Special-shaped blank web water absorption device for special-shaped blank continuous casting machine

Abstract

The invention belongs to the technical field of special-shaped blank production, and relates to a special-shaped blank web water absorption device for a special-shaped blank continuous casting machine. The arrangement requirement of the water suction port area S suction of the water suction port (6) is as follows: S suction / Q water max is more than or equal to 20.0 and less than or equal to 50.0, S suction is the water suction port area, and the unit is mm2; q water max is the maximum cooling water flow of the inner arc of the special-shaped blank, and the unit is L / mi n; the arrangement requirement of the area S < suction > of the water suction port and the cross section area S < pipe > of the water suction pipeline is that the cross section area S < pipe > of the water suction pipeline is 1.2-2.0 times of the area S < suction > of the water suction port. The special-shaped blank web water absorption device for the special-shaped blank continuous casting machine is simple in structure, accumulated water at the position of an inner arc web of a special-shaped blank can be effectively absorbed in the continuous casting production process of the special-shaped blank, local supercooling of the special-shaped blank cannot be caused, the temperature on the cross section of the special-shaped blank tends to be uniform, crack sensitive steel has no crack defect, and the product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of profiled blank production, and more specifically, relates to a profiled blank web plate water absorption device for a profiled blank continuous casting machine. Background Art

[0002] Hot-rolled H-beam is an economical and efficient special-shaped steel with more optimized cross-sectional area distribution and more reasonable strength-to-weight ratio. It has the advantages of strong bending resistance in all directions, simple construction, cost saving and light structure weight. It is widely used in various building structures and mechanical equipment manufacturing. Hot-rolled H-beam rolling adopts square billets, rectangular billets and special-shaped billets. Among them, large H-beams mostly adopt special-shaped billets, which can reduce the number of rolling passes, have high production efficiency and low cost. The crystallizer of the special-shaped billet continuous casting machine is arranged in "Н" shape, and the inner arc web of the special-shaped billet is groove-shaped. During the continuous casting process, the secondary cooling water in the inner arc of the billet cannot flow out to both sides like square billets, rectangular billets and slabs, but flows downward along the direction of the billet and accumulates on the inner arc web, resulting in water accumulation on the inner arc web. Water accumulation on the inner arc web will bring many problems. First, the water accumulation will increase the cooling intensity of the inner arc web, resulting in local overcooling of the inner arc surface, making the overall cooling of the ingot uneven, with high stress and easy surface cracks. Second, the cooling water flowing down from the secondary cooling section will flow to the flame cutting machine, resulting in failure of smooth flame cutting. Therefore, the profiled billet continuous casting machine needs to take measures to remove the secondary cooling water from the inner arc web. At present, the commonly used method in the prior art is to install a water blower in the secondary cooling section, and blow compressed air onto the profiled billet surface to blow the cooling water off the inner arc web of the profiled billet. This method has the problem that the cooling water blown by the water blower will splash onto the flange of the profiled billet, resulting in overcooling of the profiled billet flange, which has a particularly large impact on the quality of the continuous casting billet of crack-sensitive steel. Since the high-temperature plasticity of crack-sensitive steel is low, cracks will occur in the overcooled parts of the flange.

[0003] The invention patent with the publication number of CN 101367118 B relates to a water-blowing device for cooling the second cooling section of continuous casting of a profiled blank, wherein the air delivery pipeline (1) coincides with the vertical symmetry plane (16) of the web and is parallel to the surface of the web (6) of the profiled blank; the air jet of the air jet nozzle (2) is directed toward the web indentation (4) on the inner arc side of the profiled blank (11). By adopting the above technical scheme, compressed air or other inert gas is sprayed to the water accumulation part of the web of the profiled blank through the air jet nozzle of the water blower, so as to reduce the amount of water accumulation and evenly distribute the accumulated water to the high-temperature part of the billet, so as to make the surface temperature distribution of the profiled blank more uniform, reduce the surface temperature recovery amplitude to below 80℃ / m, and reduce the lateral temperature difference of the web surface to below 200℃ / m; the quality of the profiled blank is greatly improved, and the incidence of surface cracks can be reduced to below 1%. At the same time, the device and its corresponding application method are simple and easy to use, and low in cost. This invention uses compressed air to blow away the water accumulated on the inner arc web of the profiled blank, which is different from the method of sucking away the water accumulated on the inner arc web of the profiled blank of the present invention.

[0004] The invention patent with publication number CN 104999046 B relates to a beam billet continuous casting machine and a secondary cooling water blowing method for beam billet continuous casting. By improving the position and water blowing method of the cooling water blower in the secondary cooling section of the beam billet continuous casting, the problem of uneven cooling of the billet caused by water accumulation in the inner arc of the beam billet is solved, and the quality defects of the billet are avoided. The continuous casting machine of the present invention comprises a ladle, a tundish, a crystallizer and a cooling chamber of fan-shaped sections I, II and III connected in sequence. The cooling chamber fan-shaped section II is equipped with more than two water blowers. The water volume of the crystallizer adopts weak cooling, the water volume of the inner and outer arcs is 2200L / min, and the water volume of the left and right sides is 1200L / min. The temperature difference is controlled at 4-5℃, non-sinusoidal vibration is adopted, double nozzle full protection casting is adopted, and intermediate cooling is adopted for secondary cooling. The superheat of molten steel is between 15 and 30℃, and the specific water volume of the secondary cooling zone is 0.8L / kg. This invention also utilizes compressed air to blow away the water accumulated on the inner arc web of the profiled blank, which is different from the method of sucking away the water accumulated on the inner arc web of the profiled blank of the present invention.

[0005] The utility model patent with the publication number CN 213729240 U relates to a device for cleaning water accumulated on the belly during the cooling process of the casting of a profiled blank. The device includes two sets of water blowers connected to pressure pumps, and a water absorber is arranged behind the two water blowers, which can greatly reduce the amount of water accumulated on the belly and evenly distribute the accumulated water to the high-temperature part of the billet, making the surface temperature distribution of the profiled blank more uniform, greatly improving the quality of the profiled blank, reducing the incidence of surface cracks to less than 1%, and eliminating the problem of belly depression. The invention uses a water blower to blow the water accumulated on the belly to the high-temperature part, and arranges a water absorber behind the water blower to achieve the purpose of reducing the water accumulated on the belly. The invention cannot completely remove the water accumulated on the belly, but can only greatly reduce it. In addition, the invention does not elaborate on how the water absorber absorbs water, which is different from the device and application method of the present invention. Summary of the invention

[0006] The technical problem to be solved by the present invention is: in view of the shortcomings of the prior art, a special-shaped blank belly plate water absorption device for a special-shaped blank continuous casting machine is provided, which has a simple structure and can effectively absorb the accumulated water at the inner arc belly plate position of the special-shaped blank during the continuous casting production process of the special-shaped blank, without causing local overcooling of the special-shaped blank, so that the temperature on the cross section of the special-shaped blank tends to be uniform, crack-sensitive steel has no crack defects, and the product quality is improved, thereby expanding the product application field and improving competitiveness.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0008] The present invention discloses a web water suction device for a profiled blank continuous casting machine, comprising a water suction nozzle 1, a conveying pipeline 2, and a fan 3. The water suction nozzle 1 comprises a V-shaped water suction nozzle outer cavity 4, a herringbone baffle 5 is arranged inside the water suction nozzle inner cavity 4, the water suction nozzle inner cavity 4 and the herringbone baffle 5 form two water suction ports 6 and two water suction pipelines 7, and the water suction port area S of the water suction port 6 is 1. 吸 The setting requirement is: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2 ;Q 水max is the maximum cooling water flow rate of the inner arc of the profiled blank, unit, L / min; the water inlet area S 吸 and the cross-sectional area of ​​the suction pipe S 管 The setting requirements are: the cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 吸 1.2 to 2.0 times of.

[0009] The water suction nozzle 1 further comprises a delivery pipe opening 8 , which is connected to the delivery pipeline 2 .

[0010] The profiled blank web plate water absorption device for the profiled blank continuous casting machine is arranged between the last supporting roller and the second last supporting roller in the inner arc at the end of the secondary cooling section of the profiled blank continuous casting machine.

[0011] The profile blank 9 includes a web 10 , a first flange 11 , and a second flange 12 .

[0012] When the water suction nozzle 1 is absorbing water, the distance between the water suction port 6 of the water suction nozzle 1 and the surface of the casting is controlled to be between 1 mm and 3 mm.

[0013] The angle between the water suction nozzle outer surface 13 of the water suction nozzle 1 and the surface of the casting blank is controlled to be 70° to 90°, and the water suction nozzle outer surface 13 includes a first water suction nozzle outer surface 14 and a second water suction nozzle outer surface 15 .

[0014] The distance or diameter between the first water suction nozzle outer surface 14 of the water suction nozzle inner cavity 4 and the first baffle assembly 16 of the herringbone baffle 5 is a structure that gradually increases from the water suction port 6 to the delivery pipe port 8; the distance or diameter between the second water suction nozzle outer surface 15 of the water suction nozzle inner cavity 4 and the second baffle assembly 17 of the herringbone baffle 5 is a structure that gradually increases from the water suction port 6 to the delivery pipe port 8.

[0015] It is characterized in that: the conditions for the maximum air volume and working air volume of the fan 3 are: 10.0≤Q 风 / Q 水 or Q 风max / Q 水max ≤25.0, where Q 风The air volume of the fan when it is working, in m 3 / h;Q 水 Q is the inner arc cooling water volume, unit: l / min, 风max is the maximum air volume of the fan, in m 3 / h;Q 水max It is the maximum cooling water volume of the inner arc, in L / min.

[0016] The rated power of the motor of the fan 3 meets the maximum air volume required for the maximum cooling water of the inner arc web of the profile blank: N = Q 风max ÷(3600×η1×η2×1000)×P 风 ×K, where η1 is the fan efficiency, K is the motor capacity reserve factor; N is the fan motor rated power, unit KW; Q 风max is the maximum fan air volume, in m 3 / h; P 风 It is the operating wind pressure of the fan, in Pa.

[0017] The wind pressure of the fan 3 is controlled in the range of 2000Pa to 4000Pa.

[0018] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0019] The web water suction device for the profiled blank continuous casting machine of the present invention is structured by separately manufacturing a water suction nozzle, a conveying pipeline, and a fan (high-speed centrifugal fan), and then assembling and connecting the above components, and then arranging them at corresponding positions of the profiled blank continuous casting machine. The water suction nozzle is connected to the fan through a conveying pipeline, and effective sealing of the connection part is ensured. The cooling water sucked out by the fan is discharged through the drain port, and can be discharged into the secondary cooling chamber and then returned to the water system of the continuous casting machine system. In order to ensure a good water suction effect, the structure of the water suction nozzle, the distance between the water suction nozzle and the casting blank, the parameters of the high-speed fan, and the diameter of the pipeline are related. Specifically, (1) Control the size of the suction port of the water suction nozzle. There is a herringbone baffle inside the outer cavity of the water suction nozzle, which divides the inner part of the outer cavity of the water suction nozzle into two water suction ports distributed on both sides. Since there is iron oxide on the surface of the inner arc web of the profiled blank, water and iron oxide are sucked in by the water suction nozzle during the water suction process. Therefore, the water suction port must be of a certain size, otherwise it will be blocked. The thickness is generally not less than 20mm. However, if the water suction port is too large, the water suction port area will be too large, and a larger centrifugal fan will be required, resulting in increased energy consumption. At the same time, the water suction port area S 吸 It is also necessary to select an appropriate area value in combination with the maximum water volume of the inner arc secondary cooling. For this purpose, a special setting is made: the water inlet area S 吸 Need to meet: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2;Q 水max is the maximum cooling water flow rate of the inner arc of the profiled blank, in l / min. (2) Control the diameter of the water suction pipe. In order to ensure that the water suction nozzle 1 generates a large suction force and smoothly sucks away the cooling water accumulated in the inner arc of the profiled blank, the cross-sectional area of ​​the water suction pipe S 管 Should be larger than the water inlet area S 吸 Therefore, the cross-sectional area of ​​the pipe S 管 S is the water inlet area 吸 1.2 to 2.0 times of the suction force of the water suction nozzle to avoid the influence of excessive pipe resistance. In this way, the water absorption effect is improved and the product quality is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents and symbols in the drawings of this specification:

[0021] Figure 1 It is a structural schematic diagram of the web plate water absorption device of the profiled blank used in the profiled blank continuous casting machine of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a water suction nozzle of a web plate water suction device for a profiled blank continuous casting machine according to the present invention;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of a profiled blank of the profiled blank web plate water absorption device for the profiled blank continuous casting machine according to the present invention;

[0024] The marks in the attached drawings are respectively: 1. water suction nozzle; 2. conveying pipe; 3. fan; 4. inner cavity of water suction nozzle; 5. herringbone baffle; 6. water suction port; 7. water suction pipe; 8. conveying pipe port; 9. special-shaped blank; 10. web; 11. first flange; 12. second flange; 13. outer surface of water suction nozzle; 14. outer surface of first water suction nozzle; 15. outer surface of second water suction nozzle; 16. first baffle assembly; 17. second baffle assembly; 18. drain outlet; 19. top of flange; 20. R angle; 21. intersection of R angle and web. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0026] As attached Figure 1 -Attached Figure 3As shown, the present invention is a web water suction device for a profiled blank continuous casting machine, comprising a water suction nozzle 1, a conveying pipeline 2, and a fan 3. The water suction nozzle 1 comprises a V-shaped water suction nozzle outer cavity 4, a herringbone baffle 5 is arranged inside the water suction nozzle inner cavity 4, the water suction nozzle inner cavity 4 and the herringbone baffle 5 form two water suction ports 6 and two water suction pipelines 7, and the water suction port area S of the water suction port 6 is 吸 The setting requirement is: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2 ;Q 水max is the maximum cooling water flow rate of the inner arc of the profiled blank, unit, L / min; the water inlet area S 吸 and the cross-sectional area of ​​the suction pipe S 管 The setting requirements are: the cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 吸 The above structure, in view of the deficiencies in the prior art, proposes an improved technical solution. When setting up the structure, a water suction nozzle 1, a conveying pipeline 2, and a fan 3 (a high-speed centrifugal fan) are separately manufactured, and then the above components are assembled and connected, and then arranged at the corresponding position of the special-shaped blank continuous casting machine, as shown in the attached Figure 1 As shown. The water suction nozzle 1 is connected to the fan 3 through the conveying pipe 2, and the effective sealing of the connection part is ensured. The cooling water sucked out by the fan is discharged through the drain port 18, which can be discharged into the secondary cooling room and then returned to the water system of the continuous casting machine system. In order to ensure a good water suction effect, the structure of the water suction nozzle, the distance between the water suction nozzle and the billet, the parameters of the high-speed fan and the pipe diameter are related. Specifically, (1) Control the size of the suction port of the water suction nozzle 4. There is a herringbone baffle inside the outer cavity of the water suction nozzle, which divides the inner part of the outer cavity of the water suction nozzle into two water suction ports, distributed on both sides, as shown in the attached Figure 2 As shown. Since there is iron oxide on the surface of the inner arc web of the profiled blank, water and iron oxide are sucked in by the water suction nozzle during the water suction process. Therefore, the water suction port must be of a certain size, otherwise it will be blocked. The thickness is generally not less than 20mm; but if the water suction port is too large, the water suction port area will be too large, and a larger centrifugal fan will be required, resulting in increased energy consumption; at the same time, the water suction port area S 吸 It is also necessary to select an appropriate area value in combination with the maximum water volume of the inner arc secondary cooling. For this purpose, a special setting is made: the water inlet area S 吸 Need to meet: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2 ;Q 水maxis the maximum cooling water flow rate of the inner arc of the profiled blank, in l / min. (2) Control the diameter of the water suction pipe. In order to ensure that the water suction nozzle 1 generates a large suction force and smoothly sucks away the cooling water accumulated in the inner arc of the profiled blank 9, the cross-sectional area of ​​the water suction pipe S 管 Should be larger than the water inlet area S 吸 Therefore, the cross-sectional area of ​​the pipe S 管 S is the water inlet area 吸 1.2 to 2.0 times of the suction force of the water suction nozzle is avoided due to excessive pipe resistance. In this way, the water absorption effect is effectively improved and the product processing quality is guaranteed. The profiled blank web water absorption device for the profiled blank continuous casting machine of the present invention has a simple structure. During the profiled blank continuous casting production process, it can effectively absorb the accumulated water at the inner arc web position of the profiled blank without causing local overcooling of the profiled blank, so that the temperature on the cross section of the profiled blank tends to be uniform, crack-sensitive steel has no crack defects, and the product quality is improved.

[0027] The water suction nozzle 1 also includes a delivery pipe opening 8, which is connected to the delivery pipeline 2. In the above structure, the delivery pipe opening 8 is used for the sucked water to flow out and enter the delivery pipeline for discharge.

[0028] The web water suction device for the profiled blank continuous casting machine is arranged between the penultimate support roller and the penultimate support roller at the end of the secondary cooling section of the profiled blank continuous casting machine. The above structure sets the installation position of the water suction nozzle. In order to ensure that all the cooling water at the inner arc web position of the profiled blank sprayed in the secondary cooling section can be sucked away, the water suction nozzle is installed between the penultimate support roller and the penultimate support roller at the end of the secondary cooling section of the profiled blank continuous casting machine. The profiled blank 9 includes a web 10, a first flange 11, and a second flange 12.

[0029] When the water suction nozzle 1 is absorbing water, the distance between the water suction port 6 of the water suction nozzle 1 and the surface of the casting blank is controlled to be between 1mm and 3mm. The above structure controls the distance between the water suction nozzle and the web surface of the profiled blank (casting blank). The distance between the water suction nozzle and the web surface directly affects the water suction effect. The closer the water suction nozzle is to the web surface, the better the water suction effect. However, the installation accuracy of the water suction nozzle is high, and it is easy to be scratched by the deformed profiled blank tail. Therefore, it is controlled between 1 and 3mm to ensure the best water suction effect and effectively prevent the water suction nozzle from being scratched by the deformed profiled blank tail.

[0030] The angle between the outer surface 13 of the water suction nozzle 1 and the surface of the casting is controlled to be 70°~90°, and the outer surface 13 of the water suction nozzle includes a first outer surface 14 and a second outer surface 15. The above structure controls the angle between the water suction nozzle and the surface of the web. Since the special-shaped billet continuous casting machine is an arc-shaped continuous casting machine, the continuous casting billet at the end of the secondary cooling section is not vertical but has a certain angle. Therefore, a good water absorption effect can be obtained by keeping the water suction nozzle horizontal or perpendicular to the surface of the continuous casting billet. Therefore, in order to adapt to the characteristics of the continuous casting machine, the angle between the water suction nozzle and the surface of the casting billet is controlled to be 70°~90° considering the space structure between the penultimate and second support rollers of the fan-shaped segment.

[0031] The distance or diameter between the first water suction nozzle outer surface 14 of the water suction nozzle inner cavity 4 and the first baffle assembly 16 of the herringbone baffle 5 is a structure that gradually increases from the water suction port 6 to the delivery pipe port 8; the distance or diameter between the second water suction nozzle outer surface 15 of the water suction nozzle inner cavity 4 and the second baffle assembly 17 of the herringbone baffle 5 is a structure that gradually increases from the water suction port 6 to the delivery pipe port 8. The above structure specifically sets the structure of the water suction nozzle. In order to ensure that the water suction nozzle 1 generates a large suction force and smoothly sucks away the cooling water accumulated in the inner arc of the profiled blank 9, the cross-sectional area S of the water suction pipe is 管 Should be larger than the water inlet area S 吸 . Pipe cross-sectional area S 管 S is the water inlet area 吸 1.2 to 2.0 times of the suction force of the water suction nozzle to avoid being affected by excessive pipe resistance.

[0032] The conditions for the maximum air volume and working air volume of the fan 3 are: 10.0≤Q 风 / Q 水 or Q 风max / Q 水max ≤25.0, where Q 风 The air volume of the fan when it is working, in m 3 / h;Q 水 Q is the inner arc cooling water volume, unit: l / min, 风max is the maximum air volume of the fan, in m 3 / h;Q 水max The maximum cooling water volume of the inner arc, in L / min. The above structure controls the fan air volume. The fan air volume is determined according to the cooling water flow of the inner arc of the profiled blank. The maximum fan air volume is determined according to the maximum cooling water flow of the inner arc. The operating air volume is determined according to the actual cooling water flow of the inner arc. The fan motor adopts variable frequency control to control the air volume by controlling the motor frequency. The maximum fan air volume and the working air volume meet 10.0≤Q 风 / Q 水 or Q 风max / Q 水max ≤25.0. Where Q 风 The air volume of the fan when it is working, in m3 / h;Q 水 Q is the inner arc cooling water volume, unit: l / min, 风max is the maximum air volume of the fan, in m 3 / h;Q 水max It is the maximum cooling water volume of the inner arc, in l / min.

[0033] The rated power of the motor of the fan 3 meets the maximum air volume required for the maximum cooling water of the inner arc web of the profile blank: N = Q 风max ÷(3600×η1×η2×1000)×P 风 ×K, where η1 is the fan efficiency, ranging from 0.719 to 0.8; η2 is the mechanical transmission efficiency, the fan adopts coupling transmission, and the value is 0.98; K is the motor capacity reserve coefficient, which is related to the motor power size, 2-5KW takes a value of 1.2, and above 5KW takes a value of 1.15; N is the rated power of the fan motor, unit KW; Q 风max is the maximum fan air volume, in m 3 / h; P 风 is the fan operating wind pressure, in Pa. The above structure controls the rated power of the fan motor. The motor rated power must meet the maximum air volume required for the maximum cooling water of the inner arc web of the profiled blank, N = Q 风max ÷(3600×η1×η2×1000)×P 风 ×K, where η1 is the fan efficiency, which can be 0.719 to 0.8; η2 is the mechanical transmission efficiency, and the high-speed centrifugal fan adopts coupling transmission, and the value is 0.98; K is the motor capacity reserve coefficient, which is related to the motor power size, and the value is 1.2 for 2-5KW and 1.15 for more than 5KW; N is the rated power of the fan motor, in KW; Q 风max is the maximum fan air volume, in m 3 / h; P 风 It is the fan operating wind pressure, in Pa. During the production process, the operating fan air volume is determined according to the actual inner arc cooling water flow, and the air volume is controlled by controlling the motor frequency.

[0034] The wind pressure of the fan 3 is controlled within the range of 2000Pa to 4000Pa. In the above structure, the fan is a high-speed centrifugal fan. The high-speed centrifugal fan is the core component of the water suction device and the power source of the suction force. The high-speed motor drives the impeller to rotate, generating centrifugal force, and then generating suction at the fan suction port. The suction force is determined by the wind volume and wind pressure. The greater the wind volume, the greater the suction force; the greater the wind pressure, the greater the suction force. In order to generate sufficient suction to absorb the water accumulated on the inner arc belly of the profiled blank, a higher wind pressure is adopted and controlled within the range of 2000 to 4000Pa.

[0035] The profiled blank web water suction device for the profiled blank continuous casting machine of the present invention sucks away the cooling water of the inner arc web of the profiled blank through a high-speed centrifugal fan, a pipeline and a water suction nozzle installed in the secondary cooling section, so as to avoid uneven cooling on the cross section of the profiled blank caused by water accumulation, solve the problem that the cooling water is splashed to the flange by the current water blower, causing overcooling of the part, and avoid quality defects of the cast blank. The specific beneficial effect is: a high-speed centrifugal fan is used to suck away the water accumulated on the inner arc web of the profiled blank. The fan motor is frequency-controlled, and the fan air volume is controlled by adjusting the motor speed. According to the characteristics that the cooling water accumulated on the inner arc web of the profiled blank in the second cooling section is distributed on both sides of the straight section, a water suction nozzle with a herringbone baffle inside is used, and air suction ports are formed on both sides of the water suction nozzle, which can effectively absorb the water accumulated on the inner arc web of the profiled blank. The water suction nozzle is installed between the penultimate roller and the second roller in the secondary cooling section, which is convenient for positioning and can effectively protect the water suction nozzle from being scratched. The water suction port area, pipeline cross-sectional area, fan motor power and fan air volume must meet a certain relationship to obtain a better water suction effect and ensure that all the water accumulated on the inner arc web of the profiled blank can be sucked away. Profiled blanks with different cross-sections of the same continuous casting machine share the pipeline and fan. The water suction nozzle is installed in the secondary cooling section. When the cross-section of the continuous casting blank is changed, it is replaced together with the cooling section. It can be used after connecting the water suction nozzle to the fan pipeline, which is easy to operate. Application of different profiled blank cross-sections. Different profiled blank cross-sections use different water suction nozzles, which are shared by the pipeline and fan. When the profiled blank continuous casting machine changes the cross-section, the pipeline is connected to the water suction nozzle of the corresponding cross-section, and the fan motor frequency is adjusted to meet the fan air volume required by the corresponding profiled blank cross-section.

[0036] Embodiment 1 of the web plate water absorption device for a profiled blank continuous casting machine of the present invention:

[0037] The cross section of the profiled blank with the specification of H×B×T is 750×450×120, Q450NQR1 weathering steel is produced, the secondary cooling water volume is 0.6l / kg, the pulling speed is 0.75m / min, and the water absorption device is implemented according to the following embodiment:

[0038] (1) The water suction nozzle is installed on the penultimate (roller No. 32) and second (roller No. 31) of the inner arc web of the profiled blank.

[0039] Between the support rollers; the water suction nozzle is 2.1mm away from the surface of the casting; the angle between the water suction nozzle and the casting surface is controlled to be 75°. (2) The size of the lower mouth of the water suction nozzle is 365×30mm, of which there are two water suction nozzles, distributed on both sides, with an area of ​​3000mm 2 , S 吸 6000mm 2 The maximum cooling water flow rate Q of the inner arc of this section 内max 240.0l / min, S 吸 / Q 水max =25.0.

[0040] (3) The pipe diameter is 100 mm and the cross-sectional area is S 管 7850mm 2 , S 管 / S 吸 =1.31.

[0041] (4) The centrifugal fan pressure is 3000Pa and the motor power is 4KW. The maximum air volume of the fan is Q 风max It can be obtained by calculating the motor power and wind pressure, Q 风max =N×3600×η1×η2×1000÷P 风 ÷

[0042] K=2940m 3 / h (η1 is 0.75, η1 is 0.98, K is 1.2), the ratio of the maximum air volume of the fan to the maximum cooling water volume of the inner arc is Q 风max / Q 水max =12.3.

[0043] (5) During normal production, the inner arc cooling water flow rate is 159.5 / min, the fan motor frequency is set to 45Hz, and the fan air volume is 2550m 3 / h,Q 风 / Q 水 =16.0.

[0044] (6) After using the water suction device to remove the water accumulated on the inner arc web of the profiled blank, all the water accumulated on the inner arc is sucked away and there is no water accumulation. Before the water suction device works, a water blower is used to remove the water accumulated on the web and an infrared thermometer is used to measure the temperature at the outlet of the secondary cooling section. Figure 3 The temperature at each temperature measuring point is marked. The temperature at the top of the flange is the lowest, 695°C. The temperature at the web 1 where it intersects with the R angle is the second lowest, 798°C. The temperature at the R angle 2 is the highest, 908°C. The maximum temperature difference is 213°C. Stop using the existing water blower and use a water suction device to remove the water accumulated on the web. Figure 3 The temperature at each temperature measuring point is marked. The temperature at the top of the flange is the lowest, 814°C, followed by the temperature at the web 1 where it intersects the R angle, 876°C, and the temperature at the R angle 2 is the highest, 911°C. The maximum temperature difference is 97°C. The temperature difference of the inner arc surface of the profiled billet is reduced, and the surface temperature tends to be uniform. The surface temperature of the billet tends to be uniform. There are serious transverse cracks on the top and inner side of the inner arc flange of the billet without the water absorption device, and there are no transverse cracks on the inner side of the flange of the billet with the water absorption device.

[0047] Embodiment 2 of the web plate water absorption device for a profiled blank continuous casting machine of the present invention:

[0048] 500*300*120 profiled blank section produces EH36 steel, secondary cooling water volume is 0.65l / kg, pulling speed is 0.98m / min, and the water absorption device is implemented according to the following embodiment:

[0049] (1) The water suction nozzle is installed between the penultimate (roller No. 32) and second (roller No. 31) support rollers of the inner arc web of the profiled billet; the water suction nozzle is 1.9 mm away from the surface of the billet; the angle between the water suction nozzle and the surface of the billet is controlled to be 78°.

[0050] (2) The size of the lower mouth of the water suction nozzle is 205×30mm. There are two water suction ports, distributed on both sides, with an area of ​​2250mm 2 , S 吸 4500mm 2 The maximum cooling water flow rate Q of the inner arc of this section 内max 125.0l / min, S 吸 / Q 水max =36.0.

[0051] (3) The pipe diameter is 100 mm and the cross-sectional area is S 管 7850mm 2 , S 管 / S 吸 =1.74.

[0052] (4) The centrifugal fan pressure is 3000Pa and the motor power is 4KW. The maximum air volume of the fan is Q 风max It can be obtained by calculating the motor power and wind pressure, Q 风max =N×3600×η1×η2×1000÷P 风

[0053] ÷K=2940m 3 / h (η1 is 0.75, η1 is 0.98, K is 1.2), the ratio of the maximum air volume of the fan to the maximum cooling water volume of the inner arc is Q 风max / Q 水max =23.5.

[0054] (5) During normal production, the inner arc cooling water flow rate is 106.7 / min, and the fan motor frequency is set to 35Hz.

[0055] Fan air volume 2000m 3 / h,Q 风 / Q 水 =18.7.

[0056] After using the water suction device to remove the water accumulated on the inner arc web, all the water accumulated on the inner arc of the profiled blank was sucked away, and there was no water accumulation. Before the water suction device works, a water blower is used to remove the water accumulated on the web, and an infrared thermometer is used to measure the temperature at the outlet of the secondary cooling section. Figure 3The temperature at each temperature measuring point is marked. The temperature at the top of the flange is the lowest, 725°C. The temperature at the web 1 where it meets the R angle is the second lowest, 743°C. The temperature at the R angle 2 is the highest, 947°C. The maximum temperature difference is 222°C. Stop using the existing water blower and use a water suction device to remove the water accumulated on the web. Figure 3 The temperature at each temperature measuring point is marked. The temperature at the top of the flange is the lowest, 836°C, followed by the temperature at the web 1 where it intersects with the R angle, 894°C, and the temperature at the R angle 2 is the highest, 927°C. The maximum temperature difference is 91°C. The temperature difference of the inner arc surface of the profiled billet is reduced, and the surface temperature tends to be uniform. The surface temperature of the billet tends to be uniform. There are longitudinal cracks at the intersection of the inner arc web and the R angle of the billet without the water absorption device, and there are no longitudinal cracks at the intersection of the inner arc web and the R angle of the billet with the water absorption device.

[0057] The web water suction device for the profiled blank continuous casting machine of the present invention is structured by separately manufacturing a water suction nozzle 1, a conveying pipe 2, and a fan 3 (high-speed centrifugal fan), and then assembling and connecting the above components, and then arranging them at corresponding positions of the profiled blank continuous casting machine. The water suction nozzle 1 is connected to the fan 3 through the conveying pipe 2, and the effective sealing of the connection part is ensured. The cooling water sucked out by the fan is discharged through the drain port 18, and can be discharged into the secondary cooling chamber and then returned to the water system of the continuous casting machine system. In order to ensure a good water suction effect, the structure of the water suction nozzle, the distance between the water suction nozzle and the casting blank, the parameters of the high-speed fan, and the diameter of the pipe are related. Specifically, (1) the size of the suction port of the water suction nozzle 4 is controlled. There is a herringbone baffle inside the outer cavity of the water suction nozzle, which divides the inner part of the outer cavity of the water suction nozzle into two water suction ports distributed on both sides. Since there is iron oxide on the surface of the inner arc web of the profiled blank, water and iron oxide are sucked in by the water suction nozzle during the water suction process. Therefore, the water suction port must be of a certain size, otherwise it will be blocked. The thickness is generally not less than 20mm. However, if the water suction port is too large, the water suction port area will be too large, and a larger centrifugal fan will be required, resulting in increased energy consumption. At the same time, the water suction port area S 吸 It is also necessary to select an appropriate area value in combination with the maximum water volume of the inner arc secondary cooling. For this purpose, a special setting is made: the water inlet area S 吸 Need to meet: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2 ;Q 水max is the maximum cooling water flow rate of the inner arc of the profiled blank, in l / min. (2) Control the diameter of the water suction pipe. In order to ensure that the water suction nozzle 1 generates a large suction force and smoothly sucks away the cooling water accumulated in the inner arc of the profiled blank 9, the cross-sectional area of ​​the water suction pipe S 管 Should be larger than the water inlet area S 吸 Therefore, the cross-sectional area of ​​the pipe S 管 S is the water inlet area 吸1.2 to 2.0 times of the suction force of the water suction nozzle to avoid the influence of excessive pipe resistance. In this way, the water absorption effect is improved and the product quality is guaranteed.

[0058] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A web plate water absorption device for a profiled blank continuous casting machine, characterized in that: The invention comprises a water suction nozzle (1), a conveying pipeline (2), and a fan (3). The water suction nozzle (1) comprises a V-shaped water suction nozzle outer cavity (4). A herringbone baffle (5) is arranged inside the water suction nozzle inner cavity (4). The water suction nozzle inner cavity (4) and the herringbone baffle (5) form two water suction ports (6) and two water suction pipelines (7). The water suction port (6) has a water suction port area S 吸 The setting requirement is: 20.0≤S 吸 / Q 水max ≤50.0, where S 吸 is the water inlet area, unit: mm 2 ; Q 水max is the maximum cooling water flow rate of the inner arc of the profiled blank, unit, L / min; the water inlet area S 吸 and the cross-sectional area of ​​the suction pipe S 管 The setting requirements are: the cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 吸 1.2 to 2.0 times of.

2. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1, characterized in that: The water suction nozzle (1) further comprises a delivery pipe opening (8), and the delivery pipe opening (8) is connected to the delivery pipeline (2).

3. The web plate water absorption device for a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The profiled blank web plate water absorption device for the profiled blank continuous casting machine is arranged between the last supporting roller and the second last supporting roller in the inner arc at the end of the secondary cooling section of the profiled blank continuous casting machine.

4. The web plate water absorption device for a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The profiled blank (9) comprises a web (10), a first flange (11) and a second flange (12).

5. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: When the water suction nozzle (1) is absorbing water, the distance between the water suction port (6) of the water suction nozzle (1) and the surface of the casting is controlled to be between 1 mm and 3 mm.

6. The web plate water absorption device for a profiled blank for a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The angle between the water suction nozzle outer surface (13) of the water suction nozzle (1) and the surface of the casting blank is controlled to be 70° to 90°, and the water suction nozzle outer surface (13) includes a first water suction nozzle outer surface (14) and a second water suction nozzle outer surface (15).

7. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The distance or diameter between the first water suction nozzle outer surface (14) of the water suction nozzle inner cavity (4) and the first baffle assembly (16) of the herringbone baffle (5) is a structure that gradually increases from the water suction port (6) to the delivery pipe port (8); the distance or diameter between the second water suction nozzle outer surface (15) of the water suction nozzle inner cavity (4) and the second baffle assembly (17) of the herringbone baffle (5) is a structure that gradually increases from the water suction port (6) to the delivery pipe port (8).

8. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The conditions for the maximum air volume and working air volume of the fan (3) are: 10.0≤Q 风 / Q 水 or Q 风max / Q 水max ≤25.0, where Q 风 The air volume of the fan when it is working, in m 3 / h;Q 水 Q is the inner arc cooling water volume, unit: l / min, 风max is the maximum air volume of the fan, in m 3 / h;Q 水max It is the maximum cooling water volume of the inner arc, in L / min.

9. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The rated power of the motor of the fan (3) satisfies the maximum air volume required for the maximum cooling water of the inner arc web of the profiled blank (9): N=Q 风max ÷(3600×η1×η2×1000)×P 风 ×K, where η1 is the fan efficiency, K is the motor capacity reserve factor, and N is the fan motor rated power, in KW; Q 风max is the maximum fan air volume, in m 3 / h; P 风 It is the operating wind pressure of the fan, in Pa.

10. The web plate water absorption device for a profiled blank used in a profiled blank continuous casting machine according to claim 1 or 2, characterized in that: The wind pressure of the fan (3) is controlled within the range of 2000Pa to 4000Pa.

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