Auxiliary steel pipe welding device

Abstract

The utility model discloses an auxiliary steel pipe welding device which mainly comprises a base, a fixing rope and a fixing block, a steel pipe is placed in a semi-circular groove of the base and is fixed through the fixing rope, so that the position of the steel pipe is stable, the welding effect of the steel pipe is good, and meanwhile, the fixing block is fixed through the fixing rope. And the two ends of the fixing rope are detachably connected with the second lug block and the fixing block correspondingly, so that the fixing rope cannot be damaged when detached, the device can be repeatedly used, and the construction cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pipeline welding, especially to an auxiliary steel pipe welding device. BACKGROUND

[0002] When welding a large-diameter pipeline, the pipeline needs to be hoisted, and then butt-jointed with the previously installed pipeline, so that the two pipelines are aligned and then welded.

[0003] In the prior art, when welding a pipeline, a sling is usually arranged on the circumferential outer wall of the pipeline, and then the pipeline is hoisted to a designated position by connecting the sling with a crane, and then the sling is connected with a hanger, so that the pipeline is kept in a suspended state, and the circumferential outer wall of the pipeline can be welded. In order to stabilize the pipeline and ensure the welding precision, a supporting device is arranged on the lower side of the pipeline to assist the welding of the steel pipe.

[0004] In the prior art, the supporting device usually includes a horizontal strip block arranged on the lower side of the pipeline, and then a steel rope or a steel bar is wound around the circumferential outer wall of the pipeline, and the two ends of the steel rope or steel bar are welded to the horizontal strip block, so as to fix the pipeline. However, in actual use, this method still needs to be improved in some aspects:

[0005] 1. The disassembly of the steel rope or steel bar takes time, and after disassembly, they are damaged and cannot be reused, further increasing the cost. In addition, the installation needs to be completed by welding, which is difficult to operate and time-consuming, and is not convenient to use.

[0006] Therefore, there is an urgent need for an auxiliary steel pipe welding device to support the pipeline without causing damage during disassembly, which can be reused to reduce costs. INVENTION CONTENTS

[0007] The utility model aims at providing an auxiliary steel pipe welding device to solve the technical problem that the supporting device of the steel pipe is damaged during disassembly and cannot be reused.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0009] An auxiliary steel pipe welding device includes a base, a fixing rope and a fixing block. The base is provided with a semicircular groove, and the two side walls of the base are provided with a first ear block and a second ear block. The first ear block and the second ear block are arranged on the two sides of the semicircular groove in the axial direction. The first ear block is provided with a vertical through hole, and the fixing block is arranged on the vertical lower side of the first ear block. The fixing rope passes through the fixing block, the first ear block and the second ear block in sequence, and the two ends are detachably connected with the first ear block and the second ear plate respectively. When the steel pipe is placed in the semicircular groove, the part of the fixing rope body abuts against and is in contact with the circumferential outer wall of the steel pipe.

[0010] In some embodiments, the first ear block is bent downwards at an end away from the base, and a jam bolt is arranged towards the side wall of the base, a through hole is in the same plane as the axial direction of the jam bolt, and the fixing rope passes through the through hole.

[0011] In some embodiments, the first ear block is perpendicular to the block body at an end away from the base plate, and the axial direction of the jam bolt is perpendicular to the axial direction of the through hole.

[0012] In some embodiments, one end of the fixing rope is provided with a second connecting rod, the lower end of the second connecting rod is provided with a first limiting plate, the side wall of the fixing block is provided with a first groove, and when the second connecting rod is arranged in the first groove, the upper side wall of the first limiting plate abuts and fits with the lower side wall of the fixing plate.

[0013] In some embodiments, a first bolt is further included, the second connecting rod is provided with a first connecting hole, the opposite side walls of the first groove are each provided with a first bolt hole, and when the second connecting rod is arranged in the first groove, the first bolt passes through the two first bolt holes and the first connecting hole.

[0014] In some embodiments, the first groove is arranged on the vertical lower side of the through hole.

[0015] In some embodiments, the second ear block is provided with a second groove, the other end of the fixing rope is provided with a second connecting rod, the lower end of the second connecting rod is provided with a second limiting plate, and when the second connecting rod is arranged in the second groove, the upper side wall of the second limiting plate abuts and fits with the lower side wall of the second ear plate.

[0016] In some embodiments, a second bolt is further included, the second connecting rod is provided with a second connecting hole, the opposite side walls of the second groove are each provided with a second bolt hole, and when the second connecting rod is arranged in the second groove, the second bolt passes through the two second bolt holes and the second connecting hole.

[0017] In some embodiments, a plurality of arc-shaped plates are further included, the outer walls of the plurality of arc-shaped plates are each matched with the semicircular groove, the inner walls of the plurality of arc-shaped plates are each provided with a circular arc of different sizes, and the plurality of arc-shaped plates are each detachably connected with the semicircular groove.

[0018] In some embodiments, a center line of the inner wall of the semicircular groove is provided with a plurality of assembly holes, and a center line of the outer wall of the assembly plate is provided with a plurality of assembly blocks, and the plurality of assembly blocks are each matched with the plurality of assembly holes.

[0019] In some embodiments, the plurality of assembly holes are sequentially and spacedly arranged along the axial direction of the semicircular groove.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] The utility model discloses, through the semicircular groove of base places the steel pipe, and through fixed rope is fixed with steel pipe to make steel pipe position stable, and then make steel pipe welding effect is better, simultaneously, fixed rope both ends are detachably connected with second ear block and fixed block to make fixed rope not be damaged when dismounting, and then make the device can be repeatedly used, reduce construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be needed to use the drawing in the embodiment briefly introduced, should understand, the following drawing only shows some embodiment of the utility model, therefore should not be regarded as the limitation of range, for the ordinary skill in the art person, under the premise of not paying creative labor, can also obtain other related drawings according to these drawings.

[0023] Figure 1 It is the front view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application;

[0024] Figure 2 It is the top view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application;

[0025] Figure 3 It is the front view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application when not installing fixed rope and steel pipe;

[0026] Figure 4 It is the top view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application when not installing fixed rope and steel pipe;

[0027] Figure 5 It is the left view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application;

[0028] Figure 6 It is the right view schematic drawing of auxiliary steel pipe welding device of the embodiment of the application;

[0029] Figure 7 It is the top view schematic drawing of fixed block of auxiliary steel pipe welding device of the embodiment of the application;

[0030] Figure 8 It is the schematic drawing of auxiliary steel pipe welding device of the embodiment of the application jackscrew;

[0031] Figure 9 It is the schematic drawing of first connecting rod and second connecting rod of auxiliary steel pipe welding device of the embodiment of the application;

[0032] Figure 10 It is the front view schematic drawing of arc plate of auxiliary steel pipe welding device of the embodiment of the application;

[0033] Figure 11It is a top view schematic diagram of the arc-shaped plate of the auxiliary steel pipe welding device of the embodiment of the present application.

[0034] Figure 12 It is a top view schematic diagram of the arc-shaped plate of the auxiliary steel pipe welding device of the embodiment of the present application. Figure 1 It is an enlarged schematic diagram of the mark A.

[0035] Reference signs:

[0036] 1-base, 11-semicircular groove, 12-first lug, 121-through hole, 13-second lug, 131-second groove, 132-second bolt hole, 14-assembly hole,

[0037] 2-fixing rope,

[0038] 3-fixing block, 31-first groove, 32-first bolt hole,

[0039] 4-steel pipe,

[0040] 5-tightening bolt, 51-rotating head, 511-rope groove,

[0041] 6-first connecting rod, 61-first connecting hole,

[0042] 7-first limiting plate,

[0043] 8-first bolt,

[0044] 9-second connecting rod, 91-second connecting hole,

[0045] 10-second limiting plate,

[0046] 20-second bolt,

[0047] 30-arc-shaped plate, 301-assembly block. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0049] It should be noted that: similar reference signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0050] In the description of the utility model, it needs to be explained that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, it is only for the convenience of describing the utility model and simplifying the description, and it does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0051] In addition, if the terms "first", "second", "third" and the like are used only to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0052] In addition, if the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0053] In the description of the utility model, it also needs to be explained that, unless otherwise specified and limited, if the terms "set", "install", "connect", "connect" and the like are broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0054] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0055] It should be understood that in the welding process of the steel pipe, the steel rope or steel bar for fixing the steel pipe on the supporting device is connected with the horizontal block at the bottom of the supporting device through welding, so that the disassembly of the steel rope or steel bar consumes time, and after disassembly, they will be damaged and cannot be reused, further increasing the cost, and the installation needs to be completed through welding, which is difficult to operate, consumes time and is not convenient to use.

[0056] In order to improve the above problems, the embodiment provides an auxiliary steel pipe welding device, mainly including a base, a fixing rope and a fixing block. The device is mainly used for fixing the steel pipe and further assisting the steel pipe welding.

[0057] In the embodiment, the fixing rope is arranged on the base, and the fixing block is arranged on the fixing rope. Figure 1As shown in the drawings, the base 1 is provided with a semicircular groove 11. Specifically, the upper surface of the base 1 is provided with the semicircular groove 11, the radius of the semicircular groove 11 is matched with the steel pipe 4, and the length is matched with the base 1, so that the steel pipe 4 is stably placed in the semicircular groove 11 of the base 1.

[0058] In the embodiment, the base 1 is in the shape of a rectangular body, so that the base 1 is stably placed on the ground.

[0059] In the embodiment, a roller or the like is arranged on the lower side of the base 1, so that the device is easy to move.

[0060] In the embodiment, as shown in the drawings, Figures 1-2 The two side walls of the base 1 are provided with a first lug 12 and a second lug 13. Specifically, the first lug 12 and the second lug 13 are arranged on the two sides of the semicircular groove 11 in the axial direction, and the upper surfaces of the first lug 12 and the second lug 13 are located in the same plane as the upper surface of the base 1. In the embodiment, the first lug 12 and the second lug 13 are in the shape of a rectangular body, and are arranged in the middle of the two side walls of the base 1, respectively.

[0061] In the embodiment, as shown in the drawings, Figures 1-4 The first lug 12 is provided with a vertical through hole 121. When the base 1 is placed on the horizontal ground, the through hole 121 is perpendicular to the upper surface of the second lug 13 and the horizontal ground, and the through hole 121 penetrates the first lug 12.

[0062] In the embodiment, as shown in the drawings, Figures 1-5 The fixing block 3 is arranged on the vertical lower side of the first lug 12. When the steel pipe 4 is placed in the semicircular groove 11, the fixing rope 2 passes through the fixing block 3, the through hole 121 of the first lug 12, the part of the outer wall of the steel pipe 4 on the circumferential upper side, and the second lug 13 in sequence, and the two ends are detachably connected with the first lug 12 and the second lug, respectively. Thus, the part of the fixing rope 2 abuts against and is in close contact with the outer wall of the steel pipe 4 on the circumferential direction, so that the fixing rope 2 fixes the steel pipe 4 in the semicircular groove 11 of the base 1, and the steel pipe 4 is stable.

[0063] In the embodiment, the fixing rope 2 is made of a cable, a steel wire rope or the like fireproof material.

[0064] In the embodiment, the steel pipe 4 is placed in the semicircular groove 11 of the base 1, and the steel pipe 4 is fixed by the fixing rope 2, so that the position of the steel pipe 4 is stable, and the welding effect of the steel pipe 4 is good. In addition, the two ends of the fixing rope 2 are detachably connected with the second lug 13 and the fixing block 3, respectively, so that the fixing rope 2 is not damaged when it is detached, and the device can be repeatedly used, thereby reducing the construction cost.

[0065] In some embodiments, as shown in the drawings, Figures 1-5As shown, the first ear block 12 is bent downward at the end away from the base 1, and is provided with a jam bolt 5 facing the side wall of the base 1, and the through hole 121 is in the same plane as the axial direction of the jam bolt 5, so that when the end of the jam bolt 5 bent relative to the first ear block 12 moves towards the side wall of the base 1, it can abut against the rope body of the fixing rope 2, thereby pushing the rope body, causing the part of the rope body to be bent, and thereby causing the fixing rope 2 to be taut, so that the rope body abuts and closely fits the circumferential outer wall of the steel pipe 4, thereby stabilizing the fixing of the rope body to the steel pipe 4, and making the device suitable for the case where the pipe wall thickness is inconsistent due to manufacturing precision.

[0066] In some embodiments, as shown in Figures 1-3 , the end of the first ear block 12 away from the base is perpendicular to the block body of the ear block, and the axial direction of the jam bolt 5 is perpendicular to the axial direction of the through hole 121, so that the axial direction of the jam bolt 5 is perpendicular to the axial direction of the through hole 121, and thereby the axial direction of the rope body between the fixing block 3 and the through hole 121 is perpendicular to the axial direction of the jam bolt 5, and thereby the jamming effect of the jam bolt 5 is better.

[0067] In this embodiment, as shown in Figure 1 and Figure 8 , the end of the jam bolt 5 facing the side wall of the base 1 is provided with a rotating head 51, and the end face of the rotating head 51 facing the side wall of the base 1 is provided with a rope groove 511, which is adapted to the rope body and consistent with the axial direction of the through hole 121, so that when the jam bolt 5 is tightened with the fixing rope 2, part of the rope body of the fixing rope 2 is embedded in the rope groove 511, and thereby the fixing rope 2 is more stable when it abuts against the jam bolt 5.

[0068] Wherein, the rotating head 51 can be connected in the form of rotating bearing, rotating shaft, etc., so as to ensure that the rotating head 51 can rotate relative to the jam bolt 5.

[0069] In some embodiments, as shown in Figures 1-5 , one end of the fixing rope 2 is provided with a first connecting rod 6, and the lower end of the first connecting rod 6 is provided with a first limiting plate 7, the axial direction of the first connecting rod 6 is consistent with the axial direction of the fixing rope 2 when it is straightened, and the first limiting plate 7 is perpendicular to the first connecting rod 6, one of the circumferential side walls of the fixing block 3 is provided with a first recess 31, and the recess penetrates the upper and lower side walls of the fixing block 3, wherein the slot of the first recess 31 is provided on the axial side wall of the fixing block 3, and when the first connecting rod 6 is arranged in the first recess 31, the upper side wall of the first limiting plate 7 abuts and closely fits the lower side wall of the fixing plate, thereby limiting and assisting in fixing the fixing rope 2, and thereby making the position of the fixing rope 2 more stable.

[0070] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 5 andFigure 9 As shown, the first connecting rod 6 is provided with a first connecting hole 61, the two opposite side walls of the first recess 31 are each provided with a first bolt hole 32, the two first bolt holes 32 are opposite, when the first connecting rod 6 is arranged in the first recess 31, the first connecting rod 6 is located between the two first bolt holes 32, and the two first bolt holes 32 are aligned with the first connecting hole 61, the first bolt 8 passes through one of the first bolt holes 32, the first connecting hole 61 and the other first bolt hole 32 in sequence, and is threadedly connected with the two first bolt holes 32, thereby fixing the fixing rope 2, and enabling the fixing rope 2 to be detachably connected with the fixing block 3, and further enabling the fixing rope 2 to be easily installed and removed.

[0071] In this embodiment, the first recess 31 is arranged on the vertical lower side of the through hole 121, thereby enabling the fixing rope 2 to pass through the first recess 31 and the through hole 121 in the vertical direction, and further enabling the jacking bolt 5 to abut against the rope body of the fixing rope 2.

[0072] In this embodiment, the number of the first connecting holes 61 and the first bolts 8 is multiple, the multiple first connecting holes 61 are arranged in sequence and spaced apart along the axial direction of the second connecting rod 9, the two side walls of the first recess 31 are each provided with multiple first bolt holes 32, the multiple first bolts 8 are arranged in sequence and spaced apart in the vertical direction, and are respectively connected with the multiple first bolt holes 32, the multiple first bolts 8 pass through the multiple first bolt holes 32 on the same side wall, and after passing through the multiple first connecting holes 61, are threadedly connected with the multiple first bolt holes 32 on the other side wall, thereby enabling the fixing rope 2 to be more stable.

[0073] In some embodiments, as shown in Figure 1 , Figure 2 , Figure 6 and Figure 7 , one end of the fixing rope 2 is provided with the second connecting rod 9, the lower end of the second connecting rod 9 is provided with the second limiting plate 10, the axial direction of the second connecting rod 9 is consistent with the axial direction of the fixing rope 2 when the fixing rope 2 is straightened, the second limiting plate 10 is perpendicular to the second connecting rod 9, one of the circumferential side walls of the second lug 13 is provided with the second recess 131, the recess penetrates the upper side wall and the lower side wall of the second lug 13, wherein the slot of the second recess 131 is arranged on the side wall in the axial direction of the second lug 13, when the second connecting rod 9 is arranged in the second recess 131, the upper side wall of the second limiting plate 10 abuts against and fits the lower side wall of the fixing plate, thereby enabling the fixing rope 2 to be limited and assisting the fixing rope 2 to be fixed, and further enabling the position of the fixing rope 2 to be more stable, and simultaneously, the arrangement of the second recess 131 enables the fixing rope 2 to be more easily installed and removed.

[0074] In some embodiments, as shown in Figure 1 , Figure 2 and Figure 9As shown in the drawings, the device further comprises a second bolt 20, the second connecting rod 9 is provided with a second connecting hole 91, and the two opposite side walls of the second groove 131 are both provided with a second bolt hole 132; when the second connecting rod 9 is arranged in the second groove 131, the second bolt 20 passes through the two second bolt holes 132 and the second connecting hole 91.

[0075] As shown in the drawings, Figure 11 and Figure 12 As shown in the drawings, the device further comprises a second bolt 20, the second connecting rod 9 is provided with a second connecting hole 91, and the two opposite side walls of the second groove 131 are both provided with a second bolt hole 132; when the second connecting rod 9 is arranged in the second groove 131, the second connecting rod 9 is located between the two second bolt holes 132, and the two second bolt holes 132 are aligned with the second connecting hole 91, the second bolt 20 passes through one of the second bolt holes 132, the second connecting hole 91 and the other second bolt hole 132 in sequence, and is screwed with the two second bolt holes 132, so as to fix the fixing rope 2, and make the fixing rope 2 and the second lug 13 detachably connected, and further make the installation and dismounting of the fixing rope 2 simple.

[0076] As shown in the drawings, Figures 10-11 As shown in the drawings, the device further comprises a plurality of arc-shaped plates 30, the outer walls of the plurality of arc-shaped plates 30 are all adapted to the semicircular groove 11, the inner walls of the plurality of arc-shaped plates 30 are respectively provided with circular arc surfaces of different sizes, the inner wall center line of the semicircular groove 11 is provided with a plurality of assembly holes 14, the plurality of assembly holes 14 are sequentially and spaced apart along the axial direction of the semicircular groove 11, the outer wall center line of the assembly plate is provided with a plurality of assembly blocks 301, and the plurality of assembly blocks 301 are respectively adapted to the plurality of assembly holes 14, so that the device can be adapted to the steel pipes 4 of different sizes by installing the arc-shaped plates 30 with circular arc surfaces of different sizes, and then the length of the fixing rope 2 is adjusted by the jacking bolt 5 to fix the steel pipes 4, so as to fix the steel pipes 4 of different sizes, and further make the device have a wide range of applications.

[0077] In this embodiment, the assembly hole 14 can be a hemispherical hole, and the assembly block 301 can be a hemispherical block, so that the installation of the arc-shaped plate 30 is more simple.

Claims

1. An auxiliary steel pipe welding device characterized by, Include: Base (1), fixed rope (2) and fixed block (3), the base (1) is equipped with semicircular groove (11), the base (1) both sides wall is equipped with first ear block (12) and second ear block (13), the first ear block (12) and second ear block (13) are opposite and are arranged in the axial direction both sides of semicircular groove (11), the first ear block (12) is equipped with vertical through hole (121); The fixed block (3) is arranged in the vertical downside of the first ear block (12), the fixed rope (2) passes through the fixed block (3), the first ear block (12) and the second ear block (13) in turn, and both ends are detachably connected with the first ear block (12) and the second ear block (13) respectively, when the steel pipe (4) is placed in the semicircular groove (11), the fixed rope (2) part rope body is in contact with the circumferential outer wall of the steel pipe (4).

2. The auxiliary steel pipe welding apparatus according to claim 1, characterized by: The end of the first ear block (12) away from the base (1) is bent downward, and a tightening bolt (5) is arranged towards the side wall of the base (1), the axial direction of the through hole (121) and the axial direction of the tightening bolt (5) are in the same plane, and the fixed rope (2) passes through the through hole (121).

3. The auxiliary steel pipe welding apparatus according to claim 2, characterized by: The end of the first ear block (12) away from the base (1) is perpendicular to the block body of the first ear block (12), and the axial direction of the tightening bolt (5) is perpendicular to the axial direction of the through hole (121).

4. The auxiliary steel pipe welding apparatus according to claim 3, characterized by: One end of the fixed rope (2) is provided with a first connecting rod (6), a first limiting plate (7) is arranged at the lower end of the first connecting rod (6), a first recess (31) is formed in the side wall of the fixed block (3), and when the first connecting rod (6) is arranged in the first recess (31), the upper side wall of the first limiting plate (7) is in contact with the lower side wall of the fixed block (3).

5. The auxiliary steel pipe welding apparatus according to claim 4, characterized by: Further comprising a first bolt (8), the first connecting rod (6) is provided with a first connecting hole (61), the opposite side walls of the first recess (31) are both provided with a first bolt hole (32), and when the first connecting rod (6) is arranged in the first recess (31), the first bolt (8) passes through the two first bolt holes (32) and the first connecting hole (61).

6. The auxiliary steel pipe welding apparatus according to claim 4, characterized by: The first recess (31) is arranged vertically below the through hole (121).

7. The supplemental pipe welding apparatus of claim 1, wherein: The second ear block (13) is provided with a second recess (131), and the other end of the fixed rope (2) is provided with a second connecting rod (9). The second connecting rod (9) is provided with a second limiting plate (10) at the lower end, and when the second connecting rod (9) is arranged in the second recess (131), the upper side wall of the second limiting plate (10) is in contact with the lower side wall of the second ear block (13).

8. The auxiliary steel pipe welding apparatus according to claim 7, characterized by: Further comprising a second bolt (20), the second connecting rod (9) is provided with a second connecting hole (91), the opposite side walls of the second recess (131) are both provided with a second bolt hole (132), and when the second connecting rod (9) is arranged in the second recess (131), the second bolt (20) passes through the two second bolt holes (132) and the second connecting hole (91).

9. The supplemental pipe welding apparatus of claim 1, wherein: Also include a plurality of arc-shaped plate (30), a plurality of said arc-shaped plate (30) outer wall with the semicircular groove (11) adaptation, a plurality of said arc-shaped plate (30) inner wall is respectively provided with different size arc surface, a plurality of said arc-shaped plate (30) can be with the semicircular groove (11) detachable connection.

10. The supplemental pipe welding apparatus of claim 9, wherein: The semicircular groove (11) inner wall centerline is provided with a plurality of assembly holes (14), and the outer wall of the arc-shaped plate (30) is provided with a plurality of assembly blocks (301), and the plurality of assembly blocks (301) are respectively matched with the plurality of assembly holes (14).

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