KR100848397B1 - An apparatus for adding additive to molten steel invacuum degassing vessel - Google Patents

Abstract

An apparatus for injecting additives into molten steel in a vacuum degasser is provided to protect cylinder rods and gates of cylinders for opening or closing outlets of a vacuum hopper and a sub hopper, and remove additives adhered to the circumference of the gates and the outlets by spraying air from outer peripheral parts of the gates. In an apparatus for injecting additives into molten steel in a vacuum vessel of a vacuum degasser, the apparatus comprises: a vacuum hopper(100) having an inlet(110) and an outlet(120) formed thereon to flow additives into the vacuum hopper and discharge the additive from the vacuum hopper, the outlet being connected to the vacuum vessel; an opening-and-closing part(130) including a cylinder(131) installed on the vacuum hopper and a gate(133) installed on a cylinder rod(131a) of the cylinder to open or close the outlet of the vacuum hopper; and a cover part(140) which is formed in a multi-tube shape that expands and contracts like an antenna to cover the cylinder rod of the cylinder, and which is integrally expanded and contracted by the operation of the cylinder rod. The apparatus further comprises: a sub hopper(200) connected to the inlet of the vacuum hopper to inject additives into the vacuum hopper, the sub hopper having a sub inlet(210) formed thereon to flow the additives into the sub hopper and a sub outlet formed thereon such that the sub outlet is connected to the inlet of the vacuum hopper, the sub outlet being opened or closed by a sub gate(233) installed on a cylinder rod(231a) of a sub cylinder(231); and a sub cover part(240) which is formed in a multi-tube shape that expands and contracts like an antenna to cover the cylinder rod of the sub cylinder, and which is integrally expanded and contracted by the operation of the cylinder rod.

Description

Additive input device of vacuum degassing facility {AN APPARATUS FOR ADDING ADDITIVE TO MOLTEN STEEL INVACUUM DEGASSING VESSEL}

1 is a block diagram showing an additive input device of a general vacuum degassing equipment,

Figure 2 is a block diagram showing an additive input device of the vacuum degassing equipment according to the present invention,

3 is a cutaway perspective view showing a vacuum hopper according to the present invention,

Figure 4 is a perspective view of the main incision showing the opening and closing portion and the cover portion which is the main part of the present invention,

5a and 5b is an operating state diagram showing the operating state of the additive input device of the vacuum degassing equipment according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: vacuum hopper 110: inlet

120: outlet 130: opening and closing part

131: cylinder 133: gate

135: injection hole 137: gate packing

140: cover 141: tube packing

150: vacuum piping 200: subhopper

210: sub inlet 220: sub outlet

231: subcylinder 233: subgate

235: injection hole 240: sub-cover portion

300a, 300b: Air supply pipe

The present invention relates to an additive injector of a vacuum degassing plant, and more particularly, to protect a gate provided in a hopper, which is a means for injecting an additive, which is introduced into molten steel, into a vacuum tank, and to maintain airtightness between the gate and the outlet. It relates to an additive input device of the vacuum degassing plant.

In general, molten iron produced in the blast furnace contains a large amount of carbon, which is removed to a certain level (about 0.04%) by charging molten iron into the converter and supplying oxygen to the converter.

The molten iron from which carbon has been removed to a certain level is called molten steel. The molten steel that has undergone the converter process is transferred to a vacuum degassing facility and an additive (alloy iron) is introduced to adjust the composition of the molten steel and stirred under vacuum. The temperature becomes uniform. Thereafter, gas components remaining in the molten steel are removed, and then the slab is manufactured by a continuous casting machine.

1 is a block diagram showing an additive input device of a general vacuum degassing equipment.

As shown in FIG. 1, the additive input device of a general vacuum degassing facility is installed between the subhopper 10, in which additives are stored first, and the subhopper 10 and the vacuum chamber 30. Injecting the additives), it is composed of a vacuum hopper 20 for maintaining a vacuum state in order to maintain the vacuum balance of the vacuum chamber (30).

The vacuum hopper 20 is provided with a vacuum pipe 40 to maintain the vacuum balance therein. In addition, inlets 11 and 21 and outlets 13 and 23 are formed in the subhopper 10 and the vacuum hopper 30, respectively, and the cylinders 15 and 25 operate in the outlets 13 and 23. Gates 17 and 27 which are opened and closed by the above are provided. Thus, as the gates 17 and 27 operate organically and the air is interrupted through the vacuum pipe 40, the vacuum balance in the vacuum hopper 20 is maintained.

First, the additive for adjusting the composition of the molten steel is transported by the transport device and stored in the subhopper 10, and when the inlet 11 of the subhopper 10 is closed, the cylinder 15 is operated to operate the subhopper 10. The gate 17 of) is opened and the additives are filled in the vacuum hopper 20. Then, the gate 17 of the subhopper 10 is closed and the inside of the vacuum hopper 20 is vacuumed through the vacuum pipe 40.

In such a state that the vacuum balance inside the vacuum hopper 20 is maintained, the cylinder 25 provided in the vacuum hopper 20 is operated to open the gate 27 of the vacuum hopper 20, and the additive is introduced into the vacuum chamber 30. To adjust the composition of the molten steel.

In this case, the gates of the subhopper and vacuum hopper are installed at the cylinder rod end of the cylinder to operate. In the process of adding the additive, a direct blow occurs on the cylinder rod and the gate by the additive, and the additive is a ferroalloy. Damage and breakage of the rods and gates occur.

When the cylinder rod and the gate are damaged and broken in this way, the gate and the outlet are not tightly contacted with each other and air leaks occur. For this reason, there is a problem in keeping the inside of the vacuum hopper in a vacuum state.

The present invention has been made to solve the above problems, the present invention is to protect the cylinder rod and the gate of the cylinder to open and close the outlet of the vacuum hopper and sub-hopper, the air injection from the outer peripheral portion of the gate around the gate and outlet It is an object of the present invention to provide an additive injector of a vacuum degassing plant that can remove an attached additive.

Hereinafter, the additive input device of the vacuum degassing equipment according to the present invention for achieving the above object is formed inlet and outlet outlet for the additive is introduced, the vacuum hopper is connected to the vacuum chamber; An opening and closing portion having a cylinder installed at the vacuum hopper and a cylinder rod installed at the cylinder rod of the cylinder to open and close the outlet of the vacuum hopper; And a cover part installed to surround the cylinder rod of the cylinder and integrally stretched by the operation of the cylinder rod.

In addition, it is connected to the inlet of the vacuum hopper, and further comprises a subhopper for injecting additives into the vacuum hopper, wherein the subhopper is formed a sub inlet through which the additive is introduced and a sub outlet connected to the inlet of the vacuum hopper is formed The sub discharge port is opened and closed by a sub gate installed on the cylinder rod of the sub cylinder, and is provided to surround the cylinder rod of the sub cylinder, and further includes a sub cover part integrally stretched by the operation of the cylinder furnace. It features.

In addition, an injection hole is formed along a side end of the gate or subgate, and an air supply pipe through the vacuum hopper or the subhopper to supply air into the cover part or the sub cover part is further provided. It is characterized in that the air supplied is injected through the injection hole.

At this time, the gate or sub-gate is characterized in that the gate packing is provided along the outer peripheral surface of the lower surface.

In addition, the cover portion or the sub-cover portion is characterized in that it is composed of a multi-stage tube is stretched in the antenna type, the tube packing is installed in the contact portion in which the multi-stage tube is in contact with each other.

And, the vacuum hopper is characterized in that it is further provided with a vacuum pipe for adjusting the vacuum balance therein.

Hereinafter, with reference to the drawings the additive input device of the vacuum degassing equipment according to the present invention.

Figure 2 is a block diagram showing the additive input device of the vacuum degassing equipment according to the present invention, Figure 3 is a cutaway perspective view showing a vacuum hopper according to the present invention.

As shown in FIG. 2, the additive injecting apparatus of the vacuum degassing apparatus according to the present invention is connected to a vacuum tank in which molten steel is vacuum-refluxed, and supplies a vacuum hopper 100 to supply the additive to the vacuum tank, and to the vacuum hopper 100. Opening and closing portion 130 for opening and closing the formed outlet 120, and cover portion 140 to protect the opening and closing portion 130.

In addition, it is further connected to the inlet 110 formed in the vacuum hopper 100, and further includes a sub-hopper 200 for injecting additives into the vacuum hopper (100).

As shown in FIG. 3, the vacuum hopper 100 is a housing filled with additives therein, and has an approximately narrow shape, and an inlet 110 into which an additive is introduced is formed on an upper surface thereof. An outlet 120 for discharging to the vacuum chamber is formed.

At this time, the vacuum hopper 100 may be connected to the vacuum pipe 150 to adjust the vacuum balance therein.

The opening and closing unit 130 is installed at the end of the cylinder 131 installed on the upper portion of the vacuum hopper 100 and the cylinder rod 131a of the cylinder 131 to open and close the outlet 120 of the vacuum hopper 100. The gate 133 is formed.

The cylinder 131 is installed outside the vacuum hopper 100, and the cylinder rod 131a extends in the direction of the outlet 120 in the vacuum hopper 100.

Figure 4 is a perspective view of the main part incision showing the opening and closing portion and the cover portion which is the main part of the present invention.

As shown in FIG. 4, the gate 133 is a means for controlling the outlet 120. In the present invention, the gate 133 is formed in a cone shape so that the outer circumferential surface of the lower surface closely adheres to the inner circumference of the outlet 120. And confidentiality is maintained. At this time, the shape of the gate 133 is not limited to a cone shape, and may be any shape as long as it can open and close the outlet 120.

In addition, the gate 133 may be provided with an O-ring-shaped gate packing 137 along the outer circumferential surface of the lower surface of the gate 133. Therefore, the adhesion between the gate 133 and the outlet 120 is increased.

In addition, a plurality of injection holes 135 are formed along a side end portion of the gate 133, that is, an upper outer peripheral portion of the position where the gate packing 137 is installed.

The plurality of injection holes 135 are formed to be spaced apart from each other, each of which is preferably formed to open in the upper direction and the outer direction.

The cover part 140 is a means for protecting the cylinder rod 131a of the cylinder 131 from the impact of the additive, and is provided to surround the cylinder rod 131a, the upper end of which is disposed on the vacuum hopper 100. It is fixed, the lower end is fixed to the gate 133 is installed to be integrally stretchable by the operation of the cylinder rod (131a).

In the present invention, the cover portion 140 is composed of a multi-stage tube configured to be stretched in an antenna type, but the cover portion 140 may be configured in any shape as long as it can protect and extend the cylinder rod 131a, For example, it may be composed of a corrugated tube.

The multi-stage tube is preferably provided with an O-ring tube packing 141 in contact with each other to maintain the airtightness between each other.

In addition, the lower end of the tube located at the lowermost end of the tube of the multi-stage is fixed to the outermost of the upper surface of the gate 133, wherein the lower end of the tube is located on the outer side of the upper opening of the injection hole 135 will be described later Air supplied from the air supply pipe (300a) is introduced through the inside of the upper portion of the injection hole 135 is preferably injected to the outside of the gate 133 through the side of the injection hole (135).

In addition, the vacuum hopper 100 further includes an air supply pipe 300a that penetrates an upper surface of the vacuum hopper 100 and supplies air to the inside of the cover part 140.

Therefore, as the air supplied to the air supply pipe 300a is injected through the injection hole 135 formed in the gate 133, an additive attached to the outer circumferential surface of the gate 133 or the inner circumference of the outlet 120 is formed. Drop out.

As shown in FIG. 2, the subhopper 200 in which additives are primarily stored may be further connected to the inlet 110 of the vacuum hopper 100.

Like the vacuum hopper 100, the subhopper 200 is an enclosure in which additives are stored, and has a shape that is substantially narrower, and a sub inlet 210 into which an additive is introduced is formed on an upper surface thereof. A sub discharge port 220 for discharging the additive is formed. Thus, as the sub outlet 220 and the inlet 110 of the vacuum hopper 100 are connected, the additive stored in the sub hopper 200 is filled into the vacuum hopper 100.

The subhopper 200 has a subcylinder 231 and a sub corresponding to the cylinder 131, the gate 133, and the cover 140 of the vacuum hopper 100 to open and close the sub outlet 220. The gate 233 and the sub cover part 240 are configured. In this case, since the configuration and operation of the subcylinder 231, the subgate 233, and the subcover part 240 are the same as those of the cylinder 131, the gate 133, and the cover part 140 of the vacuum hopper 100. Detailed description will be omitted.

In addition, the upper surface of the sub-hopper 200 in the same manner as the air supply pipe 300a provided in the vacuum hopper 100 to supply air to the inside of the sub-cover portion 240 to be injected through the injection hole 235 It is further provided with an air supply pipe 300b extending through the sub cover part 240.

Referring to the state of use of the additive input device of the vacuum degassing equipment according to the present invention configured as described above are as follows.

5a and 5b is an operating state diagram showing the operating state of the additive input device of the vacuum degassing equipment according to the present invention.

As shown in FIG. 5A, when the additive is transported by the transportation device and stored in the subhopper 200 through the inlet 110 of the subhopper 200, the inlet 110 of the subhopper 200 is closed. Then, when the cylinder rod 231a is raised by operating the subcylinder 231, the subgate 233 is integrally raised to open the sub discharge port 220, and the additive is filled into the vacuum hopper 100 by its own weight. .

When the additive is filled with the appropriate amount of vacuum hopper 100, the sub-cylinder 231 is operated to lower the cylinder rod 231a so that the sub-gate 233 closes the sub-discharge port 220. At this time, when the air is supplied to the inside of the sub cover part 240 through the air supply pipe 300b, the supplied air is injected through the injection hole 235, and the inner circumferential surface of the sub gate 233 and the inner periphery of the sub discharge port 220 are provided. The additive attached to the dropout is removed to maintain the airtightness between the subgate 233 and the sub outlet 220.

When the sub gate 233 blocks the sub outlet 220 so that the vacuum hopper 100 is sealed, the inside of the vacuum hopper 100 is maintained in a vacuum state through the vacuum pipe 150.

Then, as shown in FIG. 5B, the cylinder 131 is operated to raise the gate 133 to open the outlet 120. Then, the additive filled in the vacuum hopper 100 is supplied to the inside of the vacuum chamber by its own weight through the discharge port 120 is introduced into the molten steel.

When the addition of the additive is completed, the cylinder 131 is operated to lower the gate 133 to close the outlet 120.

In this case, air is supplied through the air supply pipe 300a as in the case where the sub gate 233 is operated, and the supplied air is injected through the injection hole 135 formed in the gate 133. The outer circumferential surface and the outlet 120 is dropped off the additive attached to the inner circumference to maintain the airtight between the gate 133 and the outlet 120.

As such, the vacuum hopper 100 is preferably sealed by keeping the airtight between the gate 133 and the outlet 120, and the sub gate 233 and the sub outlet 220, so that the vacuum hopper 100 can be easily vacuumed. I can keep it.

In addition, when additives are added to the subhopper 200 and the vacuum hopper 100, the cylinder cylinders 231a and 131a of the subcylinder 231 and the cylinder 131 are connected to the subcover part 240 and the cover part 140. And the damage is prevented, and the sub cover part 240 and the cover part 140 are stretched in an antenna manner to prevent the cylinder rod from being hit by the additive when the gate 133 and the sub gate 233 are raised and lowered. 231a, 131a).

As described above, according to the present invention is provided with a cover portion for protecting the cylinder rod for operating the gate of the vacuum hopper and the sub-hopper has an effect of preventing damage and damage to the gate.

In addition, air is injected along the outer circumferential surface of the gate to drop off additives attached to the outer circumferential surface of the gate and the inner circumference of the outlet so that the airtightness of the gate and the outlet is maintained so that the vacuum balance of the vacuum hopper can be easily maintained.

Claims (7)

In the apparatus for adding an additive to the molten steel in the vacuum chamber in the vacuum degassing equipment, A vacuum hopper having an inlet through which the additive is introduced and an outlet through which the outlet is discharged, the outlet being connected to a vacuum chamber; An opening and closing portion having a cylinder installed at the vacuum hopper and a cylinder rod installed at the cylinder rod of the cylinder to open and close the outlet of the vacuum hopper; And It is composed of a multi-stage tube that is stretched in the antenna type is installed to surround the cylinder rod of the cylinder, the additive injection device of the vacuum degassing equipment comprising a cover unit which is integrally stretched by the operation of the cylinder rod. The method of claim 1, It is connected to the inlet of the vacuum hopper, further comprising a sub-hopper for introducing the additive into the vacuum hopper, The subhopper has a sub inlet through which the additive is introduced and a sub outlet connected to the inlet of the vacuum hopper, The sub discharge port is opened and closed by a sub gate installed on the cylinder rod of the sub cylinder, Additives of the vacuum degassing equipment, characterized in that it is composed of a multi-stage tube that is stretched antenna type to surround the cylinder rod of the sub-cylinder, the sub-cover portion is integrally stretched by the operation of the cylinder rod Dosing device. The method according to claim 1 or 2, Injection holes are formed along side ends of the gates or subgates, and an air supply pipe through the vacuum hopper or the subhoppers to supply air into the cover portion or the sub cover portion is further provided. The additive input device of the vacuum degassing equipment, characterized in that the air supplied to the air supply pipe is injected through the injection hole. The method of claim 3, wherein The gate or sub-gate additive injection device of the vacuum degassing equipment, characterized in that the gate packing is installed along the outer peripheral surface of the lower surface. delete The method according to claim 1 or 2, Addition device of the vacuum degassing equipment, characterized in that the tube packing is installed in the contact portion that the tubes of the multi-stage contact each other. The method of claim 1, The vacuum hopper is added to the vacuum degassing equipment, characterized in that the vacuum pipe for adjusting the vacuum balance therein is further provided.

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