effect on the track. Specifically: like Figure 5 As shown, the latch 121 also includes a second latching block 1212, which is spaced apart from the first latching block 1211. The term "spaced apart" refers to its arrangement along the front end of the latch mounting portion 12 towards the rear end where the latch mounting portion 12 connects to the base connection portion 11. Figure 6 As shown, the second locking block 1212 preferably has a wedge-shaped structure, while the first locking block 1211 is approximately a right-angled trapezoid. The inclined surface of the second locking block 1212 is adjacent to the right-angled surface of the first locking block 1211. The height of the second locking block 1212 is not lower than the height of the first locking block 1211 to improve the connection strength between the pressure tongue and the pressure tongue connection part. At this time, the locking groove 221 is also a structure groove with two intervals, which are adapted to the first locking block 1211 and the second locking block 1212 respectively. In this structure, the second locking block, as the heel part, can form a reliable locking hook, and the first locking block, as the sole part, forms a locking structure while forming a gentle guide slope. The cooperation of the two can further improve the connection strength between the pressure tongue and the pressure plate, as well as the structural strength and rigidity of the pressing part.

[0039] Example 4 This embodiment is based on embodiment 3, optimizing the pressing surface of the pressure tongue into a wave-like shape, and increasing the height of the arc-shaped convex surface near the base connection. This creates a dual-damping and fastening surface that combines rigidity and flexibility, allowing the pressure plate assembly to quickly attenuate and transmit high-frequency amplitudes while effectively absorbing low-frequency amplitudes. This effectively reduces fatigue damage caused by vibration, lowers maintenance costs, and improves the pressure plate assembly's clamping effect on the track. Specifically: like Figure 6-7 As shown, the portion of the slot 221 used to accommodate the first card block 1211 protrudes outward to form a first arc-shaped convex surface 2211, which is a strip-shaped arc-shaped surface formed along the left and right sides of the pressure tongue mounting portion 12. The portion of the slot 221 used to accommodate the second card block 1212 protrudes outward to form a second arc-shaped convex surface 2212, which is arranged parallel to the first arc-shaped convex surface 2211 at intervals. The surface height of the first arc-shaped convex surface 2211 is lower than the surface height of the second arc-shaped convex surface 2212, and the two arc-shaped convex surfaces are connected by an arc-shaped concave surface.

[0040] When the pressing part 22 is in tight contact with the track, the second arc-shaped convex surface 2212 is compressed to a greater extent after contact with the track. Both the second locking block 1212 and the compressed second arc-shaped convex surface 2212 have high rigidity and are close to the base connection part 11, enabling them to quickly absorb and transmit vibration force, and significantly attenuate high-frequency, small-amplitude vibration force. However, the first arc-shaped convex surface 2211, after contacting the track, is compressed to a relatively smaller extent because its surface is lower than the second arc-shaped convex surface 2212. This results in relatively lower rigidity for both the first locking block 1211 and the compressed first arc-shaped convex surface 2211. Compared to the second locking block 1212 and the compressed second arc-shaped convex surface 2212, its flexibility significantly enhances the absorption of low-frequency, high-energy vibrations.

[0041] Example 5 This embodiment 5 is formed based on any one of embodiments 1-4. By optimizing the structural design of the pressure plate, the overall structural strength of the pressure plate is improved, the absorption and transmission effect of vibration force is enhanced, and the adverse effects of vibration force on fasteners, such as loosening, are reduced. Specifically: like Figure 1-8 As shown, the main body of the base connecting part 11 is provided with bolt mounting holes 111. The bolt mounting holes 111 have a racetrack-shaped structure, meaning that the two ends are semi-circular holes and the middle is a rectangular hole. One end of the bolt mounting hole 111 is designated as the bolt entry end 1111. The rectangular pressure tongue mounting part 12 and the bolt mounting hole 111 are arranged in a V-shape, with the bolt entry end 1111 positioned close to the pressure tongue mounting part 12. By changing the parallel position relationship between the bolt hole and the pressure tongue part to an angled V-shape, and with the bolt entry end close to the pressure tongue part of the pressure plate, the connection position of the bolt used to fasten the pressure plate to the base will be at a predetermined distance from the bolt entry end to the other end, such as the middle or near the root. At this time, the distance between the fastening bolt and the pressure tongue mounting part 12 will be increased by the V-shape, thereby increasing the path of vibration force to the fastening bolt, thus reducing the adverse effect of vibration force on the loosening of the fastener and improving the fastening effect.

[0042] In some embodiments, the upper surface of the pressure tongue mounting portion 12 is higher than the upper surface of the base connecting portion 11, and a guide portion 122 with progressively thinner thickness extends from the rear end of the pressure tongue mounting portion 12 toward the upper surface of the base connecting portion 11. The guide portion 122 not only improves the overall structural strength of the pressure plate 1, but also guides the absorbed vibration force. Furthermore, the guide portion 122 has a triangular structure, and in this embodiment, the guide portion 122 is a right-angled triangle. The guide portion 122 is arranged such that its inclined surface is opposite to the bolt mounting hole 111, i.e., refer to the attached figure. Figure 5As shown, the inclined surface of the guide portion 122 is substantially parallel to the bolt mounting hole 111, and the two corner ends of the guide portion 122 are located near both ends of the bolt mounting hole 111. This structural design allows the guide portion 122 to transmit vibrational force to the outer side of the other end of the bolt mounting hole 111, reducing the vibrational force at the bolt fastening connection in the middle of the bolt mounting hole 111, and further reducing the loosening effect of vibration-induced fasteners.

[0043] Furthermore, a reinforcing rib 1221 is provided on the outer side of the guide portion 122. The reinforcing rib 1221 is used to further improve the connection strength between the pressure tongue mounting portion 12 and the base connecting portion 11, and enhance the structural stability of the pressure plate 1. Preferably, the angle between the upper surface 12210 of the reinforcing rib 1221 and the upper surface of the base connecting portion 11 is 30 to 45°, preferably 45°.

[0044] Example 6 This embodiment is formed based on any one of embodiments 1-5. By optimizing the connection structure between the pressure plate and the base into a limiting structure, the relative displacement between the pressure plate and the base caused by vibration is reduced, thereby improving the fastening effect on the track. Specifically: like Figure 1-9 As shown, a first groove 112 is provided on the lower surface of the base connecting part 11. The first groove 112 is an open structure at both ends. The first groove 112 and the bolt mounting hole 111 are arranged parallel to each other and are connected. The bolt mounting hole 111 is located between the two arms of the first groove 112. Preferably, the bolt mounting hole 111 is close to the outer arm 113 of the first groove 112. Here, the outer wall refers to the side away from the pressure tongue mounting part 12. The base 3 is provided with a bolt mounting groove 31, which is a horizontal U-shaped groove extending from one side of the base 3 to the other side and connecting the upper and lower surfaces. After the base connecting part 11 is placed on the base 3, part or all of the main body of the base 3 is confined within the first groove 112. Here, the main body of the base 3 refers to the structure extending from the lower surface of the base 3 to the upper surface. The main body of the base 3 that engages with the first groove 112 is called the interlocking part 33. At the same time, the bolt mounting hole 111 and the bolt mounting groove 31 are arranged vertically and intersect to form an X-shaped structure. In this embodiment, the pressure plate 1 and the base 3 are fastened together by fasteners 4, which mainly include bolts 41 and nuts 42. After the fastening bolts 41 pass through the bolt mounting holes 111 and bolt mounting grooves 31 to fasten the pressure plate 1 to the base 3, the limiting fit between the first sliding groove 112 and the interlocking part 33, as well as the cross arrangement of the bolt mounting grooves 31 and the bolt mounting holes 111, will form an X-shaped restriction on the bolts 41, reducing the risk of displacement and loosening of the fasteners due to vibration.

[0045] Furthermore, a second groove 32 is formed near the outer side of the base 3, and the second groove 32 is arranged parallel to the first groove 112. After the pressure plate connecting part 11 is connected to the base 3, the outer side wall 113 is confined within the second groove 32, and the fitting part 33 located inside the second groove 32 is confined within the first groove 112, further improving the fastening effect after the base 3 and the pressure plate 1 are connected.

[0046] Example 7 This embodiment 7 is formed based on embodiment 6, optimizing the contact surface between the pressure plate and the base into a wedge-shaped structure. By improving the alignment between the surfaces, it further offsets and reduces the adverse effects of vibration on the pressure plate's displacement, ensuring a tighter clamping effect on the track. Specifically: like Figure 10-12 As shown, the first groove 112 is a wedge-shaped groove structure whose thickness gradually decreases from the bolt entry end 1111 to the other end of the bolt mounting hole 111 opposite to the bolt entry end 1111. Correspondingly, the fitting part 33 is a wedge-shaped block structure whose thickness gradually decreases from one end to the other. When the base connecting part 11 is connected to the base 3, the fitting part 33 is engaged in the first groove 112. At this time, the thin end 33a of the fitting part 33 is located on the side of the thick end 112b of the first groove 112, and the thin end 112a of the first groove 112 is located on the side of the thick end 33b of the fitting part 33. Here, the thin end and the thick end of the fitting part 33 are named according to their thickness, and similarly, the thin end and the thick end of the first groove 112 are also named according to their thickness.

[0047] Furthermore, the outer wall 113 is a wedge-shaped block structure whose thickness gradually decreases from the bolt entry end 1111 towards the bolt mounting hole 111 opposite to the bolt entry end 1111. Correspondingly, the second groove 32 is a wedge-shaped groove whose depth gradually decreases from one end to the other. When the outer wall 113 is engaged in the second groove 32, the thick end 113b of the outer wall 113 is located on the side of the thin end 32a of the second groove 32, and the thin end 113a of the outer wall 113 is located on the side of the thick end 32b of the first groove 32. As mentioned above, the names of the thin end and the thick end are also based on the thickness of the two ends.

[0048] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0049] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A rail fastening assembly characterised in that, The utility model relates to a tongue depressor, which comprises a base connecting part (11) and a tongue depressor mounting part (12) integrally formed on the side of the base connecting part (11); a tongue depressor (2) with an elastic structure, which comprises a sleeve part (21) and a pressing part (22), the sleeve part (21) is provided with a receiving cavity (211), the sleeve part (21) is sleeved on the tongue depressor mounting part (12) through the receiving cavity (211), the sleeve part (21) is in close contact with the tongue depressor mounting part (12), and the pressing part (22) is integrally formed on the lower surface of the sleeve part (21) and is used for pressing the rail; and a base (3), wherein the base connecting part (11) is connected to the base (3). The sleeve part (21) is a C-shaped structure with one side opening or a cylindrical structure with both ends opening. The lower surface of the tongue depressor mounting part (12) is provided with a clamping protrusion (121), the pressing part (22) is provided with a clamping groove (221) therein, the clamping groove (221) is in communication with the receiving cavity (211), the clamping groove (221) is adapted to the clamping protrusion (121), and the clamping protrusion (121) is clamped in the clamping groove (221). The clamping protrusion (121) comprises a first clamping block (1211), and the first clamping block (1211) has a front inclined surface (12110) gradually rising from the front end of the tongue depressor mounting part (12) to the rear end connected to the base connecting part (11).

2. The rail fastening assembly of claim 1, wherein, The clamping protrusion (121) further comprises a second clamping block (1212), and the second clamping block (1212) is arranged in front of and behind the first clamping block (1211) in an interval manner.

3. The rail fastening assembly of claim 1, wherein, The clamping groove (221) is used for accommodating the first clamping block (1211) to form a first arc-shaped convex surface (2211) outwardly protruding, the clamping groove (221) is used for accommodating the second clamping block (1211) to form a second arc-shaped convex surface (223) outwardly protruding, and the surface height of the first arc-shaped convex surface (2211) is lower than that of the second arc-shaped convex surface (2212).

4. The rail fastening assembly of claim 3, wherein, The clamping protrusion (121) on the tongue depressor mounting part (12) is a plurality of clamping protrusions (121) arranged in an interval manner.

5. The rail fastening assembly of claim 4, wherein, The base connecting part (11) is provided with a bolt mounting hole (111), the bolt mounting hole (111) is a runway type, one end of the bolt mounting hole (111) is a bolt entering end (1111), the tongue depressor mounting part (12) is arranged in a V shape with the bolt mounting hole (111), and the bolt entering end (1111) is arranged close to the tongue depressor mounting part (12).

6. The rail fastening assembly of claim 5, wherein, The upper surface of the tongue depressor mounting part (12) is higher than the upper surface of the base connecting part (11), and a guide part (122) with gradually thinned thickness is formed by extending from the rear end of the tongue depressor mounting part (12) to the upper surface of the base connecting part (11).

7. The rail fastening assembly of claim 1, wherein, ​ 8. The rail fastening assembly of any of claims 1-7, wherein, ​ 9. The rail fastening assembly of claim 8, wherein, ​ 10. The rail fastening assembly defined in claim 9, wherein, The guide part (122) is triangular in shape, the bolt mounting hole (111) is arranged opposite to the inclined surface of the guide part (122), and the two corner ends of the guide part (122) are respectively close to the two ends of the bolt mounting hole (111).

11. The rail fastening assembly defined in claim 10, wherein The outer side surface of the guide part (122) is provided with a reinforcing rib (1221), and the included angle between the upper surface (12210) of the reinforcing rib (1221) and the upper surface of the base connecting part (11) is 30-45°.

12. The rail fastening assembly defined in claim 1, wherein The tongue depressor (2) is made of EVA material or rubber material.

13. A rail fastening assembly according to any one of claims 9 to 12, wherein, A first sliding groove (112) is arranged through the lower surface of the base connecting part (11) in a direction parallel to the bolt mounting hole (111), the first sliding groove (112) is communicated with the bolt mounting hole (111), the base (3) is provided with a bolt mounting groove (31), the bolt mounting groove (31) is horizontally U-shaped, after the base plate connecting part (11) is connected to the base (3), part or all of the main body of the base (3) is limited in the first sliding groove (112), the part of the main body of the base (3) limited in the first sliding groove (112) is called an embedded part (33), and the bolt mounting hole (111) and the bolt mounting groove (31) are cross-shaped X-shaped.

14. The rail fastening assembly of claim 13, wherein, The depth of the first sliding groove (112) gradually thins from the bolt entering end (1111) to the other end of the bolt mounting hole (111) to form a wedge-shaped groove, the thickness of the embedded part (33) gradually thins from one end to the other end to form a wedge-shaped structure, and the first sliding groove (112) and the embedded part (33) are clamped in a way that the thin ends are located at both ends respectively.

15. A rail fastening assembly according to claim 13 or 14, characterised in that, The base (3) is provided with a second sliding groove (32), the second sliding groove (32) is parallel to the first sliding groove (112), and after the base plate connecting part (11) is connected to the base (3), the outer side wall (113) of the base connecting part (11) is limited in the second sliding groove (32).

16. The rail fastening assembly of claim 15, wherein, The thickness of the outer side wall (113) gradually thins from the bolt entering end (1111) to the other end of the bolt mounting hole (111) to form a wedge-shaped block, the depth of the second sliding groove (32) gradually thins from one end to the other end to form a wedge-shaped groove, and the outer side wall (113) and the second sliding groove (32) are clamped in a way that the thin ends are located at both ends respectively.

17. The rail fastening assembly of claim 1 or 16, wherein, Further comprising a fastener (4) comprising a bolt (41) and a nut (42), one end of the bolt (41) passes through the bolt mounting hole (111) and the bolt mounting groove (31) in sequence, and the base plate (1) and the base (3) are fastened and connected through the connection of the nut (42).

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