Paper machine temperature and moisture integrated monitoring system and control method thereof

Abstract

The invention discloses a paper machine temperature and moisture integrated monitoring system and a control method thereof. The paper machine temperature and moisture integrated monitoring system comprises imaging equipment, a temperature conversion module, a moisture conversion module and a control module. The imaging equipment is used for monitoring an initial roll paper reel of the paper machine and comprises a data acquisition module for acquiring thermal image data of initial roll paper on the initial roll paper reel; the temperature conversion module is connected with the data acquisition module and is used for converting the thermal image data into a temperature value; the moisture conversion module is connected with the temperature conversion module, and the moisture conversion module is configured to be capable of receiving the temperature numerical value and converting the temperature numerical value into a corresponding moisture numerical value; the control module is connected with the temperature conversion module and the moisture conversion module and can start the self-checking module according to the temperature value and / or the moisture value. Compared with the prior art, paper quality monitoring and papermaking production process adjustment closed loop can be realized.

Description

Technical Field

[0001] The invention relates to a paper machine temperature and moisture integrated monitoring system and a control method thereof, belonging to the technical field of temperature measurement using infrared radiation. Background Art

[0002] A papermaking machine is a general term for a complete set of equipment that is interconnected and used to form pulp into a paper web, including the main machines such as the headbox, wire section, press section, drying section, calender, reel, and transmission section, as well as auxiliary systems such as steam, water, vacuum, lubrication, and heat recovery.

[0003] As paper machines operate under harsh environmental conditions for a long time, the coordinated operation of the entire paper machine will inevitably fail. If not maintained in time, the quality and efficiency of paper production will directly decrease.

[0004] The drying system is a key component of paper processing, utilizing heat recovery. Furthermore, the surface temperature of the dryer cylinder affects paper quality. The dryer's temperature transfer efficiency and temperature uniformity have the most direct impact on paper drying. Therefore, paper machine dryer cylinder temperature is a key indicator that the industry needs to monitor. However, due to the influence of equipment structures such as protective shields and the operational requirements of paper machines, it is currently impossible to install temperature monitoring equipment directly around the dryer cylinders, resulting in production personnel being unable to collect dryer cylinder temperature data. Therefore, collecting dryer cylinder temperature data and using this data to control the papermaking process is a key challenge that the industry needs to overcome.

[0005] In addition, the moisture content of paper after drying in the drying cylinder is also a very important indicator. At present, most paper mills have entered the era of industrialization, informatization, and intelligence. The control system of each paper machine has many nodes, which requires strict management and control by highly qualified managers and technical engineers to ensure the smooth operation of large paper machines. In the existing technology, quality control system (hereinafter referred to as QCS) scanners are widely used to monitor quality parameters (such as moisture and basis weight) in the production process of household paper, but they have the following defects:

[0006] 1. Complex structure: QCS scanners are usually composed of multiple complex optical, electronic, radiation and mechanical components, which not only increases the cost of the equipment, but also leads to higher maintenance difficulty and failure rate.

[0007] 2. There are interference factors in the measurement accuracy: In some cases, the measurement principle may be affected by factors such as the surface texture and color of the paper, which may cause certain interference to the measurement accuracy.

[0008] 3. Response speed issue: During rapid production processes, the QCS scanner may not be able to accurately and timely obtain real-time information on changes in paper quality, resulting in delays in production adjustments.

[0009] At the same time, traditional temperature monitoring relies on manual inspections or single-point sensors, which cannot fully cover the temperature distribution of the drying cylinder surface and the paper winder, resulting in the inability to provide timely warnings of potential faults. Summary of the Invention

[0010] To solve the above technical problems, the present invention provides a paper machine temperature and moisture integrated monitoring system, which can solve at least one of the problems of complex scanner structure, interference factors in measurement accuracy, response speed problems and inability to provide early warning.

[0011] The technical solution of the present invention is:

[0012] A paper machine temperature and moisture integrated monitoring system, comprising:

[0013] An imaging device for monitoring a primary paper reel of the paper machine, and comprising a data acquisition module for acquiring thermal image data of the primary paper on the primary paper reel;

[0014] A temperature conversion module, connected to the data acquisition module and used to convert the thermal image data into temperature values;

[0015] a moisture conversion module connected to the temperature conversion module, wherein the moisture conversion module is configured to receive the temperature value and convert the temperature value into a corresponding moisture value;

[0016] The control module is connected to the temperature conversion module and the moisture conversion module respectively, and can start the self-test module according to the size of the temperature value and / or the moisture value.

[0017] As a further improvement of the present invention, it is defined that the first monitoring point and the second monitoring point with the farthest vertical distance are on the initial paper roll, the angle between the first monitoring point, the second monitoring point and the imaging device is a first angle, the monitoring range of the imaging device is a second angle, the first angle is included in the second angle and the angle of the first angle is one third to four fifths of the angle of the second angle.

[0018] As a further improvement of the present invention, the vertical distance between the first monitoring point and the second monitoring point is defined as the first length, the straight-line distance between the imaging device and the center point of the initial paper roll is defined as the second length, and the first length is between 40% and 80% of the second length.

[0019] As a further improvement of the present invention, the integrated monitoring system also includes an analysis module connected to the temperature conversion module and a display device for receiving the output of the analysis module. The analysis module is configured to generate analysis results based on the received real-time temperature values and transmit the analysis results to the display device.

[0020] As a further improvement of the present invention, the integrated monitoring system further includes an alarm module, which is activatably connected to the temperature conversion module and is configured to issue an alarm when an abnormal temperature value is received.

[0021] The present invention also provides a control method for a paper machine temperature and moisture integrated monitoring system, which can solve at least one of the problems of complex scanner structure, interference factors in measurement accuracy, response speed problems, and inability to provide early warning.

[0022] The technical solution of the present invention is:

[0023] A control method for a paper machine temperature and moisture integrated monitoring system is provided, for monitoring the aforementioned paper machine temperature and moisture integrated monitoring system, the control method comprising:

[0024] Collecting thermal image data of the initial roll of paper on the initial roll of paper reel;

[0025] Obtaining a temperature value corresponding to the thermal image data based on a thermal image mapping algorithm;

[0026] Converting the temperature value into a corresponding moisture value based on a temperature-moisture conversion algorithm;

[0027] Based on the comparison result of the temperature value and the moisture value with the preset values, a self-check or alarm function is activated.

[0028] As a further improvement of the present invention, the step of obtaining the corresponding temperature value based on the thermal image mapping algorithm includes:

[0029] Construct a thermal image mapping model based on thermal image mapping algorithm;

[0030] Preprocessing the thermal image data;

[0031] extracting grayscale values from the thermal image data based on the thermal image mapping model, and inputting the grayscale values into the thermal image mapping model;

[0032] The grayscale value is mapped to a corresponding temperature value according to a mapping formula.

[0033] As a further improvement of the present invention, the temperature-moisture conversion algorithm is used to convert the temperature value into a corresponding moisture value, including:

[0034] Construct a temperature-moisture conversion model based on the temperature-moisture conversion algorithm;

[0035] Inputting the temperature value into the temperature-moisture conversion model;

[0036] A moisture value corresponding to the temperature value is output based on the temperature-moisture conversion model.

[0037] As a further improvement of the present invention, constructing a temperature-moisture conversion model based on the temperature-moisture conversion algorithm includes:

[0038] Collect temperature and its corresponding moisture values multiple times to form a data list;

[0039] The data in the data list are fitted into a line to obtain the calibration lines of temperature and moisture;

[0040] The temperature-moisture conversion model is constructed based on the calibration line.

[0041] As a further improvement of the present invention, there are multiple temperature-moisture conversion models corresponding to different paper types, and the multiple temperature-moisture conversion models are configured to be manually switched or automatically switched according to the paper type data monitored by the monitoring module for monitoring the paper type.

[0042] The beneficial technical effects of the present invention are as follows: the integrated temperature and moisture monitoring system for a paper machine monitors the paper machine's primary paper reel using an imaging device and collects thermal image data of the primary paper on the reel. A temperature conversion module converts the thermal image data into a temperature value, which is then converted into a corresponding moisture value using a moisture conversion module. This allows for precise simultaneous measurement of both temperature and paper moisture using non-contact imaging. Furthermore, a control module is connected to the temperature conversion module and the moisture conversion module, respectively, and can activate a self-test module based on the temperature and / or moisture values, thereby linking data collection with the production control system, achieving a closed-loop system for paper quality monitoring and papermaking process adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural block diagram of a paper machine temperature and moisture integrated monitoring system according to a preferred embodiment of the present invention.

[0044] Figure 2 yes Figure 1 Schematic diagram of the installation of imaging equipment and paper machine.

[0045] Figure 3 yes Figure 1 Another installation diagram of the imaging equipment and paper machine.

[0046] Figure 4 yes Figure 2 or Figure 3 Schematic diagram of real-time acquisition of thermal image data of a paper scroll banner by an imaging device.

[0047] Figure 5 yes Figure 1The display device after the analysis module displays the temperature fluctuation graph on the same horizontal line.

[0048] Figure 6 yes Figure 1 The display device after the analysis module displays a curve graph showing the difference distribution changing with time.

[0049] Figure 7 yes Figure 1 The display device after the analysis module displays the real-time temperature data table.

[0050] Figure 8 yes Figure 1 The following figure shows a set of thermal images obtained by the paper machine temperature and moisture integrated monitoring system during the test.

[0051] Figure 9 yes Figure 1 The figure shows a set of temperature curves obtained by the paper machine temperature and moisture integrated monitoring system during the test process.

[0052] Figure 10 It is a flow chart of a control method of a paper machine temperature and moisture integrated monitoring system according to a preferred embodiment of the present invention.

[0053] Figure 11 yes Figure 10 Flowchart for obtaining the corresponding temperature value based on the thermal image mapping algorithm.

[0054] Figure 12 yes Figure 10 A flow chart of converting the temperature value into the corresponding moisture value based on the temperature-moisture conversion algorithm.

[0055] Figure 13 yes Figure 12 Flowchart of constructing a temperature-moisture conversion model based on the temperature-moisture conversion algorithm.

[0056] Figure 14 yes Figure 12 A list of data collected multiple times.

[0057] Figure 15 is based on Figure 14 The fitted line is obtained from the data list. DETAILED DESCRIPTION

[0058] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0059] See also Figures 1 to 4As shown, the present invention discloses an integrated temperature and moisture monitoring system for a paper machine, comprising an imaging device 1, a temperature conversion module 2, a moisture conversion module 3, and a control module 4. The imaging device 1 is used to monitor the paper roll 200 of the paper machine 100 and includes a data acquisition module for collecting thermal image data of the paper roll on the paper roll 200. The temperature conversion module 2 is connected to the data acquisition module and is configured to convert the thermal image data into a temperature value. The moisture conversion module 3 is connected to the temperature conversion module 2 and is configured to receive the temperature value and convert it into a corresponding moisture value. The control module 4 is connected to the temperature conversion module 2 and the moisture conversion module 3, respectively, and is configured to activate a self-test module 5 based on the temperature value and / or the moisture value. This configuration allows for simultaneous and accurate measurement of temperature and paper moisture using a non-contact thermal imager, and is linked to the production control system to achieve a closed-loop system for paper quality monitoring and papermaking process adjustment. Alternatively, the control module 4 can be connected only to the moisture conversion module 3 to receive the temperature and moisture values within the moisture conversion module 3.

[0060] Specifically, the imaging device 1 is non-contact and independent of the paper machine 100. The imaging device 1 can be mounted on various locations, such as a wall or a bracket, to monitor the position of the primary paper reel 200 of the paper machine 100. Generally, the dryer cylinder of a paper machine is large and complex, with most areas obscured by protective covers and protected from view. Furthermore, devices such as scrapers are installed, making it impossible to directly locate a monitoring area on the dryer cylinder surface. After the paper web is peeled from the dryer cylinder, it passes through the paper guide rollers and is wound onto the primary reel. Between the dryer cylinder and the primary reel, the web vibrates significantly due to the high speed of the machine, resulting in significant interference if used as an infrared monitoring point. The primary paper reel 200, however, is closer to the dryer cylinder, has a higher paper roll density, and operates relatively stably. Therefore, the imaging device 1 is installed behind or above the reeling section of the paper machine.

[0061] In this embodiment, the imaging device 1 is a thermal imager O. The thermal imager O monitors infrared radiation from the surface of an object and converts it into temperature data. Infrared radiation may attenuate during propagation, especially in the air. If there is water vapor, dust or other particulate matter, it may absorb or scatter infrared rays, resulting in a reduction in the radiation received by the thermal imager O, thereby affecting the temperature reading. Preferably, Figure 2As shown, the thermal imager O is installed just above the primary paper reel 200. However, the primary paper reel 200 is frequently used for reel changing and crane operation, and the vibration is large, which is not conducive to the installation and fixing of the thermal imager O. After on-site inspection, it is preferred to install it on the wall of the control room next to the paper machine 100 without adding auxiliary devices. Figure 3 As shown, in other operating environments, the thermal imager O is preferably positioned near the center of the primary paper roll 200. This maximizes the monitoring and data acquisition capabilities of the thermal imager O. Of course, in actual use, the user can select an appropriate installation location based on site conditions and is not limited to the options in this embodiment.

[0062] During installation, the thermal imager O's measurement accuracy, resolution, thermal sensitivity, and field of view are key indicators to evaluate. A high-resolution thermal imager O may maintain good spatial resolution at longer distances, while a low-resolution device may not accurately capture temperature differences at long distances. Therefore, parameters need to be adjusted based on actual conditions.

[0063] In this embodiment, the installation position of the thermal imager O is set. Specifically, a first monitoring point C and a second monitoring point D are defined as having the greatest vertical distance on the primary paper roll 200. The angle between the first monitoring point C, the second monitoring point D, and the thermal imager O is defined as a first angle COD. The monitoring range of the thermal imager O is defined as a second angle AOB. The first angle COD is included in the second angle AOB and is between one-third and four-fifths of the second angle AOB. Preferably, the first angle COD can be 36°, 66°, 78°, etc., and the second angle AOB can be 90°, 92°, 94°, etc. It should be noted that the second angle AOB represents the actual detection range of the thermal imager O. When a specific specification of thermal imager O is specified, the second angle AOB remains unchanged. However, in actual use, the second angle AOB can be changed by selecting a thermal imager O of a different specification. Therefore, the angle of the second angle AOB is not unchangeable.

[0064] The vertical distance between the first monitoring point C and the second monitoring point D is defined as a first length, and the linear distance between the thermal imager O and the center point of the primary paper roll 200 is defined as a second length. The first length is between 40% and 80% of the second length. This configuration ensures that the thermal imager O can accurately capture temperature differences.

[0065] The integrated monitoring system further includes an analysis module 21 connected to the temperature conversion module 2 and a display device 6 for receiving the output of the analysis module 21. The analysis module 21 is configured to generate analysis results based on the received real-time temperature values and transmit the analysis results to the display device 6. Preferably, the analysis module 21 can further analyze the temperature values obtained within a time period, such as calculating statistical information such as the average temperature, maximum temperature, and minimum temperature, or drawing a visual chart such as a histogram or pie chart of the temperature distribution, and output it through the display device 6 to provide the operator with a clear understanding of the current situation.

[0066] See also Figures 5 to 7 As shown, the display device 6 can display the temperature fluctuation of the same horizontal line, the curve of the difference distribution changing with time, and the temperature list of each stage after the analysis module 21. Figure 8 and Figure 9 The following are images obtained from a set of experimental data.

[0067] The integrated monitoring system further comprises an alarm module 7 , which is activatably connected to the temperature conversion module 2 and configured to issue an alarm when an abnormal temperature value is received.

[0068] In this embodiment, the alarm module 7 has four different alarm thresholds and levels, and supports I / O output for linkage with fire protection and other systems. Four different alarm modes are set to remind staff to make accurate assessments of the urgency, development trend and possible harm of hidden dangers, thereby improving the effectiveness of treatment.

[0069] Specifically include:

[0070] (1) Average temperature control of the banner (i.e., the first roll of paper on the first roll of paper reel 200): When the average temperature of the banner is 5°C higher than normal, a reminder is issued on the display device 6, suggesting that the staff continue to observe whether the temperature will continue to rise. That is, at this time, the alarm module 7 transmits the alarm information to the display device 6 and displays it. Therefore, the alarm module 7 is connected to the display device 6; when it is 10°C higher than normal, the sound and light alarm 71 in the control room issues an alarm, reminding the staff that they must go to the site for inspection. At this time, the sound and light alarm 71 in the control room connected to the alarm module 7 is activated to issue an alarm; when it is 20°C higher than normal, the SMS alarm system 72 connected to the alarm module 7 will send the alarm information to the mobile phone of the manager to notify the fault, which will help to arrange and issue maintenance orders in time to avoid the expansion of the fault.

[0071] (2) Banner temperature difference control: When the banner temperature difference is greater than 10°C, the monitoring screen will issue a reminder; when it is greater than 15°C, the sound and light alarm 71 in the central control room will sound an alarm, reminding the staff to go to the site for inspection; when it is greater than 20°C, the SMS alarm system 72 will send an alarm message to the manager's mobile phone to notify the fault, which will help to arrange and issue maintenance orders in time to avoid the expansion of the fault.

[0072] (3) Alarm record: When the temperature of the monitored target is abnormal, the monitoring background will promptly detect the abnormal temperature area and trigger the alarm. The sound and light alarm 71 in the control room will sound an alarm and the software background will record the alarm location and area, and save the abnormal image in a designated folder for easy later search and retrieval.

[0073] (4) Alarm query: The system automatically stores alarm events of different levels and captures the full radiation thermal image video at the time for subsequent analysis.

[0074] Correspondingly, the control module 4 further includes a DCS control system, which includes a temperature-DCS linkage control system 41 and a moisture-DCS linkage control system 42 to link the production system.

[0075] Specifically, the temperature-DCS linkage control system 41 is configured as follows: when it is detected that the average horizontal temperature is 5°C lower than normal, the steam supply system (i.e., the self-test module 5) is automatically triggered to self-test, such as steam temperature, drying cylinder pressure, condensate discharge volume, etc. If the parameter settings are abnormal, they are automatically adjusted to normal settings; if the data settings are normal, the parameters need to be manually adjusted, and the temperature is continuously observed to see if it recovers; if the temperature still cannot return to the normal range, it is necessary to expand the scope of troubleshooting, or shut down for maintenance.

[0076] When it is detected that the average banner temperature is 5°C higher than normal, the steam supply system self-check is automatically triggered, such as steam temperature, drying cylinder pressure, condensate discharge, etc. If the parameter settings are abnormal, they will be automatically adjusted to normal settings; if the data settings are normal, the parameters need to be adjusted manually and the temperature needs to be continuously observed to see if it drops. If the temperature still cannot be lowered to the normal range, the scope of troubleshooting needs to be expanded, or the machine needs to be shut down for maintenance.

[0077] When a horizontal temperature difference of >10°C is detected, the relevant process parameter checks are automatically triggered, such as condensate circulation, drying cylinder coating, scraper, vacuum suction box, mesh cleanliness, head box lip opening and closing, etc. If there are abnormalities in the parameter settings of each link, they will be automatically adjusted to the normal settings; if the parameter settings are normal, manual intervention is required to check the causes of the fault one by one and make timely adjustments.

[0078] The moisture-DCS linkage control system 42 is configured as follows: based on the control range of 7%±1.5% for the moisture content of the initial roll of paper, when the average moisture content of the banner is detected to be higher than the set value, the corresponding average temperature of the banner is lower than the normal value; when the average moisture content of the banner is detected to be lower than the set value, the corresponding average temperature of the banner is higher than the normal value; the control method refers to the temperature-DCS linkage control system 41.

[0079] See also Figure 10 As shown, the present invention also discloses a control method for a paper machine temperature and moisture integrated monitoring system, the control method comprising:

[0080] Collecting thermal image data of the initial roll of paper on the initial roll of paper reel 200;

[0081] Obtaining a temperature value corresponding to the thermal image data based on a thermal image mapping algorithm;

[0082] Converting the temperature value into a corresponding moisture value based on a temperature-moisture conversion algorithm;

[0083] Based on the comparison result of the temperature value and the moisture value with the preset values, a self-check or alarm function is activated.

[0084] That is to say, thermal image data is collected by the thermal imager O, and the corresponding temperature value is extracted from the thermal image data, and then the corresponding moisture value is extracted from the temperature value, so as to monitor the temperature value and the moisture value in real time, and perform self-inspection or alarm when necessary.

[0085] For details, please refer to Figure 11 As shown, the corresponding temperature value obtained based on the thermal image mapping algorithm includes:

[0086] Construct a thermal image mapping model based on thermal image mapping algorithm;

[0087] Preprocessing the thermal image data;

[0088] extracting grayscale values from the thermal image data based on the thermal image mapping model, and inputting the grayscale values into the thermal image mapping model;

[0089] The grayscale value is mapped to a corresponding temperature value according to a mapping formula.

[0090] Generally speaking, a pre-prepared grayscale value-to-temperature correspondence table can be imported into the thermal image mapping model so that, after inputting the grayscale value into the thermal image mapping model, the corresponding temperature value is obtained. Alternatively, a conversion formula between grayscale values and temperature values can be set within the thermal image mapping model to obtain the corresponding temperature value.

[0091] See also Figure 12 As shown, the temperature-moisture conversion algorithm based on the temperature-moisture conversion method converts the temperature value into the corresponding moisture value, including:

[0092] Construct a temperature-moisture conversion model based on the temperature-moisture conversion algorithm;

[0093] Inputting the temperature value into the temperature-moisture conversion model;

[0094] A moisture value corresponding to the temperature value is output based on the temperature-moisture conversion model.

[0095] Preferably, see Figure 13 As shown in FIG, the temperature-moisture conversion model based on the temperature-moisture conversion algorithm includes:

[0096] Collect temperature and its corresponding moisture values multiple times to form a data list;

[0097] The data in the data list are fitted into a line to obtain the calibration lines of temperature and moisture;

[0098] The temperature-moisture conversion model is constructed based on the calibration line.

[0099] For details, please combine Figure 14 and Figure 15 As shown, after multiple acquisitions, we obtained Figure 14 The data list shown, then according to Figure 15 The temperature-moisture axis is constructed as shown in , and then the calibration line is obtained by fitting the line.

[0100] Thus, after the temperature value is input into the temperature-moisture conversion model, the corresponding moisture value can be obtained. In this embodiment, the process of collecting temperature and its corresponding moisture value multiple times to form a data list is the testing phase. Generally speaking, at least three collections are required, namely collecting the moisture values corresponding to the lowest temperature value, the highest temperature value, and the intermediate temperature values to obtain these six values. Then, a calibration line is obtained through curve fitting or linear fitting. Of course, to ensure the accuracy of the calibration line, the more collections the better, preferably at least five times, so that the accuracy of the calibration line can be guaranteed to a certain extent.

[0101] In this embodiment, the calculation formula of the fitting line is y=-0.0476x+8.9015, where y represents the moisture content and x represents the temperature. After that, only the temperature needs to be collected to automatically calculate the corresponding moisture content. Experiments have shown that the fitting degree of this calculation formula is R 2 =0.9058, when R 2The closer it is to 1, the more accurate the fitting degree is. Of course, in other embodiments, other fitting formulas can also be set, as long as the moisture content is within a certain error range.

[0102] Preferably, multiple temperature-moisture conversion models are provided to correspond to different paper grades, and the multiple temperature-moisture conversion models are configured to be manually switched or automatically switched based on paper grade data monitored by a monitoring module for monitoring paper grades. In this case, the calculation formula of the fitting line will naturally be different for different paper grades.

[0103] When manual switching is used, the corresponding temperature-moisture conversion model can be selected based on the different paper grades in the batch. Of course, a monitoring module for monitoring the paper grades can also be provided. This monitoring module is configured to transmit the detected paper grade data to a central processor, which controls the moisture conversion module 3 to switch to the corresponding temperature-moisture conversion model 42. The monitoring module can also be integrated with the imaging device 1 or can be an independent device independent of the imaging device 1, without limitation.

[0104] In summary, the integrated temperature and moisture monitoring system for a paper machine according to the present invention monitors the paper machine's primary paper reel 200 via an imaging device 1 and collects thermal image data of the primary paper on the primary paper reel 200. The temperature conversion module 2 converts the thermal image data into a temperature value, which is then converted into a corresponding moisture value via the moisture conversion module 3. This allows for precise measurement of both temperature and paper moisture simultaneously using the non-contact imaging device 1. Furthermore, a control module 4 is connected to the temperature conversion module 2 and the moisture conversion module 3, respectively, and is capable of activating a self-test module based on the temperature and / or moisture values, thereby linking data acquisition with the production control system, achieving a closed-loop system for paper quality monitoring and papermaking process adjustment.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A paper machine temperature and moisture integrated monitoring system, characterized in that: include: An imaging device for monitoring a primary paper reel of the paper machine, and comprising a data acquisition module for acquiring thermal image data of the primary paper on the primary paper reel; A temperature conversion module, connected to the data acquisition module and used to convert the thermal image data into temperature values; a moisture conversion module connected to the temperature conversion module, wherein the moisture conversion module is configured to receive the temperature value and convert the temperature value into a corresponding moisture value; The control module is connected to the temperature conversion module and the moisture conversion module respectively, and can start the self-test module according to the size of the temperature value and / or the moisture value.

2. The paper machine temperature and moisture integrated monitoring system according to claim 1, characterized in that: Define that the first monitoring point and the second monitoring point with the farthest vertical distance on the initial paper roll are defined, the angle between the first monitoring point, the second monitoring point and the imaging device is the first angle, the monitoring range of the imaging device is the second angle, the first angle is included in the second angle and the angle of the first angle is one third to four fifths of the angle of the second angle.

3. The paper machine temperature and moisture integrated monitoring system according to claim 2, characterized in that: The vertical distance between the first monitoring point and the second monitoring point is defined as a first length, the straight-line distance between the imaging device and the center point of the primary paper roll is defined as a second length, and the first length is between 40% and 80% of the second length.

4. The paper machine temperature and moisture integrated monitoring system according to claim 1, characterized in that: The integrated monitoring system also includes an analysis module connected to the temperature conversion module and a display device for receiving the output of the analysis module. The analysis module is configured to generate analysis results based on the received real-time temperature values and transmit the analysis results to the display device.

5. The paper machine temperature and moisture integrated monitoring system according to claim 1, characterized in that: The integrated monitoring system further includes an alarm module, which is activatably connected to the temperature conversion module and is configured to issue an alarm when an abnormal temperature value is received.

6. A control method for a paper machine temperature and moisture integrated monitoring system, characterized in that: For monitoring the paper machine temperature and moisture integrated monitoring system according to any one of claims 1 to 5, the control method comprises: Collecting thermal image data of the initial roll of paper on the initial roll of paper reel; Obtaining a temperature value corresponding to the thermal image data based on a thermal image mapping algorithm; Converting the temperature value into a corresponding moisture value based on a temperature-moisture conversion algorithm; Based on the comparison result of the temperature value and the moisture value with the preset values, a self-check or alarm function is activated.

7. The control method according to claim 6, characterized in that: The method of obtaining the corresponding temperature value based on the thermal image mapping algorithm includes: Construct a thermal image mapping model based on thermal image mapping algorithm; Preprocessing the thermal image data; extracting grayscale values from the thermal image data based on the thermal image mapping model, and inputting the grayscale values into the thermal image mapping model; The grayscale value is mapped to a corresponding temperature value according to a mapping formula.

8. The control method according to claim 6, characterized in that: The converting of the temperature value into the corresponding moisture value based on the temperature-moisture conversion algorithm includes: Construct a temperature-moisture conversion model based on the temperature-moisture conversion algorithm; Inputting the temperature value into the temperature-moisture conversion model; A moisture value corresponding to the temperature value is output based on the temperature-moisture conversion model.

9. The control method according to claim 8, characterized in that: The construction of a temperature-moisture conversion model based on the temperature-moisture conversion algorithm includes: Collect temperature and its corresponding moisture values multiple times to form a data list; The data in the data list are fitted into a line to obtain a calibration line of temperature and moisture; The temperature-moisture conversion model is constructed based on the calibration line.

10. The control method according to claim 8, characterized in that: There are multiple temperature-moisture conversion models corresponding to different paper grades. The multiple temperature-moisture conversion models are configured to be manually switched or automatically switched according to paper grade data monitored by a monitoring module for monitoring paper grades.

Images