Pipe welding sealing protection device

Abstract

The invention belongs to the technical field of pipe welding, and particularly relates to a pipe welding sealing protection device which comprises a sealing assembly connected with an argon supply device and used for sealing one end of a pipe and filling argon into the pipe through the argon supply device; the air pressure regulation and control assembly comprises a positioning part connected to the other end of the pipe in a sealed mode, a first exhaust hole formed in the center of the positioning part and communicated with the interior and the exterior of the pipe, and a movable part movably arranged at the end of the positioning part and used for adjusting the aperture size of the first exhaust hole; and the air pressure detection piece is located at one end of the air pressure regulation and control assembly, and the detection end of the air pressure detection piece movably extends into the first exhaust hole so as to detect the air pressure value in the pipe. The exhaust hole with the hole diameter capable of being dynamically adjusted is formed in the exhaust end of the pipe, and it can be ensured that the internal pressure of the pipe is stabilized within the needed range, so that the internal pressure of the pipe is dynamically balanced, pressure fluctuation is avoided, and stability is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipe welding, and particularly relates to a pipe welding sealing and protecting device. Background Art

[0002] In industrial fields such as petrochemical, natural gas transportation, nuclear power, and heat supply, the pipeline system, as the core carrier for material transmission, its welding quality is directly related to the safety and reliability of the entire project. Pipe butt welding is the most common construction process in pipe installation and maintenance, and the welding quality control of circumferential welds is the key link. For pipes made of materials such as carbon steel, stainless steel, and alloy steel, during the welding process, the molten pool and the high-temperature weld metal are extremely likely to chemically react with oxygen, nitrogen, water vapor, etc. in the air, resulting in defects such as oxidation, pores, and cracks in the weld, seriously affecting the mechanical properties and corrosion resistance of the pipe;

[0003] In the prior art, for the gas protection process in the pipe butt joint scenario, usually, argon (inert gas) is sealed and filled at one end of the pipe, and an exhaust hole is provided at the other end to discharge the air inside the pipe and the waste gas generated by welding, forming a local inert gas environment inside the pipe. This process utilizes the low thermal conductivity and chemical inertness of argon to form a gas curtain barrier at the welds inside and outside the pipe, effectively isolating the contact between the air and the high-temperature molten pool. With the high-precision motion control of an automatic welding machine (such as an orbital welding robot, a numerically controlled special welding machine, etc.) and the adaptive adjustment of welding parameters (current, speed, arc length, etc.), the automatic welding of pipe circumferential welds can be realized, significantly improving the welding efficiency and quality consistency, and reducing welding defects caused by manual operation.

[0004] However, when sealing in the above manner, it is often through adhesive tape adhered to the end of the pipe. After sealing the inside of the pipe, an exhaust hole is opened on the adhesive tape to facilitate the discharge of gas. In order to avoid a large internal pressure in the pipe, a relatively large exhaust hole often needs to be opened, resulting in waste of argon. At the same time, due to the fixed size of the exhaust hole, the internal pressure of the pipe is extremely likely to change under the influence of external forces. For example: sudden pressure rise or fall caused by fixed intake flow and changes in pipe volume (such as welding thermal expansion, gas accumulation in a long pipe), to prevent high pressure from flushing away the molten pool or low pressure from inhaling air, thus affecting the welding quality of the pipe.

[0005] In view of this, the present invention provides a pipe welding sealing and protecting device to solve the above problems. Summary of the Invention

[0006] To achieve the above object, the present invention provides the following technical solution: A pipe welding sealing and protecting device, comprising:

[0007] A sealing assembly, connected to an argon gas supply device, for sealing one end of the pipe and filling argon into the pipe through the argon gas supply device;

[0008] An air pressure regulating assembly includes a positioning portion sealedly connected to the other end of the pipe, a first exhaust hole opened in the center of the positioning portion and communicating with the inside and outside of the pipe, and a movable portion movably disposed at the end of the positioning portion for adjusting the aperture size of the first exhaust hole;

[0009] The air pressure detection component is located at one end of the air pressure regulating component, and its detection end can be movably extended into the first exhaust hole to detect the air pressure value in the pipe.

[0010] As a preferred pipe welding sealing protection device of the present invention, it also includes a telescopic component connected between the air pressure regulating component and the air pressure detection component. The telescopic component is used to axially position the air pressure detection component and can drive the air pressure detection component to move axially along the first exhaust hole under the action of external force, so that the detection end of the air pressure detection component extends into or moves out of the first exhaust hole.

[0011] As a preferred pipe welding sealing protection device of the present invention, the sealing assembly includes an inflatable expansion piece, an air valve provided on the surface of the inflatable expansion piece, and an inflatable tube that seals and passes through the inflatable expansion piece.

[0012] As a preferred embodiment of the pipe welding sealing protection device of the present invention, the air pressure regulating assembly further comprises an adjusting portion rotatably connected to the end of the positioning portion;

[0013] The movable portion is connected between the positioning portion and the adjusting portion, and is movable by the rotation of the adjusting portion.

[0014] As a preferred pipe welding sealing protection device of the present invention, the positioning portion includes a positioning plate, an elastic connector axially connected to the positioning plate, and a sliding groove provided on the end surface of the positioning plate away from the elastic connector.

[0015] As a preferred pipe welding sealing protection device of the present invention, the adjustment part includes a rotating disk axially connected to the end of the positioning disk, a plurality of guide holes radially opened on the surface of the rotating disk and arranged in a ring along the axis of the rotating disk, and a second exhaust hole axially opened on the surface of the rotating disk.

[0016] As a preferred pipe welding sealing protection device of the present invention, the movable part includes a plurality of movable blocks arranged in a ring along the axis of the first exhaust hole, a guide column connected to the surface of the movable block and slidably connected to the slide groove, and a slider connected to the surface of the movable block and slidably connected to the guide hole.

[0017] As a preferred pipe welding sealing protection device of the present invention, the telescopic assembly includes an axially arranged mounting seat and a telescopic rod vertically connected to the end face of the mounting seat.

[0018] Preferably, for a pipe welding and sealing protection device of the present invention, a through hole is provided at the center of the mounting base, and the detection end of the air pressure detection member is axially inserted into the through hole and installed on the end face of the mounting base.

[0019] Preferably, for a pipe welding and sealing protection device of the present invention, evenly arranged meshing teeth are provided on the circumferential side of the rotating disk, and a transmission rod that makes a circular motion driven by a driving member is provided on one side of the rotating disk. The circumferential side of the transmission rod meshes with the meshing teeth to drive the rotating disk to rotate.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By providing an exhaust hole with a dynamically adjustable aperture at the exhaust end of the pipe, the operator can adjust the aperture of the exhaust hole in real time according to the air pressure inside the pipe to adjust the exhaust rate, ensuring that the internal pressure of the pipe is stably within the required range, thereby achieving dynamic balance of the internal pressure of the pipe and avoiding pressure fluctuations to improve stability. Secondly, through the dynamic adjustment of the aperture of the exhaust hole, adaptive aperture adjustment can be carried out at different stages during pipe welding, thereby improving the utilization rate of argon and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:

[0023] Figure 1 is a schematic cross-sectional structure diagram of the connection between the present invention and the pipe to be welded;

[0024] Figure 2 is a schematic three-dimensional structure diagram of the present invention;

[0025] Figure 3 is a schematic cross-sectional structure diagram of the sealing assembly of the present invention;

[0026] Figure 4 is an exploded structure diagram of the air pressure regulation assembly of the present invention;

[0027] Figure 5 is a schematic structure diagram of the positioning part of the present invention;

[0028] Figure 6 is a schematic structure diagram of the adjustment part of the present invention;

[0029] Figure 7 is a schematic structure diagram of the movable part of the present invention;

[0030] Figure 8 is a schematic diagram of the movable structure of the movable part of the present invention;

[0031] Figure 9 Schematic diagram of the structure when the air pressure regulation component, telescopic component and air pressure detection component of the present invention cooperate;

[0032] Figure 10 Schematic diagram of a preferred embodiment of the present invention.

[0033] In the figure: 1. Sealing component; 11. Inflatable expansion part; 12. Valve nozzle; 13. Inflation pipe; 2. Air pressure regulation component; 21. Positioning part; 211. Positioning disk; 212. Elastic connecting piece; 213. First exhaust hole; 214. Chute; 22. Adjusting part; 221. Rotating disk; 222. Guide hole; 223. Second exhaust hole; 23. Moving part; 231. Moving block; 232. Guide post; 233. Slide block; 3. Telescopic component; 31. Mounting seat; 32. Telescopic rod; 4. Air pressure detection component; 5. Meshing teeth; 6. Transmission rod; 7. Driving part; 8. Microcontroller. Specific embodiments

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] The present invention relates to a pipe welding sealing protection device, which can realize the dynamic regulation of the air pressure inside the pipe during pipe welding to stabilize the air pressure inside the pipe, improve the utilization rate of argon gas, thereby reducing production costs and improving welding quality. As Figures 1 - 2 shown, it includes: a sealing component 1 connected to an argon gas supply device, and an air pressure regulation component 2 installed at the other end of the pipe. The sealing component 1 can seal one end of the pipe and fill argon gas into the pipe through the connected argon gas supply device;

[0036] Specifically, as Figure 3As shown in the figure, the sealing assembly 1 includes an inflatable expansion member 11, a valve nozzle 12 provided on the surface of the inflatable expansion member 11, and an inflation pipe 13 penetrating through the inflatable expansion member 11. The inflatable expansion member 11 is made of a flexible material such as rubber or polyurethane, and has a gas accommodation cavity inside. The gas accommodation cavity is communicated with the outside through the valve nozzle 12, and the inflation and deflation of the inflatable expansion member 11 are realized through the valve nozzle 12. During use, the inflatable expansion member 11 is placed inside the pipe, and the inflatable expansion member 11 is inflated through the valve nozzle 12 to make the inflatable expansion member 11 expand, so as to adaptively seal the end of the pipe. The inflation pipe 13 is connected to an argon supply device through a hose, and the argon supply device outputs argon, and finally the argon is sent into the pipe through the inflation pipe 13.

[0037] As Figure 4 shown in the figure, the air pressure regulation assembly 2 includes a positioning portion 21 sealingly connected to the other end of the pipe, a first exhaust hole 213 axially opened in the center of the positioning portion 21 and communicating the inside and outside of the pipe, and a movable portion 23 movably provided at the end of the positioning portion 21 for adjusting the aperture size of the first exhaust hole 213; it also includes an adjusting portion 22 rotatably connected to the end of the positioning portion 21; the movable portion 23 is connected between the positioning portion 21 and the adjusting portion 22 and moves by the rotation of the adjusting portion 22. By installing the air pressure regulation assembly 2 at the other end of the pipe away from the sealing assembly 1, by rotating the adjusting portion 22, the sliding of the movable portion 23 can be realized, so as to adjust the aperture size of the first exhaust hole 213. Due to the filling of argon inside the pipe, the air originally existing inside the pipe is discharged through the first exhaust hole 213, and finally a local inert gas environment is formed inside the pipe.

[0038] Among them, in combination with Figure 5 shown in the figure, the positioning portion 21 includes a positioning disk 211, an elastic connecting member 212 axially connected to the positioning disk 211, and a sliding groove 214 opened on the end face of the positioning disk 211 facing away from the elastic connecting member 212. The elastic connecting member 212 is made of rubber material, and when it is inserted into the other end of the pipe, an interference fit connection between the positioning disk 211 and the pipe can be realized.

[0039] Further, as Figure 6 shown in the figure, the adjusting portion 22 includes a rotating disk 221 axially rotatably connected to the end of the positioning disk 211 through a sealing bearing, a plurality of guiding holes 222 radially opened on the surface of the rotating disk 221 and arranged annularly along the axis of the rotating disk 221, and a second exhaust hole 223 axially opened on the surface of the rotating disk 221 and communicating and matching with the first exhaust hole 213; as Figure 7As shown in the figure, the movable part 23 includes a plurality of movable blocks 231 arranged annularly along the axis of the first exhaust hole 213, a guide post 232 connected to the surface of the movable block 231 and slidably connected to the chute 214, and a slider 233 connected to the surface of the movable block 231 and slidably connected to the guide hole 222. The movable block 231 is triangular, and its tip is located on the axis of the first exhaust hole 213. After its annular arrangement, it can seal the first exhaust hole 213 and the second exhaust hole 223. In this embodiment, six groups of movable blocks 231 and guide holes 222 are correspondingly provided, and the chute 214 is hexagonal. When the rotating disk 221 is rotated, the guide hole 222 will exert a component force on the guide post 232, thereby driving the slider 233 to slide along the chute 214 and driving the movable block 231 to move radially, so as to realize the adjustment of the aperture of the first exhaust hole 213. When the internal air pressure of the pipe is relatively high, the aperture of the first exhaust hole 213 can be enlarged to increase the discharge of argon and reduce the internal air pressure of the pipe to prevent the molten pool from being dispersed by high pressure; on the contrary, if the internal air pressure of the pipe is relatively low, the aperture of the first exhaust hole 213 can be reduced to reduce the discharge of argon to prevent oxidation caused by low pressure sucking in air.

[0040] In summary and combined with actual use, through the adjustability of the aperture of the first exhaust hole 213, the aperture of the first exhaust hole 213 can be adjusted to a large aperture during the initial argon filling stage, so as to quickly discharge the air in the pipeline and shorten the replacement time; during the welding stage: according to the gas expansion caused by the welding heat input, reduce the aperture to maintain a stable laminar flow protection to avoid turbulent flow from drawing in air; during the finishing stage: gradually reduce the aperture and extend the argon purging time to protect the high-temperature weld from oxidation during the cooling process, so as to meet the requirements of each stage of the welding process, effectively improve the use efficiency of argon, reduce argon consumption and reduce production costs.

[0041] Furthermore, in order to facilitate the real-time and accurate measurement of the internal air pressure of the pipe, so as to adjust the aperture of the first exhaust hole 213 according to the actual air pressure value to dynamically balance the internal air pressure of the pipe and ensure that the internal pressure of the pipe is stable within the required range, as Figure 9 shown, a pressure detection member 4 is provided at one end of the air pressure control assembly 2, and a telescopic assembly 3 is provided between the air pressure control assembly 2 and the pressure detection member 4. The telescopic assembly 3 is used to axially position the pressure detection member 4 and can drive the pressure detection member 4 to move axially along the axis of the first exhaust hole 213 under the action of an external force, so that the detection end of the pressure detection member 4 extends into or out of the first exhaust hole 213 to detect the internal air pressure value of the pipe.

[0042] Specifically, the telescopic component 3 includes a mounting base 31 arranged axially, and a telescopic rod 32 vertically connected to the end face of the mounting base 31. The other end of the telescopic rod 32 is vertically connected to the end face of the rotating disk 221. By the telescopic movement of the telescopic rod 32, the mounting base 31 can be moved away from or close to the end face of the rotating disk 221. A through hole is provided at the center of the mounting base 31. The detection end of the air pressure detection component 4 is axially inserted into the through hole and installed on the end face of the mounting base 31. Then, when the mounting base 31 moves away from or close to the end face of the rotating disk 221, the detection end of the air pressure detection component 4 can be axially inserted into the second exhaust hole 223 and the first exhaust hole 213 in sequence, so as to extend into the interior of the pipe to realize the real-time measurement of the air pressure inside the pipe. During actual use, by observing the air pressure value of the air pressure detection component 4, and then adjusting the aperture of the first exhaust hole 213 in real time according to the air pressure value, the balance adjustment of the air flow inside the pipe can be realized, so as to reduce the air pressure fluctuation generated during welding and affect the welding quality.

[0043] Preferably, as Figure 10 shown, meshing teeth 5 arranged evenly can be provided on the circumferential side of the rotating disk 221. A transmission rod 6 that makes a circular motion driven by a driving component 7 is provided on one side of the rotating disk 221. The circumferential side of the transmission rod 6 meshes with the meshing teeth 5 to form a worm and worm gear mechanism to drive the rotating disk 221 to rotate. In this embodiment, the driving component 7 is a motor, which is connected to a microcontroller 8, that is: a single-chip microcomputer; at the same time, the air pressure detection component 4 is connected to the microcontroller 8. Through the microcontroller 8, the automatic rotation of the rotating disk 221 can be realized, improving the convenience; at the same time, the microcontroller 8 can set the air pressure threshold required for welding. By comparing the air pressure data detected in real time by the air pressure detection component 4 with the set air pressure threshold, if the value measured by the air pressure detection component 4 is greater than the air pressure threshold, the microcontroller 8 controls the driving component 7 to operate. The driving component 7 drives the transmission rod 6 to rotate, and through the meshing of the transmission rod 6 and the meshing teeth 5, the rotating disk 221 rotates to drive the movable block 231 to move radially, so as to increase the aperture of the first exhaust hole 213 and increase the discharge amount of argon, so as to reduce the air pressure inside the pipe to within the set air pressure threshold; similarly, if the value measured by the air pressure detection component 4 is less than the air pressure threshold, the rotating disk 221 rotates in reverse, and the tips of the movable block 231 gradually converge and approach each other to reduce the aperture of the first exhaust hole 213 and reduce the discharge amount of argon, so as to increase the air pressure inside the pipe to within the set air pressure threshold, so as to realize the automatic dynamic balance adjustment of the air flow inside the pipe, so as to reduce the air pressure fluctuation generated during welding and affect the welding quality.

[0044] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A pipe welding and sealing protection device, characterized in that, Comprising: A sealing assembly (1), connected to an argon gas supply device, for sealing one end of a pipe and filling argon gas into the pipe through the argon gas supply device; A gas pressure regulation assembly (2), including a positioning portion (21) sealingly connected to the other end of the pipe, a first exhaust hole (213) opened at the center of the positioning portion (21) and communicating the inside and outside of the pipe, and a movable portion (23) movably provided at the end of the positioning portion (21) for adjusting the aperture size of the first exhaust hole (213); A gas pressure detection member (4), located at one end of the gas pressure regulation assembly (2), and its detection end can movably extend into the first exhaust hole (213) to detect the gas pressure value inside the pipe.

2. The pipe welding and sealing protection device according to claim 1, characterized in that: It further includes a telescopic assembly (3) connected between the gas pressure regulation assembly (2) and the gas pressure detection member (4). The telescopic assembly (3) is used for axially positioning the gas pressure detection member (4) and can drive the gas pressure detection member (4) to move axially along the first exhaust hole (213) under an external force, so that the detection end of the gas pressure detection member (4) extends into or out of the first exhaust hole (213).

3. The pipe welding and sealing protection device according to claim 1, characterized in that: The sealing assembly (1) includes an inflation and expansion member (11), an air valve (12) provided on the surface of the inflation and expansion member (11), and a gas filling pipe (13) sealingly penetrating the inflation and expansion member (11).

4. The pipe welding and sealing protection device according to claim 1, characterized in that: The gas pressure regulation assembly (2) further includes an adjustment portion (22) rotatably connected to the end of the positioning portion (21); The movable portion (23) is connected between the positioning portion (21) and the adjustment portion (22) and moves by the rotation of the adjustment portion (22).

5. The pipe welding and sealing protection device according to claim 4, wherein: The positioning portion (21) includes a positioning disc (211), an elastic connecting member (212) axially connected to the positioning disc (211), and a sliding groove (214) opened on the end face of the positioning disc (211) facing away from the elastic connecting member (212).

6. The pipe welding and sealing protection device according to claim 5, characterized in that: The adjustment portion (22) includes a rotating disc (221) axially rotatably connected to the end of the positioning disc (211), a plurality of guiding holes (222) radially opened on the surface of the rotating disc (221) and arranged annularly along the axis of the rotating disc (221), and a second exhaust hole (223) axially opened on the surface of the rotating disc (221).

7. The pipe welding and sealing protection device according to claim 6, characterized in that: The movable portion (23) includes a plurality of movable blocks (231) arranged annularly along the axis of the first exhaust hole (213), guiding columns (232) connected to the surfaces of the movable blocks (231) and slidably connected in the sliding groove (214), and sliders (233) connected to the surfaces of the movable blocks (231) and slidably connected in the guiding holes (222).

8. The pipe welding and sealing protection device according to claim 2, characterized in that: The telescopic assembly (3) includes an axially arranged mounting seat (31), and a telescopic rod (32) vertically connected to the end face of the mounting seat (31).

9. The pipe welding and sealing protection device according to claim 8, characterized in that: A through hole is opened at the center of the mounting seat (see Fig. 3), and the detection end of the gas pressure detection member (4) is axially inserted into the through hole and installed on the end face of the mounting seat (31).

10. The pipe welding and sealing protection device according to claim 7, characterized in that: The circumferential side of the rotating disk (221) is provided with uniformly arranged meshing teeth (5). On one side of the rotating disk (221), there is a transmission rod (6) that is driven by a driving member (7) to perform circular motion. The circumferential side of the transmission rod (6) meshes with the meshing teeth (5) to drive the rotation of the rotating disk (221).

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