JPH0114929Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for measuring the amount of carbon in molten metal that simultaneously samples the molten metal.

The object of the present invention is to provide a carbon content measuring device for molten metal that can accurately measure carbon content, is easy to manufacture, and is inexpensive.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The molten metal carbon content measuring device of the present invention (hereinafter referred to as the measuring device of the present invention) will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a measuring device according to the present invention, and the measuring device 1 has a main body 2 made of a paper tube or the like.

A collection container 6 is fixed to the tip of the main body 2, and the collection container 6 is made of a heat-resistant material such as ceramics or shell mold, or a heat-resistant metal, and in the illustrated embodiment, as shown in FIGS. 3 and 4. It is formed by stacking a pair of container halves 6a and 6b.

The collection container 6 has a disc-shaped collection chamber 7 and an inflow channel 8 that is eccentrically positioned below the collection chamber 7 and communicates with the collection chamber 7 .

Holes 9, 9 are provided at the top and bottom of the collection container 6, respectively, and temperature sensing means 14 is inserted into the holes 9, 9.

On the other hand, an insulator 5 made of a heat-resistant material is attached to the tip of the main body 2, and the collection container 6 is fixed to the insulator 5 with adhesive or the like.

Further, holes 11 and 18 are provided vertically through the insulator 5, and an inflow pipe 10 made of a heat-resistant material such as a quartz tube is connected to the inflow channel 8 of the collection container 6 through the hole 11, and is connected to the insulator 5 by a refractory cement 27. Fixed.

Further, the temperature detecting means 14 is inserted into the hole 18 of the insulator 5, and the tip of the temperature detecting means 14 protrudes below the insulator 5.

Further, the tip of the temperature sensing means 14 is covered with a cap 26 made of metal or the like.

Next, the temperature detection means 14 has a linear thermocouple protection tube 15 with one end closed of a heat-resistant material such as quartz, as shown in detail in FIG.

The thermocouple protection tube 15 has three thermocouple wires 2.
0, 23, 24, a first thermocouple 16 for measuring the temperature of a metal bath such as steel formed by thermocouple wires 20, 24 and positioned at the tip, and thermocouple wires 23, 2.
A second thermocouple 17 for carbon content measurement formed by 4 and positioned in the middle is housed.

Mutual insulation between the thermocouple wires 20, 23, and 24 is ensured by an insulating tube 19 housed in a thermocouple protection tube 15 and covering the thermocouple wire 20, and a similar insulating tube 22 covering the thermocouple wire 23. Ru.

Returning to FIG. 2, the position of the second thermocouple 17 for carbon content measurement is located at the temperature detection means 14 in the collection container 6.
It is adjusted so that it is preferably located approximately in the center of the collection chamber 7 in the state in which it is attached.

Thermocouple wires 20, 23, 2 of temperature detection means 14
4 is led to the connector 3 by a lead wire 13 via a terminal 12, and the output can be taken out to the outside during measurement.

A method of using the measuring device of the present invention shown in the above embodiments will now be described.

That is, the main body 2 is attached to an insertion device such as a sublance (not shown), and thereby the thermocouples 16, 1
7 is electrically connected to an external device.

In this state, the measuring device 1 is supported by an insertion device such as a sub-lance and inserted from the tip into a bath of metal such as steel.

As a result, the carbon amount measuring device 1 passes through the slag layer floating on the surface of the molten metal, and after passing through the cap 2
6 is melted away, the tip of the temperature sensing means 14 is exposed in the molten metal, and measurement of the temperature of the metal bath, such as steel, is started.

On the other hand, the inflow pipe 10 is exposed in the molten metal, and the molten metal passes through the inflow pipe 10 and the inflow path 8 into the collection chamber 7.
flows into.

Since the inflow path 8 is eccentric with respect to the collection chamber 7, the molten metal is filled into the collection chamber while rotating.

The temperature of the molten metal decreases and solidifies in the collection chamber 7, and this cooling temperature change is detected by the thermocouple 17.

The amount of carbon in the molten metal is determined by this cooling temperature change (with reference to the steel or other metal bath temperature measured by the thermocouple 16).

The measuring device 1 is pulled out of the molten metal after the time required for carbon content measurement has elapsed.

After being pulled up, the collection container 6 is taken out and the halves 6a and 6b are
The solidified sample is taken out and used for analysis such as emission spectroscopy.

FIG. 6 shows another temperature detecting means of the measuring device of the present invention, and the temperature detecting means 14 is installed in a thermocouple protection tube 15 to ensure mutual insulation between three thermocouple wires 20, 23, 24. Separator 25 with approximately cross-shaped cross section
is stored.

In the temperature detection means 14 of FIGS. 5 and 6, the thermocouples 16 and 17 were formed by three thermocouple wires 20, 23, and 24, but four thermocouple wires were used. Needless to say, it's fine.

The measuring device of the present invention has the following effects in the configuration and usage method shown in the above embodiments.

(1) The device for measuring the amount of carbon in molten metal of the present invention has the structure described in the claims of the utility model registration, and in particular, a thermocouple for measuring the temperature of a metal bath of steel or the like is installed in one straight thermocouple protection tube. Since both the thermocouple and the thermocouple for carbon content measurement are housed, the cross section of the protection tube can be made extremely small, and as a result, there is a concern that the cooling temperature change of the molten metal in the collection container will be affected by the protection tube, which itself has a cooling effect. This makes it possible to accurately measure the amount of carbon.

(2) The device for measuring the amount of carbon in molten metal of the present invention has the same configuration as above, and in particular, both the thermocouple for measuring the temperature of a metal bath such as steel and the thermocouple for measuring the amount of carbon are housed in one thermocouple protection tube. Since the thermocouple is housed to form the temperature detection means, the number of parts (itself and accompanying parts) can be extremely reduced compared to the conventional case where two pairs of thermocouples are separately attached to a dedicated insulator, and as a result, manufacturing is easy. can reduce costs.

(3) The device for measuring the amount of carbon in molten metal of the present invention has the same configuration as above, and in particular, two pairs of thermocouples are housed in one thermocouple protection tube, so the thermocouple wires can be taken out all at once from the end. As a result, the wiring of the lead wires leading them to the connector becomes extremely simple.

(4) The molten metal carbon content measuring device of the present invention has the same configuration as above, and in particular, one straight thermocouple protection tube is supported by the collection container while penetrating the collection chamber, so it is firmly fixed. As a result, it can sufficiently withstand impact from molten metal during measurement.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the measuring device of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional view of the vicinity of the tip of the above, Fig. 3 is a front view of the collection container of the above, Fig. 4 is a plan view of the upper half of the same, and Fig. 4 is a plan view of the upper half of the same. FIG. 5 is a longitudinal sectional view of the temperature detection means same as the above, and FIG. 6 is a perspective view of another temperature detection means same as the above. 1: Measuring device, 2: Main body, 3: Connector,
5: Insulator, 6: Collection container, 6a, 6b: Half body,
7: Collection chamber, 8: Inflow chamber, 9: Hole, 10: Inflow pipe, 11: Hole, 12: Terminal, 13: Lead wire, 1
4: Temperature detection means, 15: Thermocouple protection tube, 16:
Thermocouple, 17: Thermocouple, 18: Hole, 19: Insulating tube, 20: Thermocouple wire, 22: Insulating tube, 23: Thermocouple wire, 24: Thermocouple wire, 25: Separator, 26: Cap , 27: Fireproof cement.

Claims (1)

[Scope of utility model registration request] A collection container fixed to the tip of the main body and made of a heat-resistant material and having a collection chamber and an inflow path communicating with the collection chamber; and an inflow connected to the inflow path of the collection container and protruding downward and fixed to an insulator at the tip of the main body. a straight thermocouple protection tube that penetrates the collection chamber and is supported by the collection container while protruding from the tip of the collection container;
A molten metal carbon content measuring device comprising two pairs of thermocouples each positioned at the tip and in the middle of the sampling chamber within the thermocouple protection tube.