A heat preservation conveying channel structure for reducing temperature drop of a material sheet and a temperature maintaining method thereof

Abstract

The application discloses a heat preservation conveying channel structure for reducing temperature drop of a material sheet and a temperature maintaining method thereof, relates to high-temperature conveying technology in a metal material sheet heat treatment or hot forming production line, and comprises a pair of mounting racks, a gas floating plate arranged between the mounting racks, a protective shell wrapped outside a conveying line composed of the mounting racks and the gas floating plate, connecting pipelines arranged on both sides of the protective shell and serving as supporting members of the gas floating plate and external gas source access members, and a collecting cover arranged on the top of the protective shell and used for recycling gas in the protective shell. The protective shell is composed of a reflection layer, a phase change layer, a heat insulation lining and a hollow interlayer in sequence, a multistage synergistic heat preservation barrier of radiation reflection, phase change heat storage, gas blocking and basic heat insulation is formed, the path of heat conduction and radiation loss to the outside through the shell is effectively blocked, and the temperature drop rate in the long-distance conveying process is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for metal sheets, and in particular to a heat-insulating conveying channel structure and a method for maintaining the temperature of the sheet to reduce temperature drop. Background Technology

[0002] In industrial production lines for heat treatment, hot rolling, hot pressing, or thermoforming of metal sheets, the sheets are usually transported at high temperatures to enter the next processing step, thus requiring heat preservation.

[0003] Currently, common methods for heat-insulated conveying of sheet materials mainly include: using a closed conveying channel with an insulation layer, and using hot air circulation or electric heating devices to supplement the temperature inside the channel; or setting an insulation cover above the conveying rollers to reduce heat loss to the outside; some solutions also use air flotation conveying technology, which forms an air film by spraying compressed air or high-temperature gas onto the bottom of the sheet material to achieve contactless support conveying.

[0004] Traditional insulation layers are mostly made of a single insulating material, with limited insulation effect. In high-temperature environments, heat can still be quickly dissipated through conduction or radiation from the shell, making it difficult to meet the temperature drop requirements for long-distance transportation. Secondly, the gas used in air flotation conveying is mostly room temperature or unheated compressed air. Directly spraying it onto the lower surface of the material will actually exacerbate the temperature drop and fail to provide effective insulation. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a heat-insulating conveying channel structure and its temperature-maintaining method for reducing the temperature drop of the material sheet, so as to solve the technical problems of poor heat insulation effect of existing conveying channels, the aggravation of material sheet temperature drop by air flotation gas, uneven heating of the upper and lower surfaces, and surface quality degradation caused by high-temperature oxidation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heat-insulating conveying channel structure for reducing the temperature drop of sheet materials, comprising: a pair of mounting frames, with an air flotation plate disposed between the pair of mounting frames; a protective shell, covering the outside of the conveying line composed of the mounting frames and the air flotation plate; connecting pipes disposed on both sides of the outside of the protective shell, serving as supports for the air flotation plate and external air source access components; a collection hood disposed on the top of the protective shell, used to recover the gas inside the protective shell; a gas storage tank and a heating box are respectively disposed inside the processing box, a blower is disposed on one side of the processing box corresponding to the heating box, a conveying coil is disposed in the middle section of the processing box, and the gas storage tank, the conveying coil and the heating box are separated by a partition.

[0007] The invention is further configured to include: a connecting cover, connected among multiple collection covers to form a complete gas recovery pipeline; a guide fan and a collection pipe, wherein the collection cover is sequentially connected to a heating box, a guide fan, and a collection pipe, for extracting gas from the protective shell; a support frame, disposed at the bottom of both ends of the mounting frame, for supporting the overall device; a processing box, disposed on one side of the protective shell, with a filter collection chamber on its upper part, the filter collection chamber being connected to the collection pipe, and its bottom being connected to the air flotation plate through a recovery pipe; an air compressor, disposed below the protective shell; a flow control solenoid valve, disposed at the bottom of the protective shell, one end of which is connected to the air compressor, and the other end of which is connected to the input end of the conveying coil, the output end of the conveying coil extending to the outside of the processing box and connected to the connecting pipeline through a connecting pipe; the protective shell, from the inside out, sequentially includes a reflective layer, a phase change layer, a heat insulation lining, a hollow interlayer, and a metal shell. The air flotation plate is connected to an external air source through the connecting pipeline, and the air is sprayed out by the air flotation plate to form an air film, used for air flotation support and heat preservation of the material sheet.

[0008] The present invention is further configured such that the filter collection chamber is connected to the collection pipe for filtering the recovered hot gas, and the filtered gas enters the air flotation plate through the recovery pipe.

[0009] The invention is further configured such that the blower supplies air into the processing box, which is then heated by the heating box and output; the conveying coil is coiled inside the processing box to exchange heat with the heated gas.

[0010] The present invention is further configured such that the air compressor compresses the gas and provides compressed gas to the delivery coil through the flow control solenoid valve, and the compressed gas is sent into the air flotation plate through the connecting pipe and the connecting pipeline.

[0011] The present invention is further configured such that the reflective layer is used to reflect and insulate the gas inside the protective shell, the hollow interlayer is filled with gas to form a gas-insulating high-temperature layer, the heat-insulating lining is used to maintain the temperature, and the metal shell serves as the outer protective structure.

[0012] The present invention is further configured such that the gas heated by the heating box enters the interior of the protective shell through the recovery pipe.

[0013] The present invention is further configured such that the gas ejected from the air flotation plate acts directly on the material sheet to support and keep it warm.

[0014] A temperature holding method includes the following steps: The hot air inside the protective shell is recovered through the collection hood and the guiding fan, and then sent to the filter collection chamber for filtration through the collection pipe. The filtered hot air is sent to the air flotation plate through the recovery pipe to provide air flotation support and heat preservation for the material sheet. The air compressor provides compressed gas, which enters the conveying coil through the flow control solenoid valve. After heat exchange with the heated gas generated by the heating box in the processing box, it is sent to the air flotation plate through the connecting pipe and connecting pipeline, and the gas is sprayed out to keep the material sheet warm. At the same time, the interior of the protective shell is insulated in multiple stages through the reflective layer, phase change layer, heat insulation lining and hollow interlayer.

[0015] The invention is further configured such that gas is introduced into the hollow interlayer to form a gas-isolated high-temperature layer, which works in synergy with the phase change layer, the heat insulation lining and the reflective layer to reduce the temperature drop of the material sheet during the conveying process.

[0016] In summary, the present invention has the following main beneficial effects: This invention utilizes a protective outer shell composed of a reflective layer, a phase change layer, a heat-insulating lining, and a hollow interlayer to form a multi-level synergistic thermal insulation barrier that integrates radiation reflection, phase change heat storage, gas isolation, and basic insulation. This effectively blocks the path of heat loss through conduction and radiation from the shell, significantly reducing the temperature drop rate during long-distance transport. Simultaneously, a heating chamber within the processing box independently heats the gas, and a conveying coil housed within the processing box exchanges heat with the high-temperature gas. This ensures that the gas, compressed by an air compressor and regulated by a flow-control solenoid valve, is fully preheated before being fed into the air flotation plate. This avoids the problem of sudden cooling of the material caused by direct injection of room-temperature compressed gas, thus providing both support and active heating for the air flotation gas. Function; Based on this, a closed-loop hot gas recovery system constructed through a collection hood, guiding fan, filter collection chamber, and recovery pipe filters, stabilizes, and reheats the escaping hot gas, ensuring a high degree of consistency and stability in the temperature of the circulating airflow. Combined with the heating gas evenly sprayed onto the lower surface of the material by the air flotation plate, the phenomenon of uneven heating of the upper and lower surfaces of the material is effectively eliminated. Furthermore, inert gas in the air storage tank is used as the air flotation and protective medium, which acts on the surface of the material plate after heating. While achieving contactless and stable conveying, it can effectively isolate the oxidizing atmosphere in the workshop environment and provide further anti-oxidation protection for the surface of the material plate, thereby improving the temperature maintenance effect of the material plate and the surface quality of the product during the conveying process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the back of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a bottom view of the overall structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the processing box of the present invention; Figure 6 This is a schematic diagram of the protective shell structure of the present invention.

[0018] Reference numerals: 1. Mounting bracket; 2. Air flotation plate; 3. Protective shell; 4. Blower; 5. Filter collection chamber; 6. Collection pipe; 7. Guide fan; 8. Collection cover; 9. Connecting cover; 10. Connecting pipe; 11. Support frame; 12. Air compressor; 13. Recovery pipe; 14. Processing box; 15. Connecting pipe; 16. Flow control solenoid valve; 17. Conveying coil; 18. Air storage tank; 19. Heating box; 20. Metal shell; 21. Thermal insulation lining; 22. Hollow interlayer; 23. Phase change layer; 24. Reflective layer. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0020] This invention provides a heat-insulating conveying channel structure to reduce the temperature drop of the material sheets, as described in the reference. Figures 1-3 The conveyor system is laid out in a long, strip-like pattern, suitable for high-temperature metal sheets. The main structure consists of a pair of mounting frames 1, which are parallel to each other and spaced at predetermined intervals. Between the pair of mounting frames 1 are multiple air-floating plates 2, arranged sequentially or extending integrally along the conveying direction. Their upper surfaces are densely covered with numerous micropores or air jets to eject gas upwards, forming an air film that supports the sheet material. Correspondingly, a protective outer shell 3 is provided outside the pair of mounting frames 1. This protective shell 3 completely encloses the entire conveyor line consisting of the mounting frames 1 and the air-floating plates 2 along the conveying direction, thus forming a relatively enclosed, insulated space within which the sheet material is suspended and conveyed.

[0021] In conjunction with the above structure, a pair of connecting pipes 10 are provided on both sides of the outer shell 3, corresponding to the positions of the air flotation plate 2. The connecting pipe 10 serves as both a physical support for the air flotation plate 2, fixedly connected to the mounting frame 1 to support the air flotation plate 2, and an access point for an external air source. Its inner cavity is connected to the internal air passage of the air flotation plate 2, and is used to introduce externally heated compressed gas into the air flotation plate 2, which is then ejected from the surface of the air flotation plate 2.

[0022] On the top of the protective housing 3, multiple collection hoods 8 are spaced apart along the conveying direction. The opening of each collection hood 8 faces downwards and directly into the internal cavity of the protective housing 3, and is used to draw in and recover hot gas inside the protective housing 3. Connecting hoods 9 are connected between adjacent collection hoods 8, and multiple collection hoods 8 are connected in series through connecting hoods 9, thereby forming a complete gas recovery pipeline on the top of the protective housing 3.

[0023] In the aforementioned recovery pipeline, the top outlet of the collection hood 8 is connected to the heating box 19, the top outlet of the heating box 19 is connected to the guide fan 7, and the air outlet of the guide fan 7 is connected to the collection pipe 6. After the guide fan 7 is started, the hot air inside the protective shell 3 is drawn in from the collection hood 8, passes through the heating box 19 (which can selectively supplement heating), and is then output outward from the collection pipe 6, thereby realizing the active recovery of the hot air inside the protective shell 3, preventing the disorderly overflow of high-temperature gas, and reducing internal air pressure fluctuations.

[0024] Support frames 11 are fixedly installed at the bottom of both ends of a pair of mounting frames 1. The support frames 11 are column structures made of welded or bolted steel, with their tops fixedly connected to the mounting frames 1 and their bottoms fixed to the workshop foundation or conveyor platform base. The support frames 11 also provide auxiliary support for the connecting pipes 10 to ensure the levelness and structural stability of the air flotation plate 2 and the entire conveying channel, thereby providing reliable support for the overall device.

[0025] Based on the above structure, a processing box 14 is provided on one side (e.g., the left or right side) of the protective shell 3. The processing box 14 is a hollow box structure, made of thermal insulation material or lined with a thermal insulation layer. A filter collection chamber 5 is provided above the processing box 14, and the air inlet of the filter collection chamber 5 is connected to the outlet of the collection pipe 6. The hot air drawn out by the guide fan 7 enters the filter collection chamber 5 through the collection pipe 6. The filter collection chamber 5 is equipped with multiple layers of filter screens or filter elements (e.g., metal wire mesh, ceramic fiber filter layer, or activated carbon filter layer) for dust removal and impurity removal filtration of the recovered hot air to remove particulate matter such as oxide scale and dust that may be introduced during the material conveying process.

[0026] The bottom outlet of the filter collection chamber 5 is connected to the internal air passage of the air flotation plate 2 through the recovery pipe 13. The purified hot air is directly sent into the air flotation plate 2 through the recovery pipe 13, so that when the air flotation plate 2 sprays out, it acts on the bottom of the material again to realize the recycling of hot air and heat preservation and replenishment.

[0027] Inside the processing chamber 14, a gas storage tank 18 and a heating chamber 19 are respectively located on the left and right sides. Specifically, the gas storage tank 18 is located on one side of the processing chamber 14, and the heating chamber 19 is located on the other side. The gas storage tank 18 is filled with an inert gas, such as nitrogen, argon, or helium, as a flotation and protective medium. The heating chamber 19 is equipped with multiple sets of electric heating tubes or gas heaters for heating the flowing air.

[0028] In conjunction with the above structure, a blower 4 is installed on one side of the exterior of the processing box 14, corresponding to the position of the heating box 19. The air outlet of the blower 4 is connected to the interior of the processing box 14, and its inlet is connected to the workshop air or inert gas source. The blower 4 draws air or inert gas into the processing box 14. After passing through the heating box 19, the gas is heated to a predetermined temperature, depending on the process requirements of the sheet material, and is discharged from the output end of the heating box 19.

[0029] refer to Figure 5 A conveying coil 17 is installed in the middle section of the processing chamber 14. The conveying coil 17 is a spirally wound or serpentine metal tube, with both ends extending to the outside of the processing chamber 14. The gas storage tank 18, the conveying coil 17, and the heating chamber 19 are isolated from each other by vertical partitions fixed inside the processing chamber 14, so that the three are located in independent compartments, avoiding direct gas cross-flow and ensuring orderly heat exchange.

[0030] refer to Figure 4 An air compressor 12 is located at the bottom of the entire protective housing 3. The air inlet of the air compressor 12 is connected to the air outlet of the air tank 18, and is used to compress and pressurize the inert gas output from the air tank 18. A flow control solenoid valve 16 is located at the bottom of the protective housing 3. This flow control solenoid valve 16 is an electrically controlled flow regulating valve. One end of its input is connected to the air outlet of the air compressor 12 through a pressure-resistant pipe, and the other end of its output is connected to the end of the conveying coil 17 located inside the processing box 14. The other end of the conveying coil 17 extends to the outside of the processing box 14 and is connected to the connecting pipe 10 on the outside of the protective housing 3 through a connecting pipe 15.

[0031] After the air compressor 12 starts, it compresses the inert gas in the air tank 18 to a predetermined pressure. The compressed gas, after its flow rate is precisely regulated by the flow control solenoid valve 16, enters the conveying coil 17. Since the conveying coil 17 is coiled inside the processing box 14, and the processing box 14 simultaneously receives high-temperature gas supplied by the blower 4 and heated by the heating box 19, the compressed inert gas in the conveying coil 17 undergoes sufficient heat exchange with the external high-temperature heated gas as it flows in the coil, thus being preheated to a temperature close to the process requirements. The preheated compressed gas is then sent into the air flotation plate 2 through the connecting pipe 15 and the connecting pipe 10, and finally evenly sprayed out from the jet holes on the surface of the air flotation plate 2, forming a high-temperature gas film on the lower surface of the material sheet. This gas film provides non-contact air flotation support to the material sheet, ensuring stable conveying of the material sheet, and also directly insulates and heats the bottom of the material sheet through the heated gas, effectively slowing down the temperature drop of the material sheet during the conveying process. At the same time, the use of inert gas can create a local inert atmosphere on the lower surface of the material, isolating oxygen in the workshop air and reducing high-temperature oxidation.

[0032] Based on the above structure, refer to Figure 6 The gas heated by the heating box 19 inside the treatment box 14 enters the interior of the protective shell 3 through the recovery pipe 13 to replenish the internal heat loss. The overall structure of the protective shell 3 is a multi-layer composite insulation structure. Specifically, the protective shell 3 is provided with a reflective layer 24, a phase change layer 23, a heat insulation lining 21, a hollow interlayer 22, and a metal shell 20 from the inside out.

[0033] The reflective layer 24 is the innermost layer of the protective outer shell 3, directly facing the internal high-temperature cavity. The reflective layer 24 uses a high-reflectivity material such as an aluminum foil multilayer or a ceramic reflective coating. Its function is to reflect the infrared thermal radiation radiated by the internal materials and high-temperature gases back into the cavity, reducing the outward transfer of radiated heat. The inner surface of the reflective layer 24 may also have micro-protrusions or a corrugated structure to increase the reflective area and scattering effect.

[0034] The phase change layer 23 is disposed on the outside of the reflective layer 24 and is filled with a phase change heat storage material, such as a paraffin-based phase change material. When the internal temperature of the protective shell 3 is higher than the phase change temperature of the phase change material, the phase change material absorbs excess heat and undergoes a phase change, storing the heat in the form of latent heat. When the internal temperature drops, the phase change material releases the stored heat, thereby playing a role in temperature buffering and peak shaving, effectively delaying the temperature drop of the material sheet.

[0035] The heat insulation lining 21 is set on the outside of the phase change layer 23. It is made of heat insulation material with low thermal conductivity and its thickness can be set to 50mm-200mm according to the heat insulation requirements. It is used as the main basic heat insulation layer to prevent heat from being lost to the outside through conduction.

[0036] A hollow interlayer 22 is disposed on the outside of the heat-insulating lining 21, and is formed by inner and outer wall panels to create a closed or semi-closed air gap. The hollow interlayer 22 is connected to an external air source or the internal cavity of the protective shell 3 through pipelines, and gas is introduced into it, which can be recovered hot gas or separately supplied inert gas, forming a high-temperature layer isolated by gas. Utilizing the low thermal conductivity of the gas itself, this interlayer further cuts off the path of heat conduction to the outside, and if hot gas is introduced, it can also actively heat the shell.

[0037] The metal outer shell 20 is the outermost layer of the protective outer shell 3. It is made of carbon steel or stainless steel sheet and has a thickness of 2mm-6mm. Its function is to provide mechanical protection and structural support for the entire multi-layer composite structure, while preventing external moisture and dust from entering the inner insulation layer.

[0038] Through the multi-level synergistic effect of the reflective layer 24 reflecting internal heat back into the cavity, the phase change layer 23 storing and buffering heat, the heat insulation lining 21 providing basic heat insulation, the hollow interlayer 22 providing gas isolation and heat preservation, and the metal shell 20 providing protection, the protective shell 3 can efficiently insulate the internal transport environment and significantly reduce heat loss to the external environment.

[0039] The present invention also provides a temperature holding method using the above-described structure, specifically including the following steps: The first step is to start the guide fan 7 and blower 4. The guide fan 7 extracts the hot air from inside the protective housing 3 through the collection cover 8 and connecting cover 9, and sends it into the filter collection chamber 5 through the collection pipe 6. Inside the filter collection chamber 5, the hot air passes sequentially through the coarse filter, medium filter, and high efficiency filter element to remove oxide scale debris, dust particles, and other impurities. The filtered clean hot air is then sent from the bottom of the filter collection chamber 5 into the internal air passage of the air flotation plate 2 through the recovery pipe 13.

[0040] In the second step, the air flotation plate 2 sprays filtered clean hot air from its surface micropores, forming a high-temperature air flotation film at the bottom of the material sheet. This air film provides upward air flotation support to the material sheet, allowing it to slide smoothly along the conveying direction without contact, avoiding friction damage with mechanical parts. On the other hand, because the hot air itself has a high temperature, it directly contacts the lower surface of the material sheet, which can actively heat and insulate the material sheet, slowing down the temperature drop.

[0041] In the third step, the air compressor 12 starts, drawing inert gas from the air tank 18 and compressing it. The compressed inert gas, after being adjusted to the required flow rate by the flow control solenoid valve 16, enters the conveying coil 17 inside the processing box 14. Simultaneously, the blower 4 supplies air or replenishes inert gas into the processing box 14. This gas is heated to the set temperature by the heating box 19. The high-temperature heated gas flows outside the conveying coil 17, efficiently exchanging heat with the compressed inert gas flowing inside the coil, preheating the compressed inert gas to near the target temperature. The preheated compressed inert gas is output from the other end of the conveying coil 17, passing through the connecting pipe 15 and connecting pipeline 10 into the air flotation plate 2, and finally sprayed out from the air flotation plate 2, providing air flotation support and high-temperature insulation for the material sheet. Because inert gas from the air tank 18 is used, the sprayed gas forms a localized inert protective atmosphere on the lower surface of the material sheet, effectively isolating it from the oxidizing atmosphere in the workshop environment, preventing high-temperature oxidation of the material sheet surface, and providing further protection for the material sheet surface.

[0042] Fourthly, throughout the entire conveying process, the protective outer shell 3 provides multi-level insulation through its multi-layered composite structure. Specifically, the reflective layer 24 reflects the heat rays radiated by the material and high-temperature gas back into the conveying cavity, reducing radiative heat loss; the phase change layer 23 absorbs or releases latent heat during temperature fluctuations, maintaining internal temperature stability; the heat-insulating lining 21 uses low thermal conductivity materials to block heat conduction and loss; and gas is introduced into the hollow interlayer 22 to form a gas-insulated high-temperature layer, further cutting off the heat conduction path. The synergistic effect of these four layers, combined with the external protection of the metal outer shell 20, ensures that the internal temperature field of the protective outer shell 3 remains uniform and stable.

[0043] More preferably, the hollow interlayer 22 can be connected to the recovery pipe 13, introducing a portion of filtered high-temperature hot gas into the interior of the hollow interlayer 22 to form an active high-temperature gas barrier layer. This allows the internal temperature of the interlayer to approach the temperature of the conveying cavity, thereby minimizing the temperature difference between the inside and outside, reducing the driving force of heat conduction, and significantly improving the overall insulation effect. Through the above method, the heat storage buffer of the phase change layer 23, the basic heat insulation of the heat insulation lining 21, the gas barrier of the hollow interlayer 22, and the heat radiation reflection of the reflective layer 24 together form a multi-level insulation system, effectively reducing the temperature drop of the material sheet during long-distance conveying and ensuring that the material sheet still has a temperature that meets the process requirements when entering the next process. The above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit it. Anyone skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A heat-insulating conveying channel structure for reducing the temperature drop of sheet materials, characterized in that, include: A pair of mounting brackets (1), with an air flotation plate (2) disposed between the pair of mounting brackets (1); The protective outer shell (3) is wrapped around the outside of the conveyor line consisting of the mounting frame (1) and the air flotation plate (2); Connecting pipes (10) are installed on both sides of the outer side of the protective shell (3) to serve as support for the air flotation plate (2) and an external air source access device; A collection hood (8) is provided on top of the protective shell (3) for collecting the gas inside the protective shell (3); The processing box (14) is located on one side of the protective shell (3), and a filter collection chamber (5) is provided above it. The top of the filter collection chamber (5) is connected to a collection pipe (6), and its bottom is connected to the air flotation plate (2) through a recovery pipe (13). The processing box (14) is equipped with a gas storage tank (18) and a heating box (19). A blower (4) is provided on one side of the processing box (14) corresponding to the heating box (19). A conveying coil (17) is provided in the middle section of the processing box (14). The gas storage tank (18), the conveying coil (17) and the heating box (19) are separated by a partition.

2. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 1, characterized in that, Also includes: A connecting cover (9) is connected between multiple collection covers (8) to form a complete gas recovery pipeline; The guide fan (7) and the collection pipe (6) are connected in sequence to the heating box (19), the guide fan (7) and the collection pipe (6) to extract the gas inside the protective shell (3); Support frame (11) is provided at the bottom of both ends of the mounting frame (1) to support the overall device; An air compressor (12) is located below the protective housing (3); A flow control solenoid valve (16) is located at the bottom of the protective housing (3). One end of the valve is connected to the air compressor (12), and the other end is connected to the input end of the conveying coil (17). The output end of the conveying coil (17) extends to the outside of the processing box (14) and is connected to the connecting pipe (10) through the connecting pipe (15). The protective outer shell (3) includes, from the inside out, a reflective layer (24), a phase change layer (23), a heat insulation liner (21), a hollow interlayer (22), and a metal shell (20). The air flotation plate (2) is connected to an external air source through the connecting pipe (10), and the air film is formed by the air flotation plate (2) to support and insulate the material sheet.

3. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 1, characterized in that, The filter collection chamber (5) is connected to the collection pipe (6) and is used to filter the recovered hot gas. The filtered gas enters the air flotation plate (2) through the recovery pipe (13).

4. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 1, characterized in that, The blower (4) sends air into the processing box (14), which is heated by the heating box (19) and then output. The conveying coil (17) is coiled inside the processing box (14) to exchange heat with the heated gas.

5. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 2, characterized in that, The air compressor (12) compresses the gas and provides compressed gas to the delivery coil (17) through the flow control solenoid valve (16). The compressed gas is sent into the air flotation plate (2) through the connecting pipe (15) and the connecting pipe (10).

6. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 2, characterized in that, The reflective layer (24) is used to reflect and insulate the gas inside the protective shell (3). Gas is introduced into the hollow interlayer (22) to form a gas-isolated high-temperature layer. The heat-insulating liner (21) is used to maintain the temperature. The metal shell (20) serves as the outer protective structure.

7. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 1, characterized in that, The gas heated by the heating box (19) enters the interior of the protective shell (3) through the recovery pipe (13).

8. The heat-insulating conveying channel structure for reducing material temperature drop according to claim 1, characterized in that, The gas ejected from the air flotation plate (2) acts directly on the material sheet to support and keep it warm.

9. A temperature holding method employing the structure described in any one of claims 1 to 8, characterized in that, Includes the following steps: The hot air inside the protective shell (3) is recovered through the collection cover (8) and the guide fan (7) and sent into the filter collection chamber (5) for filtration through the collection pipe (6); The filtered hot air is sent into the air flotation plate (2) through the recovery pipe (13) to provide air flotation support and heat preservation for the material sheet; The air compressor (12) provides compressed gas, which enters the conveying coil (17) through the flow control solenoid valve (16). After exchanging heat with the heating gas generated by the heating box (19) in the processing box (14), the gas is sent to the air flotation plate (2) through the connecting pipe (15) and the connecting pipe (10), and the gas is sprayed out to keep the material sheet warm. Meanwhile, the interior of the protective shell (3) is insulated in multiple stages through the reflective layer (24), phase change layer (23), heat insulation liner (21) and hollow interlayer (22).

10. The temperature holding method according to claim 9, characterized in that, Gas is introduced into the hollow interlayer (22) to form a gas-isolated high-temperature layer, which works in conjunction with the phase change layer (23), the heat insulation liner (21) and the reflective layer (24) to reduce the temperature drop of the material during the conveying process.

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