JPH0712650A - Radiation thermometer device in continuously measuring device for temperature of molten metal - Google Patents

Abstract

PURPOSE:To improve responsibility, eliminate the production of gas in a radiation thermometer observation channel and make exact measurement by unitizing an endurance component of a remote measurement device and providing a cooling channel and a cooling clamber therein. CONSTITUTION:A radiation thermometer device comprises an inner pipe 7 composed of a remote measurement device 6 and an alumina porcelaneous pipe and an outer pipe 8 made of alumina graphite. In a case where the inner and outer pipes 7, 8 are consumed, the inner pipe 7 and/or the outer pipe 8 can be easily exchanged for the device 6 and the device 6 can be repeatedly used as an endurance component. A refrigerant supply opening 32 such cooling air is provided in an amplificaytion box 24 and supplied refrigerant passes a refrigerant flow passage 33 formed in a heat resistant flexible tube 12 through the inside of the amplification box 24. Thereby heat resistant fiber 11 and an optical system setting part 9 can be always surely cooled and normal temperature measurement is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation thermometer device in a device for continuously measuring the temperature of molten metal, particularly in a continuous casting facility such as a tundish.

[0002]

2. Description of the Related Art Conventionally, for example, as disclosed in JP-A-4-2709 and JP-A-4-166730, a radiation thermometer device and a temperature for correcting the temperature measured by the radiation thermometer device are used. A molten metal continuous temperature measuring device including a consumable thermocouple is known, and the radiation thermometer device includes an optical tube provided with a bottomed cylindrical protective tube and a detection head and facing the protective tube. It is known to include a system installation part and a fiber for transmitting a signal detected by the detection head to a signal processing means at a remote place.

[0003]

In the radiation thermometer device used for the known continuous temperature measuring device for molten metal, the protective tube formed of Zr-based ceramics, for example, ZrO ₂ -Mo, is occasionally found. Such a protection tube has a problem that, at high temperature, Mo metal vapor generated inside the protection tube disturbs the radiation thermometer visual path to cause a measurement error.

On the other hand, it is known that the protective tube is made of a boride-based ceramic, for example, ZrB ₂ , but the boride-based ceramic has a low thermal shock resistance, and it is heated in an electric furnace or the like in advance before being immersed in a molten metal. There is a problem that it will crack if it is not preheated to a degree C or higher and used. Moreover, since the boride-based ceramics has a low emissivity, the cavity emissivity in the protection tube will not be constant at a low value unless the dip of the protection tube is deeper than a certain value, causing an error in the temperature measurement value. There is.

Further, in the radiation thermometer device in which the optical system installation section is provided near the tail end of the protective tube together with the signal processing means,
If the periphery of the signal processing means is not cooled to 80 ° C. or lower, the converter and the amplifier do not operate normally, so that there is a problem that a complicated structure for such cooling means must be adopted.

Further, the conventional radiation thermometer device has a problem that, when the protective tube is consumed, not only the protective tube but also the surrounding components must be replaced at the same time.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a radiation thermometer device for a continuous molten metal temperature measuring device which solves the above problems. The first means is a consumable thermoelectric device. A radiation thermometer device in a molten metal continuous temperature measuring device equipped with a pair of temperature correction means, comprising a remote measuring unit, an inner tube made of an alumina porcelain tube, and an outer tube made of alumina graphite. The measuring unit includes an optical system installation section having a detection head inside and an inner tube mounting section provided at a tip, a housing surrounding the optical system installation section, and a signal processing means for remotely detecting a signal detected by the detection head. A heat-resistant type fiber for transmitting heat to the heat-resistant fiber and a heat-resistant flexible tube covering the heat-resistant type fiber, and a refrigerant flow path is formed in the unit. Together, the inside of the housing constitutes a cooling chamber communicated with the refrigerant flow path, the inner pipe is detachably attached to the inner pipe attachment portion of the optical system installation portion of the telemetry unit, The outer tube covers the inner tube and is detachably attached to a housing of the telemetry unit.

According to the second aspect of the present invention, the housing constitutes an inner / outer double wall, and a cooling chamber formed inside the inner wall is connected to an annular cooling passage formed between the inner and outer walls. The point is that the refrigerant outlet from the annular cooling passage is provided on the outer wall.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIG. 1, a device for continuously measuring the temperature of the molten metal 2 in a continuous casting facility such as a tundish 1 is composed of a radiation thermometer device 3 and the radiation thermometer device 3. The radiation thermometer device 3 and the consumable thermocouple 4 are provided with a consumable thermocouple 4 for correcting the measured temperature.
Transmits the detected signal to the signal processing means 5 at a remote place.

In general, the radiation thermometer device 3 is strong against a disturbance such as noise, but is easily affected by the fluctuation of the emissivity of the object to be measured. On the other hand, the thermocouple 4 is simple and easy to handle, but is exposed to high temperatures, and therefore is consumed early.
Therefore, while continuously measuring the temperature by the radiation thermometer device 3, the spot measurement value by the consumable thermocouple 4 is taken into the signal processing means 5, and automatic calibration is performed there.

As shown in FIG. 2, the radiation thermometer device 3 is
Telemetry unit 6 and inner tube 7 made of alumina porcelain tube
And an outer tube 8 made of alumina graphite.

The telemetry unit 6 includes an optical system installation section 9 and a housing 10 surrounding the optical system installation section 9.
A unit including the heat resistant fiber 11 and the heat resistant flexible tube 12 covering the heat resistant fiber 11 is configured.

As shown in FIG. 3, the optical system installation section 9 is provided.
Has a detection head 13 provided therein and an inner tube mounting portion 14 provided at the tip, and a heat resistant fiber 11 for transmitting a signal detected by the detection head 13 to the signal processing means 5 is extended from the tail end. I'm giving it away.

The housing 10 constitutes cylindrical inner and outer double walls 15 and 16 surrounding the optical system installation portion 9,
Both ends of the inner and outer double walls 15, 16 are airtightly connected by a ring body 17 made of ceramics, and both tail ends are airtightly connected by an annular metal fitting 18. An elbow pipe 21 is connected to the annular metal member 18 via screw joints 19 and 20, and a screw ring 22 is attached to the elbow pipe 21.
The heat resistant flexible tube 12 is connected via. The extended end of the heat resistant flexible tube 12 is connected to an amplifier box 24 of the signal processing means 5 via a screw ring 23, as shown in FIG.

The inner tube 7 made of the alumina porcelain tube is detachably fixed by inserting the mounting base 25 into the inner tube mounting portion 14 and fixing means 26 such as a screw. At this time, as shown in FIG. 3, the ring body 17 constitutes an insertion / removal hole 27 through which the mounting base 25 is inserted, and the tip of the inner pipe mounting portion 14 faces the insertion / removal hole 27 and the ring body 17 is inserted into the ring body. It is fitted to 17. The inner surface of the inner tube 7 is preferably blackened at least in the vicinity of the tip.

Outer tube 8 made of the above alumina graphite
Is formed in a bottomed cylindrical shape that covers the inner tube 7 leaving a gap S at the tip of the inner tube 7, and a sleeve 28 is externally secured to the tail end. The sleeve 28 constitutes a metal tubular body that is removably inserted in the housing 10.
It has an attachment / detachment fixing means 29 made of a butterfly bolt or the like. Therefore, when the sleeve 28 is externally inserted into the housing 10, the tail end of the sleeve 28 is brought into contact with the stopper 30 of the housing outer wall 16, and the attachment / detachment fixing means 29 is tightened.
The outer tube 8 is attached and fixed to the telemetry unit 6. A flange 31 is fixed near the tail end of the sleeve 28. Further, the outer tube 8 has a thin portion 8a in a region near the tip end thereof, and has good responsiveness.

In the above structure, the amplifier box 2
A cooling medium supply port 32 for cooling air or the like is provided at 4, and the supplied cooling medium flows through the inside of the amplifier box 24 and the cooling medium passage 33 formed in the heat resistant flexible tube 12. Further, as shown in FIG. 3, the refrigerant flowing through the refrigerant flow path 33 is sent to the cooling chamber 34 formed inside the housing inner wall 15, and the optical system installation portion 9 is there.
To cool. The cooling chamber 34 is communicated with an annular cooling passage 36 formed between the inner and outer walls 15 and 16 through a communication hole 35 formed at the tip of the inner wall 15, so that the refrigerant flows from the cooling chamber 34 into an annular shape. It flows into the cooling passage 36, and the outer wall 16
It is discharged from the refrigerant discharge port 37 opened near the tail end of the.

According to the configuration of the above embodiment, since the signal processing means 5 is remotely installed and is not easily affected by heat, the ambient temperature of the optical system installation section 9 may be maintained at 350 ° C. or lower. During continuous temperature measurement, a coolant such as cooling air supplied from the coolant supply port 32 is circulated through the coolant passage 33, the cooling chamber 34, and the annular cooling passage 36, so that the heat resistant fiber 11 and the optical system are installed. It is possible to cool the part 9 reliably at all times, ensuring a normal temperature measurement.

Further, since the outer tube 8 is an alumina graphite tube having a high emissivity, the cavity emissivity is high, and therefore,
The immersion depth in the molten metal may be small, and as a result, the length of the outer tube 8 can be designed to be short, and the cost of the entire apparatus can be reduced. By the way, in the case of an alumina graphite tube, there is a possibility that CO gas or CO ₂ gas that may react with the air in the tube to disturb the radiation thermometer visual path may be generated. By constructing the double pipe structure with the inner pipe 7 made of a pipe, gas is not generated in the radiation thermometer visual path, and normal temperature measurement is guaranteed.

Further, when the inner pipe 7 and the outer pipe 8 are consumed,
Inner tube 7 and / or outer tube 8 for remote temperature measurement unit 6
Only the remote temperature measuring unit 6 can be easily replaced.
Is economical because it can be used repeatedly as a durable part.

[0022]

According to the present invention described in claim 1, while the durable parts are unitized by the telemetry unit 6,
The inner tube 7 and the outer tube 8, which are consumable parts, are connected to the telemetry unit 6
Since it is detachably attached to the remote measuring unit 6, it is economical because the minimum necessary consumable parts may be replaced while the remote measuring unit 6 is repeatedly used.

Further, as a result of constructing the refrigerant passage 33 and the cooling chamber 34 inside the unitized remote measuring unit 6 as described above, a special cooling mechanism is not required outside, and it can be provided at a low cost. As a result of the inner-outer double-tube structure in which the outer tube 8 is made of an alumina graphite tube having a high emissivity and the inner tube 7 is made of an alumina porcelain tube that does not generate a reaction gas, the entire temperature is ensured while ensuring normal temperature measurement. Since the length can be shortened, there is an advantage in that it can be provided at low cost in this respect as well.

According to the invention as defined in claim 2, the inner and outer double walls 1 of the housing 10 in the telemetry unit 6 are
Since the annular cooling passage 36 is constituted by 5 and 16, not only the heat insulation between the optical system installation section 9 and the high temperature outside air is excellent, but also the cooling effect of the optical system installation section 9 is excellent, and the desired normal condition is achieved. The effect is that you can promise accurate temperature measurement.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view of a main part of the same embodiment.

FIG. 4 is an exploded side view of the embodiment.

[Explanation of symbols]

 3 Radiation thermometer device 4 Consumable thermocouple 5 Signal processing means 6 Remote measuring unit 7 Inner tube 8 Outer tube 8a Thin section 9 Optical system installation section 10 Housing 11 Heat resistant fiber 12 Heat resistant flexible tube 13 Detection head 14 Inner tube mounting section 15 Inner Wall 16 Outer Wall 24 Amplifier Box 25 Mounting Base 26 Mounting Means 28 Sleeve 29 Detaching Fixing Means 32 Refrigerant Supply Port 33 Refrigerant Flow Path 34 Cooling Chamber 36 Annular Cooling Path 37 Refrigerant Discharge Port

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuhei Sakaguchi Ikuhei Sakaguchi 1-7-10 Nishihonmachi, Nishi-ku, Osaka-shi, Osaka Within Kawaso Electric Industry Co., Ltd. (72) Kenichi Gomei Nishihonmachi, Nishi-ku, Osaka-shi, Osaka 1-7-10 Kawaso Electric Co., Ltd. (72) Inventor Shigeru Inoue 1-7-10 Nishihonmachi Nishi-ku, Osaka-shi, Osaka Prefecture Kawaso Electric Co., Ltd.

Claims (2)

[Claims] 1. A radiation thermometer device in a molten metal continuous temperature measuring device having a temperature compensating means by a consumable thermocouple, comprising a remote measuring unit, an inner tube made of alumina porcelain tube, and alumina graphite. An outer tube is provided, and the telemetry unit has an optical system installation section in which a detection head is internally provided and an inner tube attachment section is provided at a tip, a housing surrounding the optical system installation section, and the detection head detects A unit comprising a heat-resistant fiber for transmitting a signal to a signal processing means at a remote place and a heat-resistant flexible tube for covering the heat-resistant fiber is formed, and a refrigerant flow path is formed in the tube and at the same time in the housing. And a cooling chamber communicating with the refrigerant flow path, wherein the inner pipe is attached to and detached from an inner pipe mounting portion of an optical system installation portion of the telemetry unit. Become attached to, the outer tube is configured to cover the inner tube, a radiation thermometer device in the molten metal continuous temperature measuring apparatus, characterized by comprising detachably mounted to the housing in the telemetry unit. 2. The housing constitutes a double wall inside and outside,
2. The continuous molten metal according to claim 1, wherein a cooling chamber formed inside the inner wall is connected to an annular cooling passage formed between the inner and outer walls, and a refrigerant discharge port from the annular cooling passage is provided on the outer wall. Radiation thermometer device in temperature measuring device.