A long rail welding device and its welding method

Abstract

The present invention provides a long rail welding device and a welding method thereof, including a movable seat and a fixed seat. The movable seat is slidably inserted into the fixed seat, and a linear drive assembly is arranged between the movable seat and the fixed seat. The linear drive assembly is used to drive the movable seat to move. Both the movable seat and the fixed seat have clamping cavities, and clamping assemblies are arranged in the clamping cavities. The clamping assemblies include: a first clamping assembly; a second clamping assembly; a third clamping assembly. The present invention realizes the clamping and positioning of the first position, the second position and the third position of the rail by the first clamping component, the second clamping component and the third clamping component respectively, realizes multi-point clamping according to the shape characteristics of the rail, is beneficial to maintaining the stability of the clamping, provides conditions for maintaining the relative position stability between the fixed seat or the movable seat and the rail during the upsetting process, and further resists the acting force generated during the upsetting process.

Description

Technical Field

[0001] The present invention belongs to the field of long rail welding devices, and particularly relates to a long rail welding device and a welding method thereof. Background Art

[0002] In the technology of long rail welding devices, flash welding is carried out on long rails. During the flash welding process, upsetting is required. The main purpose of upsetting in flash welding is to close the end face gap and crater, remove oxides, inclusions and liquid metal, make the combined metals in close contact, and produce a certain amount of plastic deformation to promote the recrystallization process of the weld. During the upsetting process, the two rails need to be fixed through a fixed seat and a movable seat. Then, when the movable seat drives one of the rails to move, the welding end of one rail is upset with the welding end of the other rail to achieve the upsetting work. However, during the upsetting process, the force generated by the upsetting between the rails will cause a huge impact on the jaws inside the movable seat and the fixed seat. The jaws inside the movable seat and the fixed seat both have a single clamping point with the surface of the rail, which is not conducive to resisting the force between the rail upsetting. Summary of the Invention

[0003] In view of this, the present invention aims to provide a long rail welding device and a welding method thereof to solve the technical problem that during the upsetting process, the force generated by the upsetting between the rails will cause a huge impact on the jaws inside the movable seat and the fixed seat, and the jaws inside the movable seat and the fixed seat both have a single clamping point with the surface of the rail, which is not conducive to resisting the force between the rail upsetting.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] In a first aspect, a long rail welding device is provided, including a movable seat and a fixed seat. The movable seat is slidably inserted into the fixed seat. A linear drive assembly is arranged between the movable seat and the fixed seat, and the linear drive assembly is used to drive the movable seat to move. Both the movable seat and the fixed seat have a clamping cavity, and a clamping assembly is arranged in each clamping cavity. The clamping assembly includes: a first clamping assembly, which is used to clamp two first positions of the rail; a second clamping assembly, which is used to clamp the second position of the rail; a third clamping assembly, which is used to clamp the third position of the rail.

[0006] Further, the first clamping assembly includes two socket seats and two first cylinders. The two socket seats are fixedly connected to both sides of the inner wall of the clamping cavity. A first clamping member is slidably inserted into each of the two socket seats, and the end of the first clamping member contacts the first position of the rail.

[0007] The two first cylinders are fixedly connected to both sides of the movable seat or the fixed seat. The piston rods of the two first cylinders penetrate through the movable seat or the fixed seat and extend into the interior of the socket. The end parts of the piston rods of the two first cylinders are respectively fixedly connected to two first clamping members.

[0008] Furthermore, the second clamping assembly includes a driving cavity which is opened inside the first clamping member. A first connection through groove is opened at the top end of the driving cavity. A second clamping member is slidably arranged in the first connection through groove. The top end of the second clamping member contacts the second position of the rail. A pushing assembly is arranged inside the driving cavity. The pushing assembly includes a second cylinder. The end part of the piston rod of the second cylinder is fixedly connected to a pushing block. During the clamping process, the second cylinder pushes the pushing block to press against the second clamping member, so that the second clamping member clamps the second position of the rail.

[0009] Furthermore, the third clamping assembly includes a second connection through groove which is opened at the inner bottom end of the driving cavity. A third clamping member is slidably arranged in the second connection through groove. The bottom end of the third clamping member contacts the third position of the rail. During the clamping process, the second cylinder pushes the pushing block to press against the third clamping member, so that the second clamping member clamps the third position of the rail.

[0010] Furthermore, elastic support members are arranged between the second clamping member and the third clamping member and the surface of the first clamping member. The elastic support members include socket connectors which are fixedly connected to the top or bottom surface of the first clamping member. The socket connectors are slidably inserted between the second clamping member or the third clamping member. Elastic support members are fixedly connected between the socket connectors and the second clamping member or the third clamping member.

[0011] Furthermore, a connection cavity is opened at the end of the first clamping member. A positioning seat is fixedly connected inside the connection cavity. A plurality of flipping blocks are rotatably connected inside the positioning seat. Each of the plurality of flipping blocks includes a first end and a second end. A wedge-shaped rubber block is fixedly connected to the first end of the flipping block. A top rod is in contact with the second end of the flipping block. A plurality of the top rods penetrate through the positioning seat and then extend into the interior of the driving cavity. A linkage plate is fixedly connected to one end of the plurality of top rods located in the driving cavity. During the clamping process, the pushing block will push the linkage plate under the push of the second cylinder.

[0012] Furthermore, a plurality of limiting seats corresponding to the plurality of flipping blocks one by one are also fixedly connected inside the positioning seat. The plurality of limiting seats have limiting ends. Elastic pads are fixedly connected between the limiting ends of the limiting seats and the second ends of the corresponding flipping blocks.

[0013] Further, the pushing block includes a first pushing surface, a second pushing surface, and a third pushing surface, which are respectively used to press against the first clamping member, the second clamping member, and the linkage plate during the clamping process.

[0014] Further, the linear driving assembly includes a third air cylinder, which is fixedly installed on the surface of the fixed seat, and the end of the piston rod of the third air cylinder is fixedly connected to the movable seat.

[0015] In a second aspect, a welding method is provided, including the following steps:

[0016] Step 1, installation: The movable seat and the fixed seat are respectively arranged on two steel rails through an external hoisting vehicle.

[0017] Step 2, clamping treatment: The first clamping assembly clamps the first position of the steel rail, the second clamping assembly clamps the second position of the steel rail, and the third clamping assembly clamps the third position of the steel rail, realizing multi-point clamping.

[0018] Step 3, upsetting treatment: The linear driving assembly drives the movable seat to move. The movable seat drives one of the steel rails to move through the clamping assembly, so that the welding ends of the steel rails on the movable seat and the steel rail ends on the fixed seat generate upsetting pressure, realizing the upsetting treatment.

[0019] Compared with the prior art, the long steel rail welding device and its welding method of the present invention have the following beneficial effects:

[0020] During the clamping process of the present invention, after the first clamping member clamps the first position of the steel rail, while the second air cylinder drives the pushing block to press against the second clamping member, it also presses against the third clamping member. The bottom end of the third clamping member presses against the third position of the steel rail. Thus, the first clamping member, the second clamping member, and the third clamping member respectively clamp and position the first position, the second position, and the third position of the steel rail, realizing multi-point clamping according to the shape characteristics of the steel rail, which is beneficial to maintaining the stability of clamping and providing conditions for maintaining the relative position stability between the fixed seat or the movable seat and the steel rail during the upsetting process, thereby resisting the acting force generated during the upsetting process.

[0021] During the clamping process of the present invention, when the first clamping member clamps the first position of the steel rail, it will synchronously drive the wedge-shaped rubber block at the first end of the flipping block to contact the first position of the steel rail, and make the inclined surface of the wedge-shaped rubber block contact and press against the first position of the steel rail. After the wedge-shaped rubber block deforms, it will still generate a tendency force to overcome the displacement of the steel rail relative to the first clamping member during the upsetting process, which is beneficial to further maintaining the stability of clamping.

[0022] Further explanation: During the process of the pushing block pushing the second clamping member and the third clamping member for clamping, the pushing block will push the linkage plate, and the linkage plate will synchronously drive a plurality of ejecting rods to respectively press the second ends of a plurality of flipping blocks, so that the flipping blocks always maintain the acting force of flipping and pressing the wedge-shaped rubber block, making the force generated by the deformation of the wedge-shaped rubber block to overcome the displacement trend of the steel rail relative to the first clamping member during upsetting stronger, which is beneficial to further stabilizing the clamping. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0024] Figure 1 is a schematic diagram of the first overall structure of a long steel rail welding device according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of the steel rail of a long steel rail welding device according to an embodiment of the present invention;

[0026] Figure 3 is a sectional view of the structure of the first clamping member and the plug socket of a long steel rail welding device according to an embodiment of the present invention;

[0027] Figure 4 is a sectional view of the structure of the first clamping member of a long steel rail welding device according to an embodiment of the present invention;

[0028] Figure 5 is Figure 4 an enlarged view of part A in

[0029] Figure 6 is a schematic diagram of the structure of the second clamping member of a long steel rail welding device according to an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of the structure of the third clamping member of a long steel rail welding device according to an embodiment of the present invention;

[0031] Figure 8 is a schematic diagram of the structure of the second cylinder and the pushing block of a long steel rail welding device according to an embodiment of the present invention;

[0032] Figure 9 is a schematic diagram of the structures of two states of the first clamping member of a long steel rail welding device according to an embodiment of the present invention;

[0033] Figure 10 is a schematic diagram of the second overall structure of a long steel rail welding device according to an embodiment of the present invention;

[0034] Figure 11 This is the method flow chart of the welding method described in the embodiments of the present invention.

[0035] Description of the reference numerals in the drawings:

[0036] 1 - movable seat; 2 - fixed seat; 201 - hanging interface; 3 - third cylinder; 4 - clamping cavity; 5 - plug-in seat; 6 - first cylinder; 7 - first clamping member; 8 - driving cavity; 9 - first connecting through groove; 10 - second clamping member; 11 - second cylinder; 12 - pushing block; 1201 - first pushing surface; 1202 - second pushing surface; 1203 - third pushing surface; 13 - second connecting through groove; 14 - third clamping member; 15 - elastic support member; 1501 - support rod; 1502 - return spring; 16 - connecting cavity; 17 - flipping block; 1701 - first end; 1702 - second end; 18 - wedge-shaped rubber block; 19 - jacking rod; 20 - linkage plate; 21 - limiting seat; 22 - steel rail; 2201 - first position; 2202 - second position; 2203 - third position; 23 - first adaptive roller; 24 - second adaptive roller; 25 - positioning seat; 26 - elastic pad; 27 - support seat. Detailed implementation manners

[0037] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0041] As Figures 1 to 10 shown, in one embodiment, a long rail welding device includes a movable seat 1 and a fixed seat 2. The movable seat 1 is slidably inserted into the fixed seat 2. The top of the fixed seat 2 further has a hanging interface 201, which is convenient for connecting an external hoisting vehicle.

[0042] A linear drive assembly is provided between the movable seat 1 and the fixed seat 2. The linear drive assembly is used to drive the movable seat 1 to move. The linear drive assembly includes a third cylinder 3. The third cylinder 3 is fixedly installed on the surface of the fixed seat 2, and the end of the piston rod of the third cylinder 3 is fixedly connected to the movable seat 1. It should be understood that during the upsetting process, when the third cylinder 3 is started, the third cylinder 3 pulls the movable seat 1, and the movable seat 1 synchronously drives one of the rails 22 to move, so that the welding ends of the rails 22 on the movable seat 1 and the welding ends of the rails 22 on the fixed seat 2 achieve upsetting.

[0043] Both the movable seat 1 and the fixed seat 2 have a clamping cavity 4, and clamping assemblies are provided in the clamping cavity 4. The clamping assemblies include:

[0044] A first clamping assembly, which is used to clamp two first positions 2201 of the rail 22. The first clamping assembly includes two socket seats 5 and two first cylinders 6. The two socket seats 5 are fixedly connected to both sides of the inner wall of the clamping cavity 4. First clamping members 7 are slidably inserted into the two socket seats 5, and the ends of the first clamping members 7 are in contact with the first positions 2201 of the rail 22. It should be understood that the first clamping members 7 will clamp the first positions 2201 of the rail 22 under the push of the first cylinders 6, so that the first positions 2201 on both sides of the rail 22 are clamped, and the concave surface of the rail 22 is positioned.

[0045] Specifically, a first adaptive roller 23 and a second adaptive roller 24 are respectively rotatably arranged on the top surface and the bottom surface of the first clamping member 7. During the process of the first clamping member 7 clamping the rail 22, the first adaptive roller 23 and the second adaptive roller 24 respectively support the top end and the bottom end of the concave surface of the rail 22, automatically centering and adjusting the position of the first clamping member 7, and preparing for the subsequent clamping of the second clamping assembly and the third clamping assembly by adjusting the position.

[0046] Two first cylinders 6 are fixedly connected to both sides of the movable seat 1 or the fixed seat 2. The piston rods of the two first cylinders 6 penetrate through the movable seat 1 or the fixed seat 2 and extend into the interior of the socket 5. The end portions of the piston rods of the two first cylinders 6 are respectively fixedly connected to the two first clamping members 7. It should be understood that during the clamping process, the first cylinders 6 are started, and the first cylinders 6 push the first clamping members 7, and the first clamping members 7 move under the support of the socket 5, providing clamping power for the first clamping members 7.

[0047] A second clamping assembly is used to clamp the second position 2202 of the rail 22. The second clamping assembly includes a driving cavity 8 opened inside the first clamping member 7. A first connecting through groove 9 is opened at the top end of the driving cavity 8. A second clamping member 10 is slidably arranged in the first connecting through groove 9. The top end of the second clamping member 10 contacts the second position 2202 of the rail 22. A pushing assembly is arranged inside the driving cavity 8. The pushing assembly includes a second cylinder 11. The end portion of the piston rod of the second cylinder 11 is fixedly connected to a pushing block 12. During the clamping process, the second cylinder 11 is started to push the pushing block 12 to press against the second clamping member 10, so that the second clamping member 10 clamps the second position 2202 of the rail 22. It should be understood that after the first clamping member 7 clamps the first position 2201 of the rail 22, the second cylinder 11 is started, and the second cylinder 11 pushes the pushing block 12, and the pushing block 12 pushes the second clamping member 10 to move until the top end of the second clamping member 10 presses against the second position 2202 of the rail 22, realizing the clamping and positioning of the second position 2202 of the rail 22;

[0048] The third clamping assembly is used to clamp the third position 2203 of the steel rail 22. The third clamping assembly includes a second connecting through groove 13 which is opened at the inner bottom end of the driving cavity 8. A third clamping member 14 is slidably arranged in the second connecting through groove 13. The bottom end of the third clamping member 14 contacts the third position 2203 of the steel rail 22. During the clamping process, the second cylinder 11 pushes the pushing block 12 to press against the third clamping member 14, so that the second clamping member 10 clamps the third position 2203 of the steel rail 22. It should be understood that during the clamping process, while the second cylinder 11 drives the pushing block 12 to press against the second clamping member 10, it also presses against the third clamping member 14. The bottom end of the third clamping member 14 presses against the third position 2203 of the steel rail 22, thereby realizing the clamping and positioning of the first position 2201, the second position 2202 and the third position 2203 of the steel rail 22, achieving multi-point clamping according to the shape characteristics of the steel rail 22, which is beneficial to maintaining the stability of the clamping, providing conditions for maintaining the relative position stability between the fixed seat 2 or the movable seat 1 and the steel rail 22 during the upsetting process, and thus resisting the acting force generated during the upsetting process.

[0049] Specifically, elastic support members 15 are arranged between the surfaces of the second clamping member 10 and the third clamping member 14 and the first clamping member 7. The elastic support member 15 includes a support seat 27 which is fixedly connected to the top or bottom surface of the first clamping member 7. The support seat 27 is slidably inserted between the second clamping member 10 or the third clamping member 14. An elastic support member 15 is fixedly connected between the support seat 27 and the second clamping member 10 or the third clamping member 14. It should be understood that when the pushing block 12 loses the acting force on the second clamping member 10 and the third clamping member 14, under the supporting action of the elastic support member 15, the second clamping member 10 and the third clamping member 14 are pulled and reset, automatically canceling the clamping and positioning of the second clamping member 10 and the third clamping member 14 on the second position 2202 and the third position 2203 of the steel rail 22 respectively.

[0050] The elastic support member 15 includes a support rod 1501 which is fixedly connected to the surface of the support seat 27 and is slidably inserted into the second clamping member 10 or the third clamping member 14. A return spring 1502 is slidably sleeved on the surface of the support rod 1501. At the position of the second clamping member 10, both ends of the return spring 1502 are fixedly connected to the support seat 27 and the second clamping member 10 respectively. At the position of the third clamping member 14, both ends of the return spring 1502 are fixedly connected to the support seat 27 and the third clamping member 14 respectively.

[0051] Such as Figures 3 to 5As shown, in one embodiment, a connection cavity 16 is formed at the end of the first clamping member 7. A positioning seat 25 is fixedly connected inside the connection cavity 16. A plurality of flipping blocks 17 are rotatably connected inside the positioning seat 25. Each of the plurality of flipping blocks 17 includes a first end 1701 and a second end 1702. A wedge-shaped rubber block 18 is fixedly connected to the first end 1701 of the flipping block 17. A pushing rod 19 is in contact with the second end 1702 of the flipping block 17. Each of the plurality of pushing rods 19 extends through the positioning seat 25 and then into the driving cavity 8. A linkage plate 20 is fixedly connected to one end of each of the plurality of pushing rods 19 located in the driving cavity 8. During the clamping process, the pushing block 12 will push the linkage plate 20 under the push of the second cylinder 11. It should be understood that during the clamping process, when the first clamping member 7 clamps the first position 2201 of the steel rail 22, it will synchronously drive the wedge-shaped rubber block 18 at the first end 1701 of the flipping block 17 to contact the first position 2201 of the steel rail 22, and make the inclined surface of the wedge-shaped rubber block 18 contact and press against the first position 2201 of the steel rail 22. After the wedge-shaped rubber block 18 is deformed, it will still generate a tendency force to overcome the displacement of the steel rail 22 relative to the first clamping member 7 during the upsetting process, which is beneficial to maintaining the further stability of the clamping;

[0052] Furthermore, during the process of the pushing block 12 pushing the second clamping member 10 and the third clamping member 14 to clamp, the pushing block 12 will push the linkage plate 20. The linkage plate 20 will synchronously drive each of the plurality of pushing rods 19 to apply a constant pressure to the second end 1702 of each of the plurality of flipping blocks 17, so that the flipping blocks 17 always maintain the acting force of flipping and pressing the wedge-shaped rubber block 18, and the tendency force generated by the deformation of the wedge-shaped rubber block 18 to overcome the displacement of the steel rail 22 relative to the first clamping member 7 during the upsetting process is enhanced, which is beneficial to maintaining the further stability of the clamping.

[0053] As Figure 4 and Figure 5 shown, in one embodiment, a plurality of limiting seats 21 corresponding to the plurality of flipping blocks 17 are also fixedly connected inside the positioning seat 25. Each of the plurality of limiting seats 21 has a limiting end. An elastic pad 26 is fixedly connected between the limiting end of the limiting seat 21 and the second end 1702 of the corresponding flipping block 17. It should be understood that when the linkage plate 20 is not pushed, under the support of the elastic pad 26, the flipping blocks 17 are kept stationary, so that the wedge-shaped rubber blocks 18 fixing the first ends 1701 of the flipping blocks 17 are maintained in the state to be clamped.

[0054] As Figure 8 shown, in one embodiment, the pushing block 12 includes a first pushing surface 1201, a second pushing surface 1202 and a third pushing surface 1203. During the clamping process, the first pushing surface 1201, the second pushing surface 1202 and the third pushing surface 1203 are respectively used to press against the second clamping member 10, the second clamping member 10 and the linkage plate 20.

[0055] As Figure 11 shown, in one embodiment, a welding method includes the following steps:

[0056] Step 1, installation: The movable seat 1 and the fixed seat 2 are respectively arranged on two steel rails 22 through an external hoisting vehicle;

[0057] Step 2, clamping treatment: The first position 2201 of the steel rail 22 is clamped by the first clamping component, the second position 2202 of the steel rail 22 is clamped by the second component, and the third position 2203 of the steel rail 22 is clamped by the third clamping component, realizing multi-point clamping;

[0058] Step 3, upsetting treatment: The movable seat 1 is driven to move by the linear drive component, and the movable seat 1 drives one of the steel rails 22 to move through the clamping component, so that the welding end of the steel rail 22 on the movable seat 1 generates upset pressure with the end of the steel rail 22 on the fixed seat 2, realizing the upsetting treatment.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A long rail welding device, comprising a movable seat (1) and a fixed seat (2), wherein the movable seat (1) is slidably plugged into the fixed seat (2), and characterized in that: A linear drive assembly is provided between the movable seat (1) and the fixed seat (2), the linear drive assembly being used to drive the movable seat (1) to move, the movable seat (1) and the fixed seat (2) both having a clamping cavity (4), the clamping cavity (4) having a clamping assembly therein, the clamping assembly being used to clamp the periphery of the rail (22), and the clamping assembly comprising a first clamping assembly, a second clamping assembly and a third clamping assembly, the first clamping assembly being used to clamp the two first positions (2201) of the rail (22); and a second clamping assembly, the second clamping assembly being used to clamp the second position (2202) of the rail (22); A third clamping assembly, the third clamping assembly being used to clamp the third position (2203) of the rail (22); The first clamping assembly comprises two sockets (5) and two first cylinders (6), the two sockets (5) being fixedly connected to two sides of the inner wall of the clamping cavity (4), the first clamping members (7) being slidably inserted in the two sockets (5), and the end of the first clamping member (7) being in contact with the first position (2201) of the rail (22); The two first cylinders (6) are fixedly connected to both sides of the movable seat (1) or the fixed seat (2), the piston rods of the two first cylinders (6) penetrate the movable seat (1) or the fixed seat (2) and extend to the inside of the plug-in seat (5), and the ends of the piston rods of the two first cylinders (6) are respectively fixedly connected to the two first clamping members (7); The second clamping assembly comprises a driving chamber (8), the driving chamber (8) being arranged inside the first clamping member (7), a first connecting groove (9) being arranged at the top end of the driving chamber (8), a second clamping member (10) being slidably arranged in the first connecting groove (9), the top end of the second clamping member (10) being in contact with a second position (2202) of the rail (22), a pushing assembly being arranged inside the driving chamber (8), the pushing assembly comprising a second cylinder (11), a pushing block (12) being fixedly connected to the end of a piston rod of the second cylinder (11), and during the clamping process, the pushing block (12) is pushed by the second cylinder (11) to press against the second clamping member (10), so that the second clamping member (10) clamps the second position (2202) of the rail (22); A connecting cavity (16) is provided at the end of the first clamping member (7). A positioning seat (25) is fixedly connected to the interior of the connecting cavity (16). A plurality of flipping blocks (17) are rotatably connected to the interior of the positioning seat (25). The plurality of flipping blocks (17) each comprise a first end (1701) and a second end (1702). The first end (1701) of the flipping block (17) is fixedly connected to a wedge-shaped rubber block (18). The second end (1702) of the flipping block (17) is contacted with a push rod (19). The plurality of push rods (19) extend into the interior of the driving cavity (8) after penetrating the positioning seat (25). A linkage plate (20) is fixedly connected to one end of the plurality of push rods (19) located in the driving cavity (8). During the clamping process, the push block (12) pushes the linkage plate (20) under the push of the second cylinder (11).

2. A long rail welding device according to claim 1, characterized in that: The third clamping assembly comprises a second connecting groove (13), the second connecting groove (13) being opened at the inner bottom end of the driving cavity (8), a third clamping member (14) being slidably arranged in the second connecting groove (13), the bottom end of the third clamping member (14) being in contact with the third position (2203) of the rail (22), and during the clamping process, the second cylinder (11) pushes the pushing block (12) to press against the third clamping member (14), so that the third clamping member (14) clamps the third position (2203) of the rail (22).

3. A long rail welding device according to claim 2, characterized in that: An elastic support member (15) is provided between the second clamping member (10) and the third clamping member (14) and the surface of the first clamping member (7); the elastic support member (15) comprises a support seat (27); the support seat (27) is fixedly connected to the top or bottom surface of the first clamping member (7); the support seat (27) is slidably plugged into the second clamping member (10) or the third clamping member (14).

4. A long rail welding device according to claim 3, characterized in that: A plurality of limit seats (21) corresponding one to one with the plurality of flip blocks (17) are also fixedly connected inside the positioning seat (25), and the plurality of limit seats (21) have limit ends, and an elastic pad (26) is fixedly connected between the limit ends of the limit seats (21) and the second ends (1702) of the flip blocks (17) at corresponding positions.

5. A long rail welding device according to claim 4, characterized in that: The linear drive assembly comprises a third cylinder (3), the third cylinder (3) being fixedly mounted on the surface of the fixed seat (2), and the end of the piston rod of the third cylinder (3) being fixedly connected to the movable seat (1).

6. A welding method, applicable to the long rail welding device according to claim 1, characterized in that: The following steps are involved: Step 1, installation: using an external lifting vehicle to respectively place the movable seat (1) and the fixed seat (2) on two steel rails (22); Step 2, clamping processing: clamping the first position (2201) of the rail (22) by a first clamping assembly, clamping the second position (2202) of the rail (22) by a second clamping assembly, and clamping the third position (2203) of the rail (22) by a third clamping assembly, thereby achieving multi-point clamping; Step three, top forging treatment, the movable seat (1) is driven to move by the linear drive component, and the movable seat (1) drives one of the rails (22) to move through the clamping component, so that the welded end of the rail (22) on the movable seat (1) and the end of the rail (22) on the fixed seat (2) are pressed against each other, thereby achieving top forging treatment.

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