A combined frog with strengthened wing rail

Abstract

A combined frog with strengthened wing rails, comprising a switch rail (1), two wing rails (2) and two heel rails (3). The two wing rails (2) are symmetrically fixed on both sides of the switch rail (1), and the two heel rails (3) are symmetrically fixed on both sides of the tail of the switch rail (1) and are located between the two wing rails (2). One of the wing rails (2) is formed by welding a standard section (2-1) at the front end and a strengthened section (2-2) at the rear end, and the weld seam is located between the front end of the wing rail (2) and the frog throat (6). By optimizing the position of the weld seam of the wing rail, the invention moves the weld seam of the wing rail forward to the front of the frog throat, so that the weld seam of the wing rail is far away from the wheel load transfer area, enabling the wheel to pass through the weld seam of the wing rail smoothly and safely, improving the stress state of the weld seam of the wing rail, and solving the problem of uneven wear on the top surface of the weld seam of the wing rail.

Description

Technical Field

[0001] The invention belongs to the technical field of railway switch manufacturing, and particularly relates to a combined frog with strengthened wing rails. Background Art

[0002] The continuously welded rail (CWR) has become the main track connection form of the current railway main line because it completely eliminates joint diseases. The heart rail of the alloy steel combined frog is made of wear-resistant materials such as bainitic steel, and the heel rail and wing rails are made of pearlitic steel rails of the same material as the line. This not only solves the seamless requirement of the fixed frog but also improves the service life of the frog due to the use of wear-resistant materials, and is favored by users and gradually develops into the main structural type of the fixed frog. However, due to the inevitable existence of harmful space in this type of frog structure, the stress conditions of the wing rails are harsh, resulting in serious wear and damage of the wing rails, affecting the service life of the frog and the safety of train operation.

[0003] The utility model patent (ZL201922097433.4) proposes a welded wing rail combined frog and protection structure for railway tracks, including wing rails arranged on both sides and a heart rail located between the wing rails. The wing rail is welded by ordinary rail segments at both ends and an alloy steel rail segment in the middle, with two welds; the spacer is arranged between two adjacent welded wing rails in the frog, and the weld corresponds to the middle of the spacer; a bolt connection hole that penetrates horizontally and is perpendicular to the web of the wing rail is arranged in the middle of the spacer; there are two rail splints, which are respectively arranged on the outer sides of the two wing rails, and a through bolt connection hole is arranged in the middle of the splint, which matches the bolt connection hole on the spacer; the bolt assembly penetrates through the bolt connection holes of the spacer and the rail splint, and fixes the spacer and the splint to the two welded wing rails, playing a protective role for the weld. However, during the use of the frog, the traffic volume on one side is often larger and the traffic volume on the other side is smaller. The wing rail on the side with a smaller traffic volume can meet the use requirements by using ordinary line rails without using wear-resistant wing rails. It can be seen that both wing rails in the above patent are connected by welded wing rails and four welds, which not only causes waste of wear-resistant materials but also increases the safety risk caused by the weak weld. Especially, two of the welds are located in the wheel load transfer area. When the wheel moves from the heart rail to the wing rail or from the wing rail to the heart rail, the weld is greatly impacted by the wheel; and the softened area inevitably existing in the weld area has a lower hardness, resulting in faster wear of the wing rail weld part and even a risk of fracture. Summary of the Invention

[0004] The invention proposes a combined frog with strengthened wing rails, which on the one hand reduces the number of welds and reduces the safety risk caused by the weak weld, and on the other hand optimizes the weld position, improves the stress state of the weld, and effectively solves the problem of uneven wear on the top surface of the wing rail weld.

[0005] Technical solution of the present invention: A combined frog with strengthened wing rails, comprising a switch rail, two wing rails and two heel rails. The two wing rails are symmetrically fixed on both sides of the switch rail, and the two heel rails are symmetrically fixed on both sides of the tail of the switch rail and are located between the two wing rails. One of the wing rails is formed by welding a standard section at the front end and a strengthened section at the rear end, and the weld seam is located between the front end of the wing rail and the frog throat.

[0006] The standard section is a common rail, and the strengthened section is a wear-resistant rail.

[0007] Clamps are provided on both sides of the weld seam, and the clamps are fixedly connected to both sides of the wing rail web by high-strength bolt pairs.

[0008] The inner shape of the clamp is adapted to the web of the wing rail.

[0009] The switch rail is a wear-resistant switch rail.

[0010] Advantages and positive effects of the present invention:

[0011] 1. By optimizing the combined structure of the wing rails, the present invention reduces the number of weld seams of the wing rails and reduces the safety risks caused by the weak weld seams.

[0012] 2. By optimizing the position of the wing rail weld seam, the present invention moves the wing rail weld seam forward to the front of the frog throat, making the wing rail weld seam away from the wheel load transfer area, enabling the wheels to pass through the wing rail weld seam smoothly and safely, improving the stress state of the wing rail weld seam, and solving the problem of uneven wear on the top surface of the wing rail weld seam.

[0013] 3. By installing clamps on both sides of the weld seam, the present invention further improves the stress state of the wing rail weld seam, increases the overall strength at the wing rail weld seam, and reduces the safety risks of wing rail fracture.

[0014] 4. By optimizing the overall structure of the frog and strengthening only the wing rail on the side with a larger passing traffic volume, the present invention not only has a simple structure, fewer wing rail weld seams, is easy to process, manufacture and assemble, doubles the production efficiency, but also significantly reduces the manufacturing cost. Description of the drawings

[0015] Figure 1 is a schematic structural diagram of the first embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of the second embodiment of the present invention;

[0017] Figure 3 is Figure 1 、 Figure 2 the cross-sectional assembly structural diagram of the weld position A-A in

[0018] Figure 4 is a schematic structural diagram of the clamp of the present invention;

[0019] Figure 5 It is a schematic diagram of the position of the present invention in the switch. Detailed implementation manners

[0020] Embodiment 1: A straight-through single-sided wing rail reinforced combined frog, which is suitable for use when the straight-through traffic volume of the switch is large. Refer to Figure 1 、 3 、4, 5, including a heart rail 1, two wing rails 2 and two heel rails 3. The two wing rails 2 are symmetrically fixed on both sides of the heart rail 1, and the two heel rails 3 are symmetrically fixed on both sides of the tail of the heart rail 1 and are located between the two wing rails 2. Among them, the lower wing rail 2 connected to the straight rail of the switch is welded by a standard section 2-1 at the front end and a reinforced section 2-2 at the rear end, and the weld is located between the front end of the wing rail 2 and the frog throat 6. The standard section 2-1 is an ordinary rail, and its material is the material of the ordinary line rail, which meets the on-site welding conditions of the seamless line frog and the straight rail of the switch. The reinforced section 2-2 is a wear-resistant rail, preferably alloy wear-resistant materials such as bainitic alloy steel, high manganese steel or NM400, to improve the strength and wear resistance of the wing rail in the harmful space of the frog. The upper wing rail 2 connected to the curved rail of the switch is an ordinary rail, and its material is the material of the ordinary line rail, which meets the on-site welding conditions of the seamless line frog and the curved rail of the switch.

[0021] Through the above scheme, by optimizing the position of the wing rail weld, the wing rail weld is moved forward to the front of the frog throat, so that the wing rail weld is far away from the wheel load transfer area, enabling the wheel to pass through the wing rail weld smoothly and safely, improving the stress state of the wing rail weld, and solving the problem of uneven wear on the top surface of the wing rail weld.

[0022] In order to further improve the stress state of the wing rail weld, enhance the overall strength at the wing rail weld, and reduce the safety risk of wing rail fracture. On both sides of the weld, there are splints 4, and the splints 4 are connected and fixed to both sides of the rail waist of the wing rail 2 through high-strength bolt pairs 5. And the inner shape of the splint 4 is adapted to the rail waist of the wing rail 2. The two splints 4 and the wing rail 2 are fixed as a whole through the high-strength bolt pairs 5 to protect the weld, improve the stress state of the weld, enhance the overall strength at the weld, and reduce the safety risk of weld fracture.

[0023] In order to improve the overall strength and wear resistance of the frog, the heart rail 1 is a wear-resistant heart rail, which is made of alloy wear-resistant materials such as bainitic alloy steel, high manganese steel or NM400, to improve the strength and wear resistance of the heart rail, and thus realize the improvement of the overall wear resistance and strength of the frog.

[0024] Embodiment 2: A lateral single-sided wing rail reinforced combined frog, which is suitable for use when the lateral traffic volume of the switch is large. Refer to Figure 2 、 3, 4, 5. The basic structure is the same as that of the first embodiment. The difference is that the upper wing rail 2 connected to the curved stock rail of the switch is welded by a standard section 2-1 at the front end and a strengthened section 2-2 at the rear end, and the weld seam is located between the front end of the wing rail 2 and the frog throat 6. The lower wing rail 2 connected to the straight stock rail of the switch is an ordinary rail, and its material is the same as that of the ordinary track rail, meeting the welding conditions of the seamless turnout frog and the straight stock rail of the switch.

[0025] The above embodiments are only preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A combined frog with strengthened wing rails, comprising a stock rail (1), two wing rails (2) and two heel rails (3). The two wing rails (2) are symmetrically fixed on both sides of the stock rail (1), and the two heel rails (3) are symmetrically fixed on both sides of the tail of the stock rail (1) and are located between the two wing rails (2); it is characterized in that: Among them, the traffic volume The wing rail (2) on the side with a larger traffic volume is welded by a standard section (2-1) at the front end and a strengthened section (2-2) at the rear end, and the weld seam is located between the front end of the wing rail (2) and the frog throat (6). The other wing rail (2) is an ordinary rail; The standard section (2-1) is an ordinary rail, and the strengthened section (2-2) is a wear-resistant rail. The wear-resistant rail is bainitic alloy steel, high manganese steel or NM400 alloy wear-resistant material; on both sides of the weld seam of the welding, there are splints (4), and the splints (4) are fixedly connected to both sides of the wing rail (2) web by high-strength bolt pairs (5).

2. The improved combined frog with strengthened wing rail according to claim 1, characterized in that: The inner shape of the splint (4) is adapted to the web of the wing rail (2).

3. The improved combined frog with strengthened wing rail according to claim 2, characterized in that: The switch rail (1) is a wear-resistant switch rail.

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