CN205852118U - Oxygen Lance Nozzle for Converter replacing special purpose device - Google Patents
Oxygen Lance Nozzle for Converter replacing special purpose device Download PDFInfo
- Publication number
- CN205852118U CN205852118U CN201620596775.4U CN201620596775U CN205852118U CN 205852118 U CN205852118 U CN 205852118U CN 201620596775 U CN201620596775 U CN 201620596775U CN 205852118 U CN205852118 U CN 205852118U
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- CN
- China
- Prior art keywords
- special purpose
- purpose device
- oxygen lance
- lowering
- hoisting gear
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- 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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Abstract
This utility model provides a kind of Oxygen Lance Nozzle for Converter replacing special purpose device, including: dolly chassis, lowering or hoisting gear, horizontal, longitudinal centering mechanism and clamping structure；Described dolly chassis bottom surface is provided with wheel, and described dolly chassis end face is provided with described lowering or hoisting gear, and described horizontal stroke, longitudinal centering mechanism bottom surface are connected with described lowering or hoisting gear；Described clamping structure includes that the rounded supporting construction in cross section and ring are located at multiple shower nozzle clamp assemblies of described supporting construction surrounding, described supporting construction end face is provided with spherical crown shape depressed area, described shower nozzle clamp assembly includes mounting seat and clamping block, described mounting seat is fixedly mounted on described horizontal stroke, longitudinal centering mechanism end face, and described clamping block is slidably connected with described mounting seat；This special purpose device can improve the replacing efficiency of Oxygen Lance Nozzle for Converter, and labor cost is low, operational security is high.
Description
Technical field
This utility model relates to a kind of instrument keeping in repair Oxygen Lance Nozzle for Converter, particularly relates to a kind of Oxygen Lance Nozzle for Converter more
Change method special purpose device.
Background technology
Oxygen Lance Nozzle for Converter working environment is the most severe.High-temperature steel slag wash away with under rapid heat cycle effect, shower nozzle by
Gradually melting loss is thinning, after utilization after a while, need to be changed with being timed by shower nozzle.
Oxygen gun sprayer weighs about 120 kg.When changing, need first to be cut down, so by old shower nozzle employing oxy-acetylene
Afterwards oxygen gun sprayer commissure is carried out groove process；Pending complete after, newer oxygen gun sprayer relies on manpower be moved to install
Position, then uses the new oxygen gun sprayer of jack stand and carries out reinstalling welding.Oxygen rifle is to the installation of shower nozzle and welding
Precision is higher, but owing to circular shape and the heavier component of shower nozzle head cause the biggest impact, institute to installation accuracy
To need the check and correction correction carried out repeatedly in installation process, multiple workmans are taken the plenty of time and could be positioned by shower nozzle and install
Weld.Installing in position fixing process, owing to beaing and prizing shower nozzle repeatedly need to be carried out, it is easy to cause shower nozzle to drop, therefore
There is the biggest operation danger hidden danger.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of Oxygen Lance Nozzle for Converter more
Using special purpose device instead, this special purpose device can improve the replacing efficiency of Oxygen Lance Nozzle for Converter, and labor cost is low, job safety
Property high.
For achieving the above object, the following technical scheme of this utility model offer:
A kind of Oxygen Lance Nozzle for Converter replacing special purpose device, at least includes: dolly chassis, lowering or hoisting gear, horizontal, longitudinal centering
Mechanism and clamping structure；Described dolly chassis bottom surface is provided with wheel, and described dolly chassis end face is provided with described lowering or hoisting gear, described
Horizontal, longitudinal centering mechanism bottom surface is connected with described lowering or hoisting gear；Described clamping structure include the rounded supporting construction in cross section and
Ring is located at multiple shower nozzle clamp assemblies of described supporting construction surrounding, and described supporting construction end face is provided with spherical crown shape depressed area, institute
Stating shower nozzle clamp assembly and include mounting seat and clamping block, described mounting seat is fixedly mounted on described horizontal stroke, longitudinal centering mechanism end face,
Described clamping block is slidably connected with described mounting seat.
Further, described mounting seat is connected by several bolts with described horizontal stroke, longitudinal centering mechanism end face, described installation
Seat offers a U-lag, and the notch of described U-lag is inserted with a locking screw in described supporting construction, described mounting seat
Bolt, and described clamping screw centrage and described U-lag centerline parallel；Described clamping block is trapezoidal, and trapezoidal clamping block is movable
It is plugged in described U-lag, and an oblique waist of described trapezoidal clamping block is connected with described clamping screw afterbody.
Further, described horizontal stroke, longitudinal centering mechanism include horizontal centering supporting plate, be connected with horizontal centering supporting plate described in
Lateral adjustments screw mandrel, longitudinal centering supporting plate and the longitudinal direction regulation screw mandrel being connected with longitudinal centering supporting plate, described horizontal centering supporting plate
It is located at described longitudinal centering supporting plate bottom surface, and laterally centering supporting plate bottom surface is connected with described lowering or hoisting gear.
Further, described lateral adjustments screw mandrel and longitudinally regulation screw mandrel outer end are separately installed with handwheel.
Further, described dolly chassis end face is provided with several fairlead, described horizontal stroke, longitudinal centering mechanism bottom surface be provided with
Described guiding guide post one to one, and part described guide post activity is located in described fairlead.
Further, be provided with can several studdles of up-down adjustment for described dolly chassis.
Further, described lowering or hoisting gear includes jack, jack pedal-operated oil pump, foot pedal apparatus, described jack top
Portion is connected with described horizontal stroke, longitudinal centering mechanism bottom surface, described jack pedal-operated oil pump, foot pedal apparatus respectively with described jack
Pedal-operated oil pump is connected.
As it has been described above, Oxygen Lance Nozzle for Converter replacing special purpose device of the present utility model, have the advantages that
Oxygen gun sprayer is placed on supporting construction end face, and oxygen gun sprayer is recessed by the spherical crown shape of described supporting construction end face
Fall into district and clamping block can preferably be positioned；Only need a people just this Oxygen Lance Nozzle for Converter replacing special purpose device can be pushed away
To oxygen rifle, it is not necessary to personnel beat and prize shower nozzle, can be made by described lowering or hoisting gear and horizontal stroke, longitudinal centering mechanism
Oxygen gun sprayer near oxygen rifle inner sleeve, and oxygen gun sprayer completes to be accurately aimed at oxygen rifle inner sleeve within a short period of time, therefore replacing
Efficiency is high, labor cost is low, and operational security is high.
Accompanying drawing explanation
Fig. 1 is shown as Oxygen Lance Nozzle for Converter replacing special purpose device front view of the present utility model.
Fig. 2 is shown as Oxygen Lance Nozzle for Converter replacing special purpose device side view of the present utility model.
Fig. 3 is shown as shower nozzle clamp assembly axonometric chart of the present utility model.
Element numbers explanation
1 dolly chassis
11 wheels
12 studdles
2 lowering or hoisting gears
21 jack
22 jack pedal-operated oil pumps
23 foot pedal apparatus
31 horizontal centering supporting plates
32 lateral adjustments screw mandrels
33 longitudinal centering supporting plates
34 longitudinally regulate screw mandrel
35 handwheels
4 clamping structures
41 supporting constructions
42 shower nozzle clamp assemblies
421 mounting seats
422 clamping blocks
423 clamping screws
51 fairleads
52 guide posts
Detailed description of the invention
By particular specific embodiment, embodiment of the present utility model being described below, those skilled in the art can be by this
Content disclosed by description understands other advantages of the present utility model and effect easily.
It should be clear that structure depicted in this specification institute accompanying drawings, ratio, size etc., the most only in order to coordinate description to be taken off
The content shown, understands for those skilled in the art and reads, being not limited to this utility model enforceable restriction bar
Part, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, do not affecting
Under effect that this utility model can be generated by and the purpose that can reach, all should still fall in the technology disclosed in this utility model
In the range of Rong Suoneng is contained.Meanwhile, in this specification cited as " on ", D score, "left", "right", " middle " and " one "
Deng term, be merely convenient to narration understand, and be not used to limit the enforceable scope of this utility model, its relativeness
It is altered or modified, is changing under technology contents without essence, when being also considered as the enforceable category of this utility model.
As shown in figures 1 and 3, this utility model provides a kind of Oxygen Lance Nozzle for Converter replacing special purpose device, at least includes:
Dolly chassis 1, lowering or hoisting gear 2, horizontal, longitudinal centering mechanism and clamping structure 4；Described dolly chassis 1 bottom surface is provided with wheel 11；Excellent
Selection of land, described wheel 11 is universal wheel；Described dolly chassis 1 end face is provided with described lowering or hoisting gear 2, described horizontal stroke, longitudinal centering machine
Structure bottom surface is connected with described lowering or hoisting gear 2；It is described that described clamping structure 4 includes that the rounded supporting construction 41 in cross section and ring are located at
Multiple shower nozzle clamp assemblies 42 of supporting construction 41 surrounding, described supporting construction 41 end face is provided with spherical crown shape depressed area, described spray
Head clamping assembly 42 includes mounting seat 421 and clamping block 422, and described mounting seat 421 is fixedly mounted on described horizontal stroke, longitudinal centering machine
Structure end face, described clamping block 422 is slidably connected with described mounting seat 421.
With reference to Fig. 1 and Fig. 3, described mounting seat 421 is connected by several bolts with described horizontal stroke, longitudinal centering mechanism end face,
Described mounting seat 421 offers a U-lag, and the notch of described U-lag is near described supporting construction 41, described mounting seat 421
On be inserted with a clamping screw 423, and described clamping screw 423 centrage and described U-lag centerline parallel；Described clamping block
422 is trapezoidal, and the activity of trapezoidal clamping block 422 is plugged in described U-lag, and oblique waist and an institute of described trapezoidal clamping block 422
Stating clamping screw 423 afterbody to be connected, the most several described trapezoidal clamping blocks 422 just enclose a diameter and are from top to bottom gradually reduced
The rounded clamping space in cross section；Can by rotating described clamping screw 423, it is possible to make corresponding described trapezoidal clamping block
422 move to described clamping space center, or move to away from described clamping space center position, and then change described clamping
Space, is beneficial to position oxygen gun sprayer.Preferably, the bottom land of described U-lag is alongst provided with slide rail, described trapezoidal clamping
The elongated base plate bottom surface of block 422 is provided with chute, and described chute is slidably matched with described slide rail..
Described horizontal stroke, longitudinal centering mechanism include horizontal centering supporting plate 31, be connected with horizontal centering supporting plate 31 described laterally
Regulation screw mandrel 32, longitudinal centering supporting plate 33 and the longitudinal direction regulation screw mandrel 34 being connected with longitudinal centering supporting plate 33, described horizontal centering
Supporting plate 31 is located at described longitudinal centering supporting plate 33 bottom surface, and laterally centering supporting plate 31 bottom surface is connected with described lowering or hoisting gear 2.Preferably
Ground, rotates described lateral adjustments screw mandrel 32 for convenience and longitudinally regulates screw mandrel 34, described lateral adjustments screw mandrel 32 He
Longitudinally regulation screw mandrel 34 outer end is separately installed with handwheel 35.The handwheel 35 being connected with described lateral adjustments screw mandrel 32 by rotation,
Enable to described horizontal centering supporting plate 31 and carry out transverse shifting；By rotating the handwheel being connected with described longitudinally regulation screw mandrel 34
35, it is possible to described longitudinal centering supporting plate 33 is vertically moved, sees Fig. 1 and Fig. 2.
With reference to Fig. 1, in order to prevent dislocation, it is provided with several fairlead 51, described horizontal stroke, longitudinal direction at described dolly chassis 1 end face
Centering body bottom surface is provided with and described guiding guide post 52 one to one, and part described guide post 52 activity is located in described
In fairlead 51.During described lowering or hoisting gear 2 drives described horizontal stroke, longitudinal centering mechanism to move up or down, by institute
State guide post 52 to coordinate with described fairlead 51, it is possible to avoid described horizontal stroke, longitudinal centering mechanism to misplace with dolly chassis 1,
And then ensure that described horizontal stroke, longitudinal centering mechanism will not change with the relative position of described dolly chassis 1.
With reference to Fig. 1, described lowering or hoisting gear 2 includes jack 21, jack pedal-operated oil pump 22, foot pedal apparatus 23, described thousand
21 tops, jin top are connected with described horizontal stroke, longitudinal centering mechanism bottom surface, and described jack pedal-operated oil pump 22, foot pedal apparatus 23 are distinguished
It is connected with described jack pedal-operated oil pump 22.Described jack 21, jack pedal-operated oil pump 22, foot pedal apparatus 23 respectively with
Described dolly chassis 1 end face is connected；Operating personnel can control jack 21 by foot pedal apparatus 23.
With reference to Fig. 2, it is preferable that described dolly chassis 1 is provided with can several studdles 12 of up-down adjustment.Preferably, several
Individual studdle 12 is arranged at described dolly chassis 1 side.When described dolly chassis 1 is pushed to setting position, rotate this
Several described studdles 12 so that described studdle 12 is against ground, and ensures that wheel 11 is not stressed, and so can prevent
There is the problem of displacement in dolly chassis 1 the most in the course of the work, thus is beneficial to be rapidly completed replacing oxygen gun sprayer.
During replacing, oxygen gun sprayer being placed on supporting construction 41 end face, oxygen gun sprayer is pushed up by described supporting construction 41
The spherical crown shape depressed area in face and clamping block 422 can preferably be positioned；Only one people of need just can be this Oxygen Lance Nozzle for Converter
Replacing special purpose device is pushed into below oxygen rifle, it is not necessary to personnel beat and prize shower nozzle, by described lowering or hoisting gear 2 and horizontal,
Longitudinal centering mechanism enables to oxygen gun sprayer near oxygen rifle inner sleeve, and oxygen gun sprayer is complete within a short period of time with oxygen rifle inner sleeve
One-tenth is accurately aimed at, therefore replacing efficiency is high, labor cost is low, and operational security is high.
With reference to Fig. 1 and Fig. 2, this utility model also provides for the replacing options of a kind of Oxygen Lance Nozzle for Converter, comprises the steps:
1) attachment rail, and fractional orbital is positioned at the underface of oxygen rifle lifting point；
2) special purpose device of the Oxygen Lance Nozzle for Converter replacing described in claim 1 is placed on the track, and ensure
Wheel 11 coordinates with track；
3) utilize hoisting apparatus that oxygen gun sprayer winches to supporting construction 41 end face, and regulation clamping block 422 so that all folders
Tight block 422 is against on described oxygen gun sprayer sidewall；
4) use horizon rule that the place to be welded of oxygen gun sprayer is carried out rectification；
5), after treating rectification, manually Oxygen Lance Nozzle for Converter replacing special purpose device is pushed into oxygen along described track
Immediately below rifle；
6) described dolly chassis 1 is positioned；Specifically, rotate all studdles 12 being located on dolly chassis 1,
Make described studdle 12 be against ground, and ensure that wheel 11 is not stressed；
7) opening lowering or hoisting gear 2, described lowering or hoisting gear 2 drives horizontal stroke, longitudinal centering mechanism and supporting construction 41 to move up,
The most described oxygen gun sprayer moves up along with described supporting construction 41；When described oxygen gun sprayer is near oxygen rifle inner sleeve, described
Lowering or hoisting gear 2 stops the action driving horizontal, longitudinal centering mechanism and supporting construction 41 to move up；Preferably, described oxygen rifle is treated
When shower nozzle and oxygen rifle inner sleeve spacing are 3mm, described lowering or hoisting gear 2 stop driving horizontal, longitudinal centering mechanism and supporting construction 41 to
The action of upper movement；
8) described horizontal stroke, longitudinal centering mechanism and clamping structure 4 are adjusted so that described oxygen gun sprayer is directed in described oxygen rifle
Set；Described oxygen gun sprayer and oxygen rifle inner sleeve mismatch rate are less than in oxygen rifle the 10% of sleeve wall thickness；
9) welding machine is opened, by spot-welded together with described oxygen rifle inner sleeve for oxygen gun sprayer；
10) regulation clamping block 422 so that all clamping blocks 422 depart from described oxygen gun sprayer sidewall；
11) open lowering or hoisting gear 2 so that lowering or hoisting gear 2 returns to initial position, simultaneously described in horizontal stroke, longitudinal centering mechanism
Under described lowering or hoisting gear 2 acts on, initial position is also returned to supporting construction 41；
12) it is again turned on welding machine, completes welding of oxygen gun sprayer and described oxygen rifle inner sleeve.
Use above-mentioned replacing options can be rapidly completed replacing oxygen gun sprayer, and it is high to change quality.
Above-described embodiment only illustrative principle of the present utility model and effect thereof are new not for limiting this practicality
Type.Above-described embodiment all can be carried out by any person skilled in the art under spirit and the scope of the present utility model
Modify or change.Therefore, art has usually intellectual such as without departing from the essence disclosed in this utility model
All equivalences completed under god and technological thought are modified or change, and must be contained by claim of the present utility model.
Claims (7)
1. an Oxygen Lance Nozzle for Converter replacing special purpose device, it is characterised in that at least include: dolly chassis (1), lowering or hoisting gear
(2), horizontal, longitudinal centering mechanism and clamping structure (4)；
Described dolly chassis (1) bottom surface is provided with wheel (11), and described dolly chassis (1) end face is provided with described lowering or hoisting gear (2), institute
State horizontal stroke, longitudinal centering mechanism bottom surface is connected with described lowering or hoisting gear (2)；Described clamping structure (4) includes rounded the propping up in cross section
Support structure (41) and ring are located at multiple shower nozzle clamp assemblies (42) of described supporting construction (41) surrounding, described supporting construction (41)
End face is provided with spherical crown shape depressed area, and described shower nozzle clamp assembly (42) includes mounting seat (421) and clamping block (422), described peace
Dress seat (421) is fixedly mounted on described horizontal stroke, longitudinal centering mechanism end face, and described clamping block (422) and described mounting seat (421) can
Slide and be connected.
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 1, it is characterised in that: described mounting seat
(421) being connected by several bolts with described horizontal stroke, longitudinal centering mechanism end face, described mounting seat (421) offers a U-lag,
And the notch of described U-lag is inserted with a clamping screw (423) on described supporting construction (41), described mounting seat (421),
And described clamping screw (423) centrage and described U-lag centerline parallel；Described clamping block (422) is trapezoidal, trapezoidal clamping
Block activity is plugged in described U-lag, and an oblique waist of described trapezoidal clamping block is connected with described clamping screw (423) afterbody.
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 1, it is characterised in that: described horizontal, the most right
Middle mechanism includes horizontal centering supporting plate (31), the described lateral adjustments screw mandrel (32) being connected with horizontal centering supporting plate (31), longitudinally
Centering supporting plate (33) and longitudinal direction regulation screw mandrel (34) being connected with longitudinal centering supporting plate (33), described horizontal centering supporting plate (31) sets
In described longitudinal centering supporting plate (33) bottom surface, and laterally centering supporting plate (31) bottom surface is connected with described lowering or hoisting gear (2).
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 3, it is characterised in that: described lateral adjustments
Screw mandrel (32) and longitudinally regulation screw mandrel (34) outer end are separately installed with handwheel (35).
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 1 and 2, it is characterised in that: described little underbody
Dish (1) end face is provided with several fairlead (51), and described horizontal stroke, longitudinal centering mechanism bottom surface are provided with leads one to one with described guiding
To bar (52), and part described guide post (52) activity is located in described fairlead (51).
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 5, it is characterised in that: described dolly chassis
(1) being provided with can several studdle (12) of up-down adjustment.
Oxygen Lance Nozzle for Converter replacing special purpose device the most according to claim 1, it is characterised in that: described lowering or hoisting gear
(2) jack (21), jack pedal-operated oil pump (22), foot pedal apparatus (23) are included, described jack (21) top and described horizontal stroke,
Longitudinal centering mechanism bottom surface is connected, described jack pedal-operated oil pump (22), foot pedal apparatus (23) respectively with described jack foot
Step on oil pump (22) to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620596775.4U CN205852118U (en) | 2016-06-17 | 2016-06-17 | Oxygen Lance Nozzle for Converter replacing special purpose device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620596775.4U CN205852118U (en) | 2016-06-17 | 2016-06-17 | Oxygen Lance Nozzle for Converter replacing special purpose device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205852118U true CN205852118U (en) | 2017-01-04 |
Family
ID=57636969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620596775.4U Active CN205852118U (en) | 2016-06-17 | 2016-06-17 | Oxygen Lance Nozzle for Converter replacing special purpose device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205852118U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755721A (en) * | 2017-01-09 | 2017-05-31 | 中冶南方工程技术有限公司 | A kind of vertical pipette tips of repairing of oxygen rifle change device and method |
| CN107139022A (en) * | 2017-05-19 | 2017-09-08 | 安徽铸星机械制造有限公司 | A kind of flexible combination lathe |
| CN107511623A (en) * | 2016-06-17 | 2017-12-26 | 中冶宝钢技术服务有限公司 | Oxygen Lance Nozzle for Converter replacing options and its special purpose device |
| CN108381076A (en) * | 2018-04-19 | 2018-08-10 | 江阴精力汽车装备有限公司 | Auto parts welding equipment |
| CN109866138A (en) * | 2019-04-15 | 2019-06-11 | 常州纺织服装职业技术学院 | A kind of normally closed fixture for the assembly of molten steel sampler sand mold |
| CN112404643A (en) * | 2020-11-05 | 2021-02-26 | 山东钢铁集团日照有限公司 | RG-YQ fast and stable vertical alignment oxygen lance welding device |
| CN113355485A (en) * | 2021-05-24 | 2021-09-07 | 鞍钢集团大连科技创意有限公司 | Spray gun replacing device for molten iron desulphurization and use method thereof |
| CN115198052A (en) * | 2022-06-28 | 2022-10-18 | 攀钢集团工程技术有限公司 | Top-mounted device of converter oxygen lance nozzle |
-
2016
- 2016-06-17 CN CN201620596775.4U patent/CN205852118U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107511623A (en) * | 2016-06-17 | 2017-12-26 | 中冶宝钢技术服务有限公司 | Oxygen Lance Nozzle for Converter replacing options and its special purpose device |
| CN106755721A (en) * | 2017-01-09 | 2017-05-31 | 中冶南方工程技术有限公司 | A kind of vertical pipette tips of repairing of oxygen rifle change device and method |
| CN107139022A (en) * | 2017-05-19 | 2017-09-08 | 安徽铸星机械制造有限公司 | A kind of flexible combination lathe |
| CN108381076A (en) * | 2018-04-19 | 2018-08-10 | 江阴精力汽车装备有限公司 | Auto parts welding equipment |
| CN108381076B (en) * | 2018-04-19 | 2023-09-19 | 江阴精力汽车装备有限公司 | Automobile part welding equipment |
| CN109866138A (en) * | 2019-04-15 | 2019-06-11 | 常州纺织服装职业技术学院 | A kind of normally closed fixture for the assembly of molten steel sampler sand mold |
| CN112404643A (en) * | 2020-11-05 | 2021-02-26 | 山东钢铁集团日照有限公司 | RG-YQ fast and stable vertical alignment oxygen lance welding device |
| CN113355485A (en) * | 2021-05-24 | 2021-09-07 | 鞍钢集团大连科技创意有限公司 | Spray gun replacing device for molten iron desulphurization and use method thereof |
| CN115198052A (en) * | 2022-06-28 | 2022-10-18 | 攀钢集团工程技术有限公司 | Top-mounted device of converter oxygen lance nozzle |
| CN115198052B (en) * | 2022-06-28 | 2023-10-20 | 攀钢集团工程技术有限公司 | Top-loading device for oxygen lance nozzle of converter |
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