Ventilation duct low error welding device

Abstract

This invention discloses a low-error welding device for ventilation ducts, relating to the field of pipe welding technology. It includes a welding torch body and a torch head, an auxiliary positioning mechanism disposed on one side of the outer wall of the welding torch body and torch head for auxiliary guidance at the interface during pipe welding, a linkage locking mechanism disposed on both sides of the auxiliary positioning mechanism for self-locking to ensure a smooth weld point when encountering non-planar or curved pipe interfaces, and a locking mechanism disposed on the top of the linkage locking mechanism for adjustment and fixation. The low-error welding device for ventilation ducts provided by this invention, with its auxiliary positioning mechanism and linkage locking mechanism, enables the invention to quickly complete the welding steps when welding pipe interfaces, thus simplifying and increasing efficiency while maintaining high precision, thereby reducing welding errors.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, specifically to a low-error welding device for ventilation ducts. Background Technology

[0002] A low-error welding device for ventilation ducts is a piece of equipment needed for welding ventilation ducts. Generally, a welding torch is used for welding. During the fabrication of the ventilation duct, the sheet material used to make the duct is cut and folded. After the sheet material is pressed into the required shape, the joints of the sheet material are welded. Because it is a sheet material that is folded, welding is required at the joints. This welding is to ensure the airtightness of the duct.

[0003] For example, CN113305399A discloses an automatic welding equipment for square ventilation ducts, including a frame and an electrical control box. The equipment is characterized by: a workpiece lifting platform above the frame; a welding system above the workpiece lifting structure; the welding system including a welding torch and a traveling mechanism; the traveling mechanism including a lead screw connected to a first stepper motor; the welding torch fixed on a welding torch holder connected to a sliding box; a slider inside the sliding box connected to the first lead screw and capable of sliding left and right along the lead screw; a crossbeam below the traveling mechanism fixed to the frame; and a one-way clamping mechanism on both the outer and upper sides of the crossbeam. The workpiece lifting platform lifts the workpiece, and the clamping mechanisms clamp and fix the workpiece to the crossbeam. This invention proposes an automatic welding equipment for square ventilation ducts, achieving hole-free welding without filler wire, while also providing convenient height adjustment of the welded parts, a simple equipment structure, and low manufacturing cost.

[0004] Although automated welding equipment for ventilation ducts already exists, it can only weld square-shaped ducts. Ventilation ducts, however, may be installed in different environments and therefore designed in various shapes, such as circular or irregular. For irregularly shaped ducts, manual welding is generally used. While manual welding can be performed according to the duct's shape, it also presents certain problems. Manual welding largely relies on the worker's experience, leading to lower efficiency as welding precision is required. To increase efficiency, multiple workers may be needed, potentially resulting in uneven welds and minor imperfections. Furthermore, since both sides of the duct to be welded are cut, the welded surfaces may not be smooth straight lines but rather curves with slight angles, demanding higher welding skills and increasing labor costs. While high-precision automated equipment exists, its high cost increases production costs for manufacturers. Therefore, ventilation duct welding remains largely manual. Thus, there is a need for auxiliary equipment that can improve both welding efficiency and precision in the manual welding field.

[0005] To address the aforementioned issues, there is an urgent need for innovative design based on the existing low-error welding device for ventilation ducts. Summary of the Invention

[0006] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Specifically, the present invention aims to provide a low-error welding device for ventilation ducts, thereby solving the problem mentioned in the background that accuracy and efficiency cannot be kept synchronized during manual welding.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a low-error welding device for ventilation ducts, comprising a welding torch body and a torch head, an auxiliary positioning mechanism disposed on one side of the outer wall of the welding torch body and the torch head for auxiliary guidance at the interface when welding the duct, a linkage locking mechanism disposed on both sides of the auxiliary positioning mechanism for self-locking to ensure smooth weld points when encountering non-planar or curved duct interfaces, and a locking mechanism disposed on the top of the linkage locking mechanism for adjustment and fixation;

[0008] The auxiliary positioning mechanism includes a connecting rod disposed on one side of the outer wall of the welding torch body and the torch head. One end of the connecting rod is provided with a connecting telescopic rod, and one end of the connecting telescopic rod is connected to a reset plate. An auxiliary head is disposed at the bottom of the outer wall of the reset plate.

[0009] The linkage locking mechanism includes adjustable telescopic rods movably installed on both sides of the connecting rod. One end of the adjustable telescopic rod is connected to a connecting shell. The bottom of the outer wall of the connecting shell is connected to a movable slot. A movable ball is movably disposed on the inner wall of the movable slot.

[0010] Preferably, an auxiliary spring is installed around the outer wall of the connecting telescopic rod, connecting plates are provided on both sides of the outer wall of the reset plate, a push rod is provided on the outer wall of the connecting plate, an installation plate is provided at the bottom of one side of the outer wall of the welding torch body and the torch head, a connector is provided at the bottom of the outer wall of the installation plate, and a flexible hose is connected to one end of the connector.

[0011] Preferably, the inner wall of the connecting shell is provided with a pressing chamber, the inner wall of the pressing chamber is movably provided with a push plate, the bottom of the outer wall of the push plate is connected with a slide rod, one end of the slide rod is surrounded by a return spring, one end of the slide rod is connected with a locking block, and the outer wall of the movable ball is connected with a magnetic roller.

[0012] Preferably, the locking mechanism includes a gear movably connected to the other end of the telescopic rod, a groove is provided on one side of the gear, a locking rod is movably provided on the inner wall of the groove, and a force-bearing rod is provided on the outer wall of the locking rod.

[0013] Preferably, the three-dimensional view of the auxiliary head is cylindrical, and one end of the auxiliary head is conical.

[0014] Preferably, one end of the hose is connected to the inner wall of the pressure chamber, and the inner wall of the pressure chamber is provided with liquid.

[0015] Preferably, the bottom of the outer wall of the push chamber is provided with a cavity, and the slide rod passes through the cavity of the push chamber and is connected to the locking block.

[0016] Preferably, the bottom of the outer wall of the card block is semi-circular, and the bottom of the outer wall of the card block is adapted to the outer wall of the movable ball.

[0017] Preferably, the top of the outer wall of the movable card slot is provided with a cavity, and the diameter of the movable card slot cavity is adapted to the diameter of the card block.

[0018] Preferably, the outer wall of the mounting plate is provided with a cavity, the push rod passes through the cavity of the mounting plate, and the diameter of the push rod is adapted to the diameter of the inner wall of the connector.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. This invention, through its auxiliary positioning mechanism and linkage locking mechanism, enables rapid completion of the welding process when welding pipe joints, ensuring a smooth and precise weld. The conical design of one end of the auxiliary head allows for precise positioning of the welding torch body and nozzle at the pipe joint, ensuring synchronized welding between the torch body and nozzle. Furthermore, the linkage locking mechanism utilizes a movable ball and magnetic roller, allowing the magnetic roller to move at any angle along the outer wall of the pipe, maintaining stability during welding of the torch body and nozzle. This simplifies and increases the efficiency of the welding process while maintaining high precision, thus reducing welding errors.

[0021] 2. This invention provides users with a certain degree of flexibility when welding pipes through an auxiliary positioning mechanism and a linkage locking mechanism. Utilizing the magnetism between the magnetic roller and the pipe, the magnetic roller can roll along the outer wall of the pipe during welding, and its angle can be adjusted at any angle, thus ensuring the flexibility and versatility of this invention. Furthermore, while the connector is rigid, the flexible hose is adjustable, preventing gas blockage caused by slight folding of the hose when adjusting the telescopic rod angle. This multi-angle adjustable design makes this invention highly flexible when dealing with irregularly shaped pipes and improves welding efficiency while minimizing error rates. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the positional structure of the auxiliary positioning mechanism, the linkage locking mechanism, and the locking mechanism of the present invention;

[0024] Figure 3 This is a schematic diagram of the connecting rod portion of the auxiliary positioning mechanism of the present invention;

[0025] Figure 4 This is a schematic diagram of the adjusting telescopic rod part of the linkage locking mechanism of the present invention;

[0026] Figure 5 For the present invention Figure 4 A magnified view of the structure at point A (marked);

[0027] Figure 6 This is a schematic diagram of the structure of the connecting shell and the pressure chamber of the present invention;

[0028] Figure 7This is a cross-sectional view of the internal structure of the linkage locking mechanism of the present invention;

[0029] Figure 8 This is a schematic diagram of the structure of the reset plate and connecting plate of the present invention;

[0030] Figure 9 This is a schematic diagram of the push plate, slide bar, return spring, and locking block of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the movable slot and the movable ball of the present invention;

[0032] Figure 11 This is a schematic diagram of the structure of the connecting plate, connector, and hose of the present invention;

[0033] Figure 12 This is a cross-sectional view of the flexible tube portion of the auxiliary positioning mechanism of the present invention.

[0034] In the diagram: 1. Welding torch body and torch head; 2. Auxiliary positioning mechanism; 201. Connecting rod; 202. Connecting telescopic rod; 203. Auxiliary spring; 204. Reset plate; 205. Auxiliary head; 206. Connecting plate; 207. Push rod; 208. Mounting plate; 209. Connecting head; 210. Hoses; 3. Linkage locking mechanism; 301. Adjusting telescopic rod; 302. Connecting shell; 303. Push chamber; 304. Push plate; 305. Slide rod; 306. Reset spring; 307. Locking block; 308. Movable slot; 309. Movable ball; 310. Magnetic roller; 4. Locking mechanism; 401. Gear; 402. Slide groove; 403. Locking rod; 404. Force rod. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Please see Figures 1 to 12 The present invention provides a technical solution: a low-error welding device for ventilation ducts, including a welding torch body and a torch head 1, an auxiliary positioning mechanism 2 disposed on one side of the outer wall of the welding torch body and the torch head 1 for auxiliary guidance at the interface when welding the duct, a linkage locking mechanism 3 disposed on both sides of the auxiliary positioning mechanism 2 for self-locking to ensure smooth weld points when encountering non-planar or curved duct interfaces, and a locking mechanism 4 disposed on the top of the linkage locking mechanism 3 for adjustment and fixation;

[0037] The auxiliary positioning mechanism 2 includes a connecting rod 201 disposed on one side of the outer wall of the welding torch body and the torch head 1. One end of the connecting rod 201 is provided with a connecting telescopic rod 202. One end of the connecting telescopic rod 202 is connected to a reset plate 204. An auxiliary head 205 is disposed at the bottom of the outer wall of the reset plate 204.

[0038] The linkage locking mechanism 3 includes an adjusting telescopic rod 301 movably installed on both sides of the connecting rod 201. One end of the adjusting telescopic rod 301 is connected to a connecting shell 302. The bottom of the outer wall of the connecting shell 302 is connected to a movable slot 308. A movable ball 309 is movably provided on the inner wall of the movable slot 308.

[0039] In this embodiment, the auxiliary positioning mechanism 2 and the linkage locking mechanism 3 enable the present invention to quickly complete the welding steps when welding pipe interfaces, and ensure the smoothness and accuracy of the weld joint. Due to the conical design of one end of the auxiliary head 205, one end of the auxiliary head 205 can assist in positioning the welding torch body and torch head 1 at the pipe interface, so that the welding torch body and torch head 1 can always keep the welding synchronized with the interface during welding. Furthermore, the linkage locking mechanism 3 utilizes the movable ball 309 and the magnetic roller 310, which allows the magnetic roller 310 to move at any angle on the outer wall of the pipe. This ensures that the welding torch body and torch head 1 are always in a stable state during welding, thus making the welding process simple and efficient, and while maintaining efficiency, it also has very high accuracy, thereby reducing welding errors.

[0040] An auxiliary spring 203 is installed around the outer wall of the connecting telescopic rod 202. Connecting plates 206 are provided on both sides of the outer wall of the reset plate 204. A push rod 207 is provided on the outer wall of the connecting plate 206. A mounting plate 208 is provided at the bottom of one side of the outer wall of the welding torch body and the torch head 1. A connector 209 is provided at the bottom of the outer wall of the mounting plate 208. One end of the connector 209 is connected to a flexible hose 210.

[0041] In this embodiment, the auxiliary head 205 will first touch these protrusions. When the auxiliary head 205 touches the protrusions, it will be pushed up, causing the connecting telescopic rod 202 and the auxiliary spring 203 to retract. When the connecting telescopic rod 202 and the auxiliary spring 203 retract, they will cause the reset plate 204 to move slightly upward. When the reset plate 204 moves, it will cause the connecting plate 206 to move synchronously. When the connecting plate 206 moves, it will cause the push rod 207 to move. When the push rod 207 moves, it will push the gas in the inner wall of the connector 209 and the hose 210 towards the inner wall of the pressure chamber 303. The inner wall of the pressure chamber 303 contains liquid, which cannot be squeezed. This makes the liquid... This will cause the push plate 304 to move downwards. When the push plate 304 moves downwards, it will cause the slide rod 305 to move. When the slide rod 305 moves, one end of it will cause the locking block 307 to move. After the locking block 307 moves, it will provide the cavity of the movable slot 308 to contact the movable ball 309 on its inner wall. In this way, the movable ball 309 is limited by the friction between the locking block 307 and the movable ball 309 (the connector 209 is rigid, while the hose 210 has a certain degree of adjustability. This ensures that when the push rod 207 moves, the hose 210 will not be slightly folded when the user adjusts the angle of the telescopic rod 301, thus preventing air blockage).

[0042] The inner wall of the connecting shell 302 is provided with a push chamber 303, the inner wall of the push chamber 303 is movably provided with a push plate 304, the bottom of the outer wall of the push plate 304 is connected with a slide rod 305, one end of the slide rod 305 is surrounded by a return spring 306, one end of the slide rod 305 is connected with a locking block 307, and the outer wall of the movable ball 309 is connected with a magnetic roller 310.

[0043] In this embodiment, the movable ball 309 is in a movable state. When the movable ball 309 is in a movable state, it can handle the situation where the welding joint of some irregular pipes is curved. This is because the auxiliary head 205 can move along any shape of gap, and the magnetic roller 310 can turn in any direction, so that precise guidance can be provided when welding curves. (Using the magnetism between the magnetic roller 310 and the pipe, the magnetic roller 310 can roll along the outer wall of the pipe when the user is welding, and the magnetic roller 310 can be adjusted at any angle, thereby ensuring the flexibility and versatility of the present invention.)

[0044] The locking mechanism 4 includes a gear 401 that is movably connected to the other end of the telescopic rod 301. A groove 402 is provided on one side of the gear 401. A locking rod 403 is movably provided on the inner wall of the groove 402. A force-bearing rod 404 is provided on the outer wall of the locking rod 403.

[0045] In this embodiment, the user can rotate the adjustment telescopic rod 301 by hand. There are two adjustment telescopic rods 301, so the user can adjust them according to the surface of the pipe. The two adjustment telescopic rods 301 can be rotated to different angles so that the magnetic roller 310 can be pressed against the outer wall of the pipe. Then, the adjustment telescopic rod 301 needs to be fixed. The user only needs to turn the force rod 404, which will drive the locking rod 403 to slide on the inner wall of the slide groove 402. This will cause one end of the locking rod 403 to lock onto the tooth groove of the gear 401, and then the gear 401 will be locked. After the gear 401 is locked, the adjustment telescopic rod 301 is fixed.

[0046] The three-dimensional view of the auxiliary head 205 is cylindrical, and one end of the auxiliary head 205 is conical.

[0047] In this embodiment, one end of the auxiliary head 205 is inserted into the gap formed at the pipe welding joint. The user can then hold the welding torch body and torch head 1 and move them to one side for welding. During welding, one end of the auxiliary head 205 moves along the gap in the pipe, thus guiding the welding of the welding torch body and torch head 1. Because the welding edge of the pipe is cut, it may be uneven with small protrusions. The auxiliary head 205 will first touch these protrusions. When the auxiliary head 205 touches the protrusions, it is pushed up, causing the connecting telescopic rod 202 and auxiliary spring 203 to retract. The connecting telescopic rod 202 and auxiliary spring 203 retract... When the time comes, the reset plate 204 will move slightly upward (the conical design of the auxiliary head 205 allows the auxiliary head 205 to move along the gap of the pipe weld joint, thereby guiding the welding process and improving the welding efficiency. The auxiliary head 205 can detect unevenness in the pipe interface and can adaptively drive the other mechanisms to adjust, thus ensuring the flexibility of the equipment. Although there is a small distance between the auxiliary head 205 and the nozzle, which may cause a lack of guidance at the end of the welding, pipe welding is generally quite long, and the lack of guidance for only the last small section will not affect the overall weld).

[0048] One end of the hose 210 is connected to the inner wall of the pressure chamber 303, and the inner wall of the pressure chamber 303 is provided with liquid.

[0049] In this embodiment, the inner wall of the pressure chamber 303 contains liquid, which cannot be squeezed. This causes the liquid to move the push plate 304 downward. When the push plate 304 moves downward, it will move the slide rod 305. When the slide rod 305 moves, one end of it will move the locking block 307. After the locking block 307 moves, it will provide the cavity of the movable slot 308 to contact the movable ball 309 on its inner wall. In this way, the movable ball 309 is limited by the friction between the locking block 307 and the movable ball 309, so that the movable ball 309 cannot move. This keeps the magnetic roller 310 in a fixed state and will not cause the welding line to deviate due to the protrusion of the inner wall of the pipe. Instead, it can continue welding completely along the original route (using the property that the liquid cannot be squeezed, i.e., the hydraulic principle, to generate friction between the locking block 307 and the movable ball 309, thereby using the locking block 307 to limit the movable ball 309. The material of the locking block 307 is rubber, which can increase the friction of the movable ball 309).

[0050] The bottom of the outer wall of the push chamber 303 is provided with a cavity, and the slide rod 305 passes through the cavity of the push chamber 303 and is connected to the locking block 307.

[0051] In this embodiment, after the card block 307 moves, it provides the cavity of the movable card slot 308 with contact with the movable ball 309 on its inner wall. In this way, the movable ball 309 is limited by the friction between the card block 307 and the movable ball 309, so that the movable ball 309 cannot move. This keeps the magnetic roller 310 in a fixed state, and the welding line will not be deviated due to the protrusion of the inner wall of the pipe. Instead, the welding can continue to be welded completely along the original route.

[0052] The bottom of the outer wall of the card block 307 is semi-circular, and the bottom of the outer wall of the card block 307 is adapted to the outer wall of the movable ball 309.

[0053] In this embodiment, when the slide bar 305 is reset, it will drive the locking block 307 back to its original position, so that the movable ball 309 is in a movable state. When the movable ball 309 is in a movable state, it can handle the situation where the welding joint of some irregular pipes is curved, because the auxiliary head 205 can move along any shape of gap, and the magnetic roller 310 can turn in any direction, so that precise guidance can be performed when welding curves.

[0054] The top of the outer wall of the movable card slot 308 is provided with a cavity, and the diameter of the cavity of the movable card slot 308 is adapted to the diameter of the card block 307.

[0055] In this embodiment, when the connecting plate 206 moves, it drives the push rod 207 to move. When the push rod 207 moves, it pushes the gas inside the connector 209 and the hose 210 towards the inner wall of the pressure chamber 303. The inner wall of the pressure chamber 303 contains liquid, which cannot be squeezed. This causes the liquid to drive the push plate 304 to move downward. When the push plate 304 moves downward, it drives the slide rod 305 to move. When the slide rod 305 moves, one end of it drives the locking block 307 to move. After the locking block 307 moves, it provides a cavity for the movable slot 308 to contact the movable ball 309 on its inner wall. In this way, the movable ball 309 is limited by the friction between the locking block 307 and the movable ball 309.

[0056] The outer wall of the mounting plate 208 is provided with a cavity, and the push rod 207 passes through the cavity of the mounting plate 208. The diameter of the push rod 207 is adapted to the diameter of the inner wall of the connector 209.

[0057] In this embodiment, when the reset plate 204 moves, it will drive the connecting plate 206 to move synchronously. When the connecting plate 206 moves, it will drive the push rod 207 to move. When the push rod 207 moves, it will push the gas in the connector 209 and the inner wall of the hose 210 towards the inner wall of the pressure chamber 303 (the reset plate 204 is set at one end of the connecting telescopic rod 202, and the mounting plate 208 is set at the bottom of the outer wall of the welding torch body and the torch head 1).

[0058] Working principle: When using this low-error welding device for ventilation ducts, the user first holds the welding torch body and torch head 1. Then, the user adjusts the device according to the shape of the plate to be welded. The user can rotate the adjusting telescopic rod 301. There are two adjusting telescopic rods 301, which can be adjusted according to the surface of the duct. The two adjusting telescopic rods 301 can be rotated to different angles so that the magnetic rollers 310 can be pressed against the outer wall of the duct. After that, the adjusting telescopic rods 301 need to be fixed. The user only needs to turn the force bar 404. The force rod 404 drives the locking rod 403 to slide on the inner wall of the slide groove 402, so that one end of the locking rod 403 is locked on the tooth groove of the gear 401, and then the gear 401 can be locked. After the gear 401 is locked, the telescopic rod 301 can be adjusted to fix it. Since one end of the magnetic roller 310 is connected to the movable ball 309, and the movable ball 309 is spherical and can move on the inner wall of the movable slot 308, the user can use the magnetism between the magnetic roller 310 and the outer wall of the pipe to make the magnetic roller 310 roll along the outer wall of the pipe at any angle.

[0059] Secondly, at the start of welding, the user needs to insert one end of the auxiliary head 205 into the gap formed at the pipe welding joint. Then, the user can hold the welding torch body and torch head 1 and move them to one side for welding. During welding, one end of the auxiliary head 205 will move along the gap in the pipe, thus guiding the welding of the welding torch body and torch head 1. Because the welding edge of the pipe is cut, there may be slight protrusions due to unevenness. The auxiliary head 205 will first touch these protrusions. When the auxiliary head 205 touches the protrusions, it will be pushed up, causing the connecting telescopic rod 202 and auxiliary spring 203 to retract. When the connecting telescopic rod 202 and auxiliary spring 203 retract, they will cause the reset plate 204 to move slightly upward. The movement of the reset plate 204 will cause the connecting plate 206 to move synchronously. The moving connecting plate 206 will... The push rod 207 is moved, and when the push rod 207 moves, it pushes the gas inside the connector 209 and the hose 210 towards the inner wall of the pressure chamber 303. The inner wall of the pressure chamber 303 contains liquid, which cannot be squeezed. This causes the liquid to move the push plate 304 downward. When the push plate 304 moves downward, it moves the slide rod 305. When the slide rod 305 moves, one end of it moves the locking block 307. After the locking block 307 moves, it provides the cavity of the movable slot 308 to contact the movable ball 309 on its inner wall. In this way, the friction between the locking block 307 and the movable ball 309 limits the movable ball 309, making it unable to move. This keeps the magnetic roller 310 in a fixed state, and the welding line will not be deviated due to the protrusion of the inner wall of the pipe. Instead, the welding can continue to follow the original route.

[0060] Finally, when the auxiliary head 205 disengages from the pipe protrusion, without the protrusion's limiting force, the auxiliary head 205 will reset via the resetting of the connecting telescopic rod 202 and the auxiliary spring 203. This resets the reset plate 204, thereby resetting the connecting plate 206 and the push rod 207. Since the push rod 207's thrust is gone, the reset spring 306 at one end of the slide rod 305 will drive the slide rod 305 to reset. During reset, the slide rod 305 will cause the locking block 307 to return to its original position, making the movable ball 309 movable. When the movable ball 309 is movable, it can handle curved weld joints on irregularly shaped pipes, as the auxiliary head 205 can move along any shape of gap, and the magnetic roller 310 can rotate in any direction, allowing for precise guidance even when welding curves.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-error welding device for ventilation ducts, comprising a welding torch body and a torch head (1), characterized in that: It also includes an auxiliary positioning mechanism (2) set on one side of the outer wall of the welding torch body and torch head (1) for auxiliary guidance at the interface when welding the pipe; a linkage locking mechanism (3) set on both sides of the auxiliary positioning mechanism (2) for self-locking to ensure smooth weld when encountering non-planar or curved pipe interfaces; and a locking mechanism (4) set on the top of the linkage locking mechanism (3) for adjustment and fixation. The auxiliary positioning mechanism (2) includes a connecting rod (201) disposed on one side of the outer wall of the welding torch body and the torch head (1). One end of the connecting rod (201) is provided with a connecting telescopic rod (202), and one end of the connecting telescopic rod (202) is connected to a reset plate (204). An auxiliary head (205) is disposed at the bottom of the outer wall of the reset plate (204). The linkage locking mechanism (3) includes an adjustment telescopic rod (301) movably installed on both sides of the connecting rod (201). One end of the adjustment telescopic rod (301) is connected to a connecting shell (302). The bottom of the outer wall of the connecting shell (302) is connected to a movable slot (308). A movable ball (309) is movably arranged on the inner wall of the movable slot (308).

2. The low-error welding device for ventilation ducts according to claim 1, characterized in that: An auxiliary spring (203) is installed around the outer wall of the connecting telescopic rod (202). A connecting plate (206) is provided on both sides of the outer wall of the reset plate (204). A push rod (207) is provided on the outer wall of the connecting plate (206). A mounting plate (208) is provided at the bottom of one side of the outer wall of the welding torch body and the torch head (1). A connector (209) is provided at the bottom of the outer wall of the mounting plate (208). A flexible hose (210) is connected to one end of the connector (209).

3. The low-error welding device for ventilation ducts according to claim 1, characterized in that: The inner wall of the connecting shell (302) is provided with a pressing chamber (303), and the inner wall of the pressing chamber (303) is movably provided with a push plate (304). The bottom of the outer wall of the push plate (304) is connected with a slide rod (305). One end of the slide rod (305) is surrounded by a return spring (306), and one end of the slide rod (305) is connected with a locking block (307). The outer wall of the movable ball (309) is connected with a magnetic roller (310).

4. The low-error welding device for ventilation ducts according to claim 1, characterized in that: The locking mechanism (4) includes a gear (401) movably connected to the other end of the telescopic rod (301). A groove (402) is provided on one side of the gear (401). A locking rod (403) is movably provided on the inner wall of the groove (402). A force-bearing rod (404) is provided on the outer wall of the locking rod (403).

5. The low-error welding device for ventilation ducts according to claim 1, characterized in that: The three-dimensional view of the auxiliary head (205) is cylindrical, and one end of the auxiliary head (205) is conical.

6. The low-error welding device for ventilation ducts according to claim 2, characterized in that: One end of the hose (210) is connected to the inner wall of the pressure chamber (303), and the inner wall of the pressure chamber (303) is provided with liquid.

7. The low-error welding device for ventilation ducts according to claim 3, characterized in that: The bottom of the outer wall of the push chamber (303) is provided with a cavity, and the slide rod (305) passes through the cavity of the push chamber (303) and is connected to the locking block (307).

8. The low-error welding device for ventilation ducts according to claim 3, characterized in that: The bottom of the outer wall of the card block (307) is semi-circular, and the bottom of the outer wall of the card block (307) is adapted to the outer wall of the movable ball (309).

9. The low-error welding device for ventilation ducts according to claim 3, characterized in that: The top of the outer wall of the movable slot (308) is provided with a cavity, and the diameter of the cavity of the movable slot (308) is adapted to the diameter of the card block (307).

10. A low-error welding device for ventilation ducts according to claim 2, characterized in that: The outer wall of the mounting plate (208) is provided with a cavity, and the push rod (207) passes through the cavity of the mounting plate (208). The diameter of the push rod (207) is adapted to the diameter of the inner wall of the connector (209).

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