An argon-filled protective plug for welding of super-large-caliber stainless steel pipelines

Abstract

The present application relates to an argon-filled protective plug for welding of super-large-caliber stainless steel pipelines, including a plug body and a traction rope, the traction rope is fixedly connected to the plug body, and the traction rope is used to pull the plug body to move in the pipeline; the plug body abuts against the inner wall of the pipeline, and the plug body is also provided with an exhaust hole; the traction rope is fixedly connected to the plug body. In this embodiment, the staff installs the plug body on both sides of the pipeline welding position, so that the plug body is sealed and connected to the inner wall of the pipeline; then, the argon gas filling pipe is inserted into the exhaust hole of the plug body on one side, so that the argon gas fills the soft pipeline welding area, thereby improving the welding quality of the pipeline.

Description

Technical Field

[0001] The present application relates to the technical field of chemical equipment, and in particular to an argon-filled protective plug for welding of extra-large-diameter stainless steel pipelines. Background Art

[0002] In petrochemical plants, workers often need to weld some extra-large diameter (≥1000mm) stainless steel pipes during production inspections, overhauls and new pipeline installations.

[0003] In the process of welding ultra-large diameter stainless steel pipes, the biggest challenge is how to carry out argon filling protection during welding. If the argon filling protection is not in place, it will directly affect the quality of the weld.

[0004] In the prior art, there are two traditional construction methods.

[0005] The first option is that the staff installs a rubber airbag near the weld inside the original operating pipeline, and then fills the pipeline with argon gas; after the welding is completed, the staff cuts the airbag into pieces and cleans the shredded airbag out of the pipeline.

[0006] The second option is that workers enter the newly installed pipeline and use gas hoods on the welds. The workers inside the pipeline will move the gas hood synchronously to the position where the welder outside welds. After the welding is completed, the workers will come out of the pipeline.

[0007] The above two construction methods have their own advantages and disadvantages. In the first option, the large-diameter airbag is more expensive and heavier, and it is inconvenient for workers to install and remove it after entering the pipeline; and if the exit position is narrow after welding, the airbag cannot be completely removed. In the second option, workers need to keep moving the gas hood inside the pipeline. Too much argon gas in the pipeline poses a risk of suffocation to people, which is a huge safety hazard for people inside. Utility Model Content

[0008] In order to save costs and reduce construction safety risks, the present application provides an argon-filled protective plug for welding of extra-large diameter stainless steel pipes.

[0009] The present application provides an argon-filled protective plug for welding of super-large-caliber stainless steel pipelines, which adopts the following technical solution:

[0010] A argon-filled protective plug for welding of extra-large-caliber stainless steel pipelines, comprising a plug body and a traction rope, wherein the traction rope is fixedly connected to the plug body, and the traction rope is used to pull the plug body to move in the pipeline; the plug body comprises a flexible plate, a rigid plate and a pulling assembly; the rigid plate comprises a first rigid plate and a second rigid plate, the first rigid plate and the second rigid plate are arranged on both sides of the flexible plate, and the pulling assembly is used to clamp and fix the rigid plate and the flexible plate, the diameter of the flexible plate is larger than the inner diameter of the pipeline, the flexible plate abuts against the inner circumferential wall of the pipeline, the diameter of the rigid plate is smaller than the inner diameter of the pipeline, an avoidance gap is provided between the rigid plate and the inner circumferential wall of the pipeline, and the plug body is also provided with an exhaust hole; the traction rope is fixedly connected to the pulling assembly.

[0011] By adopting the above technical solution, the staff installs the plug body on both sides of the pipeline welding position, so that the plug body is sealed and connected to the inner wall of the pipeline; then, the argon gas filling tube is inserted into the exhaust hole of the plug body on one side, so that the argon gas is filled in the soft pipe welding area, thereby improving the welding quality of the pipeline.

[0012] Optionally, it also includes a connecting piece, which is fixedly connected to the pulling assembly, and the connecting piece is provided with a circular hole, the traction rope passes through the circular hole, and the traction rope is detachably connected to the connecting piece.

[0013] By adopting the above technical solution, the pulling assembly and the traction rope are connected through a connecting piece, so that it is convenient for workers to install.

[0014] Optionally, a spring buckle is provided at the fixed end of the traction rope, the spring buckle passes through the circular hole, and the spring buckle is detachably connected to the connecting piece.

[0015] By adopting the above technical solution, the spring buckle is connected with the connecting piece buckle, so that it is convenient for the staff to connect the second traction rope and the plug body.

[0016] Optionally, a plurality of the tensioning assemblies are provided, and the plurality of the tensioning assemblies are arranged at intervals; the traction rope includes a first traction rope and a second traction rope, the first traction rope is fixedly connected to the ends of the second traction rope, and the second traction rope is connected to the tensioning assemblies one by one.

[0017] By adopting the above technical solution, it is convenient for workers to pull the plug body, and the stability of the plug body moving in the pipeline is also improved.

[0018] Optionally, there are five tensioning components, and the tensioning components are arranged at the center of the rigid plate and on the corners of a square with the center of the circle as the rotation center.

[0019] By adopting the above technical solution, it is convenient for workers to pull the plug body, and the stability of the plug body moving in the pipeline is also improved.

[0020] Optionally, the first rigid plate is formed by splicing a plurality of first components, and the second rigid plate is formed by splicing a plurality of second components.

[0021] By adopting the above technical solution, it is convenient for the staff to take out the first rigid plate and the second rigid plate from the pipeline in blocks to adapt to the situation where the pipeline outlet is reduced.

[0022] Optionally, the first component and the second component are arranged alternately.

[0023] By adopting the above technical solution, the first component and the second component are arranged alternately to improve the overall rigidity of the plug body and reduce the structural deformation of the plug body.

[0024] Optionally, it further includes a reinforcing bar, wherein the reinforcing bar is provided with a through hole for the tensioning assembly to pass through; the reinforcing bar is in contact with the rigid plate, and the reinforcing bar is staggered with the first component or the second component.

[0025] By adopting the above technical solution, the overall rigidity of the plug body is improved through the connection between the first component and the reinforcing strip, so that the first rigid plate and the second rigid plate have a good restraining effect on the flexible plate.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The staff installs the plug body on both sides of the pipeline welding position, so that the plug body is sealed and connected to the inner wall of the pipeline; then, the argon gas filling pipe is inserted into the exhaust hole of the plug body on one side, so that the argon gas fills the soft pipe welding area, thereby improving the welding quality of the pipeline;

[0028] 2. The first rigid plate is composed of several first parts, and the second rigid plate is composed of several second parts, so that it is convenient for the staff to take out the first rigid plate and the second rigid plate from the pipeline in blocks to adapt to the situation of the pipeline outlet being reduced;

[0029] 3. Through the connection between the first component and the reinforcing strip, the overall rigidity of the plug body is improved, so that the first rigid plate and the second rigid plate have a good restraining effect on the flexible plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the plug structure in Example 1.

[0031] Figure 2 It is a cross-sectional view showing the plug structure in Example 1.

[0032] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0033] Figure 4 It is a schematic diagram of the plug structure in Example 2.

[0034] Figure 5 It is an exploded view of the plug structure in Example 2.

[0035] Figure 6 yes Figure 4 Enlarged view of point B in the middle.

[0036] Figure 7 It is a schematic diagram of the plug structure in Example 3.

[0037] Explanation of the reference numerals: 1. pipeline; 11. first pipeline; 12. second pipeline; 13. chamber; 2. plug body; 21. flexible plate; 22. rigid plate; 221. first rigid plate; 2211. first component; 222. second rigid plate; 2221. second component; 23. tension assembly; 231. connecting screw; 232. fastening nut; 24. exhaust hole; 25. steel ring; 26. metal sheet; 261. mounting hole; 262. circular hole; 3. traction rope; 31. first traction rope; 32. second traction rope; 4. spring buckle; 5. reinforcement strip; 6. argon inflation hose. DETAILED DESCRIPTION

[0038] The following is combined with Figure 1-7 This application is described in further detail.

[0039] The present application discloses an argon-filled protective plug for welding of ultra-large-caliber stainless steel pipes. Figure 1 In this embodiment, the super-large-diameter stainless steel pipeline 1 includes a first pipeline 11 and a second pipeline 12, and the first pipeline 11 and the second pipeline 12 are butt-welded. In this embodiment, the diameter of the super-large-diameter stainless steel pipeline 1 is 1000 mm.

[0040] Reference Figure 1 The argon-filled protective plug used for welding of extra-large-diameter stainless steel pipelines 1 includes a plug body 2 and a traction rope 3. The traction rope 3 is fixedly connected to the plug body 2, and the traction rope 3 is used to pull the plug body 2 to move in the pipeline 1.

[0041] Reference Figure 2 and Figure 3 The plug body 2 includes a flexible plate 21, a rigid plate 22, a tension component 23 and a connecting piece. The tension component 23 is used to clamp the flexible plate 21 and the rigid plate 22. The connecting piece is fixedly connected to the tension component 23, and the connecting piece is connected to the traction rope 3.

[0042] Reference Figure 2 and Figure 3 There are two rigid plates 22, which are arranged on both sides of the flexible plate 21. The tension assembly 23 is used to clamp and fix the rigid plate 22 and the flexible plate 21, and the traction rope 3 is fixedly connected to the tension assembly 23; the diameter of the flexible plate 21 is larger than the inner diameter of the pipeline 1, and the flexible plate 21 abuts against the inner wall of the pipeline 1. The diameter of the rigid plate 22 is smaller than the inner diameter of the pipeline 1. There is an avoidance gap between the rigid plate 22 and the inner wall of the pipeline 1, and the avoidance gap provides deformation space for the deformation of the outer edge of the flexible plate 21. Among them, the plug body 2 is also penetrated with an exhaust hole 24.

[0043] Reference Figure 2 and Figure 3 In this embodiment, the flexible plate 21 is made of 200mm thick high-density sponge. According to the inner diameter of the pipe 1, the high-density sponge is cut into a disc shape. The outer diameter of the cut flexible plate 21 should be 10mm larger than the inner diameter of the pipe 1. The outer edge of the circular sponge should be checked as neatly as possible to ensure the sealing. In other embodiments, the flexible plate 21 can be cut from flexible deformable materials such as rubber plates and silicone plates; the thickness of the flexible plate 21 between the outer periphery of the rigid plate 22 and the inner circumferential wall of the pipe 1 can be reduced to facilitate the deformation of the edge of the flexible plate 21, so that the flexible plate 21 and the inner circumferential wall of the pipe 1 are tightly abutted by the deformation of the outer periphery of the flexible plate 21, so as to improve the sealing between the flexible plate 21 and the inner circumferential wall of the pipe 1.

[0044] Reference Figure 2 and Figure 3 The rigid plate 22 is cut from a 10 mm thick wooden template. According to the inner diameter of the pipe 1, the wooden template is cut into a disc shape. The outer diameter of the cut rigid plate 22 is 200-300 mm larger than the inner diameter of the pipe 1. Thus, there is space between the rigid plate 22 and the inner wall of the pipe 1 for the outer periphery of the flexible member to deform, so as to improve the sealing performance of the connection between the flexible member and the inner wall of the pipe 1. In other embodiments, the rigid plate 22 can be made of rigid materials such as aluminum alloy plates and stainless steel plates.

[0045] Reference Figure 1 and Figure 3 , there are a plurality of pulling assemblies 23, and the plurality of pulling assemblies 23 are arranged at intervals. The pulling rope 3 includes a first pulling rope 31 and a second pulling rope 32, the first pulling rope 31 and the second pulling rope 32 are fixedly connected at their ends, and the second pulling rope 32 is connected to the pulling assemblies 23 one by one. This makes it easier for the staff to pull the plug body 2, and also improves the stability of the plug body 2 moving in the pipeline 1.

[0046] Reference Figure 1 and Figure 3In this embodiment, five tensioning components 23 are provided, and the tensioning components 23 are arranged at the center of the rigid plate 22 and at the corners of the square with the center of the circle as the rotation center. The staff marks the rotation center of the square at the center of the circular rigid plate 22, draws a square with a side length of 400 mm, and then drills a first through hole of 14 mm in the center and four corners of the square. Similarly, the staff also drills a second through hole on the flexible plate 21 for the tensioning components 23 to pass through.

[0047] Reference Figure 1 and Figure 3 The tension assembly 23 includes a connecting screw 231 and a fastening nut 232. The connecting screw 231 can be of M12 specification. Two fastening bolts are provided, and two fastening nuts 232 are arranged on the side of the rigid part away from the flexible part. The fastening nuts 232 are threadedly connected to the connecting screw 231, and the fastening nuts 232 abut against the rigid part. Thus, the flexible plate 21 and the first rigid plate 221 and the second rigid plate 222 on both sides are fixed together. In this embodiment, the connecting member is a steel ring 25, and the steel ring 25 is welded and fixed to the fastening nut 232. In other embodiments, a gasket can be further provided between the fastening nut 232 and the rigid plate 22.

[0048] In this embodiment, the diameter of the first traction rope 31 is larger than the diameter of the second traction rope 32, and the ends of the five second traction ropes 32 are tied and fixed to the ends of the first traction rope 31. The length of the first traction rope 31 should be selected according to the installation position of the plug. Generally, the first traction rope 31 should be able to be exposed about 6m from the pipe opening. In other embodiments, the first traction rope 31 and the five second traction ropes 32 can also be fixedly connected by rope clips. The second traction rope 32 is tied and fixed after passing through the steel ring 25.

[0049] The implementation principle of an argon-filled protective plug for welding of super-large-caliber stainless steel pipelines in the present application is as follows:

[0050] Reference Figures 1 to 3 Before the staff align the first pipe 11 with the second pipe 12, they insert the two plug bodies 2 into the first pipe 11 and the second pipe 12 respectively, and keep the distance between the plug body 2 and the pipe 1 at about 200-300mm to prevent the plug body 2 from being burned by high temperature during welding. At this time, the flexible plate 21 in the plug body 2 is deformed and closely abuts against the inner wall of the pipe 1, so that the two plug bodies 2 and the first pipe 11 and the second pipe 12 are surrounded by a chamber 13. Then, the staff pulls the tail of the first pulling rope to lead it out from the outlet end of the pipe 1.

[0051] In this embodiment, the staff inserts the argon gas charging hose 6 into the exhaust hole 24 of the plug body 2 in the first pipeline 11; and the staff uses a clamp to fix the joint of the first pipeline 11 and the second pipeline 12. The argon gas charging hose 6 is externally connected to the argon gas supply device, so that the argon gas enters the chamber 13 from the exhaust hole 24 of the plug body 2 in the first pipeline 11; and squeezes the original air in the chamber 13 toward the plug body 2 in the second pipeline 12, so that the air in the chamber 13 is discharged from the exhaust hole 24 in the first pipeline 11; so that the argon gas fills the chamber 13, so that the argon gas has a protective effect on the welding position of the first pipeline 11 and the second pipeline 12.

[0052] Subsequently, the staff welds the first pipe 11 and the second pipe 12 , and after the welding is completed and cooled, the staff pulls the first traction rope 31 to pull the plug body 2 to the outlet of the pipe 1 .

[0053] Example 2

[0054] The difference between this embodiment 2 and embodiment 1 is as follows:

[0055] If the outlet end of the pipeline 1 has a smaller diameter than the link end of the pipeline 1, it is difficult for the staff to remove the plug body 2 from the pipeline 1. Therefore, the plug body 2 is further improved in this embodiment.

[0056] Reference Figure 4 and Figure 5 The rigid plate 22 includes a first rigid plate 221 and a second rigid plate 222, and the first rigid plate 221 and the second rigid plate 222 are arranged on both sides of the flexible plate 21. The first rigid plate 221 is formed by splicing a plurality of first components 2211, and the second rigid plate 222 is formed by splicing a plurality of second components 2221. The first components 2211 and the second components 2221 are staggered to improve the overall rigidity of the plug body 2 and reduce the structural deformation of the plug body 2.

[0057] Reference Figure 4 and Figure 6 In this embodiment, the connecting member is a metal sheet 26, and the connecting member is provided with a mounting hole 261 and an annular hole 262. The connecting screw 231 is passed through the mounting hole 261, and the connecting member is arranged between the fastening nut 232 and the first rigid plate 221 to fix the position of the connecting member. The fixed end of the second traction rope 32 is provided with a spring buckle 4, and the spring buckle 4 is buckled and connected with the annular hole 262, so that it is convenient for the staff to connect the second traction rope 32 with the plug body 2.

[0058] Reference Figure 4 and Figure 5Taking the first pipe 11 as an example, the staff pulls the plug body 2 to the outlet of the first pipe 11; the staff releases the pulling assembly 23, thereby sequentially taking the first component 2211, the flexible plate 21, and the second component 2221 out of the first pipe 11; thus, it is convenient for the staff to move the plug body 2 out of the first pipe 11. After the staff moves several components of the plug body 2 out of the first pipe 11, they can reassemble the plug body 2 in the outside world for next use.

[0059] Example 3

[0060] The difference between this embodiment 3 and embodiment 2 is that:

[0061] Reference Figure 7 The plug also includes a reinforcing strip 5, which is provided with a third through hole for the connecting bolt to pass through; the reinforcing strip 5 is in contact with the rigid plate 22, and the reinforcing strip 5 is staggered with the first component 2211 or the second component 2221. The first component 2211 is used as an example for demonstration in this embodiment. Thus, through the connection between the first component 2211 and the reinforcing strip 5, the overall rigidity of the plug body 2 is improved, so that the first rigid plate 221 and the second rigid plate 222 have a good restraining effect on the flexible plate 21.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An argon-filled protective plug for welding of super-large-caliber stainless steel pipes, characterized by: The invention comprises a plug body (2) and a traction rope (3), wherein the traction rope (3) is fixedly connected to the plug body (2), and the traction rope (3) is used to pull the plug body (2) to move in the pipeline (1); the plug body (2) comprises a flexible plate (21), a rigid plate (22) and a pulling assembly (23); the rigid plate (22) comprises a first rigid plate (221) and a second rigid plate (222), and the first rigid plate (221) and the second rigid plate (222) are arranged on the flexible plate (21 ) on both sides, the pulling assembly (23) is used to clamp and fix the rigid plate (22) and the flexible plate (21), the diameter of the flexible plate (21) is larger than the inner diameter of the pipeline (1), the flexible plate (21) abuts against the inner circumferential wall of the pipeline (1), the diameter of the rigid plate (22) is smaller than the inner diameter of the pipeline (1), an escape gap is provided between the rigid plate (22) and the inner circumferential wall of the pipeline (1), and the plug body (2) is also provided with an exhaust hole (24); the traction rope (3) is fixedly connected to the pulling assembly (23).

2. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 1 is characterized in that: It also comprises a connecting piece, the connecting piece is fixedly connected to the pulling assembly (23), the connecting piece is provided with a circular hole (262), the traction rope (3) passes through the circular hole (262), and the traction rope (3) is detachably connected to the connecting piece.

3. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 2 is characterized in that: The fixed end of the traction rope (3) is provided with a spring buckle (4), the spring buckle (4) passes through the circular hole (262), and the spring buckle (4) is detachably connected to the connecting piece.

4. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 1 is characterized in that: A plurality of the tensioning assemblies (23) are provided, and the plurality of the tensioning assemblies (23) are arranged at intervals; the traction rope (3) comprises a first traction rope (31) and a second traction rope (32), the first traction rope (31) and the second traction rope (32) are fixedly connected at their ends, and the second traction rope (32) is connected to the tensioning assemblies (23) in a one-to-one correspondence.

5. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 4 is characterized in that: Five tensioning components (23) are provided, and the tensioning components (23) are arranged at the center of the circle of the rigid plate (22) and at the corners of a square with the center of the circle as the rotation center.

6. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 4 is characterized in that: The first rigid plate (221) is formed by splicing together a plurality of first components (2211), and the second rigid plate (222) is formed by splicing together a plurality of second components (2221).

7. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 6 is characterized in that: The first component (2211) and the second component (2221) are arranged alternately.

8. The argon-filled protective plug for super-large-caliber stainless steel pipeline welding according to claim 6 is characterized in that: It also comprises a reinforcing strip (5), the reinforcing strip (5) being provided with a through hole for the tensioning component (23) to pass through; the reinforcing strip (5) is in contact with the rigid plate (22), and the reinforcing strip (5) is arranged alternately with the first component (2211) or the second component (2221).

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