Slow cooling device for increasing cooling rate of steel plate

Abstract

The utility model relates to the technical field of steel plate cooling, in particular to a slow cooling device for improving the cooling rate of a steel plate, which comprises a slow cooling rack and a frame body positioned on one side of the slow cooling rack, a first axial flow fan unit, a second axial flow fan unit and a third axial flow fan unit are sequentially formed from bottom to top, the second axial flow fan unit is higher than the upper surface of the slow cooling rack, and an air blowing unit and a water spraying unit are arranged between the air outlet position of the second axial flow fan unit and the air outlet position of the third axial flow fan unit. And the air blowing unit and the water spraying unit form a convection atomization mechanism, so that water vapor sprayed by the water spraying unit is blown and mixed by the air blowing unit and then is blown to a steel plate of the slow cooling rack through the axial flow fan. The three layers of axial flow fans form three-dimensional convection, air blowing and water spraying of the middle layer act synergistically, the heat exchange efficiency is enhanced, rapid air flow on the surface of a steel plate is achieved, the air cooling rate of the steel plate of the cooling bed is increased, and the purpose of rapid cooling is achieved.

Description

Technical Field

[0001] This utility model relates to the field of steel plate cooling technology, and in particular to a slow cooling device for improving the cooling rate of steel plates. Background Technology

[0002] In the steel production process, the slow cooling stage of steel plates has a decisive impact on the quality of the final product. Early slow cooling of steel plates relied on natural cooling, which was slow and could not keep up with the pace of modern large-scale, high-efficiency production, resulting in long production cycles and severely restricting capacity expansion. Single forced cooling methods, such as simple axial flow fans, can accelerate airflow, but when faced with complex working conditions and steel plates of different specifications, it is difficult to guarantee the cooling speed and uniformity, which can easily cause uneven internal structure of the steel plate. Simple water spray cooling can quickly reduce the temperature, but due to excessive local temperature differences, it causes thermal stress concentration in the steel plate, resulting in frequent quality defects such as deformation and warping. At the same time, it also has the problems of water waste and water stains. Based on this, this application proposes a slow cooling device to improve the cooling rate of steel plates. Utility Model Content

[0003] To address the above technical problems, this utility model proposes a slow cooling device to improve the cooling rate of steel plates. A three-layer axial flow fan forms a three-dimensional convection, and the air blowing and water spraying in the middle layer work together to enhance heat exchange efficiency, realize rapid air flow on the surface of the steel plate, improve the air cooling rate of the steel plate on the cooling bed, and achieve the purpose of rapid cooling.

[0004] The slow cooling device for improving the cooling rate of steel plates in this solution includes a slow cooling platform and a frame located on one side of it. Three rows of axial flow fans are arranged in an array inside the frame. The three rows of axial flow fans form a first axial flow fan unit, a second axial flow fan unit, and a third axial flow fan unit from bottom to top. The second axial flow fan unit is higher than the upper surface of the slow cooling platform. Air blowing units and water spraying units are arranged layer by layer between the air outlets of the second and third axial flow fan units. The air blowing units and water spraying units form a convection atomization mechanism, so that the water sprayed from the water spraying unit is mixed with air by the air blowing unit and then blown onto the steel plate of the slow cooling platform by the axial flow fans.

[0005] Furthermore, the air blowing unit includes an air blowing pipe and a plurality of air blowing nozzles connected thereto, and the water spray unit includes a water spray pipe and a plurality of anti-clogging solid cone water spray nozzles connected thereto.

[0006] Furthermore, it also includes a slide rail connected to the frame, on which a baffle is slidably connected, so that the baffle blocks part of the working area of ​​the convection atomization mechanism on the slide rail.

[0007] Furthermore, the three rows of axial flow fans have an overall length of 33 meters and a height of 2.7 meters. Each row has 30 axial flow fans, with a vertical spacing of 0.885 meters between the upper and lower layers and a horizontal spacing of 1 meter between the axial flow fans.

[0008] Furthermore, the fan blades of the axial flow fan are made of aerospace-grade aluminum alloy, the air volume of the axial flow fan is 15000-20000m³ / h, the air pressure is 200-300Pa, and the motor power is 2-3.5kW.

[0009] Furthermore, the axial flow fan is tilted downwards at 15-20°.

[0010] Furthermore, the anti-clogging solid cone water spray nozzle has a working pressure of 0.2-0.5MPa, an atomized particle diameter of 80-120μm, and a nozzle water flow rate of 10-15L / min.

[0011] The beneficial effects of this utility model are as follows: The three-layer axial flow fan in the slow cooling device provided by this utility model forms a three-dimensional convection, and the air blowing and water spraying in the middle layer work together to enhance the heat exchange efficiency, realize the rapid air flow on the surface of the steel plate, improve the air cooling rate of the steel plate on the cooling bed, achieve the purpose of rapid cooling, shorten the cooling time of the steel plate by 40%-50%, effectively speed up the production rhythm, and ensure the performance and quality of the steel plate; the position of the baffle in the slow cooling device is adjustable, and the working area of ​​the cooling water vapor can be adjusted synchronously according to the size of the steel plate. Attached Figure Description

[0012] Figure 1 This is a front view of the slow cooling device in a specific embodiment of the present invention.

[0013] Figure 2 This is a side view of the slow cooling device in a specific embodiment of the present invention;

[0014] Figure 3 This is a three-dimensional structural diagram of the slow cooling device in a specific embodiment of this utility model;

[0015] Figure 4 This is a front view of the slow cooling device in another specific embodiment of the present invention;

[0016] Among them: 10, frame body; 21, first axial flow fan unit; 22, second axial flow fan unit; 23, third axial flow fan unit; 30, convection atomization mechanism; 31, air blowing unit; 32, water spray unit; 40, slow cooling platform; 50, steel plate; 61, slide rail frame; 62, baffle; 310, air blowing pipe; 320, water spray pipe. Detailed Implementation

[0017] like Figure 1 and Figure 3As shown, this embodiment discloses a slow cooling device for improving the cooling rate of steel plates, including a slow cooling platform 40 and a frame 10 located on one side thereon. The frame 10 has three rows of axial flow fans arranged in an array in a vertical plane. The three rows of axial flow fans form a first axial flow fan unit 21, a second axial flow fan unit 22 and a third axial flow fan unit 23 from bottom to top. The second axial flow fan unit 22 is higher than the upper surface of the slow cooling platform 40. An air blowing unit 31 and a water spraying unit 32 are arranged layer by layer between the air outlets of the second axial flow fan unit 22 and the third axial flow fan unit 23. The air blowing unit 31 and the water spraying unit 32 form a convection atomization mechanism 30, so that the water sprayed by the water spraying unit 32 is mixed with the air blown by the air blowing unit 31 and then blown by the axial flow fans onto the steel plate 50 of the slow cooling platform 40.

[0018] In this embodiment, the blades of the axial flow fan are made of aerospace-grade aluminum alloy. The airflow range of the axial flow fan is 15,000-20,000 m³ / h, the air pressure is 200-300 Pa, and the motor power is 2-3.5 kW. All axial flow fans are uniformly tilted downwards at 15-20° to enhance the airflow impact on the steel plate surface and improve the heat dissipation effect. The axial flow fans are 40° higher than the slow cooling platform to ensure an increased airflow rate on the upper surface of the steel plate, thereby achieving the purpose of accelerating the air cooling of the steel plate.

[0019] See Figure 2 In this embodiment, the air blowing unit 31 includes an air blowing pipe 310 and multiple air blowing nozzles connected thereto, and the water spray unit 32 includes a water spray pipe 320 and multiple anti-clogging solid cone water spray nozzles connected thereto. The anti-clogging solid cone water spray nozzles operate at a pressure of 0.2-0.5 MPa, with atomized particle diameter of 80-120 μm and a nozzle water flow rate of 10-15 L / min. This effectively reduces the outlet air temperature and has strong water temperature regulation capabilities, meeting the air flow temperature requirements in hot weather. Simultaneously, this application can be equipped with a dedicated booster pump (voltage 220V, pressure 15 MPa, flow rate 6-10 L) to increase water pressure, ensuring the coverage area of ​​the water spray and the uniformity of atomized particles, meeting the cooling needs of different areas of the steel plate, and avoiding uneven cooling due to insufficient water pressure.

[0020] In some other implementations, the three rows of axial flow fans are 33 meters long and 2.7 meters high, which meets the length requirements of the steel plate rolling mill and achieves full coverage of product specifications. Each row has 30 axial flow fans, with a vertical spacing of 0.885m and a horizontal spacing of 1m. This arrangement on one side of the slow cooling platform 40 ensures that the water film evenly covers the steel plate.

[0021] like Figure 4As shown, in other embodiments, the slow cooling device also includes a slide rail 61 connected to the front side of the frame 10. A baffle 62 is slidably connected to the slide rail 61, so that the baffle 62 blocks part of the working area of ​​the convection atomizing mechanism 30 on the slide rail 61. Specifically, when the steel plate 50 is placed on the slow cooling platform 40, the width / length of the steel plate is less than the working length of the three rows of axial flow fans. The movable baffle 62 is used to block part of the working area of ​​the convection atomizing mechanism 30, so that its effective working area matches the width / length of the steel plate, and to prevent excess water vapor from being blown towards the slow cooling platform 40.

[0022] In addition to the above embodiments, this utility model may have other implementation methods; all technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A slow cooling device for increasing the cooling rate of steel plates, comprising a slow cooling platform (40) and a frame (10) located on one side thereof, characterized in that, The frame (10) is provided with three rows of axial flow fans arranged in an array. The three rows of axial flow fans are arranged from bottom to top as a first axial flow fan unit (21), a second axial flow fan unit (22) and a third axial flow fan unit (23). The second axial flow fan unit (22) is higher than the upper surface of the slow cooling platform (40). Between the air outlets of the second axial flow fan unit (22) and the third axial flow fan unit (23), air blowing units (31) and water spraying units (32) are arranged layer by layer. The air blowing units (31) and water spraying units (32) constitute a convection atomization mechanism (30), so that the water sprayed by the water spraying unit (32) is mixed with the air by the air blowing unit (31) and then blown by the axial flow fans to the steel plate (50) of the slow cooling platform (40).

2. The slow cooling device according to claim 1, characterized in that, The air blowing unit (31) includes an air blowing pipe (310) and a plurality of air blowing nozzles connected thereto, and the water spray unit (32) includes a water spray pipe (320) and a plurality of anti-clogging solid cone water spray nozzles connected thereto.

3. The slow cooling device according to claim 1, characterized in that, It also includes a slide rail (61) connected to the frame (10), on which a baffle (62) is slidably connected, so that the baffle (62) blocks part of the working area of ​​the convection atomizing mechanism (30) on the slide rail (61).

4. The slow cooling device according to claim 1, characterized in that, The three rows of axial flow fans are 33 meters long and 2.7 meters high. Each row has 30 axial flow fans, with a vertical spacing of 0.885 meters between the upper and lower layers and a horizontal spacing of 1 meter.

5. The slow cooling device according to claim 1, characterized in that, The fan blades of the axial flow fan are made of aerospace-grade aluminum alloy. The air volume of the axial flow fan ranges from 15,000 to 20,000 m³ / h, the air pressure is 200 to 300 Pa, and the motor power is 2 to 3.5 kW.

6. The slow cooling device according to claim 1, characterized in that, The axial flow fan is tilted downwards at 15-20°.

7. The slow cooling device according to claim 2, characterized in that, The anti-clogging solid cone water spray nozzle has a working pressure of 0.2-0.5MPa, an atomized particle diameter of 80-120μm, and a nozzle water flow rate of 10-15L / min.

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