CN115371819A - Paper surface temperature online monitoring method and monitoring system of household paper - Google Patents

Abstract

The invention discloses a paper surface temperature on-line monitoring method and a paper surface temperature on-line monitoring system for household paper, wherein the paper surface temperature on-line monitoring method comprises the following steps: acquiring a visible light image and an infrared thermal imaging image of the paper surface of the roll paper; drawing a horizontal reference line on the infrared thermal imaging image as a temperature measuring line, selecting a plurality of points at equal distances on the temperature measuring line as a plurality of temperature measuring points, and acquiring the temperatures of all the temperature measuring points in real time; setting an upper threshold and a lower threshold of the temperature of each temperature measuring point, and if the temperature of a certain temperature measuring point is greater than the upper threshold, performing overtemperature alarm; if the temperature of a certain temperature measuring point is less than the lower limit threshold value, low-temperature alarm is carried out; and calculating the movement range of the temperature between all adjacent temperature measuring points, respectively setting an upper limit movement range threshold and a lower limit movement range threshold of the adjacent temperature measuring points, and performing maintenance alarm when a certain movement range is greater than the upper limit movement range threshold or less than the lower limit movement range threshold. The method is suitable for monitoring the temperature in the drying process of the household paper.

Description

Paper surface temperature online monitoring method and monitoring system of household paper

technical field

The invention relates to the field of paper surface temperature monitoring on a production line, in particular to an online paper surface temperature monitoring method and monitoring system for household paper.

Background technique

In the manufacturing process of household paper such as roll paper and pumping paper, when the roll paper is dried, it needs to go through dehydration and drying processes. The pulp with a concentration of 75% is squeezed out of 80% of the water by rollers, and then Use the high-temperature steam of the drying cylinder to dry and leave 5% to 6% of the moisture. During the dehydration process, too much or too little moisture on the paper surface will affect the quality of the paper product. If the moisture on the paper surface is large, the dryer needs to provide more heat to dehydrate the paper product, which requires more fuel for the dryer. Cylinders will cause waste of fuel, and the production cost of paper products will increase; the moisture on the paper surface is small, and fires are prone to occur during drying. At the same time, the moisture content of paper products also has a great influence on the quality of paper products.

In order to make the moisture content of the dried paper meet the requirements, according to the corresponding relationship between different moisture content and temperature on the surface of the roll paper, during the drying operation, the temperature of the roll paper surface is detected and monitored in real time to prevent the The temperature of the roll paper surface is too high or too low due to the failure of the cylinder and other factors, which will affect the quality of the paper product. When the moisture on the paper surface is too high (the temperature of the paper surface is low), it is easy to cause waste of fuel energy; when the pressure of the press roller is not enough (the temperature of the paper surface is low), the paper surface is thick and the amount of paper fiber is large, resulting in the loss of paper fiber consumables. waste.

At present, the detection and early warning of the temperature of the roll paper surface mainly rely on the inspection of the on-site staff, and the early warning is not timely and accurate; the reliability is poor, subject to the personal experience of the operation and maintenance personnel, and it is easy to cause large erroneous inspections; the timeliness is poor and the degree of automation is low , Inefficiency, it is difficult to realize all-weather inspections, and there are hidden dangers of accidents; the traceability is poor, the temperature measurement is not continuous, and it is difficult to trace after an accident. It is impossible to monitor the temperature of the target part of the paper surface in real time during the entire production process, which will easily lead to a decline in the quality of the paper product and an increase in the production cost.

Contents of the invention

Aiming at the problems existing in the prior art, the purpose of the present invention is to provide an online monitoring method for paper surface temperature of household paper, which can monitor the paper surface temperature of roll paper driven by a rotating shaft in real time, and can perform temperature alarm, so as to The relevant equipment for drying paper products should be adjusted in time to ensure the safety of the paper drying process and avoid waste of resources.

To achieve the above object, the technical scheme of the present invention is as follows:

A paper surface temperature online monitoring method of household paper, comprising:

Obtain visible light images and infrared thermal imaging images of the roll paper surface;

Draw a horizontal reference line on the infrared thermal imaging image as a temperature measurement line, select multiple points equidistantly on the temperature measurement line as a plurality of temperature measurement points, and obtain the temperatures of all the temperature measurement points in real time;

Set the upper limit threshold and the lower limit threshold of each temperature measurement point temperature, if the temperature of a certain temperature measurement point is greater than its upper limit threshold, an over-temperature alarm will be given; if the temperature of a certain temperature measurement point is less than its lower limit threshold , low temperature alarm;

Calculate the moving range of temperature between all adjacent temperature measuring points, set the upper limit moving range threshold and the lower limit moving range threshold of adjacent temperature measuring points respectively, when a certain moving range is greater than its upper limit moving range When the difference threshold is lower than its lower limit moving range threshold, a maintenance alarm will be issued.

Further, calculate the temperature mean value of all the temperature measuring points, set the upper limit mean value threshold and the lower limit mean value threshold value, if the temperature mean value is greater than the upper limit mean value threshold value, lower the drying cylinder power and fan power for drying; if the If the average temperature is less than the lower average threshold, the power of the drying cylinder and the power of the fan for drying are increased.

Further, when four or more consecutive moving ranges are all positive or negative, the pressure imbalance alarm at both ends of the press roller is issued, and the pressure at both ends of the press roller is automatically adjusted.

Further, all the temperature measurement points are divided into three or more adjacent groups on average, each group includes calculating the moving range of each group separately, and setting the upper limit moving range threshold and the lower moving range threshold of each group respectively , if the temperature range of a certain group is greater than the upper limit moving range threshold of the corresponding group or less than the lower limit moving range threshold of the corresponding group, a maintenance alarm is performed.

Further, all the temperature measurement points are divided into two adjacent groups on average, and the moving ranges of each group are calculated respectively. The two groups set the same upper limit moving range threshold and lower limit moving range threshold. If one group When the temperature extreme difference is greater than the upper limit movement extreme difference threshold or less than the lower limit movement extreme difference threshold, the pressure at both ends of the press roller is automatically adjusted.

The paper surface temperature online monitoring method of household paper of the present invention aims at the disadvantages of poor reliability, poor timeliness, and low traceability of manual inspection of the roll paper surface temperature during the paper product drying process. Real-time and accurate monitoring of the point temperature, and timely temperature alarm, so that the staff can adjust the paper drying equipment in time to ensure the safety of the paper drying process and avoid waste of resources. The paper surface temperature online monitoring method is very suitable for monitoring the roll paper surface temperature in the high-speed dehydration and drying process, which not only saves labor costs, fuel energy and raw paper fibers, but also improves the quality of household paper. quality.

The present invention also provides an online paper surface temperature monitoring system for household paper, including: a high-definition thermal imaging dual-light camera, a network switching device, a monitoring terminal, and an image storage device;

The high-definition thermal imaging dual-light camera is used to acquire the visible light image and the infrared thermal imaging image of the roll paper surface, and send the visible light image and the infrared thermal imaging image to the monitoring terminal and the monitoring terminal through the network switching device said image storage device;

The monitoring terminal is used to draw a horizontal reference line on the infrared thermal imaging image as a temperature measurement line, and select multiple points equidistantly on the temperature measurement line as multiple temperature measurement points;

The monitoring terminal controls the temperature of the plurality of temperature measurement points obtained by the high-definition thermal imaging dual-light camera in real time through the network switching device, and passes the temperature data of the plurality of temperature measurement points through the network The switching device sends to the image storage device;

The monitoring terminal is also used to display the visible light image, the infrared thermal imaging image and the temperature data of multiple temperature measurement points in real time; the monitoring terminal is also used to set the upper limit of the temperature of each temperature measurement point Threshold and lower threshold, if the temperature of a certain temperature measurement point is greater than its upper threshold, an over-temperature alarm will be given; if the temperature of a certain temperature measurement point is less than its lower limit threshold, a low temperature alarm will be performed;

The monitoring terminal is also used to calculate the moving range of temperature between all adjacent temperature measuring points, respectively set the upper limit moving range threshold and the lower limit moving range threshold of adjacent temperature measuring points, when one of the moving When the range is greater than its upper limit movement range threshold or less than its limit movement range threshold, a maintenance alarm will be issued.

The image storage device is used for storing the visible light image, the infrared thermal imaging image and temperature data of a plurality of temperature measurement points.

Further, the paper surface temperature online monitoring system also includes: a fan and drying cylinder for drying, and a PLC controller; the monitoring terminal is used to calculate the temperature average value of all the temperature measurement points, and set the upper limit average threshold and the lower limit average value Threshold, if the average temperature is greater than the upper average threshold, the monitoring terminal controls the PLC controller to lower the dryer power and the fan power; if the average temperature is less than the lower average threshold, the monitoring The terminal controls the PLC controller to increase the power of the drying cylinder and the power of the fan.

Further, the paper surface temperature online monitoring system also includes: a press roller for pressing paper products, when more than four consecutive moving ranges are all positive or negative, the monitoring terminal is used to The pressure imbalance alarm at both ends of the pressing roller, and the PLC controller is controlled to adjust the pressure at both ends of the pressing roller.

Further, the monitoring terminal is also used to divide all the temperature measurement points into three or more adjacent groups on average, calculate the moving ranges of each group, and set the upper limit moving range threshold and the lower limit moving range of each group respectively. Range threshold, if the temperature range of a certain group is greater than the upper limit moving range threshold of the corresponding group or less than the lower limit moving range threshold of the corresponding group, a maintenance alarm will be issued.

Further, the monitoring terminal is also used to divide all the temperature measurement points into two adjacent groups on average, calculate the moving range of each group respectively, and set the same upper limit moving range threshold and lower limit moving limit for the two groups. difference threshold, if the temperature extreme difference of one group is greater than the upper limit mobile extreme difference threshold or less than the lower limit mobile extreme difference threshold, the monitoring terminal is used to control the PLC controller to adjust the pressure at both ends of the press roller.

The paper surface temperature online monitoring system for household paper of the present invention aims at the disadvantages of poor reliability, poor timeliness, and low traceability of manual inspection of the roll paper surface temperature during the drying process of paper products, and adopts a high-definition thermal imaging dual-light camera to obtain temperature measurement points Real-time and accurate monitoring of the temperature at multiple points on the roll paper surface, judge whether the temperature of the temperature measurement point meets the requirements through the monitoring terminal, and timely perform temperature and maintenance alarms, so that the staff can timely monitor the drying equipment for paper products Adjustment to ensure the safety of the paper drying process and avoid waste of resources. This paper surface temperature online monitoring system is very suitable for monitoring the paper surface temperature of roll paper in the dehydration and drying process running at high speed. It not only saves labor costs, fuel energy and virgin paper fibers, but also improves the quality of household paper. quality.

Description of drawings

Fig. 1 is the flow chart of the paper surface temperature online monitoring method of household paper provided in Example 1 of the present invention;

Fig. 2 is a schematic composition diagram of an on-line monitoring system for paper surface temperature of tissue paper provided in Example 2 of the present invention;

3 is a schematic diagram of the relative position relationship between the high-definition thermal imaging dual-light camera and the roll paper surface in the paper surface temperature online monitoring system of embodiment 2;

Fig. 4 is the schematic diagram of the main interface of the client in the paper surface temperature online monitoring system of embodiment 2;

Fig. 5 is the schematic diagram of the main interface of the web end in the paper surface temperature online monitoring system of embodiment 2;

In the picture:

1—high-definition thermal imaging dual-light camera; 2—network switching equipment; 3—monitoring terminal; 4—image storage device; 5—fan; 6—drying cylinder; 7—infrared thermal imaging image of roll paper; 7-1—test warmer.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings in the examples of the present invention. Obviously, the described examples are only part of the examples of the present invention , not all examples. Based on the examples in the present invention, all other implementations obtained by those skilled in the art without making creative efforts shall fall within the protection scope of the present invention.

In order to explain the technical solutions in the present invention more clearly, the present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

Example 1

As shown in Figure 1, this embodiment provides a paper surface temperature online monitoring method of household paper according to the present invention, including:

101. Acquiring visible light images and infrared thermal imaging images: that is, obtaining visible light images and infrared thermal imaging images of the roll paper surface.

102. Draw a temperature measurement line on the infrared thermal imaging image, and obtain the temperature of the temperature measurement point equidistantly selected on the temperature measurement line in real time: specifically, draw a horizontal reference line on the infrared thermal imaging image as the temperature measurement line, and in the temperature measurement Select multiple points equidistantly on the line as multiple temperature measurement points, and obtain the temperature of all temperature measurement points in real time. In this embodiment, 12 points are selected equidistantly as temperature measurement points.

103. Determine whether the temperature of each temperature measurement point is between the upper threshold and the lower threshold: specifically, set the upper threshold and lower threshold of the temperature of each temperature measurement point; 105. The temperature of the temperature measurement point is greater than the upper threshold. Temperature alarm: that is, if the temperature of a certain temperature measurement point is greater than its upper threshold, an over-temperature alarm will be issued; 106. The temperature of a temperature measurement point is lower than the lower limit threshold, and a low temperature alarm will be issued: that is, if the temperature of a certain temperature measurement point is lower than its lower limit threshold , low temperature alarm.

In this embodiment, the upper and lower temperature thresholds of the 12 temperature measurement points are set to be the same, the upper thresholds are both 54 degrees Celsius, and the lower thresholds are both 48 degrees Celsius. The real-time temperature of each temperature measurement point is compared with its upper limit threshold and lower limit threshold in turn. If it exceeds 54 degrees Celsius, a paper over-temperature alarm will be issued, and if it is lower than 48 degrees Celsius, a paper low temperature alarm will be issued. In other embodiments, each temperature measurement point may have a different upper threshold and lower threshold, and those skilled in the art may determine the upper threshold and lower threshold of each temperature measurement point according to the requirements of the drying process.

104. Determine whether the temperature ranges of adjacent temperature measuring points are between the corresponding upper limit moving range threshold and lower limit moving range threshold: specifically, calculate the moving range of temperature between all adjacent temperature measuring points (moving range The difference refers to the difference between the temperature values of two consecutive temperature measurement points), respectively set the upper limit moving range threshold and the lower limit moving range threshold of adjacent temperature measuring points, when a certain moving range is greater than its upper limit moving range threshold or less than When the lower limit moves to the extreme difference threshold, a maintenance alarm will be issued.

In this embodiment, set all moving range thresholds to the same value, set the upper limit moving range threshold and the lower limit moving range threshold to 0.8 degrees Celsius and -0.8 degrees Celsius respectively, and calculate the difference between the temperatures of two adjacent temperature measuring points in real time. There are 11 moving ranges in total. When one or more of the moving ranges is greater than 0.8 degrees Celsius or less than -0.8 degrees Celsius, the overall quality and quality of the paper product is poor, and a maintenance warning needs to be issued in order to The staff inspects and maintains equipment such as drying cylinders or press rollers.

The paper surface temperature online monitoring method of household paper in this embodiment reflects the temperature of the paper surface by the temperature of the temperature measuring point, and judges whether the temperature of each temperature measuring point is between the upper limit threshold and the lower limit threshold during the drying process of the paper product. And whether each moving range is between the set upper limit moving range threshold and lower limit moving range threshold, the temperature of the temperature measuring point reflects whether the paper surface temperature at this time meets the temperature requirements in the drying process. The paper surface temperature online monitoring method aims at the disadvantages of manual inspection of the roll paper surface temperature in the drying process of paper products, such as poor reliability, poor timeliness, and low traceability. Monitoring can timely carry out over-temperature alarm or low-temperature alarm and maintenance alarm, so that the staff can adjust the drying equipment of paper products in time to ensure the safety of paper product drying process and avoid waste of resources. The paper surface temperature online monitoring method is very suitable for monitoring the roll paper surface temperature in the high-speed dehydration and drying process, which not only saves labor costs, fuel energy and raw paper fibers, but also improves the quality of household paper. quality.

The paper surface temperature online monitoring method of this embodiment also includes: 108. Judging whether the temperature mean value of each temperature measuring point is between the upper limit mean value threshold and the lower limit mean value threshold value: specifically, calculating the temperature mean value of all temperature measuring points and setting the upper limit Average value threshold and lower limit average threshold value; 109. The temperature average value is greater than the upper limit average value threshold value, and the dryer power and fan power are lowered: that is, if the temperature average value is greater than the upper limit average value threshold value, the drying cylinder power and fan power used for drying are lowered; 110. Temperature If the average value is less than the lower average threshold, increase the dryer power and fan power: if the temperature average is lower than the lower average threshold, increase the dryer power and fan power for drying.

In this embodiment, calculate the temperature average value of 12 temperature measurement points at the same time, set the upper limit average threshold value to 53 degrees Celsius, set the lower limit average value threshold value to 48.8 degrees Celsius, when the temperature average value is greater than 53 degrees Celsius, then the dryer power is too high, lower it Drying cylinder power and fan power; when the average temperature is less than 48.8 degrees Celsius, it reflects that the adjustment of the drying cylinder power is too low, and the drying cylinder power and fan power should be increased. Those skilled in the art can adjust the drying cylinder power and fan power according to the corresponding level according to the ratio of the temperature average value exceeding the upper limit average threshold value and the ratio below the lower limit average value threshold value until the temperature of the temperature measuring point on the paper surface of the roll paper returns to meet the requirements of drying. The temperature value required by the process.

The paper surface temperature online monitoring method of this embodiment also includes: 111. When more than four consecutive moving ranges are all positive or negative: that is, when more than four consecutive moving ranges are all positive or negative 112. Perform pressure imbalance alarm and automatically adjust the pressure at both ends of the press roller: that is, perform a pressure imbalance alarm at both ends of the press roller, automatically adjust the pressure at both ends of the press roller, so that the pressure at each part of the paper product is relatively state of equilibrium.

The paper surface temperature online monitoring method of the present embodiment also includes: 113. Dividing the temperature measurement points into three adjacent groups on average, and judging whether the moving range of each group is between its upper limit moving range threshold and lower limit moving range threshold : Divide all temperature measuring points into three adjacent groups on average, calculate the moving range of each group, set the upper limit moving range threshold and the lower moving range threshold of each group respectively; 114. Carry out maintenance alarm: if a certain group When the temperature extreme difference is greater than the upper limit mobile extreme difference threshold of the corresponding group or less than the lower limit mobile extreme difference threshold of the corresponding group, a maintenance alarm will be issued.

Specifically, divide the 12 temperature measurement points into three adjacent groups on average, set the same upper limit moving range threshold and lower limit moving range threshold for these three groups, set the upper limit moving range threshold and The lower limit moving range thresholds are 1 degree Celsius and -1 degree Celsius respectively, and then calculate the moving range of each group of real-time temperature, and when the temperature range of one or more groups is greater than 1 degree Celsius or less than -1 degree Celsius, a maintenance alarm will be issued , so that the staff can carry out the troubleshooting and maintenance of the drying cylinder and fan. In other implementation manners, the upper limit of the moving range threshold and the lower limit of the moving range threshold of the three groups may also be set to different values respectively.

The paper surface temperature online monitoring method of the present embodiment also includes: 115. Dividing the temperature measuring points into three adjacent groups on average, and judging whether the moving range of each group is between the upper limit moving range threshold and the lower limit moving range threshold: Specifically, all the temperature measuring points are divided into two adjacent groups on average, and the moving range of each group is calculated respectively. The two groups set the same upper limit moving range threshold and lower limit moving range threshold; Pressure at both ends: If the temperature extreme difference of one group is greater than the upper limit mobile extreme difference threshold or less than the lower limit mobile extreme difference threshold, the pressure at both ends of the press roller will be automatically adjusted.

Specifically, divide the 12 temperature measurement points into two adjacent groups on average, set the same upper limit moving range threshold and lower limit moving range threshold for these two groups, and set the upper limit moving range threshold and lower limit of the two groups The moving range thresholds are 1.5 degrees Celsius and -1.5 degrees Celsius respectively. Calculate the moving range of real-time temperature for each group. The pressure at the end makes the paper evenly pressed and improves the quality of the paper.

The process of adjusting the pressure at both ends of the press roller can be: divide the unbalance level at both ends of the press roller into 5 grades by the ratio of the moving range data exceeding the upper limit moving range threshold and the ratio lower than the lower moving range threshold , at the same time, the angle and displacement at both ends of the press roller are divided into five levels, and the unbalance levels correspond to the angle and displacement levels respectively. The position and displacement grade data of the end of the press roller, and adjust the position and displacement of the two ends of the press roller accordingly.

Referring to Fig. 1, in the paper surface temperature online monitoring method of the present embodiment, step 103 (temperature measuring point temperature detection) and its execution step and step 104 (moving extreme difference detection of temperature between adjacent temperature measuring points) and its execution The steps are judged in parallel. In other implementation manners, the judgment of step 103 can be performed first, and then the judgment of step 104 can be performed; or, the judgment of step 104 can be performed first, and then the judgment of step 103 can be performed.

It should be noted that step 113 and step 115 may be performed after judging steps 103 , 104 , 108 , 111 and their execution steps, or may be executed in parallel with judging steps 103 and 104 .

Example 2

Referring to Figures 2 to 5, this embodiment provides an online paper surface temperature monitoring system for household paper. The paper surface temperature online monitoring system can implement the paper surface temperature online monitoring method in Example 1. The paper surface temperature online monitoring The system includes: a high-definition thermal imaging dual-light camera 1, a network switching device 2, a monitoring terminal 3, and an image storage device 4; wherein, the network switching device 2 can be a switch or a router, and the monitoring terminal 3 can be a computer or a server; Figure 4 and Figure 5 The schematic diagrams of the main interface of the client and the web end of the monitoring terminal 3 are shown respectively; each curve in the temperature curve in Fig. 4 is a temperature curve at the same point at different times;

The high-definition thermal imaging dual-light camera 1 is used to acquire the visible light image and infrared thermal imaging image of the roll paper surface, and send the visible light image and infrared thermal imaging image to the monitoring terminal 3 and the image storage device 4 through the network switching device 2; specifically , the high-definition thermal imaging dual-light camera 1 communicates with the monitoring terminal 3 and the image storage device 4 through the modbus tcp protocol and the router/switch;

The monitoring terminal 3 is used to draw a horizontal reference line on the infrared thermal imaging image as a temperature measurement line, and select multiple points equidistantly on the temperature measurement line as a plurality of temperature measurement points 7-1; in this embodiment, select The number of temperature measuring points is 12;

The monitoring terminal 3 controls the temperature of multiple temperature measurement points 7-1 obtained by the high-definition thermal imaging dual-light camera 1 in real time through the network switching device 4, and sends the temperature data of the multiple temperature measurement points 7-1 to the image storage device 4;

The monitoring terminal 3 is also used to display visible light images, infrared thermal imaging images and temperature data of multiple temperature measurement points 7-1 in real time; the monitoring terminal 3 is also used to set the upper limit threshold and the lower limit threshold value of each temperature measurement point temperature. If the temperature of a temperature measuring point 7-1 is greater than its upper limit threshold, an over-temperature alarm will be given; if the temperature of a certain temperature measuring point 7-1 is lower than its lower limit threshold, a low temperature alarm will be given; the monitoring terminal 3 can be connected to a buzzer or light Devices such as diodes can send out sound or light signals for alarming, among which over-temperature alarms and low-temperature alarms can send out different sound or light signals.

The monitoring terminal 3 is also used to calculate the moving range of temperature between all adjacent temperature measuring points 7-1, respectively set the upper limit moving range threshold and the lower limit moving range threshold of adjacent temperature measuring points 7-1, when a certain When the moving range is greater than its upper limit moving range threshold or less than its limit moving range threshold, a maintenance alarm will be given. Similarly, the monitoring terminal 3 can be connected to an alarm device to perform alarms in different forms from over-temperature alarms and low-temperature alarms;

The image storage device 4 is used to store visible light images, infrared thermal imaging images and temperature data of multiple temperature measurement points 7-1.

The paper surface temperature online monitoring system of household paper in this embodiment, aiming at the disadvantages of poor reliability, poor timeliness, and low traceability of manual inspection of the roll paper surface temperature during the paper drying process, adopts a high-definition thermal imaging dual-light camera to obtain temperature measurement The temperature at point 7-1 can be monitored in real time and accurately at multiple points on the roll paper surface, and the monitoring terminal can be used to judge whether the temperature at temperature measurement point 7-1 meets the requirements, and the temperature alarm and maintenance alarm will be carried out in time, so that the staff can timely Adjust the drying equipment of paper products to ensure the safety of paper product drying process and avoid waste of resources. This paper surface temperature online monitoring system is very suitable for monitoring the paper surface temperature of roll paper in the dehydration and drying process running at high speed. It not only saves labor costs, fuel energy and virgin paper fibers, but also improves the quality of household paper. quality.

It should be noted that A and B in FIG. 2 represent the paper inlet and paper outlet respectively, D is the paper inlet of the roll paper, and C is the air inlet of the fan 5 .

In the present embodiment, the paper surface temperature online monitoring system also includes: a blower fan 5 and a drying cylinder 6 for drying, and a PLC controller; the monitoring terminal 3 is used to calculate the average temperature of all temperature measurement points 7-1, and set the upper limit average value Threshold and lower limit average threshold, if the temperature average is greater than the upper limit average threshold, the monitoring terminal 3 controls the PLC controller to lower the power of the drying cylinder 6 and the fan 5; if the temperature average is less than the lower limit average threshold, the monitoring terminal 3 controls the PLC controller to increase the drying Cylinder 6 power and fan 5 power.

The paper surface temperature online monitoring system of this embodiment also includes: a press roller for pressing paper products. When more than four consecutive moving ranges are all positive or negative, the monitoring terminal 3 is used to press the press roller. The pressure imbalance alarm at both ends, and control the PLC controller to adjust the pressure at both ends of the press roller.

The monitoring terminal 3 of this embodiment is also used to divide all the temperature measurement points 7-1 into more than three adjacent groups on average, calculate the movement range of each group, and set the upper limit movement range threshold and the lower limit movement of each group respectively Range threshold, if the temperature range of a certain group is greater than the upper limit moving range threshold of the corresponding group or less than the lower limit moving range threshold of the corresponding group, a maintenance alarm will be issued. Similarly, the monitoring terminal 3 can be connected to the alarm device for maintenance Call the police.

The monitoring terminal 3 of this embodiment divides all the temperature measuring points 7-1 into two adjacent groups on average, and calculates the moving range of each group respectively. The two groups set the same upper limit moving range threshold and lower limit moving range threshold, If the temperature extreme difference of one group is greater than the upper limit mobile extreme difference threshold or less than the lower limit mobile extreme difference threshold, the monitoring terminal 3 is used to control the PLC controller to adjust the pressure at both ends of the press roller.

The way to adjust the pressure at both ends of the press roller through the monitoring terminal 3 can be: the temperature monitoring software of the monitoring terminal 3 moves the extreme difference data to divide the unbalance level at both ends of the press roller into 5 levels, and at the same time the angle at both ends of the press roller and displacement are divided into 5 levels, and the unbalance level corresponds to the angle and displacement level respectively. Firstly, the pressure unbalance level at both ends of the press roller is obtained through the moving range data, and the monitoring terminal 3 collects the pressure unbalance level data at both ends of the press roller It is transmitted to the PLC controller. The PLC controller obtains the position and displacement level data of both ends of the press roller through the level correspondence, and controls and adjusts the position and displacement of the two ends of the press roller through the PLC controller to the motor of the press roller.

Finally, it can be understood that the above implementations are only exemplary implementations adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, without departing from the principle and essence of the present invention, various modifications and improvements can be made, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (10)

1. A paper surface temperature online monitoring method of household paper is characterized by comprising the following steps:

acquiring a visible light image and an infrared thermal imaging image of the paper surface of the roll paper;

drawing a horizontal reference line on the infrared thermal imaging image as a temperature measuring line, selecting a plurality of points at equal distances on the temperature measuring line as a plurality of temperature measuring points, and acquiring the temperatures of all the temperature measuring points in real time;

setting an upper threshold and a lower threshold of the temperature of each temperature measuring point, and if the temperature of a certain temperature measuring point is greater than the upper threshold, performing overtemperature alarm; if the temperature of one temperature measuring point is smaller than the lower limit threshold value, low-temperature alarm is carried out;

and calculating the movement range of the temperature between all adjacent temperature measuring points, respectively setting an upper limit movement range threshold and a lower limit movement range threshold of the adjacent temperature measuring points, and carrying out maintenance alarm when a certain movement range is larger than the upper limit movement range threshold or smaller than the lower limit movement range threshold.

2. The paper surface temperature on-line monitoring method according to claim 1, characterized in that, calculating the temperature average value of all the temperature measuring points, setting an upper average value threshold and a lower average value threshold, if the temperature average value is larger than the upper average value threshold, reducing the drying cylinder power and the fan power for drying; and if the temperature average value is smaller than the lower limit average value threshold value, increasing the power of a drying cylinder and the power of a fan for drying.

3. A paper surface temperature on-line monitoring method as claimed in claim 1, wherein when the continuous more than four said movement range are all positive values or all negative values, alarm of pressure imbalance at both ends of the press roll is performed, and the pressure at both ends of the press roll is automatically adjusted.

4. The method of claim 1, wherein all the temperature measurement points are equally divided into three or more adjacent groups, each group includes calculating the motion range of each group, respectively, setting an upper limit motion range threshold and a lower limit motion range threshold of each group, and performing a maintenance alarm if the temperature range of a certain group is greater than the upper limit motion range threshold of the corresponding group or less than the lower limit motion range threshold of the corresponding group.

5. The paper surface temperature on-line monitoring method according to claim 1, characterized in that all the temperature measuring points are equally divided into two adjacent groups, the moving range of each group is calculated respectively, the two groups are provided with the same upper moving range threshold value and lower moving range threshold value, and if the temperature range of one group is larger than the upper moving range threshold value or smaller than the lower moving range threshold value, the pressure at the two ends of the pressing roller is automatically adjusted.

6. The utility model provides a paper temperature on-line monitoring system of household paper which characterized in that includes: the system comprises a high-definition thermal imaging double-optical camera, network switching equipment, a monitoring terminal and image storage equipment;

the high-heat-clearing imaging double-light camera is used for acquiring a visible light image and an infrared thermal imaging image of the paper surface of roll paper, and sending the visible light image and the infrared thermal imaging image to the monitoring terminal and the image storage device through the network switching device;

the monitoring terminal is used for drawing a horizontal reference line on the infrared thermal imaging image as a temperature measuring line, and selecting a plurality of points at equal distances on the temperature measuring line as a plurality of temperature measuring points;

the monitoring terminal controls the temperatures of the plurality of temperature measuring points acquired by the high-heat-clearing imaging double-light camera in real time through the network switching equipment, and sends the temperature data of the plurality of temperature measuring points to the image storage equipment through the network switching equipment;

the monitoring terminal is also used for displaying the visible light image, the infrared thermal imaging image and the temperature data of the plurality of temperature measuring points in real time; the monitoring terminal is also used for setting an upper threshold and a lower threshold of the temperature of each temperature measuring point, and if the temperature of a certain temperature measuring point is greater than the upper threshold, overtemperature alarm is carried out; if the temperature of one temperature measuring point is smaller than the lower limit threshold value, low-temperature alarm is carried out;

the monitoring terminal is further used for calculating the movement range of the temperature between all adjacent temperature measuring points, respectively setting the upper limit movement range threshold and the lower limit movement range threshold of the adjacent temperature measuring points, and carrying out maintenance alarm when a certain movement range is larger than the upper limit movement range threshold or smaller than the lower limit movement range threshold.

The image storage device is used for storing the visible light image, the infrared thermal imaging image and the temperature data of the plurality of temperature measuring points.

7. The paper surface temperature on-line monitoring system of claim 6, further comprising: a fan and a drying cylinder for drying, and a PLC controller; the monitoring terminal is used for calculating the temperature mean value of all the temperature measuring points, setting an upper limit mean value threshold value and a lower limit mean value threshold value, and if the temperature mean value is larger than the upper limit mean value threshold value, the monitoring terminal controls the PLC to reduce the drying cylinder power and the fan power; and if the temperature average value is smaller than the lower limit average value threshold value, the monitoring terminal controls the PLC to increase the drying cylinder power and the fan power.

8. The paper surface temperature on-line monitoring system according to claim 7, further comprising: the squeezing roller is used for squeezing paper products, when the movement range is positive or negative continuously more than four, the monitoring terminal is used for alarming the pressure imbalance at the two ends of the squeezing roller and controlling the PLC to adjust the pressure at the two ends of the squeezing roller.

9. The paper surface temperature on-line monitoring system of claim 6, wherein the monitoring terminal is further configured to divide all the temperature measurement points into three or more adjacent groups, calculate the motion range of each group, set an upper motion range threshold and a lower motion range threshold of each group, and issue an inspection alarm if the temperature range of a certain group is greater than the upper motion range threshold of the corresponding group or less than the lower motion range threshold of the corresponding group.

10. The paper surface temperature on-line monitoring system according to claim 7, wherein the monitoring terminal is further configured to divide all the temperature measuring points into two adjacent groups, calculate the moving range of each group respectively, and the two groups are set to have the same upper moving range threshold and lower moving range threshold, and if the temperature range of one of the groups is greater than the upper moving range threshold or smaller than the lower moving range threshold, the monitoring terminal is configured to control the PLC controller to adjust the pressures at the two ends of the squeezing roller.

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