Gantry welding device

Abstract

The utility model belongs to the submerged-arc welding technical field especially relates to a portal welding device. A portal welding device, including portal frame, the portal frame includes support frame and crossbeam, is horizontally fixedly connected with the guide rail on the crossbeam, and the crossbeam extension part is arranged in butt joint to the crossbeam end of support frame outside, the guide rail extends to the crossbeam extension part on, at least one welding arm is driven by horizontal drive mechanism and is slid on the guide rail, the welding arm can slide to the crossbeam extension part through the crossbeam, the welding frame is fixedly connected to the lower part of welding arm, and the welding torch fine adjustment mechanism is arranged on the welding frame, the welding torch fine adjustment mechanism includes the screw rod drive mechanism set up on the welding frame, the clamping block of fixedly clamping the welding torch, the clamping block is fixedly connected on the sliding block of screw rod drive mechanism. The utility model overcomes the internal dimension of portal frame limited and leads to the workpiece of larger size that cannot be welded and high welding efficiency, can carry out the horizontal fine adjustment to the welding torch.

Description

Technical Field

[0001] This utility model belongs to the field of submerged arc welding technology, and in particular relates to a gantry welding device. Background Technology

[0002] Gantry-type automatic submerged arc welding machines are mainly used for submerged arc welding of L-shaped and H-shaped steel. They have advantages such as high automation and simple and convenient operation. For an existing gantry-type automatic submerged arc welding machine, please refer to [reference 1]. Figure 7 As shown, it includes a gantry 12 driven by a gantry drive mechanism 11 to slide on a slide rail, at least one vertically arranged welding arm 14 that slides horizontally on the crossbeam of the gantry 12 driven by a horizontal drive mechanism 13, a longitudinal drive mechanism 15 that drives the welding arm 14 to slide in the vertical direction, and also includes welding mechanisms such as a wire feeding mechanism 16, a flux delivery mechanism 17, a welding torch 18, etc., and a controller 19, etc.

[0003] When performing submerged arc welding on L-shaped and H-shaped steel workpieces 2, the existing gantry-type automatic submerged arc welding machine places the bracket 3 inside the gantry frame 12 and places the workpiece 2 to be processed on the bracket 3. The welding arm 14 moves to above the workpiece 2 to be welded under the drive of the horizontal drive mechanism 13. The welding arm 14 moves towards the workpiece 2 to be welded under the drive of the longitudinal drive mechanism 15 and aligns with the position of the workpiece 2 to be submerged arc welded. The flux delivery mechanism 17 delivers flux to the welding area, the wire feeding mechanism 16 delivers welding wire to the welding gun 18, and the gantry drive mechanism 11 drives the gantry frame 12 to move along the length of the workpiece 2 to perform submerged arc welding on the workpiece 2.

[0004] The aforementioned existing gantry-type automatic submerged arc welding machines can be found in Chinese Utility Model Patent No. CN219648911U, entitled "A Gantry-type Submerged Arc Welding Machine," and Chinese Invention Patent No. CN112091361B, entitled "H-beam Welding Method for High-Efficiency H-beam Production Line." Existing gantry-type automatic submerged arc welding machines encounter the following technical problems during use: 1. Since the dimensions of the gantry frame are fixed, to improve welding efficiency, two welding arms 14 are generally set on the gantry frame 12 to weld two sets of workpieces 2, such as... Figure 7As shown, when the size of workpiece 2 is large, a larger bracket 3 is required. The space inside the gantry 12 cannot accommodate two brackets 3, thus making it impossible to process two sets of workpieces 2 simultaneously, thereby reducing processing efficiency. In addition, when it is necessary to replace the bracket 3 inside the gantry 12, the replacement is complicated and time-consuming due to the large size of the bracket 3. 2. During the process of aligning the welding torch 18 with the position to be welded on workpiece 2, the welding arm 14 is generally moved by the horizontal drive mechanism 13. There is a lack of a horizontal fine-tuning structure for the welding torch 18. When the operator bends down to align the welding torch 18, it is not easy to achieve accurate alignment when operating the horizontal drive mechanism 13 by remote control, and the welding arm 14 is prone to causing bumps to the operator. Utility Model Content

[0005] To address at least one technical problem in the prior art, this application provides a gantry welding device that overcomes the limitation of the internal dimensions of the gantry frame, which prevents the welding of larger workpieces, and offers high welding efficiency and allows for horizontal fine-tuning of the welding torch.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A gantry welding device includes a gantry frame, which includes a support frame and a crossbeam mounted on the support frame. A guide rail is horizontally fixedly connected to the crossbeam. An extension portion of the crossbeam is abutted at the end of the crossbeam on the outer side of the support frame, and the guide rail extends to the extension portion of the crossbeam. At least one welding arm is slidably mounted on the guide rail and driven by a horizontal drive mechanism. The welding arm can slide along the crossbeam to the extension portion of the crossbeam. A welding frame is fixedly connected to the lower part of the welding arm, and a welding torch fine-tuning mechanism is mounted on the welding frame. The welding torch fine-tuning mechanism includes a screw drive mechanism mounted on the welding frame and a clamping block for fixing and holding the welding torch. The clamping block is fixedly connected to the slider of the screw drive mechanism.

[0007] Preferably, the screw drive mechanism includes a fixed block vertically fixedly connected to the welding frame, a groove is formed on the vertical end face of the fixed block, a stop block is fixedly connected to one end of the groove, a slider is slidably embedded in the groove, a screw is rotatably inserted in the stop block and threadedly connected to the slider, the screw is axially limited by an axial limiting component; a sliding plate is fixedly connected to the slider, and the clamping block is fixedly connected to the sliding plate.

[0008] Preferably, a knob is fixedly connected to the screw on the outside of the stop block.

[0009] Preferably, guide protrusions are provided on the upper and lower end faces of the fixed block along its length direction, and guide grooves matching the guide protrusions are provided on the end face of the sliding plate opposite to the fixed block, with the guide protrusions embedded in the guide grooves.

[0010] Preferably, the clamping block has a clamping through hole and a clamping through groove that connects the clamping through hole to the outside in a vertical direction. The welding torch is inserted into the clamping through hole, and the fastening bolts are threaded into the clamping blocks on both sides of the clamping through groove to fix the welding torch in the clamping block.

[0011] Preferably, the welding frame includes a connecting frame mounted on the welding arm and a fixed frame with an internally hollow rectangular cross-section structure fixedly connected to the connecting frame. The lower part of the fixed frame is a hollow structure, and guide wheels are rotatably connected to the lower part of the fixed frame. Two sets of guide wheels are arranged in front and behind and are rotatably mounted in the hollow structure.

[0012] Preferably, a mounting plate is fixedly connected to the inner end face of the fixing frame. The mounting plate has a C-shaped structure. The fixing block is fixedly connected to the mounting plate. The welding gun is inserted into the hollow structure of the fixing frame between the two guide wheels.

[0013] Preferably, fixed cylinders are fixedly connected to both sides of the fixed frame, and the flux conveying pipe and the flue gas absorption pipe of the flux conveying mechanism are fixedly connected to the corresponding fixed cylinders.

[0014] Preferably, two ring-shaped plates with a ring-shaped structure are fixedly connected to the side of the fixed frame on the side where the flux delivery pipe is set, and the flux delivery pipe is fixed in the fixed cylinder after being inserted into the two ring-shaped plates.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model expands the working range of the welding arm by adding an extended section to the outer side of the crossbeam of the gantry frame, allowing welding stations to be set up on the outer side of the gantry frame as well. This enables multiple workpieces to be arranged simultaneously on both the inner and outer sides of the gantry frame, and is particularly capable of accommodating and welding large workpieces that cannot be placed inside a traditional gantry frame due to their excessive size. This achieves parallel operation of multiple stations and improves the overall welding production efficiency.

[0016] 2. This utility model features an independent welding torch fine-tuning mechanism for each welding arm. This mechanism uses a lead screw drive, allowing precise micro-movements of the welding torch in the horizontal direction by rotating a knob. This ensures high adjustment accuracy and stable, reliable operation. It eliminates the need for operators to rely on large-scale movements of the gantry or welding arm to achieve final alignment, reducing the risk of the operator being bumped or knocked by the welding arm during close-range adjustments, and improving operational safety, ease of alignment, and accuracy. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the connection structure of the welding arm, welding frame, and welding torch fine-tuning mechanism of this utility model.

[0019] Figure 3 for Figure 2 A side view structural diagram.

[0020] Figure 4 This is a schematic diagram of the connection structure of the welding frame and welding torch fine-tuning mechanism of this utility model.

[0021] Figure 5 This is a schematic diagram of the welding torch fine-tuning mechanism of this utility model.

[0022] Figure 6 for Figure 5 A side view structural diagram.

[0023] Figure 7 This is a structural schematic diagram of an existing gantry-type automatic submerged arc welding machine.

[0024] In the diagram: 1. Gantry-type automatic submerged arc welding machine; 11. Gantry drive mechanism; 12. Gantry; 121. Support frame; 122. Crossbeam; 123. Guide rail; 124. Crossbeam extension; 13. Horizontal drive mechanism; 14. Welding arm; 15. Longitudinal drive mechanism; 16. Wire feeding mechanism; 17. Flux delivery mechanism; 171. Flux delivery pipe; 18. Welding torch; 19. Controller; 20. Fume extraction mechanism; 201. Fume extraction pipe. 2. Workpiece 3. Bracket, 41. Welding frame; 42. Reinforcing plate; 43. Connecting frame; 44. Fixing frame; 45. Guide wheel; 46. Fixing cylinder; 47. Locking bolt; 48. Circumferential plate; 49. Mounting plate. 5. Welding torch fine-tuning mechanism; 51. Clamping block; 511. Vertical plate; 512. Horizontal plate; 513. Clamping through hole; 514. Clamping through groove; 515. Fastening bolt; 52. Screw drive mechanism; 521. Fixing block; 5211. Guide protrusion; 522. Slide groove; 523. Stop block; 524. Slider; 525. Screw; 526. Axial limiting assembly; 527. Knob; 528. Sliding plate; 5281. Guide groove. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model. Example

[0027] See appendix Figure 1 As shown, a gantry welding device includes a gantry frame 12. The gantry frame 12 includes two N-shaped support frames 121 arranged opposite each other and a crossbeam 122 fixedly connected to the upper surface of the two support frames 121. The crossbeam 122 is arranged horizontally.

[0028] To address the problem mentioned in the background art of limited internal space in the gantry 12, which prevents the simultaneous welding of multiple large-sized workpieces, this embodiment improves the crossbeam 122: a guide rail 123 is horizontally fixedly connected to one vertical side of the crossbeam 122 by bolts. Specifically, an extended crossbeam portion 124 is fixedly connected to the end of the crossbeam 122 on the outer side of at least one support frame 121. Specifically, the extended crossbeam portion 124 and the crossbeam 122 have the same rectangular cross-sectional structure, their end faces are aligned, and they are fixedly connected by welding to form an integral structure. The guide rail 123 also extends and is fixedly connected to the upper surface of the extended crossbeam portion 124, so that the guide rail 123 on the crossbeam 122 and the guide rail 123 on the extended crossbeam portion 124 together form a continuous guide track. At least one welding arm 14 slides on the guide rail 123 and is driven by a horizontal drive mechanism 13, and the welding arm 14 can slide from the crossbeam 122 to the extended crossbeam portion 124. By providing the crossbeam extension 124, the sliding range of the welding arm 14 is expanded, allowing it to slide from the crossbeam 122 region inside the support frame 121 to the crossbeam extension 124 region outside the support frame 121. In a preferred embodiment, see [reference needed]. Figure 1 As shown, the guide rail 123 is a continuous long guide rail on which three welding arms 14, independently driven by a horizontal drive mechanism 13, are mounted. Two of the welding arms 14 are mainly movable below the crossbeam 122 on the inner side of the support frame 121, and are used to weld the workpiece 2 placed on the inner bracket 3 of the gantry frame; the other welding arm 14 is mainly movable below the extended portion 124 of the crossbeam on the outer side of the support frame 121, and is used to weld the larger workpiece 2 placed on the outer bracket 3. This allows for the simultaneous welding of three sets of workpieces, significantly improving equipment utilization and welding efficiency.

[0029] Of course, in one embodiment, in order to modify the existing gantry automatic submerged arc welding machine 1, the guide rail 123 on the crossbeam 122 and the guide rail 123 on the extended part of the crossbeam 124 are not integrally formed or are not aligned at the end. That is, an independently operating welding arm 14 is provided on the extended part of the crossbeam 124 on the outside of the support frame 121, and at least one welding arm 14 is provided on the crossbeam 122 on the inside of the support frame 121.

[0030] It should be noted that the gantry welding device is equipped with a gantry frame drive mechanism 11 for driving the gantry frame 12 to slide along the length of the workpiece 2, a horizontal drive mechanism 13 for driving the welding arm 14 to slide along the guide rail 123, a longitudinal drive mechanism 15 for driving the welding arm 14 to slide up and down, a wire feeding mechanism 16 for feeding welding wire, a flux feeding mechanism 17 for feeding flux, a fume extraction mechanism 20 for extracting welding fumes, and a controller 19 for controlling the above mechanisms. All of these are existing technologies, and their working principles and specific structures are existing technologies, which will not be described in detail here.

[0031] See Figure 2 , 3 As shown, to solve the problem of difficulty in precise alignment after the initial positioning of the welding torch 18, a welding frame 4 is fixedly connected to the lower part of each welding arm 14, and a welding torch fine-tuning mechanism 5 is provided on the welding frame 4. The welding torch fine-tuning mechanism 5 includes a screw drive mechanism 52 set on the welding frame 4 and a clamping block 51 for fixing and holding the welding torch 18. The clamping block 51 is fixedly connected to the slider of the screw drive mechanism 52. By operating the screw drive mechanism 52, the slider 524, together with the clamping block 51 and the welding torch 18, can be driven to perform precise reciprocating micro-movements in the horizontal direction, thereby realizing the fine adjustment of the position of the welding torch 18.

[0032] See Figure 4 As shown, the welding frame 4 includes a reinforcing plate 41 that is fixedly connected to or welded to the side of the welding arm 14 by bolts. A connecting frame 42 is fixedly connected to the reinforcing plate 41 by bolts. The connecting frame 42 has a U-shaped structure. The bottom of the U-shaped structure of the connecting frame 42 is fixedly connected to the reinforcing plate 41 by bolts. The two protruding ends of the U-shaped structure of the connecting frame 42 are welded to the fixing frame 43. The fixing frame 43 has a hollow rectangular cross-section structure. The lower part of the fixing frame 43 has a hollow structure along its length. Fixing shafts (not shown in the drawings) are horizontally fixedly inserted on the fixing frames 43 on both sides of the hollow structure. Guide wheels 44 are rotatably connected to the fixing shafts. Two sets of fixing shafts and guide wheels 44 are arranged in front and behind, and the guide wheels 44 are rotatably arranged in the hollow structure. The lower part of the guide wheels 44 is lower than the lower end face of the fixing frame 43. The axis of the fixing shaft is perpendicular to the sliding direction of the gantry frame 12. The outer diameter of the middle part of the guide wheel 44 is smaller than the outer diameter of its two sides.

[0033] Fixing cylinders 45 are welded to the front and rear vertical sides of the fixing frame 43, respectively. The inner cavity of the fixing cylinder 45 is circular or square. The flux delivery pipe 171 of the flux delivery mechanism 17 and the flue gas absorption pipe 201 of the flue gas absorption mechanism 20 are respectively inserted into the inner cavity of the two fixing cylinders 45. In order to fix the flux delivery pipe 171 and the flue gas absorption pipe 201, locking bolts 46 are fixedly connected to the outer side of the two fixing cylinders 45, respectively. After tightening the locking bolts 46, the corresponding locking bolts 46 located in the inner cavity of the fixing cylinder 45 respectively abut against the flux delivery pipe 171 and the flue gas absorption pipe 201, thereby fixing the two inside the fixing cylinder 45.

[0034] To further stabilize the flux delivery pipe 171 and prevent it from affecting flux delivery due to shaking, since the flux delivery pipe 171 needs to transport flux, in this embodiment, to avoid the flux delivery pipe 171 located above the fixed cylinder 45 bending or shaking excessively, thus causing poor flux delivery, two ring-shaped plates 47 with a ring structure are bolted to the side of the fixed frame 43 on the side where the flux delivery pipe 171 is located. The flux delivery pipe 171 is inserted into the ring cavity formed by the two ring-shaped plates 47, and the flux delivery pipe 171 cannot detach from the gap between the two ring-shaped plates 47. In addition, the flue gas absorption pipe 201 is vertically inserted into and fixed in the fixed cylinder 45 via the connecting frame 42. A wire feeding mechanism 16 is fixedly connected to the upper end face of the fixed frame 43. The welding torch 18 is located in the inner cavity of the fixed frame 43. The wire feeding mechanism 16 passes the welding wire through the fixed frame 43 and delivers it to the welding torch 18. The structure and working principle of the wire feeding mechanism 16 are existing technologies.

[0035] See Figure 5 , 6 As shown, a mounting plate 48 is welded to the inner end face of the fixing frame 43. The mounting plate 48 has a C-shaped structure. The two horizontal ends of the mounting plate 48 are welded to the inner end face of the fixing frame 43. The screw transmission mechanism 52 of the welding gun fine adjustment mechanism 5 is fixedly connected to the vertical end face of the mounting plate 48.

[0036] The lead screw drive mechanism 52 includes a fixing block 521 that is vertically welded or bolted to the vertical end face of the mounting plate 48. A through-groove 522 is formed on the vertical end face of the fixing block 521 facing away from the mounting plate 48, with the length direction of the groove 522 perpendicular to the sliding direction of the gantry frame 12. A stop block 523 is welded to one end of the groove 522, and the stop block 523 can be embedded within the groove 522. A slider 524 is slidably embedded within a groove 522. A screw 525 is rotatably inserted into a stop block 523 and threadedly connected to the slider 524. The screw 525 is axially limited by an axial limiting component 526, meaning that the screw 525 can only rotate within the stop block 523 and cannot move along its length beyond the allowable axial movement error. The axial limiting component 526 may include a bearing fixedly embedded within the stop block 523, with the screw 525 fixedly inserted into the inner ring of the bearing. Alternatively, baffles may be fixedly connected to the screw 525 on both the inner and outer sides of the stop block 523. The axial limiting component 526 is prior art and will not be described further here. A knob 527 is fixedly connected to the screw 525 on the outer side of the stop block 523.

[0037] A sliding plate 528 is bolted to the slider 524, and a clamping block 51 is welded or bolted to the sliding plate 527. When the knob 527 rotates, it drives the screw 525 to rotate, which in turn drives the slider 524 to slide along the length of the groove 522. To ensure smooth and precise sliding of the slider 524 and the sliding plate 528, a guide protrusion 5211 is integrally formed on the inner side of the upper and lower end faces of the fixing block 521 along its length. A guide groove 5281 matching the guide protrusion 5211 is formed on the end face of the sliding plate 528 opposite to the fixing block 521. The guide protrusion 5211 can be slidably embedded in the guide groove 5281. The guide groove 5281 can be an existing dovetail groove structure, with the guide protrusion 5211 matching the guide groove 5281.

[0038] The clamping block 51 is fixed on the sliding plate 528. The clamping block 51 includes a vertical plate 511 fixed to the end face of the sliding plate 528 away from the fixed block 521 by bolts or welding, and a horizontal plate 512 horizontally fixedly connected to the vertical plate 511. Two sets of horizontal plates 512 are arranged parallel to each other vertically. A clamping through hole 513 and a clamping through groove connecting the inside of the clamping through hole 513 and the outside space of the horizontal plate 512 are formed in the vertical direction on the horizontal plate 512. 514, the clamping through groove 514 passes through the upper and lower end faces of the horizontal plate 512, the welding torch 18 is inserted into the clamping through hole 513, the fastening bolt 515 is rotatably inserted into the horizontal plate 512 on one side of the clamping through groove 514 and threadedly connected to the horizontal plate 512 on the other side of the clamping through groove 514. As the fastening bolt 515 is tightened, the horizontal plates 512 on both sides of the clamping through groove 514 can clamp the welding torch 18, so that the welding torch 18 is fixed in the clamping block 51.

[0039] The working principle and process of this embodiment are as follows: 1. Workpiece placement: Place two standard brackets 3 inside the support frame 121 respectively, and place a larger bracket 3 (which can be selected according to the size of the workpiece 2) under the extended part 124 of the crossbeam outside the support frame 121. The bracket 3 under the extended part 124 of the crossbeam is larger and is used to place larger workpieces 2 that cannot be placed under the crossbeam 122. Place workpieces 2, such as L-shaped and H-shaped steel that have been spot-welded, on the three brackets 3 respectively. 2. Preliminary positioning: The controller 19 controls the horizontal drive mechanism 13 to drive each welding arm 14 to move above the workpiece 2 and initially align it with the part of the workpiece 2 to be welded. The controller 19 controls the vertical drive mechanism 15 to drive each welding arm 14 to move downward to close to the part of the workpiece 2 to be welded, and the guide wheels 44 abut against both sides of the part of the workpiece 2 to be welded for guidance during welding. 3. Precise alignment: Based on the deviation between the welding torch 18 and the part of the workpiece 2 to be welded, the operator rotates the knob 527, which in turn drives the slider 524, the sliding plate 528, the clamping block 51 and the welding torch 18 to move synchronously along the length of the slide groove 522, so that the welding torch 18 and the part of the workpiece 2 to be welded are precisely aligned. 4. Welding Operation: The flux delivery mechanism 17 delivers flux to the workpiece 2 to be welded via the flux delivery pipe 171. The wire feeding mechanism 16 feeds welding wire to the welding torch 18. The fume extraction mechanism 20 creates a negative pressure in the fume extraction pipe 201. The controller 19 controls the welding torch 18 to start welding, and the gantry drive mechanism 11 drives the gantry 12 to slide along the length of the workpiece 2, thereby automatically welding the workpiece 2. During the welding process, the fume extraction mechanism 20 extracts the fumes generated during welding through the fume extraction pipe 201. The guide wheel 44 rolls along the surface of the workpiece, providing stability and guidance.

[0040] It should be noted that the flux delivery pipe 171 is located in front of the welding torch 18, that is, the flux is first delivered to the part of the workpiece 2 to be welded before the welding torch 18 performs welding.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gantry welding device, comprising a gantry frame, the gantry frame including a support frame and a crossbeam disposed on the support frame, characterized in that: A guide rail is horizontally fixedly connected to the crossbeam, and an extension part of the crossbeam is provided at the end of the crossbeam on the outside of the support frame, with the guide rail extending to the extension part of the crossbeam. At least one welding arm is slidably mounted on a guide rail and driven by a horizontal drive mechanism, and the welding arm can slide to the extended part of the crossbeam via a crossbeam. A welding frame is fixedly connected to the lower part of the welding arm, and a welding gun fine-tuning mechanism is provided on the welding frame; The welding torch fine-tuning mechanism includes a screw drive mechanism mounted on the welding frame and a clamping block for fixing and holding the welding torch. The clamping block is fixedly connected to the slider of the screw drive mechanism.

2. The gantry welding device according to claim 1, characterized in that: The lead screw transmission mechanism includes a fixed block vertically fixedly connected to the welding frame. A groove is formed on the vertical end face of the fixed block. A stop block is fixedly connected to one end of the groove. A slider is slidably embedded in the groove. The screw is rotatably inserted through the stop block and threadedly connected to the slider. The screw is axially limited by an axial limiting component. A sliding plate is fixedly connected to the slider, and the clamping block is fixedly connected to the sliding plate.

3. The gantry welding device according to claim 2, characterized in that: A knob is fixedly connected to the screw on the outside of the stop block.

4. The gantry welding device according to claim 2, characterized in that: Guide protrusions are provided on the upper and lower end faces of the fixed block along its length direction, and guide grooves matching the guide protrusions are provided on the end face of the sliding plate opposite to the fixed block, with the guide protrusions embedded in the guide grooves.

5. The gantry welding device according to claim 1, characterized in that: A clamping through hole and a clamping through groove are provided on the clamping block along the vertical direction. The welding torch is inserted into the clamping through hole, and the fastening bolts are threaded into the clamping blocks on both sides of the clamping through groove to fix the welding torch in the clamping block.

6. The gantry welding device according to claim 2, characterized in that: The welding frame includes a connecting frame mounted on the welding arm and a fixed frame with an internally hollow rectangular cross-section structure fixedly connected to the connecting frame. The lower part of the fixed frame is a hollow structure, and guide wheels are rotatably connected to the lower part of the fixed frame. Two sets of guide wheels are arranged in front and behind and are rotatably mounted in the hollow structure.

7. The gantry welding device according to claim 6, characterized in that: An mounting plate is fixedly connected to the inner end face of the fixed frame. The mounting plate has a C-shaped structure. The fixing block is fixedly connected to the mounting plate. The welding gun is inserted into the hollow structure of the fixed frame between the two guide wheels.

8. The gantry welding device according to claim 6, characterized in that: Fixed cylinders are fixedly connected to both sides of the fixed frame, and the flux conveying pipe and the flue gas absorption pipe of the flux conveying mechanism are fixedly connected to the corresponding fixed cylinders.

9. The gantry welding device according to claim 8, characterized in that: Two ring-shaped plates with a ring-shaped structure are fixedly connected to the side of the fixed frame on the side where the flux delivery pipe is set. The flux delivery pipe is inserted into the two ring-shaped plates and then fixed in the fixed cylinder.

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