Combined welding gun

Abstract

The utility model relates to the technical field of welding equipment, in particular to a combined welding gun which comprises a machine frame, a movable support arranged on the machine frame, a welding gun body vertically arranged on the support, a motor arranged on the support and used for driving the support to move on the machine frame, and a main gear arranged at the driving end of the motor. A rack and a driven gear are meshed with the driving gear, a rotating shaft is sleeved with the driven gear, one side of the rotating shaft is installed on the driven gear, and a wire feeding device is arranged on the other side of the rotating shaft. The wire feeding device comprises a box body arranged on the support, two guide pipes vertically arranged on the box body, a fixing base arranged between the two guide pipes, a first roller rotationally arranged on the fixing base and a second roller arranged on the side, away from the fixing base, of the first roller. The two guide pipes are embedded in the top plate and the bottom plate of the box body respectively, and the other side of the rotating shaft is connected with the second roller. The utility model provides a combined welding gun which is convenient to move and convey welding wires synchronously.

Description

Technical Field

[0001] The utility model relates to the technical field of welding equipment, and particularly relates to a combined welding torch. Background Art

[0002] Welding is known as the industrial tailor. Components processed by welding usually show strong bonding force, so that the components processed by welding have high stiffness and integrity, can bear large loads, can better resist external pressure, and greatly improve the quality of the components. Therefore, welding is widely used in the bonding treatment of metals or other thermoplastic parts. During the welding process, as an important tool, the welding torch is responsible for performing the welding operation. The appearance of the welding torch is similar to that of a gun, and a special nozzle is equipped at the head of the welding torch. By using this nozzle to apply high temperature or high pressure, the bonding treatment of metals or other thermoplastic materials can be carried out. For welding, the welding torch needs to be able to move in any direction such as horizontally and vertically during the welding process, so as to facilitate moving along the weld seam to join the metals or other thermoplastic materials to be connected together.

[0003] A welding wire serves as a filler metal or can also be a wire welding material that conducts electric current. The welding wire can be melted at the weld joint through high temperature or high pressure, thereby joining the metals or other thermoplastic materials to be connected together. For welding processing, the accuracy of the welding wire delivery is very important for the welding quality. Therefore, the delivery of the welding wire is a very important operation link in the welding process. If the manual wire feeding method is used, the welder must hold the welding wire, which limits the length of the held welding wire. When performing long-term welding processing, the welding wire needs to be frequently taken, resulting in low welding efficiency, and a small section of the welding wire will be left unused when each section of the welding wire is welded, causing waste. To avoid this situation, a wire feeding device is used to achieve the delivery of the welding wire. The wire is driven to be delivered by operating a stepping reduction motor. This method is more stable and efficient in wire feeding compared to manual wire feeding and can better meet the requirements of continuous welding. However, in the actual welding process, the delivery amount of the welding wire is in a directly proportional relationship with the travel distance of the welding torch. This means that for every certain distance the welding torch moves forward, a corresponding amount of welding wire needs to be continuously delivered to the welding area. However, since the efficiency of the wire feeding device in delivering the welding wire depends on the operating speed of the stepping reduction motor, this means that if the welding torch stops moving, the stepping reduction motor needs to be controlled to stop delivering the welding wire. This makes it necessary to manipulate the stepping reduction motor to stop the delivery of the welding wire when the welding torch pauses, and when the welding torch needs to change its moving speed, the operating speed of the stepping reduction motor also needs to be adjusted. Such an operation process is quite complex and difficult to meet the actual requirements of welding. Therefore, there is room for improvement in the welding wire delivery of the welding torch to facilitate the synchronization of the movement of the welding torch and the delivery of the welding wire, thereby facilitating the use of the welding torch to complete the welding processing. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present utility model provides a combined welding torch that facilitates the synchronization of the movement of the welding torch and the delivery of the welding wire, so as to overcome the defects in the prior art.

[0005] The technical solution adopted by the present utility model is as follows: A combined welding torch includes a frame, a movable bracket is arranged on the frame, a welding torch body is vertically arranged on the bracket, a motor for driving the bracket to move on the frame is arranged on the bracket, a main gear is arranged on the driving end of the motor, a rack and a driven gear are respectively meshed with the main gear, the rack is installed on the frame, a rotating shaft is sleeved inside the driven gear, one side of the rotating shaft is installed on the driven gear, and a wire feeding device is arranged on the other side of the rotating shaft; the wire feeding device includes a box body arranged on the bracket, two guide tubes vertically arranged on the box body, a fixing seat arranged between the two guide tubes, a first roller rotatably arranged on the fixing seat, and a second roller arranged on the side of the first roller away from the fixing seat. The box body is installed on the bracket, the two guide tubes are respectively embedded in the top plate and the bottom plate of the box body, the fixing seat is installed inside the box body, and the other side of the rotating shaft is connected to the second roller.

[0006] Preferably, a connecting shaft is rotatably provided on the box body, the second roller is installed on the connecting shaft, and a one-way transmission mechanism is provided between the connecting shaft and the rotating shaft; the one-way transmission mechanism includes an internally meshing ratchet wheel provided on the connecting shaft, a disc is provided on one side of the internally meshing ratchet wheel close to the rotating shaft, several pawls are provided on the disc, and a cover plate is rotatably sleeved on the rotating shaft. The cover plate adopts a cylindrical structure, a sleeve hole is opened at the bottom of the cover plate, the sleeve hole is rotatably sleeved on the rotating shaft, the aperture of the sleeve hole is not larger than the diameter of the disc, the disc is located inside the cover plate, the cover plate is threadedly sleeved on the internally meshing ratchet wheel, one end of the disc is installed on the rotating shaft, several pawls are arranged at equal intervals along the circumferential direction of the disc at the other end, the inner sides of several pawls are hinged on the disc, the internally meshing ratchet wheel is installed on the connecting shaft, a ratchet groove is opened on the internally meshing ratchet wheel, several pawls are all located in the ratchet groove, and the outer sides of the pawls are in contact with the groove walls of the ratchet groove.

[0007] Preferably, two fixing rods are provided on one side of the fixed seat away from the second roller. Two through holes are respectively opened on one side of the box body along the vertical direction, and the two through holes are respectively movably sleeved on the two fixing rods. Springs and first nuts are respectively sleeved on the two fixing rods. The two sides of the spring are respectively in contact with the inner wall of the box body and the fixed seat. The first nut is threadedly sleeved on the fixing rod, and the first nut is located outside the box body. The fixing rod is clamped on the box body by the spring and the first nut.

[0008] Preferably, a fixing sleeve is provided on the outside of the box body. The fixing sleeve is movably sleeved on the fixing rod. The inner diameter of the fixing sleeve is matched with the diameter of the fixing rod. One end of the fixing sleeve is installed on the box body. The fixing sleeve is communicated with the box body through a through hole opened on the box body. One side of the first nut is in contact with the other end of the fixing sleeve.

[0009] Preferably, a fixing plate and a second nut are respectively provided on the outside of the first nut. Two through holes are opened on the fixing plate, and the two through holes are respectively sleeved on the two fixing rods. The number of the second nuts is two, and the two second nuts are respectively threadedly sleeved on the two fixing rods. The fixing plate is pressed on the first nut by the second nut.

[0010] Preferably, the bottom of the guiding tube adopts a flared tubular structure, and the inner cavity diameter at the bottom end of the guiding tube is not larger than the inner cavity diameter in the middle of the guiding tube.

[0011] Preferably, several guide rails are provided between the frame and the bracket. Several guide rails are all installed on the frame. Several guide rails are all parallel to the rack. Sliders are respectively provided on several guide rails. A chute is opened on the slider, and the guide rail is movably sleeved in the chute. The cross-sectional shape of the inner cavity of the chute is matched with the cross-sectional shape of the guide rail. The slider is installed on the bracket.

[0012] Preferably, a fixing frame is arranged between the bracket and the welding torch body. The fixing frame is installed on the bracket. A fixing hole is vertically formed in the fixing frame. The welding torch body is sleeved in the fixing hole. A threaded hole is formed in one side of the fixing frame away from the bracket. The threaded hole communicates with the fixing hole. A bolt is threadedly sleeved in the threaded hole. One end of the bolt contacts the welding torch body. The welding torch body is clamped on the fixing frame by the bolt.

[0013] The beneficial effects of the present utility model are as follows: Firstly, by setting the motor, the driving gear, and the rack meshing with the driven gear, it is convenient to push the bracket to move along the rack. Meanwhile, the rotating shaft is driven to rotate, thereby driving the second roller to rotate. By clamping the welding wire between the first roller and the second roller, the rotation of the second roller can drive the welding wire to be conveyed towards the welding torch body, so as to facilitate the synchronous movement of the welding torch body and the conveyance of the welding wire, thus facilitating the welding operation using the welding torch body. Moreover, the present utility model guides the welding wire through the provided guiding tube to facilitate guiding the welding wire to be clamped between the first roller and the second roller or into the wire inlet of the welding torch body.

[0014] Secondly, the transmission between the rotating shaft and the connecting shaft of the present utility model is restricted by setting the internal meshing ratchet wheel, the disc, the pawl, and the cover plate. When the rotating shaft rotates forward, the outside of the pawl is buckled on the ratchet groove of the internal meshing ratchet wheel. Through the rotation of the pawl, the internal meshing ratchet wheel, the connecting shaft, and the second roller can be driven to rotate, thus facilitating driving the welding wire to be conveyed towards the welding torch body; conversely, if the rotating shaft rotates reversely, the outside of the pawl slides in the ratchet groove of the internal meshing ratchet wheel, and the internal meshing ratchet wheel, the connecting shaft, and the second roller cannot be driven to rotate, so as to prevent the second roller from rotating, thereby avoiding the rotating shaft driving the welding wire to move during the reset process of the welding torch body, so as to facilitate the reset of the welding torch body. Moreover, the present utility model is provided with a fixing rod and a spring to facilitate driving the fixing seat and the first roller to extrude the second roller, so as to facilitate clamping the welding wire between the first roller and the second roller. By setting the first nut, the fixing rod can be clamped on the box body. And the present utility model is provided with a fixing sleeve to support and limit the fixing rod, so as to reduce the shaking of the fixing rod, thereby improving the stability of the use of the fixing rod.

[0015] Thirdly, the present utility model connects the two fixing rods through the provided fixing plate to facilitate the synchronous movement of the two fixing rods. By pulling the fixing plate, the welding wire cannot be extruded between the second roller and the first roller, that is, the conveyance of the welding wire is stopped. Moreover, the present utility model is provided with a guide rail and a slider to support and limit the bracket and restrict the bracket to only move along the rack, so as to improve the stability of the movement of the welding torch body. By setting the fixing frame and the bolt, the up-and-down fixing position of the welding torch body can be adjusted to facilitate welding parts of various thicknesses. Description of the Drawings

[0016] Figure 1 This is the first three-dimensional schematic diagram of the present utility model.

[0017] Figure 2 This is the second three-dimensional schematic diagram of the present utility model.

[0018] Figure 3 This is the assembly cross-sectional view of the box body in the present utility model.

[0019] Figure 4 This is the exploded assembly view of the rotating shaft and the connecting shaft in the present utility model.

[0020] Figure 5 This is the exploded assembly view of the first roller and the second roller in the present utility model. Detailed implementation manner

[0021] As Figures 1 to 5 shown, a combined welding torch includes a frame 1, a movable bracket 2 is arranged on the frame 1, a welding torch body 3 is vertically arranged on the bracket 2, and a motor 4 for driving the bracket 2 to move on the frame 1 is arranged on the bracket 2. A main gear 5 is arranged on the driving end of the motor 4. A rack 6 and a driven gear 7 are respectively meshed with the main gear 5. The rack 6 is installed on the frame 1. A rotating shaft 8 is sleeved inside the driven gear 7. One side of the rotating shaft 8 is installed on the driven gear 7, and a wire feeding device is arranged on the other side of the rotating shaft 8. By controlling the operation of the motor 4, the main gear 5 is driven to rotate. Since the main gear 5 is meshed with the rack 6 and the driven gear 7, the bracket 2 is pushed to move along the rack 6, and the rotating shaft 8 is driven to rotate, thereby driving the wire feeding mechanism to convey the welding wire. The wire feeding device includes a box body 9 arranged on the bracket 2, two guide pipes 10 vertically arranged on the box body 9, a fixing seat 11 arranged between the two guide pipes 10, a first roller 12 rotatably arranged on the fixing seat 11, and a second roller 13 arranged on the side of the first roller 12 away from the fixing seat 11. The box body 9 includes a top plate, a bottom plate and four side plates. The box body 9 is installed on the bracket 2. The two guide pipes 10 are respectively embedded in the top plate and the bottom plate of the box body 9. The fixing seat 11 is installed inside the box body 9. The other side of the rotating shaft 8 is connected to the second roller 13. The guide pipes 10 are used to guide the conveyance of the welding wire, so as to facilitate the conveyance of the welding wire between the first roller 12 and the second roller 13. The welding wire is clamped between the first roller 12 and the second roller 13. By driving the second roller 13 to rotate by the rotating shaft 8, the welding wire is driven to be conveyed towards the welding torch body 3, so as to facilitate the use of the welding torch body 3 for welding operations.

[0022] In this embodiment, a connecting shaft 14 is rotatably arranged on the box body 9. A bearing is sleeved on the connecting shaft 14, and the connecting shaft 14 is rotatably installed on the box body 9 through this bearing. The second roller 13 is installed on the connecting shaft 14, and a one-way transmission mechanism is arranged between the connecting shaft 14 and the rotating shaft 8. The one-way transmission mechanism includes an internally meshing ratchet wheel 15 arranged on the connecting shaft 14, a disc 16 arranged on one side of the internally meshing ratchet wheel 15 close to the rotating shaft 8, several pawls 17 arranged on the disc 16, and a cover plate 18 rotatably sleeved on the rotating shaft 8. The cover plate 18 adopts a cylindrical structure. A sleeve hole is opened at the bottom of the cover plate 18. This sleeve hole is rotatably sleeved on the rotating shaft 8. A bearing is arranged in this sleeve hole. The inner ring of this bearing is installed on the rotating shaft 8, and the outer ring of this bearing is installed on the sleeve hole of the cover plate 18. A support seat is rotatably arranged in the middle of the rotating shaft 8. This support seat is installed on the motor 4, so as to support and limit the rotating shaft 8, facilitating the use of the rotating shaft 8 for transmission. The aperture of this sleeve hole is not larger than the diameter of the disc 16. The disc 16 is located inside the cover plate 18. The cover plate 18 is threadedly sleeved on the internally meshing ratchet wheel 15. One end of the disc 16 is installed on the rotating shaft 8. Several pawls 17 are arranged at equal intervals along the circumferential direction of the disc 16 at the other end. The inner sides of several pawls 17 are hinged on the disc 16. The internally meshing ratchet wheel 15 is installed on the connecting shaft 14. A ratchet groove 19 is opened on the internally meshing ratchet wheel 15. Several pawls 17 are all located in the ratchet groove 19. The outer sides of the pawls 17 are in contact with the groove wall of the ratchet groove 19. The centers of the connecting shaft 14, the second roller 13, the internally meshing ratchet wheel 15, and the disc 16 are located on the same axis, thereby restricting the second roller 13 to rotate only in one direction.

[0023] Please participate again Figure 2 、 3 As shown in Figures 1, 4, and 5, two fixing rods 20 are arranged on the side of the fixing seat 11 away from the second roller 13. Two through holes are respectively opened on one side of the box body 9 along the vertical direction. The two through holes are respectively movably sleeved on the two fixing rods 20. Springs 21 and first nuts 22 are respectively sleeved on the two fixing rods 20. The two sides of the spring 21 are respectively in contact with the inner wall of the box body 9 and the fixing seat 11. The first nut 22 is threadedly sleeved on the fixing rod 20. The first nut 22 is located outside the box body 9. The fixing rod 20 is clamped on the box body 9 through the spring 21 and the first nut 22. By using the elasticity of the spring 21, the fixing rod 20, the fixing seat 11, and the first roller 12 are driven to squeeze towards the second roller 11 to clamp the welding wire between the first roller 12 and the second roller 13. It should be noted that a fixing groove is opened on the other side of the fixing seat 11. The first roller 12 is sleeved in this fixing groove. A fixing shaft is rotatably sleeved in the first roller 12. This fixing shaft is installed in the fixing seat 11. The side of the first roller 12 close to the second roller 13 is located outside this fixing groove. The central axes of the second roller 13 and the first roller 12 are parallel to each other, so as to facilitate the first roller 12 to be rotatably installed on the fixing seat 11 to facilitate the conveyance of the clamped welding wire.

[0024] Specifically, a fixing sleeve 23 is arranged on the outer side of the box body 9. The fixing sleeve 23 is movably sleeved on the fixing rod 20. The inner diameter of the fixing sleeve 23 is matched with the diameter of the fixing rod 20. One end of the fixing sleeve 23 is installed on the box body 9. The fixing sleeve 23 is communicated with the box body 9 through a perforation formed on the box body 9. One side of the first nut 22 is in contact with the other end of the fixing sleeve, so as to support and limit the fixing rod 20, reduce the shaking of the fixing rod 20, and improve the stability of the fixing rod 20 during use.

[0025] In this embodiment, a fixing plate 24 and second nuts 25 are respectively arranged on the outer side of the first nut 22. Two through holes are formed on the fixing plate 24. The two through holes are respectively sleeved on the two fixing rods 20. The number of the second nuts 25 is two. The two second nuts 25 are respectively threadedly sleeved on the two fixing rods 20. The fixing plate 24 is pressed on the first nut 22 through the second nuts 25, so as to fix the fixing plate 24 on the two fixing rods 20. Furthermore, the two fixing rods 20 are connected through the fixing plate 24, so as to facilitate the synchronous movement of the two fixing rods 20. And if it is necessary to stop the feeding of the welding wire, by pulling the fixing plate 24, that is, moving the first roller 12 in a direction away from the second roller 13, so that the welding wire cannot be pressed between the second roller 13 and the first roller 12, that is, the second roller 13 cannot press the welding wire for feeding, thereby stopping the feeding of the welding wire.

[0026] It should be noted that the bottom of the guiding tube 10 adopts a horn-shaped tubular structure. The inner cavity diameter of the bottom end of the guiding tube 10 is not larger than the inner cavity diameter of the middle part of the guiding tube 10, so as to guide the welding wire between the first roller 12 and the second roller 13 or into the wire inlet of the welding torch body 3.

[0027] Please refer to again Figure 1 and 2 , a plurality of guide rails 26 are arranged between the frame 1 and the support 2. The plurality of guide rails 26 are all installed on the frame 1. The plurality of guide rails 26 are all parallel to the rack 6. Sliders 27 are respectively arranged on the plurality of guide rails 26. A chute is formed on the slider 27. The guide rail 26 is movably sleeved in the chute. The cross-sectional shape of the inner cavity of the chute is matched with the cross-sectional shape of the guide rail 26. The slider 27 is installed on the support 2, so as to support and limit the support 2 and limit the support 2 to only move along the rack 6, so as to improve the stability of the movement of the welding torch body 3.

[0028] In this embodiment, a fixing frame 28 is provided between the bracket 2 and the welding torch body 3. The fixing frame 28 is installed on the bracket 2. A fixing hole is provided in the fixing frame 28 along the vertical direction. The welding torch body 3 is sleeved in the fixing hole. A threaded hole is provided on one side of the fixing frame 28 away from the bracket 2. The threaded hole communicates with the fixing hole. A bolt 29 is threadedly sleeved in the threaded hole. One end of the bolt 29 contacts the welding torch body 3. The welding torch body 3 is clamped on the fixing frame 28 by the bolt 29. By turning the bolt 29, it is convenient to adjust the vertical fixing position of the welding torch body 3 so as to perform welding treatment on parts of various thicknesses.

[0029] The assembly method of this product is as follows: As Figure 1 shown, first, install the frame 1 on the top surface of the workbench, install the fixing frame 28 on the bracket 2, and install a fixture on the workbench so that the clamping part of the fixture is located below the fixing hole of the fixing frame 28, thereby clamping the parts on the workbench by the fixture, and sleeving the welding torch body 3 in the fixing hole of the fixing frame 28. Then, adjust the placement position of the welding torch body 3 in the fixing hole of the fixing frame 28, and use the bolt 29 to clamp the welding torch body 3 on the fixing frame 28 to adjust the distance between the welding torch body 3 and the fixture, so as to facilitate the use of the welding torch body 3 to complete the welding operation. By starting the motor 4, observe whether the bracket 2 moves along the frame 1, and observe whether the driven wheel 7, the rotating shaft 8 and the connecting shaft 14 rotate. If there is a problem with the transmission of this product, the motor 4 should be turned off in time and this product should be maintained. Then, after this product is running normally, turn off the operation of the motor 4, thread the welding wire into the guide tube 10 at the top of the box body 9, so that the welding wire passes through between the first roller 12 and the second roller 13, and then passes through the guide tube 10 at the bottom of the box body 9, thereby threading the welding wire into the welding torch body 3 to complete the assembly of this product.

[0030] When this product is in use, by starting the motor 4 to move forward, since the main gear 5 meshes with the rack 6 and the driven gear 7, the main gear 5 is driven by the motor 4 to rotate forward, driving the bracket 2 to move forward along the rack 6. At the same time, the second roller 13 is driven to rotate, thereby squeezing the welding wire to be conveyed towards the welding torch body 3 to facilitate the use of the welding torch body 3 for welding operations. If the motor is started to move in the reverse direction, the main gear 5 is driven by the motor 4 to rotate in the reverse direction, driving the bracket 2 to move backward and reset along the frame 1. Since the reversely rotating pawl 17 cannot abut against the ratchet groove 18, the rotation of the rotating shaft 8 cannot be transmitted to the connecting shaft 14, thereby preventing the welding wire from moving when the bracket 2 is reset, so as to reset the bracket 2 and the welding torch body 3.

[0031] In this embodiment, the provided motor 4, the driving gear 5 and the rack 6 are engaged with the driven gear 7 to facilitate the movement of the bracket 2 along the rack 6. Meanwhile, the rotation shaft 8 is driven to rotate, thereby driving the second roller 13 to rotate. By clamping the welding wire between the first roller 12 and the second roller 13, the rotation of the second roller 13 can be utilized to drive the welding wire to be conveyed towards the welding torch body 3, so as to facilitate the synchronous movement of the welding torch body 3 and the conveyance of the welding wire, thereby facilitating the use of the welding torch body 3 for welding operations. Moreover, in this embodiment, the provided guide tube 10 guides the welding wire to facilitate guiding the welding wire to be clamped between the first roller 12 and the second roller 13 or into the wire inlet of the welding torch body 3.

[0032] The above-described embodiments are only the preferred embodiments of the present invention, and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features and principles described in the scope of the present invention patent should be included in the scope of the patent application of the present invention.

Claims

1. A combined welding torch, comprising a frame (1), a movable bracket (2) is arranged on the frame (1), a welding torch body (3) is vertically arranged on the bracket (2), and a motor (4) for driving the bracket (2) to move on the frame (1) is arranged on the bracket (2), characterized in that: A main gear (5) is provided on the driving end of the motor (4). A rack (6) and a driven gear (7) are respectively meshed with the main gear (5). The rack (6) is installed on the frame (1). A rotating shaft (8) is sleeved inside the driven gear (7). One side of the rotating shaft (8) is installed on the driven gear (7), and a wire feeding device is provided on the other side of the rotating shaft (8). The wire feeding device includes a box body (9) provided on a bracket (2), two guide pipes (10) vertically arranged on the box body (9), a fixed seat (11) arranged between the two guide pipes (10), a first roller (12) rotatably arranged on the fixed seat (11), and a second roller (13) arranged on the side of the first roller (12) away from the fixed seat (11). The box body (9) is installed on the bracket (2). The two guide pipes (10) are respectively embedded in the top plate and the bottom plate of the box body (9). The fixed seat (11) is installed inside the box body (9). The other side of the rotating shaft (8) is connected to the second roller (13).

2. The combined welding torch according to claim 1, wherein: A connecting shaft (14) is rotatably arranged on the box body (9). The second roller (13) is installed on the connecting shaft (14). A one-way transmission mechanism is arranged between the connecting shaft (14) and the rotating shaft (8). The one-way transmission mechanism includes an internally meshing ratchet wheel (15) arranged on the connecting shaft (14), a disc (16) arranged on the side of the internally meshing ratchet wheel (15) close to the rotating shaft (8), several pawls (17) arranged on the disc (16), and a cover plate (18) rotatably sleeved on the rotating shaft (8). The cover plate (18) adopts a cylindrical structure. A sleeve hole is opened at the bottom of the cover plate (18). The sleeve hole is rotatably sleeved on the rotating shaft (8). The aperture of the sleeve hole is not larger than the diameter of the disc (16). The disc (16) is located inside the cover plate (18). The cover plate (18) is threadedly sleeved on the internally meshing ratchet wheel (15). One end of the disc (16) is installed on the rotating shaft (8). Several pawls (17) are arranged at equal intervals along the circumferential direction of the disc (16) at the other end. The inner sides of several pawls (17) are hinged on the disc (16). The internally meshing ratchet wheel (15) is installed on the connecting shaft (14). A ratchet groove (19) is opened on the internally meshing ratchet wheel (15). Several pawls (17) are all located in the ratchet groove (19). The outer sides of the pawls (17) are in contact with the groove wall of the ratchet groove (19).

3. The combined welding torch according to claim 1, characterized in that: Two fixing rods (20) are arranged on the side of the fixed seat (11) away from the second roller (13). Two through holes are respectively opened in a vertical direction on one side of the box body (9). The two through holes are respectively movably sleeved on the two fixing rods (20). Springs (21) and first nuts (22) are respectively sleeved on the two fixing rods (20). The two sides of the springs (21) are respectively in contact with the inner wall of the box body (9) and the fixed seat (11). The first nuts (22) are threadedly sleeved on the fixing rods (20). The first nuts (22) are located outside the box body (9). The fixing rods (20) are clamped on the box body (9) through the springs (21) and the first nuts (22).

4. The combined welding torch according to claim 3, characterized in that: A fixing sleeve (23) is arranged on the outer side of the box body (9). The fixing sleeve (23) is movably sleeved on a fixing rod (20). The inner diameter of the fixing sleeve (23) is in conformity with the diameter of the fixing rod (20). One end of the fixing sleeve (23) is mounted on the box body (9). The fixing sleeve (23) is communicated with the box body (9) through a perforation formed in the box body (9). One side of a first nut (22) is in contact with the other end of the fixing sleeve.

5. The combined welding torch according to claim 3, characterized in that: A fixing plate (24) and a second nut (25) are respectively arranged on the outer side of the first nut (22). Two through holes are formed in the fixing plate (24). The two through holes are respectively sleeved on two fixing rods (20). The number of the second nuts (25) is two. The two second nuts (25) are respectively threadedly sleeved on the two fixing rods (20). The fixing plate (24) is pressed on the first nut (22) through the second nuts (25).

6. The combined welding torch according to claim 1, characterized in that: The bottom of the guiding tube (10) adopts a horn-shaped tubular structure. The inner cavity diameter of the bottom end of the guiding tube (10) is not larger than the inner cavity diameter of the middle part of the guiding tube (10).

7. The combined welding torch according to claim 1, wherein: A plurality of guide rails (26) are arranged between the frame (1) and the bracket (2). The plurality of guide rails (26) are all mounted on the frame (1). The plurality of guide rails (26) are all parallel to the rack (6). Slide blocks (27) are respectively arranged on the plurality of guide rails (26). A chute is formed in each slide block (27). The guide rail (26) is movably sleeved in the chute. The cross-sectional shape of the inner cavity of the chute is in conformity with the cross-sectional shape of the guide rail (26). The slide blocks (27) are mounted on the bracket (2).

8. The combined welding torch according to claim 1, characterized in that: A fixing frame (28) is arranged between the bracket (2) and the welding torch body (3). The fixing frame (28) is mounted on the bracket (2). A fixing hole is formed in the fixing frame (28) along the vertical direction. The welding torch body (3) is sleeved in the fixing hole. A threaded hole is formed in one side of the fixing frame (28) away from the bracket (2). The threaded hole is communicated with the fixing hole. A bolt (29) is threadedly sleeved in the threaded hole. One end of the bolt (29) is in contact with the welding torch body (3). The welding torch body (3) is clamped on the fixing frame (28) through the bolt (29).

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