A temperature control method and system for corrugated paper production process

Abstract

The present invention relates to a temperature control method and system for a corrugated paper production process, comprising the steps of obtaining the temperature and moisture content of the corrugated paper after the corrugated paper passes through a preheating roller, constructing a membership function and a fuzzy control rule, obtaining the premise credibility of each rule in the fuzzy control rule based on the temperature and moisture content, and obtaining the premise credibility of air intake adjustment and the premise credibility of preheating roller wrap angle adjustment using the premise credibility of the rule; obtaining the number of times the preheating roller wrap angle is used as an adjustment object and adjusted continuously in one direction, and if the number is greater than a threshold, taking the air intake as the adjustment object; otherwise, determining the adjustment object based on the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment; calculating the output of the adjustment object in the fuzzy system, performing defuzzification to obtain an adjustment value, and using the adjustment value to adjust the adjustment object.

Description

Technical Field

[0001] The present invention relates to the field of fuzzy control, and in particular to a temperature control method and system for a corrugated paper production process. Background Art

[0002] Corrugated paper is made of a corrugated core bonded to two smooth face papers. It boasts lightweight, high strength, and excellent resistance to compression, shock, and cushioning, effectively protecting items from damage during transportation, storage, and handling. It is a widely used packaging method across nearly every industry. The production process for corrugated cardboard is a complex, continuous process involving multiple steps. Preheating the paper as it passes through preheating rollers is crucial for preparing it for subsequent processing steps, such as bonding with the core paper. The preheating rollers use steam to conduct heat, which can affect the paper's flexibility and adhesion. However, factors such as the initial moisture content and quantity of the corrugated cardboard, as well as ambient temperature and humidity, can affect the drying process, leading to temperature fluctuations in the preheating rollers. Improper temperatures can even cause quality issues such as deformation and cracking, seriously impacting production efficiency and product quality. There are two main ways to adjust temperature: one is to adjust the air intake of the preheating roller, and the other is to adjust the wrap angle between the corrugated paper and the preheating roller. Both methods have their advantages and disadvantages. The air intake adjustment temperature range is larger, but the hysteresis is relatively large. While the wrap angle adjustment is flexible and fast, the adjustment range is limited. Therefore, how to maximize the advantages of both methods and minimize the impact of their disadvantages is of great significance to the temperature control of the corrugated paper production process. Summary of the Invention

[0003] In order to solve the above problems, in a first aspect, a method for controlling temperature in a corrugated paper production process is provided, the method comprising:

[0004] Obtaining the temperature and moisture content of the corrugated paper after it passes through the preheating roller, constructing a membership function and a fuzzy control rule, obtaining the premise credibility of each rule in the fuzzy control rule based on the temperature and moisture content, and using the premise credibility of the rule to obtain the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment;

[0005] Obtain the number of times the preheating roller wrap angle is continuously adjusted in one direction as the adjustment target. If the number is greater than a threshold, the air intake volume is used as the adjustment target. Otherwise, the adjustment target is determined based on the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment.

[0006] The output of the regulated object in the fuzzy system is calculated and defuzzified to obtain a regulation value, which is used to regulate the regulated object.

[0007] In an optional embodiment, the premise credibility of each rule in the fuzzy control rule is obtained based on the temperature and water content, specifically:

[0008] Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership;

[0009] The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rule is taken as the premise credibility of the rule.

[0010] In an optional embodiment, the premise credibility of the rule is used to obtain the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0011] The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the intake air volume adjustment premise credibility;

[0012] The premise credibility of the preheating roller wrap angle adjustment is obtained by obtaining the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle.

[0013] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0014] The maximum value of the premise credibility of the air intake adjustment and the premise credibility of the preheating roller angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller angle is taken as the adjustment object.

[0015] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0016] If the premise credibility of air intake adjustment is greater than that of preheating roller wrap angle adjustment, the air intake will be taken as the adjustment object;

[0017] If the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object;

[0018] If the premise credibility of the air intake adjustment is equal to the premise credibility of the preheating roller angle adjustment, then the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake are obtained, and the intermediate value of the preheating roller angle is obtained based on the maximum and minimum allowable values ​​of the preheating roller angle. Based on the intermediate value of the maximum and minimum allowable values ​​of the air intake, the relative deviation degree between the current air intake and the intermediate value of the air intake, as well as the relative deviation degree between the current preheating roller angle and the intermediate value of the preheating roller angle are obtained, and the one with the smallest relative deviation degree is taken as the adjustment object.

[0019] In an optional embodiment, the relative deviation between the current air intake volume and the intermediate value of the air intake volume and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained as follows:

[0020] Calculate the absolute difference between the current intake volume and the middle value of the intake volume, and calculate the absolute difference between the maximum and minimum allowable intake volume to obtain the intake volume adjustment range. The ratio of the absolute difference to the intake volume adjustment range is used as the relative deviation degree of the intake volume.

[0021] Calculate the absolute difference between the current preheating roller and the middle value of the preheating roller, and calculate the absolute difference between the maximum and minimum values ​​allowed by the preheating roller to obtain the adjustment range of the preheating roller. The ratio of the absolute difference and the adjustment range of the preheating roller angle is used as the relative deviation degree of the preheating roller angle.

[0022] In an optional embodiment, the method of selecting the one with the smallest relative deviation as the adjustment object further includes:

[0023] If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0024] In a second aspect, a temperature control system for a corrugated paper production process is provided, the system comprising:

[0025] A premise credibility calculation module is used to obtain the temperature and moisture content of the corrugated paper after it passes through the preheating roller, construct a membership function and a fuzzy control rule, obtain the premise credibility of each rule in the fuzzy control rule based on the temperature and moisture content, and use the premise credibility of the rule to obtain the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment;

[0026] an adjustment object determination module, configured to obtain the number of times the preheating roller wrap angle is continuously adjusted in one direction as the adjustment object; if the number is greater than a threshold, the air intake volume is used as the adjustment object; otherwise, the adjustment object is determined based on the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment;

[0027] The execution module is used to calculate the output of the regulation object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulation object.

[0028] In an optional embodiment, the premise credibility of each rule in the fuzzy control rule is obtained based on the temperature and water content, specifically:

[0029] Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership;

[0030] The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rule is taken as the premise credibility of the rule.

[0031] In an optional embodiment, the premise credibility of the rule is used to obtain the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0032] The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the intake air volume adjustment premise credibility;

[0033] The premise credibility of the preheating roller wrap angle adjustment is obtained by obtaining the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle.

[0034] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0035] The maximum value of the premise credibility of the air intake adjustment and the premise credibility of the preheating roller angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller angle is taken as the adjustment object.

[0036] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0037] If the premise credibility of air intake adjustment is greater than that of preheating roller wrap angle adjustment, the air intake will be taken as the adjustment object;

[0038] If the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object;

[0039] If the premise credibility of the air intake adjustment is equal to the premise credibility of the preheating roller angle adjustment, then the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake are obtained, and the intermediate value of the preheating roller angle is obtained based on the maximum and minimum allowable values ​​of the preheating roller angle. Based on the intermediate value of the maximum and minimum allowable values ​​of the air intake, the relative deviation degree between the current air intake and the intermediate value of the air intake, as well as the relative deviation degree between the current preheating roller angle and the intermediate value of the preheating roller angle are obtained, and the one with the smallest relative deviation degree is taken as the adjustment object.

[0040] In an optional embodiment, the relative deviation between the current air intake volume and the intermediate value of the air intake volume and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained as follows:

[0041] Calculate the absolute difference between the current intake volume and the middle value of the intake volume, and calculate the absolute difference between the maximum and minimum allowable intake volume to obtain the intake volume adjustment range. The ratio of the absolute difference to the intake volume adjustment range is used as the relative deviation degree of the intake volume.

[0042] Calculate the absolute difference between the current preheating roller and the middle value of the preheating roller, and calculate the absolute difference between the maximum and minimum values ​​allowed by the preheating roller to obtain the adjustment range of the preheating roller. The ratio of the absolute difference and the adjustment range of the preheating roller angle is used as the relative deviation degree of the preheating roller angle.

[0043] In an optional embodiment, the method of selecting the one with the smallest relative deviation as the adjustment object further includes:

[0044] If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0045] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed in a computer, the computer is caused to execute the method provided in any one of the embodiments of the first aspect.

[0046] In a fourth aspect, a computing device is provided, comprising a memory and a processor, wherein the memory stores executable code, and when the processor executes the executable code, the method provided in any one of the embodiments of the first aspect is implemented.

[0047] In the corrugated paper production process, temperature is typically regulated using wrap angle and air intake. While wrap angle is easy to adjust, its adjustment range is limited. Air intake has a wide adjustment range but exhibits significant hysteresis. The present invention determines the number of times the preheating roller wrap angle is adjusted in one direction. If this number exceeds a threshold, air intake is adjusted. Otherwise, the maximum confidence level between the air intake adjustment and the preheating roller wrap angle is used as the adjustment target. The higher the confidence level, the more consistent the rule's premise is with the current input, resulting in a more accurate adjustment value. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a flow chart of Example 1;

[0049] Figure 2 is a schematic diagram of a preheating roller;

[0050] Figure 3 is the membership function diagram of temperature;

[0051] Figure 4 is the membership degree when the temperature is 125 degrees;

[0052] Figure 5 This is a structural diagram of Example 2. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limiting this application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] In the following description, the terms "first\second" are only used to distinguish similar objects and do not represent a specific order for the objects. It can be understood that "first\second" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein are for the purpose of describing the embodiments of this application only and are not intended to limit this application.

[0056] Figure 1 A flow chart showing a first embodiment of the present invention is shown in FIG. Figure 1 As shown, the temperature control methods for the corrugated paper production process include:

[0057] S10, obtaining the temperature and moisture content of the corrugated paper after the corrugated paper passes through the preheating roller, constructing a membership function and a fuzzy control rule, obtaining a premise credibility of each rule in the fuzzy control rule based on the temperature and moisture content, and using the premise credibility of the rule to obtain a premise credibility of air intake adjustment and a premise credibility of preheating roller wrap angle adjustment;

[0058] Among them, the preheating roller is a device used to preheat the paper during the production of corrugated paper. Its main function is to adjust the temperature and moisture content of the corrugated paper to achieve better bonding effect. There are two ways to adjust the temperature. One is to adjust the contact area between the corrugated paper and the preheating roller surface, which is mainly achieved by adjusting the wrap angle, such as Figure 2 As shown, another method is to adjust the air intake of the preheating roller. Since the preheating roller transfers heat through steam heating, the temperature of the preheating roller can be controlled by adjusting the air intake.

[0059] After the corrugated paper passes through the preheating rollers, its temperature and moisture content are measured. Membership functions for temperature and moisture content are constructed, and fuzzy control rules are established for the air intake. For example, if both the temperature and moisture content are high, the air intake is increased. Similarly, fuzzy control rules are established for the preheating roller wrap angle. For example, if both the temperature and moisture content are low, the wrap angle is decreased. It should be noted that there are multiple fuzzy control rules for both the air intake and wrap angle.

[0060] Temperature has a membership function such as Figure 3 As shown in the figure, water content also has a membership function. Substitute the currently collected temperature and water content into the corresponding membership function to obtain the membership degree. Since the membership function is a multi-interval function and there will be overlaps between multiple intervals, the obtained membership degree may be more than one. For example, if the temperature is 115 degrees, the membership degree of the medium temperature is 0.12 and the membership degree of the high temperature is 0.78 when substituting it into the temperature membership function. Figure 4 As shown, similarly, the membership obtained by substituting the water content function is not just one. The membership of different temperatures and the membership of different water contents are combined to determine the activated fuzzy control rule. For example, the temperature is substituted into the temperature membership function, and the water content is substituted into the water content membership function. The membership of the medium temperature is 0.6, and the membership of the high water content is 0.2. Then, when the temperature is medium (0.6) and the water content is high (0.2), the intake volume is increased, and this rule is activated. If the membership of the temperature and the water content are both 0, the rule is not activated. The premise credibility of this rule is obtained based on the medium temperature (0.6) and the high water content (0.2). Optionally, the premise credibility of each rule in the fuzzy control rule obtained based on the temperature and water content is specifically:

[0061] Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership;

[0062] The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rule is taken as the premise credibility of the rule.

[0063] Substituting the actual measured temperature value into the temperature membership function yields its membership to the temperature fuzzy set. Similarly, substituting the actual measured water content value into the water content membership function yields its membership to the water content fuzzy set. If a rule's premise consists of multiple subconditions connected by "AND," the rule's premise credibility is the minimum of all subcondition memberships. In other words, the minimum of the temperature and water content memberships in the rule is used as the premise credibility. For example, if the temperature is medium (0.6) and the water content is high (0.2), and the air intake is increased, the premise credibility of this rule is 0.2.

[0064] Because air intake and roll angle represent two fuzzy rule sets, the premise credibility for air intake and preheating roller roll angle regulation is calculated separately. Specifically, the premise credibility for air intake regulation is calculated by summing the premise credibility of each fuzzy control rule for air intake; the premise credibility for preheating roller roll angle regulation is calculated by summing the premise credibility of each fuzzy control rule for preheating roller roll angle. The premise credibility for air intake regulation is calculated by summing the premise credibility of all activated rules in the fuzzy control rule set for air intake. Similarly, the premise credibility for preheating roller roll angle regulation is calculated by summing the premise credibility of all activated rules in the fuzzy control rule set for preheating roller roll angle.

[0065] S20, obtaining the number of times the preheating roller wrap angle is continuously adjusted in one direction as an adjustment target. If the number is greater than a threshold, the air intake amount is adjusted as the adjustment target. Otherwise, the adjustment target is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment.

[0066] Adjusting the steam intake of the preheating roller has significant hysteresis, while adjusting the wrap angle can quickly change the paper temperature. However, wrap angle adjustment has a range. Continuously adjusting the wrap angle, especially in one direction, such as increasing or decreasing it, will quickly reach the maximum or minimum allowable adjustment range. The number of consecutive wrap angle adjustments is recorded, and only those in the same direction are counted. For example, if the wrap angle increases three times in a row, the number of consecutive increases is 3. If it increases twice, then decreases once, and then increases again, the number of consecutive increases is reset to 1. To determine whether the wrap angle has been adjusted excessively, if the number of consecutive adjustments in one direction exceeds a threshold, such as 6, the air intake is selected as the target for adjustment and a more fundamental adjustment is made. If the number of consecutive wrap angle adjustments does not exceed the threshold, the adjustment target is determined based on the previously calculated premise confidence levels for the air intake adjustment and the premise confidence levels for the preheating roller wrap angle adjustment. The higher the premise confidence level, the more consistent the rule's premise is with the current input, resulting in a more accurate adjustment value. In one embodiment, the maximum of the prerequisite confidence levels for adjusting the air intake volume and the prerequisite confidence levels for adjusting the preheating roller wrap angle is used as the adjustment target. If the two are equal, the preheating roller wrap angle is used as the adjustment target. For example, if the prerequisite confidence level for the wrap angle is significantly greater than the prerequisite confidence level for the air intake volume, the wrap angle is adjusted; otherwise, the air intake volume is adjusted. If the prerequisite confidence levels are the same, the preheating roller wrap angle is used as the adjustment target.

[0067] In another embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0068] If the premise credibility of air intake adjustment is greater than that of preheating roller wrap angle adjustment, the air intake will be taken as the adjustment object;

[0069] If the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object;

[0070] If the premise credibility of the air intake adjustment is equal to the premise credibility of the preheating roller angle adjustment, then the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake are obtained, and the intermediate value of the preheating roller angle is obtained based on the maximum and minimum allowable values ​​of the preheating roller angle. Based on the intermediate value of the maximum and minimum allowable values ​​of the air intake, the relative deviation degree between the current air intake and the intermediate value of the air intake, as well as the relative deviation degree between the current preheating roller angle and the intermediate value of the preheating roller angle are obtained, and the one with the smallest relative deviation degree is taken as the adjustment object.

[0071] Similar to the previous embodiment, if the prerequisite credibility for adjusting the air intake volume and the prerequisite credibility for adjusting the preheating roller angle differ, the largest of the two is used as the adjustment target. When the two prerequisite credibility levels are equal, the maximum and minimum allowable values ​​for the preheating roller angle and air intake are obtained, respectively. Based on the maximum and minimum values, the intermediate values ​​of the preheating roller angle and air intake are calculated. For example, if the allowable range of the angle is [-10°, 20°], the intermediate value is 5°. The relative deviations of the current air intake volume and the current angle from their respective intermediate values ​​are calculated. Specifically, the absolute difference between the current air intake volume and the intermediate value of the air intake volume is calculated, and the absolute difference between the maximum and minimum allowable air intake volume values ​​is calculated to obtain the air intake volume adjustment range. The ratio of the absolute difference to the air intake volume adjustment range is used as the relative deviation of the air intake volume. More specifically, the relative deviation degree is calculated based on |current value-intermediate value| / (maximum value-minimum value); the relative deviation degree of the wrap angle is calculated in the same way, and the relative deviation degrees of the air intake volume and the wrap angle are compared. The one with the smallest relative deviation degree is selected as the adjustment object. If the relative deviation degrees are the same, the wrap angle of the preheating roller is selected as the adjustment object to avoid over-adjustment and adjustment to the limit of the allowable value.

[0072] S30, calculating the output of the regulated object in the fuzzy system, performing defuzzification to obtain a regulation value, and using the regulation value to regulate the regulated object.

[0073] After obtaining the regulated object, the output of the fuzzy system is obtained according to the fuzzy control rules of the regulated object in fuzzy control, and then defuzzification is performed. Defuzzification is the conversion of the fuzzy set into a definite value, which is used as the regulated value of the regulated object. For example, if the regulated object is an wrap angle of +2°, the actuator of the actuator will increase the wrap angle by 2°.

[0074] The second aspect is to provide a temperature control system for the corrugated paper production process, such as Figure 5 As shown, the system includes:

[0075] A premise credibility calculation module is used to obtain the temperature and moisture content of the corrugated paper after it passes through the preheating roller, construct a membership function and a fuzzy control rule, obtain the premise credibility of each rule in the fuzzy control rule based on the temperature and moisture content, and use the premise credibility of the rule to obtain the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment;

[0076] an adjustment object determination module, configured to obtain the number of times the preheating roller wrap angle is continuously adjusted in one direction as the adjustment object; if the number is greater than a threshold, the air intake volume is used as the adjustment object; otherwise, the adjustment object is determined based on the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment;

[0077] The execution module is used to calculate the output of the regulation object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulation object.

[0078] In an optional embodiment, the premise credibility of each rule in the fuzzy control rule is obtained based on the temperature and water content, specifically:

[0079] Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership;

[0080] The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rule is taken as the premise credibility of the rule.

[0081] In an optional embodiment, the premise credibility of the rule is used to obtain the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0082] The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the intake air volume adjustment premise credibility;

[0083] The premise credibility of the preheating roller wrap angle adjustment is obtained by obtaining the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle.

[0084] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0085] The maximum value of the premise credibility of the air intake adjustment and the premise credibility of the preheating roller angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller angle is taken as the adjustment object.

[0086] In an optional embodiment, the adjustment object is determined based on the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically:

[0087] If the premise credibility of air intake adjustment is greater than that of preheating roller wrap angle adjustment, the air intake will be taken as the adjustment object;

[0088] If the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object;

[0089] If the premise credibility of the air intake adjustment is equal to the premise credibility of the preheating roller angle adjustment, then the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake are obtained, and the intermediate value of the preheating roller angle is obtained based on the maximum and minimum allowable values ​​of the preheating roller angle. Based on the intermediate value of the maximum and minimum allowable values ​​of the air intake, the relative deviation degree between the current air intake and the intermediate value of the air intake, as well as the relative deviation degree between the current preheating roller angle and the intermediate value of the preheating roller angle are obtained, and the one with the smallest relative deviation degree is taken as the adjustment object.

[0090] In an optional embodiment, the relative deviation between the current air intake volume and the intermediate value of the air intake volume and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained as follows:

[0091] Calculate the absolute difference between the current intake volume and the middle value of the intake volume, and calculate the absolute difference between the maximum and minimum allowable intake volume to obtain the intake volume adjustment range. The ratio of the absolute difference to the intake volume adjustment range is used as the relative deviation degree of the intake volume.

[0092] Calculate the absolute difference between the current preheating roller and the middle value of the preheating roller, and calculate the absolute difference between the maximum and minimum values ​​allowed by the preheating roller to obtain the adjustment range of the preheating roller. The ratio of the absolute difference and the adjustment range of the preheating roller angle is used as the relative deviation degree of the preheating roller angle.

[0093] In an optional embodiment, the method of selecting the one with the smallest relative deviation as the adjustment object further includes:

[0094] If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0095] Those skilled in the art will appreciate that, in one or more of the above examples, the functions described in the various embodiments disclosed in this specification may be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions may be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium.

[0096] The specific implementation methods described above further illustrate in detail the purposes, technical solutions and beneficial effects of the multiple embodiments disclosed in this specification. It should be understood that the above description is only the specific implementation methods of the multiple embodiments disclosed in this specification, and is not intended to limit the protection scope of the multiple embodiments disclosed in this specification. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the multiple embodiments disclosed in this specification should be included in the protection scope of the multiple embodiments disclosed in this specification.

Claims

1. A temperature control method for a corrugated paper production process, characterized in that: The method comprises: The temperature and moisture content of the corrugated paper after the corrugated paper passes through the preheating roller are obtained, and the membership function of the temperature and the membership function of the moisture content are constructed. A fuzzy control rule is constructed for the air intake volume, and a fuzzy control rule is constructed for the preheating roller wrap angle. Based on the temperature and moisture content, the premise credibility of each rule in the fuzzy control rule is obtained, specifically: the temperature and moisture content are substituted into the membership function of the temperature and the membership function of the moisture content respectively to obtain the membership; the minimum value of the membership of the temperature and the membership of the moisture content in the fuzzy control rule is used as the premise credibility of the rule; the premise credibility of the air intake volume adjustment and the premise credibility of the preheating roller wrap angle adjustment are obtained using the premise credibility of the rule, specifically: the sum of the premise credibility of each fuzzy control rule of the air intake volume is obtained to obtain the premise credibility of the air intake volume adjustment, and the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle is obtained to obtain the premise credibility of the preheating roller wrap angle adjustment; Obtain the number of times the preheating roller wrap angle is taken as the adjustment object and adjusted continuously in one direction. If the number is greater than the threshold, the air intake is taken as the adjustment object. Otherwise, the adjustment object is determined based on the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment. Specifically, if the premise credibility of the air intake adjustment is greater than the premise credibility of the preheating roller wrap angle adjustment, the air intake is taken as the adjustment object; if the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object; if the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is taken as the adjustment object If the premise credibility of the quantity adjustment is equal to the premise credibility of the preheating roller wrap angle adjustment, the maximum and minimum allowable values ​​of the preheating roller wrap angle and the maximum and minimum allowable values ​​of the air intake are obtained, and the median value of the preheating roller wrap angle is obtained based on the maximum and minimum allowable values ​​of the preheating roller wrap angle. Based on the median value of the maximum and minimum allowable values ​​of the air intake, the relative deviation between the current air intake and the median value of the air intake, as well as the relative deviation between the current preheating roller wrap angle and the median value of the preheating roller wrap angle, are obtained, and the one with the smallest relative deviation is selected as the adjustment object; The output of the regulated object in the fuzzy system is calculated and defuzzified to obtain a regulation value, which is used to regulate the regulated object.

2. The method according to claim 1, wherein The relative deviation between the current air intake volume and the intermediate value of the air intake volume and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained as follows: Calculate the absolute difference between the current intake volume and the middle value of the intake volume, and calculate the absolute difference between the maximum and minimum allowable intake volume to obtain the intake volume adjustment range. The ratio of the absolute difference to the intake volume adjustment range is used as the relative deviation degree of the intake volume. Calculate the absolute difference between the current preheating roller and the middle value of the preheating roller, and calculate the absolute difference between the maximum and minimum values ​​allowed by the preheating roller to obtain the adjustment range of the preheating roller. The ratio of the absolute difference and the adjustment range of the preheating roller angle is used as the relative deviation degree of the preheating roller angle.

3. The method according to claim 1, wherein The method of taking the one with the smallest relative deviation as the adjustment object also includes: If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

4. A temperature control system for a corrugated paper production process, characterized in that: The system comprises: A premise credibility calculation module is used to obtain the temperature and moisture content of the corrugated paper after the corrugated paper passes through the preheating roller, construct a membership function of the temperature and a membership function of the moisture content, construct a fuzzy control rule for the air intake, and construct a fuzzy control rule for the preheating roller wrap angle; based on the temperature and moisture content, the premise credibility of each rule in the fuzzy control rule is obtained, specifically: the temperature and moisture content are substituted into the membership function of the temperature and the membership function of the moisture content respectively to obtain the membership; the minimum value of the membership of the temperature and the membership of the moisture content in the fuzzy control rule is used as the premise credibility of the rule; the premise credibility of the rule is used to obtain the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment, specifically: the sum of the premise credibility of each fuzzy control rule of the air intake is obtained to obtain the premise credibility of the air intake adjustment, and the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle is obtained to obtain the premise credibility of the preheating roller wrap angle adjustment; The adjustment object determination module is used to obtain the number of times the preheating roller wrap angle is used as the adjustment object and adjusted continuously in one direction. If the number is greater than a threshold, the air intake is used as the adjustment object. Otherwise, the adjustment object is determined based on the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment. Specifically, if the premise credibility of the air intake adjustment is greater than the premise credibility of the preheating roller wrap angle adjustment, the air intake is used as the adjustment object; if the premise credibility of the air intake adjustment is less than the premise credibility of the preheating roller wrap angle adjustment, the preheating roller wrap angle is used as the adjustment object. If the premise credibility of the air intake adjustment is equal to the premise credibility of the preheating roller wrap angle adjustment, then obtain the maximum and minimum allowable values ​​of the preheating roller wrap angle, as well as the maximum and minimum allowable values ​​of the air intake, obtain the median value of the preheating roller wrap angle based on the maximum and minimum allowable values ​​of the preheating roller wrap angle, and obtain the relative deviation between the current air intake and the median value of the air intake, as well as the relative deviation between the current preheating roller wrap angle and the median value of the preheating roller wrap angle, based on the median value of the maximum and minimum allowable values ​​of the air intake, and use the one with the smallest relative deviation as the adjustment object; The execution module is used to calculate the output of the regulation object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulation object.

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