CN102883837B - Flux loading device, continuous casting device, flux loading method, and continuous casting method - Google Patents
Flux loading device, continuous casting device, flux loading method, and continuous casting method Download PDFInfo
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- CN102883837B CN102883837B CN201080066696.8A CN201080066696A CN102883837B CN 102883837 B CN102883837 B CN 102883837B CN 201080066696 A CN201080066696 A CN 201080066696A CN 102883837 B CN102883837 B CN 102883837B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
Abstract
A flux loading device is provided with a loading hopper for temporarily storing flux, and also with a supply pipe disposed in a tilted position in such a manner that the rear end thereof is connected to the loading hopper and the front end thereof is located above the inside of a mold. The height (H) from the surface of molten steel in the mold to the loading hopper is in the range of 0.5 m-3.0 m, inclusive, the minimum tilt angle (alpha) of the supply pipe relative to the horizontal direction is 20 degrees or more, and the angle (theta) of an imaginary rectilinear line connecting the flux discharge opening of the loading hopper and the lower part of the front end of the supply pipe relative to the horizontal direction is 54.6 x H-0.5 degrees or less.
Description
Technical field
The present invention relates to while to the liquid steel level supply flux in casting mold while the flux feeding device used when manufacturing strand and the continuous casting equipment possessing this flux feeding device.Moreover, the invention still further relates to the flux input method supplying flux in casting mold and the continuous casing employing this flux input method.
Background technology
In continuous casting equipment, by supplying to the liquid steel level injecting casting mold to give SiO
2with the flux (hereinafter referred to as powder) that CaO etc. is main component, the lubrication etc. preventing the oxidation of liquid steel level in casting mold, carry out the absorption of the field trash in casting mold in molten steel and then carry out between casting mold internal face and molten steel, while manufacture strand.In the supply of this powder, from the viewpoint of raising workability, propose device shown below.
Such as, patent document 1 discloses a kind of powder feeding device, it input hopper possessing supply powder and the input chute be connected with this input hopper, and gives this input chute to increase the inclination of the angle angle of repose of powder being had to some benefits.According to this powder feeding device, by making powder fall with deadweight via input chute, just can be dispersed in casting mold.
In addition, patent document 2 discloses a kind of powder feeding device, and it possesses the top ends that makes powder be dispersed in the rotary chute in casting mold and be arranged on this rotary chute and can at the movable top chute of direction action vertically.Moreover this powder feeding device has vibrating mechanism, powder can be dropped in casting mold not rely on its free-falling mode.According to this powder feeding device, while rotary chute rotates, movable top chute can be made in direction action vertically, thus can to stable supplying powder in casting mold.
In addition, in the past for guaranteeing the pig bed working space of continuous casting equipment, also method can be implemented as follows: be arranged on by the storage hopper storing particulate powder (flux) away from continuous casting casting mold (hereinafter also referred to as casting mold) place around, particulate powder be supplied in casting mold via from storage hopper to many carrier pipes of casting mold arranged in series.
Such as, in patent document 3 disclosed casting powder feeding device, 2 carrier pipes are in series communicated with connection, by between carrier pipe with transfer tube and two carrier pipes can free level be connected rotatably respectively each other.And then, CD-ROM drive motor being set at each connecting portion, connecting scattering ozzle to make its bending condition communication for the top of carrier pipe meanwhile.
In addition, Patent Document 4 discloses a kind of feedway cast continuously with powder, it is after the powder will transported from storage tank stirs, by this powder to powder feeding portion force feed, to the distribution ozzle supply powder that difference is multiple, meanwhile, by the Powder Recovery residual in powder feeding portion when powder switches to storage tank.
Also have, Patent Document 5 discloses a kind of powder feeding device cast continuously, it has powder storage hopper, the 1st tank, the 2nd tank and mechanical supplying machine, is connected between the 1st tank with the 2nd tank by removably joint.
Prior art document
Patent document
Patent document 1: Japanese Laid-Open 2004-306060 publication
Patent document 2: Japanese Laid-Open 2007-181845 publication
Patent document 3: the flat 11-285796 publication of Japanese Laid-Open
Patent document 4: the flat 1-118350 publication of Japanese Laid-Open
Patent document 5: the flat 1-215449 publication of Japanese Laid-Open
Summary of the invention
Invent problem to be solved
But there is following such problem that solve in conventional art disclosed in above-mentioned patent document 1 ~ 5.
That is, in the device of patent document 1 record, only regulation drops into the inclination angle of chute, and the altitude range of the beginning lowering position distance liquid steel level of powder does not specify.For this reason, because the height of the beginning lowering position with powder raises, speed during impacting powder liquid steel level increases, if so become too high, then likely there is liquid surface because of the liquid level of impacting powder molten steel.Under these circumstances, the product quality of strand may be caused to reduce because of liquid surface.
Further, in the device that patent document 2 is recorded, not use freely falling of powder, but use vibrating mechanism by the powder feeding in rotary chute in casting mold.But in the apparatus, there is the devices such as vibrating mechanism becomes obstacle when operating personnel carry out pig bed operation and the problem that increases of installation cost.And then, owing to not using freely falling of powder, so need the time by powder feeding to casting mold, when must promptly powder feeding be had problems to when liquid level in casting mold.
Also have, in the device that patent document 3 is recorded, by screw feeding device conveying hollow powder and particulate powder, but under being transported to remote situation, if make screw feeding device intermittent running at short notice according to casting situation, then above-mentioned powder efflorescence by nipping between screw rod and the pipe internal surface contained.Now, if put in casting mold by the powder of efflorescence, then the melting characteristic of powder changes from the original situation before efflorescence, and the lubrication of casting mold inner surface becomes unstable, operating trouble may occur.
As mentioned above, in device disclosed in these patent documents 1 ~ 3, when the supply of powder, the change of the liquid surface of molten steel and the melting characteristic of powder is a problem especially in the product quality improving strand, wishes the apparatus and method for solving this problem.
Furthermore, any one technology recorded in above-mentioned patent document 3 ~ 5 all mainly employs pneumatic convey when the conveying of powder, so when conveying granular powder, particulate powder is impacted and efflorescence to carrier pipe inner surface, there is the possibility occurring to block in carrier pipe.For this reason, the stable supplying of particulate powder can not be realized.And then, when like this in casting mold, supply the particulate powder of efflorescence, also there is the problem that slagability, lubricity and heat insulating ability become unstable.
As mentioned above, in device disclosed in these patent documents 3 ~ 5, the efflorescence of particulate powder prevents from being a problem especially in the product quality improving strand with taking into account of stable supplying, wishes the apparatus and method for solving this problem.
The present invention makes in view of the foregoing, its objective is the flux feeding device, continuous casting equipment, flux input method and the continuous casing that provide the product quality that can improve strand.
For solving the means of problem
The present invention realizes the object related in order to solve the problem, have employed following means.That is,
(1) flux feeding device of the present invention possesses the input hopper temporarily storing flux, to be connected with this input hopper with rear end and top is positioned at the inclined supply pipe of the mode of casting mold top, height dimension H from the liquid steel level in above-mentioned casting mold to above-mentioned input hopper is more than 0.5m and below 3.0m, above-mentioned supply pipe is more than 20 degree relative to the minimum cant α of horizontal direction, the imaginary line be connected with the lower position on the above-mentioned top of above-mentioned supply pipe by the outlet of the above-mentioned flux of above-mentioned input hopper is 54.6 × H relative to the angle θ that above-mentioned horizontal direction is formed
-0.5below degree.
(2), in the flux feeding device recorded in above-mentioned (1), also following formation can be adopted: above-mentioned supply pipe has the many straight tubes be connected to each other; In these straight tubes, the angle of inclination of the straight tube minimum relative to the angle of inclination of above-mentioned horizontal direction is above-mentioned minimum cant α.
(3) in the flux feeding device recorded in above-mentioned (1), the above-mentioned top of above-mentioned supply pipe can in following ranges in the position of above-mentioned horizontal direction: with the internal face position of the above-mentioned casting mold of position immediately below this supply pipe for benchmark, from towards the position of square 50mm in above-mentioned casting mold to the scope of the position of the foreign side 200mm towards this casting mold.
(4) the flux feeding device that above-mentioned (1) is recorded can also possess gas supply means, and described gas supply means is relative to the every 1cm in this supply pipe
2flow path cross sectional area is with more than 0 and be that the flow of less than 3 liters/min is blown into gas.
(5) continuous casting equipment of the present invention possesses wantonly 1 flux feeding device and above-mentioned casting mold recorded of above-mentioned (1) ~ (4).
(6), in the continuous casting equipment recorded in above-mentioned (5), the strand casting speed of above-mentioned casting mold also can be more than 0.6m/ minute.
(7) continuous casting equipment that above-mentioned (5) are recorded can also adopt following formation: this equipment also possesses: the storage hopper storing above-mentioned flux, from this storage hopper to the conveying conveying worm of the above-mentioned flux of conveying, accept the transfer hopper being carried the above-mentioned flux of coming by this conveying conveying worm, what arrange between this transfer hopper and above-mentioned input hopper transports with conveying worm, with the control device that the running carrying out above-mentioned conveying conveying worm controls, above-mentioned transporting uses the fed distance of conveying worm shorter than the fed distance of above-mentioned conveying conveying worm, the conveying capacity of above-mentioned conveying conveying worm is controlled to more than regulation conveying capacity with the stipulated time by above-mentioned control device.
(8), in the continuous casting equipment recorded in above-mentioned (7), above-mentioned to transport by the fed distance of conveying worm can be below 7m.
(9), in the continuous casting equipment recorded in above-mentioned (7), the afore mentioned rules time can be more than 2 minutes and less than 5 minutes, and afore mentioned rules conveying capacity can be in the scope of more than 1kg/ minute less than 20kg/ minute.
(10) in the continuous casting equipment recorded in above-mentioned (7), following formation can be adopted: above-mentioned conveying possess multiple conveying worm with conveying worm and configure between these conveying worms connect hopper, the conveying action of above-mentioned control device to above-mentioned each conveying worm individually controls.
(11) flux input method of the present invention makes flux fall by inclined supply pipe and is supplied to the liquid steel level in casting mold, from above-mentioned liquid steel level to above-mentioned flux, the height dimension H of lowering position is more than 0.5m and below 3.0m, above-mentioned supply pipe is more than 20 degree relative to the minimum cant α of horizontal direction, is 54.6 × H by the imaginary line that is connected between above-mentioned beginning lowering position and the position of the bottom, top of above-mentioned supply pipe relative to the angle θ that above-mentioned horizontal direction is formed
-0.5below degree.
(12) the flux input method that above-mentioned (11) are recorded can also possess relative to the every 1cm in this supply pipe
2flow path cross sectional area is with more than 0 and be the operation that the flow of less than 3 liters/min is blown into gas in above-mentioned supply pipe.
(13) continuous casing of the present invention comprises the operation using the above-mentioned liquid steel level in above-mentioned (11) or (12) above-mentioned casting mold of flux input side normal direction of recording to supply above-mentioned flux.
(14), in the continuous casing recorded in above-mentioned (13), the strand casting speed of above-mentioned casting mold also can be more than 0.6m/ minute.
(15) continuous casing recorded in above-mentioned (13) possesses: the operation above-mentioned flux being transported to transfer hopper from the storage hopper of this flux of storage through conveying conveying worm; With, so by this flux from above-mentioned transfer hopper through transporting the operation be supplied to conveying worm, above-mentioned input hopper and above-mentioned supply pipe in above-mentioned casting mold; Also above-mentioned transporting can be made to use the fed distance of conveying worm shorter than the fed distance of above-mentioned conveying conveying worm, make the conveying capacity of above-mentioned conveying conveying worm become more than regulation conveying capacity with the stipulated time.
(16), in the continuous casing recorded in above-mentioned (15), also can make that above-mentioned to transport by the fed distance of conveying worm be below 7m.
(17) in the continuous casing recorded in above-mentioned (15), the afore mentioned rules time can be made to be more than 2 minutes and less than 5 minutes, make afore mentioned rules conveying capacity be more than 1kg/ minute and in the scope of less than 20kg/ minute.
(18) in the continuous casing recorded in above-mentioned (15), above-mentioned conveying with conveying worm also can possess multiple conveying worm and configure between these conveying worms connect hopper, the conveying action of above-mentioned each conveying worm is individually controlled.
Invention effect
The flux feeding device that above-mentioned (1) according to the present invention is recorded, because the height dimension H of the beginning lowering position representing powder is confirmed as the suitableeest scope respectively with the angle θ that the imaginary line of the lower position being connected the top starting lowering position and supply pipe is formed relative to horizontal direction, so flux can be adjusted to the speed of the degree of the product quality reduction that can not cause being brought by liquid surface at the speed of impacting when liquid steel level.
In addition, supply pipe is defined as the suitableeest scope relative to the minimum cant α of horizontal direction, thus can prevent the blocking of the flux in supply pipe.Thus, cheap supply pipe can be used to implement to supply the flux of the liquid steel level in casting mold, and the obstacle of operation can not be become, the liquid surface of molten steel can also be suppressed simultaneously, improve the quality of product further.
Above-mentioned (2) record flux feeding device when because multiple straight tube can be connected and form supply pipe, thus can change the landline of flux according to the environment of surrounding.Further, in each straight tube, by using the angle of inclination relative to horizontal direction be the angle of inclination of minimum straight tube as above-mentioned minimum cant α, even if use multiple straight tube, also can prevent the flux in supply pipe from blocking.
Above-mentioned (3) record flux feeding device when, position in the horizontal direction, the top of supply pipe is in following ranges: with the internal face position of casting mold for benchmark, scope from the position of 50mm square in casting mold to the position of the foreign side 200mm towards this casting mold, thus, can prevent supply pipe from mutually disturbing with dipping ozzle.Therefore, the controlling organization arranged for preventing the complexity disturbed is not needed.
Above-mentioned (4) record flux feeding device when, except produced by the deadweight of flux naturally fall except, also secondarily by gas supply means to supply gas in supply pipe, thus more stably can implement the supply of the flux to the liquid steel level in casting mold.
According to the continuous casting equipment that above-mentioned (5) are recorded, owing to possessing any one flux feeding device recorded of above-mentioned (1) ~ (4), the liquid surface caused by the supply of flux thus effectively can be suppressed.So, strand product quality can be improved.
Above-mentioned (6) record continuous casting equipment when, if the casting speed of strand becomes more than 0.6m/ minute, then the liquid surface of molten steel just becomes easy generation, but owing to having flux feeding device of the present invention, thus can suppress the liquid surface caused by the input of flux.So effect of the present invention can display more significantly.
Above-mentioned (7) record continuous casting equipment when, owing to arranging transfer hopper at conveying conveying worm and between transporting with conveying worm, thus can with transfer hopper for boundary, the conveying conveying worm of side configuration is according to the amount of the flux (such as particulate powder) in transfer hopper at its upstream, and use conveying worm according to casting situation in transporting of downstream configuration, individually adjust the conveying capacity of flux respectively.
Usually, by transporting with conveying worm, if from transfer hopper through dropping into hopper and supply pipe, (namely flux (such as particulate powder) to be respectively supplied in casting mold with ormal weight, carry out the intermittent running of pole short-term), then the pulverization rate of flux rises.For this reason, in the past, the melting speed of the flux supplied in casting mold became unstable, forms uneven melting layer, stably can not promote the formation of solidified shell at liquid steel level, and operation becomes unstable.On the other hand, in the present invention, running up of short time is become owing to making conveying conveying worm, make to transport and use the fed distance of conveying worm shorter than the fed distance of conveying conveying worm, even if transport with conveying worm so use with the intermittent running of very short time, the efflorescence being supplied to the flux in casting mold from storage hopper also can be suppressed.Consequently, the efflorescence can seeking flux prevents and the taking into account of stable supplying.So, slagability when supplying flux in casting mold and lubricity and heat insulating ability can be maintained good state, stable casting can be implemented.
Above-mentioned (8) record continuous casting equipment when, be below 7m owing to transporting by the fed distance of conveying worm, so can be reduced further by the pulverization rate transporting the particulate powder caused with the running of conveying worm.
Above-mentioned (9) record continuous casting equipment when, due to the conveying capacity of duration of runs and flux of suitably specifying conveying conveying worm, thus effectively can reduce the pulverization rate of the flux caused by the running of conveying conveying worm further.At this, when being reduced to below 15 quality % by the pulverization rate of the flux supplied in casting mold, the slagability of flux and lubricity and heat insulating ability can be made further to be in good state.
Above-mentioned (10) record continuous casting equipment when, such as, even from the longer situation of fed distance storage hopper to casting mold or there is barrier in the midway of landline, also multiple for multiple conveying worm connection can be built the landline of suitable flux.Consequently, can prevent in the efflorescence seeking flux with the taking into account of stable supplying while carry.
According to the flux input method that above-mentioned (11) are recorded, the flux that can obtain recording with above-mentioned (1) enters the same action effect of device.Namely, because the height dimension H of the beginning lowering position representing powder can be determined in the suitableeest scope respectively with the angle θ that the imaginary line of the lower position being connected the top starting lowering position and supply pipe is formed relative to horizontal direction, speed when thus flux can be impacted liquid steel level adjusts to the speed of the degree of the reduction that can not cause the product quality brought by liquid surface.
In addition, because supply pipe is defined as the suitableeest scope relative to the minimum cant α of horizontal direction, thus can prevent the flux in supply pipe from blocking.Accordingly, can use cheap supply pipe, the flux implemented to the liquid steel level in casting mold supplies, and can not become the obstacle of operation, can suppress the liquid surface of molten steel, further Improving The Quality of Products simultaneously.
Above-mentioned (12) record flux input method when, carry out except utilizing the deadweight of flux naturally fall except, by secondarily supply gas, more stably can also implement to the liquid steel level supply flux in casting mold.
Above-mentioned (13) record continuous casing when, owing to employing the flux input method that above-mentioned (11) or (12) are recorded, thus effectively can suppress the liquid surface brought by the supply of flux.So, the product quality of strand can be improved.
Above-mentioned (14) record continuous casing when, if the casting speed of strand becomes more than 0.6m/ minute, then the liquid surface of molten steel becomes easy generation, but because have employed flux input method of the present invention, thus can suppress the liquid surface brought by the input of flux.So effect of the present invention can display more significantly.
Above-mentioned (15) record continuous casing when, owing to getting involved transfer hopper at conveying conveying worm with between transporting with conveying worm, thus can with transfer hopper for boundary, the conveying conveying worm of side configuration is according to the amount of the flux (such as particulate powder) in transfer hopper at its upstream, and downstream configuration transport by the carry out situation of conveying worm according to casting manipulations, individually adjust the conveying capacity of flux respectively.
In general, if pass through input hopper and supply pipe with conveying worm from transfer hopper by transporting, flux (such as particulate powder) is respectively supplied to (if that is, carrying out the intermittent running of short time) in casting mold with ormal weight, then the pulverization rate of flux rises.For this reason, in the past, the melting speed of the flux supplied in casting mold became unstable, forms uneven melting layer, stably can not promote the formation of solidified shell at liquid steel level, and operation becomes unstable.On the other hand, in the present invention, running up of short time is become owing to making conveying conveying worm, make to transport and use the fed distance of conveying worm shorter than the fed distance of conveying conveying worm, even if transport with conveying worm so use with the intermittent running of short time, the efflorescence being supplied to the flux in casting mold from storage hopper also can be suppressed.Consequently, the efflorescence can seeking flux prevents and the taking into account of stable supplying.So slagability when flux can be supplied in casting mold and lubricity and heat insulating ability maintain good state, implement stable casting.
Above-mentioned (16) record continuous casing when because making to transport by the fed distance of conveying worm is below 7m, thus can reduce further by the pulverization rate transporting the particulate powder brought with the running of conveying worm.
Above-mentioned (17) record continuous casing when, due to the duration of runs of conveying conveying worm and the conveying capacity of flux can be controlled suitably, the pulverization rate of the flux brought by the running of conveying conveying worm thus more effectively can be reduced.At this, when being reduced to below 15 quality % by the pulverization rate of the flux be supplied in casting mold, the slagability of flux, lubricity and heat insulating ability can be made to be in better state.
Above-mentioned (18) record continuous casing when, such as, even the situation longer from the fed distance storage hopper to casting mold and the midway of landline exist barrier, also multiple conveying worm can be connected and constructs suitable flux delivery route.Consequently, can prevent in the efflorescence seeking flux with the taking into account of stable supplying while carry.
Accompanying drawing explanation
Fig. 1 is the side view of the machines configurations representing the continuous casting equipment possessing flux feeding device of the first embodiment of the present invention.
Fig. 2 is the longitudinal section of the position relationship of the liquid steel level represented in the supply pipe of this flux feeding device and casting mold.
Fig. 3 is the chart of the relation of liquid level impact velocity when representing that flux (powder) impacts liquid steel level and liquid surface amount.
Fig. 4 represents the beginning lowering position of flux be connected angle θ that imaginary line formed relative to horizontal direction with the lower position on the top of supply pipe and start the height dimension H of distance liquid steel level of lowering position to the chart of the impact that liquid surface amount produces.
Fig. 5 is the side view of the machine location representing continuous casting equipment of the second embodiment of the present invention.
Fig. 6 is the side view of the variation representing this continuous casting equipment.
Fig. 7 represents the fed distance of flux (particulate powder) of the screw feeding device utilizing method of operation different and the key diagram of the relation of its pulverization rate.
Fig. 8 is the figure of the embodiment representing present embodiment, is the key diagram of the method for operation of the screw feeding device representing low operation and the method for operation of the high screw feeding device run.
Fig. 9 is the key diagram of the relation representing the method for operation of screw feeding device and the pulverization rate of particulate powder.
Detailed description of the invention
Each embodiment of flux feeding device of the present invention, continuous casting equipment, flux input method and continuous casing is below described, but certain the present invention is not only limited to these.
[the 1st embodiment]
As illustrated in figures 1 and 2, the continuous casing employing the flux input method of present embodiment is that limit makes flux (hereinafter referred to as powder 10) pass through the supply pipe 11 of the tubular oliquely downward tilted and freely fall, be supplied on the liquid steel level 13 in casting mold 12, limit manufactures the method for strand, be the obstacle of the operation that can not become in pig bed, can simply to be formed the liquid surface suppressing molten steel, the method that can improve strand product quality.
In addition, the continuous casting equipment possessing the flux feeding device of present embodiment in order to implement this continuous casing possesses: store the storage hopper 15 of powder 10, to be connected with the lower end of this storage hopper 15 and the down-comer 16 extended immediately below vertical direction, to be connected with the lower end of this down-comer 16 and the transfer tube 17 extended in the horizontal direction, the flux feeding device 1 be connected with the top of this transfer tube 17, accept the input of the powder 10 from flux feeding device 1 casting mold 12 and be configured in this casting mold 12 top tundish 19 and flood ozzle 20.
Above-mentioned flux feeding device 1 possesses and accepts carry the powder of the powder 10 of coming input hopper 18 from transfer tube 17 and be connected and inclined supply pipe 11 with the lower end that this powder drops into hopper 18.It is inclined that supply pipe 11 drops into according to its rear end and powder the mode that hopper 18 is connected, on the other hand top is positioned at the inner upper of casting mold 12.
In addition, as the powder 10 used in the present embodiment, comprise as the hollow powder being formed with the hollow form in space in inside of known powder, granular particle powder, pulverous powder.
Powder 10 is fallen by deadweight, has been installed the transfer tube 17 of screw feeding device by inside after being transported in right amount from the storage hopper 15 be arranged on tundish support 14 in down-comer 16, is transported to powder and drops into hopper 18.Then, drop into the lower end of hopper 18 from powder, be fed on liquid steel level 13 by deadweight through supply pipe 11.
Supply pipe 11 is pipe arrangements that the lower end position dropping into hopper 18 from powder tilts to liquid steel level 13, freely falls as prerequisite to make powder 10.About the formation of supply pipe 11 and the details of configuration, be described following.
Supply pipe 11 is formed by being connected in series by the straight tube 21 ~ 24 of many (present embodiment is 4), is bent to multiple stage.More particularly, supply pipe 11 possesses: be connected with the lower end that powder drops into hopper 18 and the straight tube 21 vertically extended below direction, be connected and oliquely downward inclined straight tube 22, be connected with the lower end of this straight tube 22 and the straight tube 23 vertically extended below direction and being connected with the lower end of this straight tube 23 and the straight tube 24 configured towards the inclined upward of the liquid steel level 13 in casting mold 12 with the lower end of this straight tube 21.In addition, the quantity forming the straight tube of supply pipe 11 is not 4 that are only defined in present embodiment, such as, according to the environmental condition of the surrounding of supply pipe 11, can be formed with more than 2 or 3 and then 5 (upper limit is such as about 10) yet.
Form this supply pipe 11 each straight tube 21 ~ 24 in, the straight tube 24(minimum relative to the angle of inclination of horizontal direction is positioned at the straight tube of most downstream) minimum cant α become more than 20 degree.
At this, when minimum cant α is less than 20 degree, although have deviation according to the kind of powder 10, the possibility that the blocking of powder 10 occurs in supply pipe 11 is high.Further, when minimum cant α is less than 20 degree, in pig bed, become obstruction when operating personnel work.For this reason, preferred minimum cant α is more than 30 degree, is more preferably more than 35 degree.
In addition, in the present embodiment, the situation angle of inclination of the straight tube 24 being positioned at the most downstream side forming supply pipe 11 being set to above-mentioned tilt angle alpha is illustrated, but the angle of inclination being configured in the side, most upstream of supply pipe 11 or the straight tube of middle part also can be made minimum, and it can be used as minimum cant α.This is because, arranging minimum cant α prevents the blocking of powder 10 from occurring as object, in multiple straight tube 21 ~ 24, if regulation is the minimum cant α of minimum straight tube relative to the angle of inclination of horizontal direction, even if then for other straight tube not special provision, also can prevent the blocking of powder 10 from occurring.
In addition, in the present embodiment, in the straight tube forming supply pipe 11, be included in the straight tube 21,23 of vertical direction configuration, but, also can not use these straight tubes 21,23, only use and be more than 20 degree and the straight tube inclined less than 90 degree relative to the angle of inclination of horizontal direction.
In addition, supply pipe 11 is not only limited to and is connected in series by multiple straight tube 21 ~ 24 as in the present embodiment and the supply pipe that forms, and 1 straight tube that also just can form straight line shape is formed (diagram is omitted).Now, this straight tube becomes above-mentioned minimum cant α relative to the angle of inclination of horizontal direction.
And then supply pipe 11 is not only limited to straight tube, can form with the swan-neck of more than 1 or 2 being formed as arc-shaped (omitting diagram).The minimum cant α of this situation can represent by the angle that the tangent line of the downstream side end of above-mentioned swan-neck is formed relative to horizontal direction.In addition, swan-neck also can be used as 1 part of the multiple straight tubes forming supply pipe 11.
Supply pipe 11 described above is by the beginning lowering position H of powder 10
t, namely drop into the height dimension H(of distance liquid steel level 13 of the terminus position of the supply pipe 11 that hopper 18 is connected with powder hereinafter also referred to as height dimension H) be arranged on more than 0.5m and in the scope of below 3m.And then, in this supply pipe 11, connection is started lowering position H
tthe angle θ (hereinafter also referred to as " the angle θ of formation ") formed relative to horizontal direction with the imaginary line (two chain-dotted lines shown in Fig. 1) of the top lower position (hereinafter referred to as apical position P) of supply pipe 11 is set as by 54.6 × H
-0.5below the angle obtained.So as can be seen from Figure 1, the relation of the angle θ of minimum cant α and formation is, the angle θ of formation necessarily becomes more than minimum cant α (θ >=α).At this, the present inventors's new discovery, if the angle θ formed is too large, when then supplying powder 10 in casting mold 12, except when powder 10 falls in casting mold 12, powder flies upward, beyond aggravating working environment, cause the increase of the liquid surface amount be associated with the deterioration of Slab quality sometimes.
Below, the reason for the angle θ defining height dimension H and formation is as mentioned above described.
First, liquid level impact velocity V when impacting to liquid steel level for powder and the relation of liquid surface amount now, be described with reference to Fig. 3.In addition, powder uses hollow powder and particle powder these 2 kinds.
In general, if liquid surface amount is little, then Slab quality (internal flaw such as bubble, field trash) improves.
Known to Fig. 3, when casting speed is more than 0.6m/ minute, if the liquid level impact velocity V of powder exceedes about 3.4m/ second, then the increase of liquid surface amount becomes obvious.From this situation, the liquid level impact velocity V of powder must be made to be below 3.4m/ second.
In addition, if compare the situation (hereinafter referred to as case 1) of more than casting speed 0.6m/ minute and the situation (hereinafter referred to as case 2) of casting speed 0.3 ~ 0.5m/ minute, then case 1 is compared with case 2, and the minimizing effect of liquid level impact velocity is larger.Namely, if the liquid level impact velocity comparing both to reduce to the minimizing ratio of the liquid surface amount of the situation of 3.4m/ second second from 4m/, then the minimizing ratio of the liquid surface amount of case 2 is approximately 1/2(=2mm/4mm), on the other hand, the liquid surface amount of case 1 is 1/3(=5mm/15mm), can confirm, a side of case 1 shows and significantly improves compared with case 2.Thus can confirm, casting speed is that the situation of more than 0.6m/ minute can show effect of the present invention more.
As mentioned above, according to the present embodiment, owing to liquid surface amount can be suppressed at below 5mm, thus preferred Slab quality can be maintained.
Secondly, at the height dimension h(of the distance liquid steel level 13 of the apical position P by supply pipe 11 with reference to Fig. 2) when being adjusted within the scope of 100 ~ 300mm, become the angle θ of such below above-mentioned formation 3.4m/ second and above-mentioned height dimension H(with reference to Fig. 1 about the liquid level impact velocity having investigated powder 10) the result of relation, be described with reference to Fig. 4.In addition, height dimension H to change in below 3m scope at more than 0.5m.In addition, the molten steel that can be 350 tons by every 1 charging is set as 2 chargings, strand casting speed is set to 1.2m/ minute to cast.
Illustrated in Fig. 4, the mode becoming below 3.4m/ second with the liquid level impact velocity V of powder 10 change the angle θ of formation and the situation of height dimension H experimental result (zero mark in figure) and by calculating the solid line obtaining the curve meeting this experimental result.This solid line is proximal line, has θ=54.6 × H
-0.5relation.
Like this, due to θ=54.6 × H
-0.5become for keeping liquid surface amount to be the critical condition of below 5mm, so make the angle θ of formation be 54.6 × H
-0.5(θ≤54.6 × H below degree
-0.5).
In addition, Fig. 4 also shows about the use powder of hollow and the powder of particle, carries out various change to the angle θ formed and height dimension H, and the result measuring liquid surface amount and obtain.In addition, in the diagram, "○" mark represents that liquid surface amount is the result of below 5mm, and "×" mark represents the result of liquid surface amount more than 5mm.
From this Fig. 4, measurement result and the above-mentioned result of calculation of liquid surface amount meet well.Further, when employing any one powder of hollow and particle, the angle θ formed by regulation, also achieving liquid surface amount is below 5mm.In addition, because the situation lower deviation of in use empty powder is little especially, the precision of prediction of liquid surface amount improves, so particularly preferably use hollow powder.
Can confirm from above result, the beginning lowering position H of powder 10 must be made
tthe height dimension H of distance liquid steel level 13 is more than 0.5m and in the scope of below 3m, the angle θ of formation is 54.6 × H
-0.5below degree.
In addition, if consider the environment for use etc. of supply pipe 11, then the lower limit of preferred heights size H is 1m.Further, in order to suppress liquid surface amount further, the angle θ be preferably formed is 50 × H
-0.5below degree, and then the angle θ more preferably formed is 45 × H
-0.5below degree.
As represented in Fig. 2, when side-looking supply pipe 11, its apical position P is configured to make falling a little in casting mold 12 of powder 10.On the other hand, when overlook this supply pipe 11, preferably the apical position P of supply pipe 11 is located in following ranges: using the internal face position F of casting mold 12 as benchmark, from the scope of the position R1 to the position R2 of the foreign side 200mm towards casting mold 12 towards liquid steel level 13 side (upper side of liquid steel level 13) 50mm.In addition, the height dimension h of the apical position P of supply pipe 11 distance liquid steel level 13 is described above, such as, preferably at more than 100mm and in below 300mm scope.
Such as, the inner space manufacturing the casting mold 12 of strand has the rectangular shape on the long limit of minor face and about the 1000mm possessing about 250mm when overlooking.So the outside dimension being configured in the dipping ozzle 20 in this casting mold 12 is about 120mm.Supply pipe 11 in order to the long side synform growth limit from casting mold 12 internal face and dipping ozzle 20 between supply powder 10, to 65mm(=(250mm-120mm) mouth/2) and left and right gap supply powder 10.
So, when the apical position P of supply pipe 11 being configured in the position towards liquid steel level 13 side more than 50mm compared with above-mentioned internal face position F, there is the obstacle that supply pipe 11 disturbs dipping ozzle 20, need the controlling organization of the complexity for avoiding this interference, so be not preferred.
On the other hand, when the apical position P of supply pipe 11 to be configured in compared with above-mentioned internal face position F towards the position of the foreign side of casting mold 12 more than 200mm, be under the condition of below 3.4m/ second in liquid level impact velocity, can not reliably make powder 10 fall in casting mold 12.For this reason, powder 10 is dispersed in the periphery of casting mold 12, may become the blocking of cooling ozzle (not shown) of the continuous casting machine in the downstream being configured in casting mold 12 and the reason of the deterioration of dust atmosphere.
According to above content, when overlooking supply pipe 11, its apical position P is arranged in following ranges: using the internal face position F of casting mold 12 as benchmark, from the scope of the position R1 to the position R2 of the foreign side 200mm towards casting mold 12 towards liquid steel level 13 side 50mm.But, casting mold 12 and other surrounding devices is disturbed in order to prevent supply pipe 11, get rid of the obstacle that the situation of liquid steel level 13 is monitored, be more preferably and above-mentioned position R1 is set in following ranges: using the internal face position F of casting mold 12 as benchmark, from the scope of (from the extended line of internal face above vertical direction) directly over towards the position of liquid steel level 13 side 20mm to the internal face position F of casting mold 12.
In addition, the horizontal direction of the apical position P of supply pipe 11 and the location of short transverse in fact also can be used for be decided to powder 10, but also the speed of the powder 10 flown out from supply pipe 11 etc. can be substituted into equation of motion to simulate, and determine according to its result.
In addition, the input of powder 10 utilizes its deadweight to carry out substantially, but as the auxiliary effect that it drops into, also gas (such as, air) can be blown in supply pipe 11.The gas flow of this situation is preferably relative to the every 1cm in supply pipe 11
2flow path cross sectional area is more than 0 and be less than 3 liters/min.
If carry out being blown into of complementary gas in supply pipe 11, then reliably can prevent the blocking in the supply pipe 11 that may produce because of the kind (such as, the state of hollow, particle, powder etc. and particle diameter) of the powder used.That is, by being blown into assist gas in supply pipe 11, the flowing of the powder 10 in supply pipe 11 can be promoted, more stably powder 10 is supplied in casting mold 12.
In addition, make that the angle θ of formation is 30 degree, height dimension H is 1m, be adjusted to 1,2,3 liter/min respectively by being blown into flow to the gas in supply pipe 11, when carrying out the supply of powder 10, both can not produce dust, powder 10 also can not distribute to periphery.But if gas becomes more than 4 liters/min to the flow that is blown in supply pipe 11, then liquid surface quantitative change is large, meanwhile, produce dust, surrounding environment worsens.So known, being blown into relative to the every 1cm in supply pipe 11 in supply pipe 11
2when the gas of flow path cross sectional area more than 3 liters/min, surrounding environment is caused to worsen due to the dust of powder 10.
According to above content, the suitable flow of the gas flowed in supply pipe 11 is set to relative to the every 1cm in supply pipe 11
2sectional area, more than 0 and be less than 3 liters/min.In addition, lower limit is more preferably set to 11 liters/min by the suitable flow of this gas, the upper limit is set to 2 liters/min.
In casting mold 12, on one side powder 10 is supplied at use supply pipe 11, while when manufacturing strand, if the strand casting speed of being undertaken by casting mold 12 is set to more than 0.6m/ minute, then as described above, the inhibition of liquid surface during powder feeding is obvious especially.
At this, when casting speed is less than 0.6m/ minute, because the flowing of the liquid steel level 13 in casting mold 12 is slow, liquid surface amount is natively little, so the inhibition of liquid surface during powder feeding can not occur significantly.On the other hand, accelerate with casting speed, the inhibition according to liquid surface during powder feeding of the present invention occurs significantly, although so about higher limit not regulation, but also can be the casting speed used in common operation, such as using 3m/ minute as the upper limit.
According to above-mentioned reason, with the lower limit of the casting speed of strand for 0.6m/ minute, but be more preferably 0.8m/ minute, more preferably 1.0m/ minute.
According to the flux feeding device of present embodiment described above, continuous casting equipment, flux input method and continuous casing, for simply forming and method, the obstacle of pig bed operation can not be become, the liquid surface of molten steel can be suppressed, powder 10 can be supplied to liquid steel level again, the product quality of strand can be improved.
2nd embodiment
Then, with reference to appended accompanying drawing, the 2nd embodiment of the present invention is below described.
As shown in Figure 5, the control device (not shown) that the continuous casting equipment of present embodiment possesses continuous casting mould powder conveying device 110, the running of carrying out the conveying screw feeding device 118 etc. of this conveying device 110 control and casting mold 12 etc.
First, about employ flux input method of the present embodiment flux feeding device, possess this flux feeding device continuous casting equipment, to make the continuous casing that Let Chu carries out according to this Lian Xuzhu, be described following.
As shown in Figure 5, the conveying device (being also called for short conveying equipment below) 110 of the continuous casting mould powder of present embodiment possesses in the following order: along the throughput direction of the particulate powder used in the continuous casing utilizing continuous casting equipment (flux) and the storage hopper 111 configured, screw feeding device (example of conveying worm) 112, connect hopper 113, screw feeding device (example of conveying worm) 114, transfer hopper 115, transport with screw feeding device (transporting an example with conveying worm) 116, as the whirligig 117 of the flux feeding device of present embodiment.
2 the screw feeding devices 112 and 114 being positioned at transfer hopper 115 upstream side form conveying screw feeding device (example of conveying conveying worm) 118.In addition, about each screw feeding device 112,114 with transport with screw feeding device 116, the structure of the internal diameter size of their carrier pipe and screw rod (not shown) is same, but also can be different.
Particulate powder stored by storage hopper 111.
The upstream-side-end of the screw feeding device 112 inclined obliquely upward from this bottom is provided with in the bottom of this storage hopper 111.Screw feeding device 112 makes the particulate powder in storage hopper 111 carry obliquely upward and passes through to connect hopper 113.Then, the particulate powder passed through from connection hopper 113 utilizes screw feeding device 114 to be transported to transfer hopper 115.In addition, although connect hopper 113 only there is the function making particulate powder pass through, the function of temporarily storage granules sprills can also be had.Now, according to the particulate powder amount connected in hopper 113, to connect hopper 113 for boundary, the running of adjacent screw feeding device 112,114 can be controlled respectively.
In present embodiment, be illustrated about the situation being configured with 2 screw feeding devices 112,114 between storage hopper 111 and transfer hopper 115.But as shown in Figure 6, also by being arranged at 1 conveying screw feeding device (example of conveying conveying worm) 119 of storage hopper 111, directly can be connected between storage hopper 111 with transfer hopper 115.More specifically, connect the upstream-side-end of 1 conveying screw feeding device 119 in the lower end of storage hopper 111, further the end of downstream side of this conveying screw feeding device 119 is connected to transfer hopper 115.
Transfer hopper 115 is storage granules sprills temporarily.
Not shown level meter is set in this transfer hopper 115, the storage capacity of the particulate powder in transfer hopper 115 can be measured.
By arranging transfer hopper 115, the screw feeding device 112,114 of its upstream side can according to the amount of the particulate powder in transfer hopper 115 (namely, under prerequisite lower than the lower limit pre-set of the reserves of particulate powder), the particulate powder in storage hopper 111 is transported in transfer hopper 115.
In addition, be in transporting of the downstream of transfer hopper 115 and can carry out situation according to casting manipulations with screw feeding device 116, each with ormal weight conveying granular powder in casting mold 12.
Whirligig 117 has: by transport with screw feeding device 116 supply particulate powder input hopper 120 and from the bottom of this input hopper 120 oliquely downward inclined, make to be supplied to the input chute 121 that the particulate powder dropping into hopper 120 was freely fallen by its deadweight and be supplied to the supply pipe of the liquid steel level 13 in casting mold 12.
Drop into chute 121 and be bent into L-shaped when side-looking, so by make input chute 121 with drop into the connecting portion of hopper 120 using the axle center along its vertical direction as center rotating, particulate powder can be spread to arc-shaped on the liquid steel level 13 in casting mold 12.
In addition, be such as more than 7m below 30m from storage hopper 111 to the distance (fed distance of particulate powder) of the upper end of casting mold 12.At this, above-mentioned apart from when less than 7m, the working space of the pig bed being provided with casting mold 12 cannot be guaranteed fully.On the other hand, when above-mentioned distance is more than 30m, the pulverization rate of particulate powder when using each screw feeding device long-distance sand transport particulate powder sharply rises.So, as above-mentioned distance, preferably more than 7m below 30m.
Further, drop into chute 121 relative to the liquid steel level 13 in casting mold 12, configure substantially samely with the supply pipe 11 of above-mentioned 1st embodiment.That is, are more than 0.5m below 3.0m from the liquid steel level 13 in casting mold 12 to dropping into the height dimension H of hopper 120; Dropping into chute 121 is more than 20 degree relative to the minimum cant α of horizontal direction; The angle θ that the imaginary line of the outlet connecting the particulate powder dropping into hopper 120 and the top lower position dropping into chute 121 is formed relative to horizontal direction becomes 54.6 × H
-0.5below degree.And then in present embodiment, the angle of inclination of dropping into chute 121 becomes minimum cant α.
Then, about the flux input method (employing the continuous casing of continuous casting equipment) of the flux feeding device of use present embodiment, the conveying equipment 110 with reference to above-mentioned continuous casting mould powder is described.
In the continuous casing of present embodiment, the particulate powder that uses in continuous casting, from storing hopper 111, through conveying screw feeding device 118, is connected hopper 113 and screw feeding device 114, is transported to transfer hopper 115.And then, from this transfer hopper 115, through transporting with screw feeding device 116, dropping into hopper 120 and drop into chute 121, respectively supply in casting mold 12 with ormal weight.Now, flux input method according to the present embodiment, can suppress and then prevent the efflorescence of particulate powder.
Particulate powder can be such as the powder etc. of the hollow form in formation space, inside, and its average grain diameter is more than 200 μm and less than 400 μm (and then lower limit is 250 μm, the upper limit is 350 μm) left and right.Further, the particulate powder used in the present embodiment comprises powder as the hollow form in formation space, inside of known powder and granular powder, but only have pulverous powder by except.
Below, the continuous casing comprising the control running that the control device that utilizes the continuous casting apparatus of present embodiment to possess carries out is described.
First, run successively by the screw feeding device 114 and screw feeding device 112 that make the formation conveying screw feeding device 118 being positioned at transfer hopper 115 upstream side, particulate powder is transported to transfer hopper 115 from storage hopper 111, by the above-mentioned level meter arranged in transfer hopper 115, when detect learn that the storage capacity of particulate powder in transfer hopper 115 becomes below the lower limit that pre-sets, automatically can carry out this conveying.Thus, the storage capacity of the particulate powder in transfer hopper 115 can be made automatically to recover.
Further, running with screw feeding device 116 by making to be positioned at transporting of transfer hopper 115 downstream, the particulate powder in transfer hopper 115 being transported to and dropping into hopper 120.In addition, this conveying is carried out situation to carry out according to casting manipulations.
Thus, by making input chute 121 to rotate as center along the axle center of the vertical direction dropping into hopper 120, particulate powder can through from input hopper 120 and input chute 121, spreading to equably in casting mold 12.
As described above, storage capacity particulate powder being transported to the particulate powder of conveying screw feeding device 118 just in transfer hopper 115 of transfer hopper 115 tails off, its running is carried out.For this reason, after the conveying of the particulate powder of transfer hopper 115 terminates, until the time interval then particulate powder being transported to transfer hopper 115 is longer, the operation ratio of each screw feeding device 112,114 is low (hereinafter also referred to low operation).
On the other hand, particulate powder is transported to transporting of hopper 120 of input to operate by the situation of carrying out of screw feeding device 116 according to casting manipulations.For this reason, must frequently and in the short time, intermittently carry out conveying and the stopping of particulate powder, transport with the operation ratio of screw feeding device 116 high (running hereinafter also referred to height).
So, by arranging transfer hopper 115 at conveying screw feeding device 118 with between transporting with screw feeding device 116, can with transfer hopper 115 for boundary, the method for operation changing conveying screw feeding device 118 and transport with screw feeding device 116.
Specifically, the conveying screw feeding device 118 of low operation such as can carry out by with more than 10 minutes and the time interval of less than 30 minutes carry out 1 time and carry out more than 2 minutes and the short-time running of less than 5 minutes (that is, operating continuously) and the conveying capacity of particulate powder is such as set to every 1 minute for more than 1kg and the running up of below 20kg.In addition, high run transport with screw feeding device 116 such as can carry out by with more than 10 seconds and the time interval of less than 1 minute carry out 1 time and carry out more than 10 seconds and the very short time of less than 1 minute operates (that is, intermittent running) and the conveying capacity of particulate powder is such as set to every 1 minute and is more than 0.1kg and below 3kg, carry out the low-speed running more less than the conveying capacity of conveying screw feeding device 118.
At this, about the fed distance of particulate powder and the relation of its pulverization rate of the situation of the method for operation and conveying granular powder that change screw feeding device, be described with reference to Fig. 7.
Fig. 7 be represent about conveying granular powder continuously continuous operation mode and very short time intermediate gap property 2 operation modes of intermittent running pattern of carrying carry out the result investigated.Further, the rotating speed of the screw rod of the screw feeding device of each operation mode of investigation is 90rpm(rev/min) and 400rpm these 2.
In addition, the pulverization rate of the particulate powder shown in Fig. 7 be by conveying after the particulate powder sieve of the more tiny mesh of average grain diameter possessing the particulate powder before than conveying, particulate powder under measurement sieve (namely, the particulate powder of efflorescence) weight, by this measured value divided by conveying whole particulate powder weight and try to achieve.At this, the average grain diameter of the particulate powder before conveying is about 300 μm, so, use the sieve of less than 70% (at this, being 210 μm) of the average grain diameter that the size of mesh is particulate powder.
As shown in Figure 7, continuously when running screw feeding device, the pulverization rate of particulate powder along with the fed distance of particulate powder elongated, there is the tendency increased lentamente.In addition, by changing the rotating speed of screw rod, how many pulverization rates also can change, but will suppress to implement below the 10 quality % of stable casting.
On the other hand, when intermittent running screw feeding device, the pulverization rate of particulate powder along with the fed distance of particulate powder elongated, there is the tendency sharply increased.Further, the rotating speed by accelerating screw rod, the rate of climb of pulverization rate is also entered one and is risen sharp.
From above situation, in very short time when intermittent running screw feeding device, the pulverization rate of particulate powder rises, and may not implement stable casting.
Therefore, make the fed distance transporting use screw feeding device 116 shorter than the fed distance (the total fed distance of each screw feeding device 112,114) of conveying screw feeding device 118.
Further, in order to implement stable casting, preferably the pulverization rate of the particulate powder be supplied in casting mold 12 is reduced to below 15 quality %.
For this reason, according to Fig. 7, transporting of the pulverization rate maximally affecting particulate powder is preferably made to be set to below 7m by the fed distance of screw feeding device 116, but, if also consider other the pulverization rate caused because of conveying screw feeding device 118, then preferably make to transport the fed distance shorter (below 5m) with screw feeding device 116.Further, shorten by the length of screw feeding device 116 with transporting, the pulverization rate of particulate powder also reduces sharp, so do not specify about its lower limit, but, if consider the guaranteeing of working space, then can use 2m(and then 3m) and left and right is as shortest length.
Embodiment
Then, the embodiment of carrying out for the action effect in order to confirm present embodiment is described.
First, Fig. 8 represents the method for operation of each screw feeding device 112,114 of the conveying screw feeding device 118 shown in pie graph 5 and transports the method for operation using screw feeding device 116.
At this, with the total fed distance from each screw feeding device 112,114 of configuration storage hopper 111 to transfer hopper 115 for 6m, to use the fed distance of screw feeding device 116 for 4m from transfer hopper 115 to dropping into transporting of configuration hopper 120.Consequently, transport and become shorter than the fed distance of conveying screw feeding device 118 by the fed distance of screw feeding device 116.
Further, make from storage hopper 111 to transfer hopper 115 conveying screw feeding device 118 operate as low operation (that is, playing a role as low operation feed appliance).Specifically, will screw rod be carried out at interval of 25 minutes with the rotation speed operation continuous running of 3 minutes of 400rpm.The conveying capacity of particulate powder was at this moment 20kg when 3 minutes.
On the other hand, make to run (that is, making it to run feed appliance as height and play a role) for high with screw feeding device 116 from transfer hopper 115 to dropping into transporting of hopper 120.Specifically, will screw rod be carried out off and on the interval of the rotating speed of the 90rpm rotation continuous running of 30 ~ 40 seconds by 30 ~ 40 seconds.The conveying capacity of particulate powder is at this moment every 1 about 1kg.
Fig. 9 represents its result.In addition, Fig. 9 represents and does not arrange transfer hopper 115, configuration 1 screw feeding device (fed distance 10m) from storage hopper 111 to input hopper 120, and will screw rod be made to rotate the result of the comparative example that the short-time running between 30 ~ 40 seconds is carried out off and on by the interval of 30 ~ 40 seconds with the rotating speed of 90rpm.
About pulverization rate here, because the average grain diameter of the particulate powder before conveying is about 300 μm, so the sieve that the size of use mesh is 210 μm is obtained.
As can be seen from Figure 9, by arranging transfer hopper 115, change the conveying screw feeding device 118 of side configuration at its upstream and the method for operation transported with screw feeding device 116 of downstream configuration, the pulverization rate of particulate powder can be suppressed at below the 15 quality % as desired value.Further, in a comparative example, pulverization rate rises to about 30 quality %.
Can confirm that from above result continuous casing according to the present embodiment can suppress the efflorescence of particulate powder.
Accordingly, due to can the melting speed of stable particle sprills in casting mold 12, uniform melting layer can be formed at liquid steel level 13 and between the internal face making it inflow casting mold 12 and solidified shell, stably promote the generation of solidified shell, therefore stably can implement casting.So the efflorescence can seeking particulate powder prevents and the taking into account of stable supplying, and can implement stable casting.Consequently, the product quality of strand can be improved.
Above, describe the embodiments of the present invention, but the present invention is not just defined in the formation that the respective embodiments described above are recorded, and comprises other embodiment and variation yet.Such as, combine part or all of the respective embodiments described above and variation and form situation of the present invention and be also contained in interest field of the present invention.
In above-mentioned 2nd embodiment, situation for the conveying screw feeding device 118 being formed in configuration between storage hopper 111 and transfer hopper 115 with 2 screw feeding devices 112,114 of arranged in series is illustrated, but be not only limited to this formation, can form with more than 3 of arranged in series (in reality being less than 10) screw feeding device yet.Now, preferably arrange between adjacent screw feeding device and connect the end of downstream side of each screw feeding device and the connection hopper of upstream-side-end.
Utilizability in industry
According to the present invention, the flux feeding device of the product quality that can improve strand, continuous casting equipment, flux input method and continuous casing can be provided.
Symbol description:
10 powder 11 supply pipe 12 casting mold 13 liquid steel level 14 tundish supports 15 are stored hopper 16 down-comer 17 transfer tube 18 powder and are dropped into hopper 19 tundish 20 and flood the continuous casting of ozzle 21 ~ 24 straight tube 110 and store hopper 112 screw feeding device 113 with the conveying equipment 111 of mould powder and connect hopper 114 screw feeding device 115 transfer hopper 116 and transport with screw feeding device that ((conveying conveying worm 120 drops into hopper 121 and drops into chute (supply pipe) to transport use conveying worm 117 whirligig (flux feeding device) 118,119 conveying screw feeding device
Claims (10)
1. a flux feeding device, it possesses: the input hopper temporarily storing flux to be connected with this input hopper with rear end and top is positioned at the inclined supply pipe of mode above casting mold, it is characterized in that,
Height dimension H from the liquid steel level in above-mentioned casting mold to above-mentioned input hopper is more than 0.5m and below 3.0m,
Above-mentioned supply pipe is more than 20 degree relative to the minimum cant α of horizontal direction,
The imaginary line be connected with the lower position on the above-mentioned top of above-mentioned supply pipe by the outlet of the above-mentioned flux of above-mentioned input hopper is 54.6 × H relative to the angle θ that above-mentioned horizontal direction is formed
-0.5below degree.
2. flux feeding device according to claim 1, is characterized in that,
Above-mentioned supply pipe has the multiple straight tubes be connected to each other,
In these straight tubes, the angle of inclination of the straight tube minimum relative to the angle of inclination of above-mentioned horizontal direction is above-mentioned minimum cant α.
3. flux feeding device according to claim 1, is characterized in that,
The above-mentioned top of above-mentioned supply pipe is configured in following ranges in the position of above-mentioned horizontal direction: with the internal face position of the above-mentioned casting mold of position immediately below this supply pipe for benchmark, from towards the position of square 50mm in above-mentioned casting mold to the scope of the position of the foreign side 200mm towards this casting mold.
4. flux feeding device according to claim 1, is characterized in that,
This device also possesses gas supply means, and described gas supply means is relative to the every 1cm in this supply pipe
2flow path cross sectional area is with more than 0 and be that the flow of less than 3 liters/min is blown into gas in above-mentioned supply pipe.
5. a continuous casting equipment, is characterized in that, possesses the flux feeding device according to any one of Claims 1 to 4 and described casting mold.
6. continuous casting equipment according to claim 5, is characterized in that,
The strand casting speed of above-mentioned casting mold is more than 0.6m/ minute.
7. a flux input method, it makes flux fall by inclined supply pipe and is supplied to the liquid steel level in casting mold, it is characterized in that,
From above-mentioned liquid steel level to above-mentioned flux, the height dimension H of lowering position is more than 0.5m and below 3.0m,
Above-mentioned supply pipe is more than 20 degree relative to the minimum cant α of horizontal direction,
Be 54.6 × H by the imaginary line be connected between above-mentioned beginning lowering position and the position of the bottom, top of above-mentioned supply pipe relative to the angle θ that above-mentioned horizontal direction is formed
-0.5below degree.
8. flux input method according to claim 7, is characterized in that, the method also possesses relative to the every 1cm in above-mentioned supply pipe
2flow path cross sectional area is with more than 0 and be the operation that the flow of less than 3 liters/min is blown into gas in above-mentioned supply pipe.
9. a continuous casing, is characterized in that, comprises the operation using the above-mentioned liquid steel level in the above-mentioned casting mold of flux input side normal direction described in claim 7 or 8 to supply above-mentioned flux.
10. continuous casing according to claim 9, is characterized in that, the strand casting speed of above-mentioned casting mold is more than 0.6m/ minute.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2010/003396 WO2011145145A1 (en) | 2010-05-20 | 2010-05-20 | Flux loading device, continuous casting device, flux loading method, and continuous casting method |
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| Publication Number | Publication Date |
|---|---|
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| CN102883837B true CN102883837B (en) | 2015-03-18 |
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| JP (1) | JP4920801B2 (en) |
| CN (1) | CN102883837B (en) |
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| JP5847686B2 (en) * | 2012-10-25 | 2016-01-27 | 株式会社神戸製鋼所 | Method of adding mold flux into continuous casting mold |
| CN105057615B (en) * | 2015-07-30 | 2017-04-12 | 江苏永钢集团有限公司 | Crystallizer mold flux adding device |
| GB201517130D0 (en) * | 2015-09-28 | 2015-11-11 | Imerys S A | A flux feeding apparatus and method |
| CN106424680A (en) * | 2016-08-30 | 2017-02-22 | 湖北立晋钢铁集团有限公司 | Square billet steel pouring operation technological process |
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- 2010-05-20 BR BR112012029141-6A patent/BR112012029141A2/en not_active Application Discontinuation
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| Publication number | Publication date |
|---|---|
| JP4920801B2 (en) | 2012-04-18 |
| CN102883837A (en) | 2013-01-16 |
| BR112012029141A2 (en) | 2021-08-03 |
| WO2011145145A1 (en) | 2011-11-24 |
| JPWO2011145145A1 (en) | 2013-07-22 |
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