Nitrogen annealing furnace for aluminum plate strip processing

Abstract

The utility model discloses a nitrogen annealing furnace for aluminum plate strip processing, which relates to the field of aluminum plate strip processing and comprises an annealing furnace body, a nitrogen homogenizing mechanism is arranged in the annealing furnace body and comprises a gas inlet pipe fixedly mounted at the top of the annealing furnace body, and a gas inlet branch pipe is arranged at the end of the gas inlet pipe. A nitrogen spraying hole is formed in the outer wall of the gas inlet branch pipe, a placing frame is fixedly installed at the bottom in the annealing furnace body, a circulating cavity is formed in the annealing furnace body, a through hole is formed in the inner wall of the annealing furnace body, a circulating fan is fixedly installed on the outer wall of the annealing furnace body, and a sealing mechanism is arranged on the outer wall of the door frame. According to the nitrogen annealing furnace for aluminum plate strip processing, nitrogen can be uniformly conveyed to all positions in the annealing furnace body, the nitrogen distribution uniformity is ensured, the problem of annealing effect difference caused by non-uniform nitrogen distribution of an aluminum plate strip is effectively avoided, and the quality consistency of the aluminum plate strip after annealing is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum sheet and strip processing technology, specifically to a nitrogen annealing furnace for aluminum sheet and strip processing. Background Technology

[0002] In the aluminum sheet and strip processing, nitrogen annealing furnaces are used to anneal the aluminum sheets and strips. During the annealing process, nitrogen is introduced into the furnace as a protective gas to form an inert gas environment, effectively isolating the aluminum sheets and strips from air and preventing them from reacting with oxygen at high temperatures and oxidizing. This fundamentally ensures the smoothness and integrity of the aluminum sheet and strip surface, while also improving its physical properties, making it better able to meet the needs of subsequent deep processing and different application scenarios.

[0003] In the prior art, Chinese Patent No. CN212610821U discloses a nitrogen cooling device and an annealing furnace, including a first cooler, an oil removal filter, an inlet pipe, and an outlet pipe disposed outside the annealing furnace; the inlet pipe is used to connect to a first end of the heating zone of the annealing furnace, and the outlet pipe is used to connect to a second end of the heating zone; wherein, the first end of the heating zone is used to connect to the rapid cooling zone of the annealing furnace; the inlet pipe is connected to the first cooler, the first cooler is connected to the oil removal filter, and the oil removal filter is connected to the outlet pipe. Before entering the rapid cooling zone, the nitrogen enters the cooling device first. The oil removal filter and the first cooler remove part of the oil mist in the nitrogen, reducing the oil mist concentration in the heating zone and the rapid cooling zone, thereby reducing the source of oil stains; at the same time, the recycling of nitrogen can save a large amount of nitrogen that is directly emitted to remove oil mist, which can reduce costs.

[0004] Based on the above information, the existing nitrogen annealing furnaces, when processing aluminum sheets and strips, exhibit uneven nitrogen distribution within the furnace, leading to variations in annealing effects across different parts of the aluminum sheet and strip. This affects the consistency of product quality. Furthermore, the furnace's sealing structure is not sufficiently robust, making it prone to nitrogen leakage. This not only wastes resources but may also affect the annealing effect and even pose safety hazards. Therefore, further improvements are needed. Utility Model Content

[0005] The purpose of this utility model is to provide a nitrogen annealing furnace for aluminum sheet and strip processing, in order to solve the problems mentioned in the background art. In the prior art, the nitrogen distribution in the furnace is uneven when processing aluminum sheet and strip, which leads to differences in the annealing effect of different parts of the aluminum sheet and strip, affecting the consistency of product quality. In addition, the furnace body sealing structure is not perfect, which is prone to nitrogen leakage, which not only wastes resources, but may also affect the annealing effect and even pose safety hazards.

[0006] To achieve the above object, the utility model provides the following technical solutions: A nitrogen annealing furnace for aluminum plate strip processing, including an annealing furnace body. A door frame is provided on the outer wall of the annealing furnace body, and a furnace door is rotatably installed on the outer wall of the door frame. A nitrogen gas uniform distribution mechanism for uniformly distributing nitrogen gas is provided inside the annealing furnace body. The nitrogen gas uniform distribution mechanism includes an air inlet pipe fixedly installed on the top of the annealing furnace body, and an air inlet branch pipe is provided at the end of the air inlet pipe. Nitrogen gas spray holes are provided on the outer wall of the air inlet branch pipe. A placement rack is fixedly installed at the bottom inside the annealing furnace body. A circulation chamber is opened inside the annealing furnace body. Through holes are opened on the inner wall of the annealing furnace body. A circulation fan is fixedly installed on the outer wall of the annealing furnace body. A sealing mechanism for sealing the furnace door is provided on the outer wall of the door frame.

[0007] Further, the air inlet branch pipe is located at the top inside the annealing furnace body, and the air inlet branch pipes are equiangularly distributed on the outer wall of the air inlet pipe, and the end of the air inlet branch pipe is communicated with the air inlet pipe.

[0008] Further, the nitrogen gas spray holes are equidistantly distributed on the outer wall of the air inlet branch pipe, and the end of the nitrogen gas spray hole is communicated with the inside of the air inlet branch pipe.

[0009] Further, the cross section of the circulation chamber is designed in a "C" shape, and the circulation chamber is communicated with the end of the circulation fan. The through holes are arranged in an array at the top and bottom inside the annealing furnace body. One end of the through hole is communicated with the circulation chamber, and the other end of the through hole is communicated with the inside of the annealing furnace body.

[0010] Further, the placement rack is located at the bottom inside the annealing furnace body, and the placement rack is integrally designed in a hollow manner, and an anti-sticking coating is provided on the outer wall of the placement rack.

[0011] Further, the sealing mechanism includes a sealing convex block fixedly installed on the inner wall of the furnace door. A sealing groove is opened on the outer wall of the door frame, and an inflatable rubber strip is provided on the inner wall of the sealing groove. An inflatable pump is fixedly installed on the top of the annealing furnace body, and an inflatable pipe is provided at the end of the inflatable pump.

[0012] Further, the cross section of the sealing convex block is trapezoidal in design, the sealing groove is circular in design, the inflatable rubber strip is made of high-temperature-resistant butyl rubber material, and an inflatable chamber is provided inside the inflatable rubber strip, and the outer wall of the inflatable rubber strip is fitted with the outer wall of the sealing convex block.

[0013] Further, one end of the inflatable pipe is communicated with the inside of the inflatable rubber strip, and the other end of the inflatable pipe is connected to the inflatable pump.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. This nitrogen annealing furnace for aluminum sheet and strip processing, by setting up a nitrogen uniform distribution mechanism, with the gas inlet pipe cooperating with the gas inlet branch pipes distributed at equal angles and the nitrogen nozzles distributed at equal intervals, can uniformly deliver nitrogen to all parts of the annealing furnace body. At the same time, the combined design of the circulation chamber, through holes and circulation fan makes the nitrogen in the furnace form a circulation flow, further ensuring the uniformity of nitrogen distribution, effectively avoiding the problem of different annealing effects of aluminum sheet and strip due to uneven nitrogen distribution, and greatly improving the consistency of the quality of aluminum sheet and strip after annealing.

[0016] 2. By setting up a sealing mechanism, the sealing protrusion and the annular sealing groove cooperate, and with the setting of the air-filled rubber strip, after the furnace door is closed, air is injected into the air-filled rubber strip by the air pump, so that it expands and tightly fits the sealing protrusion, which significantly enhances the sealing effect at the furnace door, effectively prevents nitrogen leakage, reduces the waste of nitrogen resources, ensures a stable inert gas environment inside the furnace, ensures that the annealing effect is not affected by external factors, and eliminates the safety hazards that may be caused by nitrogen leakage.

[0017] 3. The hollow design and non-stick coating of the placement rack not only allow nitrogen to better contact with the aluminum strip and promote uniform annealing, but also effectively prevent the aluminum strip and the placement rack from sticking together. This facilitates the placement and removal of the aluminum strip and improves the convenience of processing operations and production efficiency. At the same time, the working combination of the circulating fan and the circulating chamber helps to distribute the temperature evenly in the furnace, further improving the annealing quality of the aluminum strip and the placement rack. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the furnace door in the open state of this utility model;

[0020] Figure 3 This is a schematic cross-sectional view of the annealing furnace body of this utility model;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the door frame of this utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the furnace door, door frame, protrusion, and inflatable rubber strip of this utility model;

[0023] Figure 6 This utility model Figure 5 Enlarged structural diagram at point A in the middle.

[0024] In the figure: 1. Annealing furnace body; 2. Furnace door; 201. Sealing bump; 3. Door frame; 301. Sealing groove; 4. Air inlet pipe; 401. Air inlet branch pipe; 402. Nitrogen injection hole; 5. Placing rack; 6. Circulation fan; 601. Circulation chamber; 602. Through hole; 7. Inflatable rubber strip; 701. Inflatable pipe; 702. Inflatable pump. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1: Please refer to Figure 1-3 , the present invention provides the following technical solutions: A nitrogen annealing furnace for aluminum plate strip processing, including an annealing furnace body 1, a door frame 3 is provided on the outer wall of the annealing furnace body 1, and a furnace door 2 is rotatably installed on the outer wall of the door frame 3. A nitrogen uniformity mechanism for evenly distributing nitrogen is provided inside the annealing furnace body 1. The nitrogen uniformity mechanism includes an air inlet pipe 4 fixedly installed on the top of the annealing furnace body 1, and an air inlet branch pipe 401 is provided at the end of the air inlet pipe 4, and nitrogen injection holes 402 are provided on the outer wall of the air inlet branch pipe 401. A placing rack 5 is fixedly installed at the bottom inside the annealing furnace body 1. A circulation chamber 601 is opened inside the annealing furnace body 1, and through holes 602 are opened on the inner wall of the annealing furnace body 1. A circulation fan 6 is fixedly installed on the outer wall of the annealing furnace body 1. The air inlet branch pipe 401 is located at the top inside the annealing furnace body 1, and the air inlet branch pipes 401 are equiangularly distributed on the outer wall of the air inlet pipe 4, and the ends of the air inlet branch pipes 401 are communicated with the air inlet pipe 4. The nitrogen injection holes 402 are equidistantly distributed on the outer wall of the air inlet branch pipe 4, and the ends of the nitrogen injection holes 402 are communicated with the inside of the air inlet branch pipe 4. The cross-section of the circulation chamber 601 is designed in a "C" shape, and the circulation chamber 601 is communicated with the end of the circulation fan 6. The through holes 602 are arranged in an array at the top and bottom inside the annealing furnace body 1, and one end of the through holes 602 is communicated with the circulation chamber 601, and the other end of the through holes 602 is communicated with the inside of the annealing furnace body 1. The placing rack 5 is located at the bottom inside the annealing furnace body 1, and the whole placing rack 5 is designed to be hollow, and an anti-sticking coating is provided on the outer wall of the placing rack 5.

[0027] When the aluminum sheet and strip are annealed, the nitrogen uniformization mechanism starts to work. Nitrogen enters from the inlet pipe 4, which is fixedly installed on the top of the annealing furnace body 1. Since the inlet branch pipes 401 at the end of the inlet pipe 4 are distributed at equal angles on their outer walls and the ends of the inlet branch pipes 401 are connected to the inlet pipe 4, the nitrogen can be evenly distributed to each inlet branch pipe 401. Each inlet branch pipe 401 has nitrogen spray holes 402 evenly distributed on its outer wall, and the ends of the nitrogen spray holes 402 are connected to the inside of the inlet branch pipe 401. In this way, the nitrogen can be evenly sprayed into all parts of the annealing furnace body 1 through the nitrogen spray holes 402, thus initially realizing the dispersion of nitrogen in the furnace space.

[0028] Meanwhile, after the circulating fan 6 is started, the gas flows in the circulating chamber 601 and then returns to the annealing furnace body 1 through the top and bottom through holes 602, thus forming a circulating flow. This further mixes and homogenizes the initially dispersed nitrogen gas, ensuring not only the uniform distribution of nitrogen gas in the horizontal direction but also promoting the concentration balance in the vertical direction. This ensures that all parts of the aluminum strip are under the same nitrogen protective atmosphere during the annealing process, effectively avoiding differences in annealing effect caused by uneven nitrogen distribution and greatly improving the consistency of the quality of the annealed aluminum strip.

[0029] Example 2: Please refer to Figure 3-6 Based on Embodiment 1, a sealing mechanism is also disclosed, the specific structure of which is as follows: the outer wall of the door frame 3 is provided with a sealing mechanism for sealing the furnace door 2. The sealing mechanism includes a sealing protrusion 201 fixedly installed on the inner wall of the furnace door 2. A sealing groove 301 is opened on the outer wall of the door frame 3, and an air-filled rubber strip 7 is provided on the inner wall of the sealing groove 301. An air pump 702 is fixedly installed on the top of the annealing furnace body 1, and an air-filled pipe 701 is provided at the end of the air pump 702. The sealing protrusion 201 has a trapezoidal cross-section, the sealing groove 301 has an annular design, the air-filled rubber strip 7 is made of high-temperature resistant butyl rubber, and an air-filled chamber is provided inside the air-filled rubber strip 7. The outer wall of the air-filled rubber strip 7 is in contact with the outer wall of the sealing protrusion 201. One end of the air-filled pipe 701 is connected to the inside of the air-filled rubber strip 7, and the other end of the air-filled pipe 701 is connected to the air pump 702.

[0030] Before performing the aluminum sheet and strip annealing operation, the furnace door 2 needs to be closed to ensure that a closed space is formed inside the annealing furnace body 1. At this time, the sealing mechanism plays its role. The sealing protrusion 201 fixedly installed on the inner wall of the furnace door 2 corresponds to the annular sealing groove 301 opened on the outer wall of the door frame 3. When the furnace door 2 is rotated and closed, the sealing protrusion 201 is embedded in the sealing groove 301, achieving a preliminary seal. Subsequently, the air pump 702 installed on the top of the annealing furnace body 1 is started, and air is injected into the air-filling rubber strip 7 on the inner wall of the sealing groove 301 through the air-filling pipe 701. Since the annealing furnace body 1 generates a high temperature of no more than 300°C during operation, the air-filling rubber strip is made of butyl rubber that can withstand a high temperature of 300°C. Made of rubber, the sealing protrusion 201 has a trapezoidal cross-section. As the gas inside the inflatable rubber strip 7 increases, the inflatable rubber strip 7 expands and tightly adheres to the outer wall of the sealing protrusion 201, further filling the gap between the sealing protrusion 201 and the sealing groove 301. This tight fit significantly enhances the sealing effect at the furnace door 2, effectively preventing nitrogen from leaking from the furnace door 2. This not only reduces the waste of nitrogen resources, but more importantly, ensures a stable inert gas environment inside the furnace, so that the annealing process is not disturbed by the outside air. This ensures that the aluminum strip is always under good nitrogen protection during the annealing process, thereby ensuring the annealing effect and eliminating potential safety hazards caused by nitrogen leakage.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nitrogen annealing furnace for aluminum sheet and strip processing, comprising an annealing furnace body (1), wherein a door frame (3) is provided on the outer wall of the annealing furnace body (1), and a furnace door (2) is rotatably installed on the outer wall of the door frame (3), characterized in that: Inside the annealing furnace body (1), there is a nitrogen gas uniformity mechanism for evenly distributing nitrogen gas. The nitrogen gas uniformity mechanism includes an air inlet pipe (4) fixedly installed at the top of the annealing furnace body (1). An air inlet branch pipe (401) is provided at the end of the air inlet pipe (4). Nitrogen gas spray holes (402) are provided on the outer wall of the air inlet branch pipe (401). A placement rack (5) is fixedly installed at the inner bottom of the annealing furnace body (1). A circulation chamber (601) is formed inside the annealing furnace body (1). Through holes (602) are formed in the inner wall of the annealing furnace body (1). A circulation fan (6) is fixedly installed on the outer wall of the annealing furnace body (1). A sealing mechanism for sealing the furnace door (2) is provided on the outer wall of the door frame (3).

2. The nitrogen annealing furnace for aluminum plate strip processing according to claim 1, characterized in that: The air inlet branch pipe (401) is located at the inner top of the annealing furnace body (1). The air inlet branch pipes (401) are evenly distributed at equal angles on the outer wall of the air inlet pipe (4). The end of the air inlet branch pipe (401) is communicated with the air inlet pipe (4).

3. The nitrogen annealing furnace for aluminum plate strip processing according to claim 1, characterized in that: The nitrogen gas spray holes (402) are evenly distributed at equal distances on the outer wall of the air inlet branch pipe (401). The end of the nitrogen gas spray hole (402) is communicated with the inside of the air inlet branch pipe (401).

4. The nitrogen annealing furnace for aluminum plate strip processing according to claim 1, characterized in that: The cross-section of the circulation chamber (601) is designed in a "C" shape. The circulation chamber (601) is communicated with the end of the circulation fan (6). The through holes (602) are arranged in an array at the inner top and inner bottom of the annealing furnace body (1). One end of the through hole (602) is communicated with the circulation chamber (601), and the other end of the through hole (602) is communicated with the inside of the annealing furnace body (1).

5. The nitrogen annealing furnace for aluminum plate strip processing according to claim 1, characterized in that: The placement rack (5) is located at the inner bottom of the annealing furnace body (1). The placement rack (X) is integrally designed in a hollow shape. An anti-sticking coating is provided on the outer wall of the placement rack (5).

6. The nitrogen annealing furnace for aluminum plate strip processing according to claim 1, characterized in that: The sealing mechanism includes a sealing convex block (201) fixedly installed on the inner wall of the furnace door (2). A sealing groove (301) is formed on the outer wall of the door frame (3). An inflatable rubber strip (7) is provided on the inner wall of the sealing groove (301). An inflatable pump (702) is fixedly installed on the top of the annealing furnace body (1). An inflatable pipe (701) is provided at the end of the inflatable pump (702).

7. The nitrogen annealing furnace for aluminum plate strip processing according to claim 6, characterized in that: The cross-section of the sealing convex block (201) is trapezoidal. The sealing groove (301) is annular. The inflatable rubber strip (7) is made of high-temperature resistant butyl rubber. An inflatable chamber is provided inside the inflatable rubber strip (7). The outer wall of the inflatable rubber strip (7) is fitted with the outer wall of the sealing convex block (201).

8. The nitrogen annealing furnace for aluminum plate strip processing according to claim 6, characterized in that: One end of the inflatable pipe (701) is communicated with the inside of the inflatable rubber strip (7), and the other end of the inflatable pipe (701) is connected to the inflatable pump (702).

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