A polyurethane track pad

Abstract

The utility model discloses a kind of polyurethane under rail pads, belong to railway fittings field.It solves the problem that pad cannot be used in low temperature or large temperature difference environment, and has the characteristics of long service life, shock absorption and noise reduction, strong bearing capacity.The under rail pad includes the pad body made of polyurethane material, the bottom corner of the four corners below the pad is provided, the top surface of the pad is provided with several evenly spaced grooves, the two sides of the base have convex, 0.5mm higher surface, the convex height of the two sides of the pad and its size can meet the optimization of static stiffness, and the dynamic and static stiffness ratio value is excellent.The pad material selects polyurethane material, the embrittlement temperature is low, can adapt to extremely low temperature environment, and supporting effect is good, and service life is long.

Description

Technical Field

[0001] This utility model belongs to the technical field of railway rail pads, specifically relating to a polyurethane rail pad. Background Technology

[0002] In recent years, with the acceleration of urbanization and the increasingly close regional economic ties, the construction of rail transit (including subways, national railways, high-speed railways, etc.) has shown a booming trend. In current rail line design, ballastless track has become the mainstream choice. However, controlling the vibration and noise of this track not only affects passenger comfort but may also have adverse impacts on the surrounding environment and residents' lives. Therefore, how to effectively reduce track vibration and noise has become a focus of attention in the rail transit field. Furthermore, the impact between the wheels and rails of heavy-haul trains is exceptionally severe, thus placing extremely stringent requirements on the load-bearing capacity and fatigue resistance of heavy-haul fasteners, especially elastic pads. Currently, the main structural forms of elastic pads are mostly rubber-based grooved and mesh types. However, rubber materials used in heavy-haul railways are easily crushed, leading to fastener failure.

[0003] In regions with significant temperature differences and distinct seasons, rail transit has special requirements for fastener pads. They must be universally applicable, maintain relatively constant elasticity under large temperature variations, and have a long fatigue life. Rail pads are used between rails and sleepers to provide insulation and vibration damping. Previously, rail pads were mostly made of rubber, which had drawbacks such as high susceptibility to temperature changes, inadequate protection, short service life, and inconvenient recycling. Therefore, current rail pads are generally made of polyester elastomer material. Polyester elastomer combines the elasticity of rubber with the strength of engineering plastics, has adjustable hardness, is easy to process, and has a long service life. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a track pad that is adaptable to large temperature differences (especially low temperature environments), reduces vibration and noise, has strong load-bearing capacity, and has a long service life.

[0005] The purpose of this utility model can be achieved through the following technical solution: a track pad, comprising a square plate-shaped body, wherein the four corners of the bottom of the cube of the body have integrated base feet, and the top and bottom surfaces of the body have several evenly spaced and elongated grooves, characterized in that the grooves are set to the same length as the body and the bottom of the grooves is a plane, and several rectangular protrusions of equal area are on several spaced surfaces between the grooves, and the two ends of the grooves respectively penetrate the two narrow sides of the body.

[0006] In the aforementioned polyurethane rail underplate, the depth of the groove is 3.35 mm.

[0007] In the aforementioned polyurethane rail pad, the number of grooves is eight on the top surface and nine on the bottom surface.

[0008] In the aforementioned polyurethane track pad, there are four feet located at the bottom corners of the two narrow sides of the body, and the inner sidewalls of the feet slope inward and transition to the bottom surface of the body.

[0009] In the aforementioned polyurethane track pad, except for the central cuboid protrusion, the areas of the other cube protrusions are all equal.

[0010] In the aforementioned polyurethane track pad, the raised section has small rectangular raised sections of equal area on both sides of the top surface.

[0011] Compared with existing technologies, the rail pad has a reasonable structural design, a suitable dynamic-to-static stiffness ratio and tensile strength, good support effect, strong load-bearing capacity, excellent compression set and fatigue performance, low wear, long service life, low embrittlement temperature, and can be used in extremely low temperature environments. Attached Figure Description

[0012] Figure 2 This is the main structural view of the present utility model.

[0013] Figure 1 This is a bottom view of the structure of this utility model.

[0014] In the diagram, 1 is the main body; 2 is the convex height; 3 is the groove; and 4 is the bottom corner. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0016] like Figure 1 , Figure 2 As shown, this polyurethane rail pad includes a square plate-shaped body 1, with integrated base feet 4 at the four corners of the cube-shaped bottom of the body 1. The top and bottom surfaces of the body 1 have several evenly spaced, elongated grooves 3. The grooves 3 are of the same length as the body 1, and both ends of the grooves 3 penetrate the two narrow sides of the body 1, facilitating drainage and impurity removal. The grooves and the supporting surface have suitable overall elasticity and tensile strength, helping to maintain the overall static stiffness of the pad. Several cuboid protrusions 2 of equal area are provided on the supporting surface between adjacent grooves 3. The bottom surface of the body 1 is the contact surface with the sleeper, and the top surface is the supporting surface with the rail.

[0017] This polyurethane rail pad, with its grooves 3 on the top and bottom surfaces, effectively reduces the contact area with the rails and sleepers, lowering friction loss. The through-type structure of the grooves 3 facilitates drainage and sewage discharge, extending its service life. The flat bottom of the grooves ensures the pad has suitable static stiffness, providing stable support. The cuboid protrusions 2 between the grooves 3 further enhance the pad's local bearing capacity and fatigue resistance, resulting in a more uniform load distribution.

[0018] The base foot 4 of this polyurethane rail pad is located at the bottom corner of the main body 1, and works with the sleeper to limit its position, thereby improving the stability of the pad after installation.

[0019] Body 1 is made of a specially formulated polyurethane elastomer material. This material has been optimized to combine excellent low-temperature toughness, high load-bearing capacity, and fatigue resistance. It can maintain its elasticity even at a low temperature of -50℃ and is not easily brittle. The dynamic-to-static stiffness ratio is controlled within a reasonable range, ensuring both shock absorption and support stiffness, making it suitable for harsh working conditions such as high-altitude and heavy-load environments.

[0020] To elaborate further, the depth of groove 3 is 3.35 mm. This depth design optimizes the elastic deformation capacity of the pad while ensuring structural strength, resulting in a more reasonable dynamic-to-static stiffness ratio and improved vibration damping and noise reduction. There are eight grooves 3 on the top surface and nine on the bottom surface. The convex heights 2 between the grooves 3 are rationally arranged; except for the central convex height, which has a slightly different area to accommodate structural stress distribution, the remaining convex heights have equal areas, ensuring consistent load transfer. Small rectangular convex heights of equal area are also provided on both sides of the top surface to further enhance the support stability and resistance to eccentric loads in the edge areas.

[0021] In this embodiment, there are four feet 4, located at the bottom corners of the two narrow sides of the main body 1. The inner sidewalls of the feet 4 slope inward and smoothly transition to the bottom surface of the main body 1. This design not only enhances the fitting effect between the feet and the sleepers, but also avoids stress concentration and improves the structural durability of the feet.

[0022] This technical solution features a simple and reasonable pad structure, low embrittlement temperature, good fatigue performance, strong load-bearing capacity, and good shock absorption effect, making it highly valuable for practical use.

[0023] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A polyurethane track pad, comprising a square plate-shaped body (1), the bottom of the body (1) having an integrally formed base (4), the top and bottom surfaces of the body (1) having a plurality of evenly spaced and elongated grooves (3), and a cuboid protrusion (2) of equal area on the plane between two grooves of the body, characterized in that, The groove (3) is set to the same length as the body (1), and the two ends of the groove (3) pass through the two narrow sides of the body (1). The bottom of the groove (3) is a plane. There are two types of convex heights: one is located in the central area of ​​the bottom and top surfaces, and the other is located in the two sides of the top surface. The two have different areas, but the same height.

2. The polyurethane rail underplate according to claim 1, characterized in that, The groove (3) has a depth of 3.35 mm.

3. A polyurethane rail underplate according to claim 2, characterized in that, The number of grooves (3) is eight on the top surface and nine on the bottom surface.

4. A rail underplate according to claim 1, characterized in that, The number of the base feet (4) is four and they are located at the bottom corners of the two narrow sides of the body (1). The inner sidewall of the base feet (4) is inclined inward and transitions to the bottom surface of the body (1).

5. A rail pad according to claim 1, characterized in that, The convex height protrudes 0.5 mm from the surface.

Images