JPH0320036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a powder dispersion device for continuous casting.

[Prior art] In continuous steel casting, powder or granules containing CaO and SiO ₂ as main components are deposited on the molten metal (hereinafter referred to as molten metal) surface of the casting mold for purposes such as oxidation prevention, lubrication, and heat retention. The powder is supplied and sprayed, but
Previously, this spraying work had to be done manually.

However, in recent years, in order to improve the work environment, safety, and workability, automatic feeding devices have been adopted for powder spraying operations, and various structures and
A method has been proposed.

[Problems to be solved by the invention] Conventional automatic supply devices of this type have been designed to supply desired casting powder from a powder storage hopper to a powder spreader on a mold along with a carrier fluid (for example, air) using a pneumatic method. However, it is sprayed on the molten metal surface,
Depending on the size and shape of the mold, a plurality of sprayers corresponding to the number of powders to be discharged may be required, which is disadvantageous in terms of equipment and is not perfect in terms of preventing dust generation.

This idea eliminates these conventional inconveniences,
It is an object of the present invention to provide a powder supply device that is advantageous in terms of equipment and operation and can effectively prevent dust generation.

[Means for Solving the Problems] To achieve this object, the powder dispersion device of this invention supplies continuous casting powder at a constant pressure and has a powder supply/distributor disposed above the mold. In the powder dispersion device, a suction mechanism for pressure drop and dust suction is connected to the upper part of the powder supply/distributor, and a first funnel-shaped powder receiving part for receiving the entire amount of powder is provided in the distributor. and a second funnel-shaped powder receiving part divided into a plurality of parts is provided below the first powder receiving part,
The present invention is characterized in that a flexible spraying hose that can adjust the powder supply direction is attached to the lower part of the second powder receiving part.

Further, the present invention is characterized in that, in the above-mentioned powder dispersing device, air nozzles for finely adjusting the amount of powder discharged are installed at upper positions of the second powder receiving portions.

[Operation] In this invention, the powder fed under pressure to the powder supply/distributor is depressurized to about atmospheric pressure at the same time as the dust is removed by the suction mechanism, and the powder is transferred from the first powder receiving part to the second powder receiving part. The liquid is distributed smoothly and accurately to the surface of the molten metal via a hose. Further, if necessary, it is also possible to finely adjust the powder discharge amount using an air nozzle.

[Example] Hereinafter, an example of this invention will be described based on the drawings.

Figure 1 is an overall view showing one embodiment of the present invention;
The figure is a top view of the molten metal surface in this embodiment, FIG. 3 is a sectional view taken along the line A-A in FIG. 1, and FIG. 4 shows an example of dispersing powder into a mold for a slab.

In Fig. 1, 1 is a hopper that accommodates powder for continuous casting, 2 is a feeder for discharging powder provided at the bottom of the hopper 1, and 3 is connected to the feeder 2 at one end, and the other end is used to supply the next powder. Powder supply hose connected to the distribution mechanism. The continuous casting powder contained in the hopper 1 is discharged from the feeder 2 in a required amount and sent together with a conveying fluid (for example, air) under a constant pressure via a hose 3 to a powder supply and distribution mechanism. Of course, in the present invention, these powder storage/feeding mechanisms are not limited to the illustrated example, and may be replaced by other known types.

Further, 4 is a powder supply distributor into which the other end of the powder supply hose 3 is inserted;
One end of a dust suction pipe 5 having a suction air regulating valve 6 is connected to the upper part of the dust suction pipe 5, and a simple dust collector 15 is connected to the other end of the suction pipe 5. These suction/dust collection mechanisms reduce the pressure of the powder fed to the powder supply distributor 4 at a constant pressure to around atmospheric pressure, lowering the pressure inside the distributor and at the same time sucking and removing the dust generated during powder feeding. fulfill the role of

The powder supply distributor 4 is formed into a box shape as a whole, and includes a funnel-shaped powder receiving part (hereinafter referred to as a first powder receiving part) 7 that receives the entire amount of powder at an approximately intermediate position inside thereof, and a powder receiving part 7 that receives the entire amount of powder. Below the receiving part 7, the cross section of the distributor is divided into a plurality of sections through a gap 10 by a partition plate 8 (for example, divided into four sections equally as shown in FIG. 3).
A space part 11 (divided into two parts) and a small funnel-shaped powder receiving part (hereinafter referred to as a second powder receiving part) 9 are provided in the lower part of the space part 11, corresponding to each divided part. . The upper end of the partition plate 8 is formed into a knife shape to facilitate the flow of powder.

Through these first powder receiver 7, partition plate 8, and second powder receiver 9, the powder fed into the distributor 4 falls smoothly and is distributed almost evenly in proportion to the number of divisions. It is discharged from the distributor in the distributed state.

Furthermore, in the figure, reference numeral 12 denotes a flexible spraying hose connected to the lower end of each of the second powder receiving parts 9, and the hose 12 can freely direct its discharge direction, that is, at an optimal position above the upper surface of the molten metal 14 in the mold 13. It has become possible to direct it. In addition,
20 is a submerged nozzle for continuous casting.

Next, in the present invention, in order to finely adjust the amount of powder discharged from the second powder receiving part 9, air is placed in the vicinity of the upper part of the second powder receiving part 9, that is, in the divided space 11. It is preferable to install the nozzle 16 with its spray direction facing downward. The air nozzle 16 is connected to the air regulating valve 1 as shown in FIG.
communicated with the manifold pipe 18 via 7,
The pipe 18 is further connected to an air supply via a pressure regulator 19. This powder discharge amount fine adjustment mechanism is used when the reduction of powder is not uniform at each powder supply point due to the situation on the molten metal surface, or when there is a slight difference in the discharge amount due to the arrangement (curvement) of the spray hose 12. It is advantageous for adjustment in such situations. However, this is not particularly essential in the present invention.

Incidentally, if a vibrator is attached to the powder supply/distributor 4, it is effective for smoothly dropping the powder when the powder tends to stagnate on the sloped wall of the funnel-shaped powder receiving portion.

FIG. 2 shows an example in which the present invention is applied to a mold for casting billet material or bloom material, in which a flexible hose 12 is inserted from the second powder receiving part 9 divided into four parts as shown in FIGS. 1 and 3. Powder 21 is discharged into the center of each section through the. Of course, when the shape of the mold in this case is a slab material mold 22 shown in FIG. 4, the flexible hoses 12 may be arranged side by side so that their discharge ports are substantially in a straight line.

Although an example of four pieces of the second powder receiving part 9 and the flexible spraying hose 12 are illustrated, the number of these can be increased or decreased according to the need to increase or decrease the number of sections of the partition plate. can be done, but
A minimum of two is required.

[Effects of the invention] As explained above, according to the powder dispersion device of the present invention, there is no need to provide dispersion containers according to the number of discharge points on the mold as in the past, and one
It is sufficient to install one powder distributor for each mold, which is not only advantageous in terms of equipment but also has many advantages in terms of operation. It also has great practical effects, such as not generating dust and the flexible hose making it easy to change the discharge destination.

Furthermore, when the mechanism for controlling the amount of powder discharged according to the present invention is added, it becomes possible to supply powder with higher precision and in accordance with the situation of the powder sprinkled on the surface of the molten metal.

[Brief explanation of the drawing]

Figure 1 is an overall view showing one embodiment of this invention, Figure 2 is a top view of the molten metal surface in this embodiment, and Figure 3 is a top view of the molten metal surface in this embodiment.
The figure is a sectional view taken along the line A-A in FIG. 1, and FIG. 4 is a top view of the molten metal surface showing an example of spraying powder onto a mold for a slab. 1...Powder storage hopper, 2...Feeder, 3
... Powder supply hose, 4 ... Powder supply distributor, 5 ... Suction pipe, 6 ... Air adjustment valve, 7 ... First powder receiver, 8 ... Partition plate, 9 ... Second powder Receiving part, 10... Gap, 11... Space part,
12...Flexible spray hose, 13, 22...
... Mold, 14 ... Molten metal, 15 ... Simple dust collector, 16 ... Air nozzle, 17 ... Air discharge adjustment valve, 18 ... Manifold pipe, 19 ... Pressure regulator, 20 ... Immersion nozzle, 21 ... Powder.

Claims (1)

[Claims for Utility Model Registration] 1. Powder for continuous casting is supplied at a constant pressure,
In a powder dispersion device for continuous casting having a powder supply/distributor disposed above the mold, a suction mechanism for pressure drop and dust suction is connected to the top of the powder supply/distributor, and a suction mechanism is connected to the top of the powder supply/distributor, and a , a first funnel-shaped powder receiving part for receiving the entire amount of powder, and a second funnel-shaped powder receiving part divided into a plurality of parts below the first powder receiving part, and a lower part of the second powder receiving part. A powder dispersion device for continuous casting, characterized in that a flexible dispersion hose capable of adjusting the powder supply direction is attached to the powder dispersion device. 2 At the upper position of the second powder receiving part,
The spraying device according to claim 1, further comprising an air nozzle for finely adjusting the amount of powder discharged.