JPH06265539A - Lower injection molten metal sampler - Google Patents

Abstract

PURPOSE:To obtain a sound solidified sample by forming a restricting part having small diameter opposing to a flow-in port and an enlarged part having large diameter opposing to a sampling chamber in an introduction pipe and controlling the flow-in speed of molten metal thereby preventing the molten metal from clogging a vent hole or overflowing. CONSTITUTION:A restricting part 21 having small diameter opposing to a flow-in opening 6 and an enlarged part 22 having large diameter opposing to the sampling chamber 8 of a sampler 4 are formed in an introduction pipe 5. Inner diameters (d) and D at the restricting part 21 and the enlarging part 22 are preferably set to satisfy a relationship; d/D=1/2-1/10. A probe body 1 is immersed into a molten metal injected through the opening 6. In this regard, flow rate of molten metal is limited at the restricting part 21 and the current velocity is lowered at the enlarged part 22. Current velocity is also lowered by bending the joint of the restricting part 21 and the enlarging part 22. Since jet or turbulence of molten metal does not clog a vent hole made at an upper part of the sampler 4 nor the molten metal flow over the vent hole, a sound solidified sample can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submersion type molten metal sampler for injecting molten metal from below and filling and solidifying it in a sampler located above when collecting molten metal such as molten steel.

[0002]

2. Description of the Related Art A conventional submersible molten metal sampling device is
As shown in FIG. 4, a cylindrical paper tube probe main body 1 with its tip facing downward is formed, and a holding member 2 made of a molded product such as a shell mold and a paper tube installed in the tip portion of the probe main body 1. And a plug body 3 formed of a molded product such as a shell mold and ceramics inserted at the tip of the probe body 1.
The sampler 4 is housed through the sampler 4, and the introduction pipe 5 is extended below the sampler 4.

The introduction pipe 5 is made of a heat-resistant and heat-resistant pipe such as a quartz pipe or a ceramic pipe, and has an inflow opening 6 at the lower end of the lower part protruding downward from the plug body 3.
The inflow opening 6 is covered with a cap 7 made of a thin steel plate or the like.

The sampler 4 constitutes a sampling container which forms a sampling chamber 8 which communicates with the upper portion of the introduction tube 5, and is located at the upper portion and has a gas vent hole 9 for communicating the inside and outside of the sampling chamber 8 with each other. Is provided. In the illustrated case, the sampler 4 is configured by abutting a container made of a metal such as a half-divided steel, which is a shallow bottom, for collecting a substantially flat disk-shaped sample in the sample collection chamber 8, It is provided with a sleeve 10 for inserting and connecting the upper part of 5.

Therefore, when the metal sample is sampled by the submersible molten metal sampler, the probe body 1 is
It is immersed in the molten metal by the immersion device. When the probe body 1 passes through the slag layer and sinks to a predetermined position in the molten metal bath, the cap 7 is lost to open the inflow opening 6, and the molten metal is allowed to flow into the introduction pipe 5 from the inflow opening 6. As a result, the sample collection chamber 8 of the sampler 4 is filled with the molten metal, and the molten metal is solidified there to form a sample to be collected. After pulling up the probe body 1 from the molten metal, the sample to be sampled is taken out from the sampler 4 and subjected to sample analysis such as emission spectroscopy analysis and combustion analysis.

[0006]

In the above-mentioned conventional submersible molten metal sampler, as soon as the inflow opening 6 is opened, the molten metal is vigorously flowed into the introduction pipe 5 and into the sample collection chamber 8. It is injected with jets and turbulence.

[0007] Such a vigorous inflow tends to be considered preferable in order to completely fill the sampling chamber 8 with the molten metal, but according to the experiments by the present inventors, a serious problem occurs. It was discovered that there is.

That is, when the molten metal is vigorously circulated through the introduction pipe 5 and is injected into the sampling chamber 8 with a jet flow or a turbulent flow, the molten metal scattered in the sampling chamber 8 is released from the gas vent hole 9. On the gas vent hole 9 to close the gas vent hole 9 at an early stage. Since the sampler 4 is made of a metal such as steel for the purpose of solidifying the molten metal, when the molten metal is scattered toward the gas vent hole 9, the sampler 4 is solidified there and closes the gas vent hole 9. Will end up.

When the gas vent hole 9 is closed early in this way, the gas in the sampling chamber 8 cannot be discharged properly thereafter, and as a result, the sampling chamber 8 is filled with the gas. There is a problem in that residual air is entrained in the molten metal to form cavities in the solidified sample, and a sound solidified sample cannot be collected.

Regarding this point, in the past, in order to control the inflow velocity of the molten metal toward the sampling chamber 8, the size and the number of the gas vent holes 9 were set at the time of designing the sampler, but in this case, , It was found that there are the following problems.

That is, when the gas vent hole 9 is enlarged, the molten metal filled in the sampling chamber 8 overflows from the gas vent hole 9 and forms an unnecessary solidified metal in the state of overflowing the outside of the sampler 4. Since this unnecessary solidified metal is connected to the solidified sample in the sampling chamber 8 through the gas vent hole 9, it becomes extremely difficult to take the solidified sample out of the sampler 4 after the sampling operation.

On the other hand, when the gas vent holes 9 are formed small so that the molten metal does not overflow and a plurality of gas vent holes 9 are provided, the gas vent holes are closed relatively early and the sampler 4 is processed. There are problems such as high cost.

[0013]

In order to solve the above-mentioned problems, the present invention provides a subcontracting method for controlling the inflow rate of molten metal toward a sampling chamber so that the control can be performed at a portion of an introduction pipe. The present invention provides a molten metal sampling device, which is configured as a first means thereof.
Introducing a heat-resistant and heat-insulating pipe for injecting molten metal from an inflow opening in the lower part, and a sampling chamber for filling and solidifying the molten metal communicated with the upper part of the introductory pipe, and a gas vent hole in the sampling chamber In the injecting molten metal sampling device, which comprises a sampler in which the sampler is formed, a small-diameter squeezing portion facing the inflow opening and a large-diameter expanding portion facing the sampling chamber of the sampler inside the introducing pipe It is in the point that formed and.

In the embodiment of the present invention, it is preferable that the inner diameter of the throttle portion is within a range of 1/2 to 1/10 of the inner diameter of the expansion portion.

Further, in the embodiment of the present invention, it is preferable that a diameter-expanded taper portion is formed between the narrowed portion and the expansion portion. At this time, the taper angle of the diameter-expansion taper portion with respect to the axis is set to 5 degrees or more. Preferably.

Further, the present invention is configured as the second means, in which the introduction pipe having heat-resistant and heat-retaining properties for allowing the molten metal to flow in from the lower inflow opening and the molten metal communicated with the upper part of the introduction pipe are filled. In a down-flowing molten metal sampler comprising a sample-collecting chamber for solidification and a sampler having a gas vent hole in the sample-collecting chamber, a diameter facing an inflow opening inside the introducing pipe. The point is that a large introduction part, a large-diameter expansion part facing the sample collection chamber of the sampler, and a small-diameter narrowed part arranged between the introduction part and the expansion part are formed.

In an embodiment of the present invention, a tapered taper portion is formed between the introduction portion and the throttle portion, and a tapered taper portion is formed between the throttle portion and the expanded portion, and the orifice portion is formed by the throttle portion. It is preferable to configure.

Further, the third aspect of the present invention is that the molten metal flow path of the introduction pipe is bent by disposing the axes of the narrowed portion and the expanded portion so as to be offset from each other. It is in.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings. The feature of the present invention lies in the shape of the introduction tube, and the structure of the probe main body and the structure of the sampler are the same as those of the conventional ones. Since it is similar to the example, similar components are shown in FIG.
The same reference numerals as in FIG.

(First Embodiment) In the first embodiment shown in FIG. 1, a small diameter portion 21 facing the inflow opening 6 and a diameter facing the sampling chamber 8 of the sampler 4 are provided inside the introducing pipe 5. A large expansion portion 22 is formed.

That is, the inner diameter d of the narrowed portion 21 and the expanded portion 22
Has an inner diameter D of d <D, preferably d / D =
It is formed in 1/2 to 1/10.

The narrowed portion 21 and the expanded portion 22 are arranged with their axes deviated from each other so that the molten metal flow path of the introduction pipe 5 is bent. In the case of the example shown in FIG.
The axis of 2 is arranged parallel to the axis of the probe main body 1, while the axis of the narrowed portion 21 intersects the axis of the expanded portion 22 at right angles, and the narrowed portion 21 and the inflow opening 6 are arranged on the side of the expanded portion 22. is doing.

In the first embodiment, the shape and arrangement of the throttle portion 21 can be configured in various ways. For example, in the first example shown in FIG. 1A, the narrowed portion 21 is made to project to the side portion of the expansion portion 22.

Further, in the second example shown in FIG. 1B, the narrowed portion 21 is formed inward from the tip side portion of the expansion portion 22.

Further, in the third example shown in FIG. 1C, the throttle portion 21 is formed inward from the side portion at a position slightly retracted from the tip of the expansion portion 22.

Therefore, according to the first embodiment, when the molten metal flows in through the inflow opening 6, the flow rate of the molten metal is limited by the throttle portion 21 and is expanded by the expansion portion 22. , The flow velocity can be reduced.
Further, since the axis of the narrowed portion 21 and the expanded portion 22 are deviated to form a bent flow path, a loss of flow velocity energy due to a curved flow is caused, and from this point also the flow velocity of the molten metal is reduced. To be

Therefore, the molten metal flowing into the sample collecting chamber 8 of the sampler 4 is not scattered in the sample collecting chamber 8 with a jet flow or a turbulent flow as in the conventional case, and the flow velocity is appropriately controlled. The sampling chamber 8 is filled under various flow rates.

(Second Embodiment) In the second embodiment shown in FIG. 2, the introduction pipe 5 has a small diameter portion 21 facing the inflow opening 6 and a diameter facing the sampling chamber 8 of the sampler 4 inside. A large expanded portion 22 is formed, and the axis of the narrowed portion 21 and the axis of the expanded portion 22 are arranged coaxially and straight.

The inner diameter d of the narrowed portion 21 and the inner diameter D of the expanded portion 22 are formed such that d <D, preferably d / D = 1.
/ 2 to 1/10.

Also in this second embodiment, various embodiments having different aspects can be constructed. For example, in the first example shown in FIG. An enlarged taper portion 23 is formed between them. The enlarged diameter tapered portion 23 preferably has a taper angle of 5 degrees or more with respect to the axis of the enlarged diameter tapered portion 23.

On the other hand, in the second example shown in FIG. 2B, a different diameter step portion 24 is formed between the narrowed portion 21 and the expanded portion 22.

Further, in the third example shown in FIG. 2 (C), an inward flange is formed at the tip of the introduction pipe 5 which entirely forms the expansion portion 22, and the inflow opening 6 itself having a small diameter is thereby formed. The diaphragm 21 is configured.

Although not shown, in the second embodiment, the molten metal passage may be bent by opening the inflow opening 6 to the side of the introduction pipe 5.

Therefore, according to the second embodiment, when the molten metal flows in from the inflow opening 6, the flow rate of the molten metal is limited by the throttle portion 21 and is expanded by the expansion portion 22. , The flow velocity can be reduced.
Therefore, the molten metal flowing into the sample collection chamber 8 of the sampler 4 is not scattered in the sample collection chamber 8 with a jet flow or turbulent flow as in the conventional case, and the flow velocity is controlled and an appropriate flow velocity is maintained. Below, the sampling chamber 8 is filled.

(Third Embodiment) In the third embodiment shown in FIG. 3, a large-diameter introducing portion 25 facing the inflow opening 6 and a diameter facing the sampling chamber 8 of the sampler 4 are provided inside the introducing pipe 5. A large expansion portion 22 and a small-diameter throttle portion 21 arranged between the introduction portion 25 and the extension portion 22 are formed, and the axis of the introduction portion 25, the axis of the throttle portion 21, and the axis of the extension portion 22 are coaxial. It is arranged straight above.

The inner diameter d of the narrowed portion 21 and the inner diameter D of the expanded portion 22 are formed so that d <D, preferably d / D = 1.
/ 2 to 1/10.

Also in the third embodiment, various embodiments having different forms can be constructed. For example, in the first example shown in FIG. A tapered taper portion 26 is formed therebetween, and an expanded taper portion 23 is formed between the narrowed portion 21 and the expanded portion 22, whereby the narrowed portion 21 constitutes an orifice. It is preferable that both the taper portion 26 and the taper portion 23 have a taper angle of 5 degrees or more with respect to the axes of the taper portions 26 and 23.

On the other hand, in the second example shown in FIG. 3B, different diameter step portions 27 and 24 are formed between the introducing portion 25 and the narrowing portion 21 and between the narrowing portion 21 and the expanding portion 22, respectively. There is.

Further, in the third example shown in FIG. 3C, a step of different diameter 27 is formed between the introduction portion 25 and the narrowed portion 21, while a diameter-expanded taper is formed between the narrowed portion 21 and the expanded portion 22. The part 23 is formed.

Further, in the fourth example shown in FIG. 3 (D), a tapered taper portion 26 is formed between the introduction portion 25 and the narrowed portion 21, while a different diameter step is formed between the narrowed portion 21 and the expanded portion 22. The part 24 is formed.

Although not shown, in the third embodiment, the molten metal flow path may be bent by opening the inflow opening 6 to the side portion of the introduction pipe 5.

Therefore, according to the third embodiment, when the molten metal flows in from the inflow opening 6, the molten metal is converged when the molten metal moves from the large-diameter introducing portion 25 to the narrowing portion 21, and the molten metal is converged. After the flow rate is limited by using the orifice 21 as the orifice, the flow is expanded in the expansion portion 22, so that the flow velocity can be reduced. Therefore, the molten metal flowing into the sample collection chamber 8 of the sampler 4 is not scattered in the sample collection chamber 8 with a jet flow or turbulent flow as in the conventional case, and the flow velocity is controlled and an appropriate flow velocity is maintained. Below sampling room 8
To be filled.

[0043]

According to the present invention as set forth in claims 1 to 3, since the inflow speed and the inflow rate of the molten metal are controlled by the throttle portion 21 and the expansion portion 22 of the introduction pipe 5, the sampler is passed through the introduction pipe 5. The molten metal flowing into the sampling chamber 8 of No. 4 is
It is preferably filled in the sampling chamber 8 without any jet flow or turbulent flow. Therefore, unlike the conventional case, the gas vent holes 9 of the sampler 4 are closed early by the scattering of the molten metal, and the residual air is not entrained in the collected sample that is filled and solidified in the sampling chamber 8, and the nest There is an effect that a sound sample with no noise can be collected.

According to the present invention as set forth in claims 4 and 5,
In addition to the above effects, since the introduction pipe 5 forms the narrowed portion 21 and the expanded portion 22 following the large-diametered introduced portion 25, the flow rate and flow rate of the molten metal can be reliably and easily controlled by using the narrowed portion 21 as an orifice. Therefore, there is an effect that the filling and sampling work of the molten metal by the sampling chamber 8 can be stabilized.

According to the sixth aspect of the present invention, in addition to the above structure, a bent molten metal flow path is formed by displacing the axes of the narrowed portion 21 and the expanded portion 22. The loss of flow velocity energy due to a curved flow is caused in the molten metal that has been generated, and since the flow velocity of the molten metal is controlled from this point, the intended purpose of collecting a healthy sample without burrs can be more reliably achieved. effective.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an essential part of a first embodiment of a submersion type molten metal sampling apparatus according to the present invention. Based on this first embodiment, (A) shows FIG. 3 is a longitudinal sectional view showing a first embodiment, (B) a second embodiment, and (C) a third embodiment.

FIG. 2 is a vertical cross-sectional view showing a main part of a second embodiment of a submersion type molten metal sampling apparatus according to the present invention. Based on this second embodiment, (A) shows FIG. 3 is a longitudinal sectional view showing a first embodiment, (B) a second embodiment, and (C) a third embodiment.

FIG. 3 is a vertical cross-sectional view showing an essential part of a third embodiment of a submersion type molten metal sampling apparatus according to the present invention. Based on the third embodiment, (A) shows 1st Example, (B) 2nd Example, (C) 3rd Example, (D)
[FIG. 7] is a vertical sectional view showing a fourth embodiment.

FIG. 4 is a vertical cross-sectional view showing a down-flowing type molten metal sampling device according to a conventional example.

[Explanation of symbols]

 1 Probe Main Body 4 Sampler 5 Inlet Pipe 6 Inlet Opening 8 Sampling Chamber 9 Gas Venting Hole 21 Throttling Part 22 Expanded Part 23 Expanded Tapered Part 24 Different Diameter Stepped Part 25 Introduced Part 26 Reduced Diameter Tapered Part 27 Different Diameter Stepped Part

Claims (6)

[Claims] 1. A sample-collecting chamber having a heat-resistant and heat-retaining property for allowing molten metal to flow in from a lower inflow opening and a sampling chamber for filling and solidifying the molten metal, which is communicated with the upper part of the introducing pipe, and the sampling is performed. In a submersion type molten metal sampler comprising a sampler having a gas vent hole in a chamber, a small-diameter throttle part facing the inflow opening is provided inside the introduction pipe, and a sampler chamber of the sampler. A submersion-type molten metal sampling device, characterized in that it comprises a large-diameter expanded portion. 2. The under-cast molten metal sampler according to claim 1, wherein the inner diameter of the narrowed portion is within the range of 1/2 to 1/10 with respect to the inner diameter of the expanded portion. . 3. A diameter-expanded taper portion is formed between the narrowed portion and the expansion portion, and the taper angle of the diameter-expansion taper portion with respect to the axis is set to 5 degrees or more. The above-mentioned submersible molten metal sampling device. 4. A sample collecting chamber is provided which has a heat-resistant and heat-retaining inlet pipe for allowing molten metal to flow in through a lower inlet opening and a sampling chamber for filling and solidifying the molten metal which is communicated with the upper portion of the inlet pipe. In a submersion type molten metal sampler comprising a sampler with a gas vent hole formed in a chamber, a large-diameter introduction part facing the inflow opening is provided inside the introduction pipe, and a sampler chamber of the sampler. A submersion-type molten metal sampling device comprising a large-diameter expanded part and a small-diameter narrowed part arranged between the introduction part and the expanded part. 5. A diameter-reduction taper portion is formed between the introduction portion and the throttle portion, and a diameter-expansion taper portion is formed between the throttle portion and the expansion portion, and the orifice portion is constituted by the throttle portion. The molten metal sampling device according to claim 4, wherein 6. The molten metal flow path of the introduction pipe is bent by arranging the axes of the narrowed portion and the expanded portion so as to be offset from each other. The submerged molten metal sampling device described in.