Large-diameter thick-wall steel pipe welding device for inverted siphon construction

Abstract

This invention discloses a welding device for large-diameter thick-walled steel pipes used in inverted siphon construction, specifically relating to the field of steel pipe welding. The device includes: a frame with two sets of support mechanisms mounted on it, used to position and support a tapered steel pipe; each support mechanism includes two support components capable of synchronous and opposite-directional movement, supporting the tapered steel pipe through these components. The contact area between the support components and the tapered steel pipe is a support zone, with the support zone having the same taper as the outer wall of the tapered steel pipe, ensuring the tapered steel pipe remains horizontal; the support components also include an adjustment mechanism for adjusting the taper of the support zone. This invention provides stable support for the tapered pipe using the support mechanisms, ensuring it remains horizontal during welding. Furthermore, the adjustment mechanism allows the device to support tapered pipes of varying tapers while maintaining their horizontal position.

Description

Technical Field

[0001] This invention relates to the field of steel pipe welding technology, and more specifically, to a welding device for large-diameter thick-walled steel pipes used in inverted siphon construction. Background Technology

[0002] Inverted siphon construction refers to the use of gravity and air pressure in pipeline engineering to allow liquid to flow through a pipe above the storage level, achieving the purpose of drainage or transportation. Its basic principle is similar to the siphon phenomenon, but the difference is that the inverted siphon pipe design allows the liquid to flow in the opposite direction, and it is usually used in specific terrains or environments.

[0003] The pipes used in inverted siphon construction are typically formed by welding multiple steel pipes together. Currently, the welding between steel pipes usually involves placing two steel pipes horizontally and then welding their ends together to fix them in place. However, the pipes used in inverted siphon construction often include tapered pipes with different diameters at both ends. As the water flows, the cross-sectional area of ​​the tapered pipe gradually decreases, which can effectively increase the fluid velocity. During the liquid flow process, the increased velocity helps maintain the liquid's dynamics, avoids stagnation in valves or pipes, and thus improves the overall system efficiency.

[0004] In the construction of an inverted siphon, the conical pipe is mainly formed by welding multiple conical steel pipes in sequence. However, due to the conical shape of the steel pipes, when welding two conical steel pipes together, in order to ensure the horizontal placement of the two conical steel pipes, it is necessary to install support components that match the taper of the conical steel pipes. This ensures the horizontal placement of the conical steel pipes before welding. However, when welding conical steel pipes with different tapers, it is necessary to replace the support components. Since the conical steel pipes are large-diameter, thick-walled steel pipes, their overall weight is large, so the support components need to have sufficient strength and rigidity. Therefore, the weight of the support components is usually also large, which makes the replacement of the support components cumbersome and inconvenient. Furthermore, the replaced support components also need to be precisely adjusted to ensure that they are in a stable horizontal state to support the conical steel pipes. Summary of the Invention

[0005] The present invention provides a welding device for large-diameter thick-walled steel pipes used in inverted siphon construction. The problem to be solved is that existing methods for welding two tapered steel pipes require the use of support components that match the taper of the tapered steel pipes to ensure that the tapered steel pipes are placed horizontally before welding. However, when welding tapered steel pipes with different tapers, the support components need to be replaced. Since the tapered steel pipes are large-diameter thick-walled steel pipes, their overall weight is large, so the support components need to have sufficient strength and rigidity. Therefore, the weight of the support components is usually also large, which makes the replacement of the support components cumbersome and inconvenient. Furthermore, the replaced support components also need to be precisely adjusted to ensure that they are in a stable horizontal state to support the tapered steel pipes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a welding device for large-diameter thick-walled steel pipes for inverted siphon construction, comprising: a frame, on which two sets of support mechanisms are provided, the support mechanisms being used to position and support the tapered steel pipes;

[0007] The support mechanism includes two support components that can move synchronously in opposite directions. The tapered steel pipe is supported by the two support components, and the contact position between the support components and the tapered steel pipe is the support area. The support area has the same taper as the outer wall of the tapered steel pipe, so that the tapered steel pipe can be in a horizontal state.

[0008] The support assembly is also equipped with an adjustment mechanism, which is used to adjust the taper of the support area to support tapered steel pipes with different tapers;

[0009] The frame is also equipped with a welding mechanism, which includes a welding torch that can move along the welding trajectory. The welding torch is used to weld two tapered steel pipes along the welding trajectory.

[0010] In a preferred embodiment, the support mechanism further includes a base, on which a lead screw is provided, and two slide blocks are slidably disposed on the base. Both slide blocks are threadedly connected to the lead screw, and two support components are respectively disposed on the corresponding slide blocks.

[0011] In a preferred embodiment, the adjustment mechanism is an adjustment component one, which includes a rotatably configured connecting shaft and a support roller one detachably mounted on the connecting shaft.

[0012] In a preferred embodiment, the support roller 1 includes two support plates 1, a positioning hole is provided on the connecting shaft, and a positioning shaft is provided on each of the two support plates 1. The support plates 1 are positioned and installed on the connecting shaft through the positioning shaft and the positioning hole. A side plate is installed on the connecting shaft, and a fastener 1 is provided on the side plate. The support plates 1 are fixedly installed on the connecting shaft through the fastener 1.

[0013] In a preferred embodiment, the adjustment mechanism is an adjustment component two, which includes a support roller two, which includes multiple support plates two, and a fastener two is provided on the connecting shaft. The multiple support plates two are all fixedly installed on the connecting shaft by the fastener two, and the outer wall taper of the multiple support plates two is different. A power component is installed on the slide, and the output end of the power component is fixedly connected to the connecting shaft.

[0014] In a preferred embodiment, a positioning mechanism is provided on the frame. The positioning mechanism includes a drive component, the output end of which is equipped with a threaded shaft. A push plate is slidably provided on the frame and is threadedly connected to the threaded shaft. A guide rail is provided on the frame, and the push plate is slidably provided on the guide rail. The push plate is used to push the tapered steel pipe to move.

[0015] In a preferred embodiment, a gap separating mechanism is provided on the frame. The gap separating mechanism includes a fixed ring, which is fixedly installed on the frame. A second driving component is installed on the fixed ring. A partition is installed at the output end of the second driving component. The partition is located between two tapered steel pipes, and both tapered steel pipes are in close contact with the partition.

[0016] In a preferred embodiment, the partition includes two synchronously and oppositely movable abutments. The two abutments are respectively in close contact with the corresponding conical steel pipes. Through the synchronous and opposite movement of the two abutments, the two abutments are separated from the corresponding conical steel pipes, and then the two abutments are driven to move out of the welding trajectory.

[0017] In a preferred embodiment, the welding device further includes a drive mechanism, which includes a fixed base. The fixed base is installed at the output end of the second drive component, and both abutments are slidably disposed within the fixed base. A drive shaft is mounted on the fixed base, and an elliptical wheel is fixedly disposed on the drive shaft. The drive shaft is used to drive the elliptical wheel to rotate. The elliptical wheel is in movable contact with the two abutments, and an elastic element is disposed between the two abutments.

[0018] In a preferred embodiment, the welding mechanism includes a drive component three, which is mounted on a fixed ring. A gear is mounted on the output end of the drive component three. A gear ring is rotatably mounted on the fixed ring. The gear meshes with the gear ring. A connecting plate is fixedly mounted on the gear ring. The welding torch is mounted on the connecting plate. The welding end of the welding torch points to the welding trajectory between the two tapered steel pipes.

[0019] The beneficial effects of this invention are as follows:

[0020] This invention provides stable support for tapered pipes by setting up a support mechanism, ensuring that the tapered pipes remain in a stable horizontal state during welding. Furthermore, by setting up an adjustment mechanism, it is made suitable for providing stable support for tapered pipes of different tapers and maintaining the horizontal state of the tapered pipes.

[0021] This invention solves the problem that the tapered steel pipes are prone to slippage and misalignment due to their weight and the tapered support mechanism by setting a gap separation mechanism, thus ensuring a stable gap between the two tapered steel pipes during welding.

[0022] This invention provides a partition consisting of two synchronously moving butt plates, and a driving mechanism to drive the two butt plates to move in opposite directions. This allows the two butt plates to separate from the corresponding tapered steel pipes when the partition is removed, thus avoiding friction between the butt plates and the tapered steel pipes, which could cause wear and debris and affect the welding quality. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 .

[0024] Figure 2 This is a three-dimensional structural diagram of the support mechanism of the present invention.

[0025] Figure 3 This is a three-dimensional structural diagram of the adjustment component one of the present invention.

[0026] Figure 4 This is a three-dimensional structural diagram of the second adjustment component of the present invention.

[0027] Figure 5 This is a three-dimensional structural diagram of the positioning mechanism of the present invention.

[0028] Figure 6 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 .

[0029] Figure 7 This is a cross-sectional view of the gap separation mechanism of the present invention.

[0030] Figure 8 This is a cross-sectional structural schematic diagram of the driving mechanism of the present invention.

[0031] Figure 9 This is a schematic diagram of another working state of the drive mechanism of the present invention.

[0032] Figure 10 for Figure 1 Enlarged view of section A.

[0033] The attached figures are labeled as follows: 1. Frame; 2. Support mechanism; 21. Base; 22. Lead screw; 23. Slide; 24. Support assembly; 3. Adjustment assembly one; 31. Connecting shaft; 311. Positioning hole; 32. Support roller one; 321. Positioning shaft; 33. Side plate; 34. Fastener one; 4. Adjustment assembly two; 41. Support roller two; 42. Fastener two; 43. Power component; 5. Tapered steel pipe; 6. Positioning mechanism; 61. Drive component one; 62. Threaded shaft; 63. Push plate; 64. Guide rail; 7. Gap separation mechanism; 71. Fixing ring; 72. Drive component two; 73. Partition plate; 731. Support plate; 8. Drive mechanism; 81. Fixed seat; 82. Drive shaft; 83. Elliptical wheel; 84. Elastic component; 9. Welding mechanism; 91. Drive component three; 92. Gear; 93. Gear ring; 94. Connecting plate; 95. Welding torch. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0035] Refer to the instruction manual appendix Figures 1 to 10 A welding device for large-diameter thick-walled steel pipes used in inverted siphon construction includes: a frame 1, on which two sets of support mechanisms 2 are provided, the support mechanisms 2 being used to position and support the tapered steel pipe 5;

[0036] The support mechanism 2 includes two support components 24 that can move synchronously in opposite directions. The tapered steel pipe 5 is supported by the two support components 24, and the contact position between the support component 24 and the tapered steel pipe 5 is the support area. The support area has the same taper as the outer wall of the tapered steel pipe 5, so that the tapered steel pipe 5 can be in a horizontal state.

[0037] The support assembly 24 is also equipped with an adjustment mechanism, which is used to adjust the taper of the support area to support tapered steel pipes 5 with different tapers;

[0038] The frame 1 is also equipped with a welding mechanism 9, which includes a welding torch 95 that can move along the welding trajectory. The welding torch 95 is used to weld two tapered steel pipes 5 along the welding trajectory.

[0039] It should be noted that the support component 24 is a tapered roller, and the outer wall taper of the roller is the same as the outer wall taper of the tapered steel pipe 5. The adjustment mechanism can be angle adjustment, which can be achieved by pushing the hydraulic cylinder. By adjusting the angle of the roller, the roller can stably support the tapered steel pipe 5 with different tapers.

[0040] The specific implementation scenario is as follows: First, two tapered steel pipes 5 are placed on corresponding support mechanisms 2. The tapered steel pipes 5 are supported by two rollers on the support mechanism 2, so that the support area on the rollers is stably attached to the outer wall of the tapered steel pipe 5. By supporting the tapered steel pipe 5 with rollers whose outer wall taper is the same as that of the tapered steel pipe 5, it can be ensured that the tapered steel pipe 5 is in a horizontal state after being supported. Thus, when welding the two tapered steel pipes 5, they can be kept in a horizontal state for welding, solving the problem that it is difficult to keep the tapered steel pipes 5 in a horizontal state for butt welding due to their shape. Furthermore, when it is necessary to butt weld tapered steel pipes 5 with different tapers, the angle of the rollers can be adjusted so that the support area can be attached to the outer wall of the tapered steel pipe 5, so that the tapered steel pipes 5 with different tapers can be stably supported, ensuring that the tapered steel pipes 5 can be kept in a horizontal state for welding.

[0041] Further, please refer to the appendix to the instruction manual. Figure 2 The support mechanism 2 also includes a base 21, on which a lead screw 22 is provided, and two slide blocks 23 are slidably provided on the base 21. Both slide blocks 23 are threadedly connected to the lead screw 22, and two support components 24 are respectively provided on the corresponding slide blocks 23.

[0042] It should be noted that the lead screw 22 is provided with two sets of external threads, and the two sets of external threads have the same pitch and opposite directions of rotation. The lead screw 22 can be driven by a handwheel or a motor. By driving the lead screw 22 to rotate, it is connected to the slide block 23 through the threaded engagement of the lead screw 22, thereby adjusting the distance between the two support components 24, so that it can be used to support tapered steel pipes 5 of different diameters.

[0043] This invention proposes a specific adjustment mechanism, the details of which are provided in the appendix to the specification. Figure 3 The adjustment mechanism is adjustment component 3. Adjustment component 3 includes a rotatably mounted connecting shaft 31. A support roller 32 is detachably mounted on the connecting shaft 31. The support roller 32 includes two support plates. The connecting shaft 31 has a positioning hole 311. Each of the two support plates is provided with a positioning shaft 321. The support plates are positioned on the connecting shaft 31 through the positioning shaft 321 and the positioning hole 311. A side plate 33 is mounted on the connecting shaft 31. A fastener 34 is provided on the side plate 33. The support plates are fixedly mounted on the connecting shaft 31 through the fastener 34.

[0044] It should be noted that fastener 34 is a bolt. When it is necessary to support tapered steel pipes 5 with different tapers, the bolt can be removed to disassemble the support roller 32, which consists of two support plates, and replace it with a new support roller 32 that matches the taper of the tapered steel pipe 5. The new support roller 32 can then be installed and fixed. This allows the support roller 32 to be disassembled and replaced to adjust the taper of the support area and support tapered steel pipes 5 with different tapers.

[0045] In the above technical solution, although the taper of the support area can be adjusted by replacing the support roller 32 through disassembly and replacement, when welding large-diameter thick-walled steel pipes, the support roller 32 needs to have a considerable weight to ensure stable support. However, replacing the support roller 32 often requires excessive manual operation, resulting in high labor intensity. Furthermore, due to the weight of the support roller 32, it is easy to cause safety accidents during manual operation. Therefore, this invention also proposes a specific structure for the adjustment mechanism, as detailed in the appendix to the specification. Figure 4 The adjustment mechanism is adjustment component 2 4, which includes support roller 2 41. Support roller 2 41 includes multiple support plates 2. Fasteners 2 42 are provided on the connecting shaft 31. Multiple support plates 2 are fixedly installed on the connecting shaft 31 by fasteners 2 42. The outer wall taper of multiple support plates 2 is different. A power component 43 is installed on the slide 23. The output end of the power component 43 is fixedly connected to the connecting shaft 31.

[0046] It should be noted that the fastener 42 is a bolt and the power component 43 is a motor. The support roller 41, which is composed of multiple support plates with different outer walls, is driven by the motor to rotate when it is necessary to support the tapered steel pipe 5 with different tapers. This causes the support area of ​​the support plate 41 with the corresponding taper to correspond to the tapered steel pipe 5 and provide stable support for the tapered steel pipe 5.

[0047] In the above technical solution, since the tapered steel pipe 5 is a large-diameter, thick-walled structure, it is usually placed using hoisting equipment. Therefore, when placing the tapered steel pipe 5, it is difficult to ensure that the two tapered steel pipes 5 are placed exactly in the predetermined position. The predetermined position is when the two tapered steel pipes 5 are placed together, and welding can be performed after the joint placement is completed. To this end, the present invention also proposes a positioning mechanism 6, which is used to push the tapered steel pipe 5 after the tapered steel pipe 5 is placed, so that the tapered steel pipe 5 is in the predetermined position before welding.

[0048] Further, please refer to the appendix to the instruction manual. Figure 5The frame 1 is equipped with a positioning mechanism 6, which includes a drive component 61. The output end of the drive component 61 is equipped with a threaded shaft 62. A push plate 63 is slidably arranged on the frame 1. The push plate 63 is threadedly connected to the threaded shaft 62. A guide rail 64 is provided on the frame 1. The push plate 63 is slidably arranged on the guide rail 64. The push plate 63 is used to push the tapered steel pipe 5 to move.

[0049] It should be noted that there are two sets of positioning mechanisms 6. The two sets of positioning mechanisms 6 are used to push and move a tapered steel pipe 5. The driving component 61 is a motor. The motor drives the threaded shaft 62 to rotate, so that it is connected to the threaded shaft 62 through the push plate 63. This allows the push plate 63 to slide on the frame 1 and push the tapered steel pipe 5 to move.

[0050] However, in the above technical solution, when butt-welding two tapered steel pipes 5, in order to improve the weld quality, a certain gap is usually required between the two tapered steel pipes 5. This gap helps the weld pool flow better, ensuring uniform distribution of the weld metal, thereby improving the density and strength of the weld and reducing defects (such as porosity and inclusions). Furthermore, during the welding process, the tapered steel pipes 5 expand due to heating; the gap allows for better adaptation to stresses caused by temperature changes, reducing post-weld deformation and stress concentration. Additionally, an appropriate gap allows the welding material to better fill the joint, forming a better weld joint and improving the connection strength. Normally, when welding cylindrical steel pipes, due to the cylindrical shape of the steel pipe… Since the surface is horizontal, during welding, it is only necessary to maintain a certain gap between the two cylindrical steel pipes to ensure the welding quality. However, since the surface of the support component 24 that supports the tapered steel pipe 5 has a taper that matches the tapered steel pipe 5, and since the tapered steel pipe 5 has a large diameter and thick wall, its weight is relatively large. After the tapered steel pipe 5 is moved to the predetermined position, it is easy for the tapered steel pipe 5 to slip, causing the gap between the two tapered steel pipes 5 to become smaller, or even causing the two tapered steel pipes 5 to stick together without any gap. To address this, the present invention also proposes a gap separation mechanism 7, which sets a partition 73 between the two tapered steel pipes 5 to ensure the gap between the two tapered steel pipes 5.

[0051] For details, please refer to the instruction manual appendix. Figure 7 A gap separation mechanism 7 is provided on the frame 1. The gap separation mechanism 7 includes a fixed ring 71, which is fixedly installed on the frame 1. A second driving component 72 is installed on the fixed ring 71. A partition 73 is installed at the output end of the second driving component 72. The partition 73 is located between two tapered steel pipes 5, and both tapered steel pipes 5 are in close contact with the partition 73.

[0052] It should be noted that the gap separating mechanism 7 includes multiple sets, which are evenly arranged in the circumferential direction of the fixed ring 71. The driving component 72 is a cylinder. Before the conical steel pipe 5 is moved by the positioning mechanism 6, the cylinder drives the partition 73 to move, moving the partition 73 between the two conical steel pipes 5. After the conical steel pipe 5 is moved to the predetermined position, the partition 73 is located between the two conical steel pipes 5, and the thickness of the partition 73 is equal to the gap size. This ensures that the gap is separated between the two conical steel pipes 5 before welding, thus ensuring the welding quality.

[0053] In the above technical solution, a partition 73 is set between the two tapered steel pipes 5 to create a gap between them, thus ensuring the welding quality. However, during welding, multiple points are usually welded between the two tapered steel pipes 5 first, and then the overall welding operation is performed. However, during the overall welding operation, the presence of the partition 73 can obstruct and interfere with the welding operation. Therefore, it is necessary to remove the partition 73 after the multiple points are welded. However, since the partition 73 is tightly attached between the two tapered steel pipes 5, removing the partition 73 can easily cause wear at the ends of the tapered steel pipes 5 due to the friction between the partition 73 and the tapered steel pipes 5. Furthermore, the present invention addresses the problem that wear debris can easily fall onto the welding position, affecting the welding quality. To resolve this, the present invention configures the partition 73 as two synchronously moving oppositely moving abutments 731. The two abutments 731 are respectively in close contact with the corresponding tapered steel pipes 5. Before welding, the synchronously moving oppositely moving two abutments 731 separates the two abutments 731 from the corresponding tapered steel pipes 5, and then moves the two abutments 731 out of the welding trajectory. This avoids the problem of wear on the ends of the tapered steel pipes 5 due to contact friction when removing the partition 73. The present invention also proposes a driving mechanism 8 for driving the synchronously moving oppositely moving two abutments 731.

[0054] For details, please refer to the instruction manual appendix. Figure 8 and Figure 9 The welding device also includes a drive mechanism 8, which includes a fixed base 81. The fixed base 81 is installed at the output end of the drive component 72, and both abutments 731 are slidably disposed in the fixed base 81. A drive shaft 82 is installed on the fixed base 81, and an elliptical wheel 83 is fixedly disposed on the drive shaft 82. The drive shaft 82 is used to drive the elliptical wheel 83 to rotate. The elliptical wheel 83 is in movable contact with the two abutments 731, and an elastic element 84 is disposed between the two abutments 731.

[0055] It should be noted that the drive shaft 82 can be driven by a motor, and the elastic element 84 is a spring. Figure 8In the middle, the spring is in a stretched state. The motor drives the drive shaft 82 to rotate, which in turn drives the elliptical wheel 83 to rotate. This causes the elliptical wheel 83 to separate from the two abutment plates 731, and the spring gradually recovers. This allows the two abutment plates 731 to separate from the corresponding tapered steel pipes 5. Then, the drive component 72 can drive the two abutment plates 731 away from the tapered steel pipes 5.

[0056] Further, please refer to the appendix to the instruction manual. Figure 10 The welding mechanism 9 includes a drive component 91, which is mounted on a fixed ring 71. A gear 92 is mounted on the output end of the drive component 91. A gear ring 93 is rotatably mounted on the fixed ring 71. The gear 92 meshes with the gear ring 93. A connecting plate 94 is fixedly mounted on the gear ring 93. A welding torch 95 is mounted on the connecting plate 94. The welding end of the welding torch 95 points to the welding trajectory between the two tapered steel pipes 5.

[0057] It should be noted that the driving component 91 is a motor. The motor drives the gear 92 to rotate, which in turn drives the gear ring 93 to rotate. The rotation of the gear ring 93 drives the welding torch 95 to make a circular motion and weld the two tapered steel pipes 5 together.

[0058] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A welding device for large-diameter thick-walled steel pipes used in inverted siphon construction, characterized in that, include: The frame (1) is provided with two sets of support mechanisms (2), which are used to position and support the tapered steel pipe (5); The support mechanism (2) includes two support components (24) that can move synchronously in opposite directions. The tapered steel pipe (5) is supported by the two support components (24), and the contact position between the support component (24) and the tapered steel pipe (5) is the support area. The support area has the same taper as the outer wall of the tapered steel pipe (5), so that the tapered steel pipe (5) can be in a horizontal state. The support assembly (24) is also provided with an adjustment mechanism, which is used to adjust the taper of the support area to support tapered steel pipes (5) with different tapers. The frame (1) is provided with a gap separation mechanism (7), the gap separation mechanism (7) includes a fixing ring (71), the fixing ring (71) is fixedly installed on the frame (1), the fixing ring (71) is provided with a driving component (72), the output end of the driving component (72) is provided with a partition (73), the partition (73) is located between two tapered steel pipes (5), and both tapered steel pipes (5) are in close contact with the partition (73); The partition (73) includes two abutments (731) that can move synchronously in opposite directions. The two abutments (731) are respectively in close contact with the corresponding conical steel pipe (5). Through the synchronous and opposite movement of the two abutments (731), the two abutments (731) are separated from the corresponding conical steel pipe (5), and then the two abutments (731) are driven to move out of the welding trajectory. The welding device also includes a drive mechanism (8), which includes a fixed seat (81). The fixed seat (81) is installed at the output end of the second drive component (72), and the two abutments (731) are slidably disposed in the fixed seat (81). A drive shaft (82) is installed on the fixed seat (81), and an elliptical wheel (83) is fixedly disposed on the drive shaft (82). The drive shaft (82) is used to drive the elliptical wheel (83) to rotate. The elliptical wheel (83) is in active contact with the two abutments (731), and an elastic element (84) is disposed between the two abutments (731). The frame (1) is also provided with a welding mechanism (9), which includes a welding torch (95) that can move along the welding trajectory. The welding torch (95) is used to weld two tapered steel pipes (5) along the welding trajectory. The welding mechanism (9) includes a driving component three (91), which is mounted on a fixed ring (71). A gear (92) is mounted on the output end of the driving component three (91). A toothed ring (93) is rotatably mounted on the fixed ring (71). The gear (92) meshes with the toothed ring (93). A connecting plate (94) is fixedly mounted on the toothed ring (93). The welding torch (95) is mounted on the connecting plate (94). The welding end of the welding torch (95) points to the welding trajectory between the two tapered steel pipes (5).

2. The welding device for large-diameter thick-walled steel pipes used in inverted siphon construction according to claim 1, characterized in that: The support mechanism (2) also includes a base (21), on which a lead screw (22) is provided. Two slide blocks (23) are slidably provided on the base (21). Both slide blocks (23) are threadedly connected to the lead screw (22). Two support components (24) are respectively provided on the corresponding slide blocks (23).

3. The welding device for large-diameter thick-walled steel pipes used in inverted siphon construction according to claim 2, characterized in that: The adjustment mechanism is an adjustment component (3), which includes a rotatably mounted connecting shaft (31) and a support roller (32) detachably mounted on the connecting shaft (31).

4. The welding device for large-diameter thick-walled steel pipes used in inverted siphon construction according to claim 3, characterized in that: The support roller (32) includes two support plates. The connecting shaft (31) has a positioning hole (311). Both support plates are provided with positioning shafts (321). The support plates are positioned on the connecting shaft (31) through the positioning shafts (321) and the positioning holes (311). A side plate (33) is installed on the connecting shaft (31). A fastener (34) is provided on the side plate (33). The support plates are fixedly installed on the connecting shaft (31) through the fastener (34).

5. The welding device for large-diameter thick-walled steel pipes used in inverted siphon construction according to claim 2, characterized in that: The adjustment mechanism is adjustment component two (4), which includes a connecting shaft (31) and a support roller two (41). The support roller two (41) includes multiple support plates two. Fastener two (42) is provided on the connecting shaft (31). Multiple support plates two are fixedly installed on the connecting shaft (31) by fastener two (42), and the outer wall taper of multiple support plates two is different. A power component (43) is installed on the slide (23), and the output end of the power component (43) is fixedly connected to the connecting shaft (31).

6. The welding device for large-diameter thick-walled steel pipes used in inverted siphon construction according to claim 5, characterized in that: The frame (1) is provided with a positioning mechanism (6), which includes a drive component (61). The output end of the drive component (61) is equipped with a threaded shaft (62). A push plate (63) is slidably provided on the frame (1). The push plate (63) is threadedly connected to the threaded shaft (62). A guide rail (64) is provided on the frame (1). The push plate (63) is slidably provided on the guide rail (64). The push plate (63) is used to push the tapered steel pipe (5) to move.

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