Method for setting air intake and exhaust volume of coating machine oven

Abstract

The application provides a method for setting the air inlet and air outlet of a coating machine oven, comprising the following steps: S1, starting the air inlet system of the oven and starting the air outlet system of the oven; S2, adjusting the air inlet speed of the air inlet system to a preset value; S3, detecting the air pressure inside the oven through the air pressure detection of the inside of the feeding port and discharging port of the oven, obtaining the air pressure value of the oven, and comparing the air pressure value with the preset air pressure range value; if the air pressure value is not within the preset air pressure range value, executing step S4; S4, keeping the air inlet speed of the air inlet system unchanged, adjusting the air outlet speed of the air outlet system according to the numerical characteristics of the air pressure value, and returning to step S3. The application takes the air inlet speed of the air inlet system and the air pressure value inside the oven as the standard for whether the air inlet and air outlet of the coating machine oven meet the standard, and when the air inlet speed of the air inlet system and the air pressure value are within the preset air pressure range value, it indicates that the air inlet and air outlet of the coating machine oven have met the standard. In this way, the application can reduce the difficulty of adjusting and setting the air inlet and air outlet of the coating machine oven.

Description

Technical Field

[0001] This invention relates to the field of coating machine oven technology, and in particular to a method for setting the air inlet and exhaust volume of a coating machine oven. Background Technology

[0002] Anti-counterfeiting laser packaging materials, due to their anti-counterfeiting functions, vibrant colors and patterns, and dynamic or 3D effects, provide a strong visual impact and are widely used in packaging for cigarettes, wine, toothpaste, cosmetics, and medicine, as well as in printed materials such as advertisements, brochures, and decorations. They are particularly effective for product promotion and advertising. The key to processing anti-counterfeiting laser packaging materials lies in the production of laser film. Currently, the main research and development direction for laser film is environmentally friendly laser transfer film with a biodegradable transfer coating and a reusable base film.

[0003] The production of laser transfer film focuses on two key processes: coating and molding. The quality and stability of the coating process directly determine the quality of the molded product and the overall pass rate of the laser film. Three key indicators affecting the coating process are: coating leveling, dry coating weight, and drying effect. Coating leveling and dry coating weight can be monitored and adjusted in real-time using methods such as stroboscope illumination, visual inspection, and weighing. However, the drying effect can only be determined after subsequent molding and solvent residue testing, which is a time lag. Substandard quality leads to material waste. Currently, the main factors affecting drying effect include air intake volume, exhaust volume, and oven temperature. Adjusting these parameters to a reasonable range before the coating process can reduce the probability of substandard product quality. Oven temperature is relatively easy to measure and adjust. However, due to limitations in piping space, cost, and technology, most coating machine ovens currently lack airflow detection devices in their inlet and outlet pipes, making it difficult to monitor the inlet and outlet airflow. This results in significant challenges in adjusting and setting the oven's inlet and outlet airflow.

[0004] Therefore, it is necessary to provide a method that reduces the difficulty of setting the air intake and exhaust volume of the coating machine oven. Summary of the Invention

[0005] This invention proposes a method for setting the air intake and exhaust volume of a coating machine oven, which reduces the difficulty of setting the air intake and exhaust volume of the coating machine oven.

[0006] The technical solution adopted in this invention is as follows:

[0007] A method for setting the air inlet and exhaust volume of a coating machine oven includes the following steps:

[0008] S1. Turn on the oven's air intake system and exhaust system;

[0009] S2. Adjust the air intake speed of the air intake system to the preset value;

[0010] S3. By detecting the air pressure inside the oven's inlet and outlet, obtain the air pressure value inside the oven and compare it with the preset air pressure range value; if the air pressure value is not within the preset air pressure range value, proceed to step S4.

[0011] S4. Keep the air intake speed of the air intake system constant, and adjust the exhaust speed of the exhaust system according to the numerical characteristics of the air pressure value, and return to step S3.

[0012] In one embodiment, in step S4, when the exhaust speed of the exhaust system reaches its maximum or minimum value, the exhaust speed of the exhaust system is kept constant, the intake speed of the intake system is increased or decreased, and the process returns to step S3.

[0013] In one embodiment, the exhaust system includes branch exhaust ducts and branch exhaust fans mounted on the branch exhaust ducts; the branch exhaust ducts connect to the interior of the drying oven.

[0014] In step S4, the speed of the branch exhaust fan is adjusted by changing the frequency of the inverter of the branch exhaust fan to increase or decrease the speed of the branch exhaust fan, thereby adjusting the exhaust speed of the exhaust system.

[0015] In one embodiment, the exhaust system further includes a main exhaust duct and a main exhaust fan installed on the main exhaust duct, and the main exhaust duct is connected to the branch exhaust ducts;

[0016] In step S4, when the speed of the branch exhaust fan is adjusted to the maximum or minimum, the speed of the main exhaust fan is increased or decreased by changing the frequency of the inverter of the main exhaust fan, thereby increasing or decreasing the exhaust speed of the exhaust system.

[0017] In one embodiment, the exhaust system includes a main exhaust duct, branch exhaust ducts, a main exhaust fan installed on the main exhaust duct, and branch exhaust fans installed on the branch exhaust ducts; the branch exhaust ducts connect the main exhaust duct and the interior of the oven; the branch exhaust ducts are equipped with branch exhaust dampers, and the main exhaust duct is equipped with a main exhaust damper;

[0018] In step S1, the process of starting the exhaust system includes: starting the main exhaust fan and the branch exhaust fan, and opening the branch exhaust damper and the main exhaust damper to their maximum values.

[0019] In one embodiment, the air intake system includes a main air intake duct, branch air intake ducts, a main air intake fan mounted on the main air intake duct, and branch air intake fans mounted on the branch air intake ducts; the branch air intake ducts connect the main air intake duct and the interior of the oven; the main air intake duct is provided with a main air intake damper; the branch air intake ducts are provided with branch air intake dampers.

[0020] In step S1, the process of starting the air intake system includes: starting the main air intake fan and the branch air intake fan, and opening the main air intake damper and the branch air intake damper to their maximum values.

[0021] In one embodiment, step S2, adjusting the air intake speed of the air intake system to a preset value, includes:

[0022] S21: Detect the air intake speed of the air intake system;

[0023] S22: Compare the air intake speed of the air intake system with the preset value. If the air intake speed of the air intake system is different from the preset value, proceed to step S23. If the air intake speed of the air intake system is the same as the preset value, proceed to step S3.

[0024] S23: Adjust the speed of the branch intake fan by changing the frequency of the frequency converter of the branch intake fan, thereby adjusting the intake speed of the intake system, and / or adjust the speed of the main intake fan by changing the frequency of the frequency converter of the main intake fan, thereby increasing or decreasing the intake speed of the intake system.

[0025] In one embodiment, the air intake system further includes a cold air duct and a cold air damper disposed on the cold air duct; the cold air duct is connected to a branch air intake duct, and the connection between the branch air intake duct and the cold air duct is located between the branch air intake fan and the main air intake duct;

[0026] In step S1, the process of turning on the air intake system also includes: closing the cold air damper.

[0027] In one embodiment, in step S23, the cold air damper is opened, thereby increasing the air intake speed of the air intake system.

[0028] The beneficial effects of this invention are:

[0029] This application uses the air intake velocity of the air intake system and the air pressure inside the oven as the standard for whether the air intake and exhaust volume of the coating machine oven meet the standards. When the air intake velocity and air pressure of the air intake system are within the preset range, it indicates that the air intake and exhaust volume of the coating machine oven have met the standards. This application reduces the difficulty of adjusting and setting the air intake and exhaust volume of the coating machine oven by means of this method.

[0030] In addition, during the process of adjusting the air pressure inside the oven inlet and outlet, this application first adjusts the air inlet speed to the preset value and keeps the air inlet speed unchanged. In this way, only the exhaust speed needs to be adjusted afterward, without having to frequently adjust the air inlet speed, which can reduce the difficulty of adjusting the air pressure inside the inlet and outlet to a certain extent.

[0031] Furthermore, based on industry experience, this application can also manually set the preset value of the air intake speed to a suitable value to ensure that the energy consumption of the air intake system remains at a low level at this value. Then, only the exhaust speed needs to be adjusted to bring the air pressure inside the oven's inlet and outlet within the preset range. In this way, the technical effect of reducing energy consumption can be achieved. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but should not be construed as limiting the invention. In the drawings,

[0033] Figure 1 This is a schematic diagram of the exhaust system, air inlet system, and oven according to Embodiment 1 of the present invention;

[0034] Figure 2 This is a schematic diagram of the exhaust system, air intake system, and oven of Embodiment 2 of the present invention.

[0035] Attached image annotations:

[0036] 10. Main air intake duct; 11. Main air intake damper; 12. Main air intake fan;

[0037] 20. Branch air inlet duct; 21. Branch air inlet damper; 22. Branch air inlet fan;

[0038] 30. Cooling air duct; 31. Cooling air damper;

[0039] 40. Drying oven;

[0040] 50. Main exhaust duct; 51. Main exhaust fan; 52. Main exhaust damper;

[0041] 60. Branch exhaust duct; 61. Branch exhaust fan; 62. Branch exhaust damper;

[0042] 70. Circulating air duct; 71. Circulating air damper. Detailed Implementation

[0043] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0044] Please see Figure 1This embodiment discloses a method for setting the air inlet and exhaust volume of a coating machine oven. This method is used to set the air inlet and exhaust volume of the coating machine oven 40 to an optimal range based on the actual product manufacturing process requirements before the coating machine is officially put into use. This improves the quality of subsequent products and avoids excessive air inlet leading to energy waste or insufficient air inlet affecting drying efficiency. The coating machine includes at least an oven 40, an exhaust system, and an air inlet system. The oven 40 includes a feed inlet and a discharge outlet, with the discharge outlet located on the left and the feed inlet on the right. The coating substrate enters the oven 40 through the feed inlet and exits through the discharge outlet. A heating device is installed inside the oven 40 to dry the substrate.

[0045] The air intake system includes a main air intake duct 10, branch air intake ducts 20, a main air intake fan 12 mounted on the main air intake duct 10, a branch air intake fan 22 mounted on the branch air intake ducts 20, a cold air duct 30, a cold air damper 31 mounted on the cold air duct 30, and a circulating air duct 70 connecting to the oven 40. The branch air intake duct 20 connects the main air intake duct 10 and the interior of the oven 40. Specifically, the oven 40 has multiple nozzles, and the branch air intake duct 20 connects to each nozzle to provide airflow. The main air intake duct 10 has a main air intake damper 11. The branch air intake duct 20 has a branch air intake damper 21. The cold air duct 30 connects to the branch air intake duct 20, and the connection point between the branch air intake duct 20 and the cold air duct 30 is located between the branch air intake fan 22 and the main air intake duct 10. The circulating air duct 70 has a circulating damper 71.

[0046] The exhaust system includes a main exhaust duct 50, branch exhaust ducts 60, a main exhaust fan 51 installed on the main exhaust duct 50, and branch exhaust fans 61 installed on the branch exhaust ducts 60. The branch exhaust ducts 60 connect the main exhaust duct 50 and the interior of the oven 40; the branch exhaust ducts 60 are equipped with branch exhaust dampers 62, and the main exhaust duct 50 is equipped with a main exhaust damper 52.

[0047] The method for setting the air inlet and exhaust volume of the coating machine oven in this embodiment includes the following steps:

[0048] S1. Turn on the air intake system of oven 40 and turn on the exhaust system of oven 40.

[0049] The process of starting the air intake system includes starting the main air intake fan 12 and the branch air intake fan 22, and opening the branch air intake damper 21 and the main air intake damper 11 to their maximum values. In this way, the air intake speed of the air intake system can be adjusted by simply adjusting the rotation speed of the main air intake fan 12 and / or the branch air intake fan 22. The air intake speed of the air intake system is the air intake speed of the branch air intake pipe 20.

[0050] The process of starting the exhaust system includes: turning on the main exhaust fan 51 and the branch exhaust fan 61, and opening the branch exhaust damper 62 and the main exhaust damper 52 to their maximum values. In this way, the exhaust speed of the air intake system can be adjusted by simply adjusting the rotation speed of the main exhaust fan 51 and / or the branch exhaust fan 61. The exhaust speed of the exhaust system is the exhaust speed of the branch exhaust duct 60.

[0051] The cold air damper 31 is in the closed state, which can prevent the cold air damper 31 from drawing in cold air and lowering the temperature inside the oven 40, thereby avoiding increasing the energy consumption required to maintain a constant temperature inside the oven 40.

[0052] The preset opening of the circulating damper 71.

[0053] S2. Adjust the air intake speed of the air intake system to the preset value.

[0054] In particular, if the air intake speed of the air intake system is too low, the drying effect will be poor, and if the air intake speed is too high, the energy consumption will be high. Therefore, the preset value must be kept within a suitable range, and this preset value can be set by the staff based on experience.

[0055] The process of adjusting the air intake speed of the air intake system to a preset value includes:

[0056] S21. Detect the air intake speed of the air intake system.

[0057] An anemometer can be used to detect the intake air velocity. A SMARTSENSOR Digital Anemometer AS856 split-type anemometer can be used. Specifically, the oven 40 can be opened, and the anemometer's measuring part can be positioned directly above the nozzles inside the oven 40 to measure the nozzle air velocity. Preferably, the air velocity of the airflow exiting from multiple nozzles near the center of the oven 40 can be measured; for example, the air velocity of the four nozzles near the center of the oven 40 can be measured. Inside the oven 40, the airflow is obstructed by the side walls, creating turbulence. The closer the airflow is to the side walls, the more turbulent it becomes. Therefore, to improve measurement accuracy, it is preferable to measure the air velocity of the four nozzles near the center of the oven 40. After measuring the air velocity of the four nozzles, the average value of the air velocity of the four nozzles is taken as the intake air velocity of the intake system.

[0058] S22. Compare the air intake speed of the air intake system with the preset value. If the air intake speed of the air intake system is different from the preset value, first check whether each pipe is damaged or blocked. After the check is completed, if each pipe is intact and there is no blockage, proceed to step S23.

[0059] S23. Adjust the rotational speed of the branch intake fan 22 by changing the frequency of its inverter, thereby increasing or decreasing the intake speed of the air intake system. And / or, adjust the rotational speed of the main intake fan 12 by changing the frequency of its inverter, thereby increasing or decreasing the intake speed of the air intake system. In step S1, the main intake damper 11 and the branch intake damper 21 have already been opened to their maximum values. Now, simply maintaining the opening degree of the main intake damper 11 and the branch intake damper 21 unchanged, and adjusting the rotational speed of the branch intake fan 22 and the main intake fan 12 will adjust the intake speed of the air intake system. There is no need to frequently adjust the main intake damper 11 and the branch intake damper 21, thus allowing for a simpler and more precise adjustment of the intake speed of the air intake system.

[0060] If the branch intake fan 22 and the main intake fan 12 have reached their maximum speeds, but the intake air velocity is still lower than the preset value, the cold air damper 31 can be opened to supplement air. Alternatively, the large circulation damper 71 can be opened to supplement air. After adjusting the intake air velocity of the intake system to the same as the preset value, step S3 is executed.

[0061] S3. Adjust the exhaust volume of the exhaust system to the preset value.

[0062] S31. Detect the air pressure inside the oven.

[0063] The internal air pressure of the oven 40 is obtained by detecting the air pressure inside the inlet and outlet of the oven and comparing the air pressure value with the preset air pressure range. Different oven structures or special processes require different air pressure ranges. Operators set a preset air pressure range based on experience. Normally, industry experience shows that the exhaust volume of the oven 40 should be greater than or equal to the nozzle inlet volume plus the solvent evaporation volume minus the circulating air volume. The exhaust volume of the oven 40 needs to be slightly greater than the nozzle inlet volume to achieve better drying results. However, if the exhaust volume is greater than the inlet volume, the air pressure inside the oven 40 will be in a negative pressure state. Operators can set a reasonable numerical range as the preset air pressure range based on their experience; for example, the preset air pressure range can be set to -5 to -10 Pa.

[0064] The tool used to measure the internal air pressure of the oven 40 can be a barometer, specifically the KXYL-600B high-precision digital anemometer / barometer from Fujian Longyan Kaixiang Instrument Co., Ltd. The measurement process includes: vertically inserting the detection part (Pitto tube) of the barometer into the oven 40 from the discharge port or inlet to a position 5-10 cm inside the oven 40, and detecting the air pressure inside the discharge port and inlet. The average of the air pressure values ​​inside the discharge port and inlet can be selected as the internal air pressure value of the oven 40. In other embodiments, two pressure sensors can be used to automatically acquire the air pressure value inside the oven, with the two pressure sensors respectively fixed inside the discharge port and inlet.

[0065] S32. Compare the air pressure inside the oven with the preset value.

[0066] After comparison, if the detected air pressure value is within the preset air pressure range, it means that the exhaust volume has reached the preset standard. At this time, the air inlet speed and exhaust speed of the oven 40 can be used as the standard values ​​in the subsequent production process.

[0067] After comparison, if the detected air pressure value is not within the preset air pressure range, step S4 is executed to adjust the air pressure value inside the oven 40.

[0068] S4. Keep the intake speed of the intake system constant, and adjust the exhaust speed of the exhaust system according to the characteristics of the air pressure value. Specifically, if the air pressure value is greater than the maximum value of the preset air pressure range, increase the exhaust speed of the exhaust system; if the air pressure value is less than the minimum value of the preset air pressure range, decrease the exhaust speed of the exhaust system, and then return to step S3 to compare the detected air pressure value with the preset air pressure range value.

[0069] In step S4, the speed of the branch exhaust fan 61 can be increased or decreased by changing the frequency of its inverter, and / or the speed of the main exhaust fan can be increased or decreased by changing the frequency of its inverter. Preferably, the speed of the main exhaust fan can be kept constant while the speed of the branch exhaust fan 61 is increased or decreased; when the speed of the branch exhaust fan 61 is adjusted to its maximum or minimum value, if the air pressure value inside the oven 40 is not within the preset air pressure range, then the speed of the branch exhaust fan 61 is kept constant while the speed of the main exhaust fan is increased or decreased. This embodiment uses this method to adjust the exhaust speed of the exhaust system.

[0070] If adjusting the exhaust speed of the exhaust system to its maximum or minimum value still fails to bring the air pressure inside the oven 40 within the preset air pressure range, then keep the exhaust speed of the exhaust system unchanged and increase or decrease the air intake speed of the air intake system. Then return to step S3 to continue detecting the air pressure inside the oven 40 and comparing the air pressure value with the preset air pressure range until the air pressure value is within the preset air pressure range.

[0071] In this embodiment, the air intake velocity of the air intake system and the internal air pressure of the oven 40 are used as the criteria for judging whether the air intake and exhaust volume of the oven 40 meet the standards. When the air intake velocity and air pressure of the air intake system reach the preset air pressure range, it indicates that the air intake and exhaust volume of the oven 40 meet the standards.

[0072] The process of adjusting the internal air pressure of the drying oven 40 includes: First, controlling the air intake speed of the air intake system within a preset value. Under this preset value, the air intake speed will not be too low, resulting in poor drying effect, nor too high, resulting in high energy consumption. After adjusting the air intake speed, keep the air intake speed constant and measure the internal air pressure of the drying oven 40. Use the internal air pressure of the drying oven 40 as the standard for judging whether the exhaust volume of the drying oven 40 meets the standard. If the air pressure is not within the preset air pressure range, keep the air intake speed constant and adjust only the exhaust speed until the air pressure is within the preset air pressure range. This can eliminate the interference of air intake speed, simplify the adjustment process, and improve adjustment efficiency and accuracy.

[0073] Under normal circumstances, once the air intake speed is adjusted to the preset value, further adjustments should be avoided, as reducing the air intake speed will affect the drying effect, while increasing the air intake speed will increase energy consumption. However, if the exhaust speed reaches its maximum or minimum value, but the air pressure inside the oven 40 is not yet within the preset air pressure range, the exhaust speed can be kept constant, and the air pressure inside the oven 40 can be adjusted appropriately by changing the air intake speed to bring it within the preset air pressure range. When the air intake speed of the air intake system and the air pressure inside the oven 40 are within the preset air pressure range, it indicates that the air intake and exhaust volumes of the oven 40 have met the standards. Therefore, the air intake speed, exhaust speed, temperature, and other parameters of the oven 40 under this state can be used as setting parameters for subsequent production. Of course, sample testing can be conducted before production. Specifically, the operating parameters of the coating machine are set according to the aforementioned air intake speed, exhaust speed, temperature, and other setting parameters. Then, sample production is carried out, and the quality of the sample is used to test whether the air intake and exhaust volumes of the oven 40 meet the actual production requirements.

[0074] In this embodiment, the air volume of the coating machine oven 40 can be adjusted and set without the need to install an air volume detection device on the pipe of the oven 40. This reduces the difficulty of adjusting and setting the air volume of the coating machine oven 40 and allows the air intake speed to be controlled within a reasonable range, thereby keeping the energy consumption at a low level.

[0075] In addition, in this embodiment, during the process of adjusting the air pressure inside the inlet and outlet of the oven 40, the air inlet speed is first set to a preset value and kept constant. In this way, only the exhaust speed needs to be adjusted afterward, without having to frequently adjust the air inlet speed. This can reduce the difficulty of adjusting the air pressure inside the inlet and outlet of the oven 40 to a certain extent.

[0076] Furthermore, in this embodiment, the preset value of the air intake velocity can be manually set to a suitable value based on industry experience to ensure that the energy consumption of the air intake system remains at a low level when the air intake velocity is at this value; then, the exhaust velocity is adjusted to bring the air pressure values ​​inside the oven's inlet and outlet within the preset range. In this way, the technical effect of reducing energy consumption can be achieved.

[0077] Example 2

[0078] Please see Figure 2 The difference between Embodiment 2 and Embodiment 1 is that the coating machine includes five sequentially arranged and connected ovens 40, which are defined from right to left as the first zone oven, the second zone oven, the third zone oven, the fourth zone oven, and the fifth zone oven. The number of branch air inlet pipes 20 is the same as the number of ovens 40, and each oven 40 is connected to the main air inlet pipe 10 through a branch air inlet pipe 20. The number of branch exhaust pipes 60 is the same as the number of ovens 40, and each oven 40 is connected to the main exhaust pipe through a branch exhaust pipe 60. The air pressure value inside each oven 40 is detected using the scheme of Embodiment 1, ensuring that the air pressure value is within the preset air pressure range of each oven 40. The preset air pressure range value of each oven 40 can be set to different values ​​according to actual needs. Otherwise, Embodiment 2 is the same as Embodiment 1.

[0079] Before adjusting the air pressure inside the inlet and outlet of each oven 40, close the corresponding circulating air dampers 71 of the first and second ovens to ensure that as much of the volatile solvent inside the first and second ovens is discharged through the exhaust system. Industry experience shows that the amount of volatile solvent inside the third, fourth, and fifth ovens gradually decreases. Based on this, the corresponding circulating air dampers 71 of the third, fourth, and fifth ovens can be opened, with the opening degree gradually increasing. Activating the circulating air improves the drying effect. Furthermore, the circulating air discharged through the ducts helps adjust the air pressure inside the corresponding ovens, thus appropriately reducing the air intake speed of the air intake system and achieving energy savings. Specifically, the opening degree of the circulating air damper 71 of the third zone oven, the fourth zone oven, and the fifth zone oven is 30%~50%, 50%~70%, and 70%~90%, respectively. In other embodiments, the opening degree of the circulating air damper 71 can be appropriately adjusted according to the different conditions of the coating machine oven.

[0080] Example 3

[0081] The difference between Example 3 and Example 2 is that: the air pressure inside the first and fifth zone ovens is measured, and the air intake and exhaust volumes of the second, third, and fourth zone ovens are adjusted to maintain the air pressure inside the first and fifth zone ovens at preset values, for example, between -5 Pa and +5 Pa. Otherwise, Example 3 is identical to Example 2.

[0082] Any combination of various embodiments of the present invention, provided it does not violate the inventive concept of the present invention, shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, any simple modifications to the technical solution and any combination of different embodiments that do not violate the inventive concept of the present invention shall be within the protection scope of the present invention.

Claims

1. A method of setting an air intake amount and an air exhaust amount of an oven of a coater, characterized by, The method comprises the following steps: S1, turning on the air inlet system of the oven and turning on the air outlet system of the oven; S2, adjusting the air inlet speed of the air inlet system to a preset value; S3, obtaining the air pressure value inside the oven through air pressure detection on the inside of the feeding port and discharging port of the oven, comparing the air pressure value with the preset air pressure range value; if the air pressure value is not within the preset air pressure range value, executing step S4; S4, keeping the air inlet speed of the air inlet system unchanged, adjusting the air outlet speed of the air outlet system up or down according to the numerical characteristics of the air pressure value, and returning to step S3; The air inlet system comprises a main air inlet pipe, a branch air inlet pipe, a main air inlet fan arranged on the main air inlet pipe, and a branch air inlet fan arranged on the branch air inlet pipe; the branch air inlet pipe is connected to the main air inlet pipe and the nozzle inside the oven; The main air inlet pipe is provided with a main air inlet damper; the branch air inlet pipe is provided with a branch air inlet damper; In step S1, the process of turning on the air inlet system comprises: turning on the main air inlet fan and the branch air inlet fan, and opening the main air inlet damper and the branch air inlet damper to the maximum value; In step S2, the process of adjusting the air inlet speed of the air inlet system to a preset value comprises: S21: detecting the air inlet speed of the air inlet system and the air speed of the nozzle using an air speed meter; S22: comparing the air inlet speed of the air inlet system with the preset value; if the air inlet speed of the air inlet system is different from the preset value, executing step S23; if the air inlet speed of the air inlet system is the same as the preset value, executing step S3; S23: adjusting the rotating speed of the branch air inlet fan by changing the frequency of the frequency converter of the branch air inlet fan, and adjusting the air inlet speed of the air inlet system, and / or adjusting the rotating speed of the main air inlet fan by changing the frequency of the frequency converter of the main air inlet fan, so as to increase or decrease the air inlet speed of the air inlet system.

2. The method of setting the air supply and exhaust volumes of a coater oven according to claim 1, wherein In step S4, when the air outlet speed of the air outlet system reaches the maximum value or the minimum value, the air outlet speed of the air outlet system is kept unchanged, the air inlet speed of the air inlet system is adjusted up or down, and the process returns to step S3.

3. The method of setting the air supply and exhaust volumes of a coater oven according to claim 1, wherein The air outlet system comprises a branch air outlet pipe and a branch air outlet fan arranged on the branch air outlet pipe; the branch air outlet pipe is connected to the inside of the oven; In step S4, the rotating speed of the branch air outlet fan is adjusted up or down by changing the frequency of the frequency converter of the branch air outlet fan, so as to adjust the air outlet speed of the air outlet system.

4. The method of setting the air supply and exhaust volumes of a coater oven according to claim 3, wherein The air outlet system further comprises a main air outlet pipe and a main air outlet fan arranged on the main air outlet pipe; the main air outlet pipe is connected to the branch air outlet pipe; In step S4, when the rotating speed of the branch air outlet fan reaches the maximum or the minimum, the rotating speed of the main air outlet fan is adjusted up or down by changing the frequency of the frequency converter of the main air outlet fan, so as to adjust the air outlet speed of the air outlet system.

5. The method of setting the air supply and exhaust volumes of a coater oven according to claim 1, wherein The air outlet system comprises a main air outlet pipe, a branch air outlet pipe, a main air outlet fan arranged on the main air outlet pipe, and a branch air outlet fan arranged on the branch air outlet pipe; the branch air outlet pipe is connected to the main air outlet pipe and the inside of the oven; The branch exhaust pipe is provided with a branch exhaust air damper, and the main exhaust pipe is provided with a main air damper; In step S1, the process of starting the exhaust system includes: starting the main exhaust fan and the branch exhaust fan, and opening the branch exhaust air damper and the main air damper to the maximum.

6. The method of setting the air supply and exhaust volumes of a coater oven according to claim 1, wherein The air inlet system further comprises a cold air pipe and a cold air damper arranged on the cold air pipe; the cold air pipe is communicated with the branch air inlet pipe, and the position where the branch air inlet pipe is communicated with the cold air pipe is located between the branch air inlet fan and the main air inlet pipe; In step S1, the process of starting the air inlet system further includes: closing the cold air damper.

7. The method of setting the air supply and exhaust volumes of a coater oven according to claim 6, wherein In step S23, the cold air damper is opened, so as to increase the air inlet speed of the air inlet system.

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