JPS63108954A - Heat insulating material injecting device - Google Patents

Abstract

PURPOSE:To improve heat retaining property to molten metal by arranging a nozzle at a place between the cover of molten metal vessel and the molten surface, and injecting heat insulating material radiately from many injecting holes formed in the nozzle to spray the heat insulating material almost uniformly on the whole molten surface. CONSTITUTION:At the time of pouring the molten steel 12 in a tundish 10 from a ladle, the nozzle 20 is inserted in the hole 16 of cover 14 and blowing is started in a duct 18. The heat insulating material 34 sucked from an ejector 32 from branching pipe 30 is carried by air flow in the dust 18 and reaches the nozzle 20, to inject from respective opening holes of passages 24, 26 and 28 together with air. The heat insulating material 34 injected from the large diameter passage 24 is sprayed on the molten steel 12 surface at far way along longitudinal direction of the tundish 10. Further, the heat insulating material 34 injected from the small diameter passages is sprayed on the molten surface at near area. In this way, the heat insulating material 34 is almost uniformly sprayed on the whole molten surface. And, the heat retaining property of molten metal is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat insulating material charging device that charges a heat insulating material into a meltable container to cover the surface of molten metal with the heat insulating material.

[Prior Art] In continuous casting, it is necessary to strictly control the moisture level of molten steel in the tundish. For this reason, a heat insulating material is put into the tundish and the surface of the molten steel is covered with the heat insulating material to suppress heat radiation from the surface of the molten steel and prevent the temperature of the molten steel from dropping.

Heat insulating material that has been used for some time will be heated and oxidized and deteriorate, reducing its moisturizing effect, so new heat insulating material is added at predetermined intervals until the end of casting to replenish the heat insulating material that covers the hot water surface. There is a need to.

Conventionally, a worker manually inserts the heat insulating material into the tundish through the opening (hole for sampling or ml measurement) in the tundish lid, or
Insulating material is introduced using ducts.

In a conventional heat insulating material feeding device using this duct, the heat insulating material carried by the air flow is guided into the duct, and the heat insulating material is introduced into the duct through the opening of the tundish lid and passed through the spout at the end of the duct inserted into the tundish. The surface is sprayed with I41.

[Problems to be Solved by the Invention] However, in conventional manual charging, the added heat insulating material accumulates on the hot water surface directly below the hole, and the heat insulating material does not spread uniformly over the entire hot water surface. occurs. When heat generation occurs, there is a problem in that the coverage of the hot water surface by the heat insulating material decreases to about 60 to 70%, and the heat retention properties of WI steel deteriorate. Furthermore, if an attempt is made to improve the heat retaining properties of the steel by increasing the coverage of the hot water surface, it is necessary to increase the amount of heat insulating material added each time, and there is a problem that the amount of heat insulating material introduced becomes excessive.

On the other hand, in conventional heat insulating material feeding devices, the spout at the end of the duct opens toward the hot water surface, so the heat insulating material sprayed on the hot water surface accumulates and creates a mess, making it difficult to manually feed the heat insulating material. The same na as in the case occurs.

This invention was made in consideration of these circumstances, and
The heat insulating material can be placed approximately evenly over the entire hot water surface, making wI
It is an object of the present invention to provide a heat insulating material charging @M capable of improving the heat retaining property of a rack and also capable of charging an appropriate amount of heat insulating material.

[Means for Solving Point 111 J The heat insulating material feeding device according to the present invention is capable of injecting the heat insulating material into the container through a hole provided in the lid of the molten container and covering the surface of the molten metal with the heat insulating material. A heat insulating material injection device includes a nozzle inserted between the amount and the hot water surface and formed with a number of radially opening spout ports, and a heat insulating material supplied to the nozzle using gas as a carrier, and the hot water is discharged from the spout ports. It is characterized by having a heat insulating material supply means for dispersing the heat insulating material on the surface. In this case, the nozzle has two pairs of jet ports that are substantially orthogonal to each other in a horizontal plane, one pair of jet ports having a large diameter, and the other pair having a narrow diameter. It is preferable that it is formed.

[Function] In the heat insulating material feeding device according to the present invention, when the nozzle is inserted between the lid of the layered temperature container and the hot water surface, and the heat insulating material is supplied to the nozzle by the heat insulating material supplying means, a large number of radially openings are formed. Insulating material is ejected from the spout. Therefore, the heat insulating material is ejected radially, and the heat insulating material is almost evenly distributed over the hot water surface, improving the coverage of the Wi condensation with the heat insulating material.

[Embodiments] Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing a tundish in which a heat insulating material feeding device according to an embodiment of the present invention is used. The tundish 10 has a box shape that extends in the direction of the arrow 11, and a substantially central portion of one longitudinal side wall protrudes outward (in a direction perpendicular to the direction of the arrow 11) to form a molten steel injection region (not shown). has been done.

Molten steel is injected into the molten steel injection *1* from a ladle (not shown), and molten steel 12 injected from the ladle is accommodated. In addition, there is a 1
114 is covered, and the molten metal level excluding the molten steel injection fI4 area is 11
It is now covered by 4. A plurality of holes 16 for sampling the melt 1112 or for temperature measurement are formed at approximately the center position of the hole 114 . On the other hand, above the tundish 10, a duct 18 is provided that extends substantially horizontally along 1114. The duct 18 is bent into an L-shape above the hole 16 at 114, passes through one of the holes 16, and its tip is disposed inside the tundish 10. A nozzle 20 is attached to the tip of the duct 18 through which the IL 16 is inserted.

The nozzle 20 supplies molten steel 12 in the tundish 10.
It is located above the water level. On the other hand, the base end of the duct is connected to a blower (not shown) that blows a predetermined amount of 5 ml of air. Further, a branch pipe 30 extending downward is provided in the middle of the passage of the duct 18, and this branch pipe 30 passes through the upper plate of the ejector 32, and the tip of the branch pipe 30 is disposed inside the ejector 32. and the duct 18 are in communication. The ejector 32 is a cylindrical airtight container, and a heat insulating material 34 in the form of, for example, a full-length insulating material 34 is housed inside the ejector 32, and the tip of the branch pipe 3o is The heat insulating material 34 is supplied from the ejector 32 to the duct 18 through the opening.

FIG. 2 is a front view of the nozzle 20, and FIG. 3 is a plan view of the nozzle 20. The nozzle 20 has its base end 22 connected to the duct 1.
8, and its tip branches into passages 24, 26, .
28 are formed respectively.

The axes of the proximal end 22, the passage 24, and the passage 26 are orthogonal to each other, and the pair of passages 24 and the pair of passages 26 are opened in all directions around the axis of the proximal end 22. There is. That is, the passages 24 are arranged substantially horizontally along the longitudinal direction of the tundish 10 (in the direction of the arrow 11), and open in the direction of the arrow 11, respectively. Further, the passages 26 are arranged substantially horizontally along a direction perpendicular to the longitudinal direction of the tundish 10 (direction of arrow 11), and open in the direction perpendicular to arrow 11, respectively. Furthermore, a passage 28 that branches into three is formed in the lower part of the nozzle 20, and each of these passages 28 opens radially around the axis of the base end 22.

Moreover, the passage 26 and the passage 28 are formed so that their diameters are smaller than the diameter of the passage 24.

Next, the operation of this embodiment will be explained. When molten Al2 is injected into the tundish 10 from the ladle, the nozzle 20 is inserted into the tundish 10 through the hole 16, and air is blown into the duct 18 from the blower. Then, duct 1
The heat insulating material 34 in the ejector 32 is sucked up through the branch pipe 30 by the air flow flowing through the duct 18, the heat insulating material 34 is mixed into the air flow in the duct 18, and the heat insulating material 34 is carried as a carrier by the air flow. Ru. When the heat insulating material 34 carried by the air flow is guided by the duct 18 and reaches the nozzle 20, the heat insulating material 34 is ejected together with air from the respective openings of the passages 24, 26, and 28. At this time, the diameter of the passage 24 is the same as that of the passage 26.
28, the amount of heat insulating material 34 discharged from the opening of the passage 24 is larger than the diameter of the passage 26.28.
(in the longitudinal direction of the tandish 10 in the direction of the arrow 11)
More heat insulating material 34 is spread on the shoulder surface. For this reason, while the amount of insulation material 34 thrown in is large in the area 1 m away from the nozzle 20, the amount of insulation material 34 thrown in is small in the area near the nozzle 20, and the amount of insulation material 34 thrown in is approximately uniform over the entire shoulder surface. The heat insulating material 34 is now sprayed. When a predetermined amount of the heat insulating material 34 is put in, feed 1 [ is stopped and the feeding of the heat insulating material 34 is stopped. After a predetermined time has elapsed, the heat insulating material 34 covering the hot water surface deteriorates, so the blower is driven and a predetermined amount of the heat insulating material 34 is thrown into the tundish 10 again. Then, until the end of casting, a predetermined amount of heat insulating material 34 is added at predetermined intervals, and the heat insulating material 34 covering the hot water surface in the tundish 10 is
replenish.

Figure 4 shows a comparison between the heat insulating material feeding device of the above embodiment and the conventional heat insulating material feeding device, with the horizontal axis representing the R residence time of molten steel in the tundish and the vertical axis representing the degree of temperature drop of the molten steel. FIG. As is clear from FIG. 4, the heat insulating material feeding device of the above embodiment can suppress the temperature drop of the molten steel in the tundish more than before. For this reason,
It is possible to improve the heat retention of molten steel in the tundish.

In Figure 5, the horizontal axis shows the casting time, and the vertical axis shows the insulation material temperature vI.
! FIG. 2 is a graph diagram comparing the heat insulating material feeding device of the above embodiment with a conventional heat insulating material feeding device. As is clear from FIG. 5, with the conventional feeding device, the amount of heat insulating material introduced at the initial stage of casting increases due to the occurrence of sluggishness, but with the heat insulating material feeding device of the above embodiment, regardless of the casting period. Approximately the same amount of heat insulating material can be put in, and the amount of heat insulating material consumed each time can be reduced compared to the conventional method.

In addition, although the above embodiment shows an example in which the present invention is applied to a tundish, the present invention is not limited to this and can also be applied to other reservoir containers such as a ladle.

Further, in the above embodiments, air is used as a carrier gas for the heat insulating material, but the present invention is not limited to this, and an inert gas such as argon gas may also be used.

[Effects of the Invention] According to the present invention, a nozzle is disposed between the top and the shoulder of the container, and the heat insulating material is spouted radially from a large number of spouts formed in this nozzle, so that the heat insulating material is The coverage of the molten metal can be significantly improved compared to the conventional method. For this reason,
The heat retention of molten metal can be greatly improved. Also,
Since the heat insulating material can be spread almost evenly over the entire hot water surface, the amount of heat insulating material to be added can be set to an appropriate amount, and the consumption amount of the heat insulating material can be suppressed. Therefore, the temperature of the molten metal can be maintained economically.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a tundish in which a heat insulating material injection device according to an embodiment of the present invention is used, Fig. 2 is a front view showing a nozzle, Fig. 3 is a plan view of Fig. 2, Fig. 4, and Fifth
The figure is a graph diagram comparing a heat insulating material feeding device according to an embodiment of the present invention with a conventional heat insulating material feeding device. 10; tanditshu, 12; molten steel, 14; lid, 16;
Hole, 18; Duct, 20; Nozzle, 24.26, 28:
Passageway, 32; Ejector, 34; Insulating material applicant's agent, patent attorney Takehiko Suzue, tandem toilet, A1 edict time Figure 4 fl + i 4 m Figure 5 Showa year, month, day Commissioner of the Patent Office Black 1) Akio Tono 1, Display of the case Patent application No. 61-253631, name of the invention Insulating material feeding device 3, relationship with the amended case Patent applicant (412) Japan tJA Kan Co., Ltd. 4, agent 3-7-2 Kasumigaseki, Chiyoda-ku, Tokyo UBE Building 7,
Details of the amendment (1) Figure 4 will be corrected as shown in the attached drawing. (In the 2nd specification, on page 9, lines 11 and 12, "residence time of molten steel in the tundish" is corrected to "casting time".

Claims (2)

[Claims] (1) In a heat insulating material injection device that insulates the heat insulating material into the container through a hole provided in the lid of the molten metal container and covers the surface of the molten metal with the heat insulating material, the material is inserted between the lid and the surface of the molten metal and is inserted in a radial shape. A nozzle is formed with a large number of spout openings, and a heat insulating material supplying means supplies a heat insulating material to the nozzle using gas as a carrier and scatters the heat insulating material from the spout to the hot water surface. Insulating material feeding device. (2) The nozzle has two pairs of jet ports whose jet directions are substantially orthogonal to each other within this plane, one pair of jet ports having a large diameter, and the other pair having a large diameter. The heat insulating material feeding device according to claim 1, characterized in that it is formed thin.