Segmented cooling equipment for bottom guard plate

Abstract

The utility model discloses subsection cooling equipment for a bottom protective plate, which comprises a conveying device and a heating and cooling area which are arranged on a rack, and the heating and cooling area is provided with a heating area, a buffering area and a cooling area along the moving direction of the conveying device; the heating area comprises a first heating plate and a second heating plate which are oppositely arranged, the buffer area comprises a first buffer plate and a second buffer plate which are oppositely arranged, and the cooling area comprises a first cooling plate and a second cooling plate which are oppositely arranged. Thus, the buffer area is additionally arranged between the heating area and the cooling area, the effect of gradually reducing the temperature can be achieved, the temperature change of the bottom protection plate in the heating and cooling processes is effectively balanced, and the problems of plate deformation, warping or cracks and the like caused by stress concentration of the bottom protection plate due to too fast temperature change are solved; the heating plates, the buffer plates and the cooling plates are arranged on the two sides of the bottom protection plate, the temperature distribution of the bottom protection plate in the machining process is more uniform, and the deformation problem caused by temperature difference is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bottom guard plate manufacturing, in particular to a bottom guard plate segmented cooling device. Background Art

[0002] The power battery pack of new energy vehicles is generally placed on a tray on the vehicle chassis. In order to prevent the battery from being damaged by external forces, a bottom guard plate needs to be added to the bottom of the tray.

[0003] In the prior art, the bottom guard plate press used in the process of manufacturing the bottom guard plate is divided into only two zones, the heating zone (oil heating pipeline) and the cooling zone (hydrocondensate cooling pipeline), and only one temperature can be set in the cooling zone. Therefore, if the plate is to be cooled quickly, the temperature difference between the set temperature of the cooling zone and the temperature of the heating zone is too large, which will cause the plate to generate greater internal stress during the cooling process, causing the plate to deform, warp or crack, affecting the brittleness, toughness and flatness of the plate, thereby reducing the quality and performance of the product. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a bottom guard plate segmented cooling device.

[0005] The utility model provides a bottom guard plate segmented cooling device, comprising a frame, on which a conveying device and a heating and cooling zone are arranged, the conveying device is used to convey the bottom guard plate to the heating and cooling zone, and the heating and cooling zone is sequentially arranged with a heating zone, a buffer zone and a cooling zone along the moving direction of the conveying device;

[0006] Wherein, the heating zone includes a first heating plate and a second heating plate arranged opposite to each other, the buffer zone includes a first buffer plate and a second buffer plate arranged opposite to each other, the cooling zone includes a first cooling plate and a second cooling plate arranged opposite to each other, and the conveying device operates in the space between the first heating plate and the second heating plate, the space between the first buffer plate and the second buffer plate, and the space between the first cooling plate and the second cooling plate.

[0007] In some embodiments of the present disclosure, the conveying device includes a traction member and a conveyor belt, the conveyor belt is used to place the bottom guard plate, and the traction member is used to provide power to pull the conveyor belt to run;

[0008] The second heating plate and the first heating plate are symmetrically distributed relative to the conveyor belt, the second buffer plate and the first buffer plate are symmetrically distributed relative to the conveyor belt, and the second cooling plate and the first cooling plate are symmetrically distributed relative to the conveyor belt.

[0009] In some embodiments of the present disclosure, the bottom guard plate includes a first surface layer, a protective layer, a metal layer, and a second surface layer stacked in sequence, the first surface layer is opposite to the first heating plate, the first buffer plate, and the first cooling plate, and the second surface layer is opposite to the second heating plate, the second buffer plate, and the second cooling plate;

[0010] Wherein, the temperature of the first heating plate is lower than the temperature of the second heating plate;

[0011] The temperature of the first buffer plate is higher than the temperature of the second buffer plate;

[0012] The temperature of the first cooling plate is higher than the temperature of the second cooling plate.

[0013] In some embodiments of the present disclosure, a first heating medium channel is disposed in the first heating plate, a second heating medium channel is disposed in the second heating plate, and an arrangement density of the first heating medium channel is greater than an arrangement density of the second heating medium channel.

[0014] In some embodiments of the present disclosure, a first buffer medium channel is disposed in the first buffer plate, a second buffer medium channel is disposed in the second buffer plate, and an arrangement density of the first buffer medium channel is smaller than an arrangement density of the second buffer medium channel.

[0015] In some embodiments of the present disclosure, a first cooling medium channel is disposed in the first cooling plate, a second cooling medium channel is disposed in the second cooling plate, and an arrangement density of the first cooling medium channel is smaller than an arrangement density of the second cooling medium channel.

[0016] In some embodiments of the present disclosure, the bottom guard plate segmented cooling device also includes a control unit, and the heating zone, the buffer zone and the cooling zone are respectively connected to the control unit.

[0017] In some embodiments of the present disclosure, the temperature of the first heating plate is controlled between 220-230°C, the temperature of the first buffer plate is controlled between 75-85°C, and the temperature of the first cooling plate is controlled between 15-20°C;

[0018] The temperature of the second heating plate is controlled between 240-250°C, the temperature of the second buffer plate is controlled between 65-75°C, and the temperature of the second cooling plate is controlled between 10-15°C.

[0019] In some embodiments of the present disclosure, the distance between the heating zone and the buffer zone is 2-5 cm, and the distance between the buffer zone and the cooling zone is 2-5 cm.

[0020] In some embodiments of the present disclosure, the conveyor belt comprises a Teflon strip.

[0021] The bottom guard plate segmented cooling device provided by the utility model has at least the following advantages:

[0022] The utility model provides a segmented cooling device for the bottom guard plate. By adding a buffer zone between the heating zone and the cooling zone, the buffer zone can gradually reduce the temperature of the bottom guard plate. The heat inside the bottom guard plate can be dissipated more evenly, effectively balancing the temperature change of the bottom guard plate during the heating and cooling process, preventing the plate deformation, warping or cracking caused by the stress concentration of the bottom guard plate due to too fast temperature change, and helping to maintain the shape stability of the bottom guard plate and ensure the consistency of product quality. At the same time, by arranging heating plates, buffer plates and cooling plates on both sides of the bottom guard plate, both sides of the bottom guard plate can be heated and cooled at the same time, and the temperature distribution of the bottom guard plate during the processing process is more uniform, reducing the deformation problem caused by temperature difference, thereby improving the processing quality and consistency of the bottom guard plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic cross-sectional structure diagram of a bottom guard plate segmented cooling device provided for an exemplary embodiment of the utility model;

[0025] Figure 2 A schematic diagram of the cross-sectional structure of a bottom guard plate provided as an exemplary embodiment of the utility model.

[0026] The following are marked in the accompanying drawings:

[0027] 1. Heating zone; 11. First heating plate; 12. Second heating plate; 2. Buffer zone; 21. First buffer plate; 22. Second buffer plate; 3. Cooling zone; 31. First cooling plate; 32. Second cooling plate; 4. Conveyor belt; 5. Bottom guard plate; 51. First surface layer; 52. Buffer layer; 53. Metal layer; 54. Second surface layer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the utility model.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The power battery pack of new energy vehicles is generally placed on a tray on the vehicle chassis. In order to prevent the battery from being damaged by external forces, a bottom guard plate needs to be added to the bottom of the tray.

[0031] In the prior art, the bottom guard plate press used in the process of manufacturing the bottom guard plate is divided into only two zones, the heating zone (oil heating pipeline) and the cooling zone (hydrocondensate cooling pipeline), and only one temperature can be set in the cooling zone. Therefore, if the plate is to be cooled quickly, the temperature difference between the set temperature of the cooling zone and the temperature of the heating zone is too large, which will cause the plate to generate greater internal stress during the cooling process, causing the plate to deform, warp or crack, affecting the brittleness, toughness and flatness of the plate, thereby reducing the quality and performance of the product.

[0032] Combine the following Figure 1-Figure 2 The embodiments of the present utility model are further described.

[0033] In order to solve the above technical problems, the utility model provides a bottom guard plate segmented cooling device. By adding a buffer zone between the heating zone and the cooling zone, the buffer zone can gradually reduce the temperature, and the heat inside the bottom guard plate can be dissipated more evenly, effectively balancing the temperature change of the bottom guard plate during the heating and cooling process, preventing the plate deformation, warping or cracking caused by the stress concentration of the bottom guard plate due to too fast temperature change, helping to maintain the shape stability of the bottom guard plate and ensure the consistency of product quality. At the same time, by arranging heating plates, buffer plates and cooling plates on both sides of the bottom guard plate, both sides of the bottom guard plate can be heated and cooled at the same time, and the temperature distribution of the bottom guard plate during the processing process is more uniform, reducing the deformation problem caused by temperature difference, thereby improving the processing quality and consistency of the bottom guard plate.

[0034] An exemplary embodiment of the present disclosure provides a bottom guard plate segmented cooling device, referring to Figure 1 , including a frame, on which a conveying device and a heating and cooling zone 3 are arranged, the conveying device is used to transport the bottom guard plate material 5 to the heating and cooling zone 3, and the heating and cooling zone 3 is sequentially arranged with a heating zone 1, a buffer zone 2 and a cooling zone 3 along the moving direction of the conveying device. Among them, the heating zone 1, the buffer zone 2 and the cooling zone 3 can be carried out by electric heating and electric cooling, or by arranging different media inside to achieve the effect of heating or cooling, wherein the temperature of each zone can be set according to different temperature requirements. By adding the buffer zone 2 between the heating zone 1 and the cooling zone 3, the buffer zone 2 can play a role in gradually reducing the temperature, and the heat inside the bottom guard plate material 5 can be dissipated more evenly, effectively balancing the temperature change of the bottom guard plate material 5 during the heating and cooling process, preventing the deformation, warping or cracking of the plate caused by the stress concentration of the bottom guard plate material 5 due to too fast temperature change, reducing the performance difference of the plate caused by excessive temperature change, helping to maintain the shape stability of the bottom guard plate, and ensuring the consistency of product quality.

[0035] The heating zone 1 includes a first heating plate 11 and a second heating plate 12 arranged oppositely, the buffer zone 2 includes a first buffer plate 21 and a second buffer plate 22 arranged oppositely, the cooling zone 3 includes a first cooling plate 31 and a second cooling plate 32 arranged oppositely, and the conveying device operates in the space between the first heating plate 11 and the second heating plate 12, the space between the first buffer plate 21 and the second buffer plate 22, and the space between the first cooling plate 31 and the second cooling plate 32. It should be noted that the upper and lower partition temperatures of the heating zone 1, the buffer zone 2, and the cooling zone 3 can be controlled according to the different layer structures and heat conduction speeds of the bottom guard plate 5. That is to say, the temperatures of the first heating plate 11 and the second heating plate 12 can be the same or different, the temperatures of the first buffer plate 21 and the second buffer plate 22 can be the same or different, and the temperatures of the first cooling plate 31 and the second cooling plate 32 can be the same or different. By arranging heating plates, buffer plates and cooling plates on both sides of the bottom guard plate material 5, when the conveying device runs in the space between them, the two side surfaces of the bottom guard plate material 5 can be heated and cooled at the same time, and the temperature distribution of the bottom guard plate material 5 during the processing is more uniform, reducing the deformation problem caused by temperature difference, thereby improving the processing quality and consistency of the bottom guard plate.

[0036] In some embodiments of the present invention, referring to Figure 1The conveying device includes a traction member and a conveyor belt 4, the conveyor belt 4 is used to place the bottom guard plate 5, the traction member is used to provide power for traction of the conveyor belt 4, the second heating plate 12 and the first heating plate 11 are symmetrically distributed with respect to the conveyor belt 4, the second buffer plate 22 and the first buffer plate 21 are symmetrically distributed with respect to the conveyor belt 4, and the second cooling plate 32 and the first cooling plate 31 are symmetrically distributed with respect to the conveyor belt 4. For example, referring to Figure 1 , the second heating plate 12 is arranged above the first heating plate 11, the second buffer plate 22 is arranged above the first buffer plate 21, the second cooling plate 32 is arranged above the first cooling plate 31, and the conveyor belt 4 runs in the space between the first heating plate 11 and the second heating plate 12, the space between the first buffer plate 21 and the second buffer plate 22, and the space between the first cooling plate 31 and the second cooling plate 32. The traction member provides a stable and continuous power for the conveyor belt 4, and the symmetrically distributed heating plates, buffer plates and cooling plates also ensure that the plate stays in each processing area for a consistent time. At the same time, the two sides of the bottom guard plate 5 can be heated and cooled simultaneously up and down, ensuring the uniformity of heating and cooling of the bottom guard plate 5, avoiding quality problems caused by uneven temperature distribution, and thus improving the overall production efficiency.

[0037] In some embodiments of the present invention, referring to Figure 1 and Figure 2 The bottom guard plate material 5 includes a first surface layer 51, a buffer layer 52, a metal layer 53 and a second surface layer 54 which are stacked in sequence. The first surface layer 51 is opposite to the first heating plate 11, the first buffer plate 21 and the first cooling plate 31, and the second surface layer 54 is opposite to the second heating plate 12, the second buffer plate 22 and the second cooling plate 32. The temperature of the first heating plate 11 is lower than that of the second heating plate 12, the temperature of the first buffer plate 21 is higher than that of the second buffer plate 22, and the temperature of the first cooling plate 31 is higher than that of the second cooling plate 32. The buffer layer 52 includes but is not limited to a honeycomb layer. That is to say, in other embodiments, the buffer layer 52 may also be other structures. For example, the buffer layer 52 may also be a multi-layer stacked CFRT layer (glass fiber polyethylene composite material). The buffer layer 52 is not specifically limited here. Since the structures of the layers of the bottom guard plate material 5 are different, the heat conduction rates of the layers are different. The temperatures of the first heating plate 11, the first buffer plate 21, the first cooling plate 31 and the second heating plate 12, the second buffer plate 22, the second cooling plate 32 are set to be different, thereby avoiding thermal stress or deformation of the bottom guard plate material 5 caused by the temperature difference on both sides and improving the flatness of the plate.

[0038] In some embodiments of the present invention, referring to Figure 1, a first heating medium channel is provided in the first heating plate 11, and a second heating medium channel is provided in the second heating plate 12, and the arrangement density of the first heating medium channel is greater than the arrangement density of the second heating medium channel. Exemplarily, a plurality of interconnected first heating medium channels are provided in the first heating plate 11, and a plurality of interconnected second heating medium channels are provided in the second heating plate 12. The temperature can be increased by oil heat in the first heating medium channel and the second heating medium channel. Since the density of most liquids (including oil) decreases with increasing temperature, the arrangement density of the oil in the first heating medium channel is greater than the arrangement density of the oil in the second heating medium channel, so as to achieve the effect that the temperature of the first heating plate 11 is lower than the temperature of the second heating plate 12. By controlling the arrangement density in the first heating medium channel and the second heating medium channel, the temperature of the first heating plate 11 and the second heating plate 12 can be controlled, thereby achieving precise control of the heating speed and temperature distribution of different surface layers, avoiding inconsistent heat conduction on both sides of the plate, and affecting the brittleness, toughness and flatness of the plate.

[0039] In some embodiments of the present invention, referring to Figure 1 , a first buffer medium channel is provided in the first buffer plate 21, and a second buffer medium channel is provided in the second buffer plate 22, and the arrangement density of the first buffer medium channel is less than the arrangement density of the second buffer medium channel. Exemplarily, a plurality of first buffer medium channels interconnected are provided in the first buffer plate 21, and a plurality of second buffer medium channels interconnected are provided in the second buffer plate 22, and the temperature in the first buffer medium channel and the second buffer medium channel can be controlled by water cooling. Since the temperature of the second heating plate 12 above the bottom guard plate 5 is higher than the temperature of the first heating plate 11 below the bottom guard plate 5 when the bottom guard plate 5 passes through the heating zone 1, in order to ensure the cold zone effect of the bottom guard plate 5, the arrangement density of the buffer medium in the first buffer medium channel is less than the arrangement density of the buffer medium in the second buffer medium channel, so as to achieve the effect that the buffer temperature of the first buffer plate 21 is higher than the buffer temperature of the second buffer plate 22. By controlling the arrangement density in the first buffer medium channel and the second buffer medium channel, the temperature of the first buffer plate 21 and the second buffer plate 22 is controlled, thereby realizing the precise control of the cooling buffer speed and temperature distribution of different surface layers.

[0040] In some embodiments of the present invention, referring to Figure 1, a first cooling medium channel is arranged in the first cooling plate 31, and a second cooling medium channel is arranged in the second cooling plate 32, and the arrangement density of the first cooling medium channel is less than the arrangement density of the second cooling medium channel. Exemplarily, a plurality of first cooling medium channels interconnected are arranged in the first cooling plate 31, and a plurality of second cooling medium channels interconnected are arranged in the second cooling plate 32, and the temperature can be controlled by arranging cooling water in the first cooling medium channel and the second cooling medium channel. By making the arrangement density of the cooling medium in the second cooling medium channel greater than the arrangement density of the cooling medium in the first cooling medium channel, the effect of the temperature of the second cooling plate 32 being lower than the temperature of the first cooling plate 31 is achieved. By controlling the arrangement density in the first cooling medium channel and the second cooling medium channel, the temperature of the first cooling plate 31 and the second cooling plate 32 are controlled, thereby realizing precise control of the cooling speed and temperature distribution of different surface layers, and achieving a cooling effect.

[0041] In some embodiments of the present invention, referring to Figure 1 The bottom guard plate segmented cooling equipment also includes a control unit, and the heating zone 1, buffer zone 2 and cooling zone 3 are respectively connected to the control unit. The traction member is also connected to the control unit, and the rotation speed of the traction member is controlled by the control unit, so as to realize the control of the running speed of the conveyor belt 4, and ensure that the bottom guard plate material 5 is fully heated and cooled in the heating zone 1, buffer zone 2 and cooling zone 3. At the same time, by connecting with the control unit, the temperature of the heating zone 1, buffer zone 2 and cooling zone 3 can be accurately controlled. The control unit can adjust the temperature of each area according to a preset program or real-time feedback data to ensure that the bottom guard plate material 5 is properly processed at each stage, thereby optimizing the quality and performance of the product. The operating temperature of the heating zone 1, buffer zone 2 and cooling zone 3 can be flexibly adjusted through the control unit, so that the bottom guard plate segmented cooling equipment can adapt to the production needs of bottom guard plate materials 5 of different specifications and materials, thereby improving the flexibility and versatility of the equipment.

[0042] In some embodiments of the present invention, referring to Figure 1, the temperature of the first heating plate 11 is controlled between 220-230°C, the temperature of the first buffer plate 21 is controlled between 75-85°C, and the temperature of the first cooling plate 31 is controlled between 15-20°C; the temperature of the second heating plate 12 is controlled between 240-250°C, the temperature of the second buffer plate 22 is controlled between 65-75°C, and the temperature of the second cooling plate 32 is controlled between 10-15°C. Exemplarily, the temperature of the first heating plate 11 is controlled at 230°C, the temperature of the first buffer plate 21 is controlled at 80°C, and the temperature of the first cooling plate 31 is controlled at 20°C; the temperature of the second heating plate 12 is controlled at 250°C, the temperature of the second buffer plate 22 is controlled at 70°C, and the temperature of the second cooling plate 32 is controlled at 15°C. The bottom guard plate material 5 is preformed by the heating zone 1, and then cooled and formed by the cooling zone 3. A buffer zone 2 is set between the heating zone 1 and the cooling zone 3, and then the buffer zone 2 is used to prevent the temperature difference between the cooling zone 3 and the heating zone 1 from being too large, which may cause deformation, warping or cracking of the plate.

[0043] In some embodiments of the present invention, referring to Figure 1 , the distance between the heating zone 1 and the buffer zone 2 is 2-5cm, and the distance between the buffer zone 2 and the cooling zone 3 is 2-5cm. Exemplarily, the distance between the heating zone 1 and the buffer zone 2 is 3cm, and the distance between the buffer zone 2 and the cooling zone 3 is 3cm. Among them, the widths of the heating zone 1, the buffer zone 2 and the cooling zone 3 are equal to or equal to the width of the bottom guard plate material 5. The spacing distance between the heating zone 1, the buffer zone 2 and the cooling zone 3 can be adjusted according to specific production requirements, equipment size and characteristics of the bottom guard plate material 5 to ensure efficient operation of the production line. At the same time, the spacing distance provides the bottom guard plate material 5 with space to gradually adapt to temperature changes, avoiding thermal stress or deformation caused by sudden temperature changes, and ensuring the quality of the plate.

[0044] In some embodiments of the present invention, referring to Figure 1 The conveyor belt 4 includes a Teflon strip. The Teflon strip can work stably in a range of extremely low temperature (-196°C) to extremely high temperature (300°C), and can drive the bottom guard plate 5 to work normally in the heating zone 1, the cold zone buffer zone 2 and the cooling zone 3, ensuring that the plate is heated evenly, avoiding overheating or insufficient heating, and thus improving the quality of the bottom guard plate.

[0045] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present utility model.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so 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 also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A bottom guard plate segmented cooling device, characterized in that: The machine comprises a frame, on which a conveying device and a heating and cooling zone are arranged, wherein the conveying device is used to convey the bottom guard plate to the heating and cooling zone, and the heating and cooling zone is sequentially arranged with a heating zone, a buffer zone and a cooling zone along the moving direction of the conveying device; Wherein, the heating zone includes a first heating plate and a second heating plate arranged opposite to each other, the buffer zone includes a first buffer plate and a second buffer plate arranged opposite to each other, the cooling zone includes a first cooling plate and a second cooling plate arranged opposite to each other, and the conveying device operates in the space between the first heating plate and the second heating plate, the space between the first buffer plate and the second buffer plate, and the space between the first cooling plate and the second cooling plate.

2. The bottom guard plate segmented cooling device according to claim 1, characterized in that: The conveying device comprises a traction member and a conveyor belt, wherein the conveyor belt is used to place the bottom guard plate, and the traction member is used to provide power to pull the conveyor belt to run; The second heating plate and the first heating plate are symmetrically distributed relative to the conveyor belt, the second buffer plate and the first buffer plate are symmetrically distributed relative to the conveyor belt, and the second cooling plate and the first cooling plate are symmetrically distributed relative to the conveyor belt.

3. The bottom guard plate segmented cooling device according to claim 1, characterized in that: The bottom guard plate comprises a first surface layer, a buffer layer, a metal layer and a second surface layer which are stacked in sequence, the first surface layer is opposite to the first heating plate, the first buffer plate and the first cooling plate, and the second surface layer is opposite to the second heating plate, the second buffer plate and the second cooling plate; Wherein, the temperature of the first heating plate is lower than the temperature of the second heating plate; The temperature of the first buffer plate is higher than the temperature of the second buffer plate; The temperature of the first cooling plate is higher than the temperature of the second cooling plate.

4. The bottom guard plate segmented cooling device according to claim 3 is characterized in that: The first heating plate is provided with a first heating medium channel, the second heating plate is provided with a second heating medium channel, and the arrangement density of the first heating medium channel is greater than the arrangement density of the second heating medium channel.

5. The bottom guard plate segmented cooling device according to claim 3, characterized in that: A first buffer medium channel is disposed in the first buffer plate, and a second buffer medium channel is disposed in the second buffer plate. The arrangement density of the first buffer medium channel is smaller than the arrangement density of the second buffer medium channel.

6. The bottom guard plate segmented cooling device according to claim 3, characterized in that: A first cooling medium channel is disposed in the first cooling plate, and a second cooling medium channel is disposed in the second cooling plate. The arrangement density of the first cooling medium channel is smaller than the arrangement density of the second cooling medium channel.

7. The bottom guard plate segmented cooling device according to claim 3, characterized in that: The bottom guard plate segmented cooling device also includes a control unit, and the heating zone, the buffer zone and the cooling zone are respectively connected to the control unit.

8. The bottom guard plate segmented cooling device according to claim 3, characterized in that: The temperature of the first heating plate is controlled between 220-230°C, the temperature of the first buffer plate is controlled between 75-85°C, and the temperature of the first cooling plate is controlled between 15-20°C; the temperature of the second heating plate is controlled between 240-250°C, the temperature of the second buffer plate is controlled between 65-75°C, and the temperature of the second cooling plate is controlled between 10-15°C.

9. The bottom guard plate segmented cooling device according to claim 1, characterized in that: The distance between the heating zone and the buffer zone is 2-5 cm, and the distance between the buffer zone and the cooling zone is 2-5 cm.

10. The bottom guard plate segmented cooling device according to claim 2, characterized in that: The conveyor belt comprises a Teflon strip.

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