CN205907335U

CN205907335U - Atmosphere protecting device

Info

Publication number: CN205907335U
Application number: CN201620567712.6U
Authority: CN
Inventors: 吴建军; 赵伟; 郭建
Original assignee: Chongqing Iron and Steel Group Co Ltd
Current assignee: Chongqing Iron and Steel Group Co Ltd
Priority date: 2016-06-13
Filing date: 2016-06-13
Publication date: 2017-01-25
Anticipated expiration: 2026-06-13

Abstract

The utility model discloses an atmosphere protecting device, including crystallizer, the vertical setting in the stand of crystallizer one side, the stand top is provided with horizontal cantilever, is just having downwardly extending's dummy electrode on the horizontal cantilever to crystalliser installation by electrode holder, still including the elevating gear who is used for driving the elevating movement on the stand of horizontal cantilever, still include atmosphere protecting device, atmosphere protecting device is including setting up the intake pipe in the safety cover between dummy electrode and the crystallizer upper end surface and the safety cover that can admit air, and its characterized in that, safety cover upper end fixed connection are on dummy electrode, and the safety cover makes under the dummy electrode in voguely for airtight material along folding the making of vertical flexibility, and the safety cover can produce vertical folding shrink. The utility model has the advantages of simple structure, not fragile, the atmosphere protection is stable, can improve the smelting security, improves BF metallurgcal effect.

Description

A kind of atmosphere protection device

Technical field

This utility model is related to a kind of metal smelt technology electroslag refining furnace, more particularly, to a kind of atmosphere of electroslag refining furnace Protection device.

Background technology

Metal electroslag furnace (also known as electroslag refining furnace) be by the use of electric current by slag when the resistance heat that produces be used as thermal source and enter A kind of metallurgical equipment of row melting, its structure mainly includes the overall crystallizer in oven-like, the column positioned at crystallizer side, stands It is provided with horizontal cantilever above post, horizontal cantilever is just provided with to crystallizer by electrode bar chuck and extends down into crystallizer Electrode bar.

During electroslag furnace smelting work, electroslag is put in crystallizer, and forms slag bath to be melted above crystallizer, adopts Electrode bar chuck clamping cylindricality electrode bar, and allow electrode bar, slag bath, metal bath, steel ingot, bottom water case pass through short net wire and Transformator can form current loop.When carrying out electroslag smelting, first by this electrode bar away from electroslag smelting electrode bar chuck In end insertion slag, subsequently electrode bar is energized, in galvanization, electrode bar and slag bath release Joule heat, by slag Regulus fusing in pond.Motlten metal pools liquid, through slag bath, falls into formation metal bath in crystallizer, and simultaneously Acted on by water-cooled, be quickly solidified to form steel ingot.Before ingot solidification, the metal bath above it and slag bath, play insulation and mend Contracting effect is it is ensured that the compactness of steel ingot.In smelting process, crystallizer inwall is formed with one layer of thin skull, not only makes steel ingot table Face is bright and clean, also plays insulation and heat-blocking action, makes more heats to lower conduction, is conducive to steel ingot orientation knot from bottom to top Brilliant.Based on above reason, the ingot quality produced by electroslag smelting is good, performance is excellent, the low temperature of steel alloy, room temperature and high temperature Under plasticity and impact flexibility strengthen, steel service life extends, therefore electroslag smelting technique widely uses in this industry.

But in existing electroslag smelting technique, mostly using carrying out electroslag remelting under atmospheric pressure state, under air, remelting is easy Cause the secondary oxidation of steel ingot, cause the scaling loss of active element so that the oxygen content in steel and inclusion content are higher, be difficult to life The special steel of output high-cleanness, high.Partly it is provided with atmosphere protection technology in existing electroslag smelting device, but existing electroslag smelting Training of qi atmosphere resist technology mainly divides two kinds: 1, general EAR stove is protected using direct blown inert gas, top of the slag sealing effect Difference, melting loss of elements is still more serious；2nd, in protective atmosphere electroslag furnace, crystallizer to dummy electrode is partly all overall by protective cover Sealing, makes crystallizer in reflow process, the top of the slag all the time with air exclusion and logical protective gas is protected.For example A kind of coaxial atmosphere protected electro-slag re-melting stove disclosed in zl201420422529.8.

But in this remelting furnace, dummy electrode part needs to arrange movable sealing structure, under movable sealing structure complexity and hot environment It is easily damaged, during during smelting, dummy electrode is descending, protective cover upper end can be along dummy electrode upward sliding, therefore dummy electrode need to be arranged very Length is stepped down, and is so unfavorable for that the axiality of electrode controls, and easy generation is beaten arc phenomenon and leads to crystallizer to damage；Adopt simultaneously Water-cooling pattern protects integral seal structure, and preferably but device structure is complicated for protected effect, and the remelting preparation time is long, safeguards and protects Support difficulty；When in addition implementing in existing electroslag refining furnace, its transformation process often requires that the transmission of entirely existing electroslag And control system is replaced, expensive substantially increase production cost, and equipment use in complex operation.In addition in weight Above molten bath, the water-cooling system of its device setting there is also the potential safety hazard of larger generation leakage accident.

Utility model content

For above-mentioned the deficiencies in the prior art, technical problem to be solved in the utility model is: how to provide a kind of knot Structure is simple, is hardly damaged, atmosphere protection is stable, it is possible to increase smelt safety, improves the atmosphere protection device of metallurgical effect.

In order to solve above-mentioned technical problem, this utility model employs following technical scheme:

A kind of atmosphere protection device, atmosphere protection device includes the guarantor being arranged between dummy electrode and crystallizer upper end face Guard shield and can the air inlet pipe in protective cover for the air inlet it is characterised in that protective cover upper end is fixedly connected on dummy electrode, protection Cover for gas impermeable material vertically flexible folding be obtained make dummy electrode descending when, protective cover can produce vertical folding and receive Contracting.

So, when electroslag refining furnace is smelted, protective cover upper end is fixedly installed on dummy electrode, passes through air inlet pipe before smelting Control protective gas to enter in crystallizer and carry out atmosphere protection, in smelting process, dummy electrode is descending drives protective cover upper end descending Draw close with protective cover lower end, reduce protective cover inner space volume, protective cover can be stepped up so that with the carrying out smelted The air pressure of interior protective gas, preferably forces molten metal liquid to flow down in crystallizer by this air pressure, improves and smelts Efficiency.Simultaneously protective cover upper end and dummy electrode linkage, therefore dummy electrode length need not arrange long for protective cover upper end thereon Slide, dummy electrode lower end is easy to keep from molten electrode axiality, improves smelting stability and safety.In addition, on protective cover End is fixed on that dummy electrode is motionless, and flexible folding and dummy electrode by protective cover itself are servo-actuated, such protective cover upper end and dummy electrode For secure fit, in high-temperature severe environment, structure is more stable, is more hardly damaged.Meanwhile, protective cover can on crystallizer Enough preferably avoid smelting high temperature, extend the atmosphere protection device life-span, and protective cover can be given when smelting to crystallizer inside Certain protective gas positive pressure is provided, is beneficial to the carrying out of smelting, improve smelting quality and efficiency.

As optimization, protective cover upper end is fixedly connected on dummy electrode by a upper retainer ring, and upper Fixing shrink ring is connected on Dummy electrode is outer and bottom is the discoid connecting portion extending radially outwardly along dummy electrode, connects lower surface and protective cover upper end It is tightly connected, upper retainer ring top is the fixed part extending axially upward along dummy electrode, fixed part is horizontally arranged with screw simultaneously Top screw is fixed on dummy electrode inwardly through screw, and upper retainer ring is additionally provided with bleed passage.

So, upper retainer ring facilitates the installation of protective cover upper end to fix, quick and easy for installation, fixing reliable, arranges simultaneously Bleed passage can when protective gas is passed through, by air in protective cover from bleed passage extrude, beneficial to the shape of protective atmosphere Become.

As optimization, upper retainer ring is additionally provided with disappointing governor motion, described disappointing adjustment structure includes one and loses heart Regulating bolt, disappointing regulating bolt horizontally set and screw thread coordinate on the connecting portion of upper retainer ring, disappointing regulating bolt outer end It is exposed to connecting portion outer surface and constitutes regulation handle, disappointing regulating bolt is inner rotatable and axial limiting coordinates at one On regulating block within positioned at retainer ring, regulating block the inner is located in bleed passage and regulating block can be with disappointing regulating bolt Rotation is displaced outwardly gradually to close bleed passage.

As such, it is possible to rely on regulating bolt of losing heart conveniently and efficiently to adjust the cross section size of bleed passage, let out with adjusting The size of tolerance so that maintain after protective gas air inlet when smelting positive air pressure in crystallizer size adjustable, so that this pressure Power can better adapt to smelting demand, improves metallurgical effect.Simultaneously when protective gas air inlet formation protection atmosphere in crystallizer Afterwards, can also turn down in time as needed and be even switched off bleed passage, to keep protective gas atmosphere and the protection in crystallizer Gas positive pressure, and save protective gas consumption.

As optimization, between upper retainer ring and dummy electrode, be additionally provided with sealing structure, upper sealing structure include one convex Go out to be formed at the spacing circle convex platform of dummy electrode outer surface, also include being compressed in spacing circle convex platform upper surface and upper retainer ring Upper sealing ring between lower surface.

So, convenient realization above being tightly connected between retainer ring and dummy electrode, it is to avoid lose heart from junction.

As optimization, protective cover lower end is connected to crystallizer upper end face by a discoid lower fixed ring seals, Air inlet pipe is arranged in lower retainer ring.

So, setting being fixedly connected of convenient protective cover lower end of lower retainer ring.

As optimization, the inner position of described crystallizer upper end face is provided with the limited block of the shape of falling l, in described lower retainer ring Sidepiece card pressure spacing in limited block, lower retainer ring lateral part runs through by vertically arranged connecting bolt and is connected on crystallizer End, between lower retainer ring lower surface and crystallizer upper end face, pressure is provided with lower seal and realizes sealing.

So so that lower retainer ring is quick and easy for installation, fix reliability and good sealing effect.

As optimization, also include protective gas preheating structure, protective gas preheating structure includes a protective gas preheating Chamber, described air inlet pipe connects air inlet and reconnects air inlet to protective cover to the preheating of protective gas preheating chamber.

So, protective gas preheating after enter back in crystallizer, it is to avoid protective gas temperature too low to smelting in crystallizer The impact that refining reaction causes is fluctuated and is affected smelting quality.Particularly protective gas is usually that compression is stored in storage tank, releases Release rear gas volume and become the process having greatly a heat absorption, can consumingly draw the heat of contact object, if without pre- Heat enters directly in crystallizer, is easy for affecting metallurgical effect.

As optimization, also include the protective cover cooling structure for protective cover is realized with cooling.This is due to crystallizer smelting During refining, internal steam rises, and heat obtains protective cover, and protective cover temperature can be caused quickly to raise, therefore setting cooling structure Carry out cooling down the protected effect that can preferably improve to protective cover itself, it is to avoid damage because temperature is too high, extend protection Cover service life.

As optimization, described protective cover includes internal layer cover body and outer layer cover body, described air inlet pipe be communicated to outer layer cover body and Between internal layer cover body, described internal layer cover body is provided with gas outlet and connects internal layer cover body, between outer layer cover body and internal layer cover body Constitute protective gas preheating chamber, protective gas preheating chamber constitutes protective cover cooling structure after entering protective gas.

So, using very simply double-deck cover body structure, it is dexterously made to be simultaneously achieved above-mentioned charge heating and guarantor The double effectses of guard shield cooling protection, do not add extra cooling source and pre- thermal source, dramatically saves on cost.Simultaneously double-deck The structure of cover body is so that when in smelting process, there being any layer cover body damaged, protective cover can continue to using and continues to tie Gas shield atmosphere in brilliant device, carries out mending-leakage after terminating to smelting again, drastically increases gas shield in smelting process Reliability and safety.

As optimization, in described gas outlet, it is provided with escape pipe, escape pipe is located at inner side cover body lower position and escape pipe Outgassing direction is just arranged to crystallizer internal cavity obliquely.

So, gas outlet is set up escape pipe to be given vent to anger, give vent to anger in lower section inwardly can to better ensure that outgassing direction, carries High atmosphere protection effect.

As optimizing further, escape pipe horizontal plane vertical projection along space between electrode and crystallizer internal cavity in the middle of The tangential direction setting of circle.So, the protective gas of entrance can be along spatially spiral between electrode and crystallizer internal cavity to dirty Dynamic, realize atmosphere protection preferably to reach smelting position, improve atmosphere protection effect.

As optimizing further, in escape pipe, it is provided with one-way pressure valve, between outer layer cover body and internal layer cover body After accumulating certain gas pressure, just unidirectional escape pipe of opening is given vent to anger it is ensured that filling gas between outer layer cover body and internal layer cover body Quantity, to ensure cooling effect to protective cover.

As optimizing further, air inlet pipe and escape pipe are arranged at unilateral above crystallizer and are located at contrary direction.This The unilateral setting of sample escape pipe, is more favorable for the discharge of opposite side air, beneficial to the foundation of protective gas atmosphere, simultaneously air inlet pipe and Escape pipe is located at contrary direction, can extend flow path between two-layer cover body for the protective gas, preferably improve to guarantor The pre-heat effect of shield gas.

As optimizing further, described outer layer cover body upper end is additionally provided with the pump drainage feed channel of belt switch valve and the external world connects Logical.So, pump drainage feed channel can be first passed through before being passed through protective gas by evacuating air in double casing body so that double-deck cover body Bonded to each other, it is then shut off switch valve, then be passed through protective gas so that protective gas is packed into double casing body internal cavities, shape Enter into from escape pipe again after becoming certain pressure and in crystallizer, realize atmosphere protection.Thus can when being passed through protective gas more First fill full double casing body inner space well, protective gas pre-heat effect and protective cover that double-deck cover body has been better achieved are cold But effect.

In sum, this utility model has structure simply, is hardly damaged, atmosphere protection is stable, it is possible to increase smelt peace Quan Xing, improve metallurgical effect the advantages of.

Brief description

Fig. 1 is a kind of structural representation employing electroslag refining furnace of the present utility model.

Fig. 2 is the structural representation that in Fig. 1, separately protected cover portion is divided.

Specific embodiment

Employ electroslag refining furnace of the present utility model and its accompanying drawing with reference to one kind this utility model is made further Detailed description.

When being embodied as: as shown in Figure 1-2, a kind of electroslag refining furnace, including crystallizer 1, it is vertically arranged to crystallizer one The column 2 of side, is provided with horizontal cantilever 3, horizontal cantilever 3 is just provided with downwards to crystallizer by terminal clamp above column 2 The dummy electrode 4 extending, also includes the lowering or hoisting gear for driving horizontal cantilever elevating movement on column；Also include atmosphere protection Device, atmosphere protection device includes the protective cover 5 being arranged between dummy electrode 4 and crystallizer 1 upper end face and can air inlet arrive Air inlet pipe 6 in protective cover 5, its feature is, protective cover 5 upper end is fixedly connected on dummy electrode 4, and protective cover 5 is airtight Vertically flexible folding is obtained when making dummy electrode descending material, and protective cover can produce vertical folding shrinking.During enforcement, institute State lowering or hoisting gear and include a leading screw 7 being vertically set up in parallel with column, leading screw 7 is rotatably engaged to be arranged on and is fixed on laterally In one nut of cantilever 3, leading screw 7 lower end is connected with lifting motor 8 by reductor；So it is capable of to horizontal cantilever Elevating control, and structure is simple, controls reliable and stable.During enforcement, air inlet pipe and inert gas source are connected to crystallizer and provide guarantor Shield gas.During enforcement, protective cover, using being made using not firing exotic material, specifically can be preferably airtight asbestos cloth and obtain Arrive.

Wherein, protective cover 5 upper end is fixedly connected on dummy electrode 4 by a upper retainer ring 9, and upper retainer ring 9 is socketed in Dummy electrode is outer and bottom is the discoid connecting portion extending radially outwardly along dummy electrode, connects lower surface and protective cover upper end It is tightly connected, upper retainer ring 9 top is the fixed part extending axially upward along dummy electrode, fixed part is horizontally arranged with screw simultaneously Top screw is fixed on dummy electrode inwardly through screw, and upper retainer ring is additionally provided with bleed passage 10.

Wherein, upper retainer ring is additionally provided with disappointing governor motion, described disappointing adjustment structure includes a regulation of losing heart Bolt 11, disappointing regulating bolt 11 horizontally set and screw thread coordinate on the connecting portion of upper retainer ring, outside disappointing regulating bolt 11 End is exposed to connecting portion outer surface and constitutes regulation handle, and disappointing regulating bolt 11 is inner rotatable and axial limiting cooperation exists On one regulating block 12 being located within retainer ring, regulating block 12 the inner is located in bleed passage 10 and regulating block can be with disappointing The rotation of regulating bolt is displaced outwardly gradually to close bleed passage 10.

Wherein, it is additionally provided with sealing structure between upper retainer ring 9 and dummy electrode 4, upper sealing structure includes a protrusion It is formed at the spacing circle convex platform 13 of dummy electrode outer surface, also include being compressed in spacing circle convex platform 13 upper surface and upper fixation Upper sealing ring 14 between ring 9 lower surface.During enforcement, upper sealing ring 14 preferably employs high-temperature flame-proof cotton and obtains using the longevity to extend Life.

Wherein, protective cover 5 lower end is sealedly connected on crystallizer 1 upper end face by a discoid lower retainer ring 15, Air inlet pipe is arranged in lower retainer ring.

Wherein, the inner position of described crystallizer 1 upper end face is provided with the limited block 16 of the shape of falling l, described lower retainer ring 15 Medial part card pressure spacing in limited block 16, lower retainer ring 15 lateral part runs through by vertically arranged connecting bolt 17 and is connected to knot Brilliant device upper end, between lower retainer ring lower surface and crystallizer upper end face, pressure is provided with lower seal 18 and realizes sealing.

So so that lower retainer ring is quick and easy for installation, fix reliability and good sealing effect.During enforcement, lower seal 18 Preferably employ high-temperature flame-proof cotton to obtain to increase the service life.

Wherein, also include protective gas preheating structure, protective gas preheating structure includes a protective gas preheating chamber 19, described air inlet pipe 6 connects air inlet and reconnects air inlet to protective cover to protective gas preheating chamber 19 preheating.

Wherein, also include the protective cover cooling structure for protective cover is realized with cooling.This is because crystallizer was smelted Cheng Zhong, internal steam rises, and heat obtains protective cover, and protective cover temperature can be caused quickly to raise, therefore setting cooling structure is carried out Cooling can preferably improve the protected effect to protective cover itself, it is to avoid damages because temperature is too high, and extending protective cover makes Use the life-span.

Wherein, described protective cover includes internal layer cover body and outer layer cover body, and described air inlet pipe is communicated to outer layer cover body and internal layer Between cover body, described internal layer cover body is provided with gas outlet and connects internal layer cover body, constitute between outer layer cover body and internal layer cover body Protective gas preheating chamber, protective gas preheating chamber constitutes protective cover cooling structure after entering protective gas.

Wherein, it is provided with escape pipe 20 in described gas outlet, escape pipe 20 is located at inner side cover body lower position and escape pipe Outgassing direction is just arranged to crystallizer 1 inner chamber obliquely.

Wherein, escape pipe 20 horizontal plane vertical projection along space middle circle between electrode and crystallizer internal cavity tangent line Direction is arranged.So, the protective gas of entrance can flow downward along spatially spiral between electrode and crystallizer internal cavity, with more preferable Ground reaches smelting position and realizes atmosphere protection, improves atmosphere protection effect.

Wherein, it is provided with one-way pressure valve in escape pipe 20, for accumulating one between outer layer cover body and internal layer cover body After determining gas pressure, just unidirectional open escape pipe give vent to anger it is ensured that between outer layer cover body and internal layer cover body filling gas quantity, with Ensure the cooling effect to protective cover.

Wherein, air inlet pipe 6 and escape pipe 20 are arranged at unilateral above crystallizer and are located at contrary direction.So escape pipe Unilateral setting, is more favorable for the discharge of opposite side air, beneficial to the foundation of protective gas atmosphere, air inlet pipe and escape pipe position simultaneously In contrary direction, flow path between two-layer cover body for the protective gas can be extended, preferably improve to protective gas Pre-heat effect.

Wherein, described outer layer cover body upper end is additionally provided with the pump drainage feed channel 21 of belt switch valve and connects with the external world.So, lead to Pump drainage feed channel can be first passed through by evacuating air in double casing body so that double casing body is bonded to each other before entering protective gas, It is then shut off switch valve, then is passed through protective gas so that protective gas is packed into double casing body internal cavities, form certain pressure Enter into from escape pipe more afterwards and in crystallizer, realize atmosphere protection.Thus preferably first can fill when being passed through protective gas Full double casing body inner space, has been better achieved protective gas pre-heat effect and the protective cover cooling effect of double-deck cover body.

Claims

1. a kind of atmosphere protection device, atmosphere protection device includes the protection being arranged between dummy electrode and crystallizer upper end face Cover and can the air inlet pipe in protective cover for the air inlet it is characterised in that protective cover upper end is fixedly connected on dummy electrode, protective cover For gas impermeable material vertically flexible folding be obtained make dummy electrode descending when, protective cover can produce vertical folding shrinking.

2. atmosphere protection device as claimed in claim 1 is it is characterised in that protective cover upper end is fixed by a upper retainer ring It is connected on dummy electrode, upper Fixing shrink ring is connected on outside dummy electrode and bottom is the discoid company extending radially outwardly along dummy electrode Socket part, connects lower surface and protective cover upper end is tightly connected, and upper retainer ring top is along consolidating that dummy electrode extends axially upward Determine portion, fixed part is horizontally arranged with screw and top screw is fixed on dummy electrode inwardly through screw, in upper retainer ring also It is provided with bleed passage.

3. atmosphere protection device as claimed in claim 2 is it is characterised in that be additionally provided with disappointing regulation machine in upper retainer ring Structure, described disappointing adjustment structure includes a disappointing regulating bolt, disappointing regulating bolt horizontally set and screw thread coordinates upper solid Determine on the connecting portion of ring, disappointing regulating bolt outer end is exposed to connecting portion outer surface and constitutes regulation handle, lose heart and adjust spiral shell Bolt is inner rotatable and axial limiting coordinates on a regulating block being located within retainer ring, and regulating block the inner is located to lose heart and leads to In road and regulating block can be displaced outwardly with the rotation of disappointing regulating bolt gradually to close bleed passage.

4. atmosphere protection device as claimed in claim 2 is it is characterised in that be additionally provided between upper retainer ring and dummy electrode Sealing structure, upper sealing structure includes the spacing circle convex platform that a protrusion is formed at dummy electrode outer surface, also includes being compressed Upper sealing ring between spacing circle convex platform upper surface and upper retainer ring lower surface.

5. atmosphere protection device as claimed in claim 1 is it is characterised in that protective cover lower end is discoid lower solid by one Determine ring and be sealedly connected on crystallizer upper end face, air inlet pipe is arranged in lower retainer ring.

6. atmosphere protection device as claimed in claim 5 is it is characterised in that the inner position of described crystallizer upper end face is arranged Have a limited block of the shape of falling l, described lower retainer ring medial part card pressure spacing in limited block, lower retainer ring lateral part leans on vertically arranged Connecting bolt run through and be connected to crystallizer upper end, between lower retainer ring lower surface and crystallizer upper end face, pressure is provided with lower sealing Sealing realized by circle.

7. atmosphere protection device as claimed in claim 1 is it is characterised in that also include protective gas preheating structure, shielding gas Body preheating structure includes a protective gas preheating chamber, and described air inlet pipe connects air inlet to the preheating of protective gas preheating chamber Reconnect air inlet to protective cover.

8. atmosphere protection device as claimed in claim 1 is it is characterised in that also include the guarantor for protective cover is realized with cooling Guard shield cooling structure.

9. atmosphere protection device as claimed in claim 1 is it is characterised in that described protective cover includes internal layer cover body and outer layer cover Body, described air inlet pipe is communicated between outer layer cover body and internal layer cover body, described internal layer cover body is provided with gas outlet connects Layer cover body, constitutes protective gas preheating chamber between outer layer cover body and internal layer cover body, protective gas preheating chamber enters shielding gas Protective cover cooling structure is constituted after body.

10. atmosphere protection device as claimed in claim 9, it is characterised in that being provided with escape pipe in described gas outlet, is given vent to anger Pipe is located at inner side cover body lower position and escape pipe outgassing direction is just arranged to crystallizer internal cavity obliquely.