CN113046517A - Safe and environment-friendly scrap steel adding device for blast furnace hot-metal bottle - Google Patents
Safe and environment-friendly scrap steel adding device for blast furnace hot-metal bottle Download PDFInfo
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- CN113046517A CN113046517A CN202110306287.0A CN202110306287A CN113046517A CN 113046517 A CN113046517 A CN 113046517A CN 202110306287 A CN202110306287 A CN 202110306287A CN 113046517 A CN113046517 A CN 113046517A
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- Prior art keywords
- receiving hopper
- hopper
- environment
- blast furnace
- scrap steel
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
Abstract
The invention discloses a safe and environment-friendly scrap steel adding device for a blast furnace hot metal ladle, which comprises a charging hopper, a receiving hopper, a material guide pipe and a material guide pipe angle adjusting device, wherein the charging hopper is hung on a steel wire rope of a crown block, the receiving hopper is fixed on a cast house platform through a foot rest, a feeding hole in the upper part of the receiving hopper is opposite to a discharging hole of the charging hopper, a material flow valve is arranged at a discharging hole in the lower part of the receiving hopper, the material guide pipe is positioned below the receiving hopper, an upper opening of the material guide pipe is opposite to the discharging hole of the receiving hopper and is rotatably connected with the receiving hopper through a connecting plate, a lower opening of the material guide pipe is opposite to a tank opening of a molten iron torpedo tank. According to the invention, firstly, the scrap steel is put into the receiving hopper, and then the material flow valve is used for controlling the scrap steel to flow into the molten iron in the molten iron torpedo tank through the material guide pipe according to the set material flow speed, so that not only can the explosion accident caused by the overlarge once addition of the scrap steel be avoided, but also the instantaneous generation amount of smoke dust can be reduced, and the environmental pollution is avoided.
Description
Technical Field
The invention relates to a device for adding scrap steel into a blast furnace molten iron tank, belonging to the technical field of metallurgical equipment.
Background
With the development of economic society, the production amount of scrap steel is gradually increased, and the recycling method of the scrap steel is also increased continuously. The method is a new method adopted in recent years, wherein small pieces of scrap steel are directly added into an iron tank containing molten iron, the scrap steel is soaked, heated and melted by high-temperature molten iron, and is mixed with the molten iron in the tank to form new molten iron, and then the new molten iron is supplied to the next procedure for steelmaking. The method can quickly and economically increase the supply of the molten iron, has wide application, but because the height of the molten iron tank is about ten meters, when adding the scrap steel, the scrap steel needs to be hoisted by means of large-scale equipment such as a hook machine, a crown block and the like, and then is slowly added into the molten iron in the tank, and the scrap steel adding mode has a plurality of defects: firstly, when the scrap steel is added, the high-temperature molten iron is very easy to explode at the moment of contacting with the scrap steel, and especially when a large-scale machine is used for one-time addition, the explosion is easier; secondly, the molten iron in the tank rolls after the scrap steel is added, the smoke and dust generation amount is large, and large machinery needs a wider field, so that the on-site smoke and dust is not collected well, and the environment is easily polluted; finally, most of the added scrap steel is bulk materials which cannot be hoisted in large quantity every time and are easy to spill, so that the labor intensity of workers is greatly increased. Therefore, it is necessary to design a scrap adding device which can prevent explosion accidents, avoid the pollution of smoke and dust to the environment and reduce the labor intensity of workers.
Disclosure of Invention
The invention aims to provide a safe and environment-friendly scrap adding device for a blast furnace hot metal ladle, aiming at the defects of the prior art so as to prevent explosion accidents and avoid environment pollution caused by smoke dust.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a device is added to safe environment-friendly steel scrap of blast furnace hot-metal bottle, includes charging hopper, passage and passage angle adjusting device, the charging hopper hangs on overhead traveling crane wire rope, the hopper passes through the foot rest to be fixed on the cast house platform, and the feed inlet on hopper upper portion is relative with the discharge gate of charging hopper, and lower part discharge gate department is equipped with the material flow valve, the passage is located the below of hopper, and the last mouthful of passage is relative with the discharge gate of hopper and rotate with the hopper through the connecting plate and be connected, and the end is relative with the jar mouth of molten iron torpedo jar, passage angle adjusting device is connected with the passage.
The safe and environment-friendly scrap steel adding device for the blast furnace hot-metal bottle further comprises an air draft dust removing device, and an air draft inlet of the air draft dust removing device is positioned above the hot-metal torpedo bottle.
According to the safe and environment-friendly waste steel adding device for the blast furnace molten iron tank, the sealing valve is arranged below the material flow valve and comprises a left half valve plate and a right half valve plate which are symmetrically arranged on two sides of the central line of the discharge port of the receiving hopper, each half valve plate is rotatably connected with the side wall of the receiving hopper through the horizontal rotating shaft, one end of each half valve plate, which is located on the inner side of the receiving hopper, can rotate upwards to the central line of the discharge port, and the other end, which is located on the outer side of the receiving hopper, is provided with the balancing weight, so that the two half valve.
The safe and environment-friendly scrap steel adding device of the blast furnace hot metal ladle is characterized in that the receiving hopper is provided with a material level measuring device, the material level measuring device comprises a material level meter sealing cover and a material level meter, the material level meter sealing cover is a vertical long pipe, the lower end of the material level meter sealing cover is flush with the discharge port of the lower part of the receiving hopper, the upper end of the material level meter sealing cover is sealed and is higher than a furnace platform, the material level meter is fixed on the material level meter sealing cover, and a probe of the material level meter is inserted into a measuring hole in the middle of.
The safe and environment-friendly waste steel adding device for the blast furnace hot metal ladle is characterized in that the guide pipe angle adjusting device is a hand winch, the hand winch comprises a non-return pawl, a crank, a ratchet wheel, a rope winding shaft and a winding steel wire rope, the rope winding shaft is rotatably connected with the material level meter sealing cover, the crank is fixed at one end of the rope winding shaft, the winding steel wire rope is wound on the rope winding shaft, two ends of the winding steel wire rope are respectively connected with two ends of an upper opening of the guide pipe, the ratchet wheel is fixed on the rope winding shaft, the non-return pawl is rotatably connected with the material level meter sealing cover, and a claw tip of the non-return pawl is opposite to teeth on the ratchet wheel.
According to the safe and environment-friendly scrap steel adding device for the blast furnace hot-metal bottle, the section of the material guide pipe is rectangular, the vertical short pipe with the section shape consistent with that of the material guide pipe is arranged at the discharge outlet at the lower part of the receiving hopper, the material guide pipe is movably connected with the vertical short pipe through the connecting plate, and the material flow valve and the sealing valve are both arranged on the vertical short pipe.
According to the safe and environment-friendly scrap steel adding device for the blast furnace hot-metal bottle, the material flow valve comprises a horizontal valve plate, and the valve plate is inserted into a slot at a discharge outlet at the lower part of the receiving hopper.
The charging hopper is a cuboid-shaped hollow hopper, the upper part of the charging hopper is provided with a charging opening, the front part of the charging hopper is provided with a discharging opening, the rear part of the charging hopper is provided with a rear lug, the left side and the right side of the charging hopper are provided with side lugs, and the rear lug and the side lugs are connected with a crown block steel wire rope.
According to the safe and environment-friendly scrap steel adding device for the blast furnace hot metal bottle, the fixed pulley is arranged on the vertical short pipe at the discharge outlet of the receiving hopper, and the hoisting steel wire rope bypasses the fixed pulley and is connected with the material guide pipe.
According to the safe and environment-friendly scrap steel adding device for the blast furnace hot metal ladle, the section of the material level indicator sealing cover is rectangular.
According to the invention, firstly, the scrap steel is put into the receiving hopper, and then the material flow valve is used for controlling the scrap steel to flow into the molten iron in the molten iron torpedo tank through the material guide pipe according to the set material flow speed, so that not only can the explosion accident caused by the overlarge once addition of the scrap steel be avoided, but also the instantaneous generation amount of smoke dust can be reduced, and the environmental pollution is avoided.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a three-dimensional view of the charging hopper, in which fig. 2 (a) is a front view, fig. 2 (b) is a left side view, and fig. 2 (c) is a plan view;
FIG. 3 is a top view of the receiving hopper;
fig. 4 is a view showing three states of the material guiding device, in which fig. 4 (a) shows the material guiding tube in a vertical state, fig. 4 (b) shows the material guiding tube in a left-hand state, and fig. 4 (c) shows the material guiding tube in a right-hand state;
fig. 5 is a schematic structural view of the material flow valve, wherein fig. 5 (a) is a front view and fig. 5 (b) is a left view;
fig. 6 is a schematic structural view of the sealing valve, wherein fig. 6 (a) shows a state where the sealing valve is closed, and fig. 6 (b) shows a state where the sealing valve is opened;
fig. 7 is a schematic structural view of a guide tube angle adjusting device, in which fig. 7 (a) is a front view and fig. 7 (b) is a top view.
The reference numbers in the figures are as follows: 1. the device comprises a receiving hopper, 2, a material level gauge, 3, a non-return pawl, 4, a crank, 5, a hand winch, 6, a material level gauge sealing cover, 7, a fixed pulley, 8, a winch steel wire rope, 9, a foot rest, 10, a material flow valve, 11, a sealing valve, 11-1, a half valve plate, 11-2, a horizontal rotating shaft, 11-3, a balancing weight, 12, a connecting plate, 13, a guide pipe, 14, a crown block steel wire rope, 15, a rear lug, 16, a charging hopper, 17, scrap steel, 18, a side lug, 19, a casting house platform, 20, an air draft dust removal device, 21, a molten iron torpedo tank, 22, molten iron, 23, a ratchet wheel, 24 and a rope winding shaft.
Detailed Description
The invention provides a safe and environment-friendly scrap steel adding device for a blast furnace hot-metal bottle, which is not easy to explode when adding scrap steel, does not raise dust on site, has small workload and ensures that the work of adding the scrap steel is safe, environment-friendly and easy.
Referring to the attached figure 1, the invention mainly comprises a charging hopper 16, a receiving hopper 1 with a material flow valve 10 and a sealing valve 11 arranged at the bottom of the receiving hopper, a hand-operated winch 5, an air draft dust collector 20 and a material guide pipe 13, wherein the material guide pipe 13 can be swung to a required position by the hand-operated winch 5 with a ratchet wheel through a winch steel wire rope.
Referring to the attached drawings 1 and 2, the charging hopper 16 is a cuboid-like inner hollow hopper, a bottom plate, a left side plate, a right side plate and a rear side plate are made of steel plates and welded together, a discharge port is formed in the front side of the inner hollow hopper, a material is filled in the upper portion of the inner hollow hopper, side hanging lugs 18 are welded on the outer sides of the left side plate and the right side plate, and a rear hanging lug 15 is welded on the rear portion of the rear side plate. When the device is used, the rear lugs 15 and the side lugs 18 of the charging hopper 16 are hung on the crown block steel wire rope 14, and the waste steel 17 in the charging hopper 16 is directly hoisted and poured into the receiving hopper 1.
Referring to fig. 3 to 6, the upper part of the receiving hopper 1 is in the shape of an inverted quadrangular frustum pyramid, the lower part of the frustum pyramid is connected with a vertical short pipe with a rectangular cross section to form a discharge port, and the upper end of the vertical short pipe is provided with a movable valve plate which can be checked to form a material flow valve 10 for controlling the material flow speed; a sealing valve 11 is arranged below the material flow valve 10, the sealing valve 11 comprises a left half valve plate 11 and a right half valve plate 11-1, each half valve plate 11-1 is rotatably connected with the side wall of the receiving hopper 1 through a horizontal rotating shaft 11-2, a balancing weight 11-3 is arranged at one end extending out of the receiving hopper 1, under the normal condition, under the gravity action of the balancing weight 11-3, the two half valve plates 11-1 rotate to the involutory position, so that the sealing valve 11 is in a closed state, and during blanking, the two half valve plates 11-1 rotate to a separated state under the pressure action of the scrap steel 17, so that the sealing valve 11 is opened. The utility model discloses a receiving hopper 1, the vertical nozzle stub left and right sides intermediate position installation swing joint board 12 in bottom, a passage 13 for connect the below, two fixed pulleys 7 that pull hoist wire rope are installed to vertical nozzle stub left and right sides both ends position, the rear portion of receiving hopper 1 is equipped with a charge level indicator sealed cowling 6, be used for installing charge level indicator 2, charge level indicator sealed cowling 6 is a vertical long tube, its lower extreme and the vertical nozzle stub parallel and level of receiving hopper 1 bottom, the upper end is higher than about the stove platform 60cm, cross sectional shape is rectangle, vertical long tube upper end is sealed, be used for fixed charge level indicator 2, a round hole is opened to the centre, just in time can insert the probe of charge level indicator.
The hand winch 5 and the material guide pipe 13 form a material guide device, the material guide pipe 13 is a long pipe capable of swinging, the cross section of the material guide pipe is rectangular, the cross section size of the long pipe is consistent with that of a vertical short pipe at the bottom of the material receiving hopper 1, the middle positions of the left side and the right side are movably connected with the vertical short pipe at the bottom of the material receiving hopper 1 through the movable connecting plate 12, and rope holes are reserved at the two ends of the left side or the right side of the upper opening of the material guide pipe 13 and used. Hand hoist engine 5 installs on charge level indicator sealed cowling 6 left side or right side, including non return pawl 3, crank 4, ratchet 23, rope winding axle 24 and hoist wire rope 8, rope winding axle 24 rotates with charge level indicator sealed cowling 6 to be connected, crank 4 is fixed in the one end of rope winding axle 24, hoist wire rope 8 winds on rope winding axle 24, its both ends are connected with passage 13, ratchet 23 is fixed on rope winding axle 24, non return pawl 3 is fixed on charge level indicator sealed cowling 6, the claw point of non return pawl 3 is relative with the tooth on the ratchet 23. When the crank handle 4 is cranked, the hoisting steel wire rope 8 can be pulled by the rope winding shaft 24, and the material guide pipe 13 is adjusted to a required position.
During tapping, when the air draft dust removal device 20 above the molten iron torpedo tank 21 is opened, firstly, the discharge hole of the material guide pipe 13 is aligned with the tank opening of the molten iron torpedo tank 21 through the hand-operated winch 5, then, the scrap steel in the charging hopper 16 is poured into the receiving hopper 1, then, the opening of the material flow valve 10 is opened and controlled, the seal valve 11 is pressed open by the scrap steel under the action of gravity, and the scrap steel directly flows into the molten iron 22 in the molten iron torpedo tank 21 through the material guide pipe 13 according to the required material flow speed. In the process of adding the scrap steel 17, the air draft dust removal device 20 continuously conducts air draft, the material guide pipe 13 below the sealing valve 11 and the material level meter 2 of the material level meter sealing cover 6 are both in a negative pressure state, the smoke and dust are prevented from overflowing, and the field environment is protected. After the scrap steel is added, the material flow valve 10 is closed, and the sealing valve 11 is automatically closed.
In any process of adding the scrap steel 17, the crank handle 4 can be shaken to rotate the hand-operated winch 5 with the ratchet wheel, the hand-operated winch can rotate forwards or backwards, the material guide pipe 13 below the movable connecting plate 12 is adjusted to a required position through the winch steel wire rope 8, the non-return pawl 3 is stirred after the adjustment is finished, and the hand-operated winch 5 is fixed.
In this embodiment, each blast furnace is provided with 4 to 10 charging hoppers according to the charging amount and the frequency of use of the scrap steel, the external dimension of each charging hopper is 1 length, width and height, about 2m, 1m, 0.5m, each charging hopper can be filled with about 5 tons of scrap steel and is formed by welding 20mm steel plates, and the front end can be designed into a necking shape so as to be convenient for pouring the scrap steel 17 into the receiving hopper 1. Lifting lugs are welded on three sides of the charging hopper, so that a crown block steel wire rope 14 can be hung conveniently. During loading, the loading hopper 16 pours the scrap steel into the receiving hopper 1 under the hoisting of the crown block steel wire rope 14, so that the large-scale hoisting is realized.
According to the number of the tapholes, each blast furnace is provided with 12 to 6 receiving hoppers, and the tapholes to be overhauled can be not matched. When the device is installed, the material guide pipe 13 is directly inserted into a material inlet above the molten iron torpedo ladle 21, and the receiving hopper is directly supported on the casting house platform 19 through the foot rest 9. The receiving hopper is in a shape similar to a chamfered table, and the position close to the charging hopper is slightly lower, so that the waste steel 17 can be poured conveniently. When adding scrap steel 17, the size of the opening of the material flow valve 10 can be adjusted according to the needs, and the material flow speed is ensured to be proper.
The material guide pipe 13 is connected with the material receiving hopper 1 through the movable connecting plate 12, the material guide pipe 13 can swing left and right flexibly, the crank 4 can be shaken to rotate the hand-operated winch 5 with the ratchet wheel at any time when the scrap steel 17 is added, the material guide pipe 13 is swung to the optimal position, the non-return pawl 3 is shifted to lock the hand-operated winch 5 after the material guide pipe is swung, and the scrap steel 17 is guided to the position required in the molten iron torpedo tank.
The invention changes the operation of adding the scrap steel into the blast furnace iron tank with high labor intensity and hidden danger of safety and environmental pollution into time and labor saving, safety and environmental protection. The whole bucket of scrap steel is directly added into the iron tank by using the crown block, so that time and labor are saved, and the adding amount can be increased; the scrap steel is dispersed, batched and added into the molten iron torpedo tank at the required speed, so that the risk of centralized addition of explosion is reduced; the negative pressure in the device is ensured through the dust removal system, the smoke pollution is avoided, and the field environment is improved.
Claims (10)
1. The utility model provides a safe environment-friendly steel scrap of blast furnace hot metal bottle adds device, characterized by, including charging hopper (16), receiving hopper (1), passage (13) and passage angle adjusting device, charging hopper (16) are hung on overhead traveling crane wire rope (14), receiving hopper (1) is fixed on casting house platform (19) through foot rest (9), and the feed inlet on receiving hopper (1) upper portion is relative with the discharge gate of charging hopper (16), and lower part discharge gate department is equipped with material flow valve (10), passage (13) are located the below of receiving hopper (1), and the upper shed of passage (13) is relative with the discharge gate of receiving hopper (1) and rotate with receiving hopper (1) through connecting plate (12) and be connected, and the end opening is relative with the jar mouth of molten iron torpedo jar (21), passage angle adjusting device is connected with passage (13).
2. The safe and environment-friendly scrap steel adding device for the blast furnace hot-metal bottle as claimed in claim 1, which is characterized by further comprising an air draft dust removing device (20), wherein an air suction opening of the air draft dust removing device (20) is positioned above the hot-metal torpedo bottle (21).
3. The safety and environment-friendly scrap steel adding device for the blast furnace hot-metal ladle as claimed in claim 1 or 2, wherein the sealing valve (11) is arranged below the material flow valve (10), the sealing valve (11) comprises a left half valve plate and a right half valve plate (11-1), the left half valve plate and the right half valve plate are symmetrically arranged on two sides of a central line of the discharge hole of the receiving hopper (1), each half valve plate (11-1) is rotatably connected with the side wall of the receiving hopper (1) through a horizontal rotating shaft (11-2), one end of each half valve plate (11-1) located on the inner side of the receiving hopper (1) can rotate upwards to the central line of the discharge hole, and one end located on the outer side of the receiving hopper (1) is provided with a balancing weight (11-3), so that the two half valve plates (11-1) close the discharge hole under.
4. The safe and environment-friendly scrap steel adding device for the blast furnace hot-metal bottle as claimed in claim 3, wherein the receiving hopper (1) is provided with a material level measuring device, the material level measuring device comprises a material level meter sealing cover (6) and a material level meter (2), the material level meter sealing cover (6) is a vertical long pipe, the lower end of the vertical long pipe is flush with the discharge hole at the lower part of the receiving hopper (1), the upper end of the vertical long pipe is closed and higher than a furnace platform, the material level meter (2) is fixed on the material level meter sealing cover (6), and the probe of the material level meter (2) is inserted into the measuring hole at the middle part of the upper end of the material level meter sealing cover (6).
5. The safe and environment-friendly scrap steel adding device for the blast furnace hot-metal ladle as claimed in claim 4, wherein the guide pipe angle adjusting device is a hand winch (5), the hand winch (5) comprises a non-return pawl (3), a crank (4), a ratchet wheel (23), a rope winding shaft (24) and a winding steel wire rope (8), the rope winding shaft (24) is rotatably connected with the material level meter sealing cover (6), the crank (4) is fixed at one end of the rope winding shaft (24), the winding steel wire rope (8) is wound on the rope winding shaft (24), two ends of the winding steel wire rope are respectively connected with two ends of the upper opening of the guide pipe (13), the ratchet wheel (23) is fixed on the rope winding shaft (24), the non-return pawl (3) is rotatably connected with the material level meter sealing cover (6), and a claw tip of the non-return pawl (3) is opposite to teeth on the ratchet wheel (23).
6. The safety and environment-friendly scrap adding device for the blast furnace hot-metal bottle as claimed in claim 5, wherein the cross-sectional shape of the material guiding pipe (13) is rectangular, a vertical short pipe with the same cross-sectional shape as the material guiding pipe (13) is arranged at the discharge outlet at the lower part of the receiving hopper (1), the material guiding pipe (13) is movably connected with the vertical short pipe through a connecting plate (12), and the material flow valve (10) and the sealing valve (11) are both arranged on the vertical short pipe.
7. The safety and environment-friendly scrap adding device for the blast furnace hot-metal ladle as claimed in claim 6, wherein the material flow valve (10) comprises a horizontal valve plate which is inserted into an insertion groove at the discharge outlet at the lower part of the receiving hopper (1).
8. The safety and environment-friendly scrap adding apparatus for a blast furnace hot-metal ladle according to claim 7, wherein said charging hopper (16) is a rectangular parallelepiped shaped inner hopper, and has a charging port at the upper part, a discharging port at the front part, a rear lug (15) at the rear part, side lugs (18) at the left and right sides, said rear lug (15) and side lugs (18) being connected to a crown block wire rope (14).
9. The safety and environment-friendly scrap adding device for the blast furnace hot-metal ladle as claimed in claim 8, wherein the vertical short pipe at the discharge port of the receiving hopper (1) is provided with a fixed pulley (7), and the hoisting steel wire rope (8) is connected with the material guiding pipe (13) by passing around the fixed pulley (7).
10. The safe and environment-friendly scrap steel adding apparatus for a blast furnace hot-metal ladle according to claim 9, wherein the cross-sectional shape of the level gauge sealing cover (6) is rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306287.0A CN113046517A (en) | 2021-03-23 | 2021-03-23 | Safe and environment-friendly scrap steel adding device for blast furnace hot-metal bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110306287.0A CN113046517A (en) | 2021-03-23 | 2021-03-23 | Safe and environment-friendly scrap steel adding device for blast furnace hot-metal bottle |
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| Publication Number | Publication Date |
|---|---|
| CN113046517A true CN113046517A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110306287.0A Pending CN113046517A (en) | 2021-03-23 | 2021-03-23 | Safe and environment-friendly scrap steel adding device for blast furnace hot-metal bottle |
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| CN (1) | CN113046517A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114921601A (en) * | 2022-07-22 | 2022-08-19 | 徐州永冠铸业有限公司 | Scrap steel adding device for smelting molten iron |
-
2021
- 2021-03-23 CN CN202110306287.0A patent/CN113046517A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114921601A (en) * | 2022-07-22 | 2022-08-19 | 徐州永冠铸业有限公司 | Scrap steel adding device for smelting molten iron |
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