CN103542197B - The Coating Production Line of a kind of steel pipe corrosion-proof erosion and coated technique - Google Patents
The Coating Production Line of a kind of steel pipe corrosion-proof erosion and coated technique Download PDFInfo
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- CN103542197B CN103542197B CN201310483454.4A CN201310483454A CN103542197B CN 103542197 B CN103542197 B CN 103542197B CN 201310483454 A CN201310483454 A CN 201310483454A CN 103542197 B CN103542197 B CN 103542197B
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- steel pipe
- coating
- frequency heating
- heating device
- drive line
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1063—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sheet wrapped around the pipe
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/0207—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the work being an elongated body, e.g. wire or pipe
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to coating corrosion-resistant field, it is specifically related to Coating Production Line and the coated technique of the erosion of a kind of steel pipe corrosion-proof, including coating drive line, coating drive line is sequentially provided with steel pipe shot-blasting plant, the first frequency heating device, spray-painting plant, the second frequency heating device, epoxy powder spray application device, adhesive extruder, polyethylene (PE) extruder and water cooling system; Apply to the coated technique on this production line and specifically include that impeller blasting, heating in medium frequency, spraying, the step such as cooling, the present invention efficiently, environmental protection, safety, economy.
Description
Technical field
The invention belongs to coating corrosion-resistant field, be specifically related to Coating Production Line and the coated technique of the erosion of a kind of steel pipe corrosion-proof.
Background technology
Progressive in development and the epoch of basic industries, the exploitation of ocean is increasingly paid attention to by the mankind, bridge spanning the sea and the ocean Wharf Construction of various places are continuous, it is steel-pipe pile that design needs to use maximum, and require it is the whole steel-pipe pile made, such as Construction of Hangzhou Bay Cross-sea Bridge steel-pipe pile length nearly hundred meters, some particularly external tidal quaies, length and diameter are all develop towards long and big direction.
Owing to steel pipe needs long period of soaking in the sea, steel pipe is carried out long-term corrosion by sea water, the corrosivity of sea water is strong again, so, it is an important sport technique segment that steel pipe corrosion-proof is processed, and for the different application of steel pipe, need different preservative treatments, in view of this, be badly in need of one efficiently, environmental protection, safe, economic steel pipe Coating Production Line and the coating production technology mated with this production line, this case thus produces.
Summary of the invention
The first object of the present invention is to provide the Coating Production Line of a kind of steel pipe, concrete technical scheme is as follows: the Coating Production Line of a kind of steel pipe corrosion-proof erosion, including coating drive line, coating drive line is sequentially provided with steel pipe shot-blasting plant, the first frequency heating device, spray-painting plant, the second frequency heating device, epoxy powder spray application device, adhesive extruder, polyethylene (PE) extruder and water cooling system; Wherein, the side of described steel pipe shot-blasting plant is connected and installed with a cyclone separator; Described spray-painting plant side is connected and installed with a paint gas recovery system; Coating transmission line segment side between described spray-painting plant and the second frequency heating device is connected and installed with a coating transmission moving-out device; Described polyethylene (PE) extruder feed end is provided with a concentration feeding system; Coating transmission line segment after being positioned at described polyethylene (PE) extruder is provided with water cooling system; Being positioned on the latter end of described coating drive line and be provided with carrying inversion tube device, the steel pipe that this carrying inversion tube device can will be located on coating drive line is moved away from.
Arranging further, the end side of described coating drive line is provided with a pipe end grinding apparatus, and this grinding apparatus is installed on rectilinear orbit, and described pipe end grinding apparatus can along rectilinear orbit displacement back and forth.
Arranging further, the coating transmission line segment between described entrance the second frequency heating device and moving-out device is removable Coating Production Line.
Arranging further, the described steel pipe shot-blasting plant port of export is provided with an Air blowing cleaning dust device.
Arranging further, the second described frequency heating device is with mobile wheel disc.
The Coating Production Line of this steel pipe is compared to the beneficial effect of conventional art: the Coating Production Line of this steel pipe is provided with the first frequency heating device and the second frequency heating device, first frequency heating device and the second frequency heating device can be with the use of, better to play two frequency heating device maximum effects, energy saving is efficient again.
The second object of the present invention is in that to provide a kind of quick-dry type coating liquid layer coated technique, and concrete technical scheme is as follows: be positioned over by steel pipe on coating drive line, with setting speed constant level's straight line swing offset; Coating drive line drives steel pipe rotary advance to pass sequentially through steel pipe shot-blasting plant and eliminates rust; Steel pipe is heated to 40 DEG C 80 DEG C by the first frequency heating device; Adopt spray-painting plant by paint spraying at outer surface of steel tube; Finally by the steel pipe removal coating drive line that a moving-out device will process so that it is there is time enough film-forming; While steel pipe carries out spraying paint in spray-painting plant, reclaimed the gas and abnormal smells from the patient that produce in paint spraying by activated carbon reclaimer.
This coating liquid layer coated technique only need to use the first frequency heating device heating, simply efficiently.
The third object of the present invention is in that to provide a kind of 3PE anticorrosive coat coated technique, and concrete technical scheme is as follows: be positioned over by steel pipe on coating drive line, with setting speed constant level's straight line swing offset; Coating drive line drives steel pipe rotary advance to pass sequentially through steel pipe shot-blasting plant and eliminates rust; Steel pipe is heated to 40 DEG C 80 DEG C by the first frequency heating device, and steel pipe is heated to 180 DEG C 220 DEG C by the second frequency heating device; Epoxy powder is uniformly sprayed the outer surface of steel tube in heat by epoxy powder spray application device, and clinkering becomes the uniform coating of a layer thickness rapidly; In spraying on the steel pipe of epoxy powder, adhesive extruder and polyethylene (PE) extruder are wound around adhesive and polyethylene sheets successively on steel pipe; Steel pipe after completing immediately passes through water cooling system and lowers the temperature; Coating drive line moved away from by steel pipe by carrying inversion tube device; Finally by pipe end grinding apparatus, are polished in the two ends of steel pipe.
Described adhesive extruder and polyethylene (PE) extruder are by material uniformly in flake extrusion, and the steel pipe being rotationally advancing drives adhesive and polyethylene sheets to be wrapped in the outer surface of steel pipe uniformly.
The spacing of the former groups of roller-ways of water cooling system on described coating drive line is compact, to reduce the pressure suffered by hot anticorrosive coat, it is ensured that the anticorrosive coat thickness of commissure.
This 3PE anticorrosive coat coated technique first frequency heating device and the second frequency heating device, with the use of, use frequency heating device that can be effective and reasonable, solve the technical problem of the expense electricity that conventional art only has the first frequency heating device to bring.
In a word, the present invention provide one efficiently, environmental protection, safe, economic steel pipe Coating Production Line and the coating production technology mated with this production line.
Below in conjunction with the drawings and the specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram;
Fig. 2 is coating liquid layer coated technique flow chart;
Fig. 3 is 3PE anticorrosive coat coated technique flow chart.
Detailed description of the invention
As shown in Figure 1, for present configuration schematic diagram, what disclose is the Coating Production Line of a kind of steel pipe corrosion-proof erosion, including coating drive line 1, coating drive line 1 is sequentially provided with steel pipe shot-blasting plant the 2, first frequency heating device 3, spray-painting plant the 4, second frequency heating device 5, epoxy powder spray application device 6, adhesive extruder 7, polyethylene (PE) extruder 8 and water cooling system 9; Wherein, the side of described steel pipe shot-blasting plant 2 is connected and installed with a cyclone separator 21; Described spray-painting plant 4 side is connected and installed with a paint gas recovery system 41; 1 section of side of coating drive line between described spray-painting plant 4 and the second frequency heating device 5 is connected and installed with a coating drive line moving-out device 10; Described polyethylene (PE) extruder 8 feed end is provided with a concentration feeding system 81; Coating drive line after being positioned at described polyethylene (PE) extruder 81 section is provided with water cooling system 9; Being positioned on the latter end of described coating drive line 1 and be provided with carrying inversion tube device 11, the steel pipe that this carrying inversion tube device 11 can will be located on coating drive line 1 is moved away from.
Arranging further, the end side of described coating drive line 1 is provided with a pipe end grinding apparatus 12, and this grinding apparatus 12 is installed on rectilinear orbit 13, and described pipe end grinding apparatus 12 can along rectilinear orbit 13 displacement back and forth; Coating drive line 1 section between described entrance the second frequency heating device 5 and moving-out device 10 is removable Coating Production Line; Described steel pipe shot-blasting plant 2 port of export is provided with an Air blowing cleaning dust device 22; The second described frequency heating device 5 is with mobile wheel disc 51.
As in figure 2 it is shown, apply to a kind of quick-dry type coating liquid layer coated technique of the Coating Production Line of the above steel pipe: steel pipe is positioned on coating drive line, with setting speed constant level's straight line swing offset; Coating drive line drives steel pipe rotary advance to pass sequentially through steel pipe shot-blasting plant and eliminates rust; Steel pipe is heated to 40 DEG C 80 DEG C by the first frequency heating device; Adopt spray-painting plant by paint spraying at outer surface of steel tube; Finally by the steel pipe removal coating drive line that a moving-out device will process so that it is there is time enough film-forming. Wherein, while steel pipe carries out spraying paint in spray-painting plant, reclaimed the gas and abnormal smells from the patient that produce in paint spraying by activated carbon reclaimer.
Spray paint operation principle: steel pipe adopted the first frequency heating device to be heated to 40 DEG C 80 DEG C before spraying paint, adopt airless spraying pump by paint spraying in steel tube surface, adjust angle and the spray tolerance of the steel pipe speed of travel and paint sprayer, determine the thickness of coating, in order to make coating have hardening time, what this expediting setting type coating adopted is two-component materials, epoxy resin, polyurethanes and other macromolecule quick-dry type coating. This coating generally requires to complete to solidify in 10 minutes after spray mo(u)lding. Worm drive are walked hydraulic moving traveling wheel of trolley, road wheel resistance to 300 degree of high temperature not drives steel tube head is guided 12 meters outside drivewheel, this time is set in about 12 minutes. Steel tube head reserved 400mmNot spray paint。
Spray paint recovery system; In order to make steel pipe corrosion-proof construction working condition improve, the gas and the abnormal smells from the patient that produce in paint spraying must reclaim, main employing method blower fan activated carbon reclaimer.
This production technology is by the reform to steel pipe corrosion-proof production line, add liquid coating and spray this technique, design coating layer thickness is 200-1000 μm, can complete by disposable spray finishing, simultaneously also can composite coating, one layer of aluminized coating of outer wall elder generation metal spraying at steel pipe, coating layer thickness controls at 80-120 μm, then spraying liquid paint, such composite coating expenditure is more extensive, life cycle is longer, particularly the anticorrosion of tidal quay steel-pipe pile, and point each Jie's section requirement for anticorrosion of three regions (Ni Xiaqu, sea-water area and top of the waves district) is different.So it is also very required for having a multi-functional anticorrosion equipment, also protection is obtained above in the technology of reform simultaneously.
Another applies to the 3PE anticorrosive coat coated technique of Coating Production Line of the above steel pipe as shown in Figure 3: be positioned over by steel pipe on coating drive line, with setting speed constant level's straight line swing offset; Coating drive line drives steel pipe rotary advance to pass sequentially through steel pipe shot-blasting plant and eliminates rust; Steel pipe is heated to 40 DEG C 80 DEG C by the first frequency heating device, and steel pipe is heated to 180 DEG C 220 DEG C by the second frequency heating device; Epoxy powder is uniformly sprayed the outer surface of steel tube in heat by epoxy powder spray application device, and clinkering becomes the uniform coating of a layer thickness rapidly; In spraying on the steel pipe of epoxy powder, adhesive extruder and polyethylene (PE) extruder are wound around adhesive and polyethylene sheets successively on steel pipe; Steel pipe after completing immediately passes through water cooling system and lowers the temperature; Coating drive line moved away from by steel pipe by carrying inversion tube device; Finally by pipe end grinding apparatus, the two ends of steel pipe are carried out polishing to shape.
Wherein, described adhesive extruder and polyethylene (PE) extruder are by material uniformly in flake extrusion, and the steel pipe being rotationally advancing drives adhesive and polyethylene sheets to be wrapped in the outer surface of steel pipe uniformly; The spacing of the former groups of roller-ways of water cooling system on coating drive line is compact, to reduce the pressure suffered by hot anticorrosive coat, it is ensured that the anticorrosive coat thickness of commissure.
Steel pipe oil removing: after steel pipe manufacturing completes, indivedual commissures have oil stain, it is necessary to check and clean out with solvent; Described steel pipe ballasting rust remover includes supporting cleaner: cyclone separator, dust filter unit, connection pipeline etc.; Water cooling system includes 2 200 cubes and each one of 100 cubes of cooling towers, water pump pipeline and multiple nozzle.
Above-described embodiment and the graphic and non-limiting present invention, any person of an ordinary skill in the technical field, to its suitable change done, all should be regarded as the patent category without departing from the present invention.
Claims (6)
1. a quick-dry type coating liquid layer coated technique, it is characterised in that: steel pipe is positioned on coating drive line, with setting speed constant level's straight line swing offset; Coating drive line drives steel pipe rotary advance to pass sequentially through steel pipe shot-blasting plant and eliminates rust; Steel pipe is heated to 40 DEG C 80 DEG C by the first frequency heating device; Adopt spray-painting plant by paint spraying at outer surface of steel tube; The steel pipe removal coating drive line that transmission moving-out device will process is applied so that it is have time enough film-forming finally by one;
Described coating drive line is sequentially provided with steel pipe shot-blasting plant, the first frequency heating device, spray-painting plant, the second frequency heating device, epoxy powder spray application device, adhesive extruder, polyethylene (PE) extruder and water cooling system;
Wherein, the side of described steel pipe shot-blasting plant is connected and installed with a cyclone separator; Described spray-painting plant side is connected and installed with a paint gas recovery system;
Coating transmission line segment side between described spray-painting plant and the second frequency heating device is connected and installed with a coating transmission moving-out device;
Described polyethylene (PE) extruder feed end is provided with a concentration feeding system;
Coating transmission line segment after being positioned at described polyethylene (PE) extruder is provided with water cooling system;
Being positioned on the latter end of described coating drive line and be provided with carrying inversion tube device, the steel pipe that this carrying inversion tube device can will be located on coating drive line is moved away from.
2. quick-dry type coating liquid layer coated technique according to claim 1, it is characterised in that: while steel pipe carries out spraying paint in spray-painting plant, reclaimed the gas and abnormal smells from the patient that produce in paint spraying by activated carbon reclaimer.
3. quick-dry type coating liquid layer coated technique according to claim 1, it is characterized in that: the end side of described coating drive line is provided with a pipe end grinding apparatus, described pipe end grinding apparatus is installed on rectilinear orbit, and described pipe end grinding apparatus can along rectilinear orbit displacement back and forth.
4. quick-dry type coating liquid layer coated technique according to claim 1, it is characterised in that: the coating transmission line segment between described second frequency heating device and coating transmission moving-out device is removable Coating Production Line.
5. quick-dry type coating liquid layer coated technique according to claim 1, it is characterised in that: the described steel pipe shot-blasting plant port of export is provided with an Air blowing cleaning dust device.
6. quick-dry type coating liquid layer coated technique according to claim 1, it is characterised in that: the second described frequency heating device is with mobile wheel disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310483454.4A CN103542197B (en) | 2013-10-15 | 2013-10-15 | The Coating Production Line of a kind of steel pipe corrosion-proof erosion and coated technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310483454.4A CN103542197B (en) | 2013-10-15 | 2013-10-15 | The Coating Production Line of a kind of steel pipe corrosion-proof erosion and coated technique |
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| Publication Number | Publication Date |
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| CN103542197A CN103542197A (en) | 2014-01-29 |
| CN103542197B true CN103542197B (en) | 2016-06-15 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103861781B (en) * | 2014-03-25 | 2016-08-03 | 常州市金铃摩擦材料有限公司 | The coating method of a kind of friction sheets and glue application device |
| CN105441859A (en) * | 2015-03-12 | 2016-03-30 | 湖南华中钢结构有限公司 | Natural gas pipe anticorrosion coating method and device thereof |
| CN104668913B (en) * | 2015-03-18 | 2017-03-01 | 浙江久立泰祜涂层技术有限公司 | The manufacturing equipment of stainless steel tube three-layer polypropylene anti-corrosion pipe and its using method |
| CN104941964B (en) * | 2015-05-20 | 2017-03-29 | 中海油能源发展股份有限公司 | A kind of pipeline corrosion protection coating region pipe end cleaning technology |
| CN104923433B (en) * | 2015-07-03 | 2017-08-08 | 靖江市亚泰特种材料制造有限公司 | A kind of steel tube surface spraying equipment special mobile spray equipment |
| WO2017117747A1 (en) * | 2016-01-06 | 2017-07-13 | 辽宁亿通钢塑复合管制造有限公司 | Apparatus for applying adhesive on surface of pipe and method for same |
| CN108825931B (en) * | 2018-08-08 | 2023-07-21 | 华永康 | Processing technology of polyurea full-corrosion-resistant steel-plastic introducing pipe |
| CN109794385B (en) * | 2018-12-27 | 2021-03-05 | 山东光磊钢结构工程股份有限公司 | Anti-corrosion production line for net frame pipe |
| CN109759305B (en) * | 2019-03-29 | 2021-08-10 | 山东佰盛能源科技有限公司 | Rust removal and paint spraying method for underwater pipeline |
| CN110841828B (en) * | 2019-11-26 | 2021-04-13 | 潍坊天德管业有限公司 | Steel pipe surface anticorrosive paint spraying process |
| CN111196473A (en) * | 2020-01-14 | 2020-05-26 | 天津市鑫金钰防腐保温钢管有限公司 | Discharging system for production of anticorrosive steel pipes |
| CN113843121B (en) * | 2020-06-28 | 2023-03-24 | 宝山钢铁股份有限公司 | Variable frequency induction heating device and method for externally coated steel pipe |
| CN111889283B (en) * | 2020-07-28 | 2021-08-13 | 湖北文田新能源设备有限公司 | Online spraying of stock, stoving and wrap up in cloth device |
| CN114950873B (en) * | 2022-06-19 | 2023-01-31 | 陕西华辰亚联石油工程有限公司 | Corrosion prevention process for factory prefabricated corrosion-resistant alloy inner joint coating of fluid conveying pipeline |
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| GB2299145B (en) * | 1995-03-10 | 1998-12-09 | Bredero Price Services | Pipe coating |
| BRPI0516902B1 (en) * | 2004-11-24 | 2018-10-09 | Du Pont | fluid media piping and process for forming a non-stick surface |
| CN1844729A (en) * | 2005-04-08 | 2006-10-11 | 青岛大仓管道防腐保温器材有限公司 | Multi-process continuous machining line for corrosion prevention and thermal insulation of steel pipe |
| CN201475517U (en) * | 2009-08-07 | 2010-05-19 | 天华化工机械及自动化研究设计院 | Anti-corrosion tube with inner epoxy powder and outer three-layer PE composite coating |
| CN102837425B (en) * | 2012-10-08 | 2014-11-12 | 潍坊亿斯特管业科技有限公司 | Technology for coating three-layer polyethylene structure on outer wall and fusing epoxy resin on inner wall of steel pipe |
| CN103170443B (en) * | 2013-02-22 | 2015-04-15 | 北钢管业（营口）有限公司 | Coating production line of inner and outer walls of multifunctional steel pipe |
| CN203585589U (en) * | 2013-10-15 | 2014-05-07 | 浙江越州防腐工程有限公司 | Coating production line preventing steel pipe from corrosion |
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