CN210188792U - Gas protection device for pipeline welding - Google Patents
Gas protection device for pipeline welding Download PDFInfo
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- CN210188792U CN210188792U CN201921095110.5U CN201921095110U CN210188792U CN 210188792 U CN210188792 U CN 210188792U CN 201921095110 U CN201921095110 U CN 201921095110U CN 210188792 U CN210188792 U CN 210188792U
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Abstract
The utility model belongs to the technical field of the welding auxiliary assembly, specific saying relates to a pipeline welded gas protection device, is particularly useful for heavy-calibre pipeline mouth of pipe electric arc welding. The main technical scheme is as follows: including being located the first gasbag and the second gasbag that are used for the shutoff pipeline of mouth of pipe welding both sides respectively, first gasbag and second gasbag are inside to have a perfect understanding connecting pipe, the outside portion of first gasbag set up with the main vent that link up the connecting pipe and connect, it is in to link up the connecting pipe set up one or more gas pocket on first gasbag, second gasbag and the body that is located the weld zone between the two, run through first gasbag and/or second gasbag set up backflow pipeline, backflow pipeline intercommunication welding area and pipeline are inboard. The device has the characteristics of realizing the cooling of the air bag by the circulating flow of the welding protective gas, ensuring the uniform and stable concentration of the protective gas in the welding area and tightly plugging two sides of the welding seam of the pipe orifice.
Description
Technical Field
The utility model belongs to the technical field of the welding auxiliary assembly, specific saying relates to a pipeline welded gas protection device, is particularly useful for heavy-calibre pipeline mouth of pipe electric arc welding.
Background
Gas shielded welding is an arc welding method in which a metal droplet, a welding pool and high-temperature metal at a welding zone are protected from the action of air by using gas, and commonly used shielding gases include inert gases (such as argon and helium), reducing gases (such as hydrogen and nitrogen), and oxidizing gases (such as carbon dioxide) which form a local gas protective layer around an arc during welding to prevent the invasion of gas harmful to the droplet and the welding pool and ensure the stability of the welding process. When a pipeline is welded, blocking devices are preferably arranged on two sides of a welding seam of a pipe orifice, a sealed welding area is formed in the pipeline, and then welding protective gas is filled into the welding area; secondly, high temperature is generated during electric arc welding, the air bag and the communicating pipeline are seriously damaged, and the service life of the plugging device is obviously shortened.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a realize that welding protective gas circulation flows the tight pipeline welded gas protection device of both sides shutoff of even stability and mouth of pipe welding seam of gasbag cooling, welding area's protective gas concentration.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a pipeline welded gas protection device, is including being fixed in first gasbag and the second gasbag in the pipeline of welding mouth of pipe both sides respectively, first gasbag and the inside link up connecting pipe that is provided with of second gasbag, the outside portion of first gasbag set up with link up the main vent hole that the connecting pipe is connected, link up the connecting pipe and be in set up one or more gas pocket in first gasbag, the second gasbag and be located the connecting pipe body between the two, run through first gasbag and/or second gasbag set up backflow pipeline, backflow pipeline intercommunication welding area and pipeline are inboard.
The additional technical characteristics of the gas protection device for pipeline welding further comprise:
-the through connection pipe is provided with a first air hole on the pipe body in the welding area
The overpressure relief mechanism is used for relieving the relief pressure of the first overpressure relief mechanism to be more than or equal to the blocking pressure in the first air bag and the second air bag;
-providing a supplementary vent conduit through the first and/or second bladder, the supplementary vent conduit communicating the welding area and the conduit interior side;
a first auxiliary vent pipe communicated with the first air bag and a second auxiliary vent pipe communicated with the second air bag are arranged in the welding area, pipe orifices of the first auxiliary vent pipe and the second auxiliary vent pipe in the welding area are respectively provided with a second overpressure relief mechanism and a third overpressure relief mechanism, and the relief pressure of the second overpressure relief mechanism and the relief pressure of the third overpressure relief mechanism are consistent with the relief pressure of the first overpressure relief mechanism;
the through connecting pipe is provided with a first flow regulating valve on the pipe body of the first air bag, the pipe opening of the supplementary vent pipe on the inner side of the pipe is provided with a second flow regulating valve, the pipe opening of the return pipe on the inner side of the pipe is provided with a gas concentration detector, and the first flow regulating valve, the second flow regulating valve and the gas concentration detector are all connected with a PLC (programmable logic controller);
-providing a vent hole in the outer side of the second bladder;
the first air bag, the second air bag and the through connecting pipe are all made of high-temperature resistant materials.
A pull ring is arranged on the outer side of the first air bag and/or the second air bag and used for pulling out the first air bag and/or the second air bag from the inner side of the pipeline after the first air bag and/or the second air bag is deflated.
The utility model provides a pipeline welded gas protection device compares with prior art, has following advantage: firstly, as the first air bag and/or the second air bag of the gas protection device welded by the pipeline are/is provided with the backflow pipeline which is communicated with the welding area and the inner side of the pipeline, after the first air bag and the second air bag are inflated to form plugging, the inflation in the welding area and the backflow exhaust in the backflow pipeline are carried out simultaneously, the protective gas can carry out welding high temperature in a circulating flow manner, and the air bags are cooled; secondly, as the through connecting pipe is provided with the first overpressure relieving mechanism on the air hole on the pipe body in the welding area, the relieving pressure of the first overpressure relieving mechanism is more than or equal to the blocking pressure in the first air bag and the second air bag, namely, the welding area is inflated on the premise of finishing tight blocking of two sides of the welding seam, the loss of protective gas is reduced, and meanwhile, the concentration of the welding gas at the welding seam is ensured to be stable; thirdly, because the through connection pipe sets up first flow control valve on the body of first gasbag, it sets up the second flow control valve to supply the mouth of pipe of air duct at the pipeline inboard, return line sets up the gas concentration detector at the mouth of pipe of pipeline inboard, first flow control valve, second flow control valve and gas concentration detector all are connected with the PLC controller, the real time monitoring to the regional protective gas concentration of welding has been realized, automatic control supplies the air duct and carries out the quick inflation operation, ensure that the protective gas concentration of welding seam department does not receive the external pressure influence, remain stable even all the time.
Drawings
Fig. 1 is a schematic structural view of a gas protection device for pipeline welding according to the present invention.
Detailed Description
The structure and the working principle of the gas protection device for pipeline welding according to the present invention will be further described in detail with reference to the accompanying drawings.
Referring to fig. 1, the structure of the gas protection device for pipeline welding according to the present invention is schematically illustrated. The structure of the pipeline welding gas protection device mainly comprises a first air bag 11 and a second air bag 12 which are respectively positioned at two sides of a pipe orifice welding seam A and used for blocking a pipeline, a through connecting pipe 2 is arranged in the first air bag 11 and the second air bag 12, a main vent 3 connected with the through connecting pipe 2 is arranged at the outer side part of the first air bag 11, one or more air holes (41, 42 and 43) are arranged on pipe bodies (22 and 23) in the first air bag 11 and the second air bag 12 and on the pipe body positioned in a welding area B between the first air bag and the second air bag by the through connecting pipe 2, a backflow pipeline 5 is arranged through the first air bag 11 and/or the second air bag 12, and the backflow pipeline 5 is communicated with the welding area B and the inner side C1 of the pipeline.
The working principle is as follows: a first air bag 11 and a second air bag 12 of the device are respectively arranged in pipelines at two sides of a pipe orifice welding seam A, a main vent 3 at the outer side part of the first air bag 11 is communicated with an air bottle, protective gas is filled into the first air bag 11 and the second air bag 12 through air holes (41 and 43) which penetrate through a pipe body of a connecting pipe 2 to finish the plugging of two sides of the pipe orifice welding seam A, meanwhile, the air holes 42 on the tube body 21 in the welding area B are inflated to form welding protection, since the return duct 5 is provided through the first airbag 11 and/or the second airbag 12, the return duct 5 communicates the soldering region B and the duct inner side C1, therefore, the protective gas at the welding seam is in a flowing state, the temperature of the contact surfaces of the first air bag 11 and the second air bag 12 and the welding area B is reduced, the first air bag 11, the second air bag 12, the through connecting pipe 2 and other equipment are protected, and the service life of the device is prolonged.
In the structure constituting the above-described pipe welding gas protection apparatus,
in order to quickly form an effective seal in the welding zone B, the through-connection 2 is in place
Arranging a first overpressure relieving mechanism 61 on the air hole 42 of the pipe body 21 in the welding area B, wherein the relieving pressure of the first overpressure relieving mechanism 61 is greater than or equal to the blocking pressure in the first air bag 11 and the second air bag 12, namely, when the main vent 3 is used for inflating, the first air bag 11 and the second air bag 12 are inflated preferentially, after the first overpressure relieving mechanism 61 of the air hole 42 on the pipe body 21 in the welding area B is opened after the first overpressure relieving mechanism reaches the tight blocking pressure, and the welding area B is filled with the protective gas, so that sequential inflation is formed, the utilization efficiency of the protective gas is improved, and the gas source is saved;
the first overpressure release mechanism 61 may be a valve body such as a conventional safety valve or an exhaust valve;
the supplementary vent pipe 7 is arranged to penetrate through the first air bag 11 and/or the second air bag 12, the supplementary vent pipe 7 is communicated with the welding area B and the inner side C1 of the pipe, and the supplementary vent pipe 7 can accelerate the flowing speed of the protective gas and rapidly improve the gas concentration of the welding area B;
in order to save the usage amount of welding protection gas, a first auxiliary ventilation pipeline 81 communicated with the first air bag 11 and a second auxiliary ventilation pipeline 82 communicated with the second air bag 12 are arranged in the welding area B, the pipe mouths of the first auxiliary ventilation pipeline 81 and the second auxiliary ventilation pipeline 82 in the welding area B are respectively provided with a second overpressure relieving mechanism 62 and a third overpressure relieving mechanism 63, the relieving pressure of the second overpressure relieving mechanism 62 and the third overpressure relieving mechanism 63 is consistent with the relieving pressure of the first overpressure relieving mechanism 61, after the first air bag 11 and the second air bag 12 are inflated to reach the plugging pressure, the first auxiliary vent pipeline 81, the second auxiliary vent pipeline 82 and the air hole 42 which penetrates through the pipe body 21 of the connecting pipe 2 inflate the welding area B at the same time, the concentration of welding protective gas is quickly reached, and gas internal and external circulation is formed through the backflow pipeline 5;
after the welding protection gas pressure is in a flowing state, in order to improve the stability of the gas pressure in the first gas bag 11, the second gas bag 12 and the welding area B, the through connection pipe 2 is provided with a first flow rate adjustment valve 91 at the pipe body of the first air bag 11, a second flow rate adjustment valve 92 at the pipe orifice of the pipe inner side C1 of the supplementary air duct 7, a gas concentration detector 93 at the pipe orifice of the pipe inner side C1 of the return duct 5, the first flow rate adjustment valve 91, the second flow rate adjustment valve 92 and the gas concentration detector 93 are all connected with the PLC 9, namely, the gas concentration detector 93 monitors the gas concentration change in the welding area B in real time, and feeds back the signal to the PLC controller 9, and the PLC controller 9 sends the regulating signal of the inflation flow to the first flow regulating valve 91 and the second flow regulating valve 92, so that the process realizes automatic control, and the device has higher intelligence;
in a specific example, when a pipeline with the diameter of 20 inches is welded, the first air bag 11 and the second air bag 12 are placed at 400mm positions on two sides of a welding seam A of a pipe opening respectively, the flow rate of welding protective gas in the through connecting pipe 2 and the supplementary vent pipe 7 is kept at 24L/min during inflation, the standard concentration of the protective gas in a welding area B is quickly reached within 5 minutes, a stable flowing state is formed, the air pressure is kept at 0.015Mp, sealing is tight, and welding work is smoothly performed.
In order to avoid forming a vortex in the welding area B when the shielding gas flows rapidly and continuously, which causes that the mixed gas generated by welding and before plugging cannot be completely discharged, the exhaust hole 44 is arranged on the outer side of the second airbag 12, and the exhaust hole 44 ensures the smooth movement of the gas flow;
for the purpose of enhancing the durability of the equipment unit, the first air bag 11, the second air bag 12 and
the through connecting pipe is made of high-temperature resistant materials, and the high-temperature resistant materials comprise fireproof cloth, high-temperature resistant metal hoses or heat-resistant rubber and the like;
the pull ring 10 is arranged on the outer side of the first air bag 11 and/or the second air bag 12 and used for pulling out an air bag and/or the second air bag 12 from the inner side C2 of the pipeline after air leakage, air is exhausted from the air bag and is decompressed after welding is finished, the whole device can be pulled out from the pipeline by connecting the pull ring 10 arranged on the outer side of the first air bag 11 and/or the second air bag 12 through the pull rod or the pull rope, labor and time are saved when the device is detached, and a quick exhaust valve 94 can be additionally arranged outside the main air vent 3 for quick exhaust and decompression, so that the working efficiency is improved.
Claims (8)
1. A gas protection device for pipeline welding is characterized in that: including first gasbag and the second gasbag that can be fixed in respectively in the pipeline of welding mouth of pipe both sides, first gasbag and the inside link up connecting pipe that is provided with of second gasbag, the outside portion of first gasbag set up with link up the main blow vent that the connecting pipe is connected, it is in to link up the connecting pipe set up one or more gas pocket in first gasbag, the second gasbag and on being located the connecting pipe body between the two, run through first gasbag and/or second gasbag set up backflow pipeline, backflow pipeline intercommunication welding area territory and pipeline are inboard.
2. The gas-shielding apparatus for welding pipes according to claim 1, wherein: and a first overpressure diffusing mechanism is arranged on an air hole in the pipe body positioned in the welding area of the through connecting pipe, and the diffusing pressure of the first overpressure diffusing mechanism is greater than or equal to the blocking pressure in the first air bag and the second air bag.
3. A gas-protecting apparatus for pipe welding according to claim 1 or 2, wherein: a supplemental vent conduit is provided through the first and/or second bladders, the supplemental vent conduit communicating between the weld region and a conduit interior side.
4. A gas-protecting apparatus for pipe welding according to claim 1 or 2, wherein: and a first auxiliary vent pipeline communicated with the first air bag and a second auxiliary vent pipeline communicated with the second air bag are arranged in the welding area, pipe orifices of the first auxiliary vent pipeline and the second auxiliary vent pipeline in the welding area are respectively provided with a second overpressure release mechanism and a third overpressure release mechanism, and the release pressure of the second overpressure release mechanism and the third overpressure release mechanism is consistent with the release pressure of the first overpressure release mechanism.
5. The gas-shielding apparatus for welding pipes according to claim 3, wherein: the through connecting pipe is provided with a first flow regulating valve on the pipe body of the first air bag, the pipe orifice of the inner side of the pipe of the supplementary vent pipe is provided with a second flow regulating valve, the pipe orifice of the inner side of the pipe of the return pipe is provided with a gas concentration detector, and the first flow regulating valve, the second flow regulating valve and the gas concentration detector are all connected with a PLC (programmable logic controller).
6. The gas-shielding apparatus for welding pipes according to claim 1, wherein: and a vent hole is arranged on the outer side of the second air bag.
7. A gas-shielding device for welding pipes according to claim 1, 2 or 5, wherein: the first air bag, the second air bag and the through connecting pipe are all made of high-temperature resistant materials.
8. The gas-shielding apparatus for welding pipes according to claim 1, wherein: and a pull ring is arranged on the outer side of the first air bag and/or the second air bag and is used for pulling out the first air bag and/or the second air bag from the inner side of the pipeline after the first air bag and/or the second air bag deflates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921095110.5U CN210188792U (en) | 2019-07-14 | 2019-07-14 | Gas protection device for pipeline welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921095110.5U CN210188792U (en) | 2019-07-14 | 2019-07-14 | Gas protection device for pipeline welding |
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| Publication Number | Publication Date |
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| CN210188792U true CN210188792U (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921095110.5U Active CN210188792U (en) | 2019-07-14 | 2019-07-14 | Gas protection device for pipeline welding |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605505A (en) * | 2020-11-30 | 2021-04-06 | 成都飞机工业（集团）有限责任公司 | Welding gas protection and air pressure regulation and control device for inner wall of pipe |
| CN112705827A (en) * | 2020-12-31 | 2021-04-27 | 江苏核电有限公司 | Stainless steel pipeline welding argon filling device and method |
-
2019
- 2019-07-14 CN CN201921095110.5U patent/CN210188792U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112605505A (en) * | 2020-11-30 | 2021-04-06 | 成都飞机工业（集团）有限责任公司 | Welding gas protection and air pressure regulation and control device for inner wall of pipe |
| CN112705827A (en) * | 2020-12-31 | 2021-04-27 | 江苏核电有限公司 | Stainless steel pipeline welding argon filling device and method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200602 Address after: 053500 Guo Long Zhuang, Wencheng Township, Jing County, Hengshui City, Hebei Province Patentee after: Hebei yueqiheng rubber and plastic products Co., Ltd Address before: Fan Wencheng village, Wencheng Town, Jingxian County, Hengshui City, Hebei Province Patentee before: Wang Zhengfu |