A heat cycle paper box drying device

Abstract

The utility model relates to paper box drying technical field, concretely is a kind of paper box drying device convenient to heat cycle. Including drying assembly, hot blast assembly, circulating assembly, object carrier assembly, the drying assembly includes drying machine box, the hot blast assembly includes air heater, the circulating assembly includes circulating fan, the object carrier assembly includes object carrier, bearing plate, the drying machine box top is sealed with centrifugal fan by flange plate connection, the shunt pipe lower end is threadedly connected with drying spray head, the outer wall of drying machine box is fixedly connected with filter box by angle code support. Through the opening of circulating groove, the channel for the flow of gas in the drying machine box, and then facilitate the circulation of hot air and the flow of moisture-containing gas, the airflow carrying water vapor enters the filter box from the air inlet pipe, the circulating fan delivers the purified airflow to the heating layer above through the circulating pipe, mixes with the heat generated by the heating pipe and then enters the cycle again, forming a closed loop.

Description

Technical Field

[0001] This utility model relates to the field of cardboard drying technology, specifically to a cardboard drying device that facilitates heat circulation. Background Technology

[0002] Moisture absorption is a common problem in the production, storage, and logistics of cardboard boxes. Moisturized boxes are prone to weakening, deformation, and even mold growth, seriously affecting product quality and distribution safety. Therefore, cardboard box drying equipment has become a crucial piece of equipment in the packaging industry to ensure the performance of cardboard boxes.

[0003] Existing carton drying equipment has the following technical defects in practical applications: low heat utilization efficiency. Traditional equipment mostly adopts a direct exhaust hot air design. The heat generated by the hot air blower is directly discharged with the hot and humid air after a single use, resulting in a high heat loss rate. This not only leads to excessive energy consumption but also causes abnormal increases in the ambient temperature of the workshop. Utility Model Content

[0004] To address the above problems, the purpose of this utility model is to provide a convenient heat circulation cardboard drying device, solving the problem that the heat generated by the hot air blower is directly discharged with the humid air after a single use, resulting in high heat loss, excessive energy consumption, and abnormally high ambient temperature in the workshop. By opening a circulation trough, a channel is provided for the flow of gas inside the drying chamber, which facilitates the circulation of hot air and the flow of humid gas. At the same time, some of the hot air forms a horizontal airflow through the circulation trough, which crosses with the vertical airflow to reduce the temperature gradient inside the drying chamber. The circulating fan transports the purified airflow through the circulation pipe to the top of the heating layer, where it mixes with the heat generated by the heating pipe and re-enters the circulation, forming a closed loop.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a convenient heat circulation cardboard box drying device, comprising a drying component, a hot air component, a circulation component, and a carrying component. The drying component includes a drying chamber, the hot air component includes a hot air blower, the circulation component includes a circulating fan, and the carrying component includes a carrying rack and a support plate. A heating layer is fixedly connected to the bottom inner side of the drying chamber by countersunk bolts. The two side walls of the drying chamber are symmetrically provided with dehumidification side openings. A centrifugal fan is sealed to the top of the drying chamber by flanges, and a heat-resistant silicone sealing ring is sandwiched between the flanges. The output end of the hot air blower is connected to a first air supply pipe by a quick-release clamp. A diversion pipe is welded at equal intervals on one side of the first air supply pipe. A drying nozzle is threaded to the lower end of the diversion pipe. A filter box is fixedly connected to the outer wall of the drying chamber by an angle bracket. The two ends of the carrying rack are symmetrically welded with retaining strips. A guide groove is integrally formed on the lower surface of the carrying rack. A guide rail is milled at equal intervals on one end of the support plate.

[0006] The beneficial effects of this utility model are as follows: the opening of the circulation groove provides a channel for the flow of gas inside the drying chamber, thereby facilitating the circulation of hot air and the flow of humid gas. At the same time, some of the hot air forms a horizontal airflow through the circulation groove, which crosses with the vertical airflow, reducing the temperature gradient inside the drying chamber. After the hot air flows through the cardboard box, the airflow carrying water vapor enters the filter box through the air inlet pipe. The circulating fan transports the purified airflow through the circulation pipe to the top of the heating layer, where it mixes with the heat generated by the heating pipe and re-enters the circulation, forming a closed loop.

[0007] To prevent burns from hot air escaping when pulling the door handle:

[0008] As a further improvement to the above technical solution: a temperature and humidity sensor is fixedly connected to the outer wall of the drying chamber by screws. The probe of the temperature and humidity sensor penetrates the wall through a waterproof connector and extends to the middle of the inner side of the drying chamber. The gap between the sensor and the wall is filled with fireproof sealant. The front end of the drying chamber is rotatably connected to the door by a stainless steel hinge. A magnetic strip is provided on the edge of the door that contacts the chamber body. A 3mm thick tempered glass observation window is inlaid in the middle of the door. The edge sealing strip is made of silicone rubber material that can withstand 200℃.

[0009] The beneficial effects of this improvement are as follows: During the drying process, the temperature and humidity sensor transmits data to the LCD display screen of the operation panel in real time with an accuracy of ±1℃ / ±2%RH. After the drying program is completed, press the confirmation button on the panel, and when the display screen shows that the temperature inside the chamber is ≤35℃, pull the door handle to open the chamber, thus avoiding the overflow of high-temperature hot air and burns.

[0010] To ensure fresh air enters the unit after being filtered through the exhaust vent's filter, the centrifugal fan will be turned off when the humidity drops to 45% RH.

[0011] As a further improvement to the above technical solution: the drying chamber has symmetrically opened exhaust side openings on both ends of the wall. A stainless steel filter screen is fixed to the inside of the exhaust side opening by bolts. The edge of the filter screen is wrapped with a nitrile rubber sealing ring. The air inlet of the centrifugal fan is connected to the top of the inside of the drying chamber through a telescopic hose. The space between the heating layer and the inner wall of the drying chamber is filled with high-temperature resistant ceramic fiber cotton. Four sets of U-shaped electric heating tubes are fixed inside the heating layer by ceramic brackets. The heating tubes are covered with quartz sleeves, and the two ends of the sleeves are sealed with silicone plugs.

[0012] The beneficial effects of this improvement are as follows: when the temperature and humidity sensor detects that the humidity inside the chamber is ≥60%RH, the operation panel automatically sends a signal to turn on the centrifugal fan. Fresh air enters the chamber after being filtered through the filter screen of the exhaust side port. When the humidity drops to 45%RH, the centrifugal fan is turned off.

[0013] To ensure that hot air is blown at a 45° angle onto the surface of the cardboard box from the drying nozzle via the air duct and distribution pipe:

[0014] As a further improvement to the above technical solution: the hot air blower is fixed by a mounting base with shock-absorbing pads, the mounting base is connected to the top of the dryer box by expansion bolts, and the hot air blower is connected to the control panel by RVV3×1.5mm. 2 The wiring is connected, and the panel has a rotary temperature control knob and a fan speed switch.

[0015] The beneficial effects of this improvement are as follows: Open the box door, pull the rack to the limit position, place the cartons in layers, close the box door, rotate the temperature knob to the target value, switch to the corresponding wind speed setting, press the start button, the hot air blower runs, and the hot air is blown at a 45° angle to the surface of the carton through the air duct and the split pipe.

[0016] In order for the circulating fan to transport the purified airflow through the circulation pipe to the area above the heating layer, where it mixes with the heat generated by the heating pipe and then re-enters the circulation loop, forming a closed loop:

[0017] As a further improvement to the above technical solution: a rubber shock-absorbing pad is provided between the circulating fan mounting base and the top of the dryer box; the air inlet end of the circulating fan is connected to the second air supply pipe through a threaded joint; the joint is sealed with PTFE tape; and the bottom of the second air supply pipe is connected to the top of the filter box through a flange.

[0018] The beneficial effects of this improvement are as follows: after the hot air flows through the cardboard box, the airflow carrying water vapor enters the filter box through the air inlet pipe. The circulating fan transports the purified airflow through the circulating pipe to the top of the heating layer, where it mixes with the heat generated by the heating pipe and re-enters the circulation, forming a closed loop.

[0019] The filter layer is used to trap paper scraps and impurities:

[0020] As a further improvement to the above technical solution: the outlet of the circulating fan is connected to the circulation pipe through a quick-connect flange, and the flange face is equipped with a heat-resistant asbestos gasket. The circulation pipe is made of φ80mm galvanized steel pipe, which extends vertically downward along the inner wall of the dryer box to a distance of 100mm above the heating layer. The filter box has a filter layer that is slidably connected to the inner wall of the filter box. The filter layer is equipped with a double-layer filter screen with an upper 50-mesh metal mesh and a lower activated carbon felt.

[0021] The beneficial effects of this improvement are: the airflow carrying water vapor enters the filter box from the air inlet pipe, and the filter layer is used to trap paper scraps and impurities.

[0022] To prevent airflow from creating disturbance at the bottom of the carton during the drying process:

[0023] As a further improvement to the above technical solution: the bearing plate is symmetrically fixed to the inner wall of the dryer box by L-shaped corner brackets, the corner brackets are bolted to the box body, the clip is a T-shaped structure, and slides with the guide rail, and the mating surface is coated with high-temperature grease.

[0024] The beneficial effects of this improvement are as follows: When installing the rack, align the clip with the inclined surface at the front end of the guide rail and push it in at a uniform speed until it contacts the limit block. During the drying process, the airflow creates disturbance at the bottom of the carton through the guide groove. When taking out the material, hold the handle at the front end of the rack and pull it out smoothly along the guide rail to 1 / 2 position outside the box door before taking out or putting out the carton.

[0025] To ensure that some hot air flows through the circulation trough to form a transverse airflow that crosses with the longitudinal airflow, thus reducing the temperature gradient inside the dryer chamber:

[0026] As a further improvement to the above technical solution: a rectangular circulation groove is provided on the inner side of the support plate, the circulation groove runs through the width direction of the support plate, and the inner wall of the circulation groove is sprayed with a high-temperature resistant enamel layer.

[0027] The beneficial effects of this improvement are as follows: the opening of the circulation tank provides a channel for the flow of gas inside the dryer chamber, which facilitates the circulation of hot air and the flow of humid gas. At the same time, some of the hot air forms a horizontal airflow through the circulation tank, which crosses with the vertical airflow, reducing the temperature gradient inside the dryer chamber.

[0028] In summary, the beneficial effects of this case are as follows: the opening of the circulation tank provides a channel for the flow of gas inside the drying chamber, thereby facilitating the circulation of hot air and the flow of humid gas. At the same time, some of the hot air forms a horizontal airflow through the circulation tank, which crosses with the vertical airflow, reducing the temperature gradient inside the drying chamber. After the hot air flows through the cardboard box, the airflow carrying moisture enters the filter box through the air inlet pipe. The circulating fan transports the purified airflow through the circulation pipe to the top of the heating layer, where it mixes with the heat generated by the heating pipe and re-enters the circulation, forming a closed loop.

[0029] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0031] Figure 2 This is a cross-sectional structural diagram of the drying chamber of this utility model.

[0032] Figure 3 for Figure 2 A magnified structural diagram of point A in the middle.

[0033] Figure 4 This is a schematic diagram of the structure of the storage rack of this utility model.

[0034] Figure 5 This is a schematic diagram of the structure of the bearing plate of this utility model.

[0035] In the diagram: 1. Drying assembly; 11. Drying chamber; 12. Heating layer; 13. Exhaust side vent; 14. Centrifugal fan; 15. Temperature and humidity sensor; 16. Door; 2. Hot air assembly; 21. Hot air blower; 22. First air duct; 23. Diverter pipe; 24. Drying nozzle; 3. Circulation assembly; 31. Circulation fan; 32. Second air duct; 33. Filter box; 34. Filter layer; 35. Air inlet pipe; 36. Circulation pipe; 4. Loading assembly; 41. Loading rack; 42. Clip; 43. Guide channel; 44. Support plate; 45. Guide rail; 46. Circulation channel. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0037] like Figure 1-5 As shown, a convenient heat circulation cardboard drying device includes a drying assembly 1, a hot air assembly 2, a circulation assembly 3, and a loading assembly 4. The drying assembly 1 includes a drying chamber 11, the hot air assembly 2 includes a hot air blower 21, the circulation assembly 3 includes a circulating fan 31, and the loading assembly 4 includes a loading rack 41 and a support plate 44. A heating layer 12 is fixedly connected to the bottom inner side of the drying chamber 11 by countersunk bolts. The two side walls of the drying chamber 11 are symmetrically provided with dehumidification side openings 13, and the top of the drying chamber 11 is sealed with a flange. The hot air blower 14 has a heat-resistant silicone sealing ring sandwiched between the flanges. The output end of the hot air blower 21 is connected to the first air supply pipe 22 via a quick-release clamp. A diversion pipe 23 is welded at equal intervals on one side of the first air supply pipe 22. A drying nozzle 24 is threaded to the lower end of the diversion pipe 23. A filter box 33 is fixedly connected to the outer wall of the drying chamber 11 via an angle bracket. The two ends of the rack 41 are symmetrically welded with clamping strips 42. A guide groove 43 is integrally formed on the lower surface of the rack 41. A guide rail 45 is milled at equal intervals on one end of the bearing plate 44.

[0038] A temperature and humidity sensor 15 is fixedly connected to the outer wall of the drying chamber 11 by screws. The probe of the temperature and humidity sensor 15 penetrates the wall through a waterproof connector and extends to the middle of the inner side of the drying chamber 11. The gap between the sensor and the wall is filled with fireproof sealant. The front end of the drying chamber 11 is rotatably connected to the door 16 by a stainless steel hinge. The door 16 has a magnetic strip on the edge where it contacts the chamber. A 3mm thick tempered glass observation window is embedded in the middle of the door 16. The edge sealing strip is made of silicone rubber material that can withstand 200℃. During the drying process, the temperature and humidity sensor 15 transmits data to the LCD display of the operation panel in real time with an accuracy of ±1℃ / ±2%RH. After the drying program is completed, press the confirmation button on the panel. When the display shows that the temperature inside the chamber is ≤35℃, pull the handle of the door 16 to open it to avoid the hot air from overflowing and causing burns.

[0039] The drying chamber 11 has symmetrically arranged dehumidification side openings 13 on both ends of its walls. A stainless steel filter screen is fixed to the inside of the dehumidification side opening 13 by bolts. The edge of the filter screen is wrapped with a nitrile rubber sealing ring. The air inlet of the centrifugal fan 14 is connected to the top of the inner side of the drying chamber 11 through a telescopic hose. The space between the heating layer 12 and the inner wall of the drying chamber 11 is filled with high-temperature resistant ceramic fiber cotton. Four sets of U-shaped electric heating tubes are fixed inside the heating layer 12 by ceramic brackets. The heating tubes are covered with quartz sleeves, and the two ends of the sleeves are sealed with silicone plugs. When the temperature and humidity sensor 15 detects that the humidity inside the chamber is ≥60%RH, the operation panel automatically sends a signal to turn on the centrifugal fan 14. Fresh air enters the chamber after being filtered by the filter screen of the dehumidification side opening 13. When the humidity drops to 45%RH, the centrifugal fan 14 is turned off.

[0040] The hot air blower 21 is fixed by a mounting base with shock-absorbing pads. The mounting base is connected to the top of the dryer housing 11 by expansion bolts. The hot air blower 21 is connected to the control panel via an RVV3×1.5mm cable. 2 The wiring is connected, and the panel is equipped with a rotary temperature adjustment knob and a fan speed switch; open the box door 16, pull the rack 41 to the limit position, place the cartons in layers, close the box door 16, rotate the temperature knob to the target value, switch to the corresponding fan speed setting, press the start button, the hot air blower 21 runs, and the hot air is blown at a 45° angle to the surface of the carton through the first air supply pipe 22 and the diversion pipe 23 from the drying nozzle 24.

[0041] A rubber shock-absorbing pad is provided between the mounting base of the circulating fan 31 and the top of the dryer box 11. The air inlet of the circulating fan 31 is connected to the second air supply pipe 32 through a threaded joint. The joint is sealed with PTFE tape. The bottom of the second air supply pipe 32 is connected to the top of the filter box 33 through a flange. After the hot air flows through the cardboard box, the airflow carrying water vapor enters the filter box 33 from the air inlet pipe 35. The circulating fan 31 transports the purified airflow to the top of the heating layer 12 through the circulation pipe 36. After mixing with the heat generated by the heating pipe, it re-enters the circulation, forming a closed loop.

[0042] The outlet of the circulating fan 31 is connected to the circulating pipe 36 via a quick-connect flange. The flange face is fitted with a heat-resistant asbestos gasket. The circulating pipe 36 is made of φ80mm galvanized steel pipe and extends vertically downward along the inner wall of the dryer box 11 to a position 100mm above the heating layer 12. The filter box 33 contains a filter layer 34 that is slidably connected to its inner wall through a groove. The filter layer 34 contains a double-layer filter screen with an upper 50-mesh metal mesh and a lower activated carbon felt. The airflow carrying water vapor enters the filter box 33 from the air inlet pipe 35. The filter layer 34 is used to trap paper scraps and impurities.

[0043] The bearing plate 44 is symmetrically fixed to the inner wall of the dryer box 11 by L-shaped corner brackets. The corner brackets are bolted to the box body. The locking strip 42 is a T-shaped structure that slides with the guide rail 45. The mating surface is coated with high-temperature grease. When installing the rack 41, align the locking strip 42 with the front inclined surface of the guide rail 45 and push it in at a uniform speed until it contacts the limiting block. During the drying process, the airflow forms a disturbance at the bottom of the carton through the guide groove 43. When taking out the material, hold the front handle of the rack 41 and pull it out smoothly along the guide rail 45 to the outer 1 / 2 position of the box door before taking out and placing the carton.

[0044] A rectangular circulation groove 46 is provided on the inner side of the support plate 44. The circulation groove 46 extends along the width direction of the support plate 44, and the inner wall of the circulation groove 46 is coated with a high-temperature resistant enamel layer. The circulation groove 46 serves as a channel for the flow of gas inside the drying chamber 11, thereby facilitating the circulation of hot air and the flow of humid gas. At the same time, some hot air forms a transverse airflow through the circulation groove 46, which crosses with the longitudinal airflow to reduce the temperature gradient inside the drying chamber 11.

[0045] The working principle of this utility model is as follows: When in use, open the door 16, pull the rack 41 to the limit position, place the cardboard boxes in layers, close the door 16, rotate the temperature knob to the target value, set it to the corresponding fan speed, press the start button, and the hot air blower 21 will run. Hot air will be blown at a 45° angle from the drying nozzle 24 through the first air duct 22 and the diversion pipe 23 onto the surface of the cardboard box. After the hot air flows through the cardboard box, the airflow carrying moisture enters the filter box 33 through the air inlet pipe 35. The circulating fan 31 transports the purified airflow through the circulation pipe 36 to the area above the heating layer 12, where it mixes with the heat generated by the heating pipe and re-enters the circulation, forming a closed loop. When the temperature and humidity sensor 15 detects that the humidity inside the chamber is ≥60%RH, the operation panel automatically sends a signal to turn on the centrifugal fan 14. Fresh air enters the chamber after being filtered through the filter screen of the exhaust port 13. When the humidity drops to 45%RH, the centrifugal fan 14 is turned off, and the airflow carrying moisture enters the filter box 33 through the air inlet pipe 35. Layer 34 is used to trap paper scraps and impurities. The opening of the circulation groove 46 provides a channel for the flow of gas inside the drying chamber 11, which facilitates the circulation of hot air and the flow of humid gas. At the same time, some hot air forms a horizontal airflow through the circulation groove 46, which crosses with the vertical airflow to reduce the temperature gradient inside the drying chamber 11. During the drying process, the temperature and humidity sensor 15 transmits data to the LCD display of the operation panel in real time with an accuracy of ±1℃ / ±2%RH. After the drying program is completed, press the confirmation button on the panel. When the display shows that the temperature inside the chamber is ≤35℃, pull the handle of the chamber door 16 to open it to avoid the hot air overflowing and causing burns. When installing the rack 41, align the clip 42 with the front inclined surface of the guide rail 45 and push it in at a uniform speed until it contacts the limit block. During the drying process, the airflow forms a disturbance at the bottom of the carton through the guide groove 43. When taking out the material, hold the front handle of the rack 41 and pull it out smoothly along the guide rail 45 to the outer 1 / 2 position of the chamber door before taking out or placing the carton.

[0046] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A convenient heat circulation cardboard drying device, comprising a drying assembly (1), a hot air assembly (2), a circulation assembly (3), and a loading assembly (4), wherein the drying assembly (1) comprises a drying chamber (11), the hot air assembly (2) comprises a hot air blower (21), the circulation assembly (3) comprises a circulating fan (31), and the loading assembly (4) comprises a loading rack (41) and a support plate (44), characterized in that: The bottom of the inner side of the drying chamber (11) is fixedly connected to the heating layer (12) by countersunk bolts. The drying chamber (11) has symmetrically opened exhaust side openings (13) on both sides of the side walls. The top of the drying chamber (11) is sealed with a centrifugal fan (14) by a flange. A heat-resistant silicone sealing ring is sandwiched between the flanges. The output end of the hot air blower (21) is connected to the first air supply pipe (22) by a quick-release clamp. A diversion pipe (23) is welded at equal intervals on one side of the first air supply pipe (22). The lower end of the diversion pipe (23) is threadedly connected to the drying nozzle (24). The outer wall of the drying chamber (11) is fixedly connected to the filter box (33) by a corner bracket. The two ends of the rack (41) are symmetrically welded with clips (42). The lower surface of the rack (41) is integrally formed with a guide groove (43). One end of the bearing plate (44) is milled with guide rails (45) at equal intervals.

2. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: The outer wall of the drying chamber (11) is fixedly connected to a temperature and humidity sensor (15) by screws. The probe of the temperature and humidity sensor (15) penetrates the wall through a waterproof connector and extends to the middle of the inner side of the drying chamber (11). The gap between the sensor and the wall is filled with fireproof sealant. The front end of the drying chamber (11) is rotatably connected to a door (16) by a stainless steel hinge. The door (16) has a magnetic strip on the edge that contacts the chamber. The door (16) has a 3mm thick tempered glass observation window in the middle. The edge sealing strip is made of silicone rubber material that can withstand 200℃.

3. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: The drying chamber (11) has symmetrically arranged dehumidification side openings (13) on both ends of the wall. A stainless steel filter screen is fixed inside the dehumidification side opening (13) by bolts. The edge of the filter screen is wrapped with a nitrile rubber sealing ring. The air inlet of the centrifugal fan (14) is connected to the top of the inner side of the drying chamber (11) through a telescopic hose. The space between the heating layer (12) and the inner wall of the drying chamber (11) is filled with high-temperature resistant ceramic fiber cotton. Four sets of U-shaped electric heating tubes are fixed inside the heating layer (12) by ceramic brackets. The heating tubes are covered with quartz sleeves, and the two ends of the sleeves are sealed with silicone plugs.

4. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: The hot air blower (21) is fixed by a mounting base with shock-absorbing pads. The mounting base is connected to the top of the drying chamber (11) by expansion bolts. The hot air blower (21) is connected to the control panel by RVV3×1.5mm. 2 The wiring is connected, and the panel has a rotary temperature control knob and a fan speed switch.

5. The convenient heat circulation carton drying device according to claim 1, characterized in that: A rubber shock-absorbing pad is provided between the mounting base of the circulating fan (31) and the top of the dryer box (11). The air inlet of the circulating fan (31) is connected to the second air supply pipe (32) through a threaded joint. The joint is sealed with PTFE tape. The bottom of the second air supply pipe (32) is connected to the top of the filter box (33) through a flange.

6. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: The outlet of the circulating fan (31) is connected to the circulating pipe (36) via a quick-connect flange. The flange face is fitted with a heat-resistant asbestos gasket. The circulating pipe (36) is made of φ80mm galvanized steel pipe and extends vertically downward along the inner wall of the dryer box (11) to a distance of 100mm above the heating layer (12). The filter box (33) contains a filter layer (34) that is slidably connected to the inner wall of the filter layer (34). The filter layer (34) contains a double-layer filter screen with an upper 50-mesh metal mesh and a lower activated carbon felt.

7. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: The bearing plate (44) is symmetrically fixed to the inner wall of the dryer box (11) by L-shaped corner brackets. The corner brackets are bolted to the box body. The clip (42) is a T-shaped structure and slides with the guide rail (45). The mating surface is coated with high-temperature grease.

8. The convenient heat circulation cardboard drying device according to claim 1, characterized in that: A rectangular circulation groove (46) is provided on the inner side of the support plate (44). The circulation groove (46) runs through the width direction of the support plate (44). The inner wall of the circulation groove (46) is coated with a high-temperature resistant enamel layer.

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