JPH0820436B2 - Molten metal sampling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal sampler, and more particularly to a sampler with a thermocouple used for the thermal analysis of cast iron and steel components.

[0002]

2. Description of the Related Art A molten metal obtained by melting cast iron is subjected to a thermal analysis method as a so-called pre-furnace test in order to check whether the chemical composition and properties are as desired before casting the melt into a mold. .

For the thermal analysis of the molten metal, the molten metal is generally collected in a container made of a heat-resistant material such as a ceramic, and the end of the thermocouple is connected to an automatic measuring device for thermal analysis. This is done by examining the cooling curve of.

For the above purpose, a container for collecting a sample of molten metal is disclosed in, for example, US Pat. No. 3,267,732.
As shown in No. 6, it has a cup shape with an open top, and the molten metal is manually poured into it using a ladle.

Further, Japanese Utility Model Laid-Open No. 63-161362 discloses that a container having an upper opening at the tip of the holding tube is attached at an angle of 45 degrees with respect to the axis of the holding tube.

Further, Japanese Utility Model Publication No. 1-180647 discloses that
Since the container described in Japanese Utility Model Laid-Open No. 63-161362 is attached to the holding pipe at an angle, it is difficult to pump the molten metal, and it is disclosed that the container having an open top is attached to the holding pipe at a right angle. There is.

All of the above-mentioned conventional containers are for manually pumping molten metal, and those using a holding tube are not suitable for pumping an amount of sample necessary for analysis into a container with an open top. However, there is a problem that the operation of the holding tube is troublesome and the insertion angle of the container with respect to the molten metal surface must be taken into consideration.

In particular, recently, there has been a demand for automating the operation of pouring the molten metal into the container without manual labor. In order to meet such a requirement, it is inconvenient to use a conventional sampling container with an open upper part, and it cannot be applied when the axis of the container has to be obliquely inserted into the molten metal. There is.

[0009]

SUMMARY OF THE INVENTION In view of these problems in the prior art, the present invention collects molten metal of cast iron and steel at a free angle regardless of a manual type or an automatic type. It is an object of the present invention to provide a sampling device that can be inserted into a sample.

Another object of the present invention is to provide a molten metal sampling device capable of rapidly releasing the gas in the molten metal during sampling of the molten metal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a molten metal sampling device 10 of the present invention includes a main body 14 to be attached to one end of a holder 12 made of a paper tube. The body 14 is a suitable insulator, for example a cylinder made of ceramic, and is made of a paper tube so that the holder 12 of a desired length can be inserted into the upper end 16 in FIG.

A temperature sensing device 18 is arranged at the center of the upper end 16. This temperature sensing device 18 is known per se, and comprises a thermocouple 20 made of, for example, platinum / platinum rhodium wire, one end of which is inside the holder 12 at a hollow end 16 above the main body 14. It is connected to a connector 22 which penetrates and connects to a compensating conductor (not shown) which connects to a measuring device (not shown).

The thermocouple 20 is protected by an insulating tube 24 made of, for example, fused silica, and is installed inside a hollow cup type sample container 28 mounted in the lower end portion 26 of the main body 14 along the central axis. It is extended.

The cup-shaped sample container 28 is made of steel and its bottom 30 is close to the distal end of the lower end 26 of the body 14,
The end cavity formed by the end 26 and the container 28 is filled with a heat insulating material, for example refractory mortar 30.

The temperature sensing device 18 is provided on the opening side of the sample container 28.
A plurality of molten metal inflow ports 32 are provided on the peripheral wall of the main body 14 and the container 28 on the connector 22 side in the vicinity of the opening side.

As shown in FIG. 2, the molten metal inflow port 32 has a refractory mortar and a tapered opening 34 formed in the main body 14 so that the sample container 28 has a container 28.
The short tube 36 extends to the central portion near the thermocouple 20 inside. The short tube 36 is preferably made of, for example, quartz or ceramic.

As shown in FIG. 3, a short pipe 36 of the inlet 32 is provided.
Can be eccentrically extended from the inflow port 32 of the container 28 at a certain angle toward the center so that a swirl can be formed in the flow of the molten metal flowing into the container 28.

[0018]

EFFECT OF THE INVENTION Molten metal sampling apparatus 10 of the present invention
Since it is configured as described in detail above, a sample 12 of molten metal is sampled and a holder 12 made of a paper tube is operated to insert a sample container 28 into the molten metal in order to perform thermal analysis thereof. In this case, it is not necessary to insert the holder 12 vertically with respect to the surface of the hot water.

That is, as shown in FIG. 4, when the sample container 28 is inclinedly inserted into the molten metal M, the molten metal flows into the container 28 through the plurality of molten metal inlets 32 and the short tubes 36. At least one of the short pipes 36 and the inlet 32 serve as an opening for degassing the molten metal flowing into the container 28, which is convenient for thermal analysis.

Further, as described with reference to FIG. 3, if the short tube 36 provided at the inflow port 32 of the sample container 28 is biasedly extended toward the center with a certain angle, the short tube 36 A swirl can be generated in the flow of the metal flowing into the container 28 via 36, and the above-described gas venting effect can be further promoted.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a molten metal sampling device of the present invention.

2 is a cross-sectional view taken along the line II-II in FIG. 1 and viewed in the direction of the arrow.

FIG. 3 is a schematic view showing a modification of the arrangement of the short tubes communicating with the molten metal inlet of the apparatus of the present invention.

FIG. 4 is a schematic diagram for explaining the effect when the device of the present invention is obliquely inserted into the molten metal.

[Explanation of Codes] 10 Molten Metal Sampling Device 12 Holder of Paper Tube 14 Main Body 16 One End of Main Body 18 Temperature Sensing Device 20 Thermocouple 22 Connector 24 Insulation Tube 26 Other End of Main Body 28 Sample Container 30 Refractory mortar 32 Molten metal inlet 34 Opening 36 Short tube

Claims (2)

[Claims] 1. A body for mounting an end portion on a holder for obtaining a cooling curve of molten metal, a temperature sensing device including a thermocouple provided on the body, and a thermocouple attached to the body for mounting the thermocouple on a longitudinal center axis thereof. And a plurality of short tubes for inflowing molten metal that extend inward from the outer peripheral wall of the main body through the sample container to a portion close to the thermocouple. A molten metal sampling device characterized by the above. 2. The molten metal sampling device according to claim 1, wherein the molten metal inflowing short tubes are arranged so as to be biased with respect to the thermocouple.