Fillet weld welding device and method for thin-wall small-caliber pipe

Abstract

The invention is suitable for the technical field of pipeline welding, and particularly relates to a fillet weld welding device and method for a thin-wall small-caliber pipe. A lifting mechanism is mounted on the base, a lifting seat is mounted on the lifting mechanism, and a clamping mechanism is mounted on the lifting seat; a fixed guide ring is fixedly installed on the lifting base, a set of sliding gear rings are arranged on the fixed guide ring in a sliding mode, a first welding mechanism and a second welding mechanism are installed at the two ends of the sliding gear rings correspondingly, distance sensors are installed on the first welding mechanism and the second welding mechanism correspondingly, and a sixth motor is fixedly installed on the lifting base; a first gear is fixedly mounted on an output shaft of the sixth motor and engaged with the sliding gear ring. The to-be-welded pipe is pre-cut according to the size of the base pipe, the end of the to-be-welded pipe can be attached to the outer edge of the base pipe, welding is facilitated, automatic welding can be achieved through the two welding mechanisms, the stability of a welding seam is guaranteed, and the product quality is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline welding, and particularly relates to a fillet weld welding device and method for thin-walled small-diameter pipes. Background Art

[0002] Fillet weld welding is a common welding process, mainly used to connect the edges of two workpieces that are perpendicular or nearly perpendicular to each other. During this welding process, the weld is formed at the junction of two materials and is distributed along the joint line, usually presenting a triangular cross-sectional shape. Fillet welds can not only provide good structural support but also enhance the overall strength and stability of the connected components. This welding method is widely used in construction, bridge manufacturing, shipbuilding, and the production of various metal structures.

[0003] During the production process, when welding thin-walled small-diameter pipes, due to their characteristics, the welds are often uneven during manual welding, and the welding stability is poor, affecting the use of the products. Summary of the Invention

[0004] The purpose of the present invention is to provide a fillet weld welding device for thin-walled small-diameter pipes, aiming to solve the problems of uneven welds and poor welding stability during manual welding, which affect the use of products.

[0005] The present invention is implemented as follows. A fillet weld welding device for thin-walled small-diameter pipes, the device comprising:

[0006] A base, on which a conveying mechanism is installed, and the conveying mechanism is used for conveying the base pipe;

[0007] A lifting mechanism is installed on the base through a bracket, a lifting seat is installed on the lifting mechanism, and a clamping mechanism is installed on the lifting seat, and the clamping mechanism is used for clamping the pipe to be welded;

[0008] A fixed guide ring is fixedly installed on the lifting seat, a set of sliding tooth rings are slidably arranged on the fixed guide ring, a first welding mechanism and a second welding mechanism are respectively installed at both ends of the sliding tooth ring, distance sensors are installed on both the first welding mechanism and the second welding mechanism, a sixth motor is fixedly installed on the lifting seat, and a first gear is fixedly installed on the output shaft of the sixth motor, and the first gear meshes with the sliding tooth ring.

[0009] Preferably, each of the first welding mechanism and the second welding mechanism includes a set of guide cylinders. A fourth motor is fixedly installed on the guide cylinder. A second screw rod is fixedly connected to the output shaft of the fourth motor. A guide block is slidably arranged in the guide cylinder. An avoidance groove is arranged below the guide cylinder. The guide block slides along the avoidance groove below. A first telescopic rod and a second telescopic rod are rotatably connected to the guide block. The telescopic ends of the first telescopic rod and the second telescopic rod are respectively rotatably connected to a lifting ring and a guiding ring. A first welding torch and a second welding torch are respectively fixedly connected to the two lifting rings. The two guiding rings are respectively slidably connected to the first welding torch and the second welding torch. A distance sensor is fixedly installed on the guide cylinder.

[0010] Preferably, the conveying mechanism includes a first sliding seat. A second screw rod is rotatably installed on the base. The second screw rod is connected to the first sliding seat through a thread. A first guiding rod is arranged on the base. The first guiding rod is slidably connected to the base. A plurality of mounting seats are fixedly installed on the first sliding seat. Two rollers are rotatably installed on the mounting seat. The two rollers are arranged in the same plane. One of the rollers is driven by a first motor. The two rollers are arranged in a V shape.

[0011] Preferably, the lifting mechanism includes a slider. A plurality of second guiding rods are fixedly arranged on the bracket. A plurality of sliders are provided. The slider is fixedly installed on the lifting seat. The slider is slidably connected to the second guiding rod. Two first screw rods are also rotatably arranged on the bracket. The first screw rod is connected to the lifting seat through a thread. A pulley is fixedly installed at the end of the first screw rod. The two pulleys are connected by a transmission belt. One of the first screw rods is driven by a second motor. The second motor is fixedly installed on the bracket.

[0012] Preferably, the clamping mechanism includes a first clamping arm and a second clamping arm. Two guiding sleeves are fixedly arranged on the lifting seat. Two third guiding rods are respectively slidably arranged in the two guiding sleeves. The two third guiding rods are respectively fixedly connected to the first clamping arm and the second clamping arm. Rack teeth are fixedly installed on both the first clamping arm and the second clamping arm. A second gear is rotatably arranged on the lifting seat. The second gear meshes with the two rack teeth at the same time. The second gear is driven by a fifth motor fixedly installed on the lifting seat. A mounting plate is installed on both the first clamping arm and the second clamping arm. A plurality of electromagnets are fixedly installed on the mounting plate. The mounting plate is fixedly connected to a clamping piece through a connecting block. A plurality of magnetic blocks are fixedly arranged on the side of the clamping piece close to the mounting plate.

[0013] Preferably, an anti-slip layer is arranged on the clamping piece.

[0014] Another object of the present invention is to provide a method for fillet welding of thin-walled small-diameter pipes, which is applied to the fillet welding device for thin-walled small-diameter pipes as described above. The method includes:

[0015] Place the base pipe on the conveying mechanism, drive the distance sensor to move through the movement of the clamping mechanism, and model according to the detection data of the distance sensor to determine the size of the base pipe;

[0016] Clamp the pipe to be welded through the clamping mechanism, and pre-cut the pipe to be welded according to the size of the base pipe to obtain the pre-treated pipe to be welded;

[0017] Simultaneously weld the pipe to be welded through the first welding mechanism and the second welding mechanism to complete the welding operation.

[0018] The fillet weld welding device for thin-walled small-diameter pipes provided by the present invention can automatically identify the size of the base pipe by setting a distance sensor, pre-cut the pipe to be welded according to the size of the base pipe, so that the end of the pipe to be welded can fit the outer edge of the base pipe, which is convenient for welding. The automatic welding can be realized through two groups of welding mechanisms, ensuring the stability of the weld and improving the product quality. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the first perspective of a fillet weld welding device for thin-walled small-diameter pipes provided by an embodiment of the present invention;

[0020] Figure 2 It is a schematic structural diagram of the second perspective of a fillet weld welding device for thin-walled small-diameter pipes provided by an embodiment of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the third perspective of a fillet weld welding device for thin-walled small-diameter pipes provided by an embodiment of the present invention;

[0022] Figure 4 is Figure 1 The partial enlarged view of part A in;

[0023] Figure 5 is Figure 3 The partial enlarged view of part B in.

[0024] In the drawings: 1. Base; 2. Second screw; 3. First sliding seat; 4. Mounting seat; 5. Roller; 6. First motor; 7. Bracket; 8. Second motor; 9. Transmission belt; 10. Belt pulley; 11. First screw; 12. Lifting seat; 13. Slide block; 14. Second guide rod; 15. Mounting plate; 16. Clamping piece; 17. Electromagnet; 18. Magnetic block; 19. First clamping arm; 20. Second clamping arm; 21. Guide sleeve; 22. Third guide rod; 23. Third motor; 24. First welding torch; 25. Second welding torch; 26. First telescopic rod; 27. Second telescopic rod; 28. Fourth motor; 29. Guide cylinder; 30. Fixed guide ring; 31. Sliding tooth ring; 32. Fifth motor; 33. Sixth motor; 34. First gear; 35. Distance sensor. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0027] As Figure 1 , Figure 2 and Figure 3 shown, a fillet weld welding device for a thin-walled small-diameter pipe provided by an embodiment of the present invention includes:

[0028] A base 1, on which a conveying mechanism is installed, and the conveying mechanism is used to convey a base pipe;

[0029] A lifting mechanism is installed on the base 1 through a bracket 7, a lifting seat 12 is installed on the lifting mechanism, and a clamping mechanism is installed on the lifting seat 12, and the clamping mechanism is used to clamp the pipe to be welded;

[0030] A fixed guide ring 30 is fixedly installed on the lifting seat 12, a set of sliding gear rings 31 are slidably arranged on the fixed guide ring 30, a first welding mechanism and a second welding mechanism are respectively installed at both ends of the sliding gear ring 31, distance sensors 35 are installed on both the first welding mechanism and the second welding mechanism, a sixth motor 33 is fixedly installed on the lifting seat 12, and a first gear 34 is fixedly installed on the output shaft of the sixth motor 33, and the first gear 34 meshes with the sliding gear ring 31.

[0031] In the embodiment of the present invention, during welding, the base pipe is placed on the conveying mechanism, and the conveying mechanism is used to control the base pipe to move along the axis or perpendicular to the axis in the horizontal plane. The pipe to be welded is placed in the clamping mechanism, and the diameter of the pipe to be welded is detected by the clamping mechanism. The distance sensor 35 is controlled to scan the surface of the base pipe, so as to determine the diameter of the base pipe according to the scanning result. After determining the diameter of the base pipe and the diameter of the pipe to be welded, the end of the pipe to be welded is cut so that the end of the pipe to be welded fits against the outer wall of the base pipe. Subsequently, the sixth motor 33 drives the first gear 34 to rotate, the first gear 34 meshes with the sliding gear ring 31, and the sliding gear ring 31 slides along the fixed guide ring 30 to drive the first welding mechanism and the second welding mechanism to rotate around the pipe to be welded, so as to weld along the contact line between the pipe to be welded and the base pipe.

[0032] As Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, as a preferred embodiment of the present invention, the first welding mechanism and the second welding mechanism each include a set of guide cylinders 29. A fourth motor 28 is fixedly installed on the guide cylinder 29. A second screw rod is fixedly connected to the output shaft of the fourth motor 28. A guide block is slidably arranged in the guide cylinder 29. An avoidance groove is arranged below the guide cylinder 29. The lower part of the guide block slides along the avoidance groove. A first telescopic rod 26 and a second telescopic rod 27 are rotatably connected to the guide block. The telescopic ends of the first telescopic rod 26 and the second telescopic rod 27 are respectively rotatably connected to a lifting ring and a guiding ring. A first welding torch 24 and a second welding torch 25 are respectively fixedly connected to the two lifting rings. The two guiding rings are respectively slidably connected to the first welding torch 24 and the second welding torch 25. A distance sensor 35 is fixedly installed on the guide cylinder 29.

[0033] In this embodiment, during welding, both the first welding mechanism and the second welding mechanism can perform welding. The fixed guiding ring 30 is an incomplete ring, and the included angle between the line connecting its center and the two ends of the ring is greater than 180 degrees. A guiding groove is provided on it. The sliding tooth ring 31 is an incomplete ring, and the included angle between the line connecting its center and the two ends of the ring is greater than 200 degrees. The first welding mechanism and the second welding mechanism are respectively fixed at both ends of the sliding tooth ring 31. The sliding tooth ring 31 is slidably arranged in the guiding groove. The guide cylinder 29 is fixedly installed on the sliding tooth ring 31. The guide cylinder 29 is a hollow structure, and a guide block is slidably installed inside it. A protrusion is provided at the bottom of the guide block. An avoidance groove is arranged below the guide cylinder 29. The protrusion slides in the avoidance groove. After the fourth motor 28 is started, it will drive the guide block to slide in the guide cylinder 29. The guide block is rotatably connected to the first telescopic rod 26 and the second telescopic rod 27 through the protrusion. A lifting ring and a guiding ring are respectively rotatably connected to the first telescopic rod 26 and the second telescopic rod 27. The lifting ring in the first welding mechanism is fixedly connected to the first welding torch 24. The lifting ring in the second welding mechanism is fixedly connected to the second welding torch 25. The guiding ring in the first welding mechanism is slidably connected to the first welding torch 24. The guiding ring in the second welding mechanism is slidably connected to the second welding torch 25. Then, with the cooperation of the first telescopic rod 26 and the second telescopic rod 27, the first welding torch 24 and the second welding torch 25 can be driven to lift and the welding angle of the welding torch can be adjusted. By cooperating with the fourth motor 28, the position of the welding point can be changed to match the edge of the pipe to be welded, ensuring the welding quality.

[0034] Such as Figure 1 、 Figure 2 and Figure 3As shown, as a preferred embodiment of the present invention, the conveying mechanism includes a first sliding seat 3. A second screw rod 2 is rotatably installed on the base 1. The second screw rod 2 is connected to the first sliding seat 3 by threads. A first guiding rod is provided on the base 1. The first guiding rod is slidably connected to the base 1. A plurality of groups of mounting seats 5 are fixedly installed on the first sliding seat 3. Two groups of rollers 5 are rotatably installed on the mounting seats 5. The two groups of rollers 5 are arranged in the same plane. One of the two groups of rollers 5 is driven by a first motor 6. The two groups of rollers 5 are arranged in a V shape.

[0035] In this embodiment, when it is necessary to control the base pipe to move along the axis in the horizontal plane, the first motor 6 is started. The first motor 6 drives some of the rollers 5 to rotate, so as to realize the axial conveying of the base pipe. When it is necessary to control the base pipe to move perpendicular to the axis in the horizontal plane, the motor for driving the second screw rod 2 is started, defined as the seventh motor. When the second screw rod 2 rotates, the first sliding seat 3 slides along the first guiding rod to realize the movement of the base pipe.

[0036] As Figure 1 、 Figure 2 and Figure 3 shown, as a preferred embodiment of the present invention, the lifting mechanism includes a slider 13. A plurality of groups of second guiding rods 14 are fixedly arranged on the bracket 7. A plurality of groups of sliders 13 are provided. The sliders 13 are fixedly installed on the lifting seat 12. The sliders 13 are slidably connected to the second guiding rods 14. Two groups of first screw rods 11 are also rotatably arranged on the bracket 7. The first screw rods 11 are connected to the lifting seat 12 by threads. A pulley 10 is fixedly installed at the end of the first screw rod 11. The two pulleys 10 are connected by a transmission belt 9. One of the two groups of first screw rods 11 is driven by a second motor 8. The second motor 8 is fixedly installed on the bracket 7.

[0037] In this embodiment, when it is necessary to control the lifting of the lifting seat 12, the second motor 8 is started. The second motor 8 drives the pulley 10 to rotate. The pulleys 10 are connected by a transmission belt 9. Therefore, the pulleys 10 will rotate synchronously to drive the two groups of first screw rods 11 to rotate synchronously, so as to control the lifting of the lifting seat 12. By setting the second guiding rods 14, the lifting stability of the lifting seat 12 can be ensured.

[0038] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, as a preferred embodiment of the present invention, the clamping mechanism includes a first clamping arm 19 and a second clamping arm 20. Two sets of guide sleeves 21 are fixedly arranged on the lifting seat 12. Two sets of third guide rods 22 are slidably arranged in the two sets of guide sleeves 21 respectively. The two sets of third guide rods 22 are fixedly connected to the first clamping arm 19 and the second clamping arm 20 respectively. Rack teeth are fixedly installed on both the first clamping arm 19 and the second clamping arm 20. A set of second gears is rotatably arranged on the lifting seat 12. The second gears are simultaneously engaged with the two sets of rack teeth. The second gears are driven by a fifth motor 32 fixedly installed on the lifting seat 12. A set of mounting plates 15 is installed on both the first clamping arm 19 and the second clamping arm 20. Multiple electromagnets 17 are fixedly installed on the mounting plates 15. The mounting plates 15 are fixedly connected with clamping pieces 16 through connecting blocks. A plurality of magnetic blocks 18 are fixedly arranged on one side of the clamping piece 16 close to the mounting plate 15.

[0039] As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown in, as a preferred embodiment of the present invention, an anti-slip layer is provided on the clamping piece 16.

[0040] In this embodiment, when it is necessary to clamp the pipe to be welded, place it into the core of the fixed guide ring 30. At this time, start the fifth motor 32. Use the fifth motor 32 to drive the second gear to rotate. The second gear is engaged with the two sets of rack teeth, thereby driving the first clamping arm 19 and the second clamping arm 20 to approach each other. At this time, the third guide rod 22 slides in the guide sleeve 21, and the two sets of mounting plates 15 approach each other. Pressure sensors are arranged on the surface of the clamping piece 16 to detect whether it contacts the pipe to be welded. When the pressure values detected by the pressure sensors on the two clamping pieces 16 both reach the preset value, control the two sets of mounting plates 15 to stop moving. At this time, the electromagnets 17 are energized. Use the magnetic field generated by the electromagnets 17 to repel the magnetic blocks on the clamping piece 16, so that the clamping piece 16 adheres to the outer wall of the pipe to be welded to form a horizontal clamping effect. By changing the magnetic field intensity, the clamping force can be changed to avoid deforming the pipe to be welded.

[0041] In an embodiment of the present invention, a method for fillet welding of thin-walled small-diameter pipes is provided, which is applied to the fillet welding device for thin-walled small-diameter pipes as described above. The method includes:

[0042] Place the base pipe on the conveying mechanism. Drive the distance sensor 35 to move through the movement of the clamping mechanism. Model according to the detection data of the distance sensor 35 to determine the size of the base pipe.

[0043] In this step, place the base pipe between the rollers 5. By rotating the rollers 5, the movement of the base pipe along the axis can be controlled. At this time, control the sliding gear ring 31 to rotate along the fixed guide ring 30. Two groups of distance sensors 35 will measure the distance of the base pipe below. At this time, the rotation axis of the sliding gear ring 31 is perpendicular to and intersects with the axis of the base pipe. The two groups of distance sensors 35 will perform circular motion. The detection points of the distance sensors 35 on the base pipe will form a line of intersection. In a three-dimensional coordinate system, with the rotation center of the distance sensor 35 as the origin, each group of measurement values is marked as three-dimensional coordinates in this coordinate system, so as to form a group of line-of-intersection curves in the three-dimensional coordinate system. Calculate the diameter of the base pipe according to the line-of-intersection curves. Specifically, in the three-dimensional coordinate system, a model of the base pipe can also be constructed. Assume that its axis is the Z-axis, the center is at the origin, and the equation is:

[0044] x 2 +y 2 =R A 2

[0045] Among them, R A is the diameter of the base pipe;

[0046] Project downward along the path of the distance sensor 35 to form a projection cylinder, which is defined as a projection pipe, and its radius is R B , which is a known value. Assume that its axis is the X-axis, the center is at the origin, and the equation is:

[0047] z 2 +y 2 =R B 2

[0048] The line of intersection is formed by the intersection of the projection pipe and the base pipe. (x, y, z) represents a point in this three-dimensional coordinate system. The coordinates of each point on the line of intersection can be determined according to the plane where the distance sensor 35 is located. Since the line of intersection exists both on the base pipe and on the projection pipe, it will simultaneously satisfy the above two equations. Substitute the coordinates on the line of intersection into the above two groups of equations one by one, and solve to obtain the radius R A of the base pipe.

[0049] Clamp the pipe to be welded through the clamping mechanism, and pre-cut the pipe to be welded according to the size of the base pipe to obtain the pre-treated pipe to be welded.

[0050] Simultaneously perform welding treatment on the pipe to be welded through the first welding mechanism and the second welding mechanism to complete the welding operation.

[0051] In this step, the pipe to be welded is placed inside the clamping mechanism and clamped by the clamping mechanism. When placing the pipe to be welded, the end of the pipe to be welded abuts against the upper surface of the base pipe. A V-shaped positioning groove is provided in the middle of the clamping piece 16 to keep the pipe to be welded in a vertical state. At this time, the axis of the pipe to be welded is perpendicular to the axis of the base pipe. The diameter of the pipe to be welded is determined according to the moving distance of the mounting plate 15 (converted according to the number of running circles of the fifth motor 32). Since the pipe to be welded intersects the base pipe perpendicularly, the shape of the weld between the two is the same as the intersection line between the two. The shape of the intersection line is determined according to the dimensions of the pipe to be welded and the base pipe, so as to control the first welding torch 24 and the second welding torch 25 to cut the pipe to be welded synchronously, so that the cross section of the pipe to be welded can fit the base pipe. After determining the dimensions of the base pipe, the two groups of welding torches move to the lowest position, that is, contact with the upper surface of the base pipe. At this time, the welding point is at the same height as the pipe to be welded. The pipe to be welded is cut by the welding torch. During this process, according to the calculated intersection line, the two groups of welding torches are controlled to rotate and lift to complete the cutting of the pipe to be welded; after the cutting is completed, the pipe to be welded is driven to move downward so that the pipe to be welded abuts against the base pipe, and then welding is carried out again according to the intersection line between the pipe to be welded and the base pipe;

[0052] When cutting the pipe to be welded, control the base pipe to move radially in the horizontal plane to prevent the waste generated by cutting from falling on the base pipe and affecting subsequent welding.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An angular weld welding device for a thin-walled small-diameter pipe, characterized in that, The device includes: a base (1) on which a conveying mechanism is installed for conveying a base pipe; a lifting mechanism is installed on the base (1) through a bracket (7), a lifting seat (12) is installed on the lifting mechanism, and a clamping mechanism is installed on the lifting seat (12) for clamping a pipe to be welded; a fixed guide ring (30) is fixedly installed on the lifting seat (12), a set of sliding tooth rings (31) are slidably arranged on the fixed guide ring (30), a first welding mechanism and a second welding mechanism are respectively installed at both ends of the sliding tooth ring (31), distance sensors (35) are installed on both the first welding mechanism and the second welding mechanism, a sixth motor (33) is fixedly installed on the lifting seat (12), and a first gear (34) is fixedly installed on the output shaft of the sixth motor (33), and the first gear (34) meshes with the sliding tooth ring (31).

2. The fillet weld welding device for thin-walled small-diameter pipes according to claim 1, wherein, Each of the first welding mechanism and the second welding mechanism includes a set of guide cylinders (29), a fourth motor (28) is fixedly installed on the guide cylinder (29), a second screw rod is fixedly connected to the output shaft of the fourth motor (28), a guide block is slidably arranged in the guide cylinder (29), an avoidance groove is arranged below the guide cylinder (29), the guide block slides along the avoidance groove below, a first telescopic rod (26) and a second telescopic rod (27) are rotatably connected to the guide block, the telescopic ends of the first telescopic rod (26) and the second telescopic rod (27) are respectively rotatably connected to a lifting ring and a guide ring, a first welding torch (24) and a second welding torch (25) are respectively fixedly connected to the two lifting rings, the two guide rings are respectively slidably connected to the first welding torch (24) and the second welding torch (25), and a distance sensor (35) is fixedly installed on the guide cylinder (29).

3. The fillet weld welding device for thin-walled small-diameter pipes according to claim 1, wherein, The conveying mechanism includes a first sliding seat (3), a second screw rod (2) is rotatably installed on the base (1), the second screw rod (2) is connected to the first sliding seat (3) through a thread, a first guide rod is arranged on the base (1), the first guide rod is slidably connected to the base (1), a plurality of mounting seats (5) are fixedly installed on the first sliding seat (3), two sets of rollers (5) are rotatably installed on the mounting seats (5), the two sets of rollers (5) are arranged in the same plane, and one of the sets of rollers (5) is driven by a first motor (6), and the two sets of rollers (5) are arranged in a V shape.

4. The fillet weld welding device for thin-walled small-diameter pipes according to claim 1, characterized in that, The lifting mechanism includes a slider (13), a plurality of second guide rods (14) are fixedly arranged on the bracket (7), a plurality of sliders (13) are provided, the sliders (13) are fixedly installed on the lifting seat (12), the sliders (13) are slidably connected to the second guide rods (14), two sets of first screw rods (11) are also rotatably arranged on the bracket (7), the first screw rods (11) are connected to the lifting seat (12) through a thread, a pulley (10) is fixedly installed at the end of the first screw rod (11), the two pulleys (10) are connected by a transmission belt (9), and one of the first screw rods (11) is driven by a second motor (8), and the second motor (8) is fixedly installed on the bracket (7).

5. The fillet weld welding device for thin-walled small-caliber pipes according to claim 1, characterized in that, The clamping mechanism includes a first clamping arm (19) and a second clamping arm (20). Two groups of guide sleeves (21) are fixedly arranged on the lifting seat (12). Two groups of third guide rods (22) are slidably arranged in the two groups of guide sleeves (21) respectively. The two groups of third guide rods (22) are fixedly connected to the first clamping arm (19) and the second clamping arm (20) respectively. Rack teeth are fixedly installed on both the first clamping arm (19) and the second clamping arm (20). A second gear is rotatably arranged on the lifting seat (12). The second gear meshes with the two sets of rack teeth at the same time. The second gear is driven by a fifth motor (32) fixedly installed on the lifting seat (12). A set of mounting plates (15) are installed on both the first clamping arm (19) and the second clamping arm (20). Multiple electromagnetic magnets (17) are fixedly installed on the mounting plates (15). The mounting plates (15) are fixedly connected to clamping pieces (16) through connecting blocks. Multiple magnetic blocks (18) are fixedly arranged on one side of the clamping pieces (16) close to the mounting plates (15).

6. The fillet weld welding device for thin-walled small-diameter pipes according to claim 5, characterized in that, An anti-slip layer is provided on the clamping piece (16).

7. A fillet weld welding method for a thin-walled small-diameter pipe, characterized in that, Applied to the fillet weld welding device for thin-walled small-diameter pipes as described in any one of claims 1-6, the method includes: Placing the base pipe on the conveying mechanism, driving the distance sensor (35) to move through the movement of the clamping mechanism, and modeling according to the detection data of the distance sensor (35) to determine the size of the base pipe; Clamping the pipe to be welded by the clamping mechanism, and pre-cutting the pipe to be welded according to the size of the base pipe to obtain the pre-treated pipe to be welded; Simultaneously performing welding treatment on the pipe to be welded by the first welding mechanism and the second welding mechanism to complete the welding operation.

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