A water absorption device for the web of a beam blank used in a beam blank continuous casting machine

Abstract

The present invention belongs to the technical field of profiled blank production, and is a profiled blank web water suction device for a profiled blank continuous casting machine. 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 The beam blank web water absorption device for a beam blank continuous casting machine of the present invention has a simple structure and can effectively absorb water accumulated on the inner arc web of the beam blank during the beam blank continuous casting process without causing local overcooling of the beam blank. This ensures that the temperature across the cross section of the beam blank is uniform, eliminates crack defects in crack-sensitive steel, and improves product quality.

Description

Technical Field

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

[0002] Hot-rolled H-beams are economical, high-efficiency, special-shaped steel products with optimized cross-sectional area distribution and a more reasonable strength-to-weight ratio. They offer strong bending resistance in all directions, simple construction, cost savings, and lightweight structures. They are widely used in various building structures and mechanical equipment. Hot-rolled H-beams are produced using square, rectangular, and beam billets, with beam billets being the most common choice for large H-beams. This reduces the number of rolling passes, resulting in high production efficiency and low costs. The mold of a beam billet continuous casting machine is arranged in an "H" shape, with the inner arc web of the beam billet being grooved. During the continuous casting process, secondary cooling water cannot flow outwards from the inner arc of the billet, as with square, rectangular, and slab billets. Instead, it flows downward along the billet, accumulating on the inner arc web and causing water accumulation there. Water accumulation in the inner arc web will cause many problems. First, the accumulated water 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 generation of surface cracks. Second, the cooling water flowing down from the secondary cooling section will flow to the flame cutting machine, making it impossible to flame cut smoothly. Therefore, the continuous casting machine for profiled billets 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 surface of the profiled billet to blow the cooling water away from 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 flange of the profiled billet, 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 publication number CN 101367118 B relates to a water-blowing device for cooling the second cooling section of continuous casting of a profiled blank. The air delivery pipe (1) thereof coincides with the vertical symmetry plane (16) of the web and is parallel to the surface of the profiled blank web (6); 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 solution, compressed air or other inert gas is blown to the water accumulation area of ​​the profiled blank web through the water-blowing nozzle, the amount of water accumulation is reduced and the accumulated water is evenly distributed to the high-temperature part of the billet, which can make the surface temperature distribution of the profiled blank more uniform, reduce the surface temperature recovery amplitude to below 80°C / m, and reduce the transverse temperature difference of the web surface to below 200°C / m; the quality of the profiled blank is greatly improved, and the incidence rate of surface cracks can be reduced to below 1%. At the same time, the device and its corresponding application method are simple, 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 in the present invention.

[0004] The invention patent with publication number CN 104999046 B relates to a continuous casting machine for beam billets and a secondary cooling and water blowing method for continuous casting of beam billets. By improving the position and water blowing method of the cooling water blower in the secondary cooling section of the continuous casting of beam billets, the problem of uneven cooling of the billets caused by water accumulation in the inner arc of the billets is solved, and the occurrence of quality defects of the billets is avoided. The continuous casting machine of the present invention includes a ladle, a tundish, a crystallizer and a cooling chamber of fan-shaped sections I, II and III connected in sequence. The fan-shaped section II of the cooling chamber 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 on the left and right sides is 1200L / min. The temperature difference is controlled at 4-5°C, non-sinusoidal vibration is adopted, double-nozzle full-protection casting is adopted, and intermediate cooling is adopted for secondary cooling. The superheat of the molten steel is between 15 and 30°C, and the 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 the present invention of sucking away the water accumulated on the inner arc web of the profiled blank.

[0005] The utility model patent, publication number CN 213729240 U, ​​relates to a device for cleaning water from the web during the cooling process of a profiled blank casting. The device comprises two water blowers, each connected to a pressure pump, and a water aspirator positioned behind the two water blowers. This significantly reduces the amount of water accumulated on the web and evenly distributes the accumulated water to the hot areas of the billet, resulting in a more uniform surface temperature distribution on the profiled blank. This significantly improves the quality of the profiled blank, reduces the incidence of surface cracks to below 1%, and eliminates the problem of web sag. This invention utilizes water blowers to blow accumulated water from the web to the hot areas and positions a water aspirator behind the blowers to reduce the amount of water accumulated on the web. However, this invention does not completely remove the accumulated water from the web, only significantly reducing it. Furthermore, this invention does not elaborate on how the water aspirator absorbs water, which differs 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 existing technology, a special-shaped blank web 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 web 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 product quality is improved, thereby expanding the application field of the product and improving competitiveness.

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

[0008] The present invention is a web water suction device for a beam blank continuous casting machine, comprising a water suction nozzle 1, a conveying pipe 2, and a fan 3. The water suction nozzle 1 comprises a V-shaped water suction nozzle inner 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 pipes 7, and the water suction port area S of the water suction port 6 is 1 / 4 of the water suction port 6. 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 maximum cross-sectional area of ​​the suction pipe S 管 The setting requirements are: the maximum 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 includes a delivery pipe opening 8 , which is connected to the delivery pipeline 2 .

[0010] The beam blank web water absorption device for the beam 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 beam 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 outer surface 14 of the first water suction nozzle 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 outer surface 15 of the second water suction nozzle 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] The characteristic is that the conditions of the maximum air volume and working air volume of the fan 3 are: 10.0≤Q 风 / Q Water or Q Wind max / Q water max ≤25.0, where Qwind is the air volume when the fan is working, unit: m3 / h; Qwater is the amount of inner arc cooling water, unit is l / min, Q 风max 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 satisfies 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, unit is m 3 / h; P 风 The fan operating wind pressure, unit is 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 designed to separately manufacture a water suction nozzle, a conveying pipe, and a fan (high-speed centrifugal fan) during structural setting. The above components are then assembled and connected, and then arranged at corresponding positions of the profiled blank continuous casting machine. The water suction nozzle is connected to the fan through a conveying pipe, 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 pipe are related. Specifically, (1) the size of the water suction nozzle suction port is controlled. There is a herringbone baffle inside the inner cavity of the water suction nozzle, which divides the inner cavity of the water suction nozzle into two water suction ports, which are distributed on both sides. Since there is iron oxide on the surface of the inner arc web of the profiled blank, both water and iron oxide are sucked into 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 size 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 Must 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, unit, l / min. (2) Control the diameter of the water suction pipe. In order to ensure that the 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 maximum 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 is the water inlet area S 吸 1.2 to 2.0 times of the suction force of the 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 This is a schematic structural diagram of the web water absorption device for a beam blank continuous casting machine according to the present invention;

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

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

[0024] The marks in the accompanying drawings are: 1. Water suction nozzle; 2. Delivery pipe; 3. Fan; 4. Inner cavity of water suction nozzle; 5. Herringbone baffle; 6. Water suction port; 7. Water suction pipe; 8. Delivery 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. Drainage outlet; 19. Top of flange; 20. R angle; 21. Junction between R angle and web. DETAILED DESCRIPTION

[0025] The following describes the embodiments with reference to the accompanying drawings to further explain in detail the specific embodiments of the present invention, such as the shapes, structures, mutual positions and connection relationships between the various components involved, the functions and working principles of the various components.

[0026] As attached Figure 1 -Attached Figure 3 As shown, the present invention is a web water suction device for a beam blank continuous casting machine, comprising a water suction nozzle 1, a conveying pipe 2, and a fan 3. The water suction nozzle 1 comprises a V-shaped water suction nozzle inner 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 pipes 7, and the water suction port area S of the water suction port 6 is 1 / 4.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 maximum 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 shortcomings of the existing technology, proposes an improved technical solution. When setting up the structure, the water suction nozzle 1, the conveying pipe 2, and the fan 3 (high-speed centrifugal fan) are made separately, and then the above components are combined and connected, and then arranged at the corresponding position of the special-shaped blank continuous casting machine, as shown in the attached figure. 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) the size of the suction port of the water suction nozzle 4 is controlled. There is a herringbone baffle inside the inner cavity of the water suction nozzle, which divides the inner 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, both water and iron oxide are sucked into the water suction nozzle during the water suction process. Therefore, the water suction port must be of a certain size, otherwise it will cause blockage. The thickness is generally not less than 20mm. However, if the water suction port size is too large, the water suction port area will be too large, requiring a larger centrifugal fan, 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 Must 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 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 maximum cross-sectional area of ​​the water suction pipe S 管 Should be larger than the water inlet area S 吸 Therefore, the maximum cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 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 web water absorption device for the beam blank continuous casting machine of the present invention has a simple structure. During the beam blank continuous casting production process, it can effectively absorb the accumulated water at the inner arc web position of the beam blank without causing local overcooling of the beam blank, so that the temperature on the cross section of the beam blank tends to be uniform, crack-sensitive steel has no crack defects, and the product quality is improved.

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

[0028] The aforementioned beam blank web water suction device for a beam blank continuous casting machine is installed between the penultimate and penultimate support rollers at the end of the secondary cooling section of the beam blank continuous casting machine. The aforementioned structure provides a location for the water suction nozzle. To ensure that all cooling water sprayed on the inner arc web of the beam blank in the secondary cooling section is completely removed, the water suction nozzle is installed between the penultimate and penultimate support rollers at the end of the secondary cooling section of the beam blank continuous casting machine. The beam blank 9 comprises 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 cast billet is controlled to be between 1 mm and 3 mm. The above structure controls the distance between the water suction nozzle and the web surface of the profiled billet (cast billet). 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 water suction nozzle requires high installation precision and is easily scratched by deformed profiled billet tails. Therefore, the distance is controlled between 1 and 3 mm to ensure the best water suction effect and effectively prevent the water suction nozzle from being scratched by deformed profiled billet tails.

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

[0031] The distance or diameter between the outer surface 14 of the first water suction nozzle 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 outer surface 15 of the second water suction nozzle 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 absorbs the cooling water accumulated in the inner arc of the special-shaped blank 9, the maximum cross-sectional area S of the water suction pipe is 1. 管 Should be larger than the water inlet area S 吸 The maximum cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 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 when the fan is working, unit is m 3 / h;Q 水 Q is the inner arc cooling water volume, unit is l / min, 风max The maximum air volume of the fan, in m 3 / h;Q 水max The maximum cooling water flow rate 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 rate of the inner arc of the profiled blank. The maximum fan air volume is determined according to the maximum cooling water flow rate of the inner arc. The operating air volume is determined according to the actual cooling water flow rate of the inner arc. The fan motor adopts variable frequency control, and the air volume is controlled by controlling the motor frequency. The maximum fan air volume and the operating air volume meet 10.0≤Q 风 / Q 水 or Q 风max / Q 水max ≤25.0. Where Q 风 The air volume when the fan is working, unit is m 3 / h;Q 水 Q is the inner arc cooling water volume, unit is l / min, 风max 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 satisfies 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, and the fan adopts a coupling transmission, with a value of 0.98; K is the motor capacity reserve factor, which is related to the motor power size, with a value of 1.2 for 2-5KW and 1.15 for above 5KW; N is the rated power of the fan motor, in KW; Q 风max is the maximum fan air volume, unit is m 3 / h; P 风 The above structure controls the rated power of the fan motor. The rated power of the motor must meet 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)×Pwind×K, where η1 is the fan efficiency, which can be 0.719 to 0.8; η2 is the mechanical transmission efficiency, which is 0.98 for high-speed centrifugal fans using coupling transmission; K is the motor capacity reserve factor, which is related to the motor power size, with a value of 1.2 for 2-5KW and 1.15 for 5KW and above; N is the rated power of the fan motor, in KW; Q 风ma x is the maximum fan air volume, unit is m 3 / h; P 风 The fan operating pressure is in Pa. During the production process, the fan air volume is determined based on the actual inner arc cooling water flow rate, 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, a high-speed centrifugal fan is selected as the 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, which in turn generates suction at the fan suction port. The suction force is determined by the air volume and air pressure. The greater the air volume, the greater the suction force; the greater the air pressure, the greater the suction force. In order to generate sufficient suction to absorb the water accumulated on the inner arc web of the profile, a higher air pressure is adopted, controlled within the range of 2000 to 4000Pa.

[0035] The beam blank web water suction device for a beam blank continuous casting machine disclosed herein utilizes a high-speed centrifugal fan, a pipeline, and a water suction nozzle installed in the secondary cooling section to remove cooling water from the inner arc web of the beam blank, thereby preventing uneven cooling across the cross-section of the beam blank caused by water accumulation. This solves the problem of cooling water splashing onto the flange by current water blowers, resulting in overcooling of that area, and prevents quality defects in the cast blank. Specifically, the device utilizes a high-speed centrifugal fan to remove water accumulated on the inner arc web of the beam blank. The fan motor is frequency-controlled, and the fan air volume is controlled by adjusting the motor speed. Based on the characteristic that water accumulated on the inner arc web of the beam blank in the secondary cooling section is distributed on both sides of the straight section, a water suction nozzle with an internal herringbone baffle is used, forming air intakes on both sides of the nozzle, effectively removing water accumulated on the inner arc web of the beam blank. The nozzle is installed between the penultimate and second rollers in the secondary cooling section, facilitating positioning and effectively protecting the nozzle from scratches. The water suction port area, the maximum cross-sectional area of ​​the water suction pipe, the fan motor power and the 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 in the same continuous casting machine share the same pipe 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 along with the cooling section. It can be used after connecting the water suction nozzle to the fan pipe, which is easy to operate. Application of different profiled blank cross-sections. Different profiled blank cross-sections use different water suction nozzles, and the pipe and fan are shared. When the profiled blank continuous casting machine changes the cross-section, the pipe 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 water absorption device for a beam blank continuous casting machine of the present invention:

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

[0038] (1) The water suction nozzle is installed between the first (roller No. 32) and second (roller No. 31) support rollers on the inner arc web of the profiled blank; the water suction nozzle is 2.1 mm away from the surface of the billet; the angle between the water suction nozzle and the billet surface is controlled to be 75°.

[0039] (2) The size of the lower mouth of the water suction nozzle is 365×30mm. There are two water suction ports, 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 maximum cross-sectional area of ​​the suction pipe is S 管 7850mm 2 , S 管 / S 吸 =1.31.

[0041] (4) The centrifugal fan has a wind pressure of 3000Pa and a motor power of 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 ÷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.

[0042] (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.

[0043] (6) After using the water suction device to remove the water accumulated on the inner arc web of the special-shaped blank, all the water accumulated on the inner arc is sucked away and there is no water. 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 second cooling section. Figure 3 The temperature at each measuring point is marked. The lowest temperature is 695℃ at the top of the flange, followed by 798℃ at the web where it meets the R angle, and the highest temperature is 908℃ at the R angle. The maximum temperature difference is 213℃. Stop using the existing water blower and use the water suction device to remove the water accumulated on the web. At the outlet of the secondary cooling section, Figure 3 The temperatures at the indicated measuring points are lowest at 814°C at the flange tip, followed by 876°C at the web where it meets the rounded corner, and highest at 911°C at the rounded corner. The maximum temperature difference is 97°C. The temperature difference across the inner arc surface of the beam billet is decreasing, and the surface temperature is becoming more uniform. The surface temperature of the billet is becoming more uniform. Severe transverse cracks are observed on the tip and inner side of the inner arc flange of the billet without a water suction device. The inner flange of the billet with a water suction device has no transverse cracks.

[0044] Embodiment 2 of the web water absorption device for a beam blank continuous casting machine of the present invention:

[0045] The cross section of 500*300*120 profiled blank is used to produce EH36 steel. The secondary cooling water volume is 0.65 l / kg, the casting speed is 0.98 m / min, and the water absorption device is implemented according to the following embodiment:

[0046] (1) The water suction nozzle is installed between the first (roller No. 32) and second (roller No. 31) support rollers of the inner arc web of the special-shaped 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 billet surface is controlled to be 78°.

[0047] (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.

[0048] (3) The pipe diameter is 100 mm, and the maximum cross-sectional area of ​​the suction pipe is S 管 7850mm 2 , S 管 / S 吸 =1.74.

[0049] (4) The centrifugal fan has a wind pressure of 3000Pa and a motor power of 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 ÷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.

[0050] (5) During normal production, the inner arc cooling water flow rate is 106.7 / min, the fan motor frequency is set to 35Hz, and the fan air volume is 2000m 3 / h,Q 风 / Q 水 =18.7.

[0051] 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 is sucked away and there is no water. 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 measuring point is marked. The lowest temperature is 725℃ at the top of the flange, followed by 743℃ at the web where it meets the R angle, and the highest temperature is 947℃ at the R angle. The maximum temperature difference is 222℃. Stop using the existing water blower and use the water suction device to remove the water accumulated on the web. At the outlet of the secondary cooling section, Figure 3The temperatures at the indicated measuring points were lowest at 836°C at the flange tip, followed by 894°C at the web where it meets the rounded corner, and highest at 927°C at the rounded corner. The maximum temperature difference was 91°C. The temperature difference across the inner arc surface of the profiled blank decreased, and the surface temperature became more uniform. The surface temperature of the ingot became more uniform. In the ingot without the water suction device, longitudinal cracks were observed at the intersection of the inner arc web and the rounded corner. In the ingot with the water suction device, no longitudinal cracks were observed at this intersection.

[0052] The web water suction device for the profiled blank continuous casting machine of the present invention is designed to separately manufacture a water suction nozzle 1, a delivery pipe 2, and a fan 3 (high-speed centrifugal fan) during structural setting. The above components are then assembled and connected, and then arranged at corresponding positions of the profiled blank continuous casting machine. The water suction nozzle 1 is connected to the fan 3 through the delivery 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 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 inner cavity of the water suction nozzle, which divides the inner cavity of the water suction nozzle into two water suction ports, which are distributed on both sides. Since there is iron oxide on the surface of the inner arc web of the profiled blank, both water and iron oxide are sucked into 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 size 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 Must 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 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 maximum cross-sectional area of ​​the water suction pipe S 管 Should be larger than the water inlet area S 吸 Therefore, the maximum cross-sectional area of ​​the suction pipe S 管 is the water inlet area S 吸 1.2 to 2.0 times of the suction force of the 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.

[0053] 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 scope of protection of the present invention.

Claims

1. A web water absorption device for a beam blank continuous casting machine, characterized in that: The invention comprises a water suction nozzle (1), a conveying pipe (2), and a fan (3). The water suction nozzle (1) comprises a V-shaped water suction nozzle inner 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 pipes (7). 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 special-shaped blank, unit, L / min; the distance between the outer surface (14) of the first water suction nozzle 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 between the outer surface (15) of the second water suction nozzle 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).

2. The web plate water absorption device for a beam 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 beam blank continuous casting machine according to claim 1 or 2, characterized in that: The beam blank web water absorption device for the beam 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 beam blank continuous casting machine.

4. The web plate water absorption device for a beam 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 beam 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 blank is controlled to be between 1 mm and 3 mm.

6. The web plate water absorption device for a beam 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 beam 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 when the fan is working, unit is m 3 / h;Q 水 Q is the inner arc cooling water volume, unit is l / min, 风max 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.

8. The web plate water absorption device for a beam 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, η2 is the mechanical transmission efficiency, K is the motor capacity reserve coefficient, and N is the fan motor rated power, in KW; Q 风max is the maximum fan air volume, unit is m 3 / h; P 风 The fan operating wind pressure, unit is Pa.

9. The web plate water absorption device for a beam 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~4000Pa.

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