Roller surface temperature measuring structure of calendering roller

Abstract

The utility model discloses a roller surface temperature measurement structure of a calender roller, the measurement object of a temperature measurement element is the inner wall of the calender roller with lower degree of finish than the roller surface, and the temperature measurement element is positioned in the calender roller with more closed space and higher and more stable temperature than the external environment, so that the influence of factors such as the degree of finish and the environment temperature on the temperature measurement can be better avoided; the detection end of the temperature measurement element is abutted against and fixed on the inner wall of the calendering roller, and heat of the inner wall of the calendering roller is directly transmitted to the detection end of the temperature measurement element, so that the temperature measurement of the temperature measurement element can better avoid the influence of the measurement distance and the environment temperature; a comparison table of the wall thickness of the calendaring roller and the temperature compensation value is preset in the temperature measurement output equipment, during use, the temperature measurement output equipment selects the temperature compensation value according to the current wall thickness of the calendaring roller, and the temperature value obtained by converting an electric signal fed back by the temperature measurement element is combined with the temperature compensation value and then output, so that the output value is closer to the real roller surface temperature; and the reliability of a temperature measurement result is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of glass calendering manufacturing, specifically relates to a calender roll surface temperature measuring structure. BACKGROUND

[0002] Glass calendering forming is to guide the molten glass liquid into the calendering machine, so that the glass liquid is extruded, stretched and cooled to form the required thickness of the strip-shaped glass through the nip between two parallel calendering rollers; in the process of calendering forming, especially when the glass liquid temperature is greater than 1050 DEG C in the ultra-thin microcrystalline glass forming, the roll surface of the calendering roller is prone to sticking, sticking edge, shutdown and roll deformation due to the excessively high temperature.

[0003] To prevent the occurrence of the above situations, it is necessary to use a temperature meter, a temperature gun or a temperature sensor to measure the roll surface temperature in real time during the process of calendering forming, so as to timely adjust the production conditions, thereby ensuring the smooth progress of calendering forming; such as the device for measuring the temperature of the outer wall of the calendering roller for calendering glass forming disclosed in Chinese patent CN216785978U, which measures the roll surface temperature by fixing the temperature sensor on the outer wall of the calendering roller with a support, but in this scheme, the temperature measurement is easily affected by the measurement distance, the roll surface finish and the environmental temperature and other factors, resulting in large measurement error; Chinese patent CN110587888A discloses a calendering machine capable of accurately measuring temperature, which sets a dovetail groove at the edge of the calendering roller and embeds the temperature sensor in the dovetail groove for temperature measurement, which can better avoid the influence of the measurement distance, the roll surface finish and the environmental temperature and other factors, but in this scheme, not only the installation of the temperature sensor requires high movement accuracy of the calendering roller, but also the temperature sensor can only measure the temperature of the edge of the calendering roller, which has great limitations in measurement and is difficult to meet the use requirements.

[0004] Therefore, in order to make the calendering forming proceed smoothly and improve the glass forming quality, it is necessary to design a calendering roller roll surface temperature measuring structure with high measurement accuracy. SUMMARY

[0005] In view of the above shortcomings of the prior art, the utility model aims to provide a calendering roller roll surface temperature measuring structure to solve the technical problem that the current roll surface temperature measurement method cannot meet the use requirements, and achieve the effect of improving the measurement accuracy and the glass forming quality.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The application discloses a calender roll surface temperature measuring structure, which comprises a calender roll and a temperature measuring unit, wherein the temperature measuring unit comprises a temperature measuring element and a temperature measuring output device; the temperature measuring element is located in the tube cavity of the calender roll and has a detection end facing the inner wall of the calender roll, so as to convert the temperature of the calender roll into an electric signal; and the temperature measuring output device is arranged outside the calender roll and is electrically connected with the temperature measuring element, so as to restore the electric signal fed back by the temperature measuring element into a temperature value and output the temperature value.

[0008] Further, the calender roll is provided with a plurality of temperature measuring elements which are distributed along the axial direction of the calender roll.

[0009] Further, the calender roll is provided with a plurality of circumferential temperature measuring groups which are distributed along the circumferential direction of the calender roll, each of the circumferential temperature measuring groups comprising a plurality of temperature measuring elements which are uniformly distributed along the circumferential direction of the calender roll.

[0010] Further, all the temperature measuring elements are divided into a plurality of axial temperature measuring groups which are distributed along the axial direction of the calender roll, each of the axial temperature measuring groups comprising a plurality of temperature measuring elements which are uniformly distributed along the axial direction of the calender roll.

[0011] Further, the number of the temperature measuring elements in each circumferential temperature measuring group is n=R / 10, wherein n is an integer, and R is the radius of the calender roll.

[0012] Further, the detection end of the temperature measuring element is in abutment with and fixed to the inner wall of the calender roll.

[0013] Further, the calender roll surface temperature measuring structure further comprises a rotary connector which is fixedly arranged at one end of the calender roll, and the fixed connecting end and the rotary connecting end of the rotary connector are connected with the temperature measuring element and the temperature measuring output device through wires respectively.

[0014] Further, the temperature measuring element is electrically connected with the temperature measuring output device through wires, and the temperature measuring output device is synchronously rotationally connected at one end of the calender roll.

[0015] Further, the temperature measuring element is a thermocouple.

[0016] Further, the temperature measuring output device is a PLC.

[0017] Compared with the prior art, the calender roll surface temperature measuring structure has the following beneficial effects:

[0018] Compared with the prior art, the calender roll surface temperature measuring structure has the following beneficial effects:1. The calender roll surface temperature measuring structure, the measuring object of the temperature measuring element is the inner wall of the calender roll with lower smoothness, and the temperature measuring element is located in the relatively closed space and the inner part of the calender roll with higher and more stable temperature than the external environment, so that the influence of smoothness and environmental temperature on temperature measurement can be better avoided, and the temperature measurement accuracy can be improved; in the case that the thickness of the calender roll wall is small, the inner wall temperature of the calender roll is close to the roll surface temperature, which can be used as the roll surface temperature output, so as to timely adjust the production condition, reduce the possibility of roll sticking, edge sticking, shutdown and roll deformation, and ensure the smooth progress of the calendering.

[0019] 2. The calender roll surface temperature measuring structure, the detection end of the temperature measuring element is abutted and fixed on the inner wall of the calender roll, and the heat of the inner wall of the calender roll is directly transmitted to the detection end of the temperature measuring element, so that the temperature measurement of the temperature measuring element can better avoid the influence of measurement distance and environmental temperature, and the temperature measurement of the temperature measuring element is more accurate and reliable; in addition, a comparison table of the thickness of the calender roll wall and the temperature compensation value is pre-set in the temperature output device, and when in use, the temperature output device selects the temperature compensation value according to the thickness of the current calender roll, combines the temperature value converted from the electric signal fed back by the temperature measuring element and the temperature compensation value, and then outputs, so that the output value is closer to the real roll surface temperature, and the reliability of the temperature measurement result can be improved.

[0020] 3. The calender roll surface temperature measuring structure, a plurality of circumferential temperature measuring groups are arranged in the calender roll along the axial direction, the circumferential temperature measuring group comprises a plurality of temperature measuring elements uniformly distributed along the circumference of the calender roll, and the temperature output device is arranged to output the temperature of each part of the calender roll along the axial direction; the average value of the temperatures measured by all the temperature measuring elements of the circumferential temperature measuring group corresponding to the axial position can be taken as the output when the temperature output device outputs the average value of the temperatures of each part of the calender roll along the axial direction, so that the accuracy and stability of the fixed-point temperature measurement can be effectively improved; when the temperature output device outputs the average value of the temperatures of each part of the calender roll along the axial direction, the average value of the temperatures measured by all the temperature measuring elements can be taken as the output, so that the accuracy and reliability of the overall temperature measurement can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The schematic view of the calender roll surface temperature measuring structure of the embodiment;

[0022] Figure 2 The schematic view of the temperature measuring unit of the embodiment;

[0023] Figure 3 The sectional view of the water-cooled shunt cylinder in the calender roll of the embodiment;

[0024] Figure 4 The side view of the calender roll of the embodiment;

[0025] The calender roller 1, the temperature measuring unit 2, the temperature measuring element 21, the thermocouple 22, the temperature measuring output device 23, the wire 24, the water-cooled shunt cylinder 31, the shunt hole 32 and the connecting rib 33. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0027] Embodiment

[0028] Please see Figure 1 and Figure 2 A calender roller surface temperature measuring structure, comprising a calender roller 1 and a temperature measuring unit 2, the calender roller 1 is in a cylindrical shape, the temperature measuring unit 2 comprises a temperature measuring element 21 and a temperature measuring output device 23, the temperature measuring element 21 is located in the calender roller 1, the detection end of the temperature measuring element 21 faces the inner wall of the calender roller 1, so as to convert the temperature of the calender roller 1 into an electric signal, the temperature measuring output device 23 is arranged outside the calender roller 1 and is electrically connected with the temperature measuring element 21, so as to restore the electric signal fed back by the temperature measuring element 21 into a temperature value and output.

[0029] The calender roller surface temperature measuring structure, unlike the prior art roller surface temperature measuring scheme which directly measures the roller surface temperature by arranging the temperature measuring element 21 outside the calender roller 1, the utility model is arranged inside the calender roller 1, the temperature measuring element 21 converts the inner wall temperature of the calender roller 1 into an electric signal and feeds back to the temperature measuring output device 23, and the temperature measuring output device 23 restores the electric signal into a temperature value; in the utility model, the measurement object of the temperature measuring element 21 is the calender roller 1 inner wall with lower smoothness than the roller surface, and the temperature measuring element 21 is located inside the calender roller 1 which is relatively closed in space and has higher and more stable temperature than the external environment, so that the temperature measurement of the temperature measuring element 21 can better avoid the influence of factors such as smoothness and environmental temperature, and is beneficial to improve the temperature measurement accuracy; in order to improve the uniformity of the roller surface temperature and ensure the glass calendering forming quality, the calender roller 1 is usually made of a material with good thermal conductivity, such as martensitic stainless steel containing chromium, therefore, under the condition that the wall thickness of the calender roller 1 is small, the inner wall temperature of the calender roller 1 is relatively close to the roller surface temperature, and the measured inner wall temperature can be output as the roller surface temperature; in order to make the output measurement result more accurate, a temperature compensation value can be pre-set in the temperature measuring output device 23 according to the wall thickness of the calender roller 1 during actual use, the temperature value converted from the electric signal fed back by the temperature measuring element 21 is combined with the temperature compensation value and then output, so that the output value is closer to the real roller surface temperature; so as to timely adjust the production conditions and reduce the possibility of sticking, sticking, stopping and roller deformation, thereby ensuring the smooth progress of the calendering forming; the utility model can effectively solve the problem that the current roller surface temperature measurement method cannot meet the use requirements, and achieve the effects of improving the measurement accuracy and the glass forming quality.

[0030] In one embodiment, the calender roller 1 has a plurality of temperature measuring elements 21 and is distributed along the axial direction of the calender roller 1; in this way, the temperature measuring output device 23 can be programmed and designed and connected with a control switch during implementation, and the temperature measuring output device 23 can be controlled to output the temperature of each part of the calender roller 1 along the axial direction through the plurality of temperature measuring elements 21 during use, so as to realize the spot temperature measurement of the calender roller 1 along the axial direction, and the temperature measuring output device 23 can also output the average temperature of all the temperatures measured by the plurality of temperature measuring elements 21, that is, the average temperature of each part along the axial direction, so as to realize the overall temperature measurement of the calender roller 1; the temperature measuring output device 23 is matched with the plurality of temperature measuring elements 21, so as to realize the spot temperature measurement and the overall temperature measurement of the calender roller 1, and the calender roller surface temperature measuring structure is more flexible to use, so as to comprehensively grasp the temperature of the calender roller 1, thereby corresponding to adjust the production conditions and improve the stability and production quality of the calendering production.

[0031] In another embodiment, please refer to Figure 1 and Figure 4, the calender roller 1 has a plurality of circumferential temperature measurement groups distributed along the axial direction of the calender roller 1, each circumferential temperature measurement group includes a plurality of temperature measurement elements 21 and is uniformly distributed along the circumferential direction of the calender roller 1; in this way, since the calender roller 1 rotates during operation, whether the temperature measurement elements 21 rotate synchronously with the calender roller 1 or rotate relatively, the temperature measurement elements 21 can only measure the temperature at one circumferential position at the axial position thereof, therefore, the utility model discloses that a plurality of circumferential temperature measurement groups are arranged along the axial direction in the calender roller 1, each circumferential temperature measurement group has a plurality of temperature measurement elements 21 uniformly distributed in the circumferential direction; in this way, when the temperature measurement output device 23 outputs the temperature at each position in the axial direction of the calender roller 1, the average of all the temperatures measured by all the temperature measurement elements 21 in the circumferential temperature measurement group corresponding to the axial position can be taken as the output, thereby improving the accuracy and reliability of point temperature measurement; when the temperature measurement output device 23 outputs the average of the temperatures at each position in the axial direction of the calender roller 1, the average of the temperatures measured by all the temperature measurement elements 21 in each circumferential temperature measurement group can be taken as the output, thereby improving the accuracy and reliability of overall temperature measurement.

[0032] During implementation, the number of temperature measurement elements 21 included in the circumferential temperature measurement group 21 can be determined according to the formula n = R / 10, n is the number of temperature measurement elements 21 included in the circumferential temperature measurement group 21, and is an integer, and R is the radius of the calender roller 1, in mm; in this way, the number of temperature measurement elements 21 uniformly distributed in the circumferential direction at the same axial position is determined according to the radius of the calender roller 1, so that the circumferential spacing of the temperature measurement elements 21 is appropriate, so as to control the number of temperature measurement elements 21 while ensuring to improve the accuracy and reliability of temperature measurement, thereby saving costs.

[0033] In order to meet the production needs, the calender roller 1 is generally also provided with a cooling device to cooperate with the temperature measurement structure to realize the regulation and control of the temperature of the calender roller 1; please refer to Figure 3 and Figure 4 In the embodiment, a water-cooled shunt cylinder 31 is coaxially arranged in the calender roller 1, one end of the water-cooled shunt cylinder 31 is closed, the other end of the water-cooled shunt cylinder 31 extends out of the calender roller 1 as a water inlet, a plurality of shunt holes 32 are uniformly distributed on the water-cooled shunt cylinder 31, the shunt holes 32 communicate the inside of the water-cooled shunt cylinder 31 and the inside of the calender roller 1, one end of the calender roller 1 is connected with a water outlet, the water-cooled shunt cylinder 31 has a circumferentially distributed connecting rib 33 outside, and the two ends of the connecting rib 33 are respectively connected with the outer side of the water-cooled shunt cylinder 31 and the inner wall of the calender roller 1; during use, a water supply pipe is connected with the water inlet, and a drain pipe is connected with the water outlet, cooling water is transported into the water-cooled shunt cylinder 31 through the water supply pipe, the cooling water uniformly enters the inner cavity of the calender roller 1 outside the water-cooled shunt cylinder 31 through the shunt holes 32, part of the heat of the calender roller 1 is transferred to the cooling water, and the cooling water finally flows out of the drain pipe through the water outlet, so as to take out part of the heat of the calender roller 1, thereby realizing the cooling control of the calender roller 1.

[0034] In the premise of setting the cooling device in the calender roll 1, if the detection end of the temperature measuring element 21 has a spacing with the inner wall of the calender roll 1, the cooling water is easy to affect the temperature measurement, therefore, please refer to Figure 1 and Figure 4 In the embodiment, in the radial direction, the temperature measuring element 21 is located between the inner wall of the calender roll 1 and the water-cooled shunt cylinder 31, the detection end of the temperature measuring element 21 abuts and is fixed with the inner wall of the calender roll 1, and the wiring end of the temperature measuring element 21 has a spacing with the water-cooled shunt cylinder 31; in the circumferential direction, the temperature measuring element 21 is alternately distributed with the connecting ribs 33; in this way, the heat of the inner wall of the calender roll 1 is directly transmitted to the detection end of the temperature measuring element 21, so that the temperature measurement of the temperature measuring element 21 can better avoid the influence of the measurement distance and the ambient temperature, and the measurement of the temperature measuring element 21 is more accurate and reliable; in addition, the temperature measuring element 21 is fixedly connected with the inner wall of the calender roll 1, the temperature measuring element 21 rotates synchronously with the calender roll 1, and the temperature measuring element 21 always measures the temperature at the same position of the inner wall of the calender roll 1; in use, not only the temperature at the position where the calender roll 1 is in extrusion contact with the glass liquid can be obtained in combination with the rotation angle of the calender roll 1, but also the temperature at the same position on the calender roll 1 can be analyzed according to the temperature measured by the same temperature measuring element 21 at different rotation angles of the calender roll 1, so as to provide a data basis for the whole production condition and improve the glass calendering forming quality.

[0035] Since the detection end of the temperature measuring element 21 is fixed with the inner wall of the calender roll 1, the temperature measuring element 21 rotates with the calender roll 1, therefore, in order to ensure that the temperature measuring element 21 is effectively electrically connected with the temperature measuring output device 23, in implementation, a rotary connector can be fixedly arranged at one end of the calender roll 1, and the fixed wiring end and the rotary wiring end of the rotary connector are connected with the temperature measuring element 21 and the temperature measuring output device 23 through the lead wire 24 respectively; in this way, the temperature measuring element 21 rotating synchronously with the calender roll 1 is electrically connected with the temperature measuring output device 23 through the rotary connector, which not only ensures that the temperature measuring element 21 is effectively electrically connected with the temperature measuring output device 23, but also enables the temperature measuring output device 23 to not rotate with the calender roll 1, so as to flexibly arrange the temperature measuring output device 23, which is conducive to improving the practicability of the calender roll surface temperature measuring structure; in order to display the measured temperature, the temperature measuring output device 23 can have a display screen for displaying the measured temperature by itself, or an external display can be connected for temperature display.

[0036] Further, all the temperature measuring elements 21 are also divided into multiple axial temperature measuring groups distributed along the circumferential direction of the calender roll 1, each axial temperature measuring group includes multiple temperature measuring elements 21 and is uniformly distributed along the axial direction of the calender roll; in this way, corresponding to the temperature at each place in the axial direction of the output calender roll 1, the temperature measuring output device 23 can also control the average value of the temperatures measured by all the temperature measuring elements 21 in each axial temperature measuring group as the output, that is, corresponding to the temperature at each place in the circumferential direction of the output calender roll 1, so as to master the temperature change analysis of the roll surface in the circumferential direction when the calender roll 1 rotates, and to better perform process adjustment subsequently.

[0037] Optionally, the temperature measuring element 21 is electrically connected with the temperature measuring output device 23 through the wire 24, and the temperature measuring output device 23 is synchronously rotationally connected at one end of the calendering roller 1; in this way, the temperature measuring output device 23 and the temperature measuring element 21 are synchronously rotated with the calendering roller 1 to ensure the effectiveness of the electrical connection between the temperature measuring element 21 and the temperature measuring output device 23 through the wire 24; since the temperature measuring output device 23 is synchronously rotated with the calendering roller 1, the temperature measuring output device 23 can be optionally wirelessly connected with a display at this time to display the measured temperature,

[0038] In the embodiment, the temperature measuring element 21 adopts a thermocouple 22; two conductors or semiconductors A and B of different materials are welded to form a closed loop, when there is a temperature difference between the conductors A and B, an electromotive force is generated between the two, thereby forming a corresponding current in the loop, which phenomenon is called thermoelectric effect; the thermocouple 22 works by utilizing this effect, compared with conventional temperature sensors, the thermocouple 22 has the advantages of high precision, fast response and high temperature resistance, etc., the thermocouple 22 is selected as the temperature measuring element 21 and is arranged in the high-temperature calendering roller 1, and the measuring end of the thermocouple 22 is in contact with the inner wall of the calendering roller 1, the inner wall temperature of the calendering roller 1 is measured through the heat transfer principle, which is conducive to improving the accuracy and timeliness of temperature measurement, so as to adjust the production conditions in time according to the temperature of the calendering roller 1.

[0039] In the embodiment, the temperature measuring output device 23 adopts a PLC; in this way, the PLC (programmable logic controller) has the advantages of high reliability, strong anti-interference ability, simple programming and strong expansibility, etc., the PLC is selected as the temperature measuring output device 23 and is arranged in the glass production workshop with a relatively harsh working environment, which is conducive to ensuring the stability of the calendering roller surface temperature measuring structure; since the PLC has strong expansibility, it is convenient to enrich the functions of the calendering roller surface temperature measuring structure by adding electrical elements in the later stage, so that the calendering roller surface temperature measuring structure has better practicality, in addition, under the condition that the conditions permit, a PLC can be selected to be shared with the calendering equipment, so as to save costs.

[0040] Since the object measured by the temperature measuring element is the inner wall of the calendering roller, the heat transfer between the roller surface and the inner wall is affected by the wall thickness, although in the case of small wall thickness, the inner wall temperature is close to the roller surface temperature, but it is lower than the roller surface temperature, and with the increase of the wall thickness, the difference between the inner wall temperature and the roller surface temperature will also increase; therefore, regarding the above-mentioned temperature compensation value, the calendering roller with the material of 1Cr12Wmov is taken as an example, the inner wall temperature of the calendering roller under different wall thickness conditions is measured by the calendering roller surface temperature measuring structure, the roller surface temperature is measured by a conventional temperature measuring instrument multiple times and the average value is taken, and the comparison table is as follows:

[0041] Calender roll wall thickness / mm Inner wall temperature / °C Roll surface temperature / °C Temperature difference / °C 70 450 620 170 60 400 550 150 50 330 450 120 40 290 400 110 30 250 350 100 20 210 300 90 10 170 250 80

[0042] The analysis shows that the temperature difference between the roll surface temperature and the inner wall temperature decreases with the decrease of the wall thickness, in the embodiment, the temperature difference between the inner wall and the roll surface in the table is taken as the temperature compensation value and is compared with the corresponding wall thickness to form a comparison table and is introduced into the temperature measurement output device, in actual use, the roll surface temperature measurement structure of the calendering roll, the temperature measurement output device selects the corresponding temperature compensation value from the comparison table according to the current wall thickness of the calendering roll, adds the temperature compensation value to the temperature value converted from the electrical signal fed back by the temperature measurement element and then outputs, so that the measurement result output is more accurate.

[0043] To further illustrate and verify the use effect of the roll surface temperature measurement structure of the calendering roll, the roll surface temperature is directly measured by using a conventional temperature measurement instrument, and the data is recorded in groups, and then the roll surface temperature is measured by using the roll surface temperature measurement structure of the calendering roll, and the data is recorded in groups.

[0044] Using a conventional temperature measurement instrument:

[0045] Actual roll surface temperature Measured temperature Temperature difference: °C 625 595 30 560 532 28 448 412 36 411 381 30 361 329 32 312 290 22 249 211 38

[0046] Using the roll surface temperature measurement structure of the calendering roll:

[0047] Actual roll surface temperature Measured temperature Temperature difference: °C 625 620 5 560 556 4 453 448 5 411 407 4 361 353 8 312 306 6 255 249 6

[0048] Through the comparison and analysis of the above two tables, it can be seen that, compared with directly measuring the roll surface temperature by using a conventional temperature measurement instrument, the temperature difference between the roll surface temperature measured by the roll surface temperature measurement structure of the calendering roll and the actual roll surface temperature is smaller, and the accuracy is higher, which is convenient for timely adjusting the production conditions according to the roll surface temperature, reducing the possibility of sticking, sticking, stopping and roll deformation, so as to ensure the smooth progress of the calendering forming; therefore, the roll surface temperature measurement structure of the calendering roll can effectively solve the problem that the current roll surface temperature measurement method cannot meet the use requirements, and is conducive to improving the measurement accuracy and the glass forming quality.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the technical solutions, and those skilled in the art should understand that those who modify or equivalently replace the technical solutions of the present application without departing from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. A temperature measuring structure for the surface of a calendering roll, characterized in that: It includes a calendering roll and a temperature measuring unit. The temperature measuring unit includes a temperature measuring element and a temperature measuring output device. The calendering roll is tubular and the temperature measuring element is located inside the tube of the calendering roll. The detection end of the temperature measuring element faces the inner wall of the calendering roll to convert the temperature of the calendering roll into an electrical signal. The temperature measuring output device is located outside the calendering roll and is electrically connected to the temperature measuring element to restore the electrical signal fed back by the temperature measuring element into a temperature value and output it.

2. The calender roll surface temperature measuring structure according to claim 1, characterized in that: There are multiple temperature measuring elements inside the calender roll and they are distributed along the axial direction of the calender roll.

3. The temperature measuring structure for the surface of a calendering roll according to claim 1, characterized in that: There are multiple circumferential temperature measuring groups distributed along the axial direction of the calender roll inside the calender roll. Each circumferential temperature measuring group includes multiple temperature measuring elements and is evenly distributed along the circumference of the calender roll.

4. The calender roll surface temperature measuring structure according to claim 3, characterized in that: All temperature measuring elements are further divided into multiple axial temperature measuring groups distributed along the circumference of the calender roll. Each axial temperature measuring group includes multiple temperature measuring elements and is evenly distributed along the axial direction of the calender roll.

5. The temperature measuring structure for the surface of a calendering roll according to claim 3, characterized in that: The number of temperature measuring elements included in the circumferential temperature measuring group is n = R / 10, where n is an integer and R is the radius of the calendering roll.

6. The temperature measuring structure for the surface of a calendering roll according to claim 1, characterized in that: The sensing end of the temperature sensing element abuts against and is fixed to the inner wall of the calendering roll.

7. The calender roll surface temperature measuring structure according to claim 6, characterized in that: The temperature measuring structure of the calender roll surface also includes a rotary connector, which is fixedly installed at one end of the calender roll. The fixed terminal and the rotary terminal of the rotary connector are respectively connected to the temperature measuring element and the temperature measuring output device through wires.

8. The calender roll surface temperature measuring structure according to claim 6, characterized in that: The temperature sensing element is electrically connected to the temperature measurement output device via a wire, and the temperature measurement output device is synchronously rotated and connected to one end of the calendering roll.

9. The temperature measuring structure for the surface of a calendering roll according to claim 1, characterized in that: The temperature sensing element is a thermocouple.

10. The temperature measuring structure for the surface of a calendering roll according to claim 1, characterized in that: The temperature measurement output device is a PLC.

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