High-temperature-resistant submerged-arc welding gun device for surfacing repair of large roller

Abstract

The utility model relates to the technical field of large roller surfacing, in particular to a high-temperature-resistant submerged-arc welding gun device for large roller surfacing repair, which comprises a welding flux blanking hose, a welding flux blanking steel pipe, a wire feeding system, a conducting rod, a heat insulation mechanism, a heat preservation box, a blanking positioning mechanism, a three-way diverter, a contact tube and a contact tube protection sleeve, the heat insulation mechanism comprises a steel plate shell and heat insulation fire-resistant cotton, the steel plate shell is horizontally arranged between the heat preservation box cover and the wire feeding system, the heat insulation fire-resistant cotton is arranged on the side, facing the wire feeding system, of the steel plate shell, and the welding flux discharging positioning mechanism is arranged on the outer circumference of a conducting rod in the heat preservation box. The surfacing welding device has the advantages that the surfacing welding device can go deep into a high-temperature heat preservation furnace for surfacing welding, and the stability of welding bead forming in the surfacing welding process is improved.

Description

Technical Field

[0001] This utility model relates to the field of large roll surfacing technology, and in particular to a high-temperature submerged arc welding gun device for large roll surfacing repair. Background Technology

[0002] Large roll surfacing repair involves multi-layer, multi-pass welding with large area and thickness. Welding stress accumulates layer by layer, which can easily cause cracks and defects during the surfacing process, thus affecting the repair quality. Therefore, large roll surfacing requires preheating and interlayer insulation in a heating and holding furnace to reduce welding stress. However, existing submerged arc welding gun devices have the following shortcomings: (1) Although surfacing in the holding furnace can be achieved by extending the conductive rod of the submerged arc welding head, the heat radiation in the holding furnace will damage the wire feeding system, making it impossible to weld continuously for a long time. (2) There is a lack of insulation between the flux feeding pipe and its connecting device and the conductive rod. During long-term welding, current shunting will lead to unstable surfacing quality. (3) The conductive nozzle protective sleeve is cylindrical with a flat bottom, while the surfacing weld bead is a raised arc shape. The bottom surface of the protective sleeve often scratches the weld bead, causing weld bead deformation and damage, affecting the weld bead forming quality.

[0003] Patent CN219900608U, "A Large BD Roll Repair Device," discloses a large BD roll repair device in which the submerged arc welding torch is placed outside the insulation box to reduce the damage of heat radiation to the wire feeding motor of the submerged arc welding machine head. However, this setup requires exposing the arc portion of the roll outside the insulation furnace, which is not conducive to the insulation between weld layers during the welding process. This not only increases welding stress but also affects the cladding metal structure of the weld layer, thereby leading to cracking of the weld layer or reducing the performance of the repaired roll.

[0004] Patent CN220943617U, "A Compact Long-Barrel High-Power Water-Cooled Welding Gun," discloses an automatic submerged arc welding water-cooled welding gun. It features a heat insulation plate above a conductive copper busbar, with a water pipe connection plate mounted on the heat insulation plate. The water pipe connection plate has an inlet pipe and an outlet pipe. This welding gun can extend into a holding furnace to complete continuous welding operations. However, the addition of a water-cooling device makes the welding equipment more complex, increasing maintenance costs and difficulty.

[0005] Therefore, those skilled in the art are dedicated to developing a high-efficiency, stable and easy-to-maintain welding torch that can be inserted into the roll holding furnace at a high temperature of 350–450°C to complete continuous welding operations. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, this utility model provides a high-temperature submerged arc welding gun device for the surfacing repair of large rolls. This device can not only penetrate deep into the high-temperature holding furnace for surfacing, but also significantly improves the stability of weld formation during the surfacing process through structural improvements. It is particularly suitable for large-area surfacing applications of cylindrical rotating bodies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-temperature submerged arc welding gun device for surfacing repair of large rolling mill rolls includes a flux feeding hose, a flux feeding steel pipe, a wire feeding system, a conductive rod, a heat insulation mechanism, an insulation box, a feeding positioning mechanism, a three-way distributor, a conductive nozzle, and a conductive nozzle protective sleeve. The flux feeding hose extends into the flux feeding steel pipe. The heat insulation mechanism includes a steel plate shell and heat-insulating refractory cotton. The steel plate shell is horizontally positioned between the insulation box cover and the wire feeding system. The flux feeding steel pipe and the conductive rod pass through the steel plate shell and extend into the insulation box. The side of the steel plate shell facing the wire feeding system is provided with heat-insulating refractory cotton. The flux feeding and positioning mechanism is set on the outer circumference of the conductive rod inside the insulation box. Two fixed sleeves are set on the oblique side of the flux feeding and positioning mechanism to connect the flux feeding steel pipe. The flux feeding and positioning mechanism makes the flux feeding steel pipe and the conductive rod form an angle of 25° to 45°. A three-way diverter is set at the bottom of the flux feeding and positioning mechanism. The flux feeding steel pipe and the conductive rod extend into the three-way diverter respectively. The bottom of the three-way diverter is threaded to the conductive nozzle protective sleeve. The conductive nozzle is set inside the conductive nozzle protective sleeve. The bottom of the conductive nozzle protective sleeve has an arc-shaped notch.

[0009] Furthermore, the heat insulation mechanism also includes a feeding insulating sleeve, a positioning sleeve, a locking nut, and a fixing insulating sleeve. The feeding insulating sleeve is disposed between the flux feeding steel pipe and the steel plate shell, and is sleeved on the outer circumference of the flux feeding steel pipe. The positioning sleeve is fixedly sleeved on the outer circumference of the conductive rod by screws. The fixing insulating sleeve is sleeved on the outer circumference of the positioning sleeve. The fixing insulating sleeve is fixed on the outer circumference of the positioning sleeve by locking nuts. The fixing insulating sleeve is fixedly connected to the steel plate shell by bolts.

[0010] Furthermore, the flux feeding and positioning mechanism includes an extension nut, an upper connecting sleeve, a lower connecting sleeve, a first fixing sleeve, and an insulating sleeve. The upper and lower connecting sleeves are sequentially fitted onto the outer circumference of the conductive rod. A first fixing sleeve is provided on the outer circumference of the connection position between the upper and lower connecting sleeves. The first fixing sleeve is locked and fixed to the upper and lower connecting sleeves by double-ended bolts. An insulating sleeve is provided between the upper connecting sleeve and the first fixing sleeve. The top of the upper connecting sleeve is threaded to the extension nut, and a positioning screw is provided on the side of the extension nut to lock the extension nut onto the conductive rod. The bottom of the lower connecting sleeve is threaded to a three-way shunt. The second fixing sleeve is fixed to the outer oblique side of the first fixing sleeve by fixing bolts.

[0011] Furthermore, a gap of 1.0 to 3.0 mm is left between the lower connecting sleeve and the conductive rod.

[0012] Furthermore, the flux feeding and positioning mechanism is adjustable in height of the conductive rod.

[0013] Furthermore, the angle between the two inlets of the three-way diverter connecting the flux feeding steel pipe and the conductive rod is consistent with the angle between the flux feeding steel pipe and the conductive rod, and the angle is 25° to 45°.

[0014] Furthermore, the arc diameter of the arc-shaped notch is approximately φ8–12 mm, and the notch height is approximately 5–10 mm.

[0015] Furthermore, the distance between the arc-shaped notch and the bottom of the conductive tip is 12-15 mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1) Heat-insulating refractory cotton can effectively block the high temperature inside the heat preservation furnace from radiating to the wire feeding mechanism, reducing the high temperature damage to the wire feeding motor, wire feeding wheel and other components in the wire feeding system, thereby achieving long-term stable operation of the wire feeding system, enabling the welding torch to carry out long-term continuous surfacing welding operations in the high temperature roll heat preservation furnace of 350-450℃, significantly improving the production efficiency of large roll surfacing welding repair, and extending the service life of high temperature submerged arc welding equipment.

[0018] 2) By designing a flux feeding and positioning mechanism, the flux feeding steel pipe is positioned and fixed, ensuring that the flux feeding amount is uniform in the circumferential direction of the contact nozzle. After each contact nozzle replacement, the flux feeding amount in all directions around the contact nozzle remains unchanged, that is, the original uniformity is maintained. The height of the flux feeding and positioning mechanism is adjustable, and the flux feeding coverage thickness is adjustable. After adjustment to a suitable amount, it can be fixed to ensure that the original flux feeding coverage thickness is maintained after each contact nozzle replacement, ensuring the uniformity of flux feeding, thereby obtaining excellent submerged arc welding forming effect.

[0019] 3) By setting an arc-shaped notch at the bottom of the conductive nozzle protective sleeve that matches the shape of the weld bead, the conductive nozzle protective sleeve is prevented from scratching the weld bead that has not yet fully solidified. The flux leaks down from the notch, forming a tail that covers the red-hot weld bead, which helps to prevent weld bead oxidation, improve weld quality, and increase welding efficiency.

[0020] 4) The submerged arc welding gun device has a simple structure, adopts a threaded connection, is easy to install and remove, is flexible to replace, is highly efficient and convenient to use, and improves the repair capability of the rolls. Attached Figure Description

[0021] Figure 1This is a schematic diagram of a high-temperature submerged arc welding gun device for the surfacing repair of large rolling mill rolls, as described in this utility model.

[0022] Figure 2 This is a schematic diagram of the heat insulation mechanism described in this utility model.

[0023] Figure 3 This is a schematic diagram of the flux feeding and positioning mechanism described in this utility model.

[0024] Figure 4 This is a schematic diagram of the conductive nozzle protective sleeve structure described in this utility model.

[0025] In the diagram: 1. Flux hopper; 2. Flux; 3. Flux feeding hose; 4. Flux feeding steel pipe; 5. Welding wire; 6. Wire feeding system; 7. Conductive rod; 8. Heat insulation mechanism; 8-1. Steel plate shell; 8-2. Heat-insulating refractory cotton; 8-3. Feeding insulating sleeve; 8-4. Positioning sleeve; 8-5. Locking nut; 8-6. Fixing insulating sleeve; 8-7. Screw; 8-8. Bolt; 9. Insulation box; 9-1. 10. Insulation box cover; 10. Flux feeding and positioning mechanism; 10-1. Extension nut; 10-2. Positioning screw; 10-3. Upper connecting sleeve; 10-4. Insulating sleeve; 10-5. Fixing sleeve one; 10-6. Double-ended bolt; 10-7. Lower connecting sleeve; 10-8. Fixing sleeve two; 11. Three-way diverter; 12. Conductive nozzle; 13. Conductive nozzle protective sleeve; 13-1. Arc-shaped notch; 14. Roller. Detailed Implementation

[0026] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0027] like Figures 1-4As shown, the working principle of a high-temperature submerged arc welding gun device for large roll surfacing repair is as follows: A heat insulation mechanism 8 is set between the wire feeding system 6 and the insulation box 9 to isolate the heat radiation inside the insulation box 9 from the wire feeding system 6. A flux feeding positioning mechanism 10 is set on the conductive rod 7 inside the insulation box 9. The flux feeding steel pipe 4 is fixed by a fixing sleeve 10-8 set on the oblique side. The flux feeding steel pipe 4 entering the insulation box 9 is gradually brought closer to the conductive rod 7 to form an angle of 25° to 45°. A three-way diverter 11 is threaded to the bottom of the welding feeding positioning mechanism 10. The top of the three-way diverter 11 is provided with two inlets with an angle. The two inlets are respectively connected to the flux feeding steel pipe 4 and... The conductive rod 7 and the flux feeding steel pipe 4 intersect and converge in the three-way distributor 11. The bottom of the three-way distributor 11 is threadedly connected to the conductive nozzle protective sleeve 13. The conductive nozzle 12 is installed inside the conductive nozzle protective sleeve 13. The bottom of the conductive nozzle protective sleeve 13 has an arc-shaped notch 13-1. Since the shape of the arc-shaped notch 13-1 matches the weld bead formed by overlay welding, it avoids the conductive nozzle protective sleeve 13 from scratching the weld bead that has not yet fully solidified. There is a 12mm space between the bottom of the conductive nozzle 12 and the bottom of the arc-shaped notch 13-1. The flux 2 is stored in the conductive nozzle protective sleeve 13. The flux 2 falls from the arc-shaped notch and forms a trail that covers the red-hot weld bead, which helps to prevent the weld bead from oxidizing.

[0028] like Figures 1-4As shown, a high-temperature submerged arc welding gun device for large roll surfacing repair includes a flux feeding hose 3, a flux feeding steel pipe 4, a wire feeding system 6, a conductive rod 7, a heat insulation mechanism 8, a heat preservation box 9, a feeding positioning mechanism 10, a three-way distributor 11, a conductive nozzle 12, and a conductive nozzle protective sleeve 13. The wire feeding system 6 is installed outside the heat preservation box 9, and the conductive rod 7 is installed at the lower part of the wire feeding system 6. The conductive rod 7 extends into the heat preservation box 9, and the conductive nozzle 12 is installed at the bottom of the conductive rod 7. The wire feeding system 6 guides the welding wire 5 into the interior of the conductive rod 7 and connects it to the conductive nozzle 12. The flux feeding steel pipe 4 is located on one side of the conductive rod 7. 4. The flux feeding hose 3 extends into the insulation box and into the flux feeding steel pipe 4. The flux feeding hose 3 connects the flux hopper 1 and the flux feeding steel pipe 4 to transport flux 2. The flux 2 is transported to the area around the conductive nozzle 12 inside the insulation box 9. The heat insulation mechanism 8 includes a steel plate shell 8-1 and heat-insulating refractory cotton 8-2. The steel plate shell 8-1 is horizontally set between the insulation box 9 and the wire feeding system 6. The flux feeding steel pipe 4 and the conductive rod 7 pass through the steel plate shell 8-1 and extend into the insulation box 9. The heat-insulating refractory cotton 8-2 is set on the side of the steel plate shell 8-1 facing the wire feeding system 6. The heat insulation mechanism 8 is installed below the wire feeding system 6 and above the insulation box cover 9-1 of the roll 14.During the welding process of the roll 14, after opening the insulation box cover 9-1, the heat-insulating refractory cotton 8-2 can effectively block the high temperature inside the insulation box 9 from radiating to the wire feeding system 6, reducing the high temperature damage to components such as the wire feeding motor and wire feeding wheel in the wire feeding system 6, thereby achieving long-term stable operation of the wire feeding system 6. The flux feeding positioning mechanism 10 is set on the outer circumference of the conductive rod 7 inside the insulation box 9, and a fixing sleeve 10-8 is set on the oblique side of the flux feeding positioning mechanism 10. The flux feeding pipe 4, through the flux feeding positioning mechanism 10, forms a 25°–45° angle with the conductive rod 7. This angle facilitates smooth flux flow. The fixing sleeve 10-8 positions the flux feeding pipe 4, ensuring it is positioned diagonally above the conductive nozzle 12. This ensures uniform flux 2 feeding in the circumferential direction of the conductive nozzle 12. The flux feeding pipe 4 is positioned by the flux feeding positioning mechanism 10. When the conductive nozzle 12 is replaced... The amount of flux 2 discharged in all directions around the conductive nozzle 12 remains unchanged, maintaining its original uniformity. A three-way distributor 11 is installed at the bottom of the flux discharge positioning mechanism 10. Two inlets are located at the top of the three-way distributor 11. The flux discharge steel pipe 4 and the conductive rod 7 extend into the three-way distributor 11 respectively. The bottom of the three-way distributor 11 is threadedly connected to the conductive nozzle protective sleeve 13. The conductive nozzle 12 is housed within the conductive nozzle protective sleeve 13. The three-way distributor 11 directs the flux discharge steel pipe 4 and the conductive rod... 7. The flux 2 in the flux feeding steel pipe 4 flows through the three-way distributor 11 into the bottom conductive nozzle protective sleeve 13. A conductive nozzle 12 is installed inside the conductive nozzle protective sleeve 13. The flux 2 is evenly fed from the circumference of the conductive nozzle 12, with a uniform feeding amount. The bottom of the conductive nozzle protective sleeve 13 has an arc-shaped notch 13-1, which matches the shape of the weld bead. During the welding process, as the roller 14 rotates, the molten pool begins to solidify after leaving the welding torch. When rotating to the position of the arc-shaped notch 13-1, because the shape of the arc-shaped notch 13-1 matches the weld bead, the conductive nozzle protective sleeve 13 will not scrape the not-yet-fully-solidified molten pool weld bead. Furthermore, the flux 2 leaks from the notch, forming a trailing layer that covers the red-hot weld bead, helping to prevent weld oxidation.

[0029] Furthermore, the heat insulation mechanism 8 also includes a feeding insulating sleeve 8-3, a positioning sleeve 8-4, a locking nut 8-5, and a fixing insulating sleeve 8-6. The feeding insulating sleeve 8-3 is sleeved on the outer circumference of the flux feeding steel pipe 4 and is positioned between the flux feeding steel pipe 4 and the steel plate shell 8-1. The positioning sleeve 8-4 is fixedly sleeved on the outer circumference of the conductive rod 7 by screws 8-7. The fixing insulating sleeve 8-6 is sleeved on the outer circumference of the positioning sleeve 8-4. The fixing insulating sleeve 8-6 is connected to the positioning sleeve 8-4 by screws 8-7. The locking nut 8-5 is fixed to the outer circumference of the positioning sleeve 8-4. The fixing insulating sleeve 8-6 is fixedly connected to the steel plate shell 8-1 by bolts 8-8. The positioning sleeve 8-4 is fixed to the conductive rod 7, the fixing insulating sleeve 8-6 is fixed to the positioning sleeve 8-4, and the steel plate shell 8-1 is fixed to the fixing insulating sleeve 8-6. The steel plate shell 8-1 is fixedly set between the wire feeding system 6 and the heat insulation box 9. The steel plate shell 8-1 plays a supporting role, supporting the heat insulation and fireproof cotton 8-2 set on it, and insulating the wire feeding system 6. The feeding insulating sleeve 8-3 and the fixing insulating sleeve 8-6 ensure the insulation performance of the heat insulation mechanism 8 and prevent the phenomenon of short circuit or shunting of welding current during the welding process, which leads to unstable weld formation quality.

[0030] Furthermore, the flux feeding and positioning mechanism 10 includes an extension nut 10-1, an upper connecting sleeve 10-3, a lower connecting sleeve 10-7, a fixing sleeve 10-5, and an insulating sleeve 10-4. The upper connecting sleeve 10-3 and the lower connecting sleeve 10-7 are sequentially sleeved on the outer circumference of the conductive rod 7. A fixing sleeve 10-5 is provided on the outer circumference of the connection position between the upper connecting sleeve 10-3 and the lower connecting sleeve 10-7. The fixing sleeve 10-5 is locked and fixed to the upper connecting sleeve 10-3 and the lower connecting sleeve 10-7 by a double-ended bolt 10-6. An insulating sleeve 10-4 is provided between the upper connecting sleeve 10-3 and the fixing sleeve 10-5. The top of the upper connecting sleeve 10-3 is threadedly connected to the extension nut 10-1. -1, The extension nut 10-1 is provided with a positioning screw 10-2 on the side to lock the extension nut 10-1 on the conductive rod 7; the flux feeding positioning mechanism 10 is fixed on the conductive rod 7 by the positioning screw 10-2. In the height direction of the conductive nozzle 12, the height of the flux feeding positioning mechanism 10 is adjustable, the feeding position of the flux feeding steel pipe 4 is adjustable, and the flux 2 feeding coverage thickness is adjustable. After adjusting to a suitable amount, it can be fixed, and it is ensured that the original flux 2 feeding coverage thickness is maintained after each replacement of the conductive nozzle 12. The bottom of the lower connecting sleeve 10-7 is threadedly connected to the three-way diverter 11. The second fixing sleeve 10-8 is fixed to the outer oblique side of the first fixing sleeve 10-5 by fixing bolts.

[0031] Furthermore, the flux feeding and positioning mechanism 10 is adjustable in height position on the conductive rod 7.

[0032] Furthermore, the angle between the two inlets of the three-way diverter 11 connecting the flux feeding steel pipe 4 and the conductive rod 7 is consistent with the angle between the flux feeding steel pipe 4 and the conductive rod 7, and the angle is 25° to 45°.

[0033] Furthermore, the arc diameter of the arc notch 13-1 is approximately φ8~12mm, and the height is approximately 5~10mm. The arc notch 13-1 not only prevents the protective sleeve 13 from scratching the formed flux slag shell, but also allows the flux 2 to be smoothly fed along the arc notch 13-1, thereby better covering the molten pool that has left the welding torch but has not yet completely solidified, effectively reducing the oxidation of the weld metal.

[0034] Furthermore, a gap of 1.0 to 3.0 mm is left between the lower connecting sleeve 10-7 and the conductive rod 7, and the lower connecting sleeve 10-7 and the conductive rod 7 are in a non-contact state. An insulating sleeve 10-4 is embedded between the fixing sleeve 10-5 and the upper connecting sleeve 10-3 to ensure the insulation performance of the flux feeding and positioning mechanism 10.

[0035] Furthermore, the positioning distance between the arc-shaped notch 13-1 of the conductive tip protective sleeve 13 and the conductive tip 12 is 12mm, which is conducive to the flux 2 fully covering the welding arc and preventing the conductive tip 12 from burning out.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-temperature submerged arc welding gun device for surfacing repair of large rolls, comprising a flux feeding hose (3), a flux feeding steel pipe (4), a wire feeding system (6), a conductive rod (7), a heat insulation mechanism (8), a heat insulation box (9), a feeding positioning mechanism (10), a three-way diverter (11), a conductive nozzle (12), and a conductive nozzle protective sleeve (13), wherein the flux feeding hose (3) extends into the welding feeding steel pipe (4), characterized in that, The heat insulation mechanism (8) includes a steel plate shell (8-1) and heat-insulating refractory cotton (8-2). The steel plate shell (8-1) is horizontally positioned between the heat insulation box (9) and the wire feeding system (6). The flux feeding steel pipe (4) and the conductive rod (7) pass through the steel plate shell (8-1) and extend into the heat insulation box (9). The heat-insulating refractory cotton (8-2) is provided on the side of the steel plate shell (8-1) facing the wire feeding system (6). The flux feeding positioning mechanism (10) is located on the outer circumference of the conductive rod (7) inside the heat insulation box (9). A fixing sleeve (10-) is provided on the oblique side of the flux feeding positioning mechanism (10). 8) Connect the flux feeding steel pipe (4) and make the flux feeding steel pipe (4) and the conductive rod (7) form an angle of 25° to 45° through the flux feeding positioning mechanism (10). The flux feeding positioning mechanism (10) is equipped with a three-way diverter (11) at the bottom. The flux feeding steel pipe (4) and the conductive rod (7) are respectively inserted into the three-way diverter (11). The bottom of the three-way diverter (11) is threadedly connected to the conductive nozzle protective sleeve (13). The conductive nozzle (12) is set in the conductive nozzle protective sleeve (13). The bottom of the conductive nozzle protective sleeve (13) is provided with an arc-shaped notch (13-1).

2. The high-temperature submerged arc welding torch device for large roll surfacing repair according to claim 1, characterized in that, The heat insulation mechanism (8) further includes a feeding insulating sleeve (8-3), a positioning sleeve (8-4), a locking nut (8-5), and a fixing insulating sleeve (8-6). The feeding insulating sleeve (8-3) is disposed between the flux feeding steel pipe (4) and the steel plate shell (8-1) and is sleeved on the outer circumference of the flux feeding steel pipe (4). The positioning sleeve (8-4) is sleeved on the outer circumference of the conductive rod (7) by screws (8-7). The fixing insulating sleeve (8-6) is sleeved on the outer circumference of the positioning sleeve (8-4). The fixing insulating sleeve (8-6) is fixed on the outer circumference of the positioning sleeve (8-4) by locking nuts (8-5). The fixing insulating sleeve (8-6) is fixedly connected to the steel plate shell (8-1) by bolts (8-8).

3. The high-temperature submerged arc welding torch device for large roll surfacing repair according to claim 1, characterized in that, The flux feeding and positioning mechanism (10) includes an extension nut (10-1), an upper connecting sleeve (10-3), a lower connecting sleeve (10-7), a fixing sleeve one (10-5), and an insulating sleeve (10-4). The upper connecting sleeve (10-3) and the lower connecting sleeve (10-7) are sequentially sleeved on the outer circumference of the conductive rod (7). A fixing sleeve one (10-5) is provided on the outer circumference of the connection position between the upper connecting sleeve (10-3) and the lower connecting sleeve (10-7). The fixing sleeve one (10-5) is locked and fixed to the upper connecting sleeve (10-3) by a double-headed bolt (10-6). An insulating sleeve (10-4) is provided between the lower connecting sleeve (10-7), the upper connecting sleeve (10-3), and the first fixing sleeve (10-5). The top of the upper connecting sleeve (10-3) is threadedly connected to the extension nut (10-1), and a positioning screw (10-2) is provided on the side of the extension nut (10-1) to lock the extension nut (10-1) on the conductive rod (7). The bottom of the lower connecting sleeve (10-7) is threadedly connected to the three-way shunt (11), and the second fixing sleeve (10-8) is fixed to the outer oblique side of the first fixing sleeve (10-5) by fixing bolts.

4. A high-temperature submerged arc welding torch device for surfacing repair of large rolling mill rolls according to claim 3, characterized in that, A gap of 1.0 to 3.0 mm is left between the lower connecting sleeve (10-7) and the conductive rod (7).

5. A high-temperature submerged arc welding torch device for surfacing repair of large rolling mill rolls according to claim 1 or 3, characterized in that, The flux feeding and positioning mechanism (10) is adjustable in height position on the conductive rod (7).

6. A high-temperature submerged arc welding torch device for surfacing repair of large rolling mill rolls according to claim 1, characterized in that, The angle between the two inlets of the three-way diverter (11) connecting the flux feeding steel pipe (4) and the conductive rod (7) is consistent with the angle between the flux feeding steel pipe (4) and the conductive rod (7), and the angle is 25° to 45°.

7. A high-temperature submerged arc welding torch device for surfacing repair of large rolling mill rolls according to claim 1, characterized in that, The arc diameter of the arc-shaped notch (13-1) is approximately φ8 to 12 mm, and the notch height is approximately 5 to 10 mm.

8. A high-temperature submerged arc welding torch device for surfacing repair of large rolling mill rolls according to claim 1, characterized in that, The distance between the arc-shaped notch (13-1) and the bottom of the conductive nozzle (12) is 12-15 mm.

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