A continuous vacuum brazing furnace and a working method thereof

Abstract

The application discloses a continuous vacuum brazing furnace and a working method thereof. The vacuum brazing furnace comprises a feeding chamber, a heating chamber, a cooling chamber and a rack. The feeding chamber, the heating chamber and the cooling chamber are sequentially connected. The rack can move in the heating chamber. The heating chamber is provided with a heating system and a field reflection screen system. The heating system heats workpieces on the rack. The field reflection screen system comprises a control center and a reflection screen unit. The reflection screen unit is arranged on both sides of a moving path of the rack and is arranged in a row on each side. The reflection screen unit comprises a reflection screen, a rotating shaft and a driving device. The reflection screen is mounted on the rotating shaft, and the rotating shaft is mounted on a bottom plate of the heating chamber. The driving device comprises a driving motor and a driving control part. The driving motor drives the rotating shaft to rotate at an arbitrary angle under the control of the driving control part, so that the reflection screen is adjusted in a working posture. The application can improve temperature uniformity and temperature control response speed in vacuum brazing production.

Description

Technical Field

[0001] This invention relates to the field of vacuum brazing technology, and in particular to a continuous vacuum brazing furnace and its operating method. Background Technology

[0002] Vacuum brazing equipment is widely used in high-end manufacturing fields such as automotive, aerospace, and new energy due to its strong adaptability in practical applications. To meet the demands of modern high-volume, high-efficiency production, continuous vacuum brazing furnaces have been gradually developed in recent years based on traditional intermittent vacuum brazing equipment. These furnaces enable continuous loading and unloading of workpieces, continuous heating and welding, and are particularly suitable for industrial production scenarios with high-volume, high-quality requirements due to their significant advantages such as high efficiency, high consistency, energy saving, and clean and environmentally friendly operation.

[0003] Temperature uniformity within the working area is a core performance indicator of continuous vacuum brazing furnaces, directly determining the consistency of welding quality, product yield, and process repeatability. In existing continuous vacuum brazing furnaces, the working area of ​​the heating chamber (especially in the material rack travel direction) is often large. To control the temperature uniformity within this large working area, the heating system mostly adopts a multi-zone temperature control method. However, in actual operation, due to the thermal coupling effect between different temperature zones and the lag effect in temperature control response caused by the thermal inertia of the heating elements, local temperatures may still be too high or too low within the working area. Because of these factors, in actual production, it is often necessary to increase the heating power and extend the holding time to ensure the brazing quality of workpieces in the low-temperature areas, which adversely affects the energy utilization and work efficiency of vacuum brazing production. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a continuous vacuum brazing furnace and its operating method to improve temperature uniformity and temperature control response speed in vacuum brazing production.

[0005] In a first aspect, the present invention provides a continuous vacuum brazing furnace. The continuous vacuum brazing furnace includes a feeding chamber, a heating chamber, a cooling chamber, and a material rack. The feeding chamber, heating chamber, and cooling chamber are sequentially connected. The material rack can travel within the heating chamber. A heating system and a field-type reflector system are provided within the heating chamber. The heating system heats the workpieces on the material rack using a multi-zone temperature control method. The heating system includes heaters. Multiple position sensors and multiple temperature measuring points are provided along the material rack's travel path within the heating chamber, and temperature measuring devices are installed at each temperature measuring point. The field-type reflector system includes a control center and several reflector units. The control center is located outside the heating chamber. The reflector units are arranged on both sides of the material rack's travel path, forming a row on each side, constituting a first reflector sequence. Each reflector unit includes a reflector, a rotating shaft, and a drive device. The reflector is mounted on the rotating shaft, and the reflective surface of the reflector is symmetrical about the axis of the rotating shaft. The lower end of the rotating shaft is mounted on the bottom plate of the heating chamber. The drive device includes a drive motor and a drive control unit. The drive motor is mounted on one end of the rotating shaft and is used to drive the shaft to rotate at any angle under the control of the drive control unit, thereby adjusting the working posture of the reflector. The drive control unit is used to receive control commands from the control center.

[0006] In one possible implementation, the drive control unit is also used to control the output rotation angle of the drive motor according to control commands. The control center sends independent control commands to each reflector unit in real time, and the reflectors in each reflector unit make independent dynamic real-time working posture adjustments according to the control commands, and perform field thermal reflection work with the adjusted target working posture.

[0007] In one possible implementation, the number of reflective screen units is 2n, and the number of temperature measuring devices is not less than 3n.

[0008] In one possible implementation, a purging device is provided at both ends of the reflective screen; the purging device can purge the reflective surface of the reflective screen, and remove the volatiles that fall on the reflective surface in a timely manner, so as to keep the reflective surface clean and keep its reflectivity stable.

[0009] In one possible implementation, a second reflective screen sequence is also provided outside the first reflective screen sequence, and the second reflective screen sequence includes several fixed reflective screens. The fixed reflective screens are arranged alternately with the reflective screen units in the first reflective screen sequence to reduce heat loss inside the heating chamber.

[0010] In one possible implementation, isolation valves are provided between the feeding chamber and the heating chamber, as well as between the heating chamber and the cooling chamber.

[0011] Secondly, the present invention provides a method for operating a continuous vacuum brazing furnace as described above. This method includes: S1, a material rack containing workpieces undergoes a preheating process in the feeding chamber; S2, after the preheating process, the material rack enters the heating chamber for a vacuum brazing process; the heating chamber operates in a vacuum environment isolated from the atmosphere; S3, after the vacuum brazing process, the material rack enters the cooling chamber for cooling. In step S2, the control center sends independent control commands to each reflector unit in real time, and the drive control unit controls the output rotation angle of the drive motor according to the control commands, causing the reflector to perform independent dynamic real-time working posture adjustments, and implementing field-type thermal reflection work in the adjusted target working posture.

[0012] In one possible implementation, the rack has a reference area surface, the length and width of which are aligned with the length and height of the rack, respectively. The reference area surface has a centerline perpendicular to the travel path. The reference area surface is axially symmetric about its centerline. At any given moment while the rack is traveling within the heating chamber, the reflector in the target working posture satisfies the following condition: the projection of the centerline of the nearest area surface onto the reflector falls on the axis of rotation of the reflector.

[0013] In one possible implementation, the number of reference regions is 2-10, and there is no intersection between different reference regions.

[0014] In one possible implementation, the position sensing devices transmit the position information of the material rack along the travel path to the control center in real time. The control center has preset material rack parameters, including material rack shape information and reference area surface information. Based on the position information sent by each position sensing device and in conjunction with the material rack parameters, the control center derives control commands for each reflector unit and sends these control commands to each reflector unit.

[0015] In one possible implementation, each temperature measuring device sends its temperature signal from its measuring point to the control center in real time. The control center uses these signals to generate temperature field information within the heating chamber, performs comprehensive analysis based on this information, derives control commands for each reflector unit, and sends these commands to each reflector unit. A reflector in its target working posture satisfies the following condition: the normal to its reflective surface is oriented to varying degrees towards the temperature field trough closest to the reflector.

[0016] In one possible implementation, the degree to which the normal of the reflective surface of the reflective screen in the target working posture is oriented toward a nearby temperature field trough is correlated with the gradient of the temperature signal of the adjacent temperature measuring point directly opposite the reflective screen unit in the direction toward the temperature field trough.

[0017] In one possible implementation, when a reflector is in the target working posture, the angle θi between the normal of the reflector surface and the plane passing through the axis of rotation of the reflector and the temperature measuring point located at the nearest temperature field trough satisfies the following relationship: cosθi=C0+C1·|Gi|-C2·di. C0, C1, and C2 are calibration coefficients related to the structural dimensions of the heating chamber and the reflectivity of the reflector surface. i is the number of the reflector. Gi is the comprehensive temperature gradient, used to characterize the overall cooling gradient trend of the three adjacent temperature measuring points directly opposite the reflector unit along the direction towards the temperature field trough. di is the straight-line distance from the axis of rotation of the reflector to the center of the nearest temperature field trough. Wherein, Gi=((Ti2-Ti1) / (x2-x1)+(Ti3-Ti2) / (x3-x2)) / 2. x1, x2, and x3 are the position coordinates of the three adjacent temperature measuring points directly opposite the reflector unit along the material rack travel direction. Ti3, Ti2, and Ti1 are the real-time temperature signals corresponding to the three temperature measurement points, respectively.

[0018] The applicant discovered that in existing continuous vacuum brazing furnaces employing multi-zone independent temperature control heating, the factory temperature uniformity test results under empty furnace conditions are acceptable. However, during actual use under full load conditions, the coupling of heat conduction and radiation between different temperature zones makes it difficult to decouple the coupled thermal interference between the multiple temperature zones. This leads to large fluctuations in the overall temperature field and slow temperature field control response. Furthermore, localized temperature deviations (too low or too high) are prone to occur at the boundaries between temperature zones. When conducting densely distributed multi-point temperature measurements of the working area, it was found that this temperature unevenness can reach ±10℃ or more in severe cases. Moreover, due to the monotonicity of the control, multi-zone independent temperature control technology alone cannot completely solve this problem.

[0019] The beneficial effects of this invention are: This invention utilizes a field-type reflective screen system to redistribute existing heat within the heating chamber, creating a reflective heat field that can be dynamically adjusted in real time based on the movement position of the material rack and / or the temperature field distribution within the working area. This reflective heat field, combined with multi-zone temperature control heating methods, compensates for the inherent monotony of multi-zone temperature control heating methods alone through the coupling and superposition of the reflective heat field and the heater's heating heat field. It eliminates the localized high or low temperature phenomena present in existing vacuum brazing furnaces with large working areas, improves the temperature field control response speed, and enhances heating efficiency and energy efficiency ratio.

[0020] In addition, the purging function of the purging device in this invention is closely integrated with the overall function of the field reflector system, which can keep the reflectivity of the reflective surface stable, thereby ensuring that the field reflector system can efficiently and dynamically adjust the temperature field and improve the response speed of the temperature field to this dynamic adjustment.

[0021] The applicant conducted densely distributed multi-point temperature measurements on the heating chamber of the continuous vacuum brazing furnace of this invention under operating conditions. The results showed that the temperature control response speed within the working area was improved by more than 50%, temperature uniformity reached within ±1℃, and there were no significant localized high or low temperatures within the temperature zone. With such excellent temperature control, the temperature control margin set in existing technologies to accommodate localized low temperatures can be reduced or even eliminated, and the extended holding time required to mitigate localized temperature dips can be shortened. Experimental tests show that this invention improves the energy efficiency ratio of the continuous vacuum brazing furnace by more than 30%, significantly reducing daily operating costs and improving production efficiency.

[0022] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0023] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a limitation of scale. Wherein: Figure 1 This is a schematic top view of a continuous vacuum brazing furnace provided in an embodiment of this application.

[0024] Figure 2 This is a top view schematic diagram provided in an embodiment of this application when the material rack enters the heating chamber.

[0025] Figure 3 This is a schematic diagram of the structure of a reflective screen unit provided in an embodiment of this application.

[0026] Figure 4 This is a schematic flowchart illustrating the working method of a continuous vacuum brazing furnace provided in an embodiment of this application.

[0027] Figure label: 10. Feeding room; 20, Heating chamber; 201, Heater; 202, Reflector unit; 2021, Reflector; 2022, Rotating shaft; 2023, Drive motor; 2024, Drive control unit; 2025, Axis; 203, Fixed reflector; 30. Cooling chamber; 40. Material rack; 50, Control Center; 60, Isolation valve. Detailed Implementation

[0028] The specific embodiments of the present invention are further described below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. In the following description, for ease of explanation, several details are used to provide a full understanding of the invention. However, the invention can still be practiced without these details. In other instances, well-known structures and apparatuses may be shown in a simplified manner to simplify the drawings.

[0029] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein.

[0030] In this invention, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and are not intended to limit the indicated device, element, or component to having a specific orientation, or to require it to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may have other meanings besides indicating orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0031] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] like Figure 1 , Figure 2 and Figure 3As shown, this application embodiment provides a continuous vacuum brazing furnace. The continuous vacuum brazing furnace includes a feeding chamber 10, a heating chamber 20, a cooling chamber 30, and a material rack 40. The feeding chamber 10, heating chamber 20, and cooling chamber 30 are sequentially connected. The material rack 40 can move within the heating chamber 20. A heating system and a field-type reflective screen system are installed within the heating chamber 20. The heating system heats the workpieces on the material rack 40 using multi-zone temperature control. The heating system includes heaters 201. Multiple position sensors and multiple temperature measuring points are installed on the material rack 40's movement path within the heating chamber 20, and temperature measuring devices are installed at each temperature measuring point. The field-type reflective screen system includes a control center 50 and several reflective screen units 202. The control center 50 is located outside the heating chamber 20. The reflective screen units 202 are arranged on both sides of the material rack 40's movement path, forming a row on each side, constituting a first reflective screen sequence. The reflective screen unit 202 includes a reflective screen 2021, a rotating shaft 2022, and a driving device. The reflective screen 2021 is mounted on the rotating shaft 2022, and the reflective surface of the reflective screen 2021 is symmetrical about the axis 2025 of the rotating shaft 2022. The lower end of the rotating shaft 2022 is mounted on the base plate of the heating chamber 20. The driving device includes a drive motor 2023 and a drive control unit 2024. The drive motor 2023 is located at one end of the rotating shaft 2022 and is used to drive the rotating shaft 2022 to rotate at any angle under the control of the drive control unit 2024, thereby causing the reflective screen 2021 to adjust its working posture. The drive control unit 2024 is used to receive control commands from the control center 50.

[0033] Figure 1 Specifically, this is a schematic diagram of a continuous vacuum brazing furnace before the material rack enters the heating chamber. Figure 2 Specifically, this is a schematic diagram of a continuous vacuum brazing furnace when the material rack has entered the heating chamber.

[0034] In one implementation, the drive control unit is also used to control the output rotation angle of the drive motor according to control commands. The control center sends independent control commands to each reflector unit in real time, and the reflectors in each reflector unit make independent dynamic real-time working posture adjustments according to the control commands, and perform field thermal reflection work with the adjusted target working posture.

[0035] In one implementation, the number of reflective screen units is 2n, and the number of temperature measuring devices is not less than 3n.

[0036] In one implementation, a purging device is provided at both ends of the reflective screen; the purging device is capable of purging the reflective surface of the reflective screen.

[0037] In one implementation, such as Figure 1 and Figure 2As shown, isolation valves 60 are provided between the feeding chamber 10 and the heating chamber 20, as well as between the heating chamber 20 and the cooling chamber 30.

[0038] In one implementation, such as Figure 1 and Figure 2 As shown, a second reflective screen sequence is also provided outside the first reflective screen sequence, and the second reflective screen sequence includes several fixed reflective screens 203. The fixed reflective screens 203 are arranged alternately with the reflective screen units 202 in the first reflective screen sequence.

[0039] like Figure 4 As shown in the embodiments of this application, a method for operating a continuous vacuum brazing furnace as described above is provided. This method includes: S1, the rack containing the workpiece undergoes a preheating process in the feeding chamber.

[0040] S2, after the preheating process is completed, the material rack enters the heating chamber for the vacuum brazing process; the heating chamber is in a vacuum environment isolated from the atmosphere during operation.

[0041] In step S2, the control center sends independent control commands to each reflector unit in real time. The drive control unit controls the output rotation angle of the drive motor according to the control commands, so that the reflector can make independent dynamic real-time working posture adjustment, and implement field thermal reflection work with the adjusted target working posture.

[0042] S3, After the vacuum brazing process is completed, the material rack enters the cooling chamber for cooling.

[0043] In one implementation, the rack has a reference area surface, the length and width of which are aligned with the length and height of the rack, respectively. The reference area surface has a centerline perpendicular to the travel path. The reference area surface is axially symmetric about its centerline. At any given moment while the rack is traveling within the heating chamber, the reflector in the target working posture satisfies the following condition: the projection of the centerline of the area surface closest to the reflector onto the reflector falls on the axis of rotation of the reflector.

[0044] In one implementation, the position sensing devices transmit the position information of the material rack along the travel path to the control center in real time. The control center has preset material rack parameters, including material rack shape information and reference area surface information. Based on the position information sent by each position sensing device and in conjunction with the material rack parameters, the control center derives control commands for each reflector unit and sends these control commands to each reflector unit.

[0045] In one implementation, each temperature measuring device sends its temperature signal from its measuring point to the control center in real time. The control center generates temperature field information within the heating chamber based on the temperature signals from each measuring point, performs comprehensive analysis based on this information, derives control commands for each reflector unit, and sends these commands to each reflector unit. A reflector in the target working posture satisfies the following condition: the normal to its reflective surface is oriented to varying degrees towards the temperature field trough closest to the reflector.

[0046] In one implementation, the degree to which the normal of the reflective surface of the reflective screen in the target working posture is oriented toward a nearby temperature field trough is correlated with the gradient of the temperature signal of the adjacent temperature measuring point directly opposite the reflective screen unit in the direction toward the temperature field trough.

[0047] In one implementation, when a reflector is in the target working posture, the angle θi between the normal of the reflector surface and the plane passing through the axis of rotation of the reflector and the temperature measuring point located at the nearest temperature field trough satisfies the following relationship: cosθi=C0+C1·|Gi|-C2·di. C0, C1, and C2 are calibration coefficients related to the structural dimensions of the heating chamber and the reflectivity of the reflector surface. i is the number of the reflector. Gi is the comprehensive temperature gradient, used to characterize the overall cooling gradient trend of the three adjacent temperature measuring points directly opposite the reflector unit along the direction towards the temperature field trough. di is the straight-line distance from the axis of rotation of the reflector to the center of the nearest temperature field trough. Wherein, Gi=((Ti2-Ti1) / (x2-x1)+(Ti3-Ti2) / (x3-x2)) / 2. x1, x2, and x3 are the position coordinates of the three adjacent temperature measuring points directly opposite the reflector unit along the material rack travel direction. Ti3, Ti2, and Ti1 are the real-time temperature signals corresponding to the three temperature measurement points, respectively.

[0048] In this embodiment of the application, in the scenario of dynamic temperature field changes in the heating chamber during the actual operation of the continuous vacuum brazing furnace, the control center can obtain the comprehensive temperature gradient Gi and the straight-line distance di from the axis of rotation of the reflector to the nearest temperature field trough center through the real-time temperature signal collected by the temperature measuring device. From this, the target attitude parameter θi of the reflector unit numbered i is obtained, and then the control command is sent to the drive control unit to drive the reflector to adjust to the target working attitude, realize the dynamic adaptation of heat reflection, and ensure the uniformity of the temperature field in the heating chamber.

[0049] In one implementation, C0, C1, and C2 are calibrated through debugging experiments of the heating chamber of a continuous vacuum brazing furnace. C0 ∈ (0, 1], C1 > 0, C2 > 0.

[0050] In one implementation, Ti3, Ti2, and Ti1 are represented by the unit K.

[0051] In one implementation, x1, x2, and x3 are in units of m, and x1 < x2 < x3.

[0052] In one implementation, the distance between two adjacent temperature measuring devices remains constant, i.e., x2-x1=x3-x2.

[0053] In one implementation, the unit of di is m.

[0054] In one implementation, θi∈[0, π / 2]. The smaller θi is, the stronger the orientation of the reflective surface normal towards the temperature field trough; the larger θi is, the weaker the orientation of the reflective surface normal towards the temperature field trough.

[0055] In one implementation, Gi is measured in K / m, and the larger the absolute value of |Gi|, the steeper the cooling trend along the direction towards the trough of the temperature field.

[0056] In one implementation, the number of reference regions is 2-10, and there is no intersection between different reference regions.

[0057] The embodiments of this application are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from their scope. The scope of the invention is limited only by the appended claims.

Claims

1. A continuous vacuum brazing furnace, characterized in that, include: The room consists of a feeding chamber, a heating chamber, a cooling chamber, and a material rack; the feeding chamber, heating chamber, and cooling chamber are connected in sequence. The material rack can move within the heating chamber; The heating chamber is equipped with a heating system and a field-type reflective screen system; the heating system heats the workpieces on the rack in a multi-zone temperature control manner; the rack is equipped with multiple position sensors and multiple temperature measuring points along its travel path in the heating chamber, and temperature measuring devices are installed at the temperature measuring points. The field-type reflective screen system includes a control center and several reflective screen units. The reflective screen units are arranged on both sides of the material rack travel path, forming a row on each side, constituting the first reflective screen sequence. Each reflective screen unit includes a reflective screen, a rotating shaft, and a drive device. The reflective screen is mounted on the rotating shaft, and the reflective surface of the reflective screen is symmetrical about the axis of the rotating shaft. The lower end of the rotating shaft is mounted on the bottom plate of the heating chamber. The drive device includes a drive motor and a drive control unit. The drive motor is located at one end of the rotating shaft and is used to drive the rotating shaft to rotate at any angle under the control of the drive control unit, thereby driving the reflective screen to adjust its working posture. The drive control unit is used to receive control commands from the control center.

2. The continuous vacuum brazing furnace according to claim 1, characterized in that, The number of reflective screen units is 2n, and the number of temperature measuring devices is not less than 3n.

3. The continuous vacuum brazing furnace according to claim 1, characterized in that, The reflective screen is equipped with a purging device at both ends; the purging device can purge the reflective surface of the reflective screen.

4. The continuous vacuum brazing furnace according to claim 1, characterized in that, A second reflective screen sequence is also provided outside the first reflective screen sequence. The second reflective screen sequence includes several fixed reflective screens. The fixed reflective screens are arranged alternately with the reflective screen units in the first reflective screen sequence.

5. A method for operating a continuous vacuum brazing furnace as described in any one of claims 1-4, characterized in that, include: S1, the rack containing the workpiece undergoes a preheating process in the feeding chamber; S2, After the preheating process is completed, the material rack enters the heating chamber for the vacuum brazing process; the heating chamber is in a vacuum environment isolated from the atmosphere during operation; S3, After the vacuum brazing process is completed, the material rack enters the cooling chamber for cooling; In step S2, the control center sends independent control commands to each reflector unit in real time. The drive control unit controls the output rotation angle of the drive motor according to the control commands, so that the reflector can make independent dynamic real-time working posture adjustment, and implement field thermal reflection work with the adjusted target working posture.

6. The operating method of the continuous vacuum brazing furnace according to claim 5, characterized in that, The material rack has a reference area surface, the length and width of which are aligned with the length and height of the material rack, respectively; the reference area surface has a center line perpendicular to the travel path; the reference area surface is symmetrical about the center line; at any moment when the material rack travels in the heating chamber, the reflector in the target working posture satisfies the following: the projection of the center line of the area surface closest to the reflector onto the reflector falls on the axis of the reflector's rotation.

7. The operating method of the continuous vacuum brazing furnace according to claim 6, characterized in that, The position sensing device sends the position information of the material rack on the travel path to the control center in real time; the control center has preset material rack parameters including material rack shape information and reference area surface information; based on the position information sent by each position sensing device and combined with the material rack parameters, the control center derives the control command for each reflector unit and sends the control command to each reflector unit.

8. The operating method of the continuous vacuum brazing furnace according to claim 5, characterized in that, Each temperature measuring device sends the temperature signal of its measuring point to the control center in real time; the control center forms temperature field information in the heating chamber based on the temperature signals of each measuring point, and performs comprehensive analysis based on the temperature field information to derive control commands for each reflector unit, and sends the control commands to each reflector unit; the reflector in the target working posture satisfies the following: the normal of the reflector surface of the reflector is oriented to different degrees toward the temperature field trough that is closer to the reflector.

9. The operating method of the continuous vacuum brazing furnace according to claim 8, characterized in that, The degree to which the normal of the reflective surface of the reflective screen in the target working posture is oriented toward a nearby temperature field trough is related to the gradient of the temperature signal of the adjacent temperature measuring point directly opposite the reflective screen unit in the direction of decreasing towards that temperature field trough.

10. The operating method of the continuous vacuum brazing furnace according to claim 9, characterized in that, When a reflector is in the target working posture, the angle θi between the normal of the reflector surface and the plane passing through the axis of rotation of the reflector and the temperature measuring point located at the nearest temperature field trough satisfies the following relationship: cosθi=C0+C1·∣Gi∣-C2·di; C0, C1, and C2 are calibration coefficients related to the structural dimensions of the heating chamber and the reflectivity of the reflective surface. i is the number of the reflective screen; Gi is the overall temperature gradient, used to characterize the overall cooling gradient trend of the three adjacent temperature measuring points directly opposite the reflector unit along the direction towards the valley of the temperature field. di is the straight-line distance from the axis of rotation of the reflector to the center of the nearest temperature field trough; Where Gi = ((Ti2-Ti1) / (x2-x1)+(Ti3-Ti2) / (x3-x2)) / 2; x1, x2, and x3 are the position coordinates of the three adjacent temperature measuring points directly opposite the reflective screen unit along the material rack traveling direction; Ti3, Ti2, and Ti1 are the real-time temperature signals corresponding to the three temperature measuring points.

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