Coating oven and heat treatment method thereof

Abstract

The invention relates to a coating oven and a heat treatment method thereof. The coating oven comprises a heat exchange unit and a directional air supply unit, the heat exchange unit is communicated with an air exchange unit of the coating oven, the air exchange unit comprises an exhaust assembly and an air inlet assembly, the air inlet assembly is connected with an air duct of the coating oven, and the heat exchange unit is used for recycling waste heat of gas exhausted by the exhaust assembly. Fresh air guided in through the air inlet assembly is preheated to a first temperature interval and then conveyed to the air duct; the directional air supply unit communicates with the air duct, the air outlet direction of the directional air supply unit faces the base material conveying area, and the directional air supply unit is used for guiding air in the air duct to the base material conveying area. According to the scheme, heat exchange can be conducted through the temperature difference between the high-temperature exhaust air and the low-temperature fresh air of the coating oven, so that energy waste is avoided, and meanwhile energy consumption needed by fresh air heating is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery manufacturing equipment, in particular to a coating oven and a heat treatment method thereof. BACKGROUND

[0002] In the coating equipment, after the completion of the wet coating process, the oven is needed to dry the wet surface substrate. The coating oven in the related art has the following defects: firstly, the high-temperature exhaust generated during the operation of the oven is usually directly discharged, and the exhaust temperature generally reaches 90℃. Direct discharge still causes 15-25% of the process energy loss, which not only violates the energy saving and environmental protection requirements, but also directly affects the production cost control of the enterprise; secondly, the fresh air preheating system and the directional heating mechanism of the oven often have problems such as unreasonable heat source configuration and insufficient temperature control precision, and it is difficult to achieve the precise temperature field distribution required by the coating process; in addition, the oven in the related art generally adopts a horizontal guide roller arrangement, which causes poor contact between the substrate and the roller surface during transmission, and easily causes shaking phenomenon, thereby causing quality problems such as coating fine lines and uneven thickness, which seriously affects the performance stability of the final product.

[0003] In view of the above problems, the related art needs to be improved. SUMMARY

[0004] To solve or partially solve the problems in the related art, the present application provides a coating oven and a heat treatment method thereof, which can utilize the temperature difference between the high-temperature exhaust and the low-temperature fresh air of the coating oven for heat exchange, thereby avoiding energy waste and reducing the energy consumption required for fresh air heating.

[0005] The first aspect of the present application provides a coating oven, comprising: A heat exchange unit is connected to the air exchange unit of the coating oven, the air exchange unit includes an exhaust assembly and an air inlet assembly, the air inlet assembly is connected to the air duct of the coating oven, the heat exchange unit is used to recover the waste heat of the gas discharged through the exhaust assembly, and the fresh air introduced through the air inlet assembly is preheated to a first temperature interval and then delivered to the air duct; A directional air supply unit is connected to the air duct, the air outlet direction of the directional air supply unit is directed towards the substrate transmission area, and the directional air supply unit is used to guide the gas in the air duct to the substrate transmission area.

[0006] In one embodiment, the coating oven comprises: A first heating assembly is connected to the air inlet assembly and is used to heat the fresh air introduced into the air duct to a second temperature interval.

[0007] In one embodiment, the coating oven comprises: An air flow driving component is provided in conjunction with the first heating component, and is used to increase the gas in the second temperature range heated by the first heating component to a preset speed and then introduce it into the directional air supply unit.

[0008] In one embodiment, the coating oven includes a second heating assembly, wherein the second heating assembly includes a heating portion, and the heating portion faces the substrate transfer area; When the temperature of the gas discharged from the directional air supply unit is lower than a set threshold, the second heating component is started, and the substrate is heated jointly by the first heating component and the second heating component; or, the first heating component is turned off, and the substrate is heated independently by the second heating component.

[0009] In one embodiment, the directional air supply unit includes a nozzle mechanism, and a plurality of the nozzle mechanisms are provided and arranged at intervals along the transmission direction of the substrate; the number of the second heating components is the same as the number of the nozzle mechanisms, and the second heating component is provided on the side of each of the nozzle mechanisms.

[0010] In one embodiment, the coating oven comprises: a plurality of guide rollers disposed in the coating oven, the guide rollers being arranged at intervals along a transmission path of the substrate, for supporting the substrate and guiding the substrate to move in a predetermined direction in the coating oven; The substrate flattening mechanism includes a first substrate flattening roller and a second substrate flattening roller, wherein the first substrate flattening roller is provided at the substrate inlet of the coating oven and is used to flatten the substrate and then feed it into the coating oven through the substrate inlet; the second substrate flattening roller is provided at the substrate outlet of the coating oven and is used to flatten the substrate and then feed it out of the coating oven through the substrate outlet; The sealing mechanism is provided at the substrate inlet and outlet of the coating oven. The sealing chamber mechanism includes a sealing chamber, which covers the substrate transmission path at the substrate inlet and outlet to form airtight isolation.

[0011] In one embodiment, the coating oven comprises: A first box and a second box are arranged in layers, wherein the substrate transmission path connects the first box and the second box in series, and the substrate in the first box is folded back and enters the second box; The first box and the second box respectively include a plurality of independent drying sections arranged in the direction of substrate travel, and each drying section is equipped with the directional air supply unit and the second heating assembly.

[0012] In one embodiment, the coating oven comprises: A gas flow regulating member is provided on the air inlet assembly, and is used to regulate the flow of fresh air introduced through the air inlet assembly; a temperature sensing unit, comprising a plurality of temperature sensors, respectively arranged at the exhaust assembly and the air inlet assembly of the coating oven, for monitoring the gas temperature of the exhaust assembly and the air inlet assembly; The controller is connected to the flow regulating element and the temperature sensing unit signal, and is used to obtain the temperature data collected by the temperature sensor and control the operating state of the flow regulating element based on the temperature data to adjust the heat exchange amount of the heat exchange unit.

[0013] A second aspect of the present application provides a heat treatment method of a coating oven as described in the first aspect above, comprising: Controlling the operation of the heat exchange unit to recover waste heat from the gas exhausted by the exhaust assembly and to deliver fresh air introduced through the air inlet assembly to the air duct; Obtaining preset parameters of exhaust gas from the exhaust component and input gas from the air inlet component per unit time, and dynamically calculating the heat exchange based on the preset parameters; The air flow rate of the air intake assembly is adjusted according to the heat exchange calculation result so that the fresh air introduced into the air duct is preheated to the first temperature range.

[0014] In one embodiment, obtaining preset parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component per unit time, and dynamically calculating the heat exchange amount based on the preset parameters, includes: Obtain the mass flow data, temperature difference data and constant-pressure heat capacity parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component; and dynamically calculate the heat exchange capacity based on the mass flow data, temperature difference data and the constant-pressure hot melt parameters.

[0015] The technical solution provided by this application may have the following beneficial effects: The technical solution of the present application is that the heat exchange unit is connected to the ventilation unit of the coating oven, and the ventilation unit includes an exhaust assembly and an air inlet assembly. The air inlet assembly is connected to the air duct of the coating oven. The heat exchange unit is used to recover the waste heat of the gas exhausted by the exhaust assembly and preheat the fresh air introduced through the air inlet assembly to a first temperature range before delivering it to the air duct. In this way, heat exchange can be carried out by utilizing the temperature difference between the high-temperature exhaust air of the exhaust assembly and the low-temperature fresh air of the air inlet assembly. Heat exchange can also be carried out by utilizing the temperature difference between the high-temperature exhaust air of the coating oven and the low-temperature fresh air, thereby avoiding energy waste and reducing the energy consumption required for heating the fresh air.

[0016] Furthermore, the technical solution of the present application is that the coating oven is provided with a first heating component and a second heating component. The present application can timely supplement heat through the second heating component when the temperature of the first heating component fluctuates, maintain the temperature stability of the substrate drying process, and reduce poor coating curing caused by insufficient temperature; in addition, under specific working conditions, the second heating component is switched to independent heating, which reduces the gas heating energy consumption and shortens the preheating time, thereby solving the problems of high energy consumption and inaccurate temperature control in the prior art.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 This is a front view of a coating oven shown in an embodiment of the present application; Figure 2 is a top view of a coating oven shown in an embodiment of the present application; Figure 3 Schematic diagram of the internal structure of the coating oven shown in the embodiment of the present application; Figure 4 It is a schematic flow chart of the heat treatment method of the coating oven shown in the embodiment of the present application.

[0020] Figure numerals: 100, coating oven; 101, first substrate flattening mechanism; 102, sealing mechanism; 103, lid opening mechanism; 1031, lower box body; 1032, upper box body; 104, second substrate flattening mechanism; 105, heat exchange unit; 106, ventilation unit; 107, first heating component; 108, transmission mechanism; 109, guide roller; 110, directional air supply unit; 1101, air duct; 111, second heating component; 112, substrate. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Instead, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0022] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0023] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0025] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0026] In related technologies, the high-temperature exhaust air generated during oven operation is typically discharged directly. These exhaust gases are generally high in temperature, and direct discharge still results in energy loss, which not only violates energy conservation and environmental protection requirements but also directly impacts the company's production cost control. To address these issues, the present invention provides a coating oven and treatment method thereof, which utilizes the temperature difference between the high-temperature exhaust air and the low-temperature fresh air from the coating oven for heat exchange, thereby avoiding energy waste and reducing the energy consumption required to heat the fresh air.

[0027] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a front view of a coating oven shown in an embodiment of the present application; Figure 2 is a top view of a coating oven shown in an embodiment of the present application; Figure 3 It is a schematic diagram of the internal structure of the coating oven shown in the embodiment of the present application.

[0029] See also Figure 1-Figure 3 The coating oven 100 provided in this application includes a heat exchange unit 105 and a directional air supply unit 110. The heat exchange unit 105 is connected to the coating oven ventilation unit 106. The ventilation unit 106 includes an exhaust assembly and an air inlet assembly. The air inlet assembly is connected to the air duct 1101 of the coating oven. The heat exchange unit 105 is used to recover the waste heat of the gas exhausted by the exhaust assembly and preheat the fresh air introduced through the air inlet assembly to a first temperature range (e.g., 40°C to 80°C) before delivering it to the air duct 1101. The directional air supply unit 110 is connected to the air duct 1101. The air outlet direction of the directional air supply unit 110 is toward the substrate 112 transmission area, and is used to guide the gas in the air duct 1101 to the substrate 112 transmission area. In this application, the substrate is a strip material such as copper foil or aluminum foil after wet coating.

[0030] In this embodiment, the exhaust assembly is connected to the oven exhaust duct, and its function is to exhaust the hot air with a temperature higher than 90°C in the coating oven 100. The air inlet assembly is connected to the external environment, and its function is to introduce unheated fresh air into the coating oven 100. The directional air supply unit 110 refers to an air supply mechanism with a directional airflow guiding function, and its function is to directly apply the gas preheated to the first temperature range to the wet coating surface of the substrate 112, accelerate the volatilization of the solvent and maintain the stability of the transmission path. During the operation of the coating oven, the high-temperature exhaust air of the exhaust assembly exchanges heat with the ambient fresh air introduced by the air inlet assembly. The preheated fresh air enters the air duct 1101 of the coating oven 100, and is then blown toward the surface of the substrate 112 at a specific angle and speed through the directional air supply unit 110.

[0031] Heat exchange unit 105 is a device that recovers energy through heat transfer between gases. Specifically, it can be implemented using a heat exchanger. Its function is to utilize the temperature difference between the high-temperature exhaust air from the exhaust assembly and the low-temperature fresh air from the intake assembly to exchange heat, reducing the external energy input required to heat the fresh air and thus reducing energy consumption.

[0032] Therefore, in the technical solution of the present application, the high-temperature exhaust air of the exhaust component of the ventilation unit is heat exchanged with the ambient fresh air introduced by the air intake component. The preheated fresh air enters the air duct of the coating oven 100 and is then blown toward the surface of the substrate 112 at a specific angle and speed through the directional air supply unit. The temperature difference between the high-temperature exhaust air of the exhaust component and the low-temperature fresh air of the air intake component is used for heat exchange, thereby reducing the external energy input required for heating the fresh air and thus reducing energy consumption.

[0033] Continue to see Figure 1 and Figure 2 In some embodiments, the coating oven of the present application includes a first heating component 107, which is connected to the air inlet component and is used to heat the fresh air introduced into the air duct from the first temperature range by the fresh air component to a second temperature range (for example, 80°C to 120°C). Specifically, the fresh air from the external environment is preheated by the heat exchanger of the heat exchange unit 105 to form a fresh air flow in the first temperature range. After entering the first heating component 107, the air flow is further heated to the second temperature range and then transported to the air duct 1101 inside the coating oven. In this process, the heat exchanger of the heat exchange unit 105 and the first heating component 107 form a two-stage temperature control structure, which not only reduces the energy consumption of the external heat source, but also ensures that the drying temperature meets the process requirements.

[0034] In some embodiments, the first heating component 107 is a liquid circulation heating mechanism or a steam circulation heating mechanism, specifically a thermal oil or steam heating mechanism, wherein the liquid circulation heating mechanism or the steam circulation heating mechanism refers to a heating device that uses thermal oil or steam as a heat medium.

[0035] Through the above technical solution, this application can recover the waste heat from the oven exhaust and increase the fresh air temperature to the range required by the process through two-stage temperature control, thereby reducing the consumption of external heat sources and ensuring the stability and reliability of temperature control during the drying process.

[0036] Furthermore, the coating oven of the present application includes an airflow drive member, which is arranged in conjunction with the first heating component 107. For example, it can be installed as an integral part of the first heating component, or installed downstream of the first heating component. The airflow drive member is used to increase the gas in the second temperature range after being heated by the first heating component 107 to a preset speed (for example, 18M / S) and then introduce it into the directional air supply unit 110. In the solution of the present application, the directional air supply unit 110 requires a maximum outlet air temperature of 120°C and an inlet air speed of 18M / S. On the one hand, the first heating component 107 can heat the hot air in the first temperature range to about 120°C through a thermal oil or steam heat exchanger, and then the inlet air speed of the directional air supply unit reaches the process requirement of about 18M / S through the airflow drive member.

[0037] Specifically, the airflow driving component refers to a device that can generate gas flow power, and a fan can be used specifically. The fan can mechanically drive the gas heated to the second temperature range to the transmission area of ​​the substrate 112, ensuring that the gas maintains a stable flow rate of about 18M / S when output through the directional air supply unit 110. In this way, the gas flow rate can be precisely controlled to match the evaporation rate of the surface of the substrate 112 during the drying process, avoiding heat accumulation due to unstable air flow velocity or temperature fluctuations caused by excessive speed, reducing the impact of airflow disturbances on the transmission stability of the substrate 112, ensuring that the wet coating surface of the substrate 112 is heated evenly, and improving the consistency of the coating drying quality.

[0038] See also Figure 3 Furthermore, the coating oven of the present application includes a second heating component 111, which includes a heating portion, and the heating portion faces the transmission area of ​​the substrate 112. In some embodiments, the directional air supply unit includes a nozzle mechanism, and a plurality of nozzle mechanisms are provided and arranged at intervals along the transmission direction of the substrate 112; the number of the second heating components 111 is the same as the number of nozzle mechanisms, and a second heating component 111 is provided on the side of each nozzle mechanism, that is, the second heating component 111 is arranged in parallel with the nozzle mechanism of the directional air supply unit 110. The second heating component 111 can be installed on the side of the nozzle mechanism of the air supply unit 110 inside the oven, and its heating portion remains parallel to the transmission plane of the substrate 112 and is separated by a set distance.

[0039] In some embodiments, the second heating element 111 may be a graphene infrared plate, which includes a heating portion. The heating portion refers to the heat release interface of the graphene infrared plate and can be implemented using a flat or curved structure. For example, a graphene heating film can be coated on a ceramic substrate to form a directional heating portion, allowing heat energy to penetrate the air layer in the form of electromagnetic waves and directly act on the wet coating of the substrate 112.

[0040] In this embodiment, when the temperature of the gas discharged from the directional air supply unit 110 falls below a set threshold, the second heating assembly 111 is activated, and the first heating assembly 107 and the second heating assembly 111 jointly heat the substrate 112. When the nozzle mechanism of the directional air supply unit 110 blows the preheated gas vertically toward the surface of the substrate 112, the second heating assembly 111 is simultaneously activated, and the infrared rays released by the heating element penetrate the gas layer and directly heat the wet coating. If a sudden change in the transmission speed of the substrate 112 causes a decrease in convective heat transfer efficiency, radiant heating can immediately compensate for the heat supply, preventing localized uneven drying of the coating surface.

[0041] Specifically, when the gas temperature output by the first heating component 107 is lower than the process requirement due to fluctuations in the external heat source or changes in the load, the controller sends a start-up command to the graphene infrared plate, causing it to emit infrared radiation, which directly penetrates the gas layer and acts on the wet coating surface for temperature compensation.

[0042] In some embodiments, when the temperature of the gas discharged from the directional air supply unit 110 falls below a set threshold, the first heating assembly 107 can be turned off, and the second heating assembly 111 can independently heat the substrate 112. In other words, in this mode, the first heating assembly 107 can be completely turned off, and the substrate 112 can be dried solely by the thermal radiation from the graphene infrared panel. At this time, the gas delivered by the directional air supply unit 110 serves only as a carrier gas to remove volatile substances.

[0043] Through the above technical solution, the present application can timely supplement heat through the second heating component 111 when temperature fluctuations occur in the first heating component 107, maintain the temperature stability of the substrate 112 during the drying process, and reduce poor coating curing caused by insufficient temperature; under specific working conditions, switch to infrared heating mode for independent heating, reduce gas heating energy consumption and shorten preheating time, thereby solving the problems of high energy consumption and inaccurate temperature control in the existing technology.

[0044] See also Figure 1 and Figure 3 In some embodiments, the substrate 112 transport area within the coating oven 100 is provided with a plurality of guide rollers 109 driven by a transmission mechanism 108. The transmission mechanism 108 may be, but is not limited to, a magnetic wheel transmission mechanism. The plurality of guide rollers 109 are spaced apart along the transport path of the substrate 112 to support the substrate 112 and guide the substrate 112 in a predetermined direction, thereby dynamically drying the substrate 112 during transport.

[0045] In some embodiments, a substrate flattening mechanism is provided at the substrate 112 outlet of the coating oven 100, and the substrate flattening mechanism includes a first substrate flattening roller 101 and a second substrate flattening roller 104. The first substrate flattening roller 101 is provided at the substrate inlet of the coating oven 100, and is used to flatten the substrate and then input the substrate into the coating oven 100 through the substrate inlet; the second substrate flattening roller 104 is provided at the substrate outlet of the coating oven 100, and is used to flatten the substrate and then output the substrate from the coating oven 100 through the substrate outlet; in some embodiments, the roller surface profiles of the first substrate flattening roller 101 and the second substrate flattening roller 104 can be set to an arc-shaped shape. The arc-shaped design can enable the substrate to stick to the roller surface of the guide roller for a long time, ensuring that the substrate 112 remains in a flat and unfolded state when entering the substrate inlet and being output from the substrate outlet. When the air outlet of the nozzle mechanism blows air downward to the wet coating surface of the substrate, it can avoid shaking of the substrate, thereby reducing fine lines after the substrate is dried, making the coating more uniform, and thus improving the performance of the battery product.

[0046] In some embodiments, a sealing mechanism 102 is provided at the substrate inlet and the substrate outlet of the coating oven 100. The sealing mechanism 102 includes a sealing cavity, which covers the substrate transmission path at the substrate inlet and the substrate outlet to form an airtight isolation. The sealing mechanism 102 can be a structure that forms a dynamic seal through pressure control, which can be specifically achieved by linking a vacuum pump with a pressure sensor. The airtight state is maintained by adjusting the pressure difference between the inside and outside of the sealing cavity in real time to prevent gas exchange inside and outside the coating oven 100. Specifically, the sealing mechanism 102 forms a dynamic isolation barrier at the substrate inlet and the substrate outlet by covering the cavity structure of the substrate transmission path, and adjusts the operation of the vacuum pump in combination with the pressure sensor feedback, so that the pressure in the sealing cavity is always lower than the external environment, thereby suppressing the escape of gas inside and outside the coating oven 100.

[0047] Continue to see Figure 1 In some embodiments, the coating oven 100 includes a first box A and a second box B, each arranged in layers. The first box A and the second box B are respectively used to heat and dry both sides of the substrate. The first box A and the second box B each include multiple heating sections arranged along the length of the box, for example, three heating sections (s1, s2, s3). Multiple heating sections refer to several independently temperature-controlled areas within each box along the direction of substrate transport. Specifically, they can be implemented using a combination of a split welded frame and a thermal insulation layer. Each heating section (s1, s2, s3) is equipped with a directional air supply unit 110, and the first heating assembly 107 is connected to the directional air supply units 110 of the multiple heating sections.

[0048] It is worth noting that the first box A and the second box B of the present application respectively include three or more heating sections arranged along the length direction of the coating oven 100, such as four, five, six, etc. The present application does not limit the number of heating sections.

[0049] Each heating section is independently configured with a directional air supply unit 110 and a second heating assembly 111. Independent control of different drying stages is achieved through a zoning layout. The heat output is adjusted in sections to match the drying requirements of different positions of the substrate. The layered arrangement of the first box A and the second box B refers to dividing the oven into two independent box structures, the first box A and the second box B each comprising a lower box 1031 and an upper box 1032, the lower box 1031 and the upper box 1032 being hinged on one side, and an opening and closing portion on the other side, the opening and closing portion being provided with a cover opening mechanism 103, the cover opening mechanism 103 being used to control the closing or opening of the lower box 1031 and the upper box 1032, the upper box 1032 being flipped upward when maintenance is required, and the upper box 1032 being flipped downward to cover the lower box 1031 during the drying operation and locked by the cover opening mechanism 103.

[0050] In some embodiments, the coating oven of the present application further comprises a flow regulating member, a temperature sensing unit and a controller. The gas flow regulating member is arranged in the air inlet assembly, and is used to regulate the flow of fresh air introduced through the air inlet assembly; the temperature sensing unit comprises a plurality of temperature sensors arranged in the exhaust assembly and the air inlet assembly of the coating oven respectively, and is used to monitor the gas temperature of the exhaust assembly and the air inlet assembly; the controller is in signal connection with the flow regulating member and the temperature sensing unit, and is used to acquire the temperature data collected by the temperature sensors, and control the operating state of the flow regulating member based on the temperature data, so as to regulate the heat exchange amount of the heat exchange unit.

[0051] The gas flow regulating member is a device for dynamically controlling the flow area of the fresh air inlet, and can be implemented by using an electric air valve or a variable frequency air fan. The heat exchange efficiency of the heat exchange unit 105 is optimized by regulating the flow of fresh air. The temperature sensor is a temperature measuring device distributed in the input and output pipelines of the heat exchange unit 105, and can be implemented by using a thermocouple or an infrared sensor, and is used to monitor the temperature change of the exhaust air, the fresh air and the preheated gas in real time. The controller is an automatic module integrating data processing and logical operation functions, and can be implemented by using a PLC or an industrial computer. The controller receives temperature data and outputs control signals to realize closed-loop regulation of the operating parameters of the heat exchange unit 105.

[0052] Specifically, the heat exchange unit 105 recovers the waste heat of the high-temperature exhaust gas in the oven exhaust passage through the heat exchanger, and then introduces the external environment fresh air. The preheated fresh air is transported to the air duct 1101. The gas flow regulating member dynamically adjusts the flow of the fresh air inlet according to the heat load demand inside the oven, so that the input amount of fresh air and the waste heat recovery amount of exhaust air are matched. The temperature sensor collects temperature data of the exhaust inlet, the fresh air inlet and the output end after preheating in real time. The controller analyzes the temperature change trend based on a preset algorithm, and automatically adjusts the operating parameters of the heat exchange unit 105, such as adjusting the opening degree of the air valve or the rotating speed of the fan, to maintain the preheated gas temperature in the target first temperature range.

[0053] Correspondingly, the present application also provides a heat treatment method based on the coating oven of the above embodiments.

[0054] Figure 4 is a flow diagram of the heat treatment method of the coating oven according to the embodiments of the present application.

[0055] Referring to Figure 4 The method comprises the following steps: S110, controlling the heat exchange unit to operate, so as to recover the waste heat of the gas discharged through the exhaust assembly, and transport the fresh air introduced through the air inlet assembly to the air duct.

[0056] In this step, after the heat exchange unit 105 is in operation, the high-temperature exhaust gas of the coating oven and the normal-temperature fresh air form a counter-flow channel in the heat exchanger, and the heat carried by the high-temperature exhaust gas is continuously transferred to the fresh air through the wall of the heat exchanger.

[0057] S120: Obtain preset parameters of the exhaust gas of the exhaust component and the input gas of the air intake component within a unit time, and dynamically calculate the heat exchange based on the preset parameters.

[0058] In this step, the temperature sensing unit collects the gas parameters flowing through the exhaust component and the air inlet component in real time, inputs the gas parameters into the heat calculation model, and derives the total heat exchange amount absorbed by the fresh air per unit time in real time through the energy conservation relationship.

[0059] S130 , adjusting the air flow rate of the air intake assembly according to the heat exchange calculation result, so that the fresh air introduced into the air duct is preheated to a first temperature range.

[0060] In this step, a flow control instruction is generated based on the heat exchange calculation results to dynamically control the opening of the gas flow control element in the fresh air duct. By increasing or decreasing the fresh air flow rate, the fresh air temperature output by the heat exchanger is maintained within a preset first temperature range, forming a closed loop of temperature and flow control.

[0061] Therefore, the technical solution of the present application controls the operation of the heat exchange unit to recover the waste heat of the gas discharged by the exhaust component, and delivers the fresh air introduced through the air intake component to the air duct, and then obtains the preset parameters of the exhaust gas of the exhaust component and the input gas of the air intake component per unit time, and dynamically calculates the heat exchange rate based on the preset parameters; adjusts the air intake flow rate of the air intake component according to the heat exchange calculation result, so that the fresh air introduced into the air duct is preheated to the first temperature range; in this way, the temperature difference between the high-temperature exhaust air of the exhaust component and the low-temperature fresh air of the air intake component can be used for heat exchange, thereby reducing the external energy input required for fresh air heating, thereby reducing energy consumption.

[0062] In some embodiments, obtaining preset parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component per unit time, and dynamically calculating the heat exchange amount based on the preset parameters, includes: The mass flow data, temperature difference data and constant-pressure heat capacity parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component are obtained; and the heat exchange capacity is dynamically calculated based on the mass flow data, temperature difference data and constant-pressure hot melt parameters.

[0063] Specifically, the mass flow rate data of fresh air from the air inlet component can be continuously collected through a mass flow meter, and the readings of temperature sensors installed at the inlet and outlet of the fresh air channel of the heat exchanger can be compared to obtain real-time temperature difference data. The pre-stored gas physical property parameter table can be called to obtain the constant-pressure heat capacity reference value under the current working conditions, and the above-mentioned gas parameters can be continuously output through a physical heat conduction model to obtain the instantaneous value of the heat exchange rate.

[0064] In related technologies, the exhaust and return air from coating ovens are operated at approximately isobaric conditions. The temperature of the hot exhaust air from the oven is generally ≥90°C. Direct discharge of the hot air wastes energy, which accounts for approximately 15-25% of the coating process. In the technical solution of this application, the heat absorption and release of the heat exchanger can be calculated by the enthalpy difference between the inlet and outlet temperatures of the fresh air duct. The total heat exchanged per unit time (Q) absorbed by the fresh air is calculated using the following formula. The fresh air can then be heated to the first temperature range after waste heat recovery.

[0065] Q=m×△i=m×cp×△T In the above formula, Q is the total heat exchange capacity (Kj / s or kW); cp is the specific heat capacity at constant pressure (j / (kg.K); ΔTw is the gas inlet and outlet temperature (°C); and m is the gas mass flow rate (kg / s). Using the above formula, fresh air at approximately 25°C or room temperature can be heated to a first temperature range (e.g., 40°C to 80°C) after waste heat recovery.

[0066] The solution of the present application avoids the problems of waste heat from exhaust of coating ovens and excessive energy consumption of fresh air preheating in related technologies. By dynamically adjusting the fresh air flow rate and the waste heat recovery ratio, the preheating temperature is ensured to be stable and controllable, the energy consumption of external heat sources is reduced, and the risk of substrate coating defects caused by temperature fluctuations is reduced.

[0067] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A coating oven, characterized in that, include: a heat exchange unit connected to a ventilation unit of the coating oven, the ventilation unit comprising an exhaust assembly and an air inlet assembly, the air inlet assembly being connected to an air duct of the coating oven, the heat exchange unit being used to recover waste heat from the gas exhausted by the exhaust assembly and preheat fresh air introduced through the air inlet assembly to a first temperature range before delivering it to the air duct; A directional air supply unit is connected to the air duct, and the air outlet direction of the directional air supply unit is toward the substrate transmission area, and is used to guide the gas in the air duct to the substrate transmission area.

2. The coating oven according to claim 1, characterized in that include: The first heating component is connected to the air inlet component and is used to heat the fresh air introduced into the air duct by the fresh air component in the first temperature range to a second temperature range.

3. The coating oven according to claim 2, characterized in that include: An air flow driving component is provided in conjunction with the first heating component, and is used to increase the gas in the second temperature range heated by the first heating component to a preset speed and then introduce it into the directional air supply unit.

4. The coating oven according to claim 2, characterized in that include: a second heating assembly, the second heating assembly comprising a heating portion, the heating portion facing the substrate transmission area; When the temperature of the gas discharged from the directional air supply unit is lower than a set threshold, the second heating component is started, and the substrate is heated jointly by the first heating component and the second heating component; or, the first heating component is turned off, and the substrate is heated independently by the second heating component.

5. The coating oven according to claim 4, characterized in that: The directional air supply unit includes a nozzle mechanism, and the nozzle mechanism is provided in plurality and arranged at intervals along the transmission direction of the substrate; the number of the second heating components is the same as the number of the nozzle mechanisms, and the second heating component is provided on the side of each nozzle mechanism.

6. The coating oven according to claim 1, characterized in that include: a plurality of guide rollers disposed in the coating oven, the guide rollers being arranged at intervals along a transmission path of the substrate, for supporting the substrate and guiding the substrate to move in a predetermined direction in the coating oven; The substrate flattening mechanism includes a first substrate flattening roller and a second substrate flattening roller, wherein the first substrate flattening roller is provided at the substrate inlet of the coating oven and is used to flatten the substrate and then feed it into the coating oven through the substrate inlet; the second substrate flattening roller is provided at the substrate outlet of the coating oven and is used to flatten the substrate and then feed it out of the coating oven through the substrate outlet; The sealing mechanism is provided at the substrate inlet and the substrate outlet of the coating oven. The sealing chamber mechanism includes a sealing chamber, which covers the substrate transmission paths at the substrate inlet and the substrate outlet to form airtight isolation.

7. The coating oven according to claim 2, characterized in that include: A first box and a second box are arranged in layers, wherein the substrate transmission path connects the first box and the second box in series, and the substrate in the first box is turned back and enters the second box; The first box and the second box respectively include a plurality of independent drying sections arranged in the direction of substrate travel, and each drying section is equipped with the directional air supply unit and the second heating assembly.

8. The coating oven according to any one of claims 1 to 7, characterized in that: include: A gas flow regulating member is provided on the air inlet assembly, and is used to regulate the flow of fresh air introduced through the air inlet assembly; a temperature sensing unit, comprising a plurality of temperature sensors, respectively arranged at the exhaust assembly and the air inlet assembly of the coating oven, for monitoring the gas temperature of the exhaust assembly and the air inlet assembly; The controller is connected to the flow regulating element and the temperature sensing unit signal, and is used to obtain the temperature data collected by the temperature sensor and control the operating state of the flow regulating element based on the temperature data to adjust the heat exchange amount of the heat exchange unit.

9. A heat treatment method of a coating oven according to any one of claims 1 to 8, characterized in that: include: Controlling the operation of the heat exchange unit to recover waste heat from the gas exhausted by the exhaust component and delivering fresh air introduced by the air inlet component to the air duct; Obtaining preset parameters of exhaust gas from the exhaust component and input gas from the air inlet component per unit time, and dynamically calculating the heat exchange based on the preset parameters; The air flow rate of the air intake assembly is adjusted according to the heat exchange calculation result so that the fresh air introduced into the air duct is preheated to the first temperature range.

10. The method according to claim 9, characterized in that The obtaining of preset parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component per unit time, and dynamically calculating the heat exchange amount based on the preset parameters, includes: Obtain the mass flow data, temperature difference data and constant-pressure heat capacity parameters of the exhaust gas of the exhaust component and the input gas of the air inlet component; and dynamically calculate the heat exchange capacity based on the mass flow data, temperature difference data and the constant-pressure hot melt parameters.

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