CN104028717B - A kind of electromagnetic eddy flow continuous cast method - Google Patents
A kind of electromagnetic eddy flow continuous cast method Download PDFInfo
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- CN104028717B CN104028717B CN201410254236.8A CN201410254236A CN104028717B CN 104028717 B CN104028717 B CN 104028717B CN 201410254236 A CN201410254236 A CN 201410254236A CN 104028717 B CN104028717 B CN 104028717B
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- eddy flow
- electromagnetic eddy
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Abstract
A kind of electromagnetic eddy flow continuous cast method, belongs to smelting continuous casting technology field, carries out according to the following steps：（1）The electromagnetic eddy flow device used is 180o semi-annulars, split 360o ring-like, horseshoe type or improves horseshoe type；（2）Electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the submersed nozzle between tundish and crystallizer, or is the long nozzle between ladle and tundish；（3）When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, rotary electromagnetic field is applied to the molten steel in the mouth of a river.The present invention can be used generally for round billet, square billet and the various process conditions of slab, can accurately, the design of optimization, can generally be used for round billet, square billet and the various process conditions of slab, it is simple to operation without the original continuous casting installation for casting of transformation.
Description
Technical field
The invention belongs to smelt continuous casting technology field, more particularly to a kind of electromagnetic eddy flow continuous cast method.
Background technology
Submersed nozzle goes out to flow main flow and would generally swung phenomenon in casting process, that is, water in crystallizer occurs
Mouth goes out to flow the uneven bias current of size or so, flowing and temperature distributing disproportionation in crystallizer as a result can be caused even, so as to cause liquid level
A series of problems, such as Local cooling, bleed-out, slab surface crack；Bias current also results in liquid fluctuating, is drawn in particular with continuous casting
Base speed is improved, and the mouth of a river goes out to flow inhomogeneities aggravation, liquid fluctuating aggravation, so as to limit the raising of pulling rate；Bias current is also resulted in
Occur being vortexed the shearing slag near slag and short side near the mouth of a river, produce serious slab quality defect：Such as subcutaneous pin hole, subcutaneously
Slag inclusion, the increase of the line defect of coiled sheet etc.；But because it is following the reason for etc., the generation of this bias current is difficult to avoid that：
（1）Inertia in molten steel horizontal direction：Molten steel has certain speed in the horizontal direction when entering submersed nozzle
Degree so that molten steel skewness on the cross section of the mouth of a river, so that the molten steel that the mouth of a river goes out stream produces bias current.
（2）Slide gate nozzle is controlled：The slide gate nozzle of molten steel flow is controlled in continuous casting generally all in half-open state, institute
It is not vertical with the molten steel flow direction for causing to be injected downwardly into submersed nozzle, but obliquely.For this reason that, leaching
Enter in the formula mouth of a river molten steel and can be swung as snake and enter crystallizer while flowing downward.And this flowing is not
Steady Flow, i.e. molten steel are injected into crystallizer by unsteady stream.
（3）Field trash dross：Field trash present in molten steel can be adsorbed when by submersed nozzle in mouth of a river inner surface,
Part is grown up and dross so that molten steel skewness on the cross section of the mouth of a river, forms bias current.
（4）The reason for operation：The situation of misalignment occurs in submersed nozzle center and the center of ladle upper nozzle, also can
Cause bias current.
SUMITOMO CHEMICAL metal company etc. is developing mechanical eddy flow downspout in recent years；Placed in the inside of submersed nozzle
Refractory material rotating vane, the potential energy flowed into using molten steel from mouth of a river top forms rotational flow when by blade；Experiment
Prove, the molten steel mouth of a river of eddy flow state goes out stream uniformly, stably, improves flowing and Temperature Distribution in crystallizer, and substantially reduce
Liquid fluctuating；Current Sumitomo Metal Industries have carried out commodity production, improve pulling rate, significantly improve casting billet surface and internal soundness.
But this method has major defect：One is refractory material helical blade washes away that the life-span is low due to molten steel, and molten steel inclusion easily exists
The mouth of a river not only cost raising is changed in absorption so as to block, often on helical blade, more has a strong impact on production；Two be this side
Under method, the convolution speed and decrease speed of molten steel are directly proportional, in low speeds flow（Such as low speed casting）When, it is impossible to effectively returned
Eddy flow is moved, that is, is opening the stage of pouring, and changes ladle stage and casting latter stage, and molten steel can not obtain necessary swirling flow, its uniform temperature
Field is spent, the function such as removal of inclusions can drastically deteriorate；Further, this cyclone mode is unadjustable, it is difficult to which adapting to different process will
Ask, therefore application is restricted.
For above-mentioned mechanical eddy flow downspout, the Chinese patent of Application No. 200510047290.6 discloses a kind of electromagnetism rotation
Flowing water mouthful, installs rotary electromagnetic field with the molten steel generation eddy flow in the mouth of a river around submersed nozzle, can reach mechanical eddy flow
The same effect in the mouth of a river, and do not block and life problems；Swirl strength is more flexibly adapted to different steel grades and company simultaneously
The requirement of casting blank shape；Basic research shows that electromagnetic eddy flow downspout can produce the rotation of mechanical eddy flow downspout on an equal basis in the mouth of a river
Intensity of flow, it is expected to obtain equal metallurgical effect；But from unlike mechanical eddy flow downspout, electromagnetic eddy flow downspout need in water
Arrangement electromagnetic eddy flow device around mouthful；And limited by continuous casting process, the surrounding space of crystallizer is narrow and small, tundish and crystallizer
Between space it is also limited；The position that electromagnetic eddy flow device is placed around the mouth of a river, the live move mode of electromagnetic eddy flow device, just
When electromagnetic eddy flow apparatus structure will also determine that can electromagnetic eddy flow downspout effectively produce electromagnetic field and act on molten steel in the mouth of a river,
Continuous casting can be smoothed out, there is presently no related research report.
The content of the invention
For existing electromagnetic eddy flow downspout in problem present on practical technique, the present invention provides a kind of electromagnetic eddy flow continuous casting
Method, under conditions of casting apparatus is not changed, independent travel mechanism and electromagnetic eddy flow device is installed near crystallizer, is made
Electromagnetic eddy flow device is quickly moved to around the mouth of a river when needing work, implements electromagnetic eddy flow continuous casting.
The electromagnetic eddy flow continuous cast method of the present invention comprises the following steps：
1st, the electromagnetic eddy flow device used is 180o semi-annulars, split 360o ring-like, horseshoe type or improves horseshoe type；When
When electromagnetic eddy flow device is split 360o ring-like, electromagnetic eddy flow device is divided between Part I and Part II, two parts
One end be hinged, the other end is respectively equipped with supporting locking device；When electromagnetic eddy flow device is improves horseshoe type, electromagnetic eddy flow
Two sides front end of device carries elbow；
2nd, electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the immersion between tundish and crystallizer
The formula mouth of a river, or be the long nozzle between ladle and tundish；Described mobile device is the slip being fixed on tundish chassis
Take turns mechanism, or the movable pulley mechanism being fixed on mobile trolley used；
When the 3rd, carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, to electromagnetic eddy flow device
Energization makes it produce rotary electromagnetic field, and then applies rotary electromagnetic field to the molten steel in the mouth of a river, the molten steel in the mouth of a river is produced rotation
Turn, obtain the uniform mouth of a river and go out stream.
In the above method, electromagnetic eddy flow device is carried out moves vertically and horizontally according to the requirement of production process.
In the above method, when electromagnetic eddy flow device is 180o semi-annulars, horseshoe type or improves horseshoe type, electromagnetic eddy flow
Device is directly moved to around the mouth of a river by mobile device, electromagnetic eddy flow device is looped around outside the mouth of a river；When electromagnetic eddy flow dress
Be set to split 360o it is ring-like when, first the locking device of electromagnetic eddy flow device is opened, after being moved to around the mouth of a river, by locking device
It is closed and locked, electromagnetic eddy flow device is looped around outside the mouth of a river.
Above-mentioned electromagnetic eddy flow device is provided with water collar or air-cooled set, and wherein water collar is outer water collar or interior water collar.
The magnetic induction intensity for the rotary electromagnetic field that above-mentioned electromagnetic eddy flow device is produced when working is 10-4~ 1T, rotating electromagnetic
The frequency of field is in 0.1 ~ 500Hz.
In the above method, when mobile device is the movable pulley mechanism being fixed on tundish chassis cantilever, electromagnetic eddy flow
Device is located at the opposite of artificial operative position at crystallizer.
Movable pulley mechanism in the above method includes cantilever, pulley and support；Electromagnetic eddy flow device is fixed on support, branch
Frame is fixed on pulley, and pulley is slidably connected with cantilever；Cantilever is fixed on tundish chassis or mobile trolley used crossbeam.
Above-mentioned electromagnetic eddy flow device uses split 360o ring-like, horseshoe type or improves horseshoe type structure, in order to make electricity
Magnetic rotation stream device ring around inner space magnetic field it is more uniform, magnetic induction intensity is bigger.
At least one electromagnetic eddy flow device can quickly be moved to around submersed nozzle or long nozzle and closed by the method for the present invention
Right position is put, and carries out electromagnetic eddy flow continuous casting, in continuous casting failure, it is necessary to by electromagnetic eddy flow device when carrying out outlet replacing or stopping continuous casting
It is moved away from the mouth of a river rapidly；This method is not only applicable to the submersed nozzle between tundish and crystallizer, be also applied for ladle with
The long nozzle of middle parlor, so as to reach clean molten steel, mentions molten steel recovery rate, saves the effect of refractory material.
The move mode of electromagnetic eddy flow device and the contour structures of electromagnetic eddy flow device are key contents；Electromagnetic eddy flow device
Travel mechanism move mode can be manually, electrically or by way of hydraulic pressure etc., by the movement of movable pulley mechanism so as to
Electromagnetic eddy flow device is moved quickly into forward the operating position around the mouth of a river, can also be filled electromagnetic eddy flow by same mode
Put and move quickly into safe standby position backward, can now carry out common continuous casting；The chassis of mobile device can also be in itself
Wheeled either rail mounted, can left and right for operative employee（When chassis is located at crystallizer side）Or front and rear shifting
It is dynamic（When chassis is located at crystallizer rear or front）, move mode when mobile device is located at crystallizer side is by manual etc.
Mode moves left and right the chassis positioned at crystallizer side, and the swirl-flow devices being fixed on chassis are moved quickly into around the mouth of a river
Or withdraw, move mode can also be the movable pulley mechanism on the cantilever either cantilever on mobile trolley used to move eddy flow dress
Put；When mobile device is located at crystallizer rear or front, mobile trolley used or cantilever or movable pulley mechanism can be made to be moved before and after making
It is dynamic.
The structure of the electromagnetic eddy flow device of electromagnetic eddy flow continuous metal cast process is 180o semi-annulars, and split 360o is ring-like, horseshoe type
Structure improves horseshoe type structure, and the structure that this single-open can either be open is conducive to the quick shifting of electromagnetic eddy flow device
Move to around the mouth of a river, and be conducive to the observation to crystallizer menisci and push away slag, choose the routine operations such as slag circle；Be conducive to electromagnetism
The smooth implementation of eddy flow continuous casting；For split 360o ring type structure electromagnetic eddy flow devices, the electromagnetic eddy flow dress of two semi-circular shape
The side put is hinged by hinge, and opposite side can be opened, and allows the mouth of a river to enter behind swirl-flow devices center and closes, is used in combination
Certain mode is fixed, and makes it to open.
The present invention can generally be used for round billet, square billet and the various process conditions of slab, can accurately, optimize set
Meter, therefore can generally be used for round billet, square billet and the various process conditions of slab, can without transforming original continuous casting installation for casting,
Only need to be in the side or rear of crystallizer or the independent mobile device of front installation and electromagnetic eddy flow device, equipment is simply easy
Operation.
Brief description of the drawings
Fig. 1 be the embodiment of the present invention 1 in electromagnetic eddy flow continuous metal cast process schematic device；
Fig. 2 is Fig. 1 side view；
Fig. 3 be the embodiment of the present invention 2 in electromagnetic eddy flow continuous metal cast process schematic device；
Fig. 4 is Fig. 3 side view；
Fig. 5 is the ring-like electromagnetic eddy flow apparatus structure schematic diagrams of split 360o in the embodiment of the present invention；Wherein right figure is lock
Tight device present invention looks up structural representation；
Fig. 6 is the 180o semi-annular electromagnetic eddy flow apparatus structure schematic diagrams in the embodiment of the present invention；
Fig. 7 is the horseshoe type electromagnetic eddy flow apparatus structure schematic diagram in the embodiment of the present invention；
Fig. 8 is the improvement horseshoe type electromagnetic eddy flow apparatus structure schematic diagram in the embodiment of the present invention；
Fig. 9 is the horseshoe type electromagnetic eddy flow device action process schematic in present invention implementation；Wherein left figure is armed bit
Put, right figure is operating position；
Figure 10 is the ring-like electromagnetic eddy flow device action process schematics of split 360o in present invention implementation；Wherein left figure is
Standby position, right figure is operating position；
In figure, 1, tundish, 2, tundish crossbeam cantilever, 3, pulley, 4, support, 5, tundish chassis crossbeam, 6, middle
Bag chassis, 7, submersed nozzle, 8, horseshoe type electromagnetic eddy flow device, 9, crystallizer cover plate, 10, crystallizer, 11, molten steel, 12, move
Dynamic chassis crossbeam, 13, mobile trolley used crossbeam cantilever, 14, the ring-like electromagnetic eddy flow devices of split 360o, 15, mobile trolley used, 16, hinge
Spindle, 17, Part I, 18, Part II, 19, locking device.
Embodiment
The crystallizer used in the embodiment of the present invention is plate slab crystallizer, square blank crystallizer or round mold.
The locking device of the ring-like electromagnetic eddy flow devices of split 360o is by the axle on Part I in the embodiment of the present invention
Nut in bar, the screwed fix bar on Part II, the lock being hinged with axostylus axostyle and fix bar is constituted；Need
It is when locking, axostylus axostyle is close with fix bar, lock is pressed in fix bar, and is clamped by nut.
Embodiment 1
The electromagnetic eddy flow device used is horseshoe type, and structure is as shown in Figure 7；
Electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the immersion between tundish and crystallizer
The mouth of a river；Described mobile device is the movable pulley mechanism being fixed on tundish chassis；
When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, the molten steel in the mouth of a river is applied
Plus rotary electromagnetic field, the molten steel in the mouth of a river is produced rotation, obtain the uniform mouth of a river and go out stream；
Electromagnetic eddy flow device is directly moved to around the mouth of a river by mobile device, electromagnetic eddy flow device is looped around outside the mouth of a river
Portion；The course of work is as shown in Figure 9；
Electromagnetic eddy flow device is provided with water collar；The magnetic induction intensity of electromagnetic eddy flow device is 10-4T, frequency is in 500Hz；
Electromagnetic eddy flow device is located at the opposite of artificial operative position at crystallizer；
Movable pulley mechanism includes tundish crossbeam cantilever, pulley and support；Electromagnetic eddy flow device is fixed on support, support
It is fixed on pulley, pulley is slidably connected with tundish crossbeam cantilever；Cantilever is fixed on tundish chassis crossbeam, and structure is as schemed
Shown in 1 and 2.
Embodiment 2
The electromagnetic eddy flow device used is ring-like for split 360o, and structure is as shown in Figure 5；The ring-like electromagnetic eddy flow dresses of split 360o
Put and be divided into Part I and Part II, one end between two parts is hinged, the other end is respectively equipped with supporting locking device；
Electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the immersion between tundish and crystallizer
The mouth of a river；Described mobile device is the movable pulley mechanism being fixed on mobile trolley used；
When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, the molten steel in the mouth of a river is applied
Plus rotary electromagnetic field, the molten steel in the mouth of a river is produced rotation, obtain the uniform mouth of a river and go out stream；
When electromagnetic eddy flow device is in standby position, the locking device of electromagnetic eddy flow device is opened；When needing to water
When mouth molten steel applies magnetic field, electromagnetic eddy flow device is moved to around the mouth of a river, locking device is closed and locked, fill electromagnetic eddy flow
Put and be looped around outside the mouth of a river；The course of work is as shown in Figure 10；
Electromagnetic eddy flow device is provided with water collar；The magnetic induction intensity of electromagnetic eddy flow device is in 0.5T, and frequency is in 0.1Hz；
Movable pulley mechanism includes mobile trolley used crossbeam cantilever, pulley and support；Electromagnetic eddy flow device is fixed on support, branch
Frame is fixed on pulley, and pulley is slidably connected with mobile trolley used crossbeam cantilever；Mobile trolley used crossbeam cantilever is fixed on mobile trolley used
Crossbeam on；Structure is as shown in Figures 3 and 4.
Embodiment 3
The electromagnetic eddy flow device used is 180o semi-annular, and structure is as shown in Figure 6；
Electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the long nozzle between ladle and tundish；
Described mobile device is the movable pulley mechanism being fixed on mobile trolley used；
When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, the molten steel in the mouth of a river is applied
Plus rotary electromagnetic field, the molten steel in the mouth of a river is produced rotation, obtain the uniform mouth of a river and go out stream；
Electromagnetic eddy flow device is provided with air-cooled set；The magnetic induction intensity of electromagnetic eddy flow device is 10-1T, frequency is in 50Hz；
Movable pulley mechanism includes cantilever, pulley and support；Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley
On, pulley is slidably connected with cantilever；Cantilever is fixed on mobile trolley used crossbeam.
Embodiment 4
The electromagnetic eddy flow device used is improves horseshoe type, and two sides front end of electromagnetic eddy flow device carries elbow, knot
Structure is as shown in Figure 8；
Electromagnetic eddy flow device is fixed on the mobile device；The described mouth of a river is the long nozzle between ladle and tundish；
Described mobile device is the movable pulley mechanism being fixed on mobile trolley used；
When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, the molten steel in the mouth of a river is applied
Plus rotary electromagnetic field, the molten steel in the mouth of a river is produced rotation, obtain the uniform mouth of a river and go out stream；
Electromagnetic eddy flow device is provided with water collar；The magnetic induction intensity of electromagnetic eddy flow device is in 1T, and frequency is in 1Hz；
Movable pulley mechanism includes cantilever, pulley and support；Electromagnetic eddy flow device is fixed on support, and support is fixed on pulley
On, pulley is slidably connected with cantilever；Cantilever is fixed on mobile trolley used crossbeam.
Claims (3)
1. a kind of electromagnetic eddy flow continuous cast method, it is characterised in that carry out according to the following steps：
（1）The electromagnetic eddy flow device used is ring-like for split 360o, and electromagnetic eddy flow device is divided into Part I and Part II, two
One end between part is hinged, and the other end is respectively equipped with supporting locking device；Electromagnetic eddy flow device is provided with air-cooled set；
（2）Electromagnetic eddy flow device is fixed on the mobile device；The mouth of a river is the submersed nozzle between tundish and crystallizer, or
For the long nozzle between ladle and tundish；Described mobile device is the movable pulley mechanism being fixed on tundish chassis, or
It is fixed on the movable pulley mechanism on mobile trolley used；Described movable pulley mechanism includes cantilever, pulley and support；Electromagnetic eddy flow device
It is fixed on support, support is fixed on pulley, pulley is slidably connected with cantilever；Cantilever is fixed on tundish chassis or mobile station
On the crossbeam of car；The move mode of the travel mechanism of electromagnetic eddy flow device can manually, electrically or hydraulic way, can be passed through
The movement of movable pulley mechanism, also can be by same so as to which electromagnetic eddy flow device is moved quickly into forward into the operating position around the mouth of a river
Mode electromagnetic eddy flow device is moved quickly into safe standby position backward, can now carry out common continuous casting；Mobile device
Chassis can also be in itself it is wheeled either rail mounted, for operative employee, chassis be located at crystallizer side when,
It can move left and right, when chassis is located at crystallizer rear or front, move forward and backward, mobile device is located at movement during crystallizer side
Mode is manually to move left and right the chassis positioned at crystallizer side, and the swirl-flow devices being fixed on chassis are quick
It is moved to around the mouth of a river or withdraws, move mode can also be the slip turbine on the cantilever either cantilever on mobile trolley used
Structure is to move swirl-flow devices；When mobile device is located at crystallizer rear or front, mobile trolley used or cantilever or slip can be made
Wheel mechanism is moved forward and backward；
（3）When carrying out continuous casting, electromagnetic eddy flow device is moved to around the mouth of a river by mobile device, the molten steel in the mouth of a river is applied
Rotary electromagnetic field, makes the molten steel in the mouth of a river produce rotation, obtains the uniform mouth of a river and goes out stream；Wherein electromagnetic eddy flow device is moved to water
During mouth surrounding, first the locking device of electromagnetic eddy flow device is opened, it is after being moved to around the mouth of a river, locking device is closed and locked,
Electromagnetic eddy flow device is looped around outside the mouth of a river, in order to make electromagnetic eddy flow device ring around inner space magnetic field it is more uniform,
Magnetic induction intensity is bigger.
2. electromagnetic eddy flow continuous cast method according to claim 1, it is characterised in that when mobile device is to be fixed on tundish
During movable pulley mechanism on chassis cantilever, electromagnetic eddy flow device is located at the opposite or side of artificial operative position at crystallizer.
3. electromagnetic eddy flow continuous cast method according to claim 1, it is characterised in that when described electromagnetic eddy flow device works
The magnetic induction intensity of the rotary electromagnetic field of generation is 10-4~ 1T, the frequency of rotary electromagnetic field is in 0.1 ~ 500Hz.
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| CN201410254236.8A CN104028717B (en) | 2014-06-10 | 2014-06-10 | A kind of electromagnetic eddy flow continuous cast method |
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| CN201410254236.8A CN104028717B (en) | 2014-06-10 | 2014-06-10 | A kind of electromagnetic eddy flow continuous cast method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015188573A1 (en) * | 2014-06-10 | 2015-12-17 | 东北大学 | Continuous casting method and device with electromagnetic swirling nozzle |
| CN105108092B (en) * | 2015-09-02 | 2017-03-08 | 青岛理工大学 | Method for researching movement law of nonmetallic inclusion by stirring magnetic field in continuous casting crystallizer |
| CN106541089A (en) * | 2015-09-17 | 2017-03-29 | 鞍钢股份有限公司 | Method for reducing slag discharging amount of tundish |
| CN106166609B (en) * | 2016-08-30 | 2018-06-29 | 湖南中科电气股份有限公司 | A kind of submersed nozzle electromagnetic eddy flow device |
| CN114029463A (en) * | 2021-11-25 | 2022-02-11 | 山东钢铁股份有限公司 | Method for solving segregation of large round billet of special steel |
| CN114131007A (en) * | 2021-12-15 | 2022-03-04 | 东北大学 | Permanent magnet rotational flow continuous casting method |
| CN115709279A (en) * | 2022-10-28 | 2023-02-24 | 东北大学 | Electromagnetic rotation water gap system based on big data and artificial intelligence |
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| JPH07108355A (en) * | 1993-10-08 | 1995-04-25 | Kobe Steel Ltd | Electromagnetic stirrer |
| JP3468978B2 (en) * | 1996-04-10 | 2003-11-25 | 新日本製鐵株式会社 | Continuous casting method of molten metal |
| CN2873367Y (en) * | 2005-09-29 | 2007-02-28 | 赫冀成 | Electromagnetic rotational flow water tap |
| CN100357049C (en) * | 2005-09-29 | 2007-12-26 | 赫冀成 | Electromagnetic eddy flow downspout |
| ATE504374T1 (en) * | 2008-05-30 | 2011-04-15 | Abb Ab | CONTINUOUS CASTING MACHINE |
| CN203079579U (en) * | 2012-11-16 | 2013-07-24 | 河南省耕生耐火材料有限公司 | Steel ladle hydraulic rod suspending device |
| CN203155970U (en) * | 2013-03-05 | 2013-08-28 | 上海大学 | Opening type magnetic stirrer for nozzle swirl |
| CN203329226U (en) * | 2013-06-20 | 2013-12-11 | 宝钢发展有限公司 | Movable safety belt fixing device |
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