High-speed slitting device for digital transfer paper

Abstract

The invention relates to the technical field of slitting devices, in particular to a digital transfer paper high-speed slitting device which comprises a tension control module, and the tension control module comprises a data acquisition module, a data processing module and a slitting control module. The method comprises the steps that corresponding paper tension data and segmentation speed data between every two adjacent rollers in each historical cutting process of cut paper are obtained, and each historical cutting process corresponds to the same cutting size; the paper tension data and the segmentation speed data are analyzed, and a corresponding tension reference value between every two adjacent rollers is determined; in the real-time cutting process of the cut paper with the same cutting size, according to the difference, collected in real time, between the corresponding paper tension between every two adjacent rollers and the corresponding tension reference value, the corresponding paper tension between every two adjacent rollers is controlled in real time. According to the method, the appropriate tension reference value is determined in a self-adaptive mode, and the paper tension control effect is effectively improved.

Description

Technical Field

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

[0002] Different paper needs have different requirements for paper size. In order to improve efficiency, the size of the manufactured paper will not be adjusted during paper manufacturing. Therefore, in order to meet the size of different paper needs, the obtained paper needs to be cut and divided. Digital transfer paper plays an important role in industrial production. When cutting, it uses a slitting device to cut a large paper roll into multiple rolls of the desired size. Since digital transfer paper requires a certain degree of precision when used, the entire roll of paper cannot be cut directly. The obtained roll of paper needs to be spread out and cut, and then the paper of different sizes is rewound after cutting.

[0003] In the prior art, when the slitting device is cutting a whole roll of digital transfer paper, the paper is stretched out by a roller, and then the stretched paper is cut into a suitable size by a rotating cutter, and finally the cut paper is rewound. Since the tension of the paper stretched out by the roller directly affects the cutting quality, when the tension is too small, the paper will be squeezed by the cutter head during cutting, and the cutting edge of the paper will not be clear, resulting in 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 paper will break due to the excessive tension between the papers. Therefore, the tension of the paper needs to be precisely controlled.

[0004] When the paper tension of digital transfer paper is traditionally controlled during the cutting process, the tension control module in the slitting device connects the magnetic powder brake to the unwinding group and realizes control through direct tension closed-loop control, that is, the detected tension is compared with the given tension. When the tension is detected to be too high, the current applied to the magnetic powder brake is reduced, the braking torque is weakened, and the unwinding speed is accelerated, thereby reducing the tension; on the contrary, when the tension is detected to be too low, the current applied to the magnetic powder brake is increased, the braking torque is enhanced, the unwinding speed is slowed down, and the tension is increased. However, in the process of realizing control through direct tension closed-loop control, in order to achieve more precise control, dynamic and static compensation is usually required, that is, the required control amount needs to be determined through an indirect control algorithm. The control process is relatively complicated and it is not easy to adapt to the paper cutting process of 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 paper tension control effect in the process of cutting digital transfer paper.

[0006] In order to solve the above technical problems, in a first aspect, the present invention provides a high-speed slitting device for digital transfer paper, wherein the slitting device comprises a tension control module, and the tension control module comprises: 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; The cutting control module is used to control 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.

[0007] In combination with the first aspect above, in some possible implementations, determining the upper limit value of the tension between every two adjacent rollers includes: 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; The sum of the mean value of the paper tension between each two adjacent rollers and the weighted standard deviation of the paper tension is determined, and the sum is determined as the upper limit value of the tension between each two adjacent rollers.

[0008] In combination with the first aspect above, in some possible implementations, determining a weighted standard deviation of paper tension corresponding to each two adjacent rollers includes: 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.

[0009] In combination with the first aspect above, in some possible implementations, determining a weighted standard deviation of paper tension corresponding to each two adjacent rollers includes: 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.

[0010] In combination with the first aspect above, in some possible implementations, determining the corresponding lower limit of the tension between every two adjacent rollers includes: 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.

[0011] In combination with the first aspect above, in some possible implementations, determining the corresponding lower limit of the tension between every two adjacent rollers includes: 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.

[0012] In combination with the first aspect above, in some possible implementations, determining the reference minimum slitting speed corresponding to each two adjacent rollers includes: 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.

[0013] In combination with the first aspect, in some possible implementations, the minimum paper tension between every two adjacent rollers at all slitting speeds is corrected to obtain the corrected minimum paper tension between every two adjacent rollers at all slitting 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.

[0014] In combination with the first aspect above, in some possible implementations, determining a tension reference value corresponding to each two adjacent rollers according to the tension upper limit value and the tension lower limit value includes: 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.

[0015] In combination with the first aspect above, in some possible implementations, PID control is used to control the paper tension corresponding to each two adjacent rollers in real time based on the difference between the paper tension corresponding to each two adjacent rollers collected in real time and the corresponding tension reference value.

[0016] In order to solve the above technical problems, in a second aspect, the present invention also provides a method for controlling the tension of high-speed slitting of digital transfer paper, the method comprising: 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; According to the change of the paper tension data between all two adjacent rollers in each historical cutting process, the upper limit value of the tension between each two adjacent rollers is determined; 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, the lower limit value of the tension between each two adjacent rollers is determined; according to the upper limit value and the lower limit value of the tension, the reference value of the tension between each two adjacent rollers is determined; In the real-time cutting process of cutting paper of the same cutting size, the paper tension between each two adjacent rollers is controlled in real time according to the difference between the paper tension between each two adjacent rollers collected in real time and the corresponding tension reference value.

[0017] The present invention has the following beneficial effects: when processing a cut paper of a certain cutting size, firstly, the paper tension data and cutting speed data corresponding to each adjacent two rollers of the cut paper corresponding to the cutting size in each historical cutting process are obtained. Since the tension ranges that digital transfer paper of different sizes can bear are different, the change of the paper tension data corresponding to each adjacent two rollers in each historical cutting process under the same cutting size is analyzed, and the upper limit value of the tension corresponding to each adjacent two rollers can be determined. Considering that the speed of the paper cutting device when working will also affect the change of the required minimum tension between the papers, fast cutting requires greater tension to ensure that the paper does not deviate and slip during the cutting process, but does not affect the maximum required tension of the paper, thus, the change of the paper tension data corresponding to each adjacent two rollers in each historical cutting process can be combined with the change of the paper tension data corresponding to each adjacent two rollers in each historical cutting process, and the change of the paper tension data corresponding to each adjacent two rollers in each historical cutting process with the cutting speed data is analyzed, so as to determine the lower limit value of the tension corresponding to each adjacent two rollers. According to the upper limit value and the lower limit value of the tension, the tension reference value corresponding to each adjacent two rollers can be determined. In the process of processing the cut paper of a certain cutting size, the paper tension corresponding to each two adjacent rollers is controlled in real time according to the difference between the paper tension corresponding to each two adjacent rollers collected in real time and the corresponding tension reference value, so as to improve the control reliability. The present invention analyzes the paper tension data and cutting speed data corresponding to each two adjacent rollers of the cut paper of a certain cutting size in each historical cutting process, adaptively determines the appropriate tension reference value, and then in the process of processing the cut paper of a certain cutting size in real time, directly controls the paper tension corresponding to each two adjacent rollers in real time, without other compensation, and is adapted to the paper cutting process of different cutting sizes, effectively improving the paper tension control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the first axis side of a high-speed slitting device for digital transfer paper according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the second axis side of a high-speed slitting device for digital transfer paper according to an embodiment of the present invention; Figure 3A schematic diagram of the structure of a tension control module according to an embodiment of the present invention; Figure 4 A flowchart of the steps of a method for controlling the high-speed slitting tension of digital transfer paper according to an embodiment of the present invention; Among them: 1 represents the supporting structure; 2 represents the unwinding module; 3 represents the slitting module; 4 represents the guiding module; 5 represents the tension sensor in the tension control module; 6 represents the winding module; 7 represents the magnetic powder brake in the tension control module. DETAILED DESCRIPTION

[0020] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0021] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0022] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders 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 respect.

[0023] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0024] 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 or interdependence of the functions performed by these devices, modules or units.

[0025] Although operations or steps are described in a specific order in the drawings in the embodiments of the present invention, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or that all the operations or steps shown must be performed to obtain the desired results. In the embodiments of the present invention, these operations or steps may be performed in series; these operations or steps may also be performed in parallel; or some of these operations or steps may be performed.

[0026] At the same time, it is 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 the data) shall comply with the requirements of the relevant laws, regulations and relevant provisions. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by technicians in the technical field of the present invention, and all parameters or indicators in the formulas involved in the present invention are normalized values ​​that eliminate the influence of dimensions.

[0027] In order to solve the problem of poor paper tension control effect 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, which analyzes the paper tension data and slitting speed data corresponding to each two adjacent rollers in each historical cutting process of the cut paper of a certain cutting size, and adaptively determines the appropriate tension reference value corresponding to each two adjacent rollers. Then, in the real-time processing process of the cut paper of the certain cutting size, according to the difference between the corresponding paper tension between each two adjacent rollers collected in real time and the corresponding tension reference value, the corresponding paper tension between each two adjacent rollers is directly controlled in real time without other compensation, and is suitable for the paper cutting process of different cutting sizes, thereby effectively improving the paper tension control effect.

[0028] A digital transfer paper high-speed slitting device provided by an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] The embodiment of the present invention provides a high-speed slitting device for digital transfer paper. Figure 1 and Figure 2 The first axial side schematic diagram and the second axial side schematic diagram of the slitting device provided by the embodiment of the present invention are respectively shown. Figure 1 and Figure 2 As shown, the slitting device is mainly composed 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: The supporting structure 1 serves as a skeleton supporting the entire slitting device, and its main function is to provide support for the entire slitting device body.

[0030] The unwinding module 2 is responsible for smoothly unrolling the large roll of digital transfer paper raw material paper. This is achieved by putting the paper roll in a sleeve. There is a motor in the sleeve to drive the paper roll to rotate, and the paper is squeezed and laid flat by two rollers. The slitting module 3 is responsible for cutting the unfolded digital transfer paper raw material paper into several strips according to a predetermined width. This is achieved by cutting the paper vertically by a rotating cutting head. The position of the cutting head can be controlled by a stepping motor to facilitate left and right movement to adjust the cutting size. The slitting module 3 is usually equipped with precision blades and cutting mechanisms to ensure that the cutting edges are neat and burr-free. 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 deviate during the slitting and winding process. As the control device of the slitting module 3, the tension control module is mainly responsible for maintaining a constant tension of the digital transfer paper raw material paper during the entire processing process. This is achieved as follows Figure 1 and Figure 2 As shown, by setting tension sensors 5 on the end shafts on both sides of the guide roller, the corresponding paper tension data between each two adjacent rollers is collected during the cutting process of the digital transfer paper raw material paper by the slitting module 3 in the above-mentioned slitting device, and the magnetic powder brake 7 is connected to the air shaft through a transmission member, so that the magnetic powder brake 7 is connected to the unwinding group, and the torque of the unwinding group of the slitting machine is controlled by 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.

[0031] In view of the fact that in the prior art, when the slitting device is working, its tension control module controls the paper tension during the cutting process of the digital transfer paper. In order to achieve more precise control, dynamic and static compensation is usually required, that is, the required control amount needs to be determined through an indirect control algorithm. The control process is relatively complicated and it is not easy to adapt to the paper cutting process of multiple different cutting sizes. The paper tension control effect is poor. The above-mentioned digital transfer paper high-speed slitting device provided by the embodiment of the present invention collects the paper tension data corresponding to each adjacent two 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 obtains the cutting speed data corresponding to each adjacent two rollers in each historical cutting process. By analyzing these paper tension data and cutting speed data, the tension reference value corresponding to each adjacent two rollers is adaptively determined. Then, in the real-time cutting process of the cut paper of the same cutting size, according to the difference between the corresponding paper tension between each adjacent two rollers collected in real time and the corresponding tension reference value, the paper tension corresponding to each adjacent two rollers is accurately controlled in real time, thereby improving the paper tension control effect.

[0032] In order to realize the above control process, Figure 3 As shown, the tension control module of the digital transfer paper high-speed slitting device provided in the embodiment of the present invention is divided into functional modules 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 storage device, 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 the 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, and their core is to realize a digital transfer paper high-speed slitting tension control method. The corresponding flowchart of the method is shown in the figure below. Figure 4 In combination with the specific steps in the method, the various modules divided from the tension control module of the digital transfer paper high-speed slitting device provided by the embodiment of the present invention are introduced in detail below.

[0033] The data acquisition module is used to acquire the 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.

[0034] When the slitting device provided by the embodiment of the present invention is used to process a digital transfer paper of a certain cutting size, firstly, the paper tension data and cutting speed data corresponding to each adjacent two rollers in each historical cutting process of the cutting paper of the same cutting size being processed by the slitting device are obtained. Among them, the paper tension data is acquired by the tension sensor in the tension control module of the slitting device in each historical cutting process, and the acquired 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 be acquired synchronously. At the same time, the cutting speed data (i.e., the rotation speed of the paper) corresponding to each adjacent two rollers in each historical cutting process is synchronously acquired by using the rotation speed sensor, and the acquired cutting speed data is stored in the data acquisition module of the tension control module of the slitting device.

[0035] The data processing module is used to determine the tension upper limit value corresponding to each two adjacent rollers according to the change of the paper tension data corresponding to each two adjacent rollers in each historical cutting process; determine the tension lower limit value corresponding to each two adjacent rollers according to the change of the paper tension data corresponding to each two adjacent rollers in each historical cutting process and the change of the paper tension data corresponding to each two adjacent rollers along with the cutting speed data in each historical cutting process; determine the tension reference value corresponding to each two adjacent rollers according to the tension upper limit value and the tension lower limit value.

[0036] Digital transfer papers of different sizes can withstand different tension ranges. Based on the changes in the corresponding paper tension data between all two adjacent rollers in each historical cutting process under the same cutting size, the mean and standard deviation of the paper tension data are analyzed to determine the upper limit of the tension between each two adjacent rollers.

[0037] In some possible implementations, determining the upper limit value of the tension between every two adjacent rollers includes: Step S201: determining 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.

[0038] Between the same two adjacent rollers, the average value of the paper tension data corresponding to each historical cutting process is calculated to obtain the paper tension mean value, which represents the overall distribution level of all paper tension data between the same two adjacent rollers. In other possible implementations, the median or mode of the paper tension data corresponding to each historical cutting process can also be determined to obtain the paper tension mean value.

[0039] Step S202: Determine the weighted standard deviation of the paper tension between each two adjacent rollers according to the difference of the paper tension data between each two adjacent rollers in each historical cutting process and the difference of the paper tension data between all two adjacent rollers at the same time in each historical cutting process.

[0040] On the basis of knowing the mean value of the paper tension corresponding to each two adjacent rollers, and then according to the difference of the paper tension data corresponding to each two adjacent rollers in each historical cutting process, the standard deviation of the paper tension data corresponding to each two adjacent rollers in each historical cutting process is determined, and the tension upper limit value can be determined based on the paper tension mean and standard deviation. However, considering that the credibility of different paper tension data is different due to the influence of different positions, in order to more accurately determine the tension upper limit value, it is necessary to combine the difference of the paper tension data corresponding to all two adjacent rollers at the same time in each historical cutting process, and correct the process of obtaining the standard deviation, so as to obtain the weighted standard deviation of the paper tension, and determine the tension upper limit value based on the paper tension mean and the paper tension weighted standard deviation.

[0041] In some possible implementations, determining the weighted standard deviation of the paper tension between every two adjacent rollers includes the following steps: Step S2021: 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, and obtain a first average value and a first variance.

[0042] In each historical cutting process, for the paper tension data corresponding to two different adjacent rollers at the same time t, the corresponding average value and variance are obtained, thereby obtaining a first average value and a first variance.

[0043] Step S2022: 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.

[0044] In each historical cutting process, for the paper tension data corresponding to two different adjacent rollers at the same time t, the variance contribution rate corresponding to any paper tension data is calculated, and the corresponding calculation formula is: ; in, represents the variance contribution rate of the zth paper tension data among the paper tension data corresponding to the same time t between two different adjacent rollers; represents the zth paper tension data among the paper tension data corresponding to the same time t between two different adjacent rollers; represents the average value of the paper tension data corresponding to the same time t between two different adjacent rollers, that is, the first average value; It represents the variance of the paper tension data corresponding to two different adjacent rollers at the same time t, that is, the first variance.

[0045] In the above calculation formula, the larger the variance contribution rate is, the more outliers the z-th paper tension data is among all paper tension data corresponding to the same time t, and the lower its corresponding credibility is.

[0046] Step S2023: Determine the weighted standard deviation of the paper tension between each two adjacent rollers according to the difference of the paper tension data between each two adjacent rollers in each historical cutting process and the variance contribution rate of each paper tension data between each two adjacent rollers in each historical cutting process.

[0047] Based on the differences in the paper tension data corresponding to each two adjacent rollers in each historical cutting process, the standard deviation of the paper tension corresponding to each two adjacent rollers can be calculated. However, considering the different credibility of different paper tension data, it is necessary to correct the process of calculating the paper tension standard deviation according to the variance contribution rate of each paper tension data to obtain the corresponding paper tension weighted standard deviation.

[0048] In some possible implementations, determining the weighted standard deviation of the paper tension between every two adjacent rollers includes the following steps: Step S20231: 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.

[0049] Between the same two adjacent rollers, the average value of all paper tension data obtained in each historical cutting process is calculated to obtain the second average value. In other possible implementations, the median or mode of all paper tension data obtained in each historical cutting process can also be determined to obtain the second average value.

[0050] Step S20232: 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.

[0051] Since the larger the variance contribution rate is, the lower the credibility of the corresponding paper tension data between two adjacent rollers at the same time is, the smaller the corresponding weight of the corresponding paper tension data when participating in the standard deviation calculation should be.

[0052] Step S20233: According to the weight, weighted standard deviation is calculated for the difference between each paper tension data corresponding to each 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 each two adjacent rollers.

[0053] Between the same two adjacent rollers, based on the weight of each paper tension data in each historical cutting process, the difference between the paper tension data and the second average value is weighted to calculate the standard deviation, so as to obtain the corresponding paper tension weighted standard deviation. The corresponding calculation formula is: ; in, It represents the weighted standard deviation of the paper tension between every two adjacent rollers; Indicates the nth paper tension data corresponding to each adjacent two rollers in each historical cutting process; Indicates the average value of the paper tension data corresponding to each two adjacent rollers in each historical cutting process, that is, the second average value; It represents the variance contribution rate of the nth paper tension data between each two adjacent rollers in each historical cutting process; Indicates the weight of the nth paper tension data corresponding to each adjacent two rollers in each historical cutting process; It represents the exponential function with the natural constant e as the base; Indicates the total number of paper tension data corresponding to each two adjacent rollers in each historical cutting process.

[0054] In the above calculation formula, the variance contribution rate of the nth paper tension data between each two adjacent rollers is negatively normalized by using an exponential function with the natural constant e as the base, so as to obtain the corresponding weight value: , using this weight The difference between the nth paper tension data and the second average value The weighted standard deviation of the paper tension is obtained by weighting, which effectively improves the accuracy of the obtained standard deviation.

[0055] Step S203: determining 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 determining the sum as the upper limit value of the tension between each two adjacent rollers.

[0056] The mean value of the paper tension between each two adjacent rollers and the weighted standard deviation of the paper tension are added together, and the resulting added value is the upper limit value of the tension between each two adjacent rollers.

[0057] Taking into account that the speed at which the slitting device cuts paper during operation will also affect the change in the minimum required tension between the papers, faster cutting requires greater tension to ensure that the paper does not deviate or slip during the cutting process (sliding friction is generated 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 two adjacent rollers in each historical cutting process can be combined, and the change in the paper tension data corresponding to each two adjacent rollers in each historical cutting process along with the cutting speed data can be analyzed, so as to determine the lower limit value of the tension corresponding to each two adjacent rollers.

[0058] In some possible implementations, determining the corresponding lower limit of tension between every two adjacent rollers includes the following steps: Step S211: determining 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.

[0059] Between the same two adjacent rollers, a two-dimensional coordinate system is constructed according to the paper tension data and cutting speed data obtained in each historical cutting process. The horizontal axis of the two-dimensional coordinate system is the cutting speed, and the vertical axis is the paper tension. In this way, the data points corresponding to the paper tension and cutting speed at the same acquisition time 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 based on the fluctuation range.

[0060] Step S212: performing curve fitting on the minimum paper tension between every two adjacent rollers at all cutting speeds to obtain a fitting curve.

[0061] Between the same two adjacent rollers, since the minimum paper tension at some cutting speeds determined by the above steps may only be the minimum value at the current stage, a curve fitting is performed on the minimum paper tension at all cutting speeds to obtain a fitting curve, so as to determine the effectiveness of the minimum paper tension at the current cutting speed obtained by analyzing the trend change in the curve, thereby correcting the invalid minimum paper tension. In some possible implementations, a spline interpolation method can be used to perform curve fitting on the minimum paper tension at all cutting speeds.

[0062] Step S213: 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.

[0063] Considering that the normal minimum paper tension will only increase with the increase of the cutting speed, this is because the greater the cutting speed, the greater the friction required, and the friction 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 can be corrected using the weighted standard deviation of the paper tension, so as to obtain the effective minimum paper tension at all cutting speeds.

[0064] In some possible implementations, the minimum paper tension between every two adjacent rollers at all cutting speeds is corrected to obtain the corrected minimum paper tension between every two adjacent rollers at all cutting speeds. The implementation steps include: Step S2131: determine each maximum point in the fitting curve.

[0065] 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 will increase with the increase of the cutting speed, and it is most likely an invalid minimum paper tension. Considering that the generation of the maximum point indicates that the next cutting speed will produce a lower minimum paper tension, the minimum paper tension corresponding to the previous smaller cutting speed is too large, so it is adjusted. The minimum point is generated due to the excessively fast lower limit change, which is allowed because it meets the consistency of the overall trend change. Thus, the maximum points in the fitting curve corresponding to each adjacent two rollers are determined.

[0066] Step S2132: using the weighted standard deviation of the paper tension between every two adjacent rollers, the minimum paper tension corresponding to the maximum point in the fitting curve is corrected to obtain the corrected minimum paper tension between every two adjacent rollers at all cutting speeds.

[0067] For each maximum point in the fitting curve corresponding to each two adjacent rollers, the minimum paper tension corresponding to the maximum point is corrected using the weighted standard deviation of the paper tension corresponding to the two adjacent rollers, so as to obtain the corrected minimum paper tension. The corresponding calculation formula is: ; in, Indicates the corrected minimum paper tension at the cutting speed corresponding to each maximum point in the fitting curve corresponding to each two adjacent rollers; Indicates the minimum paper tension at the cutting speed corresponding to each maximum point in the fitting curve corresponding to each two adjacent rollers; Represents the weighted standard deviation of the paper tension between every two adjacent rollers.

[0068] In the above calculation formula, for the invalid minimum paper tension at the cutting speed corresponding to each maximum point, half of the weighted standard deviation of the paper tension between two adjacent rollers is used. It is corrected and finally the corrected effective minimum paper tension is obtained.

[0069] 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 cutting speeds.

[0070] Step S214: Determine the tension lower limit value between each two adjacent rollers according to the corrected minimum paper tension between each two adjacent rollers at all slitting speeds and the difference between the corrected minimum paper tension between each two adjacent rollers at all slitting speeds and the tension upper limit value between the corresponding two rollers.

[0071] By increasing the slitting speed between every two adjacent rollers, when the minimum tension value corresponding to the slitting speed is close to the maximum tension value of the paper, and considering that the entire slitting device is a whole, it is necessary to maintain the consistency of the running speeds between the rollers, the minimum slitting speeds corresponding to all two adjacent rollers are counted, and the slitting speed at this time is the optimal high-speed slitting speed. Combined with the corrected minimum paper tension corresponding to all slitting speeds between every two adjacent rollers, the optimal tension lower limit value corresponding to each two adjacent rollers can be determined.

[0072] In some possible implementations, determining the corresponding lower limit of tension between every two adjacent rollers includes the following steps: Step S2141: Determine a 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.

[0073] Between the same two adjacent rollers, in order to measure the closeness of the minimum tension value corresponding to the slitting speed to the maximum tension value of the paper as the slitting speed increases, and thus determine the slitting speed corresponding to the minimum tension value close to the maximum tension value of the paper, in the following possible implementations, the absolute value of the difference between the corrected minimum paper tension at all slitting speeds corresponding to each two adjacent rollers and the corresponding tension upper limit value between the corresponding two adjacent rollers is determined, and 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 is determined as the reference minimum slitting speed corresponding to each two adjacent rollers. Among them, the normalization of the absolute value of the difference and the specific value of the set threshold can be reasonably selected according to needs. In some possible implementations, the norm function can be used to normalize the absolute value of the difference, and the value of the set threshold is set to 0.3. Of course, in other possible implementations, other methods can be used to measure the degree of proximity so as to determine the slitting speed corresponding to the minimum tension value close to the maximum tension value of the paper, such as calculating the difference between the corrected minimum paper tension at all slitting speeds between each two adjacent rollers and the tension upper limit value between the corresponding two adjacent rollers (the difference is the latter minus the former), and calculating the ratio of the difference to the tension upper limit value between the corresponding two adjacent rollers, and determining the slitting speed corresponding to the corrected minimum paper tension whose ratio is less than a set threshold as the reference minimum slitting speed between each two adjacent rollers.

[0074] It should be understood that if the minimum tension value of the slitting 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 slitting speed corresponding to the two adjacent rollers is taken as the reference minimum slitting speed.

[0075] Step S2142: Determine the minimum value of the reference minimum cutting speeds corresponding to each two adjacent rollers, and use the corrected minimum paper tension corresponding to each two adjacent rollers under the minimum value as the tension lower limit corresponding to each two adjacent rollers.

[0076] After determining the reference minimum slitting speed corresponding to each two adjacent rollers through the above steps, determine the minimum value of all the reference minimum slitting speeds, and the minimum value is the optimal high-speed slitting speed of the entire slitting device. On the fitting curve corresponding to each two adjacent rollers, determine the corrected minimum paper tension at the minimum value, and use the minimum paper tension as the tension lower limit corresponding to each two adjacent rollers.

[0077] Between each two adjacent rollers, after the tension upper limit value and the tension lower limit value corresponding to the two adjacent rollers are determined through the above steps, the average value of the tension upper limit value and the tension lower limit value is calculated, and the average value is determined as the tension reference value corresponding to the two adjacent rollers. Thus, the appropriate tension reference value corresponding to the two adjacent rollers is determined.

[0078] The cutting control module is used to control 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.

[0079] After the appropriate tension reference value corresponding to each two adjacent rollers is determined by the above-mentioned data processing module and the data processing module, the digital transfer paper of a certain cutting size is processed by the above-mentioned slitting device provided by the embodiment of the present invention. During the process of real-time cutting of the digital transfer paper of the cutting size, the tension sensor 5 is used to collect the corresponding paper tension between each two adjacent rollers in real time. The slitting control module compares the collected paper tension with the corresponding tension reference value. Based on the difference (i.e., error) between the two, PID control is used to control the corresponding paper tension between each two adjacent rollers in real time. Since this control process belongs to the prior art, it will not be described here.

[0080] It should be emphasized that since the inventive point of the embodiment of the present invention lies in a digital transfer paper high-speed slitting tension control method implemented by the cooperation of the above-mentioned data acquisition module, data processing module and slitting control module, that is, the steps implemented by the data acquisition module, data processing module and slitting control module, the control method is not limited to the above-mentioned digital transfer paper high-speed slitting device provided in the embodiment of the present invention, but is also applicable to other slitting devices in the prior art that control the paper tension during the cutting process of the digital transfer paper by comparing the corresponding paper tension between each two adjacent rollers collected in real time with the corresponding tension reference value and adopting a direct tension closed-loop control method.

[0081] Based on the same inventive concept, the embodiment of the present invention also provides a method for controlling the tension of high-speed slitting of digital transfer paper, such as Figure 4 As shown, the method includes: 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; According to the change of the paper tension data between all two adjacent rollers in each historical cutting process, the upper limit value of the tension between each two adjacent rollers is determined; 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, the lower limit value of the tension between each two adjacent rollers is determined; according to the upper limit value and the lower limit value of the tension, the reference value of the tension between each two adjacent rollers is determined; In the real-time cutting process of cutting paper of the same cutting size, the paper tension between each two adjacent rollers is controlled in real time according to the difference between the paper tension between each two adjacent rollers collected in real time and the corresponding tension reference value.

[0082] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions 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.

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 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.

4. The high-speed slitting device for digital transfer paper according to claim 3, 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.

5. The high-speed slitting device for digital transfer paper according to claim 4, 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.

6. The high-speed slitting device for digital transfer paper according to claim 3, 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.

7. The high-speed slitting device for digital transfer paper according to claim 1, characterized in that: Determining a 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.

8. 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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