CN103317110A - High-efficiency automatic casting starting system based on crystallizer liquid level detection - Google Patents
High-efficiency automatic casting starting system based on crystallizer liquid level detection Download PDFInfo
- Publication number
- CN103317110A CN103317110A CN2013102324778A CN201310232477A CN103317110A CN 103317110 A CN103317110 A CN 103317110A CN 2013102324778 A CN2013102324778 A CN 2013102324778A CN 201310232477 A CN201310232477 A CN 201310232477A CN 103317110 A CN103317110 A CN 103317110A
- Authority
- CN
- China
- Prior art keywords
- liquid level
- control device
- plc control
- value
- stopper
- 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.)
- Granted
Links
Images
Landscapes
- Continuous Casting (AREA)
- Feedback Control In General (AREA)
Abstract
The invention relates to a high-efficiency automatic casting starting system based on crystallizer liquid level detection. The system comprises a programmable logic controller (PLC) control device connected with a stopper control mechanism, a crystallizer liquid level detection device, an industrial personal computer and a tension leveler. The stopper control mechanism is connected with the crystallizer liquid level detection device and the tension leveler, the PLC control device is connected with the stopper control mechanism through a motor driver, and a secondary instrument is connected between the PLC control device and the crystallizer liquid level detection device. The system has the advantage that an artificial intelligent technology is reasonably combined with continuous casting automatic casting starting control, parameter control accuracy in manual casting starting is improved, a steel factory does not need to depend on technicians rich in experience in the casting starting process, high-efficiency automation of the continuous casting industry is achieved, and steel leakage accidents caused by crystallizer liquid level fluctuation in the casting starting process can be prevented by means of stable accurate data control.
Description
Technical field
The present invention relates to the continuous casting project technical field, relate in particular to a kind of efficient automatic casting system that detects based on mould liquid level.
Background technology
Automatic casting control is one of key technology in the modern continuous casting, and continuous casting project automation control is had great significance.The purpose of automatic casting is that the data according to sensor cooperate accurate computer computational process, the process of watering of opening in the continuous casting project is carried out automation control, reduced the labour that control manually produces greatly, simultaneously by rational precise parameters control, can improve the quality of continuous casting billet to a certain extent, also can prevent from opening the incidence of watering the mould liquid level fluctuation that produces and causing the bleed-out accident.It is reported that at present domestic employed automatic casting system success rate is up to 90%.
Summary of the invention
The purpose of this invention is to provide a kind of efficient automatic casting system that detects based on mould liquid level, to solve the control of continuous casting project automatic casting process, guarantee to open to water success rate, prevent from opening the incidence of watering process bleed-out accident.
The objective of the invention is to be achieved through the following technical solutions:
A kind of efficient automatic casting system that detects based on mould liquid level, comprise the PLC control device, described PLC control device is connected with stopper controlling organization, mold liquid level checkout gear, industrial computer and straightening machine respectively, described stopper controlling organization is connected with the straightening machine by the mold liquid level checkout gear, be connected with motor driver between described PLC control device and the stopper control structure, be connected with secondary meter between described PLC control device and the mold liquid level checkout gear.
The method of operating of the described efficient automatic casting system that detects based on mould liquid level may further comprise the steps:
1) operator imports or imports the pulling rate value in zero moment and the position of stopper by system default;
2) system begins to water from detecting, and just extracts current mold liquid level height value from basic automatization level PLC control device, and obtains current best pulling rate value and the stopper positional value that should mate;
3) with the data value that obtains, and minute book group parameter, simultaneously with this group parameter as data sample;
4) calculate liquid level, and reach next regulation constantly at liquid level, according to data change pulling rate and the stopper position of expert database; And
5) at the appointed time, if detected liquid level and theory calculate time height zero deflection, then should organize data and return to basic automatization level PLC control device and control automatic casting end, system's complete operation; If highly there are deviation detected liquid level and the theory time that calculates, then compensate, described compensation may further comprise the steps:
1) carries out about 20 automatic castings continuously, obtain 20 sample datas, utilize Kalman's regression coefficient to calculate optimum liquid level value, stopper positional value and pulling rate value;
2) utilize optimal value to compensate the data of expert database; And
3) should organize data and return to basic automatization level PLC control device and control, automatic casting finishes, system's complete operation.
Beneficial effect of the present invention is: artificial intelligence technology is rational in conjunction with controlling with the continuous casting automatic casting, improved and opened the precision of when watering parameter being controlled manually, steel mill can be no longer dependent on exper ienced technical staff in opening the process of watering, realize the high-efficient automatic of continuous casting industry, stablize accurate Data Control, thus the incidence of the bleed-out accident that the liquid level fluctuation of crystallizer that can also prevent from causing in opening the process of watering causes.
Description of drawings
With reference to the accompanying drawings the present invention is described in further detail below.
Fig. 1 is the structured flowchart of the described a kind of efficient automatic casting system that detects based on mould liquid level of the embodiment of the invention;
Fig. 2 is the flow chart of the method for operating of the described a kind of efficient automatic casting system that detects based on mould liquid level of the embodiment of the invention.
Among the figure:
1, PLC control device; 2, stopper controlling organization; 3, mold liquid level checkout gear; 4, industrial computer; 5, straightening machine; 6, motor driver; 7, secondary meter.
The specific embodiment
As shown in Figure 1, the described a kind of efficient automatic casting system that detects based on mould liquid level of the embodiment of the invention, comprise PLC control device 1, described PLC control device 1 is connected with stopper controlling organization 2, mold liquid level checkout gear 3, industrial computer 4 and straightening machine 5 respectively, described stopper controlling organization 2 is connected with straightening machine 5 by mold liquid level checkout gear 3, be connected with motor driver 6 between described PLC control device 1 and the stopper controlling organization 2, be connected with secondary meter 7 between described PLC control device 1 and the mold liquid level checkout gear 3.
As shown in Figure 2, native system need not manually-operated, hardware platform and software platform build finish and connect after, whether system can automatic detection begin to water, like this can be because nozzle blocking cause the situation generation of automatic casting failure with regard to having solved existing automatic casting system; Described method of operating may further comprise the steps:
1) operator imports or imports the pulling rate value in zero moment and the position of stopper controlling organization 2 by system default;
2) system begins to water from detecting, and just extracts the liquid level value of current mold liquid level checkout gear 3 from basic automatization level PLC control device 1, and obtains the current best pulling rate value that should mate and stopper controlling organization 2 positional values;
3) with the data value that obtains, and minute book group parameter, simultaneously with this group parameter as data sample;
4) calculate liquid level, and reach next regulation constantly at liquid level, according to data change pulling rate and the stopper position of expert database; And
5) at the appointed time, if detected liquid level and theory calculate time height zero deflection, then should organize data and return to basic automatization level PLC control device 1 and control automatic casting end, system's complete operation.
In the step 5), if highly there are deviation liquid level and the theory time that calculates of detected mold liquid level checkout gear 3, then compensate, compensation data may further comprise the steps:
1) carries out about 20 automatic castings continuously, obtain 20 sample datas, utilize Kalman's regression coefficient to calculate optimum liquid level value, stopper controlling organization 2 positional values and pulling rate value;
2) utilize optimal value to compensate the data of expert database; And
3) should organize data and return to basic automatization level PLC control device 1 and control, automatic casting finishes, system's complete operation.
So just, realized at different industrial environments, different conticaster system and be the different allocation strategies that difference is built steel grade.
During concrete the use, slave computer PLC control device 1 obtains needed data in the automatic casting control system by the value of the liquid level of collection conticaster crystallizer liquid level sensor 3; Slave computer PLC control device 1 is passed to industrial computer 4 by the mode of data communication with data; After configuration software value of receiving of industrial computer 4, value is passed control module in the configuration interface; Control receives data, earlier these group data are stored in the database, according to value inquiry continuous casting automatic casting expert database, draw current stopper position and pulling rate optimum matching point again, and next situation constantly predicted, note constantly data; Stopper position and pulling rate optimum matching point are returned to slave computer PLC control device 1; 1 pair of stopper controlling organization 2 of slave computer PLC control device and straightening machine 5 are controlled; Second class value that industrial computer 4 controls receive should compare with predicted value, and identical this class value of expert database that then shows does not need to continue optimization again; If different, the group parameter of expert system is made amendment and compensate by the strategy of adaptive and learning system.
The present invention is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present invention; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, all drops within protection scope of the present invention.
Claims (3)
1. efficient automatic casting system that detects based on mould liquid level, comprise PLC control device (1), it is characterized in that: described PLC control device (1) is connected with stopper controlling organization (2) respectively, mold liquid level checkout gear (3), industrial computer (4) and straightening machine (5), described stopper controlling organization (2) is connected with straightening machine (5) by mold liquid level checkout gear (3), be connected with motor driver (6) between described PLC control device (1) and the stopper controlling organization (2), be connected with secondary meter (7) between described PLC control device (1) and the mold liquid level checkout gear (3).
2. the method for operating of the described efficient automatic casting system that detects based on mould liquid level of claim 1 is characterized in that, may further comprise the steps:
1) operator imports or imports the pulling rate value in zero moment and the position of stopper controlling organization (2) by system default;
2) system begins to water from detecting, and just extracts the liquid level value of current mold liquid level checkout gear (3) from basic automatization level PLC control device (1), and obtains the current best pulling rate value that should mate and stopper controlling organization (2) positional value;
3) with the data value that obtains, and minute book group parameter, simultaneously with this group parameter as data sample;
4) calculate liquid level, and reach next regulation constantly at liquid level, according to data change pulling rate and the stopper position of expert database; And
5) at the appointed time, if detected liquid level and theory calculate time height zero deflection, then should organize data and return to basic automatization level PLC control device (1) and control automatic casting end, system's complete operation.
3. the method for operating of the efficient automatic casting system that detects based on mould liquid level according to claim 2, it is characterized in that: in the step 5), if highly there are deviation liquid level and the theory time that calculates of detected mold liquid level checkout gear (3), then compensate, described compensation may further comprise the steps:
1) carries out about 20 automatic castings continuously, obtain 20 sample datas, utilize Kalman's regression coefficient to calculate optimum liquid level value, stopper controlling organization (2) positional value and pulling rate value;
2) utilize optimal value to compensate the data of expert database; And
3) should organize data and return to basic automatization level PLC control device (1) and control, automatic casting finishes, system's complete operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310232477.8A CN103317110B (en) | 2013-06-13 | 2013-06-13 | High-efficiency automatic casting starting system based on crystallizer liquid level detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310232477.8A CN103317110B (en) | 2013-06-13 | 2013-06-13 | High-efficiency automatic casting starting system based on crystallizer liquid level detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103317110A true CN103317110A (en) | 2013-09-25 |
| CN103317110B CN103317110B (en) | 2017-02-08 |
Family
ID=49186317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310232477.8A Active CN103317110B (en) | 2013-06-13 | 2013-06-13 | High-efficiency automatic casting starting system based on crystallizer liquid level detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103317110B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550807A (en) * | 2014-12-24 | 2015-04-29 | 江苏永钢集团有限公司 | Automatic casting method of sizing nozzle of continuous casting machine |
| CN105204473A (en) * | 2015-09-30 | 2015-12-30 | 芜湖新兴铸管有限责任公司 | Continuous casting billet separating system |
| CN105215308A (en) * | 2015-09-30 | 2016-01-06 | 芜湖新兴铸管有限责任公司 | A kind of continuous casting divides the control method of base system |
| CN105665675A (en) * | 2016-04-07 | 2016-06-15 | 江苏永钢集团有限公司 | Automatic control and alarming system of molten steel liquid level in crystallizer of continuous casting machine |
| CN107570674A (en) * | 2017-08-08 | 2018-01-12 | 新疆八钢铁股份有限公司 | Billet continuous casting sizing automatic casting control method |
| CN108145112A (en) * | 2016-12-05 | 2018-06-12 | 上海梅山钢铁股份有限公司 | Sheet billet continuous casting stopper rod flow control automatic casting technique based on liquid automatic control |
| CN108620547A (en) * | 2018-04-19 | 2018-10-09 | 芜湖新兴铸管有限责任公司 | Continuous casting opens the method poured |
| CN110340322A (en) * | 2019-08-22 | 2019-10-18 | 联峰钢铁（张家港）有限公司 | A kind of method and apparatus of continuous casting automatic casting |
| CN110883332A (en) * | 2019-11-21 | 2020-03-17 | 中冶赛迪技术研究中心有限公司 | Method and system for detecting water gap blockage on line |
| CN111451466A (en) * | 2020-04-16 | 2020-07-28 | 山东莱钢永锋钢铁有限公司 | Automatic casting method and system for continuous casting and casting in steel mill |
| CN111468694A (en) * | 2020-04-10 | 2020-07-31 | 山东钢铁股份有限公司 | Method for starting casting automatically in fixed-diameter casting process of billet continuous casting machine |
| CN112170800A (en) * | 2020-10-04 | 2021-01-05 | 湖南乾源冶金设备有限公司 | Method for detecting liquid level of radioactive molten steel of crystallizer |
| CN113263170A (en) * | 2021-05-13 | 2021-08-17 | 马鞍山钢铁股份有限公司 | Method for remedying bleed-out by pouring cut-off of sizing nozzle of continuous casting machine |
| CN114905021A (en) * | 2022-05-30 | 2022-08-16 | 首钢京唐钢铁联合有限责任公司 | Method for detecting liquid level of molten steel in crystallizer of continuous casting machine |
| CN115415491A (en) * | 2022-08-30 | 2022-12-02 | 广西钢铁集团有限公司 | Automatic tundish casting method in slab continuous casting process |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02290657A (en) * | 1989-04-28 | 1990-11-30 | Toshiba Corp | Apparatus for controlling level in mold |
| JPH05329605A (en) * | 1992-05-29 | 1993-12-14 | Kawasaki Steel Corp | Starting method of automatic casting of continuous casting |
| JPH06304726A (en) * | 1993-04-20 | 1994-11-01 | Nippon Steel Corp | Method for controlling molten metal surface level |
| JPH0857617A (en) * | 1994-08-19 | 1996-03-05 | Nippon Steel Corp | Automatic start controller for continuous casting |
| JPH08294754A (en) * | 1995-03-01 | 1996-11-12 | Nkk Corp | Method for controlling automatic start of continuous casting and device therefor |
| CN1420808A (en) * | 2000-03-29 | 2003-05-28 | Sms迪马格股份公司 | Automatic start method and device for continuous casting systems |
| CN1116138C (en) * | 1995-02-28 | 2003-07-30 | 日本钢管株式会社 | Method of controlling continuous casting and apparatus thereof |
| CN201693169U (en) * | 2010-06-20 | 2011-01-05 | 武汉钢铁(集团)公司 | Automatic pouring device of tundish |
| JP2011143414A (en) * | 2010-01-12 | 2011-07-28 | Nippon Steel Corp | Apparatus and method for controlling in-mold molten metal surface level in continuous casting machine |
| CN102717039A (en) * | 2012-07-09 | 2012-10-10 | 田志恒 | Automatic plate blank continuous casting machine tundish pouring method and automatic pouring system |
| CN202527698U (en) * | 2012-04-05 | 2012-11-14 | 上海海能信息科技有限公司 | Automatic control system for motor direct-drive stopper |
-
2013
- 2013-06-13 CN CN201310232477.8A patent/CN103317110B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02290657A (en) * | 1989-04-28 | 1990-11-30 | Toshiba Corp | Apparatus for controlling level in mold |
| JPH05329605A (en) * | 1992-05-29 | 1993-12-14 | Kawasaki Steel Corp | Starting method of automatic casting of continuous casting |
| JPH06304726A (en) * | 1993-04-20 | 1994-11-01 | Nippon Steel Corp | Method for controlling molten metal surface level |
| JPH0857617A (en) * | 1994-08-19 | 1996-03-05 | Nippon Steel Corp | Automatic start controller for continuous casting |
| CN1116138C (en) * | 1995-02-28 | 2003-07-30 | 日本钢管株式会社 | Method of controlling continuous casting and apparatus thereof |
| JPH08294754A (en) * | 1995-03-01 | 1996-11-12 | Nkk Corp | Method for controlling automatic start of continuous casting and device therefor |
| CN1420808A (en) * | 2000-03-29 | 2003-05-28 | Sms迪马格股份公司 | Automatic start method and device for continuous casting systems |
| JP2011143414A (en) * | 2010-01-12 | 2011-07-28 | Nippon Steel Corp | Apparatus and method for controlling in-mold molten metal surface level in continuous casting machine |
| CN201693169U (en) * | 2010-06-20 | 2011-01-05 | 武汉钢铁(集团)公司 | Automatic pouring device of tundish |
| CN202527698U (en) * | 2012-04-05 | 2012-11-14 | 上海海能信息科技有限公司 | Automatic control system for motor direct-drive stopper |
| CN102717039A (en) * | 2012-07-09 | 2012-10-10 | 田志恒 | Automatic plate blank continuous casting machine tundish pouring method and automatic pouring system |
Non-Patent Citations (1)
| Title |
|---|
| 沈会良等: "方坯连铸机自动浇铸控制系统", 《冶金自动化》, 30 September 2007 (2007-09-30), pages 531 - 533 * |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104550807B (en) * | 2014-12-24 | 2016-08-24 | 江苏永钢集团有限公司 | Conticaster metering nozzle automatic casting method |
| CN104550807A (en) * | 2014-12-24 | 2015-04-29 | 江苏永钢集团有限公司 | Automatic casting method of sizing nozzle of continuous casting machine |
| CN105204473A (en) * | 2015-09-30 | 2015-12-30 | 芜湖新兴铸管有限责任公司 | Continuous casting billet separating system |
| CN105215308A (en) * | 2015-09-30 | 2016-01-06 | 芜湖新兴铸管有限责任公司 | A kind of continuous casting divides the control method of base system |
| CN105665675A (en) * | 2016-04-07 | 2016-06-15 | 江苏永钢集团有限公司 | Automatic control and alarming system of molten steel liquid level in crystallizer of continuous casting machine |
| CN108145112A (en) * | 2016-12-05 | 2018-06-12 | 上海梅山钢铁股份有限公司 | Sheet billet continuous casting stopper rod flow control automatic casting technique based on liquid automatic control |
| CN107570674A (en) * | 2017-08-08 | 2018-01-12 | 新疆八钢铁股份有限公司 | Billet continuous casting sizing automatic casting control method |
| CN108620547A (en) * | 2018-04-19 | 2018-10-09 | 芜湖新兴铸管有限责任公司 | Continuous casting opens the method poured |
| CN110340322B (en) * | 2019-08-22 | 2022-01-18 | 联峰钢铁（张家港）有限公司 | Method and device for automatic casting in continuous casting |
| CN110340322A (en) * | 2019-08-22 | 2019-10-18 | 联峰钢铁（张家港）有限公司 | A kind of method and apparatus of continuous casting automatic casting |
| CN110883332A (en) * | 2019-11-21 | 2020-03-17 | 中冶赛迪技术研究中心有限公司 | Method and system for detecting water gap blockage on line |
| CN110883332B (en) * | 2019-11-21 | 2023-08-15 | 中冶赛迪技术研究中心有限公司 | Method and system for online detection of nozzle blockage |
| CN111468694B (en) * | 2020-04-10 | 2022-03-11 | 山东钢铁股份有限公司 | Method for starting casting automatically in fixed-diameter casting process of billet continuous casting machine |
| CN111468694A (en) * | 2020-04-10 | 2020-07-31 | 山东钢铁股份有限公司 | Method for starting casting automatically in fixed-diameter casting process of billet continuous casting machine |
| CN111451466A (en) * | 2020-04-16 | 2020-07-28 | 山东莱钢永锋钢铁有限公司 | Automatic casting method and system for continuous casting and casting in steel mill |
| CN112170800A (en) * | 2020-10-04 | 2021-01-05 | 湖南乾源冶金设备有限公司 | Method for detecting liquid level of radioactive molten steel of crystallizer |
| CN113263170A (en) * | 2021-05-13 | 2021-08-17 | 马鞍山钢铁股份有限公司 | Method for remedying bleed-out by pouring cut-off of sizing nozzle of continuous casting machine |
| CN114905021A (en) * | 2022-05-30 | 2022-08-16 | 首钢京唐钢铁联合有限责任公司 | Method for detecting liquid level of molten steel in crystallizer of continuous casting machine |
| CN115415491A (en) * | 2022-08-30 | 2022-12-02 | 广西钢铁集团有限公司 | Automatic tundish casting method in slab continuous casting process |
| CN115415491B (en) * | 2022-08-30 | 2024-03-22 | 广西钢铁集团有限公司 | Automatic tundish casting method in slab continuous casting process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103317110B (en) | 2017-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103317110A (en) | High-efficiency automatic casting starting system based on crystallizer liquid level detection | |
| CN101590994B (en) | Method for controlling liquid quantitative filling | |
| CN110340322B (en) | Method and device for automatic casting in continuous casting | |
| CN103744443B (en) | A kind of large-scale open channel water level automatic control method dynamically regulated based on storage capacity | |
| CN201728346U (en) | Variable-slag-line control device of slab continuous casting submerged nozzle | |
| CN101502337B (en) | Method for controlling model building in leaf moisture-regaining process of tobacco shred production | |
| CN101879775B (en) | Automatic technological parameter-optimizing injection molding machine control system and control method thereof | |
| CN105478737A (en) | Automatic pouring method and system for heat preserving furnace pouring platform | |
| CN112295255B (en) | Intelligent control system and control method for methanol rectification device | |
| CN101693290B (en) | On-line width adjusting method of cystallizer | |
| CN204825109U (en) | A electrolytic pickling solution pH value automatic regulating apparatus for belted steel pickling production | |
| CN101334672B (en) | Crystallizer on-line width modulation system | |
| CN102862094A (en) | Hydraulic servo system controlled by numerical control system | |
| CN104407642A (en) | Temperature control method for continuous casting billet induction heating process, based on iterative learning control | |
| CN108132597B (en) | Design method of differential advanced intelligent model set PID controller | |
| CN108132596B (en) | Design method of differential advanced generalized intelligent internal model set PID controller | |
| CN202975874U (en) | Device applied to PLC (programmable logic controller) and temperature control meter automatic control on temperature of storage battery cast-welding die | |
| CN109870986B (en) | On-line control method of stirred tank reactor based on neural network and data drive | |
| CN102042768B (en) | Positioning control device of spraying gun | |
| CN102689427A (en) | Energy-saving control system of injection molding machine and operating mode of energy-saving control system | |
| CN108859036B (en) | Direct-pressure injection molding machine mold closing control method and system | |
| CN205188101U (en) | Glass kiln liquid level control system based on laser level control appearance and intelligent PID | |
| CN112157790B (en) | Maintenance method and maintenance system for long-line bench formwork and computer-readable storage medium | |
| CN205091633U (en) | Reaction polymeric kettle temperature control system | |
| CN103105860A (en) | Computer liquid level control system and control method of computer liquid level |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210518 Address after: 063020 No.302, 3rd floor, No.11, east side of Kaisan Road, high tech Zone, Tangshan City, Hebei Province Patentee after: TANGSHAN BOHAI METALLURGICAL INTELLIGENT EQUIPMENT Co.,Ltd. Address before: No.11, Kaisan Road, high tech Industrial Park, Tangshan City, Hebei Province 063020 Patentee before: TANGSHAN BOHAI METALLURGY EQUIPMENT Co.,Ltd. |