JPH0120689Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a molten metal sampling device, and particularly relates to an improvement of a sample sampling container in a sampling device.

(Prior Art) A known sample collection container in a sample collection device for analysis of molten metal, particularly molten steel, hot metal, etc. (hereinafter collectively referred to as molten steel, etc.), has a cylindrical cup shape as shown in Figure 7. . When collecting samples using this container 20, a method is adopted in which the inflowing sample is rapidly cooled from the viewpoint of promoting initial solidification and preventing variations in the solidified structure.

For this reason, it is known that the sample collection container 20 is made of a metal with good thermal conductivity, or is made of a fireproof material and is lined with a chiller 21 as shown by the chain line in the same figure to enhance the cooling effect. (For example, Utility Model Publication No. 56-9978).

Also known is a method of rapidly cooling molten steel or the like by bringing it into contact with a cooling material when the sample is introduced.

(Problems to be solved by the invention) A sample pre-cooled by the conventional method and apparatus starts to solidify due to heat dissipation through the side and bottom surfaces of the sample collection container.

The cylindrical sample taken out from the sample collection device is located at a site that has a coagulated structure suitable as an analysis sample due to the wall thickness and dimensions of the container, and at a location that facilitates analytical work such as cutting and polishing (usually Approximately 30~ in diameter
For a 40 mm cylindrical sample, the cutting position of the sample is approximately 10 to 30 mm from the bottom of the sample), and the sample is cut at this position.
The cut surface is then polished and subjected to spectroscopic analysis such as the Quantback method.

By the way, solidification of the sample progresses almost evenly starting from positions near the side and bottom of the sample collection container, so when the sample is pulled up using an automatic immersion device, such as a sublance, the sample near the planned cutting position is still in an unsolidified state. When an external force such as a mechanical shock or vibration is applied, the unsolidified sample may flow, resulting in a sample with an unstable solidified structure or crystalline structure. This results in poor analysis due to the occurrence of porosity, etc.

In order to avoid this, as shown by the chain line in Figure 7,
It is conceivable to form the bottom of the container 20 into a thick wall 22 using a chiller made of a metal block with a large heat capacity, but although this is effective in accelerating the solidification of the sample in contact with the bottom 22, If it is not sufficient to solidify the nearby sample and there is an unsolidified sample in that area, it is not very effective from the viewpoint of avoiding changes in the solidified structure due to external forces.

The purpose of the present invention is to solve the conventional problems by improving the bottom structure of a sample collection container of a sample collection device for molten steel, etc., and to provide a good metal sample suitable for analysis.

(Means for solving the problem) The present invention has a structure in which the bottom surface of the molten metal sample collection container protrudes inward, thereby increasing the contact area with molten steel, etc., and enhancing the cooling effect. Promote solidification of the molten sample near the planned position,
As a result, even if the sample collection device is subjected to vibration or mechanical shock when it is pulled up, the above-mentioned coagulation structure abnormality does not occur in the sample analysis aspect, and the conventional problems can be solved.

That is, the present invention provides a molten metal sampling device in which a cooling protrusion 10 is formed at the bottom of a sample sampling container 4 and projects into the container.

(Function) Sample collection chamber 7 forming part of sample collection container 4
A cooling protrusion 1 has a heat capacity sufficient to achieve early solidification of the sample and has an increased contact surface area on the bottom surface.
Since 0 is provided, the inflowing molten steel etc. rapidly removes heat by contacting this and starts solidifying.

In the case of molten steel, columnar crystals grow from the quenched surface near the inner surface of the container and solidification progresses inward, but at the same time, due to the cooling action of the cooling protrusion 10 protruding into the inside of the container 4, the center of the container, especially the specimen, is cut. Coagulation near the planned location is also promoted.

As a result, the homogeneous solidified surface of the sample is pushed up, and when the sample collection device is pulled up by an automatic immersion device after sample collection, even if external shocks, vibrations, etc. Since the steel has already solidified, problems associated with the flow of unsolidified molten steel do not occur.

(Example) The molten metal sampling device of the present invention (hereinafter referred to as the device of the present invention) will be described below according to an example shown in the drawings.

FIG. 1 shows an embodiment of the device of the present invention, and the device 1 is installed in an automatic immersion device such as a sublance.
(In Figure 1, there is a temperature measuring element 2 at the tip of the device.
However, this is not required. ) The apparatus 1 has a main body 3 made of a paper tube or the like, and a sample collection container 4 made of metal, such as steel, is housed inside the main body 3.

As shown in FIG. 2, the container 4 is internally divided into an inflow chamber 6 and a collection chamber 7 by a partition 5.

An opening 8 for sample inflow is provided on the side surface of the inflow chamber 6 .

The annular partition 5 is made of ceramic or metal, and has a hole 9 through which the inlet chamber 6 and the collection chamber 7 communicate.

Attached to the bottom of the collection chamber 7 is a bottom plate 11 provided with a cylindrical cooling protrusion 10 having a conical portion 18 at the top of a columnar portion 17 formed to have an outer diameter smaller than the inner diameter of the collection chamber 7.

In this embodiment, the bottom plate 11 with the protrusion 10 is formed separately from the container 4 and is made of metal, such as steel. The protrusion 10 is provided concentrically at the center of the bottom plate 11, and forms an annular gap 16 between the circumferential surface of the protrusion 10 and the circumferential side wall of the collection chamber 7.

3 to 6 show other embodiments of the sampling chamber 7 constituting a part of the sample collection container 4, in which the cooling protrusion 1
0 and the collection chamber 7 are integrally constructed of metal, for example, steel.

That is, in FIG. 3, a cylindrical cooling protrusion 10 having a conical part 18 at the top of a columnar part 17 is integrally provided in the bottom part of the collection chamber 7 in the form of a thick block.

Further, FIG. 4 shows a cooling protrusion 10 integrally protruding from the bottom surface of the collection chamber 7 as a conical thick-walled block.

In FIGS. 5 and 6, a cooling protrusion 10 is provided by forming the bottom surface of the collection chamber 7 into a convex or hemispherical shape by means such as a press, and as a result, the protrusion 10 is formed on the bottom surface. The one provided with the hollow part 19 which opens is shown. In this convex or hemispherical shape, it is also possible to form the cooling protrusion 10 by a means other than pressing and to make the cooling protrusion 10 solid without having the hollow part 19.

In each of these embodiments, it is also possible to further increase the thickness of the cooling protrusion 10 in order to further enhance the cooling effect.

Further, in any of the embodiments, similarly to the embodiment shown in the second drawing, an annular gap 16 is formed between the circumferential surface of the protrusion 10 and the circumferential side wall of the sampling chamber 7, thereby preventing the inflow of molten steel, etc. Although the contact area with the protrusion 10 is increased, radial ribs are provided on the circumferential surface of the protrusion 10 to further increase the surface area, and the protrusion 10 is shaped to become smaller in diameter in a stepwise manner toward the tip to further increase the surface area. You are free to make it bigger.

The sample collection container 4 having the above structure is further integrated into the main body 3 using a paper tube or the like and is held at a predetermined position.

Returning to FIG. 1 and continuing the explanation, an opening 12 on the side of the main body 3 communicates with the opening 8 of the sample collection container 4.
An inflow nozzle 13 made of a refractory material such as ceramics is installed between these openings 8 and 12.

The outer surface of the inflow nozzle 13, that is, the opening 12 of the main body 3
The portion is covered with a combustible material 19 such as a paper tube. (Although the embodiment shown in Fig. 1 uses a paper tube, etc., this covering means is an incidental one.
It may be capped with a soluble metal depending on operating conditions. ) The temperature measuring element 2 protruding from an insulator 14 attached to the tip of the main body 3 is fitted with a protective cap 15 to prevent damage due to impact when immersed in molten steel etc., and measures the temperature of molten steel etc.

The operation of the apparatus of the present invention shown in the above embodiments will be explained next.

That is, in the device 1 of the present invention, the base of the main body 3 is attached to an automatic dipping device such as a sublance, and the tip thereof is inserted into a refining furnace such as a converter.

When it penetrates the slag layer floating on the surface of the molten steel and reaches the inside of the molten steel, the member covering the opening 12 of the main body 3 is burned out and the molten steel etc. flows into the inflow chamber 6 through the inflow nozzle 13.

The molten steel, etc. that flowed into the inflow chamber 6 together with a deoxidizer such as Al (not shown) stored in advance in the inflow chamber 6.
The molten steel is stirred and killed.

The inflowing molten steel is pre-cooled by contact with the wall surface of the inflow chamber 6.

Next, the killed molten steel whose flow rate is controlled by the partition 5 flows into the sampling chamber 7.

In the sampling chamber 7, the killed and precooled molten steel comes into contact with the cooling protrusion 10, which has sufficient surface area and heat capacity for cooling and solidification at least in the vicinity of the sample analysis surface, and is rapidly removed from heat. Begin coagulation.

Solidification of the sample rapidly progresses inward from the contact surface between the molten steel and the protrusion 10 and the side surface of the sampling chamber 7.

In other words, the bottom portion with a large contact surface area due to the protrusion 10 provides a large cooling effect from below, and the tip of the protrusion 10 protruding inward from the center of the bottom greatly promotes solidification of the center of the sample. be done.
In particular, the cooling effect functions in a well-balanced manner near the planned sample cutting position, that is, near the analysis surface, so that no segregation occurs in the sample.

As a result, when the sample collection device is pulled up by an automatic immersion device after filling the sample, even if shock or vibration is applied from the outside, the area where the sample is to be cut, i.e. near the sample analysis surface, has already solidified, so the unsolidified molten steel remains unsolidified. Problems such as disturbance of the crystal structure due to the flow of water do not occur.

In addition, in cases where deoxidizing materials such as Al do not sufficiently react with molten steel and flow into the sample collection chamber, or when fine slag etc. are mixed in, these impurities are removed from the sample containing the planned cutting position using conventional sample collection containers. In contrast, in the container 4 equipped with the protrusion 10 of the present invention, these impurities are solidified at the edge of the sample between the outer periphery of the cooling protrusion 10 and the bottom side wall of the sample container. It was found that the particles were trapped on the walls of the sample collection container, and that they did not precipitate on the sample surface during analysis and did not adversely affect the analysis.

As described above, according to the apparatus 1 of the present invention, a stable sample for analysis can be reliably collected.

(Effects of the invention) The embodiments of the molten metal sampling device of the invention are as described above, and the effects thereof are listed below.

(1) The device of the present invention has the configuration described in the scope of the utility model registration claim, and has a large surface area and heat capacity that promotes cooling and solidification of at least the bottom of the collection chamber of the sample collection container near the sample analysis surface. Since the sample is cooled uniformly, problems such as segregation and destabilization of the metal crystal structure do not occur.

(2) The device of the present invention has the same configuration as above, and in particular, since the inflowing sample is cooled by the wall surface of the collection chamber at the tip of the cooling protrusion, solidification is quick even near the analysis surface, and the refining after filling the sample is possible. Even when the device is taken out of the furnace, external shocks and vibrations do not cause disturbance or segregation of the crystal structure at the analysis site.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view partially broken away showing one embodiment of the device of the present invention, Fig. 2 is a longitudinal sectional view showing one embodiment of the sample collection container, and Figs. FIG. 7 is a vertical cross-sectional view showing another embodiment of the chamber, and FIG. 7 is a vertical cross-sectional view showing a collection chamber according to a conventional example. 1... Sample collection device, 3... Main body, 4... Sample collection container, 5... Partition, 6... Inflow chamber, 7...
Collection chamber, 10...Cooling protrusion, 11...Bottom plate, 16
...Void.

Claims (1)

[Claims for Utility Model Registration] (1) A molten metal sampling device characterized in that a cooling protrusion is formed at the bottom of a sample sampling container to project into the container. (2) The melting device according to claim 1 of the utility model registration, characterized in that a cooling protrusion is formed at the center of the bottom of the container, and a gap is formed between the circumferential surface of the protrusion and the side wall of the container. Metal sampling device.