KR101204933B1 - Apparatus for collecting sample of powder and method for collecting sample of powder - Google Patents

Abstract

The present invention is formed to extend in the longitudinal direction and has a frame having a bottom and a rail, the container is installed to move along the rail and the end facing the bottom is opened, and formed on the bottom to the drop when the container Provided is a powder sampling device and collection method comprising a sealing member sealing between an open end of a container and the bottom.

Description

Powder Sampling Apparatus and Sampling Method {APPARATUS FOR COLLECTING SAMPLE OF POWDER AND METHOD FOR COLLECTING SAMPLE OF POWDER}

The present invention relates to a device for sampling a powder in a mold of a continuous casting machine and a method for collecting the sample.

In general, a continuous casting machine is a facility for producing slabs of a constant size by receiving a molten steel produced in a steelmaking furnace and transferred to a ladle in a tundish and then supplying it as a mold for a continuous casting machine.

The continuous casting machine includes a ladle for storing molten steel, a continuous casting machine mold for cooling the tundish and the molten steel discharged from the tundish to form a casting having a predetermined shape, and a casting formed in the mold connected to the mold. It includes a plurality of pinch roller to move.

Above the molten steel in the mold, powder is added as a lubricant to prevent molten steel reoxidation, absorption of inclusions in the molten steel, insulation, and friction with the solidification shell during vertical oscillation of the mold.

SUMMARY OF THE INVENTION An object of the present invention is to provide a powder sampling device and a collecting method for collecting a powder target by a simple mechanism.

Powder sampling apparatus according to an embodiment of the present invention for realizing the above object is formed to extend in the longitudinal direction, the frame having a bottom and a rail, and installed to move along the rail end facing the bottom And a sealing member formed at the bottom to seal the opening between the open end of the container and the bottom when the container is dropped.

Here, the rail is formed to extend in the longitudinal direction, the container may also be formed to extend in the longitudinal direction.

Here, the container may further include a connection member movably connected to the rail while being fixed.

Here, the rail may include three rods arranged to form a triangle, and the connection member may be a triangular plate.

Here, the closure member may include a protrusion which is inserted into the open end of the container or protrudes from the bottom in a size such that the open end is inserted.

Here, a second protrusion may be included at a position corresponding to the protrusion on an opposite surface of the surface on which the protrusion is formed among opposite surfaces of the bottom.

Here, a handle protruding from the opposite end of the bottom-shaped end of the opposite ends of the frame may be further provided.

Powder sampling method according to another embodiment of the present invention, the step of immersing the bottom end of the powder sampling device is located in the molten steel, and removing the force restraining the container in the container above the molten steel Dropping the container so that a powder sample is received; sealing between the open end of the container and the bottom by the sealing member; and withdrawing the powder sample collection device from the molten steel; It may include the step of allowing the powder sample collected in the container to be solidified.

The coagulation of the powder sample collected in the container may include maintaining the powder sample collection device in the air.

According to the powder sampling device and the sampling method according to the present invention configured as described above, the sampling of the powder put into the mold can be made in a simple manner.

1 is a side view showing a continuous casting machine according to an embodiment of the present invention,
2 is a conceptual diagram illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel (M),
3 is a conceptual diagram illustrating a distribution form of molten steel M in the mold 30 and the adjacent portion of FIG. 2,
4 is a perspective view showing a powder sample collection device 100 according to an embodiment of the present invention,
5 is a flow chart showing a powder sampling method according to another embodiment of the present invention,
6 is a conceptual diagram conceptually illustrating the sequence of FIG. 5.

Hereinafter, a powder sampling device and a sampling method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, different embodiments are given the same or similar reference numerals for the same or similar configurations, and the description is replaced with the first description.

Continuous casting is a casting method in which a casting or steel ingot is continuously extracted while solidifying molten metal in a mold without a bottom. Continuous casting is used to manufacture simple products such as squares, rectangles, circles, and other simple cross-sections, and slab, bloom and billets, which are mainly for rolling.

The type of continuous casting machine is classified into vertical type, vertical bending type, vertical axis difference bending type, curved type and horizontal type. 1 and 2 illustrate a curved shape.

1 is a side view showing a continuous casting machine related to an embodiment of the present invention.

Referring to this drawing, the continuous casting machine may include a tundish 20, a mold 30, secondary cooling tables 60 and 65, a pinch roll 70, and a cutter 90.

The tundish 20 is a container that receives molten metal from the ladle 10 and supplies molten metal to the mold 30. Ladle 10 is provided in a pair, alternately receives molten steel to supply to the tundish 20. In the tundish 20, the molten metal supply rate is adjusted to the mold 30, the molten metal is distributed to each mold 30, the molten metal is stored, and the slag and the non-metallic inclusions are separated.

The mold 30 is typically made of water-cooled copper and allows the molten steel to be primary cooled. The mold 30 forms a hollow portion in which molten steel is accommodated as a pair of structurally facing faces are opened. In manufacturing the slab, the mold 30 comprises a pair of barriers and a pair of end walls connecting the barriers. Here, the short wall has a smaller area than the barrier. The walls of the mold 30, mainly short walls, may be rotated to move away from or close to each other to have a certain level of taper. This taper is set to compensate for shrinkage caused by solidification of the molten steel M in the mold 30. The degree of solidification of the molten steel (M) will vary depending on the carbon content, the type of powder (steel cold Vs slow cooling), casting speed and the like depending on the steel type.

The mold 30 has a strong solidification angle or solidifying shell 81 (see FIG. 2) so that the casting extracted from the mold 30 maintains its shape and does not leak molten metal which is still less solidified. It serves to form. The water cooling structure includes a method of using a copper pipe, a method of drilling a water cooling groove in the copper block, and a method of assembling a copper pipe having a water cooling groove.

The mold 30 is oscillated by the oscillator 40 to prevent the molten steel from sticking to the wall of the mold. Lubricants are used to reduce friction between the mold 30 and the casting during oscillation and to prevent burning. Lubricants include splattered flat oil and powder added to the molten metal surface in the mold 30. The powder is added to the molten metal in the mold 30 to become slag, as well as the lubrication of the mold 30 and the casting, as well as the oxidation and nitriding prevention and thermal insulation of the molten metal in the mold 30, and the non-metal inclusions on the surface of the molten metal. It also performs the function of absorption. In order to inject the powder into the mold 30, a powder feeder 50 is installed. The part for discharging the powder of the powder feeder 50 faces the inlet of the mold 30.

The secondary cooling zones 60 and 65 further cool the molten steel that has been primarily cooled in the mold 30. The primary cooled molten steel is directly cooled by the spray 65 spraying water while maintaining the solidification angle by the support roll 60 so as not to deform. Casting solidification is mostly achieved by the secondary cooling.

The drawing device adopts a multidrive method using a plurality of sets of pinch rolls 70 and the like so that the casting can be taken out without slipping. The pinch roll 70 pulls the solidified tip of the molten steel in the casting direction, thereby allowing the molten steel passing through the mold 30 to continuously move in the casting direction.

The cutter 90 is formed to cut continuously produced castings to a constant size. As the cutter 90, a gas torch, a hydraulic shear, or the like can be employed.

FIG. 2 is a conceptual view illustrating the continuous casting machine of FIG. 1 based on the flow of molten steel M. Referring to FIG.

Referring to this figure, the molten steel (M) is to flow to the tundish 20 in the state accommodated in the ladle (10). For this flow, the ladle 10 is provided with a shroud nozzle 15 extending toward the tundish 20. The shroud nozzle 15 extends to be immersed in the molten steel in the tundish 20 so that the molten steel M is not exposed to air and oxidized and nitrided. The case where molten steel M is exposed to air due to breakage of shroud nozzle 15 is called open casting.

The molten steel M in the tundish 20 flows into the mold 30 by a submerged entry nozzle 25 extending into the mold 30. The immersion nozzle 25 is disposed in the center of the mold 30 so that the flow of molten steel M discharged from both discharge ports of the immersion nozzle 25 can be symmetrical. The start, discharge speed, and stop of the discharge of the molten steel M through the immersion nozzle 25 are determined by a stopper 21 installed in the tundish 20 corresponding to the immersion nozzle 25. Specifically, the stopper 21 may be vertically moved along the same line as the immersion nozzle 25 to open and close the inlet of the immersion nozzle 25. Control of the flow of the molten steel M through the immersion nozzle 25 may use a slide gate method, which is different from the stopper method. The slide gate controls the discharge flow rate of the molten steel M through the immersion nozzle 25 while the sheet material slides in the horizontal direction in the tundish 20.

The molten steel M in the mold 30 starts to solidify from the part in contact with the wall surface of the mold 30. This is because heat is more likely to be lost by the mold 30 in which the periphery is cooled rather than the center of the molten steel M. The rear portion along the casting direction of the strand 80 is formed by the non-solidified molten steel 82 being wrapped around the solidified shell 81 in which the molten steel M is solidified by the method in which the peripheral portion first solidifies.

As the pinch roll 70 (FIG. 1) pulls the tip portion 83 of the fully solidified strand 80, the unsolidified molten steel 82 moves together with the solidified shell 81 in the casting direction. The uncondensed molten steel 82 is cooled by the spray 65 for spraying cooling water in the course of the above movement. This causes the thickness of the uncooled steel (82) in the strand (80) to gradually decrease. When the strand 80 reaches a point 85, the strand 80 is filled with the solidification shell 81 in its entire thickness. The solidified strand 80 is cut to a predetermined size at the cutting point 91 and divided into a product P such as a slab.

The form of the molten steel M in the mold 30 and the part adjacent to it is demonstrated with reference to FIG. FIG. 3 is a conceptual diagram illustrating a distribution form of molten steel M in the mold 30 and adjacent portions of FIG. 2.

Referring to FIG. 3, a pair of discharge ports 25a are typically formed at the end side of the immersion nozzle 25 on the left and right sides of the drawing (in the form of the mold 30 and the immersion nozzle 25, the center line C is formed). Assuming that the reference is symmetrical, only the left side is shown in this drawing}.

The molten steel M discharged together with the argon (Ar) gas from the discharge port 25a draws a trajectory flowing in the upward direction A1 and downward direction A2 as indicated by arrows A1 and A2. do.

The powder layer 51 is formed on the upper part of the mold 30 by the powder supplied from the powder feeder 50 (see FIG. 1). The powder layer 51 may include a layer 51a existing in a form in which powder is supplied and a layer 51b sintered by the heat of molten steel M (see FIG. 6). Below the powder layer 51, a slag layer or a liquid fluidized layer 52 formed by melting powder by molten steel M is present. The liquid fluidized bed 52 maintains the temperature of the molten steel M in the mold 30 and blocks the ingress of foreign matter. A portion of the powder layer 51 solidifies at the wall surface of the mold 30 to form a lubrication layer 53. The lubrication layer 53 functions to lubricate the solidified shell 81 so as not to stick to the mold 30.

The thickness of the solidification shell 81 becomes thicker as it progresses along the casting direction. The portion where the mold 30 of the solidification shell 81 is positioned is thin, and an oscillation mark 87 may be formed according to the oscillation of the mold 30. The solidification shell 81 is supported by the support roll 60, and the thickness thereof is thickened by the spray 65 for spraying water. The solidification shell 81 may be thickened, and a bulging region 88 may be formed in which a portion protrudes convexly.

Now, an apparatus and a method for collecting the samples for the powder layer 51 and the liquid fluidized bed 52 described above, that is, the powder sample 55 (see FIG. 6) will be described.

First, Figure 4 is a perspective view showing a powder sampling device 100 according to an embodiment of the present invention.

Referring to this drawing, the powder sample collection device 100 may include a frame 110, a container 120, and a sealing member 130.

The frame 110 may be formed to extend in the longitudinal direction. The frame 110 may include a bottom 111 and a rail 112. One end of the rail 112 may be connected to the bottom 111. The rail 112 may be disposed substantially perpendicular to the floor 111. In the present embodiment, the rail 112 is formed of three rods arranged at three vertices of a triangle.

The vessel 120 is formed to move in the longitudinal direction along the rail 112. To this end, the container 120 may be coupled to the connecting member 115. The connection member 115 may be formed so that the rail 112 is slidably inserted and the container 120 is inserted and fixed. The connection member 115 may be formed of a triangular plate material corresponding to the arrangement of the rails 112.

The container 120 is a hollow body in the form of a cylinder, and may have a shape extending along the lengthwise direction similar to the rail 112. The container 120 may have a shape in which both ends thereof are opened so that a hollow portion thereof communicates with the outside.

The sealing member 130 is formed on the bottom 111. The sealing member 130 may seal between the container 120 and the bottom 111 in a state where the container 120 contacts the bottom 111. The sealing member 130, in this embodiment, has the form of a protrusion projecting from the bottom 111 while having a size to be inserted into the open end 121 of the container 120. Alternatively, the sealing member 130 may protrude as a ring shape, so that the end 121 of the container 120 may be inserted into the upper ring so as to contact the inner circumferential surface of the ring.

The powder sample collection device 100 configured as described above may further include a second protrusion 140 and a handle 150.

The second protrusion 140 may be formed to protrude from a surface opposite to a surface on which the sealing member 130 is formed on opposite surfaces of the bottom 111. The second protrusion 140 serves to penetrate the molten steel while the powder sampling device 100 is immersed in the molten steel.

The handle 150 may be provided for an operator who takes a powder sample.

Next, a powder sampling method using the powder sampling device 100 will be described with reference to FIGS. 5 and 6. 5 is a flowchart illustrating a powder sampling method according to another embodiment of the present invention, and FIG. 6 is a conceptual diagram conceptually illustrating the procedure of FIG. 5.

Referring to the drawings (and FIGS. 1 to 4), first, the powder sampling device 100 may be lowered to be immersed in the unsolidified molten steel 82 in the mold 30 (S1). At this time, the container 120 is kept away from the bottom (111).

If the powder sampling device 100 is not immersed through the powders 51 and 52 in the unsolidified molten steel 82, the powder sampling device 100 will be further lowered. When the powder sampling device 100 is sufficiently lowered and immersed in the uncondensed molten steel 82 (S2), the container 120 is dropped (S3). Dropping of the vessel 120 may be accomplished in a simple manner such as removing the force that was holding the vessel far from the bottom 111. In other words, the container 120 is guided toward the sealing member 130 by the rail 112 during free fall.

The container 120 receives some of the powders 51 and 52 (powder sample 55) in its hollow portion while falling. The end 121 of the container 120 containing the powder sample 55 is sealed from the outside by the sealing member 130 inserted into the end 121 (S4).

In the state where the powder sample 55 is accommodated in the container 120 and is sealed, the powder sample collection device 100 is taken out (S5). The withdrawal of the powder sampling device 100 may be made by raising the powder sampling device 100 by holding the handle 150.

After withdrawal to the powder sampling device 100, the powder sampling device 100 may be placed in the atmosphere for a predetermined time. As a result, the powder sample 55 separated from the hot unmelted molten steel 82 may be solidified (S6). The solidified powder sample 55 may be analyzed through a predetermined procedure.

The powder sampling device and the sampling method as described above are not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: ladle 15: shroud nozzle
20: tundish 25: immersion nozzle
30: mold 40: mold oscillator
50: powder feeder 51: powder layer
52: liquid fluidized bed 53: lubricating layer
60: support roll 65: spray
70: pinch roll 80: strand
81: solidified shell 82: unsolidified molten steel
83: tip 85: solidification completion point
87: oscillation mark 88: bulging area
90: cutting machine 91: cutting point
100: powder sampling device 110: frame
120: container 130: sealing member
140: second protrusion 150: handle

Claims (9)

A frame formed to extend in a vertical length direction and having a bottom and a rail;
A container installed to move along the rail, the end facing the bottom being opened;
A sealing member formed on the bottom to seal between the opened end of the container and the bottom when the container falls; And
And a connecting member fixedly connected to the rail while being fixed to the container.
The rail is formed to extend in the longitudinal direction of the frame, the container is also formed to extend along the longitudinal direction of the frame,
And the rail has three rods arranged to form a triangle, and the connecting member is a triangular plate.
delete delete delete The method of claim 1,
And the sealing member comprises a protrusion which is inserted into the opened end of the container or protrudes from the bottom to a size such that the opened end is inserted.
The method of claim 5,
The powder sampling device of claim 2, wherein a second protrusion is formed at a position corresponding to the protrusion on an opposite side of the surface on which the protrusion is formed on opposite surfaces of the bottom.
The method of claim 1,
And a handle protruding from an opposite end of the bottomed end of opposite ends of the frame.
Immersing the bottomed end of the powder sampling device according to any one of claims 1 and 5 to 7 in molten steel;
Removing the force restraining the container, causing the container to drop so that the powder sample on the molten steel is received in the container;
Sealing by the closure member between the opened end of the container and the bottom;
Withdrawing the powder sampling device from the molten steel; And
And causing the powder sample collected in the container to coagulate.
9. The method of claim 8,
The step of causing the powder sample collected in the container to solidify,
Maintaining the powder sampling device in the atmosphere.

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