JPH06323919A - Temperature measuring device of molten metal - Google Patents

Abstract

PURPOSE:To prevent a molten metal from flowing out when a protective outer tube is damaged and to increase the safety of a temperature measuring device under the severe measuring surroundings of the molten metal part, etc., by a method wherein the temperature measuring device is protected doubly by the protective outer tube and an inner tube whose mutual base parts have been fixed and bonded and the base part of an insulating tube is closed by a metal body. CONSTITUTION:A temperature measuring device 3 measures a molten metal by thermocouple wires 14 which have been protected doubly by a protective outer tube 11 and a protective inner tube 9. When the outer tube 11 is damaged, the molten metal creeps into a gap 10. However, since the gap 10 is closed by the base part of the inner tube 9 and of the outer tube 11, it does not flow out to a terminal body 4. In addition, when the inner tube 9 is damaged, the molten metal flows to the direction of the body 4 along the outer face of an insulating tube 6. However, the molten metal is cooled and solidified while it flows between the body and a connecting socket 5a, and it is solidified surely when it reaches a metal body 7 in which a gap is narrower. When only the outer tube 9 is damaged, it can be taken away from the socket 5a and the metal body 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an object to provide a temperature measuring device for molten metal which can be safely used even in a severe measurement environment where molten metal such as a flowing part of an automatic pouring furnace is in an excessively flowing state. And

[0002]

2. Description of the Related Art Conventionally, a temperature measuring device for molten metal used in a flowing part of an automatic pouring furnace has a severe measuring environment in which the molten metal is in an excessively flowing state, so that the protective tube is broken. Occasionally, an accident such as the accident occurred. When such an accident occurs, molten metal flows into the protective pipe, and in the case of multiple protective pipes, etc., if all protective pipes are broken, the molten metal will flow into the terminal part through the insertion hole of the insulating pipe, and it will be extremely dangerous. However, it may cause more damage to the device. Further, even if there is no abnormality in the protective tube near the insulating tube, the insulating tube, and the thermocouple inside the insulating tube, the entire apparatus must be replaced, which is an uneconomical structure.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above conventional problems and can be safely used even in a severe measurement environment where molten metal such as flowing water of an automatic pouring furnace is in an excessively flowing state. An object is to provide a temperature measuring device for molten metal.

[0004]

To achieve the above object, the present invention provides a connection socket screwed to a terminal body, a connection pipe screwed to the tip of the connection socket, and the connection pipe. A protective outer tube screwed to the tip of the pipe, a protective inner tube housed in the protective outer tube through a gap and fixed to each other at their bases, an insulating tube housed in the protective inner tube, and the insulation The present invention proposes a temperature measuring device for molten metal, which comprises a thermocouple housed in a pipe and a metal body which is fixed by penetrating the base of the insulating pipe and screwed to an end face of the connection socket.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A molten metal temperature measuring device according to the present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 shows the temperature measuring device of the present invention together with an automatic pouring furnace, and the temperature measuring device (3) of the present invention is attached to the flowing part of the automatic pouring furnace (1).

As shown in FIGS. 2 and 3, the temperature measuring device (3) has a connection socket (5a) made of stainless steel or the like which is screwed to the terminal body (4). A connecting pipe (5b) made of stainless steel or the like is screwed to the tip of the connecting socket (5a).

A protective outer tube (11) made of alumina magnetic tube or the like and having its base portion reinforced by a base reinforcing tube (13) is screwed to the tip of the connecting pipe (5b). A protective inner tube (9) made of an alumina magnetic tube or the like is housed in the protective outer tube (11) through a gap (10).

The outer surface of the base of the protective inner tube (9) and the inner surface of the base of the protective outer tube (11) are made of a refractory adhesive such as refractory cement (1).
They are fixed to each other by 2) and the gap (10) is closed. An insulating tube (6) made of ceramic or the like is housed in the protective inner tube (9), which is doubly protected by the protective outer tube (11) and the protective inner tube (9). A pair of thermocouple wires (14) of a platinum-platinum-rhodium alloy-based thermocouple (R thermocouple or the like) are inserted and housed in the pair of insertion holes of the insulating tube (6).

The base of the insulating tube (6) penetrates through the connection socket (5a) and projects into the terminal body (4) through the hole of the metal body (7). The metal body (7) is screwed to the end face of the connection socket (5a), and the insulating pipe (6)
Are fixed in a penetrating state by a fireproof adhesive (8).

The functions of the temperature measuring device for molten metal of the present invention shown in the above embodiment are as follows. That is, the temperature measuring device (3) measures the temperature of the molten metal (2) with the thermocouple wire (14) that is doubly protected by the protective outer tube (11) and the protective inner tube (9).

However, if the protective outer tube (11) is damaged for some reason, the molten metal penetrates into the gap (10). However, the gap (10) has a protective outer tube (11) and a protective inner tube (9).
Since it is closed at the base of the terminal, it cannot flow out to the terminal body (4).

Further, when the protective inner tube (9) is broken, the molten metal flows along the outer surface of the insulating tube (6) toward the terminal body (4). However, the molten metal is cooled as it flows between it and the connection socket (5a).

As a result, the molten metal is cooled and solidifies, but when it reaches the metal body (7), the gap is narrower and solidifies reliably. When only the protective outer tube (11) is damaged, it can be removed from the connection socket (5a) or the metal body (7).

Even if the protective inner pipe (9) is damaged, the molten metal will not flow out to the terminal because it will solidify in the narrow gap between the metal body (7) and the insulating pipe (6).

[0015]

The embodiments of the temperature measuring device for molten metal of the present invention are as described above, and the effects thereof are listed below. (1) In the temperature measuring device of the present invention, since the bases of the protective outer tube and the protective inner tube are fixed to each other, even if the protective outer tube is damaged, the molten metal does not flow out to the terminal body. (2) In the temperature measuring device of the present invention, since the base of the insulating tube is closed by the metal body, even if the protective inner tube is damaged, the metal body solidifies and the molten metal does not flow out to the terminal body. (3) In the temperature measuring device of the present invention, the protective outer tube and the protective inner tube are fixed and the insulating tube is separated from them. Therefore, when only the protective outer tube is damaged, the insulating tube alone can be easily removed. It may be connected and exchanged with the protective outer tube.

[Brief description of drawings]

FIG. 1 is a sectional side view of an automatic pouring furnace in which a molten metal temperature measuring device of the present invention is used.

FIG. 2 is a partial cross-sectional side view of the temperature measuring device for molten metal of the present invention.

FIG. 3 is a sectional side view of a main part of the temperature measuring device for molten metal according to the present invention.

[Explanation of symbols]

 1 Automatic pouring furnace 2 Molten metal 3 Temperature measuring device 4 Terminal body 5a Connection socket 5b Connection pipe 6 Insulation pipe 7 Metal body 8 Fireproof adhesive 9 Protective inner tube 10 Gap 11 Protective outer tube 12 Fireproof adhesive 13 Base reinforcement Tube 14 thermocouple wire

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Kanakawa 1-7-10 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture Kawaso Electric Industry Co., Ltd. (72) Toru Kawabata 1 Nishihonmachi, Nishi-ku, Osaka City, Osaka Prefecture 7th-10th Kawaso Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. A connection socket screwed to a terminal body, a connection pipe screwed to the tip of the connection socket, a protective outer tube screwed to the tip of the connection pipe, A protective inner tube housed in the protective outer tube through a gap and fixed to each other at their bases, an insulating tube housed in the protective inner tube, a thermocouple housed in the insulating tube, and a base of the insulating tube. Temperature measuring device for molten metal, which comprises a metal body which is penetrated and fixed and is screwed to the end face of the socket for connection.