CN117531990A - Tool and method for replacing tundish of continuous casting machine - Google Patents
Tool and method for replacing tundish of continuous casting machine Download PDFInfo
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- CN117531990A CN117531990A CN202311526304.7A CN202311526304A CN117531990A CN 117531990 A CN117531990 A CN 117531990A CN 202311526304 A CN202311526304 A CN 202311526304A CN 117531990 A CN117531990 A CN 117531990A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005266 casting Methods 0.000 claims abstract description 98
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 58
- 239000010959 steel Substances 0.000 claims abstract description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 238000005520 cutting process Methods 0.000 claims abstract description 27
- 239000000498 cooling water Substances 0.000 claims abstract description 12
- 238000004513 sizing Methods 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 244000137852 Petrea volubilis Species 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 3
- 238000005304 joining Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000011819 refractory material Substances 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 210000001161 mammalian embryo Anatomy 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
-
- 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
- B22D11/08—Accessories for starting the casting procedure
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/163—Controlling or regulating processes or operations for cutting cast stock
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a tool and a method for replacing a tundish of a continuous casting machine, which relate to the technical field of steel smelting and comprise a casting blank sizing measuring tool capable of determining the length of a tail blank, a connecting rod capable of connecting old tundish molten steel and new tundish casting molten steel, a cold strip rack capable of placing cold strips and a drainage Sha Zhitong capable of draining the new tundish, and further comprise the following steps: fine-tuning water quantity, blocking flow of an old tundish, closing secondary cooling water, inserting a connecting rod, adding a cooling strip, replacing the tundish, centering a water gap, blocking the water gap, pouring and draining, starting to pull out and cutting a joint. The invention greatly shortens the replacing time of the tundish, improves the production continuity, improves the product yield, reduces the labor intensity, reduces the consumption of refractory materials, reduces the probability of steel leakage accidents, reduces the energy consumption and reduces the cost of auxiliary materials.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a tool and a method for replacing a tundish of a continuous casting machine.
Background
The general continuous casting machine consists of a molten steel carrying device (a ladle and a rotary table), a tundish, a replacing device, a crystallizer, a secondary cooling zone, a withdrawal and straightening machine, a cutting device and a dummy ingot device. The tundish plays a role in buffering and purifying molten steel, the capacity is generally 20-40% of the capacity of the ladle, and the larger the number of casting flows is, the larger the capacity is. The crystallizer is the heart of the continuous casting machine, and is required to have the characteristics of good heat conductivity, structural rigidity, wear resistance, convenience in manufacturing and maintenance and the like, and is generally made of forged red copper or cast brass, and the outer wall of the crystallizer is forced to be uniformly cooled by water. The second cooling zone is closely connected with the outlet of the crystallizer and has the functions of accelerating casting blank solidification and controlling the temperature of the casting blank by means of water spraying or atomization cooling, and the clamping roller and the guide roller in the second cooling zone support the high-temperature casting blank with the liquid core so as to prevent bulging deformation or internal cracking. The withdrawal and straightening machine has the functions of providing withdrawal power and straightening a bent casting blank, pushing the cutting device to move, and greatly influencing the continuous casting yield and quality of the withdrawal speed. The dummy bar consists of a dummy bar head, a transition piece and a bar body, before casting, the dummy bar head and part of the transition piece enter a crystallizer to form a movable 'inner bottom' of the crystallizer, molten steel is solidified after casting is started, the molten steel is solidified with the dummy bar head, the dummy bar is pulled by a withdrawal and straightening machine, a casting blank is continuously pulled out of the crystallizer until the dummy bar head is separated from the casting blank through the rear of the withdrawal and straightening machine, and the casting blank enters a dummy bar storage device. The cutting device cuts the casting blank in continuous motion into fixed dimensions.
The continuous casting production process flow is as follows: and (3) conveying the ladle filled with refined molten steel to a rotary table, pouring the molten steel into a tundish after the rotary table rotates to a pouring position, distributing the molten steel into each crystallizer by a water gap in the tundish, pulling out castings in the crystallizers by a withdrawal and straightening machine, and cutting the castings into slabs with a certain length after cooling.
At present, after the service life of a tundish of a continuous casting machine is up, a tail blank in the tundish is pulled down, and the operation is performed again according to a new tundish casting operation process, and the specific operation is as follows: the method comprises the steps of pouring box plugging, casting blank pulling out of a crystallizer, casting blank pulling out of a withdrawal and straightening machine, cutting and lifting tail blanks, feeding dummy bars, installing dummy bars, feeding the dummy bars into the crystallizer, placing cold bars, pouring the pouring box into the crystallizer, removing the ingot of the casting blank, cutting and lifting head blanks and the like, wherein the time for completely completing the operations is about 90 minutes, and the replacement time of the pouring box is long, so that the production continuity and the yield of products are seriously affected; at the same time, the repetitive work is more labor-intensive for workers.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a tool and a method for replacing a tundish of a continuous casting machine, which are used for solving the problems of long tundish replacement time, low production continuity and high labor intensity of workers.
The invention is realized by the following technical scheme:
a replacing tool for a tundish of a continuous casting machine comprises a casting blank sizing tool capable of determining the length of a tail blank, a connecting rod capable of connecting old tundish molten steel and new tundish casting molten steel, a cold strip rack capable of placing cold strips and a drainage sand paper tube capable of draining the new tundish.
A method of replacing a tundish of a continuous casting machine, comprising the steps of:
s1, fine adjustment of water quantity: after the steel ladle stops pouring, the secondary cooling water distribution coefficient is downwards regulated by 0.3, and as the pressure of the molten steel in the tundish 3 is gradually reduced after the steel ladle stops pouring, the temperature of the casting blank after heat exchange is ensured to be higher than the straightening temperature by reducing the cooling strength of the casting blank, and the quality of the casting blank is ensured;
s2, blocking flow of an old tundish: when the molten steel of the old tundish remains for 3.5-4t, determining the length of the tail blank according to the casting blank sizing measuring tool, simultaneously, plugging the old tundish and stopping casting blank pulling speed, and aiming at the tail blank, as the temperature of the tail blank gradually decreases and the length of the tail blank gradually contracts, the automatic cutting tail blank length can generate errors, and the automatic cutting tail blank cannot be used for measuring the tail blank length for accurate cutting;
s3, closing secondary cooling water: closing a secondary cooling water valve when the casting blank is at zero pulling speed, wherein secondary cooling water cannot be sprayed onto the casting blank in a static state in a secondary cooling zone, and otherwise, the casting blank is bent in the heat exchange process;
s4, inserting a connecting rod: vertically inserting a connecting rod into the molten steel of the crystallizer and solidifying, wherein the depth of the connecting rod inserted into the molten steel of the crystallizer is controlled to be 200-300mm, and the connecting rod ensures that the tail blank of the previous casting time is fully connected with the head blank of the next casting time;
s5, adding cold strips: the casting blank is pulled downwards by 200mm from the lower opening of the crystallizer by controlling the pulling speed, the cold strip on the cold strip frame is vertically placed in the crystallizer, the cold strip is placed on the cold strip frame in advance, so that the cold strip can be conveniently and quickly lifted and added into the crystallizer, the time is saved, and the cold strip is placed around the connecting rod to prevent molten steel in the next casting time from melting the connecting rod;
s6, replacing a tundish: after the cold strip is added, a person leaves the casting area, the old tundish car which is used for a period and blocked is driven away, and a baked standby new tundish car is driven to the upper part of the crystallizer;
s7, water gap centering: adjusting the new tundish to center the water gap with the center of the upper opening of the crystallizer;
s8, water gap blocking: an operator plugs the drainage Sha Zhitong from the lower part of the water gap of the new tundish, and then plugs the water gap of the new tundish by using a plugging cone to ensure smooth drainage;
s9, casting and drainage: after the ladle is started, when the liquid level of the new tundish is controlled to be 350mm, the plugging cone on the new tundish is removed, the new tundish is started, the casting sequence of the new tundish is that the flow rate of the middle is firstly carried out, then the flow rates of the two sides are carried out, and the liquid level of the new tundish is controlled to be 800-950mm when the new tundish is normally cast;
s10, starting and pulling speed: the water gap of the new tundish uses a water gap with the diameter of 16.5mm, the starting pulling speed is 1.2m/min, the normal pulling speed is 1.8-3.2m/min, and the excessively large water gap of the new tundish can cause the steel overflow accident due to the excessively fast pulling speed;
s11, cutting a joint: and cutting the casting blank joint by 500mm beyond the cutting device, lifting the joint out by using a crane, and normally cutting the casting blank according to the length of the automatically cut steel billet.
The invention uses the tail blank of the casting blank to replace the dummy bar to guide the steel blank, inserts the connecting rod into the non-solidified molten steel to replace the dummy bar, specifically, after continuous casting stops pouring, the tail blank is not pulled out of the crystallizer, cold bar solidification molten steel is added after the connecting rod is inserted, the new tundish casting liquid steel and the connecting rod cold bar are solidified together, and the casting blank is guided to enter the withdrawal and straightening machine instead of the continuous casting dummy bar system to finish casting operation.
Preferably, the casting blank sizing tool comprises a rod body and a carrying handle, wherein the handle is fixed on the rod body, and a plurality of billet size marks are arranged on the rod body. The detection switch is installed to the distance department of casting blank scale measuring tool from cutting device normal position, carries casting blank scale measuring tool to detection switch department through the transport handle, and when the casting blank head reached this position, detection switch sent signal, and cutting device cuts in step, and detection precision is higher to can detect multiple scale.
Preferably, the connecting rod comprises a rod body and two arc-shaped handles, wherein the two handles are symmetrically fixed at one end of the rod body, and an operator can conveniently insert the connecting rod into the crystallizer by holding the handles.
Preferably, the cold strip frame comprises a base, a plurality of connecting rods and two U-shaped frames, wherein the two U-shaped frames are respectively and parallelly fixed on the base through the connecting rods, the cold strip can be conveniently placed on the U-shaped frames in advance, and the cold strip can be conveniently and rapidly lifted to be added into the crystallizer, so that the time is saved.
Preferably, the drainage sand paper tube comprises a cylindrical tube body with an opening at the top end, drainage sand is filled in the tube body, drainage Sha Zhitong is filled in the tube body from the lower part of a new tundish nozzle, the new tundish nozzle is plugged by using a plugging cone, the new tundish nozzle can be tightly plugged, when the new tundish is poured, the plugging cone is taken out, and the drainage Sha Zhitong flows down along with molten steel from the new tundish nozzle, so that smooth drainage can be ensured.
Preferably, the method further comprises a standby new tundish baking step before the step S1: according to the service life of the old tundish used on line, the new tundish is baked 3.5 hours in advance, a working layer of the new tundish adopts dry materials, the new tundish is continuously baked for 3.5-4.5 hours according to the sequence of small fire, medium fire and big fire, and a water gap is cleaned frequently in the baking process of the new tundish, so that the water gap is kept smooth. The standby new tundish is baked in advance, firstly, the moisture of the refractory lining can be removed, the new tundish is prevented from turning over, and the safe production is ensured; secondly, the temperature of the refractory lining of the inner wall of the new tundish can be increased, and the temperature drop and heat loss of molten steel in the new tundish can be reduced; thirdly, the submerged air bubbles of the casting blank can be prevented, and the quality of the casting blank is improved.
Preferably, the method further comprises a molten steel joining step before step S8: after the last furnace steel is discharged from the converter, the next furnace molten steel is placed on a rotary table before the water gap of a new tundish is plugged, so that the time is saved.
The beneficial effects of the invention are as follows:
1. the tundish replacement time is short, and the production continuity is high: the tundish replacement method of the continuous casting machine solves the problem that the tundish is replaced after the service life of the tundish is up to the end, the original tundish replacement time is about 90 minutes, the existing tundish replacement time is not more than 15 minutes, the tundish replacement time is greatly reduced, and the production continuity is realized.
2. The yield of the product is improved: as the replacing time of the tundish is reduced, the yield can be increased by about 380 t/set.
3. Labor intensity is reduced: the method for replacing the tundish of the continuous casting machine solves the operation links of pulling down the tail billet and then casting after the service life of the tundish is up, saves the procedures of pulling out the casting blank from a crystallizer, pulling out the casting blank from a straightening machine, cutting and lifting the tail billet, feeding a dummy bar, installing a dummy bar, feeding the dummy bar into the crystallizer, removing the casting blank from the ingot and the like, and greatly reduces the labor intensity of workers.
4. Reducing the consumption of refractory materials: the continuous production of the converter reduces the falling of the heat vibration resistant materials of the converter and the ladle and reduces the consumption of the resistant materials.
5. The probability of steel leakage accidents in production is reduced: the tundish replacement method of the continuous casting machine reduces the times of pulling down and casting, reduces the abrasion of the copper pipe caused by casting, improves the steel passing amount of the copper pipe of the crystallizer, and reduces the probability of steel leakage accidents in production.
6. The energy consumption is reduced: the baking of the online ladle during the tundish replacement is reduced, and the gas consumption is reduced.
7. Reducing the cost of auxiliary materials: the dummy ingot bar is not used for traction, so that the consumption of the dummy ingot bar is reduced, and the expense for producing auxiliary materials is reduced.
Drawings
FIG. 1 is a process flow diagram of a method for replacing a tundish of a continuous casting machine according to the present invention;
FIG. 2 is a block diagram of a casting blank sizing tool in a method for replacing a tundish of a continuous casting machine according to the present invention;
FIG. 3 is a block diagram of a connecting rod in a method for replacing a tundish of a continuous casting machine according to the present invention;
FIG. 4 is a block diagram of a cold bar frame in a method of replacing a tundish of a continuous casting machine according to the present invention;
fig. 5 is a longitudinal sectional view of a new tundish stopper in a method of replacing a tundish of a continuous casting machine according to the present invention.
In the figure: 1. a ladle; 2. a rotary table; 3. a tundish; 4. a crystallizer; 5. a secondary cooling zone; 6. a withdrawal and straightening machine; 7. a cutting device; 8. a rod body; 9. carrying handles; 10. marking the size of a billet; 11. a rod body; 12. an arc-shaped handle; 13. a base; 14. a connecting rod; 15. a U-shaped frame; 16. drainage Sha Zhitong; 17. and (5) plugging the hole cone.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-5, the present embodiment relates to a tool and a method for replacing a tundish 3 of a continuous casting machine, comprising the steps of:
baking a new tundish: according to the service life of the old tundish used on line, the new tundish is baked 3.5 hours in advance, a working layer of the new tundish adopts dry materials, the new tundish is continuously baked for 3.5-4.5 hours according to the sequence of small fire, medium fire and big fire, the baking temperature is higher than 800 ℃, and a water gap is cleaned frequently in the baking process of the new tundish, so that the water gap is kept smooth. The standby new tundish is baked in advance, firstly, the moisture of the refractory lining can be removed, the new tundish is prevented from turning over, and the safe production is ensured; secondly, the temperature of the refractory lining of the inner wall of the new tundish can be increased, and the temperature drop and heat loss of molten steel in the new tundish can be reduced; thirdly, the submerged air bubbles of the casting blank can be prevented, and the quality of the casting blank is improved.
Fine tuning the water quantity: after the ladle 1 stops pouring, the water distribution coefficient of secondary cooling water is downwards regulated to 0.3 from 1.3 to 1.0, in the continuous casting steelmaking process, the casting blank is forcedly and uniformly cooled in the length interval from the outlet of the crystallizer 4 to the withdrawal and straightening machine 6, the interval is called a secondary cooling zone 5, a water spraying system and a series of roller clamping devices arranged according to an arc line are arranged in the interval, as the pressure of molten steel in the old tundish after the ladle 1 stops pouring is gradually reduced, the downflow speed of the molten steel is gradually slowed down, the straightening temperature of the withdrawal and straightening machine 6 is required to be more than 800 ℃, and the temperature after heat exchange of the casting blank can be ensured to be higher than the straightening temperature by reducing the cooling strength of the casting blank, thereby ensuring the quality of the casting blank.
Old tundish blocking flow: when the molten steel of the old tundish remains for 3.5-4t, determining the length of the tail blank according to the casting blank sizing measuring tool, simultaneously, blocking the old tundish and stopping casting blank pulling speed, and the old tundish cannot be emptied or slagged, so that casting slag is avoided, the quality of the casting blank is affected by slag inclusion, aiming at the tail blank, the tail blank is gradually reduced in temperature, the length of the tail blank is gradually contracted, the length of the tail blank automatically cut by the cutting device 7 can generate errors, and the tail blank length can not be accurately cut by using the automatically cut tail blank; the length of the casting blank sizing tool is 12 meters, the casting blank sizing tool comprises a rod body 8 and a carrying handle 9, the carrying handle 9 is fixed on the rod body 8, and a plurality of billet size marks 10 are arranged on the rod body 8. The detection switch is installed to the distance department of casting blank scale measuring tool from cutting device 7 normal position, carries casting blank scale measuring tool to detection switch department through transport handle 9, when the casting blank head reached this position, detection switch sent signal, and cutting device 7 cuts in step, and detection precision is higher to can detect multiple scale.
Closing secondary cooling water: when the casting blank is reset to zero, the secondary cooling water valve is closed, and when the casting blank is in a static state in the secondary cooling zone 5, secondary cooling water cannot be sprayed onto the casting blank, and otherwise, the casting blank is bent in the heat exchange process.
Inserting a connecting rod: vertically inserting a connecting rod into molten steel in the crystallizer 4 and solidifying, wherein the depth of the connecting rod inserted into the molten steel in the crystallizer 4 is controlled to be 200-300mm, and the tail blank of the previous casting time is fully connected with the head blank of the next casting time through the connecting rod; the connecting rod comprises a rod body 11 and two arc-shaped handles 12, wherein the rod body 11 is made of threaded steel with the diameter of 32mm, the length of the rod body is 600mm, the two arc-shaped handles 12 are symmetrically fixed at one end of the rod body 11, and an operator can hold the arc-shaped handles 12 to conveniently insert the connecting rod into the crystallizer 4.
Adding cold bars: the casting blank is pulled downwards by 200mm from the lower opening of the crystallizer 4 by controlling the pulling speed, the cold strip on the cold strip frame is vertically placed in the crystallizer 4, the cold strip is placed on the cold strip frame in advance, so that the cold strip can be conveniently and quickly picked up and added into the crystallizer 4, the time is saved, and the cold strip is placed around the connecting rod to prevent molten steel in the next casting time from melting the connecting rod; the cold strip frame comprises a base 13, a plurality of connecting rods 14 and two U-shaped frames 15, the two U-shaped frames 15 are respectively and parallelly fixed on the base 13 through the connecting rods 14, cold strips can be conveniently placed on the U-shaped frames 15 in advance, the cold strips can be conveniently and rapidly picked up, and the cold strips are added into the crystallizer 4, so that the time is saved.
And replacing the tundish 3: after the cold strip is added, the personnel leave the casting area, the old tundish car which is used for a period and blocked is driven away, and the baked standby new tundish car is driven to the upper part of the crystallizer 4.
Water gap centering: the new tundish is adjusted to enable the water gap to be centered with the center of the upper opening of the crystallizer 4, the deviation is less than 10mm, the left and right directions of the water gap are adjusted by adjusting the traveling direction of the new tundish, the front and rear directions of the water gap are adjusted by hydraulically pushing the new tundish, the focus of casting position is to confirm and finely adjust, and the water gap centering can directly influence the quality defects of casting blanks such as casting blank steel leakage, square dislocation, corner cracks and the like.
And (3) joining molten steel: after the last furnace steel is discharged from the converter, the next furnace molten steel is placed on the rotary table 2 before the water gap of the new tundish is plugged, so that the time is saved.
And (3) plugging a water gap: the operator plugs the drainage sand paper tube 16 from the lower part of the water gap of the new tundish, and then plugs the water gap of the new tundish by using the plugging cone 17, so that smooth drainage is ensured; the drainage sand paper tube 16 comprises a cylindrical tube body with an opening at the top end, the diameter of the tube body is 15-17mm, the length of the tube body is 200mm, drainage sand is filled in the tube body, the drainage sand paper tube 16 is plugged from the lower part of a new tundish nozzle, the new tundish nozzle is plugged by using the plugging cone 17, the new tundish nozzle can be tightly plugged, when the new tundish is poured, the plugging cone 17 is taken out, and the drainage sand paper tube 16 flows down along with molten steel from the new tundish nozzle, so that smooth drainage can be ensured.
Pouring and drainage: after the ladle 1 is started, when the liquid level of the new tundish is controlled to be 350mm, the hole blocking cone 17 on the new tundish is removed, the new tundish is started, the casting sequence of the new tundish is that the flow is firstly the middle flow and then the flow is the two sides, and the liquid level is controlled to be 800-950mm when the new tundish is normally cast.
Starting and pulling speed: the water gap of the new tundish uses a water gap with the diameter of 16.5mm, the starting pulling speed is 1.2m/min, the normal pulling speed is 1.8-3.2m/min, and the excessive large water gap of the new tundish can cause the steel overflow accident.
Cutting a joint: the length that the casting blank joint exceeded cutting device 7 is 500mm department and cuts, hangs out the joint with the driving, and the casting blank normally cuts according to automatic cutout's embryo length, and casting blank connects the sediment more, and the casting blank quality is poor, need cut.
It will be apparent that the embodiments described above are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a change instrument of package in middle of conticaster, its characterized in that includes the casting blank scale measuring tool that can confirm tail blank length, can connect old middle package molten steel and new middle package and open the connective bar of watering molten steel, can place the cold strip frame of cold strip and can drain the drainage sand paper section of thick bamboo of new middle package drainage.
2. The tool for replacing tundish of a continuous casting machine according to claim 1, wherein the casting blank sizing tool comprises a rod body and a carrying handle, the carrying handle is fixed on the rod body, and a plurality of billet size marks are arranged on the rod body.
3. The tool for replacing a tundish of a continuous casting machine according to claim 1, wherein: the connecting rod comprises a rod body and two arc-shaped handles, and the two arc-shaped handles are symmetrically fixed at one end of the rod body.
4. The tool for replacing a tundish of a continuous casting machine according to claim 1, wherein: the cold strip frame comprises a base, a plurality of connecting rods and two U-shaped frames, wherein the two U-shaped frames are respectively and parallelly fixed on the base through the connecting rods.
5. The tool for replacing a tundish of a continuous casting machine according to claim 1, wherein: the drainage sand paper tube comprises a cylindrical tube body with an opening at the top end, and drainage sand is filled in the tube body.
6. Method for changing a tundish with a changing tool of a tundish of a continuous casting machine according to claims 1-5, characterized by the steps of:
s1, fine adjustment of water quantity: after the ladle stops pouring, the secondary cooling water distribution coefficient is adjusted down by 0.3;
s2, blocking flow of an old tundish: when the molten steel of the old tundish remains for 3.5-4t, determining the length of the tail blank according to the casting blank sizing measuring tool, simultaneously plugging the old tundish and stopping casting blank pulling speed;
s3, closing secondary cooling water: closing a secondary cooling water valve when the casting blank pulling speed is reset to zero;
s4, inserting a connecting rod: vertically inserting a connecting rod into the molten steel of the crystallizer and solidifying, wherein the depth of the connecting rod inserted into the molten steel of the crystallizer is controlled to be 200-300mm;
s5, adding cold strips: the casting blank is pulled downwards by 200mm from the lower opening of the crystallizer by controlling the pulling speed, and the cold strip on the cold strip frame is vertically placed in the crystallizer;
s6, replacing a tundish: after the cold strip is added, a person leaves the casting area, the old tundish car which is used for a period and blocked is driven away, and a baked standby new tundish car is driven to the upper part of the crystallizer;
s7, water gap centering: adjusting the new tundish to center the water gap with the center of the upper opening of the crystallizer;
s8, water gap blocking: an operator plugs in drainage Sha Zhitong from the lower part of the water gap of the new tundish, and then plugs the water gap of the new tundish by using a plugging cone;
s9, casting and drainage: after the ladle is started, when the liquid level of the new tundish is controlled to be 350mm, the plugging cone on the new tundish is removed, the new tundish is started, the casting sequence of the new tundish is that the flow rate of the middle is firstly carried out, then the flow rates of the two sides are carried out, and the liquid level of the new tundish is controlled to be 800-950mm when the new tundish is normally cast;
s10, starting and pulling speed: the water gap of the new tundish uses a water gap with the diameter of 16.5mm, the starting pulling speed is 1.2m/min, and the normal pulling speed is 1.8-3.2m/min;
s11, cutting a joint: and cutting the casting blank joint by 500mm beyond the cutting device, lifting the joint out by using a crane, and normally cutting the casting blank according to the length of the automatically cut steel billet.
7. The method for replacing a tundish for a continuous casting machine according to claim 6, characterized in that: further comprising a standby new tundish baking step prior to step S1: according to the service life of the old tundish used on line, the new tundish is baked 3.5 hours in advance, a working layer of the new tundish adopts dry materials, the new tundish is continuously baked for 3.5-4.5 hours according to the sequence of small fire, medium fire and big fire, and a water gap is cleaned frequently in the baking process of the new tundish, so that the water gap is kept smooth.
8. The method for replacing a tundish for a continuous casting machine according to claim 7, characterized in that: further comprising a molten steel joining step prior to step S8: after the last furnace steel is discharged from the converter, the next furnace molten steel is placed on a rotary table before the water gap of a new tundish is plugged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311526304.7A CN117531990A (en) | 2023-11-16 | 2023-11-16 | Tool and method for replacing tundish of continuous casting machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311526304.7A CN117531990A (en) | 2023-11-16 | 2023-11-16 | Tool and method for replacing tundish of continuous casting machine |
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| Publication Number | Publication Date |
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| CN117531990A true CN117531990A (en) | 2024-02-09 |
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| CN202311526304.7A Pending CN117531990A (en) | 2023-11-16 | 2023-11-16 | Tool and method for replacing tundish of continuous casting machine |
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| Country | Link |
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| CN (1) | CN117531990A (en) |
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