Hot air double-circulation heat treatment furnace

Abstract

The utility model discloses a hot air double-circulation heat treatment furnace which comprises a furnace body, and the furnace body is sequentially provided with an isolation area, a drying area and a cooling area in the product conveying direction. The drying area comprises at least one drying mechanism which is sequentially arranged, each drying mechanism comprises a box body, a heating assembly, a circulating air duct and a suction assembly, and a drying channel for products to pass through is formed in each box body; the heating assembly comprises heating cavities symmetrically formed in the two sides of the box body, and a heating piece capable of independently running is arranged in each heating cavity; the circulating air ducts are in one-to-one correspondence with the heating cavities and are used for communicating the corresponding heating cavities and the drying channels; the suction assemblies are arranged in one-to-one correspondence with the heating cavities and are arranged at the tops of the corresponding heating cavities; the suction assembly is used for sucking the corresponding heating cavity so that airflow in the heating cavity can circulate in the circulating air channel and the drying channel. According to the utility model, double-path cyclic heating can be carried out on products entering the drying channel, so that the drying efficiency is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cell production, in particular to a heat treatment furnace with double hot air circulation. Background Art

[0002] In the field of solar silicon wafer manufacturing, drying of solar cells is one of the most important steps, and the cassette drying furnace is one of the important devices to complete the drying step. However, most of the existing cassette drying furnaces adopt the heating method of single hot air circulation. This circulation method requires a relatively high power for the motor, and sufficient negative pressure needs to be generated during the circulation to ensure the normal progress of the circulation. However, in actual production, due to the long single circulation path, situations such as low circulation efficiency, poor temperature control accuracy, and long drying time often occur due to insufficient negative pressure. Summary of the Utility Model

[0003] To overcome the above disadvantages, the purpose of the utility model is to provide a heat treatment furnace with double hot air circulation, which can perform double-path circulation heating on products, effectively improving the drying efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a heat treatment furnace with double hot air circulation, including a furnace body, which is sequentially provided with an isolation area, a drying area, and a cooling area along the product transmission direction; the drying area includes at least one drying mechanism arranged in sequence, and the drying mechanism includes a box body, inside which there is a drying channel for products to pass through;

[0005] A heating component, including heating chambers symmetrically arranged on both sides of the box body, and each heating chamber is provided with a heating element that can operate independently;

[0006] Circulation air ducts, which are arranged in one-to-one correspondence with the heating chambers, for conducting the corresponding heating chambers and drying channels;

[0007] A suction component, which is arranged in one-to-one correspondence with the heating chambers and is disposed on the top of the corresponding heating chambers; the suction component is used to suck the corresponding heating chambers, so that the air flow in the heating chambers can circulate in the circulation air ducts and drying channels.

[0008] The beneficial effects of the heat treatment furnace with double hot air circulation of the utility model are as follows:

[0009] 1. In the furnace body, through the sequential arrangement of the isolation area, drying area, and cooling area, products (such as solar cells) can be sequentially subjected to deoxidation treatment, drying treatment, and cooling treatment to improve the conversion efficiency of solar cells; among them, in the drying area, through at least one drying mechanism arranged in sequence, solar cells can be continuously dried to improve the drying efficiency;

[0010] 2. In the drying mechanism, heating chambers are respectively arranged on both sides of the box body, and through the arrangement of circulation air ducts corresponding to the heating chambers one by one, each heating chamber can independently communicate with the drying channel; furthermore, through the arrangement of suction components corresponding to the heating chambers one by one, each heating chamber can conduct air circulation with the drying channel; when the heating elements in the heating chambers operate, the hot air flow in the heating chambers can enter the drying channel along the circulation air ducts under the action of the suction components to dry the products in the drying channel; when the heating elements of the two heating chambers and the two suction components operate simultaneously, a dual-path circulation heating mode for the drying channel can be realized, thereby improving the drying effect on the products.

[0011] 3. Through the arrangement of the two heating chambers and the suction components, compared with the prior art, the air circulation path between a single heating chamber and the drying channel can be shortened, thereby reducing the power requirement for the suction components, ensuring the negative pressure stability within a single air circulation path, and thus ensuring the stability of the heating temperature of the products and improving the product drying effect.

[0012] Furthermore, the circulation air duct includes a first air duct and a second air duct used in cooperation. The first air duct is arranged through the side wall of the box body, and the second air duct is clamped between the inner bottom wall and the outer bottom wall of the box body; when the suction component is started, the first air duct diverts the air flow in the corresponding heating chamber into the drying channel, and the second air duct returns the air flow in the drying channel to the corresponding heating chamber. The air circulation between the heating chamber and the drying channel is realized through the cooperation of the first air duct and the second air duct. Moreover, the first air duct is located on the side wall of the box body and the second air duct is located on the bottom wall of the box body, so that a path for air flow can be formed between the side wall and the bottom wall of the box body during the air circulation process, and thus the hot air flow entering the drying channel through the first air duct can fully contact the products in the drying channel.

[0013] Furthermore, the two second air ducts are separated by a partition, and a return opening communicating with both second air ducts is provided on the inner bottom wall of the box body. The setting of the partition can ensure the independent operation of the two second air ducts and prevent air flow from colluding between the two second air ducts. The setting of the return opening can divert the air flow in the drying channel into the second air duct.

[0014] Furthermore, a second perforated plate fixedly connected to the inner bottom wall of the box body is covered at the return opening, and the partition is arranged vertically, with its upper end connected to the middle of the second perforated plate. The setting of the second perforated plate enables the air flow passing through the return opening to be evenly divided by the second perforated plate, and connecting the partition to the middle of the second perforated plate enables part of the air flow divided by the second perforated plate to enter one second air duct and part to enter the other second air duct.

[0015] Furthermore, a first mesh plate is arranged on the inner side wall of the box body, and the air flow entering the box body through the first air duct can be shunted through the first mesh plate and then enter the drying channel. The first mesh plate can shunt the hot air flow entering the drying channel through the first air duct to ensure the uniform flow of the hot air flow and the uniformity of the air flow temperature in the drying channel.

[0016] Furthermore, heat insulation cotton layers are coated on the inner walls of the first air duct and the second air duct to reduce the heat loss during the air flow.

[0017] Furthermore, a waste discharge port communicating with the drying channel is opened at the top of the box body, and a one-way valve is arranged at the waste discharge port. The waste discharge port can discharge the waste gas generated during the drying process, and the one-way valve limits the opening and closing direction of the waste discharge port.

[0018] Furthermore, side baffles are arranged at the intersections of the drying area, the cooling area, and the isolation area in pairs. The side baffles in the drying area are arranged on the inner side wall of the box body and gradually incline from near the inner side wall of the box body to away from the inner side wall of the box body along the product conveying direction. The side baffles can define the intersections of different areas (isolation area, drying area, cooling area), and the inclined setting of the side baffles can guide the air flow in the corresponding area to a certain extent to avoid the air flow from flowing between different areas.

[0019] Furthermore, a product transmission mechanism is jointly arranged among the isolation area, the drying area, and the cooling area, and a buffer transmission mechanism for temporarily storing the flower baskets is arranged below the furnace body; a lifting mechanism for transmitting the flower baskets to the product transmission mechanism is arranged between the product transmission mechanism and the buffer transmission mechanism. Through the product transmission mechanism, the product can be transferred among the isolation area, the drying area, and the cooling area. When the product is transported by the flower basket, after the product is processed in the heat treatment furnace, the product can be transferred from the outlet of the heat treatment furnace to the next process, and the empty flower basket can be temporarily stored or re-transferred to the lower part of the inlet of the heat treatment furnace through the buffer transmission mechanism. The lifting mechanism can lift the empty flower basket in the buffer transmission mechanism back to the product transmission mechanism to load the product to be processed.

[0020] Furthermore, the cooling area includes a cooling channel communicating with the drying channel. Cooling fans and exhaust ports communicating with the cooling channel are respectively arranged on both sides of the cooling channel along the direction perpendicular to the product conveying direction; and third mesh plates are arranged on both sides of the cooling channel along the direction perpendicular to the product conveying direction. Through the cooling area, the dried product can be cooled. Description of the Drawings

[0021] Figure 1 This is a schematic structural diagram of a heat treatment furnace with a double hot air circulation according to an embodiment of the present utility model;

[0022] Figure 2 This is a schematic structural diagram of a drying mechanism according to an embodiment of the present utility model;

[0023] Figure 3 This is a sectional view of a drying mechanism according to an embodiment of the present utility model;

[0024] Figure 4 This is a sectional view of a cover plate covering a box body according to an embodiment of the present utility model;

[0025] Figure 5 This is a top view of a heat treatment furnace equipped with a product transmission mechanism according to an embodiment of the present utility model;

[0026] Figure 6 This is a side view of a heat treatment furnace equipped with a product transmission mechanism according to an embodiment of the present utility model;

[0027] Figure 7 This is a schematic structural diagram of a buffer transmission mechanism located below a heat treatment furnace according to an embodiment of the present utility model;

[0028] Figure 8 This is a schematic structural diagram of a buffer transmission mechanism according to an embodiment of the present utility model.

[0029] In the figure:

[0030] 1 - furnace body; 11 - isolation area; 12 - drying area; 13 - cooler; 131 - cooling channel; 132 - cooling fan; 133 - air exhaust port; 134 - third mesh plate;

[0031] 2 - drying mechanism; 21 - box body; 211 - drying channel; 22 - heating component; 221 - heating cavity; 222 - heating element; 23 - suction component; 241 - first air duct; 242 - second air duct; 25 - first mesh plate; 26 - second mesh plate; 27 - partition; 28 - guiding inclined plate; 29 - cover plate; 291 - waste discharge port;

[0032] 3 - side baffle;

[0033] 4 - product transmission mechanism;

[0034] 5 - buffer transmission mechanism; 51 - buffer rack; 52 - linear transmission module. Detailed implementation manners

[0035] The following elaborates on the preferred embodiments of the present utility model in conjunction with the accompanying drawings, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, thereby making the protection scope of the present utility model more clearly defined.

[0036] Embodiment

[0037] In the prior art, most of the cassette drying furnaces are provided with heating components on one side of the drying channel. The hot air heated by the heating components enters from one side of the drying channel and returns to the heating components through the return channel on the other side of the drying channel to complete a primary air flow cycle. In this cycle mode, it is necessary to ensure that sufficient negative pressure can be generated in the return channel on the other side of the drying channel to ensure the smooth return of the air flow to the heating components. However, in actual production, due to the limited power of the circulation fan, there is often a phenomenon that the heat circulation progress is slow due to insufficient negative pressure in the return channel.

[0038] Based on this, see the attached Figures 1 - 3 As shown in the figure, a heat treatment furnace with a double hot air circulation of the present utility model includes a furnace body 1. Along the product transmission direction, an isolation area 11, a drying area 12, and a cooling area 13 are sequentially arranged on the furnace body 1. The drying area 12 includes at least one drying mechanism 2 arranged in sequence. Each drying mechanism 2 includes a box body 21, a heating component 22, a circulation air duct, and a suction component 23. Among them, a drying channel 211 for the product to pass through is arranged in the box body 21. The heating component 22 includes heating chambers 221 symmetrically arranged on both sides of the box body 21, and an independently operable heating element 222 is arranged in each heating chamber 221. The circulation air ducts are arranged in one-to-one correspondence with the heating chambers 221 for conducting the corresponding heating chambers 221 and the drying channel 211. The suction components 23 are arranged in one-to-one correspondence with the heating chambers 221 and are arranged on the top of the corresponding heating chambers 221. The suction components 23 are used to suck the corresponding heating chambers 221 so that the air flow in the heating chambers 221 can circulate in the circulation air ducts and the drying channel 211.

[0039] During the transmission of the product (such as a solar cell) in the furnace body 1, it can be subjected to deoxidation treatment, drying treatment, and cooling treatment in sequence through the isolation area 11, the drying area 12, and the cooling area 13 to improve the conversion efficiency of the solar cell. Among them, in the drying area 12, the solar cell can be continuously dried through at least one drying mechanism 2 arranged in sequence to improve the drying efficiency of the solar cell. In the drying mechanism 2, by respectively arranging heating chambers 221 on both sides of the box body 21 and through the arrangement of the circulation air ducts in one-to-one correspondence with the heating chambers 221, each heating chamber 221 can be independently communicated with the drying channel 211. Then, through the arrangement of the suction components 23 in one-to-one correspondence with the heating chambers 221, each heating chamber 221 can conduct air flow circulation with the drying channel 211. When the heating element in the heating chamber 221 operates, the hot air flow in the heating chamber 221 can enter the drying channel 211 along the circulation air duct under the action of the suction component 23 to perform a drying operation on the product in the drying channel 211.

[0040] In this embodiment, see the attachedFigures 3 - 4 As shown, heating chambers 221 are provided on both sides of the box body 21. When the two heating chambers 221 operate simultaneously, the heat flows in the two heating chambers 221 can enter the drying channel 211 from both sides of the box body 21 to increase the temperature in the drying channel 211. Through the arrangement of the two heating chambers 221 and the suction assembly 23, the air flow circulation path between a single heating chamber 221 and the drying channel 211 can be shortened. It is equivalent to that each heating chamber 221 only needs to circulate and heat half of the space in the drying channel 211. Therefore, the power requirement for the suction assembly 23 can be reduced, the negative pressure stability in a single air flow circulation path can be ensured, and then the stability of the heating temperature of the product can be ensured, improving the drying effect of the product.

[0041] In some embodiments, refer to the attached Figure 3 As shown, the circulation air duct includes a first air duct 241 and a second air duct 242 used in cooperation. The first air duct 241 is disposed through the side wall of the box body 21, and the second air duct 242 is clamped between the inner bottom wall and the outer bottom wall of the box body 21. When the suction assembly 23 is started, the first air duct 241 diverts the air flow in the corresponding heating chamber 221 into the drying channel 211, and the second air duct 242 returns the air flow in the drying channel 211 to the corresponding heating chamber 221.

[0042] When the heating element 222 in the heating chamber 221 operates, the temperature in the heating chamber 221 rises accordingly. At this time, the corresponding suction assembly 23 is started, and the hot air flow in the heating chamber 221 can enter the drying channel 211 along the first air duct 241 to dry the product in the drying channel 211. Subsequently, in the drying channel 211, the air flow after exchanging heat with the product then returns to the heating chamber 221 through the second air duct 242 at its bottom for reheating, thus forming a circulating flow of air between the heating chamber 221 and the drying channel 211. Through the circulating flow of air, the temperature stability in the drying channel 211 can be ensured, and then the uniformity of the product being heated can be ensured, improving the drying effect of the product. And the first air duct 241 is located on the side wall of the box body 21, and the second air duct 242 is located on the bottom wall of the box body 21. During the circulating flow of air, a path for air flow can be formed between the side wall and the bottom wall of the box body 21, so that the hot air flow entering the drying channel 211 through the first air duct 241 can fully contact the product in the drying channel 211.

[0043] In some embodiments, refer to the attached Figure 2As shown, first mesh plates 25 covering the first air duct 241 are evenly arranged on both inner side walls of the box body 21, and the first mesh plates 25 are arranged vertically. The air flow entering the box body 21 through the first air duct 241 can be split by the first mesh plates 25 and then enter the drying channel 211, so as to ensure that the hot air flow in the first air duct 241 is evenly dispersed into the drying channel 211, and to a certain extent, reduce the temperature difference in the drying channel 211. Exemplarily, a plurality of mesh holes distributed in a matrix are formed in the first mesh plates 25. When the hot air flow flows to the first mesh plates 25, the non-mesh parts of the first mesh plates 25 can be gradually heated up during the contact with the hot air flow; while the mesh parts can allow the hot air flow to pass through and evenly distribute the hot air flow into the drying channel 211.

[0044] In some embodiments, refer to the appendix Figure 3 As shown, a return opening communicating with both second air ducts 242 is formed in the inner bottom wall of the box body 21, and a second mesh plate 26 fixedly connected to the inner bottom wall of the box body 21 is covered at the return opening. The air flow in the drying channel 211 can enter the second air ducts 242 through the return opening, and the second mesh plate 26 can evenly split the air flow.

[0045] Furthermore, in order to ensure the independence of the two second air ducts 242, the second air ducts 242 are arranged horizontally, and a partition plate 27 is provided between the two second air ducts 242. The partition plate 27 is arranged vertically, with its upper end connected to the middle of the second mesh plate 26 and its lower end connected to the box body 21. The arrangement of the partition plate 27 ensures the independent operation of the two second air ducts 242 and avoids the air flow from flowing between the two second air ducts 242. And because the partition plate 27 is connected to the middle of the second mesh plate 26, when the air flow in the drying channel 211 is split by the second mesh plate 26, the air flow split to one side of the partition plate 27 can enter one of the second air ducts 242 located on the same side of the partition plate 27 as it, and the air flow split to the other side of the partition plate 27 can enter the other second air duct 242 located on the same side of the partition plate 27 as it.

[0046] Since the air flow in the drying channel 211 enters the second air duct 242 downward, and the second air duct 242 is arranged horizontally (that is, the air flow flows horizontally in the second air duct 242), therefore, when the air flow enters the second air duct 242 from the drying channel 211, the flow direction changes greatly. In some embodiments, a guiding inclined plate 28 can be arranged in the second air duct 242, and one end of the guiding inclined plate 28 is fixed on the inner bottom wall of the box body 21, and the other end is fixed on the partition plate 27. And a channel for the air flow to flow into the second air duct 242 is provided on the guiding inclined plate 28. Exemplarily, the guiding inclined plate 28 can be a perforated plate. Such a setting enables the air flow in the drying channel 211 to be guided by the guiding inclined plate 28 first, so as to change the downward flow direction into an inclined flow direction, and then enter the second air duct 242 to become a horizontal flow direction. It is equivalent to buffering the air flow direction change through the guiding inclined plate 28.

[0047] In some embodiments, in order to reduce the heat loss of the air flow during the circulating flow, heat insulation cotton layers are coated on the inner walls of the first air duct 241 and the second air duct 242.

[0048] In some embodiments, see the attached Figure 4 As shown in the figure, a cover plate 29 is provided on the top of the box body 21. One end of the cover plate 29 is rotatably connected to the box body 21, and the other end is detachably connected to the box body 21, so as to facilitate opening or closing the cover plate 29 and facilitate the maintenance of the box body 21. Further, during the drying process, waste gas will be generated in the drying channel 211. In order to discharge the waste gas, a waste discharge port 291 communicating with the drying channel 211 is opened on the cover plate 29, and a one-way valve is installed at the waste discharge port 291. The one-way valve can only open in the direction away from the drying channel 211, so as to prevent external gas from entering the drying channel 211 from the waste discharge port.

[0049] In some embodiments, see the attached Figures 3 - 4 As shown in the figure, the heating element 222 includes a plurality of electric heating tubes distributed from bottom to top in the heating cavity 221. The electric heating tubes are arranged horizontally, and one end of each electric heating tube is fixedly connected to the side wall of the heating cavity 221. By arranging a plurality of electric heating tubes, the temperature in the heating cavity 221 can be quickly increased to enhance the heating effect.

[0050] In some embodiments, the suction assembly 23 includes a suction fan installed on the top of the heating cavity 221. The working principle and structure of the suction fan are prior art and will not be elaborated in this embodiment.

[0051] In some embodiments, side baffles 3 are provided at the intersections of the drying area 12, the cooling area 13, and the isolation area 11. Taking the drying area 12 as an example, as Figure 2As shown in the figure, the side baffles 3 in the drying area 12 are arranged on the two inner sidewalls of the box body 21 and gradually incline from near the inner sidewall of the box body 21 to away from the inner sidewall of the box body 21 along the product conveying direction. The setting of the side baffles 3 can define the junctions of different areas (the isolation area 11, the drying area 12, and the cooling area 13), and the inclined setting of the side baffles 3 can guide the airflow in the corresponding area to a certain extent to avoid the airflow from flowing between different areas.

[0052] In some embodiments, refer to the appendix Figure 1 、 5 As shown in FIGS. 5 and 6, the cooling area 13 includes a cooling channel 131 communicating with the drying channel 211. Cooling fans 132 and air outlets 133 communicating therewith are respectively arranged on both sides of the cooling channel 131 along the direction perpendicular to the product conveying direction. And third mesh plates 134 are arranged on both sides of the cooling channel 131 along the direction perpendicular to the product conveying direction.

[0053] The cooling fan 132 sucks external cold air into the cooling channel 131, thereby cooling the products in the cooling channel 131. Then the gas in the cooling channel 131 can be discharged from the air outlet 133 to ensure that the external cold air can continuously enter the cooling channel 131 from the cooling fan 132. Through the cooperation of the cooling fan 132 and the air outlet 133, the products entering the cooling channel 131 can be cooled by air. And through the setting of the third mesh plates 134, the airflow can flow evenly in the cooling channel 131. It should be noted that the second mesh plates 26 and the third mesh plates 134 have the same structure as the first mesh plate 25, and the only difference is the size.

[0054] In order to realize the transmission of products in the furnace body 1, in some embodiments, refer to the appendix Figures 5 - 7 As shown in the figure, a product transmission mechanism 4 is commonly provided among the isolation area 11, the drying area 12, and the cooling area 13. The product transmission mechanism 4 can adopt a sprocket transmission mechanism in the prior art. Further, a carrier for carrying products, such as a flower basket, is arranged on the product transmission mechanism 4. Through the setting of the flower basket, multiple products can be loaded at the same time, improving the work efficiency.

[0055] In actual application, after being processed by the heat treatment furnace, the products will flow from the outlet of the heat treatment furnace (the side close to the cooling area) to the next process, while the empty flower baskets stay on the product transmission mechanism 4. In order to recycle or temporarily store the empty flower baskets, in some embodiments, a buffer transmission mechanism 5 can be arranged below the furnace body 1. Specifically, refer to the appendix Figures 7 - 8 As shown in the figure, the buffer transmission mechanism 5 includes a buffer rack 51. The buffer rack 51 is arranged horizontally, and its two ends respectively extend to the lower parts of the inlet and outlet of the heat treatment furnace. And a linear transmission module 52 is arranged on the buffer rack 51.

[0056] In use, when the product flows from the outlet of the heat treatment furnace to the next process, the empty flower basket remains at the outlet of the heat treatment furnace. At this time, the empty flower basket is placed on the linear transmission module 52 of the buffer rack 51, and the temporary storage operation of the empty flower basket can be carried out; and when the empty flower basket is needed at the inlet of the heat treatment furnace, the empty flower basket can be reflowed to one side of the inlet of the heat treatment furnace through the linear transmission module 52.

[0057] Since there is a height difference between the buffer transmission mechanism 5 and the furnace body 1, in some embodiments, a lifting mechanism (not shown in the figure) can be provided between the product transmission mechanism 4 and the buffer transmission mechanism 5 near the inlet of the heat treatment furnace to lift the flower basket on the buffer transmission mechanism 5 onto the product transmission mechanism 4 to load the product to be processed in the heat treatment furnace.

[0058] The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It should not be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A hot air double circulation heat treatment furnace, comprising a furnace body, wherein the furnace body is provided with an isolation zone, a drying zone, and a cooling zone in sequence along the product transmission direction; characterized in that: The drying area includes at least one drying mechanism arranged in sequence, and the drying mechanism includes A box body, which is provided with a drying passage for the product to pass through; A heating assembly, comprising heating chambers symmetrically arranged on both sides of the box body, each of the heating chambers being provided with a heating element capable of operating independently; A circulating air duct is arranged one by one with the heating chambers to connect the corresponding heating chambers and drying passages; A suction component is arranged in one-to-one correspondence with the heating chamber and is arranged on the top of the corresponding heating chamber; the suction component is used to suck the corresponding heating chamber so that the airflow in the heating chamber can circulate in the circulating air duct and the drying channel.

2. The hot air double circulation heat treatment furnace according to claim 1, characterized in that: The circulating air duct includes a first air duct and a second air duct used in conjunction with each other, the first air duct is arranged through the side wall of the box body, and the second air duct is sandwiched between the inner bottom wall and the outer bottom wall of the box body; when the suction component is started, the first air duct guides the airflow in the corresponding heating cavity to the drying channel, and the second air duct returns the airflow in the drying channel to the corresponding heating cavity.

3. The hot air double circulation heat treatment furnace according to claim 2, characterized in that: The two second air ducts are separated by a partition plate, and a return opening communicating with the two second air ducts is provided on the inner bottom wall of the box body.

4. The hot air double circulation heat treatment furnace according to claim 3, characterized in that: The reflux opening is covered with a second mesh plate fixed to the bottom wall of the box body, and the partition is arranged vertically, with its upper end connected to the middle of the second mesh plate.

5. The hot air double circulation heat treatment furnace according to claim 2, characterized in that: A first mesh plate is arranged on the inner side wall of the box body, and the airflow entering the box body through the first air duct can enter the drying channel after being diverted by the first mesh plate.

6. The hot air double circulation heat treatment furnace according to claim 2, characterized in that: The inner walls of the first air duct and the second air duct are both covered with a thermal insulation cotton layer.

7. The hot air double circulation heat treatment furnace according to claim 1, characterized in that: A waste outlet communicated with the drying channel is provided on the top of the box body, and a one-way valve is provided at the waste outlet.

8. The hot air double circulation heat treatment furnace according to claim 1, characterized in that: The drying zone, cooling zone and isolation zone are each provided with a side baffle at their junctions, and the side baffle of the drying zone is arranged on the inner wall of the box body and gradually tilts from close to the inner wall of the box body to away from the inner wall of the box body along the conveying direction of the product.

9. The hot air double circulation heat treatment furnace according to claim 1, characterized in that: A product conveying mechanism is provided between the isolation zone, the drying zone and the cooling zone; a buffer conveying mechanism for temporarily storing flower baskets is provided under the furnace body; a lifting mechanism for conveying the flower baskets to the product conveying mechanism is provided between the product conveying mechanism and the buffer conveying mechanism.

10. The hot air double circulation heat treatment furnace according to claim 1, characterized in that: The cooling zone includes a cooling channel connected to the drying channel, and the cooling channel is respectively provided with a cooling fan and an exhaust port connected thereto on both sides perpendicular to the product conveying direction; and the cooling channel is provided with a third mesh plate on both sides perpendicular to the product conveying direction.

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