JP2002022732A - Molten metal sample sampling device and molten metal sample sampling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molten metal sample sampling device and a molten metal sample sampling method especially suitable for molten metal sampling carried out by means of a conventional temperature measurement system separately from a temperature measurement operation and capable of sampling stably in a good condition free of defective filling without any influence depending on the depth in immersion of a sample die. SOLUTION: This molten metal sampling device is provided with an outer cylinder having the sample die inside and a holding cylinder partially inserted into the outer cylinder for holding and conveying the outer cylinder into the molten metal. The sample die is provided with a hollow part filled with molten metal into an optional shape, a sample introducing part to the hollow part, and a gas vent small hole. In the holding cylinder, the front end on the outer cylinder insertion side is sealed, while a gas permeable part for discharging gas is arranged between the inside wall of the outer cylinder and the outside wall of the holding cylinder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten metal sampling apparatus capable of easily collecting a molten metal sample for various analyses,
And a method for sampling a molten metal sample.

[0002]

2. Description of the Related Art Conventionally, in a steelmaking process, a sample of a metal in a molten state is sampled, and a composition analysis of a metal component by an emission spectroscopic analysis or a gas analysis of C, S, N, etc. is carried out to control the process. Product management is being performed. As one of the molten metal sample collection devices used at this time, a sample type having a hollow sample inlet at one end of a heat-treated paper tube as shown in FIG. 3 is held. The used configuration is used. In such a molten metal sampling apparatus, the tip on the side where the sample mold is installed is immersed in a molten metal bath, and the molten metal is pushed into the sample mold through the sample inlet located at the bottom of the sample mold and filled. Thereafter, the molten metal is collected by pulling up the sample collecting device from the molten metal bath. After that, a solidified molten metal sample is taken out from a sample mold composed of a split mold, and a sample having a shape suitable for various analyzes is prepared using the sample, and is used for various analyses. According to this molten metal sampling device, it is possible to obtain a good molten metal sample without the influence of the slag floating on the upper portion of the molten metal bath, and to quickly prepare various analytical samples. There is an advantage that a molten metal sample having a shape can be obtained.

Here, as a method of immersing the above-mentioned molten metal sample collecting apparatus in a molten metal bath for sampling, manual sampling may be performed, but daily process management and product management are performed quickly and simply. There have been various attempts at automatic sampling. However, a great deal of cost is required to newly build an automatic sampling system solely for sampling a molten metal. Therefore, a temperature measurement system for hot metal, molten steel, or the like, which has conventionally been automatically measured, is used to automatically sample a molten metal. For example, SAMO, L-SA
MO (both trade names, manufactured by Osaka Oxygen Co., Ltd.) is equipped with a sampling part at the tip of the consumable immersion thermocouple used for measuring the temperature of hot metal and molten steel. Alternatively, it is possible to collect a molten metal sample of various shapes such as a rod shape.

However, in this case, since the temperature measuring section and the sample collecting section coexist at the tip of the consumable immersion thermocouple, the structure becomes more complicated than that intended only for temperature measurement, and the cost is reduced. It is high. On the other hand, the temperature measurement and the sampling of the molten metal do not necessarily have to be performed at the same time.For example, during the refining process of molten steel, the temperature measurement is performed frequently, but in comparison, the sampling of the molten metal is performed at intervals. It is done in. In some cases, the sampling of the molten metal is performed independently irrespective of the temperature measurement. When only such temperature measurement or sampling of the molten metal is performed alone, it is not economical to use an expensive member capable of simultaneously performing the temperature measurement and the sampling of the molten metal as described above. Therefore, there is a need for a molten metal sampling device that utilizes a temperature measurement system and that can sample molten metal independently.

On the other hand, the temperature control system which can be controlled as described above is used, and an exchange-type tip having an electrode chip for temperature measurement is not attached. A method of sampling a molten metal sample having a desired shape by attaching a molten metal sample collecting device having a tip to a tip is known. In this case, without measuring the temperature of the molten metal, the tip of the temperature measuring probe used in the conventional temperature measuring system is transported to an arbitrary position in the molten metal bath, and the tip is kept there for a certain period of time. Only the transport and position control functions of holding are used. This will be described in more detail with reference to FIG.

First, a temperature measuring system that can be used in this case will be briefly described. As a typical example, a consumable immersion thermocouple as described above is known. In the temperature measurement system, a temperature measurement probe in which a temperature measurement electrode tip is incorporated at the end of a paper tube is usually mounted on a temperature measurement lance (see FIG. 4). The lance for temperature measurement in the temperature measurement system is configured to be able to move freely up and down and left and right according to the signal, so that the temperature measurement probe attached to the tip can be transported and held at any position in the molten metal bath In addition, a cable for transmitting the signal of the electrode tip at the tip to the measuring instrument is provided inside the lance for temperature measurement, and also serves as a transmission tube. A cable contact is provided at the tip of the tube of the temperature measuring lance, and a paper tube of a temperature measuring probe is inserted into the tip of the lance, and a connecting portion of the temperature measuring electrode tip of the temperature measuring probe is connected to this contact. By doing so, the temperature measuring probe can be detachably mounted on the temperature measuring lance. here,
The contact point of the cable to be connected to the electrode tip is provided so as to be exposed at the tip of the lance inside the tube (FIG. 2).
reference). Since the molten metal temperature measurement system has the above-described configuration, the temperature measurement can be repeated only by replacing the temperature measurement probe having the electrode tip, and the configuration of the temperature measurement probe is appropriately adjusted. , It is possible to measure the temperature at a desired position and under a desired temperature range according to the object to be measured.

In the conventional example, the temperature measuring system described above is used, and a temperature measuring probe is not mounted on a temperature measuring lance. Instead, a molten metal sampling device as shown in FIG. 3 is attached. Sampling is performed by doing. The device comprises:
A sample mold consisting of a split mold that can make the hollow part a desired shape,
An outer cylinder for holding the sample mold and protecting the sample mold from the molten metal when immersed in a molten metal bath, and a holding cylinder connected to a part inserted into the outer cylinder. It consists of a tube. Sampling is performed by inserting the tip of a temperature measuring lance into the holding tube.

In the above-mentioned conventional method, as shown in FIG. 3, in order to protect a contact point of a cable provided in a state of being exposed at a distal end portion in a tube of a temperature measuring lance, a holding portion into which the lance is inserted is provided. The opening at the end of the cylinder is sealed with a heat-resistant material such as gypsum. On the other hand, in the portion sealed with gypsum or the like, the diameter of φ is 1 m as a path for the gas that is discharged by the molten metal entering the hollow portion of the sample type.
About m through holes are provided. According to the method for sampling a molten metal using such a temperature measuring system, it is possible to sample a molten metal sample having a desired shape while appropriately controlling the position in the molten metal bath, the timing of sampling, and the like.

However, according to the study of the present inventors, when the above-mentioned conventional molten metal sampling apparatus is used, depending on the position where the molten metal is immersed in the molten metal bath,
It has been found that the solidified molten metal sample taken out of the split mold frequently causes insufficient filling, and a situation in which the analysis sample cannot be supplied stably occurs. The occurrence of such a situation, in turn, means that daily process management and product management in the steel making process and the like are not performed stably,
Have a significant impact. Further, in the above-mentioned conventional molten metal sample collecting apparatus, the molten metal was pushed into the sample mold because the distal end in the holding tube for inserting the distal end of the temperature measuring lance was not completely sealed. At this time, it was found that the contact point of the cable provided in a state exposed at the tip of the tube of the temperature measuring lance may be stained by splashes of molten metal or the like. The occurrence of such contamination causes the temperature measurement function, which is the original use of the temperature measurement lance, to be impaired, and causes a serious situation in which the replacement of the contact portion is accelerated and the life of the temperature measurement lance is shortened.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sample type which is particularly suitable for a case where a conventional temperature measuring system is used and a molten metal is sampled independently from a temperature measuring operation. It is an object of the present invention to provide a molten metal sampling device capable of performing stable sampling in a good state without being affected by a position at the time of immersion.
Further, an object of the present invention is to enable automatic sampling by utilizing the conventional temperature measuring system as described above, and to fill a hollow portion of a sample shape having a desired shape with a molten metal in a favorable state. It is an object of the present invention to provide a molten metal sampling device that can be stably performed and a method for sampling a molten metal sample. Another object of the present invention is to provide a molten metal sampling apparatus and a molten metal sampling apparatus in which, when sampling is performed using a conventional temperature measuring system, the contacts of the cable never become dirty and the durability is not impaired. It is to provide a sample sampling method. Further, the object of the present invention is
Provided is a molten metal sampling device and a molten metal sample sampling method that can contribute to stably performing daily process management and product management in a steel making process and the like by enabling rapid analysis of molten metal. It is in.

[0011]

The above objects are achieved by the present invention described below. That is, the present invention provides a sample mold, an outer cylinder for holding the sample mold, and a sample mold and an outer cylinder partially inserted into the outer cylinder for holding and transporting the sample mold and the outer cylinder in the molten metal. A molten metal sampling device having at least a holding cylinder of the type described above, wherein the sample type is a hollow part filled with the molten metal in at least an arbitrary shape, a sample introduction part for guiding the molten metal to the hollow part, and a gas vent. And the holding cylinder has a sealed end at the side inserted into the outer cylinder, and a portion of the holding cylinder inserted into the outer cylinder has an outer end. A sampler for molten metal and a method for sampling a molten metal sample, characterized in that a gas permeable portion for exhausting gas is provided between an inner wall of the cylinder and an outer wall of the holding cylinder.

[0012]

Next, the present invention will be described in more detail with reference to preferred embodiments. The present inventors have conducted intensive studies to solve the above-mentioned problems of the prior art, and as a result, the lack of filling of the molten metal sample occurring in the conventional molten metal sampling apparatus having the structure shown in FIG. The present invention was found to be due to the fact that the exhaust balance of gas such as air emerging from the hollow portion of the sample mold caused by the effect of the depth in the molten metal bath when immersed was not in a good state. Reached. Hereinafter, this will be described.

When the molten metal is collected by using the conventional molten metal sampling apparatus as shown in FIG. 3, the principle that the molten metal is filled in the sample mold is as follows. When the sample is immersed in the sample tube, the molten metal is pushed into the hollow portion of the sample type by the pressure applied to the other end of the quartz tube having one end inserted into the sample inlet of the sample type on the side to be immersed. The pushing force is considered to depend on the amount of pressure applied to the other end opening of the quartz tube. The amount of pressure can be changed depending on the depth of the immersion of the sample mold in a molten metal bath such as molten steel and the immersion time, but usually, a paper tube is used as the outer cylinder for holding the sample mold. So that the time is 3 ~
4 seconds is the limit. Therefore, it is considered that the direct influence on the force for pushing the molten metal into the hollow portion of the sample mold depends on the depth at which the sample mold is immersed.

[0014] On the other hand, for example, the refining process of steel is diversified, and the furnace capacity, depth and temperature (1,500 to
1,650) and the like, the fluidity and pressure at each position in the molten metal bath vary widely, so the location of the molten metal to be collected is, for example, 2 mm in the depth direction in the molten metal bath.
There is a width of about 00 to 1,000 mm. Therefore, in order for the molten metal to be smoothly pushed into the sample mold and filled in a satisfactory state without any shortage, the molten metal sampling device should be configured to cope with this pressure change. This is necessary, and it is considered that it is necessary to maintain a good exhaust balance of gas from the hollow portion of the sample type. For example, when collecting a sample in a shallow portion of a molten metal bath, the amount of pressure applied to the opening of the quartz tube is reduced. It is necessary to enlarge the through hole provided in the portion sealed with gypsum or the like. On the other hand, as shown in FIG. 3, when this through hole is enlarged, the contact point of the cable exposed and provided in the temperature measuring lance may be contaminated by splash of molten metal or the like. For this reason, in the conventional molten metal sampling apparatus shown in FIG. 3, there is a mechanical contradiction that the diameter of the through hole cannot be increased, and it is considered that this has led to defective filling of the molten metal sample. .

That is, in the conventional molten metal sampling apparatus, as described above, the holding tube is used to protect the contact point of the cable at the tip of the tube of the temperature measuring lance used at the time of sampling. A heat-resistant lid made of gypsum or the like is provided in the tip opening on the sample mold side. On the other hand, a through hole is provided in the lid for the purpose of exhausting gas such as air coming out of a hollow portion of the sample mold in the process of pushing the molten metal into the sample mold. At this time, the size of the through-hole is made extremely small so that the contact point of the cable exposed at the tip of the tube of the temperature measuring lance is not contaminated by the exhausted gas. The present inventors have studied and found that if a heat-resistant lid at the opening of the tip end of the holding cylinder is provided with a through-hole having a larger diameter, the problem of insufficient filling of the molten metal into the sample mold can be solved. In this case, however, it was found that the contamination of the contact point of the cable at the tip of the tube of the temperature measuring lance became remarkable. Furthermore, even if the diameter of this through hole is extremely small, as long as the above-mentioned conventional structure is adopted,
It was also found that it was not possible to completely prevent the occurrence of dirt on the contact points of the cable, and this would cause the durability of the temperature measuring lance to be impaired.

Therefore, in the molten metal sample collecting apparatus of the present invention, the holding tube is completely sealed without providing a through-hole at the tip opening thereof, while the inner wall of the outer tube for holding the sample mold is provided with the inner wall of the holding tube. By providing a gas permeable part between the outer cylinder having the sample mold and the outer wall of the holding cylinder for transporting and holding the outer cylinder having the sample type in the molten metal and being partially inserted into the outer cylinder, the inside of the small container is provided. At the same time as ensuring the exhaust balance to smoothly exhaust gas such as air coming out from the outside to the outside, at the same time preventing the above-mentioned contamination of the cable contacts completely, the problem of insufficient filling of the sampled molten metal and the temperature measurement Solves the problem of maintaining the durability of the lance at once. Hereinafter, the apparatus for sampling a molten metal of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic cross-sectional view of a molten metal sampling device of the present invention, and FIG.
A schematic cross-sectional view in the case where the molten metal sampling device of the present invention is mounted on a temperature measuring lance used in a temperature measuring system is shown.

As shown in FIG. 1, the molten metal sampling apparatus of the present invention basically comprises an outer cylinder, a holding cylinder partially inserted into the outer cylinder, and an outer cylinder. It consists of a sample type held inside. And the features are
The tip in the outer cylinder of the holding cylinder is completely sealed, and
In the portion where the holding tube is inserted into the outer tube, a gas such as air coming out of the hollow portion of the sample mold as the molten metal is pushed in between the inner wall of the outer tube and the outer wall of the holding tube. A gas permeable portion for exhausting gas is provided. Hereinafter, these will be described in detail.

As a method for sealing the tip of the holding cylinder in the outer cylinder, when the molten metal is pushed into the sample mold, the air exhausted from the hollow portion of the sample mold through the gas vent small hole. Any method can be used as long as the hot gas such as described above can be prevented from entering the holding cylinder. Specifically, the opening may be completely sealed with a heat-resistant material, such as filling the opening with gypsum or covering with a steel plate (see FIG. 1).
As the holding tube, a paper tube is usually used, but it is not limited to this. In addition, the shape is inserted into the holding tube of the molten metal sampling device of the present invention, the tip of the temperature measuring lance used in the temperature measuring system to be used,
Any device may be used as long as it can hold and transport the molten metal sample collecting device of the present invention by the temperature measuring lance without falling down when it is lifted and moved up and down in this state.

As shown in FIG. 1, the holding cylinder as described above is installed with a part thereof inserted into the outer cylinder. In this case, the molten metal sample collecting apparatus according to the present invention is characterized in that the holding cylinder is inserted into the outer cylinder, and a gas such as air is supplied between the outer cylinder inner wall and the outer wall of the holding cylinder where the both overlap. It is characterized by providing a gas permeable part which becomes a path of the air. The method for providing the gas permeable portion is not particularly limited. For example, as shown in a top view of FIG. 1B, a gap formed by disposing a spacer between the outer cylinder and the holding cylinder. Can be a gas permeable portion. As a specific forming method, a paper cylinder having a diameter approximately the same as or slightly smaller than the holding cylinder is prepared, and a part thereof is cut in the height direction, and this is cut between the outer cylinder and the holding cylinder. When these are fixed in a bundle with a stapler or the like, a gap that can easily pass the gas can be obtained. The spacer may be provided on all of the overlapping portions of the outer cylinder and the holding cylinder, or as shown in FIG.
It may be provided in a part. Further, FIG. 1 shows an example in which the gap is provided at one place, but the present invention is not limited to this, and the gap may be provided at a plurality of places.

The gas permeable portion for exhausting gas such as air provided between the inner wall of the outer cylinder and the outer wall of the holding cylinder is not limited to the above-described one, and may have the following configuration. For example, although not shown, a filling member is provided in a state of being filled between the inner wall of the outer cylinder and the outer wall of the holding cylinder, and a hollow pipe is embedded in a part of the filling member to thereby form an inner wall of the outer cylinder. A gas permeable portion for exhausting gas may be provided between the gasket and the outer wall of the holding cylinder. Further, the material for forming the filling member provided between the inner wall of the outer cylinder and the outer wall of the holding cylinder may be formed of a porous material having open cells. When a gas permeable portion for exhausting gas is formed between the inner wall of the outer cylinder and the outer wall of the holding cylinder by these methods, the depth at which the sample mold is immersed is in the range of 200 to 1,000 mm. With respect to the fluctuation of the amount of pressure applied to the opening of the quartz tube, which is the entrance of the molten metal into the sample mold, the exhaust gas of the gas exhausted from the hollow portion of the sample mold is maintained in a well-balanced state. It is preferable to design.

The outer cylinder constituting the molten metal sample collecting apparatus of the present invention is provided with a sample mold formed of a mold for collecting molten metal, which is immersed in a molten metal bath. Has the role of protecting, further, by holding the sample mold, transport the sample mold to an appropriate position in the molten metal bath,
It is configured so that molten metal can be collected at that position. Such an outer cylinder is usually made of a paper tube such as a cardboard of about 1 to 5 mm, and it is preferable to use one whose surface is heat-treated. As the heat-resistant treatment, a heat-resistant ceramic is applied to the surface of the paper tube, and the outer cylinder has at least a two-layer structure, the layer constituting the inner wall is made of paper, and the heat-resistant ceramic is in contact with the molten metal. It is preferable to use an outer layer formed of a heat-resistant material. Examples of the heat-resistant material that can be used at this time include, for example, heat-resistant ceramics such as ceramic fiber (such as IBIWOOL) and super sleeve (product name, manufactured by IBIDEN Co., Ltd.),
Diatomaceous earth (SiO ₂ system), Koling soil (kaolin, Al ₂ O ₃
• SiO ₂ system). If the outer cylinder has a two-layer structure using such a heat-resistant material, when collecting molten metal, it is possible to effectively prevent carbon contamination that may be caused by burning of the paper tube. Accurate analysis becomes possible when performing carbon analysis of low carbon steel.

As described above, the holding cylinder is inserted at one end of the outer cylinder made of the above-mentioned material, but as shown in FIG. 1, a sample mold is installed at the other end. You. As a method, when the tip of the outer cylinder on the sample type side is immersed in a molten metal bath, at a desired position in the molten metal bath,
What is necessary is just to be comprised so that a molten metal sample may be pushed into the hollow part of a sample type | mold from the sample inlet of a sample type. Figure 1
In the example shown in (1), one end of the quartz tube is inserted into the sample introduction port of the sample type in a state of protruding from the sample introduction port, and a cap is provided at the end of the protruded quartz tube. When the sample collection device is immersed in the molten metal bath, the cap does not immediately push the molten metal into the sample mold. It is intended to be pushed into the hollow part of the sample type. As a material for forming the cap, for example, a metal such as a thin iron plate may be used.

In this way, it is possible to take a sample at a desired position in the molten metal bath without being affected by the slag floating above the molten metal bath. That is, when passing through the slag portion at the top of the molten metal bath and reaching a certain sampling position, the cap made of metal or the like at the tip of the quartz tube melts, and thereby the quartz placed in the sample introduction section. Through the tube, the molten metal penetrates into the hollow part of the sample type to perform sampling. In the example shown in FIG. 1, the double cap is used to protect the tip of the quartz tube and to more reliably perform sampling at an appropriate position.

Further, in the example shown in FIG. 1, a ceramic mold member having an opening at the center is used as a method for attaching and holding the sample mold at one end of the outer cylinder. In this way, the sample introduction part and the quartz tube can be inserted into such a mold member and attached in such a manner as to cover the opening of the outer cylinder. This makes it easier to assemble the apparatus for collecting a sample of molten metal, and can eliminate the complexity of assembling.

Any type of sample can be used as a sample of the molten metal sampling apparatus of the present invention. For example, it is formed of a metal material such as an iron plate having a thickness of several mm or a heat-resistant ceramic material which has been conventionally used. What is necessary is just to use what comprised two right-and-left symmetrical iron half bodies so that it may be easy to take out the solidified molten metal sample. Further, it is preferable to use a solidified molten metal sample having a hollow portion so that the sample for analysis can be easily prepared. For example, as mentioned earlier,
By using a so-called lollipop type with a thicker upper part and a thinner lower part in the hollow part, various analyzes can be performed from the solidified molten metal sample compared to the conventional disk-shaped sample with a uniform thickness. Preparation of a sample for use becomes much easier.

That is, if the upper portion of the hollow portion of the sample type is made thicker and the lower portion is made thinner, a thick disk-shaped sample having a thickness of 4 to 10 mm, which is optimal for an emission spectroscope, etc., and an optimal sample for gas analysis. A thin disk-shaped sample having a thickness of about 2 to 4 mm can be obtained at the same time. That is, a thick molten metal sample is
The surface is lightly polished to obtain an analysis sample for emission spectroscopy, and the thin sample is punched to obtain an analysis sample for C / S / N gas analysis. Furthermore, if the surface of the sample mold forming the hollow portion is formed to be smooth, the analysis surface can be easily polished, and the preparation of the analysis sample performed after the sampling of the molten metal can be performed in a shorter time. As a result, a reduction in the time required for the analysis and a reduction in labor are achieved, and a quick analysis is possible.

Further, the sample mold used in the present invention is provided with a small hole for degassing at the upper part, and when the molten metal is pushed into the hollow part from the sample inlet, the hollow part of the sample mold is formed. The gas such as air is exhausted from the small holes, and then quickly exhausted from a sufficiently large gas permeable portion provided between the inner wall of the outer cylinder and the outer wall of the holding cylinder. This gas vent hole is used when the molten metal is pushed into the sample mold from the sample introduction part, and if the gas such as air that is displaced with the molten metal and pushed out to the outside is smoothly exhausted. The shape, the number, the position, and the like are not limited.

The molten metal sampling apparatus of the present invention having the above-described structure can achieve a good exhaust balance even when sampling is performed in a shallow portion of the molten metal bath, and can achieve the above-described small holes for degassing. The gas such as air pushed out from the air is quickly exhausted to the outside through the gas permeable portion formed between the inner wall of the outer cylinder and the outer wall of the holding cylinder without causing exhaust failure. As a result, the problem of insufficient filling of the molten metal sample, which is considered to be caused by the exhaust failure caused by the conventional apparatus shown in FIG.
With a probability of 0%, a good sample of the molten metal can be obtained. Furthermore, in the molten metal sampling device of the present invention, as described above, since the end of the sample type of the holding cylinder is completely sealed, a temperature measurement system is used for sampling, Even when the molten metal sampling device of the present invention is mounted on the tip of the temperature measuring lance, exhaust gas cannot be applied to the contact point of the cable exposed at the tip of the temperature measuring lance, It is possible to completely prevent the contacts from being contaminated by the droplets. As a result, unlike the related art, the durability of the temperature measuring lance used for sampling does not deteriorate.

[0029]

The present invention will be described below in more detail with reference to examples and comparative examples. <Embodiment 1> Using the molten metal sampling apparatus having the structure shown in FIG. 1, it was attached to the tip of a consumable immersion thermocouple holder manufactured by Nissub Co., Ltd. to integrate it into the state shown in FIG. 100 molten metal samples were sampled from predetermined positions where the position in the molten metal bath to be sampled was changed stepwise within the range of 200 to 1,000 mm in the depth direction of the molten metal bath. At this time, a lollipop type was used as the sample type. Between the inner wall of the outer cylinder and the outer wall of the holding cylinder,
A paper spacer having a thickness of 3.5 mm was provided, and a gas permeable portion having a width of 14 mm was formed along the outer wall of the holding cylinder. A paper tube made of cardboard having a thickness of 5 mm was used for the outer tube and the holding tube. Fig. 1
A ceramic mold member having a sectional shape as shown in FIG. A part of a quartz tube having a diameter of 9 mm was inserted into the sample introduction part of the sample type, and one end of the quartz tube was protruded outside a length of about 15 mm. A 0.1 mm-thick iron cap was provided at the end opening of the quartz tube protruding outside, and a 0.25 mm-thick outer protective cap was further provided thereon. In addition, gypsum was packed in a thickness of about 10 mm in the opening at the tip of the holding cylinder on the sample type side and sealed.

The 100 lollipop-type samples obtained as a result were all good and sufficiently filled with the molten metal, regardless of the position in the depth direction in the molten metal bath. Also, after 100 samples have been sampled,
The tip of the lance for temperature measurement on the side that had been inserted into the holding cylinder was carefully observed with a magnifying glass, but no splash of molten metal was observed in any case.

<Comparative Example 1> The procedure of Example 1 was repeated, except that a molten metal sampling apparatus having the structure shown in FIG. 3 was used.
The temperature measuring lance used in Example 1 was attached to the tip of the lance to be integrated, and the position in the molten metal bath at which the sample was collected was 200 to 200 in the depth direction of the molten metal bath in the same manner as in Example 1.
Ten molten metal samples were sampled from predetermined positions changed stepwise within a range of 1,000 mm. As a result, some of the obtained ten samples were found to be underfilled with some molten metal. In particular, when the sample was collected from a shallow portion of the molten metal bath, specifically, a sample collected from a depth of 200 to 400 mm showed a remarkable underfilling phenomenon. After the sampling of 10 tubes was completed, the tip of the lance for temperature measurement that had been inserted into the holding tube was carefully observed with a magnifying glass, as in Example 1. Was observed.

[0032]

According to the present invention, in particular, the influence on the position where the sample mold is immersed, which is suitable when the conventional temperature measuring system is used and the molten metal is sampled independently from the temperature measuring operation. Provided is a molten metal sampling device capable of performing stable sampling in a good state without receiving the sample. Further, according to the present invention, in particular, there is provided a molten metal sampling apparatus and a molten metal sample sampling method which enable automatic sampling by using a conventional temperature measuring system. Further, according to the present invention, when sampling is performed using a conventional temperature measurement system,
Provided are a molten metal sampling device and a method for sampling a molten metal sample that do not stain exposed cable contacts and do not impair the durability of a temperature measuring system to be used. Further, according to the present invention, a molten metal sample collection device capable of contributing to stably perform daily process management and product management in a steel making process and the like by enabling rapid analysis of molten metal, and A method for sampling a metal sample is provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one example of a molten metal sampling device of the present invention.

FIG. 2 is a schematic sectional view showing a state in which the molten metal sampling device of the present invention is mounted on the tip of a temperature measuring lance.

FIG. 3 is a schematic view showing a conventional molten metal sampling device.

FIG. 4 is a schematic view showing an instrument used in a temperature measurement system used in the method for sampling a molten metal sample according to the present invention.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C21C 5/52 C21C 5/52 7/00 7/00 R C22B 9/02 C22B 9/02 (72) Invention Person Hideyoshi Egoshi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Ichihiro Yamaguchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kiichi Hahara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Tatsuo Aisaka 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Kazuto Kawashima Toshi 1-21-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Katsuo Mihori 4-13-7 Tsurumichuo, Tsurumi-ku, Yokohama-shi, Kanagawa In-house (72) Inventor Masaaki Shimura 4-13-7 Tsurumi Chuo, Tsurumi-ku, Yokohama, Kanagawa Prefecture Inside Electronic Rika Kogyo Co., Ltd. (72) Inventor Isamu 4-13-7 Tsurumi Chuo, Tsurumi-ku, Yokohama, Kanagawa Prefecture F term in Industrial Co., Ltd. (reference) 2G055 AA21 DA02 DA31 4K001 GB11 4K002 CA03 4K013 FA02 4K014 AD17 CD11

Claims (5)

[Claims] 1. A sample mold and an outer cylinder for holding the sample mold, and a sample mold and an outer cylinder partially held inside the outer cylinder for holding and transporting the sample mold and the outer cylinder in a molten metal. In a molten metal sampling device having at least a holding cylinder,
The sample mold has a hollow portion filled with the molten metal in at least an arbitrary shape, a sample introduction portion for guiding the molten metal to the hollow portion, and a small hole for degassing. The hollow portion between the inner wall of the outer tube and the outer wall of the holding tube is sealed at the tip of the side inserted therein, and the portion inserted into the outer tube of the holding tube. An apparatus for collecting a sample of molten metal, comprising a gas permeable portion for exhausting gas from the apparatus. 2. A gas permeable portion is provided between the inner wall of the outer cylinder and the outer wall of the holding cylinder, and a gap formed by a spacer provided between the inner wall of the outer cylinder and the outer wall of the holding cylinder. 2. A hole of a hollow pipe embedded in the filling member, and / or a continuous through hole of a filling member provided between an inner wall of the outer cylinder and an outer wall of the holding cylinder. 3. The apparatus for collecting molten metal according to claim 1. 3. The outer cylinder has at least a two-layer structure, a layer constituting an inner wall is made of paper, and the outermost layer is made of a material selected from a heat-resistant ceramic, diatomaceous earth, and high-earth soil. The apparatus for collecting a sample of a molten metal according to claim 1 or 2. 4. The melting apparatus according to claim 1, wherein a ceramic mold member for fixing and holding the sample mold in the outer cylinder is fitted into an opening at one end of the outer cylinder. Metal sampling equipment. 5. A method for sampling a molten metal sample, comprising: immersing a molten metal sampling device in a molten metal bath, and forcing the molten metal into a hollow portion of a sample mold to collect a molten sample. The molten metal sampler according to any one of the preceding claims, and a controllable temperature measuring system used for the molten metal, wherein the tip of a temperature measuring lance used in the temperature measuring system is a sample of the molten metal. A method for sampling a molten metal sample, comprising inserting the molten metal sample into a holding tube of a sampling device and attaching a molten metal sample collection device to the tip of a temperature measuring lance.