JPH019005Y2 - - Google Patents

Description

[Detailed description of the invention] This invention cools and solidifies the pig iron relatively quickly in a tubular device that collects samples by immersing it in a molten pig iron bath charged in a melting furnace, ladle, etc., and liberates all the carbon contained. It is configured to collect a sample (specimen) that has a white pig iron structure without existing as graphite and has dimensions that can be easily used for measuring the component composition, and is configured to simultaneously measure the temperature of the hot metal. This invention relates to a sampler for collecting samples.

It is well known that pig iron and cast iron containing large amounts of carbon and silicon are sampled from a molten bath, and specimens are prepared to chemically analyze and measure the composition of carbon, silicon, etc. contained therein. However, such conventional methods have various drawbacks, such as being time consuming and requiring various materials, equipment, and complicated means. However, in recent years, methods have been implemented to measure components and their contents by spectroscopy, making use of the differences in the wavelengths of spectral lines emitted by different elements and the differences in the sensitivity of the generated spectral lines depending on the content.

Therefore, when measuring the content of components such as carbon in pig iron (cast iron) using such spectroscopy, it is necessary to measure the amount of carbon contained in pig iron (cast iron). In some cases, it is difficult to measure the amount of carbon contained, and therefore it is advantageous that the carbon contained in the sample used in such a method does not exist as graphite, but exists entirely as compound carbon (Fe ₃ C). be. That is, the pig iron (cast iron) is assumed to exhibit a white pig iron (white cast iron) structure, and when using such specimens and using a specific spectroscopic method, it is possible to determine the component composition particularly quickly and with high precision.

Conventionally, samplers that meet the above conditions have used a large amount of cold hardening iron, steel, or copper for the runners and molds (Special Publication No. 49-27069), making it difficult to remove the solidified sample from the sample chamber. It is difficult and expensive, requires extra work such as cleaning for repeated use, and is heavy and inconvenient to handle because it is made of metal.

In order to solve these deficiencies, the applicant first constructed a sump chamber using a porous and fire-resistant material such as shell sand, and lined the side wall surface of the sump chamber with a carbide stabilizer (Te, etc.). He proposed a sampler that could be used in various ways and was patented (Special Publication No. 53-38638).

The present inventor improved these conventional techniques and used foundry sand such as zirconside and chromite sand, which has the same cold-hardening effect as metal, and it is easy to take out specimens, and specimens with white pig iron structure are collected. I found out that it is possible.

The present invention relates to a sample collecting device for collecting a specimen to be measured using a well-known Quantovac device when measuring the carbon content of pig iron (cast iron) using the above-mentioned spectroscopic method. The specimens used to analyze pig iron (cast iron) using this type of spectroscopy are hard and brittle, exhibiting a white cast iron structure as described above, so specimens of appropriate size must be created by large-scale machining. Therefore, in the present invention, we created a size that can be used immediately by polishing with a very small amount of paper, etc., and has a uniform and completely white pig iron (white cast iron) structure, and does not contain even the slightest amount of free graphite. It is suitable for obtaining specimens that do not have In addition, when collecting the sample, in order to prevent the slag located at the top of the molten metal from being mixed in and to collect the true molten metal, the sample is collected by immersing it in the molten metal, for example, about 350 mm into the molten metal in a ladle.

In the present invention, a temperature measuring device is further attached to the tip of the sample collecting device at the same time as the sample is collected as described above, and the thermocouple attached to this device is connected to the thermometer. The device is constructed so that it can also measure the true temperature of the molten metal.

The configuration and effects of the present invention will be explained in detail based on the accompanying drawings showing a specific example of the sampler of the present invention.

The attached drawing is a longitudinal sectional view of an example of the sampler of the present invention, and numeral 10 is a long paper tube commonly used in this kind of sampler, and the center of the tip of the paper tube 10 has a cooling molded with molding sand or the like. A hard runner agent 5 is arranged as shown in the figure. The runner agent 5 for cooling and hardening includes a sprue 8, a runner 5' communicating with the sprue 8, and a gas vent hole 6. Reference numeral 2 is a sample type, which has a U-shaped axial cross section, and a sample chamber 3 on one end face is arranged so as to communicate with the runner 5'. Reference numeral 4 denotes a heat insulating plate, for example a ceramic plate, which is disposed on the other end surface of the sample mold 2 as shown in the figure. Reference numeral 7 denotes a permeable ceramic plate, which is arranged to cover the end face of the gas vent hole 6 to allow gas generated during sample collection to easily pass therethrough, thereby preventing contamination of the collected sample by the generated gas. Reference numeral 9 denotes a sprue closing material, which is made of a paper cap or the like, and is easily opened after passing through the slag layer when immersed in the molten metal.
The structure is designed to prevent contamination of the runner, sample chamber, etc. before use. In addition to ceramic, paper (cardboard), heat-resistant organic material, etc. can also be used for the heat insulating plate.

In addition, in the sampler of the present invention, as mentioned above, the temperature sensor 1 has a built-in thermocouple at the tip of the paper tube 10.
As shown in the figure, the thermocouple is connected to a thermometer (not shown) via a compensating conductor 11 and an intermediate connector 12, so that the temperature of the molten metal can be measured at the same time as sampling.

The sampler of the present invention has the above-mentioned configuration,
Therefore, a sample having a uniform and completely white pig iron structure, uncontaminated, and of an appropriate size as an analysis specimen can be collected without requiring any skill, and the temperature of the molten metal at the time of sample collection can be accurately measured. The practical effects that can be achieved are great.

[Brief explanation of the drawing]

The attached drawing is a partial sectional view showing an example of the sampler of the present invention, and in the drawing, 1 is a temperature sensor, 2 is a sample type, 3 is a sample chamber, 4 is a heat insulating plate, 5 is a cold hardening runner, 5' is a runner, 6 is a gas vent hole, 7 is a gas permeable member, 8 is a sprue, 9 is a sprue closing material, 1
0 is a paper tube, 11 is a compensation conductor, and 12 is an intermediate connector.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A casting of zircon sand, chromite sand, etc., which has a sprue 8, a runner 5', and a gas vent hole 6 in the center of the tip of a long body made of a paper tube 10 or the like. A shaft in which a cold hardening runner 5 made of sand is disposed, a sample chamber 3 communicating with the runner 5' is provided at the tip of the runner 5, and a heat insulating plate 4 is disposed on the back side. A sampler for collecting a sample of white pig iron structure by immersing it in hot metal, which is equipped with a sample mold 2 having a U-shaped directional cross section and a gas permeable member 7 on the end face of a gas vent hole 6. (2) A sampler for collecting a sample of white pig iron tissue by immersing it in hot metal according to claim 1, wherein a temperature sensor 1 connected to a compensating conductor 11 is disposed at the tip of the sampler. (3) A sampler for collecting a sample of white pig iron structure by immersing it in hot metal according to claim 1 or 2 of the utility model registration claim, in which the sprue 8 is closed with a sprue plugging material 9.