Automatic welder, automatic welding system and method of automatic welding of a bent pipe

Abstract

This invention discloses an automatic welding machine, an automatic welding system, and a method for automatically welding bent pipes, relating to the technical field of pipe bending equipment. The invention includes an operating table, a fixed frame, an adjusting turntable, movable sliding columns, guide rollers, and a welding torch. The fixed frame is installed in the mounting opening of the operating table. The adjusting turntable has an arc-shaped guide groove. The movable sliding column is slidably mounted on the fixed frame, and the guide roller is located on the movable sliding column and within the arc-shaped guide groove. This invention achieves precise adjustment of the distance between the welding torch and the bent pipe by using the arc-shaped guide groove to compress the guide roller as the adjusting turntable rotates, causing multiple sets of movable sliding columns and the welding torch to move synchronously inward or outward. This is suitable for uniform preheating and welding of bent pipes of different diameters. The positioning rod and positioning hole work together to achieve quick locking and unlocking, making operation convenient. This invention has a compact structure, precise adjustment, and strong versatility, effectively improving the quality and efficiency of pipe bending welding.

Description

Technical Field

[0001] This application relates to the technical field of pipe bending equipment, and in particular to automatic welding machines, automatic welding systems and methods for automatically welding pipe bends. Background Technology

[0002] Pipe bends are a widely used form of pipe fitting in industrial piping systems, playing an important role in fields such as automotive exhaust pipes, air conditioning refrigeration pipes, construction scaffolding, and petrochemical pipelines. Pipe welding is a key process in pipe bending, involving heating to melt the plastic or metal materials at the pipe joint, allowing molecular diffusion and penetration at the contact surface to ultimately achieve a permanent connection.

[0003] Traditional pipe bending welding equipment typically employs a fixed heating nozzle structure when welding pipe bends of varying diameters. Because bends have both curved and straight sections, the cross-sectional shape of the pipe may slightly deform after bending, and the distance between the pipe wall and the heating nozzle varies with the pipe diameter. For smaller diameter bends, the pipe wall is farther from the heating nozzle, resulting in low heating efficiency and uneven preheating; for larger diameter bends, the pipe wall is too close to the heating nozzle, easily causing localized overheating or even burn-through. Furthermore, preheating of the pipe ends is required before welding, and the preheating effect directly affects the strength and sealing of the weld joint. The existing equipment's heating nozzle spacing adjustment is cumbersome and difficult to quickly adapt to bends of different diameters and bending angles, leading to unstable welding quality and low production efficiency.

[0004] Therefore, in order to solve the above problems, this application provides an automatic welding machine, an automatic welding system, and a method for automatically welding pipe bends. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic welding machine, an automatic welding system, and a method for automatically welding pipe bends, in order to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows: An automatic welding machine includes an operating table. The top of the operating table has an installation opening, and support legs are installed at the four corners of the bottom of the operating table. A fixed frame is installed inside the installation opening. An adjusting turntable is provided at one end of the fixed frame. Several sets of arc-shaped guide grooves are arranged in a circular array on the outside of the adjusting turntable. Several sets of movable sliding columns are arranged in a circular array on the fixed frame. Guide rollers are installed on the outer ring surface of the movable sliding columns and inside the arc-shaped guide grooves. A welding gun head is installed at one end of the movable sliding column.

[0007] In some embodiments of this application, the top of the operating table is symmetrically equipped with support frames at both ends, and each end of the support frame is equipped with an adjusting screw. A clamping plate is installed at one end of the adjusting screw. The position of the clamping plate can be adjusted by rotating the adjusting screw, thereby clamping pipe bends of different diameters, enabling the equipment to adapt to bends of different sizes and improving versatility.

[0008] In some embodiments of this application, a guide slide rod is installed between the inner sidewalls of the support frame, and a sliding block is installed at the bottom of the clamping plate and on the outer ring surface of the guide slide rod. When the adjusting screw adjusts the position of the clamping plate, the clamping plate will move smoothly along the guide slide rod to ensure the stability and accuracy of clamping.

[0009] In some embodiments of this application, an annular groove is provided on one outer end of the fixed frame, and a positioning ring is installed on the outer edge of one end of the adjusting turntable. The outer dimensions of the positioning ring are adapted to the inner wall dimensions of the annular groove, so that the adjusting turntable can rotate smoothly on the fixed frame.

[0010] In some embodiments of this application, the outer ring surface of the movable slide column is slidably connected to the interior of the fixed frame. When the adjusting turntable rotates, it squeezes the guide roller to move through the arc-shaped guide groove. When the guide roller moves, it drives multiple sets of movable slide columns to slide synchronously inward or outward on the fixed frame, thereby driving multiple sets of welding gun heads to approach or move away from the outer wall of the bent pipe, so as to achieve precise adjustment of the distance between the welding gun head and the bent pipe.

[0011] In some embodiments of this application, a telescopic sleeve rod is installed at one end of the outer ring surface of the adjusting turntable, a return spring is installed on the outer ring surface of the telescopic sleeve rod, a pull plate is installed at one end of the telescopic sleeve rod, and a positioning insert rod is installed at the end of the outer side of the pull plate away from the telescopic sleeve rod.

[0012] In some embodiments of this application, a plurality of positioning protrusions are installed on one end of the outer ring surface of the fixing frame. The positioning protrusions are provided with positioning holes. The outer ring surface size of the positioning rod is adapted to the inner sidewall size of the positioning hole. By pulling the pull plate outward, the telescopic sleeve and the return spring are stretched synchronously, so that the positioning rod moves away from the positioning hole, making it convenient for the user to quickly rotate the adjustment dial to the desired position. After the pull plate is released, the positioning rod is inserted into the corresponding positioning hole under the action of the return spring, locking the adjustment dial.

[0013] In some embodiments of this application, a handle is installed on one end of the adjustment dial, allowing the user to easily rotate the adjustment dial, making operation convenient.

[0014] Some embodiments of this application disclose an automated control system, including an automatic welding machine as described in any of the above claims, and a control device; the control device is connected to the adjustment turntable of the automatic welding machine and is used to drive the adjustment turntable to rotate, so as to drive multiple sets of movable sliding columns and the welding gun heads at their ends to move synchronously radially through the cooperation of the arc-shaped guide groove and the guide roller, thereby adjusting the distance between the welding gun head and the outer wall of the bent pipe to be welded.

[0015] Some embodiments of this application disclose a pipe bending welding method, using an automatic welding machine as described in any of the above claims, comprising the following steps: Step 1: Place the bent pipe to be welded on the support frame, rotate the adjusting screw to move the clamping plate along the guide slide to clamp the bent pipe to be welded; Step 2: Pull the pull plate outward to disengage the positioning rod from the positioning hole and release the lock on the adjustment turntable; Step 3: Rotate the adjustment turntable, and squeeze the guide roller through the arc-shaped guide groove, driving multiple sets of movable sliding columns to slide synchronously inward or outward on the fixed frame, so that the welding gun head and the outer wall of the bent pipe to be welded reach the preset welding distance. Step 4: Release the pull plate, and the positioning rod is inserted into the corresponding positioning hole under the action of the reset spring to lock the adjustment dial; Step 5: Start the welding torch and weld the area to be welded on the bent pipe fitting.

[0016] Compared with existing technologies, the advantages of this invention are that the automatic welding machine can stably clamp pipe bends of different diameters by adjusting the position of the clamping plate through rotating the adjusting screw, enabling the equipment to adapt to the welding needs of various specifications of pipe bends and significantly improving its versatility. Rotating the handle causes the adjusting turntable to rotate, and the arc-shaped guide groove squeezes the guide rollers to slide. The guide rollers drive multiple sets of movable sliding columns to slide synchronously inward or outward on the fixed frame, thereby causing multiple sets of welding torches to move synchronously closer to or further away from the outer wall of the pipe bend, achieving precise adjustment of the distance between the welding torch and the pipe bend. This is suitable for uniform preheating and welding of pipe bends of different diameters. Pulling the pull plate outward disengages the positioning rod from the positioning hole, allowing for quick unlocking of the adjusting turntable and adjustment to the desired angle. After releasing the pull plate, the positioning rod automatically resets and inserts into the corresponding positioning hole to complete the locking. The operation is simple and quick, effectively improving the adjustment efficiency and positioning accuracy of pipe bend welding. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is the present invention. Figure 1 A partial structural diagram on the right; Figure 3 This is the present invention. Figure 2 Partial structural layering diagram; Figure 4 This is the present invention. Figure 3 Partial structural diagram.

[0018] Explanation of reference numerals in the attached drawings: 1. Operating table; 101. Mounting port; 2. Support leg; 3. Fixing frame; 301. Annular slide groove; 4. Adjusting turntable; 401. Arc-shaped guide groove; 5. Movable slide column; 6. Guide roller; 7. Welding torch head; 8. Bearing frame; 9. Adjusting screw; 10. Clamping plate; 11. Guide slide rod; 12. Sliding block; 13. Positioning ring; 14. Telescopic sleeve rod; 15. Return spring; 16. Pull plate; 17. Positioning insert rod; 18. Positioning protrusion; 1801. Positioning hole; 19. Handle. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] To better understand the purpose, structure, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings.

[0021] An automatic welding machine, as described above Figure 1 - Figure 4The system includes an operating table 1, with an installation port 101 at its top and support legs 2 at each of the four corners at its bottom. A mounting frame 3 is installed inside the installation port 101. An adjusting turntable 4 is located at one end of the mounting frame 3. The adjusting turntable 4 has several sets of arc-shaped guide grooves 401 arranged in a circular array on its outer surface. Several sets of movable sliding columns 5 are also arranged in a circular array on the mounting frame 3. Guide rollers 6 are installed on the outer ring surface of the movable sliding columns 5, located inside the arc-shaped guide grooves 401. A welding torch head 7 is installed at one end of each movable sliding column 5. When the adjusting turntable 4 rotates, the arc-shaped guide grooves 401 compress the guide rollers 6, causing them to slide along the groove trajectory. The guide rollers 6 drive the movable sliding columns 5 to slide synchronously inwards or outwards on the mounting frame 3, thereby allowing multiple welding torch heads 7 to simultaneously approach or move away from the outer wall of the bent pipe fitting. This achieves precise adjustment of the distance between the welding torch head 7 and the bent pipe fitting, ensuring uniform preheating and welding effects for bent pipe fittings of different diameters.

[0022] Reference Figure 1 - Figure 2 The top of the operating platform 1 is symmetrically equipped with support frames 8 at both ends. Adjusting screws 9 are installed on both ends of the support frames 8, and clamping plates 10 are installed at one end of each screw 9. The position of the clamping plates 10 can be adjusted by rotating the adjusting screws 9, thereby clamping pipe bends of different diameters. This allows the equipment to adapt to pipe bends of different sizes, improving its versatility. Guide slide rods 11 are installed between the inner walls of the support frames 8. Sliding blocks 12 are installed at the bottom of the clamping plates 10 and on the outer ring surface of the guide slide rods 11. When the adjusting screws 9 adjust the position of the clamping plates 10, the clamping plates 10 will move smoothly along the guide slide rods 11, ensuring the stability and accuracy of the clamping and preventing the pipe bends from shifting during welding.

[0023] Reference Figure 1 - Figure 3 The outer ring surface of the movable sliding column 5 is slidably connected to the inside of the fixed frame 3. When the adjusting turntable 4 rotates, it presses the guide roller 6 to move through the arc-shaped guide groove 401. When the guide roller 6 moves, it drives multiple sets of movable sliding columns 5 to slide synchronously inward or outward on the fixed frame 3, thereby driving multiple sets of welding torch heads 7 to move closer to or away from the outside of the bent pipe, realizing the synchronous adjustment of the distance between the welding torch head 7 and the bent pipe. This structure ensures that multiple sets of welding torch heads 7 are always evenly distributed around the outer wall of the bent pipe, ensuring the uniformity of heating.

[0024] Reference Figure 3 An annular groove 301 is provided on one outer end of the fixed frame 3. A positioning ring 13 is installed on the outer edge of one end of the adjusting turntable 4. The outer dimensions of the positioning ring 13 are adapted to the inner wall dimensions of the annular groove 301, so that the adjusting turntable 4 can rotate smoothly on the fixed frame 3. A handle 19 is installed on one outer end of the adjusting turntable 4, which allows the user to easily rotate the adjusting turntable 4 by holding the handle 19, making operation convenient.

[0025] Reference Figure 4 A telescopic sleeve 14 is installed at one end of the outer ring surface of the adjusting turntable 4. A return spring 15 is installed on the outer ring surface of the telescopic sleeve 14. A pull plate 16 is installed at one end of the telescopic sleeve 14. A positioning insert 17 is installed at the end of the outer side of the pull plate 16 away from the telescopic sleeve 14. Several sets of positioning protrusions 18 are installed at one end of the outer ring surface of the fixing frame 3. Positioning protrusions 18 have positioning holes 1801. The outer ring surface size of the positioning insert 17 is adapted to the inner wall size of the positioning hole 1801. By pulling the pull plate 16 outward, the telescopic sleeve 14 and the return spring 15 are stretched simultaneously, so that the positioning insert 17 is away from the positioning hole 1801. At this time, the user can freely rotate the adjusting turntable 4 to adjust the spacing. After the adjustment is in place, the pull plate 16 is released, the return spring 15 retracts and drives the telescopic sleeve 14 to return to its original position, and the positioning insert 17 automatically inserts into the corresponding positioning hole 1801 to lock the adjusting turntable 4, ensuring that the spacing between the welding torch head 7 and the bent pipe remains constant during the welding process.

[0026] The implementation principle of an automatic welding machine according to an embodiment of this application is as follows: During the use of this equipment, the bent pipe fitting to be welded is first placed between two sets of support frames 8 above the operating table 1. The position of the clamping plate 10 is adjusted by rotating the adjusting screw 9, so that the clamping plate 10 fits against the outer walls of both ends of the bent pipe fitting, thereby securely clamping bent pipe fittings of different diameters. When the clamping plate 10 moves, it slides smoothly along the guide slide rod 11 via the sliding block 12, ensuring accurate clamping. Subsequently, according to the pipe diameter of the bent pipe fitting, the pull plate 16 is pulled outward, stretching the telescopic sleeve rod 14 and the return spring 15, causing the positioning insertion rod 17 to disengage from the positioning hole 1801, releasing the locking state of the adjusting turntable 4. Hold handle 19 and rotate the adjusting turntable 4. As the turntable 4 rotates, the arc-shaped guide groove 401 presses the guide roller 6 to slide along the groove trajectory. The guide roller 6 drives multiple sets of movable sliding columns 5 to slide synchronously inward or outward on the fixed frame 3, thereby causing multiple sets of welding torch heads 7 to synchronously approach or move away from the outer wall of the bent pipe fitting until the distance between the welding torch head 7 and the outer wall of the bent pipe fitting reaches the required preheating welding distance. Release the pull plate 16, the return spring 15 returns to its original position, and the positioning rod 17 automatically inserts into the corresponding positioning hole 1801, locking the adjusting turntable 4. Start the welding torch head 7 to uniformly preheat and weld the bent pipe fitting. The multiple sets of welding torch heads 7 are arranged in a ring around the pipe fitting, ensuring consistent heating at the interface between the arc and straight sections, effectively improving the quality and sealing of the bent pipe weld joint.

[0027] Reference Figures 1 to 4 This application also provides an automated control system, which includes the automatic welding machine described in any of the above embodiments, and a control device.

[0028] Specifically, the control device is connected to the adjusting turntable 4 of the automatic welding machine via a transmission connection. In one embodiment, the control device can be a servo motor, stepper motor, or other drive mechanism capable of outputting rotary motion. The output shaft of the control device is connected to one end of the adjusting turntable 4 or the mounting position of the handle 19 via a transmission structure such as a coupling, gear pair, or synchronous belt pulley. After receiving an external command, the control device outputs rotary motion, driving the adjusting turntable 4 to rotate around its axis.

[0029] When the adjusting turntable 4 rotates, the arc-shaped guide groove 401 on it compresses the guide roller 6 to slide along the groove trajectory. The guide roller 6 is fixedly installed on the outer ring surface of the movable slide column 5, so the sliding of the guide roller 6 drives multiple sets of movable slide columns 5 to slide synchronously inward or outward on the fixed frame 3. The end of the movable slide column 5 is equipped with a welding gun head 7, so that multiple sets of welding gun heads 7 move radially synchronously, approaching or moving away from the outer wall of the bent pipe to be welded, realizing the automatic adjustment of the distance between the welding gun head 7 and the outer wall of the bent pipe.

[0030] During the automatic adjustment process, when it is necessary to change the spacing, pull the pull plate 16 outward to disengage the positioning rod 17 from the positioning hole 1801 and release the lock on the adjustment turntable 4; then the control device drives the adjustment turntable 4 to rotate to the target position; after the adjustment is in place, release the pull plate 16, the return spring 15 retracts to automatically insert the positioning rod 17 into the corresponding positioning hole 1801, lock the adjustment turntable 4, and keep the spacing between the welding torch head 7 and the outer wall of the bent pipe constant.

[0031] This automated control system drives the adjustment turntable to rotate via a control device, replacing the original manual operating handle and achieving automated adjustment of the welding torch tip spacing. It also retains the original welding machine's synchronous linkage mechanism between the arc-shaped guide groove and guide rollers, as well as the locking mechanism between the positioning rod and the positioning hole, ensuring adjustment accuracy and welding stability.

[0032] Reference Figures 1 to 4 This application also provides a method for welding bent pipes, which uses the automatic welding machine described in any of the above embodiments and includes the following steps: Step 1: Place the bent pipe fitting to be welded between the two sets of support frames 8 above the operating table 1, so that the area to be welded is located in the center of the fixed frame 3. Rotate the adjusting screws 9 at both ends of the support frame 8. The adjusting screws 9 drive the clamping plate 10 to move along the guide slide rod 11 until the clamping plate 10 clamps both ends of the bent pipe fitting to be welded, ensuring that the bent pipe fitting to be welded remains stable during the welding process.

[0033] Step 2: Pull the pull plate 16 outward. The pull plate 16 stretches the telescopic sleeve 14 and the return spring 15, causing the positioning insert 17 to disengage from the positioning hole 1801 of the positioning protrusion 18 on the fixed frame 3, thereby releasing the lock on the adjusting turntable 4.

[0034] Step 3: Hold handle 19 and rotate the adjusting turntable 4. As the adjusting turntable 4 rotates, the arc-shaped guide groove 401 on it presses the guide roller 6 to slide along the groove trajectory. The guide roller 6 drives multiple sets of movable sliding columns 5 to slide synchronously inward or outward on the fixed frame 3. The movable sliding columns 5 drive the welding gun head 7 at their ends to move radially synchronously, so that the welding gun head 7 gradually approaches or moves away from the outer wall of the bent pipe to be welded, until the welding gun head 7 and the outer wall of the bent pipe to be welded reach the preset welding distance.

[0035] Step 4: Loosen the pull plate 16, the return spring 15 retracts and drives the telescopic sleeve 14 to return to its original position, the positioning rod 17 automatically inserts into the positioning hole 1801 that is now aligned with it, and locks the adjusting turntable 4 to keep the distance between the welding gun head 7 and the outer wall of the bent pipe constant.

[0036] Step 5: Start the welding torch head 7. Multiple welding torch heads 7 will uniformly preheat the welding area around the outer wall of the bent pipe fitting to be welded. After preheating, continue welding until the weld joint is formed. After welding is completed, turn off the welding torch head 7. After the workpiece has cooled, loosen the adjusting screw 9 and remove the welded bent pipe fitting. This completes the entire welding operation.

[0037] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic welding machine, characterized in that: The system includes an operating table (1), with an installation port (101) on the top of the operating table (1) and support legs (2) installed at the four corners of the bottom of the operating table (1). A fixed frame (3) is installed inside the installation port (101). An adjusting turntable (4) is provided at one end of the fixed frame (3). Several sets of arc-shaped guide grooves (401) are arranged in a ring on the outside of the adjusting turntable (4). Several sets of movable sliding columns (5) are arranged in a ring on the fixed frame (3). Guide rollers (6) are installed on the outer ring surface of the movable sliding column (5) and inside the arc-shaped guide groove (401). A welding gun head (7) is installed at one end of the movable sliding column (5).

2. An automatic welding machine according to claim 1, characterized in that: The top of the operating table (1) is symmetrically equipped with a support frame (8), and an adjusting screw (9) is installed on both ends of the support frame (8). A clamping plate (10) is installed on one end of the adjusting screw (9).

3. An automatic welding machine according to claim 2, characterized in that: A guide slide rod (11) is installed between the inner sidewalls of the support frame (8), and a sliding block (12) is installed at the bottom of the clamping plate (10) and on the outer ring surface of the guide slide rod (11).

4. An automatic welding machine according to claim 1, characterized in that: An annular groove (301) is provided on one end of the fixed frame (3), and a positioning ring (13) is installed on the outer edge of one end of the adjusting turntable (4). The outer dimensions of the positioning ring (13) are adapted to the inner wall dimensions of the annular groove (301).

5. An automatic welding machine according to claim 1, characterized in that: The outer ring surface of the movable slide column (5) is slidably connected to the inside of the fixed frame (3), and the adjusting turntable (4) moves by squeezing the guide roller (6) through the arc-shaped guide groove (401) when it rotates.

6. An automatic welding machine according to claim 1, characterized in that: A telescopic sleeve rod (14) is installed at one end of the outer ring surface of the adjusting turntable (4). A return spring (15) is installed on the outer ring surface of the telescopic sleeve rod (14). A pull plate (16) is installed at one end of the telescopic sleeve rod (14). A positioning insert rod (17) is installed at the end of the outer side of the pull plate (16) away from the telescopic sleeve rod (14).

7. An automatic welding machine according to claim 6, characterized in that: A number of positioning protrusions (18) are installed on one end of the outer ring surface of the fixing frame (3). The positioning protrusions (18) are provided with positioning holes (1801). The outer ring surface size of the positioning rod (17) is adapted to the inner wall size of the positioning hole (1801).

8. An automatic welding machine according to claim 1, characterized in that: A handle (19) is installed on one end of the outer side of the adjustment turntable (4).

9. An automated control system, characterized in that, The automatic welding machine as described in any one of claims 1 to 8, and a control device; the control device is connected to the adjustment turntable (4) of the automatic welding machine and is used to drive the adjustment turntable (4) to rotate so that, through the cooperation of the arc-shaped guide groove (401) and the guide roller (6), multiple sets of movable sliding columns (5) and the welding gun heads (7) at their ends are moved radially synchronously to adjust the distance between the welding gun head (7) and the outer wall of the bent pipe to be welded.

10. A method for welding bent pipes, characterized in that, The automatic welding machine as described in any one of claims 1 to 8 comprises the following steps: Step 1: Place the bent pipe to be welded on the support frame (8), rotate the adjusting screw (9) to move the clamping plate (10) along the guide slide (11) to clamp the bent pipe to be welded; Step 2: Pull the pull plate (16) outward to disengage the positioning rod (17) from the positioning hole (1801) and release the lock on the adjustment turntable (4); Step 3: Rotate the adjustment turntable (4) and squeeze the guide roller (6) through the arc-shaped guide groove (401), driving multiple sets of movable sliding columns (5) to slide inward or outward synchronously on the fixed frame (3), so that the welding gun head (7) and the outer wall of the bent pipe to be welded reach the preset welding distance. Step 4: Release the pull plate (16), and the positioning rod (17) is inserted into the corresponding positioning hole (1801) under the action of the reset spring (15) to lock the adjusting turntable (4). Step 5: Start the welding torch (7) and weld the area to be welded on the bent pipe fitting.

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