Corrugated paper production process temperature control method and system

Abstract

The invention relates to a corrugated paper production process temperature control method and system, and the method comprises the steps: obtaining the temperature and water content of corrugated paper after the corrugated paper passes through a preheating roller, constructing a membership function and fuzzy control rules, obtaining the prerequisite credibility of each rule in the fuzzy control rules based on the temperature and water content, and obtaining the prerequisite credibility of each rule in the fuzzy control rules; adopting regular premise credibility to obtain the premise credibility of air inflow adjustment and the premise credibility of preheating roll wrap angle adjustment; the number of times of taking the wrap angle of the preheating roller as an adjustment object and continuously adjusting in one direction is obtained, if the number of times is larger than a threshold value, the air inflow is taken as the adjustment object, and otherwise, the adjustment object is determined based on the premise credibility of air inflow adjustment and the premise credibility of preheating roller wrap angle adjustment; and calculating the output of the adjustment object in the fuzzy system, carrying out defuzzification to obtain an adjustment value, and adjusting the adjustment object by adopting the adjustment value.

Description

Technical Field

[0001] The 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 layer of corrugated paper core and two flat surface papers. Corrugated paperboard has the characteristics of light weight, high strength, compression resistance, shock resistance, and cushioning. It can effectively protect items and prevent them from being damaged during transportation, storage, and handling. Corrugated paper is a packaging form used in almost all industries. The production process of corrugated paperboard is a complex and continuous process involving multiple links. When passing through the preheating roller, the corrugated paper will be preheated. The preheating is mainly to adapt it to the subsequent processing technology, such as bonding with the corrugated core paper. The preheating roller conducts heat through steam heating. The preheating effect will affect the flexibility and adhesion of the paper. However, factors such as the initial moisture content, quantity, and ambient temperature and humidity of the dried corrugated paperboard will affect the drying process, resulting in changes in the temperature of the preheating roller. If the temperature is not appropriate, it may even cause quality problems such as deformation and cracking of the cardboard, seriously affecting production efficiency and product quality. There are two main ways to adjust the 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 have their own advantages and disadvantages. The air intake has a larger temperature range, but the hysteresis is relatively large. The wrap angle is flexible and fast, but the adjustment range is limited. Therefore, how to give full play to the advantages of the two and reduce the impact of their disadvantages is very important for 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: Obtain the temperature and moisture content of the corrugated paper after the corrugated paper 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; Obtain the number of times the wrap angle of the preheating roller is taken as the adjustment object and adjusted continuously in one direction. If the number is greater than a threshold, the air intake amount is taken as the adjustment object; otherwise, 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; The output of the regulated object in the fuzzy system is calculated and defuzzified to obtain a regulation value, and the regulated object is regulated using the regulation value.

[0004] 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: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

[0005] 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: The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the premise credibility of the intake air volume regulation; 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.

[0006] 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: The maximum value of the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller wrap angle is taken as the adjustment object.

[0007] 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: 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 premise credibility of air intake adjustment is equal to the premise credibility of preheating roller angle adjustment, obtain the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake, obtain the middle value of the preheating roller angle based on the maximum and minimum allowable values ​​of the preheating roller angle, obtain the relative deviation degree between the current air intake and the middle value of the air intake, and obtain the relative deviation degree between the current preheating roller angle and the middle value of the preheating roller angle based on the middle value of the maximum and minimum allowable values ​​of the air intake, and take the one with the smallest relative deviation degree as the adjustment object.

[0008] In an optional embodiment, the relative deviation between the current air intake amount and the intermediate value of the air intake amount and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained, specifically: The absolute difference between the current intake volume and the middle value of the intake volume is calculated, and the absolute difference between the maximum and minimum allowable intake volume is calculated to obtain the intake volume adjustment range, and 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, and take the ratio of the absolute difference and the adjustment range of the preheating roller wrap angle as the relative deviation degree of the preheating roller wrap angle.

[0009] In an optional embodiment, the method of taking the one with the smallest relative deviation as the adjustment object further includes: If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0010] In a second aspect, a temperature control system for a corrugated paper production process is provided, the system comprising: 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 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; 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 is adjusted continuously in one direction. If the number is greater than a threshold, the air intake amount is used as the adjustment object; otherwise, 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; The execution module is used to calculate the output of the regulated object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulated object.

[0011] 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: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

[0012] 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: The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the premise credibility of the intake air volume regulation; 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.

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

[0014] 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: 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 premise credibility of air intake adjustment is equal to the premise credibility of preheating roller angle adjustment, obtain the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake, obtain the middle value of the preheating roller angle based on the maximum and minimum allowable values ​​of the preheating roller angle, obtain the relative deviation degree between the current air intake and the middle value of the air intake, and obtain the relative deviation degree between the current preheating roller angle and the middle value of the preheating roller angle based on the middle value of the maximum and minimum allowable values ​​of the air intake, and take the one with the smallest relative deviation degree as the adjustment object.

[0015] In an optional embodiment, the relative deviation between the current air intake amount and the intermediate value of the air intake amount and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained, specifically: The absolute difference between the current intake volume and the middle value of the intake volume is calculated, and the absolute difference between the maximum and minimum allowable intake volume is calculated to obtain the intake volume adjustment range, and 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, and take the ratio of the absolute difference and the adjustment range of the preheating roller wrap angle as the relative deviation degree of the preheating roller wrap angle.

[0016] In an optional embodiment, the method of taking the one with the smallest relative deviation as the adjustment object further includes: If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0017] 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.

[0018] In a fourth aspect, a computing device is provided, comprising a memory and a processor. 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.

[0019] In the process of corrugated paper production, the temperature is usually regulated by wrap angle and air intake. Although the wrap angle is easy to adjust, the adjustment range is limited. The air intake has a wide adjustment range but has a large hysteresis. The present invention determines the number of times the wrap angle of the preheating roller is used as the adjustment object and is continuously adjusted in one direction. If the number is greater than a threshold, the air intake is used as the adjustment object. Otherwise, the maximum of the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment is used as the adjustment object. The higher the premise credibility, the more consistent the premise condition of the rule is with the current input, and the more accurate the obtained adjustment value is. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of Embodiment 1; Figure 2 is a schematic diagram of a preheating roller; Figure 3 It is the schematic diagram of membership function of temperature; Figure 4 is the degree of membership when the temperature is 125 degrees; Figure 5 This is a structural diagram of the second embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0022] In the following description, the terms "first\second" involved are merely used to distinguish similar objects and do not represent a specific ordering of 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.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0024] Figure 1 A flow chart showing a first embodiment of the present invention is shown. Figure 1As shown, the temperature control methods for the corrugated paper production process include: 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 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; Among them, the preheating roller is a device used to preheat the paper during the production process of corrugated paper. Its main function is to adjust the temperature and moisture content of the corrugated paper to achieve a better bonding effect. There are two ways to adjust the temperature. One is to adjust the contact area between the corrugated paper and the surface of the preheating roller, 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 by steam heating, the temperature of the preheating roller can be controlled by adjusting the air intake.

[0025] After the corrugated paper passes through the preheating roller, the temperature and moisture content of the corrugated paper are collected. The membership function of the temperature and the membership function of the moisture content are constructed, and the fuzzy control rules for the air intake are constructed. For example, if the temperature is high and the moisture content is high, the air intake is increased; similarly, the fuzzy control rules for the wrap angle of the preheating roller are also constructed. For example, if the temperature is low and the moisture content is low, the wrap angle of the preheating roller is reduced. It should be noted that there are multiple fuzzy control rules for the air intake and the fuzzy control rules for the wrap angle.

[0026] Temperature has a membership function such as Figure 3 As shown in the figure, similarly, the 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, there may be more than one membership degree. For example, if the temperature is 115 degrees, the membership degree of the medium temperature is 0.12 when substituted into the temperature membership function, and the membership degree of the high temperature is 0.78, as shown in the figure. Figure 4 As shown, similarly, the membership obtained by substituting the water content function is not less than one. The memberships of different temperatures and different water contents are combined to determine the activated fuzzy control rules. 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 temperature is 0.6, and the membership of the high water content is 0.2. If 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 temperature (0.6) and the water content is high (0.2). Optionally, the premise credibility of each rule in the fuzzy control rule obtained based on the temperature and water content is specifically: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

[0027] Substitute the actual measured temperature value into the membership function of the temperature to obtain the membership of the temperature fuzzy set. Similarly, substitute the actual measured water content value into the membership function of the water content to obtain the membership of the water content value for the water content fuzzy set. If the premise of a rule is composed of multiple sub-conditions connected by "AND", then the premise credibility of the rule takes the minimum value of the membership of all sub-conditions, that is, the minimum value of the membership of the temperature and the membership of the water content in the rule is taken as the premise credibility of the rule. For example, if the temperature is medium (0.6) and the water content is high (0.2), increase the intake volume, and the premise credibility of this rule is 0.2.

[0028] Since the air intake and the wrap angle are two fuzzy rule sets, the premise credibility of the air intake regulation and the premise credibility of the preheating roller wrap angle regulation are calculated respectively. Specifically, the premise credibility of the air intake regulation is obtained by obtaining the sum of the premise credibility of each fuzzy control rule of the air intake; the premise credibility of the preheating roller wrap angle regulation is obtained by obtaining the sum of the premise credibility of each fuzzy control rule of the preheating roller wrap angle. The premise credibility of the air intake regulation is obtained by adding the premise credibility of all activated rules in the fuzzy control rule set corresponding to the air intake. Similarly, the premise credibility of the preheating roller wrap angle regulation is obtained by adding the premise credibility of all activated rules in the fuzzy control rule set corresponding to the preheating roller wrap angle.

[0029] S20, obtaining the number of times the wrap angle of the preheating roller is taken as the adjustment object and adjusted in one direction continuously, 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 adjustment of the air intake and the premise credibility of the adjustment of the wrap angle of the preheating roller; The preheating roller has a large hysteresis when adjusting the steam intake, while adjusting the wrap angle can change the temperature of the paper quickly. However, there is a range for the wrap angle adjustment. If the wrap angle is continuously adjusted, especially in one direction, such as continuously increasing or decreasing the wrap angle, the maximum or minimum adjustment amount allowed for the wrap angle will soon be reached. Record the number of continuous adjustments of the wrap angle, and only record the number of continuous adjustments in the same direction. For example, if the wrap angle increases three times in a row, the number of continuous increases in the direction is 3; if it increases twice, then decreases once, and then increases once, the number of continuous increases in the direction will be reset to 1. Determine whether the wrap angle is adjusted too much continuously. If the number of continuous adjustments in one direction is greater than the threshold, such as the threshold is 6, the air intake is used as the adjustment object, and the air intake is used for more fundamental adjustments. If the number of continuous adjustments of the wrap angle does not exceed the threshold, 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 calculated previously. The higher the premise credibility, the more consistent the premise of the rule is with the current input, and the more accurate the adjustment value is. In one embodiment, the maximum value of the premise credibility of the air intake adjustment and the premise credibility of the preheating roller wrap angle adjustment is used as the adjustment object; if the two are the same, the preheating roller wrap angle is used as the adjustment object. For example, if the premise credibility of the wrap angle is much greater than the premise credibility of the air intake, the wrap angle is adjusted; otherwise, the air intake is adjusted. If the premise credibility is the same, the preheating roller wrap angle is used as the adjustment object.

[0030] 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: 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 premise credibility of air intake adjustment is equal to the premise credibility of preheating roller angle adjustment, obtain the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake, obtain the middle value of the preheating roller angle based on the maximum and minimum allowable values ​​of the preheating roller angle, obtain the relative deviation degree between the current air intake and the middle value of the air intake, and obtain the relative deviation degree between the current preheating roller angle and the middle value of the preheating roller angle based on the middle value of the maximum and minimum allowable values ​​of the air intake, and take the one with the smallest relative deviation degree as the adjustment object.

[0031] Similar to the previous embodiment, if the premise credibility of the air intake adjustment and the premise credibility of the preheating roller angle adjustment are different, the largest of the two is used as the adjustment object. When the two premise credibility are equal, the maximum and minimum allowable values ​​of the preheating roller angle and the air intake are obtained respectively, and the intermediate values ​​of the preheating roller angle and the air intake are calculated respectively according to the maximum and minimum values. For example, if the allowable range of the angle is [-10°, 20°], the intermediate value is 5°. The relative deviation degree of the current air intake and the current angle from their respective intermediate values ​​is calculated respectively. Specifically, the absolute difference between the current air intake and the intermediate value of the air intake is calculated, and the absolute difference between the maximum and minimum allowable values ​​of the air intake is calculated to obtain the air intake adjustment range, and the ratio of the absolute difference to the air intake adjustment range is used as the relative deviation degree of the air intake. More specifically, the relative deviation degree is calculated according to |current value-middle 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.

[0032] S30, calculating the output of the regulated object in the fuzzy system, and performing defuzzification to obtain a regulation value, and using the regulation value to regulate the regulated object.

[0033] After obtaining the adjustment object, the output of the fuzzy system is obtained according to the fuzzy control rules of the adjustment object in fuzzy control, and then defuzzification is performed, wherein defuzzification is the conversion of the fuzzy set into a definite value, and this value is used as the adjustment value of the adjustment object. For example, if the adjustment object is an wrap angle of +2°, the actuator of the actuator will increase the wrap angle by 2°.

[0034] The second aspect is to provide a temperature control system for a corrugated paper production process, such as Figure 5 As shown, 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 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; 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 is adjusted continuously in one direction. If the number is greater than a threshold, the air intake amount is used as the adjustment object; otherwise, 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; The execution module is used to calculate the output of the regulated object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulated object.

[0035] 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: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

[0036] 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: The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the premise credibility of the intake air volume regulation; 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.

[0037] 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: The maximum value of the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller wrap angle is taken as the adjustment object.

[0038] 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: 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 premise credibility of air intake adjustment is equal to the premise credibility of preheating roller angle adjustment, obtain the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake, obtain the middle value of the preheating roller angle based on the maximum and minimum allowable values ​​of the preheating roller angle, obtain the relative deviation degree between the current air intake and the middle value of the air intake, and obtain the relative deviation degree between the current preheating roller angle and the middle value of the preheating roller angle based on the middle value of the maximum and minimum allowable values ​​of the air intake, and take the one with the smallest relative deviation degree as the adjustment object.

[0039] In an optional embodiment, the relative deviation between the current air intake amount and the intermediate value of the air intake amount and the relative deviation between the current preheating roller wrap angle and the intermediate value of the preheating roller wrap angle are obtained, specifically: The absolute difference between the current intake volume and the middle value of the intake volume is calculated, and the absolute difference between the maximum and minimum allowable intake volume is calculated to obtain the intake volume adjustment range, and 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, and take the ratio of the absolute difference and the adjustment range of the preheating roller wrap angle as the relative deviation degree of the preheating roller wrap angle.

[0040] In an optional embodiment, the method of taking the one with the smallest relative deviation as the adjustment object further includes: If the relative deviation is the same, the wrap angle of the preheating roller is taken as the adjustment object.

[0041] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the multiple embodiments disclosed in this specification can be implemented by hardware, software, firmware, or any combination thereof. When implemented by software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium.

[0042] 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 used to limit the protection scope of the multiple embodiments disclosed in this specification. Any modifications, equivalent substitutions, 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 method for controlling temperature in a corrugated paper production process, characterized in that: The method comprises: Obtain the temperature and moisture content of the corrugated paper after the corrugated paper 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; Obtain the number of times the wrap angle of the preheating roller is taken as the adjustment object and adjusted continuously in one direction. If the number is greater than a threshold, the air intake amount is taken as the adjustment object; otherwise, 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; The output of the regulated object in the fuzzy system is calculated and defuzzified to obtain a regulation value, and the regulated object is regulated using the regulation value.

2. The method according to claim 1, characterized in that The premise credibility of each rule in the fuzzy control rule obtained based on the temperature and water content is specifically: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

3. The method according to claim 1, characterized in that The premise credibility of the adoption 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, which is specifically: The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the premise credibility of the intake air volume regulation; 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.

4. The method according to claim 1, characterized in that 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: The maximum value of the premise credibility of the air intake amount adjustment and the premise credibility of the preheating roller wrap angle adjustment is taken as the adjustment object; if the two are the same, the preheating roller wrap angle is taken as the adjustment object.

5. The method according to claim 1, characterized in that 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: 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 premise credibility of air intake adjustment is equal to the premise credibility of preheating roller angle adjustment, obtain the maximum and minimum allowable values ​​of the preheating roller angle and the maximum and minimum allowable values ​​of the air intake, obtain the middle value of the preheating roller angle based on the maximum and minimum allowable values ​​of the preheating roller angle, obtain the relative deviation degree between the current air intake and the middle value of the air intake, and obtain the relative deviation degree between the current preheating roller angle and the middle value of the preheating roller angle based on the middle value of the maximum and minimum allowable values ​​of the air intake, and take the one with the smallest relative deviation degree as the adjustment object.

6. The method according to claim 5, characterized in that The relative deviation between the current air intake and the intermediate value of the air intake 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: The absolute difference between the current intake volume and the middle value of the intake volume is calculated, and the absolute difference between the maximum and minimum allowable intake volume is calculated to obtain the intake volume adjustment range, and 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, and take the ratio of the absolute difference and the adjustment range of the preheating roller wrap angle as the relative deviation degree of the preheating roller wrap angle.

7. The method according to claim 5, characterized in that 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.

8. 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 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; 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 is adjusted continuously in one direction. If the number is greater than a threshold, the air intake amount is used as the adjustment object; otherwise, 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; The execution module is used to calculate the output of the regulated object in the fuzzy system, perform defuzzification to obtain a regulation value, and use the regulation value to regulate the regulated object.

9. The system according to claim 8, characterized in that The premise credibility of each rule in the fuzzy control rule obtained based on the temperature and water content is specifically: Substitute the temperature and water content into the membership function of temperature and the membership function of water content respectively to obtain the membership degree; The minimum value of the membership degree of temperature and the membership degree of water content in the fuzzy control rules is taken as the premise credibility of the rule.

10. The system according to claim 8, characterized in that The premise credibility of the adoption 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, which is specifically: The sum of the premise credibility of each fuzzy control rule of the intake air volume is obtained to obtain the premise credibility of the intake air volume regulation; 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.

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