An intelligent drying system for coating equipment

Abstract

The present invention relates to an intelligent drying system for coating equipment, which belongs to the technical field of coating equipment. The system includes several ovens, a control module and a detection module. The several ovens are connected end to end in sequence. Any of the ovens includes an air source and a heat exchanger for heating the air source. The control module is electrically connected to the air source and the heat exchanger respectively and controls the operating power of the air source and the heat exchanger. The detection module is used to detect the temperature in the several ovens and upload it to the control module; the control module is used to calculate the comprehensive ambient temperature parameter of a certain oven based on the temporal accumulation of temperature within a fixed time period. The control module determines whether the comprehensive ambient temperature parameter of a certain oven exceeds a threshold range. The control module reduces the heating power of the corresponding oven when the comprehensive ambient temperature parameter exceeds the threshold range, and increases the heating power of the corresponding oven when the comprehensive ambient temperature parameter is lower than the threshold range. The system has the advantage of high heating uniformity.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating equipment, and in particular relates to an intelligent drying system for coating equipment. Background Art

[0002] Coating equipment is used to evenly apply coatings, glues, membrane materials, and other substances to substrate surfaces. It is widely used in various industries, such as packaging, electronics, automotive construction, and textiles. The traditional coating process includes material selection, unwinding, gluing, glue drying, silicone oil application, silicone oil drying, back coating, anti-curling glue drying, water replenishment and rewetting, and winding. Drying is generally performed using multi-temperature zone automatic drying equipment.

[0003] Most of the traditional multi-temperature zone automatic control drying mechanisms control the air intake volume by time adjustment to grasp the drying progress. In fact, as the use time of the multi-temperature zone automatic control drying mechanism increases, the heat insulation and heat preservation efficiency of the multi-temperature zone automatic control drying mechanism will change. If no corresponding adjustment is made, the drying effect will become low, affecting the production efficiency. For this reason, Chinese patent CN217383647U discloses a multi-temperature zone automatic control drying mechanism, including a box body, an exhaust component and a sensor unit, the box body is provided with a drying cavity, the two ends of the drying cavity are respectively provided with a feed port and a discharge port, and the middle position of the drying cavity is provided with an aisle structure for paper to pass through; the exhaust component is arranged on the box body; the sensor unit is used to detect the temperature in the drying cavity; the exhaust component is adjusted according to the temperature parameter detected by the sensor unit to realize automatic control of the exhaust component power and achieve drying effect adjustment;

[0004] However, in the above scheme, it can only simply implement single feedback control by using real-time parameter trigger thresholds. The data collection and processing method is relatively simple and cannot cope with complex situations in the actual production process. For example, the temperature is maintained at a value close to but not exceeding the threshold range for a long time, which actually causes the temperature in the drying equipment to be too high. The temperature control mechanism cannot be triggered, and the drying effect cannot be adjusted. The data processing and judgment path is too single, and the drying adjustment effect is poor. Therefore, an intelligent drying system for coating equipment with multiple data collection and processing mechanisms and good drying adjustment effect is needed. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides an intelligent drying system for coating equipment, which has multiple collection, processing and judgment mechanisms and good drying and adjustment effects.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] An intelligent drying system for coating equipment includes a conveyor belt, a plurality of ovens arranged along and surrounding the conveyor belt, a control module, and a detection module. The ovens are connected end to end in sequence. Each oven includes an air source and a heat exchanger for heating the air source. The control module is electrically connected to the air source and the heat exchanger, respectively, and controls the operating power of the air source and the heat exchanger. The detection module is electrically connected to the control module and is used to detect the temperature within the ovens and upload the temperature to the control module.

[0008] The control module is used to calculate the comprehensive ambient temperature parameter of a certain oven based on the temporal accumulation of temperature within a fixed time period. The control module determines whether the comprehensive ambient temperature parameter of a certain oven exceeds a threshold range. The control module reduces the heating power of the corresponding oven when the comprehensive ambient temperature parameter exceeds the threshold range, and increases the heating power of the corresponding oven when the comprehensive ambient temperature parameter is below the threshold range.

[0009] As a preferred technical solution of the present invention, the detection module is used to detect the temperature wn in several ovens and upload it to the control module. The control module calculates the comprehensive ambient temperature parameter Zn of a certain oven and determines whether Zn exceeds the threshold range [Zmin, Zmax], where Zn= , f(t) is the function of the temperature in a certain oven changing with time, n is the oven number, t0 is the pre-entered detection time, Zmin and Zmax are the pre-entered upper and lower limits.

[0010] As a preferred technical solution of the present invention, any of the ovens is provided with an exhaust module, which is used to extract the exhaust gas in the oven from the oven and maintain the corresponding oven in a negative pressure state. Several of the exhaust modules are electrically connected to the control module respectively.

[0011] As a preferred technical solution of the present invention, any of the exhaust modules is provided with a ventilation duct, an exhaust duct and a circulation duct, the detection module is used to detect whether the LEL concentration in the ventilation duct exceeds the concentration threshold and upload the detection result to the control module, the ventilation duct is connected to the exhaust duct or the circulation duct through a switching valve, the ventilation duct is connected to the oven, the exhaust duct is connected to the outside world, the circulation duct is connected to the air source, the control module is electrically connected to the switching valve, and when the LEL concentration is lower than the concentration threshold, the control module instructs the switching valve to switch the ventilation duct to connect with the circulation duct, and when the LEL concentration is lower than the concentration threshold, the control module instructs the switching valve to switch the ventilation duct to connect with the exhaust channel.

[0012] As a preferred technical solution of the present invention, the circulation pipes of several exhaust modules are connected or disconnected with each other through a compensation channel. The control module is used to count whether the temperature consistency of several ovens is lower than a threshold value. When the judgment result is yes, the control module instructs the compensation channel to connect the circulation pipe corresponding to the oven with the highest temperature with the circulation pipe of the oven with the lowest temperature.

[0013] As a preferred technical solution of the present invention, the detection module is used to detect the LEL concentration N and upload it to the control module. The control module is pre-input with a concentration threshold N0. The control module calculates the comprehensive ambient temperature parameter Zn of a certain oven and determines whether Zn exceeds the threshold range [Zmin, Zmax×(1+A1)], where A1=1+[c×N0-N] / N0, N≤c×N0. When N>c×N0, N=0.5N0 is taken, c is a pre-input constant, 0.1≤c≤0.5.

[0014] As a preferred technical solution of the present invention, the control module determines whether the variance of several temperature data uploaded successively within a fixed time period of a certain oven exceeds a threshold. When the judgment result is yes, the control module extends the time period of the cumulative calculation when calculating the comprehensive ambient temperature parameters of this oven.

[0015] As a preferred technical solution of the present invention, the control module calculates the variance Ftn of a number of temperature data uploaded successively within a fixed time period of a certain oven, and the control module calculates the comprehensive ambient temperature parameter Zn of a certain oven, where Zn= , A2=Ftn / F0, F0 is the pre-input variance threshold, 0.8≤A2≤1.2.

[0016] As a preferred technical solution of the present invention, it further includes an input panel, which is used to input the values ​​of Zmin, Zmax, c and F0.

[0017] The beneficial effects of the present invention are:

[0018] (1) By setting the control module to calculate the comprehensive ambient temperature parameters of a certain oven based on the time accumulation of temperature in a fixed time period, and judging whether the temperature range is exceeded based on the comprehensive ambient temperature parameters, compared with using a simple real-time parameter trigger threshold to achieve single feedback control, the comprehensive ambient temperature parameters can better represent the temperature situation in the oven at the current time point, making the drying adjustment effect more in line with the actual environmental requirements, thereby improving the drying adjustment effect;

[0019] (2) By setting up ventilation ducts, exhaust ducts and circulation ducts in the exhaust module, when the LEL concentration exceeds the concentration threshold, the switching valve is instructed to switch the ventilation duct to connect with the circulation duct, thereby completing the waste heat recycling in the exhaust gas and immediately discharging the exhaust gas that cannot be recycled, thereby improving safety and reducing energy consumption;

[0020] (3) By setting the circulation pipes of several exhaust modules to be interconnected or disconnected through the compensation channel, when the temperature consistency of several ovens is too low, the compensation channel is instructed to connect the circulation pipe corresponding to the oven with the highest temperature with the circulation pipe corresponding to the oven with the lowest temperature, thereby achieving a more efficient application of waste heat, avoiding the situation where waste heat cannot be effectively utilized when one oven does not need to utilize waste heat while the temperature of another oven is low and the exhaust waste heat is insufficient, thereby further reducing energy consumption;

[0021] (4) By making the control module appropriately increase the upper temperature threshold according to the LEL concentration when the LEL concentration is low, at least half of the threshold level, that is, when the temperature and drying efficiency can be appropriately increased without worrying about the risk of waste gas, the power will not be triggered to adjust downward at a relatively high temperature, thereby reducing the weight of waste gas pollution in the production strategy when the waste gas hazard is less, and improving the drying efficiency;

[0022] (5) By making the control module extend the statistical time in the calculation process of the comprehensive ambient temperature parameters when the variance of several temperature data exceeds the threshold, the data collection range is expanded when the discrete value of the temperature data is too large and there is a high probability of temperature data collection distortion, and the proportion of abnormal data in the calculation is reduced. In exchange for the accuracy of temperature detection, a longer calculation time is used, so that the drying adjustment effect is more in line with the actual environmental requirements, and the drying adjustment effect is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 is a control loop block diagram of the present invention;

[0026] Description of main component symbols:

[0027] In the figure: 1. Oven; 2. Air source; 3. Air source valve; 4. Heat exchanger; 5. Air inlet fan; 6. Wind speed sensor; 7. Temperature sensor; 8. Switching valve; 9. Circulation duct; 10. Exhaust fan; 11. LEL detector; 12. Main exhaust duct. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figure 1-2 An intelligent drying system for coating equipment includes a conveyor belt, a plurality of ovens 1 arranged along and surrounding the conveyor belt, a control module, and a detection module. The plurality of ovens 1 are connected end to end in sequence. Each oven 1 includes an air source 2 and a heat exchanger for heating the air source 2. The air source 2 is used to supply gas to the oven 1. The control module is electrically connected to the air source 2 and the heat exchanger and controls the operating power of the air source 2 and the heat exchanger. The detection module is electrically connected to the control module and is used to detect the temperature inside the plurality of ovens 1 and upload the temperature to the control module.

[0030] Specifically, the conveyor belt is a linear conveyor belt, and each oven 1 is a hollow cube. The hollow cube oven 1 is covered outside the linear conveyor belt and surrounds the linear conveyor belt. The conveyor belt is used to carry the product through the cavities of several ovens 1 in sequence.

[0031] The air source 2 includes at least an external air source, an air pipe, and an air inlet fan 5 for driving the air flow in the air pipe. The air source 2 is introduced into the drying oven 1. Each drying oven 1 is provided with a set of air sources 2. The air source 2 introduces heated air into the drying oven 1 to dry the products on the conveyor belt in the drying oven 1.

[0032] The heat exchanger is arranged in the air path of the air source 2 at a position upstream of the air inlet fan 5 to heat the gas about to enter the air inlet fan 5. The heating mode of the heat exchanger 4 can be selected according to the actual situation of the user, such as steam heating, natural gas heating or electric heating;

[0033] During use, the conveyor belt is used to drive the products through the cavities of several ovens 1 in sequence. After the external air source introduces gas into the air pipe, the gas is heated by the heat exchanger 4, and then enters the cavity of the oven 1 under the drive of the air inlet fan 5 to dry the products on the conveyor belt in the oven 1.

[0034] A typical drying oven 1 is equipped with a basic threshold trigger mechanism based on real-time temperature to adjust the temperature. For example, it monitors the temperature in real time and reduces the power when the temperature exceeds the threshold. However, this solution cannot cope with complex situations in the actual production process. For example, if the temperature is maintained at a value close to but not exceeding the threshold for a long time, which actually causes the temperature in the drying equipment to be too high, its temperature control mechanism cannot be triggered, and thus the drying effect cannot be adjusted. Therefore, the control module is used to calculate the comprehensive ambient temperature parameter of a certain oven 1 based on the temporal accumulation of temperature within a fixed time period. The control module determines whether the comprehensive ambient temperature parameter of a certain oven 1 exceeds the threshold range. When the comprehensive ambient temperature parameter exceeds the threshold range, the control module reduces the heating power of the corresponding oven 1, and increases the heating power of the corresponding oven 1 when the comprehensive ambient temperature parameter is below the threshold range.

[0035] Regarding the calculation process of the comprehensive ambient temperature parameter, specifically, the detection module is used to detect the temperature wn in several ovens 1 and upload it to the control module. For the temperature data uploaded by each oven 1, the control module calculates the function fn(t) of the temperature wn of a certain oven 1 changing with time. The control module calculates the comprehensive ambient temperature parameter Zn of a certain oven 1 = , n is the oven number 1, for example, for oven number 1, the temperature is represented by w1, the function of oven 1 temperature changing with time is represented by f1(t), the comprehensive ambient temperature parameter is represented by Z1, t0 is the pre-entered detection time, Zmin and Zmax are the pre-entered upper and lower limits;

[0036] Zn= It represents the time integral of the temperature data of a certain oven 1 during the past period of time t0. When the temperature is always high but does not exceed the threshold during the period, the value of Zn is still large. Compared with the use of simple real-time parameter triggering threshold to achieve single feedback control, the comprehensive ambient temperature parameter can better represent the temperature situation in oven 1;

[0037] The control module then determines whether Zn exceeds the threshold range [Zmin, Zmax]. When Zn exceeds the threshold range, it means that the temperature inside the oven 1 is high and the heating power needs to be reduced. At this time, the control module reduces the heating power of the corresponding oven 1. When Zn is lower than the threshold range, it means that the temperature inside the oven 1 is low and the heating power needs to be increased. At this time, the control module increases the heating power of the corresponding oven 1.

[0038] By setting the control module to calculate the comprehensive ambient temperature parameters of a certain oven 1 based on the temporal accumulation of temperature within a fixed time period, and judging whether the temperature range is exceeded based on the comprehensive ambient temperature parameters, compared with using a simple real-time parameter trigger threshold to achieve single feedback control, the comprehensive ambient temperature parameters can better represent the ambient temperature in the oven 1 at the current time point, so that the drying adjustment effect is more in line with the actual environmental requirements, thereby improving the drying adjustment effect.

[0039] After the drying is completed, the substances in the product volatilize into the drying gas. At this time, the waste gas needs to be discharged in time and new gas needs to be introduced. For this purpose, each oven 1 is provided with an exhaust module, which is used to extract the waste gas in the oven 1 from the oven 1 and maintain the corresponding oven 1 in a negative pressure state. Several exhaust modules are electrically connected to the control module respectively;

[0040] Specifically, the exhaust module is provided with a ventilation duct and an exhaust duct, each exhaust duct is connected to the main exhaust duct 12, and the exhaust module also includes an exhaust fan 10. The exhaust gas in the oven 1 is sent by the exhaust fan 10 through the ventilation duct and the exhaust duct to the main exhaust duct 12 to complete the exhaust;

[0041] When the substances in the product volatilize into the dry gas, there is a probability that the gas will become dangerous flammable and explosive waste gas. The gas composition needs to be detected during the exhaust process, and the dangerous waste gas needs to be treated. For this reason, the exhaust module also includes a circulation pipe 9, and the ventilation pipe is connected to the exhaust pipe or the circulation pipe 9 through a switching valve 8. At this time, the ventilation pipe, the exhaust pipe and the circulation pipe 9 are connected in a three-way manner. The ventilation pipe is connected or cut off with the exhaust pipe or the circulation pipe 9 through the switching valve 8. At the same time, the ventilation pipe can only be connected to one of the exhaust pipe or the circulation pipe 9 at the same time. The circulation pipe 9 is connected to the air source 2. At the same time, the detection module is used to detect whether the LEL concentration in the ventilation pipe exceeds the concentration threshold and upload the detection result to the control module. When the LEL concentration is lower than the concentration threshold, the control module instructs the switching valve 8 to switch the ventilation pipe to connect with the circulation pipe 9. When the LEL concentration is lower than the concentration threshold, the control module instructs the switching valve 8 to switch the ventilation pipe to connect with the exhaust channel;

[0042] Specifically, the detection module performs LEL concentration detection on each exhaust module once per second and uploads it to the control module. The control module makes a judgment every time it receives the data;

[0043] When the LEL of the exhaust gas is lower than the standard value, it means that the exhaust gas still has recycling value and can be passed into the oven 1 for secondary use. At this time, the exhaust gas in the ventilation duct is passed into the air source 2, and a part of the exhaust gas is sent back into the oven 1 through the air inlet fan. Because the exhaust gas has a certain temperature, the air volume is recycled to reduce the proportion of cold air intake, thereby achieving the purpose of energy saving.

[0044] When the LEL of the exhaust gas is higher than the standard value, it means that the exhaust gas cannot be recycled and needs to be discharged. At this time, the exhaust gas in the ventilation pipe is passed into the exhaust pipe to complete the exhaust gas discharge;

[0045] By setting up ventilation ducts, exhaust ducts and circulation ducts 9 in the exhaust module, when the LEL concentration exceeds the concentration threshold, the switching valve 8 is instructed to switch the ventilation duct to connect with the circulation duct 9, thereby completing the recycling of waste heat in the exhaust gas and immediately discharging the exhaust gas that cannot be recycled, thereby improving safety and reducing energy consumption.

[0046] In some cases, the temperature of one oven 1 is relatively high and waste heat is not required, while the temperature of another oven 1 is relatively low and the exhaust waste heat is insufficient. In this case, one of the ovens 1 cannot use the waste heat where it is needed, and the energy saving effect is insufficient. Therefore, the circulation pipes 9 of several exhaust modules are interconnected or disconnected through the compensation channel. The control module is used to count whether the temperature consistency of several ovens 1 is lower than a threshold. When the judgment result is yes, the control module instructs the compensation channel to connect the circulation pipe 9 corresponding to the oven 1 with the highest temperature with the circulation pipe 9 of the oven 1 with the lowest temperature.

[0047] Specifically, the control module instructs the corresponding circulation pipe 9 to be connected to the circulation pipe 9 of the oven 1 with the lowest temperature only when it determines that the exhaust LEL concentration in the exhaust module corresponding to the oven 1 with the highest temperature is lower than the threshold value. If the judgment result is not, the control module finds the circulation pipe 9 corresponding to the oven 1 with the second highest temperature and connects it to the circulation pipe 9 of the oven 1 with the lowest temperature, and so on, to prevent the exhaust gas from entering the oven 1;

[0048] By arranging the circulation pipes 9 of several exhaust modules to be interconnected or disconnected through the compensation channel, when the temperature consistency of several ovens 1 is too low, the compensation channel is instructed to connect the circulation pipe 9 corresponding to the oven 1 with the highest temperature with the circulation pipe 9 of the oven 1 with the lowest temperature, thereby achieving a more efficient application of waste heat, avoiding the situation where waste heat cannot be effectively utilized when a certain oven 1 does not need to utilize waste heat while the temperature of another oven 1 is low and the exhaust waste heat is insufficient, thereby further reducing energy consumption.

[0049] The higher the drying efficiency, the faster the exhaust gas is generated. Therefore, when considering the temperature threshold range, it is necessary to consider the exhaust gas generation speed to avoid excessive exhaust gas generation due to excessively high temperature. Conversely, when the LEL concentration of the exhaust gas from a certain oven 1 is low, it means that the temperature and drying efficiency can be appropriately increased without worrying about the exhaust gas risk. The upper limit of the temperature threshold is appropriately increased, and the power downward adjustment will not be triggered at a relatively high temperature. For this reason, the detection module is used to detect the LEL concentration N and upload it to the control module. The control module is pre-input with the concentration threshold N0. The control module calculates the comprehensive ambient temperature parameter Zn of a certain oven 1 and determines whether Zn exceeds the threshold range [Zmin, Zmax×(1+A1)], where A1=1+[c×N0-N] / N0, N≤c×N0, when N>c×N0, take N=0.5N0, c is a pre-input constant, 0.1≤c≤0.5;

[0050] Take c=0.4 as an example;

[0051] When N>0.4N0, it means that the LEL concentration is high. At this time, there is no need to increase the threshold. A1=1+[c×N0-N] / N0=(0.4N0-0.4N0) / N0=0, Zmax×(1+A1)=Zmax, completing the threshold maintenance when the LEL concentration is high;

[0052] When N is small, less than c×N0, it means that the temperature and drying efficiency can be appropriately increased without worrying about the risk of exhaust gas. The upper limit of the temperature threshold is appropriately increased. At this time, the value of A1=1+[c×N0-N] / N0 is greater than 0, and Zmax×(1+A1) is greater than Zmax, completing the increase of the upper limit of the threshold when the LEL concentration is low.

[0053] By making the control module based on the LEL concentration, when the LEL concentration is low, at least half below the threshold level, the temperature and drying efficiency can be appropriately increased without worrying about the risk of waste gas. The upper temperature threshold is appropriately increased, and the power is not triggered to adjust downward at relatively high temperatures. This reduces the weight of waste gas pollution in the production strategy when the waste gas hazard is less, thereby improving the drying efficiency.

[0054] When calculating the comprehensive ambient temperature parameters, if the discrete value of the temperature data is too large, it indicates that there is a high probability of temperature data collection distortion. In this case, it is necessary to expand the data collection range and reduce the proportion of abnormal data in the calculation. The control module determines whether the variance of several temperature data uploaded successively within a fixed time period of a certain oven 1 exceeds a threshold. If the judgment result is yes, the control module extends the time period for the cumulative calculation when calculating the comprehensive ambient temperature parameters of this oven 1.

[0055] In the above calculation process, specifically, the control module calculates the variance Ftn of a number of temperature data uploaded successively within a fixed time period of a certain oven 1, and the control module calculates the comprehensive ambient temperature parameter Zn of a certain oven 1, where Zn= , A2=Ftn / F0, F0 is the pre-input variance threshold, 0.8≤A2≤1.2, when A2>1.2, take A2=1.2, when A2<0.8, A2=0.8;

[0056] When the discrete value of temperature data is too large, that is, Ftn is too large, the data collection range needs to be expanded. In this case, the value of t-t0×A2 is smaller than t-t0, and the time period from t-t0×A2 to t is longer. When calculating Zn, more f(wn) values ​​will be included in the calculation, completing the expansion of the data collection range and reducing the proportion of abnormal data in the calculation;

[0057] By making the control module extend the statistical time in the calculation process of the comprehensive ambient temperature parameters when the variance of several temperature data exceeds the threshold, the data collection range is expanded and the proportion of abnormal data in the calculation is reduced when the discrete value of the temperature data is too large and there is a high probability of temperature data collection distortion. By using longer calculation time in exchange for the accuracy of temperature detection, the drying adjustment effect is more in line with the actual environmental requirements, thereby further improving the drying adjustment effect.

[0058] The working principle and use process of the present invention:

[0059] During use, the conveyor belt is used to drive the products through the cavities of several ovens 1 in sequence. After the external air source introduces gas into the air pipe, the gas is heated by the heat exchanger 4, and then enters the cavity of the oven 1 under the drive of the air inlet fan 5 to dry the products on the conveyor belt in the oven 1.

[0060] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An intelligent drying system for coating equipment, characterized by: The system comprises a conveyor belt, a plurality of ovens arranged along and surrounding the conveyor belt, a control module, and a detection module. The plurality of ovens are connected end to end in sequence. Each oven comprises an air source and a heat exchanger for heating the air source. The control module is electrically connected to the air source and the heat exchanger, respectively, and controls the operating power of the air source and the heat exchanger. The detection module is electrically connected to the control module and is used to detect the temperature in the plurality of ovens and upload the temperature to the control module. The control module is configured to calculate a comprehensive ambient temperature parameter of a particular oven based on the temporal accumulation of temperature within a fixed time period, and to determine whether the comprehensive ambient temperature parameter of a particular oven exceeds a threshold range. The control module reduces the heating power of the corresponding oven when the comprehensive ambient temperature parameter exceeds the threshold range, and increases the heating power of the corresponding oven when the comprehensive ambient temperature parameter is below the threshold range. Each of the ovens is provided with an exhaust module, which is used to extract the exhaust gas in the oven from the oven and maintain the corresponding oven in a negative pressure state. Several of the exhaust modules are electrically connected to the control module respectively; Any of the exhaust modules is provided with a ventilation duct, an exhaust duct and a circulation duct, the detection module is used to detect whether the LEL concentration in the ventilation duct exceeds the concentration threshold and upload the detection result to the control module, the ventilation duct is connected to the exhaust duct or the circulation duct through a switching valve, the ventilation duct is connected to the oven, the exhaust duct is connected to the outside, and the circulation duct is connected to the air source, the control module is electrically connected to the switching valve, and when the LEL concentration is lower than the concentration threshold, the control module instructs the switching valve to switch the ventilation duct to connect with the circulation duct, and when the LEL concentration is higher than the concentration threshold, the control module instructs the switching valve to switch the ventilation duct to connect with the exhaust channel; The circulation pipes of the exhaust modules are connected or disconnected with each other through the compensation channel. The control module is used to count whether the temperature consistency of the ovens is lower than a threshold value. If the judgment result is yes, the control module instructs the compensation channel to connect the circulation pipe corresponding to the oven with the highest temperature with the circulation pipe corresponding to the oven with the lowest temperature. The detection module is used to detect the LEL concentration N and upload it to the control module. The control module is pre-input with a concentration threshold N0. The control module calculates the comprehensive ambient temperature parameter Zn of a certain oven and determines whether Zn exceeds the threshold range [Zmin, Zmax×(1+A1)], where A1=1+[c×N0-N] / N0, N≤c×N0. When N>c×N0, N=0.5N0 is taken, c is a pre-input constant, 0.1≤c≤0.

5.

2. The intelligent drying system for coating equipment according to claim 1, characterized in that: The control module determines whether the variance of a number of temperature data uploaded successively within a fixed time period of a certain oven exceeds a threshold. When the judgment result is yes, the control module extends the time period of the cumulative calculation when calculating the comprehensive ambient temperature parameters of this oven.

3. The intelligent drying system for coating equipment according to claim 2, characterized in that: The control module calculates the variance Ftn of several temperature data uploaded successively within a fixed time period of a certain oven, and calculates the comprehensive ambient temperature parameter Zn of a certain oven, where Zn= , A2=Ftn / F0, F0 is the pre-input variance threshold, 0.8≤A2≤1.

2.

4. The intelligent drying system for coating equipment according to claim 3, characterized in that: An input panel is also included for inputting values ​​of Zmin, Zmax, c, and F0.

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