Welding device for repairing nodular cast iron pipeline

Abstract

The invention discloses a welding device for repairing a nodular cast iron pipeline, and belongs to the technical field of pipeline welding repairing. The welding device for repairing the nodular cast iron pipeline comprises a supporting mechanism and a metal patch used for repairing a hole in a pipeline body, and the supporting mechanism is in threaded connection with an abutting fixing mechanism used for abutting against the metal patch; a rotary driving mechanism is further mounted in the center of the top of the supporting mechanism; a distance adjusting mechanism is fixedly mounted at the bottom of the rotary driving mechanism, and an automatic welding mechanism is slidably mounted at the other end of the distance adjusting mechanism. And one side of the automatic welding mechanism is fixedly connected with a height adjusting mechanism. By designing the rotary driving mechanism, the distance adjusting mechanism, the automatic welding mechanism and the height adjusting mechanism, the height of the lifting support can be adjusted along with the height change of the metal patch, so that the height of the automatic welding mechanism can be automatically adjusted as a whole, and a welding gun can complete high-quality all-directional welding.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline welding repair, and in particular relates to a welding device for repairing a ductile iron pipeline. Background Art

[0002] Ductile iron pipe is a pipe made of ductile iron (also known as spheroidal graphite cast iron). Compared with traditional gray cast iron pipes, ductile iron pipes have higher strength, toughness and corrosion resistance, as well as better impact resistance and crack resistance. This pipe can withstand higher internal pressure and is suitable for high-pressure water delivery systems. Due to its many excellent properties, ductile iron pipes are currently widely used in urban water supply systems, sewage treatment systems and various industrial pipeline systems.

[0003] The superior performance of ductile iron pipes makes them an important part of modern pipeline systems. Ductile iron pipes are generally buried underground. When construction equipment is used on the ground for excavation and construction, ductile iron pipes are often damaged. Once the pipes are broken or ruptured, they need to be repaired immediately. The half joint is the most widely used equipment in the repair of ductile iron pipes. Although it can achieve the function of sealing and repairing pipes, there are certain problems in actual use. When the pipe is damaged by external force and a large rupture hole is formed, due to the high pressure at the rupture hole, when the half joint is used alone for plugging and repairing, the connection between the half joint and the pipe is prone to leakage. In order to avoid this situation, it is usually necessary to weld a patch at the hole first. At present, the welding of the patch is usually performed manually. During the welding process, it is often limited by the angle and position of the hole. Generally, two or even more people are required to assist. Not only is the operation difficult and inefficient, but the welding quality cannot be guaranteed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a welding device for repairing ductile iron pipes.

[0005] The technical solution adopted to solve the above technical problems is: a welding device for repairing ductile iron pipes, comprising a supporting mechanism and a metal patch for repairing a hole on a pipe body, the supporting mechanism comprising a main supporting frame, the top center of the main supporting frame is fixedly connected to a fixing frame, the front and rear ends of the bottom of both sides of the supporting mechanism are fixed with connecting components by screws, and the other end of the connecting component is welded and fixed to the pipe body. After the supporting mechanism is pre-fixed to the pipe body by magnetic attraction, the other end of the connecting component can be welded and fixed to the pipe body by welding, at which time the entire supporting mechanism can be stably fixed to the pipe body, so as to provide stable supporting conditions for subsequent welding, and at the same time, the stability of the welding process can be guaranteed, thereby ensuring the welding quality; when the welding of the entire metal patch is completed, the screws between the connecting component and the supporting mechanism can be directly removed, and the entire welding device can be removed from the pipe body, and multiple connecting components can be left on the pipe body, or they can be cut by equipment such as an angle grinder; The support mechanism is threadedly connected with a tightening and fixing mechanism for tightening the metal patch, and a rotation driving mechanism is also installed at the center of the top of the support mechanism; A distance adjustment mechanism is fixedly installed at the bottom of the rotary drive mechanism, and an automatic welding mechanism is slidably installed at the other end of the distance adjustment mechanism; One side of the automatic welding mechanism is fixedly connected with a height adjustment mechanism.

[0006] Furthermore, magnetic strips are fixedly installed at the bottom of both sides of the main support frame, and the magnetic strips can be adsorbed and fixed on the pipeline body.

[0007] Through the above technical solution, the pre-positioning of the entire support mechanism can be achieved. No matter where the hole is located on the pipe wall, the support mechanism can be quickly installed and fixed for subsequent welding operations.

[0008] Furthermore, the tightening and fixing mechanism includes a threaded rod threadedly connected to the middle part of the fixing frame, the threads on the threaded rod are distributed in the upper and middle parts, and the lower and middle parts are a bare rod structure. The bottom center of the threaded rod is fixedly connected to a spherical top rod, and the tops on both sides of the threaded rod are fixedly connected to fixed handles.

[0009] By means of the above technical scheme, when the support mechanism is fixed, the metal patch for repair can be attached to the pipe body and completely cover the hole, and then the fixing handle is rotated to make the threaded rod and the spherical push rod slowly approach the metal patch. When the spherical push rod is about to contact the metal patch, the position of the metal patch is appropriately adjusted so that the spherical push rod can be aligned with the positioning groove on the metal patch, and then continue to screw in, so as to use the spherical push rod to press the metal patch tightly, and then make the metal patch fit tightly with the outer surface of the pipe body to ensure that no shaking occurs during the subsequent welding process; further, by arranging a spherical push rod at the end of the threaded rod and grinding a matching positioning groove on the metal patch, the spherical push rod can be used to complete the rapid pressing and fixing of the metal patch, and at the same time, the accuracy of positioning and the stability during the locking process can be ensured.

[0010] Furthermore, the rotary drive mechanism includes a fixed bracket fixed to the bottom of the fixed frame, a bearing is installed at the bottom of the fixed bracket, an outer gear ring is fixedly installed on the outer ring of the bearing, a drive motor is also installed on the fixed bracket, and a drive gear meshing with the outer gear ring is fixedly installed at the bottom end of the output shaft of the drive motor.

[0011] Through the above technical solution, the rotary drive mechanism can drive the automatic welding mechanism to rotate 360 ​​degrees, so that the automatic welding mechanism can perform 360-degree automatic welding around the metal patch. Specifically, when the positioning of the distance adjustment mechanism and the automatic welding mechanism is completed, the drive motor can be started. When the drive motor is working, it can drive the drive gear to rotate synchronously through its output shaft, and then drive the outer gear ring meshing with it to rotate, and then drive the distance adjustment mechanism and the automatic welding mechanism fixed to the outer gear ring to perform 360-degree rotation.

[0012] Furthermore, the distance adjustment mechanism includes a connecting column fixed to one side of the bottom of the outer gear ring, the bottom of the connecting column is fixedly connected to a fixing seat, the outer side of the fixing seat is sleeved with a mounting seat, the mounting seat is threadedly connected to a first locking knob corresponding to the fixed seat, one side of the mounting seat is fixedly connected to a fixing rod, the center of the fixing rod is slidably connected to a telescopic rod, and the fixed rod is threadedly connected to a second locking knob corresponding to the telescopic rod.

[0013] Through the above technical scheme, the distance adjustment mechanism is mainly used to adjust the welding radius of the automatic welding mechanism. Since the size of the hole cannot be determined, before welding, it is necessary to select a metal patch of appropriate size according to the actual size of the hole, and then adjust the rotation radius of the automatic welding mechanism according to the radius of the metal patch. Specifically, when the size of the metal patch is determined, the second locking knob can be loosened, and the telescopic rod can slide in the center of the fixed rod. When the welding position of the automatic welding mechanism is adjusted and fixed, the second locking knob can be used to lock and fix the position of the telescopic rod.

[0014] Furthermore, the automatic welding mechanism includes a lifting bracket, which is rotatably connected to a ball screw, a servo motor corresponding to the ball screw is installed at the top of the lifting bracket, a welding gun bracket is installed on the ball screw, a ball nut seat corresponding to the ball screw is installed at the top center of the welding gun bracket, and a welding gun is also installed at the bottom of the welding gun bracket.

[0015] Through the above technical scheme, the automatic welding mechanism is used for automatic welding of metal patches. After the position adjustment of the welding gun is completed, the ball screw can be driven by the servo motor to rotate according to the thickness of the metal patch, and then the welding gun bracket and the welding gun can be driven to reciprocate up and down, and the rotation drive of the rotary drive mechanism is cooperated, so that the welding gun can perform fish scale welding around the circumference of the metal patch, thereby ensuring the welding quality during the welding process.

[0016] Furthermore, a limiting slide groove is provided on the lifting bracket, and the other end of the telescopic rod passes through and is slidably limited in the limiting slide groove, and a limiting block is fixedly installed on one end of the telescopic rod close to the lifting bracket.

[0017] Through the above technical solution, the lifting bracket can slide on the telescopic rod, so that the height can be adjusted according to the position change of the metal patch.

[0018] Furthermore, the height adjustment mechanism includes a height adjustment bracket fixed on the lifting bracket, the bottom of one side of the height adjustment bracket is rotatably connected to an adjustment wheel, and a counterweight block is fixedly installed on the top of the outer side of the height adjustment bracket.

[0019] Through the above technical scheme, although the metal patch is circular in top view, it is in contact with the outer surface of the pipe body and therefore has a certain curvature. To ensure that welding can be performed around the circumference of the metal patch, it is necessary to ensure that the lifting bracket of the automatic welding mechanism can change with the height changes of the circumference of the metal patch. By setting an adjusting wheel and under the action of the gravity of the counterweight, the adjusting wheel can always move along the top circumference of the metal patch, so that the lifting bracket can also adjust its height accordingly, so that the automatic welding mechanism can automatically adjust its height as a whole, so that the welding gun can complete high-quality all-round welding.

[0020] Furthermore, the metal patch includes a patch body, and a positioning groove is provided at the center of the top of the patch body.

[0021] Through the above technical solution, the curvature of the inner surface of the patch body is the same as the curvature of the outer surface of the pipe body, so that the patch body can be stably and tightly fitted to the outer surface of the pipe body. In addition, by opening a positioning groove at the center of the top of the patch body, it can cooperate with the tightening and fixing mechanism to quickly complete the fixing work.

[0022] Furthermore, in the working state, the bottom end of the spherical top rod is inserted into the positioning groove, and the patch body and the pipeline body are tightly attached by spiral extrusion.

[0023] The beneficial effects of the present invention are as follows: (1) By designing a support mechanism and a connecting assembly, the present invention can weld and fix the other end of the connecting assembly to the pipe body by welding, so that the entire support mechanism can be stably fixed to the pipe body, thereby providing stable support conditions for subsequent welding, and also ensuring stability during the welding process, thereby ensuring welding quality; (2) By designing a tightening and fixing mechanism and arranging a spherical push rod at the end of the threaded rod, the present invention can not only use the spherical push rod to complete the rapid tightening and fixing of the metal patch, but also ensure the positioning accuracy and stability during the locking process; (3) By designing a rotating drive mechanism, a distance adjustment mechanism, an automatic welding mechanism and a height adjustment mechanism, the present invention can not only adjust the welding radius according to the size of the metal patch, but also the lifting bracket can also adjust the height according to the height change of the metal patch, so that the automatic welding mechanism can automatically adjust the height as a whole, so that the welding gun can complete high-quality all-round automatic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a first-view structural diagram of the working state of the present invention; Figure 2 It is a second perspective structural diagram of the working state of the present invention; Figure 3 It is a front view of the working state of the present invention; Figure 4 It is a structural schematic diagram of the pipeline body of the present invention; Figure 5 It is a schematic structural diagram of the welding device of the present invention from a first viewing angle; Figure 6 is a schematic structural diagram of the welding device of the present invention from a second viewing angle; Figure 7 It is a structural schematic diagram of the rotary drive mechanism of the present invention; Figure 8 It is a schematic diagram of the installation structure of the automatic welding mechanism of the present invention; Fig. 9 It is a structural schematic diagram of the automatic welding mechanism of the present invention; Fig.10 It is a structural schematic diagram of the height adjustment mechanism of the present invention; Fig.11 yes Fig.10 A partial enlarged view of the middle A; Fig.12 It is a structural schematic diagram of the distance adjustment mechanism of the present invention.

[0025] Figure numerals: 1, support mechanism; 101, main support frame; 102, fixing frame; 103, magnetic strip; 2, connecting assembly; 3, tightening fixing mechanism; 301, threaded rod; 302, spherical top rod; 303, fixing handle; 4, rotating drive mechanism; 401, fixing bracket; 402, bearing; 403, outer gear ring; 404, driving motor; 405, driving gear; 5, distance adjustment mechanism; 501, connecting column; 502, fixing seat; 503, mounting seat; 504, first locking rotary Button; 505, fixing rod; 506, telescopic rod; 507, second locking knob; 508, limit block; 6, automatic welding mechanism; 601, lifting bracket; 602, ball screw; 603, servo motor; 604, welding gun bracket; 605, welding gun; 606, limit slide; 7, height adjustment mechanism; 701, height adjustment bracket; 702, adjusting wheel; 703, counterweight; 8, metal patch; 801, patch body; 802, positioning groove; 9, pipe body; 10, hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with 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 intended to limit the present invention.

[0027] like Figure 1-Figure 12As shown, a welding device for repairing a ductile iron pipe in this embodiment includes a support mechanism 1 and a metal patch 8 for repairing a hole 10 on a pipe body 9. The support mechanism 1 includes a main support frame 101. A fixing frame 102 is fixedly connected to the top center of the main support frame 101. Magnetic strips 103 are fixedly installed at the bottoms of both sides of the main support frame 101. The magnetic strips 103 can be adsorbed and fixed on the pipe body 9, thereby realizing pre-positioning of the entire support mechanism 1. No matter where the hole 10 is located on the pipe wall, the support mechanism 1 can be quickly installed and fixed for subsequent welding operations.

[0028] For connection components 2, refer to Figure 1-Figure 6 The front and rear ends of the bottom of both sides of the support mechanism 1 are fixed to the connecting component 2 by screws, and the other end of the connecting component 2 is welded and fixed to the pipe body 9. After the support mechanism 1 is pre-fixed to the pipe body 9 by magnetic attraction, the other end of the connecting component 2 can be welded and fixed to the pipe body 9 by welding. At this time, the entire support mechanism 1 can be stably fixed to the pipe body 9, so as to provide stable supporting conditions for subsequent welding, and at the same time, it can also ensure the stability of the welding process, thereby ensuring the welding quality.

[0029] Further, in this embodiment, after the entire metal patch 8 is welded, the screws between the connection assembly 2 and the support mechanism 1 can be directly removed, and the entire welding device can be removed from the pipe body 9. The plurality of connection assemblies 2 can be left on the pipe body 9, or can be cut using an angle grinder or other equipment; Regarding the abutting and fixing mechanism 3, the abutting and fixing mechanism 3 is used to abut the metal patch 8; Figure 5-Figure 8 The tightening and fixing mechanism 3 includes a threaded rod 301 threadedly connected to the middle part of the fixing frame 102, the threads on the threaded rod 301 are distributed in the middle and upper part, and the middle and lower part is a bare rod structure. The bottom center of the threaded rod 301 is fixedly connected to a spherical top rod 302, and the tops of both sides of the threaded rod 301 are fixedly connected to fixing handles 303. When the support mechanism 1 is fixed, the metal patch 8 for repair can be attached to the pipe body 9 and completely cover the hole 10, and then the fixing handle 303 is rotated to make the threaded rod 301 and the spherical top rod 302 slowly approach the metal patch 8. When the spherical top rod 302 is about to contact the metal patch 8, the position of the metal patch 8 is appropriately adjusted so that the spherical top rod 302 can be just aligned with the positioning groove 802 on the metal patch 8, and then continue to screw in, so as to use the spherical top rod 302 to tighten the metal patch 8, and then the metal patch 8 can be tightly fitted with the outer surface of the pipe body 9 to ensure that no shaking occurs during the subsequent welding process.

[0030] This embodiment further provides a spherical top rod 302 at the end of the threaded rod 301 and grinds a matching positioning groove 802 on the metal patch 8, so that the spherical top rod 302 can be used to quickly tighten and fix the metal patch 8, while also ensuring the accuracy of positioning and stability during the locking process.

[0031] Regarding the rotary drive mechanism 4, the rotary drive mechanism 4 can drive the automatic welding mechanism 6 to rotate 360 ​​degrees, so that the automatic welding mechanism 6 can perform 360-degree automatic welding around the metal patch 8; Figure 7-Figure 12 The rotating drive mechanism 4 includes a fixed bracket 401 fixed to the bottom of the fixed frame 102, a bearing 402 is installed at the bottom of the fixed bracket 401, an outer gear ring 403 is fixedly installed on the outer ring of the bearing 402, and a driving motor 404 is also installed on the fixed bracket 401. A driving gear 405 meshing with the outer gear ring 403 is fixedly installed at the bottom end of the output shaft of the driving motor 404. Specifically, when the positioning of the distance adjustment mechanism 5 and the automatic welding mechanism 6 is completed, the driving motor 404 can be started. When the driving motor 404 is working, it can drive the driving gear 405 to rotate synchronously through its output shaft, and then drive the outer gear ring 403 meshing therewith to rotate, and then drive the distance adjustment mechanism 5 and the automatic welding mechanism 6 fixed to the outer gear ring 403 to perform a 360-degree rotation movement.

[0032] Regarding the distance adjustment mechanism 5, the distance adjustment mechanism 5 is mainly used for adjusting the welding radius of the automatic welding mechanism 6; Figure 9-12 The distance adjustment mechanism 5 includes a connecting column 501 fixed to one side of the bottom of the outer gear ring 403, a fixing seat 502 is fixedly connected to the bottom of the connecting column 501, a mounting seat 503 is sleeved on the outer side of the fixing seat 502, a first locking knob 504 corresponding to the fixing seat 502 is threadedly connected to the mounting seat 503, a fixing rod 505 is fixedly connected to one side of the mounting seat 503, a telescopic rod 506 is slidably connected to the center of the fixing rod 505, and a second locking knob 507 corresponding to the telescopic rod 506 is threadedly connected to the fixing rod 505. Since the size of the hole 10 cannot be determined, before welding, it is necessary to select a metal patch 8 of an appropriate size according to the actual size of the hole 10, and then adjust the rotation radius of the automatic welding mechanism 6 according to the radius of the metal patch 8. Specifically, when the size of the metal patch 8 is determined, the second locking knob 507 can be loosened, and the telescopic rod 506 can slide in the center of the fixed rod 505. When the welding position of the automatic welding mechanism 6 is adjusted and fixed, the second locking knob 507 can be used to lock and fix the position of the telescopic rod 506.

[0033] Regarding the automatic welding mechanism 6, the automatic welding mechanism 6 is used for automatic welding of the metal patch 8; Figure 9-11The automatic welding mechanism 6 includes a lifting bracket 601, on which a ball screw 602 is rotatably connected, a servo motor 603 corresponding to the ball screw 602 is installed at the top of the lifting bracket 601, a welding gun bracket 604 is installed on the ball screw 602, a ball nut seat corresponding to the ball screw 602 is installed at the top center of the welding gun bracket 604, and a welding gun 605 is also installed at the bottom of the welding gun bracket 604. When the position of the welding gun 605 is adjusted, the ball screw 602 can be driven to rotate by the servo motor 603 according to the thickness of the metal patch 8, thereby driving the welding gun bracket 604 and the welding gun 605 to reciprocate up and down, and cooperating with the rotation drive of the rotation drive mechanism 4, the welding gun 605 can perform fish scale welding around the circumference of the metal patch 8, thereby ensuring the welding quality during the welding process.

[0034] Furthermore, in this embodiment, a limiting slot 606 is provided on the lifting bracket 601, and the other end of the telescopic rod 506 passes through and is slidably limited in the limiting slot 606. A limiting block 508 is also fixedly installed on the end of the telescopic rod 506 close to the lifting bracket 601, so that the lifting bracket 601 can slide on the telescopic rod 506, so that the height can be adjusted according to the position change of the metal patch 8.

[0035] Regarding the height adjustment mechanism 7, refer to Figure 9-10 The height adjustment mechanism 7 includes a height adjustment bracket 701 fixed on the lifting bracket 601, and the bottom of one side of the height adjustment bracket 701 is rotatably connected to an adjusting wheel 702, and a counterweight block 703 is also fixedly installed on the top of the outer side of the height adjustment bracket 701. Although the top-view angle of the metal patch 8 is circular, since it fits the outer surface of the pipe body 9, it also has a certain curvature. In order to ensure that welding can be carried out around the circumference of the metal patch 8, it is necessary to ensure that the lifting bracket 601 of the automatic welding mechanism 6 can change with the height change of the circumference of the metal patch 8. By setting the adjusting wheel 702 and under the action of the gravity of the counterweight block 703, the adjusting wheel 702 can always move along the top circumference of the metal patch 8, so that the lifting bracket 601 can also follow it for height adjustment, so that the automatic welding mechanism 6 can automatically adjust the height as a whole, so that the welding gun 605 can complete high-quality all-round welding.

[0036] For metal patch 8, refer to Figure 1-Figure 6The metal patch 8 includes a patch body 801, and a positioning groove 802 is opened at the top center of the patch body 801. The curvature of the inner surface of the patch body 801 is the same as the curvature of the outer surface of the pipe body 9, so that the patch body 801 can be stably and tightly fitted with the outer surface of the pipe body 9. In addition, by opening the positioning groove 802 at the top center of the patch body 801, it can cooperate with the tightening fixing mechanism 3 to quickly complete the fixing work.

[0037] In the working state, the bottom end of the spherical top rod 302 is inserted into the positioning groove 802, and the patch body 801 is tightly attached to the pipe body 9 by means of spiral extrusion.

[0038] The working principle of this embodiment is as follows: first determine the position of the hole 10 on the pipe body 9, then use the two magnetic strips 103 on the support mechanism 1 to adsorb and fix the support mechanism 1 on the pipe body 9, thereby achieving the pre-positioning of the entire support mechanism 1, and then weld the other end of the connecting component 2 to the pipe body 9 by welding; After the support mechanism 1 is fixed, the metal patch 8 for repair can be attached to the pipe body 9 and completely cover the hole 10, and then the fixing handle 303 is rotated to slowly move the threaded rod 301 and the spherical top rod 302 toward the metal patch 8, so that the spherical top rod 302 is used to press the metal patch 8, so that the metal patch 8 can be closely attached to the outer surface of the pipe body 9; Before welding, the rotation radius of the automatic welding mechanism 6 needs to be adjusted according to the radius of the metal patch 8. After the welding position of the automatic welding mechanism 6 is adjusted and fixed, the position of the telescopic rod 506 can be locked and fixed using the second locking knob 507; When the distance adjustment mechanism 5 and the automatic welding mechanism 6 are positioned, the drive motor 404 can be started, and the outer gear ring 403 meshing with the drive gear 405 can be driven to rotate, so that the distance adjustment mechanism 5 and the automatic welding mechanism 6 fixed to the outer gear ring 403 can be driven to rotate 360 ​​degrees. During the welding process, according to the thickness of the metal patch 8, the servo motor 603 can drive the ball screw 602 to rotate, and then the welding gun bracket 604 and the welding gun 605 can be driven to reciprocate up and down, and cooperate with the rotation drive of the rotation drive mechanism 4, so that the welding gun 605 can perform fish scale welding around the circumference of the metal patch 8; In addition, the device is also provided with a height adjustment mechanism 7. The lifting bracket 601 of the automatic welding mechanism 6 can change along with the height change of the metal patch 8. By providing an adjustment wheel 702, the adjustment wheel 702 can always move along the top side of the metal patch 8, so that the lifting bracket 601 can also adjust its height accordingly, so that the automatic welding mechanism 6 can automatically adjust its height as a whole, so that the welding gun 605 can complete high-quality all-round welding. After welding is completed, the screws between the connecting assembly 2 and the supporting mechanism 1 can be directly removed.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A welding device for repairing a ductile iron pipe, comprising a support mechanism (1) and a metal patch (8) for repairing a hole (10) on a pipe body (9), characterized in that: The support mechanism (1) comprises a main support frame (101), the top center of the main support frame (101) is fixedly connected to a fixing frame (102), the front and rear ends of the bottoms of both sides of the support mechanism (1) are fixed with connecting components (2) by screws, and the other end of the connecting component (2) is welded and fixed to the pipeline body (9); The support mechanism (1) is threadedly connected with a tightening and fixing mechanism (3) for tightening the metal patch (8), and a rotation driving mechanism (4) is also installed at the top center of the support mechanism (1); A distance adjustment mechanism (5) is fixedly mounted on the bottom of the rotary drive mechanism (4), and an automatic welding mechanism (6) is slidably mounted on the other end of the distance adjustment mechanism (5); A height adjustment mechanism (7) is fixedly connected to one side of the automatic welding mechanism (6).

2. The welding device for repairing ductile iron pipes according to claim 1, characterized in that: Magnetic strips (103) are fixedly mounted on the bottoms of both sides of the main support frame (101), and the magnetic strips (103) can be adsorbed and fixed on the pipeline body (9).

3. The welding device for repairing ductile iron pipes according to claim 1, characterized in that: The tightening and fixing mechanism (3) comprises a threaded rod (301) threadedly connected to the middle part of the fixing frame (102), the threads on the threaded rod (301) are distributed in the middle and upper part, and the middle and lower part is a bare rod structure, the bottom center of the threaded rod (301) is fixedly connected to a spherical top rod (302), and the tops of both sides of the threaded rod (301) are fixedly connected to fixed handles (303).

4. The welding device for repairing ductile iron pipes according to claim 1, characterized in that: The rotary drive mechanism (4) comprises a fixed bracket (401) fixed to the bottom of the fixed frame (102); a bearing (402) is mounted on the bottom of the fixed bracket (401); an outer gear ring (403) is fixedly mounted on the outer ring of the bearing (402); a drive motor (404) is also mounted on the fixed bracket (401); a drive gear (405) meshing with the outer gear ring (403) is fixedly mounted on the bottom end of the output shaft of the drive motor (404).

5. The welding device for repairing ductile iron pipes according to claim 4, characterized in that: The distance adjustment mechanism (5) comprises a connecting column (501) fixed to one side of the bottom of the outer gear ring (403); the bottom of the connecting column (501) is fixedly connected to a fixing seat (502); the outer side of the fixing seat (502) is sleeved with a mounting seat (503); a first locking knob (504) corresponding to the fixing seat (502) is threadedly connected to the mounting seat (503); a fixing rod (505) is fixedly connected to one side of the mounting seat (503); a telescopic rod (506) is slidably connected to the center of the fixing rod (505); and a second locking knob (507) corresponding to the telescopic rod (506) is threadedly connected to the fixing rod (505).

6. The welding device for repairing ductile iron pipes according to claim 5, characterized in that: The automatic welding mechanism (6) comprises a lifting bracket (601), a ball screw (602) being rotatably connected to the lifting bracket (601), a servo motor (603) corresponding to the ball screw (602) being mounted on the top of the lifting bracket (601), a welding gun bracket (604) being mounted on the ball screw (602), a ball nut seat corresponding to the ball screw (602) being mounted at the top center of the welding gun bracket (604), and a welding gun (605) being further mounted at the bottom of the welding gun bracket (604).

7. The welding device for repairing ductile iron pipes according to claim 6, characterized in that: The lifting bracket (601) is provided with a limit slide groove (606), the other end of the telescopic rod (506) passes through and is slidably limited in the limit slide groove (606), and a limit block (508) is fixedly installed on one end of the telescopic rod (506) close to the lifting bracket (601).

8. The welding device for repairing ductile iron pipes according to claim 6, characterized in that: The height adjustment mechanism (7) comprises a height adjustment bracket (701) fixed on the lifting bracket (601), the bottom of one side of the height adjustment bracket (701) being rotatably connected to an adjustment wheel (702), and a counterweight (703) being fixedly mounted on the top of the outer side of the height adjustment bracket (701).

9. The welding device for repairing ductile iron pipes according to claim 3, characterized in that: The metal patch (8) comprises a patch body (801), and a positioning groove (802) is provided at the centre of the top of the patch body (801).

10. The welding device for repairing ductile iron pipes according to claim 9, characterized in that: In the working state, the bottom end of the spherical top rod (302) is inserted into the positioning groove (802), and the patch body (801) and the pipe body (9) are tightly attached to each other by means of spiral extrusion.

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