Flash butt welding machine for large-section welding

Abstract

The utility model relates to the field of large-section butt welding, and discloses a large-section welding flash butt welding machine which comprises a rack, a first clamping module and a second clamping module. The first clamping module comprises a movable support, a first clamping plate assembly and a pushing mechanism. The second clamping module comprises a fixed support, a second clamping plate assembly, a clamping assembly and a positioning assembly, and the movable support and the fixed support are both installed on the rack. The first clamping plate assembly and the second clamping plate assembly respectively clamp different weldments, the side end of the weldment close to the first clamping plate assembly is limited by the pushing mechanism, and the clamping force of the weldment close to the second clamping plate assembly is improved through the clamping assembly; according to the butt welding machine, feeding is conducted from the side face of the clamping module, the non-clamped part of a weldment can extend to the outer side, large-size workpieces can be clamped conveniently, and therefore butt welding can be conducted on the large-section weldment.

Description

Technical Field

[0001] This utility model relates to the field of large-section butt welding, specifically to a flash butt welding machine for large-section welding. Background Technology

[0002] Flash butt welding is a resistance welding method. The workpieces are assembled into a butt joint, a power source is applied, and the two workpieces are brought into contact. Due to the uneven surfaces of the workpieces, initially only a few points of contact are made. As the current passes through these contact points, a large amount of resistance heat is generated, causing the metal at the contact points to rapidly melt and evaporate, forming a liquid metal bridging. As the bridging continuously bursts, metal particles are continuously ejected from between the workpieces, creating the flashing phenomenon. Simultaneously, the end faces of the workpieces are heated to a plastic state at high temperatures. Under the action of upsetting force, oxides and other impurities on the end faces of the workpieces are squeezed out, allowing the two workpieces to come into close contact, achieving atomic bonding, and thus forming a welded joint.

[0003] Large flanges used in pressure vessels or vacuum equipment, such as round flanges with a plate thickness of 20mm-100mm, a width of 50mm-250mm, and a maximum ring diameter of 4000mm, or square flanges of 4000mm×4000mm, have a maximum cross-sectional area of ​​20,000 square millimeters. During their processing, due to the excessively large welding cross-section, existing flash butt welding machines for large cross-section welding are not suitable. Therefore, the current process involves manual beveling and arc welding to fill the gap. However, this process suffers from problems such as low automation, long auxiliary time, low production efficiency, and high labor intensity. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a flash butt welding machine for large cross-section welding. The machine feeds the workpiece from the side of the clamping module, which facilitates the smooth clamping of large workpieces. After power is applied, the two parts are brought closer together, making the two workpieces come into close contact. This enables flash butt welding of large cross-section workpieces, reduces labor intensity, reduces auxiliary time, and thus improves the production efficiency of the equipment.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A flash butt welding machine for large cross-section welding includes a frame and a first clamping module and a second clamping module that can open and close relative to each other in a horizontal direction. The first clamping module includes a movable bracket, a first clamping plate assembly is provided on the front side of the movable bracket, and a pushing mechanism is provided on the side of the first clamping plate assembly opposite to the second clamping module. The second clamping module includes a fixed bracket, a second clamping plate assembly is provided on the front side of the fixed bracket, a clamping assembly is provided on the side of the second clamping plate assembly opposite to the first clamping plate assembly, and positioning components are provided on both the left and right sides of the clamping assembly. Both the movable bracket and the fixed bracket are mounted on the frame.

[0007] Optionally, the clamping assembly includes two leveling components that can open and close relative to each other in the longitudinal direction, and both the first clamping plate assembly and the second clamping plate assembly include two sets of conductive clamping plates and leveling components that can open and close relative to each other in the longitudinal direction.

[0008] Optionally, the leveling assembly includes a first support plate and a second support plate arranged opposite to each other, a wedge block is slidably installed between the first support plate and the second support plate, a leveling block that can contact the workpiece is provided above the wedge block, and the contact surface between the leveling block and the wedge block is an inclined surface; a screw is screwed through the first support plate, a guide rod is fixedly installed on the second support plate, one end of the screw is screwed into the wedge block, and one end of the guide rod is slidably embedded into the guide hole at the end of the wedge block.

[0009] Optionally, the positioning component includes a support plate connected to the fixed bracket. The support plate has a U-shaped structure, and a lead screw is rotatably mounted on the inner side of the support plate. A slider is screwed onto the lead screw, and a positioning plate is fixedly mounted on the slider.

[0010] Optionally, the pushing mechanism includes a second telescopic component mounted on the movable bracket, the output end of which is connected to a push plate that can abut against the side of the workpiece.

[0011] Optionally, the fixed bracket is fixedly installed on the frame, the movable bracket is slidably installed on the frame through a guide mechanism, and the frame is also provided with an upsetting mechanism for driving the movable bracket to move closer to or away from the fixed bracket.

[0012] Optionally, the guiding mechanism includes a guide shaft, a guide block, and a guide plate. The guide shaft is fixedly installed on both sides of the frame, the guide block is fixedly installed on the top of the frame, the front and rear sides of the lower part of the movable support are slidably sleeved on the guide shaft, the guide plate is fixedly installed on the bottom of the movable support, and a sliding groove is provided on the guide plate, the upper part of the guide block is slidably embedded in the sliding groove.

[0013] Optionally, the frame is equipped with a universal support platform for supporting the workpiece, and the front side of the frame is also provided with a support frame for supporting the workpiece.

[0014] Optionally, the frame is provided with an inclined material trough, which is located between the first clamping module and the second clamping module, and a receiving box for receiving material residue is installed at the lower end of the material trough.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) In this utility model, the first clamping plate assembly and the second clamping plate assembly clamp different welding parts respectively. The side end of the welding part near the first clamping plate assembly is limited by the pushing mechanism, while the welding part near the second clamping plate assembly is clamped by the clamping assembly to increase the clamping force and the positioning assembly to adjust its position to ensure the positional accuracy and welding quality at the joint. The welding machine feeds material from the side of the clamping module. The part of the welding part that is not clamped can extend to the outside, which is convenient for clamping large-sized workpieces. Thus, it can achieve welding for large-section welding parts, while also reducing labor intensity, reducing auxiliary time, and improving the production efficiency of the equipment.

[0017] (2) In this utility model, the clamping and conductive functions of the first clamping plate assembly and the second clamping plate assembly are arranged independently, which can ensure the clamping force while avoiding the waste of copper material;

[0018] (3) In this utility model, the clamping surface is provided with a wedge-shaped leveling component, which can adjust the height of the clamping surface to be level, ensuring the positional accuracy and welding quality of the joint, and can be adapted to workpieces of different widths through the positioning component;

[0019] (4) In this utility model, the movable bracket and the frame are slidably connected by a guide mechanism, and the guide mechanism adopts a combination of dual-axis guide and rectangular guide to improve the stability of the movable bracket movement and ensure the welding quality. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a flash butt welding machine for large cross-section welding in this embodiment of the present invention;

[0021] Figure 2 This is an isometric structural schematic diagram of a flash butt welding machine for large cross-section welding in this embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the main structure of the flash butt welding machine for large cross-section welding in this embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the guiding mechanism in an embodiment of this utility model;

[0024] Figure 5 This is a schematic diagram of the leveling component in an embodiment of this utility model;

[0025] Figure 6 This is a schematic diagram of the positioning component in an embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the pushing mechanism in an embodiment of this utility model;

[0027] Among them, 1 is the frame; 101 is the material trough; and 102 is the receiving box.

[0028] 2. First clamping module; 201. Movable bracket; 202. Guide shaft; 203. Guide block; 204. Guide plate; 3. Second clamping module; 301. Fixed bracket;

[0029] 4. Upsetting mechanism; 401. First telescopic assembly; 402. Connecting rod; 5. Conductive clamping plate;

[0030] 6. Leveling assembly; 601. First support plate; 602. Second support plate; 603. Wedge block; 604. Screw; 605. Guide rod; 606. Guide hole; 607. Leveling block;

[0031] 7. Positioning assembly; 701. Support plate; 702. Lead screw; 703. Slider; 704. Positioning plate; 705. Guide rod; 706. Handle;

[0032] 8. Pushing mechanism; 801. Second telescopic assembly; 802. Push plate;

[0033] 9. Workpiece; 10. Universal support platform; 11. Support frame. Detailed Implementation

[0034] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, a flash butt welding machine for large cross-section welding includes a frame 1, a first clamping module 2, a second clamping module 3, and an upsetting mechanism 4. The first clamping module 2 and the second clamping module 3 can open and close relative to each other in the horizontal direction under the drive of the upsetting mechanism 4, that is, open and close relative to each other in the length direction of the frame 1. The first clamping module 2 and the second clamping module 3 feed materials from the side, and the part of the workpiece 9 that is not clamped can extend to the outside, which facilitates the clamping of large-sized workpieces 9, thereby realizing flash butt welding for large cross-section workpieces 9.

[0036] Among them, workpiece 9 is usually made of multiple welded parts spliced ​​together. Taking a square flange as an example, it is composed of 4 welded parts connected end to end. When welding it using this device, the first clamping module 2 and the second clamping module 3 respectively fix and clamp two adjacent welded parts. After being powered on, the two parts are relatively close to each other, so that the two welded parts are in close contact to form a welded joint.

[0037] The unclamped portion can extend to the outside and be supported by other components, such as the universal support platform 10 and the support frame 11. The universal support platform 10 is fixedly installed on the frame 1 and located on one side of the second clamping module 3. The support frame 11 is located on the front side of the frame 1 and has rollers installed at the bottom, which can be adjusted to any position.

[0038] The universal support platform 10 includes a bracket fixedly connected to the frame 1. A support plate is fixedly installed on the top surface of the bracket, and multiple balls that can roll around their own center are provided on the support plate, so as to make it easier and more convenient to manually load large workpieces 9.

[0039] The first clamping module 2 includes a movable bracket 201, a first clamping plate assembly, and a pushing mechanism 8. The first clamping plate assembly is located on the front side of the movable bracket 201, and the pushing mechanism 8 is located on the side of the first clamping plate assembly opposite to the second clamping module 3. The first clamping plate assembly is used to clamp the weldment and conduct electricity. The output end of the pushing mechanism 8 can abut against the side of the weldment opposite to the welding surface to avoid slippage during welding.

[0040] The second clamping module 3 includes a fixed bracket 301, a second clamping plate assembly, a clamping assembly, and a positioning assembly 7. The second clamping plate assembly and the clamping assembly are both located on the front side of the fixed bracket 301, and the clamping assembly is located on the side of the second clamping plate assembly opposite to the first clamping plate assembly. The positioning assembly 7 is provided on both the left and right sides of the clamping assembly.

[0041] The second clamping plate assembly has the same structure and function as the first clamping plate assembly. Both are used to clamp the weldment and achieve electrical conductivity. The clamping assembly is mainly used to provide a large clamping force, while the positioning assembly 7 can provide a reference in the horizontal width direction for the weldment and can be adjusted to adapt to workpieces 9 of different widths, thus improving the applicability of the device.

[0042] Among them, since the workpiece 9 has a large cross-section, a large clamping force is required; the second clamping plate assembly has both conductive and clamping functions, but copper has limited compressive strength and is expensive. Under the premise of meeting the conductive cross-section, the size should be as small as possible. Therefore, the second clamping plate assembly and the clamping assembly are used together. The former is mainly responsible for conductive and has a relatively small clamping force, while the latter is a steel chuck that can output a large clamping force.

[0043] By using the second clamping plate assembly and the clamping assembly together, as well as the pushing mechanism 8 to limit the short side of the weldment, it can be ensured that the weldment will not slip during the welding process, thus ensuring stable and reliable welding quality.

[0044] Furthermore, the clamping assembly includes two leveling components 6 that can open and close relative to each other in the longitudinal direction. The first clamping plate assembly and the second clamping plate assembly have the same structure, both including two sets of conductive clamping plates 5 that can open and close relative to each other in the longitudinal direction and leveling components 6.

[0045] The conductive clamp 5 and leveling component 6 located below are fixedly installed on the movable bracket 201 and the fixed bracket 301, while the conductive clamp 5 and leveling component 6 located above are driven by the telescopic component to achieve lifting and lowering, thereby achieving the purpose of relative opening and closing along the longitudinal direction.

[0046] The telescopic assembly here preferably uses a hydraulic cylinder, and the left side view of the movable bracket 201 and the fixed bracket 301 has a C-shaped structure. The clamping assembly, the first clamping plate assembly and the second clamping plate assembly are located in its opening, which facilitates the clamping of large-sized workpieces 9. In addition, for the convenience of power supply, the conductive clamping plate 5 fixed below is connected to the circuit.

[0047] like Figure 5 As shown, the leveling assembly 6 includes a first support plate 601 and a second support plate 602 arranged opposite to each other. A wedge block 603 is slidably installed between the first support plate 601 and the second support plate 602. A leveling block 607 that can contact the workpiece 9 is provided above the wedge block 603, and the contact surface between the leveling block 607 and the wedge block 603 is an inclined surface. A screw 604 is screwed through the first support plate 601, and a guide rod 605 is fixedly installed on the second support plate 602. One end of the screw 604 is screwed into the wedge block 603, and one end of the guide rod 605 is slidably embedded in the guide hole 606 at the end of the wedge block 603.

[0048] The screw 604 and guide rod 605 are distributed at both ends of the wedge block 603 and are parallel to each other. The lower part of the wedge block 603 has a guide structure that can slide between the first support plate 601 and the second support plate 602. One end of the screw 604 is located outside the first support plate 601. By rotating the screw 604, the wedge block 603 can be driven to move. At this time, the guide rod 605 moves in or out relative to the guide hole 606. Since the contact surface between the wedge block 603 and the leveling block 607 is an inclined surface, the horizontal displacement can be converted into a vertical displacement to achieve the purpose of adjusting the height of the top surface of the leveling block 607.

[0049] Furthermore, an adjusting screw is vertically embedded in the leveling block 607. The adjusting screw passes through the leveling block 607 and is embedded in the second support plate 602. After the height is adjusted to a suitable level, tightening the adjusting screw will ensure that the position of the leveling block 607 is fixed.

[0050] like Figure 6 As shown, the positioning component 7 includes a support plate 701 connected to the fixed bracket 301. The support plate 701 adopts a U-shaped structure, and a lead screw 702 is rotatably installed on the inner side of the support plate 701. A slider 703 is screwed onto the lead screw 702, and a positioning plate 704 is fixedly installed on the slider 703.

[0051] Guide rods 705 are fixedly installed on both sides of the lead screw 702. The guide rods 705 are parallel to the lead screw 702 and pass through the slider 703. One end of the lead screw 702 extends to the outside of the support plate 701 and is fixedly installed with a handle 706. The handle 706 drives the lead screw 702 to rotate, and the slider 703 can slide along the axial direction of the guide rod 705 and the lead screw 702, thereby driving the positioning plate 704 to achieve position adjustment.

[0052] To facilitate support for the workpiece 9 and for aesthetic purposes, a cover is provided between the positioning plate 704 and the slider 703. The cover is fixedly connected to the support plate 701, while the lower part of the slider 703 protrudes between the cover and the support plate 701.

[0053] like Figure 7 As shown, the pushing mechanism 8 includes a second telescopic component 801 mounted on the movable bracket 201. The output end of the second telescopic component 801 is connected to a push plate 802 that can abut against the side of the workpiece 9. Here, the second telescopic component 801 is preferably a hydraulic cylinder.

[0054] After the material is loaded, the second telescopic component 801 drives the push plate 802 to extend, so that the push plate 802 abuts against the side of the workpiece, avoiding relative sliding of the workpiece during welding; and the push plate 802 and the workpiece 9 are of the same thickness, which can avoid bias pressure when clamping small-sized workpiece 9.

[0055] like Figure 2 , Figure 3 and Figure 4 As shown, both the movable bracket 201 and the fixed bracket 301 are mounted on the frame 1, and the fixed bracket 301 is fixedly mounted on the frame 1. The movable bracket 201 is slidably mounted on the frame 1 through a guide mechanism. The output end of the upsetting mechanism 4 mounted on the frame 1 is connected to the movable bracket 201 and is used to drive the movable bracket 201 to move closer to or away from the fixed bracket 301.

[0056] The guiding mechanism includes a guide shaft 202, a guide block 203, and a guide plate 204. The guide shaft 202 is fixedly installed on the front and rear sides of the frame 1, the guide block 203 is fixedly installed on the top of the frame 1, and the front and rear sides of the lower part of the movable bracket 201 are slidably sleeved on the guide shaft 202. The guide plate 204 is fixedly installed on the bottom of the movable bracket 201, and a sliding groove is provided on the guide plate 204. The upper part of the guide block 203 is slidably embedded in the sliding groove.

[0057] This design employs a combination of dual-axis and rectangular guides to improve the stability of the movable bracket 201's movement, ensure welding quality, and also provides automatic guide lubrication.

[0058] The upsetting mechanism 4 includes a first telescopic component 401 and a connecting rod 402. The first telescopic component 401 is mounted on the frame 1. One end of the connecting rod 402 is connected to the movable bracket 201, and the other end is connected to the output end of the first telescopic component 401. The first telescopic component 401, the guide shaft 202, the guide block 203 and the guide plate 204 are parallel to each other. The first telescopic component 401 is an upsetting hydraulic cylinder.

[0059] The upsetting mechanism 4 has a built-in displacement sensor to prevent welding slag and other materials from affecting the sensor's accuracy. The sensor directly reflects the displacement of the piston rod at the output end, avoiding additional detection errors. The connecting rod 402 and the movable bracket 201 are connected by a spherical bearing clevis to compensate for installation deviations.

[0060] In addition, the frame 1 is provided with an inclined material trough 101, which is located between the first clamping module 2 and the second clamping module 3. The lower end of the material trough 101 is connected to a receiving box 102 for receiving slag. During the welding process, weld slag and other impurities will be generated. After some of the weld slag falls off, it can slide down the material trough 101 into the receiving box 102 under the action of gravity, which is convenient for subsequent unified processing.

[0061] Working principle:

[0062] First, adjust the clamping surfaces of the first clamping module 2 and the second clamping module 3 to be aligned using the leveling component 6. Then, adjust the positioning plate 704 to a suitable position using the positioning component 7 according to the width of the workpiece 9.

[0063] One section of the weldment is placed between the clamping surfaces of the second clamping plate assembly and the clamping assembly in a direction parallel to the length of the frame 1, and the unclamped part is supported by the universal support table 10; then another section of the weldment is placed between the clamping surfaces of the first clamping plate assembly in a direction perpendicular to the length of the frame 1, and the push plate 802 is driven by the push mechanism 8 to abut against the side of the weldment.

[0064] Subsequently, the first clamping plate assembly, the second clamping plate assembly, and the clamping assembly respectively fix and clamp the corresponding weldment; wherein the conductive clamping plates 5 of the first clamping plate assembly and the second clamping plate assembly are energized, and the upsetting mechanism 4 drives the movable bracket 201 to approach the fixed bracket 301 along the guide shaft 202 and the guide block 203, so that the two weldment sections are in close contact, achieving atomic bonding, thereby forming a welded joint.

[0065] During the welding process, the weld slag that is produced will fall down along the material trough 101 into the receiving box 102 for convenient subsequent unified processing.

[0066] In summary, this utility model proposes a flash butt welding machine for large cross-section welding. It adopts a hydraulic drive system and a variable frequency AC welding power supply. The long flange is driven independently by dual hydraulic cylinders for both conduction and clamping, ensuring both the conductive cross-section and the welding clamping force. A wedge-shaped leveling device is used to ensure that the clamping surfaces are at the same height. The short flange side is driven by a hydraulic cylinder for conductive clamping. A jacking device is added to one side of the workpiece to ensure that the welding does not slip. It has the advantages of shortening auxiliary time, reducing labor intensity, realizing automated operation, improving production efficiency, and reducing production costs.

[0067] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0068] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0069] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A large cross-section flash butt welding machine characterized by: Including frame (1) and first clamping module (2) and second clamping module (3) can be opened and closed along the horizontal direction, the first clamping module (2) includes movable support (201), the front side of movable support (201) is provided with first clamping plate assembly, the first clamping plate assembly is provided with push mechanism (8) on the side away from the second clamping module (3), The second clamping module (3) includes fixed support (301), the front side of fixed support (301) is provided with second clamping plate assembly, the second clamping plate assembly is provided with clamping assembly on the side away from the first clamping plate assembly, the left and right sides of the clamping assembly are provided with positioning assembly (7), and the movable support (201) and the fixed support (301) are installed on the frame (1).

2. A large cross-section welded flash butt welder as claimed in claim 1, characterised in that: The clamping assembly includes two leveling assemblies (6) capable of being opened and closed along the longitudinal direction, and the first clamping plate assembly and the second clamping plate assembly each include two groups of conductive clamping plates (5) and leveling assemblies (6) capable of being opened and closed along the longitudinal direction.

3. A large cross section welded flash butt welder as claimed in claim 2 characterised in that: The leveling assembly (6) includes oppositely arranged first branch plate (601) and second branch plate (602), the wedge block (603) is slidably installed between the first branch plate (601) and the second branch plate (602), the wedge block (603) is provided with leveling block (607) capable of contacting workpiece (9) above, and the contact surface of the leveling block (607) and the wedge block (603) is inclined surface. The screw rod (604) is screwed through and arranged on the first branch plate (601), the guide rod (605) is fixedly installed on the second branch plate (602), one end of the screw rod (604) is screwed into the wedge block (603), and one end of the guide rod (605) is slidably embedded in the guide hole (606) at the end of the wedge block (603).

4. The large cross-section welded flash butt welder of claim 1, wherein: The positioning assembly (7) includes support plate (701) connected with the fixed support (301), the support plate (701) adopts U-shaped structure, and the inner side of the support plate (701) is rotatably installed with screw rod (702), the sliding block (703) is rotatably arranged on the screw rod (702), and the positioning plate (704) is fixedly installed on the sliding block (703).

5. The large cross-section welded flash butt welder of claim 1, wherein: The push mechanism (8) includes the second telescopic assembly (801) installed on the movable support (201), and the output end of the second telescopic assembly (801) is connected with the push plate (802) capable of abutting against the side surface of the workpiece (9).

6. The large cross-section welded flash butt welder of claim 1, wherein: The fixed support (301) is fixedly installed on the frame (1), the movable support (201) is slidably installed on the frame (1) through the guide mechanism, and the frame (1) is further provided with the top forging mechanism (4) for driving the movable support (201) to approach or move away from the fixed support (301).

7. A large cross section welded flash butt welder as claimed in claim 6 wherein: The guide mechanism comprises a guide shaft (202), a guide block (203) and a guide plate (204), the guide shaft (202) is fixedly installed on both sides of the rack (1), the guide block (203) is fixedly installed on the top of the rack (1), the front and rear sides of the lower part of the movable support (201) are slidably sleeved on the guide shaft (202), the guide plate (204) is fixedly installed on the bottom of the movable support (201), and a sliding groove is formed in the guide plate (204), and the upper part of the guide block (203) is slidably embedded in the sliding groove.

8. The large cross-section welded flash butt welder of claim 1, wherein: A universal support table (10) for supporting the workpiece (9) is installed on the rack (1), and a support frame (11) for supporting the workpiece (9) is further arranged on the front side of the rack (1).

9. The large cross section welded flash butt welder of claim 1 wherein: An inclined chute (101) is formed in the rack (1), the chute (101) is located between the first clamping module (2) and the second clamping module (3), and a receiving box (102) for receiving slag is connected to the lower end of the chute (101).

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