Cooling and sealing device for rapid cooling section of continuous annealing line annealing furnace

Abstract

The utility model provides a cooling and sealing device for a rapid cooling section of a continuous annealing furnace, which comprises two sealing plate groups and a locking mechanism, the two sealing plate groups are respectively arranged outside an upper sealing roller group and a lower sealing roller group of the rapid cooling section, each sealing plate group comprises two stainless steel plates, and the stainless steel plates are connected with the locking mechanism. The two stainless steel plates are symmetrically arranged in the furnace body in a hinged mode, a steel passing gap is reserved between the two stainless steel plates, and the steel passing gap and strip steel passing gaps formed by the upper sealing roller set and the lower sealing roller set are located on the same horizontal plane. The two ends of the locking mechanism are fixed to the two stainless steel plates respectively and located at the upper end and the lower end of the steel passing gap. Fireproof cotton is arranged on the periphery of the steel passing gap, and the steel passing gap in the fireproof cotton is in clearance fit with the strip steel.

Description

Technical Field

[0001] This utility model belongs to the technical field of continuous annealing furnace equipment, and relates to a cooling and sealing device for a continuous annealing line annealing furnace, especially a cooling and sealing device for the rapid cooling section of a continuous annealing line annealing furnace. Background Technology

[0002] A continuous annealing production line annealing furnace is a heat treatment equipment used in metal processing. It is mainly used to continuously heat, hold, and cool metal materials to improve their plasticity and toughness, making them easier to process and shape, reducing internal stress and structural inhomogeneity, optimizing grain structure and chemical composition, and improving product stability and reliability.

[0003] The temperature of the rapid cooling section in the annealing furnace is generally controlled at 440-480℃. Rapid cooling is achieved by blowing a mixture of 4% hydrogen and 96% nitrogen. Nitrogen is an inert gas that prevents strip oxidation, while hydrogen is a reducing gas that effectively removes oxides, reduces impurities, and improves material properties. Furthermore, hydrogen's high thermal conductivity and low viscosity give it high cooling efficiency. Currently, in the production of duplex steel (ferrite + martensite), the rapid cooling section temperature is required to be maintained at 340-380℃. This temperature is conducive to the formation of specific microstructures. Simply increasing the flow rate of the mixed gas for cooling would cause strip vibration, resulting in scratches. Therefore, the efficient cooling properties of hydrogen can be utilized to achieve rapid cooling by increasing the hydrogen concentration to 8%-10%.

[0004] However, the sealing rollers at the inlet and outlet of the rapid cooling section have a problem with poor sealing performance, allowing injected hydrogen to diffuse into other areas of the furnace and failing to achieve the desired rapid cooling effect with high hydrogen content. This cannot meet the technical requirements of steel grades that require lower temperatures in the rapid cooling section, thus affecting production efficiency and the company's development of new steel grades. Utility Model Content

[0005] The purpose of this invention is to provide a cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line, so as to solve the technical problem in the prior art that the inlet and outlet of the rapid cooling section cannot achieve rapid cooling of high hydrogen due to poor sealing effect.

[0006] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0007] A cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line includes a sealing plate assembly and a locking mechanism. Two sets of sealing plates are respectively disposed outside the upper and lower sealing roller assemblies of the rapid cooling section. Each sealing plate assembly includes two stainless steel plates, which are symmetrically hinged within the furnace body. A steel-passing gap is left between the two stainless steel plates. This steel-passing gap is on the same horizontal plane as the gaps formed by the upper and lower sealing roller assemblies for passing through the strip steel. The locking mechanism is detachably fixed at both ends of the two stainless steel plates, located at the upper and lower ends of the steel-passing gap.

[0008] Fireproof cotton is provided around the steel strip gap, and the steel strip gap inside the fireproof cotton forms a clearance fit with the steel strip.

[0009] The width of the steel passage gap is 5-10mm.

[0010] The stainless steel plates are hinged to the furnace body at opposite ends.

[0011] The beneficial effects of this utility model are as follows: By providing a cooling and sealing device for the rapid cooling section of a continuous annealing furnace, this utility model can effectively improve the sealing performance of the rapid cooling section while ensuring the passage of strip steel, making it a relatively closed space. This ensures that the high-hydrogen gas blown in stays in this section and does not diffuse to other areas, thereby allowing the temperature of the rapid cooling section to reach a lower limit, thus expanding the range of steel grades that the furnace can cool, and meeting the needs of steel grade development under different cooling temperature conditions.

[0012] Furthermore, the technical solution provided by this utility model uses a hinge to hinge the stainless steel plate to the furnace body and a locking mechanism to detachably fix it to the two stainless steel plates. This not only effectively seals the rapid cooling section during operation, but also allows the stainless steel plates to be quickly opened when the furnace area needs maintenance, making it convenient for workers to enter the furnace body to inspect the furnace body and furnace rollers.

[0013] The technical solution provided by this utility model effectively improves the sealing performance of the rapid cooling section furnace body by utilizing a simple structure, thereby reducing its lower temperature limit. It can not only effectively cool the strip steel, but also meet the needs of steel grade development under different cooling temperature conditions. It is suitable for promotion and application in the rapid cooling section of annealing furnaces in continuous annealing lines. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of the technical solution of this utility model applied in the rapid cooling section of the annealing furnace in a continuous annealing line;

[0015] Figure 2 This is a simplified top view of the main structure of this utility model;

[0016] Figure 3 This is a simplified front view of the main structure of this utility model.

[0017] The markings in the diagram are as follows: 1. Furnace body, 2. Locking mechanism, 3. Stainless steel plate, 4. Steel passage gap, 5. Fireproof cotton, 6. Hinge, 7. Upper sealing roller group, 8. Lower sealing roller group, 9. Turning roller, 10. Strip steel. Detailed Implementation

[0018] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model is provided below with reference to the accompanying drawings.

[0019] like Figures 1 to 3 As shown, this utility model provides a cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line. It includes a sealing plate assembly and a locking mechanism 2. Two sealing plate assemblies are respectively hinged to the furnace body 1 outside the upper sealing roller assembly 7 and the lower sealing roller assembly 8 of the rapid cooling section. This creates a relatively sealed space within the rapid cooling section where the upper and lower sealing roller assemblies 8 and the guiding roller 9 are located. Each sealing plate assembly includes two stainless steel plates 3, symmetrically arranged within the furnace body 1. The plates are hinged to the furnace body 1 at opposite ends via hinges 6. A steel strip 10 passes through the two stainless steel plates 3 through a gap 4. This steel strip 10 passes through the gaps formed by the upper sealing roller assembly 7 and the lower sealing roller assembly 8, respectively, on the same horizontal plane.

[0020] To prevent the stainless steel plate 3 from scratching the strip 10 when it passes through the steel passage gap 4, fireproof cotton 5 is provided around the steel passage gap 4 in this embodiment. The width of the steel passage gap 4 inside the fireproof cotton 5 is 5-10mm, and it fits the strip 10 with a clearance. The two ends of the locking mechanism 2 are detachably fixed to the two stainless steel plates 3, located at the upper and lower ends of the steel passage gap 4, to ensure the closure of the stainless steel plates 3 during operation, thereby forming a relatively sealed space in the rapid cooling section. The locking mechanism 2 can be a locking pin, a hook lock, or other common locking methods, and is not specifically limited in this embodiment. During maintenance, the locking mechanism 2 can be removed to flip the two stainless steel plates 3 and fold them to a position parallel to the furnace wall, thus facilitating workers to enter the furnace body 1 for maintenance.

[0021] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line, characterized in that: It includes a sealing plate assembly and a locking mechanism (2). There are two sets of sealing plate assemblies, which are respectively set outside the upper sealing roller assembly (7) and the lower sealing roller assembly (8) in the fast cooling section. Each set of sealing plate assemblies includes two stainless steel plates (3). The two stainless steel plates (3) are symmetrically hinged and set inside the furnace body (1). There is a steel passage gap (4) between the two stainless steel plates (3). The steel passage gap (4) is on the same horizontal plane as the gaps formed by the upper sealing roller assembly (7) and the lower sealing roller assembly (8) for passing through the strip steel (10). The two ends of the locking mechanism (2) are detachably fixed on the two stainless steel plates (3) and located at the upper and lower ends of the steel passage gap (4).

2. The cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line according to claim 1, characterized in that: Fireproof cotton (5) is provided around the steel strip gap (4), and the steel strip gap (4) inside the fireproof cotton (5) forms a clearance fit with the steel strip (10).

3. The cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line according to claim 1, characterized in that: The width of the steel gap (4) is 5-10 mm.

4. The cooling and sealing device for the rapid cooling section of an annealing furnace in a continuous annealing line according to claim 1, characterized in that: The stainless steel plates (3) are hinged to the furnace body (1) at opposite ends by hinges (6).

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