Design method of switch rail elastic guard rail device

Abstract

This invention discloses a design method for an elastic guard rail device for turnout switch rails. By determining the lateral bearing capacity of the elastic guard rail device and the distance between the guard rail and the rail, the elastic support frame provides a certain degree of flexibility between the guard rail and the rail. This method prevents train wheels from derailing at the turnout switch rail, reduces wear on the turnout switch rail, extends the service life of the turnout switch rail, enhances the stability of the track structure at the turnout switch rail, improves the smoothness of trains passing through the turnout laterally, and reduces the workload of track maintenance. The method is simple in steps, easy to calculate, and has good results.

Description

Technical Field

[0001] This invention relates to the field of rail transit, and in particular to a design method for a turnout switch point rail elastic guard device. Background Technology

[0002] Turnouts are essential components of rail transit, but also one of the three weakest links in the track. Wear and damage to the turnout switch rails not only shortens the rail replacement cycle and increases the workload of track maintenance, but also affects train dynamics, thus impacting safe train operation. To address this, scholars both domestically and internationally have conducted extensive research on turnout switch rail wear and proposed some solutions. However, turnout switch rail wear and damage remain severe, necessitating the design of a device to reduce turnout switch rail wear. Summary of the Invention

[0003] The purpose of this invention is to address the problems of severe wear and damage to existing turnout switch rails, which shorten the rail replacement cycle, increase the workload of track maintenance, and affect train dynamics and thus train safety. This invention provides a design method for an elastic guard rail device for turnout switch rails.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A design method for a flexible guard rail device for a turnout switch rail, wherein the flexible guard rail device is installed at the front end of the turnout switch rail, the flexible guard rail device includes a guard rail and several flexible support frames, the guard rail is connected to the inner side of the rail through the flexible support frames, and the distance between the guard rail and the rail is:

[0006] L1 = STd

[0007] L2=(S+ΔS 正 -ε S )-(T-ΔT 负 +d 小 -ε r )

[0008] L3 = L2 + iL

[0009] The lateral bearing capacity Q of the elastic guardrail device is:

[0010]

[0011] In the formula, Q—the lateral bearing capacity of the turnout switch rail elastic guard device; n—a guarantee coefficient; v max —Maximum lateral turnout speed in this section; R—Guide curve radius; t—Axle load; g—Acceleration due to gravity; μ—Coefficient of friction between wheel and rail; q—Wheelset width; l—Bogie length; ai — Distance from the instantaneous rotation center of the bogie to the center point of the straight track; L1— Distance between the guard rail and the rail in the straight section; L2— Distance between the guard rail and the rail at the beginning of the buffer section; L3— Distance between the guard rail and the rail at the beginning of the open section; S— Track gauge; T— Wheelset inner distance; d—Wheel flange thickness; △S 正 —Gap tolerance; εs—Dynamic gauge expansion; △T 负 —Negative tolerance for the inner distance of the wheelset; d 小 —Minimum rim thickness; ε r —Wheels reduction; i —Reduction rate; L —Length of the open section.

[0012] The design method of the turnout switch rail elastic guard device described in this invention determines the lateral bearing capacity of the elastic guard device and the distance between the guard rail and the rail. The elastic support frame provides a certain degree of flexibility between the guard rail and the rail, which helps to prevent train wheels from derailing at the turnout switch rail, reduce wear on the turnout switch rail, extend the service life of the turnout switch rail, enhance the stability of the track structure at the turnout switch rail, improve the smoothness of train lateral turnout crossing, and reduce the workload of track maintenance. The method is simple in steps, easy to calculate, and has good results.

[0013] As a preferred embodiment of the present invention, the combined stiffness D of the elastic guardrail device is:

[0014]

[0015] In the formula, Q represents the lateral bearing capacity of the turnout switch rail elastic guard device; S represents the lateral bearing capacity of the turnout switch rail elastic guard device. max —Maximum track gauge; S min —Minimum track gauge; D1—a constant; P—wheel load; a—distribution coefficient; — Wheel-rail impact angle.

[0016] Using this method, the combined stiffness setting is further determined by the lateral bearing capacity of the elastic guard rail device, the structural design of the elastic guard rail device is optimized, and the smoothness of the guard rail to the turnout switch rail is improved.

[0017] As a preferred embodiment of the present invention, the length of the guard rail is 3800±5mm.

[0018] As a preferred technical solution of the present invention, the elastic support frame is a cantilever structure with double L-arms stacked on top of each other, and there is a cavity between the double L-arms. One end of the elastic support frame is detachably connected to the guard rail, and the other end is detachably connected to the steel rail.

[0019] Using this method, the cantilever structure with double L-arms stacked on top of each other is a rigid component. At the same time, the cavity in the middle allows the cantilever structure to have a certain amount of lateral deformation. This satisfies both the requirement that the elastic support frame has sufficient rigidity to support the guard rail and the requirement that the elastic support frame has a certain degree of flexibility to resist wheel impact, so that the train can pass through the turnout smoothly.

[0020] As a further preferred technical solution of the present invention, the elastic support frame includes an outer support and an inner support. Both the outer support and the inner support are L-shaped. The bottom ends of both the outer support and the inner support are connected to a first connecting part, and the top ends of both the outer support and the inner support are connected to a second connecting part. The inner support is spaced apart inside the outer support. The first connecting part is detachably connected to the steel rail, and the second connecting part is detachably connected to the guard rail.

[0021] As a further preferred technical solution of the present invention, the first connecting part is fitted with a pressure block, the first connecting part is provided with a positioning part and a first connecting hole, the positioning part extends to the inner bracket, the positioning part is used for positioning the rail, the pressure block and the first connecting hole are connected by bolts, and the cooperation between the pressure block and the positioning part is used to fix the rail.

[0022] As a further preferred technical solution of the present invention, the second connecting part is provided with a second connecting hole, and the second connecting hole and the guard rail are connected by bolts.

[0023] As a further preferred technical solution of the present invention, an insulating sheet is provided between the elastic support frame and the rail.

[0024] As a further preferred technical solution of the present invention, an adjustment piece is provided between the elastic support frame and the guard rail, and the size of the distance between the guard rail and the rail is precisely controlled by setting the adjustment piece.

[0025] The present invention also provides a turnout switch rail elastic guard device, which is designed and manufactured using the design method of the turnout switch rail elastic guard device as described in any of the above claims.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0027] 1. The design method of the turnout switch rail elastic guard device of the present invention determines the lateral bearing capacity of the elastic guard device and the distance between the guard rail and the rail. The elastic support frame provides a certain degree of flexibility between the guard rail and the rail, which can prevent train wheels from derailing at the turnout switch rail, reduce the wear of the turnout switch rail, extend the service life of the turnout switch rail, enhance the stability of the track structure at the turnout switch rail, improve the smoothness of the train passing through the turnout laterally, and reduce the workload of track maintenance. The method is simple in steps, easy to calculate, and has good effect.

[0028] 2. The design method of the turnout switch rail elastic guard rail device of the present invention further determines the setting size of the combined stiffness by the lateral bearing capacity of the elastic guard rail device, optimizes the structural design of the elastic guard rail device, and improves the stability of the guard rail to the turnout switch rail.

[0029] 3. The design method of the turnout switch rail elastic guard rail device of the present invention is as follows: the cantilever structure with double L-shaped arms stacked on top of each other is a rigid component, and the cavity in the middle allows the cantilever structure to have a certain amount of lateral deformation. This satisfies both the requirement that the elastic support frame has sufficient rigidity to support the guard rail and the requirement that the elastic support frame has a certain degree of flexibility to resist wheel impact, so that the train passes through the turnout smoothly on the side. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure of the turnout switch point rail elastic guard device.

[0031] Figure 2 This is a structural schematic diagram of an elastic support frame.

[0032] Figure 3 This is a schematic diagram of the adjustment piece.

[0033] Figure 4 This is a schematic diagram of the planar structure of the turnout switch point rail elastic guard device.

[0034] The markings in the diagram are: 1-guard rail, 2-rail, 3-elastic support frame, 31-outer support, 32-inner support, 33-second connection part, 34-first connection part, 35-positioning part, 36-first connecting hole, 37-second connecting hole, 4-pressure block, 5-insulating sheet, 6-adjusting piece, 7-sleeper, 8-turnout switch rail. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the accompanying drawings.

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, the present invention discloses a design method for a turnout switch rail elastic guard device. The elastic guard device is installed at the front end of the turnout switch rail 8. The elastic guard device includes a guard rail 1 and several elastic support frames 3. The guard rail 1 is connected to the inner side of the rail 2 through the elastic support frames 3. The length of the guard rail 1 is 3800±5mm, and the distance between the guard rail 1 and the rail 2 is:

[0039] L1 = STd

[0040] L2=(S+ΔS 正 +ε S )-(T-ΔT 负 +d 小 -ε r )

[0041] L3 = L2 + iL

[0042] The lateral bearing capacity Q of the elastic guardrail device is:

[0043]

[0044] The combined stiffness D of the elastic guardrail device is:

[0045]

[0046] In the formula, Q—the lateral bearing capacity of the turnout switch rail elastic guard device; n—a guarantee coefficient; v max —Maximum lateral turnout speed in this section; R—Guide curve radius; t—Axle load; g—Acceleration due to gravity; μ—Coefficient of friction between wheel and rail; q—Wheelset width; l—Bogie length; a i — Distance from the instantaneous rotation center of the bogie to the center point of the bogie; linear track gauge; L1— Distance between the guard rail 1 and the rail 2 in the straight section; L2— Distance between the guard rail 1 and the rail 2 at the beginning of the buffer section; L3— Distance between the guard rail 1 and the rail 2 at the beginning of the open section; S— Track gauge; T— Inner wheel distance; d—Wheel flange thickness; △S 正 — Track gauge tolerance; ε s —Dynamic gauge expansion; △T 负 —Negative tolerance for the inner distance of the wheelset; d 小 —Minimum rim thickness; ε r—Wheelset reduction; i —Reduction rate; L —Open section length; S max —Maximum track gauge; S min —Minimum track gauge; D1—a constant; P—wheel load; a—distribution coefficient; — Wheel-rail impact angle.

[0047] As a preferred embodiment, the elastic support frame 3 is a cantilever structure with double L-arms stacked vertically, and there is a cavity between the double L-arms. One end of the elastic support frame 3 is detachably connected to the guard rail 1, and the other end is detachably connected to the steel rail 2. An insulating sheet 5 is provided between the elastic support frame 3 and the steel rail 2, and an adjusting piece 6 is provided between the elastic support frame 3 and the guard rail 1. The size of the distance between the guard rail 1 and the steel rail 2 is precisely controlled by setting the adjusting piece 6.

[0048] In one specific implementation, such as Figure 2 As shown, the elastic support frame 3 includes an outer support 31 and an inner support 32. Both the outer support 31 and the inner support 32 are L-shaped. The bottom ends of the outer support 31 and the inner support 32 are connected to a first connecting part 34, and the top ends of the outer support 31 and the inner support 32 are connected to a second connecting part 33. The inner support 32 is spaced apart inside the outer support 31. The first connecting part 34 is detachably connected to the rail 2, and the second connecting part 33 is detachably connected to the guard rail 1. The first connecting part 34 is fitted with a pressure block 4. The first connecting part 34 is provided with a positioning part 35 and a first connecting hole 36. The positioning part 35 extends to the inner support 32 and is used for positioning the rail 2. The pressure block 4 and the first connecting hole 36 are connected by bolts. The cooperation between the pressure block 4 and the positioning part 35 is used to fix the rail 2. The second connecting part 33 is provided with a second connecting hole 37, and the second connecting hole 37 is connected to the guard rail 1 by bolts.

[0049] This embodiment describes a design method for a turnout switch rail elastic guardrail device. By determining the lateral bearing capacity of the elastic guardrail device and the distance between the guardrail 1 and the rail 2, the elastic support frame 3 provides a certain degree of flexibility between the guardrail 1 and the rail 2. The lateral bearing capacity of the elastic guardrail device determines the setting of the combined stiffness. This method prevents train wheels from derailing at the turnout switch rail 8, reduces wear on the turnout switch rail 8, extends the service life of the turnout switch rail 8, enhances the track structure stability at the turnout switch rail 8, improves the smoothness of train lateral turnout passage, and reduces the workload of track maintenance. The cantilever structure with double L-shaped supports stacked on top of each other is a rigid component. At the same time, the cavity in the middle allows the cantilever structure to have a certain amount of lateral deformation. This satisfies both the requirement that the elastic support frame 3 has sufficient rigidity to support the guardrail 1 and the requirement that the elastic support frame 3 has a certain degree of flexibility to resist wheel impact, making the train lateral turnout passage smooth. This method is simple in steps, easy to calculate, and has good results.

[0050] Example 2

[0051] like Figures 1 to 4 As shown, the turnout switch rail elastic guard device of the present invention is designed and manufactured using the design method of the turnout switch rail elastic guard device as described in Example 1.

[0052] like Figure 4 As shown, the elastic guardrail device includes 11 elastic support frames 3 and 11 corresponding pressure blocks 4, as follows: Figure 1 and Figure 2 As shown, each of the elastic support frames 3 is a cantilever cast steel structure, and each of the pressure blocks 4 is connected to the corresponding elastic support frame 3 by T-bolts to fix the elastic support frame 3 on the rail 2. The rail 2 is set on the sleeper 7, and the insulating sheet 5 is provided between each elastic support frame 3 and the rail 2, and between each pressure block 4 and the rail 2.

[0053] The guard rail 1 is bolted to one end of all the elastic support frames 3, and the adjusting piece 6 is provided between the guard rail 1 and the elastic support frame 3. Figure 3 As shown, the adjusting pieces 6 have different thicknesses, which facilitates precise adjustment of the distance between the guard rail 1 and the steel rail 2, i.e., adjusting the size of L1, L2, and L3.

[0054] like Figure 4 As shown, the spacing between the guard rail 1 and the rail 2 is set in the order of large (open section) → medium (buffer section) → small (straight section) → medium (buffer section) → large (open section).

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A design method for a turnout switch rail elastic guard device, characterized in that, The elastic guard rail device is installed at the front end of the turnout switch rail (8). The elastic guard rail device includes a guard rail (1) and several elastic support frames (3). The guard rail (1) is connected to the inner side of the rail (2) through the elastic support frames (3). The distance between the guard rail (1) and the rail (2) is: The lateral bearing capacity Q of the elastic guardrail device is: In the formula, Q—the lateral bearing capacity of the turnout switch rail elastic guard device; n—a guarantee coefficient; v max —Maximum lateral turnout speed in this section; R—Guide curve radius; t—Axle load; g—Acceleration due to gravity; μ—Coefficient of friction between wheel and rail; q—Wheelset width; l—Bogie length; a i — Distance from the instantaneous rotation center of the bogie to the center point of the bogie; linear track gauge; L1— Distance between the guard rail (1) and the rail (2) in the straight section; L2— Distance between the guard rail (1) and the rail (2) at the beginning of the buffer section; L3— Distance between the guard rail (1) and the rail (2) at the beginning of the open section; S— Track gauge; T— Inner wheel distance; d— Wheel flange thickness; ΔS 正 — Track gauge tolerance; ε S —Gap dynamic expansion; ΔT 负 —Negative tolerance for the inner distance of the wheelset; d 小 —Minimum rim thickness; ε r —Wheels reduction; i —Reduction rate; L —Length of the open section; The combined stiffness D of the elastic guardrail device is: In the formula, Q represents the lateral bearing capacity of the turnout switch rail elastic guard device; S represents the lateral bearing capacity of the turnout switch rail elastic guard device. max —Maximum track gauge; S min —Minimum track gauge; D1—a constant; P—wheel load; a—distribution coefficient; —Rail impact angle; The elastic support frame (3) is a cantilever structure with double L-arms stacked on top of each other. There is a cavity between the double L-arms. One end of the elastic support frame (3) is detachably connected to the guard rail (1), and the other end is detachably connected to the steel rail (2).

2. The design method of the turnout switch rail elastic guard device according to claim 1, characterized in that, The length of the guard rail (1) is 3800±5mm.

3. The design method of the turnout switch rail elastic guard device according to claim 1, characterized in that, The elastic support frame (3) includes an outer support (31) and an inner support (32). Both the outer support (31) and the inner support (32) are L-shaped. The bottom ends of the outer support (31) and the inner support (32) are connected to a first connecting part (34). The top ends of the outer support (31) and the inner support (32) are connected to a second connecting part (33). The inner support (32) is spaced apart inside the outer support (31). The first connecting part (34) is detachably connected to the rail (2), and the second connecting part (33) is detachably connected to the guard rail (1).

4. The design method of the turnout switch rail elastic guard device according to claim 3, characterized in that, The first connecting part (34) is fitted with a pressure block (4). The first connecting part (34) is provided with a positioning part (35) and a first connecting hole (36). The positioning part (35) extends to the inner bracket (32). The positioning part (35) is used for positioning the rail (2). The pressure block (4) and the first connecting hole (36) are connected by bolts. The cooperation between the pressure block (4) and the positioning part (35) is used to fix the rail (2).

5. The design method of the turnout switch rail elastic guard device according to claim 3, characterized in that, The second connecting part (33) is provided with a second connecting hole (37), and the second connecting hole (37) and the guard rail (1) are connected by bolts.

6. The design method of the turnout switch rail elastic guard device according to claim 1, characterized in that, An insulating sheet (5) is provided between the elastic support frame (3) and the rail (2).

7. The design method of the turnout switch rail elastic guard device according to claim 1, characterized in that, An adjustment piece (6) is provided between the elastic support frame (3) and the guard rail (1).

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