JPH05312652A - Pressure roller surface temperature measuring device - Google Patents

Abstract

PURPOSE:To obtain a device which can accurately measure the surface temperature of a pressure roller such as a hot pressure roller. CONSTITUTION:This device is provided with a fixed spindle 9. two bearings 71 and 72 which are armored by providing the fixed spindle 9 in longer direction, and a metal sleeve 6 which is supported so that it can rotate freely by two bearings 71 and 72. Furthermore, it is provided with a noncontact type temperature sensor 10 which measures the temperature of the inner surface of the metal sleeve 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface temperature measuring device for rolling rolls such as hot rolling rolls.

[0002]

2. Description of the Related Art In the hot rolling of thin sheets, high flatness and crown accuracy are required for the hot rolled steel sheets as products. By the way, when hot rolling is performed, heat propagated from the material to be rolled causes a so-called heat crown, which is a phenomenon in which the hot rolling roll thermally expands and deforms. If hot rolling is continued with the heat crown still occurring, it becomes impossible to secure the flatness and crown accuracy of the product at predetermined values. Therefore, it is necessary to correct the heat crown amount to a predetermined value, but conventionally, the heat crown amount was corrected by using a bender or other control means during rolling. Since the heat crown amount is a function of the temperature of the hot rolling roll,
In order to correct the amount of heat crown, first, the temperature of the hot rolling roll must be accurately grasped.

However, since the surface temperature of the hot rolling roll has not been easily measured conventionally, the amount of heat crown has been calculated / estimated by using a prediction formula previously obtained from experimental data. In this method, the conditions such as the water temperature of the roll cooling water and the change of the roll surface state were used for the calculation / estimation of the heat crown amount.However, for example, the water temperature of the roll cooling water changes depending on the season. In reality, the condition is affected by various disturbance factors and is not constant, so the heat crown amount calculated by the prediction formula does not match the actual heat crown amount, and accurate estimation is difficult.

In recent years, various techniques for directly measuring the surface temperature of a rolling roll have been proposed. As a technique for directly measuring the surface temperature of rolling rolls, or a technique similar to this technique for measuring the surface temperature of hot-rolled steel sheets, a temperature sensor is embedded inside the temperature-measurement rolls to contact the temperature-measurement rolls and the hot-rolled steel sheet. There are known techniques for making the temperature sensor and a technique for disposing the temperature sensor in proximity to or in contact with the rolling roll.

Technology for Embedding Temperature Measuring Sensor Inside Temperature Measuring Roll JP-A-2-255219 discloses a temperature measuring roll in which a plurality of temperature sensors are embedded in a peripheral portion along a roll axial direction to contact a hot rolled steel sheet. A technique for measuring the temperature of a hot-rolled steel sheet is disclosed in Japanese Utility Model Laid-Open No. 27538/1990 by contacting a hot-rolled steel sheet with a rotating roll provided with a thermo-electromotive force generating portion in contact with a compensating lead wire. Techniques for measuring temperature have been proposed.

Technology for bringing a temperature sensor close to or in contact with a rolling roll Japanese Patent Application Laid-Open No. 58-223027 discloses a thermal radiation type device provided in the vicinity of the rolling roll while ejecting a gas onto the surface of the rolling roll to remove cooling water. A technique for measuring the temperature of a rolling roll with a temperature sensor is disclosed in Japanese Utility Model Laid-Open No. 62-195729, in which the temperature of a rolling roll is measured by disposing temperature sensors (fiberscopes) at required intervals in the axial direction of the roll. Each technology has been proposed.

FIG. 2 is an explanatory view showing an example of a roll temperature measuring device proposed by Japanese Utility Model Publication No. 62-195729. 2 (a) is an explanatory view of a surface orthogonal to the axial direction of the rolling roll 1, and FIG. 2 (b) is a side view. That is, a plurality of fiberscopes 5 are installed close to the rolling roll 1 in the axial direction of the rolling roll, and the signal detected by the fiberscope 5 is output to a signal processing circuit (not shown) to measure the surface temperature of the rolling roll 1. To do.

[0008]

Since the technique of embedding a temperature sensor inside a temperature measuring roll to bring the temperature measuring roll into contact with the hot rolled steel sheet is a technique for measuring the temperature of the hot rolled steel sheet, the rolling roll is left as it is. Although it cannot be used to measure the temperature of the rolling roll, it is considered that the temperature of the rolling roll can be easily measured by using this temperature measuring roll as a rolling roll, that is, by embedding a temperature sensor inside the rolling roll. . However, this reduces the mechanical strength of the portion where the temperature sensor is embedded, and cannot be used as a rolling roll.

Further, in this technique, it is conceivable to simply change the object of measurement from a hot rolled steel sheet to a rolling roll.
FIG. 3 is an explanatory diagram showing an example of a configuration in which the plate temperature measuring device proposed by Japanese Patent Laid-Open No. 2-255219 is diverted as a rolling roll surface temperature measuring device. 3 (a) is a sectional view of a plane orthogonal to the roll axis direction, FIG. 3 (b) is a sectional view taken along the line BB of FIG. 3 (a), and FIG. 3 (c) is a temperature sensor 3
3 is a graph showing the output of That is, the temperature measuring roll 2 in which the temperature sensor 3 is embedded is arranged so as to be in contact with the rolling roll 1, and the signal of the waveform shown in FIG. 3 (c) detected by the temperature sensor 3 is processed through the slip ring 4. Output to a circuit (not shown). However, the temperature sensor 3 (generally a thermocouple) also rotates with the rotation of the rolling roll 1 that is the measurement target. Therefore, at the moment when the temperature sensor 3 is in contact with the rolling roll 1, the measurement can be performed without being affected by the disturbance, but until the temperature sensor 3 comes into contact with the rolling roll 1 and the next contact, The signal is interrupted (see Fig. 3 (c)). Further, since it is necessary to take out the signal through the slip ring 4, there is a problem in terms of maintainability. Therefore, it is not easy to always maintain the measurement accuracy in a normal state, and practical application is difficult. It is possible to use a radiation thermometer as the temperature sensor 3, but in this case, maintenance of the optical system at the tip portion was also a problem.

In the technique of arranging the fiberscope 5 as a temperature sensor in close proximity to the surface of the rolling roll 1 as illustrated in FIG. 2, the rolling roll 1 to be measured and the fiberscope 5 (generally a radiation thermometer) However, the fiberscope 5 may remain fixed, but since a gap is formed between the fiberscope 5 and the surface of the rolling roll 1, disturbance due to roll cooling water or the like is likely to occur, and accurate measurement is difficult. An object of the present invention is to provide a measuring device capable of accurately measuring the surface temperature of a rolling roll such as a hot rolling roll.

[0011]

Generally, it is necessary to measure the surface temperature of a roll not on a backup roll but on a work roll. The present inventor pays attention to the fact that when the temperature sensor is directly embedded in the rolling roll as described above, the mechanical strength of the roll surface is lowered and the rolling itself cannot be performed, and a technique of bringing the temperature sensor into proximity with or in contact with the rolling roll Based on the basic idea, we conducted further studies.

On the other hand, for the purpose of investigating the heat crown of the rolling roll during rolling, the average of the surface of the rolling roll over time is measured rather than continuously measuring the temperature change while the rolling roll makes one revolution. It has been found that it is important to measure the temperature, and the responsiveness of the temperature sensor need not be so high. The present inventor has completed the present invention as a result of various studies on a rolling roll surface temperature measuring device for the purpose of measuring the average temperature of the surface of the rolling roll based on the above findings.

Here, the gist of the present invention is that a fixed shaft, which is generally cylindrical, and at least two or more bearings that are mounted on the fixed shaft at intervals in the longitudinal direction, and at least two or more. A rolling roll surface temperature measuring device comprising a metal sleeve rotatably supported by these bearings, further comprising an inner surface of the metal sleeve provided on a fixed shaft between the at least two bearings. It is a rolling roll surface temperature measuring device characterized by comprising a non-contact type temperature sensor for measuring the temperature.

[0014]

The operation of the present invention will be described in detail below. Briefly described, the present invention provides a non-contact type temperature sensor at least at one location of a generally cylindrical fixed shaft, and at least two of the fixed shafts are provided at intervals in the longitudinal direction so as to sandwich the temperature sensor. The above bearings are mounted on a fixed shaft, and a metal sleeve is further mounted on these bearings. That is, the temperature sensor is fixed so that the inner surface of the metal sleeve can be measured, and when the metal sleeve comes into contact with and rotates with the rolling roll that is the temperature-measuring material, the temperature sensor remains fixed and constantly rolls. It is arranged so that the temperature of the inner surface of the metal sleeve at the point of contact with the roll can be measured. The non-contact type temperature sensor is not limited to a particular one, and a known one can be applied. Further, the installation method of the fixed shaft and the like are not limited in the present invention.

Therefore, according to the present invention, since it is not necessary to rotate the temperature sensor and the measurement signal output system, it is not necessary to use a slip ring or the like. Further, since a non-contact type temperature sensor is used as the temperature measuring element, there is no need to worry about damage to the temperature sensor due to measurement. further,
Since the temperature measuring part of the temperature sensor is the inner surface of the metal sleeve and the vicinity of the temperature measuring part is the part surrounded by the metal sleeve,
There is no disturbance such as roll cooling water. Therefore, according to the present invention, the surface temperature of the rolling roll can be continuously measured with high accuracy for a long time.

In the rolling roll surface temperature measuring device having such a structure, the responsiveness is worse than in the case where the surface temperature of the rolling roll is directly measured, but the purpose of measuring the temperature of the roll is as described above. As described above, since the average surface temperature of the rolling roll is obtained in order to calculate the heat crown amount of the rolling roll during rolling, there is no problem at all. On the contrary, there is an advantage that the numerical processing of the measurement data is easily simplified due to the less disturbance during temperature measurement. Further, the present invention will be described with reference to examples, which are illustrative of the present invention and are not intended to limit the present invention.

[0017]

EXAMPLE FIG. 1 is an explanatory view showing the structure of an example of a rolling roll surface temperature measuring device according to the present invention. FIG. 1 (a) is a sectional view of a plane orthogonal to the roll axis direction. (b) is a sectional view taken along line AA of FIG.

The rolling roll surface temperature measuring device according to the present invention comprises a cylindrical fixed shaft 9, two bearings 71 and 72 which are mounted on the fixed shaft 9 at intervals in the longitudinal direction, and bearings 71 and 72. A non-contact temperature sensor 10 for measuring the temperature of the inner surface of the metal sleeve 6 is provided on the fixed shaft 9 between the two bearings 71 and 72. Has been. The rolling roll surface temperature measuring device according to the present invention is in contact with the rolling roll 1. In the figure, reference numeral 8 indicates a bearing inner ring.

That is, the metal sleeve 6 that receives heat from the rolling roll 1 rotates as the rolling roll 1 rotates. The metal sleeve 6 is rotatably attached to the bearing inner ring 8 and the fixed shaft 9 via two bearings 71 and 72 that are provided at intervals in the longitudinal direction and are exteriorly mounted. Two bearings
A non-contact type temperature sensor 10 is attached to the fixed shaft 9 between 71 and 72. Then, the temperature of the inner surface of the metal sleeve 6 at the point of contact with the rolling roll 1 from between the two bearings 71 and 72 is measured.

The rolling roll surface temperature measuring device according to the present invention having such a constitution was incorporated into a test device consisting of a model rolling mill of 1/3 scale of an actual rolling mill, and a temperature measuring test of the rolling roll was carried out. An outline of the device is shown in FIG. As shown in the figure, it is composed of a pair of vertically symmetrical rolling rolls.
As the rolling roll 13 on the upper side of the multi-stage rolling mill, a dummy rolling roll having a hollow inside and having a ribbon heater and a thermometer incorporated therein to enable temperature control was used.

In order to measure the surface temperature of the upper rolling roll 13, a rolling roll surface temperature measuring device according to the present invention and, as a comparative example, a non-contact type thermometer shown in FIG. Using the roll surface temperature measuring device (Comparative Example 1) and the rolling roll surface temperature measuring device (Comparative Example 2) incorporating the thermocouple shown in FIG.
The surface temperature of each was measured and the result was compared.
Further, the measurement was also performed while cooling water was applied to the work rolls, and the influence of disturbance on the measurement accuracy of each rolling roll surface temperature measuring device was also investigated. The results are summarized in the graphs of FIGS. 5 and 6. Figure 5 shows the case without water cooling,
FIG. 6 shows the case where water cooling is performed.

Comparing each measuring device, a rolling roll surface temperature measuring device (Comparative Example 1) in which a non-contact type thermometer was installed close to the roll surface (Comparative Example 1) had good responsiveness and continuously measured the surface temperature of the rolling roll. It can be measured and its structure is simple. However, if the measurement is performed while cooling water is applied to the rolling roll, accurate temperature measurement cannot be performed due to the influence of water adhering to the roll surface. Further, according to the investigation after the measurement, the optical system provided at the tip portion of the temperature sensor was contaminated, and there was a problem in durability and maintainability in long-time measurement.

Further, the rolling roll surface temperature measuring device incorporating the thermocouple (Comparative Example 2) has the best responsiveness, but the measured data is noisy and the rolling roll and the thermocouple sensor are in contact with each other. It is difficult to handle and process the measurement data because it can be measured only at the moment. The rolling roll surface temperature measuring device according to the present invention can continuously measure and almost no noise was observed in the measured data. Moreover, the structure is simple, and the measurement is not affected by water even when it is applied with cooling water. Further, according to the survey after the measurement, the maintainability is superior to that of the comparative example because the sensor is a fixed type and has a closed structure that is not directly exposed to the external environment. The responsivity was not as high as that of Comparative Example 2 but was not a particular problem, and was sufficient for obtaining the average temperature of the rolling rolls.

[0024]

As described in detail above, according to the present invention,
The surface temperature of the rolling rolls can be measured easily and reliably over a long period of time, and the heat crown calculated based on this measurement data enables highly accurate crown control. A great effect is brought about in the improvement of accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory view of the structure of an example of a rolling roll surface temperature measuring device according to the present invention, FIG. 1 (a) is a cross-sectional view of a plane orthogonal to the roll axial direction, and FIG. 1 (b) is the same. A- in Figure (a)
FIG.

FIG. 2 is an explanatory diagram showing an example of a roll temperature measuring device proposed by Japanese Utility Model Laid-Open No. Sho 62-195729. 2 (a) is an explanatory view of a surface orthogonal to the axial direction of the rolling roll 1, and FIG. 2 (b) is a side view.

FIG. 3 is an explanatory view showing an example of a configuration in which the plate temperature measuring device proposed by Japanese Patent Laid-Open No. 2-255219 is diverted as a rolling roll surface temperature measuring device, and FIG. 3 (b) is a cross-sectional view of a plane perpendicular to the plane of FIG. 3 (b), and FIG. 3 (c) is a temperature sensor 3 of FIG.
3 is a graph showing the output of

FIG. 4 is an explanatory diagram showing an outline of an apparatus used when a temperature measurement test of a rolling roll is performed.

FIG. 5 is a graph showing the results of investigating the influence of disturbance on the measurement accuracy of each rolling roll surface temperature measuring device in the examples, showing the results when the water cooling of the rolling rolls is not performed at the time of measurement.

FIG. 6 is a graph showing the results of investigating the influence of disturbance on the measurement accuracy of each rolling roll surface temperature measuring device in the example, showing the results when the rolling rolls were water-cooled during measurement.

[Explanation of symbols]

1: Rolling roll 2: Roll surface temperature measuring device 3: Temperature sensor 4: Slip ring 5: Radiation thermometer 6: Metal sleeve 71, 72: Bearing 8: Bearing inner ring 9: Fixed shaft 10: Temperature sensor 11: Water cooling nozzle 12 : Kaika roll surface temperature measuring device according to the present invention 13: Upper rolling roll

Claims (1)

[Claims] 1. A fixed shaft, at least two bearings which are provided on the fixed shaft at intervals in the longitudinal direction and are externally mounted, and a metal sleeve which is rotatably supported by at least two bearings. A rolling roll surface temperature measuring device, further comprising a non-contact type temperature sensor for measuring the temperature of the inner surface of the metal sleeve, which is provided on the fixed shaft between at least two bearings. Characteristic rolling roll surface temperature measuring device.