JPH04104540U - Immersion type continuous temperature measurement probe - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the weight of an immersion type continuous temperature measurement probe using ceramic as a protection tube and improve its handling properties. [Structure] In the immersion type continuous temperature measuring probe in which an internal protection tube 8 is arranged inside the protection tube 1 and a thermocouple 9 is inserted into the internal protection tube 8, the part of the protection tube 1 immersed in the molten metal 6 is made up of a ceramic pipe 7, and the non-immersed part is made up of a steel pipe 3. [Effects] Compared to conventional protection tubes made entirely of ceramics, the weight can be reduced by approximately 25%, handling has been greatly improved, and measurement accuracy and lifespan are comparable.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This device is an immersion type continuous temperature measuring probe that continuously measures the temperature of molten metal, etc. Regarding.

0002

[Conventional technology]

A radiation thermometer is a method to measure the temperature of high-temperature molten metals such as hot metal and molten steel. , light thermometers, thermocouple thermometers, etc. are used, but thermocouple thermometers are more accurate in terms of temperature measurement accuracy. is the most preferred, and commonly used, platinum-rhodium thermocouple tip. This is a consumable thermometer protected by a quartz tube. Usually, the consumable thermometer is used for hot metal, molten steel, etc. If it is immersed in water, the heat-sensitive part will melt in an extremely short period of 10 to 20 seconds, rendering it unusable. Therefore, temperature measurement must be completed in a shorter time than that, and each measurement must be completed in a shorter time than that. The thermometer needed to be replaced. For this reason, the quality of hot metal, molten steel, etc., and operational management are difficult. There is a need for a thermometer that can measure temperature continuously over a long period of time.

0003 For this reason, it is inserted into the high temperature atmosphere to be measured as a protection tube for an immersion thermometer. The outer part is mainly composed of boron nitride (Utility Model Publication No. 55-38290) Publication), alumina is the main component inside the protective tube, which is mainly composed of boride ceramic. A protective tube is arranged, and an insulating tube whose main component is alumina is arranged inside. A temperature sensor coated with precious metal is placed near the heat-sensitive part at the tip of the -299423), or metal molybdenum, zirconia ceramic composite A protection tube made of composite material has been proposed.

0004

[Problem that the idea aims to solve]

For continuous immersion temperature measurement of molten metal using the conventional ceramic protection tube mentioned above. The probe is suitable for continuous temperature measurement of molten metal, but both the immersed and non-immersed parts are thick. Yes, it is made of heavy ceramic. For this reason, conventional immersion continuous measurement The temperature probe weighs approximately 20 kg, and the ceramic protection tube is impact-resistant. Because temperature measurement probes are vulnerable to Therefore, improvements in handling are desired.

[0005] The purpose of this invention was to reduce the weight and greatly improve handling of molten metal. An object of the present invention is to provide an immersion type continuous temperature measuring probe.

[0006]

[Means to solve the problem]

The inventors of the present invention conducted extensive studies to achieve the above object. As a result, the immersion part By using a protective tube in which the non-immersed part is made of ceramic and the non-immersed part is made of steel, the whole part is safe. Approximately 25 lbs. for an immersion type continuous temperature measuring probe of the same length that uses a Lamix protection tube. % weight reduction, and arrived at this idea.

[0007] In other words, this idea places an internal protection tube inside the protection tube, and heat is inserted into the internal protection tube. Immersion of the protective tube into molten metal in an immersion type continuous temperature measurement probe with an inserted couple. Immersed type continuous temperature measuring plate consisting of a ceramic tube in the part and a steel tube in the non-immersed part. It's a robe.

[0008]

[Effect]

In this invention, the part of the protective tube that is immersed in the molten metal is made of a ceramic tube, so the protective tube will not be melted or eroded by the molten metal, and the part that is not immersed is made of steel, so that the entire The weight can be reduced by approximately 25% compared to a protection tube made of ceramics. The ceramics constituting the part of the protective tube immersed in molten metal are preferably those that have excellent corrosion resistance against molten metals such as hot metal and molten steel, and have sufficient strength, heat resistance, and thermal conductivity, such as ZrB ₂ , Examples include ceramics made of materials such as TiB ₂ and TaB ₂ .

[0009] Connection of the ceramic tube in the part of the protection tube immersed in molten metal and the steel pipe in the non-immersion part In this method, a socket into which a ceramic pipe fits is welded to the lower end of a steel pipe, and a ceramic pipe is attached to the socket. Fit the mix tubes and seal them with an adhesive such as glass cement, or Seal using adhesive metal.

0010

【Example】

The details of this invention will be explained below based on FIG. 1 showing an example of implementation. Figure 1 shows this FIG. 2 is a longitudinal cross-sectional view of the invented immersion type continuous temperature measuring probe. In FIG. 1, 1 is a protection tube, and the protection tube 1 is a non-contact tube with a terminal box 2 welded to its upper end. A steel pipe 3 forming the immersed part and a steel sock jointed to the lower end of the steel pipe 3 by welding. The socket 4 is fitted into the socket 4 and sealed and fixed with an adhesive 5 such as glass cement. It consists of a ceramic tube 7 forming a part immersed in molten metal 6. An internal protective tube 8 is inserted into the protective tube 1, and a thermocouple 9 is inserted into the internal protective tube 8. The terminal of the thermocouple 9 is connected to a temperature recorder (not shown) through a compensating conductor 10. be done. Note that 11 is a probe holding arm.

[0011] As shown in FIGS. 2 and 3, a large tap trough 21 connected to a blast furnace tap hole (not shown) The immersion type of this invention having the above structure is immersed in the hot metal 23 near the downstream of the skinner 22. Continuous temperature measurement probe 24 is the same length as the conventional immersion tube whose entire protective tube is made of ceramics. The weight of each continuous temperature measurement probe was measured. As a result, the protection tube Compared to the conventional immersion type continuous temperature measuring probe, which is entirely made of ceramic, weighs 20 kg. However, the immersion type continuous temperature measuring probe 24 of this invention weighs 15 kg, which is a 25% weight reduction. We were able to achieve this goal. In addition, in the figure, 25 is the slag, 26 is the discharge gutter for the slag 25, and 27 is the slag. It is a hot metal trough.

0012 In addition, each immersion type continuous temperature measurement probe is connected to the tap hole of the blast furnace. Immersed in the hot metal 23 near the downstream of the skimmer 22 of the gutter 21, and heated to 1500 to 1530°C. The hot metal temperature was measured. As a result, only the part immersed in the molten metal is made of ceramic. The probe of this invention is different from the conventional probe whose entire protective tube is made of ceramic. The accuracy is comparable to that of any other, and the accuracy has been maintained for about 140 hours without any interruptions due to thermocouple deterioration. I was able to measure the temperature normally.

[0013] Furthermore, the immersion type continuous temperature measurement probe of this invention is lightweight, weighing only 15 kg. Therefore, it was possible to carry it to the temperature measuring position and attach it by one person, but the conventional immersion type continuous The temperature measurement probe weighs 20 kg and is difficult to carry and attach to the temperature measurement position by one person. there were.

[0014]

[Effect of the idea]

As mentioned above, according to this invention, the entire conventional protection tube is made of ceramics. The weight can be reduced by approximately 25% compared to the existing immersion type continuous temperature measurement probe. This makes it possible for one person to transport and install the device, greatly improving handling. Moreover, There was no inferiority in terms of measurement accuracy and lifespan.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the immersion type continuous temperature measuring probe of this invention.

FIG. 2 is a plan view of the main part of the tap hole of the blast furnace.

FIG. 3 is a vertical cross-sectional view of the main part of the tap tap trough of the blast furnace.

[Explanation of symbols]

1 Protection tube 2 Terminal box 3 Steel pipe 4 socket 5 Adhesive 6 Molten metal 7 Ceramic tube 8 Internal protection tube 9 Thermocouple 10 Compensation conductor 11 Probe holding arm 21 Tapping trough 22 Skinma 23 Hot metal 24 Immersion type continuous temperature measurement probe 25 Slag 26 Discharge gutter 27 Hot metal trough

Claims (1)

[Scope of utility model registration request] Claim 1: In an immersion type continuous temperature measuring probe in which an internal protection tube is disposed inside the protection tube and a thermocouple is inserted into the internal protection tube, the portion of the protection tube immersed in the molten metal is a ceramic tube, Immersion type continuous temperature measurement probe whose non-immersion part is made of steel pipe.