Dynamic heat exchange control system in continuous casting and rolling process of aluminum alloy bar

Abstract

The invention discloses a dynamic heat exchange control system in the continuous casting and rolling process of an aluminum alloy bar, relates to the technical field of aluminum alloy casting and rolling, and adopts a single-section control mode in a continuous rolling line of the aluminum alloy bar, the conveying speed in the rolling action is not changed, and the key point is that cooling water flows in a transverse water pipe; the external environment temperature in the non-natural heat exchange process of the aluminum alloy bar is simulated, specifically, centralized control is conducted on temperature changes in the heat exchange process, firstly, the natural heat dissipation state is simulated on the basis of a temperature drop coefficient model, and secondly, the temperature drop coefficient model is combined with a heat balance formula in the water-cooling indirect heat exchange process to simulate the external environment temperature in the non-natural heat exchange process. A dynamic heat exchange environment is formed in the heat shield according to a heat dissipation state through a single substitution calculation mode and a conversion mode between heat transferred by the aluminum alloy bar and a temperature difference, and the dynamic heat exchange process is realized only by a single variable, so that the influence on the product quality due to relatively large temperature fluctuation change is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy casting and rolling, and in particular to a dynamic heat exchange control system for the continuous casting and rolling process of aluminum alloy bars. Background Art

[0002] Aluminum alloy raw materials undergo three key processes: melting, continuous casting, and online rolling to obtain products of corresponding specifications. The key parameter in the overall process is temperature control, which is specifically manifested as: the continuous casting temperature range is 690~740℃, followed by water cooling until the surface temperature is maintained at 200~300℃. The focus is on the temperature gradient control process in the subsequent rolling process.

[0003] Taking the relevant content in publication number CN108405607A as an example, it specifically includes rough rolling, intermediate rolling and finishing rolling. The temperature range changes are: 480~520℃, 450~480℃, and 380~420℃. In essence, it is to ensure that the aluminum ingot maintains a high temperature and meets the rolling requirements while showing a temperature step cooling state. However, the aluminum ingot has a temperature loss problem during the rolling and transportation process. Its natural cooling rate is related to the workpiece size and ambient temperature. What needs to be explained is: If the temperature of the workpiece when entering the intermediate rolling section from the rough rolling section is significantly lower than the temperature requirement of 450-480°C, the rolling requirements cannot be met, or the material deformation resistance increases, affecting the rolling quality. If the temperature is higher than the temperature requirement of 450-480°C, there may be risks such as material tissue damage, surface quality defects, and equipment failure. The present invention proposes a solution to this problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a dynamic heat exchange control system for the continuous casting and rolling process of aluminum alloy bars, targeting the temperature process in the rolling process of aluminum alloy bars. Because the rolling process is divided into multiple stages and there are gradient differences in the temperature requirements of each rolling process, considering the natural cooling efficiency, the temperature changes directly affect the rolling quality.

[0005] The object of the present invention can be achieved by the following technical solution: a dynamic heat exchange control system for the continuous casting and rolling process of aluminum alloy bars, applied in a continuous rolling production line, comprising a conveying assembly and a rolling action member, wherein the conveying assembly is provided with a heat shield, the rolling action member is provided at both ends of the heat shield, and the heat shield is provided with a temperature sensing structure, a temperature control assembly control and a transverse water pipe; The continuous rolling production line is also provided with a water circulation module corresponding to the horizontal water pipe, and the dynamic heat exchange control system integrates the water circulation module, the temperature measurement sensor structure and the temperature control assembly control to adopt variable temperature intervention action; In the variable temperature intervention action, the temperature parameters in the heat insulation cover and the action parameters during the rolling of the aluminum alloy bar are obtained through the temperature measuring sensor structure, and a temperature drop coefficient model is established with the temperature parameters and action parameters. The heat dissipation coefficient of the aluminum alloy bar rolling is obtained in the temperature drop coefficient model. Finally, a temperature threshold set is proposed for the temperature drop coefficient model according to the rolling action parts, and the temperature threshold set and the heat dissipation coefficient are used to output action instructions to the water circulation module. The water circulation module performs intervention actions on the aluminum alloy bar through the action instructions.

[0006] It is further configured as follows: the transverse water pipe is arranged along the length direction of the heat insulation cover, and the water flow direction in the transverse water pipe is opposite to the conveying direction of the aluminum alloy bar in the conveying assembly. It is further set as follows: The temperature drop coefficient model is expressed as , including the cooldown period , aluminum alloy bar density Specific heat capacity of aluminum alloy bars , thermal conductivity of aluminum alloy bars , initial temperature of aluminum alloy bar , external ambient temperature and target temperature , and set the cooling time to a constant value in the temperature drop coefficient model.

[0007] It is further set as follows: the initial temperature of the aluminum alloy bar is set according to the setting position of the temperature sensing structure and the conveying direction of the aluminum alloy bar Subdivided 、 , 、 They represent the starting temperature and the temperature after heat exchange in a certain section of the continuous production line, respectively. - / Indicates the heat dissipation coefficient.

[0008] Further setting is: setting association according to the setting position of rolling action parts 、 Temperature threshold set 、 , the target temperature in the temperature drop coefficient model Set according to the temperature threshold set and is a relative constant.

[0009] It is further configured as follows: the water circulation module includes a water pump and a water source tank, the water source tank is used to provide a cooling water source, the water pump is used to pump the cooling water into the horizontal water pipe in the direction from left to right, and the water inlet temperature measuring point and the water outlet temperature measuring point are respectively set at the position of the horizontal water pipe corresponding to the rolling workpiece; by 、 Indicates the water temperature at the inlet and outlet temperature measurement points, and simultaneously establishes 、 The heat balance formula , and simultaneously establish the heat conversion formula between the heat transferred by aluminum alloy bars and the temperature difference .

[0010] Further set as: In the heat balance formula, Reflects the flow rate of cooling water in the horizontal water pipe, and pre-sets the target temperature in the temperature drop coefficient model according to the temperature threshold set , and the target temperature Substitute it into the temperature drop coefficient model to get the external ambient temperature; The external ambient temperature Substituting into the heat balance formula and get , and generates a conversion method between the flow rate of cooling water in the horizontal water pipe and the target temperature, thereby controlling the flow rate of cooling water in the horizontal water pipe and forming a dynamic heat exchange environment inside the heat insulation cover.

[0011] The present invention has the following beneficial effects: 1. A single-section control method is used to control the heat exchange process during the continuous rolling of aluminum alloy bars. Specifically, a heat shield is used as the basis to place the aluminum alloy bars in a non-natural heat dissipation environment. The key is to add transverse water pipes to the heat shield. The transverse water pipes continuously pump cooling water during the continuous rolling process of the aluminum alloy bars. Its essence is to directly change the external environment temperature during the heat dissipation process of the aluminum alloy bars. Its key purpose is to use a controllable heat dissipation process to meet the temperature requirements of different sections in the continuous rolling line to avoid the impact of temperature fluctuations on product rolling quality. 2. Based on the above content, the temperature changes during the heat exchange process of aluminum alloy bars are centrally controlled. First, the natural heat dissipation state is simulated with the temperature drop coefficient model. However, in order to reduce the difficulty of temperature control in different work sections, the conveying speed during the rolling action is not changed. Secondly, combined with the heat balance formula for water-cooled indirect heat exchange and the conversion method between the heat transferred by the aluminum alloy bar and the temperature difference, a dynamic heat exchange environment is formed inside the heat insulation cover according to the heat dissipation state through a single substitution calculation method. The dynamic heat exchange process is realized with only a single variable to avoid affecting product quality due to large temperature fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 A structure schematic view of the continuous rolling production line in a dynamic heat exchange control system of an aluminum alloy rod continuous casting and rolling process is provided in the present application. Figure 2 A cross-sectional view of the heat shield is provided in the present application. Figure 1 A cross-sectional view of the heat shield is provided in the present application. Figure 3 A flow direction schematic view of the water circulation module in the present application is provided. Figure 4 A running schematic view of the dynamic heat exchange control system of the aluminum alloy rod continuous casting and rolling process is provided in the present application.

[0014] In the figure: 1, conveying assembly; 2, heat shield; 3, temperature control assembly control; 4, temperature measurement sensing structure; 5, rolling action piece; 6, transverse water pipe. DETAILED DESCRIPTION

[0015] The technical solutions of the present application will be described in detail below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0016] Embodiment one: for the temperature process in the aluminum alloy rod rolling process, because the rolling process is divided into multiple sections, and there is a gradient difference in the temperature requirement in each rolling process, considering the natural cooling efficiency, the temperature change directly affects the rolling quality, and the following technical solution is proposed: Referring to Figures 1-4 The dynamic heat exchange control system of the aluminum alloy rod continuous casting and rolling process in the present embodiment is applied in the continuous rolling production line, and includes the conveying assembly 1 and the rolling action piece 5. The heat shield 2 is arranged on the conveying assembly 1, and the rolling action piece 5 is arranged at the positions of both ends of the heat shield 2. The temperature measurement sensing structure 4, the temperature control assembly control 3 and the transverse water pipe 6 are arranged on the heat shield 2. The water circulation module corresponding to the transverse water pipe 6 is also arranged in the continuous rolling production line. The dynamic heat exchange control system integrates the water circulation module, the temperature measurement sensing structure 4 and the temperature control assembly control 3, and adopts variable temperature intervention action. In the variable temperature intervention action, the temperature parameters in the heat insulation cover 2 and the action parameters during the rolling of the aluminum alloy bar are obtained through the temperature measuring sensor structure 4, and a temperature drop coefficient model is established with the temperature parameters and the action parameters, and the heat dissipation coefficient of the aluminum alloy bar rolling is obtained in the temperature drop coefficient model. Finally, a temperature threshold set is proposed for the temperature drop coefficient model according to the rolling action part 5, and an action instruction is output to the water circulation module with the temperature threshold set and the heat dissipation coefficient. The water circulation module intervenes in the aluminum alloy bar through the action instruction. The transverse water pipe 6 is arranged along the length direction of the heat insulation cover 2, and the water flow direction in the transverse water pipe 6 is opposite to the conveying direction of the aluminum alloy bar in the conveying assembly 1.

[0017] Basic Principle: A brief description of the aluminum alloy bar casting and rolling process: First, the aluminum bar base material is cast, and then it is further fed into the continuous rolling production line while maintaining heat preservation, so that the aluminum bar base material is gradually stretched to the corresponding specifications of the aluminum bar. In essence, it is a process of multiple reductions in the diameter of the aluminum bar base material. Among them, there are three continuous sections: rough rolling, intermediate rolling and finishing rolling. The temperature requirements of each section are different. In essence, the aluminum alloy bar has a natural cooling process during the continuous transmission process. According to the temperature requirements of the sections of 480~520℃, 450~480℃ and 380~420℃, the natural heat dissipation process of the aluminum alloy bar is mainly related to the workpiece size and ambient temperature. After the workpiece enters the intermediate rolling section from the rough rolling section, the temperature is specifically required to be reduced from the temperature range of 480-520°C to the temperature range of 450-480°C. However, the heat dissipation efficiency is relatively slow during the natural heat dissipation process, and because the heat dissipation effect is greatly affected by the external temperature, the temperature variation range is relatively large. In this regard, the present invention adds a heat shield 2 to the conveying assembly 1, and it is necessary to briefly explain that: Because the specifications of aluminum alloys are different, the specific structures of the conveying assembly 1 and the heat shield 2 are not limited in the present invention. It should be noted that: a transverse water pipe 6 is added according to the conveying direction of the aluminum alloy bars in the conveying assembly 1, and cooling water is continuously pumped into the transverse water pipe 6 to cool the aluminum alloy bars. Figure 2 For example, if the aluminum alloy bar moves from right to left, the cooling water in the transverse water pipe 6 can only flow from left to right; Because the aluminum alloy bar conveying process is specifically placed inside the heat insulation cover 2, the external environment relative to the aluminum alloy bar is only represented as the internal environment of the heat insulation cover 6. Therefore, the external environment during the natural heat dissipation process of the aluminum alloy bar is essentially determined by its own temperature. It can even be understood that the internal environment temperature of the heat insulation cover 2 is close to or equal to the temperature of the aluminum alloy bar itself, and is explained in conjunction with the natural heat dissipation process of the aluminum alloy. Specifically generate the temperature drop coefficient model between cooling time and target temperature: , including the cooldown period , aluminum alloy bar density Specific heat capacity of aluminum alloy bars , thermal conductivity of aluminum alloy bars , initial temperature of aluminum alloy bar , external ambient temperature and target temperature , a brief description of it is: Because the aluminum alloy rod is placed in the heat insulation cover 2, the external environment temperature of the aluminum alloy rod is close to the initial temperature of the aluminum alloy rod, so its natural cooling rate is slow. However, the key content of the present invention is: the external environment temperature is changed by the flow process of cooling water in the transverse water pipe 6. Its principle is an indirect heat exchange process, and the high temperature difference is used to improve the heat exchange efficiency of the aluminum alloy rod.

[0018] Example 2: Supplementary explanation of the relevant parameters in Example 1: As shown in Example 1, and referring to Figure 1 , Figure 1 The relevant structure shown in the figure is mainly used to represent a conventional continuous rolling line, wherein the rolling action part 5 is mainly used to represent conventional rolling equipment. However, it should be noted that at least three or more rolling action parts are provided in the overall continuous rolling line, which are specifically subdivided into three sections: rough rolling, intermediate rolling and finishing rolling. This embodiment only takes one of the sections as an example. Figure 1 The rolling action piece 5 at the middle right position represents the entrance to the middle rolling section, and the rolling action piece at the left position represents the completion port of the middle rolling section. The temperature sensing structure 4 of the present invention is essentially a temperature detection unit, such as a high-temperature temperature sensor or an infrared sensor, which obtains the temperature of the aluminum alloy bar in the heat shield 2 in real time. The setting position of the temperature sensing structure 4 corresponds to the setting position of the rolling action piece 5. According to the setting position of the temperature sensing structure 4, the initial temperature of the aluminum alloy bar is set to Subdivided 、 , and when the aluminum alloy bar begins to enter the intermediate rolling section for heat exchange, the initial temperature of the aluminum alloy bar should be equal to When the aluminum alloy bar passes through the heat exchange process of the intermediate rolling section and enters the finishing rolling section, the initial temperature of the aluminum alloy bar should be equal to , which can be further understood as: Density of aluminum alloy bar in cooling time-target temperature drop coefficient model in Example 1 Specific heat capacity of aluminum alloy bars , thermal conductivity of aluminum alloy bars is a direct constant, and the initial temperature of the aluminum alloy bar , target temperature It is a relative constant value, which changes according to the temperature control process and process parameters in the three sections, while the external environment temperature , Cooling time For direct compilation, and cooling time It is related to the conveying speed of the conveying assembly 1 for the aluminum alloy bars. Specifically, if the total length of the intermediate rolling section is L, then the conveying speed can be limited to L / ; In the temperature drop coefficient model, the heat dissipation coefficient is calculated as follows: ( - ) / , which is expressed as the heat dissipation ratio of the aluminum alloy bar temperature per unit time, and the temperature threshold set is mainly used to express the temperature requirement of the rolling action part 5 when rolling the aluminum alloy bar. Specifically, the temperature threshold set in the rolling action is further set according to the setting position of the rolling action part 5. 、 , taking the range of 450~480℃ (intermediate rolling) and 380~420℃ (finishing rolling) as an example, 450℃< <480℃、380℃< <420℃, target temperature in the temperature drop coefficient model It is specifically determined according to the temperature threshold set and is a relative constant; Further explanation of the water circulation module: The essence of the water circulation module is the water pump and the water source tank. The water source tank is used to provide a stable cooling water source, and the water pump is mainly used to continuously pump the cooling water from left to right into the horizontal water pipe 6. Figure 3 To explain: When cooling water is continuously pumped into the transverse water pipe by a water pump, an inlet temperature measuring point and an outlet temperature measuring point are respectively set at the setting position of the two rolling workpieces and the cooling water flow direction, and the water temperatures at the inlet temperature measuring point and the outlet temperature measuring point are further expressed as: 、 , based on the heat balance formula to generate 、 The calculation formula is: ; Among them It represents the heat transfer capacity of cooling water and is directly related to the heat dissipation of aluminum alloy bars. Refer to Fourier's law: , where Q represents the total heat transferred by the aluminum alloy bar, k is the metal thermal conductivity, S is the cross-sectional area, is the temperature difference between the two ends of the aluminum alloy bar, t is the heat exchange time, and L is the heat exchange distance of the aluminum alloy bar. is a variable and is related to the target temperature in the temperature drop coefficient model There is a direct correlation; and Indicates the quality of cooling water, which is specifically related to the flow rate of cooling water in the horizontal water pipe 6, and It is expressed as the constant pressure specific heat capacity of the cooling water, and can limit the initial water temperature of the cooling water entering the horizontal water pipe 6, thereby expressing Is a fixed value.

[0019] Example 3: Combine Example 1 and Example 2 to perform an overall analysis of the temperature drop coefficient model: In order to simplify the overall continuous rolling line, each section is connected end to end. If the rotation speed of the aluminum alloy bar in a certain section in the conveying assembly 1 is limited to change the heat exchange of the aluminum alloy bar, it will cause the parameters in each section to be disordered and the control process is very complicated. Therefore, the present invention also reduces the cooling time. Set to a fixed value, with the flow rate of cooling water in the horizontal water pipe 6 as the only variable, specifically including the following: S1: Figure 1 The structure position shown is the intermediate rolling section in the continuous rolling line. First, the target temperature in the rough rolling section is used as the initial temperature of the aluminum alloy bar in the intermediate rolling section. It can be directly understood that: in the intermediate rolling section, Expressed as the initial temperature of the aluminum alloy bar , and further according to the middle rolling section Set the target temperature in the temperature drop coefficient model , by 、 Substitute into the temperature drop coefficient model to estimate the external ambient temperature ; S2: and further substitute it into the heat transfer formula of heat dissipation coefficient ( - ) / and further refer to Fourier's law , according to the target temperature in S1 、 The difference between The total heat transferred by the aluminum alloy bar is calculated and the obtained Q is substituted into the heat balance formula, where 、 is a fixed value, and For subsequent variable values, This formula translates to: , it can be directly understood that: During the specific operation, the action instructions sent to the water circulation module are mainly used to change the flow rate of the cooling water in the horizontal water pipe 6. The change in the cooling water flow rate is specifically reflected in variables, thereby forming a dynamic heat exchange environment inside the heat shield 2, mainly cooperating with the non-natural heat exchange process of the aluminum alloy bar.

[0020] In summary, the single-section control method is adopted in the continuous rolling line for aluminum alloy bars. The conveying speed during the rolling action is not changed. The key is to simulate the external ambient temperature during the non-natural heat exchange process of the aluminum alloy bars by the flow of cooling water in the horizontal water pipes. Specifically, it is reflected in: Regarding the centralized control of temperature changes during the heat exchange process, the natural heat dissipation state is first simulated based on the temperature drop coefficient model. Secondly, it is combined with the heat balance formula for water-cooled indirect heat exchange and the conversion method between the heat transferred by the aluminum alloy bar and the temperature difference. Through a single substitution calculation method, a dynamic heat exchange environment is formed inside the heat insulation cover according to the heat dissipation state. The dynamic heat exchange process is realized with only a single variable to avoid the impact of large temperature fluctuations on product quality.

[0021] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0022] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0023] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dynamic heat exchange control system for aluminum alloy bar continuous casting and rolling process, applied in a continuous rolling production line, comprising a conveying assembly (1) and a rolling action member (5), characterized in that: The conveying assembly (1) is provided with a heat shield (2), the rolling action member (5) is provided at both ends of the heat shield (2), and the heat shield (2) is provided with a temperature sensing structure (4), a temperature control assembly control (3) and a transverse water pipe (6); The continuous rolling production line is also provided with a water circulation module corresponding to the transverse water pipe (6), and the dynamic heat exchange control system integrates the water circulation module, the temperature measurement sensor structure (4) and the temperature control assembly control (3) to adopt a variable temperature intervention action; In the variable temperature intervention action, the temperature parameters in the heat shield (2) and the action parameters during the rolling of the aluminum alloy bar are obtained through the temperature sensing structure (4), and a temperature drop coefficient model is established with the temperature parameters and the action parameters. The heat dissipation coefficient of the aluminum alloy bar rolling is obtained in the temperature drop coefficient model. Finally, a temperature threshold set is proposed for the temperature drop coefficient model based on the rolling action part (5), and an action instruction is output to the water circulation module with the temperature threshold set and the heat dissipation coefficient. The water circulation module is intervened by the action instruction.

2. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 1, characterized in that: The transverse water pipe (6) is arranged along the length direction of the heat insulation cover (2), and the direction of water flow in the transverse water pipe (6) is opposite to the conveying direction of the aluminum alloy bar in the conveying assembly (1).

3. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 1, characterized in that: The temperature drop coefficient model is expressed as , including the cooldown period , aluminum alloy bar density Specific heat capacity of aluminum alloy bars , thermal conductivity of aluminum alloy bars , initial temperature of aluminum alloy bar , external ambient temperature and target temperature , and set the cooling time to a constant value in the temperature drop coefficient model.

4. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 3, characterized in that: According to the setting position of the temperature sensing structure (4) and the conveying direction of the aluminum alloy bar, the initial temperature of the aluminum alloy bar is Subdivided 、 , 、 Respectively represent the starting temperature and the temperature after heat exchange in a certain section of the continuous production line, with ( - ) / Indicates the heat dissipation coefficient.

5. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 1, characterized in that: Set the association according to the setting position of the rolling action part (5) 、 Temperature threshold set 、 , the target temperature in the temperature drop coefficient model Set according to the temperature threshold set and is a relative constant.

6. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 1, characterized in that: The water circulation module includes a water pump and a water source box. The water source box is used to provide a cooling water source. The water pump is used to pump the cooling water into the transverse water pipe (6) from left to right. The water inlet temperature measuring point and the water outlet temperature measuring point are respectively set at the position of the transverse water pipe (6) corresponding to the rolling action part (5). by 、 Indicates the water temperature at the inlet and outlet temperature measurement points, and simultaneously establishes 、 The heat balance formula , and simultaneously establish the heat conversion formula between the heat transferred by aluminum alloy bars and the temperature difference .

7. The dynamic heat exchange control system for continuous casting and rolling of aluminum alloy bars according to claim 6, characterized in that: In the heat balance formula, Reflects the flow rate of cooling water in the horizontal water pipe (6), and pre-sets the target temperature in the temperature drop coefficient model according to the temperature threshold set , and the target temperature Substitute into the temperature drop coefficient model to get the external ambient temperature ; Substitute the external ambient temperature into the heat balance formula and get , and generates a conversion method between the flow rate of the cooling water in the transverse water pipe (6) and the target temperature, thereby controlling the flow rate of the cooling water in the transverse water pipe (6) and forming a dynamic heat exchange environment inside the heat insulation cover (2).

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