CN117505829A - Protective casting device and protective casting method for continuous casting - Google Patents
Protective casting device and protective casting method for continuous casting Download PDFInfo
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- CN117505829A CN117505829A CN202311424386.4A CN202311424386A CN117505829A CN 117505829 A CN117505829 A CN 117505829A CN 202311424386 A CN202311424386 A CN 202311424386A CN 117505829 A CN117505829 A CN 117505829A
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- water gap
- box body
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- body structure
- plate
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- 238000005266 casting Methods 0.000 title claims abstract description 90
- 230000001681 protective effect Effects 0.000 title claims abstract description 79
- 238000009749 continuous casting Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 150
- 210000001503 joint Anatomy 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 20
- 238000003860 storage Methods 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 32
- 230000024121 nodulation Effects 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B22D41/52—Manufacturing or repairing thereof
-
- 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
- B22D41/58—Pouring-nozzles with gas injecting means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a protective casting device and a protective casting method for continuous casting, comprising a box body structure with an open top, a water gap quick-changing device and a protective gas supply device; a bottom plate of the box body structure is provided with a submerged nozzle through hole, and a side wall of the box body structure is provided with a first side opening; a first push-pull plate and a second push-pull plate are respectively arranged in two opposite directions of the first side opening; when the first push-pull plate and the second push-pull plate are pushed and pulled in opposite directions to the butt joint position, the first half hole and the second half hole are in butt joint to form a power element through hole; a second side opening corresponding to the first side opening is formed in the side wall of the box body structure, and a baffle is slidably arranged at the second side opening. The invention can solve the problem that the prior art lacks an effective method for casting and protecting the water gap contact surface of the three-section water gap on the premise of not influencing continuous casting production.
Description
Technical Field
The invention relates to the technical field of continuous casting production, in particular to a protection casting device for continuous casting and a protection casting method.
Background
The demand for producing high-quality carbon steel, welding wire steel, bearing steel, stainless steel, IF steel and the like is increasing, and the purity of these kinds of steel is very high during smelting. Therefore, when the continuous casting is used for producing the steel of the variety, the molten steel from a ladle to a crystallizer is required to be cast in a protecting way to prevent the molten steel from being oxidized due to contact with air, and particularly, the casting of low-carbon aluminum-containing steel is required to prevent nozzle nodulation.
In the production of billets and small-section slabs, a section of quick-change water gap is usually connected between a water gap of a tundish and a submerged nozzle, so that the water gap of the tundish and the submerged nozzle inserted into a crystallizer are formed into a three-section water gap, and the three-section water gap increases the contact surface between each water gap, such as the contact surface between the quick-change water gap and the water gap of the tundish, the contact surface between the quick-change water gap and each submerged nozzle, and the like, however, the contact surface between the water gaps is more likely to generate secondary oxidation pollution of molten steel and nodulation at the water gap caused by air suction, and finally the problems of steel product quality degradation or scrapping and the like are caused.
At present, in order to avoid secondary oxidation pollution of molten steel and nodulation at a water gap caused by air suction at the contact surface between a water gap of a tundish and a submerged nozzle, a cylindrical or box-shaped sealing device is generally arranged at the water gap contact surface in a casting mode of a two-section water gap, inert gas is introduced into the sealing device to protect the water gap contact position during casting, but casting time is limited by the service life of the water gap and still the capability of long-time casting is not provided. The existing three-section water gap capable of being cast for a long time has the problems of multiple sealing surfaces, midway need of disassembly and assembly of the water gap and the like, and is not suitable for protection casting of variety steel and aluminum-containing steel.
Therefore, an effective method for casting and protecting the nozzle contact surface of the three-section nozzle on the premise of not influencing continuous casting production is urgently needed at present.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a protection casting device and a protection casting method for continuous casting, so as to solve the problem that in the prior art, an effective method for casting and protecting a nozzle contact surface of a three-section nozzle is lacking under the premise of not influencing continuous casting production.
The invention provides a protective casting device for continuous casting, comprising: the top is an open box structure, a water gap quick-changing device and a protective gas supply device; wherein, the opening of the box body structure is fixedly arranged on the bottom surface of the bottom plate of the middle tank; a bottom plate of the box body structure is provided with a submerged nozzle through hole, and a side wall of the box body structure is provided with a first side opening; a first push-pull plate and a second push-pull plate are respectively arranged in two opposite directions of the first side opening; a first half hole and a second half hole are respectively arranged at the butted end parts of the first push-pull plate and the second push-pull plate, and when the first push-pull plate and the second push-pull plate are pushed and pulled oppositely to the butted position, the first half hole and the second half hole are butted to form a power element through hole; a second side opening corresponding to the first side opening is formed in the side wall of the box body structure, and a baffle is slidably arranged at the second side opening; the water gap quick-changing device comprises a water gap sliding block arranged in the box body structure, a blind plate block arranged on one side of the water gap sliding block and a power element connected with the outer side wall of the blind plate block; a water gap communicating opening is arranged in the water gap sliding block, the upper end of the water gap communicating opening is in butt joint with the water gap of the intermediate tank, and the lower end of the water gap communicating opening is in butt joint with the upper end of a submerged water gap inserted into the box body structure through the submerged water gap through hole; the protective gas supply device comprises a first protective gas supply pipe, a second protective gas supply pipe and a protective gas storage device, wherein the first protective gas supply pipe and the second protective gas supply pipe are arranged on the side wall of the box body structure, the protective gas storage device is connected with the first protective gas supply pipe and the second protective gas supply pipe, and the gas outlet end of the first protective gas supply pipe is arranged at the joint of the water gap communication port and the water gap of the intermediate tank; the gas outlet end of the second protective gas supply pipe is arranged at the joint of the water gap communication port and the immersed water gap.
In addition, preferably, one end of the bottom plate of the box body structure is rotatably connected to the bottom of one side wall of the box body structure through a rotating shaft, bolts are arranged on two sides of the top of the bottom plate of the box body structure, and two sides of the bottom plate of the box body structure are fixed on two outer side walls of the box body structure through the bolts.
In addition, it is preferable that an upper guide plate and a lower guide plate are respectively arranged at the top and the bottom of the first side opening; an upper chute is formed in the bottom surface of the upper guide plate, a lower chute is formed in the top surface of the lower guide plate, and the upper ends of the first push-pull plate and the second push-pull plate are both arranged in the upper chute; the lower ends of the first push-pull plate and the second push-pull plate are arranged in the lower chute.
In addition, preferably, the length of the first push-pull plate is equal to the length of the second push-pull plate; and a power element through hole formed by butting a first half hole on the first push-pull plate with a second half hole on the second push-pull plate is positioned in the middle position of the first side opening.
In addition, preferably, an upper groove plate and a lower groove plate are respectively arranged above and below the second side opening on the outer side wall of the box body structure; the upper end and the lower end of the baffle are respectively arranged in the sliding grooves of the upper groove plate and the lower groove plate.
In addition, preferably, the power element is an oil cylinder; the shape of the power element through hole is the same as the section shape of the oil cylinder; the gap between the outer side wall of the oil cylinder and the inner side wall of the power element through hole is smaller than 2 mm.
In addition, preferably, the box body structure is made of metal.
Furthermore, it is preferable that the top of the box structure is welded to the bottom surface of the bottom plate of the tundish.
Furthermore, it is preferable that the submerged nozzle through hole is a circular hole.
The protection casting method provided by the invention adopts the protection casting device for continuous casting to carry out casting protection on the joint of the water gap of the tundish and the immersed water gap in the continuous casting process, and comprises the following steps:
s1, fixing the top opening of a box body structure without a bottom plate on the bottom surface of the bottom plate of a middle tank, and installing the water gap quick-change device into the box body structure through the bottom of the box body structure to obtain a protection casting structure;
s2, mounting a bottom plate of the box body structure to the bottom of the box body structure in the protection casting structure, and mounting the submerged nozzle to the inside of a through hole of the submerged nozzle to obtain a protection casting device to be regulated;
s3, adjusting positions of a first push-pull plate and a second push-pull plate on a first side opening of a box body structure in the to-be-adjusted protection casting device, enabling a first half hole on the first push-pull plate and a second half hole on the second push-pull plate to be in butt joint with each other from two opposite directions of a power element in the water gap quick-change device to form a power element through hole, and adjusting the baffle to the second side opening to enable the inside of the box body structure in the to-be-adjusted protection casting device to be in a closed state, so as to obtain the to-be-used protection casting device;
and S4, opening an air source supply switch of a protective air storage device which is pre-installed on a box body structure of the to-be-used protective casting device, filling protective air into a joint of the water gap communication port and the water gap of the tundish and a joint of the water gap communication port and the immersed water gap, and casting molten steel in the tundish into a crystallizer. The submerged nozzle and the nozzle slide block can be replaced according to actual needs in the casting process.
According to the technical scheme, the protective casting device and the protective casting method for continuous casting provided by the invention are characterized in that the side wall of the box body structure is provided with the first side opening and the second side opening, the first push-pull plate and the second push-pull plate are respectively arranged in two opposite directions of the first side opening, the baffle is arranged on the second side opening in a sliding way, the blind plate block is arranged on one side of the water gap sliding block, and the power element is connected with the outer side wall of the blind plate block, when the water gap sliding block is replaced, the power element is only required to be started, the power element pushes the blind plate sliding block to the position of the water gap sliding block to be replaced, so that the casting process of the intermediate tank can be suspended, then the first side opening is in an open state by adjusting the positions of the first push-pull plate and the second push-pull plate, the power element and the blind plate block are taken out from the second side opening, and the new water gap sliding block is rapidly placed on the working position, then the blind plate and the power element are placed again through the first side opening, the positions of the first push-pull plate and the second push-pull plate are adjusted, the first push-pull plate and the second push-pull plate are butted from two sides of the power element, the power element is positioned in a power element through hole formed by butting the first push-pull plate and the second push-pull plate, the position of the baffle is adjusted to the second side opening, the inside of the box body structure is in a closed state, an air source supply switch of a protective air supply device is started, the water gap butting position of the water gap communicating opening and the intermediate tank and the water gap butting position of the water gap communicating opening and the immersed water gap are filled with protective air, molten steel in the intermediate tank is cast into a crystallizer, the problems of secondary pollution of molten steel, water gap nodulation and the like caused by air suction at the water gap butting surface of the water gap communicating opening and the intermediate tank and the water gap butting position of the immersed water gap can be effectively solved, and when the water gap sliding block is replaced, the positions of the first push-pull plate and the second push-pull plate and the position of the baffle plate at the second side opening are adjusted only by the first side opening, and the whole protective casting device is not required to be removed, so that continuous production of continuous casting is ensured.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic structural view of a protective casting device for continuous casting according to an embodiment of the present invention;
FIG. 2 is a schematic view of a box structure according to an embodiment of the present invention;
fig. 3 is a flow chart of a method of protecting casting according to an embodiment of the present invention.
In the drawing, 1-box body structure, bottom plate of 11-box body structure, 111-immersed nozzle through hole, 112-rotating shaft, 113-bolt, 12-front plate, 121-first side opening, 1211-upper guide plate, 1212-lower guide plate, 13-back plate, 131-second side opening, 14-first side plate, 15-second side plate, 31-first push-pull plate, 311-first half hole, 32-second push-pull plate, 321-second half hole, 33-power element through hole, 4-baffle, 51-nozzle slide block, 511-nozzle communication opening, 52-blind plate, 53-power element, 61-nozzle of intermediate tank, 62-bottom plate of intermediate tank, 7-immersed nozzle, 8-first protective gas supply pipe.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
In the continuous casting process, a three-section type water gap is usually adopted, namely, a section of quick-change water gap is connected between the water gap of the intermediate tank and the immersed water gap inserted into the crystallizer, the three-section type water gap can be simultaneously connected with a plurality of immersed water gaps, so that the connection quantity of the immersed water gaps is increased, the continuous casting production efficiency is improved, but the contact surface between the quick-change water gap and the water gap of the intermediate tank, the contact surface between a plurality of water outlets at the lower part of the quick-change water gap and a plurality of immersed water gaps are increased, and the contact surface between the water gaps is easy to suck air to cause secondary oxidation pollution of molten steel and nodulation at the water gap, and finally the problems of degradation or scrapping of steel products are caused.
At present, in order to avoid secondary oxidation pollution of molten steel and nodulation problem at a water gap caused by air suction at a contact surface between a water gap of a tundish and a submerged nozzle, a cylindrical or box-shaped sealing device is arranged at the water gap contact surface, inert gas is introduced into the sealing device to protect the water gap contact position during casting, but the sealing device is directly fixed at the water gap contact surface, so that a quick water gap is inconvenient to replace for a three-section water gap, and if the sealing device needs to be wholly detached from the tundish or the water gap contact position, continuous casting production is affected. Therefore, in view of the above-mentioned problems in the prior art, the present invention provides a protection casting device and a protection casting method for continuous casting.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the protection casting device for continuous casting and the protection casting method provided by the invention, fig. 1 shows the structure of the protection casting device for continuous casting according to an embodiment of the invention; FIG. 2 shows the structure of a cartridge structure according to an embodiment of the present invention; fig. 3 shows a method flow of protecting casting according to an embodiment of the invention.
As shown in fig. 1 to 3, the protection casting device for continuous casting provided by the present invention includes: the top is provided with an open box body structure 1, a water gap quick-changing device and a protective gas supply device; wherein the opening of the box structure is fixedly arranged on the bottom surface of the bottom plate 62 of the intermediate tank; a submerged nozzle through hole 111 is arranged on the bottom plate 11 of the box body structure, and a first side opening 121 is arranged on the side wall of the box body structure 1; a first push-pull plate 31 and a second push-pull plate 32 are respectively arranged in two opposite directions of the first side opening 121; the butt joint ends of the first push-pull plate 31 and the second push-pull plate 32 are respectively provided with a first half hole 311 and a second half hole 321, and when the first push-pull plate 31 and the second push-pull plate 32 are pushed and pulled oppositely to the butt joint position, the first half hole 311 is in butt joint with the second half hole 321 to form a power element through hole 33; a second side opening 131 corresponding to the first side opening 121 is formed in the side wall of the box body structure, and a baffle 4 is slidably arranged at the second side opening 131; the water gap quick-changing device comprises a water gap sliding block 51 arranged in the box body structure 1, a blind plate block 52 arranged on one side of the water gap sliding block 51 and a power element 53 connected with the outer side wall of the blind plate block 52; a water gap communication port 511 is arranged in the water gap sliding block 51, the upper end of the water gap communication port 511 is in butt joint with the water gap 61 of the intermediate tank, and the lower end of the water gap communication port 511 is in butt joint with the upper end of the immersed water gap 7 inserted into the box body structure 1 through the immersed water gap through hole 111; the protective gas supply device comprises a first protective gas supply pipe 8, a second protective gas supply pipe and a protective gas storage device which are arranged on the side wall of the box body structure 1, wherein the protective gas storage device is connected with the first protective gas supply pipe and the second protective gas supply pipe, and the gas outlet end of the first protective gas supply pipe 8 is arranged at the butt joint position of a water gap communication port 511 and a water gap 61 of the intermediate tank; the air outlet end of the second protective gas supply pipe is arranged at the butt joint of the water gap communication port 511 and the immersed water gap 7.
The shape of the box body structure 1 in the present invention may be a cuboid, a cube or a cylinder with an open top, and the shape of the box body structure 1 is not particularly limited in the present invention. For better description of the case structure 1 in the present invention, the following description will be made with the case structure 1 having a rectangular parallelepiped shape as a specific example.
As shown in fig. 1, the box structure 1 includes a bottom plate 11, a front plate 12, a back plate 13, and first and second side plates 14 and 15. The first side plate 14 and the second side plate 15 are oppositely arranged, the back plate 13 is a fixed plate, two side ends of the back plate are fixedly connected with one ends of the first side plate 14 and the second side plate 15 respectively, and two side ends of the front plate 12 are fixedly connected with the other ends of the first side plate 14 and the second side plate 15 respectively. The first side port 121 is provided on the front plate 12, and the second side port 131 is provided on the back plate 13. The size of the first side opening 121 may be equal to that of the front plate 12, where the first push-pull plate 31 and the second push-pull plate 32 together form the front plate 12.
The shielding gas in the present invention is an inert gas such as helium, neon, argon, etc.
By providing the first side opening 121 and the second side opening 131 on the side wall of the box body structure 1, respectively providing the first push-pull plate 31 and the second push-pull plate 32 on the two opposite directions of the first side opening 121, slidably providing the baffle plate 4 on the second side opening 131, providing the blind plate 52 on one side of the nozzle slide block 51 and connecting the power element 53 on the outer side wall of the blind plate 52, when the nozzle slide block 51 is replaced, only the power element 53 needs to be started, so that the power element 53 pushes the blind plate 52 to the position of the nozzle slide block 51 to be replaced, thereby suspending the pouring process of the tundish, then, by adjusting the positions of the first push-pull plate 31 and the second push-pull plate 32, the first side opening 121 is opened, and the power element 53 and the blind plate 52 are taken out therefrom, and a new water gap slide block 51 is quickly placed on the working position from a second side opening 131, then a blind plate block 52 and a power element 53 are replaced through a first side opening 121, the positions of a first push-pull plate 31 and a second push-pull plate 32 are adjusted, the first push-pull plate 31 and the second push-pull plate 32 are butted from two sides of the power element 53, the power element 53 is positioned in a power element through hole 33 formed by butting the first push-pull plate 31 and the second push-pull plate 32, the position of a baffle plate 4 is adjusted to the position of the second side opening 131, the inside of the box body structure 1 is in a closed state, an air source supply switch of a protective air supply device is started, the butting position of a water gap communication opening 511 and a water gap 61 of a middle tank and the butting position of the water gap communication opening 511 and a immersed water gap 7 are filled with protective air, molten steel in the middle tank is cast into a crystallizer, the problems of secondary pollution of molten steel, nozzle nodulation and the like caused by air suction at the joint surface of the nozzle communication port 511 and the nozzle 61 of the tundish and the joint surface of the nozzle communication port 511 and the immersed nozzle 7 can be effectively solved, and the positions of the first push-pull plate 31 and the second push-pull plate 32 and the position of the baffle plate 4 at the second side port 131 are only required to be adjusted when the nozzle slide block 51 is replaced, so that the whole protective casting device is not required to be removed.
In a preferred embodiment of the present invention, one end of the bottom plate 11 of the box structure is rotatably connected to the bottom of one side wall of the box structure 1 through a rotation shaft 112, two sides of the top of the bottom plate 1 of the box structure are provided with bolts 113, and two sides of the bottom plate 1 of the box structure are fixed to two outer side walls of the box structure 1 through bolts 113. The bottom plate 11 of the box body structure can rotate at least 90 degrees around the rotating shaft 112 through the connection with the bottom of one side wall of the box body structure 1, and the water gap quick-change device is convenient to install inside the box body structure 1 through the bolts 113 and the two outer side walls fixed on the box body structure 1. Taking a cuboid box body structure as an example, a bottom plate 11 of the box body structure can be rotatably connected to the bottom of the back plate 13 through a rotating shaft 112, two sides of the bottom plate 11 are respectively provided with a bolt 113, and two sides of the bottom plate 11 are respectively fixed on the outer side surfaces of the first side plate 14 and the second side plate 15 through the bolts 113. Wherein, the bolt includes the vertical inserted block that sets up on the bottom plate and sets up two bolt fixed lugs on box body structure 1's lateral wall, is provided with the bolt through-hole on the inserted block, and the inserted block is located between two bolt fixed lugs to the fixed orifices on bolt through-hole and the two bolt fixed lugs are located on a straight line, insert between the fixed orifices and the bolt through-hole of two bolt fixed lugs and establish the cylindricality cutting. Of course, the fixing manner of the base plate 1 and the case of the case structure of the present invention may be other manners, and is not particularly limited herein.
In a preferred embodiment of the present invention, upper and lower guide plates 1211 and 1212 are provided at the top and bottom of the first side port 121, respectively; an upper chute is arranged on the bottom surface of the upper guide plate 1211, a lower chute is arranged on the top surface of the lower guide plate 1212, and the upper ends of the first push-pull plate 31 and the second push-pull plate 32 are arranged inside the upper chute; the lower ends of the first push-pull plate 31 and the second push-pull plate 32 are arranged in the lower chute.
Through the structural design, the first push-pull plate 31 and the second push-pull plate 32 can slide along the upper chute and the lower chute in opposite or opposite directions, so that the closed state of the inside of the box body structure during casting can be ensured, and the power element 53 and the blind plate block 52 can be conveniently pulled out through the first side opening 121 and the power element 53 and the blind plate block 52 can be conveniently replaced after the new water gap sliding block 51 is replaced. When the first side opening 121 is the same size as the front plate 12, the top of the upper guide plate 1211 is fixed to the bottom surface of the bottom plate 62 of the tundish.
Of course, the first side opening 121 may be provided with a first side guide plate and a second side guide plate respectively on two vertically opposite sides, the first side guide plate and the second side guide plate are provided with a first side chute and a second side chute respectively, two ends of the first push-pull plate and the second push-pull plate are respectively arranged in the first side chute and the second side chute, and the first half hole and the second half hole are respectively arranged at the bottom end of the first push-pull plate and the top end of the second push-pull plate, so that the first push-pull plate and the second push-pull plate can both slide up and down, and the same technical effects as those of the above embodiments can be achieved.
In a preferred embodiment of the present invention, the length of the first push-pull plate 31 is equal to the length of the second push-pull plate 32; the power element through hole 33 formed by abutting the first half hole 311 on the first push-pull plate 31 and the second half hole 321 on the second push-pull plate 32 is located at the middle position of the first side opening 121. This structural design makes the overall structure more reasonable, and makes the power element through hole 33 be located in the intermediate position of first side port 121, i.e. the power element is also located in the intermediate position of first side port 121.
In a preferred embodiment of the present invention, an upper slot plate and a lower slot plate are respectively disposed above and below the second side opening 131 on the outer side wall of the box structure 1; the upper and lower ends of the baffle 4 are respectively arranged in the sliding grooves of the upper and lower groove plates. Wherein one end of the baffle 4 may also be hinged to one side of the second side port 131, thereby forming a door-type structure.
In a preferred embodiment of the present invention, the power element 53 is an oil cylinder; the shape of the power element through hole 33 is the same as the section shape of the oil cylinder; the gap between the outer sidewall of the cylinder and the inner sidewall of the power element through hole 33 is less than 2 mm. The blind plate block 52 can be pushed to the position of the nozzle slide 51 to be replaced by the oil cylinder, so that pouring of the tundish is suspended for replacing the new nozzle slide 51, and other similar structures, such as a pneumatic push rod, can be adopted for replacing, and the like, are not particularly limited herein.
In a preferred embodiment of the present invention, the case structure 1 is made of metal. The metal box body structure is more firm and durable, such as a stainless steel box body structure, a box body structure made of the same material or a box body structure made of iron material, and the like.
In a preferred embodiment of the invention, the top of the box structure 1 is welded to the bottom surface of the floor 62 of the tundish. The fixation between the box body structure and the middle tank is firmer.
In a preferred embodiment of the present invention, the submerged entry nozzle through hole 111 is a circular hole. The submerged nozzle 7 is conveniently installed in the submerged nozzle through hole 111 and then fixed in the submerged nozzle through the support frame.
The protection casting method provided by the invention adopts the protection casting device for continuous casting to carry out casting protection on the joint of the water gap 61 of the tundish and the immersed water gap 7 in the continuous casting process, and comprises the following steps:
step S1, fixing the top opening of a box body structure 1 without a bottom plate on the bottom surface of a bottom plate 62 of a tundish, and installing a water gap quick change device into the box body structure 1 through the bottom of the box body structure 1 to obtain a protection casting structure;
step S2, mounting a bottom plate 1 of a box body structure to the bottom of the box body structure 1 in the protection casting structure, and mounting a submerged nozzle 7 to the inside of a submerged nozzle through hole 111 to obtain a protection casting device to be regulated;
step S3, adjusting the positions of a first push-pull plate 31 and a second push-pull plate 32 on a first side opening 121 of a box body structure 1 in a to-be-adjusted protection casting device, enabling a first half hole 311 on the first push-pull plate 31 and a second half hole 321 on the second push-pull plate 32 to butt joint from two opposite directions of a power element 53 in a water gap quick-change device to form a power element through hole 33, and adjusting a baffle 4 to a second side opening 131 to enable the inside of the box body structure 1 in the to-be-adjusted protection casting device to be in a closed state, so as to obtain the to-be-used protection casting device;
and S4, opening an air source supply switch of a protective air storage device which is pre-installed on the box body structure 1 of the protective casting device to be used, filling protective air at the joint of the water gap communication port 511 and the water gap 61 of the tundish and the joint of the water gap communication port 511 and the immersed water gap 7, and casting molten steel in the tundish into a crystallizer. The submerged nozzle and the nozzle slide block can be replaced according to actual needs in the casting process.
In the process of casting molten steel in a tundish to a crystallizer, when a nozzle slide block 51 in a protective casting device needs to be replaced, a power element 53 is started to enable the power element 53 to push a blind plate block 52 to the position of the nozzle slide block 51, the blind plate block 52 is utilized to block a nozzle 61 of the tundish and a submerged nozzle 7, so that casting of the tundish is suspended, a baffle plate 4 is opened, the nozzle slide block to be replaced is taken out from a second side opening 131 and is placed into a new nozzle slide block, then the positions of a first push-pull plate 31 and a second push-pull plate 32 are adjusted, after the first push-pull plate 31 and the second push-pull plate 32 are pulled to opposite sides, the power element 53 and the blind plate block 52 are taken out from a first side opening 121, and the new nozzle slide block is pushed into a working position from the second side opening 131, the power element 53 and the blind plate block 52 are installed from the first side opening 121 again, the positions of the first push-pull plate 31 and the second push-pull plate 32 on the first side opening 121 of the box body structure 1 are adjusted, the first half hole 311 on the first push-pull plate 31 and the second half hole 321 on the second push-pull plate 32 are butted from two opposite directions of the power element 53 in the water gap quick-changing device to form a power element through hole 33, the baffle plate 4 is adjusted to the second side opening 131, so that the interior of the box body structure 1 is in a closed state again, continuous casting is continued, in order to avoid waste of protective gas, the gas source supply switch of the protective gas storage device is closed first before the water gap sliding block 51 is ready to be replaced, and the gas source supply switch is restarted when the interior of the box body structure 1 is in the closed state again.
After the pouring of the intermediate tank is started, the gas flow in the box body structure 1 needs to be controlled to keep positive pressure in the box body structure 1 all the time, so that air is prevented from entering molten oxide steel.
According to the protective casting device and the protective casting method for continuous casting, the first side opening and the second side opening are formed in the side wall of the box body structure, the first push-pull plate and the second push-pull plate are respectively arranged in two opposite directions of the first side opening, the baffle is arranged on the second side opening in a sliding manner, the blind plate block is arranged on one side of the water gap sliding block, and the power element is connected to the outer side wall of the blind plate block, when the water gap sliding block is replaced, only the power element is required to be started, the power element pushes the blind plate sliding block to the position of the water gap sliding block to be replaced, so that the casting process of the intermediate tank can be suspended, then the first side opening is in an open state by adjusting the positions of the first push-pull plate and the second push-pull plate, the power element and the blind plate block are taken out from the first side opening, and a new water gap sliding block is rapidly placed on a working position from the second side opening, then the blind plate and the power element are placed again through the first side opening, the positions of the first push-pull plate and the second push-pull plate are adjusted, the first push-pull plate and the second push-pull plate are butted from two sides of the power element, the power element is positioned in a power element through hole formed by butting the first push-pull plate and the second push-pull plate, the position of the baffle is adjusted to the second side opening, so that the inside of the box body structure is in a closed state, then an air source supply switch of a protective air supply device is started, the water gap butting position of the water gap communicating opening and the intermediate tank and the water gap butting position of the water gap communicating opening and the immersed water gap are filled with protective air, molten steel in the intermediate tank is cast into a crystallizer, and the problems of secondary pollution, water gap nodulation and the like of molten steel caused by air suction at the water gap butting surface of the water gap communicating opening and the intermediate tank and the immersed water gap butting position can be effectively solved, and when the water gap sliding block is replaced, the positions of the first push-pull plate and the second push-pull plate are only required to be adjusted at the first side opening, and the position of the baffle is only required to be adjusted at the second side opening.
The protection casting device for continuous casting and the protection casting method according to the present invention are described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the protective casting device and the protective casting method for continuous casting as set forth in the present invention described above without departing from the spirit of the present invention. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A protective casting device for continuous casting, characterized by comprising: the top is an open box structure, a water gap quick-changing device and a protective gas supply device; wherein,
the opening of the box body structure is fixedly arranged on the bottom surface of the bottom plate of the middle tank; a bottom plate of the box body structure is provided with a submerged nozzle through hole, and a side wall of the box body structure is provided with a first side opening; a first push-pull plate and a second push-pull plate are respectively arranged in two opposite directions of the first side opening; a first half hole and a second half hole are respectively arranged at the butted end parts of the first push-pull plate and the second push-pull plate, and when the first push-pull plate and the second push-pull plate are pushed and pulled oppositely to the butted position, the first half hole and the second half hole are butted to form a power element through hole; a second side opening corresponding to the first side opening is formed in the side wall of the box body structure, and a baffle is slidably arranged at the second side opening;
the water gap quick-changing device comprises a water gap sliding block arranged in the box body structure, a blind plate block arranged on one side of the water gap sliding block and a power element connected with the outer side wall of the blind plate block; a water gap communicating opening is arranged in the water gap sliding block, the upper end of the water gap communicating opening is in butt joint with the water gap of the intermediate tank, and the lower end of the water gap communicating opening is in butt joint with the upper end of a submerged water gap inserted into the box body structure through the submerged water gap through hole;
the protective gas supply device comprises a first protective gas supply pipe, a second protective gas supply pipe and a protective gas storage device, wherein the first protective gas supply pipe and the second protective gas supply pipe are arranged on the side wall of the box body structure, the protective gas storage device is connected with the first protective gas supply pipe and the second protective gas supply pipe, and the gas outlet end of the first protective gas supply pipe is arranged at the joint of the water gap communication port and the water gap of the intermediate tank; the gas outlet end of the second protective gas supply pipe is arranged at the joint of the water gap communication port and the immersed water gap.
2. The protective casting device for continuous casting according to claim 1, wherein,
one end of the bottom plate of the box body structure is rotationally connected to the bottom of one side wall of the box body structure through a rotating shaft, bolts are arranged on two sides of the top of the bottom plate of the box body structure, and two sides of the bottom plate of the box body structure are fixed on two outer side walls of the box body structure through the bolts.
3. The protective casting device for continuous casting according to claim 1, wherein,
an upper guide plate and a lower guide plate are respectively arranged at the top and the bottom of the first side opening;
an upper chute is formed in the bottom surface of the upper guide plate, a lower chute is formed in the top surface of the lower guide plate, and the upper ends of the first push-pull plate and the second push-pull plate are both arranged in the upper chute; the lower ends of the first push-pull plate and the second push-pull plate are arranged in the lower chute.
4. The protective casting device for continuous casting according to claim 3, wherein,
the length of the first push-pull plate is equal to that of the second push-pull plate; and a power element through hole formed by butting a first half hole on the first push-pull plate with a second half hole on the second push-pull plate is positioned in the middle position of the first side opening.
5. The protective casting device for continuous casting according to claim 1, wherein,
an upper groove plate and a lower groove plate are respectively arranged above and below the second side opening on the outer side wall of the box body structure; the upper end and the lower end of the baffle are respectively arranged in the sliding grooves of the upper groove plate and the lower groove plate.
6. The protective casting device for continuous casting according to claim 1, wherein,
the power element is an oil cylinder;
the shape of the power element through hole is the same as the section shape of the oil cylinder;
the gap between the outer side wall of the oil cylinder and the inner side wall of the power element through hole is smaller than 2 mm.
7. The protective casting device for continuous casting according to claim 1, wherein,
the box body structure is made of metal.
8. The protective casting device for continuous casting according to claim 7, wherein,
the top of the box body structure is welded and fixed on the bottom surface of the bottom plate of the middle tank.
9. The protective casting device for continuous casting according to claim 1, wherein,
the through hole of the submerged nozzle is a circular hole.
10. A method for protecting casting, characterized in that the casting protection of the junction between the water gap of the tundish and the submerged nozzle in the continuous casting process is carried out by adopting the protection casting device for continuous casting according to any one of claims 1 to 9, comprising the following steps:
s1, fixing the top opening of a box body structure without a bottom plate on the bottom surface of the bottom plate of a middle tank, and installing the water gap quick-change device into the box body structure through the bottom of the box body structure to obtain a protection casting structure;
s2, mounting a bottom plate of the box body structure to the bottom of the box body structure in the protection casting structure, and mounting the submerged nozzle to the inside of a through hole of the submerged nozzle to obtain a protection casting device to be regulated;
s3, adjusting positions of a first push-pull plate and a second push-pull plate on a first side opening of a box body structure in the to-be-adjusted protection casting device, enabling a first half hole on the first push-pull plate and a second half hole on the second push-pull plate to be in butt joint with each other from two opposite directions of a power element in the water gap quick-change device to form a power element through hole, and adjusting the baffle to the second side opening to enable the inside of the box body structure in the to-be-adjusted protection casting device to be in a closed state, so as to obtain the to-be-used protection casting device;
and S4, opening an air source supply switch of a protective air storage device which is pre-installed on a box body structure of the to-be-used protective casting device, filling protective air into a joint of the water gap communication port and the water gap of the tundish and a joint of the water gap communication port and the immersed water gap, and casting molten steel in the tundish into a crystallizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311424386.4A CN117505829A (en) | 2023-10-30 | 2023-10-30 | Protective casting device and protective casting method for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311424386.4A CN117505829A (en) | 2023-10-30 | 2023-10-30 | Protective casting device and protective casting method for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117505829A true CN117505829A (en) | 2024-02-06 |
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ID=89746736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311424386.4A Pending CN117505829A (en) | 2023-10-30 | 2023-10-30 | Protective casting device and protective casting method for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117505829A (en) |
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2023
- 2023-10-30 CN CN202311424386.4A patent/CN117505829A/en active Pending
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