CN105671331B - Coaxial conductive heavy slab electroslag furnace - Google Patents
Coaxial conductive heavy slab electroslag furnace Download PDFInfo
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- CN105671331B CN105671331B CN201610225196.3A CN201610225196A CN105671331B CN 105671331 B CN105671331 B CN 105671331B CN 201610225196 A CN201610225196 A CN 201610225196A CN 105671331 B CN105671331 B CN 105671331B
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- electrode
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- voussoir
- moving beam
- burner
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
Abstract
The invention discloses a kind of coaxial conductive heavy slab electroslag furnace, including column framework, bottom water tank and transformer, moving beam is installed on the column framework, electrode pendulous device is installed on the moving beam, electrode clamping electric installation is installed on the electrode pendulous device；Vertically uniform parallel is disposed with some conductive copper axles for the column framework inner side, and brush assembly is slidably fitted with the conductive copper axle, and the brush assembly is connected with electrode clamping electric installation；The conductive copper axle lower section is correspondingly arranged on axis identical contact tube respectively, and the contact tube is connected by current switch with the bottom water tank；The transformer is provided with the outlet copper bar and loop line copper bar of some correspondence parallel arrangements, and the outlet copper bar and the conductive copper axle are connected, and the loop line copper bar and the contact tube are connected.The present invention has the advantages that high degree of automation, transformer reactive loss are low, easy to operate.
Description
Technical field
The present invention relates to metal electroslag remelting equipment technical field, more particularly to a kind of coaxial conductive heavy slab electroslag
Stove.
Background technology
Electroslag furnace be using electric current by slag when the resistance heat that produces a kind of smelting of melting is carried out to metal as thermal source
Golden equipment.The content of gas and field trash in steel can be reduced after electroslag remelting, and obtains uniform composition, dense structure, Functionality, quality and appealing design
Different steel ingot.
There is following technical problem in the electroslag furnace of current home or overseas：
(1) when short using the coaxial conductive net of heavy slab steel ingot is smelted, because slab steel ingot profile is huge and be flat,
Existing coaxial conductive technology cannot uniformly offset its magnetic field produced in the case of high current, and short network loss mistake is larger, causes big
The non-power consumption loss of amount, energy consumption wastes high, increased the cost of electroslag ingot.
(2) in traditional large-size electroslag furnace, the pitch adjustment of heavy consutrode is always to disturb the difficulty of electroslag smelting casting quality
Topic, because dummy electrode and consutrode weight and entire length increase, in the case of big packing ratio, during electrode welding very
Hardly possible adjustment in position, influences the quality and performance of the steel ingot of remelting production.
(3) clip position of traditional electrode in electroslag furnace clamping device is on the top of dummy electrode, and electrodes conduct face
Pressure is provided by electrode chucking power, electrode weight than it is larger when the chucking power that needs be very big, thus can cause
Electrodes conduct face stress is excessive and deformation is impaired, reduction of service life.
(4) demoulding (steel ingot that will have been smelted takes out from crystallizer) mode of traditional plate blank electroslag furnace is steel ingot melting
After the completion of, the cooling water pipe of crystallizer is pulled down, the steel ingot vehicle that will be loaded with steel ingot and crystallizer drives to beam worker from melting station
Position, by steel ingot and crystallizer integral hoisting to the platform of outside, fell and opened crystallizer, steel ingot is hung in holding furnace and is protected
Temperature.There are many shortcomings in this stripping means：Operative employee needs to dismantle water pipe in pit, and operation is dangerous；Water in water pipe
Can flow to and ponding is formed in pit；After crystallizer pulls down cooling water pipe, temperature is raised and is easily caused deformation；After the completion of steel ingot melting
The set-up procedure for hanging in holding furnace is cumbersome, and steel ingot traveling time is oversize to be unfavorable for ensureing ingot quality.
The content of the invention
The technical problems to be solved by the invention be to provide a kind of overall construction design rationally, transformer reactive loss it is low,
The coaxial conductive heavy slab electroslag furnace of simple and safe operation.
In order to solve the above technical problems, the technical scheme is that：
Coaxial conductive heavy slab electroslag furnace, including column framework, bottom water tank and transformer, on the column framework
The moving beam that can be moved up and down along column is installed, the column frame roof is provided with rise fall of electrodes transmission system；Institute
State and be provided with moving beam electrode pendulous device, electrode clamping electric installation is installed on the electrode pendulous device；It is described
Vertically uniform parallel is disposed with some conductive copper axles for column framework inner side, and it is total to be slidably fitted with brush on the conductive copper axle
Into the brush assembly is connected with electrode clamping electric installation；The conductive copper axle lower section is correspondingly arranged on axis respectively
Identical contact tube, the contact tube is connected by current switch with the bottom water tank；The transformer is provided with some right
The outlet copper bar and loop line copper bar that should be arranged in parallel, the outlet copper bar and the conductive copper axle are connected, the loop line copper bar and
The contact tube connection.
As preferred technical scheme, line stripper apparatus is additionally included in, the online stripper apparatus is described including being installed on
Hoisting rig on moving beam, is separately installed with hydraulic lifting apparatus, crystallizer outer wall on the column of the column framework
On be provided with the branch brace shoulder being engaged with the hydraulic lifting apparatus.
Used as preferred technical scheme, the electrode pendulous device includes the burner being installed on the moving beam, institute
The two ends for stating burner are respectively arranged with burner voussoir, and the bottom on the moving beam positioned at the burner voussoir is provided with and institute
The driving voussoir of burner voussoir cooperation is stated, roller, the drive are rotatablely equipped between the driving voussoir and the burner voussoir
Dynamic voussoir is connected with servo-electric push rod.
Used as preferred technical scheme, the electrode clamping electric installation includes thering is rectangular aperture and downward opening electricity
Pole clamper, electrode includes dummy electrode and consutrode, and the rectangular aperture of the electrode jaw is stretched into the dummy electrode upper end
It is interior；The top of the electrode jaw is provided with the latch being engaged with the jack of dummy electrode upper end, and the latch is connected with wears pin
Oil cylinder；The bottom of the electrode jaw is provided with floating electric installation and driving clamping device.
Used as preferred technical scheme, the floating electric installation includes four groups of conductions for being supported by butterfly spring respectively
Block, the conducting block be connected with the brush assembly by being flexible coupling.
Used as preferred technical scheme, the driving clamping device includes butterfly spring clamping cylinder, the butterfly spring clamping cylinder
Telescopic end be connected with the lower end of the electrode jaw.
Used as preferred technical scheme, the rise fall of electrodes transmission system includes being installed on the column framework top
Two servomotors, the output end of the servomotor is connected with ball-screw, and the ball-screw is mobile horizontal with described
Beam is connected；Absolute value encoder is installed on the ball-screw.
Used as preferred technical scheme, the column framework includes four root posts, edge is separately installed with the column
Embedded guide rail, is provided with some groups of directive wheels being engaged with the guide rail on the moving beam.
By adopting the above-described technical solution, the invention has the advantages that：
(1) electroslag furnace is smelted into electric current using many coaxial conductives and constitutes parallel arrangement electrically conducting manner with loop current, offset
Electric current passes through the magnetic field produced during conductor, reduces the reactive loss of transformer, successfully overcomes in the prior art because of slab
Steel ingot profile is huge and the problem in its magnetic field produced in the case of high current cannot be uniformly offset for flat, is smelting 40 tons of plates
Actual pressure drop during base steel ingot is in below 10V；
(2) by use the online stripper apparatus, using hydraulic system power it is powerful the characteristics of first by crystallizer and steel
Ingot disengages certain distance, is then again hung out crystallizer completely by the hoisting rig on moving beam, completes stripper
Sequence, the founding garage for being loaded with steel ingot sails to preparation station, and steel ingot is hung in into holding furnace insulation, and operational security is good, easy to operate；
Hydraulic lifting apparatus can be accomplished to be synchronized with the movement by hydraulic balance system, it is ensured that the steady demoulding of crystallizer；
(3) by use the electrode pendulous device, control burner two ends bottom driving voussoir movement, make again with
The burner on inclined-plane produces swing, drives and multiple rows of roller is housed on voussoir, and the movement of voussoir is changed into the rolling of roller, and rolling friction rubs
Power very little is wiped, drive device can be made easily to promote voussoir to move, drive the inclined-plane that is moved through of voussoir to be converted to upward pushing away
Power, makes burner produce swing, so as to adjust the angle of electrode, it is ensured that electrode is parallel with crystallizer inwall；
(4) electric installation, pressure and electrode holder that conducting block and electrodes conduct face are subject to are clamped by using the electrode
Holding force is unrelated, the clamping of electrode is to tangle electrode by wearing pin oil cylinder and then clamped by disc spring clamping cylinder again, and electrode is led
It is electric then be to provide pressure by butterfly spring on floating electric installation, it is to avoid when heavier electrode is clamped because chucking power is excessive
And damage conducting surface by pressure, and electrodes conduct contact position in dummy electrode bottom, effectively reduce the length of short net, further drop
Low reactive loss.
Brief description of the drawings
The following drawings is only intended to, in schematic illustration and explanation is done to the present invention, not delimit the scope of the invention.Wherein：
Fig. 1 is the main structure diagram of the embodiment of the present invention；
Fig. 2 is the side structure schematic view of the embodiment of the present invention；
Fig. 3 is the structural representation of the short net of many coaxial conductives；
Fig. 4 is the structural representation of electrode pendulous device；
Fig. 5 is the structural representation that electrode clamps electric installation；
Fig. 6 is the structural representation of online stripper apparatus.
In figure：101- column frameworks；102- electrodes；103- crystallizers；104- bottoms water tank；105- transformers；106- is moved
Dynamic crossbeam；107- conductive copper axles；108- brush assemblies；109- contact tubes；110- current switches；111- slag baths；112- slabs
Steel ingot；200- rise fall of electrodes transmission systems；201- servomotors；202- reductors；203- ball-screws；300- electrodes swing dress
Put；301- burners；302- burner voussoirs；303- drives voussoir；304- rollers；305- servo-electric push rods；400- electrodes are clamped
Electric installation；401- rectangular apertures；402- electrode jaws；403- latches；404- wears pin oil cylinder；405- butterfly springs；406-
Conducting block；407- butterfly spring clamping cylinders；The online stripper apparatus of 500-；501- hoisting rigs；502- hydraulic lifting apparatus；503- branch
Brace shoulder；504- founding cars.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is expanded on further.In the following detailed description, only by explanation
Mode describes some one exemplary embodiments of the invention.Undoubtedly, one of ordinary skill in the art will recognize,
In the case of without departing from the spirit and scope of the present invention, described embodiment can be repaiied with a variety of modes
Just.Therefore, accompanying drawing and description are inherently illustrative, are not intended to limit the scope of the claims.
As shown in Figures 1 to 6, coaxial conductive heavy slab electroslag furnace, including column framework 101, electrode 102 (including
Dummy electrode and consutrode), crystallizer 103, bottom water tank 104 and transformer 105, being provided with the column framework 101 can
The moving beam 106 moved up and down along column, the top of the column framework 101 is provided with rise fall of electrodes transmission system 200；Institute
State and electrode pendulous device 300 is installed on moving beam 106, electrode clamping is installed conductive on the electrode pendulous device 300
Device 400；Vertically uniform parallel is disposed with some conductive coppers to the inner side of column framework 101 around the crystallizer 103
Axle 107, is slidably fitted with brush assembly 108 on the conductive copper axle 107, the brush assembly 108 is led with electrode clamping
Electric installation 400 is connected；The lower section of the conductive copper axle 107 is correspondingly arranged on axis identical contact tube 109, the conduction respectively
Copper pipe 109 is connected by current switch 110 (high-current switch being used, up to 44000A) with the bottom water tank 104；The transformation
Device 105 is provided with the outlet copper bar and loop line copper bar of some correspondence parallel arrangements, and the outlet copper bar and the conductive copper axle 107 connect
Connect, the loop line copper bar and the contact tube 109 are connected, many coaxial conductives are thus formed between transformer and electroslag furnace short
Net.
Smelting current direction is：Transformer → outlet copper bar → conductive copper axle → brush assembly → electrode clamping electric installation
Slag bath → slab steel ingot in → dummy electrode → consutrode → crystallizer；
Loop current is flowed to：Slab steel ingot → bottom water tank → current switch → contact tube → loop line copper bar → transformation
Device.
Electroslag furnace is smelted into the electrically conducting manner that electric current constitutes parallel arrangement with loop current using many coaxial conductives, is counteracted
Electric current passes through the magnetic field produced during conductor, reduces the reactive loss of transformer, successfully overcomes in the prior art because of slab steel
Ingot profile is huge and the problem in its magnetic field produced in the case of high current cannot be uniformly offset for flat, it is demonstrated experimentally that in smelting
Actual pressure drop during 40 tons of slab steel ingots of refining is in below 10V.
With reference to Fig. 4, the electrode pendulous device 300 includes the burner 301 being installed on the moving beam 106, described
The two ends of burner 301 are respectively arranged with burner voussoir 302, positioned at the bottom of the burner voussoir 302 on the moving beam 106
The driving voussoir 303 coordinated with the burner voussoir 302 is provided with, 303 pieces of the wedge of driving is between the burner voussoir 302
Roller 304 is rotatablely equipped with, the driving voussoir 303 is connected with servo-electric push rod 305.By controlling two band voussoirs of burner
Servo-electric push rod swing realizing burner, just as lift shoulder pole, the flexible drive of servo-electric push rod drives voussoir
It is mobile, make to produce swing again with the burner on inclined-plane.Drive and multiple rows of roller is housed on voussoir, the movement of voussoir is changed into roller
Roll, rolling friction frictional force very little can make servo-electric push rod easily promote voussoir to move, voussoir is moved through inclined-plane
Upward thrust is converted to, burner is produced swing.Servo-electric push rod accurately controls the angle of burner swing, so as to adjust
The angle of consutrode, it is ensured that consutrode is parallel with crystallizer inwall, improves electroslag remelting quality and performance.
With reference to Fig. 5, the electrode clamping electric installation 400 includes thering is rectangular aperture 401 and downward opening electrode holder
Stretch into the rectangular aperture 401 of the electrode jaw 402 holder 402, dummy electrode upper end；The electrode jaw 402 it is upper
Portion is provided with the latch 403 being engaged with the tubaeform jack of dummy electrode upper end, and the latch 403 is connected with wears pin oil cylinder 404；Institute
The bottom for stating electrode jaw 402 is provided with floating electric installation and driving clamping device.The floating electric installation includes four
The conducting block 406 that group is supported by butterfly spring 405 respectively, the conducting block 406 connect with the brush assembly 108 by being flexible coupling
Connect.The driving clamping device includes butterfly spring clamping cylinder 407, telescopic end and the electrode of the butterfly spring clamping cylinder 407
The lower end connection of clamper 402.The pressure that conducting surface is subject in the present apparatus is unrelated with electrode chucking power, and the clamping of electrode is to pass through
Pin oil cylinder is worn to tangle electrode and then clamped by disc spring clamping cylinder again, and the conduction of electrode is then by floating electric installation
Butterfly spring provides pressure, it is to avoid because chucking power is excessive damage conducting surface, and electrodes conduct by pressure when heavier electrode is clamped
Contact position in dummy electrode bottom, so as to effectively reduce the length of short net.
With reference to Fig. 6, line stripper apparatus 500 is additionally included in, the online stripper apparatus 500 includes being installed on the mobile horizontal stroke
Hoisting rig 501 on beam 106, hydraulic lifting apparatus 502, hydraulic pressure are separately installed with the column of the column framework 101
Lifting device includes the known features such as hydraulic cylinder and lift arm, repeats no more；Be provided with the outer wall of the crystallizer 103 with it is described
The branch brace shoulder 503 that hydraulic lifting apparatus 502 are engaged.During the demoulding, using hydraulic system power it is powerful the characteristics of first by crystallizer
103 disengage certain distance with slab steel ingot 112, then again by the hoisting rig 501 on moving beam 106 by crystallizer
Hang out completely, complete stripping process；Then the founding car 504 for being loaded with steel ingot drives to preparation station, and steel ingot is hung in into holding furnace
Insulation, job safety, convenience.
Referring again to Fig. 1 and Fig. 2, the rise fall of electrodes transmission system 200 includes being installed on the top of column framework 101
Two servomotors 201, the output end of the servomotor 201 is connected with ball-screw 203 by reductor 202,
The ball-screw 203 is connected with the moving beam 106；100 tons of elevating mechanism load-bearing, employs bi-motor reductor
Redundancy Design, single motor can meet production requirement, it is ensured that the reliability of equipment, it is ensured that electroslag production it is continuous
Property；Absolute value encoder is installed on the ball-screw 203, is fed back by encoder position and is accurately controlled electrode position.
In the present embodiment, body of heater uses 4 column frame formula structures, and physical dimension is big, and manufacture difficulty is high.Body of heater is high by about 16
Rice, wide 7 meters, long 8 meters, pit is deep 2.5 meters.Inserted guide rail is installed on 4 root posts, all column machined surfaces (including guide rail
Face) it is an overall processing shaping.
Moving beam is welding structural element, and size and weight are all very big.There are 16 groups of directive wheels to be arranged on moving beam, move
Dynamic crossbeam can be moved up and down along 4 root post guide pass, and adjustment directive wheel can be adjusted between moving beam and column guide rail level
Gap, to ensure that moving beam operates steadily up and down.
This equipment is provided with advanced weighing system, 4 sets of Weighing cell modules is provided with moving beam, with title
The features such as accuracy of measurement is high, easy for installation, structure is novel；Steel ingot vehicle possesses lifting, translation, traversing, spinfunction, and steel ingot vehicle is weighed
150 tons；High-current switch is arranged on steel ingot vehicle, and high-current switch controls folding by disc spring hydraulic cylinder.Transformer is using single-phase
Power frequency power supply mode, is T-shaped transformer, 1 grade of 1V；
In order to meet the requirement that plate blank electroslag furnace produces high-quality steel, atmosphere protection system, computer control are further equipped with
System processed, many advantages, such as computer control system possesses reliability, stability, continuity, process reproducibility, Redundant Control,
With high degree of automation, control the various features, energy such as steady, sensitivity is high, easy to operate, durable in use, trackability is strong
It is enough to realize automatically controlling with controlling to be combined manually, so that it is guaranteed that fusion process is uninterrupted, fully meet the smelting of large power long time
Refining is required.
Schematical specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, done equivalent variations and modification on the premise of design of the invention and principle is not departed from,
The scope of protection of the invention should be belonged to.
Claims (6)
1. coaxial conductive heavy slab electroslag furnace, including column framework, bottom water tank and transformer, pacify on the column framework
Equipped with the moving beam that can be moved up and down along column, the column frame roof is provided with rise fall of electrodes transmission system；It is special
Levy and be：Electrode pendulous device is installed on the moving beam, electrode clamping is installed conductive on the electrode pendulous device
Device；Vertically uniform parallel is disposed with some conductive copper axles for the column framework inner side, and peace is slided on the conductive copper axle
Equipped with brush assembly, the brush assembly is connected with electrode clamping electric installation；The conductive copper axle lower section corresponds to respectively
Axis identical contact tube is provided with, the contact tube is connected by current switch with the bottom water tank；The transformer
The outlet copper bar and loop line copper bar of some correspondence parallel arrangements are provided with, the outlet copper bar and the conductive copper axle are connected, described
Loop line copper bar and the contact tube are connected；
The electrode pendulous device includes the burner being installed on the moving beam, and the two ends of the burner are respectively arranged with stove
Head voussoir, the driving wedge with burner voussoir cooperation is provided with the moving beam positioned at the bottom of the burner voussoir
Block, is rotatablely equipped with roller between the driving voussoir and the burner voussoir, the driving voussoir is connected with servo-electric and pushes away
Bar.
2. coaxial conductive heavy slab electroslag furnace as claimed in claim 1, it is characterised in that：Line stripper apparatus is additionally included in,
The online stripper apparatus includes the hoisting rig being installed on the moving beam, on the column of the column framework respectively
Hydraulic lifting apparatus are installed, the branch brace shoulder being engaged with the hydraulic lifting apparatus is provided with crystallizer outer wall.
3. coaxial conductive heavy slab electroslag furnace as claimed in claim 1, it is characterised in that：The electrode clamps electric installation
Including with rectangular aperture and downward opening electrode jaw, electrode includes dummy electrode and consutrode, on the dummy electrode
Stretch into the rectangular aperture of the electrode jaw at end；The top of the electrode jaw is provided with the jack phase with dummy electrode upper end
The latch of cooperation, the latch is connected with wears pin oil cylinder；The bottom of the electrode jaw is provided with floating electric installation and folder
Tight drive device.
4. coaxial conductive heavy slab electroslag furnace as claimed in claim 3, it is characterised in that：The floating electric installation includes
Four groups of conducting blocks for being supported by butterfly spring respectively, the conducting block be connected with the brush assembly by being flexible coupling.
5. coaxial conductive heavy slab electroslag furnace as claimed in claim 4, it is characterised in that：The driving clamping device includes
Butterfly spring clamping cylinder, the telescopic end of the butterfly spring clamping cylinder is connected with the lower end of the electrode jaw.
6. coaxial conductive heavy slab electroslag furnace as claimed in claim 1, it is characterised in that：The rise fall of electrodes transmission system
Two servomotors including being installed on the column framework top, the output end of the servomotor is connected with ball
Leading screw, the ball-screw is connected with the moving beam；Absolute value encoder is installed on the ball-screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225196.3A CN105671331B (en) | 2016-04-12 | 2016-04-12 | Coaxial conductive heavy slab electroslag furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225196.3A CN105671331B (en) | 2016-04-12 | 2016-04-12 | Coaxial conductive heavy slab electroslag furnace |
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| CN105671331A CN105671331A (en) | 2016-06-15 |
| CN105671331B true CN105671331B (en) | 2017-06-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106086448B (en) * | 2016-08-02 | 2017-09-12 | 合智熔炼装备（上海）有限公司 | Electroslag furnace brush variable-ratio motion and control method |
| CN106756080A (en) * | 2017-02-20 | 2017-05-31 | 潍坊市众诚佳合环保科技股份有限公司 | Coaxial conductive electroslag refining furnace crystallizer |
| CN107604174B (en) * | 2017-10-23 | 2020-08-25 | 沈阳真空技术研究所有限公司 | Electrode transmission system of vacuum cooling crucible skull furnace |
| CN108118159B (en) * | 2017-11-21 | 2019-02-22 | 沈阳金正冶金技术有限公司 | A kind of novel consumable metallurgical furnace conductive material bar |
| DE102018103312B4 (en) * | 2018-02-14 | 2019-08-22 | Ald Vacuum Technologies Gmbh | Remelting plant and method for operating a remelting plant |
| CN115910638B (en) * | 2022-09-07 | 2023-11-14 | 中国科学院电工研究所 | High-current loop on-off switching mechanism |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2179219Y (en) * | 1994-01-28 | 1994-10-12 | 本溪钢铁公司 | Hydraulic ingot stripper |
| DE19921161B4 (en) * | 1999-05-07 | 2011-01-20 | Ald Vacuum Technologies Ag | Electroslag remelting plant with a mold and a hood |
| CN203999759U (en) * | 2014-07-30 | 2014-12-10 | 潍坊市众诚佳合环保科技股份有限公司 | Coaxial atmosphere protected electro-slag re-melting stove |
| CN104561573B (en) * | 2014-12-30 | 2016-08-24 | 朱兴发 | Multistation coaxial electrical slag hearth short-net device |
| CN205528968U (en) * | 2016-04-12 | 2016-08-31 | 潍坊亚东冶金设备有限公司 | With axle guide TV university template base electroslag furnace |
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Denomination of invention: Coaxial conductive large slab electroslag furnace Effective date of registration: 20220519 Granted publication date: 20170620 Pledgee: Postal Savings Bank of China Limited Anqiu sub branch Pledgor: WEIFANG YADONG METALLURGICAL EQUIPMENT Co.,Ltd. Registration number: Y2022980005895 |
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Denomination of invention: Coaxial conductive large slab electroslag furnace Effective date of registration: 20230522 Granted publication date: 20170620 Pledgee: Postal Savings Bank of China Limited Anqiu sub branch Pledgor: WEIFANG YADONG METALLURGICAL EQUIPMENT Co.,Ltd. Registration number: Y2023980041267 |
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