JPH0772021A - Moving object and thermometer for rotor - Google Patents

Abstract

PURPOSE:To make it possible to accurately measure the surface temperature of a subject moving and turning by winding metals of different kinds for a thermocouple on a circumferential surface of a pair of conductive rotary rollers arranged jointly through an insulating body to detect an electromotive force generated at a temperature measuring contact point of the thermocouple. CONSTITUTION:A pair of rotary rollers 1a and 1b made of a carbon solid are clamped by electrically insulating bolts and chromel and alumel as combined metals forming K thermocouples 2a and 2b are wound on the circumferential surface thereof. The thermocouples 2a and 2b may be selected properly depending on a temperature measuring range of a subject. The rollers 1a and 1b are supported by holding frames 5a and 5b through a slide bearings 4a and 4b formed integrally and compensation conductors 6a and 6b are connected to the holding frames 5a and 5b respectively. Electromotive force generated between the subject and the thermocouples 2a and 2b is inputted into an automatic balance measuring device through the compensation conductors 6a and 6b from the rollers 1a and 1b, the bearings 4a and 4b and the holding frames 5a and 5b to correct and indicated with a temperature indicator point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermometer for continuously measuring the surface of a high temperature object to be measured having conductivity such as moving or rotating metal.

[0002]

2. Description of the Related Art In the process of moving or rotating high-temperature steel products during the production process, as a means for measuring the surface temperature of these products, generally a non-contact type radiation thermometer and a contact type are used. A certain thermoelectric thermometer is often used.

The radiation thermometer is constructed by converging the radiant heat of the object to be measured with an optical lens, and installing a thermocouple or a photoelectric tube, which is a temperature detecting section, at the converging part. Since there are no parts that come into direct contact, it is also used to measure, for example, moving objects and furnace temperatures.

Further, as a contact type thermoelectric thermometer,
For example, in Japanese Utility Model Laid-Open No. 27527/1990, a rotary roller made of a metal material that is in rolling contact with a temperature-measuring body is mounted on a shaft, and a thermoelectromotive force generating section made of a thermocouple member is provided on the rotary roller. A surface thermometer is disclosed which measures a temperature by bringing a compensating lead wire into contact with the electromotive force generating portion.

[0005]

By the way, in the former quantitative temperature measurement by the radiation thermometer, it is necessary to accurately grasp the emissivity of the object to be measured, and to prevent contamination of the optical system. However, when measuring the temperature of the slab produced by the continuous casting method with a radiation thermometer, the oxidation state of the slab surface is not constant, and it is very difficult to grasp its emissivity, and it is also necessary to measure it. The atmosphere is in a bad environment where water vapor, oxide dust, etc. exist, and it is difficult to measure continuously and accurately.

Further, in the latter structure of the surface thermometer using the contact type thermocouple, there is a deviation between the position for receiving the actual surface temperature of the object to be measured on the rotating roller and the position for providing the thermoelectromotive force generating portion. It also occurs, and the heat capacity of the rotating roller has a great influence, and it is difficult to accurately grasp and measure the surface temperature of the temperature-measured body by the rotating roller.

In view of the above-mentioned problems, the present invention provides a surface of a high temperature object to be measured having conductivity such as a moving or rotating metal,
Provide a thermometer that continuously and accurately measures.

[0008]

According to the present invention, a dissimilar metal for a thermocouple is wound around each of the peripheral surfaces of a pair of electrically conductive rotary rollers that are provided side by side with an insulator interposed therebetween, and is provided on a holding frame of the rotary rollers. A thermometer for a moving body and a rotating body, each of which is connected with a compensating lead wire for a thermocouple.

Further, in the above-described moving body and rotating body thermometer, the insulator is a ceramic material, and the rotating roller is a carbon solid material impregnated with an oxidation resistant alkoxide.

In each of the above-mentioned moving body and rotating body thermometers, a thermocouple compensating lead wire is connected to the shaft portion of the rotating roller via a brush.

[0011]

According to the present invention, two kinds of dissimilar metals for thermocouples are attached to the peripheral surfaces of a pair of electrically conductive rotary rollers provided side by side via insulators, respectively, and the dissimilar metals are moved or rotated. Rotate by pressing against the object to be measured and rotating it 2
The electromotive force generated at the temperature measuring contact between the different kinds of metals and the object to be measured is directly detected from at least one of the rotating body, the bearing portion and the holding frame.

As described above, according to the present invention, the electromotive force generated at the temperature measuring contact of the thermocouple in direct contact with the object to be measured is detected, so that the surface temperature of the object to be measured can be accurately measured. Continuous measurement is possible, and by rotating different metals, there is almost no resistance to the object to be measured, the surface of the object to be measured is not damaged, and the thermocouple is less damaged and has a long life.

For a high temperature object to be measured, the rotary roller is made of carbon solid material having excellent heat resistance, conductivity and self-lubricating property, and the sliding bearing is made of carbon solid material or ceramics. There is almost no change in contact resistance related to the detection accuracy of thermoelectromotive force, and seizure of the bearing under high temperature conditions can be prevented.

In the thermometer according to the present invention, 60
In the case of measurement at a high temperature of 0 ° C. or higher, against the problem that carbon is oxidized when used for a long time, oxidation resistance can be imparted by coating carbon particles by impregnating and firing with alkoxide particles. Can be used stably for a long time.

Further, in order to avoid the influence of the temperature distribution and the heat capacity of the heat contacts of the thermocouple, in the present invention, a ceramic material is inserted between the pair of rotating rollers as an insulator having heat insulation property, and two kinds of different metals are used. There was electrical insulation between them.

As described above, the dissimilar metal for the thermocouple wound around the peripheral surface of the rotating roller is directly pressed against the object to be measured, and the surface temperature is measured while rotating the rotating roller. The surface temperature of the object can be measured accurately and continuously, and by rotating the dissimilar metal, the surface of the object to be measured is not damaged, the thermocouple is less damaged, and the life is extended.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall front view of a thermometer for a moving body and a rotating body, and FIG. 2 is a front view (a) and a side view (b) showing details of essential parts.

This thermometer comprises an insulator 3 made of a ceramic material.
A pair of solid carbon rotary rollers 1a and 1b are fastened together by bolts of an electrically insulating material, and K are attached to the peripheral surfaces of the rotary rollers 1a and 1b.
Chromel as a dissimilar metal forming the thermocouples 2a, 2b,
Wrap the alumel. Further, the entire rotating roller is supported by stainless steel holding frames 5a and 5b via slide bearings 4a and 4b formed integrally with the roller portion.

The compensating lead wires 6a and 6b for the thermocouple are connected to the holding frames 5a and 5b, respectively. The compensating conductors 6a and 6b are also used for the leaf springs 7a and 7b and the brush 8.
You may make it connect to the terminal which slides on the shaft part of the rotating rollers 1a and 1b via a and 8b.

As the thermocouples 2a and 2b, in addition to the above K thermocouple, B (platinum / rhodium 30% -platinum / rhodium 6%), R (platinum / rhodium 13% -platinum), S (platinum / rhodium) Rhodium 10% -platinum) and E (chromel-constantan) thermocouples can be used, but may be appropriately selected depending on the measurement temperature range of the object to be measured. Further, as the insulator 3 made of a ceramic material, BN (boron-nitrite) is suitable in terms of heat resistance and the like.

On the extension of the holding frames 5a and 5b, a pair of intermediate protective tubes 9a and 9b is connected, and subsequently an upper protective tube 10 is connected.
The intermediate protection tube has springs 1a, 1
A coil spring 11 that applies a stable pressing force to b is attached. The intermediate protection tubes 9a and 9b are fastened to each other via insulators 12a and 12b, respectively. The compensating conductors 6a and 6b are connected to a temperature indicator 13 provided outside through the inside of the protective tubes 9a, 9b and 10. Reference numeral 16 is a heat insulating cover.

Further, in the temperature measurement above 600 ° C.,
As a measure against oxidation of the rotating rollers 1a and 1b and the thermocouples 2a and 2b, it is preferable to measure in a non-oxidizing atmosphere such as nitrogen and argon gas.

FIG. 3 is a drawing showing an example of connection of the temperature compensation circuits of the thermocouples 2a and 2b. 14 is an electronic automatic balance measuring instrument that is used as a standard for industrial measurement. In order to compensate the reference junction temperature θ ₀ to 0 ° C, the temperature change of the copper wire or semiconductor embedded in the measuring instrument input terminal Resistance change R
(Θ ₀ ) is used.

Here, the object to be measured 15 and the thermocouples 2a, 2
The thermoelectromotive force generated between the rotating rollers 1a and 1b
b, the plain bearings 4a and 4b, the holding frames 5a and 5b, and the compensating lead wires 6a and 6b, which are input to the automatic balance measuring instrument 14,
It is calibrated here and is instructed by the temperature indicator 13.

In the following, as a working example, the measured temperature was compared and examined between 600 to 1200 ° C. in a nitrogen atmosphere in the case of using the radiation thermometer and the conventional thermocouple thermometer of the present invention. The measurement results are shown in Table 1.

[0024]

[Table 1]

As can be seen from the above examples, the thermometer using the conventional thermocouple is slightly lower than the reference value measured by the radiation thermometer, but the measured value is the reference value in the present invention. It is shown that the value was approached and the measurement was performed with higher accuracy.

[0026]

As described above, the thermocouple thermometer of the present invention detects the electromotive force generated at the temperature measuring contact which is in direct contact with the object to be measured, as compared with the conventional thermocouple thermometer. ,
It is possible to measure with higher accuracy and continuously, and by supporting the rotating roll with a carbon solid sliding bearing,
The rotation is smooth and seizure of the shaft portion of the rotating roll is prevented. Further, the surface of the temperature-measured object is not damaged, the thermocouple is less damaged, the service life is increased, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is an overall front view of a thermometer for a moving body and a rotating body.

FIG. 2 is a front view (a) and a side view (b) showing details of a main part of a thermometer.

FIG. 3 is a diagram showing a connection example of a thermocouple temperature compensation circuit.

[Explanation of symbols]

 1a, 1b Rotating roller 2a, 2b Thermocouple 3 Insulator 4a, 4b Sliding bearing 5a, 5b Holding frame 6a, 6b Compensation lead wire 7a, 7b Leaf spring 8a, 8b Brush 9a, 9b Intermediate protective tube 10 Upper protective tube 11 Coil spring 12a , 12b Insulator 13 Temperature indicator 14 Electronic automatic equilibrium measuring instrument 15 Object to be measured 16 Insulation cover

Claims (3)

[Claims] 1. A dissimilar metal for a thermocouple is wound around each of the peripheral surfaces of a pair of electrically conductive rotary rollers provided side by side via an insulator, and a thermocouple compensating lead wire is connected to a holding frame of the rotary roller. A thermometer for a moving body and a rotating body, which is characterized in that 2. A thermometer for a moving body and a rotating body according to claim 1, wherein the insulator is a ceramic material, and the rotating roller is a carbon solid material impregnated with an oxidation resistant alkoxide. 3. The thermometer for a moving body and a rotating body according to claim 1, wherein the compensating lead wire for the thermocouple is connected to the shaft portion of the rotating roller via a brush.