JPH028721A - Method and apparatus for measuring temperature of metallic running body - Google Patents

Abstract

PURPOSE:To enable measurement of a temperature of a steel plate running accurately and at a low cost by bringing a temperature measuring roll having a thermocouple into contact with a metallic running body to measure a temperature of the roll while a temperature of an atmosphere near the roll is measured with a second thermocouple. CONSTITUTION:A temperature measuring roll 2 with a thermocouple 4 buried in the surface thereof is brought into contact with a steel plate 1 running to measure a temperature of the roll 2. A conductor 4a of the thermocouple 4 is taken out of a hollow section 2a of the roll 2 and a temperature measured is inputted into an arithmetic device 8 through a rotor 6a and a stator 6b of a slip ring 6. A second thermocouple 5 is provided near the roll 2 to measure a surrounding atmosphere temperature and a temperature measured is inputted into the arithmetic device 8. Based on inputs from both the thermocouples 4 and 5, the arithmetic device 8 performs a computation to calculate a correct temperature of the steel plate 1 according to a contact length.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is a method for once measuring the temperature of a steel plate that is continuously running in a continuous annealing line, a continuous rolling line, etc. of a cold rolling mill. and regarding its equipment.

[Prior art l] Conventionally, the temperature measurement method of a running steel plate in a continuous annealing line of a cold rolling mill, a continuous metal lining, etc., in which the steel plate runs continuously at high speed, has firstly been a radiation thermometer; There is an indirect measurement method using a color thermometer.

Furthermore, a second method involves bringing a thermocouple into contact with a metal traveling body to perform measurement.

Thirdly, as a solution to the problems of the conventional example mentioned above,
A temperature measuring device using a temperature measuring roll as disclosed in Japanese Unexamined Patent Publication No. 58-174823 has been proposed.

[Problems to be Solved by the Invention] However, in the first conventional example described above, the measurement accuracy is poor due to the influence of Q- due to the surface of the steel plate, and the radiant energy decreases below 300°C, making it difficult to measure the temperature of the steel plate. The problem was that it was impossible.

In addition, the second conventional example mentioned above is a contact type, and cannot withstand long-term use due to the effects of frictional heat and wear of the thermocouple.
Further, there was a problem that the steel plate was biased by m.

In addition, the third conventional example mentioned above, JP-A-58-1748,
The temperature measuring roll method of Publication No. 23 is as follows.

It is true that stable measurements can be made without being affected by radiant energy or frictional heat, but when the ambient temperature is atmospheric temperature, the roll surface temperature is low and thermocouples are affected by this, for example. , there was a problem that accuracy was poor when measuring temperatures below 300°C.

Therefore, the present invention was proposed in order to solve the above-mentioned problems, and provides a method and device for measuring the temperature of a metal traveling body, which can accurately and inexpensively measure the temperature of a steel plate traveling at high speed. The purpose is to

[Means for Solving the Problems] The present invention measures the temperature of a hollow roll in which a first thermal lightning pair is embedded in the surface by bringing it into contact with a metal traveling body, and also measures the temperature of the roll in the vicinity of the roll. This method of measuring the temperature of a metal running body is characterized in that the temperature of the atmosphere is measured by a second thermocouple, and the temperature of the metal running body is determined according to the contact length using the measurement result.

Furthermore, the present invention includes a hollow roll, a first thermocouple embedded in the surface of the roll, and a first thermocouple from the first thermocouple.
a second thermocouple that measures the temperature of the atmosphere near the roll and outputs a second signal; and an arithmetic device which calculates the temperature of the metal running body by inputting the second signal manually.

1. Effect 1. As a result of various experiments on measuring steel plate temperatures below 300°C using the 40-rule method, the inventors found that when the contact between the roll circumference and the steel plate is 1/4 or more of the roll circumference, the atmosphere If the temperature of the roll is the same as the steel plate temperature, the temperature of the roll will be directly equal to the temperature of the steel plate, but for example, if a touch roll is used for steady rest and the contact length with the steel plate cannot be secured sufficiently,
In addition, if the atmosphere is also at atmospheric temperature, the following correction can be increased using the ambient temperature to obtain accurate steel jfFR.
I discovered that it is possible to obtain degrees.

That is, from the relationship between the temperature of the steel plate 1, the roll 2, and the atmosphere shown in FIG. Grade: t, (℃) Temperature of roll 2: t, (''C) Temperature of atmosphere: t, ('C) Diameter of roll 2: R (m) Width of steel plate l: w (m) Steel machine 1 Contact length between the steel plate 1 and the roll 2; I2 (m) Contact heat transfer coefficient between the steel plate 1 and the roll 2 atr (kcal/m"-b・℃) Heat transfer coefficient between the roll 2 and the atmosphere: aro (kcal/m") -h・"c) n4 Contact area between 1 and roll 2 W β (second) Contact area between roll 2 and atmosphere: W(πI(-ε) (m"1).

Here, the heat transfer 1Q between the steel plate 1 and the roll 2 is expressed by equation (1),
Heat transfer 1ttQr between the roll 2 and the atmosphere is expressed by equation (2).

Qmr=αgrXWXgX (t * t r )
・= (1) Qro”QroXW(πR−,g)(shi,
-t, )...(2) When the steel plate l and roll 2 are in equilibrium, Q * r =
01°, the temperature of the steel plate l is calculated from the grade t, ("c) of the roll 2 and the temperature t, (°C) of the atmosphere, as shown in equation (3), and the temperature (°C) is obtained.

jm=jr+ ((ZyoX (xR-ff)l
xft, -to)/(airxg)...(3) Here, (a,,X (uR-ffl)/(a,
, xg)=a...-(4), then t,=t,+a (t,-t,)(5).

Usually, a is about 2000 kcal/m2h・℃, ara
is approximately 45 kcal/m"·h·"C.

Therefore, if the diameter R (m) of the temperature measuring roll 2 to be used and the contact length R (m) between the roll 2 and the jllll in contact with it are set in advance, the correction coefficient a is calculated as a=0.0225 from equation (4). ((xR/9) l) −(4
It can be obtained as a).

Therefore, by measuring the temperature tr ("C) of the roll 2 and the temperature of the atmosphere l (i ℃), the temperature of the steel plate 1 can be determined (℃).
) can be measured.

In this way, according to the invention, w4 traveling at high speed
Since the slope temperature is C-corrected using a formula, the temperature can be accurately determined, and the measuring device has a simple configuration, so the temperature can be measured at low cost.

In addition, - numerically, the contact length between the steel plate 1 and the temperature measuring roll 2 (
2) can be sufficiently secured (at least).

(contact of 1/4 or more of the circumference of roll 2) and the surrounding ambient temperature is the same as the z temperature of the steel plate l, measurement of this ambient temperature and correction calculation of the temperature of roll 2) are unnecessary. be.

[Example 1] The present invention will be described based on an example with reference to the drawings.

An example applied to a continuous galvanizing line will be described.

FIG. 1, FIG. 2, and FIG. 3 are explanatory diagrams of the apparatus used in this embodiment.

When measuring the temperature of a continuous galvanizing line or the like, a temperature measuring roll 2 with a first thermocouple 4 embedded in its surface is placed in contact with the n4 l, and the roll 2 performs rotation corresponding to the moving speed of n4 and 1.

A first thermocouple 4 for temperature measurement is embedded in the roll 2 from the inner wall side of the hollow portion 2a toward the surface, and is welded and surface-finished.

Furthermore, the conducting wire 4a of the thermocouple 4 passes through the hollow part 2a of the roll 2 and the hollow part 3b of the roll bearing part 3, and is guided to the outside from the opening 3a.

The roll bearing 3 has a slip ring 6 for signal extraction.
The rotor 6a is attached, and the conducting wire 4a of the thermocouple 4 taken out to the outside is connected at the thermocouple connection part 9 of the slip ring rotor 6a.

As shown in FIGS. 2 and 3, a slip ring rotor 6a is provided to rotate with respect to a slip ring stator 6b, and a ring-shaped conducting wire 6d connected to the conducting wire 4a of the thermocouple 4 is connected to the slip ring stator 6b. 6c, and the first signal is taken out from the slip ring rotor 6a to the outside via the slip ring stator 6b.

Furthermore, the compensation conductor connection l of the slip ring stator 6b
It is input to the arithmetic unit 8 through the auxiliary Iff conductor 117 connected to O, and the l temperature ("c) of the roll 2 is measured.

Also, for the near 1 power of roll 2, the surrounding atmosphere 1 degree to
A second thermocouple 5 is provided to measure ('c) and output a second signal. The calculation is made and displayed on an indicator, etc.

In addition, 1t is used to know the temperature distribution in the width direction of steel plate 1.
-f, the thermocouple 4 of the roll 2 can be attached to the thermocouple χ-74 by shifting the position in the longitudinal direction of the roll, and is not limited to the center.

Plate plated steel plate l with a plate width of 1200 mm at 118 m/min
While running at a line speed of , the temperature measurement roll 2 with a diameter of 120 mm in which a pair of thermocouples 4 was embedded was brought into contact with the slope 1 of 20 mm to measure the temperature of the steel plate 1. It has been determined.

Meanwhile, the ambient temperature near the roll 2 was measured.

At this time, the correction coefficient 21 is calculated using equation (4) as 0
．． 4014, the correction coefficient a was set to 0.40 and this value was set in advance in the arithmetic unit 8.

The temperature measurement result is the temperature of roll 2, (''C) is 83℃, the ambient temperature t+ ('c) is 35℃, and the correction calculation result of the temperature t of steel plate 1, ('C) according to equation (5) is 102.2
It was ℃.

On the other hand, when the line was temporarily stopped and the surface of the plated steel plate 1 was measured with a contact type surface thermometer, the temperature was 102°C.

[Effect of the invention 1] As explained above, the present invention makes it possible to accurately and inexpensively measure the temporary temperature of gold g5 traveling at high speed, and use this measurement result to, for example, make sure that the temperature of a metal plate is constant. By controlling the cooling air of the cooling equipment, significant power savings can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus according to an embodiment of the present invention, FIG. 2 is a sectional view, and FIG. 3 is a partial explanatory diagram. l... Steel plate 2... Roll 4... First thermocouple 5... Second thermocouple 6a... Slip ring rotor 6b... Slip ring stator 8... Calculation Equipment applicant Kawatetsu Techno Research Co., Ltd. Kawa! im
lFi Co., Ltd.

Claims (1)

[Claims] 1. A hollow roll with a first thermocouple embedded in its surface is brought into contact with a metal traveling body to measure the temperature of the roll, and the temperature of the atmosphere near the roll is measured by a second hollow roll. A method for measuring the temperature of a metal running body, characterized in that the temperature of the metal running body is measured using a thermocouple, and the temperature of the metal running body is determined according to the contact length using the measurement result. 2. A hollow roll and a first hole embedded in the surface of the roll.
a thermocouple, a signal transmission means for outputting a first signal from the first thermocouple via a slip ring rotor and a slip ring stator, and a second thermocouple for measuring the temperature of the atmosphere near the roll; 1. A temperature measuring device for a metal running body, comprising: a second thermocouple that outputs a signal; and an arithmetic unit that receives the first and second signals and calculates the temperature of the metal running body.