Welding equipment and welding method for rail connection

Abstract

A welding device and a welding method for track connection, relating to the technical field of track welding, in order to solve the problems of troublesome manual operation and low work efficiency, the present invention is arranged in a right-angled triangle with a right angle downward when viewed from the side through a shear head, a shear device 2 comprises a pushing shell 2 and a shear head 2 arranged at the driving end of the pushing shell 2, the shear head 2 is arranged in a right-angled triangle with a right angle upward when viewed from the side, the shear head 2 is movably connected to the pushing shell 2 through an active joint, and shearing is performed by forming a scissors with the shear head 1 and the shear head 2, when the shear head 1 moves, the lower end of the sand mold is squeezed, and the lower end of the sand mold squeezes the shear head 2 upward, at this time, the shear head 2 flips upward under the action of the active joint, because the sand mold is broken or cracked by the shear head 2, the resistance between the sand mold and the track becomes smaller, and it is easier to cut cleanly under the push of the shear head 1, thereby achieving a better shearing effect, easily breaking or cracking the sand mold, and further improving the work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of rail welding, and in particular to a welding device and a welding method for rail connection. Background Art

[0002] Orbital welding is a common welding method that is often used in the manufacturing and construction fields, especially in railway and road construction. This method is often used to connect tracks (such as railway tracks or roadbeds) together to ensure that they are stable and flat. In the orbital welding process, arc welding, gas shielded welding, seamless welding and other welding techniques are often used to connect two tracks together to ensure a strong connection while maintaining good track quality. Orbital welding needs to comply with relevant standards and specifications, and requires professional equipment and experienced operators to perform.

[0003] A rail butt welding system with announcement number CN111250884B in the prior art includes a positioning member, a rocker, a rotating shaft, an extrusion plate, a bolt, a rail, a fixed extrusion rod, a shear head, a sliding plate, a flux furnace, a bearing seat, a jack, a connecting rod, a slider, a material receiving tray, and a fusion welding mold. There are two sliding plates, the two sliding plates are coplanar and connected on both sides by two connecting rods. At the same time, a sliding groove is provided on the lower surface of the sliding plate and the sliding groove is arranged parallel to the connecting rod. The two sliding plates are slidably connected to the slider formed on the upper end surface of the corresponding positioning member so that the entire sliding plate can move relative to the positioning member.

[0004] However, there are the following problems in the above prior art:

[0005] When shearing the sand mold, the sand mold is only squeezed by the relative shearing head. Since the sand mold also has a certain flexibility, it is easy to cause it to be difficult to cut or crack directly, and it is time-consuming and laborious to clean it manually in the next step;

[0006] The clamping of the mold and the shearing of the sand mold need to be driven twice, the clamp needs to be fixed or disassembled manually, and the shearing head needs an additional driving part to drive, which makes the manual fixing or disassembly of the clamp troublesome and the equipment operation complicated.

[0007] Therefore, a welding device and a welding method for rail connection are needed. Summary of the invention

[0008] In order to solve all or part of the above problems, the present invention aims to provide a welding device and a welding method for rail connection, so as to solve the problems of cumbersome manual operation and low work efficiency.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a welding device for track connection, comprising a mobile chassis 1 and a clamp adjustment mechanism installed on one side of the mobile chassis 1, a mobile chassis 2 is arranged at one end of the clamp adjustment mechanism away from the mobile chassis 1, a crucible is placed in the middle of the upper end of the mobile chassis 2, a shearing transmission mechanism 1 is arranged on one side of the clamp adjustment mechanism, a shearing transmission mechanism 2 is arranged on the other side of the clamp adjustment mechanism, the shearing transmission mechanism 1 and the shearing transmission mechanism 2 have the same structural composition, a shearing device 1 is arranged at the lower end of the shearing transmission mechanism 1, and a shearing device 2 is arranged at the lower end of the shearing transmission mechanism 2, the shearing device 1 comprises a pushing shell 1 and a shearing head 1 fixedly arranged at the driving end of the pushing shell 1, and the shearing head is arranged in a right-angled triangle with a right angle at the bottom when viewed from one side, the shearing device 2 comprises a pushing shell 2 and a shearing head 2 arranged at the driving end of the pushing shell 2, and the shearing head 2 is arranged in a right-angled triangle with a right angle at the top when viewed from the side, and the shearing head 2 is movably connected to the pushing shell 2 through an active joint.

[0010] Furthermore, the clamp adjustment mechanism includes a clamp 1 and a clamp 2 symmetrically arranged with the clamp 1, a driving block 1 is arranged on both sides of the clamp 1, a driving block 2 is arranged on both sides of the clamp 2, a bidirectional threaded screw is threaded through the driving block 1 and the driving block 2 on the same side, a servo motor is arranged at one end of the bidirectional threaded screw, and the servo motor is fixedly installed on a mobile chassis 1, a sand mold is arranged between the clamp 1 and the clamp 2, a collecting pot is arranged on both sides of the clamp 1 and the clamp 2, a tray 1 is arranged on the upper end of the clamp 1, and a tray 2 is arranged on the upper end of the clamp 2, and the tray 1 and the tray 2 match the bottom of the crucible when they are combined.

[0011] Furthermore, a transmission block 1 is fixedly provided on one side of the driving block 1, a driving rack 1 is fixedly provided on one end of the transmission block 1, a transmission block 2 is fixedly provided on one side of the driving block 2, a driving rack 2 is fixedly provided on one end of the transmission block 2, a shearing transmission mechanism 1 includes a casing and a driven gear movably provided on the inner side of the casing, the driving rack 1 and the driving rack 2 are both meshed and connected with the upper end of the driven gear, a pushing rack is movably provided on the inner side of the casing, the pushing rack is meshed and connected with the lower end of the driven gear, a connecting block is provided at one end of the pushing rack, and the connecting block is fixedly connected to the shearer 1.

[0012] Furthermore, both sides of shearer 1 and shearer 2 are provided with knocking components, one end of the knocking component matches with the limiting component provided on the inner side of the casing, and multiple limiting components are provided. The knocking component includes a fixed block and a traction spring installed at the bottom inner side of the fixed block, a reset block is fixedly provided at one end of the traction spring, a knocking column is provided at the middle part of one end of the reset block close to the traction spring, the knocking column passes through the middle part of the traction spring, an active tooth head is provided on one side of the reset block, the limiting component includes a center column and a driven tooth head installed on the center column, and reset torsion springs are provided at both ends of the center column.

[0013] Another technical solution proposed by the present invention is to provide a welding method for a welding device for rail connection, comprising the following steps:

[0014] S1: Connect the joint of track 1 and track 2 with clamp 1 and clamp 2 with sand mold;

[0015] S2: Then the box is sealed. After the box is sealed, the sand mold is preheated by a preheating gun to make it evenly heated. Then the crucible is placed and aluminothermic flux is added into the crucible. Then, it is ignited to make a chemical reaction occur.

[0016] S3: After the reaction is sufficient, the crucible is removed and the collection pot for the overflow reaction residue is disassembled;

[0017] S4: Move the clamp 1 and the clamp 2 in the opposite direction, and the transmission block 1 and the transmission block 2 move in the opposite direction, thereby driving the driving rack 1 and the driving rack 2 to synchronously drive the driven gear to rotate in the same direction, thereby driving the push rack to move, and then making the relative shear 1 and the shear 2 move relative to each other;

[0018] S5: Finally, the whole device is removed, and the sand mold residue at the connection between track 1 and track 2 is finely processed, and then polished by a polishing machine, and finally the flaw detector is used to detect the welding position, and the welding is completed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention proposes a welding device for rail connection and a welding method thereof. When the shearing head 1 and the shearing head 2 perform relative shearing movements, firstly, due to the special right-angled triangle setting of the shearing head 1 and the shearing head 2, they are sheared in the form of scissors, so that the shearing effect is better and the sand mold is easily cut off. Then, due to the setting of the movable joint, the lower end of the sand mold will be squeezed and moved upward when the shearing head 1 moves, and then the shearing head 2 will be squeezed. At this time, the shearing head 2 also moves forward. At this time, the shearing head 2 flips upward under the action of the movable joint, and then the sand mold is more easily pulled off or cracked. Finally, since the lower end of the sand mold is pulled off or cracked by the shearing head 2, the amount of contact between the sand mold and the rail is small, the resistance becomes smaller, and it is easier to cut cleanly under the push of the shearing head 1, so that manual fine cleaning is more time-saving and labor-saving, and work efficiency is further improved.

[0021] The present invention proposes a welding device and a welding method for rail connection. When the initial cooling of the welding is completed, the clamp 1 and the clamp 2 are driven in reverse. At this time, the transmission block 1 and the transmission block 2 move in reverse, thereby driving the driving rack 1 and the driving rack 2 to synchronously drive the driven gear to rotate in the same direction, thereby driving the pushing rack to move, thereby making the relative shearer 1 and the shearer 2 move relative to each other to achieve a shearing effect, which not only reduces the trouble of manual operation, but also allows the shearing process to be performed while the clamp is disassembled. The structural design is ingenious, reduces the operation process, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The overall three-dimensional structure of the welding equipment for rail connection of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 2 The overall three-dimensional structure of the welding equipment for rail connection of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the clamp adjustment mechanism of the welding equipment for rail connection of the present invention;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the clamp adjustment mechanism, the shearing transmission mechanism 1, the shearing transmission mechanism 2, the shearer 1 and the shearer 2 of the welding equipment for rail connection of the present invention;

[0026] Figure 5 It is a schematic diagram of the three-dimensional structure of the clamp adjustment mechanism, the shear transmission mechanism and the shearer of the welding equipment for rail connection of the present invention;

[0027] Figure 6 It is a schematic diagram of a three-dimensional structure of a shearing device for rail connection welding of the present invention;

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of the shearer 2 of the welding equipment for rail connection of the present invention;

[0029] Figure 8 It is a schematic diagram of the shearing head and the shearing head second shearing state structure of the welding equipment for rail connection of the present invention;

[0030] Fig. 9 It is a schematic diagram of a top plan structure of a knocking assembly, a limiting assembly and a shearer of a welding device for rail connection of the present invention;

[0031] Fig.10 This is a schematic diagram of the disassembled structure of the striking component of the welding equipment for rail connection of the present invention.

[0032] In the figure:

[0033] 1. Mobile chassis 1; 11. Chassis; 12. Self-locking universal wheel; 2. Mobile chassis 2; 3. Clamp adjustment mechanism; 31. Clamp 1; 311. Tray 1; 32. Clamp 2; 321. Tray 2; 33. Drive block 1; 331. Transmission block 1; 332. Drive rack 1; 34. Drive block 2; 341. Transmission block 2; 342. Drive rack 2; 35. Bidirectional threaded screw; 36. Servo motor; 37. Sand mold; 38. Collecting pot; 4. Shear transmission mechanism 1; 41. Chassis; 42 , driven gear; 43, pushing rack; 44, connecting block; 45, knocking assembly; 451, fixing block; 452, traction spring; 453, reset block; 454, active tooth head; 455, knocking column; 46, limiting assembly; 461, center column; 462, driven tooth head; 463, reset torsion spring; 5, shearing transmission mechanism II; 6, shearer I; 61, pushing shell I; 62, shearing head I; 7, shearer II; 71, pushing shell II; 72, shearing head II; 73, movable joint; 8, crucible. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 2 As shown, a welding device for track connection includes a mobile chassis 1 and a clamp adjustment mechanism 3 installed on one side of the mobile chassis 1, a mobile chassis 2 is arranged at one end of the clamp adjustment mechanism 3 away from the mobile chassis 1, the mobile chassis 1 and the mobile chassis 2 have the same structure, both of which are composed of a chassis 11 and a self-locking universal wheel 12 arranged at the lower end of the chassis 11, so that the entire welding device can be moved on the track 1 and the track 2, which is more convenient to use, and deep holes are provided on the chassis 11 for placing auxiliary welding tools such as crowbars and awls, a groove is provided in the middle of the upper end of the mobile chassis 2, and a crucible 8 is placed in the groove, a shearing transmission mechanism 1 4 is provided on one side of the clamp adjustment mechanism 3, and a shearing transmission mechanism 2 5 is provided on the other side of the clamp adjustment mechanism 3, the shearing transmission mechanism 1 4 and the shearing transmission mechanism 2 5 have the same structure, a shearer 1 6 is provided at the lower end of the shearing transmission mechanism 1 4, and a shearer 2 7 is provided at the lower end of the shearing transmission mechanism 2 5.

[0036] like Figure 3-Figure 6As shown, the clamp adjustment mechanism 3 includes a clamp 1 31 and a clamp 2 32 symmetrically arranged with the clamp 1 31, a driving block 1 33 is arranged on both sides of the clamp 1 31, and a driving block 2 34 is arranged on both sides of the clamp 2 32, and a bidirectional threaded screw rod 35 is threadedly penetrated on the driving block 1 33 and the driving block 2 34 on the same side, and the bidirectional threaded screw rod 35 can drive the driving block 1 33 and the driving block 2 34 to move toward or oppositely, and a servo motor 36 is arranged at one end of the bidirectional threaded screw rod 35, and the servo motor 36 is fixedly installed on the mobile chassis 1. A sand mold 37 is arranged between the clamps 1 31 and 2 32, and a collecting pot 38 is arranged on both sides of the clamps 1 31 and 2 32, and the collecting pot 38 is detachably arranged on the clamps 1 31 or 2 32, so that the residue can be removed and dumped in advance, and the bidirectional threaded screw 35 is driven to rotate by the servo motor 36, which can drive the clamps 1 31 and 2 32 to realize the movement in the opposite or opposite directions, so as to facilitate the clamping or disassembly operation and avoid the trouble of manual operation. Moreover, when the clamp is removed, the sand mold 37 is still in a high temperature state, and the clamp is automatically removed to avoid the danger of manual removal.

[0037] like Figure 3 As shown, a tray 1 311 is provided at the upper end of the clamp 1 31, and a tray 2 321 is provided at the upper end of the clamp 2 32. The openings of the tray 1 311 and the tray 2 321 are opposite to each other, and match the bottom of the crucible 8 when combined. After the sand mold 37 is preliminarily preheated, the crucible 8 is placed between the tray 1 311 and the tray 2 321, and then the servo motor 36 is started again to make the clamp 1 31 and the clamp 2 32 move slightly toward each other, thereby clamping and fixing the crucible 8 to ensure the stability of the crucible 8 during use, avoid tipping over and splashing the reaction liquid onto people, and ensure the safety of the device.

[0038] like Figure 5-Figure 6 As shown, a transmission block 1 331 is fixedly provided on one side of the driving block 1 33, and a driving rack 1 332 is fixedly provided on one end of the transmission block 1 331, a transmission block 2 341 is fixedly provided on one side of the driving block 2 34, and a driving rack 2 342 is fixedly provided on one end of the transmission block 2 341, and a shearing transmission mechanism 1 4 includes a casing 41 and a driven gear 42 movably provided on the inner side of the casing 41, and the driving rack 1 332 and the driving rack 2 342 are both meshed and connected with the upper end of the driven gear 42, and a pushing rack 43 is movably provided on the inner side of the casing 41, and the pushing rack 43 is meshed and connected with the lower end of the driven gear 42, and a connecting block 44 is provided on one end of the pushing rack 43, and the connecting block 44 is fixedly connected with the shearer 1 6;

[0039] Specifically, after the initial cooling of the welding is completed, the clamp 1 31 and the clamp 2 32 are driven in reverse, and the transmission block 1 331 and the transmission block 2 341 move in reverse, thereby driving the driving rack 1 332 and the driving rack 2 342 to synchronously drive the driven gear 42 to rotate in the same direction, thereby driving the push rack 43 to move, and then the relative shears 1 6 and the shears 2 7 move relative to each other to achieve the shearing effect, which not only reduces the trouble of manual operation, but also allows the shearing process to be performed while the clamp is disassembled. The structural design is ingenious, reduces the operation process, and improves work efficiency.

[0040] like Figure 6-Figure 8 As shown, the shearing device 1 6 includes a driving shell 1 61 and a shearing head 1 62 fixedly arranged at the driving end of the driving shell 1 61, and the shearing head 1 62 is arranged in a right-angled triangle with a right angle at the bottom when viewed from the side. The shearing device 2 7 includes a driving shell 2 71 and a shearing head 2 72 arranged at the driving end of the driving shell 2 71, and the shearing head 2 72 is arranged in a right-angled triangle with a right angle at the top when viewed from the side. The shearing head 2 72 is movably connected to the driving shell 2 71 through an active joint 73, and a plurality of openings are provided at the shearing end of the shearing head 2 72. When the shearing head 1 62 and the shearing head 2 72 perform relative shearing movements, firstly, due to the special right-angled triangle arrangement of the shearing head 1 62 and the shearing head 2 72, they are sheared in the form of scissors. In this way, the shearing effect is better, and the sand mold 37 is easily cut off. Then, due to the setting of the movable joint 73, the lower end of the sand mold 37 will be squeezed when the shear head 62 moves. At this time, the lower end of the sand mold 37 will be squeezed and moved upward, thereby squeezing the shear head 72. At this time, the shear head 72 also moves forward. At this time, the shear head 72 flips upward under the action of the movable joint 73, making it easier to pull the sand mold 37 off or crack. Finally, since the lower end of the sand mold 37 is pulled off or cracked by the shear head 72, the amount of contact between the sand mold 37 and the track is small, the resistance becomes smaller, and it is easier to cut cleanly under the push of the shear head 62, making it more time-saving and labor-saving to perform manual fine cleaning, further improving work efficiency.

[0041] like Figure 9-10As shown, both sides of the shear 1 6 and the shear 2 7 are provided with a knocking assembly 45, one end of the knocking assembly 45 matches with the limiting assembly 46 provided on the inner side of the housing 41, and a plurality of limiting assemblies 46 are provided. The knocking assembly 45 includes a fixed block 451 and a traction spring 452 installed at the inner bottom of the fixed block 451, one end of the traction spring 452 is fixedly provided with a reset block 453, and the reset block 453 is provided with a knocking column 455 in the middle of one end of the traction spring 452, and the knocking column 455 passes through the middle of the traction spring 452, and a driving tooth head 454 is provided on one side of the reset block 453, and the limiting assembly 46 includes a central column 461 and a driven tooth head 46 installed on the central column 461 2. Reset torsion springs 463 are provided at both ends of the center column 461. In the initial state, the knocking column 455 is fitted with the bottom of the fixed block 451, and the active tooth head 454 is fitted with the driven tooth head 462. When the shearer 1 6 moves for shearing, the traction spring 452 will be pulled. When the reverse pulling force of the traction spring 452 is greater than the torsion of the reset torsion spring 463, the active tooth head 454 drives the driven tooth head 462 to rotate until it disengages. The reset block 453 is quickly reset under the reset effect of the traction spring 452, and drives the knocking column 455 to impact the fixed block 451, so that the shearer 1 6 is impacted, which makes it easier for the shearer 1 6 and the shearer 2 7 to shear the sand mold 37, providing shearing effect and speed.

[0042] Another technical solution proposed by the present invention is to provide a welding method for a welding device for rail connection, comprising the following steps:

[0043] Step 1: Connect the joint of track 1 and track 2 with a clamp 1 31 and a clamp 2 32 with a sand mold 37;

[0044] Step 2: After the box sealing process is completed, the sand mold 37 is preheated by a preheating gun to make it evenly heated, and then the crucible 8 is placed and thermite flux is added into the crucible 8, and then ignited to make it chemically react;

[0045] Step 3: After the reaction is complete, the crucible 8 is removed, and the collecting pot 38 for the overflow reaction residue is disassembled;

[0046] Step 4: Move the clamp 1 31 and the clamp 2 32 in the opposite direction. At this time, the transmission block 1 331 and the transmission block 2 341 move in the opposite direction, thereby driving the driving rack 1 332 and the driving rack 2 342 to synchronously drive the driven gear 42 to rotate in the same direction, thereby driving the push rack 43 to move, thereby causing the relative shear 1 6 and the shear 2 7 to move relative to each other;

[0047] Step 5: Finally, the entire device is removed, and the remaining sand mold 37 at the connection between track 1 and track 2 is finely processed, and then polished by a polishing machine, and finally the flaw detector is used to detect the welding position, and the welding is completed.

[0048] It should be noted that, in the description of the present application, it should be understood that the terms "length", "thickness", "inside", "outside", "axial", "radial", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, relational terms such as first and second, etc., are used only 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", "comprises", or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes 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 apparatus.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding device for rail connection, characterized in that: It comprises a mobile chassis 1 (1) and a clamp adjustment mechanism (3) installed on one side of the mobile chassis 1 (1); a mobile chassis 2 (2) is arranged at one end of the clamp adjustment mechanism (3) away from the mobile chassis 1 (1); a crucible (8) is placed in the middle of the upper end of the mobile chassis 2 (2); a shearing transmission mechanism 1 (4) is arranged on one side of the clamp adjustment mechanism (3); a shearing transmission mechanism 2 (5) is arranged on the other side of the clamp adjustment mechanism (3); the shearing transmission mechanism 1 (4) and the shearing transmission mechanism 2 (5) have the same structural composition; a shearing device 1 (6) is arranged at the lower end of the shearing transmission mechanism 1 (4); and a shearing device 2 (7) is arranged at the lower end of the shearing transmission mechanism 2 (5); The shearing device 1 (6) comprises a driving shell 1 (61) and a shearing head 1 (62) fixedly arranged at the driving end of the driving shell 1 (61), and the shearing head 1 (62) is arranged in a right-angled triangle with a right angle at the bottom when viewed from the side. The shearing device 2 (7) comprises a driving shell 2 (71) and a shearing head 2 (72) arranged at the driving end of the driving shell 2 (71), and the shearing head 2 (72) is arranged in a right-angled triangle with a right angle at the top when viewed from the side. The shearing head 2 (72) is movably connected to the driving shell 2 (71) via a movable joint (73); The clamp adjustment mechanism (3) comprises a clamp 1 (31) and a clamp 2 (32) symmetrically arranged with the clamp 1 (31), and a sand mold (37) is arranged between the clamp 1 (31) and the clamp 2 (32); A driving block 1 (33) is provided on both sides of the clamp 1 (31), and a driving block 2 (34) is provided on both sides of the clamp 2 (32). A bidirectional threaded screw (35) is threadedly provided on the driving block 1 (33) and the driving block 2 (34) on the same side, and a servo motor (36) is provided at one end of the bidirectional threaded screw (35). The servo motor (36) is fixedly mounted on the mobile chassis 1 (1); A transmission block 1 (331) is fixedly disposed on one side of the driving block 1 (33), and a driving rack 1 (332) is fixedly disposed on one end of the driving block 1 (331); a transmission block 2 (341) is fixedly disposed on one side of the driving block 2 (344), and a driving rack 2 (342) is fixedly disposed on one end of the driving block 2 (341); The shearing transmission mechanism 1 (4) comprises a housing (41) and a driven gear (42) movably arranged inside the housing (41); a driving rack 1 (332) and a driving rack 2 (342) are both meshedly connected with the upper end of the driven gear (42); a pushing rack (43) is movably arranged inside the housing (41); the pushing rack (43) is meshedly connected with the lower end of the driven gear (42); a connecting block (44) is arranged at one end of the pushing rack (43); and the connecting block (44) is fixedly connected to the shearing device 1 (6); When the shear head 1 (62) moves, it squeezes the lower end of the sand mold (37), which causes the lower end of the sand mold (37) to be squeezed and moved upward, thereby squeezing the shear head 2 (72). At this time, the shear head 2 (72) also moves forward. At this time, the shear head 2 (72) turns upward under the action of the movable joint (73), making it easier to break or tear the sand mold (37).

2. A welding device for rail connection according to claim 1, characterized in that: Collection pots (38) are provided on both sides of the clamp 1 (31) and the clamp 2 (32).

3. A welding device for rail connection according to claim 2, characterized in that: The upper end of the clamp one (31) is provided with a tray one (311), and the upper end of the clamp two (32) is provided with a tray two (321). When the tray one (311) and the tray two (321) are combined, they match the bottom of the crucible (8).

4. A welding device for rail connection according to claim 3, characterized in that: Both sides of the shearer 1 (6) and the shearer 2 (7) are provided with a knocking assembly (45), one end of the knocking assembly (45) matches with a limiting assembly (46) provided on the inner side of the housing (41), and a plurality of limiting assemblies (46) are provided.

5. A welding device for rail connection according to claim 4, characterized in that: The knocking assembly (45) comprises a fixed block (451) and a traction spring (452) mounted on the inner bottom of the fixed block (451); a reset block (453) is fixedly arranged at one end of the traction spring (452); a knocking column (455) is arranged at the middle of one end of the reset block (453) close to the traction spring (452); the knocking column (455) passes through the middle of the traction spring (452); and an active tooth head (454) is arranged at one side of the reset block (453).

6. A welding device for rail connection according to claim 5, characterized in that: The limiting assembly (46) comprises a central column (461) and a driven tooth head (462) mounted on the central column (461), and return torsion springs (463) are provided at both ends of the central column (461).

7. A welding method for a welding device for rail connection according to claim 6, characterized in that: The steps include: S1: Connect the joint of track 1 and track 2 using a clamp 1 (31) with a sand mold (37) and a clamp 2 (32); S2: Then the box is sealed. After the box is sealed, the sand mold (37) is preheated by a preheating gun to make it evenly heated. Then the crucible (8) is placed and aluminothermic flux is added to the crucible (8). Then, ignition is performed to cause a chemical reaction. S3: After the reaction is complete, the crucible (8) is removed and the collecting pot (38) is disassembled; S4: Move the clamp 1 (31) and the clamp 2 (32) in the opposite direction, and the transmission block 1 (331) and the transmission block 2 (341) move in the opposite direction, thereby driving the driving rack 1 (332) and the driving rack 2 (342) to synchronously drive the driven gear (42) to rotate in the same direction, thereby driving the push rack (43) to move, thereby causing the relative shears 1 (6) and the shears 2 (7) to move relative to each other; S5: Finally, the entire device is removed, and the sand mold (37) remaining at the connection between the track 1 and the track 2 is finely processed, and then polished by a polishing machine, and finally a flaw detector is used to detect the welding position, and the welding is completed.

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