Annealing furnace for steel strip rolling

Abstract

The utility model discloses an annealing furnace for steel strip rolling, which comprises a furnace body, a partition plate is arranged in the furnace body and divides the inside of the furnace body into a preheating area, a heating area and a cooling area, a return pipe is fixed on the partition plate, a heat insulation sleeve is fixed at one end of the return pipe positioned in the cooling area, and the heat insulation sleeve is sleeved on the furnace body. One end of the heat insulation sleeve is connected with an exhaust fan, and a one-way valve is installed in the end, located in the preheating area, of the backflow pipe. The annealing furnace has the beneficial effects that by arranging the exhaust fan and the return pipe, in the annealing process of the steel strip, the exhaust fan can extract heat emitted by the steel strip in the cooling area and inject the heat into the preheating area again through the return pipe, and meanwhile, the temperature of the heat can be further increased when the heat flows through the heating area, so that the temperature in the preheating area is increased; the power of the heating plate is reduced, heat is reused, energy is saved, emission is reduced, and the use performance of the device is improved.

Description

An annealing furnace for steel strip rolling Technical Field

[0001] This utility model relates to the field of annealing furnace technology, specifically to an annealing furnace for steel strip rolling. Background Technology

[0002] Heat treatment furnaces are classified into annealing furnaces, quenching furnaces, tempering furnaces, normalizing furnaces, and quenching and tempering furnaces. They are mainly used for annealing large carbon steel and alloy steel parts; tempering surface-quenched parts; stress-relieving annealing and aging of weldments, and other heat treatment processes. Heating methods include electric heating, oil heating, gas heating, coal heating, and hot air circulation. Annealing furnaces are a new type of heat exchange equipment. Annealing furnaces are energy-saving periodic operation furnaces with an ultra-energy-saving structure, using a fiber structure, saving 60% of electricity.

[0003] Existing annealing furnaces for steel strip rolling involve conveying the steel strip into the furnace body, where it passes through preheating, heating, and cooling zones to achieve annealing. However, this method fails to utilize the heat dissipated by the steel strip during the cooling process, resulting in heat waste and affecting the performance of the equipment. Therefore, there is an urgent need for a new type of annealing furnace for steel strip rolling to solve these problems. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] The technical problem to be solved by this utility model is to provide an annealing furnace for steel strip rolling that can recover and utilize heat, save energy and reduce emissions, has good performance and high performance, in light of the current state of the technology.

[0006] (II) Technical Solution

[0007] This utility model is achieved through the following technical solution: This utility model proposes an annealing furnace for steel strip rolling, including a furnace body. A partition is provided inside the furnace body, which divides the furnace body into a preheating zone, a heating zone, and a cooling zone. A reflux pipe is fixed on the partition. A heat insulation sleeve is fixed at one end of the reflux pipe located in the cooling zone. An exhaust fan is connected to one end of the heat insulation sleeve. A one-way valve is installed inside the reflux pipe located in the preheating zone.

[0008] Furthermore, the partition is welded into the furnace body, and the preheating zone, the heating zone, and the cooling zone are all formed within the furnace body.

[0009] By adopting the above technical solution, the steel strip is preheated in the preheating zone, heated in the heating zone, and cooled in the cooling zone, thereby achieving annealing of the steel strip.

[0010] Furthermore, the return pipe is embedded in the partition plate, the heat insulation sleeve is fixed to one end of the return pipe by bolts, and the exhaust fan is fixed to one end of the heat insulation sleeve by screws.

[0011] By adopting the above technical solution, during the steel strip annealing process, the exhaust fan can extract the heat emitted by the steel strip in the cooling zone and reinject it into the preheating zone through the return pipe, which can increase the temperature in the preheating zone and reduce the power of the heating plate, thereby enabling the heat to be reused. The heat insulation sleeve can provide heat insulation protection for the exhaust fan.

[0012] Furthermore, the one-way valve is fixed inside the return pipe by screws, the return pipe passes through the heating zone, and both the return pipe and the one-way valve are made of high-temperature resistant materials.

[0013] By adopting the above technical solution, during the heat return process, the heating zone can further heat the heat, and the one-way valve can ensure that the gas flow direction of the return pipe is unidirectional.

[0014] Furthermore, a heating plate is fixed at the bottom of the preheating zone, and the heating plate has an S-shaped structure.

[0015] By adopting the above technical solution, the heating plate can increase the temperature in the preheating zone, thereby preheating the conveyed steel strip.

[0016] Furthermore, a high-frequency coil is fixed at the bottom of the heating zone, and multiple sets of conveyor rollers are arrayed in the middle of the furnace body.

[0017] By adopting the above technical solution, the high-frequency coil can heat the steel strip, and the conveying roller can convey the steel strip.

[0018] Furthermore, two sets of through cavities are symmetrically opened on both sides of the furnace body.

[0019] By adopting the above technical solution, the passage cavity facilitates the entry and exit of steel strips into and out of the furnace body.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] To address the problem that existing annealing furnaces for steel strip rolling involve conveying the steel strip into the furnace and passing it through preheating, heating, and cooling zones for annealing, resulting in heat waste during cooling and impacting equipment performance, this invention addresses this issue by incorporating an exhaust fan and a return pipe. During annealing, the exhaust fan extracts heat from the cooling zone and re-injects it into the preheating zone via the return pipe. Simultaneously, the heat is further heated in the heating zone, increasing the preheating temperature and reducing the power consumption of the heating plates. This not only reuses heat but also saves energy, reduces emissions, and improves equipment performance. Attached Figure Description

[0023] Figure 1 is a structural schematic diagram of an annealing furnace for steel strip rolling according to the present invention;

[0024] Figure 2 is a schematic diagram of the internal structure of the furnace body in the annealing furnace for steel strip rolling according to the present invention.

[0025] Figure 3 is a front view of a one-way valve in an annealing furnace for steel strip rolling according to the present invention.

[0026] The annotations in the attached figures are explained as follows:

[0027] 1. Furnace body; 2. Through cavity; 3. Baffle plate; 4. Conveyor roller; 5. Heating plate; 6. High frequency coil; 7. Return pipe; 8. Heat insulation sleeve; 9. Exhaust fan; 10. Check valve; 11. Preheating zone; 12. Heating zone; 13. Cooling zone. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0029] As shown in Figures 1-3, an annealing furnace for steel strip rolling in this embodiment includes a furnace body 1. A partition 3 is installed inside the furnace body 1, dividing the furnace body 1 into a preheating zone 11, a heating zone 12, and a cooling zone 13. The steel strip is preheated in the preheating zone 11, heated in the heating zone 12, and cooled in the cooling zone 13 to achieve annealing. A return pipe 7 is fixed on the partition 3. A heat insulation sleeve 8 is fixed to one end of the return pipe 7 in the cooling zone 13. One end of the heat insulation sleeve 8 is connected to an exhaust fan 9. During the annealing process, the exhaust fan 9 can extract the heat emitted by the steel strip in the cooling zone 13 and reinject it into the preheating zone 11 through the return pipe 7, which can increase the temperature in the preheating zone 11 and reduce the power of the heating plate 5, thereby making the heat reused. The heat insulation sleeve 8 can provide heat insulation protection for the exhaust fan 9. A one-way valve 10 is installed inside the return pipe 7 at one end of the preheating zone 11. During the heat return process, the heating zone 12 can further heat the heat. The one-way valve 10 can ensure that the gas flow direction of the return pipe 7 is unidirectional.

[0030] As shown in Figures 1-3, in this embodiment, the partition 3 is welded inside the furnace body 1, the preheating zone 11, the heating zone 12 and the cooling zone 13 are all formed inside the furnace body 1, the return pipe 7 is embedded in the partition 3, the heat insulation sleeve 8 is fixed to one end of the return pipe 7 by bolts, the exhaust fan 9 is fixed to one end of the heat insulation sleeve 8 by screws, and the one-way valve 10 is fixed inside the return pipe 7 by screws. The return pipe 7 passes through the heating zone 12, and both the return pipe 7 and the one-way valve 10 are made of high-temperature resistant materials.

[0031] As shown in Figures 1-3, in this embodiment, a heating plate 5 is fixed at the bottom of the preheating zone 11. The heating plate 5 has an S-shaped structure. The heating plate 5 can increase the temperature in the preheating zone 11, thereby preheating the conveyed steel strip. A high-frequency coil 6 is fixed at the bottom of the heating zone 12. Multiple sets of conveying rollers 4 are arrayed in the middle of the furnace body 1. The high-frequency coil 6 can heat the steel strip, and the conveying rollers 4 can convey the steel strip. Two sets of through cavities 2 are symmetrically opened on the two side walls of the furnace body 1. The through cavities 2 facilitate the entry and exit of the steel strip into and out of the furnace body 1.

[0032] The specific implementation process of this embodiment is as follows: When in use, the external power supply is turned on, and the steel strip enters the furnace body 1 through the passage cavity 2 under the action of the external conveying mechanism and is continuously conveyed by the conveying roller 4. During the conveying process of the steel strip, the heating plate 5 can increase the temperature in the preheating zone 11, thereby preheating the conveyed steel strip. The high-frequency coil 6 can heat the steel strip. After heating, the steel strip is naturally cooled through the cooling zone 13 to achieve annealing of the steel strip. During the annealing process of the steel strip, the exhaust fan 9 can extract the heat emitted by the steel strip in the cooling zone 13 and reinject it into the preheating zone 11 through the return pipe 7. At the same time, when flowing through the heating zone 12, the temperature of the heat can be further increased, thereby increasing the temperature in the preheating zone 11 and reducing the power of the heating plate 5. This not only reuses the heat but also saves energy and reduces emissions, improving the performance of the device.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An annealing furnace for steel strip rolling, characterized by: The furnace includes a furnace body (1), and a partition (3) is provided inside the furnace body (1). The partition (3) divides the furnace body (1) into a preheating zone (11), a heating zone (12), and a cooling zone (13). A return pipe (7) is fixed on the partition (3). A heat insulation sleeve (8) is fixed at one end of the return pipe (7) located in the cooling zone (13). A fan (9) is connected to one end of the heat insulation sleeve (8). A one-way valve (10) is installed inside the end of the return pipe (7) located in the preheating zone (11).

2. The annealing furnace for steel strip rolling according to claim 1, characterized in that: The partition (3) is welded inside the furnace body (1), and the preheating zone (11), the heating zone (12) and the cooling zone (13) are all formed inside the furnace body (1).

3. The annealing furnace for steel strip rolling according to claim 1, characterized in that: The return pipe (7) is embedded in the partition plate (3), the heat insulation sleeve (8) is fixed to one end of the return pipe (7) by bolts, and the exhaust fan (9) is fixed to one end of the heat insulation sleeve (8) by screws.

4. The annealing furnace for steel strip rolling according to claim 1, characterized in that: The one-way valve (10) is fixed inside the return pipe (7) by screws. The return pipe (7) passes through the heating zone (12). Both the return pipe (7) and the one-way valve (10) are made of high-temperature resistant materials.

5. The annealing furnace for steel strip rolling according to claim 4, characterized in that: A heating plate (5) is fixed at the bottom of the preheating zone (11), and the heating plate (5) has an S-shaped structure.

6. An annealing furnace for steel strip rolling according to claim 5, characterized in that: A high-frequency coil (6) is fixed at the bottom of the heating zone (12), and multiple sets of conveying rollers (4) are arrayed in the middle of the furnace body (1).

7. An annealing furnace for steel strip rolling according to claim 6, characterized in that: Two sets of through cavities (2) are symmetrically opened on both sides of the furnace body (1).

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