CN104307812A - Cleaning method for oil on surfaces of steel pipe - Google Patents
Cleaning method for oil on surfaces of steel pipe Download PDFInfo
- Publication number
- CN104307812A CN104307812A CN201410627228.3A CN201410627228A CN104307812A CN 104307812 A CN104307812 A CN 104307812A CN 201410627228 A CN201410627228 A CN 201410627228A CN 104307812 A CN104307812 A CN 104307812A
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- China
- Prior art keywords
- steel pipe
- steam
- cleaning
- feeding path
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/023—Cleaning the external surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0269—Cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/032—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces by the mechanical action of a moving fluid
Abstract
The invention discloses a cleaning method for oil on surfaces of a steel pipe. The method is characterized in that the cleaning of an outer surface and an inner surface of the steel pipe is simultaneously realized by using boiler steam, wherein the temperature of the boiler steam is greater than 190 DEG C, and the pressure is greater than 0.8 MPa. The inner and outer surfaces of the steel pipe are cleaned by using the high-pressure steam; the method has the advantages of easiness in implementation, convenience in operation, quickness in cleaning, good cleaning effect, good protection effect on the surfaces of the steel pipe and the like.
Description
Technical field
The present invention relates to a kind of steel tube surface ROLLING OIL cleaning treatment technology, particularly relate to a kind of steel tube surface fluid cleaning method.
Background technology
In cold-rolling stainless steel pipe is produced, need special ROLLING OIL to carry out lubrication to base pipe and plug and roll, be beneficial to the roll forming to steel pipe.After steel pipe is sent into and is rolled out in cold pilger mill, the surface of steel pipe and inwall can be stained with the ROLLING OIL in cold pilger mill; Although part cold rolled tube chance is accompanied with recovering device for rolling oil, this recovering device for rolling oil generally only can recovery section steel tube surface ROLLING OIL with avoid waste, can not play and ROLLING OIL is removed clean effect.
Because grease does not remove reason thoroughly, serious impact can be caused on the final mass of tubing.So general stainless steel tube is when entering next process, need the cleaning first carrying out ROLLING OIL.And the cleaning that this rolling is carried out the grease of steel pipe surfaces externally and internally after completing is a very troublesome thing.Cleaning in the past is first put into inside stove by tubing to heat, again with the degrease liquid (wherein also will add special water base degreasing agent) after heating after grease is burnt, in special rinse bath, with liquor pump, degrease liquid is carried out there be circulating of certain impact power, allow grease come off from the surfaces externally and internally of tubing, finally clean with running water.
But be grease all can not be disposed up hill and dale in the tubing reality like this after process.Because the limited pressure of liquor pump, add that the length of tubing is general all about 4 meters length, the impact capacity of pump is not enough; Especially the pipe material inner wall cleaning up of minor diameter is particularly difficult.Tubing after degreasing agent cleaning, when cleaning with running water, is also the ideal effect not reaching cleaning due to the insufficient pressure of running water.So existing this steel tube surface degreasing method is insecure, not only operate inconvenience, workman's amount of labour is comparatively large, and there is grease and remove halfway problem.
Summary of the invention
For above-mentioned the deficiencies in the prior art, technical problem to be solved by this invention is: how to provide a kind of and implement simply, easy to operate, cleans quick and that cleaning performance is good steel tube surface fluid cleaning method.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
A kind of steel tube surface fluid cleaning method, is characterized in that, adopt Boiler Steam to realize the cleaning of outer surface of steel tube and inner surface, described boiler steam temperature is higher than 190 degrees Celsius, and pressure is higher than 0.8 MPa simultaneously.
The surfaces externally and internally of Boiler Steam to tubing is adopted to clean in the present invention.Principle is that the saturated-steam temperature that boiler produces can reach 190 degrees Celsius, and pressure can reach 0.8 MPa (if carry out drying process to saturated vapor, the temperature of steam is taller).If such pressure and temperature is directly used in the grease cleaning of tubing, effect is than directly reliable with the cleaning of degrease liquid.The feature of this principle is the high temperature due to steam, can by the grease rapid temperature increases of tube surfaces, and grease causes adhesive force to decline once its viscosity that heats up with regard to declining, add that the pressure that steam is higher is easy to just be removed totally by the grease of tube surfaces at high temperature under high pressure.Seem that to carry out jet douche efficiency one by one lower like this, in fact such method is the most reliable.Because the time short efficiency on the contrary of cleaning is higher.Just because specification more needs of tubing makes corresponding supporting cleaning hose and nozzle.But so but eliminate huge degrease groove, save a large amount of running water and expensive degreasing agent.The rubbish that its technical process produces seldom also is convenient to collect and process.Eliminate the problem of emission compliance.
Specifically, the present invention first obtains following cleaning device, described cleaning device comprises support feed mechanism and wiper mechanism, described support feed mechanism is for realizing horizontal support and the feeding of steel pipe, described wiper mechanism comprises steam injection equipment, and steam injection equipment is connected with Boiler Steam source and for realizing the cleaning to steel pipe; Described support feed mechanism comprises along steel pipe feeding method spaced several to backing roll, often pair of backing roll is oppositely arranged and opposite end downward-sloping formation herringbone shape, backing roll is installed in rotation on the locational space that support steel pipe is formed on roller seat and top, often pair of backing roll adjacent one end, often pair of backing roll comprises a live roll and a driven roll, and live roll is connected with power motor and can leans on power electric driven rotary; Described live roll upper end edge steel pipe direction of feed turns forward setting, and described driven roll is vertically arranged along steel pipe direction of feed; Described roll surface is provided with one deck rubber layer; In described wiper mechanism, steam injection equipment comprises the steam jet be arranged on above steel pipe feeding path, steam jet is just to the setting of steel pipe feeding path and for the cleaning to steel pipe outside, also comprise the steam-jet siphon being arranged at dead ahead, steel pipe feeding path, steam-jet siphon diameter is less than pipe diameter and cleans for inserting steel duct; Described steam jet is arranged in pairs and the often pair of steam jet is mutually vertical and be symmetrically arranged in above both sides, steel pipe feeding path, and steam jet lower end tilts toward steel pipe feeding rightabout;
When then cleaning, first steel pipe is placed in and supports on feed mechanism, starting power motor drives steel pipe to rotate advance along feeding path by live roll, during advance, realize outer surface of steel tube cleaning by the paired steam jet arranged, insert the cleaning of steel duct realization to steel pipe internal-surface by steam-jet siphon.
Like this, during actual cleaning, by high steam by the nozzle of pipeline and head directly to tubing jet impact.Area that nozzle sprays from the Distance geometry of tubing can be regulated to regulate surge, allow grease come off rapidly when HTHP from tubing like this and be separated.Wherein, have employed the cleaning device of designed, designed, realize steel pipe support by the paired backing roll arranged, structure simply and by backing roll rotates and steel pipe advance can be driven to realize cleaning before and after steel pipe.Wherein live roll is obliquely installed, and when making live roll frictionally drive steel pipe to advance along feeding path, can produce component diagonally, produce and rotate, outer surface of steel tube can be rinsed totally better while when steel pipe is advanced.The rubber layer of roll surface, can produce larger frictional force and drive steel pipe to advance, avoid steel pipe by steam impringement power refunds, rubber layer can make steel tube surface to sustain damage simultaneously, and steel tube surface protected effect is better.
Further, described steam-jet siphon outlet side has the loudspeaker section that one section of diameter becomes large.Like this, steam, after steam-jet siphon ejection, can present external diffusion impact conditions, drastically increase the cleaning performance to steel pipe internal-surface.
Further, steam-jet siphon is fixed on a supporting walls, supporting walls is positioned at front position front when steel pipe is positioned at feeding path termination, and correspondence is provided with a proximity switch of whether reaching home for examination steel tube, proximity switch is connected with power motor and for detecting that controlling power motor after steel pipe is reached home drives steel pipe to return along feeding path.
Like this, better Automated condtrol can be realized.
As optimization, in cleaning device, also comprise Anti-bouncing device, described Anti-bouncing device comprises at least one pinch roller be arranged at above steel pipe feeding path, pinch roller upper end is connected on a support arm along the setting of steel pipe feeding path by flexible supporting frames, pinch roller lower surface and the steel pipe upper surface be on feeding path are disposed adjacent, and described pinch roller circumferential flank surface is the arc with the indent of steel pipe top radian coupling, and described pinch roller circumferential flank surface is provided with one deck rubber layer; Make in cleaning process, pressured wheel prevents steel pipe from beating due to steam pressure change.
Like this, can prevent in cleaning process, depart from feeding path because the reasons such as air pressure shakiness cause steel pipe to be beated, ensure carrying out smoothly of cleaning process.Pinch roller surface texture makes, and when steel pipe is beated, increases steel pipe and pinch roller lower surface contact area and increases elasticity, making pinch roller to prevent steel pipe from beating better, and avoids damaging steel tube surface.
In sum, the present invention adopts the cleaning of high steam realization to steel pipe surfaces externally and internally, has and implements simply, and easy to operate, cleaning is quick and cleaning performance is good, to advantages such as steel tube surface protected effect are good.
Accompanying drawing explanation
Fig. 1 be the cleaning device adopted in the specific embodiment of the invention face direction structure schematic diagram.
Fig. 2 be the cleaning device adopted in the specific embodiment of the invention overlook direction structure schematic diagram.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail.
During concrete enforcement: a kind of steel tube surface fluid cleaning method, its main points are, adopt Boiler Steam to realize the cleaning of outer surface of steel tube and inner surface, described boiler steam temperature is higher than 190 degrees Celsius, and pressure is higher than 0.8 MPa simultaneously.
Its main points are also, first can obtain cleaning device as depicted in figs. 1 and 2, comprise and support feed mechanism and wiper mechanism, described support feed mechanism is for realizing horizontal support and the feeding of steel pipe 1, described wiper mechanism comprises steam injection equipment, and steam injection equipment is connected with Boiler Steam source and for realizing the cleaning to steel pipe.
Wherein, described support feed mechanism comprises along steel pipe feeding method spaced several to backing roll, often pair of backing roll is oppositely arranged and opposite end downward-sloping formation herringbone shape, backing roll is installed in rotation on the locational space that support steel pipe is formed on roller seat and top, often pair of backing roll adjacent one end, often pair of backing roll comprises a live roll 2 and a driven roll 3, and live roll 2 is connected with power motor and can leans on power electric driven rotary.Like this, realize steel pipe support by the paired backing roll arranged, structure simply and by backing roll rotates and steel pipe advance can be driven to realize cleaning before and after steel pipe.
Wherein, described live roll 2 upper end edge steel pipe direction of feed turns forward setting, and described driven roll 3 is vertically arranged along steel pipe 1 direction of feed.Like this, when live roll frictionally drives steel pipe to advance along feeding path, component diagonally can be produced, produce while when steel pipe is advanced and rotate, outer surface of steel tube can be rinsed totally better.
Wherein, described roll surface is provided with one deck rubber layer.Like this, rubber layer can produce larger frictional force and drive steel pipe to advance, and avoid steel pipe by steam impringement power refunds, rubber layer can make steel tube surface to sustain damage simultaneously, and steel tube surface protected effect is better.
Wherein, in described wiper mechanism, steam injection equipment comprises the steam jet 4 be arranged on above steel pipe feeding path, steam jet 4 is just to the setting of steel pipe 1 feeding path and for the cleaning to steel pipe 1 outside, also comprise the steam-jet siphon 5 being arranged at dead ahead, steel pipe feeding path, steam-jet siphon 5 diameter is less than steel pipe 1 internal diameter and cleans for inserting steel pipe 1 inside.Like this, wiper mechanism can realize the cleaning of steel pipe surfaces externally and internally simultaneously, and then achieves the omnibearing cleaning of steel pipe, drastically increases fluid cleaning performance.
Wherein, described steam jet 4 is arranged in pairs and the often pair of steam jet 4 is mutually vertical and be symmetrically arranged in above both sides, steel pipe feeding path, and steam jet 4 lower end tilts toward steel pipe feeding rightabout.The cleaning performance to outer surface of steel tube can be improved so better.
Wherein, described steam-jet siphon 5 outlet side has the loudspeaker section 6 that one section of diameter becomes large.Like this, steam, after steam-jet siphon ejection, can present external diffusion impact conditions, drastically increase the cleaning performance to steel pipe internal-surface.
Wherein, described steam jet 4 respectively at section start and the destination county in steel pipe feeding path, respectively can arrange a pair, prevents steel pipe to be stained with fluid on backing roll when returning.During concrete enforcement, steam-jet siphon 5 is fixed on a supporting walls 7, supporting walls 7 is positioned at front position front when steel pipe is positioned at feeding path termination, and correspondence is provided with a proximity switch 8 of whether reaching home for examination steel tube, proximity switch 8 is connected with power motor and drives steel pipe to return along feeding path for controlling power motor.
Wherein, also comprise Anti-bouncing device, described Anti-bouncing device comprises at least one pinch roller 9 be arranged at above steel pipe feeding path, pinch roller 9 upper end is connected on a support arm 12 along the setting of steel pipe feeding path by flexible supporting frames 11, and pinch roller 9 lower surface and steel pipe 1 upper surface be on feeding path are disposed adjacent.Like this, can prevent in cleaning process, depart from feeding path because the reasons such as air pressure shakiness cause steel pipe to be beated, ensure carrying out smoothly of cleaning process.
Wherein, the circumferential flank surface of described pinch roller 9 is the arc with the indent of steel pipe 1 top radian coupling.Like this, when steel pipe is beated, increase steel pipe and pinch roller lower surface contact area, make pinch roller to prevent steel pipe from beating better, and avoid damaging steel tube surface.
Wherein, described pinch roller 9 circumferential flank surface is provided with one deck rubber layer 10.Like this, by the elasticity of rubber layer 10, can avoid better damaging steel tube surface.
Adopt said apparatus to connect the surfaces externally and internally of Boiler Steam to tubing in the present invention to clean.Principle is that the saturated-steam temperature that boiler produces can reach 190 degrees Celsius, and pressure can reach 0.8 MPa (if carry out drying process to saturated vapor, the temperature of steam is taller).If such pressure and temperature is directly used in the grease cleaning of tubing, effect is than directly reliable with the cleaning of degrease liquid.Actual when using by high steam by the nozzle of pipeline and head directly to tubing jet impact.Area that nozzle sprays from the Distance geometry of tubing can be regulated to regulate surge, allow grease come off rapidly when HTHP from tubing like this and be separated.The feature of this principle is the high temperature due to steam, can by the grease rapid temperature increases of tube surfaces, and grease causes adhesive force to decline once its viscosity that heats up with regard to declining, add that the pressure that steam is higher is easy to just be removed totally by the grease of tube surfaces at high temperature under high pressure.Seem that to carry out jet douche efficiency one by one lower like this, in fact such method is the most reliable.Because the time short efficiency on the contrary of cleaning is higher.Just because specification more needs of tubing makes corresponding supporting cleaning hose and nozzle.But so but eliminate huge degrease groove, save a large amount of running water and expensive degreasing agent.The rubbish that its technical process produces seldom also is convenient to collect and process.Eliminate the problem of emission compliance.Therefore it is simple to have structure, easy to operate, cleaning is quick and cleaning performance is good, to advantages such as steel tube surface protected effect are good.
Claims (5)
1. a steel tube surface fluid cleaning method, is characterized in that, adopt Boiler Steam to realize the cleaning of outer surface of steel tube and inner surface, described boiler steam temperature is higher than 190 degrees Celsius, and pressure is higher than 0.8 MPa simultaneously.
2. steel tube surface fluid cleaning method as claimed in claim 1, it is characterized in that first obtaining following cleaning device, described cleaning device comprises support feed mechanism and wiper mechanism, described support feed mechanism is for realizing horizontal support and the feeding of steel pipe, described wiper mechanism comprises steam injection equipment, and steam injection equipment is connected with Boiler Steam source and for realizing the cleaning to steel pipe; Described support feed mechanism comprises along steel pipe feeding method spaced several to backing roll, often pair of backing roll is oppositely arranged and opposite end downward-sloping formation herringbone shape, backing roll is installed in rotation on the locational space that support steel pipe is formed on roller seat and top, often pair of backing roll adjacent one end, often pair of backing roll comprises a live roll and a driven roll, and live roll is connected with power motor and can leans on power electric driven rotary; Described live roll upper end edge steel pipe direction of feed turns forward setting, and described driven roll is vertically arranged along steel pipe direction of feed; Described roll surface is provided with one deck rubber layer; In described wiper mechanism, steam injection equipment comprises the steam jet be arranged on above steel pipe feeding path, steam jet is just to the setting of steel pipe feeding path and for the cleaning to steel pipe outside, also comprise the steam-jet siphon being arranged at dead ahead, steel pipe feeding path, steam-jet siphon diameter is less than pipe diameter and cleans for inserting steel duct; Described steam jet is arranged in pairs and the often pair of steam jet is mutually vertical and be symmetrically arranged in above both sides, steel pipe feeding path, and steam jet lower end tilts toward steel pipe feeding rightabout;
When then cleaning, first steel pipe is placed in and supports on feed mechanism, starting power motor drives steel pipe to rotate advance along feeding path by live roll, during advance, realize outer surface of steel tube cleaning by the paired steam jet arranged, insert the cleaning of steel duct realization to steel pipe internal-surface by steam-jet siphon.
3. steel tube surface fluid cleaning method as claimed in claim 2, it is characterized in that, described steam-jet siphon outlet side has the loudspeaker section that one section of diameter becomes large.
4. steel tube surface fluid cleaning method as claimed in claim 2, it is characterized in that, steam-jet siphon is fixed on a supporting walls, supporting walls is positioned at front position front when steel pipe is positioned at feeding path termination, and correspondence is provided with a proximity switch of whether reaching home for examination steel tube, proximity switch is connected with power motor and for detecting that controlling power motor after steel pipe is reached home drives steel pipe to return along feeding path.
5. steel tube surface fluid cleaning method as claimed in claim 2, it is characterized in that, in cleaning device, also comprise Anti-bouncing device, described Anti-bouncing device comprises at least one pinch roller be arranged at above steel pipe feeding path, pinch roller upper end is connected on a support arm along the setting of steel pipe feeding path by flexible supporting frames, pinch roller lower surface and the steel pipe upper surface be on feeding path are disposed adjacent, described pinch roller circumferential flank surface is the arc with the indent of steel pipe top radian coupling, and described pinch roller circumferential flank surface is provided with one deck rubber layer; Make in cleaning process, pressured wheel prevents steel pipe from beating due to steam pressure change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410627228.3A CN104307812B (en) | 2014-11-10 | 2014-11-10 | A kind of steel tube surface fluid cleaning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410627228.3A CN104307812B (en) | 2014-11-10 | 2014-11-10 | A kind of steel tube surface fluid cleaning method |
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| Publication Number | Publication Date |
|---|---|
| CN104307812A true CN104307812A (en) | 2015-01-28 |
| CN104307812B CN104307812B (en) | 2016-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410627228.3A Active CN104307812B (en) | 2014-11-10 | 2014-11-10 | A kind of steel tube surface fluid cleaning method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104984957A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Steam cleaning device for high-pressure oil pipe |
| CN108655117A (en) * | 2018-04-27 | 2018-10-16 | 海亮（安徽）铜业有限公司 | Guiding de-watering apparatus based on copper tube production |
| CN112238103A (en) * | 2020-09-15 | 2021-01-19 | 上上德盛集团股份有限公司 | Coating equipment for super-long clean corrosion-resistant stainless steel seamless steel pipe for ship |
| CN116871275A (en) * | 2023-09-07 | 2023-10-13 | 常州诺清智能科技有限公司 | Cleaning machine and electric heating system thereof |
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| US4460005A (en) * | 1981-04-01 | 1984-07-17 | The C. A. Rubio Company | Washing apparatus for tubular members |
| JPH06126323A (en) * | 1992-10-19 | 1994-05-10 | Kawasaki Steel Corp | Method for descaling inside surface of seamless steel pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104984957A (en) * | 2015-07-09 | 2015-10-21 | 张家港市圣鼎源制管有限公司 | Steam cleaning device for high-pressure oil pipe |
| CN108655117A (en) * | 2018-04-27 | 2018-10-16 | 海亮（安徽）铜业有限公司 | Guiding de-watering apparatus based on copper tube production |
| CN112238103A (en) * | 2020-09-15 | 2021-01-19 | 上上德盛集团股份有限公司 | Coating equipment for super-long clean corrosion-resistant stainless steel seamless steel pipe for ship |
| CN116871275A (en) * | 2023-09-07 | 2023-10-13 | 常州诺清智能科技有限公司 | Cleaning machine and electric heating system thereof |
| CN116871275B (en) * | 2023-09-07 | 2023-11-24 | 常州诺清智能科技有限公司 | Cleaning machine and electric heating system thereof |
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| Publication number | Publication date |
|---|---|
| CN104307812B (en) | 2016-07-13 |
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Effective date of registration: 20210309 Address after: 400084 No. 2, Magnesium Bridge Road, Area A, Jianqiao Industrial Park, Dadukou District, Chongqing Patentee after: CHONGQING IRON & STEEL INSTITUTE Co.,Ltd. Address before: Three village 400080 Dadukou District of Chongqing weir building 1 No. 1 Patentee before: CHONGQING IRON & STEEL (Group) Co.,Ltd. |