Double-surface hot air longitudinal laminar flow hot air circulation vertical continuous heat treatment furnace for strips

Abstract

The utility model relates to a strip double-surface hot air longitudinal laminar flow hot air circulation vertical continuous heat treatment furnace, relates to the field of strip heat treatment equipment, and aims to solve the problem that the product quality is affected due to uneven heating of strips, the strip double-surface hot air longitudinal laminar flow hot air circulation vertical continuous heat treatment furnace comprises a furnace body shell, and the two ends of the furnace body shell in the length direction are open so that the strips can pass through; an airflow circulating part is arranged in the furnace body shell, a fan is arranged on the outer wall of the airflow circulating part, and the fan outputs airflow to the airflow circulating part to heat a strip and recycles the airflow after heating the strip to complete circulation. The heat treatment device has the effect of improving the heating uniformity of the strip during heat treatment.

Description

Technical Field

[0001] This application relates to the field of strip heat treatment equipment, and particularly to a vertical continuous heat treatment furnace for strip with double-surface hot air longitudinal laminar flow hot air circulation. Background Art

[0002] Currently, the heat treatment technology of metal strips has important application values in various industrial fields. Heat treatment can not only improve the mechanical properties of metal materials, but also enhance their processing performance and service life. With the increasing market demand, the development of heat treatment technology has gradually changed from the traditional batch treatment method to the continuous treatment method, thereby improving production efficiency and material quality, and making the heat treatment process widely used in multiple industries such as automotive and aerospace.

[0003] In order to achieve efficient heat treatment of metal strips, horizontal continuous heat treatment furnaces are usually used for heating in the prior art. These heat treatment furnaces are mainly divided into two categories: horizontal furnaces and single-sided heating equipment. The horizontal furnace heats the strip continuously by running the strip horizontally in the furnace body and using heating elements; while the single-sided heating equipment usually adopts the method of single-sided heating. However, although the traditional horizontal continuous heat treatment furnace can achieve continuous production, it has problems such as large floor area, high energy consumption, and uneven heating.

[0004] In particular, uneven heating will lead to unstable strip quality and further affect the quality of the final product. Therefore, there is an urgent need for a new type of heat treatment equipment to overcome the above defects and improve the effect and efficiency of heat treatment. Summary of the Utility Model

[0005] In order to improve the uniformity of heat reception of the strip during heat treatment, this application provides a vertical continuous heat treatment furnace for strip with double-surface hot air longitudinal laminar flow hot air circulation.

[0006] The vertical continuous heat treatment furnace for strip with double-surface hot air longitudinal laminar flow hot air circulation provided by this application adopts the following technical solutions:

[0007] A vertical continuous heat treatment furnace for strip with double-surface hot air longitudinal laminar flow hot air circulation includes a furnace body shell. Both ends of the furnace body shell in the length direction are open for the strip to pass through. An air flow circulation member is arranged inside the furnace body shell, and a blower is arranged on the outer wall of the air flow circulation member. The blower outputs air flow to the air flow circulation member to heat the strip and recovers the air flow after heating the strip to complete the circulation.

[0008] By adopting the above technical solution, during the passing process of the strip, a hot air and strip surface high-speed convective heat exchange is achieved by using a blower and an air flow circulation component. The heat conduction efficiency and temperature uniformity are improved through a closed-loop large cycle. The double-sided hot air longitudinal laminar hot air circulation vertical continuous heat treatment furnace for strips realizes the structural adjustment of the vertical diversion muffle, optimizes the structural strength, and enhances the uniform heating capacity for the strips.

[0009] Optionally, the air flow circulation component includes a muffle outer casing and two diversion plates. The muffle outer casing is installed on the inner wall of the furnace body casing. The length directions of the muffle outer casing and the two diversion plates are consistent with the length direction of the furnace body casing. The two diversion plates are arranged inside the muffle outer casing to divide the internal space of the muffle outer casing into a passing chamber and two circulation chambers. The two circulation chambers are located on both sides of the passing chamber. Openings are provided at both ends of the muffle outer casing in the length direction for the strip to enter and exit the middle chamber. The air outlet of the blower is communicated with the circulation chamber, and the air inlet of the blower is communicated with the passing chamber. The end of the circulation chamber far from the blower is communicated with the passing chamber to form a circulation channel.

[0010] By adopting the above technical solution, the structural design of the muffle outer casing and the two diversion plates divides the internal space of the furnace body casing into a passing chamber and two circulation chambers. During the passing process of the strip, the air outlet of the blower inputs air flow into the circulation chamber. The air flow is heated by the heater in the circulation chamber and enters the passing chamber to heat the strip. The air flow that has completed the heat exchange with the strip is finally sucked in by the air inlet of the blower to complete the cycle. The above solution effectively improves the uniformity and efficiency of the hot air circulation, thereby enhancing the uniformity of strip heating and the heat treatment effect.

[0011] Optionally, the blower is installed at one end of the muffle outer casing in the length direction.

[0012] By adopting the above technical solution, installing the blower at one end of the muffle outer casing in the length direction facilitates the blower to suck in air flow, so that the maximum circulating air flow can be formed inside the furnace body casing. Thus, after the air flow output to the circulation chamber is heated by the heater, it can uniformly heat the strip, and at the same time, the air flow that has completed the heat exchange with the strip is recovered to complete the cycle, improving the efficiency of air flow circulation and the uniformity of heating during the heat treatment process.

[0013] Optionally, air outlet holes are provided at the end of the circulation chamber far from the blower and are communicated with the passing chamber. The air outlet holes are located on the side wall of the diversion plate at the end far from the blower.

[0014] Optionally, a plurality of air equalizing vanes are arranged in the two circulation chambers, and the plurality of air equalizing vanes are all installed on the inner wall of the muffle outer casing.

[0015] By adopting the above technical solution, a plurality of air-distributing vanes are arranged inside the circulation chamber, which can significantly improve the uniformity of the hot air in the circulation chamber, further enhance the uniformity of strip heating, and optimize the heating effect.

[0016] Optionally, an air flow guiding arc plate is arranged on one side of the circulation chamber close to the air outlet. One end of the air flow guiding arc plate is connected to the inner wall of the muffle outer casing opposite to the air outlet, and the other end is connected to the inner wall of the muffle outer casing far from the blower.

[0017] By adopting the above technical solution, an air flow guiding arc plate is arranged on one side of the circulation chamber close to the air outlet, which can effectively guide the air flow, reduce turbulence, and further improve the hot air circulation efficiency and heating uniformity.

[0018] Optionally, a temperature sensor is arranged inside the circulation chamber. The temperature sensor is installed at the air outlet of the flow guiding plate. The temperature sensor is electrically connected to a controller. The blower is controlled by the controller. The temperature sensor is used to detect the air flow temperature inside the circulation chamber, and the controller is used to control the blowing power of the blower according to the air flow temperature.

[0019] By adopting the above technical solution, the temperature sensor arranged inside the circulation chamber can detect the air flow temperature in real time and transmit the temperature signal to the controller. The controller automatically adjusts the blowing power of the blower according to the detected air flow temperature, so as to realize the precise control of the temperature in the furnace and further improve the heating uniformity and heat treatment effect.

[0020] Optionally, a plurality of strengthening pipes are arranged on the outer wall of the furnace body shell. The plurality of strengthening pipes are arranged in sequence along the length direction of the furnace body shell.

[0021] By adopting the above technical solution, the strengthening pipes are arranged in sequence along the length direction of the furnace body shell, effectively enhancing the structural strength of the furnace body shell and improving the stability and durability of the furnace body.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. During the passing of the strip, the blower and the air flow circulation component are used to realize the high-speed convective heat exchange between the hot air and the strip surface. Through the closed-loop large circulation, the heat conduction efficiency and temperature uniformity are improved. The vertical continuous heat treatment furnace for double-sided hot air longitudinal laminar hot air circulation of the strip realizes the structural adjustment of the vertical flow guiding muffle, optimizes the structural strength, and enhances the uniform heating ability of the strip.

[0024] 2. The structural design of the muffle outer casing and the two flow guiding plates divides the internal space of the furnace body shell into a passing chamber and two circulating chambers. During the passing process of the strip, the air outlet of the fan inputs air flow into the circulating chamber. The air flow is heated by the heater in the circulating chamber and enters the passing chamber to heat the strip. The air flow that has completed the heat exchange with the strip is finally sucked into the air inlet of the fan to complete the cycle. The above solution effectively improves the uniformity and efficiency of the hot air circulation, thereby improving the uniformity of the strip heating and the heat treatment effect.

[0025] 3. An air flow guiding arc plate is arranged on one side of the circulating chamber close to the air outlet hole, which can effectively guide the air flow, reduce the turbulence, and further improve the hot air circulation efficiency and heating uniformity. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a vertical continuous heat treatment furnace for double-sided hot air longitudinal laminar hot air circulation of a strip in an embodiment of the present application.

[0027] Figure 2 It is a cross-sectional view for showing the air flow circulating member in an embodiment of the present application.

[0028] Figure 3 is Figure 2 an enlarged schematic view of A in

[0029] Description of the reference numerals: 1. Furnace body shell; 11. Reinforcing pipe; 2. Air flow circulating member; 21. Muffle outer casing; 211. Air equalizing blade; 212. Air flow guiding arc plate; 22. Flow guiding plate; 221. Air outlet hole; 222. Temperature sensor; 223. Controller; 23. Passing chamber; 24. Circulating chamber; 3. Fan. Detailed Embodiment

[0030] The following Figures 1-3 further describes the present application in detail.

[0031] An embodiment of the present application discloses a vertical continuous heat treatment furnace for double-sided hot air longitudinal laminar hot air circulation of a strip. Referring to Figure 1 and Figure 2 , the vertical continuous heat treatment furnace for double-sided hot air longitudinal laminar hot air circulation of a strip includes a furnace body shell 1, and both ends of the furnace body shell 1 are open in the length direction for the strip to pass through. An air flow circulating member 2 is arranged inside the furnace body shell 1, and a fan 3 is arranged on the outer wall of the air flow circulating member 2. The fan 3 outputs air flow to the air flow circulating member 2 to heat the strip, and recovers the air flow after heating the strip to complete the cycle.

[0032] During the process of the strip passing through, the hot air and the strip surface achieve high-speed convective heat exchange by using the blower 3 and the air flow circulation component 2. By means of a closed-loop large circulation, the heat conduction efficiency and temperature uniformity are improved. This vertical continuous heat treatment furnace for double-sided hot air longitudinal laminar hot air circulation of the strip realizes the structural adjustment of the vertical diversion muffle, optimizes the structural strength, and enhances the uniform heating capacity of the strip.

[0033] Refer to Figure 1 and Figure 2 Refer to

[0034] Refer to Figure 2 and Figure 3 Refer to

[0035] The length directions of the muffle outer casing 21 and the two guide plates 22 are the same as the length direction of the furnace body casing 1. The two guide plates 22 are integrally formed on the inner wall of the muffle outer casing 21. The guide plates 22 preferably adopt a corrugated structure, which strengthens the stability of the air flow inside the muffle outer casing 21, thereby improving the heating uniformity. The guide plates 22 divide the muffle into three chambers: the left chamber and the right chamber are used as the hot air axial large circulation air spraying chambers, which are called the circulation chambers 24, and the middle chamber is used as the working chamber for the strip to pass through, which is called the passing chamber 23.

[0036] The blower 3 is installed at one end of the muffle outer casing 21 in the length direction. Its air outlet is communicated with the circulation chamber 24, and its air inlet is communicated with the passing chamber 23. The blower 3 adopts a cross-flow blower 3. Compared with traditional axial-flow or centrifugal blowers 3, the cross-flow blower 3 has the characteristic of a smaller diameter. This design enables the furnace width to be made smaller, thereby reducing the space occupied by the overall furnace body. The heaters are installed in the left and right circulation chambers 24. The heaters preferably adopt a horizontal insertion method, which is convenient for maintenance; the heaters can adopt electric heaters or natural gas burners.

[0037] Refer to Figure 2 and Figure 3, an air outlet hole 221 is provided at one end of the circulation chamber 24 away from the blower 3, and the air outlet hole 221 is located on the side wall of the deflector 22 away from the blower 3. This design ensures that the hot air can uniformly heat the strip and can be smoothly recovered after passing through the strip, forming a closed-loop circulation.

[0038] A plurality of air-distributing vanes 211 are also provided in the circulation chamber 24, and these air-distributing vanes 211 are integrally formed on the inner wall of the muffle outer cylinder 21. The setting of the air-distributing vanes 211 strengthens the uniform distribution of the air flow and improves the heating effect. For example, the air-distributing vanes 211 are made of aluminum alloy, with a smooth surface, good heat resistance and corrosion resistance, and can effectively prevent oxidation in a high-temperature environment.

[0039] An air-flow guiding arc plate 212 is integrally formed on one side of the circulation chamber 24 close to the air outlet hole 221. One end of the air-flow guiding arc plate 212 is connected to the inner wall of the muffle outer cylinder 21 away from the air outlet hole 221, and the other end is connected to the inner wall of the muffle outer cylinder 21 away from the blower 3. The air-flow guiding arc plate 212 guides the air flow to flow more uniformly to the strip.

[0040] During operation, the air flows continuously sent out by the two sets of blowers 3 enter the left and right circulation chambers 24. After the air flow is made uniform by the air-distributing vanes 211, it contacts the heater and is heated by the heater. The heated circulating air flow moves along the length direction of the circulation chamber 24 and is discharged from the air outlet hole 221 to the passing chamber 23. It enters the passing chamber 23 and is separated by the continuously passing strip, and after high-speed convective heat exchange with the two surfaces of the strip, it is sucked into the suction port of the blower 3, forming a large closed-loop circulation.

[0041] Refer to Figure 2 and Figure 3 , a temperature sensor 222 is also installed in the circulation chamber 24, and the temperature sensor 222 is located on the side of the deflector 22 close to the air outlet hole 221. The temperature sensor 222 is electrically connected to the controller 223. The temperature sensor 222 is used to detect the air flow temperature at the air outlet hole 221. In this implementation, the controller 223 is a PLC controller 223. The controller 223 is used to receive the signal of the temperature sensor 222 and control the blower 3 to increase or decrease the blowing power when the air flow temperature exceeds or is lower than the specified temperature range.

[0042] Refer to Figure 2 and Figure 3 , a reinforcing pipe 11 is welded to the outer wall of the furnace body shell 1. The reinforcing pipe 11 is made of the same material as the furnace body shell 1. The setting of the reinforcing pipe 11 further strengthens the structural strength of the furnace body and improves the overall safety and reliability.

[0043] The implementation principle of a vertical continuous heat treatment furnace with hot air longitudinal laminar flow and hot air circulation on both surfaces of a strip in an embodiment of this application is as follows: During operation, the air flow continuously conveyed by the fan 3 enters the left and right two circulation chambers 24. After the air flow is evenly distributed by the air distribution blades 211, the air flow contacts the heater and is heated by the heater. The heated circulating air flow moves along the length direction of the circulation chamber 24 and is discharged through the air outlet holes 221 into the passing chamber 23. It enters the passing chamber 23 and is separated by the continuously passing strip, and after high-speed convective heat exchange with the two surfaces of the strip, it is sucked into the suction port of the fan 3, forming a closed-loop large cycle. By means of the closed-loop large cycle, the heat conduction efficiency and temperature uniformity are improved. This vertical continuous heat treatment furnace with hot air longitudinal laminar flow and hot air circulation on both surfaces of the strip realizes the structural adjustment of the vertical diversion muffle, optimizes the structural strength, and enhances the ability to uniformly heat the strip.

[0044] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A vertical continuous heat treatment furnace for hot air longitudinal laminar hot air circulation on both surfaces of a strip, comprising a furnace body housing (1), and both ends of the furnace body housing (1) in the length direction are open for the strip to pass through, and it is characterized in that: An air flow circulation component (2) is arranged inside the furnace body shell (1). A blower (3) is arranged on the outer wall of the air flow circulation component (2). The blower (3) outputs air flow to the air flow circulation component (2) to heat the strip, and recovers the air flow after heating the strip to complete the circulation.

2. The vertical continuous heat treatment furnace with hot air longitudinal laminar flow and hot air circulation on both surfaces of the strip according to claim 1, characterized in that: The air flow circulation component (2) includes a muffle outer shell (21) and two flow guiding plates (22). The muffle outer shell (21) is installed on the inner wall of the furnace body shell (1). The length directions of the muffle outer shell (21) and the two flow guiding plates (22) are the same as the length direction of the furnace body shell (1). The two flow guiding plates (22) are arranged inside the muffle outer shell (21) to divide the inner space of the muffle outer shell (21) into a passing chamber (23) and two circulation chambers (24). The two circulation chambers (24) are located on both sides of the passing chamber (23). Openings are arranged at both ends of the muffle outer shell (21) in the length direction for the strip to enter and exit the middle chamber. The air outlet of the blower (3) is communicated with the circulation chamber (24), and the air inlet of the blower (3) is communicated with the passing chamber (23). The end of the circulation chamber (24) far from the blower (3) is communicated with the passing chamber (23) to form a circulation channel.

3. A vertical continuous heat treatment furnace with hot air longitudinal laminar hot air circulation on both surfaces of a strip according to claim 2, characterized in that: The blower (3) is installed at one end of the muffle outer shell (21) in the length direction.

4. A vertical continuous heat treatment furnace for hot air longitudinal laminar hot air circulation on both surfaces of a strip, characterized in that: An air outlet hole (221) is arranged at the end of the circulation chamber (24) far from the blower (3) and is communicated with the passing chamber (23). The air outlet hole (221) is located on the side wall of the flow guiding plate (22) at the end far from the blower (3).

5. A vertical continuous heat treatment furnace for hot air longitudinal laminar hot air circulation on both surfaces of a strip, characterized in that: A plurality of air equalizing blades (211) are arranged in the two circulation chambers (24). The plurality of air equalizing blades (211) are all installed on the inner wall of the muffle outer shell (21).

6. A vertical continuous heat treatment furnace for hot air longitudinal laminar hot air circulation on both surfaces of a strip, according to claim 4, characterized in that: An air flow guiding arc plate (212) is arranged on the side of the circulation chamber (24) close to the air outlet hole (221). One end of the air flow guiding arc plate (212) is connected to the inner wall of the muffle outer shell (21) opposite to the air outlet hole (221), and the other end is connected to the inner wall of the muffle outer shell (21) at the end far from the blower (3).

7. A vertical continuous heat treatment furnace with hot air longitudinal laminar hot air circulation on both surfaces of a strip, as claimed in claim 4, wherein: A temperature sensor (222) is arranged in the circulation chamber (24). The temperature sensor (222) is installed on the flow guiding plate (22) at the air outlet hole (221). The temperature sensor (222) is electrically connected to a controller (223). The blower (3) is controlled by the controller (223). The temperature sensor (222) is used to detect the air flow temperature in the circulation chamber (24), and the controller (223) is used to control the blowing power of the blower (3) according to the air flow temperature.

8. A vertical continuous heat treatment furnace with hot air longitudinal laminar hot air circulation on both surfaces of a strip, as claimed in claim 1, wherein: A plurality of strengthening pipes (11) are arranged on the outer wall of the furnace body shell (1). The plurality of strengthening pipes (11) are arranged in sequence along the length direction of the furnace body shell (1).

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