CN112808954A - Continuous casting crystallizer device and flow field control method thereof - Google Patents
Continuous casting crystallizer device and flow field control method thereof Download PDFInfo
- Publication number
- CN112808954A CN112808954A CN202110176856.4A CN202110176856A CN112808954A CN 112808954 A CN112808954 A CN 112808954A CN 202110176856 A CN202110176856 A CN 202110176856A CN 112808954 A CN112808954 A CN 112808954A
- Authority
- CN
- China
- Prior art keywords
- electromagnetic
- casting blank
- flow
- adjusting mechanism
- thruster
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a continuous casting crystallizer device and a flow field control method thereof.A set of electromagnetic converters is respectively arranged in an inner arc water tank and an outer arc water tank, each electromagnetic converter comprises two electromagnetic thrusters which are arranged in axial symmetry, the current of each exciting coil and the inclination angle of each electromagnetic thruster are adjusted according to the steel type, the width, the thickness and the drawing speed of a casting blank, the accurate control of the flow speed and the flow of an upper strand and a lower strand is realized, the control precision of the flow speed and the flow is improved, the production requirements of different drawing speeds, steel types and sections can be met, the casting blank quality is improved to the maximum extent, the control mode can be adjusted in real time, the control precision is high, the automatic control can be realized, the continuous casting crystallizer device is favorable for continuous production, and is suitable for the intelligent and automatic production of a continuous casting system.
Description
Technical Field
The invention belongs to the technical field of continuous casting crystallizer control, and particularly relates to a continuous casting crystallizer device and a flow field control method thereof.
Background
At present, the steel making capacity of the world reaches more than 23 hundred million tons, the capacity of China reaches more than 16 hundred million tons, but the steel is mainly crude steel, and has a great gap with refined steel in European and American countries. The most important link for improving the quality of steel is to control the continuous casting process. The crystallizer plays a decisive role as a heart in the continuous casting process, so that the method for improving the flow mode of the molten steel in the crystallizer and optimizing the flow form of the molten steel in the crystallizer become a core link for controlling the steelmaking quality. Generally, molten steel flows into a crystallizer from a water gap, the molten steel should form a 'double-strand flow', the speed of an upward strand flow (referred to as an upper strand flow for short) is preferably 0.2-0.5 m/s, and the molten steel is mainly characterized in that the upper strand flow can promote molten slag at the flow speed, so that the molten slag is not coiled due to liquid level fluctuation; the impact depth of the downward strand (called as the lower strand for short) is not too deep, slag inclusion is not easy to float upwards when the impact depth is too deep, and the flow of molten steel in the crystallizer is not facilitated when the impact depth is too shallow, so that the flow speed and the flow rate of the upper strand and the lower strand are required to be controlled. In addition, the requirements of the height positions of the water gaps and the liquid level of the crystallizer are different for different steel grades, and particularly the height of the water gap is also changed in different pouring periods.
At present, the flow field in the crystallizer is ensured mainly by controlling the casting blank pulling speed and the structure form of a water gap. In the continuous casting production, the influence of the section width, the casting speed (i.e. the casting speed), the casting blank steel grade and the water gap structure on the flow field in the crystallizer is very large, and in order to match the section width and the proper flow form of the casting blank steel grade, the casting blank casting speed is generally controlled or the water gap structure form is generally replaced. As shown in fig. 1 and 2, when the casting speed is increased under the condition that the section width, the casting blank steel grade and the nozzle structure are not changed, the amount of molten steel in the nozzle 2 is increased, and the corresponding flow velocity of the outflow molten steel is increased, so that the flow velocity of the corresponding upper stream 6 and the flow velocity of the corresponding lower stream 7 are increased; under the condition that the section width, the casting blank steel grade and the blank drawing speed are not changed, when the caliber A of the side hole of the water gap 2 is reduced, the corresponding flow velocity of the outflow molten steel is increased, so that the corresponding flow velocities of the upper stream 6 and the lower stream 7 are increased; on the contrary, when the aperture A of the side hole of the nozzle 2 is increased, the corresponding flow velocity of the flowing molten steel is reduced, so that the corresponding flow velocities of the upper stream 6 and the lower stream 7 are reduced; when the side hole inclination angle alpha (the included angle between the opening direction of the side hole and the lower bottom surface of the water gap, and gamma is the included angle between the flow direction of the strand and the lower bottom surface of the water gap) of the water gap 2 is reduced under the conditions of unchanged section width, casting blank steel grade and casting speed, the upper strand 6 is increased, and the lower strand 7 is reduced; conversely, when the side hole inclination angle α of the nozzle 2 increases, the upper stream 6 decreases and the lower stream 7 increases. It can be known that the control of the upper strand flow and the lower strand flow in the crystallizer can be realized by adjusting the withdrawal speed and changing the structural form of the water gap, but the control is not very beneficial to the continuous casting production.
At present, continuous casting machines are developed towards the direction of high operation rate, particularly, the dynamic width adjusting system is generated, the purpose of cross-section continuous operation is completely achieved, but the flow problem cannot be well solved. The current methods are as follows: firstly, the quality is ensured by controlling the pulling speed, so that the production progress is influenced; and secondly, the water gaps with different structural forms are replaced, so that the continuous casting production efficiency is influenced, the water gaps are very unsafe, and the water gaps are very various and are not suitable for intellectualization and unmanned continuous casting production. In addition, the control of the pulling speed and the replacement of the water gap structure can not realize real-time adjustment, and the control precision and the control effect are not ideal. Especially, different flow field forms are caused by different positions of water gaps in different sections and different pouring periods. Therefore, the traditional method for controlling the casting blank pulling speed and the water gap structure form cannot ensure that the strand flow control of the full-flow crystallizer is optimal and the flow field in the crystallizer is optimal.
At present, the research on the control of the flow field in the crystallizer mainly focuses on the electromagnetic braking at high drawing speed, i.e. when the molten steel flows faster, and includes: EMBR Local Field, EMBR Ruler, FC-Mold electromagnetic brake. The structure is only suitable for acting under the condition of high pulling speed, and cannot be used or cannot play a control role for low pulling speed. In addition, the upper and lower flows have the same inhibiting effect, so that the flow rates of the upper and lower flows can only be reduced at the same time, the flow rates and the flow rates of the upper and lower flows cannot be controlled independently, and the adjustment in real time according to the position of the nozzle cannot be performed.
Disclosure of Invention
The invention aims to provide a continuous casting crystallizer device and a flow field control method thereof, and aims to solve the problems that the traditional crystallizer internal flow field control is only suitable for the condition of high casting speed (2 m/min casting speed), has low adaptability, can not independently control the flow velocity and flow of an upper strand and a lower strand, can not be adjusted in real time, has poor control precision, complex operation and low efficiency, is not beneficial to continuous production, and is not suitable for the intellectualization and the unmanned continuous casting production.
The invention solves the technical problems through the following technical scheme: a continuous casting crystallizer device comprises an immersion nozzle, two wide-surface copper plates which are oppositely arranged and two narrow-surface copper plates which are oppositely arranged; further comprising:
the back plate is arranged on one side of each wide-surface copper plate;
the water tank is arranged on one side of each back plate;
each electromagnetic converter comprises two electromagnetic thrusters which are rotatably arranged on the middle shaft and are axially symmetrically distributed, and a first adjusting mechanism for adjusting the inclination angle of each electromagnetic thruster;
the control module is electrically connected with the excitation coil of each electromagnetic thruster and the first adjusting mechanism and used for adjusting the current of each excitation coil and the inclination angle of each electromagnetic thruster according to the steel type of a casting blank, the width of the casting blank, the thickness of the casting blank and the blank drawing speed so as to realize accurate control of the flow speed and the flow rate of an upper strand flow and a lower strand flow;
the inclination angle of the electromagnetic thruster is an included angle between the electromagnetic thruster and a horizontal plane.
In the invention, the electromagnetic thrust of the electromagnetic thruster can be controlled by adjusting the current of the exciting coil, so that the flow velocity of the strand is controlled, wherein the higher the electromagnetic thrust is, the higher the flow velocity of the strand is, and on the contrary, the lower the electromagnetic thrust is, the lower the flow velocity of the strand is; when the strand impacts the narrow-face copper plate, the strand is divided into an upper strand and a lower strand, and the first adjusting mechanism is adjusted, so that the inclination angle of the electromagnetic thruster is adjusted, the flow of the upper strand and the flow of the lower strand are accurately controlled, the larger the inclination angle is, the larger the flow of the lower strand is, the smaller the flow of the upper strand is, and otherwise, the smaller the inclination angle is, the smaller the flow of the lower strand is, and the larger the flow of the upper strand is; in addition, the adjustment of the electromagnetic thrust realizes the accurate control of the flow velocity of the upper stream and the lower stream.
Each electromagnetic thruster corresponds to one first adjusting mechanism (or one electromagnetic converter corresponds to one first adjusting mechanism), and the control module can independently control each first adjusting mechanism, namely the inclination angle of each electromagnetic thruster (or the inclination angles of two electromagnetic thrusters of one electromagnetic converter) can be independently adjusted, so that the flow speed and the flow rate of the upper stream and the lower stream can be independently controlled.
The continuous casting crystallizer device can adjust the current of the exciting coil and the inclination angle of the electromagnetic thruster in real time according to the parameters (casting blank steel type, casting blank width, casting blank thickness and casting speed) provided by the continuous casting machine, realizes the real-time control of the flow speed and the flow of the upper strand and the lower strand, improves the control precision and the production efficiency, is favorable for the intellectualization and the automation of continuous casting production, and meets the production requirements of different casting speeds, different steel types and sections.
Furthermore, cooling water seams are arranged between the back plate and the corresponding wide-surface copper plate.
The two wide-surface copper plates and the two narrow-surface copper plates form a crystallizer, cooling water is injected into the back plate from the lower end of the crystallizer, and flows out from the upper side of the water tank after flowing through the cooling water seam, so that the heat dissipation efficiency of the copper plates is improved.
Preferably, the back plate is made of a non-magnetic material, and the thickness of the back plate is 60-150 mm.
On the premise that the strength requirement is met, the thickness of the back plate is reduced as much as possible, the distance between the electromagnetic converter and the molten steel is reduced, and the acting efficiency of the electromagnetic converter on the strand flow operation is improved.
Preferably, the distance between the back plate and the electromagnetic converter is 3-10 mm.
Furthermore, one end of the first adjusting mechanism is arranged at the end part of the electromagnetic thruster, and the other end of the first adjusting mechanism is arranged on the inner top surface of the water tank; the end part of the electromagnetic thruster is the end of the electromagnetic thruster far away from the middle shaft;
or one end of the first adjusting mechanism is arranged on the intermediate shaft, and the other end of the first adjusting mechanism is arranged on the inner top surface of the water tank.
When the first adjusting mechanisms are positioned at the end parts of the electromagnetic thrusters, each electromagnetic thruster corresponds to one first adjusting mechanism, and the independent control of the inclination angle of each electromagnetic thruster can be realized; when the first adjusting mechanism is positioned on the middle shaft, one electromagnetic converter corresponds to one first adjusting mechanism, and the independent control of the inclination angles of the two electromagnetic thrusters in each electromagnetic converter can be realized.
Furthermore, each electromagnetic converter also comprises a second adjusting mechanism electrically connected with the control module; one end of the second adjusting mechanism is arranged on the intermediate shaft, and the other end of the second adjusting mechanism is arranged on the inner top surface of the water tank;
or one end of the second adjusting mechanism is arranged at the end part of the electromagnetic thruster, and the other end of the second adjusting mechanism is arranged on the inner top surface of the water tank.
The control module controls the first adjusting mechanism and the second adjusting mechanism to act simultaneously, the first adjusting mechanism and the second adjusting mechanism have the same movement speed, and the electromagnetic converter is driven to integrally move up and down, so that the height adjustment of the electromagnetic converter is realized; the control module controls the first adjusting mechanism or the second adjusting mechanism to act to drive one end of the electromagnetic thruster to move up and down, so that the inclination angle of the electromagnetic thruster is adjusted, and the flow speed and the flow of the upper stream and the lower stream are accurately controlled. When the first adjusting mechanisms are connected with the end parts of the electromagnetic thrusters and the second adjusting mechanisms are connected with the middle shaft, the number of the first adjusting mechanisms is the same as that of the electromagnetic thrusters, and one second adjusting mechanism corresponds to two electromagnetic thrusters; when the second adjusting mechanisms are connected with the end parts of the electromagnetic thrusters and the first adjusting mechanisms are connected with the middle shaft, the number of the second adjusting mechanisms is the same as that of the electromagnetic thrusters, and one first adjusting mechanism corresponds to two electromagnetic thrusters.
Preferably, the first adjusting mechanism and the second adjusting mechanism are both hydraulic oil cylinder telescopic mechanisms.
The hydraulic cylinder telescopic mechanism is of an existing structure and comprises a hydraulic cylinder, the control module controls the hydraulic cylinder to work according to parameters provided by the continuous casting machine, a telescopic rod of the hydraulic cylinder is extended out or retracted, one end or two ends of the electromagnetic thruster are driven to move up and down, and therefore the electromagnetic converter can integrally move up and down or the inclination angle of the electromagnetic thruster can be adjusted.
Preferably, a guide rod is provided at least one end of the intermediate shaft, and at least one end of the guide rod is fixed to the water tank.
The guide rod plays a role in guiding the up-and-down movement of the electromagnetic thruster, and the deviation of the electromagnetic thruster in the moving process is avoided.
Furthermore, each electromagnetic thruster comprises an iron core and a plurality of sequentially arranged electromagnetic thrusters surrounding the iron corenAn excitation coil; 1 st of the excitation coil andnthe 2 nd and the 2 nd excitation coils are connected end to endn2+2 said excitation coils are connected end to end, and so on, the firstn2 the excitation coil and the secondnThe excitation coils are connected end to end;
the 1 st said excitation coil, the 2 nd said excitation coil, … …, and the secondnThe/2 excitation coils are connected with the control module through a low-frequency power supply; first, then2+1 of the excitation coilsn2+2 of said excitation coils, … …, andnthe excitation coils are connected in a star shape; whereinnIs an even number;
the number of excitation coils is matched to the form of the low-frequency power supply.
The control module adjusts the current and the frequency of the low-frequency power supply, and therefore the current of the exciting coil is adjusted. When the number of the exciting coils is 6, the corresponding low-frequency power supply is a three-phase alternating-current power supply; when the number of the exciting coils is 4, the corresponding low-frequency power supply is a two-phase alternating-current power supply; and when the number of the exciting coils is other even numbers, the corresponding low-frequency power supply is other phase alternating current power supplies.
Further, the current adjusting range of the exciting coil is 0-1000A, and the inclination angle adjusting range of the electromagnetic thruster is-30-60 degrees.
Preferably, the current adjusting range of the exciting coil is 0-500A, and the inclination angle adjusting range of the electromagnetic thruster is 0-30 degrees.
The invention also provides a flow field control method of the continuous casting crystallizer device, which comprises the following steps:
step 1: acquiring casting blank steel type, casting blank width, casting blank thickness and blank drawing speed;
step 2: and adjusting the current of each excitation coil and the inclination angle of each electromagnetic thruster according to the casting blank steel type, the casting blank width, the casting blank thickness and the blank drawing speed, so as to realize the accurate control of the flow speed and the flow of the upper strand flow and the lower strand flow.
Further, when the casting blank steel type is stainless steel, the casting blank width is 1000mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.5m/min, the current of each exciting coil is controlled to be 0A, the inclination angle of each electromagnetic thruster is 0 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.15 m/s3Min, corresponding to a downstream flow velocity of 0.3m/s and a flow of 0.15m3/min；
When the casting blank steel type is stainless steel, the casting blank width is 1600mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.2m/min, the current of each excitation coil is controlled to be 200A, the inclination angle of each electromagnetic thruster is 0 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.192m3Min, corresponding to a downstream flow velocity of 0.3m/s and a flow rate of 0.192m3/min；
When the casting blank steel is ultra-low carbon steel, the casting blank width is 1000mm,When the thickness of the casting blank is 200mm and the casting speed is 1.3m/min, controlling the current of each excitation coil to be 100A, controlling the inclination angle of each electromagnetic thruster to be 20 degrees, controlling the corresponding upper strand flow velocity to be 0.35m/s and controlling the flow to be 0.1 m/min3Min, corresponding to a downstream flow velocity of 0.5m/s and a flow of 0.16m3/min；
When the casting blank steel type is ultra-low carbon steel, the casting blank width is 1600mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.2m/min, the current of each exciting coil is controlled to be 200A, the inclination angle of each electromagnetic thruster is 20 degrees, the corresponding upper strand flow velocity is 0.35m/s, and the flow is 0.13m3Min, corresponding to a downstream flow velocity of 0.5m/s and a flow of 0.25m3/min；
When the casting blank steel type is high-carbon steel, the casting blank width is 800mm, the casting blank thickness is 200mm, and the blank drawing speed is 2m/min, the current of each exciting coil is controlled to be 100A, the inclination angle of each electromagnetic thruster is 30 degrees, the corresponding upper strand flow velocity is 0.4m/s, and the flow is 0.04 m/s3Min, corresponding to a downstream flow velocity of 0.7m/s and a flow of 0.11m3/min；
When the casting blank steel type is high-carbon steel, the casting blank width is 2000mm, the casting blank thickness is 200mm, and the blank drawing speed is 0.8m/min, the current of each excitation coil is controlled to be 500A, the inclination angle of each electromagnetic thruster is 10 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.07 m/s3Min, corresponding to a downstream flow velocity of 0.4m/s and a flow of 0.09m3/min。
Further, before step 1, the method further comprises a step of selecting a proper submerged nozzle, specifically:
selecting a water gap with a side hole inclination angle alpha of 0 degrees, wherein the caliber of the side hole is A = R multiplied by D multiplied by V multiplied by 10-7And/6, wherein R is the width of the casting blank, D is the thickness of the casting blank, and V is the drawing speed.
When the inclination angle alpha of the side hole is 0 DEG and no electromagnetic converter exists, gamma is equal to alpha; when the inclination angle alpha of the side hole is 0 DEG and the electromagnetic current transformer is arranged, the inclination angle gamma is consistent with that of the electromagnetic thruster.
Further, step 2 is followed by a step of adjusting the height of the electromagnetic converter, specifically:
and the first adjusting mechanism and the second adjusting mechanism are adjusted according to the position of the submerged nozzle, so that the height of the electromagnetic converter is adjusted, the height of the electromagnetic converter is changed along with the position change of the submerged nozzle, and the overall height of the electromagnetic converter is consistent with the position of the submerged nozzle.
The position of the invasive water gap refers to the distance between the center of the side hole and the liquid level, the first adjusting mechanism and the second adjusting mechanism are adjusted simultaneously, and when the movement speeds of the first adjusting mechanism and the second adjusting mechanism are kept consistent, the electromagnetic converter integrally moves up and down, and the height of the electromagnetic converter is changed along with the position change of the invasive water gap according to the position adjustment of the invasive water gap, so that the electromagnetic thrust is favorably concentrated at the side hole of the water gap, and the newly-flowed molten steel is promoted to form a proper flow field. In order to ensure that the height of the electromagnetic converter changes along with the position change of the submerged nozzle, when the inclination angle of the electromagnetic thruster is generally adjusted, an adjusting mechanism for adjusting the end part of the electromagnetic thruster is preferably selected, so that the height of the electromagnetic converter is prevented from being changed when the inclination angle of the electromagnetic thruster is adjusted.
Advantageous effects
Compared with the prior art, the invention has the advantages that:
1. the electromagnetic thrust can be controlled, so that the flow velocity of the upper strand flow and the lower strand flow can be accurately controlled, the device is suitable for the high-pulling-speed condition and the low-pulling-speed condition, the adaptability is high, and the control precision of the flow velocity is improved;
2. the inclination angle of the electromagnetic thruster can be adjusted, so that the flow of the upper stream and the lower stream can be accurately controlled, and the control precision of the flow is improved;
3. each first adjusting mechanism corresponds to one electromagnetic thruster, or one first adjusting mechanism corresponds to two electromagnetic thrusters of each electromagnetic converter, and the inclination angle of each electromagnetic thruster can be independently controlled, or the inclination angles of the two electromagnetic thrusters of each electromagnetic converter can be independently controlled, so that the independent control of the flow of the upper strand flow and the lower strand flow can be realized; the control module can independently control the exciting coil of each electromagnetic thruster, so that the flow rates of the upper stream and the lower stream can be independently controlled;
4. the flow velocity and the flow of the upper strand and the lower strand can be controlled in real time according to the parameters fed back by the continuous casting machine, the control precision is high, the production efficiency is improved, the continuous production is facilitated, and the method is suitable for the intellectualization and the automation of the continuous casting production.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only one embodiment of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic view of a prior art continuous casting mold according to the background of the present invention;
FIG. 2 is a schematic view of the shape of a strand in a prior art continuous casting crystallizer in the background of the invention;
FIG. 3 is a schematic view of the construction of a continuous casting mold apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electromagnetic converter in an embodiment of the present invention;
FIG. 5 is a wiring diagram of an exciting coil of the electromagnetic thruster in the embodiment of the present invention;
FIG. 6 is a schematic view of the shape of a strand in the continuous casting crystallizer apparatus when the electromagnetic converter is not activated according to the embodiment of the present invention;
FIG. 7 is a schematic view of the shape of a strand in the continuous casting mold device when the electromagnetic converter is started according to the embodiment of the present invention;
the device comprises 1-wide-surface copper plate, 2-submerged nozzle, 3-casting blank, 4-narrow-surface copper plate, 5-molten steel liquid level, 6-upper strand flow, 7-lower strand flow, 8-inner arc back plate, 9-outer arc back plate, 10-inner arc water tank, 11-outer arc water tank, 12-electromagnetic converter, 121-first adjusting mechanism/second adjusting mechanism, 122-second adjusting mechanism/first adjusting mechanism, 123-left electromagnetic thruster, 1231-exciting coil, 1232-iron core, 124-right electromagnetic thruster, 125-guide rod, 126-pin shaft, 127-intermediate shaft and 128-electromagnetic thrust direction.
Detailed Description
The technical solutions in the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3, the continuous casting crystallizer device provided by the present embodiment includes a submerged nozzle 2, two wide copper plates 1 arranged oppositely, two narrow copper plates 4 arranged oppositely, an inner arc back plate 8 and an outer arc back plate 9, an inner arc water tank 10 and an outer arc water tank 11, an electromagnetic converter 12, and a control module; the inner arc back plate 8 and the outer arc back plate 9 are respectively arranged on one side of the two wide-surface copper plates 1 which are oppositely arranged; the inner arc water tank 10 is arranged on one side of the inner arc backboard 8, and the outer arc water tank 11 is arranged on one side of the outer arc backboard 9; an electromagnetic converter 12 is arranged in each of the inner arc water tank 10 and the outer arc water tank 11; each electromagnetic current transformer 12 includes a left electromagnetic thruster 123 and a right electromagnetic thruster 124 which are rotatably provided on the intermediate shaft 127 and are axially symmetrically distributed, and a first adjusting mechanism 121/122 (shown in fig. 4) for adjusting the tilt angles of the left electromagnetic thruster 123 and the right electromagnetic thruster 124; the control module is used for adjusting the current of each excitation coil 1231 and the inclination angle of each electromagnetic thruster according to the steel type of the casting blank, the width of the casting blank, the thickness of the casting blank and the drawing speed, so that the flow speed and the flow of the upper strand 6 and the lower strand 7 can be accurately controlled. The inclination angle of the electromagnetic thruster is an included angle beta between the electromagnetic thruster and the horizontal plane.
The inner arc backboard 8 and the outer arc backboard 9 are both fixed together with the corresponding wide-surface copper plate 1, the wide-surface copper plate 1 is used as an important heat conducting component from liquid molten steel to solidification into a solid blank shell in continuous casting, in order to improve the heat dissipation effect of the wide-surface copper plate 1, cooling water seams are arranged in the middle between the inner arc backboard 8 and the corresponding wide-surface copper plate, and between the outer arc backboard 9 and the corresponding wide-surface copper plate 1, cooling water is injected into the inner arc backboard 8 or the outer arc backboard 9 from the lower end of the crystallizer, and flows out from the upper side of the inner arc water tank 10 or the outer arc water tank 11 after flowing through the corresponding cooling water seams, so that the heat dissipation efficiency of the wide-surface copper plate is improved.
The inner arc water tank 10 and the outer arc water tank 11 are made of non-magnetic materials, and are different from other crystallizer structural forms, a cavity needs to be formed in the centers of the inner arc water tank 11 and the outer arc water tank 11, the cavity is used for mounting the electromagnetic current transformer 12, and one end of the first adjusting mechanism 121/122 and one end of the second adjusting mechanism 122/121 of the electromagnetic current transformer 12 are fixed on the inner top surface of the water tanks.
As shown in fig. 4, there are two different implementations of the mounting positions of the first adjustment mechanism 121/122 and the second adjustment mechanism 122/121:
the first one is that each electromagnetic thruster corresponds to a first adjusting mechanism 121/122 (in this case, the first adjusting mechanism refers to an adjusting mechanism at the end of the electromagnetic thruster), and each electromagnetic current transformer 12 corresponds to a second adjusting mechanism 122/121 (in this case, the second adjusting mechanism refers to an adjusting mechanism on the intermediate shaft); at this time, one end of the first adjusting mechanism 121/122 is fixedly connected with the end of the electromagnetic thruster (the end far away from the intermediate shaft 127) through the pin 126, and the other end is fixed on the inner top surface of the water tank; one end of the second adjusting mechanism 122/121 is fixedly connected with the intermediate shaft 127, and the other end is fixed on the inner top surface of the water tank. When the two first adjustment mechanisms 121/122 and the one second adjustment mechanism 122/121 are not operated, the electromagnetic current transformer 12 is kept stable, and the tilt angle β of each electromagnetic thruster is not changed.
When one of the first adjusting mechanisms 121/122 is operated, the electromagnetic thruster corresponding to the first adjusting mechanism 121/122 is operated to adjust the inclination angle β of the electromagnetic thruster, when the first adjusting mechanism 121/122 moves downward, the inclination angle β of the electromagnetic thruster is increased, and the flow rate of the next jet 7 is increased, whereas when the first adjusting mechanism 121/122 moves upward, the inclination angle β of the electromagnetic thruster is decreased, and the flow rate of the next jet 7 is decreased;
when the second adjustment mechanism 122/121 is operated, the left electromagnetic thruster 123 and the right electromagnetic thruster 124 corresponding to the second adjustment mechanism 122/121 are simultaneously operated (one end of the electromagnetic thruster connected to the intermediate shaft 127 is operated), the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously adjusted, when the second adjustment mechanism 122/121 moves downward, the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously increased, and the flow rates of the left lower jet 7 and the right lower jet 7 are simultaneously increased, whereas when the second adjustment mechanism 122/121 moves upward, the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously decreased, and the flow rates of the left lower jet 7 and the right lower jet 7 are simultaneously decreased;
when the two first adjustment mechanisms 121/122 and the second adjustment mechanism 122/121 are simultaneously operated, the entire electromagnetic converter 12 moves up and down, and the tilt angle β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 is kept constant.
The second one is a second adjusting mechanism 121/122 corresponding to each electromagnetic thruster (in this case, the second adjusting mechanism is an adjusting mechanism at the end of the electromagnetic thruster), and each electromagnetic current transformer 12 is a first adjusting mechanism 122/121 corresponding to each electromagnetic current transformer (in this case, the first adjusting mechanism is an adjusting mechanism on the intermediate shaft); at this time, one end of the second adjusting mechanism 121/122 is fixedly connected with the end of the electromagnetic thruster (the end far away from the intermediate shaft 127) through the pin 126, and the other end is fixed on the inner top surface of the water tank; one end of the first adjusting mechanism 122/121 is fixedly connected with the intermediate shaft 127, and the other end is fixed on the inner top surface of the water tank. When the two second adjustment mechanisms 121/122 and the one first adjustment mechanism 122/121 are not operated, the electromagnetic current transformer 12 is kept stable, and the inclination angle β of each electromagnetic thruster is not changed.
When one of the second adjusting mechanisms 121/122 is operated, the electromagnetic thruster corresponding to the second adjusting mechanism 121/122 is operated to adjust the inclination angle β of the electromagnetic thruster, when the second adjusting mechanism 121/122 moves downward, the inclination angle β of the electromagnetic thruster is increased, and the flow rate of the next jet 7 is increased, whereas when the second adjusting mechanism 121/122 moves upward, the inclination angle β of the electromagnetic thruster is decreased, and the flow rate of the next jet 7 is decreased;
when the first adjustment mechanism 122/121 is operated, the left electromagnetic thruster 123 and the right electromagnetic thruster 124 corresponding to the first adjustment mechanism 122/121 are simultaneously operated (one end of the electromagnetic thruster connected to the intermediate shaft 127 is operated), the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously adjusted, when the first adjustment mechanism 122/121 moves downward, the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously increased, and the flow rates of the left lower jet 7 and the right lower jet 7 are simultaneously increased, whereas when the first adjustment mechanism 122/121 moves upward, the tilt angles β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 are simultaneously decreased, and the flow rates of the left lower jet 7 and the right lower jet 7 are simultaneously decreased;
when the two second adjustment mechanisms 121/122 and the first adjustment mechanism 122/121 are simultaneously operated, the entire electromagnetic converter 12 moves up and down, and the tilt angle β of the left electromagnetic thruster 123 and the right electromagnetic thruster 124 is kept constant.
The inclination angle beta of the electromagnetic thruster can be changed no matter the adjusting mechanism on the intermediate shaft is adjusted or the adjusting mechanism at the end part of the electromagnetic thruster is adjusted, but when the adjusting mechanism on the intermediate shaft is adjusted, the position of the intermediate shaft relative to the invasive water gap is changed, namely the height of the electromagnetic converter is changed, and at the moment, the position of the invasive water gap is not changed; in order to ensure that the height of the electromagnetic converter changes along with the change of the position B of the submerged nozzle, when the inclination angle of the electromagnetic thruster is generally adjusted, an adjusting mechanism for adjusting the end part of the electromagnetic thruster is preferably selected, so that the height of the electromagnetic converter is prevented from being changed when the inclination angle of the electromagnetic thruster is adjusted; the height of the electromagnetic converter changes along with the change of the position B of the invasive water gap, namely the position of a middle shaft of the electromagnetic converter is consistent with the position B of the invasive water gap, so that the electromagnetic thrust is favorably concentrated at the position of the side hole of the water gap, and the molten steel flowing out of the side hole of the water gap is favorably distributed, so that the newly flowing molten steel is promoted to form a proper flow field.
In this embodiment, in order to ensure that the electromagnetic thruster does not deviate in the up-and-down moving process, two guide rods 125 are arranged at the bottom or the top of the water tank, two ends of the intermediate shaft 127 are respectively sleeved on the two guide rods 125, and the guide rods 125 play a role in guiding the up-and-down moving of the electromagnetic thruster.
In this embodiment, first adjustment mechanism and second adjustment mechanism are hydraulic cylinder telescopic machanism, and hydraulic cylinder telescopic machanism is current structure, and hydraulic cylinder telescopic machanism includes hydraulic cylinder at least, and control module is according to the parameter control hydraulic cylinder work that the conticaster provided, stretches out or retracts hydraulic cylinder's telescopic link, drives the one end or both ends of electromagnetic thruster and reciprocates to realize that electromagnetic converter 12 wholly reciprocates, or realize electromagnetic thruster's inclination and adjust.
Another implementation manner of the first adjusting mechanism and the second adjusting mechanism is as follows: the driving motor or the stepping motor and the screw rod are in a structural form, namely the driving motor or the stepping motor is controlled by the control module, the output end of the driving motor or the stepping motor is connected with the screw rod pair, the screw rod pair moves linearly by the rotation of the driving motor or the stepping motor, and one end or two ends of the electromagnetic thruster are driven to move up and down, so that the electromagnetic converter 12 moves up and down integrally, or the inclination angle of the electromagnetic thruster is adjusted.
The electromagnetic converters 12 are used in pairs, and the two electromagnetic converters 12 are respectively installed in the inner arc water tank 10 and the outer arc water tank 11. Under the simultaneous action of the first adjusting mechanism 121/122 and the second adjusting mechanism 122/121, the electromagnetic converter 12 can move up and down integrally and is composed of a left electromagnetic thruster 123 and a right electromagnetic thruster 124 which can rotate around a middle shaft 127, the left electromagnetic thruster 123 and the right electromagnetic thruster 124 form a V-shaped structure, an included angle beta between the electromagnetic thrusters and the horizontal plane can be adjusted independently, the adjusting range is-30-60 degrees, and as shown in fig. 4, the adjusting range of the inclination angle of each electromagnetic thruster is preferably 0-30 degrees. 30 degrees represents an included angle between the electromagnetic thruster and the horizontal plane when the end part of the electromagnetic thruster is higher than the middle shaft, and 30 degrees represents an included angle between the electromagnetic thruster and the horizontal plane when the end part of the electromagnetic thruster is lower than the middle shaft.
The current form of the electromagnetic converter 12 may include various forms, such as a two-phase, three-phase or other phase system ac power source, the phase angles of which are 0 ° and 90 °; the phase angles of the three-phase alternating current power supply are respectively 0 degrees, 120 degrees and-120 degrees, but the generated electromagnetic thrust is along the flow direction of the molten steel stream, and the electromagnetic thrust plays a role in promoting the movement of the molten steel stream.
Each electromagnetic thruster comprises an iron core 1232 and a plurality of exciting coils 1231 arranged around the iron core 1232, the exciting coils 1231 of the electromagnetic thrusters are electrically connected with the control module through the low-frequency power supply, and the control module adjusts the current and the frequency of the low-frequency power supply, so that the current of the exciting coils 1231 is adjusted. The low frequency power source may be a two-phase, three-phase or other phase ac power source, and the form of the low frequency power source is determined by the number of exciting coils 1231. For example, when the number of the excitation coils 1231 is 6, the corresponding low-frequency power supply is a three-phase ac power supply; when the number of the exciting coils 1231 is 4, the corresponding low-frequency power supply is a two-phase alternating-current power supply; when the number of the excitation coils 1231 is an even number, the corresponding low-frequency power supply is an alternating-current power supply of another phase.
Let the number of the excitation coils 1231 of each electromagnetic thruster benThe number of the main components is one,nthe exciting coils 1231 are orderly arranged on the iron core 1232, the 1 st exciting coil and the 1 st exciting coilnThe 2+1 excitation coils are connected end to end, and the 2 nd excitation coil is connected with the 2 nd excitation coilnThe 2+2 exciting coils are connected end to end, and so on, the firstn2 exciting coil and the secondnThe excitation coils are connected end to end; 1 st excitation coil, 2 nd excitation coil, … …, andnthe/2 excitation coils are connected with the control module through a low-frequency power supply; first, then2+1 excitation coils, thn2+2 excitation coils, … …, andnthe excitation coils are connected in a star shape. The number of excitation coils is matched to the form of the low-frequency power supply.
As shown in fig. 5, the number of the excitation coils 1231 of each electromagnetic thruster is 6, and the low frequency power supply is in the form of a three-phase ac power supply. The number of 6 exciting coils of the left electromagnetic thruster 123 in the outer arc water tank 11 is 1-1, 1-2, 1-3, 1-4, 1-5 and 1-6 in sequence, the number of 6 exciting coils of the right electromagnetic thruster 124 in the outer arc water tank 11 is 2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 in sequence, the number of 6 exciting coils of the left electromagnetic thruster 123 in the inner arc water tank 10 is 3-1, 3-2, 3-3, 3-4, 3-5 and 3-6 in sequence, and the number of 6 exciting coils of the right electromagnetic thruster 124 in the inner arc water tank 10 is 4-1, 4-2, 4-3, 4-4, 4-5 and 4-6 in sequence. An excitation coil 1-1 and an excitation coil 1-4 are connected end to end, an excitation coil 1-2 and an excitation coil 1-5 are connected end to end, an excitation coil 1-3 and an excitation coil 1-6 are connected end to end, alternating currents of 0 degrees, 120 degrees and-120 degrees are respectively conducted on the excitation coils U1, V1 and W1, and 3 connectors at the other ends of the excitation coils 1-4, the excitation coils 1-5 and the excitation coils 1-6 are connected into a star point; the excitation coil 2-1 and the excitation coil 2-4 are connected end to end, the excitation coil 2-2 and the excitation coil 2-5 are connected end to end, the excitation coil 2-3 and the excitation coil 2-6 are connected end to end, the U2, the V2 and the W2 are respectively electrified with alternating currents of 0 degrees, 120 degrees and-120 degrees, and the other ends of the excitation coil 2-4, the excitation coil 2-5 and the excitation coil 2-6 are star points; an excitation coil 3-1 and an excitation coil 3-4 are connected end to end, an excitation coil 3-2 and an excitation coil 3-5 are connected end to end, an excitation coil 3-3 and an excitation coil 3-6 are connected end to end, an excitation coil 3-1 and an excitation coil 3-4 are connected end to end, alternating currents of 0 degrees, 120 degrees and-120 degrees are respectively conducted on U3, V3 and W3, and the other ends of the excitation coil 3-4, the excitation coil 3-5 and the excitation coil 3-6 are connected as star points; when the excitation coil 4-1 and the excitation coil 4-4 are connected end to end, the excitation coil 4-2 and the excitation coil 4-5 are connected end to end, the excitation coil 4-3 and the excitation coil 4-6 are connected end to end, the excitation coil 4-1 and the excitation coil 4-4 are connected end to end, the other ends of the excitation coil 4-4, the excitation coil 4-5 and the excitation coil 4-6 are connected as a star point, and the U1, the V1, the W1, the U2, the V2, the W2, the U3, the V3, the W3, the U4, the V4 and the W4 are all powered on for 0 degrees and 120 degrees and-120 degrees of alternating current, the two electromagnetic thrusters of the electromagnetic converter 12 generate electromagnetic thrust along the strand flow direction, so that the movement of the molten steel strand flow is promoted.
When the current of the excitation coil 1231 increases, the corresponding electromagnetic thrust increases, thereby increasing the flow rates of the corresponding upper and lower flows 6 and 7; conversely, when the current of the excitation coil 1231 decreases, the corresponding electromagnetic thrust decreases, thus reducing the flow rate of the corresponding upper and lower flows 6 and 7. Since the current magnitude of the exciting coil 1231 of each electromagnetic thruster can be controlled individually, the flow rates of the upper and lower flows 6 and 7 of each side can be controlled individually.
The current regulation range of the exciting coil is 0-1000A, preferably 0-500A.
As shown in fig. 6, when the electromagnetic converter 12 is not started, the shape of the strand in the continuous casting crystallizer device is schematically shown, and when the electromagnetic converter is not started, the velocity of the strand is not enough, and the strand cannot reach the narrow-plane copper plate, so that the upper strand 6 and the lower strand 7 cannot be formed properly, which is not beneficial to production.
As shown in fig. 7, when the electromagnetic converter 12 is started, the shape of the strand in the continuous casting crystallizer device is schematically illustrated, and when the electromagnetic converter works, the speed of the strand is increased under the promoting action of the electromagnetic thrust, so that the strand can be promoted to impact the narrow-surface copper plate, a proper flow field can be formed, and the effect achieved by changing the inclination angle of the nozzle is consistent (at this time, the inclination angle α of the nozzle is 0 °). In fig. 7, when the nozzle inclination angle α is 0 °, γ is the same as the inclination angle β of the electromagnetic thruster under the action of the electromagnetic converter, and γ is the angle between the jet flow direction and the lower bottom surface (or horizontal surface) of the nozzle.
In this embodiment, the control module is a PLC controller, a single chip microcomputer, or a microcontroller.
The present embodiment further provides a flow field control method of the continuous casting crystallizer apparatus, which includes the following steps:
1. a suitable submerged entry nozzle 2 is selected.
The proper nozzle 2 needs to be selected, the inclination angle alpha of the side hole is 0 degrees, the aperture A of the side hole of the nozzle 2 is generally selected to be larger, the specific numerical value is selected according to the steel grade produced by different continuous casting machines, the section and the pulling speed, the flow velocity of the strand at the side hole of the nozzle 2 is the standard, and the flow velocity of the strand is generally lower than 0.5 m/s. Specifically, the side hole diameter a = R × D × V × 10-7And/6, wherein R is the width of the casting blank, D is the thickness of the casting blank, and V is the drawing speed. The dip angle alpha of the side hole of the invasive water gap is selected to be 0 degrees, and the effect of forming a proper flow field can be achieved by adjusting the dip angle beta of the electromagnetic thruster without changing the dip angle of the side hole of the water gap as verified by figures 6 and 7.
2. And obtaining the casting blank steel type, the casting blank width, the casting blank thickness and the blank drawing speed.
The continuous casting machine system is communicated with the control module, and feeds back the casting blank steel type, the casting blank width, the casting blank thickness and the blank drawing speed to the control module in real time.
3. The control module adjusts the current of each excitation coil 1231 and the inclination angle of each electromagnetic thruster according to the steel type of the casting blank, the width of the casting blank, the thickness of the casting blank and the drawing speed, so that the flow speed and the flow rate of the upper strand 6 and the lower strand 7 can be accurately controlled.
When the current of the exciting coil 1231 is increased, the electromagnetic thrust is increased, and the flow velocity of the jet flow is increased; conversely, when the current of the excitation coil 1231 decreases, the electromagnetic thrust decreases and the flow rate of the jet decreases. When the first adjustment mechanism 121/122 or the second adjustment mechanism 122/121 moves up and down, the tilt angle of the electromagnetic thruster increases or decreases, and the flow rate of the jet increases or decreases.
Specifically, when the casting blank steel type is stainless steel, the casting blank width is 1000mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.5m/min, the current of each exciting coil is controlled to be 0A, the inclination angle of each electromagnetic thruster is 0 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.15 m/s3Min, corresponding to a downstream flow velocity of 0.3m/s and a flow of 0.15m3/min；
When the casting blank steel type is stainless steel, the casting blank width is 1600mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.2m/min, the current of each excitation coil is controlled to be 200A, the inclination angle of each electromagnetic thruster is 0 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.192m3Min, corresponding to a downstream flow velocity of 0.3m/s and a flow rate of 0.192m3/min；
When the casting blank steel type is ultra-low carbon steel, the casting blank width is 1000mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.3m/min, the current of each exciting coil is controlled to be 100A, the inclination angle of each electromagnetic thruster is 20 degrees, the corresponding upper strand flow velocity is 0.35m/s, and the flow is 0.1m3Min, corresponding to a downstream flow velocity of 0.5m/s and a flow of 0.16m3/min；
When the casting blank steel grade is ultra-low carbonControlling the current of each exciting coil to be 200A when the width of the steel and the casting blank is 1600mm, the thickness of the casting blank is 200mm, and the blank drawing speed is 1.2m/min, wherein the inclination angle of each electromagnetic thruster is 20 degrees, the corresponding upper strand flow velocity is 0.35m/s, and the flow is 0.13 m/s3Min, corresponding to a downstream flow velocity of 0.5m/s and a flow of 0.25m3/min；
When the casting blank steel type is high-carbon steel, the casting blank width is 800mm, the casting blank thickness is 200mm, and the blank drawing speed is 2m/min, the current of each exciting coil is controlled to be 100A, the inclination angle of each electromagnetic thruster is 30 degrees, the corresponding upper strand flow velocity is 0.4m/s, and the flow is 0.04 m/s3Min, corresponding to a downstream flow velocity of 0.7m/s and a flow of 0.11m3/min；
When the casting blank steel type is high-carbon steel, the casting blank width is 2000mm, the casting blank thickness is 200mm, and the blank drawing speed is 0.8m/min, the current of each excitation coil is controlled to be 500A, the inclination angle of each electromagnetic thruster is 10 degrees, the corresponding upper strand flow velocity is 0.3m/s, and the flow is 0.07 m/s3Min, corresponding to a downstream flow velocity of 0.4m/s and a flow of 0.09m3/min。
Taking ultra-low carbon steel as an example, because the width of a casting blank is different and the casting speed is different, the total molten steel flow rate is changed, so that the distribution of an upper strand flow and a lower strand flow is different, and the upper strand flow rate + the lower strand flow rate = the width of the casting blank x the thickness of the casting blank x the casting speed.
4. Adjusting the height of the electromagnetic converter 12
The first adjusting mechanism 121/122 and the second adjusting mechanism 122/121 are adjusted simultaneously according to the position of the submerged nozzle 2, and the adjusting speeds of the first adjusting mechanism 121/122 and the second adjusting mechanism 122/121 are consistent, so that the overall height of the electromagnetic converter 12 is adjusted, and the overall height of the electromagnetic converter 12 is consistent with the position B of the submerged nozzle 2.
The position B of the invasive water gap refers to the distance between the center of the side hole and the liquid level 5, the first adjusting mechanism 121/122 and the second adjusting mechanism 122/121 are adjusted simultaneously, and when the movement speeds of the first adjusting mechanism 121/122 and the second adjusting mechanism 122/121 are kept consistent, the electromagnetic converter 12 integrally moves up and down, and the height of the electromagnetic converter 12 is changed along with the change of the position B of the invasive water gap according to the adjustment of the position B of the invasive water gap, so that the electromagnetic thrust is concentrated at the side hole of the water gap, and the newly inflowing molten steel is promoted to form a proper flow field. In order to ensure that the height of the electromagnetic converter 12 changes with the change of the position B of the submerged nozzle, generally, when the inclination angle β of the electromagnetic thruster is adjusted, an adjusting mechanism for adjusting the end portion of the electromagnetic thruster is preferably selected, so that the height of the electromagnetic converter 12 is prevented from being changed when the inclination angle β of the electromagnetic thruster is adjusted. Of course, when the height of the electromagnetic current transformer 12 is adjusted, it is also preferable to adjust the overall height of the electromagnetic current transformer 12, that is, to adjust the first adjustment mechanism and the second adjustment mechanism at the same time, rather than to adjust the height of the intermediate shaft 127 alone (adjust only the adjustment mechanism on the intermediate shaft), because adjusting only the height of the intermediate shaft 127 changes the height of the electromagnetic current transformer 12, but also changes the inclination angle of the electromagnetic thruster, resulting in a change in the flow rate and the flow rate.
The invention provides a continuous casting crystallizer device and a flow field control method thereof, which can realize the accurate control of the flow speed and the flow rate of an upper strand flow and a lower strand flow according to the real-time adjustment of the current of each exciting coil and the inclination angle of each electromagnetic thruster according to the casting blank steel type, the casting blank width, the casting blank thickness and the casting speed without adjusting the casting blank casting speed or replacing the structure form of a water gap, thereby meeting the production requirements of different casting speeds, steel types, sections and different pouring periods; meanwhile, the control mode can be adjusted in real time, is high in control precision, can be automatically controlled, is beneficial to continuous production, and is suitable for intellectualization and automation of a continuous casting system.
The above disclosure is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or modifications within the technical scope of the present invention, and shall be covered by the scope of the present invention.
Claims (10)
1. A continuous casting crystallizer device comprises an immersion nozzle, two wide-surface copper plates which are oppositely arranged and two narrow-surface copper plates which are oppositely arranged; it is characterized by also comprising:
the back plate is arranged on one side of each wide-surface copper plate;
the water tank is arranged on one side of each back plate;
each electromagnetic converter comprises two electromagnetic thrusters which are rotatably arranged on the middle shaft and are axially symmetrically distributed, and a first adjusting mechanism for adjusting the inclination angle of each electromagnetic thruster;
the control module is electrically connected with the excitation coil of each electromagnetic thruster and the first adjusting mechanism and used for adjusting the current of each excitation coil and the inclination angle of each electromagnetic thruster according to the steel type of a casting blank, the width of the casting blank, the thickness of the casting blank and the blank drawing speed so as to realize accurate control of the flow speed and the flow rate of an upper strand flow and a lower strand flow;
the inclination angle of the electromagnetic thruster is an included angle between the electromagnetic thruster and a horizontal plane.
2. The continuous casting mold device of claim 1, wherein: cooling water seams are arranged between the back plate and the corresponding wide-surface copper plate;
preferably, the back plate is made of a non-magnetic material, and the thickness of the back plate is 60-150 mm;
preferably, the distance between the back plate and the electromagnetic converter is 3-10 mm.
3. The continuous casting mold device of claim 1, wherein: one end of the first adjusting mechanism is arranged at the end part of the electromagnetic thruster, and the other end of the first adjusting mechanism is arranged on the inner top surface of the water tank; the end part of the electromagnetic thruster is the end of the electromagnetic thruster far away from the middle shaft;
or one end of the first adjusting mechanism is arranged on the intermediate shaft, and the other end of the first adjusting mechanism is arranged on the inner top surface of the water tank.
4. The continuous casting mold device of claim 1, wherein: each electromagnetic converter further comprises a second adjusting mechanism electrically connected with the control module; one end of the second adjusting mechanism is arranged on the intermediate shaft, and the other end of the second adjusting mechanism is arranged on the inner top surface of the water tank;
or one end of the second adjusting mechanism is arranged at the end part of the electromagnetic thruster, and the other end of the second adjusting mechanism is arranged on the inner top surface of the water tank;
preferably, the first adjusting mechanism and the second adjusting mechanism are both hydraulic oil cylinder telescopic mechanisms;
preferably, a guide rod is provided at least one end of the intermediate shaft, and at least one end of the guide rod is fixed to the water tank.
5. The continuous casting mold device according to any one of claims 1 to 4, characterized in that: each electromagnetic thruster comprises an iron core and a plurality of sequentially arranged electromagnetic thrusters surrounding the iron corenAn excitation coil; 1 st of the excitation coil andnthe 2 nd and the 2 nd excitation coils are connected end to endn2+2 said excitation coils are connected end to end, and so on, the firstn2 the excitation coil and the secondnThe excitation coils are connected end to end;
the 1 st said excitation coil, the 2 nd said excitation coil, … …, and the secondnThe/2 excitation coils are connected with the control module through a low-frequency power supply; first, then2+1 of the excitation coilsn2+2 of said excitation coils, … …, andnthe excitation coils are connected in a star shape; whereinnIs an even number.
6. The continuous casting mold device of claim 1, wherein: the current adjusting range of the exciting coil is 0-1000A, and the inclination angle adjusting range of the electromagnetic thruster is-30-60 degrees;
preferably, the current adjusting range of the exciting coil is 0-500A, and the inclination angle adjusting range of the electromagnetic thruster is 0-30 degrees.
7. A flow field control method of a continuous casting crystallizer device as claimed in any one of claims 1 to 6, characterized by comprising the steps of:
step 1: acquiring casting blank steel type, casting blank width, casting blank thickness and blank drawing speed;
step 2: and adjusting the current of each excitation coil and the inclination angle of each electromagnetic thruster according to the casting blank steel type, the casting blank width, the casting blank thickness and the blank drawing speed, so as to realize the accurate control of the flow speed and the flow of the upper strand flow and the lower strand flow.
8. The flow field control method of a continuous casting mold device according to claim 7, wherein:
when the casting blank steel type is stainless steel, the casting blank width is 1000mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.5m/min, controlling the current of each excitation coil to be 0A, and controlling the inclination angle of each electromagnetic thruster to be 0 degree;
when the casting blank steel type is stainless steel, the casting blank width is 1600mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.2m/min, controlling the current of each excitation coil to be 200A, and controlling the inclination angle of each electromagnetic thruster to be 0 degree;
when the casting blank steel type is ultra-low carbon steel, the casting blank width is 1000mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.3m/min, controlling the current of each exciting coil to be 100A, and controlling the inclination angle of each electromagnetic thruster to be 20 degrees;
when the casting blank steel type is ultra-low carbon steel, the casting blank width is 1600mm, the casting blank thickness is 200mm, and the blank drawing speed is 1.2m/min, controlling the current of each exciting coil to be 200A, and controlling the inclination angle of each electromagnetic thruster to be 20 degrees;
when the casting blank steel type is high-carbon steel, the casting blank width is 800mm, the casting blank thickness is 200mm, and the blank drawing speed is 2m/min, controlling the current of each excitation coil to be 100A, and controlling the inclination angle of each electromagnetic thruster to be 30 degrees;
when the casting blank steel type is high-carbon steel, the casting blank width is 2000mm, the casting blank thickness is 200mm, and the blank drawing speed is 0.8m/min, the current of each excitation coil is controlled to be 500A, and the inclination angle of each electromagnetic thruster is 10 degrees.
9. The flow field control method of a continuous casting mold device according to claim 7 or 8, characterized in that: before the step 1, the method further comprises the step of selecting a proper submerged nozzle, specifically:
selecting a water gap with a side hole inclination angle alpha of 0 degrees, wherein the caliber of the side hole is A = R multiplied by D multiplied by V multiplied by 10-7And/6, wherein R is the width of the casting blank, D is the thickness of the casting blank, and V is the drawing speed.
10. The flow field control method of a continuous casting mold device according to claim 7 or 8, characterized in that: the step 2 is followed by a step of adjusting the height of the electromagnetic converter, specifically comprising:
and the first adjusting mechanism and the second adjusting mechanism are adjusted according to the position of the submersed nozzle, so that the height of the electromagnetic converter is adjusted, and the height of the electromagnetic converter is changed along with the position change of the submersed nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176856.4A CN112808954A (en) | 2021-02-07 | 2021-02-07 | Continuous casting crystallizer device and flow field control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110176856.4A CN112808954A (en) | 2021-02-07 | 2021-02-07 | Continuous casting crystallizer device and flow field control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112808954A true CN112808954A (en) | 2021-05-18 |
Family
ID=75864525
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110176856.4A Pending CN112808954A (en) | 2021-02-07 | 2021-02-07 | Continuous casting crystallizer device and flow field control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112808954A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346188A (en) * | 2022-01-14 | 2022-04-15 | 华北理工大学 | Flow field control and regulation device for ultrahigh-speed continuous casting crystallizer |
| CN115383064A (en) * | 2022-08-30 | 2022-11-25 | 上海交通大学 | Continuous liquid-changing hot type continuous casting metal purification method combined with traveling wave magnetic field electromagnetic stirring |
-
2021
- 2021-02-07 CN CN202110176856.4A patent/CN112808954A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346188A (en) * | 2022-01-14 | 2022-04-15 | 华北理工大学 | Flow field control and regulation device for ultrahigh-speed continuous casting crystallizer |
| CN114346188B (en) * | 2022-01-14 | 2023-03-28 | 华北理工大学 | Flow field control and regulation device for ultrahigh-speed continuous casting crystallizer |
| CN115383064A (en) * | 2022-08-30 | 2022-11-25 | 上海交通大学 | Continuous liquid-changing hot type continuous casting metal purification method combined with traveling wave magnetic field electromagnetic stirring |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112808954A (en) | Continuous casting crystallizer device and flow field control method thereof | |
| KR102305894B1 (en) | Mixing eductor nozzle and flow control device | |
| CN108500227A (en) | Crystallizer flow field Electromagnetic Control method for sheet billet continuous casting production | |
| CN104126024B (en) | Electromagnetism wiping device, including the manufacture method of its electroplating steel plate wiping device and electroplating steel plate | |
| CN104759597B (en) | A kind of magnetic stirrer and its dynamic control method for continuous casting and solidifying end | |
| CN1449313A (en) | Method and device for continuous casting of metals in a mold | |
| CN104827007A (en) | Large-scale uniform-structure alloy ingot continuous casting preparation method and magnetic control electroslag continuous casting device | |
| CN101346200B (en) | Method and apparatus for the continuous casting of steel beam blanks, especially double-T-bleam blanks | |
| CN101172312A (en) | Electromagnetic control electro-gas welding method and equipment thereof | |
| CN114309509B (en) | Vertical continuous casting time-space electromagnetic stirring mode control method and device thereof | |
| CN1023720C (en) | Continuous chromium plating for super long shaft and its apparatus | |
| CN214601814U (en) | Continuous casting crystallizer device | |
| CN113426970B (en) | Vertical semi-continuous production device and production process of large round billets with phi of 1000 mm-2000 mm | |
| CN207552425U (en) | Air knife regulating mechanism | |
| CA2730616A1 (en) | Electromagnetic braking device on continuous casting molds | |
| AU2004286877A1 (en) | Electromagnetic agitation method for continuous casting of metal products having an elongate section | |
| CN114309510B (en) | Mechanically-stirred metal continuous casting process and mechanically-stirred device | |
| CN204672917U (en) | A kind of multi-mode sheet billet continuous casting electromagnetism flow control device and magnetic stirrer | |
| RU2248859C2 (en) | Equipment for supplying melt metal to continuous casting mold and method for using such equipment | |
| CN1872452A (en) | Tape dispensing equipment of conticaster | |
| CN112317707A (en) | Side spiral electromagnetic stirring device | |
| CN210023762U (en) | Immersion type water gap heating and rotating device | |
| CN107008884B (en) | Cooling mold and method for cooling steel ingot | |
| CN116240388A (en) | Electroslag remelting device, electroslag remelting method and transverse stirring magnetic field generating mechanism | |
| CN114932206B (en) | Independently controllable composite magnetic field device and method for controlling molten metal flow in crystallizer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |