CN104353577B - Spray gun for repairing mouth in pipeline and construction method - Google Patents
Spray gun for repairing mouth in pipeline and construction method Download PDFInfo
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- CN104353577B CN104353577B CN201410640476.1A CN201410640476A CN104353577B CN 104353577 B CN104353577 B CN 104353577B CN 201410640476 A CN201410640476 A CN 201410640476A CN 104353577 B CN104353577 B CN 104353577B
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- spray
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- 239000007921 spray Substances 0.000 title claims abstract description 77
- 238000010276 construction Methods 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 238000005507 spraying Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 7
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 abstract description 30
- 238000000576 coating method Methods 0.000 abstract description 30
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000012407 engineering method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
Abstract
The invention discloses a spray gun for repairing a mouth in a pipeline, which comprises a gun barrel with the diameter of 10-20mm and a spray head, wherein the front end of the gun barrel is communicated with the spray head, a plurality of spray holes with the diameter of 0.25-0.35mm are formed in the spray head, a feed inlet is formed in the tail end of the gun barrel, and the feed inlet is connected with a feed pipe; the gun barrel comprises a high-pressure gas channel and a feeding distribution plate, the diameter of the high-pressure gas channel is smaller than the radius of the gun barrel, the high-pressure gas channel is arranged in the middle of the gun barrel, and the feeding distribution plate is arranged at the tail of the gun barrel; the outlet of the high-pressure gas channel is connected with an air inlet pipe, and a control valve is arranged on the air inlet pipe. Meanwhile, the invention also provides a construction method for the inner repaired mouth. The spray gun disclosed by the invention is simple in structure, the construction method is simple and convenient to operate, the operation cost is low, the efficiency is high, the coating quality is good, the construction operation of the inner repaired mouth of the pipeline with the DN50 can be realized, the construction problem of the inner repaired mouth of the pipeline is successfully solved, and a mature construction method of the inner repaired mouth is formed.
Description
Technical field
The invention belongs to pipeline internal joint patch corrosion-inhibiting coating spraying technology field, be specifically related to a kind of for pipeline internal joint patch antiseptical spray gun and construction method thereof.
Background technology
Steel pipe plays very important effect in pipeline carries, but the etching problem of steel pipe affects the service life of steel pipe always.It is coated with anticorrosive powder in steel pipe corrosion-proof is typically all at present to complete, but for long distance delivery pipeline, needs to carry out steel pipe aligning at the scene and be welded into long lines.When pipeline construction is welded, general pipe end is reserved 50mm width and is not made corrosion-inhibiting coating, or near weld seam, the corrosion-inhibiting coating (the most all kinds of organic resin material coating) of inwall circumferencial direction will be burned out during welding, after so pipeline is constructed and put into operation, serious Corrosion Potential will be buried near weld seam, reducing pipeline service life, be even in operation generation security incident, environmental pollution.Therefore, after pipeline welding completes, require supplementation with together at the operation of weld bond inwall again anticorrosive coating, referred to as internal joint patch.
For heavy-caliber pipeline, the common jointing method of postwelding internal joint patch is the method using remote operated vehicle or artificial in-line portion to mend brush applied coating, brush applied coating mended by artificial hairbrush, labor strength is big, and work efficiency is low, and repaired mouth quality is uneven, and remote operated vehicle repaired mouth equipment manufacturing cost is high, investment is big, and structural repair is complicated, and cost is high.And for the dead mouth joint of large diameter pipeline, the internal joint patch that there is no maturation processes technique and method.For small-bore pipeline, because caliber is little, dolly or manually cannot stretch into close to weld seam, therefore substantially do not carry out internal joint patch process without feasible construction method.
Summary of the invention
The purpose of the present invention is that for above-mentioned the deficiencies in the prior art, it is provided that a kind of simple in construction, easy and simple to handle, can realize carrying out pipeline internal joint patch spray gun and the construction method of anti-corrosion spray.
To achieve these goals, the invention provides a kind of pipeline internal joint patch spray gun, it includes gun barrel and the shower nozzle of a diameter of 10-20mm, gun barrel front end connection shower nozzle, having the spray orifice of several diameter 0.25-0.35mm on shower nozzle, gun barrel tail end has charging aperture, and charging aperture connects feed pipe；Described gun barrel includes gases at high pressure passage and feed distributing plate, and the diameter of gases at high pressure passage is less than the radius of gun barrel, and gases at high pressure passage is arranged in the middle part of gun barrel, and feed distributing plate is arranged on gun barrel afterbody；Gases at high pressure channel outlet connects air inlet pipe, and air inlet pipe arranges control valve；
The percent opening of described feed distributing plate is 60-70%, a diameter of 4-6mm of described feed pipe.
Further, described shower nozzle conically shaped, the conical surface and cone are provided with spray orifice, so can expand the spray area of shower nozzle, and shower nozzle is connected end and has circular arc protuberance with gun barrel, also the spray orifice of diameter 0.25-0.35mm is had, it is ensured that the inner-walls of duct top of adjacent shower nozzle also is able to be sprayed, it is achieved zero dead angle spraying of inner-walls of duct on circular arc protuberance.The vaporific coating that shower nozzle of the present invention ejects can form film in the range of inner-walls of duct 1200-1400mm, it is ensured that anticorrosive coat original with steel pipe walls realizes overlapping completely, forms seal coat.
Further, the percent opening of described shower nozzle is 40%～60%, and the percent opening of spray nozzle is 20%, improves the uniformity of shower nozzle spraying, improves film quality, the coating rate of guarantee inner-walls of duct.
Further, the cross sectional shape of described feed distributing plate is V-arrangement, it is easy to the uniformity of adjusting coating flowing, it is ensured that flowing velocity, it is ensured that atomizing effect.
Present invention also offers this internal joint patch spray gun construction method for pipeline internal joint patch, it includes following construction procedure simultaneously:
(1) by two steel pipe aligning welding, at the spray gun manhole appendix pipe of one Φ 15-25mm of butt weld welded top, described spray gun manhole appendix pipe disposed thread, the bottom of manhole appendix pipe flushes with steel pipe inner wall, and top exceeds steel pipe face 10-12mm；
(2) putting in anticorrosion storage device by the feed pipe of spray gun of the present invention, air inlet pipe is connected with high-pressure air feed device；
(3) during pistol afterbody is stretched into spray gun manhole appendix pipe, it is ensured that the placement location of anticorrosion storage device is higher than spray gun operation height, opens high-pressure air feed device, opens the control valve in air inlet pipe and carry out the spraying of anticorrosive paint；
(4) after having sprayed, close control valve, high-pressure air feed device, take out spray gun, close spray gun manhole appendix pipe with bolt, complete internal joint patch.
Preferably, the pressure controlling high pressure gas in described high-pressure air feed device is 10-15MPa.
Described high-pressure air feed device is High Pressure Air Compressor or high pressure gas holder.
In order to improve compactness and the uniformity of anticorrosive coating film, installing drainage screen in described step (2) in anticorrosion storage device, feed pipe is placed in drainage screen, and the anticorrosive paint so entering feed pipe has filtered out impurity, and coating particle size is more uniform.
Further, before described step (4) closes spray gun manhole appendix pipe with bolt, the screw thread of spray gun manhole appendix pipe smears antirust preservative oil, bolt is wound around anticorrosion adhesive tape, improves the anti-rust and corrosionproperties of spray gun manhole appendix pipeline.
During when the present invention operates, anticorrosion storage device put into by spray gun feed pipe, ensure that the placement location of anticorrosion storage device is higher than spray gun operation height, so when being passed through gases at high pressure in spray gun gases at high pressure passage, effect due to atmospheric pressure, anticorrosive paint in anticorrosion storage device is drawn in feed pipe, and the coating in feed pipe is in charging aperture flows to gun barrel.Due to the aft mounted feed distributing plate of gun barrel, control the flowing velocity of coating, when coating flows from gun barrel afterbody forward end, gradually mix turbulent flow with the gases at high pressure being passed through in gases at high pressure passage, final atomized in gun barrel front end, the coating of spray pattern has sprayed anticorrosion coating through shower nozzle.The present invention, by controlling the diameter of feed pipe, the percent opening of feed distributing plate and the diameter of gases at high pressure passage, makes the coating through gun barrel atomized.
Spray gun diameter of the present invention is only 10-20mm, only need to weld the spray gun manhole appendix pipe of a Φ 15-25mm when butt welding of pipelines in welded joints, just can stretch into coating from this hole pipe, it is to avoid open the damage that pipeline is caused by bigger hole on pipeline；Shower nozzle is connected end and arranges circular arc protuberance with gun barrel so that the direction of coating ejection is multidirectional, and the inner-walls of duct top of adjacent shower nozzle can also coat coating, it is achieved zero dead angle coating coating.
Compared with prior art, it is an advantage of the current invention that:
(1) the inventive method construction is simple, easily operates, and film quality is good, can realize the construction operation of all more than DN50 pipeline internal joint patch, successfully solve the construction difficult problem of pipeline internal joint patch, define the ripe engineering method of internal joint patch.
(2) spray range of the present invention reaches 1200 1400mm, can guarantee that and overlaps completely with original anticorrosive coat, forms seal coat, and uses high pressure painting, and coating adhesion is high, and film is fine and close, uniform, and quality is good.
(3) spray gun structure of the present invention is simple, and easy and simple to handle, operating cost is low, and efficiency is high.
(4) present invention construction is not limited by place, and all places that can carry out Pipe installing welding all can carry out construction operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of spray gun of the present invention；
Fig. 2 is spray gun internal joint patch construction method schematic diagram of the present invention.
Marginal data:
1, gun barrel；2, shower nozzle；3, spray orifice；4, protuberance；5, gases at high pressure passage；6, air inlet pipe；7, control valve；8, feed distributing plate；9, charging aperture；10；Feed pipe；11, anticorrosion storage device；12, drainage screen；13, high-pressure air feed device；14, spray gun manhole appendix pipe；15, steel pipe；16, nozzle.
Detailed description of the invention
In order to be more clearly understood from the purpose of the present invention, technical scheme and beneficial effect, the present invention is described further below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited in the examples below.
See Fig. 1, a kind of pipeline internal joint patch spray gun that the present invention provides, it includes gun barrel 1 and the shower nozzle 2 of a diameter of 10-20mm, gun barrel 1 front end connection shower nozzle 2, having the spray orifice 3 of several diameter 0.25-0.35mm on shower nozzle 2, gun barrel 1 tail end has charging aperture 9, and charging aperture 9 connects feed pipe 10；Described gun barrel 1 includes gases at high pressure passage 5 and feed distributing plate 8, the diameter of gases at high pressure passage 5 is slightly less than the radius of gun barrel 1, gases at high pressure passage 5 is arranged in the middle part of gun barrel 1, feed distributing plate 8 is arranged on gun barrel 1 afterbody, the percent opening of feed distributing plate 8 is 60 70%, a diameter of 4-6mm of feed pipe 10, it is ensured that gas can mix turbulent flow with coating, makes coating be atomized；Gases at high pressure passage 5 outlet connects air inlet pipe 6, and air inlet pipe 6 arranges control valve 7, controls the closedown of gases at high pressure.
Further, described shower nozzle 2 conically shaped, the conical surface and cone are provided with spray orifice 3, so can expand the spray area of shower nozzle, and shower nozzle 2 is connected end and has circular arc protuberance 4 with gun barrel 1, also the spray orifice 3 of diameter 0.25-0.35mm is had, it is ensured that the inner-walls of duct top of adjacent shower nozzle also is able to be sprayed, it is achieved zero dead angle spraying of inner-walls of duct on circular arc protuberance 4.The vaporific coating that shower nozzle of the present invention ejects can form film in the range of inner-walls of duct 1200-1400mm, it is ensured that anticorrosive coat original with steel pipe walls realizes overlapping completely, forms seal coat.
Further, the percent opening of described shower nozzle 2 is 40%～60%, and the percent opening of spray nozzle 16 is 20%, improves the uniformity of shower nozzle spraying, improves film quality, the coating rate of guarantee inner-walls of duct.
Further, the cross sectional shape of described feed distributing plate 8 is V-arrangement, it is easy to the uniformity of adjusting coating flowing, it is ensured that flowing velocity, it is ensured that atomizing effect.
Spray gun of the present invention carries out the construction method of pipeline internal joint patch and sees Fig. 2, is described in detail below as a example by DN400 pipeline:
1, by two DN400 steel pipe 15 butt weldings, at the spray gun manhole appendix pipe 14 of one Φ 20mm of butt weld welded top, described spray gun manhole appendix pipe 14 disposed thread, the bottom of manhole appendix pipe 14 flushes with steel pipe 15 inwall, and top exceeds steel pipe 15 pipe face 10-12mm；
2, selected anticorrosive paint is poured in anticorrosion storage device 11, the drainage screen 12 of 100 mesh is installed in anticorrosion storage device 11, the feed pipe 10 being connected with spray gun (gun barrel diameter 18mm) charging aperture is placed in drainage screen 12；
3, the air inlet pipe 6 of spray gun is connected with high-pressure air feed device 13；The preferred High Pressure Air Compressor of high-pressure air feed device 13 or high pressure gas holder；
4, during pistol afterbody is stretched into spray gun manhole appendix pipe 14, it is ensured that the placement location of anticorrosion storage device 11 is higher than spray gun operation height, opens high-pressure air feed device 13, opens the control valve 7 in air inlet pipe 6 and carry out the spraying of anticorrosive paint；
5, after having sprayed, close control valve 7, high-pressure air feed device 13, take out spray gun, the screw thread of spray gun manhole appendix pipe 14 is smeared antirust preservative oil, after being then wound around bolt with anticorrosion adhesive tape, bolt is tightened closing spray gun manhole appendix pipe, completes internal joint patch.
It should be noted that in above-mentioned spraying operation, control the high pressure gas pressure of high-pressure air feed device between 10-15MPa.
Spray gun enters pipeline depth to ensure that shower nozzle fully enters upper inner-walls of duct.
During spraying operation, should circumferentially do suitable swing by spray gun interstice coverage in manhole appendix, to ensure that internal joint patch scope is all covered by paint film.
Empirical tests, the inventive method and spray gun can realize the construction operation of all more than DN50 pipeline internal joint patch, and construction method is simple, do not limited by place, all places that can carry out Pipe installing welding all can carry out construction operation, the most successfully solve the construction difficult problem of pipeline internal joint patch, define the ripe engineering method of internal joint patch.
Claims (10)
1. a pipeline internal joint patch spray gun, it is characterised in that: including gun barrel and the shower nozzle of a diameter of 10-20mm, gun barrel front end connection shower nozzle, shower nozzle has the spray orifice of several diameter 0.25-0.35mm, gun barrel tail end has charging aperture, and charging aperture connects feed pipe；Described gun barrel includes gases at high pressure passage and feed distributing plate, and the diameter of gases at high pressure passage is less than the radius of gun barrel, and gases at high pressure passage is arranged in the middle part of gun barrel, and feed distributing plate is arranged on gun barrel afterbody；Gases at high pressure channel outlet connects air inlet pipe, and air inlet pipe arranges control valve；The percent opening of described feed distributing plate is 60-70%, a diameter of the 4 of described feed pipe～6mm.
A kind of pipeline internal joint patch spray gun the most according to claim 1, it is characterised in that: described shower nozzle conically shaped, shower nozzle is connected end with gun barrel circular arc protuberance, and circular arc protuberance has the spray orifice of diameter 0.25-0.35mm.
A kind of pipeline internal joint patch spray gun the most according to claim 1, it is characterised in that: the percent opening of described shower nozzle is 40%～60%.
A kind of pipeline internal joint patch spray gun the most according to claim 3, it is characterised in that: the percent opening of described spray nozzle is 20%.
A kind of pipeline internal joint patch spray gun the most according to claim 1, it is characterised in that: the cross sectional shape of described feed distributing plate is V-arrangement.
6. use the method that the pipeline internal joint patch spray gun according to any one of claim 1 to 5 carries out internal joint patch construction, it is characterised in that: comprise the following steps:
(1) by two steel pipe aligning welding, at the spray gun manhole appendix pipe of one Φ 15-25mm of butt weld welded top, described spray gun manhole appendix pipe disposed thread, the bottom of manhole appendix pipe flushes with steel pipe inner wall, and top exceeds steel pipe face 10-12mm；
(2) putting in anticorrosion storage device by the feed pipe of spray gun, air inlet pipe is connected with high-pressure air feed device；
(3) during pistol afterbody is stretched into spray gun manhole appendix pipe, it is ensured that the placement location of anticorrosion storage device is higher than spray gun operation height, opens high-pressure air feed device, opens the control valve in air inlet pipe and carry out the spraying of anticorrosive paint；
(4) after having sprayed, close control valve, high-pressure air feed device, take out spray gun, close spray gun manhole appendix pipe with bolt, complete internal joint patch.
Method the most according to claim 6, it is characterised in that: the pressure controlling high pressure gas in described high-pressure air feed device is 10-15MPa.
8. according to the method described in claim 6 or 7, it is characterised in that: described high-pressure air feed device is High Pressure Air Compressor or high pressure gas holder.
Method the most according to claim 6, it is characterised in that: installing drainage screen in described step (2) in anticorrosion storage device, feed pipe is placed in drainage screen.
Method the most according to claim 6, it is characterised in that: before described step (4) closes spray gun manhole appendix pipe with bolt, the screw thread of spray gun manhole appendix pipe smears antirust preservative oil, bolt is wound around anticorrosion adhesive tape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410640476.1A CN104353577B (en) | 2014-11-14 | Spray gun for repairing mouth in pipeline and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410640476.1A CN104353577B (en) | 2014-11-14 | Spray gun for repairing mouth in pipeline and construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104353577A CN104353577A (en) | 2015-02-18 |
| CN104353577B true CN104353577B (en) | 2017-01-04 |
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| PB01 | Publication | ||
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| CP01 | Change in the name or title of a patent holder |
Address after: 641000 Xinhua Road 249, Central District, Neijiang, Sichuan Patentee after: Sichuan southwest environmental protection technology anticorrosive Limited by Share Ltd Address before: 641000 Xinhua Road 249, Central District, Neijiang, Sichuan Patentee before: SICHUAN XINAN JIANAN CORROSION ENGINEERING CO., LTD. |