JPS5858029B2 - Molten metal sampling device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an apparatus for collecting a sample from molten metal.

It is well known to collect samples for analysis from a molten metal tank.

A device is used for this purpose, which comprises two half-bodies made of heat-resistant ceramic material with indentations for taking a sample of metal material.

The half-split bodies are assembled and connected using pipes.

The pipe is preferably made of paper and is used for operating the device and for immersing the device in a bath of molten metal.
Used to collect samples.

Devices of this kind can be found, for example, in German patent application no.
No. 519,957.

Generally, rod-shaped specimen bodies and disc-shaped specimen bodies can be obtained using this type of apparatus.

In particular, when taking samples from molten steel obtained from a converter, the unsettled molten steel in the sampling device must be pacified using a material that removes oxygen, preferably aluminum.

In addition, it is necessary that the sedative be very evenly distributed within the sample taken, in order to avoid erroneous results during later spectral analysis tests.

Known sampling devices are often unable to meet the high quality requirements demanded today.

The aim of the invention is to improve the sample taken, in particular with respect to its chemical homogeneity.

In order to achieve the above object, the present invention proposes a sample collection device as set forth in the claims.

By configuring the mixing chamber according to the invention, even if the sampling device is immersed in molten steel and is filled with molten steel for a short time, it will be possible to obtain disc-shaped as well as rod-shaped samples. It is possible to completely dissolve and evenly distribute the sedative in it.

The invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

The sampling device shown in FIG. 1 consists of a body 1 made of heat-resistant ceramic and made into a half-cylindrical shape.

The main body 1 can be inserted into the paper tube 3 up to an external annular stopper 2.

The inlet side flow path 6 is open to the outward facing front face 7 of the main body 1 .

The front face 7 of the main body 7 is protected by a known metal cap (not shown) that can be inserted over the portion of the main body 1 that protrudes from the paper tube.

The metal cap is made so that it melts down only after it is inserted through the slag floating on the molten metal, and the molten metal flows into the inlet channel 6.

The inlet side flow path is arranged obliquely and eccentrically with respect to the longitudinal axis of the main body 1 and communicates with the mixing chamber 9 .

The mixing chamber 9 is shaped like a disk or a sphere.

The mixing chamber 9 has an outlet side flow path 10 for collecting a rod-shaped sample.
It is connected to the recess 5 through the other end, and is also connected to the current recess 4 for making a disk-shaped sample.

The holes of the inlet side flow path 6 and the outlet side flow path 10 are provided side by side in the lower half of the mixing chamber 9 and are separated from each other by a projection 11 projecting into the mixing chamber 9.

Furthermore, a flow blocker 12 in the form of a protrusion is provided inside the mixing chamber 9 .

The recess 4 for the disc-shaped sample is provided with a vent hole 14 at its upper apex, and the vent hole 14 communicates with the inside of the pipe 3 .

Reference numeral 13 denotes an enlarged part provided in the inlet side flow path 6, and the enlarged part 1
3 is provided with sedatives.

The device of the present invention shown in FIG. 1 has an inlet side flow path 6 and an outlet side flow path 10 arranged side by side in the lower half of the mixing chamber 9. The molten metal rises along the round wall surface of the mixing chamber 9, descends, and reaches the exit side path 10 via the longest path.

Therefore, sufficient mixing with the sedative can be achieved, and a sample with chemically uniformity can be obtained.

Further, the above-mentioned effects are achieved by making the cross sections of the protrusion 11, the flow prevention body 12, and the mixing chamber 9 circular, and by the fact that the inlet side flow path 6 communicates with the mixing chamber 9 in a tangential manner and at an angle. encouraged.

In the embodiment shown in FIG. 2, elements that are equivalent to those in FIG. 1 are each labeled with an apostrophe.

The mixing chamber 9' is formed into a cylindrical shape, and is connected to the recess 5' through the outlet channel 10' for collecting a rod-shaped sample, and is connected to the recess 5' for preparing a disk-shaped sample. It is connected to the recess 4'.

The apparatus of the embodiment of FIG. 2 is constructed in such a way that the volume of the mixing chamber 9' is at least 1.5 times larger than the volume of the sampling chamber 4', and preferably up to 2 to 3 times larger.

Furthermore, the mixing chamber 9' is provided with a vent hole 15 at the highest position of the sample collection position.

Furthermore, the free passage cross section of the outlet side flow path 10' is reduced compared to that of the rod-shaped sample body 5'.

According to an advantageous embodiment of the invention, the molten metal passage section reduction section is
It can be constructed by an annular protrusion 16 that is shaped like a camera aperture and has a wedge-shaped cross section so that a hole with an inner diameter of 2 to 4 mm remains.

In this case, the protrusion 16 is made in such a way that the wall surface 1γ is the same component as the mixing chamber wall 18.

Furthermore, it has proven advantageous to use a sedative 20 in the form of a spirally wound wire.

It is effective to arrange the sedative 20 in the inlet channel 6'.

For this purpose, the inlet channel 6' is provided with a lateral hole 19 into which the outwardly bent end of the spirally wound wire is inserted and fixed.

The feature of the device of the present invention shown in FIG. 2 is that the mixing chamber is provided with a vent hole and the outlet cross section is narrowed, so that the mixing chamber is first filled with the molten metal that has flowed in. The entire filling is completely pacified and the pacifying agent is evenly dispersed in the molten metal.

According to this embodiment, it is possible to fill the sampling chambers 4' and 5' with sample material of the same composition.

Furthermore, thanks to the constriction of the supply channel 10', when the sample is broken after solidification, the sample body 4',
Another feature is that the sample 5' can be easily separated from the rest of the collected sample left in the mixing chamber 9'.

By providing such a narrowed portion, it is possible to set a reference cutting position, and at the same time, it is possible to easily prepare a sample.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the sample collecting device according to the present invention cut in the length direction at a dividing plane of both halves (main body segments). FIG. 2 is a longitudinal sectional view of the modified embodiment. 1...Main body, 2...Stopper, 3.
... Paper tube, 4, 5 ... Dent, 6 ... Inlet side passage, 7 ... Main unit front, 9 ... Mixing chamber , 10...Exit side passage, 11...Protrusion, 12...Flow prevention body, 15...Air vent hole, 16...... Projection, 17...Wall surface, 18...Mixing chamber wall,
19... side hole, 20... sedative coil.

Claims (1)

[Claims] 1. A stopper is provided on the outside to abut against the pipe when inserted into the pipe, and a dent is formed in each of the half bodies to collect the plate-like sample body and the rod-like sample body. and the inlet side flow path leading to the recess is arranged on the front side of the device,
In a molten metal sampling device consisting of a two-part body made of heat-resistant ceramic, the inlet side channels 6 and 6' are connected to the mixing chamber 9.
, 9' and extends to the recess for collecting the rod-shaped sample bodies 5, 5'.
It is connected to the mixing chambers 9, 9', and the inlet side channels 6, 6' and the outlet side channels 10, 10' are arranged side by side in the lower half of the mixing chamber. A molten metal sampling device featuring: 2. The sample collection device according to claim 1, wherein the artificial side flow path 6 and the outlet side flow path 10 are separated by a protrusion 11 protruding into the mixing chamber. 3. A sampling device according to claim 1 or 2, characterized in that the boundary surface of the mixing chamber 9 is provided with at least one flow stopper 12 protruding into the mixing chamber. 4. The sample collection device 5 according to any one of claims 1 to 3, characterized in that the mixing chamber 9 has a circular cross section.The artificial side channel 6 is a mixing chamber. 9. A sample collecting device according to any one of claims 1 to 4, characterized in that the sample collecting device has a cutting-like connection to the sample collecting device 9. 6. According to any one of claims 1 to 5, wherein the artificial side flow path 6 is provided with an enlarged portion 13 on the inner periphery in order to accommodate a deoxidizing agent. Sample collection device as described. 7 The main body 1 has a vent hole 1 at the top apex of the sample collection hollow chamber 4.
4.
The sample collection device according to any one of paragraphs to paragraph 6. 8. Any one of claims 1 to 7, characterized in that the artificial side channel 6 is disposed at an angle with respect to the longitudinal axis of the ceramic body 1. The sample collection device according to one. 9. The volume of the mixing chamber 9' is at least 1.5 times larger than the volume of the sample chamber 4', the mixing chamber 9' is provided with a vent hole 15 at the highest position, and the outlet side flow path 10' is The sample collecting device according to claim 1, characterized in that the sample collecting device has a free passage cross-sectional area narrower than that of the rod-shaped sample body 5'. 10 The narrowed cross section is formed by a protrusion 16 which is shaped like a camera aperture and has a wedge-shaped cross section, and the wall surface 17 of the protrusion is also a component of the mixing chamber wall 18. A sample collection device according to claim 9. 11. The sample collection device according to claim 9, characterized in that the mixing chamber 9' has a volume that is two to three times larger than the sample chamber 4'. Claim 9, characterized in that the inlet side channel 6 arranged parallel to the 12 axis 8' is provided with a horizontal hole 19 for fixing the sedative 20 formed in a spiral shape. The sample collection device described in .