Flash welding mechanism for variable cross-section steel rail

Abstract

The flash welding mechanism comprises a static frame clamp, a movable frame clamp, an upsetting cylinder, a first clamping cylinder, a second clamping cylinder and a center shaft, a rail top block is installed on the center shaft, a first clamping piece comprises an outer side electrode and an abutting piece, and firstly, a first side face abuts against the rail head side face of the variable-section steel rail; then, the abutting end abuts against the rail head lower jaw of the variable-section steel rail, the spring is installed on the installation end and the outer side electrode in a compressed mode, and the bolt is installed at the installation end in a threaded mode; and finally, the variable-cross-section steel rail is clamped through the first clamping piece, the normal steel rail is clamped through the second clamping piece, the upsetting cylinder drives the upsetting piston rod, and flash welding of the normal steel rail and the variable-cross-section steel rail is achieved. The flash welding mechanism for the variable-cross-section steel rail can clamp and weld the variable-cross-section steel rail.

Description

Technical Field

[0001] This utility model relates to the field of railway turnout welding technology, and more specifically, to a flash welding mechanism for variable cross-section steel rails. Background Technology

[0002] Existing mobile flash welding mechanisms are only suitable for welding conventional or channel rails. Typical structures are described in Chinese patent documents with application numbers 98105796.9, 98106266.0, 200910182212.5, 201020650427.3, 201110431236.7, 201310199232.X, and 201310314592.X. The mechanism's structure includes two pairs of clamps. The rail clamping mechanism has a clamping device and an upsetting cylinder at one end of the machine body, with the upsetting cylinder located in the horizontal plane of the rail web. The other end has a clamping device and a push-out cylinder. The clamping device includes left and right clamping jaws that are hinged to each other in the middle by a fixed central hinge shaft. The lower part of the left and right clamping jaws has relatively protruding left and right jaws, respectively. The upper ends of the left and right clamping jaws are respectively hinged to the two ends of the clamping cylinder. The central hinge shaft is fitted with a lifting bushing, and the lower part of the lifting bushing is fixed with a positioning block.

[0003] The problem with the above welding machine structure is that the clamp box is too wide, and the upsetting cylinder occupies the horizontal position of the rail web. In the railway turnout area, there are AT variable cross section rails. The characteristic of this type of rail is that it has a variable cross section, with the front end being a standard rail and the rear end being a lower asymmetrical rail. The clamp of the above welding machine cannot clamp the AT variable cross section rail, so it cannot weld the AT variable cross section rail. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a flash welding mechanism for variable cross-section rails, which can clamp and weld variable cross-section rails.

[0005] To achieve the above objectives, this utility model provides a flash welding mechanism for variable cross-section steel rails, comprising a stationary clamp, a moving clamp, two opposing forging cylinders, a first clamping cylinder, a second clamping cylinder, and a central shaft. The forging cylinder comprises a forging cylinder body and a forging piston rod, which are respectively mounted on the stationary clamp and the moving clamp. The extension and retraction of the forging piston rod drives the moving clamp to reciprocate. The first clamping cylinder comprises a first clamping cylinder body and a first clamping piston rod, which is mounted on the central shaft. The upper end of the stationary clamp is symmetrically mounted on the first clamping cylinder. The first clamping piston rod is telescopically mounted on the piston rod, extending and retracting in a direction perpendicular to the central axis. The second clamping cylinder includes a second clamping cylinder body and a second clamping piston rod. The second clamping cylinder body is mounted on the central axis. The upper end of the movable clamp is symmetrically mounted on the second clamping piston rod, which extends and retracts in a direction perpendicular to the central axis. The central axis passes through both the stationary clamp and the movable clamp, allowing both the stationary clamp and the movable clamp to be rotatably mounted on the central axis. The lower end of the stationary clamp includes two first clamping elements, and the lower end of the movable clamp includes two... The second clamping member comprises two of the first clamping members used to clamp or release the variable cross-section rail, and two of the second clamping members used to clamp or release the normal rail. A rail top block is installed on one end of the central shaft above the rail head of the variable cross-section rail. The first clamping member includes an outer electrode and an abutment member. The abutment member includes a positioning block, a bolt, and a spring. The outer electrode includes a first side surface and a second side surface connected together. The first side surface abuts against the side surface of the rail head of the variable cross-section rail. The first side surface has a first through hole, and the second side surface has a second through hole communicating with the first through hole. A cavity is formed inside the outer electrode, and the abutment is located inside the cavity and is slidably disposed within the cavity in a direction perpendicular to the lower jaw surface of the variable cross-section rail. The positioning block includes an abutment end and an mounting end disposed opposite to each other. The abutment end is used to abut against the lower jaw of the variable cross-section rail. The spring is compressed and mounted on the mounting end and the outer electrode. The bolt is threaded onto the mounting end. When the abutment end abuts against the lower jaw of the variable cross-section rail, the spring lifts the variable cross-section rail so that the rail head tread of the variable cross-section rail abuts against the rail top block.

[0006] Optionally, a set screw is also included, which is mounted on the mounting end and abuts against the outer surface of the bolt.

[0007] Optionally, the spring is a disc spring.

[0008] Optionally, the lateral width between the lower ends of the two first clamping members is less than or equal to the lateral width between the lower ends of the two second clamping members.

[0009] Optionally, the second clamping member includes a pressure-holding and pushing cylinder and a pushing knife holder. The pushing cylinder includes a pushing cylinder body and a pushing rod that is drivenly connected to the pushing cylinder body. The second clamping member has a jaw end, the pushing cylinder body is mounted on the jaw end, and the pushing knife holder is mounted on the pushing rod.

[0010] Optionally, it also includes a first guide shaft and a second guide shaft. The first guide shaft is installed through the stationary clamp and the moving clamp, and is located above the first clamping member and the second clamping member on the same side. The second guide shaft is installed through the stationary clamp and the moving clamp, and is located above the first clamping member and the second clamping member on the same side.

[0011] Optionally, the stationary clamp includes a first horizontal bar, a first clamping rod, a second clamping rod, and two stationary arms. The first clamping piston rod is installed at the center of the first horizontal bar. The first horizontal bar includes a first end and a second end that are arranged opposite to each other. The first end is rotatably installed at one end of the first clamping rod, and the other end of the first clamping rod is rotatably installed at the upper end of one of the stationary arms. The second end is rotatably installed at one end of the second clamping rod, and the other end of the second clamping rod is rotatably installed at the upper end of the other stationary arm. The movable clamp includes a second horizontal bar, a third clamping rod, a fourth clamping rod, and two movable arms. The second clamping piston rod is installed at the center of the second horizontal bar. The second horizontal bar includes a third end and a fourth end that are arranged opposite to each other. The third end is rotatably installed at one end of the third clamping rod, and the other end of the third clamping rod is rotatably installed at the upper end of one of the movable arms. The fourth end is rotatably installed at one end of the fourth clamping rod, and the other end of the fourth clamping rod is rotatably installed at the upper end of the other movable arm.

[0012] The flash welding mechanism for variable cross-section rails provided by this utility model includes a stationary clamp, a moving clamp, two opposing forging cylinders, a first clamping cylinder, a second clamping cylinder, and a central shaft. The lower end of the stationary clamp includes two first clamping components, and the lower end of the moving clamp includes two second clamping components. A rail top block is installed on one end of the central shaft above the rail head of the variable cross-section rail. The first clamping components include an outer electrode and an abutment component. The abutment component includes a positioning block, a bolt, and a spring. First, the first side is abutted against the side of the rail head of the variable cross-section rail. Then, the abutting end is placed against the lower jaw of the variable cross-section rail head. A spring is compressed and installed on the mounting end and the outer electrode. A bolt is threaded onto the mounting end. When the abutting end is against the lower jaw of the variable cross-section rail head, the rail top block abuts against the rail head tread surface of the variable cross-section rail. Finally, the two first clamping members clamp the variable cross-section rail, and the two second clamping members clamp the normal rail. The upsetting cylinder drives the upsetting piston rod, thereby moving the moving frame clamp towards the stationary frame clamp, achieving flash welding between the normal rail and the variable cross-section rail. The flash welding mechanism for variable cross-section rails provided by this utility model can clamp and weld variable cross-section rails. Attached Figure Description

[0013] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of this utility model, wherein:

[0014] Figure 1 This is a schematic diagram of the flash welding mechanism for a variable cross-section steel rail according to an embodiment of the present invention;

[0015] Figure 2 This is a front view of a flash welding mechanism for a variable cross-section steel rail according to an embodiment of the present invention.

[0016] Figure 3 This is a partial view of a flash welding mechanism for a variable cross-section steel rail according to an embodiment of the present invention;

[0017] Figure 4 This is another partial view of the flash welding mechanism for a variable cross-section rail according to an embodiment of the present invention;

[0018] Figure 5 This is a side view of a flash welding mechanism for a variable cross-section rail according to an embodiment of the present invention.

[0019] Figure 6 This is a schematic diagram of the structure of the flash welding mechanism for a variable cross-section rail according to an embodiment of the present invention, in which the outer electrode abuts against the rail head of the variable cross-section rail.

[0020] Figure 7 This is a schematic diagram of the outer electrode structure in the flash welding mechanism of a variable cross-section rail according to an embodiment of the present invention.

[0021] Figure 8 This is a cross-sectional view of the flash welding mechanism for a variable cross-section rail according to an embodiment of the present invention, in which the abutment member is installed inside the outer electrode.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1: Static clamp; 2: Moving clamp; 3: Push cylinder; 4: Second clamping cylinder; 5: Central shaft; 6: Rail head tread; 7: Upsetting piston rod; 8: First clamping piston rod; 9: Second clamping piston rod; 10: Rail head side; 11: Second clamping element; 12: Normal rail; 13: Variable cross-section rail; 14: Rail top block; 15: Outer electrode; 16: Abutment element; 17: Positioning block; 18: Bolt; 19: Spring; 20: First side; 21: Second side; 22: Abutting end; 23: Mounting end; 24: Lower jaw of rail head; 25: Set screw; 26: First clamping element; 27: First horizontal bar; 28: First clamping rod; 29: Second clamping rod; 30: Stationary frame arm; 31: Second horizontal bar; 32: Third clamping rod; 33: Fourth clamping rod; 34: Moving frame arm; 35: First clamping cylinder; 36: Upsetting cylinder. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0025] like Figures 1 to 8As shown, the flash welding mechanism for variable cross-section rails provided by this utility model includes a stationary clamp 1, a moving clamp 2, two opposing forging cylinders 36, a first clamping cylinder 35, a second clamping cylinder 4, and a central shaft 5. The forging cylinder 36 includes a forging cylinder body and a forging piston rod 7, which are respectively mounted on the stationary clamp 1 and the moving clamp 2. The extension and retraction of the forging piston rod 7 drives the moving clamp 2 to reciprocate. The first clamping cylinder 35 includes a first clamping cylinder body and a first clamping piston rod 8, which is mounted on the central shaft 5. The upper end of the stationary clamp 1 is symmetrically mounted on the first clamping piston rod 4. On rod 8, the first clamping piston rod 8 is telescopically arranged in a direction perpendicular to the central axis 5; the second clamping cylinder 4 includes a second clamping cylinder 4 body and a second clamping piston rod 9, the second clamping cylinder 4 body is mounted on the central axis 5, and the upper end of the moving frame clamp 2 is symmetrically mounted on the second clamping piston rod 9, the second clamping piston rod 9 is telescopically arranged in a direction perpendicular to the central axis 5; the central axis 5 passes through the stationary frame clamp 1 and the moving frame clamp 2 respectively, so that the stationary frame clamp 1 and the moving frame clamp 2 can be rotatably mounted on the central axis 5; the lower end of the stationary frame clamp 1 includes two first clamping elements 26, and the lower end of the moving frame clamp 2 includes two second clamping elements 11, the two first clamping elements 26 Two second clamping members 11 are used to clamp or release the variable cross-section rail 13, and to clamp or release the normal rail 12. A rail top block 14 is installed on one end of the central shaft 5 above the rail head of the variable cross-section rail 13. The first clamping member 26 includes an outer electrode 15 and an abutment member 16. The abutment member 16 includes a positioning block 17, a bolt 18, and a spring 19. The outer electrode 15 includes a first side surface 20 and a second side surface 21 connected to each other. The first side surface 20 abuts against the rail head side surface 10 of the variable cross-section rail 13. The first side surface 20 has a first through hole, and the second side surface 21 has a second through hole communicating with the first through hole. The first through hole and the second through hole are located at... An accommodating cavity is formed inside the outer electrode 15. The abutment 16 is located inside the accommodating cavity and can be slidably disposed in the accommodating cavity along a direction perpendicular to the lower jaw surface of the rail head of the variable cross-section rail 13. The positioning block 17 includes an abutment end 22 and an mounting end 23 disposed opposite to each other. The abutment end 22 is used to abut against the lower jaw 24 of the rail head of the variable cross-section rail 13. The spring 19 is compressed and mounted on the mounting end 23 and the outer electrode 15. The bolt 18 is threadedly mounted on the mounting end 23. When the abutment end 22 abuts against the lower jaw 24 of the rail head of the variable cross-section rail 13, the spring 19 lifts the variable cross-section rail 13 so that the rail head tread 6 of the variable cross-section rail 13 abuts against the rail top block 14.

[0026] It should be noted that: the upsetting cylinder 36 includes an upsetting cylinder 36 body and an upsetting piston rod 7 drivenly connected to the upsetting cylinder 36 body; the first clamping cylinder 35 includes a first clamping cylinder 35 body and a first clamping piston rod 8 drivenly connected to the first clamping cylinder 35 body; and the second clamping cylinder 4 includes a second clamping cylinder 4 body and a second clamping piston rod 9 drivenly connected to the second clamping cylinder 4 body.

[0027] The flash welding mechanism for variable cross-section rails provided by this utility model includes a stationary clamp 1, a moving clamp 2, two opposing forging cylinders 36, a first clamping cylinder 35, a second clamping cylinder 4, and a central shaft 5. The lower end of the stationary clamp 1 includes two first clamping elements 26, and the lower end of the moving clamp 2 includes two second clamping elements 11. A rail top block 14 is installed on one end of the central shaft 5 above the rail head of the variable cross-section rail 13. The first clamping element 26 includes an outer electrode 15 and an abutment element 16. The abutment element 16 includes a positioning block 17, a bolt 18, and a spring 19. First, the first side 20 is abutted against the side 10 of the rail head of the variable cross-section rail 13; then... Then, the abutment end 22 is abutted against the lower jaw 24 of the variable cross-section rail 13. The spring 19 is compressed and installed on the mounting end 23 and the outer electrode 15. The bolt 18 is threaded onto the mounting end 23. When the abutment end 22 abuts against the lower jaw 24 of the variable cross-section rail 13, the rail top block 14 abuts against the rail head tread surface 6 of the variable cross-section rail 13. Finally, the two first clamping members 26 clamp the variable cross-section rail 13, and the two second clamping members 11 clamp the normal rail 12. The upsetting cylinder 36 drives the upsetting piston rod 7, thereby driving the moving frame clamp 2 to move towards the stationary frame clamp 1, realizing the flash welding of the normal rail 12 and the variable cross-section rail 13. The flash welding mechanism for variable cross-section rails provided by this utility model can clamp and weld the variable cross-section rail 13.

[0028] like Figure 8 As shown, it also includes a set screw 25, which is installed on the mounting end 23 and abuts against the outer surface of the bolt 18. In this embodiment, the set screw 25 can prevent the bolt 18 from moving circumferentially, thereby improving the structural stability of the flash welding mechanism of the variable cross-section rail.

[0029] In one embodiment of this utility model, spring 19 is a disc spring. Disc springs have good wear resistance and a longer service life, thereby improving the service life of the flash welding mechanism of variable cross-section steel rails.

[0030] like Figure 4 As shown, the lateral width between the lower ends of the two first clamping members 26 is less than or equal to the lateral width between the lower ends of the two second clamping members 11. In this embodiment, the narrow-mouthed two first clamping members 26 can better clamp the variable cross-section rail 13, improving the ease of use of the flash welding mechanism for the variable cross-section rail.

[0031] like Figure 2 As shown, the second clamping member 11 includes a pressure-holding and pushing cylinder 3 and a pushing blade holder. The pushing cylinder 3 includes a pushing cylinder body and a pushing rod drivenly connected to the pushing cylinder body. The second clamping member 11 has a jaw end, the pushing cylinder body is mounted on the jaw end, and the pushing blade holder is mounted on the pushing rod. In this embodiment, after the welding upsetting is completed, the rail is clamped and pressure-holding, and the force of the pushing cylinder 3 can quickly remove the weld bead, making the joint surface smoother and helping to ensure the appearance quality of the welded joint.

[0032] In one embodiment of this utility model, a first guide shaft and a second guide shaft are also included. The first guide shaft is installed through the stationary clamp 1 and the moving clamp 2, and is located above the first clamping member 26 and the second clamping member 11, which are arranged on the same side. The second guide shaft is installed through the stationary clamp 1 and the moving clamp 2, and is located above the first clamping member 26 and the second clamping member 11, which are arranged on the same side. The first guide shaft and the second guide shaft improve the structural rigidity between the stationary frame and the moving frame, thereby avoiding the adverse effect of the upsetting torque on the straightness of the welded joint and improving the welding quality of the flash welding mechanism of the variable cross-section rail.

[0033] like Figure 2 and Figure 3 As shown, the stationary clamp 1 includes a first horizontal bar 27, a first clamping rod 28, a second clamping rod 29, and two stationary arms 30. A first clamping piston rod 8 is installed at the center of the first horizontal bar 27. The first horizontal bar 27 includes a first end and a second end that are arranged opposite to each other. The first end is rotatably installed on one end of the first clamping rod 28, and the other end of the first clamping rod 28 is rotatably installed on the upper end of one stationary arm 30. The second end is rotatably installed on one end of the second clamping rod 29, and the other end of the second clamping rod 29 is rotatably installed on the upper end of the other stationary arm 30. The movable frame clamp 2 includes a second horizontal bar 31, a third clamping bar 32, a fourth clamping bar 33, and two movable frame arms 34. The second clamping piston rod 9 is installed at the center of the second horizontal bar 31. The second horizontal bar 31 includes a third end and a fourth end that are arranged opposite to each other. The third end is rotatably installed at one end of the third clamping bar 32, and the other end of the third clamping bar 32 is rotatably installed at the upper end of one movable frame arm 34. The fourth end is rotatably installed at one end of the fourth clamping bar 33, and the other end of the fourth clamping bar 33 is rotatably installed at the upper end of the other movable frame arm 34. In this embodiment, all of the above-mentioned rotating connections can be hinged. Through the rotating connection between the first horizontal bar 27, the first clamping bar 28, the second clamping bar 29 and the stationary arm 30, and through the rotating connection between the second horizontal bar 31, the third clamping bar 32, the fourth clamping bar 33 and the moving arm 34, the clamping force of the lower end of the stationary clamp 1 on the variable cross-section rail 13 and the lower end of the moving clamp 2 on the normal rail 12 are increased, thereby improving the clamping force of the flash welding mechanism of the variable cross-section rail.

[0034] The flash welding mechanism for variable cross-section rails provided by this utility model includes a stationary clamp 1, a moving clamp 2, two opposing forging cylinders 36, a first clamping cylinder 35, a second clamping cylinder 4, and a central shaft 5. The lower end of the stationary clamp 1 includes two first clamping elements 26, and the lower end of the moving clamp 2 includes two second clamping elements 11. A rail top block 14 is installed on one end of the central shaft 5 above the rail head of the variable cross-section rail 13. The first clamping element 26 includes an outer electrode 15 and an abutment element 16. The abutment element 16 includes a positioning block 17, a bolt 18, and a spring 19. First, the first side 20 is abutted against the side 10 of the rail head of the variable cross-section rail 13; then... Then, the abutment end 22 is abutted against the lower jaw 24 of the variable cross-section rail 13. The spring 19 is compressed and installed on the mounting end 23 and the outer electrode 15. The bolt 18 is threaded onto the mounting end 23. When the abutment end 22 abuts against the lower jaw 24 of the variable cross-section rail 13, the rail top block 14 abuts against the rail head tread surface 6 of the variable cross-section rail 13. Finally, the two first clamping members 26 clamp the variable cross-section rail 13, and the two second clamping members 11 clamp the normal rail 12. The upsetting cylinder 36 drives the upsetting piston rod 7, thereby driving the moving frame clamp 2 to move towards the stationary frame clamp 1, realizing the flash welding of the normal rail 12 and the variable cross-section rail 13. The flash welding mechanism for variable cross-section rails provided by this utility model can clamp and weld the variable cross-section rail 13.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A flash welding mechanism for variable cross-section steel rails, characterized in that, Includes a stationary clamp, a moving clamp, two opposing forging cylinders, a first clamping cylinder, a second clamping cylinder, and a central shaft, wherein: The upsetting cylinder includes an upsetting cylinder body and an upsetting piston rod. The upsetting cylinder body and the upsetting piston rod are respectively mounted on the stationary clamp and the moving clamp. The extension and retraction of the upsetting piston rod drives the moving clamp to reciprocate. The first clamping cylinder includes a first clamping cylinder body and a first clamping piston rod. The first clamping cylinder body is mounted on the central shaft. The upper end of the stationary clamp is symmetrically mounted on the first clamping piston rod. The first clamping piston rod is extended and retracted in a direction perpendicular to the central shaft. The second clamping cylinder includes a second clamping cylinder body and a second clamping piston rod. The second clamping cylinder body is mounted on the central shaft. The upper end of the moving frame clamp is symmetrically mounted on the second clamping piston rod. The second clamping piston rod is extended and retracted in a direction perpendicular to the central shaft. The central shaft passes through the stationary clamp and the moving clamp respectively, so that the stationary clamp and the moving clamp can be rotatably mounted on the central shaft; The lower end of the static clamp includes two first clamping members, and the lower end of the moving clamp includes two second clamping members. The two first clamping members are used to clamp or release the variable cross-section rail, and the two second clamping members are used to clamp or release the normal rail. A rail top block is installed at one end of the central shaft above the rail head of the variable cross-section rail. The first clamping member includes an outer electrode and an abutment. The abutment includes a positioning block, a bolt, and a spring. The outer electrode includes a first side and a second side connected to each other. The first side is used to abut against the side of the rail head of the variable cross-section rail. The first side has a first through hole, and the second side has a second through hole communicating with the first through hole. The first through hole and the second through hole form a receiving cavity inside the outer electrode. The abutment is positioned... The positioning block is slidably disposed within the receiving cavity and in a direction perpendicular to the lower jaw surface of the rail head of the variable cross-section rail. The positioning block includes an abutting end and an mounting end disposed opposite to each other. The abutting end is used to abut against the lower jaw of the rail head of the variable cross-section rail. The spring is compressed and mounted on the mounting end and the outer electrode. The bolt is threadedly mounted on the mounting end. When the abutting end abuts against the lower jaw of the rail head of the variable cross-section rail, the spring lifts the variable cross-section rail so that the rail head tread of the variable cross-section rail abuts against the rail top block.

2. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, It also includes a set screw, which is mounted on the mounting end and abuts against the outer surface of the bolt.

3. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, The spring is a disc spring.

4. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, The lateral width between the lower ends of the two first clamping members is less than or equal to the lateral width between the lower ends of the two second clamping members.

5. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, The second clamping member includes a pressure-holding and pushing cylinder and a pushing knife holder. The pushing cylinder includes a pushing cylinder body and a pushing rod that is drivenly connected to the pushing cylinder body. The second clamping member has a jaw end. The pushing cylinder body is installed on the jaw end, and the pushing knife holder is installed on the pushing rod.

6. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, It also includes a first guide shaft and a second guide shaft. The first guide shaft is installed through the stationary clamp and the moving clamp, and is located above the first clamping member and the second clamping member on the same side. The second guide shaft is installed through the stationary clamp and the moving clamp, and is located above the first clamping member and the second clamping member on the same side.

7. The flash welding mechanism for variable cross-section rails according to claim 1, characterized in that, The stationary clamp includes a first horizontal bar, a first clamping rod, a second clamping rod, and two stationary arms. The first clamping piston rod is installed at the center of the first horizontal bar. The first horizontal bar includes a first end and a second end that are arranged opposite to each other. The first end is rotatably installed at one end of the first clamping rod, and the other end of the first clamping rod is rotatably installed at the upper end of one of the stationary arms. The second end is rotatably installed at one end of the second clamping rod, and the other end of the second clamping rod is rotatably installed at the upper end of the other stationary arm. The movable clamp includes a second horizontal bar, a third clamping rod, a fourth clamping rod, and two movable arms. The second clamping piston rod is installed at the center of the second horizontal bar. The second horizontal bar includes a third end and a fourth end that are arranged opposite to each other. The third end is rotatably installed at one end of the third clamping rod, and the other end of the third clamping rod is rotatably installed at the upper end of one of the movable arms. The fourth end is rotatably installed at one end of the fourth clamping rod, and the other end of the fourth clamping rod is rotatably installed at the upper end of the other movable arm.

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