CN103542197A - Anticorrosive coating production line and process for steel pipes - Google Patents
Anticorrosive coating production line and process for steel pipes Download PDFInfo
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- CN103542197A CN103542197A CN201310483454.4A CN201310483454A CN103542197A CN 103542197 A CN103542197 A CN 103542197A CN 201310483454 A CN201310483454 A CN 201310483454A CN 103542197 A CN103542197 A CN 103542197A
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- steel pipe
- coating
- frequency heating
- drive line
- heating device
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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
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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
- B05B16/00—Spray booths
- B05B16/20—Arrangements for spraying in combination with other operations, e.g. drying; Arrangements enabling a combination of spraying operations
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- 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
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- 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
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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
- F16L58/1072—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being a sprayed layer
Abstract
The invention belongs to the field of anticorrosive coating, and particularly relates to an anticorrosive coating production line and process for steel pipes. The anticorrosive coating production line comprises a coating transmission line and is sequentially provided with a steel pipe shot blasting and rust removing device, a first medium-frequency heating device, a painting device, a second medium-frequency heating device, an epoxy powder spraying and coating device, an adhesive extruder, a PE (polyethylene) extruder and a water cooling system. The coating process applied on the anticorrosive coating production line mainly includes steps of shot blasting and rust removing, medium-frequency heating, painting, cooling and the like. The anticorrosive coating production line and process are efficient, environment-friendly, safe and economic.
Description
Technical field
The invention belongs to coating corrosion-resistant field, be specifically related to a kind of Coating Production Line and coated technique of steel pipe corrosion-proof erosion.
Background technique
Development and epoch in basic industry are progressive, the mankind more and more pay attention to the exploitation of ocean, the bridge spanning the sea of various places and ocean Wharf Construction are continuous, it is steel pipe pile that design need to be used maximum, and requiring is the steel pipe pile of whole making, as nearly hundred meters of Construction of Hangzhou Bay Cross-sea Bridge steel pipe pile length, particularly some external tidal quaies, length and diameter are all towards long and large future development.
Because steel pipe needs long period of soaking in the sea, seawater carries out long-term corrosion to steel pipe, the corrosivity of seawater 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 efficient a, environmental protection, safe, economic steel pipe Coating Production Line and the coating production technology of mating with this production line, this case produces thus.
Summary of the invention
The first object of the present invention is to provide a kind of Coating Production Line of steel pipe, concrete technological scheme is as follows: a kind of Coating Production Line of steel pipe corrosion-proof erosion, comprise coating drive line, on coating drive line, be provided with successively steel pipe shot-blasting plant, the first frequency heating device, spray-painting plant, the second frequency heating device, epoxy powder spraying applying device, adhesive extruder, polyethylene (PE) extruder and water cooling system; Wherein, a side of described steel pipe shot-blasting plant is connected and installed with a cyclone separator; Described spray-painting plant one 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 one and concentrates feeding system; Be positioned on described polyethylene (PE) extruder coating transmission line segment afterwards water cooling system is installed; Be positioned at and on the latter end of described coating drive line, carrying be installed and turn over pipe device, this carrying is turned over pipe device and the steel pipe being positioned on coating drive line can be moved away from.
Further arrange, 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 be along rectilinear orbit displacement back and forth.
Further arranging, is removable Coating Production Line at the described coating transmission line segment entering between the second frequency heating device and moving-out device.
Further arrange, described steel pipe shot-blasting plant outlet end is provided with an Air blowing cleaning dust device.
Further arrange, 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, the first frequency heating device and the second frequency heating device can be used in conjunction with, better to bring into play two frequency heating device maximum effects, energy saving is efficient again.
The second object of the present invention is to provide a kind of quick-dry type coating liquid layer coated technique, and concrete technological scheme is as follows: steel pipe is positioned on coating drive line, with setting speed horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe; Adopt spray-painting plant by paint spraying at outer surface of steel tube; Finally by a moving-out device, the steel pipe processing is shifted out to coating drive line, make it have time enough film-forming; When steel pipe sprays paint in spray-painting plant, by active carbon recovery plant, reclaim gas and the smell producing in paint spraying.
This coating liquid layer coated technique only need use the first frequency heating device heating, simply efficient.
The 3rd object of the present invention is to provide a kind of 3PE anticorrosive coat coated technique, and concrete technological scheme is as follows: steel pipe is positioned on coating drive line, with setting speed horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe, and the second frequency heating device is heated to 180 ℃-220 ℃ by steel pipe; Epoxy powder spraying applying device uniformly sprays epoxy powder at hot outer surface of steel tube, 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 is wound around adhesive and polyethylene sheets successively on steel pipe; Steel pipe after completing is lowered the temperature by water cooling system at once; Carrying is turned over pipe device steel pipe is moved away to coating drive line; Finally by pipe end grinding apparatus, polished in the two ends of steel pipe.
Described adhesive extruder and polyethylene (PE) extruder are laminar extruding uniformly by material, and the steel pipe that rotation is advanced drives adhesive and polyethylene sheets to be wrapped in uniformly the outer surface of steel pipe.
The spacing of the former groups of roller-ways of water cooling system on described coating drive line is compact, to reduce the suffered pressure of hot anticorrosive coat, guarantees the anticorrosive coat thickness of weld joint.
This 3PE anticorrosive coat coated technique first frequency heating device and the second frequency heating device are used in conjunction with, and use frequency heating device that can be effective and reasonable has solved the technical problem that conventional art only has the expense electricity that the first frequency heating device brings.
In a word, the invention provides efficient a, environmental protection, safe, economic steel pipe Coating Production Line and the coating production technology of mating 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 structural representation of the present invention;
Fig. 2 is coating liquid layer coated technique flow chart;
Fig. 3 is 3PE anticorrosive coat coated technique flow chart.
Embodiment
As shown in Figure 1, for structural representation of the present invention, what disclose is a kind of Coating Production Line of steel pipe corrosion-proof erosion, comprise coating drive line 1, on coating drive line 1, be provided with successively steel pipe shot-blasting plant 2, the first frequency heating device 3, spray-painting plant 4, the second frequency heating device 5, epoxy powder spraying applying device 6, adhesive extruder 7, polyethylene (PE) extruder 8 and water cooling system 9; Wherein, a side of described steel pipe shot-blasting plant 2 is connected and installed with a cyclone separator 21; Described spray-painting plant 4 one sides are 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 ends are provided with one and concentrate feeding system 81; Be positioned on 1 section of coating drive line after described polyethylene (PE) extruder 8 water cooling system 9 is installed; Be positioned at and on the latter end of described coating drive line 1, carrying be installed and turn over pipe device 11, this carrying is turned over pipe device 11 and the steel pipe being positioned on coating drive line 1 can be moved away from.
Further arrange, 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 be along rectilinear orbit 13 displacement back and forth; At described 1 section of the coating drive line between the second frequency heating device 5 and moving-out device 10 that enters, it is removable Coating Production Line; Described steel pipe shot-blasting plant 2 outlet end are provided with an Air blowing cleaning dust device 22; The second described frequency heating device 5 is with mobile wheel disc 51.
As shown in Figure 2, 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 horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe; Adopt spray-painting plant by paint spraying at outer surface of steel tube; Finally by a moving-out device, the steel pipe processing is shifted out to coating drive line, make it have time enough film-forming.Wherein, when steel pipe sprays paint in spray-painting plant, by active carbon recovery plant, reclaim gas and the smell producing in paint spraying.
The working principle of spraying paint: steel pipe adopted the first frequency heating device to be heated to 40 ℃-80 ℃ 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 curing time, what this expediting setting type coating adopted is two-component materials, epoxy resin, polyurethanes and other macromolecule quick-dry type coating.This coating General Requirements after spray mo(u)lding completed curing in 10 minutes.The power screw hydraulic moving traveling wheel of trolley of walking, drive is not the driving wheel outside 12 meters of steel tube head guiding for the resistance to 300 degree high temperature of road wheel, and this time was set in about 12 minutes.Steel tube head reserved 400
mmspray paint not
.
The reclaiming system of spraying paint; For steel pipe corrosion-proof construction conditions of manufacture is improved, the gas producing in paint spraying and smell must reclaim, and mainly adopt method blower fan active carbon recovery plant.
This production technology is by the reform to steel pipe corrosion-proof production line, increase liquid coating and sprayed this technique, design coating thickness is 200-1000 μ m, can complete by disposable spray finishing, simultaneously also can composite coating, the first metal spraying one deck of outer wall aluminium paint at steel pipe, coating thickness is controlled at 80-120 μ m, then spray liquid coating, such composite coating expenditure is more extensive, life cycle is longer, and particularly tidal quay steel pipe pile is anticorrosion, and each the section requirement for anticorrosion that is situated between of minute three regions (mud inferior segment, sea-water area and top of the waves district) is different.So it is also very essential having a multi-functional anticorrosion equipment, also on the technology of reform, be protected simultaneously.
Another applies to the 3PE anticorrosive coat coated technique of the Coating Production Line of the above steel pipe as shown in Figure 3: steel pipe is positioned on coating drive line, with setting speed horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe, and the second frequency heating device is heated to 180 ℃-220 ℃ by steel pipe; Epoxy powder spraying applying device uniformly sprays epoxy powder at hot outer surface of steel tube, 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 is wound around adhesive and polyethylene sheets successively on steel pipe; Steel pipe after completing is lowered the temperature by water cooling system at once; Carrying is turned over pipe device steel pipe is moved away to coating drive line; Finally by pipe end grinding apparatus by the shaping of polishing of the two ends of steel pipe.
Wherein, described adhesive extruder and polyethylene (PE) extruder are laminar extruding uniformly by material, and the steel pipe that rotation is advanced drives adhesive and polyethylene sheets to be wrapped in uniformly the outer surface of steel pipe; The spacing of the former groups of roller-ways of water cooling system on coating drive line is compact, to reduce the suffered pressure of hot anticorrosive coat, guarantees the anticorrosive coat thickness of weld joint.
Steel pipe oil removing: after steel pipe manufacturing completes, indivedual weld joints have oil stain, must check and clean out with solvent; Described steel pipe ballasting rust remover comprises supporting dusting apparatus: cyclone separator, dust filter unit, connecting tube etc.; Water cooling system comprises each of 2 200 cubes and 100 cubes of cooling tower, water pump pipeline and a plurality of nozzle.
Above-described embodiment and graphic and non-limiting the present invention, the suitable variation that any person of an ordinary skill in the technical field does it, all should be considered as not departing from patent category of the present invention.
Claims (10)
1. the Coating Production Line of steel pipe corrosion-proof erosion, it is characterized in that: comprise coating drive line, on coating drive line, be provided with successively steel pipe shot-blasting plant, the first frequency heating device, spray-painting plant, the second frequency heating device, epoxy powder spraying applying device, adhesive extruder, polyethylene (PE) extruder and water cooling system;
Wherein, a side of described steel pipe shot-blasting plant is connected and installed with a cyclone separator; Described spray-painting plant one 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 one and concentrates feeding system;
Be positioned on described polyethylene (PE) extruder coating transmission line segment afterwards water cooling system is installed;
Be positioned at and on the latter end of described coating drive line, carrying be installed and turn over pipe device, this carrying is turned over pipe device and the steel pipe being positioned on coating drive line can be moved away from.
2. the Coating Production Line that steel pipe corrosion-proof according to claim 1 loses, it is characterized in that: the end side of described coating drive line is provided with a pipe end grinding apparatus, this grinding apparatus is installed on rectilinear orbit, and described pipe end grinding apparatus can be along rectilinear orbit displacement back and forth.
3. the Coating Production Line of steel pipe corrosion-proof erosion according to claim 1, is characterized in that: at the described coating transmission line segment entering between the second frequency heating device and moving-out device, be removable Coating Production Line.
4. the Coating Production Line of steel pipe corrosion-proof erosion according to claim 1, is characterized in that: described steel pipe shot-blasting plant outlet end is provided with an Air blowing cleaning dust device.
5. the Coating Production Line of steel pipe corrosion-proof erosion according to claim 1, is characterized in that: the second described frequency heating device is with mobile wheel disc.
6. a quick-dry type coating liquid layer coated technique, is characterized in that: steel pipe is positioned on coating drive line, with setting speed horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe; Adopt spray-painting plant by paint spraying at outer surface of steel tube; Finally by a moving-out device, the steel pipe processing is shifted out to coating drive line, make it have time enough film-forming.
7. quick-dry type coating liquid layer coated technique according to claim 6, is characterized in that: when steel pipe sprays paint in spray-painting plant, reclaim gas and the gentle taste of smell producing in paint spraying by active carbon recovery plant.
8. a 3PE anticorrosive coat coated technique, is characterized in that: steel pipe is positioned on coating drive line, with setting speed horizontal linear swing offset at the uniform velocity; Coating drive line drives steel pipe rotary to advance and by steel pipe shot-blasting plant, eliminates rust successively; The first frequency heating device is heated to 40 ℃-80 ℃ by steel pipe, and the second frequency heating device is heated to 180 ℃-220 ℃ by steel pipe; Epoxy powder spraying applying device uniformly sprays epoxy powder at hot outer surface of steel tube, 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 is wound around adhesive and polyethylene sheets successively on steel pipe; Steel pipe after completing is lowered the temperature by water cooling system at once; Carrying is turned over pipe device steel pipe is moved away to coating drive line; Finally by pipe end grinding apparatus by the shaping of polishing of the two ends of steel pipe.
9. 3PE anticorrosive coat coated technique according to claim 8, it is characterized in that: adhesive extruder and polyethylene (PE) extruder is laminar extruding uniformly by material, the steel pipe that rotation is advanced drives adhesive and polyethylene sheets to be wrapped in uniformly the outer surface of steel pipe.
10. 3PE anticorrosive coat coated technique according to claim 8, is characterized in that: the spacing of the former groups of roller-ways of water cooling system on coating drive line is compact, to reduce the suffered pressure of hot anticorrosive coat, guarantees the anticorrosive coat thickness of weld joint.
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| 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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| 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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| CN103542197B CN103542197B (en) | 2016-06-15 |
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| CN103861781A (en) * | 2014-03-25 | 2014-06-18 | 常州市金铃摩擦材料有限公司 | Method for sizing of friction surface sheet and sizing device |
| CN104668913A (en) * | 2015-03-18 | 2015-06-03 | 浙江久立泰祜涂层技术有限公司 | Manufacturing equipment for stainless steel pipe three-layered polypropylene anticorrosion pipes and manufacturing method of manufacturing equipment |
| CN104923433A (en) * | 2015-07-03 | 2015-09-23 | 安庆联泰电子科技有限公司 | Movable spraying device special for steel pipe surface spraying equipment |
| CN104941964A (en) * | 2015-05-20 | 2015-09-30 | 中国海洋石油总公司 | Pipeline anticorrosion coating area pipe end cleaning technology |
| 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 |
| 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 |
| CN108825931A (en) * | 2018-08-08 | 2018-11-16 | 华永康 | The full antiseptic steel-plastic of polyureas introduces pipe and its processing technology |
| CN109759305A (en) * | 2019-03-29 | 2019-05-17 | 姚恩香 | A kind of submarine pipeline derusting method for paint spraying |
| CN109794385A (en) * | 2018-12-27 | 2019-05-24 | 山东光磊钢结构工程股份有限公司 | Rack pipe antisepsis production line |
| CN110841828A (en) * | 2019-11-26 | 2020-02-28 | 江国升 | 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 |
| CN111889283A (en) * | 2020-07-28 | 2020-11-06 | 湖北文田新能源设备有限公司 | Online spraying of stock, stoving and wrap up in cloth device |
| CN113843121A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Variable frequency induction heating device and method for externally coated steel pipe |
| CN114950873A (en) * | 2022-06-19 | 2022-08-30 | 陕西华辰亚联石油工程有限公司 | Anticorrosion process for factory prefabricated corrosion-resistant alloy inner joint coating of fluid conveying pipeline |
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