JP2022025256A - Automatic slack correction system for paper machine - Google Patents

Abstract

To provide an automatic slack correction system for paper machine that automatically corrects a slack of paper without any operator's manual operation.SOLUTION: A system according to an embodiment is placed in operation while first to third operation modes are changed in order. The system comprises a control controller which controls a drive device, and a data gathering device which gathers image data acquired by a camera taking images of carried paper. In the first operation mode, the control controller supplies a new second control signal, generated through operation between a correction quantity by an operation signal and a first control signal for controlling the drive device, to the drive device. The data gathering device gathers time-series data of the operation signal and the second control signal from the control controller, gathers and time-synchronizes image data in a state of paper with the time-series data, and generates digitized data digitized by performing image processing on the image data.SELECTED DRAWING: Figure 2

Description

An embodiment of the present invention relates to an automatic slack correction system for a paper machine.

It may not be possible to install a tension detector depending on the part or location of the paper machine. Paper slack in the absence of a tension detector is adjusted by manual intervention by the operator. In manual intervention, the operator visually checks the condition of the paper based on his own experience (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 6-255851

Adjustment of slack by manual intervention is an operation that relies on the operator's senses, so it is difficult to pass on the technology. In addition, in a control system premised on manual intervention, it is necessary to constantly monitor the operator, which increases the work burden on the operator, but at the same time, it is difficult to secure replacement personnel.

It is an object of the present invention to provide an automatic slack correction system for a paper machine that automatically corrects slack in paper without a manual operation by an operator.

The automatic slack correction system of the paper machine according to the embodiment of the present invention is operated by sequentially switching between the first operation mode, the second operation mode, and the third operation mode. This automatic slack correction system is connected to a control controller provided to control a drive device for driving a motor of a roll that conveys paper, and the control controller, and captures an image of the paper conveyed by the roll. A data collecting device for collecting image data acquired by a camera is provided. In the first operation mode, the control controller is a new second generated by the calculation of the correction amount generated based on the operation signal generated by the operation of the operator and the first control signal for controlling the drive device. The control signal is supplied to the drive device, and the data acquisition device collects the first time-series data of the operation signal and the second time-series data of the second control signal from the control controller and acquires them by the camera. The collected image data is collected to generate a third time-series data in time synchronization with the first time-series data and the second time-series data, and each of the third time-series data is image-processed and digitized. Generate the 4th time series data of the digitized data. In the second operation mode following the first operation mode, the control controller is based on the first time series data, the second time series data, the third time series data, and the fourth time series data. An approximate expression representing the relationship between the second time-series data and the fourth time-series data is calculated. In the third operation mode following the second operation mode, the data acquisition device processes new image data of paper by the camera to generate new digitized data, and the control controller uses the new operation mode. A third control signal is generated based on the data of the new control signal output by inputting the numerical data into the approximate expression and supplied to the drive device.

In the present embodiment, an automatic slack correction system for a paper machine that automatically corrects slack in paper is realized without the need for manual operation by an operator.

It is a schematic block diagram which illustrates the automatic slack correction apparatus of the paper machine which concerns on embodiment. It is a schematic block diagram which illustrates the automatic slack correction apparatus of the paper machine which concerns on embodiment. This is an example of a schematic operation waveform for explaining the operation of the automatic slack correction device of the paper machine of the embodiment. FIG. 4A is an example of image data in a shooting region from the side and above. FIG. 4B is a schematic enlarged view of part A of FIG. 4A. FIG. 4C is an example of a state in which slack is generated in the image data in the photographing region from the side and the upper side. 5 (a) and 5 (b) are examples of quality comparison of paper image data. FIG. 5C is an example of a correction time approximation formula and a correction amount approximation formula generated by the automatic slack correction device of the paper machine.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
It should be noted that the drawings are schematic or conceptual, and the relationship between the thickness and width of each part, the ratio of the sizes between the parts, and the like are not necessarily the same as the actual ones. Further, even when the same part is represented, the dimensions and ratios may be different from each other depending on the drawing.
In addition, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures are designated by the same reference numerals, and detailed description thereof will be omitted as appropriate.

FIG. 1 is a schematic block diagram illustrating an automatic slack correction device for a paper machine according to an embodiment.
FIG. 1 shows the configuration of the paper machine 100 as a whole, in addition to the automatic slack correction system 110 of the paper machine (hereinafter, simply referred to as an automatic slack correction system) 110.
As shown in FIG. 1, the automatic slack correction system 110 of the embodiment includes a data acquisition device 2 and a control controller 10. The automatic slack correction system 110 is connected to a drive device (not shown) of the cameras 1a and 1b, rolls 5a and 5b, and an operation panel 3.

The rolls 5a and 5b are connected to a motor (not shown) for driving the rolls 5a and 5b, and the motors are driven by a drive device, respectively. The automatic slack correction system 110 is connected to the rolls 5a and 5b via a drive device and a motor. Paper 6 is provided between the rolls 5a and 5b, and the paper 6 is conveyed by the speed-controlled rolls 5a and 5b, for example, while maintaining a desired tension.

The cameras 1a and 1b are provided so as to photograph the paper 6 conveyed between the rolls 5a and 5b. The camera 1a is provided above the paper 6 so as to photograph the photographing area SVa on the upper surface of the paper 6. The camera 1b is provided on the side of the paper 6 so as to shoot the shooting area SVb from the side of the paper 6.

The photographing areas SVa and SVb are set, for example, based on the range in which the operator can visually check the slack state of the conveyed paper 6. In order to quantify the slack of the paper 6 more accurately, it is preferable to set it in a wider range, but as will be described later, from the viewpoint of reducing the calculation processing load when quantifying it, a narrower range is used. Is set to.

The automatic slack correction system 110 acquires image data of the upper surface and the side surface of the paper 6 taken by the cameras 1a and 1b.

The automatic slack correction system 110 acquires data such as the speeds of the rolls 5a and 5b from the drive device. The automatic slack correction system 110 generates, for example, a speed command value for the drive device based on data obtained from the drive device and drives the paper 6 so that the tension of the paper 6 between the rolls 5a and 5b becomes a desired value. Supply to the device. The signal transmitted to and received from the drive device by the automatic slack correction system 110 is called a control signal, and the control signal includes a speed signal including actually measured speed data, a speed command value, and the like.

The operation panel 3 is operated by the operator and generates a signal corresponding to the operation. The generated signal is transmitted to the automatic slack correction system 110 as an operation signal. For example, the operator visually observes a state such as slack of the paper 6 conveyed between the rolls 5a and 5b, and operates the operation panel 3 so as to be in an appropriate state.

The automatic slack correction system 110 of the embodiment has a plurality of operation modes. The plurality of operation modes are a manual data acquisition mode, a correction amount data generation mode, and an automatic operation mode. The automatic slack correction system 110 operates by switching the operation mode in the order of the manual data acquisition mode, the correction amount data generation mode, and the automatic operation mode.

In the manual data acquisition mode (first operation mode), the automatic slack correction system 110 collects data during the period during which the operation signal generated by the operation panel 3 is being received. This period may be referred to as the manual data collection period.

The automatic slack correction system 110 collects time-series data of operation signals (first time-series data) and time-series data of control signals (second time-series data) during the manual data collection period. The automatic slack correction system 110 collects image data of the photographing areas SVa and SVb during the manual data collection period, and synchronizes the collected image data (third time-series data) with time-series data such as an operation signal. The automatic slack correction system 110 generates digitized data (fourth time-series data) of the brightness information of the two-dimensional mesh by performing image processing on the time-synchronized image data during the manual data collection period.

The automatic slack correction system 110 stores time-synchronized operation signals, control signals, image data, and digitized data in a database.

In the correction amount data generation mode (second operation mode), the automatic slack correction system 110 extracts the relationship between the operation signal, the control signal, and the digitized data in the manual data acquisition period. Specifically, the automatic slack correction system 110 has a preset threshold value (first threshold value) for the quantified data, and calculates the deviation between the quantified data and the threshold value. The automatic slack correction system 110 calculates an approximate expression (correction time approximate expression) that expresses the relationship between the correction time and the deviation by the operation signal and an approximate expression (correction amount approximate expression) that expresses the relationship between the correction amount and the deviation with respect to the control signal. And set.

In the automatic operation mode (third operation mode), the automatic slack correction system 110 corrects the control signal based on the approximate expression generated in the correction amount data generation mode, and the paper machine 100 is operated. More specifically, the automatic slack correction system 110 generates digitized data from image data taken by the cameras 1a and 1b. The automatic slack correction system 110 inputs the deviation between the generated quantified data and the threshold value into the correction time approximation formula and the correction amount approximation formula, and applies the calculated correction amount of the control signal over the calculated correction time.

In this way, the automatic slack correction system 110 automatically adjusts the slack of the paper 6 without the manual intervention of the operator.

The configuration of the automatic slack correction system 110 will be described in more detail.
As shown in FIG. 2, in the automatic slack correction system 110, the data acquisition device 2 and the control controller 10 are connected to each other.

The data collection device 2 includes a data collection unit 21, an image processing unit 22, and a storage unit 23. The data acquisition unit 21 receives an operation signal, a control signal, and image data via the control controller 10. During the manual data collection period, the data collection unit 21 receives these signals and the like. The manual data acquisition period starts at the timing when the operation signal transitions to active, and ends at the timing when the operation signal transitions to inactive.

The operation signal and the control signal are time series data associated with the time data. The data collection unit 21 synchronizes the operation signal, the control signal, and the image data with the time of the operation signal and the control signal, which are time-series data, by associating the shooting time of the image data with the time.

The image processing unit 22 performs image processing on the time-synchronized image data to quantify the brightness information on the upper surface and the side surface of the paper 6. The brightness information is quantified by moving averaging the brightness data in the two-dimensional mesh, as will be described later.

In the manual data acquisition mode, the image processing unit 22 stores the generated digitized data in the database of the storage unit 23. In the automatic operation mode, the image processing unit 22 transmits the generated digitized data to the correction amount extraction unit 14 of the control controller 10.

The storage unit 23 stores the database. The database stores time-series data of operation signals collected by the data collection unit 21, time-series data of control signals, image data synchronized with the time-series data, and digitized data generated by the image data. The paper 6 manufactured by the paper machine 100 is stored in a database, for example, associated with a product identification number for each product. The control controller 10 can extract time-synchronized data about the product from the database by designating the product identification number.

The control controller 10 is connected to the cameras 1a and 1b, the drive device 40, the display 18, and the operation equipment 31 via the communication network 120. The communication network 120 is, for example, a control system communication network, and the constant periodicity of data to be transmitted / received is guaranteed.

The operation product 31 is a product that generates an operation signal by the operation of the operator. The operation product 31 is, for example, a button switch provided on the operation panel 3. When the operator presses the button switch, the operation signal becomes active, and the active state of the operation signal is maintained for the period during which the button switch is pressed.

The display 18 displays the output from the control controller 10. For example, the control controller 10 can generate an alarm output and transmit the alarm output to the display 18 when an abnormal slack in the paper 6 is detected. The display 18 displays, for example, a text indicating that the slack state is abnormal on the screen in response to the alarm output. Further, the display 18 may display the image data read from the database of the data acquisition device 2 by the control controller 10. It can be used when sequentially reading image data from a database, outputting it to a display 18, and visually setting a criterion for determining whether or not the slack state of the paper 6 is good or bad.

The control controller 10 receives an operation signal from the operation equipment 31 and a speed signal from the drive device 40 via the communication network 120. The control controller 10 generates a speed command value for the drive device 40 based on the operation signal and the speed signal. In this example, the control controller 10 generates a correction amount so as to increase the speed command value when the operation signal is activated, adds the correction amount to the speed command value, and sets the drive device 40 as a new speed command value. Supply to.

The control controller 10 receives the image data of the paper 6 taken by the cameras 1a and 1b via the communication network 120. The control controller 10 transmits the received image data to the data acquisition device 2.

In the manual data acquisition mode, the control controller 10 transmits the acquired operation signal, control signal, and image data to the data acquisition device 2. In the correction amount data generation mode, the control controller 10 reads the data collected in the manual data collection mode from the data collection device 2, generates and sets a correction time approximation formula and a correction amount approximation formula. In the automatic operation mode, the control controller 10 inputs the deviation between the numerical value data generated using the image data constantly acquired and the threshold value into the correction time approximation formula and the correction amount approximation formula, and outputs the correction amount. Is added to the speed command value and transmitted to the drive device 40 over the output correction time.

The control controller 10 includes a calculation unit 12, a correction amount extraction unit 14, and a correction pattern analysis unit 16. The arithmetic unit 12 executes transmission / reception of operation signals, control signals, and image data via the communication network 120. The arithmetic unit 12 executes transmission / reception of data via the communication network 120 according to a control program stored in a storage unit (not shown), and executes a desired process based on the acquired data. The arithmetic unit 12 is, for example, an arithmetic processing unit (CPU) of a programmable logic controller (PLC).

The correction pattern analysis unit 16 operates in the correction amount data generation mode. The correction pattern analysis unit 16 calculates the correction time approximation formula and the correction amount approximation formula based on the data stored in the database in the manual data acquisition mode. As described above, the correction time approximation formula is an approximation formula that expresses the relationship between the correction time and the deviation of the quantified data with respect to the threshold value. The correction amount approximation formula is an approximation formula that expresses the relationship between the correction amount for the speed command value (control signal) and the deviation between the threshold value of the quantified data. The correction pattern analysis unit 16 extracts, for example, the corresponding data from the database for each product identification number, and calculates a correction time approximation formula and a correction amount approximation formula for each product identification number.

The correction pattern analysis unit 16 sets the calculated correction time approximation formula and correction amount approximation formula in the correction amount extraction unit 14. When the automatic slack correction system 110 is operated for a single product, for example, the correction pattern analysis unit 16 prepares a correction time approximation formula and a correction amount approximation formula in advance before entering the automatic operation mode. Set to 14. When the automatic slack correction system 110 is operated for a plurality of products, the correction time approximation formula and the correction amount approximation formula are set in the correction amount extraction unit 14 for each product identification number in the automatic operation mode.

The correction amount extraction unit 14 sets the correction time approximation formula and the correction amount approximation formula calculated by the correction pattern analysis unit 16. The correction amount extraction unit 14 transmits the calculated correction amount to the calculation unit 12, and the calculated correction amount is set by calculating a new speed command value by the calculation unit 12.

The operation of the automatic slack correction system 110 of the embodiment will be described in detail.
The operation in the manual data acquisition mode will be described.
In the manual data collection mode, the data collection unit 21 collects operation signals, control signals, and image data during the manual data collection period via the control controller 10.

The collected data is stored in the database as time-synchronized data by the data collection unit 21, and is stored in the storage unit 23. When the data of a plurality of products is used as a database, the time-series data synchronized with each product identification number is stored in the database.

This section describes how to set the manual data collection period and the data to be collected.
FIG. 3 is an example of a schematic operation waveform for explaining the operation of the automatic slack correction device of the paper machine of the embodiment.
FIG. 3 shows an example of the operating waveforms of the main signals and data in the manual data acquisition mode.

The uppermost figure of FIG. 3 shows a recording range setting signal (denoted as a recording range in the figure) generated for automatically setting the manual data acquisition period. When the recording range setting signal becomes high level (ON in the figure), data recording is started, and when the recording range setting signal becomes low level (OFF in the figure), data recording ends.

The second figure of FIG. 3 is the time change data of the operation signal (denoted as the operation equipment output signal in the figure). When the operator operates the operation tool 31, the operation signal becomes active, and in the figure, when the operation signal is active, it is described as ON, and when the operation signal is inactive, it is described as OFF.

The third stage figure of FIG. 3 is the time change data of the magnitude of the correction amount (denoted as the control correction value in the figure) for the speed command value.

The fourth row of FIG. 3 schematically shows a state in which the image data of the paper 6 viewed from above are arranged in chronological order.
The lowermost figure of FIG. 3 schematically shows a state in which the image data of the paper 6 viewed from the side are arranged in chronological order.
The image data diagram of FIG. 3 is actually digitized by the image processing unit 22, and the digitized data is time-synchronized and stored in the database.

As shown in FIG. 3, the data collection unit 21 constantly acquires data from the control controller 10. The data collection unit 21 has a buffer for temporarily accommodating the acquired data. When the data collection unit 21 detects that the operation signal has become active, it stores the time-series data of each signal from the time traced back by the period T0 in the database. The period T0 is set to, for example, one to several cycles of the processing cycle of the communication network 120 in consideration of the cycle for data transmission / reception by the communication network 120.

The manual intervention by the operator starts at time t1, and the manual intervention ends once at time t2. Due to the manual intervention of the operator from time t1 to time t2, the speed command value is increased by C1. Therefore, in the correction time (t2-t1), the correction amount is C1.

The operator is observing the timing of the next manual intervention while visually observing to what extent the slack state of the paper 6 has been resolved, and the manual intervention is performed again at time t3. The manual intervention at this time ends at time t4, and the correction amount in the correction time (t4-t3) from time t3 to time t4 is C2. Similarly, in the correction time (t6-t5), the correction amount is C3.

The data collection unit 21 ends the recording of the period data when the preset period T1 has elapsed from the end of the last manual intervention. The period T1 may be set to a sufficiently long period in advance and may be adjusted according to the actual operating condition of the paper machine 100.

The image processing unit 22 performs image processing on each image data of the photographing areas SVa and SVb to generate digitized data, and stores the data in the database of the storage unit 23. The quantified data is time synchronized and associated with the product identification number.

A method of generating digitized data will be described.
FIG. 4A is an example of image data in a shooting region from the side and above. FIG. 4B is a schematic enlarged view of part A of FIG. 4A. FIG. 4C is an example of a state in which slack is generated in the image data in the photographing region from the side and the upper side.
FIG. 4A shows the image data of the shooting area SVb from the side (left figure) and the image data of the shooting area SVa from above (right figure).

As shown in FIGS. 4 (a) and 4 (b), the image data of the photographing region SVa from above is divided into two-dimensional mesh regions, and the data has the magnitude of brightness for each region. The brightness data for each region of the two-dimensional mesh is converted into numerical data by, for example, taking a moving average of the magnitude of the brightness of each region. The moving average of each region is calculated by, for example, taking a sequential moving average in a direction along the transport direction and then taking a moving average in a direction orthogonal to the transport direction.

The image data of the shooting area SVb from the side may be quantified based on the brightness data of the two-dimensional mesh in the same manner as the quantification of the image data of SVa, or more easily, the image data of the paper 6 from the reference position. The distance to the position lowered by the slack may be used as numerical data.

In the automatic slack correction system 110 of the embodiment, a threshold value for quantified data (hereinafter, simply a threshold value) is used before the operation in the manual data acquisition mode is started or after the operation in the manual data acquisition mode is completed. ) Is preset.

For example, the threshold is set based on the image data stored in the database. The threshold value shall be the average value of the digitized data obtained for each extracted image data by sequentially reading out the image data stored in the database and extracting multiple data in the normal state by visual inspection or the like. Can be done. The threshold value is not limited to the average value of the extracted data, and may be a median value or the like, or an upper limit value and a lower limit value may be set using the standard deviation.

For example, the threshold is set based on image data separately acquired for threshold setting. Even if the paper machine 100 is operated on a trial basis, the image data is sufficiently adjusted so that the image data in a normal state can be acquired, the image data is acquired, and the digitized data in that case is used as the threshold value. good.

The threshold value is calculated by the data acquisition device 2 and then transmitted to the control controller 10, and the correction pattern analysis unit 16 and the correction amount extraction unit 14 set the threshold value.

As shown in FIG. 4C, when the control state is deviated or the like, the paper 6 is slackened, and at least one of the image data of the photographing areas SVa and SVb is bent or shadowed according to the slack. In the manual data acquisition mode, the image data in such a state is image-processed and stored in the database as digitized data.

In this way, the operation signal, control signal, image data, and digitized data in the manual data acquisition period are time-synchronized and stored in the database.

The correction amount data generation mode will be described.
In the correction amount data generation mode, the correction pattern analysis unit 16 extracts necessary data from the database, calculates a correction time approximation formula and a correction amount approximation formula, and sets the calculated approximation formula in the correction amount extraction unit 14.

Since the database stores the digitized data a based on the image data of the shooting area SVa from above and the digitized data b based on the image data of the shooting area SVb from the side, for example, these are appropriately weighted. By adding an additional count, it becomes a single quantified data. The unification of the digitized data may be performed by the correction pattern analysis unit 16 in the correction amount data generation mode, or when the digitized data a and b are calculated in the manual data acquisition mode, and the data is stored in the database. It may be stored.

5 (a) and 5 (b) are examples of quality comparison of paper image data. FIG. 5C is an example of a correction time approximation formula and a correction amount approximation formula generated by the automatic slack correction device of the paper machine.
The figure on the right of FIG. 5A shows the magnitude of the brightness of each region of the two-dimensional mesh of the image data in shades of light. The upper figure is the image data that provides the threshold value, and the lower figure is the brightness data of the two-dimensional mesh based on the image data acquired during the manual data collection period. The correction pattern analysis unit 16 calculates these deviations and extracts the time-synchronized operation signal and control signal data. Here, the control signal to be extracted is the correction amount data generated by the operation signal. The figure on the left of FIG. 5A will be described in the automatic operation mode described later.

The correction pattern analysis unit 16 advances the time, sequentially calculates the deviation, and extracts the data of the operation signal and the control signal at that time. The correction pattern analysis unit 16 sets the correction time up to the time when the operation signal becomes inactive, and sets the correction time and the correction amount for the deviation. This is repeated to end the plot in one manual data acquisition period.

The correction pattern analysis unit 16 extracts the data of the manual data collection period at other times, and generates a plot of the correction time and the correction amount for the deviation in the same manner as described above.

The correction pattern analysis unit 16 applies the large number of plots generated in this way to an appropriate approximation formula, and calculates the correction time approximation formula and the correction amount approximation formula.

The operation of the automatic operation mode will be described.
In the automatic operation mode, the data acquisition device 2 constantly collects image data. The image processing unit 22 performs image processing on the image data to generate digitized data. The image processing unit 22 transmits the generated digitized data to the correction amount extraction unit 14.

The correction amount extraction unit 14 calculates the deviation between the received digitized data and the threshold value. The correction amount extraction unit 14 inputs the calculated deviation into the correction time approximation formula and the correction amount approximation formula, respectively, and transmits the correction time and the correction amount calculated by the approximation formula to the calculation unit 12.

The calculation unit 12 adds the correction amount calculated by the correction amount extraction unit 14 to the speed command value, and supplies the correction amount to the drive device 40 over the calculated correction time.

In this way, the automatic slack correction system 110 of the paper machine can automatically correct the slack of the paper 6 without manual intervention by the operator.

In the automatic operation mode, image processing and digitization processing (moving average calculation) of image data are constantly performed, so that the burden on the arithmetic circuit becomes heavy. Therefore, we introduced image recognition technology to detect the feature amount of image data, and when it detects that an abnormality has occurred in the feature amount, we start the digitization process and generate the correction amount etc. by the approximate expression. You may do it.

The figure on the right of FIG. 5A shows an example in the case of performing image recognition of image data. The image processing unit 22 has an image recognition function. The image processing unit 22 compares the image data that is constantly acquired with the preset normal image data, and determines whether or not there is a difference of more than the preset threshold value between the respective feature amounts. When the feature amounts have a difference of more than a threshold value, the image processing unit 22 performs image processing on the acquired image data and generates digitized data. After that, the operation is the same as described above. As a result, the automatic slack correction system 110 can continue the normal operation when no abnormal slack occurs in the paper 6, and perform the correction operation when the slack to be corrected is detected. Therefore, the calculation processing load of the image processing unit 22 and the like is reduced, and the feedback control can be performed with a sufficient margin.

The effect of the automatic slack correction system 110 of the paper machine of the embodiment will be described.
The automatic slack correction system 110 of the paper machine of the embodiment collects data by the data collection device 2, and the control controller 10 calculates an approximate expression for automation corresponding to the manual intervention calculated based on the collected data. can do. Therefore, the paper machine 100 can automatically correct the slack of the conveyed paper 6 without manual intervention. By eliminating manual intervention, it is possible to reduce the burden on the operator without requiring the proficiency level of the operator.

By including the data collecting device 2, the automatic slack correction system 110 can store the operation signal of the paper machine 100, the control signal, and the image data representing the state of the conveyed paper 6 in the database in time synchronization. When storing in the database, the storage capacity of the storage unit 23 is appropriate by collecting the data of the manual data collection period set based on the operation signal instead of storing all the time series data, image data, etc. Can be set to.

The automatic slack correction system 110 operates by sequentially switching between a manual data acquisition mode, a correction data generation mode, and an automatic operation mode. In the manual data collection mode, data collection for generating an approximate expression can be reliably performed. Further, since the product identification number set for each product can be associated with each data, it is possible to construct a database for generating an approximate expression corresponding to a plurality of types of products.

The control controller 10 may have, for example, a plurality of CPU (Central Processing Unit) cores for arithmetic processing. One of the plurality of CPU cores is a PLC core that executes process control processing according to a control program. Of the plurality of CPU cores, the other one is a high-speed CPU core that performs high-speed arithmetic processing. The PLC core includes, for example, a calculation unit 12, and the high-speed CPU core includes a correction amount extraction unit 14 and a correction pattern analysis unit 16. By configuring the control controller 10 so as to have a plurality of CPU cores in this way, it is possible to realize a compact and low-cost automatic slack correction system 110.

According to the embodiment described above, it is possible to realize an automatic slack correction system for a paper machine that automatically corrects slack in paper without the need for manual operation by an operator.

Although some embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention and its equivalents described in the claims. In addition, each of the above-described embodiments can be implemented in combination with each other.

1a, 1b camera, 2 data collection device, 3 operation panel, 5a, 5b roll, 6 paper, 10 control controller, 12 calculation unit, 14 correction amount extraction unit, 16 correction pattern analysis unit, 18 display, 21 data collection unit , 22 Image processing unit, 23 Storage unit, 31 Operation supplies, 40 Drive unit, 100 Paper machine, 110 Automatic slack correction system

Claims (5)

An automatic slack correction system for a paper machine that is operated by sequentially switching between a first operation mode, a second operation mode, and a third operation mode.
A control controller provided to control the drive device that drives the motor of the roll that conveys the paper, and
A data collection device connected to the control controller and collecting image data acquired by a camera that captures an image of paper conveyed by the roll.
Equipped with
In the first operation mode, the control controller is a new second generated by the calculation of the correction amount generated based on the operation signal generated by the operation of the operator and the first control signal for controlling the drive device. A control signal is supplied to the drive device to supply the control signal.
The data acquisition device collects the first time-series data of the operation signal and the second time-series data of the second control signal from the control controller.
Image data acquired by the camera is collected and time-synchronized with the first time-series data and the second time-series data to generate a third time-series data.
The fourth time-series data of the quantified data obtained by image processing each of the third time-series data is generated.
In the second operation mode following the first operation mode, the control controller is based on the first time series data, the second time series data, the third time series data, and the fourth time series data. An approximate expression expressing the relationship between the second time-series data and the fourth time-series data was calculated.
In the third operation mode following the second operation mode, the data acquisition device processes new image data of paper by the camera to generate new digitized data.
The control controller automatically corrects slack in the papermaking machine by inputting the new digitized data into the approximate expression and generating a third control signal based on the output of the new control signal data and supplying the drive device. system. In the first operation mode, the data acquisition device starts storing the first to fourth time series data in the database according to the timing when the operation signal becomes active, and the operation signal is inactive. The automatic slack correction system for a papermaking machine according to claim 1, wherein the storage of the first to fourth time series data in the database is completed according to the timing. In the second operation mode, the control controller calculates the deviation between each data of the fourth time series data and the preset first threshold value.
The data at the time corresponding to the deviation is extracted from the second time series data, and the data is extracted.
The automatic slack correction system for a paper machine according to claim 1 or 2, wherein the approximate expression is calculated based on the deviation and the plot of the data. In the third operation mode, the data acquisition device generates the new digitized data when the size of the feature amount of the new paper image data is equal to or larger than a preset second threshold value. The automatic slack correction system for a papermaking machine according to any one of claims 1 to 3, wherein when the magnitude of the feature amount is smaller than the second threshold value, the new quantified data is not generated. The control controller inputs the deviation as the approximation formula, and outputs a correction time which is the time from the active time to the inactive time of the first time series data. The automatic slack correction system for a papermaking machine according to claim 3, wherein an equation and a second approximation equation for inputting the deviation and outputting the magnitude of the third control signal during the correction time are set.

Images