Temperature control system and method

Abstract

The present invention provides a temperature control system and method, comprising a transmission control module, a data acquisition module, a temperature adjustment module, and at least two temperature acquisition modules. Each temperature acquisition module comprises a thermocouple and a transmission device, wherein the thermocouple is fixed to the movable end of the transmission device. A first thermocouple passes through a detection hole of an upper heater in a smelting furnace and moves in a first direction perpendicular to the direction of movement of the casting under the drive of the first transmission device. A second thermocouple passes through a detection hole of a lower heater in the smelting furnace and moves in a second direction perpendicular to the direction of movement of the casting under the drive of the second transmission device. The data acquisition module is connected to the first and second thermocouples, respectively. The temperature adjustment module is connected to the data acquisition module, the upper heater, and the lower heater, respectively. The transmission control module is connected to the first and second transmission devices, respectively. This system can effectively control the temperature field within the heaters, which is more conducive to the production of single crystals.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment manufacturing, and in particular to a temperature control system and method. Background Art

[0002] With the development of gas turbine engines and the continuous increase in gas turbine inlet temperatures, single crystal high-temperature alloy castings have become increasingly widely used as key components of aircraft engines due to their improved high-temperature resistance. During the casting manufacturing process, the directional solidification process of the casting takes a long time. As the casting shell gradually moves out of the heater, the temperature field in the heater needs to be monitored and controlled. The current common temperature control method for vacuum melting furnaces is to insert thermocouples from the outside of the upper and lower heaters into the inner wall, and adjust the heater power in real time according to the thermocouple temperature measurement results to achieve temperature control. This temperature control method cannot meet the temperature field requirements during single crystal generation, especially when the insulation efficiency of the baffle becomes increasingly low in the later stages of directional solidification. Summary of the Invention

[0003] In order to solve the problem in the prior art that the temperature inside the heater is not timely controlled and cannot meet the temperature field requirements, the present invention provides a temperature control system and method, which has the characteristics of effectively controlling the temperature field inside the heater during the entire directional solidification process, which is conducive to the formation of single crystals.

[0004] A temperature control system provided according to a specific embodiment of the present invention includes: a transmission control module, a data acquisition module, a temperature adjustment module and at least two temperature acquisition modules;

[0005] Each of the temperature acquisition modules includes: a thermocouple and a transmission device, wherein the thermocouple is fixed to a movable end of the transmission device, wherein a first thermocouple passes through a detection hole of an upper heater in the smelting furnace and moves in a first direction perpendicular to the moving direction of the casting under the drive of the first transmission device, and a second thermocouple passes through a detection hole of a lower heater in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting under the drive of the second transmission device;

[0006] The data acquisition module is connected to the first thermocouple and the second thermocouple respectively;

[0007] The temperature adjustment module is connected to the data acquisition module, the upper heater and the lower heater respectively, and is used to adjust the power of the upper heater and the lower heater based on the temperature value of the first thermocouple and the temperature value of the second thermocouple collected by the data acquisition module;

[0008] The transmission control module is connected to the first transmission device and the second transmission device respectively, and is used to ensure that the first distance from the first thermocouple to the casting surface and the second distance from the second thermocouple to the casting surface are maintained within corresponding preset ranges during the movement of the casting.

[0009] Furthermore, each of the thermocouples includes a thermocouple wire and a ceramic tube, wherein the thermocouple wire is arranged in the ceramic tube, the ceramic tube is fixed on the movable end of the transmission device, and at least a portion of the ceramic tube extends into the smelting furnace.

[0010] Furthermore, the preset ranges corresponding to the first distance and the second distance are respectively between 6 cm and 8 cm.

[0011] Furthermore, each of the transmission devices includes: a screw, a motor and a screw seat, the screw is arranged on the screw seat, one end of the screw is connected to the motor in a transmission manner, the thermocouple is fixed on the other end of the screw, and the motor is connected to the transmission control module.

[0012] Further, an extension line of the first thermocouple along the first direction passes through the center of the upper heater, and an extension line of the second thermocouple along the second direction passes through the center of the lower heater.

[0013] Furthermore, the data acquisition module includes a temperature recorder with a data acquisition frequency of at least 1 time / second.

[0014] Furthermore, the temperature control system also includes: at least two distance measuring modules connected to the transmission control module, wherein the first distance measuring module measures the third distance from the casting to the smelting furnace wall through the detection hole of the upper heater, and the second distance measuring module measures the fourth distance from the casting to the smelting furnace wall through the detection hole of the lower heater.

[0015] A temperature control method provided according to a specific embodiment of the present invention is applied to a temperature control system, the temperature control system comprising: a transmission control module, a data acquisition module, a temperature adjustment module, and at least two temperature acquisition modules; each of the temperature acquisition modules comprising: a thermocouple and a transmission device, the thermocouple being fixed to a movable end of the transmission device, wherein a first thermocouple passes through a detection hole of an upper heater in a smelting furnace and moves in a first direction perpendicular to the moving direction of the casting under the drive of the first transmission device, and a second thermocouple passes through a detection hole of a lower heater in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting under the drive of the second transmission device; the data acquisition module is connected to the first thermocouple and the second thermocouple respectively; the temperature adjustment module is connected to the data acquisition module, the upper heater, and the lower heater respectively; the transmission control module is connected to the first transmission device and the second transmission device respectively, and the method comprises:

[0016] The transmission control module determines the movement distance of each thermocouple during the movement of the casting based on a preset correspondence between the movement distance of the casting and the movement distance of each thermocouple, so that a first distance from the first thermocouple to the surface of the casting and a second distance from the second thermocouple to the surface of the casting are both maintained within corresponding preset ranges;

[0017] The temperature adjustment module adjusts the power of the upper heater and the lower heater based on the temperature value of the first thermocouple and the temperature value of the second thermocouple collected by the data collection module.

[0018] Furthermore, the preset ranges corresponding to the first distance and the second distance are respectively between 6 cm and 8 cm.

[0019] The temperature control system and method provided by the present invention may include a transmission control module, a data acquisition module, a temperature adjustment module, and at least two temperature acquisition modules. Each temperature acquisition module includes a thermocouple and a transmission device. The thermocouple is fixed to the movable end of the transmission device. A first thermocouple passes through a detection hole of an upper heater in a smelting furnace and moves in a first direction perpendicular to the direction of movement of the casting under the drive of the first transmission device. A second thermocouple passes through a detection hole of a lower heater in the smelting furnace and moves in a second direction perpendicular to the direction of movement of the casting under the drive of the second transmission device. The data acquisition module is connected to the first thermocouple and the second thermocouple, respectively. The temperature adjustment module is connected to the data acquisition module, the upper heater, and the lower heater, respectively, and is configured to adjust the power of the upper heater and the lower heater based on the temperature values ​​of the first thermocouple and the second thermocouple collected by the data acquisition module. The transmission control module is connected to the first transmission device and the second transmission device, respectively, and is configured to maintain a first distance from the first thermocouple to the casting surface and a second distance from the second thermocouple to the casting surface within corresponding preset ranges during the movement of the casting. This temperature control system and method can better monitor the temperature of the casting surface during the directional solidification process of the casting, and can adjust the power of the heater according to the real-time temperature, effectively controlling the temperature field inside the heater, which is more conducive to the generation of single crystals in the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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 merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 is a structural diagram of a temperature control system provided according to an exemplary embodiment;

[0022] Figure 2 is a flow chart of a temperature control method provided according to an exemplary embodiment;

[0023] Figure 3 is a structural diagram of a casting provided according to an exemplary embodiment. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Reference Figure 1 As shown, an embodiment of the present invention provides a temperature control system, which may include: a transmission control module 3, a data acquisition module 4, a temperature adjustment module 5 and at least two temperature acquisition modules.

[0026] Each temperature acquisition module includes: a thermocouple 1 and a transmission device 2, wherein the thermocouple 1 is fixed to the movable end of the transmission device, wherein the first thermocouple passes through the detection hole of the upper heater 6 in the smelting furnace and moves in a first direction perpendicular to the moving direction of the casting 8 under the drive of the first transmission device, and the second thermocouple passes through the detection hole of the lower heater 7 in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting 8 under the drive of the second transmission device.

[0027] The data acquisition module 4 is connected to the first thermocouple and the second thermocouple respectively.

[0028] The temperature adjustment module 5 is connected to the data acquisition module 4 , the upper heater 6 and the lower heater 7 respectively, and is used to adjust the power of the upper heater 6 and the lower heater 7 based on the temperature values ​​of the first thermocouple and the second thermocouple collected by the data acquisition module 4 .

[0029] The transmission control module 3 is connected to the first transmission device and the second transmission device respectively, and is used to keep the first distance from the first thermocouple to the surface of the casting 8 and the second distance from the second thermocouple to the surface of the casting 8 within the corresponding preset range during the movement of the casting 8.

[0030] Specifically, the transmission control module 3, data acquisition module 4, and temperature adjustment module 5 can all be located outside the vacuum melting furnace. The transmission control module 3 is connected to the transmission device 2 via wires, and the data acquisition module 4 is connected to the thermocouple via wires. Due to the characteristics of the directional solidification process for single crystal castings, the power of the upper heater 6 and the lower heater 7 needs to be adjusted when the casting 8 moves vertically in the melting furnace.

[0031] Each thermocouple 1 is composed of a thermocouple wire and a ceramic tube. The thermocouple wire is arranged in the ceramic tube. The ceramic tube is fixed on the movable end of the transmission device 2. At least part of the ceramic tube extends into the smelting furnace. Each transmission device may include a screw, a motor and a screw seat. The screw is arranged on the screw seat. The screw seat can be fixed on the outer wall or the inner wall of the smelting furnace. One end of the screw is connected to the motor transmission. The thermocouple 1 is fixed on the other end of the screw. The motor is connected to the transmission control module 3. The transmission control module 3 can control the motor such as a stepper motor and a servo motor to control the rotation direction and number of turns of the screw, thereby realizing the control of the telescopic distance of the thermocouple on the screw in the heater. When the casting 8 moves downward, the extension distance of a thermocouple can be corresponding to the distance each time the casting 8 moves. For example, when the casting 8 is still in the upper heater, the extension distance of the first thermocouple can be controlled according to the pre-set corresponding relationship each time the casting 8 moves downward. For example, if the casting 8 is as follows Figure 1 When the shape is shown in , the extension distance of the first thermocouple in the upper heater 6 can be controlled according to the preset extension distance during the downward movement of the casting 8, so that the distance from the first thermocouple to the casting 8 is maintained within a preset range, and the second thermocouple in the lower heater 7 can remain stationary. When the casting 8 descends to a preset height, the second thermocouple is similarly controlled to extend according to the preset setting without moving the first thermocouple.

[0032] Then the temperature regulating module 5 adjusts the power of the heaters according to the temperature values ​​of the upper and lower heaters collected by the data collecting module 4, thereby making the temperature fields in the upper and lower heaters more suitable for the formation of single crystals during the directional solidification process of the casting.

[0033] It is understandable that the extension distance or shortening distance of the first thermocouple and the second thermocouple as the casting 8 moves can be set accordingly according to the shape of the casting, and the present invention does not impose any limitation thereto.

[0034] Of course, the transmission device 2 can also use an adjustment device with controllable telescopic distance, such as a hydraulic device, to control the telescopic extension of the thermocouple, and the present invention does not limit this.

[0035] As a feasible implementation of the above embodiment, the preset ranges corresponding to the first distance and the second distance are generally between 6 cm and 8 cm. That is, the distance between the two thermocouples 1 and the casting surface is always controlled within the range of 6 cm to 8 cm during the expansion and contraction process, which can make the measured temperature value more accurate and reliable.

[0036] The extension line of the first thermocouple along the first direction passes through the center of the upper heater 6, and the extension line of the second thermocouple along the second direction passes through the center of the lower heater 7. Figure 1As shown, the detection hole on the cross section at the center of the heater is generally used as the telescopic position of the thermocouple, so that it can be telescoped along the radial direction of the heater.

[0037] In some specific embodiments of the present invention, the data acquisition module 4 may include a temperature recorder with a data acquisition frequency of at least 1 time per second.

[0038] In order to further optimize this technical solution, if conditions permit, at least two distance measuring modules connected to the transmission control module 3 can be set up, wherein the first distance measuring module measures the third distance from the casting to the smelting furnace wall through the detection hole of the upper heater 6, and the second distance measuring module measures the fourth distance from the casting to the smelting furnace wall through the detection hole of the lower heater 7.

[0039] The distance from the melting furnace wall to the casting is measured by equipment such as a laser rangefinder. The measured value can be used as an auxiliary judgment value for the transmission control module to determine the telescopic distance of the thermocouple, allowing for more precise control of the telescopic distance, making the measurement results more accurate and reliable.

[0040] Reference Figure 2 As shown, an embodiment of the present invention further provides a temperature control method, which can be applied to the above-mentioned temperature control system. The temperature control system includes: a transmission control module 3, a data acquisition module 4, a temperature adjustment module 5 and at least two temperature acquisition modules; each temperature acquisition module includes: a thermocouple 1 and a transmission device 2, the thermocouple is fixed to the movable end of the transmission device 2, wherein the first thermocouple passes through the detection hole of the upper heater 6 in the smelting furnace and moves in a first direction perpendicular to the moving direction of the casting 8 under the drive of the first transmission device, and the second thermocouple passes through the detection hole of the lower heater 7 in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting 8 under the drive of the second transmission device. The data acquisition module 4 is connected to the first thermocouple and the second thermocouple respectively. The temperature adjustment module 5 is connected to the data acquisition module 4, the upper heater 6 and the lower heater 7 respectively. The transmission control module 3 is connected to the first transmission device and the second transmission device respectively. The method may include the following steps:

[0041] 201. The transmission control module determines the movement distance of each thermocouple during the movement of the casting based on a preset correspondence between the movement distance of the casting and the movement distance of each thermocouple, so that a first distance from the first thermocouple to the surface of the casting and a second distance from the second thermocouple to the surface of the casting are both maintained within corresponding preset ranges. The first distance from the first thermocouple to the surface of the casting and the second distance from the second thermocouple to the surface of the casting are both maintained between 6 cm and 8 cm.

[0042] 202. The temperature adjustment module adjusts the power of the upper heater and the lower heater based on the temperature value of the first thermocouple and the temperature value of the second thermocouple collected by the data collection module.

[0043] As a specific implementation of the above embodiment, refer to Figure 3 The figure shows a detailed structural diagram of a casting, where the lengths of various components are in mm. In practical applications, the centerline 301 of the casting coincides with the centerlines of the upper and lower heaters. To facilitate control of thermocouple operation, the distance between the thermocouples and centerline 301 can be used as a guide to adjust the distance between the thermocouples and the casting surface. For example, if the first thermocouple is at a height of 150 mm and the second thermocouple is at a height of 60 mm, when the casting is directionally solidified at a withdrawal rate of 3 mm / min, the thermocouple travel can be adjusted in the following stages: For the first thermocouple: At the start of directional solidification, the distance between the top end of the first thermocouple and the center of the heater is 200 mm. From 0 to 18.3 minutes of directional solidification, the top end of the first thermocouple approaches the center of the heater at a rate of 1.1 mm / min. From 18.3 minutes to the end of directional solidification, the distance between the top end of the first thermocouple and the center of the heater is fixed at 180 mm.

[0044] Second thermocouple: From 0 to 6.7 minutes of directional solidification, the distance between the upper end of the second thermocouple and the center of the heater is fixed at 180 mm. From 6.7 to 22 minutes of directional solidification, the upper end of the second thermocouple moves away from the center of the heater at a rate of 2 mm / min. From 22 to 48.3 minutes of directional solidification, the upper end of the second thermocouple moves toward the center of the heater at a rate of 1.1 mm / min. From 48.3 minutes of directional solidification until the end of directional solidification, the distance between the upper end of the second thermocouple and the center of the heater is fixed at 180 mm.

[0045] It is understandable that those skilled in the art may adjust the moving distance and direction of the thermocouples at each stage according to the actual needs of the casting, and the present invention does not impose any limitation thereto.

[0046] The specific implementation process of the temperature control method can refer to the embodiment of the temperature control system mentioned above, and the present invention will not be repeated here.

[0047] The temperature control system and method provided by the above-described embodiments of the present invention can more accurately monitor the outer surface temperature of the casting and optimize the temperature field within the heater. They can also increase the temperature gradient at the solid-liquid interface within the casting, thereby improving the surface integrity of single-crystal high-temperature alloy castings.

[0048] For simplicity of description, the aforementioned method embodiments are described as a series of actions. However, those skilled in the art should be aware that the present invention is not limited by the order of the actions described, as certain steps can be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also be aware that the embodiments described in this specification are preferred embodiments, and the actions and modules involved are not necessarily required for the present invention.

[0049] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similarities between the various embodiments can be referred to in conjunction with each other. For device embodiments, since they are generally similar to method embodiments, their description is relatively simple, and for relevant details, reference can be made to the description of the method embodiments.

[0050] The steps in the methods of the various embodiments of the present invention can be adjusted in sequence, combined, and deleted according to actual needs, and the technical features recorded in the various embodiments can be replaced or combined.

[0051] The modules and submodules in the devices and terminals of various embodiments of the present invention may be combined, divided, or deleted according to actual needs.

[0052] In the several embodiments provided herein, it should be understood that the disclosed terminals, devices, and methods can be implemented in other ways. For example, the terminal embodiments described above are merely illustrative. For example, the division of modules or submodules is merely a logical functional division. In actual implementation, other division methods may be used, such as combining or integrating multiple submodules or modules into another module, or omitting or not implementing certain features. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or modules via some interface, which may be electrical, mechanical, or other forms.

[0053] The modules or submodules described as separate components may or may not be physically separate, and the components of the modules or submodules may or may not be physical modules or submodules, that is, they may be located in one place or distributed across multiple network modules or submodules. Some or all of the modules or submodules may be selected to achieve the purpose of this embodiment according to actual needs.

[0054] In addition, the functional modules or submodules in the various embodiments of the present invention may be integrated into a single processing module, or each module or submodule may exist physically separately, or two or more modules or submodules may be integrated into a single module. The aforementioned integrated modules or submodules may be implemented in the form of hardware or software functional modules or submodules.

[0055] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0056] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, software units executed by a processor, or a combination of the two. The software units may be placed in random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0057] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0058] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one 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 limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature control system, characterized in that: include: Transmission control module, data acquisition module, temperature adjustment module and at least two temperature acquisition modules; Each of the temperature acquisition modules includes: a thermocouple and a transmission device, wherein the thermocouple is fixed to a movable end of the transmission device, wherein a first thermocouple passes through a detection hole of an upper heater in the smelting furnace and moves in a first direction perpendicular to the moving direction of the casting under the drive of the first transmission device, and a second thermocouple passes through a detection hole of a lower heater in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting under the drive of the second transmission device; The data acquisition module is connected to the first thermocouple and the second thermocouple respectively; The temperature adjustment module is connected to the data acquisition module, the upper heater and the lower heater respectively, and is used to adjust the power of the upper heater and the lower heater based on the temperature value of the first thermocouple and the temperature value of the second thermocouple collected by the data acquisition module; The transmission control module is connected to the first transmission device and the second transmission device respectively, and is used to determine the movement distance of each thermocouple during the movement of the casting based on the preset correspondence between the casting movement distance and the movement distance of each thermocouple, so that the first distance from the first thermocouple to the casting surface and the second distance from the second thermocouple to the casting surface are maintained within the corresponding preset range during the movement of the casting.

2. The system according to claim 1, wherein: Each of the thermocouples includes a thermocouple wire and a ceramic tube. The thermocouple wire is arranged in the ceramic tube. The ceramic tube is fixed on the movable end of the transmission device. At least a portion of the ceramic tube extends into the smelting furnace.

3. The system according to claim 1, wherein: The preset ranges corresponding to the first distance and the second distance are respectively between 6 cm and 8 cm.

4. The system according to claim 1, wherein: Each of the transmission devices includes: a screw, a motor and a screw seat, the screw is arranged on the screw seat, one end of the screw is connected to the motor in a transmission manner, the thermocouple is fixed on the other end of the screw, and the motor is connected to the transmission control module.

5. The system according to claim 1, wherein: An extension line of the first thermocouple along the first direction passes through the center of the upper heater, and an extension line of the second thermocouple along the second direction passes through the center of the lower heater.

6. The system according to claim 1, wherein: The data acquisition module includes a temperature recorder with a data acquisition frequency of at least 1 time per second.

7. The system according to claim 1, wherein: Also includes: At least two distance measuring modules are connected to the transmission control module, wherein the first distance measuring module measures a third distance from the casting to the smelting furnace wall through the detection hole of the upper heater, and the second distance measuring module measures a fourth distance from the casting to the smelting furnace wall through the detection hole of the lower heater.

8. A temperature control method, characterized in that: Applied to a temperature control system, the temperature control system includes: a transmission control module, a data acquisition module, a temperature adjustment module and at least two temperature acquisition modules; each of the temperature acquisition modules includes: a thermocouple and a transmission device, the thermocouple is fixed to the movable end of the transmission device, wherein the first thermocouple passes through the detection hole of the upper heater in the smelting furnace and moves in a first direction perpendicular to the moving direction of the casting under the drive of the first transmission device, and the second thermocouple passes through the detection hole of the lower heater in the smelting furnace and moves in a second direction perpendicular to the moving direction of the casting under the drive of the second transmission device; the data acquisition module is respectively connected to the first thermocouple and the second thermocouple; the temperature adjustment module is respectively connected to the data acquisition module, the upper heater and the lower heater; the transmission control module is respectively connected to the first transmission device and the second transmission device, and the method includes: The transmission control module determines the movement distance of each thermocouple during the movement of the casting based on a preset correspondence between the movement distance of the casting and the movement distance of each thermocouple, so that a first distance from the first thermocouple to the surface of the casting and a second distance from the second thermocouple to the surface of the casting are both maintained within corresponding preset ranges; The temperature adjustment module adjusts the power of the upper heater and the lower heater based on the temperature value of the first thermocouple and the temperature value of the second thermocouple collected by the data collection module.

9. The method according to claim 8, characterized in that The preset ranges corresponding to the first distance and the second distance are respectively between 6 cm and 8 cm.

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