A device for increasing the overall hood ambient temperature of a single-cylinder dryer

Abstract

The utility model relates to a device for improving the overall environment temperature of the air hood of single hanging drying cylinder. It solves the technical problems such as the paper web drying efficiency of the existing single hanging drying cylinder part air hood temperature being a little low to affect the drying cylinder. Including the drying cylinder arranged in the air hood, the air supply pipeline is horizontally arranged below the drying cylinder, the air supply pipeline is arranged in parallel with the drying cylinder up and down and the air supply pipeline extends to the other end along the one end of the drying cylinder, the air supply pipeline outside is equipped with a plurality of ventilation openings which are sequentially distributed along the length direction of the air supply pipeline and are arranged towards the drying cylinder, one end of the air supply pipeline is closed and the other end has an opening connected with the drying part ventilation system, and a ventilation valve is arranged between the air supply pipeline and the drying part ventilation system. The advantage is that the air supply pipeline is parallel and equal length with the drying cylinder up and down, a plurality of ventilation openings are spaced apart along the length direction of the pipeline, can cover the surface of the drying cylinder comprehensively, and cooperate with the one-to-one corresponding flow guide structure, can effectively avoid the local air volume uneven, and ensure that the drying cylinder is heated uniformly in each area.

Description

Technical Field

[0001] This utility model belongs to the technical field of hot air supply equipment for drying cylinders, specifically relating to a device for increasing the overall ambient temperature of the air hood of a single-hanging drying cylinder. Background Technology

[0002] In industrial production such as papermaking, textiles, and printing, the drying process is a crucial step in ensuring product quality. Its core involves heating and dehydrating wet materials using equipment such as drying cylinders. In existing technologies, multiple drying cylinders are used, each equipped with an air hood. Previously, single-cage drying cylinders used a bag ventilation system to deliver hot air and maintain the hood temperature. However, this system suffers from cylinder ejection during production. To address this issue, a suction system was implemented, but this resulted in the loss of the hot air delivery function. Consequently, the temperature inside the air hood of some single-cage drying cylinders tends to be lower, especially noticeable in winter or during machine startup, thus affecting the paper web drying efficiency. To solve this problem, a new hot air delivery device is added below the single-cage drying cylinder. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by providing a device for increasing the overall ambient temperature of the hood of a single-mounted drying cylinder.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a device for improving the overall ambient temperature of a single-mounted drying cylinder under a hood, comprising a drying cylinder disposed within the hood, a horizontally arranged air supply duct below the drying cylinder, the air supply duct being arranged vertically parallel to the drying cylinder and extending from one end of the drying cylinder to the other end, a plurality of ventilation openings arranged sequentially along the length of the air supply duct and facing the drying cylinder on the outer side of the air supply duct, one end of the air supply duct being closed and the other end having an opening connected to the ventilation system of the drying section, and a ventilation valve being provided between the air supply duct and the ventilation system of the drying section. The air supply duct is parallel to the drying cylinder and extends along its entire length, ensuring that hot air can evenly cover the entire length of the drying cylinder and avoid localized insufficient drying. This basic layout guarantees the uniformity of drying. One end of the air supply duct is closed, while the other end is connected to the ventilation system through an opening and is equipped with a ventilation valve. The air volume entering the air supply duct can be precisely adjusted through the valve to adapt to different drying needs. At the same time, the connection relationship between the air supply duct and the ventilation system is clearly defined, forming a complete hot air delivery path. This ensures that the hot air is delivered from the system to the drying cylinder without leakage, thereby improving energy utilization.

[0005] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-mounted drying cylinder, the ventilation system of the drying section includes a hot air duct. One end of the hot air duct is connected to an opening by welding. The hot air duct and the supply air duct form an L-shape, and the ventilation valve is located at the end of the hot air duct near the supply air duct. The welding connection between the hot air duct and the supply air duct, forming an L-shape, ensures the sealing of the high-temperature, high-pressure hot air during delivery, avoiding energy waste caused by hot air leakage. The L-shape adapts to spatial layout requirements, reducing resistance caused by duct bends. Simultaneously, the ventilation valve's location at the end of the hot air duct near the supply air duct allows for faster response to airflow adjustment needs, reducing adjustment lag and improving the accuracy of hot air control.

[0006] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-mounted drying cylinder, the inner side of the air supply duct has an air supply cavity, and all the vents are connected to the air supply cavity. Furthermore, the air supply cavity is equipped with a flow guiding structure corresponding to each vent. This one-to-one correspondence between the flow guiding structure and the vents lays the foundation for the uniformity of airflow and velocity at each vent, avoiding localized differences in airflow caused by turbulent airflow within the duct.

[0007] In the above-mentioned device for improving the overall ambient temperature of the air hood of a single-hanging drying cylinder, the flow guiding structure includes several flow guiding parts disposed in the air supply cavity. The flow guiding parts are respectively disposed in correspondence with the ventilation openings. The flow guiding parts are provided with an annular flow guiding shroud on the outer circumferential side. The upper end of the annular flow guiding shroud is provided with a flow guiding pipe extending axially upward to the outer circumferential side of the ventilation opening. The annular flow guiding shroud is provided with a flow guiding component inside.

[0008] In the aforementioned device for increasing the overall ambient temperature of a single-mounted drying cylinder's hood, both the inner side of the annular guide hood and the inner side of the guide pipe have guide channels. The upper end of the guide channel is connected to the vent, and the lower end is connected to the air supply cavity. The diameter of the annular guide hood gradually increases from one end near the guide pipe to the other. This gradually increasing diameter design of the annular guide hood, combined with the vertical connection of the guide channels, gradually increases the flow velocity of the hot air as it passes through the guide channels, enhancing the impact force of the hot air on the drying cylinder and improving drying efficiency. The guide pipe extends to the outer periphery of the vent, forming a surrounding guide for the vent, preventing the hot air from diffusing outwards when it exits the vent, ensuring that the hot air is concentrated and blown onto the drying cylinder, reducing energy loss. The precise connection between the guide channel, the air supply cavity, and the vent forms a complete airflow path, ensuring that the hot air does not stagnate within the guide structure and improving delivery efficiency.

[0009] In the aforementioned device for increasing the overall ambient temperature of a single-mounted drying cylinder's hood, the airflow guiding assembly includes a guide fan blade disposed on the inner side of the center of the annular guide hood. The annular guide hood has a vertically positioned fan blade connecting rod at the end furthest from the guide pipe, connected to the air supply duct. The guide fan blade is connected to the end of the fan blade connecting rod furthest from the air supply duct via a movable bearing. The guide fan blade, connected to the connecting rod via the movable bearing, can automatically rotate with the flow of hot air, dynamically adjusting the fan blade angle according to the airflow speed to achieve the diversion and guidance of hot air, avoiding localized airflow congestion and making the airflow from each vent more uniform. The fan blade connecting rod is directly fixed to the air supply duct, resulting in a simple structure and avoiding additional obstruction to the airflow inside the air supply cavity. The use of the movable bearing reduces the frictional resistance during fan blade rotation.

[0010] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-mounted drying cylinder, an inlet temperature control sensor is installed on the inner side of the air supply duct near the opening, and an outlet temperature control sensor is installed on the inner side of the guide pipe away from the annular guide hood. An axially arranged electric heating tube is installed on the side of the air supply duct away from the vent, and the electric heating tube is connected to both the inlet and outlet temperature control sensors. The inlet sensor monitors the initial temperature of the hot air entering the duct, and the outlet sensor monitors the final temperature of the hot air delivered to the drying cylinder, forming a dual-point monitoring system for both inlet and outlet. This allows for comprehensive monitoring of hot air temperature changes, ensuring compliance with drying process requirements. The electric heating tube is linked to the dual sensors; when the outlet temperature is lower than the set value, heating automatically starts; when the temperature is higher than the set value, heating stops, achieving closed-loop temperature control. This prevents temperature fluctuations from affecting drying quality. Real-time sensor monitoring can promptly detect temperature anomalies, preventing overheating of the duct due to excessive heating of the electric heating tube, thus improving the operational safety of the device.

[0011] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder, the number of ventilation openings is 16, and the ventilation openings are distributed axially at intervals.

[0012] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder, the length of the ventilation opening is 300mm and the width of the ventilation opening is 35mm.

[0013] In the aforementioned device for increasing the overall ambient temperature of the hood of a single-mounted drying cylinder, the length of the air supply duct is 6200mm, the diameter of the air supply duct is 250mm, and the length of the drying cylinder is equal to the length of the air supply duct.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] 1. The air supply duct of this device is parallel to the top and bottom of the drying cylinder and of equal length. Several ventilation openings are distributed at intervals along the length of the duct, which can fully cover the surface of the drying cylinder. At the same time, with the corresponding air guiding structure, it can effectively avoid uneven local air volume, ensure that all areas of the drying cylinder are heated evenly, and improve the drying quality.

[0016] 2. This device forms a complete hot air path from the ventilation system of the drying section to the drying cylinder. The ventilation valve is close to the air supply duct, which can quickly adjust the total air volume. The inlet and outlet air temperature control sensors are linked to the electric heating tube, which can monitor and control the hot air temperature in real time, thus meeting the needs of different drying processes and reducing energy waste.

[0017] 3. The hot air duct and the air supply duct of this device are connected by welding, which has strong sealing performance. The L-shaped structure is suitable for spatial layout. At the same time, the gradually changing diameter design of the annular guide shroud combined with the guide pipe enhances the impact force of hot air and reduces diffusion loss. Furthermore, the guide fan blades are connected by movable bearings, which can adaptively adjust with the airflow to further optimize the uniformity of air output. The overall structure takes into account both functionality and energy saving. Attached Figure Description

[0018] Figure 1 This is a plan view of the present invention.

[0019] Figure 2 This is a schematic diagram of the air supply duct in this utility model.

[0020] Figure 3 This is a partial schematic diagram of the air supply duct in this utility model.

[0021] Figure 4 This is a partial cross-sectional view of the air supply duct in this utility model.

[0022] In the diagram: 1. Drying cylinder; 2. Air supply duct; 21. Ventilation port; 22. Opening; 23. Air supply cavity; 3. Drying section ventilation system; 31. Ventilation valve; 32. Hot air duct; 4. Guide structure; 41. Guide section; 42. Annular guide hood; 43. Guide pipe; 44. Guide channel; 5. Guide fan blade; 51. Fan blade connecting rod; 52. Inlet air temperature control sensor; 6. Outlet air temperature control sensor; 61. Electric heating tube; 62. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1-4As shown, a device for increasing the overall ambient temperature of a single-mounted drying cylinder under an air hood includes a drying cylinder 1 installed inside the air hood. A horizontally arranged air supply duct 2 is provided below the drying cylinder 1. The air supply duct 2 is arranged vertically parallel to the drying cylinder 1 and extends from one end of the drying cylinder 1 to the other end. Several ventilation openings 21 are arranged on the outside of the air supply duct 2 along the length of the air supply duct 2 and facing the drying cylinder 1. One end of the air supply duct 2 is closed and the other end has an opening 22 connected to the ventilation system 3 of the drying section. A ventilation valve 31 is provided between the air supply duct 2 and the ventilation system 3 of the drying section. The air supply duct 2 is parallel to the drying cylinder 1 and extends along the entire length of the drying cylinder 1, ensuring that the hot air can evenly cover the entire length of the drying cylinder 1 and avoid insufficient drying in some areas. The basic layout ensures the uniformity of drying. One end of the air supply duct 2 is closed and the other end is connected to the ventilation system through the opening 22. A ventilation valve 31 is installed, which can precisely adjust the air volume entering the air supply duct to adapt to different drying needs. At the same time, the connection relationship between the air supply duct 2 and the ventilation system is clearly defined, forming a complete hot air delivery path, ensuring that the hot air is delivered from the system to the drying cylinder 1 without leakage and improving energy utilization.

[0025] Combination Figure 1 and Figure 2 As shown, the drying unit ventilation system 3 includes a hot air duct 32. One end of the hot air duct 32 is connected to the opening 22 by welding. The hot air duct 32 and the air supply duct 2 form an L-shaped structure, and the ventilation valve 31 is located at the end of the hot air duct 32 near the air supply duct 2. The hot air duct 32 and the air supply duct 2 are connected by welding and form an L-shaped structure. The welding connection ensures the sealing of the hot air during high-temperature and high-pressure hot air transportation, avoiding energy waste caused by hot air leakage. The L-shaped structure adapts to the spatial layout requirements and reduces the resistance caused by pipe bends. At the same time, the ventilation valve 31 is located at the end of the hot air duct 32 near the air supply duct 2, which allows for a faster response to airflow adjustment needs, reduces adjustment lag, and improves the accuracy of hot air control.

[0026] Combination Figure 3 and Figure 4 As shown, the air supply duct 2 has an air supply cavity 23 inside, and the vents 21 are all connected to the air supply cavity 23. The air supply cavity 23 is provided with a flow guiding structure 4 corresponding to the vents 21. The flow guiding structure 4 corresponds one-to-one with the vents 21, which lays the foundation for the uniformity of air volume and air velocity of each vent 21 from the design, and avoids local air outlet differences caused by airflow turbulence in the duct.

[0027] The flow guiding structure 4 includes several flow guiding parts 41 disposed in the air supply cavity 23. The flow guiding parts 41 are respectively disposed in correspondence with the ventilation openings 21. The flow guiding parts 41 are provided with an annular flow guiding cover 42 on the outer side of the circumference. The upper end of the annular flow guiding cover 42 is provided with a flow guiding pipe 43 extending axially upward to the outer side of the ventilation opening 21. The annular flow guiding cover 42 is provided with a flow guiding component 5.

[0028] Specifically, both the inner side of the annular guide hood 42 and the inner side of the guide pipe 43 have guide channels 44. The upper end of the guide channel 44 is connected to the vent 21 and the lower end is connected to the air supply cavity 23. The diameter of the annular guide hood 42 gradually increases from one end near the guide pipe 43 to the other end. The design of the gradually increasing diameter of the annular guide hood 42, combined with the vertical connection of the guide channel 44, allows the flow velocity of hot air to gradually increase when passing through the guide channel 44, enhancing the impact force of the hot air on the drying cylinder and improving drying efficiency. The guide pipe 43 extends to the circumference of the vent 21 and outwards, forming a surrounding guide for the vent 21, preventing the hot air from spreading in all directions when it is sent out of the vent 21, ensuring that the hot air is concentrated and blown onto the drying cylinder 1, reducing energy loss. The precise connection between the guide channel 44, the air supply cavity 23, and the vent 21 forms a complete airflow path, ensuring that the hot air does not stagnate in the guide structure 4, and improving delivery efficiency.

[0029] Meanwhile, the airflow guiding assembly 5 includes a guide fan blade 51 disposed on the inner side of the middle of the annular airflow guiding shroud 42. A vertically arranged fan blade connecting rod 52, connected to the air supply duct 2, is provided at the end of the annular airflow guiding shroud 42 away from the airflow guiding pipe 43. The guide fan blade 51 is connected to the end of the fan blade connecting rod 52 away from the air supply duct 2 via a movable bearing. The guide fan blade 51 is connected to the connecting rod via the movable bearing and can automatically rotate with the flow of hot air. The fan blade angle is dynamically adjusted according to the airflow speed to achieve the diversion and guidance of hot air, avoiding local airflow congestion and making the airflow from each vent 21 more uniform. The fan blade connecting rod 52 is directly fixed to the air supply duct 2, resulting in a simple structure and avoiding additional obstruction to the airflow inside the air supply cavity 23. The use of the movable bearing reduces the frictional resistance during fan blade rotation.

[0030] Combination Figure 1 and Figure 4As shown, an inlet temperature sensor 6 is installed on the inner side of the air supply duct 2 near the opening 22, and an outlet temperature sensor 61 is installed on the inner side of the guide pipe 43 away from the annular guide shroud 42. An axially arranged electric heating tube 62 is installed on the inner side of the air supply duct 2 away from the vent 21, and the electric heating tube 62 is connected to both the inlet temperature sensor 6 and the outlet temperature sensor 61. The inlet sensor monitors the initial temperature of the hot air entering the duct, and the outlet sensor monitors the temperature of the hot air finally delivered to the drying cylinder 1, forming a dual-point monitoring system for both inlet and outlet. This allows for comprehensive monitoring of hot air temperature changes and ensures compliance with drying process requirements. The electric heating tube 62 is linked with the dual sensors. When the outlet temperature is lower than the set value, heating is automatically started; when the temperature is higher than the set value, heating is stopped, achieving closed-loop temperature control. This prevents temperature fluctuations from affecting drying quality. Real-time sensor monitoring can promptly detect temperature anomalies, preventing overheating of the duct due to overheating of the electric heating tube 62, thus improving the operational safety of the device.

[0031] Combination Figure 1 and Figure 2 As shown, there are 16 ventilation openings 21, and the ventilation openings 21 are distributed sequentially at intervals along the axial direction.

[0032] The length of the vent 21 is 300mm and the width of the vent 21 is 35mm.

[0033] Specifically, the length of the air supply duct 2 is 6200mm, the diameter of the air supply duct 2 is 250mm, and the length of the drying cylinder 1 is equal to the length of the air supply duct 2.

[0034] The principle of this embodiment is as follows:

[0035] The drying section ventilation system 3 delivers hot air to the air supply duct 2 via the hot air duct 32. The hot air enters the air supply cavity 23 of the air supply duct 2 via the hot air duct 32 and the air supply duct 2. A ventilation valve 31 located at one end of the hot air duct 32 near the air supply duct 2 can adjust the total air volume entering the air supply cavity 23 by adjusting its opening degree to adapt to different drying needs of the drying cylinder 1. The flow guiding structure 4 inside the air supply cavity 23 corresponds one-to-one with the vents 21. Each vent 21 forms an independent flow guiding channel 44 through the flow guiding pipe 43 and the annular flow guiding hood 42. After the hot air enters the air supply cavity 23, it is distributed to each flow guiding channel 44 to avoid local air volume differences caused by airflow turbulence in the duct. The diameter of the annular flow guiding hood 42 gradually increases from one end near the flow guiding pipe 43 to the other end. Combined with the vertical extension structure of the flow guiding pipe 43, the flow velocity of the hot air gradually increases in the flow guiding channel 44 and is precisely guided to the vent 21 through the flow guiding pipe 43, reducing hot air diffusion loss and enhancing air quality. The impact force on the drying cylinder 1 is achieved by the guide fan blades 51 inside the annular guide shroud 42, which are connected to the fan blade connecting rod 52 via a movable bearing. When the hot air flows, it will drive the guide fan blades 51 to rotate. The airflow is further sorted through the adaptive adjustment of the fan blade angle, balancing the air outlet speed and direction of each vent 21, and ensuring that the surface of the drying cylinder 1 is heated evenly. The inlet air temperature control sensor 6 is installed at one end of the air supply duct 2 near the opening 22 to monitor the initial hot air temperature entering the air supply cavity 23 in real time. The outlet air temperature control sensor 61 is installed at the outlet end of the guide pipe 43 to monitor the actual hot air temperature that will be blown onto the drying cylinder 1 through the vent 21. The electric heating tube 62 inside the air supply duct 2 is linked with the two sensors. When the outlet air temperature control sensor 61 detects that the temperature is lower than the set value, the electric heating tube 62 automatically starts to reheat the hot air in the air supply cavity 23. When the temperature reaches the standard, the electric heating tube 62 stops working to ensure that the hot air temperature blown onto the drying cylinder 1 is stable.

[0036] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0037] Although this document frequently uses terms such as drying cylinder 1, air supply duct 2, vent 21, opening 22, air supply cavity 23, drying section ventilation system 3, ventilation valve 31, hot air duct 32, flow guiding structure 4, flow guiding part 41, annular flow guiding cover 42, flow guiding pipe 43, flow guiding channel 44, flow guiding assembly 5, flow guiding fan blade 51, fan blade connecting rod 52, inlet air temperature control sensor 6, outlet air temperature control sensor 61, and electric heating tube 62, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A device for increasing the overall ambient temperature of a single-mounted drying cylinder under an air hood, comprising a drying cylinder (1) disposed within the air hood, characterized in that, The drying cylinder (1) is provided with a horizontally arranged air supply duct (2) below it. The air supply duct (2) is arranged vertically and horizontally with the drying cylinder (1) and extends from one end of the drying cylinder (1) to the other end. The outer side of the air supply duct (2) is provided with a number of ventilation openings (21) arranged sequentially along the length of the air supply duct (2) and facing the drying cylinder (1). One end of the air supply duct (2) is closed and the other end has an opening (22) connected to the ventilation system (3) of the drying section. A ventilation valve (31) is provided between the air supply duct (2) and the ventilation system (3) of the drying section.

2. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 1, characterized in that, The drying section ventilation system (3) includes a hot air duct (32), one end of which is connected to the opening (22) by welding. The hot air duct (32) and the air supply duct (2) are in an L-shaped structure, and the ventilation valve (31) is located at the end of the hot air duct (32) near the air supply duct (2).

3. A device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 1 or 2, characterized in that, The air supply duct (2) has an air supply cavity (23) inside, and the ventilation openings (21) are all connected to the air supply cavity (23). The air supply cavity (23) is provided with a flow guiding structure (4) corresponding to the ventilation openings (21).

4. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 3, characterized in that, The flow guiding structure (4) includes several flow guiding parts (41) arranged in the air supply cavity (23). The flow guiding parts (41) are respectively arranged in correspondence with the ventilation openings (21). The flow guiding parts (41) are provided with an annular flow guiding cover (42) on the outer side of the circumference. The upper end of the annular flow guiding cover (42) is provided with a flow guiding pipe (43) extending axially upward to the outer side of the ventilation opening (21). The annular flow guiding cover (42) is provided with a flow guiding component (5).

5. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 4, characterized in that, The inner side of the annular flow guide shroud (42) and the inner side of the flow guide pipe (43) both have flow guide channels (44). The upper end of the flow guide channel (44) is connected to the vent (21) and the lower end is connected to the air supply cavity (23). The diameter of the annular flow guide shroud (42) gradually increases from one end near the flow guide pipe (43) to the other end.

6. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 4, characterized in that, The flow guiding assembly (5) includes a flow guiding fan blade (51) disposed on the inner side of the middle part of the annular flow guiding cover (42). The annular flow guiding cover (42) has a vertically arranged fan blade connecting rod (52) connected to the air supply pipe (2) at the end away from the flow guiding pipe (43). The flow guiding fan blade (51) is connected to the end of the fan blade connecting rod (52) away from the air supply pipe (2) through a movable bearing.

7. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 4, characterized in that, An air inlet temperature control sensor (6) is provided on the inner side of the air supply duct (2) near the opening (22), and an air outlet temperature control sensor (61) is provided on the inner side of the guide pipe (43) away from the annular guide shroud (42). An axially arranged electric heating tube (62) is provided on the side of the air supply duct (2) away from the vent (21), and the electric heating tube (62) is connected to the air inlet temperature control sensor (6) and the air outlet temperature control sensor (61) respectively.

8. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 1, characterized in that, The number of ventilation openings (21) is 16, and the ventilation openings (21) are distributed axially at intervals.

9. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 1, characterized in that, The length of the ventilation opening (21) is 300mm and the width of the ventilation opening (21) is 35mm.

10. The device for increasing the overall ambient temperature of the hood of a single-hanging drying cylinder according to claim 1, characterized in that, The length of the air supply duct (2) is 6200mm, the diameter of the air supply duct (2) is 250mm, and the length of the drying cylinder (1) is equal to the length of the air supply duct (2).

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