A slab caster stopper, stopper apparatus and method thereof

Abstract

This invention provides a slab mold continuous casting blocking rod, blocking rod device, and method, relating to the field of metallurgical technology. It includes a blocking rod device and a blocking rod, based on a multi-parameter coupled mathematical model, to achieve momentum dissipation and flow field reconstruction of the upward flow stream of molten steel within the mold, significantly suppressing meniscus surface fluctuations and improving continuous casting stability. During continuous casting, by inserting the lower end of the blocking rod into the middle position between the mold pouring nozzle and the narrow-face mold copper plate, and positioning it below the meniscus, the turbulence amplitude of the poured molten steel within the mold can be effectively reduced, surface fluctuations can be decreased, inclusions and impurities in the continuously cast slab can be reduced, and the quality of the continuously cast slab and the stable and smooth operation of continuous casting can be improved. The mold continuous casting blocking rod device is simple and reliable. It solves the technical problems of existing technologies that use electromagnetic braking technology to suppress flow instability, which are difficult to adapt to and may have counterproductive effects if parameters are not properly controlled.

Description

Technical Field

[0001] This invention relates to the field of metallurgical technology, and in particular to a slab crystallizer continuous casting stop bar, a stop bar device, and a method thereof. Background Technology

[0002] In the continuous casting process of slabs, increasing the slab casting speed can effectively improve production efficiency and expand capacity. However, high-speed continuous casting of slabs will cause rapid flow of molten steel in the liquid surface area of ​​the crystallizer. The high-speed injection of molten steel will intensify the turbulence of the flow field in the crystallizer, and the surface velocity of molten steel in the meniscus area will increase significantly, which will lead to an abnormally large fluctuation in the liquid surface. This can easily cause slag entrapment in the continuously cast slab and increase the risk of steel leakage, which poses a severe challenge to smooth production and product quality control.

[0003] Modern steel plants commonly use electromagnetic braking technology in crystallizers to suppress flow instability. This technology constrains and regulates the high-speed flowing molten steel in the crystallizer by applying a controllable static magnetic field. However, electromagnetic braking technology suffers from complex equipment, high cost, high energy consumption, difficulty in process adaptation, and improper parameter control, which may lead to the opposite effect.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] One of the objectives of this invention is to provide a slab crystallizer continuous casting stop bar to solve the technical problem that the existing technology of using crystallizer electromagnetic braking technology to suppress flow instability is difficult to adapt to the process, and improper parameter control may cause the opposite effect.

[0006] A second objective of this invention is to provide the application of the above-mentioned slab mold continuous casting blocking rod in blocking fluctuations in the mold liquid level or in the preparation of a device for blocking fluctuations in the mold liquid level.

[0007] The third objective of this invention is to provide a slab crystallizer continuous casting blocking rod device.

[0008] The fourth objective of this invention is to provide a method for preventing fluctuations in the liquid surface of a crystallizer.

[0009] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: In a first aspect, the present invention provides a slab crystallizer continuous casting stop bar, the diameter of which is calculated according to the following formula: ; in, d b The diameter of the stop bar is in mm. W The width of the crystallizer (mm) T The thickness of the crystallizer (mm)v c The casting speed is (m / min). h The immersion depth of the sprue (mm) d b < T .

[0010] Furthermore, v c and T A positive relationship v c and W Inverse relationship W and T A positive relationship is formed.

[0011] Preferably, the W The range is 600~1800mm; T 150-300mm; v c The flow rate is 1.1~2.5 mm / min; h The diameter is 100~160mm.

[0012] Furthermore, the aforementioned d b The thickness is 50~110mm; Preferably, the blocking rod is made of aluminum-carbon material or aluminum-carbon zirconium material.

[0013] Secondly, the present invention provides the application of the above-mentioned slab mold continuous casting blocking rod in blocking the fluctuation of the mold liquid level or in the preparation of a device for blocking the fluctuation of the mold liquid level.

[0014] Thirdly, the present invention provides a slab crystallizer continuous casting blocking rod device, including a blocking rod device and a blocking rod; The blocking rod device includes a support, a large arm, a small arm, and a rod clamp connected in sequence; the rod clamp holds the blocking rod, and the blocking rod is the slab crystallizer continuous casting blocking rod mentioned above.

[0015] Furthermore, the top of the support is connected to the upper arm via a vertical rotating mechanism one; the forearm is connected to the upper arm via a vertical rotating mechanism two; and the rod clamp is fixedly connected to the free end of the forearm. Preferably, the vertical rotating mechanism is located between the support and the upper arm, and the vertical rotating mechanism is provided with a fixing mechanism. Preferably, the second vertical rotating mechanism is located between the forearm and the upper arm, and the second vertical rotating mechanism is provided with a second fixing mechanism.

[0016] Furthermore, the vertical rotating mechanism includes a kinematic pair that forms a relative oscillating motion through a pair of vertical shafts and sleeves; the fixing mechanism includes a set screw that is fitted into the kinematic pair. Preferably, the second vertical rotating mechanism includes a second kinematic pair that forms a relative swinging motion through a pair of vertical shafts and sleeves, and the second fixing mechanism includes a set screw that is fitted into the sleeve of the second kinematic pair; Preferably, the set screws in both the first and second fixing mechanisms are used to restrict the circumferential rotation of the shaft relative to the sleeve.

[0017] Furthermore, the opening and closing direction of the clamp is horizontal; Preferably, the blocking rod is arranged in a vertical direction; Preferably, the rod clamp is provided with an inner liner, which is a flexible flame retardant material.

[0018] Fourthly, the present invention provides a method for blocking fluctuations in the liquid level of a crystallizer, which uses the above-mentioned slab crystallizer continuous casting blocking rod device to block fluctuations in the liquid level of the crystallizer.

[0019] Furthermore, the method includes inserting the lower end of the stop bar into the middle position between the crystallizer pouring nozzle and the narrow-faced crystallizer copper plate using a stop bar device, wherein the vertical distance between the lower end of the stop bar and the meniscus is 100~160 mm.

[0020] The slab casting stopper provided by this invention, based on a multi-parameter coupled mathematical model, achieves momentum dissipation and flow field reconstruction of the upward flow of molten steel within the mold, significantly suppressing meniscus surface fluctuations and improving continuous casting stability. During continuous casting, by inserting the lower end of the stopper into the middle position between the mold pouring nozzle and the narrow-faced mold copper plate, and positioning it below the meniscus, the turbulence amplitude of the poured molten steel within the mold can be effectively reduced, surface fluctuations decreased, inclusions and impurities in the continuously cast slab reduced, and the quality of the continuously cast slab improved, along with the stable and smooth operation of continuous casting. The mold casting stopper device is simple and reliable. It solves the technical problems of existing technologies that use electromagnetic braking technology to suppress flow instability, which are difficult to adapt to and may lead to counterproductive effects if parameters are not properly controlled. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1This is a schematic diagram illustrating the usage state of the slab crystallizer continuous casting blocking rod device during continuous casting, as provided in an embodiment of the present invention.

[0023] Icons: 100 - Crystallizer; 101 - Inner arc copper plate of crystallizer; 102 - Outer arc copper plate of crystallizer; 103 - Narrow copper plate on the left side of crystallizer; 104 - Narrow copper plate on the right side of crystallizer; 200 - Gating nozzle; 300-blocking rod; 400-Blocking rod device; 401-Support; 402-Upright arm; 403-Left arm; 404-Bar clamp; 405-Vertical rotating mechanism one; 406-Vertical rotating mechanism two; 407-Fixing mechanism one; 408-Fixing mechanism two; 500-flow field. Detailed Implementation

[0024] Unless otherwise defined herein, the scientific and technical terms used in conjunction with this invention shall have the meanings commonly understood by one of ordinary skill in the art. The meaning and scope of terms shall be clear; however, in any case of potential ambiguity, the definitions provided herein shall prevail over any dictionary or foreign definitions. In this application, unless otherwise stated, the use of "or" means "and / or". Furthermore, the use of the term "comprising" and other forms is non-limiting.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] In the description of this invention, it should be noted that the terms "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] The terms "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This invention provides a slab crystallizer continuous casting stop bar, the diameter of which is calculated according to the following formula: ; in, d b The diameter of the stop bar is in mm. W The width of the crystallizer (mm) T The thickness of the crystallizer (mm) v c The casting speed is (m / min). h The immersion depth of the sprue (mm) d b < T .

[0031] The diameter of the slab mold continuous casting stop bar is determined based on a multi-parameter coupled mathematical model, which realizes momentum dissipation and flow field reconstruction of the molten steel backflow stream in the mold, significantly suppressing meniscus surface fluctuations and improving continuous casting stability. This solves the technical problems of existing technologies using electromagnetic braking to suppress flow instability, such as the difficulty in process adaptation and the potential for counterproductive effects due to improper parameter control, providing a new approach to suppressing surface fluctuations.

[0032] The obstruction diameter is determined by combining the formula mechanism and the physical characteristics of the continuous casting flow field, among which the four major variables affect... d b The influence exhibits a clear monotonic correlation characteristic, as detailed below: 1. Crystallizer width W — Positive correlation, playing a leading role.

[0033] Influence Pattern: W Increase d b A slight increase.

[0034] Physical Mechanism: The wider the crystallizer, the broader the lateral flow field coverage of the meniscus, and the longer the lateral diffusion distance of the high-speed backflow stream. To achieve effective interception across the entire width, the diameter of the blocking rod needs to be increased to enhance the coverage area and momentum dissipation capacity of the physical barrier. For example: W Increase from 900 mm to 1200 mm (other parameters remain unchanged). d b An increase of approximately 2.8%.

[0035] 2. Crystallizer thickness T —Positive correlation, exerting a secondary influence.

[0036] Influence Pattern: T Increase d b A slight increase.

[0037] Physical Mechanism: The thickness of the crystallizer determines the penetrating power of the molten steel jet. A greater thickness results in stronger kinetic energy of the jet impacting the narrow face at the nozzle side orifice, leading to a higher velocity in the rebounding backflow stream. Therefore, the diameter of the blocking rod needs to be appropriately increased to enhance the reduction effect on the high-energy backflow stream. For example: T From 180 mm to 220 mm, d b An increase of approximately 3.6%.

[0038] 3. Casting speed of billet v c —positive correlation Influence Pattern: v c When >1.1 m / min, v c The larger, d b The increase was substantial.

[0039] Physical Mechanism: Casting speed is the core determinant of molten steel flow rate. Increasing the casting speed directly increases the jet velocity and the upward flow rate. Initially, when the casting speed increases, the diameter of the stop rod needs to increase rapidly to match the momentum growth; when the casting speed is too high, the flow field tends to saturate, and a slower increase in diameter is sufficient to meet flow control requirements. For example: v c Increase from 1.6 m / min to 2.5 m / min, d b An increase of approximately 25%.

[0040] 4. Immersion depth of the sprue h —negative correlation Influence Pattern: h Increase d b Decrease.

[0041] Physical Mechanism: The deeper the immersion depth, the closer the jet core region is to the lower part of the crystallizer. The momentum of the molten steel flowing upwards after impacting the narrow face is significantly weakened due to energy dissipation over a long distance, reducing the intensity of the high-speed stream in the meniscus region. Therefore, the greater the immersion depth, the smaller the diameter of the blocking rod required to avoid excessive obstruction leading to insufficient flow at the meniscus. For example: h From 100 mm to 250 mm, d b It will decrease by approximately 30%.

[0042] In some specific implementation methods... v c and T A positive relationship v c and W Inverse relationship W and T A positive relationship is formed.

[0043] In some specific implementations, the W The range is 600~1800mm; T 150~300mm; v c The flow rate is 1.1~2.5 mm / min; h It is 100~160mm. In some specific embodiments, the... d b The diameter is 50~110mm.

[0044] in, W It can be, but is not limited to, 600mm, 650mm, 700mm, 900mm, 1000mm, 1050mm, 1100mm, 1150mm, 1200mm, 1250mm, 1350mm, 1500mm or 1800mm, or any value between 600 and 1800mm; T It can be, but is not limited to, 150mm, 180mm, 200mm, 210mm, 220mm, 230mm, 250mm or 300mm, or any value between 150 and 300mm; v c The speed can be, but is not limited to, 1.1 mm / min, 1.15 mm / min, 1.2 mm / min, 1.3 mm / min, 1.4 mm / min, 1.5 mm / min, 1.6 mm / min, 1.8 mm / min, 2.0 mm / min or 2.5 mm / min, or any value between 1.1 and 2.5 mm / min;h It can be, but is not limited to, 100mm, 105mm, 110mm, 115mm, 120mm, 130mm, 140mm, 150mm or 160mm, or any value between 100 and 160mm.

[0045] d b The value can be, but is not limited to, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, or 110mm, or any value between 50 and 110mm.

[0046] In some specific implementations, the diameter of the blocking rod follows the pattern shown in Table 1 (the blocking rod may not be exactly the same as the calculated value, and rounding is allowed).

[0047] Table 1

[0048] In some specific embodiments, the blocking rod is made of aluminum-carbon material or aluminum-carbon zirconium material.

[0049] According to another aspect of the invention, the above-described slab mold continuous casting blocking rod is also provided for use in blocking fluctuations in the mold liquid level or in the preparation of a device for blocking fluctuations in the mold liquid level.

[0050] According to another aspect of the present invention, a slab crystallizer continuous casting blocking rod device is also provided, including a blocking rod device 400 and a blocking rod 300; the blocking rod device 400 includes a bracket 401, a large arm 402, a small arm 403 and a rod clamp 404 connected in sequence; the rod clamp 404 clamps the blocking rod 300, and the blocking rod 300 is the above-mentioned slab crystallizer continuous casting blocking rod.

[0051] The blocking rod device 400 controls the lower end of the blocking rod 300 to be inserted into the middle position between the crystallizer pouring nozzle and the narrow-face crystallizer copper plate, and to be located below the meniscus, thereby suppressing the fluctuation of the liquid surface on the meniscus and improving the stability of continuous casting.

[0052] In some specific embodiments, the top of the support 401 is connected to the upper arm 402 via a vertical rotating mechanism 405; the lower arm 403 is connected to the upper arm 402 via a vertical rotating mechanism 406; and the rod clamp 404 is fixedly connected to the free end of the lower arm 403. In some specific embodiments, the vertical rotating mechanism 405 is located between the support 401 and the upper arm 402, and the vertical rotating mechanism 405 is provided with a fixing mechanism 407; in some specific embodiments, the vertical rotating mechanism 405 includes a kinematic pair that forms a relative left-right swing through a pair of vertical shafts and sleeves; the fixing mechanism 407 includes a set screw that is fitted into the sleeve of the kinematic pair.

[0053] In some specific embodiments, the second vertical rotating mechanism 406 is located between the forearm 403 and the upper arm 402, and a second fixing mechanism 408 is provided on the second vertical rotating mechanism 406. In some specific embodiments, the second vertical rotating mechanism 406 includes a second kinematic pair that forms a relative left-right swinging motion through a pair of vertical shafts and sleeves, and the second fixing mechanism 408 includes a set screw that fits into the sleeve of the second kinematic pair. In some specific embodiments, the set screws in fixing mechanism 1 407 and fixing mechanism 2 408 are used to restrict the circumferential rotation of the shaft relative to the sleeve.

[0054] In some specific embodiments, the opening and closing direction of the rod clamp 404 is horizontal; the blocking rod 300 is arranged in a vertical direction; the rod clamp 404 is provided with an inner liner, which is a flexible flame retardant material.

[0055] According to another aspect of the present invention, a method for preventing fluctuations in the liquid level of a crystallizer is also provided, wherein the above-described slab crystallizer continuous casting blocking rod device is used to prevent fluctuations in the liquid level of the crystallizer.

[0056] During continuous casting, by inserting the lower end of the blocking rod into the middle position between the pouring nozzle of the crystallizer and the copper plate of the narrow-faced crystallizer, and positioning it below the meniscus, the turbulence amplitude of the poured steel in the crystallizer can be effectively reduced, the liquid surface fluctuation can be reduced, the inclusions and impurities in the continuously cast billet can be reduced, and the quality of the continuously cast billet and the stable and smooth operation of continuous casting can be improved. The crystallizer continuous casting blocking rod device is simple and reliable.

[0057] In some specific embodiments, the lower end of the blocking rod 300 is inserted into the middle position between the crystallizer pouring nozzle and the narrow-faced crystallizer copper plate by means of the blocking rod device 400, and the vertical distance between the lower end face of the blocking rod 300 and the meniscus is 100~160 mm.

[0058] Specifically, before continuous casting begins, the space position of the rod clamp 404 is roughly set at 1 / 4 of the distance from the center of the crystallizer using the stop rod device 400. Then, the aluminum-carbon-zirconium stop rod 300 of the corresponding diameter is clamped onto the rod clamp 404. Then, the positions of the upper arm 402 and the lower arm 403 are precisely adjusted by the tightening and loosening fixing mechanism 1 407 and the fixing mechanism 2 408, and the vertical rotation mechanism 1 405 and the vertical rotation mechanism 2 406, respectively. The height of the bottom of the stop rod 300 is first fixed to the "0" reference position. At the same time, the position line to be lowered is drawn above the stop rod 300. Then, 5 minutes after the continuous casting starts, when the casting speed reaches more than 80% of the stable casting speed, the rod clamp 404 is manually loosened, allowing the position line on the stop rod 300 to be lowered directly into place, and the rod clamp 404 is used to firmly clamp and position the stop rod 300.

[0059] The present invention will be further illustrated by the following examples. Unless otherwise specified, the materials in the examples are prepared according to existing methods or purchased directly from the market.

[0060] Example 1 Combination Figure 1 This document describes the use of a slab crystallizer continuous casting blocking rod device during the continuous casting process. The slab crystallizer 100 includes an inner arc copper plate 101, an outer arc copper plate 102, a narrow left-side copper plate 103, and a narrow right-side copper plate 104. During molten steel pouring, a pouring nozzle 200 is inserted into the center of the crystallizer 100. Blocking rod devices 400 and blocking rods 300 are respectively installed on both sides of the crystallizer 100. The blocking rod device 400 includes a support 401 and a large arm 402. The forearm 403 and the bar clamp 404 are provided. The top of the support 401 is connected to the upper arm 402 via a vertical rotating mechanism 405. The forearm 403 is connected to the upper arm 402 via a vertical rotating mechanism 406. The bar clamp 404 is fixedly connected to the front end of the forearm 403 and clamps the blocking bar 300. A fixing mechanism 407 is provided on the vertical rotating mechanism 405, and a fixing mechanism 408 is provided on the vertical rotating mechanism 406.

[0061] Before continuously casting the 1350*200 cross-section billet, the space position of the rod clamp 404 is first roughly fixed at 1350 / 4≈337mm from the center of the crystallizer using the blocking rod device 400. Then, the aluminum-carbon-zirconium blocking rod 300 with a diameter of φ70mm is clamped onto the rod clamp 404. Then, the positions of the upper arm 402 and the lower arm 403 are precisely adjusted by the tightening and loosening fixing mechanism 1 407 and the fixing mechanism 2 408, and correspondingly by the vertical rotation mechanism 1 405 and the vertical rotation mechanism 2 406, so that the height of the bottom of the blocking rod 300 is first adjusted. Fix the stop bar to the "0" reference position, and draw the 200mm position line above the stop bar 300 to be lowered later. Then, after 5 minutes of continuous casting, when the casting speed reaches more than 80% of the stable casting speed of 1.15 m / min, manually loosen the bar clamp 404 so that the position line on the stop bar 300 is directly lowered into position. That is, adjust the bottom position of the stop bar 300 to 200mm from the upper end of the crystallizer (including 80mm from the meniscus to the upper end of the crystallizer + 120mm from the bottom of the stop bar to the meniscus). Secure the stop bar 300 with the bar clamp 404 to position it.

[0062] The above-mentioned use of a φ68mm diameter blocking rod 300 and the adjustment of the blocking rod device 400 to position the blocking rod 300 effectively reduces the turbulence amplitude of the molten steel in the crystallizer, reduces liquid surface fluctuation, reduces slag inclusions and impurities in the continuously cast billet, and effectively improves the quality of the continuously cast billet and the stable and smooth operation of continuous casting.

[0063] Example 2 The difference from Example 1 is that the continuous casting cross section is 1800*300 and the casting speed is 1.3 m / min.

[0064] The blocking rod 300 is made of aluminum-carbon alloy. First, the blocking rod device 400 positions the rod clamp 404 approximately 1800 / 4 = 450 mm to the left and right of the center of the crystallizer. Then, the φ80 mm diameter aluminum-carbon blocking rod 300 is clamped onto the rod clamp 404. Next, through the tightening and loosening mechanism 407 and the fixing mechanism 408, and correspondingly through the vertical rotation mechanism 405 and the vertical rotation mechanism 406, the positions of the upper arm 402 and the lower arm 403 are precisely adjusted to fix the height of the bottom of the blocking rod 300. Set the reference position to "0" and draw the 180mm position line above the stop bar 300 to be lowered later. Then, 5 minutes after the continuous casting starts, when the casting speed reaches more than 80% of the stable casting speed of 1.3 m / min, manually loosen the bar clamp 404 so that the position line on the stop bar 300 is directly lowered into position. That is, adjust the bottom position of the stop bar 300 to 180mm from the upper end of the crystallizer (including 80mm from the meniscus to the upper end of the crystallizer + 100mm from the bottom of the stop bar to the meniscus). Secure the bar clamp 404 to position the stop bar 300.

[0065] Similarly, by positioning the blocking rod 300 through the blocking rod device 400, the turbulence amplitude of the molten steel in the crystallizer is effectively reduced, the liquid surface fluctuation is reduced, the inclusions and impurities in the continuously cast billet are reduced, and the quality of the continuously cast billet and the stable operation of continuous casting are effectively improved.

[0066] Example 3 This embodiment systematically verifies the crystallizer width. W =600~1800 mm, crystallizer thickness T =150~300 mm, billet casting speed v c =1.1~2.5 m / min, sprue immersion depth h =100~160 mm, diameter of the stop bar d b Feasibility of (60~115 mm).

[0067] On a slab continuous casting machine (with an adjustable cross-section range of 600~1800×150~300 mm), single-furnace continuous casting tests were conducted for all 19 parameter combinations listed in Table 2.

[0068] The diameter of the blocking rod 300 is calculated according to the following formula: .

[0069] Table 2

[0070] 1. Select the material and size of the stop bar according to the thickness of the continuously cast billet and the casting speed.

[0071] 2. The blocking rod 300 is set in the vertical direction, and the opening and closing direction of the rod clamp 404 is horizontal; the center line of the rod body of the rod clamp 404 is W / 4 mm away from the center line of the crystallizer.

[0072] 3. According to h Adjust the bottom position of the stop bar 300 Adjust the bottom position of the stop rod 300 to A+B mm below the top opening of the crystallizer (where A is the distance from the top opening of the crystallizer meniscus, and B is the distance from the bottom of the stop rod 300 to the meniscus). Clamp the stop rod 300 of the corresponding diameter onto the rod clamp 404, and then precisely adjust the upper arm 402 and the lower arm 406 using the tightening and loosening fixing mechanism 407, the fixing mechanism 408, the vertical rotation mechanism 405, and the vertical rotation mechanism 406, respectively. For each part of arm 403, first fix the height of the bottom of the stop rod 300 to the "0" reference position. At the same time, draw the A+Bmm position line above the stop rod 300 to be lowered later. When the casting speed reaches more than 80% of the stable casting speed after 4-8 minutes of casting, manually loosen the rod clamp 404 so that the position line on the stop rod 300 is directly lowered into place, that is, adjust the bottom position of the stop rod 300 to A+Bmm from the upper end face of the crystallizer. Then clamp the rod clamp 404 firmly to position the stop rod 300.

[0073] Adjusting the bottom position of the blocking rod involves first positioning the bottom of the blocking rod at the "0" reference position before pouring. After pouring for 4 to 8 minutes and the pulling speed reaches 80% of the normal pulling speed, the lifting mechanism between the support 401 and the boom 402 is activated to insert the blocking rod downwards into place.

[0074] The results show that the mathematical model determined based on multi-parameter coupling... d b Compatible W / T / v c / h Under all operating conditions, without changing the main structure of the crystallizer 100 or adding electromagnetic equipment, active flow field 500 control is achieved. A relatively simple and low-cost control device is used to solve the problems of large turbulent flow of molten steel in the crystallizer 100, which easily leads to slag inclusion and steel leakage risks.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slab crystallizer continuous casting stop bar, characterized in that, The diameter of the blocking rod is calculated according to the following formula: ； in, d b The diameter of the blocking rod, W The width of the crystallizer. T For the thickness of the crystallizer, v c For billet casting speed, h The immersion depth of the water inlet. d b < T .

2. The slab crystallizer continuous casting stop bar according to claim 1, characterized in that, v c and T A positive relationship v c and W Inverse relationship W and T A positive relationship exists; Preferably, the W The range is 600~1800mm; T 150-300mm; v c The flow rate is 1.1~2.5 mm / min; h The diameter is 100~160mm.

3. The slab crystallizer continuous casting stop bar according to claim 1, characterized in that, The d b The thickness is 50~110mm; Preferably, the blocking rod is made of aluminum-carbon material or aluminum-carbon zirconium material.

4. The use of the slab mold continuous casting blocking rod according to any one of claims 1 to 3 in blocking fluctuations in the liquid level of the mold or in the preparation of a device for blocking fluctuations in the liquid level of the mold.

5. A slab crystallizer continuous casting blocking rod device, characterized in that, Includes a stop bar device (400) and a stop bar (300); The blocking rod device (400) includes a bracket (401), a large arm (402), a small arm (403), and a rod clamp (404) connected in sequence; the rod clamp (404) holds the blocking rod (300), and the blocking rod (300) is the slab crystallizer continuous casting blocking rod according to any one of claims 1 to 3.

6. The slab crystallizer continuous casting stopper bar device according to claim 5, characterized in that, The top of the bracket (401) is connected to the upper arm (402) via a vertical rotating mechanism one (405); the lower arm (403) is connected to the upper arm (402) via a vertical rotating mechanism two (406); the rod clamp (404) is fixedly connected to the free end of the lower arm (403); Preferably, the vertical rotating mechanism (405) is located between the support (401) and the upper arm (402), and the vertical rotating mechanism (405) is provided with a fixing mechanism (407). Preferably, the second vertical rotating mechanism (406) is located between the forearm (403) and the upper arm (402), and a second fixing mechanism (408) is provided on the second vertical rotating mechanism (406).

7. The slab crystallizer continuous casting blocking rod device according to claim 6, characterized in that, The vertical rotating mechanism (405) includes a kinematic pair that forms a relative swinging motion through a pair of vertical shafts and sleeves; the fixing mechanism (407) includes a set screw that fits into the sleeve of the kinematic pair. Preferably, the second vertical rotating mechanism (406) includes a second kinematic pair that forms a relative swinging motion through a pair of vertical shafts and sleeves, and the second fixing mechanism (408) includes a set screw that is fitted into the sleeve of the second kinematic pair; Preferably, the set screws in fixing mechanism one (407) and fixing mechanism two (408) are used to restrict the circumferential rotation of the shaft relative to the sleeve.

8. The slab crystallizer continuous casting blocking rod device according to claim 5, characterized in that, The opening and closing direction of the rod clamp (404) is horizontal; Preferably, the blocking rod (300) is arranged in a vertical direction; Preferably, the rod clamp (404) is provided with an inner liner, which is a flexible flame retardant material.

9. A method for preventing fluctuations in the liquid surface of a crystallizer, characterized in that, The slab crystallizer continuous casting blocking rod device according to any one of claims 5 to 8 is used to block the fluctuation of the liquid level in the crystallizer.

10. The method according to claim 9, characterized in that, This includes inserting the lower end of the stop bar (300) into the middle position between the crystallizer pouring nozzle and the narrow-faced crystallizer copper plate using a stop bar device (400), and the vertical distance between the lower end face of the stop bar (300) and the meniscus is 100~160 mm.

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