Intelligent temperature control method for paperboard production

Abstract

The present application relates to the technical field of carton production, and discloses an intelligent paperboard temperature control method, which comprises the following steps: based on the moisture content physical index of corrugated base paper before production, comprehensively obtaining the steam output of a steam pressing plate by using the temperature information and humidity information of the current production; constructing a function fuzzy rule by using the temperature information and moisture content of the corrugated paper, obtaining the premise credibility of each rule in the function fuzzy rule based on the temperature information and moisture content, and obtaining the premise credibility of the steam output of the steam pressing plate by using the premise credibility of the rule; calculating the output of the adjusting object in the function fuzzy rule, and obtaining the adjusting value by using the reverse fuzzy, and adjusting the adjusting object by using the adjusting value. The present application combines the corrugated environment temperature and the temperature of the corrugated paper itself in the process of processing the corrugated base paper into corrugated paper by using steam high-temperature processing, realizes real-time monitoring, ensures that the quantitative steam delivery meets the required temperature of the corrugated base paper production, and reduces the moisture loss phenomenon of the corrugated base paper.

Description

Technical Field

[0001] This invention relates to the technical field of cardboard box production, and specifically to an intelligent method for temperature control in cardboard production. Background Technology

[0002] Corrugated cardboard is made by corrugating base paper to form a wavy corrugated core, and then gluing linerboard to the top and bottom of the core with adhesive to form a thick sheet of paper. Generally, corrugated cardboard is thicker than 0.1mm and has a basis weight of 250g / m³. 2 The above describes how corrugated cardboard boxes are formed by folding corrugated cardboard to create a box structure. Corrugated cardboard boxes, with their superior performance and good processing properties, have gradually replaced wooden boxes and other transport packaging containers, becoming the mainstay of transport packaging.

[0003] Therefore, in the production process of corrugated base paper into corrugated board, a certain high temperature is required to supply the corrugating machine. The corrugating machine processes the corrugated base paper into corrugated board. This high temperature is generally achieved by generating steam in a boiler and using the heat of the steam to supply the corrugating machine. However, since our company is located in Chongqing, where the climate is a subtropical monsoon climate, the area is in a high-humidity state all year round. Therefore, in order to ensure that the corrugating machine can process the corrugated base paper into corrugated board through high-temperature steam, a large amount of steam is generally supplied to the corrugating machine through a boiler, and the heat of the steam is used to heat the corrugated base paper in a high-humidity state.

[0004] Therefore, our company discovered that the inability to monitor the temperature of the corrugated base paper during processing easily leads to excessive steam being supplied to the corrugating machine. This causes the machine's operating temperature to exceed the temperature required for processing the base paper into corrugated paper, resulting in overheating and moisture loss. Consequently, during the adhesive bonding process on the single-facer, the amount of adhesive applied needs to be increased, leading to excessive water absorption in the overheated areas of the base paper. This can cause moisture imbalance among the layers of the base paper, resulting in insufficient bonding strength between the layers. Consequently, the corrugated paper becomes brittle, reducing its ring crush resistance and bursting strength, deteriorating its physical properties, and causing unevenness and cracking of the cardboard. Summary of the Invention

[0005] This invention aims to provide an intelligent temperature control method for corrugated paperboard production. It combines the temperature of the corrugated environment and the corrugated paper itself during the process of processing corrugated base paper into corrugated paper with high temperature steam, and monitors in real time to ensure that the quantitative delivery of steam meets the temperature required for corrugated base paper production, thereby reducing the phenomenon of moisture loss in corrugated base paper.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] 1) An intelligent temperature control method for paperboard production, comprising:

[0008] The physical index of moisture content of corrugated base paper before production is obtained, and the temperature and humidity information of corrugated base paper production on the same day are collected simultaneously. Based on the physical index of moisture content of corrugated base paper before production, and combined with the temperature and humidity information of production on the same day, the initial steam output of the steam press is obtained.

[0009] The corrugated base paper is heated by steam to form corrugated paper using the initial steam output of the steam press plate. The temperature and moisture content of the corrugated paper are collected. A fuzzy rule function is constructed using the temperature and moisture content of the corrugated paper. The premise confidence of each rule in the fuzzy rule function is obtained based on the temperature and moisture content. The premise confidence of the steam output of the steam press plate is obtained using the premise confidence of the rule function.

[0010] The speed at which corrugated base paper is conveyed through a steam press to form corrugated paper is taken as the adjustment object, and the number of consecutive adjustments is determined. If the number of adjustments exceeds a threshold, the steam conveying capacity of the steam press is taken as the adjustment object; otherwise, the adjustment object is determined based on the reliability of the corrugated paper conveying speed. The output of the adjustment object in the function fuzzy rule is calculated, and the adjustment value is obtained by reverse fuzzification. The adjustment value is then used to adjust the adjustment object.

[0011] In the above technical solution, the steam output of the steam pressure plate and the conveying speed of corrugated paper production are controlled. When the initial state is set, the physical index of moisture content of corrugated base paper before production is obtained. Temperature and humidity information of corrugated base paper production on the same day are collected simultaneously. The steam output of the steam pressure plate is initially determined by combining the physical index of moisture content of corrugated base paper before production with the temperature and humidity information of corrugated base paper production on the same day.

[0012] During the operation, the steam output of the initial steam pressure plate is fed into the corrugating machine, and the corrugated paper is heated by steam through the steam pressure plate of the corrugating machine to obtain corrugated paper. The temperature and moisture content of the corrugated paper are collected from the output corrugated paper. The temperature and moisture content of the corrugated paper collected multiple times are used to construct a functional fuzzy rule, and the temperature and moisture content are used as the premise confidence of each rule in the functional fuzzy rule.

[0013] In use, this invention not only controls the steam output of the steam press, but also adjusts the corrugated paper conveying speed as the regulating object based on the conveying speed of the corrugated paper after passing through the steam press. When the number of times the corrugated paper conveying speed is adjusted exceeds a threshold, the steam conveying volume of the steam press is adjusted. Otherwise, the adjustment object is determined based on the reliability of the premise of the corrugated paper conveying speed. The higher the reliability of the premise, the more the premise of the rule matches the current input, and the more accurate the adjustment value is. This combines the corrugated environment temperature and the corrugated paper's own temperature during the high-temperature steam processing of the corrugated paper to ensure that the quantitative steam delivery meets the temperature required for corrugated paper production, reducing the phenomenon of moisture loss in the corrugated paper.

[0014] 2) According to the intelligent paperboard production temperature control method described in 1), the method involves obtaining the physical index of moisture content of corrugated base paper before production, simultaneously collecting temperature and humidity information of the corrugated base paper produced on the same day, and initially obtaining the steam output of the steam press based on the physical index of moisture content of corrugated base paper before production and the combined temperature and humidity information of the same day's production. This includes the following steps:

[0015] Step S1: Multiple sets of temperature and humidity sensors are installed in the corrugated paper production line, and all temperature and humidity sensors are monitored online.

[0016] Step S2: The humidity sensor set in the corrugated base paper storage area is used to detect the physical index of moisture content of corrugated base paper before production. When the physical index of moisture content of corrugated base paper before production meets the standard in the corrugated production line, the corrugated base paper in the storage area is started to be used. Otherwise, the production of corrugated base paper that does not meet the standard is stopped and labeled as unqualified.

[0017] Step S3: By setting temperature and humidity sensors in the corrugated production line environment, the temperature sensor collects the temperature information of the corrugated base paper produced on the same day, and the humidity sensor collects the humidity information of the corrugated base paper produced on the same day.

[0018] Step S4: Based on step S3, the steam output of the initial steam press is obtained using the temperature and humidity information of the day's production. The corrugated base paper in the storage area is started and corrugated by the steam press. The steam output of the initial steam press is used to achieve the heating temperature of the corrugated base paper. The temperature and moisture content are precisely controlled during the steam output process.

[0019] 3) According to the intelligent paperboard production temperature control method described in 2), the precise control of temperature information and moisture content during the steam output transmission process specifically includes: real-time monitoring of temperature information and moisture content during the steam output transmission process;

[0020] Based on changes in temperature information, the steam output is adjusted using the first calculation formula.

[0021] The steam output is adjusted according to the change in moisture content using the second calculation formula.

[0022] The first calculation formula is:

[0023] YT = k1 × (PT - YP) × DT

[0024] Where YT is the steam output, k1 is the first adjustment coefficient, PT is the average temperature, YP is the preset average temperature, and DT is the current steam output temperature;

[0025] The second calculation formula is:

[0026] YT = k2 × (PY - YY) × DT

[0027] Where k2 is the second adjustment coefficient, PY is the average moisture content, and YY is the preset average moisture content.

[0028] 4) According to the intelligent paperboard temperature control method described in 1), the corrugated base paper is heated by steam to form corrugated paper using the initial steam output of the steam press to form corrugated paper, and the temperature and moisture content of the corrugated paper itself are collected. A fuzzy rule function is constructed using the temperature and moisture content of the corrugated paper itself, including the following steps:

[0029] Step S1: The corrugated base paper in the storage area is started and corrugated by a steam press to form corrugated paper. The initial steam output of the steam press is used to heat the corrugated base paper to the desired temperature.

[0030] Step S2: A temperature sensor for detecting the temperature information of the corrugated paper and a humidity sensor for detecting the moisture content of the corrugated paper are set in the corrugated paper conveying direction. The temperature information of the corrugated paper is collected by the temperature sensor and the moisture content of the corrugated paper is collected by the humidity sensor.

[0031] Step S3: Substitute the temperature information of the corrugated paper itself into the temperature membership function to obtain the temperature membership degree. At the same time, substitute the moisture content of the corrugated paper itself into the moisture content membership function to obtain the moisture content membership degree. Arrange the temperature membership degree from the minimum to the maximum value to obtain the temperature function fuzzy rule, and arrange the moisture content membership degree from the minimum to the maximum value to obtain the moisture content function fuzzy rule.

[0032] 5) According to the intelligent paperboard production temperature control method described in 1), the premise confidence level of each rule in the fuzzy rule of the function is obtained based on the temperature information and moisture content, and the premise confidence level of the steam output of the steam press is obtained using the premise confidence level of the rules, specifically:

[0033] Substitute the temperature information and water content into the membership functions of temperature and water content respectively to obtain the membership degree;

[0034] The minimum value of the membership degree of temperature and the membership degree of moisture content in the fuzzy control rule is used as the premise confidence of the rule.

[0035] 6) According to the intelligent paperboard production temperature control method described in 1), the premise confidence of obtaining the steam output of the steam press using the premise confidence of the rule is specifically as follows:

[0036] The sum of the premise confidence of each fuzzy rule for obtaining the steam output of the steam pressure plate is used to obtain the premise confidence of steam output regulation;

[0037] The sum of the premise confidence of each fuzzy rule for obtaining the corrugated paper conveying speed is used to obtain the premise confidence of the corrugated paper conveying speed adjustment.

[0038] 7) According to the intelligent paperboard production temperature control method described in 1), the conveying speed of the corrugated base paper after passing through the steam press to form corrugated paper is taken as the adjustment object and the number of consecutive adjustments is determined. If the number of adjustments exceeds a threshold, the steam conveying volume of the steam press is taken as the adjustment object; otherwise, the adjustment object is determined based on the reliability of the corrugated paper conveying speed. The method includes the following steps:

[0039] Step S1: Take the minimum conveying speed of the corrugated base paper after passing through the steam press as the adjustment object, and take the temperature and moisture content of the corrugated paper as the guiding adjustment. Adjust the conveying speed of the corrugated paper from the minimum value to the maximum value until the temperature and moisture content of the corrugated paper are satisfied.

[0040] Step S2: In step S1, the continuous adjustment of the corrugated paper conveying speed is obtained by obtaining the number of adjustment times. When the number of adjustment times is greater than the threshold, the adjustment of the corrugated paper conveying speed will be stopped. The steam conveying amount of the steam press plate is used as the adjustment object. The steam conveying amount of the steam press plate is adjusted with the temperature and moisture content of the corrugated paper as the guide values. The steam conveying amount of the steam press plate is adjusted to meet the temperature and moisture content of the corrugated paper.

[0041] Step S3: Based on the fact that the number of adjustments is less than the threshold in step S2, the corrugated paper conveying speed is determined as the adjustment object, and the corrugated paper conveying speed is continuously adjusted to meet the temperature and moisture content values ​​of the corrugated paper.

[0042] 8) According to the intelligent paperboard temperature control method described in 1), the output of the adjustment object in the fuzzy rule of the function is calculated, and the adjustment value is obtained by inverse fuzzification. The adjustment value is then used to adjust the adjustment object. Specifically:

[0043] If the reliability of the premise for adjusting the steam delivery rate is greater than the reliability of the premise for adjusting the corrugated paper conveying speed, then the steam delivery rate shall be the object of adjustment.

[0044] If the reliability of the premise for adjusting the steam delivery rate is less than that of adjusting the corrugated paper delivery speed, then the corrugated paper delivery speed shall be the object of adjustment.

[0045] If the reliability of the premise for adjusting the steam delivery rate is equal to the reliability of the premise for adjusting the corrugated paper delivery speed, then obtain the maximum and minimum allowable values ​​for the corrugated paper delivery speed and the maximum and minimum allowable values ​​for the steam delivery rate. Based on the maximum and minimum allowable values ​​for the corrugated paper delivery speed, obtain the median value for the corrugated paper delivery speed. Based on the median value for the maximum and minimum allowable values ​​for the steam delivery rate, obtain the relative deviation between the current steam delivery rate and the median value for the steam delivery rate, as well as the relative deviation between the current corrugated paper delivery speed and the median value for the corrugated paper delivery speed. The one with the smallest relative deviation is taken as the adjustment object.

[0046] 9) According to the intelligent paperboard production temperature control method described in 8), wherein the relative deviation between the current steam delivery rate and the median value of the current steam delivery rate, and the relative deviation between the current corrugated paper conveying speed and the median value of the current corrugated paper conveying speed are obtained, and the one with the smallest relative deviation is taken as the adjustment object, specifically:

[0047] Calculate the absolute difference between the current steam delivery rate and the median value of the steam delivery rate, and calculate the absolute difference between the maximum and minimum allowable values ​​of the steam delivery rate to obtain the steam delivery rate adjustment range. The ratio of the absolute difference to the steam delivery rate adjustment range is used as the relative deviation of the steam delivery rate.

[0048] Calculate the absolute difference between the current corrugated paper conveying speed and the median value of the corrugated paper conveying speed, and calculate the absolute difference between the maximum and minimum allowable values ​​of the corrugated paper conveying speed to obtain the adjustment range of the corrugated paper conveying speed. The ratio of the absolute difference to the adjustment range of the corrugated paper conveying speed is taken as the relative deviation of the corrugated paper conveying speed.

[0049] 10) According to the intelligent paperboard temperature control method described in 9), the method further includes taking the one with the smallest relative deviation as the adjustment object, and taking the corrugated paper conveying speed as the adjustment object if the relative deviations are the same.

[0050] Compared with the prior art, the present invention also has the following technical effects:

[0051] In addition to controlling the steam output of the steam press, this invention also uses the corrugated paper conveying speed after the corrugated base paper passes through the steam press as the adjustment target. When the number of times the corrugated paper conveying speed is adjusted exceeds a threshold, the steam delivery volume of the steam press becomes the adjustment target. Otherwise, the adjustment target is determined based on the reliability of the premise of the corrugated paper conveying speed. The higher the reliability of the premise, the more the premise conditions of the rule match the current input, and the more accurate the adjustment value is. This combines the corrugated environment temperature and the corrugated paper's own temperature during the high-temperature steam processing of the corrugated base paper into corrugated paper, and monitors it in real time to ensure that the quantitative steam delivery meets the temperature required for corrugated base paper production, reducing moisture loss from the corrugated base paper, thus ensuring the bonding force between the layers of corrugated base paper, reducing the phenomenon of corrugated paper becoming brittle, and maintaining the necessary ring crush and bursting strength of the corrugated paper. Attached Figure Description

[0052] Figure 1 This is a flowchart of an intelligent temperature control method for producing cardboard according to the present invention. Detailed Implementation

[0053] The following detailed description illustrates the specific implementation method:

[0054] See the example. Figure 1 As shown in this embodiment, an intelligent temperature control method for paperboard production includes the following steps:

[0055] The physical index of moisture content of corrugated base paper before production is obtained, and the temperature and humidity information of corrugated base paper production on the same day are collected simultaneously. Based on the physical index of moisture content of corrugated base paper before production, and combined with the temperature and humidity information of production on the same day, the initial steam output of the steam press is obtained.

[0056] The initial steam output of the steam press plate is used to heat the corrugated base paper to form corrugated paper. The temperature and moisture content of the corrugated paper are collected. A fuzzy rule function is constructed based on the temperature and moisture content of the corrugated paper. The premise confidence of each rule in the fuzzy rule function is obtained based on the temperature and moisture content. The premise confidence of the steam output of the steam press plate is obtained by using the premise confidence of the rule.

[0057] The speed at which corrugated base paper is conveyed through a steam press to form corrugated paper is taken as the adjustment object, and the number of consecutive adjustments is determined. If the number of adjustments exceeds a threshold, the steam conveying capacity of the steam press is taken as the adjustment object; otherwise, the adjustment object is determined based on the reliability of the corrugated paper conveying speed. The output of the adjustment object in the function fuzzy rule is calculated, and the adjustment value is obtained by inverse fuzzification. The adjustment value is then used to adjust the adjustment object.

[0058] In this embodiment, the steam output of the steam pressure plate and the conveying speed of corrugated paper production are controlled. When the invention sets the initial state, it obtains the physical index of moisture content of corrugated base paper before production, and simultaneously collects the temperature and humidity information of corrugated base paper production on the same day. Furthermore, by combining the physical index of moisture content of corrugated base paper before production with the temperature and humidity information of corrugated base paper production on the same day, the steam output of the steam pressure plate is initially determined.

[0059] During operation, the steam output of the initial steam pressure plate is fed into the corrugating machine, and the corrugated base paper is heated by steam through the steam pressure plate of the corrugating machine to obtain corrugated paper. The temperature and moisture content of the corrugated paper are collected from the output corrugated paper. The temperature and moisture content of the corrugated paper collected multiple times are used to construct a fuzzy rule function, and the temperature and moisture content are used as the premise confidence of each rule in the fuzzy rule function.

[0060] In use, this invention not only controls the steam output of the steam press, but also adjusts the corrugated paper conveying speed as the regulating object based on the conveying speed of the corrugated paper after passing through the steam press. When the number of times the corrugated paper conveying speed is adjusted exceeds a threshold, the steam conveying volume of the steam press is adjusted. Otherwise, the adjustment object is determined based on the reliability of the premise of the corrugated paper conveying speed. The higher the reliability of the premise, the more the premise of the rule matches the current input, and the more accurate the adjustment value is. This combines the corrugated environment temperature and the corrugated paper's own temperature during the high-temperature steam processing of the corrugated paper to ensure that the quantitative steam delivery meets the temperature required for corrugated paper production, reducing the phenomenon of moisture loss in the corrugated paper.

[0061] For example, if the temperature is high and the moisture content is high, the steam output will be increased; similarly, fuzzy control rules are also constructed for the corrugated paper conveying speed, for example, if the temperature is low and the moisture content is low, the corrugated paper conveying speed will be decreased. It should be noted that there are multiple fuzzy rules for both the steam output and the corrugated paper conveying speed.

[0062] Temperature has a membership function, and similarly, moisture content also has a membership function. Substituting the currently collected temperature and moisture content into their respective membership functions yields the membership degree. Since the membership function is a multi-interval function, and there may be overlap between multiple intervals, the resulting membership degree may be more than one. For example, with a temperature of 115 degrees, substituting into the temperature membership function yields a membership degree of 0.12 for moderate temperatures and 0.78 for high temperatures; similarly, substituting into the moisture content function yields more than one membership degree. Combining the membership degrees of different temperatures and different moisture contents determines the fuzzy rules for activation. For example, substituting temperature into the temperature membership function and moisture content into the moisture content membership function yields a membership degree of 0.6 for temperature and 0.2 for high moisture content. Therefore, the rule of increasing steam output is activated when the temperature (0.6) and moisture content (0.2) membership degrees are both 0. The reliability of this rule is based on the premise of medium temperature (0.6) and high water content (0.2).

[0063] Meanwhile, the corrugated paper conveying speed was controlled at 110-130 m / min, corresponding to a steam delivery volume of 10 kg. In this embodiment, during the first morning production run, the ambient humidity was approximately 78%, and through the above adjustments, the edge pressure data was measured at 470-500 N / m. During the second afternoon production run, the ambient humidity was approximately 41%, and through the above adjustments, the edge pressure data was measured at 530 N / m.

[0064] In addition, in this embodiment, the physical index of moisture content of corrugated base paper before production is obtained, and the temperature and humidity information of corrugated base paper production on the same day are collected simultaneously. Based on the physical index of moisture content of corrugated base paper before production, and combined with the temperature and humidity information of production on the same day, the initial steam output of the steam press is obtained, including the following steps:

[0065] Step S1: Multiple sets of temperature and humidity sensors are installed in the corrugated paper production line, and all temperature and humidity sensors are monitored online.

[0066] Step S2: The humidity sensor set in the corrugated base paper storage area is used to detect the physical index of moisture content of corrugated base paper before production. When the physical index of moisture content of corrugated base paper before production meets the standard in the corrugated production line, the corrugated base paper in the storage area is started to be used. Otherwise, the production of corrugated base paper that does not meet the standard is stopped and labeled as unqualified.

[0067] Step S3: By setting temperature and humidity sensors in the corrugated production line environment, the temperature sensor collects the temperature information of the corrugated base paper produced on the same day, and the humidity sensor collects the humidity information of the corrugated base paper produced on the same day.

[0068] Step S4: Based on step S3, the steam output of the initial steam press is obtained using the temperature and humidity information of the day's production. The corrugated base paper in the storage area is started and corrugated by the steam press. The steam output of the initial steam press is used to achieve the heating temperature of the corrugated base paper. The temperature and moisture content are precisely controlled during the steam output process.

[0069] Furthermore, in this embodiment, the precise control of temperature and moisture content during the steam output delivery process specifically includes: real-time monitoring of temperature and moisture content during the steam output delivery process;

[0070] Based on the temperature changes, the steam output is adjusted using the first calculation formula.

[0071] The steam output is adjusted based on the change in moisture content using the second calculation formula.

[0072] The first calculation formula is:

[0073] YT = k1 × (PT - YP) × DT

[0074] Where YT is the steam output, k1 is the first adjustment coefficient, PT is the average temperature, YP is the preset average temperature, and DT is the current steam output temperature;

[0075] The second calculation formula is:

[0076] YT = k2 × (PY - YY) × DT

[0077] Where k2 is the second adjustment coefficient, PY is the average moisture content, and YY is the preset average moisture content.

[0078] Meanwhile, in this embodiment, the initial steam output of the steam pressure plate is used to heat the corrugated base paper to form corrugated paper, and the temperature and moisture content of the corrugated paper itself are collected. A fuzzy rule function is constructed using the temperature and moisture content of the corrugated paper itself, including the following steps:

[0079] Step S1: The corrugated base paper in the storage area is started and corrugated by a steam press to form corrugated paper. The initial steam output of the steam press is used to heat the corrugated base paper to the desired temperature.

[0080] Step S2: A temperature sensor for detecting the temperature information of the corrugated paper and a humidity sensor for detecting the moisture content of the corrugated paper are set in the corrugated paper conveying direction. The temperature information of the corrugated paper is collected by the temperature sensor and the moisture content of the corrugated paper is collected by the humidity sensor.

[0081] Step S3: Substitute the temperature information of the corrugated paper itself into the temperature membership function to obtain the temperature membership degree. At the same time, substitute the moisture content of the corrugated paper itself into the moisture content membership function to obtain the moisture content membership degree. Arrange the temperature membership degree from the minimum to the maximum value to obtain the temperature function fuzzy rule, and arrange the moisture content membership degree from the minimum to the maximum value to obtain the moisture content function fuzzy rule.

[0082] Furthermore, in this embodiment, the premise confidence level of each rule in the fuzzy rule of the function is obtained based on temperature information and moisture content. The premise confidence level of the rules is then used to obtain the premise confidence level of the steam output of the steam pressure plate, specifically:

[0083] Substitute the temperature information and water content into the membership functions of temperature and water content respectively to obtain the membership degree;

[0084] The minimum value of the membership degree of temperature and the membership degree of moisture content in the fuzzy control rule is used as the premise confidence of the rule.

[0085] Simultaneously, the premise confidence level of the steam output of the steam pressure plate is obtained by using the premise confidence level of the rule, specifically as follows:

[0086] The sum of the premise confidence of each fuzzy rule for obtaining the steam output of the steam pressure plate is used to obtain the premise confidence of steam output regulation;

[0087] The sum of the premise confidence of each fuzzy rule for obtaining the corrugated paper conveying speed is used to obtain the premise confidence of the corrugated paper conveying speed adjustment.

[0088] The process involves obtaining the conveying speed of the corrugated base paper after passing through a steam press to form corrugated paper, and adjusting it continuously for a certain number of times. If the number of adjustments exceeds a threshold, the steam conveying capacity of the steam press is used as the adjustment target; otherwise, the conveying speed of the corrugated paper is determined as the adjustment target based on the reliability of the premise. This includes the following steps:

[0089] Step S1: Take the minimum conveying speed of the corrugated base paper after passing through the steam press as the adjustment object, and take the temperature and moisture content of the corrugated paper as the guiding adjustment. Adjust the conveying speed of the corrugated paper from the minimum value to the maximum value until the temperature and moisture content of the corrugated paper are satisfied.

[0090] Step S2: In step S1, the continuous adjustment of the corrugated paper conveying speed is obtained by obtaining the number of adjustment times. When the number of adjustment times is greater than the threshold, the adjustment of the corrugated paper conveying speed will be stopped. The steam conveying amount of the steam press plate is used as the adjustment object. The steam conveying amount of the steam press plate is adjusted with the temperature and moisture content of the corrugated paper as the guide values. The steam conveying amount of the steam press plate is adjusted to meet the temperature and moisture content of the corrugated paper.

[0091] Step S3: Based on the fact that the number of adjustments is less than the threshold in step S2, the corrugated paper conveying speed is determined as the adjustment object, and the corrugated paper conveying speed is continuously adjusted to meet the temperature and moisture content values ​​of the corrugated paper.

[0092] Furthermore, in this embodiment, the output of the adjustment object under the function fuzzy rule is calculated, and inverse fuzzing is performed to obtain the adjustment value. The adjustment value is then used to adjust the adjustment object, specifically as follows:

[0093] If the reliability of the premise for adjusting the steam delivery rate is greater than the reliability of the premise for adjusting the corrugated paper conveying speed, then the steam delivery rate shall be the object of adjustment.

[0094] If the reliability of the premise for adjusting the steam delivery rate is less than that of adjusting the corrugated paper delivery speed, then the corrugated paper delivery speed shall be the object of adjustment.

[0095] If the reliability of the premise for adjusting the steam delivery rate is equal to the reliability of the premise for adjusting the corrugated paper delivery speed, then obtain the maximum and minimum allowable values ​​for the corrugated paper delivery speed and the maximum and minimum allowable values ​​for the steam delivery rate. Based on the maximum and minimum allowable values ​​for the corrugated paper delivery speed, obtain the median value for the corrugated paper delivery speed. Based on the median value for the maximum and minimum allowable values ​​for the steam delivery rate, obtain the relative deviation between the current steam delivery rate and the median value for the steam delivery rate, as well as the relative deviation between the current corrugated paper delivery speed and the median value for the corrugated paper delivery speed. The one with the smallest relative deviation is taken as the adjustment target.

[0096] Furthermore, the relative deviation between the current steam delivery rate and its median value, as well as the relative deviation between the current corrugated paper conveying speed and its median value, are obtained. The one with the smallest relative deviation is selected for adjustment. Specifically:

[0097] Calculate the absolute difference between the current steam delivery rate and the median value of the steam delivery rate, and calculate the absolute difference between the maximum and minimum allowable values ​​of the steam delivery rate to obtain the steam delivery rate adjustment range. The ratio of the absolute difference to the steam delivery rate adjustment range is used as the relative deviation of the steam delivery rate.

[0098] Calculate the absolute difference between the current corrugated paper conveying speed and the median value of the current corrugated paper conveying speed, and calculate the absolute difference between the maximum and minimum allowable values ​​of the corrugated paper conveying speed to obtain the adjustment range of the corrugated paper conveying speed. The ratio of the absolute difference to the adjustment range of the corrugated paper conveying speed is taken as the relative deviation of the corrugated paper conveying speed. Simultaneously, the speed with the smallest relative deviation is selected as the adjustment target. This also includes the option that if the relative deviations are the same, the corrugated paper conveying speed is selected as the adjustment target.

[0099] In addition to controlling the steam output of the steam press, this embodiment also uses the corrugated paper conveying speed after the corrugated base paper passes through the steam press as the adjustment target. When the number of times the corrugated paper conveying speed is adjusted exceeds a threshold, the steam delivery volume of the steam press is used as the adjustment target. Otherwise, the adjustment target is determined based on the reliability of the premise of the corrugated paper conveying speed. The higher the reliability of the premise, the more the premise conditions of the rule match the current input, and the more accurate the adjustment value is. This combines the corrugated environment temperature and the corrugated paper temperature during the process of the corrugated base paper being processed into corrugated paper by high-temperature steam, and monitors in real time to ensure that the quantitative steam delivery meets the temperature required for corrugated base paper production, reducing the phenomenon of moisture loss in the corrugated base paper, thereby ensuring the bonding force between the layers of corrugated base paper, reducing the phenomenon of corrugated paper becoming brittle, and maintaining the ring crush and bursting strength of the corrugated paper.

[0100] The above are merely embodiments of this solution. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this solution. These modifications and improvements should also be considered within the scope of protection of this solution, and will not affect the effectiveness of the implementation of this solution or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for intelligent temperature control in the production of cardboard, characterized in that, include: The physical index of moisture content of corrugated base paper before production is obtained, and the temperature and humidity information of corrugated base paper production on the same day are collected simultaneously. Based on the physical index of moisture content of corrugated base paper before production, and combined with the temperature and humidity information of production on the same day, the initial steam output of the steam press is obtained. The corrugated base paper is heated by steam to form corrugated paper using the initial steam output of the steam press plate. The temperature and moisture content of the corrugated paper are collected. A fuzzy rule function is constructed using the temperature and moisture content of the corrugated paper. The premise confidence of each rule in the fuzzy rule function is obtained based on the temperature and moisture content. The premise confidence of the steam output of the steam press plate is obtained using the premise confidence of the rule function. The speed at which corrugated base paper is conveyed through a steam press to form corrugated paper is taken as the adjustment object, and the number of consecutive adjustments is determined. If the number of adjustments exceeds a threshold, the steam conveying capacity of the steam press is taken as the adjustment object; otherwise, the adjustment object is determined based on the reliability of the corrugated paper conveying speed. The output of the adjustment object in the function fuzzy rule is calculated, and the adjustment value is obtained by reverse fuzzification. The adjustment value is then used to adjust the adjustment object.

2. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The process involves obtaining the physical index of moisture content of corrugated base paper before production, simultaneously collecting temperature and humidity information for the day of production, and, based on the physical index of moisture content before production and the combined temperature and humidity information, initially determining the steam output of the steam press plate. This includes the following steps: Step S1: Multiple sets of temperature and humidity sensors are installed in the corrugated paper production line, and all temperature and humidity sensors are monitored online. Step S2: The humidity sensor set in the corrugated base paper storage area is used to detect the physical index of moisture content of corrugated base paper before production. When the physical index of moisture content of corrugated base paper before production meets the standard in the corrugated production line, the corrugated base paper in the storage area is started to be used. Otherwise, the production of corrugated base paper that does not meet the standard is stopped and labeled as unqualified. Step S3: By setting temperature and humidity sensors in the corrugated production line environment, the temperature sensor collects the temperature information of the corrugated base paper produced on the same day, and the humidity sensor collects the humidity information of the corrugated base paper produced on the same day. Step S4: Based on step S3, the steam output of the initial steam press is obtained using the temperature and humidity information of the day's production. The corrugated base paper in the storage area is started and corrugated by the steam press. The steam output of the initial steam press is used to achieve the heating temperature of the corrugated base paper. The temperature and moisture content are precisely controlled during the steam output process.

3. The intelligent temperature control method for paperboard production according to claim 2, characterized in that: The precise control of temperature and moisture content during the steam output transmission process specifically includes: real-time monitoring of temperature and moisture content during the steam output transmission process; Based on changes in temperature information, the steam output is adjusted using the first calculation formula. The steam output is adjusted according to the change in moisture content using the second calculation formula. The first calculation formula is: YT = k1 × (PT - YP) × DT Where YT is the steam output, k1 is the first adjustment coefficient, PT is the average temperature, YP is the preset average temperature, and DT is the current steam output temperature; The second calculation formula is: YT = k2 × (PY - YY) × DT Where k2 is the second adjustment coefficient, PY is the average moisture content, and YY is the preset average moisture content.

4. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The process involves using the initial steam output of the steam press to heat the corrugated base paper and form corrugated paper, and collecting the temperature and moisture content of the corrugated paper itself. A fuzzy rule function is then constructed using this temperature and moisture content, including the following steps: Step S1: The corrugated base paper in the storage area is started and corrugated by the steam press to form corrugated paper. The steam output of the initial steam press is used to heat the corrugated base paper to the desired temperature. Step S2: A temperature sensor for detecting the temperature information of the corrugated paper and a humidity sensor for detecting the moisture content of the corrugated paper are set in the corrugated paper conveying direction. The temperature information of the corrugated paper is collected by the temperature sensor and the moisture content of the corrugated paper is collected by the humidity sensor. Step S3: Substitute the temperature information of the corrugated paper itself into the temperature membership function to obtain the temperature membership degree. At the same time, substitute the moisture content of the corrugated paper itself into the moisture content membership function to obtain the moisture content membership degree. Arrange the temperature membership degree from the minimum to the maximum value to obtain the temperature function fuzzy rule, and arrange the moisture content membership degree from the minimum to the maximum value to obtain the moisture content function fuzzy rule.

5. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The premise confidence level of each rule in the fuzzy rule function is obtained based on the temperature information and moisture content. The premise confidence level of the rules is then used to obtain the premise confidence level of the steam output of the steam pressure plate. Specifically: Substitute the temperature information and water content into the membership functions of temperature and water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of moisture content in the fuzzy control rule is used as the premise confidence of the rule.

6. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The premise confidence level for obtaining the steam output of the steam pressure plate using the premise confidence level of the rule is specifically as follows: The sum of the premise confidence of each fuzzy rule for obtaining the steam output of the steam pressure plate is used to obtain the premise confidence of steam output regulation; The sum of the premise confidence of each fuzzy rule for obtaining the corrugated paper conveying speed is used to obtain the premise confidence of the corrugated paper conveying speed adjustment.

7. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The process involves obtaining the conveying speed of the corrugated base paper after passing through a steam press to form corrugated paper as the adjustment target, and continuously adjusting it a certain number of times. If the number of adjustments exceeds a threshold, the steam conveying capacity of the steam press is used as the adjustment target; otherwise, the adjustment target is determined based on the reliability of the corrugated paper conveying speed. This includes the following steps: Step S1: Take the minimum conveying speed of the corrugated base paper after passing through the steam press as the adjustment object, and take the temperature and moisture content of the corrugated paper as the guiding adjustment. Adjust the conveying speed of the corrugated paper from the minimum value to the maximum value until the temperature and moisture content of the corrugated paper are satisfied. Step S2: In step S1, the continuous adjustment of the corrugated paper conveying speed is obtained by obtaining the number of adjustment times. When the number of adjustment times is greater than the threshold, the adjustment of the corrugated paper conveying speed will be stopped. The steam conveying amount of the steam press plate is used as the adjustment object. The steam conveying amount of the steam press plate is adjusted with the temperature and moisture content of the corrugated paper as the guide values. The steam conveying amount of the steam press plate is adjusted to meet the temperature and moisture content of the corrugated paper. Step S3: Based on the fact that the number of adjustments is less than the threshold in step S2, the corrugated paper conveying speed is determined as the adjustment object, and the corrugated paper conveying speed is continuously adjusted to meet the temperature and moisture content values ​​of the corrugated paper.

8. The intelligent temperature control method for paperboard production according to claim 1, characterized in that: The process involves calculating the output of the fuzzy rule for the object to be regulated, performing inverse fuzzing to obtain the regulated value, and then using this regulated value to adjust the object. Specifically: If the reliability of the premise for adjusting the steam delivery rate is greater than the reliability of the premise for adjusting the corrugated paper conveying speed, then the steam delivery rate shall be the object of adjustment. If the reliability of the premise for adjusting the steam delivery rate is less than that of adjusting the corrugated paper delivery speed, then the corrugated paper delivery speed shall be the object of adjustment. If the reliability of the premise for adjusting the steam delivery rate is equal to the reliability of the premise for adjusting the corrugated paper delivery speed, then obtain the maximum and minimum allowable values ​​for the corrugated paper delivery speed and the maximum and minimum allowable values ​​for the steam delivery rate. Based on the maximum and minimum allowable values ​​for the corrugated paper delivery speed, obtain the median value for the corrugated paper delivery speed. Based on the median value for the maximum and minimum allowable values ​​for the steam delivery rate, obtain the relative deviation between the current steam delivery rate and the median value for the steam delivery rate, as well as the relative deviation between the current corrugated paper delivery speed and the median value for the corrugated paper delivery speed. The one with the smallest relative deviation is taken as the adjustment target.

9. The intelligent temperature control method for paperboard production according to claim 8, characterized in that: The relative deviation between the current steam delivery rate and the median value of the current steam delivery rate, and the relative deviation between the current corrugated paper conveying speed and the median value of the current corrugated paper conveying speed, are used as the adjustment target, specifically: Calculate the absolute difference between the current steam delivery rate and the median value of the steam delivery rate, and calculate the absolute difference between the maximum and minimum allowable values ​​of the steam delivery rate to obtain the steam delivery rate adjustment range. The ratio of the absolute difference to the steam delivery rate adjustment range is used as the relative deviation of the steam delivery rate. Calculate the absolute difference between the current corrugated paper conveying speed and the median value of the corrugated paper conveying speed, and calculate the absolute difference between the maximum and minimum allowable values ​​of the corrugated paper conveying speed to obtain the adjustment range of the corrugated paper conveying speed. The ratio of the absolute difference to the adjustment range of the corrugated paper conveying speed is taken as the relative deviation of the corrugated paper conveying speed.

10. The intelligent temperature control method for paperboard production according to claim 9, characterized in that: The adjustment target is the one with the smallest relative deviation. If the relative deviations are the same, the corrugated paper conveying speed is the adjustment target.

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