Baking control method based on temperature zone segmentation and coating apparatus

Abstract

The application relates to the technical field of battery pole piece manufacturing, and provides a baking control method based on temperature zone segmentation and a coating device. The method comprises the following steps: controlling a conveying device to operate, so that a sheet material continuously passes through a high-temperature zone, a constant-temperature zone and a low-temperature zone in sequence; obtaining surface state information of the sheet material located in each temperature zone respectively; and according to the surface state information of the sheet material in each temperature zone, the baking temperature of the corresponding temperature zone is adjusted in real time respectively. The coating device comprises an oven body, a conveying device, a state detection device and a controller, and the oven body is sequentially provided with the high-temperature zone, the constant-temperature zone and the low-temperature zone along the sheet material conveying direction. According to the application, the surface state information of the sheet material in each temperature zone is obtained, and the baking temperature of the corresponding temperature zone is adjusted in real time according to the surface state information, which helps the baking temperature of each temperature zone to dynamically change along with the actual state change of the sheet material in the drying process, so that the uniformity of sheet material baking and the product quality are improved.

Description

Technical Field

[0001] This invention relates to the field of battery manufacturing technology, and in particular to a baking control method and coating equipment based on temperature-division segmentation. Background Technology

[0002] In the production process of lithium battery electrodes, the coated electrodes need to be dried using coating equipment to remove the solvent from the slurry. The drying of the electrode coating is a typical multi-stage physical process, usually including a preheating stage, a constant-rate drying stage, and a cooling stage. The requirements for baking temperature, residence time, and transport conditions vary significantly between different drying stages. To achieve process control for different drying stages such as preheating, constant-rate drying, and cooling, different temperature zones are typically set along the electrode transport direction.

[0003] However, in existing coating equipment, the baking parameters for the electrode sheets are not dynamically adjusted according to the actual state of the electrode sheets at different drying stages, which easily leads to insufficient baking or over-baking, affecting the product quality of the electrode sheets. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a baking control method and coating equipment based on temperature segmentation.

[0005] In a first aspect, the baking control method based on temperature segmentation according to an embodiment of the present invention includes the following steps: Control the operation of the conveying device so that the sheet material is conveyed in the direction of continuous passage through the high temperature zone, constant temperature zone and low temperature zone in sequence; Obtain surface state information of the sheet material located in the high temperature zone, the constant temperature zone, and the low temperature zone, respectively; Based on the surface condition information of the sheet material in each temperature zone, the baking temperature of the corresponding temperature zone is adjusted in real time.

[0006] According to the baking control method based on temperature segmentation according to the present invention, the surface state information includes sheet surface temperature information, sheet surface coating moisture content information and / or sheet surface coating curing state information.

[0007] According to the temperature-segmented baking control method of the present invention, the moisture content information of the coating on the sheet material surface includes a first moisture content range corresponding to the high temperature zone, a second moisture content range corresponding to the constant temperature zone, and a third moisture content range corresponding to the low temperature zone, wherein the first moisture content range, the second moisture content range, and the third moisture content range decrease sequentially.

[0008] According to an embodiment of the present invention, a temperature-segmented baking control method acquires surface state information of sheet material located in the high-temperature zone, the constant-temperature zone, and the low-temperature zone, respectively, including: Obtain the first state information of the sheet surface before entering the high-temperature zone; Obtain the second state information of the sheet surface within the high-temperature zone; Obtain the third state information of the sheet surface when it is about to leave the high-temperature zone and enter the constant-temperature zone; Obtain the fourth state information of the sheet surface within the constant temperature zone; Obtain the fifth state information of the sheet surface when it is about to leave the constant temperature zone and enter the low temperature zone; Obtain the sixth state information of the sheet surface within the low-temperature zone; Obtain the seventh state information of the sheet surface when it is ready to leave the low-temperature zone.

[0009] According to the baking control method based on temperature zone segmentation according to an embodiment of the present invention, when the sheet material passes through each temperature zone under the support of the conveying device, it passes through the negative pressure area in each temperature zone, and the negative pressure area is formed by the operation of the negative pressure module set in the corresponding temperature zone. This includes the following when the sheet material passes through the negative pressure areas within each temperature zone: Obtain the real-time negative pressure value and / or real-time air volume of the negative pressure module during operation in each temperature zone; Based on the comparison between the real-time negative pressure value and the preset negative pressure target value, the air supply volume of the corresponding temperature zone is adjusted to maintain the actual negative pressure value in the temperature zone within the allowable fluctuation range of the preset negative pressure target value. And / or, Based on the comparison between the real-time exhaust volume and the preset exhaust volume target value, and the current baking temperature of the temperature zone, the hot air supply and / or heating power of the corresponding temperature zone are adjusted to compensate for the heat carried away by the suction.

[0010] According to the baking control method based on temperature segmentation according to an embodiment of the present invention, the replenishment air volume comes from external fresh air and / or the first return gas drawn by the negative pressure module; The first reflux gas is refluxed in at least one of the following ways: Each temperature zone is equipped with an independent return air duct. The air inlet of each return air duct is connected to the negative pressure module of the corresponding temperature zone, and the air outlet is connected to the interior of the same temperature zone, so that the gas drawn from each temperature zone flows back to the corresponding original temperature zone. The negative pressure modules of each temperature zone are collected into the collection air box through the return air duct. The collection air box is connected to the interior of each temperature zone through branch pipes, so that the gas drawn into each temperature zone is collected by the collection air box and then distributed to the corresponding temperature zone.

[0011] According to the baking control method based on temperature zone segmentation of the present invention, each temperature zone is baked with hot air drying. The hot air drying method is configured such that each temperature zone is provided with hot air nozzles and return air nozzles, the hot air nozzles and the return air nozzles are alternately arranged along the passage path of the sheet, and the hot air nozzles blow hot air onto the surface of the sheet. The return air nozzle is used to collect the hot air blown out by the hot air nozzle after passing through the surface of the sheet material and form hot air return air. The collected hot air return air is sent to the collection air box or directly returned to the corresponding temperature zone as a second return gas to replenish the gas and / or heat in each temperature zone. And / or, The hot air nozzle is equipped with a return air structure, which is used to collect part of the return air formed after the hot air blown out by the hot air nozzle passes through the surface of the sheet, and send the collected return air as a third return gas to the collection air box or directly back to the corresponding temperature zone to replenish the gas and / or heat in each temperature zone.

[0012] According to the baking control method based on temperature segmentation according to an embodiment of the present invention, the conveying device is configured in at least one of the following ways: The conveying device is equipped with a conveying section, which is a continuous conveying structure and runs through all temperature zones along the sheet material conveying direction, so that the sheet material can be continuously and uninterruptedly transferred between adjacent temperature zones. The conveying device is provided with at least three conveying sections, and each temperature zone is provided with an independent conveying section. Each conveying section is controlled by its corresponding drive end so that the conveying speed of the sheet material in each temperature zone can be adjusted independently.

[0013] According to the baking control method based on temperature zones according to an embodiment of the present invention, when the conveying unit is a continuous conveying structure, the conveying device operates at a single conveying speed and independently adjusts the baking temperature of each temperature zone according to the preset baking temperature target value corresponding to each temperature zone. When the conveying device is provided with at least three conveying sections, and each temperature zone is provided with an independent conveying section, the preset conveying speed target value and / or preset baking temperature target value corresponding to each temperature zone are obtained, and the conveying speed and / or baking temperature of the corresponding temperature zone are adjusted according to the preset conveying speed target value and / or preset baking temperature target value corresponding to each temperature zone.

[0014] The temperature-zone-based segmented baking control method according to embodiments of the present invention has at least the following beneficial effects: By acquiring the surface state information of the sheet material in each temperature zone and adjusting the baking temperature of the corresponding temperature zone in real time, the baking temperature of each temperature zone can dynamically change with the actual state changes of the sheet material during the drying process, which helps to avoid insufficient baking or over-baking problems caused by using a fixed baking temperature. Simultaneously, since the transfer of the sheet material between each temperature zone is continuous, it helps to avoid the risk of sheet material position shift and scratch damage at the joints of the segmented conveyor belts, thereby helping to improve the uniformity of sheet material baking and product quality.

[0015] Secondly, according to an embodiment of the present invention, a coating apparatus is used to perform the above-described temperature-segmented baking control method, comprising: The drying oven module is sequentially equipped with a high-temperature zone, a constant-temperature zone, and a low-temperature zone along the sheet material conveying direction; A conveying device has a conveying section, which carries the sheet material and drives the sheet material to travel along the sheet material conveying direction in the high temperature zone, the constant temperature zone and the low temperature zone; A drying device is respectively installed in the high temperature zone, the constant temperature zone and the low temperature zone, and the drying device is used to provide drying heat to the sheet material in the corresponding temperature zone; A state detection device is respectively installed in the high temperature zone, the constant temperature zone and the low temperature zone to acquire surface state information of the sheet material in the corresponding temperature zone; A coating device is installed at the feed end of the oven module. The coating device is used to coat the slurry onto the surface of the sheet material. The coated sheet material enters the oven module for drying. The controller is connected to the status detection device and the hot air supply device of each temperature zone, respectively, and is used to adjust the baking temperature of the corresponding temperature zone in real time according to the surface status information of the sheet material in each temperature zone.

[0016] The coating apparatus according to embodiments of the present invention has at least the following beneficial effects: By providing controllers that are respectively connected to the state detection device and the drying device in each temperature zone, the coating apparatus can independently adjust the baking temperature of each temperature zone according to the actual surface state information of the sheet material in each temperature zone, which helps to achieve independent control and dynamic adjustment of the baking temperature of each temperature zone. Simultaneously, the conveying section of the conveying device allows the sheet material to continuously travel between the temperature zones, which helps to avoid thermal shock damage to the sheet material caused by temperature abrupt changes at the temperature zone boundaries, thereby helping to improve the uniformity of sheet material baking and product quality.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a main step logic block diagram of the temperature-segmented baking control method according to an embodiment of the present invention; Figure 2 This is a step logic block diagram of the negative pressure compensation control of the baking control method based on temperature segmentation according to an embodiment of the present invention; Figure 3 This is a step logic block diagram of the heat compensation control of the baking control method based on temperature segmentation according to an embodiment of the present invention; Figure 4 This is a partial structural diagram of the coating equipment according to an embodiment of the present invention; Figure 5 This is a partial structural diagram of the baking module according to an embodiment of the present invention; Figure 6 This is a partial structural diagram of the conveying device according to an embodiment of the present invention; Figure 7 This is a partial structural schematic diagram of the coating equipment according to an embodiment of the present invention; Explanation of reference numerals in the attached figures: High temperature zone 1; Constant temperature zone 2; Low temperature zone 3; Oven module 100; upper chamber 110; return air chamber 111; return air outlet 1111; return air conveying duct 1112; return air pipeline 1113; lower chamber 120; air inlet 121; Hot air nozzle 130; Return air nozzle 140; Conveying device 200; drive end 210; Negative pressure module 300. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of the invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. If the terms "first" and "second" are used, they are only for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] Reference Figures 4 to 7 This application provides a coating apparatus, which is mainly used for the baking and drying process of lithium battery electrodes. Additionally, see reference... Figures 1 to 3 This application also provides a temperature-segmented baking control method for use in the aforementioned coating equipment.

[0024] Specifically, the coating equipment includes an oven body, a conveying device 200, a drying device, a status detection device, and a controller.

[0025] Reference Figure 7 The oven body is sequentially configured with a high-temperature zone 1, a constant-temperature zone 2, and a low-temperature zone 3 along the sheet conveying direction. Specifically, refer to... Figure 4 The oven body consists of three oven modules 100 connected in series, forming a high-temperature zone 1, a constant-temperature zone 2, and a low-temperature zone 3, respectively.

[0026] In some embodiments, the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3 are formed by sequentially connecting independent oven modules 100 along the sheet material conveying direction. Each oven module 100 is equipped with an independent heating device and a temperature detection device, allowing the baking temperature of each module to be independently set and controlled. After the oven modules 100 are connected in series, the baking channels of adjacent modules are interconnected. When the sheet material enters the next module from the previous module, the ambient temperature gradually transitions from the previous temperature zone to the next temperature zone, rather than undergoing a step-like abrupt change. This helps to mitigate the thermal shock experienced by the coating on the sheet material surface at the temperature zone boundary.

[0027] In some embodiments, the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3 can also be formed by dividing the same oven body sequentially along the sheet conveying direction, and the temperature zoning of each temperature zone can be achieved by setting a heat insulation structure inside the oven body.

[0028] Each oven module 100 includes an upper chamber 110 and a lower chamber 120. The upper chamber 110 is positioned above the lower chamber 120, and together they enclose a baking channel through which the sheet material passes. The baking channel extends along the sheet material conveying direction, and its internal space is used to accommodate the sheet material and hot air. The conveying device 200 is a continuous conveying structure that passes through all oven modules 100 sequentially along its own length, carrying the sheet material and conveying it sequentially into the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3. The conveying device 200 extends continuously and uninterruptedly at the joints of adjacent oven modules 100, without any breaks or connections. This allows the sheet material to enter from the input end of the first oven module 100, be carried by the conveying device 200, pass through each temperature zone sequentially, and exit from the output end of the last oven module 100, helping to avoid sheet material position shifting and scratch damage caused by connections.

[0029] The conveying device 200 has two drive ends 210, which are respectively located at the input end of the first oven module 100 and the output end of the last oven module 100. Each drive end 210 is equipped with a drive roller and a drive motor, and the drive motor is connected to the drive roller for transmission. The control module is connected to the two drive ends 210 and is used to control the synchronous operation of the drive motors of the two drive ends 210. By setting drive rollers at both ends simultaneously and controlling their synchronous operation by the control module, traction force is applied simultaneously from both ends of the conveying device 200, making the tension distribution of the entire conveying device 200 more uniform, which helps to ensure stable and reliable transmission of the sheet material throughout the process of sequentially passing through the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3.

[0030] The upper housing 110 contains a return air chamber 111 and a hot air chamber 112, which are arranged perpendicular to the sheet material. Specifically, the hot air chamber 112 is located below the return air chamber 111 and closer to the baking channel, i.e., the hot air chamber 112 is positioned between the return air chamber 111 and the baking channel. The hot air chamber 112 communicates with the baking channel and is used to deliver dry hot air into the baking channel. The baking channel is connected to the return air chamber 111 via a return air duct 1113, which passes through the hot air chamber 112 and connects to the return air chamber 111. The temperature of the hot air in the hot air chamber 112 is higher than the temperature of the return air in the return air duct 1113. Heat is transferred from the hot air side to the return air side through the duct wall, which helps to preheat the return air and reduces the risk of solvent vapor condensation on the inner wall of the duct and the return air chamber 111. Meanwhile, the hot air chamber 112 and the return air chamber 111 are arranged in layers along the vertical direction, which helps to make efficient use of the internal space of the upper housing 110.

[0031] The return air chamber 111 has a return air outlet 1111 and a return air inlet. The return air outlet 1111 is located on the side wall or top of the upper housing 110 and is used to discharge the return air in the return air chamber 111 to an external circulation pipeline or exhaust gas treatment system. The return air inlet is located at the bottom of the upper housing 110, i.e., on the side facing the baking channel. The return air inlet is connected to the baking channel and is used to guide the return air in the baking channel into the return air chamber 111. A return air conveying duct 1112 is formed inside the return air chamber 111, and the return air conveying duct 1112 extends to both sides of the return air outlet 1111. The return air outlet 1111 is located in the middle area of ​​the return air chamber 111, and the return air conveying duct 1112 extends symmetrically from the return air outlet 1111 to both ends, and the flow cross-sectional area of ​​the return air conveying duct 1112 gradually increases symmetrically from the return air outlet 1111 to both ends. After being drawn into the return air conveying duct 1112 from both ends, the return air flows along the left and right sides towards the return air outlet 1111 in the middle. The flow cross-sectional area of ​​the return air conveying duct 1112 gradually increases from the return air outlet 1111 in the opposite direction of the return air flow, that is, it gradually decreases from both ends towards the middle. The larger cross-sectional area at the far end helps to reduce the suction resistance to compensate for the pressure loss along the way, so that the suction velocity at the return air inlet at each part of the duct tends to be consistent, which helps to improve the uniformity of return air collection in the width direction of the sheet material.

[0032] The oven module 100 is also equipped with multiple hot air nozzles 130 and multiple return air nozzles 140. The hot air nozzles 130 and return air nozzles 140 are arranged alternately along the sheet material conveying direction. Both the hot air nozzles 130 and return air nozzles 140 are located inside the upper housing 110 and above the baking channel. The air inlet of the hot air nozzle 130 is connected to the hot air chamber 112, guiding the hot air from the hot air chamber 112 into the baking channel to blow onto the sheet material surface. The air inlet of the return air nozzle 140 is connected to the baking channel, drawing in the return air formed after the hot air nozzles 130 blown onto the sheet material surface. The alternating arrangement of the hot air nozzles 130 and return air nozzles 140 ensures that the return air is promptly drawn in along the diffusion path, helping to prevent disorderly diffusion of the return air within the baking channel. Simultaneously, since the return air contains high heat, timely recovery helps reduce heat energy waste.

[0033] After the return air nozzle 140 collects the return air, it needs to be processed. In one optional embodiment, the outlet end of the return air nozzle 140 is connected to the hot air chamber 112. The return air collected by the return air nozzle 140 flows directly back to the hot air chamber 112 through the outlet end. After mixing with the fresh air introduced from the outside in the hot air chamber 112, it is blown back onto the surface of the sheet material through the hot air nozzle 130. This helps to recycle the waste heat in the return air and reduce the energy consumption required to heat the external fresh air. In another optional embodiment, the outlet end of the return air nozzle 140 is connected to the baking channel. The return air collected by the return air nozzle 140 flows directly back into the baking channel through the outlet end. This helps to form an internal airflow circulation in the baking channel, maintain the stability of the flow field in the baking channel, and avoid the pressure drop in the baking channel due to the extraction of a large amount of return air. In another optional embodiment, the outlet end of the return air nozzle 140 is connected to the external environment. The return air collected by the return air nozzle 140 is directly discharged to the outside of the coating equipment through the outlet end. This is suitable for situations where the concentration of volatile gases in the return air is high, and helps to avoid the continuous circulation and accumulation of high-concentration volatile gases inside the coating equipment, which could affect drying efficiency or pose safety risks. The above three return air treatment methods can be used individually or in any combination.

[0034] Each oven module 100 is equipped with a negative pressure module 300. The negative pressure module 300 is used to create a negative pressure area below the bearing surface of the conveying device 200. The negative pressure module 300 includes a negative pressure chamber and a negative pressure source. The negative pressure chamber is located below the bearing surface of the conveying device 200, and the negative pressure source is connected to the negative pressure chamber through a pipeline. When the negative pressure source is activated, a negative pressure environment lower than the external atmospheric pressure is formed in the negative pressure chamber. This negative pressure acts on the area above the bearing surface through through holes or gaps on the bearing surface, forming a negative pressure area below the bearing surface. When the conveying device 200 carries the sheet material above the negative pressure area, because the air pressure below the bearing surface is lower than the air pressure above the bearing surface, the sheet material is pressed towards the bearing surface by atmospheric pressure, thereby being adsorbed and adhered to the bearing surface. This helps prevent the sheet material from drifting or wrinkling during hot air blowing, ensuring the stability of the sheet material's transmission in each temperature zone. Since each oven module 100 is equipped with a negative pressure module 300, the sheet material can be adsorbed and fixed when passing through the negative pressure area of ​​any module during the entire process of passing through the high temperature zone 1, the constant temperature zone 2 and the low temperature zone 3.

[0035] An air inlet 121 is provided on the wall near the bottom of the lower chamber 120, and this air inlet 121 is connected to the exhaust end of the negative pressure module 300. Gas extracted from the baking channel by the negative pressure module 300 flows back to the space at the bottom of the lower chamber 120 via the air inlet 121. Since the air inlet 121 is located below the negative pressure area, the returning gas flows upwards towards the sheet material, which helps compensate for the local pressure drop caused by the continuous extraction by the negative pressure module 300, preventing the pressure below the bearing surface from deviating too much from the set value, thus helping to maintain the pressure stability of the negative pressure area. Simultaneously, the returning gas has absorbed heat in the baking channel and has a high temperature; as it flows upwards, it can assist in heating the lower surface of the sheet material, helping to reduce the temperature difference between the upper and lower surfaces of the sheet material, thereby improving the uniformity of drying in the thickness direction of the sheet material.

[0036] Reference Figure 1 The temperature-segmented baking control method provided in this application includes the following steps: Control the operation of the conveying device 200 so that the sheet material passes through the high temperature zone 1, the constant temperature zone 2 and the low temperature zone 3 in sequence along the conveying direction; Obtain surface state information of the sheet material located in high temperature zone 1, constant temperature zone 2 and low temperature zone 3 respectively; Based on the surface condition information of the sheet material in each temperature zone, the baking temperature of the corresponding temperature zone is adjusted in real time.

[0037] In some embodiments, the conveying device 200 has a conveying section for carrying the sheet material and driving it to travel along the sheet material conveying direction through the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3. This conveying section is a continuous conveying structure and runs through all temperature zones along the sheet material conveying direction, ensuring continuous sheet material transmission between each temperature zone. There is no overlap between conveyor belts at the boundaries of adjacent temperature zones, which helps avoid sheet material position shifting and scratch damage caused by jointing.

[0038] The controller is signal-connected to the drive end 210 of the conveyor 200. By sending control commands to the drive end 210, the controller can start, stop, or adjust the operating speed of the conveyor 200, thereby causing the sheet material to pass through each temperature zone sequentially according to a preset rhythm. In this embodiment, since each temperature zone shares the same conveyor belt, the transmission speed remains consistent across each temperature zone, and the baking temperature of each temperature zone is an independently adjustable control variable.

[0039] Based on the surface condition information of the sheet material in each temperature zone fed back by the status detection device, the controller independently adjusts the actual baking temperature of each temperature zone so that the actual baking temperature of each temperature zone approaches its corresponding preset baking temperature target value.

[0040] In some embodiments, the conveying device 200 has at least three conveying sections, and each temperature zone is provided with an independent conveying section. Each conveying section is controlled by its corresponding drive end 210, so that the conveying speed of the sheet material in each temperature zone can be adjusted independently.

[0041] The controller is connected to each drive terminal 210 by signal. By sending independent speed control commands to each drive terminal 210, the transmission section of each temperature zone runs according to its corresponding transmission speed target value.

[0042] In this embodiment, the transmission speed of each temperature zone can be set individually according to the process requirements corresponding to that temperature zone. For example, a higher transmission speed can be used in high temperature zone 1 to reduce the dwell time of the sheet in that zone, while a lower transmission speed can be used in low temperature zone 3 to extend the dwell time of the sheet in that zone, thereby meeting the different requirements of different temperature zones for drying dwell time.

[0043] The controller acquires the preset transmission speed target value and / or preset baking temperature target value for each temperature zone, and adjusts the transmission speed and / or baking temperature of the corresponding temperature zone according to the preset transmission speed target value and / or preset baking temperature target value for each temperature zone.

[0044] The transfer speed and baking temperature of each temperature zone can be independently adjusted control variables. For example, a higher transfer speed and a higher baking temperature can be used in high-temperature zone 1 to allow the sheet material to quickly pass through high-temperature zone 1 and complete the preheating; a moderate transfer speed and a constant baking temperature can be used in constant-temperature zone 2 to allow the sheet material to obtain sufficient constant-rate drying time in constant-temperature zone 2; and a lower transfer speed and a lower baking temperature can be used in low-temperature zone 3 to allow the sheet material to cool down sufficiently in low-temperature zone 3 and control the final solvent residue.

[0045] Based on the surface condition information of the sheet material in each temperature zone fed back by the condition detection device, the controller independently adjusts the conveyor speed and / or baking temperature of each temperature zone to make the actual operating parameters of each temperature zone approach the corresponding preset target value. Speed ​​control and temperature control of each temperature zone can be performed in tandem. For example, when the moisture content detected in a certain temperature zone is higher than expected, the controller can simultaneously reduce the conveyor speed of that zone to extend the drying time and increase the baking temperature of that zone to accelerate the drying rate, thus achieving a faster adjustment response.

[0046] In some embodiments, the coating equipment is equipped with corresponding state detection devices. These state detection devices are respectively located in high-temperature zone 1, constant-temperature zone 2, and low-temperature zone 3, and are used to acquire surface state information of the sheet material within the corresponding temperature zone. The state detection devices are signal-connected to the controller and transmit the detected surface state information to the controller in real time. The surface state information includes sheet material surface temperature information, sheet material surface coating moisture content information, and / or sheet material surface coating curing state information.

[0047] When the surface condition information is the surface temperature information of the sheet material, the condition detection device can use a non-contact infrared temperature sensor. This sensor is set above or to the side of the sheet material in each temperature zone and measures the surface temperature of the sheet material by receiving infrared radiation radiated from the surface of the sheet material.

[0048] When the surface condition information is the moisture content information of the coating on the sheet surface, the condition detection device can use a near-infrared moisture detector. This detector emits near-infrared light to the sheet surface and receives the reflected light. The moisture content of the coating on the sheet surface is calculated based on the absorption intensity of a specific wavelength in the reflection spectrum.

[0049] When the surface condition information is the curing condition information of the coating on the sheet material surface, the condition detection device can use a vision detection device to acquire images of the sheet material surface through an industrial camera, and analyze the images to determine the appearance characteristics of the coating, thereby assessing the degree of curing of the coating.

[0050] The controller adjusts the baking temperature of each zone in real time based on one or more of the surface condition information mentioned above. In practical applications, one or more combinations of the surface condition information can be selected according to specific process requirements.

[0051] In some embodiments, obtaining surface state information of the sheet material located in the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3 respectively includes: Obtain the first state information of the sheet surface before entering high-temperature zone 1; Obtain the second state information of the sheet surface within high-temperature zone 1; Obtain the third state information of the sheet surface when it is about to leave the high temperature zone 1 and enter the constant temperature zone 2; obtain the fourth state information of the sheet surface within the constant temperature zone 2; Obtain the fifth state information of the sheet surface when it is about to leave the constant temperature zone 2 and enter the low temperature zone 3; obtain the sixth state information of the sheet surface within the low temperature zone 3; Obtain the seventh state information of the sheet surface when it is ready to leave the low temperature zone 3.

[0052] In this embodiment, to achieve the above-mentioned data collection, the status detection device can be arranged along the sheet material conveying direction at the interior of each temperature zone and at the junction of adjacent temperature zones. Specifically, it includes: a first detection point set in front of the entrance of the high temperature zone 1, a second detection point set inside the high temperature zone 1, a third detection point set at the junction of the high temperature zone 1 and the constant temperature zone 2, a fourth detection point set inside the constant temperature zone 2, a fifth detection point set at the junction of the constant temperature zone 2 and the low temperature zone 3, a sixth detection point set inside the low temperature zone 3, and a seventh detection point set at the exit of the low temperature zone 3.

[0053] The aforementioned data collection points form a complete surface condition monitoring chain along the entire process. The data collection point before entering high-temperature zone 1 is used to acquire the initial surface condition of the sheet material before baking, serving as the input reference for temperature control adjustment in high-temperature zone 1. The data collection points within high-temperature zone 1 are used to acquire the surface condition during the preheating stage, providing feedback for temperature adjustment in high-temperature zone 1. The data collection point at the boundary between high-temperature zone 1 and constant-temperature zone 2 is used to acquire the state at the end of drying in high-temperature zone 1, determining whether the conditions for entering constant-temperature zone 2 are met. The data collection points within constant-temperature zone 2 are used to acquire the surface condition during the constant-rate drying stage, providing feedback for temperature adjustment in constant-temperature zone 2. The data collection point at the boundary between constant-temperature zone 2 and low-temperature zone 3 is used to acquire the state at the end of drying in constant-temperature zone 2, determining whether the conditions for entering low-temperature zone 3 are met. The data collection points within low-temperature zone 3 are used to acquire the surface condition during the deceleration drying stage, providing feedback for temperature adjustment in low-temperature zone 3. The data collection point at the exit of low-temperature zone 3 is used to acquire the final drying state, used for product quality determination. Based on the surface condition information fed back from each of the above data collection points, the controller adjusts the baking temperatures of high-temperature zone 1, constant-temperature zone 2, and low-temperature zone 3 in real time.

[0054] In some embodiments, the coating equipment is equipped with corresponding drying devices and controllers. The drying devices are respectively located in high-temperature zone 1, constant-temperature zone 2, and low-temperature zone 3, and are used to provide drying heat to the sheet material in the corresponding temperature zone. The controller is connected to the status detection device and the drying device in each temperature zone via signal connections.

[0055] Specifically, the controller sends a temperature control command to the drying device in high-temperature zone 1 based on the surface state information received from the state detection device in high-temperature zone 1; sends a temperature control command to the drying device in constant-temperature zone 2 based on the surface state information received from the state detection device in constant-temperature zone 2; and sends a temperature control command to the drying device in low-temperature zone 3 based on the surface state information received from the state detection device in low-temperature zone 3.

[0056] After receiving the temperature control command, the drying equipment in each temperature zone increases or decreases the drying heat supplied to that temperature zone accordingly, so that the baking temperature of each temperature zone is adjusted in real time according to the actual surface condition of the sheet in that temperature zone.

[0057] Optionally, the drying device is an infrared heater that transfers heat to the sheet material through infrared radiation, and the controller adjusts the baking temperature by regulating the output power of the infrared heater. Alternatively, each temperature zone uses hot air drying to bake the sheet material, and the controller adjusts the baking temperature by regulating the supply temperature and / or airflow of the hot air.

[0058] In some embodiments, the moisture content information of the sheet surface coating includes a first moisture content range corresponding to the high-temperature zone 1, a second moisture content range corresponding to the constant-temperature zone 2, and a third moisture content range corresponding to the low-temperature zone 3. The first, second, and third moisture content ranges decrease sequentially. As the sheet moves along the conveying direction from the high-temperature zone 1 to the low-temperature zone 3, the moisture content of its surface coating gradually decreases. The controller adjusts the baking temperature of the corresponding temperature zone in real time based on the comparison between the actual moisture content detected in each temperature zone and the preset moisture content range of the corresponding temperature zone. When the actual moisture content of the sheet surface coating in the high-temperature zone 1 is higher than the upper limit of the first moisture content range, the controller sends a heating command to the drying device in the high-temperature zone 1 to increase the baking temperature of the high-temperature zone 1 to accelerate solvent evaporation; when the actual moisture content is lower than the lower limit of the first moisture content range, the controller sends a cooling command to the drying device in the high-temperature zone 1 to decrease the baking temperature of the high-temperature zone 1 to avoid over-drying.

[0059] Similarly, the controller dynamically adjusts the baking temperatures of constant temperature zone 2 and low temperature zone 3 according to their respective moisture content ranges. By setting the moisture content control targets for each temperature zone to successively decreasing ranges, the coating on the sheet surface undergoes three stages: rapid evaporation, uniform drying, and deep drying in high temperature zone 1, constant temperature zone 2, and low temperature zone 3, respectively, which helps to achieve a smooth transition between the drying stages.

[0060] During the process of the sheet material traveling through each oven module 100, the sheet material passes through the negative pressure area within each temperature zone under the support of the conveying device 200. For this condition where the sheet material passes through the negative pressure area, the control method of this application also includes a compensation control step.

[0061] Specifically, the coating equipment is equipped with a negative pressure module 300 corresponding to each temperature zone. The negative pressure zone is formed by the operation of the negative pressure module 300 located within the corresponding temperature zone. Each oven module 100 is equipped with a negative pressure module 300, which is used to form a negative pressure zone below the bearing surface of the conveying device 200. The negative pressure module 300 includes a negative pressure chamber and a negative pressure source. The negative pressure chamber is located below the bearing surface of the conveying device 200, and the negative pressure source is connected to the negative pressure chamber via a pipeline. When the negative pressure source is activated, a negative pressure environment lower than the external atmospheric pressure is formed within the negative pressure chamber. This negative pressure acts on the area above the bearing surface through through holes or gaps on the bearing surface, forming a negative pressure zone below the bearing surface. When the conveying device 200 carrying the sheet material passes above the negative pressure zone, because the air pressure below the bearing surface is lower than the air pressure above the bearing surface, the sheet material is pressed towards the bearing surface by atmospheric pressure, thereby being adsorbed and adhered to the bearing surface. This adsorption helps prevent the sheet material from drifting or wrinkling during hot air blowing, ensuring the stability of the sheet material's transmission within each temperature zone. Since each oven module 100 is equipped with a negative pressure module 300, the sheet material can be adsorbed and fixed when passing through the negative pressure area of ​​any module during its entire journey through the high-temperature zone 1, the constant-temperature zone 2, and the low-temperature zone 3.

[0062] When the sheet material passes through the negative pressure area in each temperature zone, the negative pressure module 300 continues to operate and draws gas from the baking channel. This process will simultaneously take away some of the gas and heat in the baking channel, causing the actual negative pressure value and actual temperature in the temperature zone to deviate from the preset value.

[0063] Therefore, referring to Figure 2 and Figure 3 In addition to the above steps, the control method of this application also includes the following compensation control steps: Obtain the real-time negative pressure value and / or real-time air volume of the negative pressure module 300 in each temperature zone during operation; Based on the comparison between the real-time negative pressure value and the preset negative pressure target value, the air supply volume of the corresponding temperature zone is adjusted to maintain the actual negative pressure value in that temperature zone within the allowable fluctuation range of the preset negative pressure target value. And / or, based on the comparison between the real-time exhaust volume and the preset exhaust volume target value, and the current baking temperature of the temperature zone, adjust the hot air supply and / or heating power of the corresponding temperature zone to compensate for the heat carried away by the suction.

[0064] Specifically, the coating equipment is equipped with negative pressure sensors and / or flow sensors in each temperature zone. The negative pressure sensors are located in the negative pressure chamber or baking channel to detect the real-time negative pressure value within that temperature zone. The flow sensors are located in the exhaust duct of the negative pressure module 300 to detect the real-time exhaust volume. These sensors are connected to the controller and transmit the detected real-time negative pressure value and / or real-time exhaust volume to the controller.

[0065] In some embodiments, the coating equipment is provided with an air inlet 121 and an air supply volume adjustment mechanism in each temperature zone. The air inlet 121 is located near the bottom of the corresponding temperature zone and is used to introduce external fresh air and / or return gas into the temperature zone. The air supply volume adjustment mechanism can be a regulating valve, which is installed in the air supply pipeline and connected to the controller signal. The controller sends an opening control command to the air supply volume adjustment mechanism to increase or decrease the air supply volume based on the comparison result between the real-time negative pressure value and the preset negative pressure target value. When the real-time negative pressure value is lower than the preset negative pressure target value (i.e., the actual negative pressure is too high and the suction is too strong), the controller increases the air supply volume; when the real-time negative pressure value is higher than the preset negative pressure target value (i.e., the actual negative pressure is too low and the suction is insufficient), the controller decreases the air supply volume. External fresh air and / or return gas enter the temperature zone from bottom to top, compensating for the local air pressure drop caused by the continuous suction of the negative pressure module 300, so that the air pressure below the bearing surface does not deviate too much from the set value, which helps to maintain the air pressure stability of the negative pressure area. Meanwhile, the added gas is heated after entering the temperature zone, and can provide auxiliary heating to the lower surface of the sheet as it flows from bottom to top, which helps to reduce the temperature difference between the upper and lower surfaces of the sheet, thereby helping to improve the uniformity of drying in the thickness direction of the sheet.

[0066] In some embodiments, the drying device of the coating apparatus is configured as a heat source with adjustable heating capacity. When the drying device is a hot air drying method, this step is achieved by adjusting the hot air supply (e.g., by adjusting the fan speed or the opening of the air valve); when the drying device is an infrared heating method, this step is achieved by adjusting the heating power (e.g., by adjusting the output power of the infrared heating tube).

[0067] The controller makes a judgment based on the comparison between the real-time air volume and the preset air volume target value, combined with the current baking temperature of the temperature zone. If the change in air volume causes the actual temperature of the temperature zone to deviate from the set value, it sends an adjustment command to the drying device to increase or decrease the hot air supply and / or heating power to compensate for the heat loss caused by the suction and ensure that the actual baking temperature of the temperature zone is consistent with the set temperature.

[0068] In some embodiments, the replenishment air volume comes from external fresh air and / or the first return gas drawn by the negative pressure module 300, and the external fresh air is sent into the interior of the temperature zone through the replenishment air port 121.

[0069] The first reflux gas is refluxed using at least one of the following methods: Each temperature zone is equipped with an independent return air duct. The air inlet of each return air duct is connected to the negative pressure module 300 of the corresponding temperature zone, and the air outlet is connected to the interior of the same temperature zone, so that the gas drawn from each temperature zone flows back to the corresponding original temperature zone. The negative pressure modules 300 of each temperature zone are collected into the collection air box through the return air duct. The collection air box is connected to the interior of each temperature zone through branch pipes, so that the gas drawn into each temperature zone is collected by the collection air box and then distributed to the corresponding temperature zone.

[0070] In the first recirculation method, each temperature zone has its own independent return air duct. The gas drawn from a certain temperature zone by the negative pressure module 300 is directly returned to the same temperature zone through the return air duct. This method has a short return air path, a simple duct structure, and the gases in each temperature zone do not interfere with each other, which helps to avoid cross-contamination between temperature zones.

[0071] In the second recirculation method, the negative pressure modules 300 of each temperature zone are collected in the collection air box via return air ducts. The gases drawn from each temperature zone are mixed in the collection air box and then sent back to their respective temperature zones via branch pipes. The collection air box acts as a buffer and mixer, allowing the replenishment gas volume for each temperature zone to be flexibly allocated according to actual needs. When the negative pressure value of a certain temperature zone deviates significantly from the preset target value, more recirculation gas can be supplied to that temperature zone through the branch pipes of the collection air box for pressure compensation. In actual implementation, either of the above two recirculation methods can be used, or they can be used in combination.

[0072] In some embodiments, the sheet material is baked using a hot air drying method in each temperature zone. To achieve hot air drying, each temperature zone is equipped with a hot air nozzle 130 and a return air nozzle 140, which are arranged alternately along the travel path of the sheet material. The hot air nozzle 130 blows hot air onto the surface of the sheet material, and the return air nozzle 140 collects the hot air returned after the hot air blown out by the hot air nozzle 130 passes over the surface of the sheet material.

[0073] The controller is signal-connected to the air supply system (including heating device and fan) of the hot air nozzle 130, and adjusts the temperature of the hot air blown out of the hot air nozzle 130 by controlling the operating parameters of the air supply system (such as heating power, fan speed, etc.). The return air nozzle 140 is used to collect the hot air return air formed after the hot air blown out of the hot air nozzle 130 passes over the surface of the sheet material, and sends the collected hot air return air as a second return gas to the collection air box or directly back to the corresponding temperature zone to replenish the gas and / or heat in each temperature zone. After the hot air blown out of the hot air nozzle 130 comes into contact with the surface of the sheet material, it carries the solvent gas volatilized from the sheet material coating, forming a return air turbulence containing solvent volatile gas. When this part of the return air diffuses in the baking channel, it is drawn into the interior of the adjacent return air nozzle 140 by the air inlet. The staggered arrangement of the hot air nozzle 130 and the return air nozzle 140 ensures that the return air is promptly drawn in along the diffusion path, helping to prevent disorderly diffusion of the return air within the baking channel. Simultaneously, since the return air contains high heat, sending it back into the temperature zone as a secondary return gas helps reduce heat waste.

[0074] In some embodiments, the hot air nozzle 130 has its own return air structure. The return air structure is used to collect part of the return air formed after the hot air blown out by the hot air nozzle 130 passes over the surface of the sheet material, and send the collected return air as a third return gas to the collection air box or directly back to the corresponding temperature zone to replenish the gas and / or heat in each temperature zone. This "nozzle integrated return air" structural design allows each hot air nozzle 130 to collect part of the return air nearby while blowing out hot air, without relying on adjacent return air nozzles 140, which helps to shorten the return air path and improve the return air efficiency.

[0075] In actual equipment, independent return air nozzles 140 can be set only between the hot air nozzles 130, or the return air structure can be integrated only within the hot air nozzles 130 themselves, or both can be set simultaneously. The processing paths of the second and third return gases are similar to those of the first return gas. They can either be directly sent back to the corresponding temperature zone through independent return air ducts, or they can be collected in a collection box and then distributed to each temperature zone through branch ducts.

[0076] When a collection box is used for unified collection, the first, second, and third return gases can be mixed inside the collection box. The mixed gas has a relatively uniform temperature and composition, and is then sent to each temperature zone through branch pipelines, which helps to achieve a balanced distribution of gas supply volume and temperature in each temperature zone.

[0077] In the actual operation of the coating equipment provided in this application, the sheet material is supported by the conveying section of the conveying device 200 and enters the baking channel from the input end of the first oven module 100. Driven by the drive end 210, the conveying device 200 operates continuously, carrying the sheet material through the high-temperature oven module 100, the constant-temperature oven module 100, and the low-temperature oven module 100 in sequence, finally exiting from the output end of the last oven module 100. During the process of the sheet material passing through each oven module 100, the state detection device continuously acquires surface state information of the sheet material fragments in each temperature zone and sends it to the controller. Based on the received surface state information, the controller sends temperature control commands to the drying devices in each temperature zone, so that the baking temperature of each temperature zone is adjusted in real time according to the actual surface state of the sheet material in that temperature zone. Because the baking channels of adjacent modules are interconnected, the temperature change experienced by the sheet material at the temperature zone boundary is a gradual transition rather than a sudden change. This helps to alleviate the degree of thermal shock that the coating on the sheet material surface experiences at the temperature zone boundary, thereby helping to avoid quality problems such as cracking, blistering or decreased adhesion of the coating due to excessive temperature difference between adjacent temperature zones.

[0078] Furthermore, within each oven module 100, externally introduced hot air enters the hot air chamber 112 through the air inlet and is guided into the baking channel by the outlet of the hot air nozzle 130, blowing towards the upper surface of the sheet material. The hot air blowing towards the sheet material surface carries the solvent gas volatilized from the sheet material coating and forms a return air turbulence. This return air is drawn into the interior of the return air nozzle 140 located at an adjacent position by the air inlet. The return air collected by the return air nozzle 140 passes through the hot air chamber 112 via the return air duct 1113 and is then sent into the return air chamber 111. During the flow of the return air through the return air duct 1113, the return air exchanges heat with the hot air in the hot air chamber 112 through the duct wall, which helps to preheat the return air. After entering the return air chamber 111, the return air converges through the return air conveying duct 1112 to the return air outlet 1111 before being discharged. The cross-sectional area of ​​the return air conveying duct 1112 gradually increases from the return air outlet 1111 towards both ends, which helps to make the suction velocity at the return air inlets at various points in the duct more uniform. After being discharged through the return air outlet 1111, the return air is selectively returned to the hot air chamber 112 for recycling, returned to the baking channel to maintain flow field stability, or discharged to the outside for treatment, depending on the actual working conditions.

[0079] As the sheet material travels through each oven module 100, the negative pressure module 300 of each module continuously operates, forming a negative pressure zone below the bearing surface of the conveyor device 200. When the sheet material passes over the negative pressure zone, it is adsorbed and adhered to the bearing surface, preventing it from drifting or wrinkling due to hot air blowing. At the same time, the air inlet 121 supplies external fresh air and / or recirculated gas into the temperature zone to compensate for the local pressure drop caused by the continuous air extraction of the negative pressure module 300, maintaining the air pressure stability of the negative pressure zone; the recirculated gas and / or external fresh air flow from bottom to top, using their own residual heat to assist in heating the lower surface of the sheet material, which helps to reduce the temperature difference between the upper and lower surfaces of the sheet material.

[0080] In the coating equipment and method provided in this application, multiple functional modules such as temperature zone control, hot air circulation and recovery, continuous and stable conveying, negative pressure adsorption and fixation, and air pressure and heat compensation work together in the same equipment to complete the continuous baking and drying process of the sheet material in the high temperature zone 1, the constant temperature zone 2 and the low temperature zone 3.

[0081] In summary, the technical solution provided in this application acquires the surface state information of the sheet material in each temperature zone and adjusts the baking temperature of the corresponding zone in real time accordingly. This allows the baking temperature of each zone to dynamically change with the actual state changes of the sheet material during the drying process, helping to avoid insufficient or over-baking problems caused by using a fixed baking temperature. Simultaneously, the conveying unit of the conveying device 200 allows the sheet material to continuously travel between temperature zones, helping to avoid thermal shock damage caused by temperature jumps at the temperature zone boundaries. Furthermore, by setting controllers that are respectively connected to the state detection device and the drying device in each temperature zone, the baking temperature of each temperature zone can be independently controlled and dynamically adjusted, helping to improve the uniformity of sheet material baking and product quality. By compensating and controlling the replenishment air volume and hot air supply during the operation of the negative pressure module 300, it helps to maintain the stability of air pressure and temperature in each temperature zone, thereby helping to ensure the consistency of the adsorption and baking effects of the sheet material in each temperature zone.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0083] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A baking control method based on temperature-division segmentation, characterized in that, Includes the following steps: Control the operation of the conveying device (200) so that the sheet material is conveyed in the direction of continuous passage through the high temperature zone (1), the constant temperature zone (2) and the low temperature zone (3). Obtain surface state information of the sheet material located in the high temperature zone (1), the constant temperature zone (2), and the low temperature zone (3), respectively; Based on the surface condition information of the sheet material in each temperature zone, the baking temperature of the corresponding temperature zone is adjusted in real time.

2. The baking control method based on temperature segmentation according to claim 1, characterized in that, The surface condition information includes sheet surface temperature information, sheet surface coating moisture content information, and / or sheet surface coating curing status information.

3. The baking control method based on temperature segmentation according to claim 2, characterized in that, The moisture content information of the coating on the sheet material includes the first moisture content range corresponding to the high temperature zone (1), the second moisture content range corresponding to the constant temperature zone (2), and the third moisture content range corresponding to the low temperature zone (3), wherein the first moisture content range, the second moisture content range, and the third moisture content range decrease sequentially.

4. The baking control method based on temperature segmentation according to any one of claims 2 or 3, characterized in that, Obtaining surface state information of the sheet material located in the high-temperature zone (1), the constant-temperature zone (2), and the low-temperature zone (3), respectively, including: Obtain the first state information of the sheet surface before entering the high temperature zone (1); Obtain the second state information of the sheet surface within the high-temperature zone (1); Obtain the third state information of the sheet surface when it is about to leave the high temperature zone (1) and enter the constant temperature zone (2); Obtain the fourth state information of the sheet surface within the constant temperature zone (2); Obtain the fifth state information of the sheet surface when it is about to leave the constant temperature zone (2) and enter the low temperature zone (3); Obtain the sixth state information of the sheet surface within the low-temperature zone (3); Obtain the seventh state information of the sheet surface when it is ready to leave the low temperature zone (3).

5. The baking control method based on temperature segmentation according to claim 4, characterized in that, When the sheet material passes through each temperature zone under the support of the conveying device (200), it passes through the negative pressure area in each temperature zone. The negative pressure area is formed by the operation of the negative pressure module (300) set in the corresponding temperature zone. This includes the following when the sheet material passes through the negative pressure areas within each temperature zone: Obtain the real-time negative pressure value and / or real-time air volume of the negative pressure module (300) during operation in each temperature zone; Based on the comparison between the real-time negative pressure value and the preset negative pressure target value, the air supply volume of the corresponding temperature zone is adjusted to maintain the actual negative pressure value in the temperature zone within the allowable fluctuation range of the preset negative pressure target value. And / or, Based on the comparison between the real-time exhaust volume and the preset exhaust volume target value, and the current baking temperature of the temperature zone, the hot air supply and / or heating power of the corresponding temperature zone are adjusted to compensate for the heat carried away by the suction.

6. The baking control method based on temperature segmentation according to claim 5, characterized in that, The replenishment air volume comes from external fresh air and / or the first return air drawn by the negative pressure module (300); The first reflux gas is refluxed in at least one of the following ways: Each temperature zone is equipped with an independent return air duct. The air inlet of each return air duct is connected to the negative pressure module (300) of the corresponding temperature zone, and the air outlet is connected to the interior of the same temperature zone, so that the gas drawn from each temperature zone flows back to the corresponding original temperature zone. The negative pressure modules (300) of each temperature zone are collected into the collection air box through the return air duct. The collection air box is connected to the interior of each temperature zone through branch pipes so that the gas drawn into each temperature zone is collected by the collection air box and then diverted to the corresponding temperature zone.

7. The baking control method based on temperature segmentation according to claim 6, characterized in that, Each temperature zone uses hot air drying to bake the sheet material. The hot air drying method is configured as follows: each temperature zone is equipped with a hot air nozzle (130) and a return air nozzle (140). The hot air nozzle (130) and the return air nozzle (140) are arranged alternately along the passage path of the sheet material. The hot air nozzle (130) blows hot air onto the surface of the sheet material. The return air nozzle (140) is used to collect the hot air blown out by the hot air nozzle (130) after passing through the surface of the sheet material and to send the collected hot air return air as the second return gas to the collection air box or directly back to the corresponding temperature zone to replenish the gas and / or heat in each temperature zone. And / or, The hot air nozzle (130) is provided with a return air structure. The return air structure is used to collect part of the return air formed after the hot air blown out by the hot air nozzle (130) passes through the surface of the sheet material, and send the collected return air as the third return gas to the collection air box or directly back to the corresponding temperature zone to replenish the gas and / or heat in each temperature zone.

8. The baking control method based on temperature segmentation according to claim 1, characterized in that, The conveying device (200) is configured in at least one of the following ways: The conveying device (200) is provided with a conveying section, which is a continuous conveying structure and runs through all temperature zones along the sheet material conveying direction, so that the sheet material can be continuously and uninterruptedly conveyed between adjacent temperature zones. The conveying device (200) is provided with at least three conveying sections, and each temperature zone is provided with an independent conveying section. Each conveying section is controlled by its corresponding drive end (210) so that the conveying speed of the sheet material in each temperature zone can be adjusted independently.

9. The baking control method based on temperature segmentation according to claim 8, characterized in that, When the conveying section is a continuous conveying structure, the conveying device (200) operates at a single conveying speed and independently adjusts the baking temperature of each temperature zone according to the preset baking temperature target value corresponding to each temperature zone. When the conveying device (200) is provided with at least three conveying sections and each temperature zone is provided with an independent conveying section, the preset conveying speed target value and / or preset baking temperature target value corresponding to each temperature zone are obtained, and the conveying speed and / or baking temperature of the corresponding temperature zone are adjusted according to the preset conveying speed target value and / or preset baking temperature target value corresponding to each temperature zone.

10. A coating apparatus configured to perform the baking control method according to any one of claims 1 to 9, characterized in that, include: The oven module (100) is provided with a high temperature zone (1), a constant temperature zone (2) and a low temperature zone (3) in sequence along the sheet material conveying direction. The conveying device (200) has a conveying section for carrying the sheet material and driving the sheet material to travel along the sheet material conveying direction in the high temperature zone (1), the constant temperature zone (2) and the low temperature zone (3); The drying device is respectively set in the high temperature zone (1), the constant temperature zone (2) and the low temperature zone (3), and the drying device is used to provide drying heat to the sheet material in the corresponding temperature zone; A state detection device is respectively set in the high temperature zone (1), the constant temperature zone (2) and the low temperature zone (3) to obtain the surface state information of the sheet material in the corresponding temperature zone; A coating device is provided at the feed end of the oven module. The coating device is used to coat the slurry onto the surface of the sheet material. The coated sheet material enters the oven module (100) for drying. The controller is connected to the status detection device and the hot air supply device of each temperature zone, respectively, and is used to adjust the baking temperature of the corresponding temperature zone in real time according to the surface status information of the sheet material in each temperature zone.

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