Welded wing rail reinforced alloy steel combined frog and preparation method thereof

Abstract

The invention provides a welded wing rail reinforced alloy steel combined frog and a preparation method thereof. The welded wing rail reinforced alloy steel combined frog comprises a point rail and wing rails arranged on the two sides of the point rail. The wing rail comprises a front section steel rail, a middle section steel rail and a rear section steel rail which are fixedly connected in sequence from the toe end to the heel end of the frog; the front-section steel rail and the rear-section steel rail are respectively made of carbon steel or low-alloy steel, and the middle-section steel rail is made of middle-alloy steel or high-alloy steel; a first connecting area is arranged between the front-section steel rail and the middle-section steel rail, and the first connecting area is located within the range of 300-400 mm in the direction from the throat of the wing rail to the toe end of the frog; a second connecting area is arranged between the middle section steel rail and the rear section steel rail, and the second connecting area is located at the position, corresponding to the wing rail, within the range of 60-100 mm of the section width of the point rail. According to the welded wing rail reinforced alloy steel combined frog and the preparation method thereof, the performance of the wing rail can be effectively improved, the abrasion speed of the frog is reduced, and the safety and reliability of wheel rail operation are improved.

Description

Technical Field

[0001] The invention relates to the technical field of railways, and in particular to a welded wing-rail reinforced alloy steel combined frog and a preparation method thereof. Background Art

[0002] The main defects of the existing alloy steel composite switch used in railway turnouts are rapid vertical wear of the wing rails and fish scale pattern falling of the small section of the heart rail. The wing rails of the existing alloy steel composite switch are mostly integral ordinary online heat-treated rails, and the heart rail is made of alloy steel, which are two materials with different properties. Although there are some three-section welded wing rail structures in the prior art to enhance the performance of the middle section of the wing rail, the two welds of the three-section welded wing rail are mostly located in the harmful space of the wing rail. In the transition zone between the heart rail and the wing rail of the existing switch, the top of the wing rail needs to be raised and the side needs to be bent. The bending and raising make the top surface of the wing rail of the switch uneven, and even cause damage to the rails, resulting in premature derailment, affecting the safety of train operation, and increasing the cost of railway operation. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a welded wing rail reinforced alloy steel composite frog and a preparation method thereof, so as to improve the problems of poor wing rail performance and rapid wear in the prior art.

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

[0005] On the one hand, the present invention provides a welded wing-rail reinforced alloy steel composite frog, comprising a heart rail and wing rails arranged on both sides of the heart rail; the wing rails comprise a front rail, a middle rail and a rear rail which are fixedly connected in sequence from the frog toe end to the heel end; the front rail and the rear rail are respectively made of carbon steel or low alloy steel, and the middle rail is made of medium alloy steel or high alloy steel; a first connection area is provided between the front rail and the middle rail, and the first connection area is located within a range of 300mm-400mm from the throat of the wing rail to the frog toe end; a second connection area is provided between the middle rail and the rear rail, and the second connection area is located at a position corresponding to the wing rail within a range of 60mm-100mm in the cross-sectional width of the heart rail.

[0006] Furthermore, the center rail and the middle rail are made of the same or similar material.

[0007] Furthermore, the middle section rail comprises a first connecting portion, a middle section main portion and a second connecting portion which are arranged in sequence from the frog toe end to the heel end; the rail head width of the middle section main portion is greater than the rail head widths of the front section rail and the rear section rail, and the rail head thickness of the middle section main portion is greater than the rail head thickness of the front section rail and the rear section rail; the rail waist width of the middle section main portion is greater than the rail waist width of the front section rail and the rear section rail; the rail bottom thickness of the middle section main portion is greater than the rail bottom thickness of the front section rail and the rear section rail, and the rail bottom width of the middle section main portion is less than the rail bottom width of the front section rail and the rear section rail.

[0008] Furthermore, the front rail section and the rear rail section respectively include a main section and a connecting section, and the connecting section, the first connecting portion and the second connecting portion respectively form connecting surfaces at the end portions, and sizes of all the connecting surfaces are the same.

[0009] Furthermore, the rail head size at the connecting surface is the same as the rail head size of the main section, the rail waist size at the connecting surface is the same as the rail waist size of the main section, the rail bottom width size at the connecting surface is the same as the rail bottom width size of the middle section main body, and the rail bottom thickness size at the connecting surface is the same as the rail bottom thickness size of the main section.

[0010] Furthermore, the angle between the center line of the first connecting part in the height direction and the center line of the middle section main body in the height direction ranges from 3° to 6°, and the angle between the center line of the second connecting part in the height direction and the center line of the middle section main body in the height direction ranges from 1° to 2°.

[0011] Furthermore, the side surface of the wing rail is machined to form a throat section and a working side section of the wing rail.

[0012] Furthermore, the rail head top surface of the middle section main body is machined to form a stepped stacking portion and a false rim portion, the stacking portion extends along the length direction of the middle section main body and is located on the side of the rail head top surface of the middle section main body close to the center rail.

[0013] On the other hand, the present invention also provides a method for preparing a welded wing rail reinforced alloy steel composite frog, which is used to prepare the welded wing rail reinforced alloy steel composite frog as described above. The method for preparing the welded wing rail reinforced alloy steel composite frog comprises the following steps:

[0014] Preparation of wing rails: providing a rail blank of the middle rail, machining the side surfaces of the rail blank respectively by machining to form a throat section and a working side surface on the side surfaces of the wing rail; flash welding the two ends of the formed middle rail to the front rail and the rear rail respectively to form the wing rail;

[0015] Frog assembly: on both sides of the first connection area, the front rail and the middle rail are reinforced by connecting pieces;

[0016] Assembling the center rail and the fork rail;

[0017] The assembled center rail, fork heel rail and wing rail are assembled and fixed.

[0018] Furthermore, the method further comprises machining the assembled frog to form a stepped stacking portion and a false wheel flange portion on the top of the wing rail.

[0019] According to the technical solution of the present invention, the welded wing rail reinforced alloy steel composite switch provided by the present invention has a wing rail divided into three sections: a front rail, a middle rail and a rear rail, wherein the middle rail is made of medium alloy steel or high alloy steel, so that the overall performance of the wing rail is improved. And the connection areas between the front rail, the rear rail and the middle rail are respectively located outside the harmful area of ​​the wing rail, which further improves the overall mechanical properties of the wing rail, slows down the wear rate of the wing rail, and improves the overall operation stability of the rail. The preparation method of the welded wing rail reinforced alloy steel composite switch provided by the present invention is used to prepare the above-mentioned welded wing rail reinforced alloy steel composite switch. The method is simple and reliable. The side of the middle wing rail is formed by mechanical processing instead of the original bending forming, so that the top surface smoothness of the wing rail is improved, the wear resistance of the wing rail is further improved, and the safe operation of the train is effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic diagram of the overall structure of a welded wing-rail reinforced alloy steel composite frog according to an embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the overall structure of the wing rail according to an embodiment of the present invention.

[0022] Figure 3 The figure is a schematic structural diagram of a middle rail according to an embodiment of the present invention.

[0023] Figure 4 The figure is a schematic cross-sectional view of the middle section main body of the middle section rail according to an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram showing the comparative shapes of the middle section main body, the main section, and the connecting surface of the wing rail according to an embodiment of the present invention.

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the front section of the rail according to an embodiment of the present invention.

[0026] Figure 7 It is a schematic diagram of the three-dimensional structure of the rear section rail according to an embodiment of the present invention.

[0027] Figure 8 It is a cross-sectional schematic diagram of the connection structure between the wing rail and the center rail according to an embodiment of the present invention.

[0028] Fig. 9 It is a cross-sectional schematic diagram of the connection structure at the wing rail weld according to an embodiment of the present invention.

[0029] The meanings of the symbols in the accompanying drawings are:

[0030] 1. Wing rail; 11. Front rail; 12. Middle rail; 121. First connection part; 122. Middle main part; 123. Second connection part; 124. Rail head; 125. Rail waist; 126. Rail bottom; 127. Stacking part; 128. False wheel flange; 13. Rear rail; 14. First connection area; 15. Second connection area; 16. Main section; 17. Connection section; 18. Connection surface; 2. Heart rail; 3. Fork and heel rail; 4. Protective splint; 5. Spacer iron. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] like Figure 1 and Figure 2 As shown, the welded wing rail reinforced alloy steel composite frog of the embodiment of the present invention comprises a heart rail 2 and two wing rails 1 arranged on both sides of the heart rail 2. Each wing rail 1 comprises a front rail 11, a middle rail 12 and a rear rail 13 which are fixedly connected in sequence from the frog toe end to the heel end; the front rail 11 and the rear rail 13 are respectively made of carbon steel or low alloy steel, and the middle rail 12 is made of medium alloy steel or high alloy steel; a first connection area 14 is provided between the front rail 11 and the middle rail 12, and the first connection area 14 is located within a range of 300mm-400mm from the throat of the wing rail 1 to the frog toe end; a second connection area 15 is provided between the middle rail 12 and the rear rail 13, and the second connection area 15 is located within a range of 60mm-100mm of the cross-sectional width of the heart rail 2 corresponding to the wing rail 1.

[0034] Specifically, in this embodiment, the center rail 2 and the middle rail 12 are made of the same or similar materials. Similar materials refer to materials with similar chemical composition and / or performance. The middle rail 12 is the most easily worn part of the wing rail 1. By making it of the same or similar material as the center rail 2, its wear degree can be close to that of the center rail 2, which is conducive to the safe and stable operation of the rail.

[0035] like Figure 2 As shown, in this embodiment, the three sections of the wing rail 1 (the front section rail 11, the middle section rail 12 and the rear section rail 13) are all connected and fixed by flash welding. Figure 3 As shown, the middle rail 12 includes a first connecting portion 121, a middle main body 122 and a second connecting portion 123 which are arranged in sequence from the frog toe end to the heel end. Figure 4 and Figure 5 As shown, the front rail 11 and the rear rail 13 have the same rail shape, the width of the rail head 124 of the middle main body 122 is greater than the rail head width of the front rail 11 and the rear rail 13, the thickness of the rail head 124 of the middle main body 122 is greater than the rail head thickness of the front rail 11 and the rear rail 13, the width of the waist 125 of the middle main body 122 is greater than the waist width of the front rail 11 and the rear rail 13, the thickness of the rail bottom 126 of the middle main body 122 is greater than the rail bottom thickness of the front rail 11 and the rear rail 13, and the width of the rail bottom 126 of the middle main body 122 is less than the rail bottom width of the front rail 11 and the rear rail 13. The above-mentioned size design of the middle main body 122 can be formed by mechanical processing to fit the bending line shape of the wing rail 1 without bending, so that the rail top of the wing rail 1 is smoother. The purpose of providing the first connection portion 121 and the second connection portion 123 is to make the cross-sectional shapes of the welding surfaces of the middle rail 12, the front rail 11 and the rear rail 13 consistent, so as to facilitate the three to be well fixed and connected.

[0036] like Figure 6 and Figure 7 As shown, the front rail 11 and the rear rail 13 respectively include a main section 16 and a connecting section 17. The connecting section 17, the first connecting portion 121 and the second connecting portion 123 respectively form connecting surfaces 18 at their ends. The size and shape of all connecting surfaces 18 are the same. Figure 5As shown, the size of the rail head at the connection surface 18 is the same as the size of the rail head 124 of the main section 16, the size of the rail waist at the connection surface 18 is the same as the size of the rail waist 125 of the main section 16, the width of the rail bottom at the connection surface 18 is the same as the width of the rail bottom 126 of the middle section main body 122, and the thickness of the rail bottom at the connection surface 18 is the same as the thickness of the rail bottom 126 of the main section 16. That is, the cross-sectional shape of the connection surface 18, its rail head and rail waist 125 are the same as the main section 16 of the front section rail 11 and the rear section rail 13, the thickness of the rail bottom 126 is also the same as the main section 16, and only the width of the rail bottom 126 is the same as the width of the rail bottom 126 of the middle section main body 122. The connecting section 17 and the two connecting parts (the first connecting part 121 and the second connecting part 123) further include a straight section and a transition section, respectively. The straight section is a section of the rail with the same cross-section size as the connecting surface 18, and the transition section is used to make a smooth transition between the straight section and the rail body (the main body section 16 or the middle main body section 122). The length of the straight section is about 100 mm, and the length of the transition section is about 30 mm-50 mm.

[0037] like Figure 3 As shown, the angle α between the center line of the first connecting part 121 in the height direction and the center line of the middle section main body 122 in the height direction is in the range of 3°-6°, and the angle β between the center line of the second connecting part 123 in the height direction and the center line of the middle section main body 122 in the height direction is in the range of 1°-2°.

[0038] The throat section and the working side section of the rail head of the wing rail 1 are processed according to the frog line shape. The working side section and the throat section of the wing rail 1 do not need to be bent and formed.

[0039] like Figure 8 As shown, the top surface of the rail head of the middle section main body 122 is machined to form a stepped stacking portion 127 and a false wheel flange portion 128, the stacking portion 127 extends along the length direction of the middle section main body 122, and is located on the side of the top surface of the rail head of the middle section main body 122 close to the center rail 2. The machined stacking portion 127 and the false wheel flange portion 128 further improve the smoothness of the rail top of the wing rail 1, which is beneficial to improving the safety and stability of the rail.

[0040] like Figure 1 As shown, the welded wing-rail reinforced alloy steel composite frog of this embodiment may further include a fork heel rail 3, which is connected to the side of the center rail 2 close to the frog heel end, and the fork heel rail 3 is connected and fixed to the center rail 2 through a spacer iron 5 and a high-strength bolt.

[0041] The embodiment of the present invention also provides a method for preparing a welded wing rail reinforced alloy steel composite frog, which is used to prepare the above-mentioned welded wing rail reinforced alloy steel composite frog. The method for preparing a welded wing rail reinforced alloy steel composite frog comprises the following steps:

[0042] Preparation of wing rails: providing a rail blank of a middle rail 12, machining the side surfaces of the rail blank respectively, forming a throat section and a working side surface on the side surface of the wing rail 1; flash welding the two ends of the formed middle rail 12 to the front rail 11 and the rear rail 13 respectively, to form a wing rail.

[0043] Frog assembly: on both sides of the first connection area 14, the front rail 11 and the middle rail 12 are reinforced by connecting pieces; the heart rail 2 and the fork rail 3 are assembled; the assembled heart rail 2 and the fork rail 3 are assembled and fixed with the wing rail 1.

[0044] Machining: The assembled frog is machined to form a stepped stacking portion 127 and a false flange portion 128 on the rail top of the wing rail 1.

[0045] Specifically, the preparation method of the welded wing rail reinforced alloy steel composite frog comprises the following steps:

[0046] Provide rail blanks of a front rail 11, a middle rail 12 and a rear rail 13, wherein the material of the middle rail 12 is similar to that of the heart rail 2. The width and thickness of the rail head of the middle rail 12 are greater than the rail heads of the front rail 11 and the rear rail 13, the width of the waist 125 of the middle rail 12 is greater than the width of the waist 125 of the front rail 11 and the rear rail 13, the thickness of the rail bottom 126 of the middle rail 12 is greater than the thickness of the rail bottom 126 of the front rail 11 and the rear rail 13, and the width of the rail bottom 126 of the middle rail 12 is less than the width of the rail bottom 126 of the front rail 11 and the rear rail 13.

[0047] The three rail blanks (the front rail 11, the middle rail 12 and the rear rail 13) are processed to form the connection surface 18, the first connection part 121, the second connection part 123 and the connection section 17. During the processing, the rail bottom width of the rail blanks of the front rail 11 and the rear rail 13 is processed, and the rail head 124 and the rail waist 125 of the middle rail 12 are processed. At the same time, the thickness of the rail bottom 126 needs to be processed. Figure 5 As shown, the section line portion is the rail shape of the connection surface 18, the solid line is the rail shape of the front rail 11 (or the rear rail 13) before processing (that is, the rail cross section of the main section 16 of the front rail 11 or the rear rail 13), and the dotted line is the rail shape of the middle rail 12 before processing (that is, the rail cross section of the middle section main body 122 of the middle rail 12). After processing, the working edges, rail waists 125 and rail bottoms 126 of the three rails are aligned, and flash welding is performed to make the weld smooth. Fig. 9As shown, a protective splint 4 is provided at each weld, and a protective splint 4 is provided on the outer side of each of the two wing rails. A gap of 0.5-1 mm is reserved between the protective splint 4 and the rail waist 125, and the matching surface profile of the protective splint 4 and the rail is the same as the rail waist 125. Spacer irons 5 are provided on the inner sides of the two wing rails 1, and high-strength bolts are respectively penetrated on the rails on both sides of the weld to connect the protective splint 4, the wing rails 1 and the spacer irons 5.

[0048] During assembly, the heart rail 2 and the fork heel rail 3 are assembled first, and then assembled with the wing rail 1, the spacer iron 5 and the rail washer.

[0049] After the size inspection is qualified, the designed frog structure is processed to obtain the stacking part 127 and the false wheel flange part 128 on the top surface of the wing rail 1, and smoothly transition with the rounded corners of the front and rear rail sections. After the working edge and the top surface of the rail are machined, the edges are rounded and smoothly transitioned with the front and rear, so that the top surface of the wing rail 1 can effectively and reliably contact the wheel tread, ensuring that the transition area between the wing rail 1 and the heart rail 2 is smooth.

[0050] The welded wing rail reinforced alloy steel composite frog and the preparation method thereof provided in the embodiment of the present invention can realize that the wing rail does not bend, lift or bend. The 50mm section from the throat to the heart rail is machined to form a top surface pile, thereby increasing the contact area between the top surface of the wing rail and the wheel, strengthening and optimizing the wheel-rail relationship, improving the smoothness of the top surface of the transition zone between the heart rail and the wing rail, reducing the wear of the wing rail and preventing the heart rail from falling off, and increasing the service life of the frog.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A welded wing rail reinforced alloy steel composite frog, characterized in that: It comprises a heart rail and wing rails arranged on both sides of the heart rail; the wing rail comprises a front rail, a middle rail and a rear rail which are fixedly connected in sequence from the frog toe end to the heel end; the front rail and the rear rail are respectively made of carbon steel or low alloy steel, and the middle rail is made of medium alloy steel or high alloy steel; a first connection area is arranged between the front rail and the middle rail, and the first connection area is located within a range of 300mm-400mm from the throat of the wing rail to the frog toe end; a second connection area is arranged between the middle rail and the rear rail, and the second connection area is located within a range of 60mm-100mm of the cross-sectional width of the heart rail and corresponding to the wing rail.

2. The welded wing rail reinforced alloy steel composite frog according to claim 1, characterized in that: The center rail and the middle rail are made of the same or similar materials.

3. The welded wing-rail reinforced alloy steel composite frog according to claim 2, characterized in that: The middle section rail comprises a first connecting portion, a middle section main portion and a second connecting portion which are arranged in sequence from the frog toe end to the heel end; the rail head width of the middle section main portion is greater than the rail head widths of the front section rail and the rear section rail, and the rail head thickness of the middle section main portion is greater than the rail head thickness of the front section rail and the rear section rail; the rail waist width of the middle section main portion is greater than the rail waist width of the front section rail and the rear section rail; the rail bottom thickness of the middle section main portion is greater than the rail bottom thickness of the front section rail and the rear section rail, and the rail bottom width of the middle section main portion is less than the rail bottom width of the front section rail and the rear section rail.

4. The welded wing-rail reinforced alloy steel composite frog according to claim 3, characterized in that: The front rail section and the rear rail section respectively include a main body section and a connecting section. The connecting section, the first connecting portion and the second connecting portion respectively form connecting surfaces at their ends, and sizes of all connecting surfaces are the same.

5. The welded wing-rail reinforced alloy steel composite frog according to claim 4, characterized in that: The rail head size at the connecting surface is the same as the rail head size of the main section, the rail waist size at the connecting surface is the same as the rail waist size of the main section, the rail bottom width size at the connecting surface is the same as the rail bottom width size of the middle section main body, and the rail bottom thickness size at the connecting surface is the same as the rail bottom thickness size of the main section.

6. The welded wing-rail reinforced alloy steel composite frog according to claim 3, characterized in that: The angle between the center line of the first connecting part in the height direction and the center line of the middle section main body in the height direction ranges from 3° to 6°, and the angle between the center line of the second connecting part in the height direction and the center line of the middle section main body in the height direction ranges from 1° to 2°.

7. The welded wing-rail reinforced alloy steel composite frog according to claim 3, characterized in that: The sides of the wing rail are machined to form a throat section and a working side section of the wing rail.

8. The welded wing-rail reinforced alloy steel composite frog according to claim 3, characterized in that: The top surface of the rail head of the middle section body is machined to form a stepped stacking portion and a false rim portion. The stacking portion extends along the length direction of the middle section body and is located on one side of the top surface of the rail head of the middle section body close to the center rail.

9. A method for preparing a welded wing rail reinforced alloy steel composite frog, characterized in that: Used to prepare the welded wing-rail reinforced alloy steel composite frog according to any one of claims 1 to 8, the preparation method of the welded wing-rail reinforced alloy steel composite frog comprises the following steps: Preparation of wing rails: providing a rail blank of the middle rail, machining the side surfaces of the rail blank respectively by machining to form a throat section and a working side surface on the side surfaces of the wing rail; flash welding the two ends of the formed middle rail to the front rail and the rear rail respectively to form the wing rail; Frog assembly: on both sides of the first connection area, the front rail and the middle rail are reinforced by connecting pieces; Assembling the center rail and the fork rail; The assembled center rail, fork heel rail and wing rail are assembled and fixed.

10. The method for preparing the welded wing rail reinforced alloy steel composite frog according to claim 9, characterized in that: The assembled frog is machined to form a stepped pile portion and a false flange portion on the top of the wing rail.

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