CN102401563B - Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function - Google Patents
Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function Download PDFInfo
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- CN102401563B CN102401563B CN201110390141.5A CN201110390141A CN102401563B CN 102401563 B CN102401563 B CN 102401563B CN 201110390141 A CN201110390141 A CN 201110390141A CN 102401563 B CN102401563 B CN 102401563B
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Abstract
The invention relates to a water-cooling furnace cover of a ladle refining (LF) furnace with high-temperature camera shooting function; a sliding flue is connected onto a side smoke exhaust hood by a pin shaft, and is connected with a water-cooling pipeline of the side smoke exhaust hood by a metal hose; the side smoke exhaust hood is connected with a furnace cover body by a flange, and is connected with the water-cooling pipeline by another metal hose; the upper part of a center piece is surrounded with three electrode holes, and electrode holders can be arranged in the electrode holes; the center piece is arranged on the side smoke exhaust hood and is used for preventing the outside air from entering into the side smoke exhaust hood; the center piece is connected with the side smoke exhaust hood by another flange and another pin shaft, and is connected with the water-cooling pipeline by another metal hose; three pieces of H-beam steel are welded with the furnace cover body into a whole, so that three furnace cover suspension points can be formed and are used for supporting a water distributor; the furnace cover body is provided with a high-temperature camera shooting device for monitoring the condition in the furnace in real time; and the water-cooling furnace cover has a full water-cooling structural form. The invention confirms a structural form of an energy-saving and environment-friendly water-cooling furnace cover of the LF furnace with the high-temperature camera shooting function, and the water-cooling furnace cover is provided with the high-temperature camera shooting device, so that the condition in the furnace can be monitored in real time.
Description
Technical field
The present invention relates to the LF ladle refining furnace, particularly a kind of energy saving and environment friendly water cooled cover of the ladle refining furnace with high-temperature camera shooting function.
Background technology
The water cooled cover of LF ladle refining furnace, for maintaining the reducing atmosphere of processing procedure, is collected the flue dust produced in LF stove smelting process.The design of current domestic LF stove water cooled cover, be the drawing of indiscriminately imitating original similar item mostly, therefore, although the function of bell can meet need of production, can not meet the requirement of energy-conserving and environment-protective, is mainly manifested in following three aspects:
1, bell dedusting exhausting loop design is unreasonable, and while causing suction air volume too small, flue gas escapes seriously, severe operational environment; When suction air volume is excessive, in stove, the heat treatment atmosphere is taken away in a large number, causes energy waste, causes that programming rate descends.
2, the design of bell water cooling labyrinth is unreasonable, if cooling water flow is too small, causes the bell cooling effect poor, and inhomogeneous cooling is even, thereby affects the service life of water cooled cover; If cooling water flow is excessive, make the thermal loss caused by cooling water excessive.
3, existing LF stove does not possess camera function in stove, lacks the monitoring to smelting process.
Water cooled cover is the nucleus equipment of LF ladle refining furnace, is also the key point that the normal operation of whole ladle furnace and clean steel are produced.The energy-conserving and environment-protective performance of water cooled cover is also the important prerequisite condition that guarantees the operation of ladle refining furnace low-carbon (LC).
In view of this, seek a kind of Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function and become pursuing a goal of these those skilled in the art.
Summary of the invention
Task of the present invention is to provide a kind of Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function, it has solved the existing problem of prior art, from energy balance and heat transfer principle angle, exhaust gas volumn and the cooling water inflow of LF stove water cooled cover carried out to analysis and calculation, and utilize high-precision detection means to carry out the control of pressure-fired regulation technology, determined a kind of structural shape of the energy saving and environment friendly LF stove water cooled cover with high-temperature camera shooting function.
Technical solution of the present invention is as follows:
A kind of Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function, it comprises the bell body, and it also comprises slip flue, side smoking cover, door, actuating doors, central part, bell pipe arrangement, bottom petticoat pipe, telescopic tube, the reinforced sleeve pipe in water-cooled bottom and electrode tip holder for rifle;
Described slip flue is formed by steel-pipe welding, is connected on the side smoking cover by bearing pin, and connects with side smoking cover water-cooled pipeline by metal hose;
Described side smoking cover is formed by steel-pipe welding, is connected by flange with the bell body, and connects with the water-cooled pipeline by metal hose;
Described central part is formed by steel-pipe welding, but central part top is with three electrode holes of electrodes seat, central part is placed on the side smoking cover and enters to completely cut off extraneous air, and central part passes through flange, bearing pin and is connected with the side smoking cover, and connects with the water-cooled pipeline by metal hose;
Described rifle is formed by steel-pipe welding with door, passes through air cylinder driven;
Described actuating doors is formed by Plate Welding, is water wall structure, and actuating doors is in tilted layout;
Described bell body is formed by steel-pipe welding, and three H shaped steel and bell body are welded, form three bell suspension centres and support water dispenser; The welding of bell body bottom and bottom petticoat pipe, it is suitable for reading that shirt rim, bell body bottom is enclosed in ladle, and have a spacing apart from ladle is suitable for reading, to allow the ladle slag slightly that covers suitable for reading; The reinforced sleeve pipe in the water-cooled bottom of described bell body is made into inverted cone-shaped structure, the inner flue gas of the stove produced while smelting to collect in ladle;
High-temperature camera is housed to monitor in real time situation in stove on described bell body;
Described bottom petticoat pipe is formed by Plate Welding, and the petticoat pipe pipeline divides two-layer up and down, mutually isolated;
The reinforced sleeve pipe in described water-cooled bottom is formed by steel plate and steel-pipe welding, is water wall structure, vertically is positioned on the bell body;
Described telescopic tube is with together with water-cooled bottom charge pipe is bolted on;
Described water cooled cover is the full water cooling structural shape.
Described electrode tip holder is comprised of upper and lower two parts, and the upper electrode seat amounts to three, on the centering part; The lower electrode seat is an integral form, is placed on the bell body with for bell and interelectrode insulation and isolated flue gas.
On described side smoking cover, the hydraulic flap valve is set, realizes the control of bell pressure-fired with the air quantity of regulating main air draft pipeline.
Described side smoking cover is connected with cleaning shaft in workshop, electric control valve is housed to carry out the pressure-fired adjusting on cleaning shaft.
Described bell body is provided with perforate at actuating doors, rifle with door and near feeding place, silk hole, to aspirate the excessive flue gas of described perforate.
Described bell body is provided with several furnace pressure test points.
Described petticoat pipe pipeline is provided with eight circumferential shoot doors, and shoot door is stuck on the petticoat pipe of bottom by round steel, and by sealing strip and the sealing of bottom petticoat pipe.
Be equipped with safety valve on the water inlet of described water cooled cover and return main.
The cooling water Inlet and outlet water house steward of described water cooled cover is provided with flow instrumentation, and outfall sewer is provided with temperature instrument.
Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function of the present invention has following technical characterstic:
1, from energy balance and heat transfer principle angle, exhaust gas volumn and the cooling water inflow of LF stove water cooled cover carried out to analysis and calculation, for definite technological parameter provides theoretical foundation.
2, adopt high-precision differential pressure transmitter to carry out the furnace pressure detection, can maintain furnace pressure in+5 arrive+50Pa scopes.
3, the hydraulic flap valve and the electric control valve associating air quantity regulation technology that adopt hydraulic proportion valve to control, realize the real-time adjusting of dedusting air quantity.
4, adopt the double-deck coil structures of anti-the material, be conducive to maintain reducing atmosphere, avoid furnace high-temperature atmosphere to run off, reduce all kinds of consumption.
5, high-temperature camera has been installed on water cooled cover, can have been monitored situation in stove in real time.
The accompanying drawing explanation
Fig. 1 is the front view of a kind of Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function of the present invention.
Fig. 2 is by the right view shown in Fig. 1.
Fig. 3 is the angular field of view figure of the high temperature resistant camera machine of Fig. 1 water cooled cover.
Fig. 4 is the position view of the hydraulic flap valve of Fig. 1 water cooled cover.
Reference numeral:
1 is actuating doors, and 2 for advancing, the backwater distributor, 3 is the electrode tip holder central part, 4 is the side smoking cover, and 5 is electrode tip holder, and 6 is the bell body, 7 is the bottom petticoat pipe, 8 is high-temperature camera, and 9 is the hydraulic flap valve, and 10 is the slip flue, 11 is door for rifle, 12 is telescopic tube, and 13 is the charge pipe sealing gland, and 14 is the reinforced sleeve pipe in water-cooled bottom.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
Referring to Fig. 1 to Fig. 4, the invention provides a kind of Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function, it mainly for bell body 6, slip flue 10, side smoking cover 4, rifle door 11, actuating doors 1, central part 3, bell pipe arrangement, bottom petticoat pipe 7, telescopic tube 12, the reinforced sleeve pipe 14 in water-cooled bottom, charge pipe sealing gland 13 and electrode tip holder 5 form.
Central part 3 is formed by steel-pipe welding, but central part 3 tops are with three electrode holes of electrodes seat 5, central part 3 is placed on side smoking cover 4 and enters to completely cut off extraneous air, and central part 3 passes through flange, bearing pin and is connected with side smoking cover 4, and connects with the water-cooled pipeline by metal hose.
Rifle is formed by steel-pipe welding with door 11, passes through air cylinder driven.Actuating doors 1 is formed by Plate Welding, is water wall structure, and actuating doors 1 is in tilted layout.
Bell body 6 is formed by steel-pipe welding, and three H shaped steel and bell body 6 are welded, form three bell suspension centres and support water dispenser 2.Bell body 6 tops and 4 welding of side smoking cover, bell body 6 bottoms and 7 welding of bottom petticoat pipe, it is suitable for reading that bell body 6 shirt rims, bottom are enclosed in ladle, and suitable for reading at regular intervals apart from ladle, to allow the ladle slag slightly that covers suitable for reading.The reinforced sleeve pipe 14 in the water-cooled bottom of bell body 6 is made into inverted cone-shaped structure, the inner flue gas of the stove produced while smelting to collect in ladle.Bell body 6 is provided with perforate at actuating doors 1, rifle with door 11 and near feeding place, silk hole, with the excessive flue gas of suction perforate.
On bell body 6, installing high-temperature camera 8 is to monitor in real time situation in stove.Several furnace pressure test points also are set on bell body 6.
The reinforced sleeve pipe 14 in water-cooled bottom is formed by steel plate and steel-pipe welding, is water wall structure, vertically is positioned on bell body 6.Together with the reinforced sleeve pipe 14 in telescopic tube 12 and water-cooled bottom is bolted on.
The petticoat pipe pipeline is provided with eight circumferential shoot doors, and shoot door is stuck on the petticoat pipe 7 of bottom by round steel, and by sealing strip and 7 sealings of bottom petticoat pipe.
Safety valve all is set on the water inlet of water cooled cover and return main.The cooling water Inlet and outlet water house steward of water cooled cover is provided with flow instrumentation, and outfall sewer is provided with temperature instrument.
Water cooled cover of the present invention is the full water cooling structural shape, and whole water cooled cover forms with seamless steel pipe and bend group welding, forms the high-efficiency water cooling forced circulation of current-sharing without dead point.Structural member and the function of water cooled cover are as follows:
The slip flue is formed by the 20g steel-pipe welding, and for regulating the sectional area of side smoking cover, thereby regulating stove covers the air quantity of section's flue gas.The slip flue is connected on the side smoking cover by four bearing pins, and cooling line is to connect with side smoking cover water-cooled pipeline by metal hose.
The side smoking cover is formed by the 20g steel-pipe welding, for collecting the inboard flue gas of ladle, with the bell body, by flange, is connected, and is convenient for changing.Cooling line is to connect with the water-cooled pipeline by metal hose.The side smoking cover is connected (certain interval being arranged, in order to utilize the wild wind cooling to high-temperature flue gas) with cleaning shaft in workshop.Electric control valve is housed on cleaning shaft, makes bell there is the pressure-fired regulatory function, so not only prevent that outside atmosphere from entering ladle, keep the reducing atmosphere of ladle inside, and prevent the flue gas effusion.This layout makes air enter the possibility that ladle contacts inner molten steel to drop to minimum.Some furnace pressure test points can be set on bell, can carry out the furnace pressure detection, and carry out the furnace pressure adjusting by the position electric control valve, to guarantee the pressure-fired atmosphere in bell.
Central part is to be formed by the 20g steel-pipe welding, and top crosses three electrode holes, so that the electrodes seat.Central part is placed on the side smoking cover, in order to isolated extraneous air, enters, and guarantees dust removing effects and thermal loss preferably.Central part is connected with the side smoking cover by flange, bearing pin, for convenience detach.Cooling line is to connect with the water-cooled pipeline by metal hose.Electrode tip holder is made by corundum, upper and lower two parts, consists of, and the upper electrode seat amounts to three, on the centering part, with the form of the upper electrode seat being made to an integral body in the past, compare, greatly reduced the use amount of corundum,, and but water flowing is cooling, improve the service life of central part.The lower electrode seat is an integral form, is placed on the bell body, for bell and interelectrode insulation and isolated flue gas.Adopt the double-deck coil structures of anti-the material, be conducive to maintain reducing atmosphere, avoid furnace high-temperature atmosphere to run off, reduce all kinds of consumption.
Accident argon rifle door is formed by the 20g steel-pipe welding, by air cylinder driven, blows the operation of accident argon rifle decline Argon when obstructed for BOTTOM ARGON BLOWING.
Actuating doors is formed by the Q345R Plate Welding, water wall structure, and actuating doors is in tilted layout, with handled easily.
The bell body is whole water cooled cover basis, by the 20g steel-pipe welding, is formed, Q245R steel plate shutoff for poorly sealed Mi Chu.Three H shaped steel and bell body are welded, for the hositing mechanism of furnace roof provides three bell suspension centres and for the support of water dispenser.The bell body is for support-side smoking cover, material alloying pipe, accident argon rifle door, actuating doors, hello silk hole etc.Bell body top and the welding of side smoking cover, bell body bottom and the welding of bottom petticoat pipe, it is suitable for reading that shirt rim, bell body bottom is enclosed in ladle, and suitable for reading at regular intervals apart from ladle, can allow the ladle slag that covers certain altitude suitable for reading, and guarantee that this internal system flue gas and extraneous air can be pumped among the cleaning shaft in workshop by the bottom petticoat pipe simultaneously.The reinforced sleeve pipe in water-cooled bottom is made into inverted cone-shaped structure, the inner flue gas of the stove produced while smelting for collecting in ladle, and the structure of this back taper can prevent that the slag splashed from sticking on water cooled cover and being easy to cleaning effectively.Near actuating doors, accident argon rifle door and hello place, silk hole, the bell body is provided with perforate, for aspirating the excessive flue gas of above-mentioned three places perforate.
The bottom petticoat pipe is formed by the Q345R Plate Welding, and the petticoat pipe pipeline divides two-layer up and down, mutually isolated, is respectively used to the suction of ladle front and back two parts flue gas, prevents from only aspirating flue gas local in ladle.Eight circumferentially shoot doors are arranged on pipeline, and shoot door is stuck on the petticoat pipe of bottom by round steel, and by sealing strip and the sealing of bottom petticoat pipe, not excessive to guarantee flue gas.This bottom petticoat pipe is mainly used in collecting the flue gas in the ladle outside and can clearing up the petticoat pipe dust stratification by shoot door.
Alloy material is joined in ladle by telescopic tube, the reinforced sleeve pipe in water-cooled bottom.The reinforced sleeve pipe in water-cooled bottom is formed by Q345R steel plate and steel-pipe welding, is water wall structure, vertically is positioned on the bell body.Feeding device is fixed on the bell body by steady pin, for preventing the impact of molten steel hyperthermia radiation on charge pipe.Telescopic tube is with together with water-cooled bottom charge pipe is bolted on.
All cooling waters of need changing parts and moving component connect and all adopt connection by metal hose, with for convenience detach, change and motion.Remaining cooling water circulation is direct and distributor welding with steel pipe.Each cooling circuit all is furnished with the ball valve for regulating water flow, for preventing the damage of ball valve, is furnished with corresponding expansion joint.Each cooling circuit all is furnished with joint and the ball valve for the compression air purge.On bell water inlet and return main, safety valve all is set.
As shown in Figure 3, high-temperature camera 8 has been installed on bell body 6, can have been monitored situation in stove in real time.
Bell cooling water Inlet and outlet water house steward is provided with flow instrumentation (difference in flow is set reports to the police), and outfall sewer is provided with temperature instrument.The temperature of water cooled cover, flow are monitored, are recorded, are reported to the police by PLC.The highest return water temperature≤55 ° C.
As shown in Figure 4, a hydraulic flap valve 9 is set on side smoking cover 4, for regulating the air quantity of main air draft pipeline, thereby realizes the control of bell pressure-fired, make bell there is the pressure-fired regulatory function.Pressure tappings in three stoves is set on the bell body, gather after pressure and carry out pressure detecting, can realize that by high-precision pressure difference transmitter furnace pressure monitors in real time, and carry out the furnace pressure adjusting by regulator solution pressure plate valve and motorized adjustment valve opening, to guarantee the pressure-fired atmosphere in stove, can maintain furnace pressure within+5-+50Pa scope, so not only can prevent that outside atmosphere from entering ladle, the reducing atmosphere that keeps ladle inside prevents the flue gas effusion, meet the requirement of environmental protection simultaneously.
In sum, Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function of the present invention has following advantage: from energy balance and heat transfer principle angle, exhaust gas volumn and the cooling water inflow of LF stove water cooled cover carried out to analysis and calculation, for definite technological parameter provides theoretical foundation; Adopt high-precision differential pressure transmitter to carry out the furnace pressure detection, can maintain furnace pressure in+5 arrive+50Pa scopes; The hydraulic flap valve and the electric control valve associating air quantity regulation technology that adopt hydraulic proportion valve to control, realize the real-time adjusting of dedusting air quantity; Adopt the double-deck coil structures of anti-the material, be conducive to maintain reducing atmosphere, avoid furnace high-temperature atmosphere to run off, reduce all kinds of consumption; High-temperature camera has been installed on water cooled cover, can have been monitored situation in stove in real time.
Certainly, those skilled in the art in the art will be appreciated that, above-described embodiment is only for the present invention is described, and not as limitation of the invention, as long as in connotation scope of the present invention, to the variation of above-described embodiment, modification etc., all will drop in the scope of the claims in the present invention.
Claims (4)
1. the Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function, it comprises the bell body, it is characterized in that: it also comprises slip flue, side smoking cover, door, actuating doors, central part, bell pipe arrangement, bottom petticoat pipe, telescopic tube, the reinforced sleeve pipe in water-cooled bottom and electrode tip holder for rifle;
Described slip flue is formed by steel-pipe welding, is connected on the side smoking cover by bearing pin, and connects with side smoking cover water-cooled pipeline by metal hose;
Described side smoking cover is formed by steel-pipe welding, is connected by flange with the bell body, and connects with the water-cooled pipeline by metal hose;
Described central part is formed by steel-pipe welding, but central part top is with three electrode holes of electrodes seat, central part is placed on the side smoking cover and enters to completely cut off extraneous air, and central part is connected with the side smoking cover, and connects with the water-cooled pipeline by metal hose by flange, bearing pin;
Described rifle is formed by steel-pipe welding with door, passes through air cylinder driven;
Described actuating doors is formed by Plate Welding, is water wall structure, and actuating doors is in tilted layout;
Described bell body is formed by steel-pipe welding, and three H shaped steel and bell body are welded, form three bell suspension centres and support water dispenser; The welding of described bell body bottom and bottom petticoat pipe, it is suitable for reading that shirt rim, bell body bottom is enclosed in ladle, and have a spacing apart from ladle is suitable for reading, to allow the ladle slag slightly that covers suitable for reading; The reinforced sleeve pipe in the water-cooled bottom of described bell body is made into inverted cone-shaped structure, the inner flue gas of the stove produced while smelting to collect in ladle;
High-temperature camera is housed to monitor in real time situation in stove on described bell body;
Described bottom petticoat pipe is formed by Plate Welding, and bottom petticoat pipe pipeline divides two-layer up and down, mutually isolated;
The reinforced sleeve pipe in described water-cooled bottom is formed by steel plate and steel-pipe welding, is water wall structure, vertically is positioned on the bell body;
Described telescopic tube is with together with water-cooled bottom charge pipe is bolted on;
Described water cooled cover is the full water cooling structural shape;
Described electrode tip holder is comprised of upper and lower two parts, and the upper electrode seat amounts to three, on the centering part; The lower electrode seat is an integral form, is placed on the bell body with for bell and interelectrode insulation and isolated flue gas;
On described side smoking cover, the hydraulic flap valve is set, realizes the control of bell pressure-fired with the air quantity of regulating main air draft pipeline;
Described side smoking cover is connected with cleaning shaft in workshop, electric control valve is housed to carry out the pressure-fired adjusting on cleaning shaft;
Described bell body is provided with perforate at actuating doors, rifle with door and near feeding place, silk hole, to aspirate the excessive flue gas of described perforate;
Described bell body is provided with several furnace pressure test points.
2. the Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function according to claim 1, it is characterized in that: described bottom petticoat pipe pipeline is provided with eight circumferential shoot doors, shoot door is stuck on the petticoat pipe of bottom by round steel, and by sealing strip and the sealing of bottom petticoat pipe.
3. the Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function according to claim 1, is characterized in that: on the water inlet of described water cooled cover and return main, be equipped with safety valve.
4. the Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function according to claim 1, it is characterized in that: the cooling water Inlet and outlet water house steward of described water cooled cover is provided with flow instrumentation, and outfall sewer is provided with temperature instrument.
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| CN201110390141.5A CN102401563B (en) | 2011-12-01 | 2011-12-01 | Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function |
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| CN201110390141.5A CN102401563B (en) | 2011-12-01 | 2011-12-01 | Water-cooling furnace cover of ladle refining furnace with high-temperature camera shooting function |
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| CN102401563B true CN102401563B (en) | 2014-01-01 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103225958B (en) * | 2013-05-17 | 2014-08-27 | 中冶赛迪工程技术股份有限公司 | Water-cooling inert gas furnace cover |
| CN103512037B (en) * | 2013-09-25 | 2016-09-14 | 欧萨斯能源环境设备(南京)有限公司 | A kind of Isa furnace water-cooling screen |
| CN103925793B (en) * | 2014-04-03 | 2016-03-02 | 宝钢工程技术集团有限公司 | Water cooled cover feeds in raw material dust arrester and water cooled cover charging system |
| CN103924032B (en) * | 2014-04-03 | 2015-11-11 | 宝钢工程技术集团有限公司 | Water cooled cover cleaning door |
| CN106399624A (en) * | 2016-06-12 | 2017-02-15 | 江苏永钢集团有限公司 | Ladle refining furnace water-cooling furnace cover |
| CN106247801B (en) * | 2016-09-29 | 2019-04-12 | 宝钢工程技术集团有限公司 | A kind of water cooled cover of ladle refining furnace |
| CN108680004B (en) * | 2018-07-05 | 2023-12-08 | 中冶京诚工程技术有限公司 | Electric arc furnace |
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| CN2450220Y (en) * | 2000-10-19 | 2001-09-26 | 中国冶金建设集团包头钢铁设计研究总院 | Bell of ladle refining furnace |
| CN2514288Y (en) * | 2001-12-21 | 2002-10-02 | 烟台冶金水冷件厂 | Refining furnace cover for smelting steel |
| JP4292511B2 (en) * | 2004-06-21 | 2009-07-08 | トヨタ自動車株式会社 | Exhaust gas purification device |
| CN201427977Y (en) * | 2009-07-20 | 2010-03-24 | 天津市三特电子有限公司 | High-temperature monitoring device of refining furnace |
| CN201740394U (en) * | 2010-05-27 | 2011-02-09 | 上海宝钢铸造有限公司 | Water-cooled cast iron type lid of vacuum refining furnace |
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