Insulation cushion block

By using insulating pad body and heightening plate in the air of railway lines, combined with the accommodating groove and barrier structure, the problem of differences in performance and insufficient stability of wedge-shaped wooden pads is solved, and higher insulation and stability are achieved , adapt to railway lines with different height differences.

CN222313677UActive Publication Date: 2025-01-07CHINA RAILWAY FIFTH SURVEY & DESIGN INST GRP CO LTD
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Patent Information

Application Number
CN202420658472.5
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-01
Publication Date
2025-01-07
Estimated Expiration
2034-04-01

AI Technical Summary

Technical Problem

In the prior art, the performance differences between wedge-shaped wooden pads during the overhead process of railway lines are too large, and the mechanical properties are difficult to balance, resulting in the impact of track smoothness and poor stability, which is easy to lose position or squeeze and fly under large loads. There are safety hazards.

Method used

It provides an insulating pad, including an insulating pad body and a height-adjustment plate. The pad body forms an insulating protection between the rail and the transverse lifting beam, and provides a limit effect through the accommodating groove and barrier structure, and the height-adjustment plate is raised. The height can be adjusted to accommodate different clearances, increasing stability and load-bearing capacity.

Benefits of technology

It effectively reduces the risk of circuit paths caused by contact between rails and transverse lifting beams, improves the stability of the connection position, adapts to different height differences, reduces maintenance strength and number of times, enhances insulation and stability, and reduces safety hazards.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of railway line overhead, in particular to an insulating cushion block. The insulating cushion block comprises a cushion block body and a height adjusting plate, the cushion block body is made of an insulating material, and a first supporting surface and a second supporting surface are respectively formed on the top surface and the bottom surface of the cushion block body in a first direction; the first supporting face is provided with a first containing groove extending in the extending direction of the steel rail, and / or the second supporting face is provided with a second containing groove extending in the extending direction of the transverse lifting beam. And the height adjusting plate is placed in the first accommodating groove. According to the insulating cushion block, insulating protection is formed between the steel rail and the transverse lifting beam through the cushion block body made of the insulating material, so that the risk of circuit access caused by contact between the steel rail and the transverse lifting beam in the construction process is reduced; in addition, the side face of the steel rail can be limited through the first containing groove, it is guaranteed that the connecting position of the steel rail and the cushion block body is stable, and similarly, the side face of the transverse lifting beam can be limited through the second containing groove.
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Description

Technical Field

[0001] The present application relates to the technical field of railway overhead lines, and in particular to an insulating spacer. Background Art

[0002] Railway overhead lines are widely used in railway underpass construction, railway emergency reinforcement and other engineering fields. According to the site conditions and technical conditions, there are various structural forms and operation methods. The overhead technical solution of the horizontal beam method for underpass of rails is widely used due to its clear force, mature technology, simple operation and strong applicability.

[0003] In the current conventional overhead cross beam system, the cross beam is the main load-bearing component, which is inserted between the sleepers and under the sleepers to transfer the load to the stable foundation on both sides of the railway track. The cross beam generally adopts an I-beam structure, which is orthogonal to the rails and passes under the rails along the excavated ballast groove to bear the railway load. If the rails intersect directly with the I-beam cross beam, it will cause the current path of the two rails, send out an error signal, and cause a railway safety accident; the current more commonly used technical solution is to set a wedge-shaped wooden pad at the intersection position, which plays the role of insulation, buffering and dispersing pressure, and can also adjust the height; however, the performance difference of the wedge-shaped wooden pad is too large, the mechanical properties are difficult to balance, and the deformation of each support point is also very different, which will affect the smoothness of the track; the wedge-shaped wooden pad itself has poor stability, especially under large railway loads, it is easy to lose its position or be squeezed out, posing a safety hazard. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides an insulating spacer.

[0005] The present application provides an insulating pad, comprising a pad body and a height adjustment plate, wherein the pad body is made of an insulating material, and the top surface and the bottom surface of the pad body in a first direction respectively form a first supporting surface and a second supporting surface;

[0006] The first supporting surface is provided with a first accommodating groove extending along the extension direction of the rail, and / or the second supporting surface is provided with a second accommodating groove extending along the extension direction of the cross beam; the height adjusting plate is placed in the first accommodating groove, and the depth of the first accommodating groove in the first direction is smaller than the thickness of the height adjusting plate in the first direction, and / or the height adjusting plate is placed in the second accommodating groove, and the depth of the second accommodating groove in the first direction is smaller than the thickness of the height adjusting plate in the first direction.

[0007] Optionally, a first reinforcement frame is provided between the first support surface and the second support surface, and the cushion block body is covered on the outside of the first reinforcement frame.

[0008] Optionally, the first reinforcement frame is laid in a plane parallel to the first supporting surface.

[0009] Optionally, the first reinforcement skeleton is arranged in multiple layers along the first direction.

[0010] Optionally, an angle is formed between an extension direction of the first accommodating groove and an extension direction of the second accommodating groove, and the extension direction of the first accommodating groove and the extension direction of the second accommodating groove are both perpendicular to the first direction.

[0011] Optionally, the height adjustment plate includes a second reinforcement frame and a shell wrapped around the outer periphery of the second reinforcement frame, and the shell is made of insulating material.

[0012] Optionally, the first accommodating groove is provided with first baffles on both sides along its extension direction, and the first accommodating groove is formed between the two first baffles; and / or the second accommodating groove is provided with second baffles on both sides along its extension direction, and the second accommodating groove is formed between the two second baffles.

[0013] Optionally, the two first blocking bars are provided with a first inclined surface on one side facing each other, the two first inclined surfaces are symmetrically arranged about the axis of the first receiving groove, and form a first open structure on the side facing away from the second supporting surface;

[0014] And / or the two second baffles are each provided with a second inclined surface on one side facing each other, the two second inclined surfaces are symmetrically arranged about the axis of the second accommodating groove, and form a second open structure on the side facing away from the first supporting surface.

[0015] Optionally, the height adjustment plate is formed with two guiding inclined surfaces on both sides along the extension direction of the first accommodating groove, the two guiding inclined surfaces have the same slope as the two first inclined surfaces, and the two guiding inclined surfaces are arranged in close contact with the two first inclined surfaces;

[0016] And / or two guiding slopes are formed on both sides of the height adjustment plate along the extension direction of the second accommodating groove, the two guiding slopes have the same slope as the two second slopes, and the two guiding slopes are arranged to fit the two second slopes.

[0017] Optionally, the width of the first open structure is greater than the width of the rail, and / or the width of the second open structure is greater than the width of the cross beam.

[0018] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0019] The insulating pad provided in the present application forms insulating protection between the rails and the cross-lifting beams through the pad body made of insulating material, thereby reducing the risk of contact between the rails and the cross-lifting beams during construction, which may lead to circuit paths; and can also form a limiting effect on the side of the rails through the first accommodating groove to ensure the stability of the connection position between the rails and the pad body. Similarly, it can also form a limiting effect on the side of the cross-lifting beam through the second accommodating groove to ensure the stability of the connection position between the cross-lifting beam and the pad body; the insulating pad can also change its own height through the setting of the height adjustment plate, thereby adapting to the height between the rails and the cross-lifting beams with heavier gaps, and more conveniently adapting to rails and cross-lifting beams with different positions and height differences; by setting the depth of the first accommodating groove and the second accommodating groove in the first direction to be less than the thickness of the height adjustment plate in the first direction, the two accommodating grooves can be used to limit the lateral displacement of the height adjustment plate, and the rails and the cross-lifting beams can still be limited by the depth of the two accommodating grooves after the height adjustment plate is placed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is a schematic diagram of the structure in which the insulating spacer described in the embodiment of the present application is installed between the rail and the cross beam;

[0023] Figure 2 A top view of the insulating spacer described in the embodiment of the present application installed between the rail and the cross beam;

[0024] Figure 3 It is a front view of the pad body described in the embodiment of the present application;

[0025] Figure 4 A side view of the pad body described in the embodiment of the present application;

[0026] Figure 5 A top view of the pad body described in the embodiment of the present application;

[0027] Figure 6 It is a front view of the height adjustment plate described in the embodiment of the present application;

[0028] Figure 7 A side view of the height adjustment plate described in an embodiment of the present application;

[0029] Figure 8 This is a structural schematic diagram of the height adjustment plate described in an embodiment of the present application installed on the pad body.

[0030] Among them, 1. the block body; 11. the first supporting surface; 111. the first baffle; 1111. the first inclined surface; 12. the second supporting surface; 121. the second baffle; 1211. the second inclined surface; 131. the first accommodating groove; 132. the second accommodating groove; 14. the first reinforcing frame; 2. the height adjustment plate; 21. the guiding inclined surface; 22. the second reinforcing frame; 23. the shell; 3. the rail; 4. the horizontal lifting beam. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0033] The existing technology mainly sets wedge-shaped wooden blocks at the intersection to play the role of insulation, buffering and pressure dispersion, and can also adjust the height; however, the performance of the wedge-shaped wooden blocks varies too much, the mechanical properties are difficult to balance, and the deformation of each support point also varies greatly, which will affect the smoothness of the track; the wedge-shaped wooden blocks themselves have poor stability, especially under large railway loads, they are easy to lose their position or be squeezed out, posing a safety hazard.

[0034] Based on this, the present embodiment provides an insulating pad, which forms insulating protection between the rails and the cross beams through the pad body made of insulating material, thereby reducing the risk of contact between the rails and the cross beams during construction, which may lead to circuit paths; and the first receiving groove can also form a limiting effect on the side of the rails to ensure the stability of the connection position between the rails and the pad body. Similarly, the second receiving groove can also form a limiting effect on the side of the cross beam to ensure the stability of the connection position between the cross beam and the pad body; the insulating pad can also change its own height by setting a height adjustment plate, thereby adapting to the height between the rails and the cross beams with heavier gaps, and more conveniently adapting to rails and cross beams with different positions and height differences; by setting the depth of the first receiving groove and the second receiving groove in the first direction to be less than the thickness of the height adjustment plate in the first direction, the two receiving grooves can be used to limit the lateral displacement of the height adjustment plate, and the rails and the cross beams can still be limited by the depth of the two receiving grooves after the height adjustment plate is placed. The following is a detailed description of this through specific embodiments:

[0035] Reference Figures 1 to 8 As shown, an insulating pad provided in this embodiment includes a pad body 1 and a height adjusting plate 2, the pad body 1 is made of insulating material, and the top surface and bottom surface of the pad body 1 in the first direction respectively form a first supporting surface 11 and a second supporting surface 12; the first supporting surface 11 is provided with a first accommodating groove 131 extending along the extension direction of the rail 3, and / or the second supporting surface 12 is provided with a second accommodating groove 132 extending along the extension direction of the cross beam 4; the height adjusting plate 2 is placed in the first accommodating groove 131, and the depth of the first accommodating groove 131 in the first direction is less than the thickness of the height adjusting plate 2 in the first direction, and / or the height adjusting plate 2 is placed in the second accommodating groove 132, and the depth of the second accommodating groove 132 in the first direction is less than the thickness of the height adjusting plate 2 in the first direction; it should be understood that the first direction can be the direction of gravity.

[0036] The insulating spacer provided in this embodiment forms insulation protection between the rail 3 and the cross beam 4 through the spacer body 1 made of insulating material, thereby reducing the risk of contact between the rail 3 and the cross beam 4 during construction, which may lead to circuit path; and can also form a limiting effect on the side of the rail 3 through the first accommodating groove 131 to ensure that the connection position between the rail 3 and the spacer body 1 is stable. Similarly, it can also form a limiting effect on the side of the cross beam 4 through the second accommodating groove 132 to ensure that the connection position between the cross beam 4 and the spacer body 1 is stable. The structural design of the insulating spacer is novel, which further enhances the insulation and stability of the rail 3 and the cross beam 4, and plays a role in the track circuit. Better protection can be achieved, and the maintenance intensity and frequency of construction personnel can be significantly reduced; the insulating pad can also change its own height by setting the height-adjusting plate 2, so as to adapt to the height between the rails 3 and the cross-lifting beam 4 with heavier gaps, and it is more convenient to adapt to the rails 3 and cross-lifting beams 4 with different positions and height differences; by setting the depth of the first accommodating groove 131 and the second accommodating groove 132 in the first direction to be smaller than the thickness of the height-adjusting plate 2 in the first direction, the two accommodating grooves can be used to limit the lateral displacement of the height-adjusting plate 2, and after the height-adjusting plate 2 is padded, the rails 3 and the cross-lifting beam 4 can still be limited by the depth of the two accommodating grooves.

[0037] Continue to refer to Figure 4 As shown, a first reinforcing frame 14 is provided between the first supporting surface 11 and the second supporting surface 12, and the pad body 1 is covered on the outside of the first reinforcing frame 14; such a configuration can utilize the first reinforcing frame 14 to improve the bearing capacity of the pad body 1, and can also utilize the pad body 1 itself to protect the first reinforcing frame 14; when the first reinforcing frame 14 is a structure such as a steel plate, the pad body 1 made of insulating material can also be used to further improve the safety of the entire insulating pad, avoiding indirect contact between the rail 3 and the cross beam 4 through the first reinforcing frame 14 during construction.

[0038] In some embodiments, the first reinforcing skeleton 14 is laid in a plane parallel to the first supporting surface 11 ; thereby forming a stable and reliable supporting effect in the first direction, and effectively enhancing the bearing capacity of the entire cushion block body 1 in the first direction.

[0039] In a further embodiment, the first reinforcing skeleton 14 is arranged in multiple layers along the first direction; such an arrangement can further form a stable and reliable supporting effect in the first direction, and further enhance the bearing capacity of the entire pad body 1 in the first direction; it should be noted that every two adjacent layers of the first reinforcing skeleton 14 can be arranged in a close fit, or can be separated by the pad body 1, thereby reducing the relative slippage of the two layers of the first reinforcing skeleton 14 and damaging the pad body 1, and can also further improve the stability and durability of the entire pad body 1; specifically, each layer of the first reinforcing skeleton 14 can also be arranged on the plane in a circular, radial, rectangular array, or the like.

[0040] In a further embodiment, an angle is formed between the extension direction of the first accommodating groove 131 and the extension direction of the second accommodating groove 132, and the extension direction of the first accommodating groove 131 and the extension direction of the second accommodating groove 132 are both perpendicular to the first direction; specifically, the extension direction of the first accommodating groove 131 can be perpendicular to the extension direction of the second accommodating groove 132, so that when applied to the orthogonal connection between the rail 3 and the cross-lifting beam 4, the extension direction of the first accommodating groove 131 can form any angle with the extension direction of the second accommodating groove 132, as long as it can ensure compatibility with the extension direction of the rail 3 and the extension direction of the cross-lifting beam 4.

[0041] In some embodiments, the material of the pad body 1 is a polymer organic material, specifically, a flexible polymer organic material, which can increase the friction coefficient and has a stronger ability to restrain the displacement of the rail 3 or the cross beam 4 under railway load, thereby effectively ensuring the lateral smoothness of the rail 3 or the cross beam 4. In addition, the flexible polymer organic material wraps the rigid inner core skeleton to insulate the cross beam 4 from the rail 3, thereby buffering the railway train load.

[0042] In some embodiments, the height adjusting plate 2 includes a second reinforcing frame 22 and a shell 23 wrapped around the outer peripheral side of the second reinforcing frame 22, the shell 23 is an insulating material, specifically, the material of the shell 23 can be a polymer organic material, thereby increasing the friction coefficient, and having a stronger ability to restrain the displacement of the rail 3 or the cross beam 4 under railway load, and can effectively ensure the lateral smoothness of the rail 3 or the cross beam 4; wherein, the second reinforcing frame 22 can be made of the same material as the first reinforcing frame 14, and both can be structures such as steel plates; such a configuration can utilize the second reinforcing frame 22 to improve the bearing capacity of the height adjusting plate 2.

[0043] In a further embodiment, the second reinforcing skeleton 22 can be arranged in multiple layers along the first direction; specifically, each layer of the second reinforcing skeleton 22 can also be arranged in a circular, radial, rectangular array, etc. on the plane; thereby further improving the structural strength of the height adjustment plate 2 itself and the bearing capacity of the height adjustment plate 2.

[0044] Specifically, the first receiving groove 131 is provided with a first stop bar 111 on both sides along its extension direction, and the first receiving groove 131 is formed between the two first stop bars 111; and / or the second receiving groove 132 is provided with a second stop bar 121 on both sides along its extension direction, and the second receiving groove 132 is formed between the two second stop bars 121; through the setting of the first stop bar 111 and the second stop bar 121, while forming the first receiving groove 131 and the second receiving groove 132, the height adjustment plate 2, the rail 3 and the cross-lifting beam 4 can also be laterally limited, and the transverse direction refers to the direction perpendicular to the extension direction of the rail 3 or the cross-lifting beam 4; thereby facilitating the placement of the rail 3 and the cross-lifting beam 4 into the first receiving groove 131 and the second receiving groove 132, and also making it more convenient to place the height adjustment plate 2 into the first receiving groove 131 or the second receiving groove 132.

[0045] In some embodiments, the two first baffles 111 are each provided with a first inclined surface 1111 on the side facing each other, the two first inclined surfaces 1111 are symmetrically arranged about the axis of the first accommodating groove 131, and a first open structure is formed on the side facing away from the second supporting surface 12; and / or the two second baffles 121 are each provided with a second inclined surface 1211 on the side facing each other, the two second inclined surfaces 1211 are symmetrically arranged about the axis of the second accommodating groove 132, and a second open structure is formed on the side facing away from the first supporting surface 11; by setting the first inclined surface 1111 and the second inclined surface 1211, a guiding structure can be formed, and at the same time, a reinforcing rib structure can be formed for the first baffle 111 and the second baffle 121, so as to ensure the connection strength between the first baffle 111 and the pad body 1, and the connection strength between the second baffle 121 and the pad body 1.

[0046] Continue to refer to Figure 6 and Figure 8As shown, two guiding slopes 21 are formed on both sides of the height adjusting plate 2 along the extension direction of the first accommodating groove 131, and the two guiding slopes 21 have the same slope as the two first slopes 1111, and the two guiding slopes 21 are correspondingly arranged to fit the two first slopes 1111; and / or two guiding slopes 21 are formed on both sides of the height adjusting plate 2 along the extension direction of the second accommodating groove 132, and the two guiding slopes 21 have the same slope as the two second slopes 1211, and the two guiding slopes 21 are correspondingly arranged to fit the two second slopes 1211; such an arrangement can further improve the connection reliability between the height adjusting plate 2 and the pad block body 1, and at the same time, the two guiding slopes 21 can be used for automatic positioning to ensure that the height adjusting plate 2 is installed quickly and accurately.

[0047] In some embodiments, the width of the first open structure is greater than the width of the rail 3, and / or the width of the second open structure is greater than the width of the cross beam 4; when the rail 3 falls on the pad body 1, the first inclined surface 1111 and the second inclined surface 1211 can be used to make the pad body 1 automatically slide to the middle position, making the installation process of the pad body 1 faster and more accurate.

[0048] The specific implementation method and implementation principle are the same as those in the above embodiment, and can bring the same or similar technical effects, which will not be described one by one here. For details, please refer to the description of the above insulation pad embodiment.

[0049] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0050] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An insulating spacer, characterized in that: It comprises a cushion block body (1) and a height adjustment plate (2), wherein the cushion block body (1) is made of an insulating material, and the top surface and bottom surface of the cushion block body (1) in a first direction respectively form a first supporting surface (11) and a second supporting surface (12); The first supporting surface (11) is provided with a first accommodating groove (131) extending along the extension direction of the steel rail (3), and / or the second supporting surface (12) is provided with a second accommodating groove (132) extending along the extension direction of the cross beam (4); the height adjusting plate (2) is placed in the first accommodating groove (131), and the depth of the first accommodating groove (131) in the first direction is less than the thickness of the height adjusting plate (2) in the first direction, and / or the height adjusting plate (2) is placed in the second accommodating groove (132), and the depth of the second accommodating groove (132) in the first direction is less than the thickness of the height adjusting plate (2) in the first direction.

2. The insulating spacer according to claim 1, characterized in that: A first reinforcing frame (14) is provided between the first supporting surface (11) and the second supporting surface (12), and the cushion block body (1) is wrapped around the outside of the first reinforcing frame (14).

3. The insulating spacer according to claim 2, characterized in that: The first reinforcement frame (14) is laid in a plane parallel to the first supporting surface (11).

4. The insulating spacer according to claim 3, characterized in that: The first reinforcement frame (14) has multiple layers arranged along a first direction.

5. The insulating spacer according to claim 1, characterized in that: An angle is formed between the extension direction of the first accommodating groove (131) and the extension direction of the second accommodating groove (132), and the extension direction of the first accommodating groove (131) and the extension direction of the second accommodating groove (132) are both perpendicular to the first direction.

6. The insulating spacer according to claim 1, characterized in that: The height adjustment plate (2) comprises a second reinforcement frame (22) and a shell (23) covering the outer circumference of the second reinforcement frame (22); the shell (23) is made of insulating material.

7. The insulating spacer according to any one of claims 1 to 6, characterized in that: The first receiving groove (131) is provided with first stop bars (111) on both sides along its extension direction, and the first receiving groove (131) is formed between the two first stop bars (111); and / or the second receiving groove (132) is provided with second stop bars (121) on both sides along its extension direction, and the second receiving groove (132) is formed between the two second stop bars (121).

8. The insulating spacer according to claim 7, characterized in that: The two first blocking bars (111) are each provided with a first inclined surface (1111) on one side facing each other, the two first inclined surfaces (1111) are symmetrically arranged about the axis of the first receiving groove (131), and form a first open structure on the side facing away from the second supporting surface (12); And / or the two second baffles (121) are each provided with a second inclined surface (1211) on one side facing each other, the two second inclined surfaces (1211) are symmetrically arranged about the axis of the second receiving groove (132), and form a second open structure on the side facing away from the first supporting surface (11).

9. The insulating spacer according to claim 8, characterized in that: The height adjustment plate (2) is provided with two guiding inclined surfaces (21) on both sides along the extension direction of the first receiving groove (131); the two guiding inclined surfaces (21) have the same slope as the two first inclined surfaces (1111), and the two guiding inclined surfaces (21) are arranged to fit the two first inclined surfaces (1111); And / or the height adjustment plate (2) is formed with two guiding inclined surfaces (21) on both sides along the extension direction of the second receiving groove (132), the two guiding inclined surfaces (21) have the same slope as the two second inclined surfaces (1211), and the two guiding inclined surfaces (21) are arranged to fit the two second inclined surfaces (1211).

10. The insulating spacer according to claim 8, characterized in that: The width of the first open structure is greater than the width of the steel rail (3), and / or the width of the second open structure is greater than the width of the cross beam (4).