A high-speed slitting device for digital transfer paper

Abstract

The present invention relates to the technical field of slitting devices, and particularly to a high-speed slitting device for digital transfer paper. The slitting device includes a tension control module, which includes a data acquisition module, a data processing module, and a slitting control module, and is used to achieve: acquiring the paper tension data and slitting speed data corresponding between every two adjacent rollers during each historical slitting process of the cut paper, and each historical slitting process corresponds to the same cutting size; analyzing the paper tension data and slitting speed data to determine the corresponding tension reference value between every two adjacent rollers; during the real-time slitting process of the cut paper with the same cutting size, according to the difference between the paper tension corresponding between every two adjacent rollers collected in real time and the corresponding tension reference value, the paper tension corresponding between every two adjacent rollers is controlled in real time. The present invention effectively improves the paper tension control effect by adaptively determining a suitable tension reference value.

Description

Technical Field

[0001] The present invention relates to the technical field of slitting devices, and particularly to a high-speed slitting device for digital transfer paper. Background Art

[0002] Different paper usage requirements have different requirements for the paper size. When manufacturing paper, generally the paper size is not adjusted to improve efficiency. Therefore, in order to meet the sizes of different paper usage requirements, the obtained paper needs to be cut and divided. Digital transfer paper plays an important role in industrial production. When it is slit, a large paper roll is cut into multiple paper rolls of desired sizes by a slitting device. Since digital transfer paper requires a certain precision during use, the whole roll of paper cannot be directly slit. Instead, the obtained roll paper needs to be unrolled and then cut, and after cutting, the paper of different sizes is rewound.

[0003] In the prior art, during the process of cutting the whole roll of digital transfer paper, the paper is spread open by a roller, and then the spread paper is cut into a suitable size by a rotating cutter. Finally, the cut paper is rewound. Since the tension of the paper spread open by the roller directly affects the cutting quality, when the tension is too small, the paper will be deformed under the extrusion of the cutter head during cutting, and at the same time, the cutting edge of the paper is not clear, resulting in the phenomenon of wrinkling of the rewound paper. However, when the tension between the papers is excessively increased, the paper will be deformed under the action of the tension, and even the papers will be broken due to the excessive tension borne between the papers. Therefore, it is necessary to accurately control the tension of the paper.

[0004] When controlling the paper tension during the traditional process of cutting digital transfer paper, the tension control module in the slitting device is connected to the unwinding group through a magnetic powder brake, and the control is realized through a direct tension closed-loop control method, that is: comparing the detected tension with the given tension. When the detected tension is too high, the current applied to the magnetic powder brake is reduced to weaken the braking torque, so that the unwinding speed is increased, thereby reducing the tension; on the contrary, when the detected tension is too low, the current applied to the magnetic powder brake is increased to enhance the braking torque, and the unwinding speed is slowed down, thereby increasing the tension. However, during the process of realizing the control through the direct tension closed-loop control method, in order to achieve more accurate control, dynamic and static compensation usually needs to be carried out, that is, the required control amount needs to be determined through an indirect control algorithm. The control process is relatively complex and is not easy to adapt to the cutting processes of papers with multiple different cutting sizes, and the paper tension control effect is poor. Summary of the Invention

[0005] The object of the present invention is to provide a high-speed slitting device for digital transfer paper, which is used to solve the problem of poor control effect of paper tension in the process of cutting digital transfer paper in the prior art.

[0006] To solve the above technical problems, in a first aspect, the present invention provides a high-speed slitting device for digital transfer paper. The slitting device includes a tension control module, and the tension control module includes:

[0007] A data acquisition module, which is used to acquire the paper tension data and slitting speed data corresponding between every two adjacent rollers during each historical cutting process of the cutting paper, and the historical cutting processes correspond to the same cutting size;

[0008] A data processing module, which is used to determine the upper tension limit value corresponding between every two adjacent rollers according to the change situation of the paper tension data corresponding between every two adjacent rollers in each historical cutting process; according to the change situation of the paper tension data corresponding between every two adjacent rollers in each historical cutting process, and the change situation of the paper tension data corresponding between every two adjacent rollers in each historical cutting process with respect to the slitting speed data, determine the lower tension limit value corresponding between every two adjacent rollers; according to the upper tension limit value and the lower tension limit value, determine the tension reference value corresponding between every two adjacent rollers;

[0009] A slitting control module, which is used to, during the real-time cutting process of the cutting paper with the same cutting size, perform real-time control on the paper tension corresponding between every two adjacent rollers according to the difference between the paper tension corresponding between every two adjacent rollers collected in real time and the corresponding tension reference value.

[0010] Combined with the above first aspect, in some possible implementation manners, determining the upper tension limit value corresponding between every two adjacent rollers includes:

[0011] According to the overall distribution level of the paper tension data corresponding between every two adjacent rollers in each historical cutting process, determine the average paper tension value corresponding between every two adjacent rollers;

[0012] According to the difference situation of the paper tension data corresponding between every two adjacent rollers in each historical cutting process, and the difference situation of the paper tension data corresponding between all adjacent two rollers at the same moment in each historical cutting process, determine the weighted standard deviation of the paper tension corresponding between every two adjacent rollers;

[0013] Determine the added value of the average paper tension value and the weighted standard deviation of the paper tension corresponding between every two adjacent rollers, and determine the added value as the upper tension limit value corresponding between every two adjacent rollers.

[0014] Combined with the above first aspect, in some possible implementation manners, determining the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers includes:

[0015] Determining the average value and variance of the paper tension data corresponding to each adjacent pair of rollers at the same moment in all historical cutting processes, to obtain a first average value and a first variance;

[0016] According to the first variance, and the difference between each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process and the first average value, determining the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process;

[0017] According to the difference situation of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, and the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, determining the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers.

[0018] Combined with the above first aspect, in some possible implementation manners, determining the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers includes:

[0019] Determining the average value of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, to obtain a second average value;

[0020] According to the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, determining the weight value of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process;

[0021] According to the weight value, calculating the standard deviation by weighting the difference between each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process and the second average value, so as to obtain the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers.

[0022] Combined with the above first aspect, in some possible implementation manners, determining the lower limit value of the tension corresponding to each adjacent pair of rollers includes:

[0023] According to the paper tension data and the splitting speed data corresponding to each adjacent pair of rollers in each historical cutting process, determining the minimum paper tension between each adjacent pair of rollers at each splitting speed;

[0024] Performing curve fitting on the minimum paper tensions corresponding to each adjacent pair of rollers at all splitting speeds, to obtain a fitting curve;

[0025] According to the changing trend of the fitting curve and the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers, correct the minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds to obtain the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds;

[0026] According to the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds, and the difference between the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds and the upper limit value of the tension corresponding to the corresponding two rollers, determine the lower limit value of the tension corresponding to each adjacent pair of rollers.

[0027] Combined with the above first aspect, in some possible implementation manners, determining the lower limit value of the tension corresponding to each adjacent pair of rollers includes:

[0028] According to the magnitude of the difference between the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds and the upper limit value of the tension corresponding to the corresponding adjacent pair of rollers, determine the reference minimum slitting speed corresponding to each adjacent pair of rollers;

[0029] Determine the minimum value among the reference minimum slitting speeds corresponding to each adjacent pair of rollers, and use the corrected minimum paper tension corresponding to each adjacent pair of rollers at the minimum value as the lower limit value of the tension corresponding to each adjacent pair of rollers.

[0030] Combined with the above first aspect, in some possible implementation manners, determining the reference minimum slitting speed corresponding to each adjacent pair of rollers includes:

[0031] Determine the absolute value of the difference between the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds and the upper limit value of the tension corresponding to the corresponding adjacent pair of rollers, and determine the slitting speed corresponding to the corrected minimum paper tension whose normalized value of the absolute value of the difference is less than the set threshold as the reference minimum slitting speed corresponding to each adjacent pair of rollers.

[0032] Combined with the above first aspect, in some possible implementation manners, correcting the minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds to obtain the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds includes:

[0033] Determine each maximum point in the fitting curve;

[0034] Using the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers, correct the minimum paper tension corresponding to the maximum value point in the fitting curve to obtain the corrected minimum paper tension corresponding to each adjacent pair of rollers at all slitting speeds.

[0035] Combined with the first aspect above, in some possible implementation manners, determining the tension reference value corresponding to each adjacent pair of rollers according to the upper tension limit value and the lower tension limit value includes:

[0036] Determine the average value of the upper tension limit value and the lower tension limit value as the tension reference value corresponding to each adjacent pair of rollers.

[0037] Combined with the first aspect above, in some possible implementation manners, according to the difference between the paper tension corresponding to each adjacent pair of rollers collected in real time and the corresponding tension reference value, use PID control to perform real-time control on the paper tension corresponding to each adjacent pair of rollers.

[0038] To solve the above technical problems, in a second aspect, the present invention further provides a high-speed slitting tension control method for digital transfer paper, and the method includes:

[0039] Obtain the paper tension data and slitting speed data corresponding to each adjacent pair of rollers during each historical cutting process of the cut paper, and the each historical cutting process corresponds to the same cutting size;

[0040] According to the change situation of the paper tension data corresponding to all adjacent pairs of rollers during each historical cutting process, determine the upper tension limit value corresponding to each adjacent pair of rollers; according to the change situation of the paper tension data corresponding to all adjacent pairs of rollers during each historical cutting process, and the change situation of the paper tension data corresponding to each adjacent pair of rollers with respect to the slitting speed data during each historical cutting process, determine the lower tension limit value corresponding to each adjacent pair of rollers; according to the upper tension limit value and the lower tension limit value, determine the tension reference value corresponding to each adjacent pair of rollers;

[0041] During the real-time cutting process of the cut paper with the same cutting size, perform real-time control on the paper tension corresponding to each adjacent pair of rollers according to the difference between the paper tension corresponding to each adjacent pair of rollers collected in real time and the corresponding tension reference value.

[0042] The present invention has the following beneficial effects: When processing cut paper of a certain cut size, first obtain the paper tension data and splitting speed data corresponding to the cut paper of this cut size between every two adjacent rollers in each historical cutting process. Since the tension ranges that digital transfer papers of different sizes can withstand are different, by analyzing the variation of the paper tension data corresponding to every two adjacent rollers in all historical cutting processes under the same cut size, the upper tension limit value corresponding to every two adjacent rollers can be determined. Considering that the speed at which the splitting device cuts the paper during operation will also affect the change in the minimum required tension between the papers, a faster cutting requires a greater tension to ensure that the paper does not deviate or slip during the cutting process, but it will not affect the maximum required tension of the paper. Therefore, the variation of the paper tension data corresponding to every two adjacent rollers in all historical cutting processes can be combined to analyze the variation of the paper tension data corresponding to every two adjacent rollers with respect to the splitting speed data in each historical cutting process, so as to determine the lower tension limit value corresponding to every two adjacent rollers. According to the upper tension limit value and the lower tension limit value, the tension reference value corresponding to every two adjacent rollers can be determined. During the processing of the cut paper of this certain cut size, according to the difference between the paper tension corresponding to every two adjacent rollers collected in real time and the corresponding tension reference value, the paper tension corresponding to every two adjacent rollers is controlled in real time to improve the control reliability. The present invention analyzes the paper tension data and splitting speed data corresponding to every two adjacent rollers in each historical cutting process of the cut paper of a certain cut size, adaptively determines a suitable tension reference value, and then directly controls the paper tension corresponding to every two adjacent rollers in real time during the real-time processing of the cut paper of this certain cut size, without the need for other compensations, and is applicable to the paper cutting process of different cut sizes, effectively improving the paper tension control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 The first axonometric view of a high-speed splitting device for digital transfer paper according to an embodiment of the present invention;

[0045] Figure 2 The second axonometric view of a high-speed splitting device for digital transfer paper according to an embodiment of the present invention;

[0046] Figure 3 Schematic structural diagram of the tension control module according to an embodiment of the present invention;

[0047] Figure 4 Flowchart of the steps of a high-speed slitting tension control method for digital transfer paper according to an embodiment of the present invention;

[0048] Wherein: 1 represents a support structure; 2 represents an unwinding module; 3 represents a slitting module; 4 represents a guiding module; 5 represents a tension sensor in the tension control module; 6 represents a winding module; 7 represents a magnetic powder brake in the tension control module. Specific embodiments

[0049] To clearly illustrate the technical features of the present solution, the present invention will be described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0050] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0051] It should be understood that the various steps recited in the method embodiments of the present invention can be executed in a different order and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this regard.

[0052] As used herein, the term "including" and its variants are open-ended, that is, "including but not limited to". The term "based on" is "at least partially based on". The term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0053] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependent relationships.

[0054] In the embodiments of the present invention, although the operations or steps are described in a specific order in the drawings, it should not be understood that they are required to be performed in the specific order shown or in a serial order, or that all the operations or steps shown are required to be performed to obtain the desired result. In the embodiments of the present invention, these operations or steps can be performed serially; they can also be performed in parallel; or a part of these operations or steps can be performed.

[0055] Meanwhile, it can be understood that the data involved in the technical solution of the present invention (including but not limited to the data itself, the acquisition or use of data) should comply with the requirements of corresponding laws, regulations and related provisions. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs, and all parameters or indicators in the formulas involved in the present invention are numerical values after normalization that eliminate the influence of dimensions.

[0056] To solve the problem of poor control effect of paper tension in the existing process of cutting digital transfer paper, an embodiment of the present invention provides a high-speed slitting device for digital transfer paper. The slitting device analyzes the paper tension data and slitting speed data corresponding between every two adjacent rollers in each historical cutting process of the cut paper of a certain cutting size, adaptively determines a suitable tension reference value corresponding between every two adjacent rollers, and then in the real-time processing of the cut paper of a certain cutting size, directly controls the paper tension corresponding between every two adjacent rollers in real time according to the difference between the paper tension corresponding between every two adjacent rollers collected in real time and the corresponding tension reference value, without other compensation, and is suitable for the paper cutting process of different cutting sizes, effectively improving the control effect of paper tension.

[0057] Next, a high-speed slitting device for digital transfer paper provided by an embodiment of the present invention will be introduced in detail with reference to the accompanying drawings.

[0058] An embodiment of the present invention provides a high-speed slitting device for digital transfer paper, Figure 1 and Figure 2 respectively show a first axonometric schematic diagram and a second axonometric schematic diagram of the slitting device provided by an embodiment of the present invention. As Figure 1 and Figure 2 shown, the slitting device mainly consists of a support structure 1, an unwinding module 2, a slitting module 3, a guiding module 4, a tension control module and a winding module 6, wherein:

[0059] The support structure 1 serves as the framework for supporting the entire slitting device, and its main function is to provide support for the main body of the entire slitting device.

[0060] The unwinding module 2 is responsible for smoothly unwinding the large roll of digital transfer paper raw material paper. The implementation method is to sleeve the roll paper in a sleeve, where there is a motor in the sleeve to drive the roll paper to rotate, and the paper is squeezed and laid flat through two rollers. The slitting module 3 is responsible for cutting the unwound digital transfer paper raw material paper into several strips according to a predetermined width. The implementation method is to cut the paper on the vertical plane of the paper through a rotating cutting tool head, and the position of the tool head can be controlled by a stepping motor to facilitate left and right movement for adjusting the cutting size. The slitting module 3 is usually equipped with precise blades and cutting mechanisms to ensure that the cutting edges are neat and free of burrs. The guiding module 4 is responsible for guiding the digital transfer paper material to move along the correct path to ensure that the digital transfer paper material does not shift during the slitting and winding processes. The tension control module, as the control device of the slitting module 3, is mainly responsible for maintaining a constant tension of the digital transfer paper raw material paper throughout the processing. The implementation method is as Figure 1 and Figure 2 shown. By setting tension sensors 5 on the end shafts on both sides of the guiding rollers, during the process of the slitting module 3 in the above slitting device cutting the digital transfer paper raw material paper, the paper tension data corresponding to the paper between every two adjacent rollers is collected, and the magnetic powder brake 7 is connected to the air shaft through a transmission part, so that the magnetic powder brake 7 is connected to the unwinding group, and the torque of the unwinding group of the slitter is controlled through a direct tension closed-loop control method, thereby adjusting the unwinding speed. The winding module 6 is responsible for rewinding the cut and slit digital transfer paper material into small rolls. The winding module 6 needs to be able to adapt to coils of different diameters and keep the winding neat and tight.

[0061] In view of the problem that in the prior art, during the operation of the slitting device, when the tension control module controls the paper tension during the cutting of digital transfer paper, in order to achieve more precise control, dynamic and static compensation usually needs to be carried out, that is, the required control amount needs to be determined through an indirect control algorithm, the control process is relatively complex, and it is not easy to adapt to the cutting processes of papers with multiple different cutting sizes, and the paper tension control effect is poor. The above digital transfer paper high-speed slitting device provided by the embodiments of the present invention collects the paper tension data corresponding to the paper between every two adjacent rollers in each historical cutting process of the cut paper of the same cutting size by using the tension sensor 5 in the tension control module, and simultaneously synchronously obtains the cutting speed data corresponding to the paper between every two adjacent rollers in each historical cutting process. By analyzing these paper tension data and cutting speed data, the corresponding tension reference value between every two adjacent rollers is adaptively determined. Furthermore, during the real-time cutting process of the cut paper of the same cutting size, according to the difference between the real-time collected paper tension corresponding to the paper between every two adjacent rollers and the corresponding tension reference value, the paper tension corresponding to the paper between every two adjacent rollers is accurately and real-timely controlled to improve the paper tension control effect.

[0062] To implement the above control process, as Figure 3 shown, the function modules of the tension control module of the above digital transfer paper high-speed slitting device provided by the embodiments of the present invention are divided to obtain a data acquisition module, a data processing module, and a slitting control module. The data acquisition module can be implemented by a data memory, the data processing module can be implemented by a data processor, and the slitting control module can be implemented by an existing control module that can control the paper tension during the cutting process of digital transfer paper through a direct tension closed-loop control method. The data acquisition module, the data processing module, and the slitting control module cooperate with each other. The core is to implement a digital transfer paper high-speed slitting tension control method, and the flowchart corresponding to this method is as Figure 4 shown. Below, in combination with the specific steps in this method, each module obtained by dividing the tension control module of the above digital transfer paper high-speed slitting device provided by the embodiments of the present invention will be introduced in detail.

[0063] The data acquisition module is used to acquire the paper tension data and the slitting speed data corresponding between every two adjacent rollers during each historical cutting process of the cutting paper, and the historical cutting processes correspond to the same cutting size.

[0064] When using the slitting device provided by the embodiments of the present invention to process digital transfer paper of a certain cutting size, first obtain the paper tension data and the slitting speed data corresponding between every two adjacent rollers during each historical cutting process when the slitting device is used to process cutting paper of the same cutting size in the past. Among them, the paper tension data is collected by the tension sensor in the tension control module of the slitting device during each historical cutting process, and the collected paper tension data is stored in the data acquisition module of the tension control module of the slitting device. The data acquisition frequency of the tension sensor can be reasonably set as needed, such as 1 time / minute, and all tension sensors need to collect data synchronously. At the same time, by using a rotational speed sensor, the slitting speed data (i.e., the rotational speed of the paper) corresponding to the paper between every two adjacent rollers during each historical cutting process is synchronously collected, and the collected slitting speed data is stored in the data acquisition module of the tension control module of the slitting device.

[0065] A data processing module is used to determine the upper tension limit value corresponding to each pair of adjacent rollers according to the change of the paper tension data between all adjacent rollers in each historical cutting process; determine the lower tension limit value corresponding to each pair of adjacent rollers according to the change of the paper tension data between all adjacent rollers in each historical cutting process and the change of the paper tension data corresponding to each pair of adjacent rollers with the splitting speed data in each historical cutting process; and determine the tension reference value corresponding to each pair of adjacent rollers according to the upper tension limit value and the lower tension limit value.

[0066] Digital transfer papers of different sizes can withstand different tension ranges. Based on the change of the paper tension data between all adjacent rollers in each historical cutting process under the same cutting size, analyzing the mean and standard deviation of the paper tension data can determine the upper tension limit value corresponding to each pair of adjacent rollers.

[0067] In some possible implementation manners, the implementation steps for determining the upper tension limit value corresponding to each pair of adjacent rollers include:

[0068] Step S201: Determine the mean value of the paper tension corresponding to each pair of adjacent rollers according to the overall distribution level of the paper tension data between each pair of adjacent rollers in each historical cutting process.

[0069] Calculate the average value of the paper tension data corresponding to each historical cutting process between the same pair of adjacent rollers to obtain the mean value of the paper tension. This mean value of the paper tension represents the overall distribution level of all the paper tension data between the same pair of adjacent rollers. In other possible implementation manners, the median or mode of the paper tension data corresponding to each historical cutting process can also be determined to obtain the mean value of the paper tension.

[0070] Step S202: Determine the weighted standard deviation of the paper tension corresponding to each pair of adjacent rollers according to the difference situation of the paper tension data between each pair of adjacent rollers in each historical cutting process and the difference situation of the paper tension data corresponding to all adjacent rollers at the same moment in each historical cutting process.

[0071] Based on the average value of the paper tension corresponding to each adjacent pair of rollers, and according to the difference of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, the standard deviation of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process is determined. Then, the upper limit value of the tension can be determined based on the average value and the standard deviation of the paper tension. However, considering the influence of different positions, the credibility of different paper tension data is different. In order to more accurately determine the upper limit value of the tension, it is necessary to combine the differences of the paper tension data corresponding to all adjacent pairs of rollers at the same time in each historical cutting process to correct the process of obtaining the standard deviation, so as to obtain the weighted standard deviation of the paper tension, and determine the upper limit value of the tension based on the average value of the paper tension and the weighted standard deviation of the paper tension.

[0072] In some possible implementation manners, to determine the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers, the implementation steps include:

[0073] Step S2021: Determine the average value and variance of the paper tension data corresponding to all adjacent pairs of rollers at the same time in each historical cutting process, and obtain the first average value and the first variance.

[0074] In each historical cutting process, for the paper tension data corresponding to different adjacent pairs of rollers at the same time t, obtain the corresponding average value and variance, so as to obtain the first average value and the first variance.

[0075] Step S2022: According to the first variance, and the difference between each paper tension data corresponding to each adjacent pair of rollers and the first average value in each historical cutting process, determine the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process.

[0076] In each historical cutting process, for the paper tension data corresponding to different adjacent pairs of rollers at the same time t, calculate the variance contribution rate corresponding to any paper tension data. The corresponding calculation formula is:

[0077] ;

[0078] Wherein, represents the variance contribution rate corresponding to the z-th paper tension data among the paper tension data corresponding to different adjacent pairs of rollers at the same time t; represents the z-th paper tension data among the paper tension data corresponding to different adjacent pairs of rollers at the same time t; represents the average value of the paper tension data corresponding to different adjacent pairs of rollers at the same time t, that is, the first average value; It represents the variance of the paper tension data corresponding to different adjacent pairs of rollers at the same moment t, that is, the first variance.

[0079] In the above calculation formula, the larger the variance contribution rate, the more outlier the z-th paper tension data is among all the paper tension data corresponding to adjacent pairs of rollers at the same moment t, and the lower its corresponding credibility.

[0080] Step S2023: Determine the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers according to the difference situation of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, and the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process.

[0081] Based on the difference situation of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process, the standard deviation of the paper tension corresponding to each adjacent pair of rollers can be calculated. However, considering that the credibility of different paper tension data is different, it is necessary to correct the process of calculating the standard deviation of the paper tension according to the variance contribution rate of each paper tension data to obtain the corresponding weighted standard deviation of the paper tension.

[0082] In some possible implementation manners, the implementation steps for determining the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers include:

[0083] Step S20231: Determine the average value of the paper tension data corresponding to each adjacent pair of rollers in each historical cutting process to obtain the second average value.

[0084] For the same adjacent pair of rollers, calculate the average value of all the paper tension data obtained in each historical cutting process to obtain the second average value. In other possible implementation manners, the median or mode of all the paper tension data obtained in each historical cutting process can also be determined to obtain the second average value.

[0085] Step S20232: Determine the weight value of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process according to the variance contribution rate of each paper tension data corresponding to each adjacent pair of rollers in each historical cutting process.

[0086] Since the larger the variance contribution rate, it indicates that the credibility of the corresponding paper tension data among the paper tension data corresponding to adjacent pairs of rollers at the same moment is lower, and the weight value corresponding to the corresponding paper tension data when participating in the standard deviation calculation should be smaller.

[0087] Step S20233: According to the weights, calculate the weighted standard deviation of the difference between each paper tension data corresponding to every two adjacent rollers in each historical cutting process and the second average value, so as to obtain the weighted standard deviation of the paper tension corresponding to every two adjacent rollers.

[0088] Between the same two adjacent rollers, based on the weights of each paper tension data in each historical cutting process, calculate the weighted standard deviation of the difference between the paper tension data and the second average value, so as to obtain the corresponding weighted standard deviation of the paper tension. The corresponding calculation formula is:

[0089] ;

[0090] Among them, represents the weighted standard deviation of the paper tension corresponding to every two adjacent rollers; represents the nth paper tension data corresponding to every two adjacent rollers in each historical cutting process; represents the average value of the paper tension data corresponding to every two adjacent rollers in each historical cutting process, that is, the second average value; represents the variance contribution rate of the nth paper tension data corresponding to every two adjacent rollers in each historical cutting process; represents the weight of the nth paper tension data corresponding to every two adjacent rollers in each historical cutting process; represents the exponential function with the natural constant e as the base; represents the total number of paper tension data corresponding to every two adjacent rollers in each historical cutting process.

[0091] In the above calculation formula, by using the exponential function with the natural constant e as the base to perform negative correlation normalization processing on the variance contribution rate of the nth paper tension data corresponding to every two adjacent rollers, the corresponding weight is obtained. Using this weight to weight the difference between the nth paper tension data and the second average value, so as to obtain the weighted standard deviation of the paper tension, effectively improving the accuracy of the obtained standard deviation.

[0092] Step S203: Determine the sum value of the paper tension mean value and the weighted standard deviation of the paper tension corresponding to every two adjacent rollers, and determine the sum value as the tension upper limit value corresponding to every two adjacent rollers.

[0093] Add the paper tension mean value and the weighted standard deviation of the paper tension corresponding to every two adjacent rollers. The obtained sum value is the tension upper limit value corresponding to every two adjacent rollers.

[0094] Considering that the speed of cutting the paper by the slitting device during operation will also affect the change in the minimum required tension between the papers, a faster cutting requires a greater tension to ensure that the paper does not deviate or slip during cutting (sliding friction occurs between the paper and the guide roller), but this will not affect the maximum required tension of the paper. Therefore, the change in the paper tension data corresponding to all adjacent two rollers during each historical cutting process can be combined to analyze the change in the paper tension data corresponding to each adjacent two rollers with respect to the cutting speed data during each historical cutting process, so as to determine the lower limit value of the tension corresponding to each adjacent two rollers.

[0095] In some possible implementation manners, to determine the lower limit value of the tension corresponding to each adjacent two rollers, the implementation steps include:

[0096] Step S211: According to the paper tension data and the cutting speed data corresponding to each adjacent two rollers during each historical cutting process, determine the minimum paper tension between each adjacent two rollers at each cutting speed.

[0097] Between the same adjacent two rollers, according to the paper tension data and the cutting speed data obtained during each historical cutting process, a two-dimensional coordinate system is constructed. The abscissa of the two-dimensional coordinate system is the cutting speed, and the ordinate is the paper tension. Thus, the data points corresponding to the paper tension and the cutting speed at the same acquisition moment in the two-dimensional coordinate system can be determined. According to the distribution of each data point, the fluctuation range of the paper tension at each cutting speed can be determined, and the minimum paper tension at each cutting speed can be determined according to this fluctuation range.

[0098] Step S212: Perform curve fitting on the minimum paper tensions corresponding to each adjacent two rollers at all cutting speeds to obtain a fitting curve.

[0099] Between the same adjacent two rollers, since the minimum paper tensions at some cutting speeds determined through the above steps may only be the minimum values in the current stage, the minimum paper tensions at all cutting speeds are curve-fitted to obtain a fitting curve, so as to determine the effectiveness of the minimum paper tension at the currently obtained cutting speed by analyzing the trend change in the curve, thereby realizing the correction of the invalid minimum paper tension. In some possible implementation manners, spline interpolation can be used to perform curve fitting on the minimum paper tensions at all cutting speeds.

[0100] Step S213: According to the change trend of the fitting curve and the weighted standard deviation of the paper tension corresponding to each adjacent two rollers, correct the minimum paper tensions corresponding to each adjacent two rollers at all cutting speeds to obtain the corrected minimum paper tensions corresponding to each adjacent two rollers at all cutting speeds.

[0101] Considering that the normal minimum paper tension only shows an increasing trend with the increase of the cutting speed. This is because the greater the cutting speed, the greater the friction force required, and the friction force is provided by the paper tension. Therefore, the invalid minimum paper tension can be determined according to the changing trend of the fitting curve, and the invalid minimum paper tension is corrected by using the weighted standard deviation of the paper tension, so as to obtain the effective minimum paper tension at all cutting speeds.

[0102] In some possible implementation manners, the minimum paper tension corresponding to each adjacent pair of rollers at all cutting speeds is corrected to obtain the corrected minimum paper tension corresponding to each adjacent pair of rollers at all cutting speeds. The implementation steps include:

[0103] Step S2131: Determine each maximum point in the fitting curve.

[0104] Since the slope signs on both sides of the extreme point in the fitting curve are inconsistent, the corresponding minimum paper tension does not follow the trend that the minimum paper tension increases with the increase of the cutting speed, and it is most likely to be the invalid minimum paper tension. Considering that the generation of a maximum point indicates that a lower minimum paper tension will be generated at the next cutting speed, the minimum paper tension corresponding to a slightly lower cutting speed before it is too large, so adjustment is made. The generation of a minimum point is due to an overly rapid lower limit change. Since it satisfies the consistency of the overall trend change, it is allowed. Thus, each maximum point in the fitting curve corresponding to each adjacent pair of rollers is determined.

[0105] Step S2132: Use the weighted standard deviation of the paper tension corresponding to each adjacent pair of rollers to correct the minimum paper tension corresponding to the maximum point in the fitting curve, so as to obtain the corrected minimum paper tension corresponding to each adjacent pair of rollers at all cutting speeds.

[0106] For each maximum point in the fitting curve corresponding to each adjacent pair of rollers, use the weighted standard deviation of the paper tension corresponding to the adjacent pair of rollers to correct the minimum paper tension corresponding to the maximum point, so as to obtain the corrected minimum paper tension. The corresponding calculation formula is:

[0107] ;

[0108] Wherein, represents the corrected minimum paper tension at the cutting speed corresponding to each maximum point in the fitting curve corresponding to each adjacent pair of rollers; represents the minimum paper tension at the cutting speed corresponding to each maximum point in the fitting curve corresponding to each adjacent pair of rollers; It represents the weighted standard deviation of the paper tension corresponding between every two adjacent rollers.

[0109] In the above calculation formula, for the invalid minimum paper tension at the splitting speed corresponding to each maximum point, half of the weighted standard deviation of the paper tension corresponding between two adjacent rollers is used to correct it, and finally the corrected effective minimum paper tension is obtained.

[0110] After correcting the minimum paper tension corresponding to all the maximum points in the fitting curve in the above manner, the corrected minimum paper tension and the minimum paper tension that does not need to be corrected (the minimum paper tension that does not correspond to the maximum point) together constitute the corrected minimum paper tension at all splitting speeds.

[0111] Step S214: Determine the corresponding lower limit value of the tension between every two adjacent rollers according to the corrected minimum paper tension corresponding between every two adjacent rollers at all splitting speeds, and the difference between the corrected minimum paper tension corresponding between every two adjacent rollers at all splitting speeds and the upper limit value of the tension corresponding between the two corresponding rollers.

[0112] Between every two adjacent rollers, by increasing the splitting speed, when the minimum tension value at the corresponding splitting speed approaches the maximum tension value of the paper, and considering that since the entire slitting device is an integral whole and the running speed consistency between the rollers needs to be maintained, the minimum splitting speeds corresponding between all adjacent rollers are statistically counted. Then the splitting speed at this time is the optimal high-speed splitting speed. Combining the corrected minimum paper tension corresponding between every two adjacent rollers at all splitting speeds, the corresponding optimal lower limit value of the tension between every two adjacent rollers can be determined.

[0113] In some possible implementation manners, the implementation steps for determining the corresponding lower limit value of the tension between every two adjacent rollers include:

[0114] Step S2141: Determine the corresponding reference minimum splitting speed between every two adjacent rollers according to the difference between the corrected minimum paper tension corresponding between every two adjacent rollers at all splitting speeds and the upper limit value of the tension corresponding between the two adjacent rollers.

[0115] Between two adjacent rollers, in order to measure the degree of closeness between the minimum tension value corresponding to the splitting speed and the maximum tension value of the paper as the splitting speed increases, so as to determine the splitting speed corresponding to the minimum tension value close to the maximum tension value of the paper, among the following possible implementation methods, the absolute value of the difference between the corrected minimum paper tension corresponding to all splitting speeds between every two adjacent rollers and the upper limit value of the tension corresponding to the two adjacent rollers is determined, and the splitting speed corresponding to the corrected minimum paper tension with the normalized value of the absolute value of the difference less than the set threshold is determined as the reference minimum splitting speed corresponding to every two adjacent rollers. Among them, the specific values of the normalization of the absolute value of the difference and the set threshold can be reasonably selected as needed. In some possible implementation methods, the norm function can be used to normalize the absolute value of the difference, and the value of the set threshold can be set to 0.3. Of course, in other possible implementation methods, other methods can also be used to measure the degree of closeness to determine the splitting speed corresponding to the minimum tension value close to the maximum tension value of the paper. For example, calculate the difference between the corrected minimum paper tension corresponding to all splitting speeds between every two adjacent rollers and the upper limit value of the tension corresponding to the two adjacent rollers (the difference is the latter minus the former), calculate the ratio of the difference to the upper limit value of the tension corresponding to the two adjacent rollers, and determine the splitting speed corresponding to the corrected minimum paper tension with the ratio less than the set threshold as the reference minimum splitting speed corresponding to every two adjacent rollers.

[0116] It should be understood that if the minimum tension value of the splitting speed corresponding to two adjacent rollers cannot reach a certain degree of closeness to the upper limit value of the tension corresponding to the two adjacent rollers, the maximum splitting speed corresponding to the two adjacent rollers is taken as the reference minimum splitting speed.

[0117] Step S2142: Determine the minimum value among the reference minimum splitting speeds corresponding to every two adjacent rollers, and use the corrected minimum paper tension corresponding to every two adjacent rollers at the minimum value as the lower limit value of the tension corresponding to every two adjacent rollers.

[0118] After determining the reference minimum splitting speeds corresponding to every two adjacent rollers through the above steps, determine the minimum value among all the reference minimum splitting speeds. This minimum value is the optimal high-speed splitting speed of the entire slitting device. On the fitting curve corresponding to every two adjacent rollers, determine the corrected minimum paper tension at this minimum value, and use this minimum paper tension as the lower limit value of the tension corresponding to every two adjacent rollers.

[0119] Between every two adjacent rollers, after determining the corresponding upper limit value and lower limit value of the tension between the two adjacent rollers through the above steps, calculate the average value of the upper limit value and the lower limit value of the tension, and determine this average value as the corresponding tension reference value between every two adjacent rollers. Thus, the corresponding appropriate tension reference value between every two adjacent rollers is determined.

[0120] The slitting control module is used to, during the real-time slitting process of the cut paper with the same cutting size, perform real-time control on the paper tension corresponding to every two adjacent rollers according to the difference between the real-time collected paper tension corresponding to every two adjacent rollers and the corresponding tension reference value.

[0121] After determining the corresponding appropriate tension reference value between every two adjacent rollers through the above data processing module and data processing module, use the above-mentioned slitting device provided by the embodiment of the present invention to process the digital transfer paper of a certain cutting size. During the real-time slitting process of the digital transfer paper of this cutting size during the processing, use the tension sensor 5 to collect the paper tension corresponding to every two adjacent rollers in real time. The slitting control module compares the collected paper tension with the corresponding tension reference value, and based on the difference (i.e., error) between the two, uses PID control to perform real-time control on the paper tension corresponding to every two adjacent rollers. Since this control process belongs to the prior art, it will not be elaborated here.

[0122] It should be emphasized that since the inventive point of the embodiment of the present invention lies in a high-speed slitting tension control method for digital transfer paper realized by the mutual cooperation of the above data acquisition module, data processing module, and slitting control module, that is, the steps used by the data acquisition module, data processing module, and slitting control module, therefore, this control method is not limited to the above-mentioned high-speed slitting device for digital transfer paper provided by the embodiment of the present invention, but also equally applicable to other slitting devices in the prior art that control the paper tension during the cutting process of digital transfer paper by comparing the real-time collected paper tension corresponding to every two adjacent rollers with the corresponding tension reference value and adopting a direct tension closed-loop control method.

[0123] Based on the same inventive concept, the embodiment of the present invention also provides a high-speed slitting tension control method for digital transfer paper, as Figure 4 shown, this method includes:

[0124] Obtain the paper tension data and slitting speed data corresponding to every two adjacent rollers during each historical slitting process of the cut paper, and the each historical slitting process corresponds to the same cutting size;

[0125] Determine the upper limit value of the tension corresponding to each adjacent pair of rollers according to the change of the paper tension data corresponding to each adjacent pair of rollers during each historical cutting process; determine the lower limit value of the tension corresponding to each adjacent pair of rollers according to the change of the paper tension data corresponding to each adjacent pair of rollers during each historical cutting process and the change of the paper tension data corresponding to each adjacent pair of rollers with the splitting speed data during each historical cutting process; determine the reference value of the tension corresponding to each adjacent pair of rollers according to the upper limit value and the lower limit value of the tension.

[0126] During the real-time cutting process of the cut paper with the same cutting size, perform real-time control on the paper tension corresponding to each adjacent pair of rollers according to the difference between the real-time collected paper tension corresponding to each adjacent pair of rollers and the corresponding tension reference value.

[0127] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A high-speed slitting device for digital transfer paper, characterized in that: The slitting device includes a tension control module, and the tension control module includes: A data acquisition module, used to acquire paper tension data and cutting speed data corresponding to each two adjacent rollers in each historical cutting process of the cut paper, wherein each historical cutting process corresponds to the same cutting size; The data processing module is used to determine the tension upper limit value between each two adjacent rollers according to the change of the paper tension data between all two adjacent rollers in each historical cutting process; determine the tension lower limit value between each two adjacent rollers according to the change of the paper tension data between all two adjacent rollers in each historical cutting process and the change of the paper tension data between each two adjacent rollers along with the cutting speed data in each historical cutting process; determine the tension reference value between each two adjacent rollers according to the tension upper limit value and the tension lower limit value; A cutting control module, used for controlling the paper tension between each two adjacent rollers in real time during the real-time cutting process of the cut paper of the same cutting size according to the difference between the paper tension between each two adjacent rollers collected in real time and the corresponding tension reference value; Determine the corresponding upper limit of tension between each two adjacent rollers, including: Determine the mean value of the paper tension between each two adjacent rollers according to the overall distribution level of the paper tension data between each two adjacent rollers in each historical cutting process; According to the difference of the paper tension data corresponding to each two adjacent rollers in each historical cutting process, and the difference of the paper tension data corresponding to all two adjacent rollers at the same time in each historical cutting process, the weighted standard deviation of the paper tension corresponding to each two adjacent rollers is determined; Determine the sum of the mean value of the paper tension between each two adjacent rollers and the weighted standard deviation of the paper tension, and determine the sum as the upper limit value of the tension between each two adjacent rollers; Determine the weighted standard deviation of the paper tension between each two adjacent rollers, including: Determine the average value and variance of the paper tension data corresponding to all two adjacent rollers at the same time in each historical cutting process to obtain a first average value and a first variance; Determine the variance contribution rate of each paper tension data corresponding to each two adjacent rollers in each historical cutting process according to the first variance and the difference between each paper tension data corresponding to each two adjacent rollers in each historical cutting process and the first average value; According to the difference of the paper tension data corresponding to each two adjacent rollers in each historical cutting process and the variance contribution rate of each paper tension data corresponding to each two adjacent rollers in each historical cutting process, the weighted standard deviation of the paper tension corresponding to each two adjacent rollers is determined; Determine the corresponding lower limit of tension between each two adjacent rollers, including: Determine the minimum paper tension between each two adjacent rollers at each cutting speed according to the paper tension data and cutting speed data corresponding to each two adjacent rollers in each historical cutting process; Perform curve fitting on the minimum paper tension between every two adjacent rollers at all cutting speeds to obtain a fitting curve; According to the variation trend of the fitting curve and the weighted standard deviation of the paper tension between each two adjacent rollers, the minimum paper tension between each two adjacent rollers at all cutting speeds is corrected to obtain the corrected minimum paper tension between each two adjacent rollers at all cutting speeds; The lower limit value of the tension between each two adjacent rollers is determined based on the corrected minimum paper tension between each two adjacent rollers at all cutting speeds and the difference between the corrected minimum paper tension between each two adjacent rollers at all cutting speeds and the upper limit value of the tension between the corresponding two rollers.

2. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: Determine the weighted standard deviation of the paper tension between each two adjacent rollers, including: Determine the average value of the paper tension data corresponding to each two adjacent rollers in each historical cutting process to obtain a second average value; Determine the weight of each paper tension data corresponding to each two adjacent rollers in each historical cutting process according to the variance contribution rate of each paper tension data corresponding to each two adjacent rollers in each historical cutting process; According to the weight, the standard deviation of the difference between each paper tension data corresponding to each two adjacent rollers in each historical cutting process and the second average value is weighted to calculate the standard deviation, so as to obtain the weighted standard deviation of the paper tension corresponding to each two adjacent rollers.

3. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: Determine the corresponding lower limit of tension between each two adjacent rollers, including: Determine the reference minimum slitting speed between each two adjacent rollers according to the difference between the corrected minimum paper tension between each two adjacent rollers at all slitting speeds and the tension upper limit between the corresponding two adjacent rollers; The minimum value of the reference minimum cutting speeds corresponding to each two adjacent rollers is determined, and the corrected minimum paper tension corresponding to each two adjacent rollers under the minimum value is used as the tension lower limit value corresponding to each two adjacent rollers.

4. The high-speed slitting device for digital transfer paper according to claim 3, characterized in that: Determine the reference minimum cutting speed corresponding to each two adjacent rollers, including: Determine the absolute value of the difference between the corrected minimum paper tension at all cutting speeds between each two adjacent rollers and the tension upper limit value between the corresponding two adjacent rollers, and determine the cutting speed corresponding to the corrected minimum paper tension whose normalized value of the absolute value of the difference is less than a set threshold as the reference minimum cutting speed between each two adjacent rollers.

5. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: The minimum paper tension between each two adjacent rollers at all cutting speeds is corrected to obtain the corrected minimum paper tension between each two adjacent rollers at all cutting speeds, including: Determine each maximum point in the fitting curve; The minimum paper tension corresponding to the maximum point in the fitting curve is corrected by using the weighted standard deviation of the paper tension between each two adjacent rollers to obtain the corrected minimum paper tension between each two adjacent rollers at all cutting speeds.

6. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: Determining the tension reference value corresponding to each two adjacent rollers according to the tension upper limit value and the tension lower limit value, including: The average value of the tension upper limit value and the tension lower limit value is determined as the tension reference value corresponding to each two adjacent rollers.

7. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: According to the difference between the paper tension corresponding to each two adjacent rollers collected in real time and the corresponding tension reference value, the paper tension corresponding to each two adjacent rollers is controlled in real time by using PID control.

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