JPH0651868U - Molten metal sampler - Google Patents

Abstract

(57) [Summary] [Purpose] Sampling molten metal at an arbitrary position in the molten metal bath without any analytical error. In a sampling device for collecting molten metal at an arbitrary position in a molten metal bath, a metal rod 1 and the metal rod 1
The sample container 2 has a sampling port fixed to the tip end thereof and sealed with a graphite sheet 3, and a piercing rod 9 guided by a guide ring 8 provided at a predetermined interval on the metal rod 1 to hit the graphite sheet 3. [Effect] An accurate molten metal sample at an arbitrary position in the molten metal bath can be collected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to an apparatus for sampling molten metal in a molten metal bath of a molten metal plating line.

[0002]

[Prior art]

 For example, in a hot-dip galvanizing line, iron elutes from a strip that passes through a hot-dip galvanizing bath or from a dipped roll to form a hot-dip galvanized metal and an intermetallic compound, which results in bottom dross and hot-dip galvanizing. Precipitates in a metal bath. Alternatively, when the plated metal pulled up by the strip is returned to the bath, air-oxidized mud-like substances and iron- and aluminum-based metal compounds are produced and float on the bath surface as top dross. In order to operate under proper conditions in a hot-dip galvanizing line, it is necessary to know the exact components of the hot-dip galvanizing bath, especially the concentrations of Fe and Al.

Conventionally, as a method of collecting a sample of molten metal, a method of pumping and solidifying by a ladle is used, or, as shown in FIG. 4, a sampling port of a sample container 22 attached to the tip of a rod 21 called a bomb method is used. The metal plate (copper in the case of molten steel) or a flammable substance (cardboard, etc.) is used for sealing, and the sample container 22 of the rod 21 is dipped to the sampling position in the molten metal, and the lid is closed. There is one in which the body 23 melts or disappears so that the molten metal at the intended position enters the sample container 22.

[0004]

[Problems to be solved by the device]

 When the top dross floats on the surface of the hot dip metal bath, it is not possible to accurately measure the components in the hot bath when the top dross floats on the surface of the hot dip metal bath and the composition of the hot dip metal bath cannot be accurately measured. Can be sampled, but sampling at any position in the depth direction is impossible. In the bomb method, when a soluble metal plate is used as the lid, for example, when a copper plate is used as the lid of the sample container, the melting point of the copper plate is 1083 ° C, so the copper plate melts in molten steel (melting point 1600 ° C). The molten steel then flows into the sample container and can be sampled. However, when the melting point of the molten metal is lower than that of the soluble metal of the lid, for example, when a copper plate is used as the lid of the sample container, it cannot be used in the case of a molten zinc bath having a melting point lower than that of copper. Furthermore, the soluble metal of the lid itself may cause an analytical error, which is not desirable.

Further, when a combustible substance is used as the lid, not only the molten metal is bumped due to the rapid combustion of the combustible substance, but also the smoke is so bad that it cannot be used in a place without a smoke exhaust facility. In addition, the rapid combustion of flammable substances causes agitation of the molten metal bath, and if there is floating top dross or sedimentation of bottom dross as in the case of molten plating metal bath, these are involved and accurate plating bath components are measured. Can not. Furthermore, if you want to know the components of the plating bath near the strip, the method of stirring the molten plating metal bath causes the above-mentioned dross to adhere to the strip, which poses the problem that sampling during operation cannot be performed. There is.

An object of the present invention is to provide a molten metal sampling / collecting device capable of sampling the molten metal at an arbitrary position in the molten metal bath and causing no analysis error.

[0007]

[Means for Solving the Problems]

 The present inventors repeated various examination tests in order to achieve the above-mentioned object. As a result, the sampling port of the sample container fixed to the tip of the metal rod was sealed with a graphite sheet, and the melted plating was performed with a piercing rod such as a rebar guided along a guide provided at a predetermined interval on the metal rod. By piercing the graphite sheet of the sample container immersed in a predetermined position of the metal bath, it was clarified that the galvanized metal at an arbitrary position could be sampled without causing an analysis error, and the present invention was reached.

That is, the present invention relates to a sampling device for collecting molten metal at an arbitrary position in a molten metal bath, a metal rod, and a sample container in which a collection port fixed to the tip of the metal rod is sealed with a graphite sheet. A sampler for collecting molten metal, comprising: a piercing bar which is guided by guide rings provided at predetermined intervals on the metal rod and hits a graphite sheet.

[0009]

[Action]

 In the sample collecting device of the present invention, a sample container whose collection port is sealed with a graphite sheet is fixed to the tip of a metal rod, and a guide ring provided at a predetermined interval on the metal rod guides the sample sheet to rebar such as rebar. Since a piercing rod is provided, the sample container at the tip of the metal rod is immersed in an arbitrary position in the molten metal bath, and the graphite sheet that seals the sampling port of the sample container is pierced by the piercing rod, and then the piercing rod is pulled out to collect the sample. A hole is drilled in the mouth, and molten metal flows into and fills the sample container. Therefore, the molten metal at any position can be sampled by pulling up the metal rod as it is.

In this invention, the graphite sheet is used to seal the sampling port of the sample container because the melting point of the graphite sheet is extremely high at 3550 ° C. and it is stable in a non-oxidizing atmosphere. It does not melt and does not affect the accuracy of component analysis, and it does not burn when sampling, unlike flammable substances, so it can be used even in the absence of smoke exhaust equipment and does not stir the molten metal bath. . Further, since the graphite sheet is pierced by a piercing rod and pierced at the sampling port, it is possible to sample a molten metal having a low melting point such as molten zinc in a molten zinc bath of a continuous galvanizing line.

The thickness of the graphite sheet used to seal the sampling port of the sample container can be easily pierced by being pierced with a piercing rod, and the air inside the container can be expanded when the sample container is immersed in the molten metal bath. It is necessary to satisfy the condition that it will not be damaged by the external pressure received in the bath. These conditions may be appropriately selected because they vary depending on the use conditions. For example, in order to sample molten zinc at a depth of 1.5 m in a molten zinc bath at 460 ° C., empirically, a graphite sheet is used. Since a thickness of 2 mm or more is required, about 2 to 4 mm is appropriate. In addition, since a thin graphite sheet is easier to manufacture and easier to process, it is more practical to stack three 1 mm-thick graphite sheets in order to secure a thickness of 3 mm.

[0012] The sampling port of the sample container is sealed with the graphite sheet because the molten metal does not enter when immersed in the molten metal bath, and the graphite sheet is expanded by the expansion of the air in the container during the immersion and the external pressure received in the bath. Any structure may be used as long as it does not slip off. For example, a structure in which a pressing ring having protrusions facing the upper and lower inner surfaces is welded around the sampling port of the sample container, and the protrusions of the pressing ring are bite into the graphite sheet is recommended.

[0013]

【Example】

 The details of the present invention will be described below with reference to FIGS. FIG. 1 is an overall structural view of a molten metal sampler of the present invention, FIG. 2 is a vertical cross-sectional view of a sample container, and FIG. 3 shows an expansion state of air in the container when the sample container is immersed in a molten metal bath. FIG. 1 to 2, 1 is a metal rod, 2 is a sample container in which two end portions of the metal rod 1 are fixed at intervals, and 3 is a three-layer black lead sheet that seals the sampling port of the sample container 2. In the graphite sheet 3, the lower surface of the lower pressing ring 4 is welded around the sampling port of the sample container 2, and the protrusions 6 facing the upper pressing ring 5 are bitten into the graphite sheet 3 to be hermetically fixed by the welding portion 7. .

Reference numeral 8 is a guide ring provided on the metal rod 1 at a predetermined interval, and a piercing bar 9 having a bifurcated lower part and having substantially the same length as the metal rod 1 is inserted into the guide ring 8 to form a sample. Guide the graphite sheets 3 on the upper surfaces of the containers 2 and 2 so as to accurately hit them. The piercing bar 9 which is bifurcated at the lower side is accurately guided to the graphite sheet 3 on the upper surfaces of the sample containers 2 and 2 by lowering it along the guide ring 8. It is configured to break through. Further, as shown in FIG. 3, the graphite sheet 3 has upper and lower protrusions 6, 6 biting into it so as not to slip out from between the pressing rings 4 and 5 due to expansion of air in the sample container 2 when immersed in the molten metal bath. I'm out.

With the above configuration, when collecting a sample of molten metal, the metal rod 1 is operated to immerse the sample containers 2 and 2 at an arbitrary position in the molten metal bath, and then the piercing rod 9 is inserted. After descending along the guide ring 8 and piercing the graphite sheet 3 at its lower end and breaking it, the piercing bar 9 is raised along the guide ring 8 to form sampling holes in the graphite sheet 3 and to perforate molten metal. The sample holes 2 and 2 are filled from the sampling holes. Therefore, if the metal rod 1 is operated and pulled up as it is, the molten metal at an arbitrary position in the molten metal bath can be sampled.

The sample container 2 of the above-mentioned molten metal sampling device is immersed in a molten zinc bath of a continuous galvanizing line at a depth of 1 m from the bath surface and then pulled up as it is. It was confirmed that zinc did not penetrate. In addition, the hot-dip zinc was sampled at a depth of 1 m from the bath surface of the hot-dip galvanizing bath of the continuous hot-dip galvanizing line by each of the bomb method using cardboard for sealing the device and the sample container. Then, the sampling accuracy was compared. The sampling accuracy was compared by the high Fe concentration in the molten zinc bath, that is, the presence or absence of inclusion of dross (Fe—Zn—Al-based intermetallic compound). The results are shown in Table 1. It was found that the device of the present invention has a low Fe concentration (dross amount) and has a small amount of dross entrainment. The bomb method not only had a problem in safety work due to bumping due to the burning of cardboard, but also had poor sampling accuracy.

[0017]

[Table 1]

[0018]

[Effect of device]

 As described above, according to the sampling device of the present invention, it is possible to collect a sample of the molten metal at an exact position in the molten metal bath.

[Brief description of drawings]

FIG. 1 is an overall structural view of a molten metal sampling device of the present invention.

FIG. 2 is a vertical sectional view of the sample container of the present invention.

FIG. 3 is a partially enlarged view showing the expansion state of air in the sample container of the present invention when the sample container is immersed in a molten metal bath.

FIG. 4 is an overall structural view of a conventional molten metal sampler for a bomb method.

[Explanation of symbols]

 1 Metal Rod 2, 22 Sample Container 3 Graphite Sheet 4 Lower Pressing Ring 5 Upper Holding Ring 6 Protrusion 7 Welding Part 8 Guide Ring 9 Stab Bar 21 Bar 23 Lid

Claims (1)

[Scope of utility model registration request] 1. A sampling device for sampling molten metal at an arbitrary position in a molten metal bath, a metal rod, a sample container in which a sampling port fixed to the tip of the metal rod is sealed with a graphite sheet, and the metal rod. A sampler for collecting molten metal, which comprises a piercing bar which is guided by a guide ring provided at a predetermined interval to hit a graphite sheet.