CN215251000U - RH furnace roof rifle seals gasbag protection device and RH vacuum furnace - Google Patents
RH furnace roof rifle seals gasbag protection device and RH vacuum furnace Download PDFInfo
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- CN215251000U CN215251000U CN202120548552.1U CN202120548552U CN215251000U CN 215251000 U CN215251000 U CN 215251000U CN 202120548552 U CN202120548552 U CN 202120548552U CN 215251000 U CN215251000 U CN 215251000U
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Abstract
The utility model provides a RH furnace top gun sealing air bag protection device and a RH vacuum furnace, which comprises a heat insulation plate, a connecting device and a fixing device; the heat insulation plate is circular, one end of the connecting device is connected to the center of the heat insulation plate, and the other end of the connecting device is connected to the fixing device; the diameter of the heat insulation plate is smaller than that of the top lance sealing channel; the length of the connecting device is smaller than that of the top lance sealing channel and is simultaneously larger than that from the top end of the top lance sealing channel to the lower end of the sealing air bag. The utility model discloses simple, practical is applied to and protects sealed gasbag under the high temperature environment, avoids high temperature steam to bake bad cortex sealed gasbag, carries out molten steel circulation under the high temperature vacuum environment and handles solid guarantee effect.
Description
Technical Field
The utility model belongs to the field of ferrous metallurgy steelmaking, concretely relates to RH furnace roof rifle seals gasbag protection device and RH vacuum furnace.
Background
The RH vacuum furnace is used as main smelting equipment for refining process, and the process is mainly characterized in that molten steel is treated in a vacuum environment, and the requirement on the vacuum degree is very strict; the sealing of each link of the vacuum system can greatly influence the vacuum degree, the top lance system is used as main equipment in the smelting process of the RH furnace, the main functions are baking the vacuum tank, heating molten steel, forced decarburization and cold steel removal of the vacuum tank, and the use frequency is relatively frequent.
In order to solve the high-temperature sealing problem between the top lance and the vacuum groove in the vacuum treatment and heating working processes, Chinese patent document CN201024186Y (CN200720066221.4) provides a molten steel vacuum refining multifunctional top lance sealing protection device, which solves the problem that a sealing air bag and a sealing packing are burnt out, realizes normal sealing in a vacuum treatment state, has a simple structure, greatly prolongs the service life of equipment, and reduces the production and maintenance cost. This patent only addresses the problem of sealing between the top gun and the sealing bladder.
However, when the top lance is replaced due to water leakage, when the tip hole of the top lance is clogged, or when the top lance is stopped, the top lance needs to be pulled out of the vacuum tank and separated from the sealing air bag. At the moment, the sealed air bag is completely exposed to the environment of high-temperature gas, the sealed air bag is very easy to damage, if the sealed air bag is not found in time, the air leakage caused by poor sealing can occur during vacuum treatment, and the vacuum degree cannot meet the technical requirement. Even if the sealed air bag can be found in time and replaced, a large amount of time is still spent for processing, and the whole production is adversely affected. Therefore, it is desirable to provide a device for protecting the sealing airbag of the top lance when the top lance is detached from the sealing airbag under high temperature environment.
Further, the circulation flow rate of the RH vacuum furnace can most directly exhibit the refining efficiency of RH. The circulation flow is increased, the RH processing capacity can be improved, and the uniformity and the purity of the components of the molten steel are enhanced, so that the quality of the molten steel is improved and stabilized. The size and the flow of the air blowing hole of the dip pipe are the most direct dynamic influence key factors of the circulation flow, so the air blowing hole of the dip pipe becomes an important part concerned by technical personnel of the vacuum refining furnace; the blowing holes are blocked due to the fact that a large amount of molten steel and steel slag flow in an ascending pipe of the dip pipe in the circulation process of the vacuum furnace, or the situation that the steel slag in the baking process of the vacuum tank flows out after being melted to block the blowing holes of the dip pipe occurs sometimes, and great troubles are brought to the management and control of the production process. Therefore, it is required to provide an anti-blocking device for the blowing hole of the dip pipe of the RH furnace.
Disclosure of Invention
One of the purposes of the utility model is to provide a RH furnace top rifle seals gasbag protection device. The sealing air bag is prevented from being roasted by high-temperature hot gas after the top lance is separated from the sealing channel, and the sealing air bag plays an important role in the stable production operation of the RH furnace and the guarantee of the sealing performance of a vacuum system.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a RH furnace top gun sealing air bag protection device comprises a heat insulation plate, a connecting device and a fixing device; the heat insulation plate is circular, one end of the connecting device is connected to the center of the heat insulation plate, and the other end of the connecting device is connected to the fixing device; the diameter of the heat insulation plate is smaller than that of the top lance sealing channel; the length of the connecting device is smaller than that of the top lance sealing channel and is simultaneously larger than that from the top end of the top lance sealing channel to the lower end of the sealing air bag.
Preferably, the fixing device is a steel bar. Further preferably, the length of the steel strip is greater than the diameter of the top lance sealing channel.
Preferably, the connecting device is a chain. The chain is selected to connect the heat insulation plate and the fixing device, so that the taking and the placing in the sealing channel are facilitated.
Preferably, the diameter of the heat insulation plate is 2-4 cm smaller than that of the top lance sealing channel. When the thickness is less than 2mm, the clearance between the heat insulation plate and the sealing channel is too small, so that the heat insulation plate is not beneficial to taking and placing, and the asbestos is not beneficial to stuffing and compacting; when the diameter is larger than 4mm, the gap between the heat insulation plate and the sealing channel is too large, so that the stone wool is easy to fall into the groove when being plugged, and the gap is not filled conveniently.
Preferably, the heat insulation plate is a steel plate, and the thickness of the heat insulation plate is 2-3 mm.
The utility model also provides an RH vacuum furnace, which comprises a vacuum groove, a hot bent pipe for exhausting and an alloy material charging port for charging; the hot bent pipe and the alloy charging opening are both connected with the vacuum tank;
the dip pipe is positioned at the bottom of the vacuum tank and comprises a molten steel ascending pipe, a molten steel descending pipe and a blowing pipeline connected to the inner wall of the ascending pipe;
the top lance, the top lance sealing channel and the top lance sealing air bag play a role in sealing;
the protection device prevents the sealing air bag from being damaged when the top lance is lifted out of the sealing channel of the top lance;
the protection device comprises a heat insulation plate, a chain for connecting and a steel bar for fixing; the heat insulation plate is circular, one end of the chain is connected to the center of the heat insulation plate, and the other end of the chain is connected to the center of the steel bar; the length of the steel bar is greater than the diameter of the top lance sealing channel; the diameter of the heat insulation plate is smaller than that of the top lance sealing channel; the length of the chain is less than that of the top lance sealing channel and is greater than that from the top end of the top lance sealing channel to the lower end of the sealing air bag;
and asbestos used for filling the gap between the heat insulation plate and the sealing channel is also included.
Preferably, the thickness of the asbestos is 2-3 mm.
RH furnace roof rifle seals gasbag protection device, when the top rifle needs processing such as maintenance, the top rifle proposes the sealed passageway of top rifle, and sealed gasbag receives the roast of the high temperature steam that comes from vacuum tank, hot return bend this moment. In order to avoid burning out of the sealing air bag, the protection device is immediately placed into the top gun sealing channel, and meanwhile asbestos is filled in a gap between the protection device heat insulation plate and the top gun sealing channel. The device has effectually blocked high temperature steam, has avoided destroying sealed gasbag's emergence, has solved the sealing stability of sealed passageway sealed gasbag under the high temperature environment, reduces sealed gasbag and burns out the frequent change scheduling problem because of the high temperature.
The method for quickly protecting the top lance sealing air bag in the high-temperature environment based on the protection device comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; the heat insulation plate is hung in the sealing channel by using a chain, the length of the chain is less than that of the top gun sealing channel and is greater than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
After the heat insulation plate is pulled out, a part of asbestos falls into the ground from the vacuum tank dip pipe, and a part of asbestos falls into the tank, is melted during baking or RH treatment, and has no influence on the quality of molten steel.
The utility model discloses a solve the easy problem of blockking up of gas blow pipe simultaneously, the lateral wall of the gas blow pipe of above-mentioned RH vacuum furnace is connected with oxygen branch pipe and pressure sensor. And in the gap between the top lance and the top lance, the outlet of the blowing pipeline is blown through by introducing oxygen. Because the reaction is stopped just before, the dipping pipe is in a high-temperature state, and oxygen is introduced at the moment, the oxygen can react with the steel slag blocked at the air blowing hole, so that the steel slag is melted, and the melted steel slag falls from the air blowing hole under the pushing of the oxygen with certain pressure.
A method for removing steel slag in a blowing hole of a dip pipe of an RH furnace in a top lance maintenance and replacement clearance comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; the heat insulation plate is hung in the sealing channel by using a chain, the length of the chain is less than that of the top gun sealing channel and is greater than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top lance is maintained and replaced, the gas in the blowing pipeline is replaced by oxygen for blowing through, the oxygen pressure is 1.0-1.5 Mpa, and the blowing through is stopped until no steel slag falls;
4) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain firstly, the top gun descends into the vacuum groove, the sealing air bag normally works according to the linkage of the top gun, and meanwhile, gas in the blowing pipeline is replaced by argon.
The method can blow through the air blowing opening of the dip pipe while maintaining and replacing the top lance, so that the dip pipe can be blown through in time, the blocking degree is reduced, the working procedures are saved, and the time is saved; the circulation effect of the dip pipe in the using process can be guaranteed, and the phenomenon that the dip pipe is excessively blocked and is off-line is reduced.
The utility model has the advantages that:
the utility model discloses be applied to and carry out better protection to sealed gasbag under the high temperature environment, avoid high temperature steam to bake bad cortex sealed gasbag, carry out the molten steel circulation under the high vacuum environment and handle and played solid guarantee effect, and this method is simple, practical.
The utility model adopts the blocking and isolating thinking to cut off the passage of high-temperature hot gas reaching the top gun sealing air bag, and meanwhile, the protection device can be quickly isolated and can be quickly removed after the top gun is maintained; the protection of the sealing air bag under the maintenance of the RH furnace top gun is efficient and stable. The sealed air bag can be burnt out without a protection device, and the service life of the air bag after the air bag is protected is stored in a normal service cycle, which is generally 6-7 months.
The utility model adopts the top lance to maintain and replace, and simultaneously, is applied to the cleaning of the blockage of the blowing hole of the ascending pipe of the dip pipe in the high temperature environment, thereby avoiding the occurrence of inserting the dip pipe due to the blockage and prolonging the service life of the dip pipe; the service life of the abnormally blocked immersion pipe is 50-70 furnaces, the service life is 100-120 furnaces, and the stability of the circulation efficiency and the stability of the molten steel quality in the service life of the immersion pipe are ensured; and meanwhile, the program and the time are saved.
The utility model discloses a carry out simple transformation on the existing equipment basis, the operation implementation nature is stronger, and the blowing hole plug clearance has realized remote operation, has avoided personnel and high temperature slag's direct contact, adopts oxygen and slag directly to take place oxidation chemical reaction clearance to block up the blowing hole, especially can effectively get rid of the slag of the inside deep jam of blowing hole.
Drawings
FIG. 1 is a schematic view of the upper structure of the RH vacuum furnace of the present invention;
FIG. 2 is a schematic structural view of the sealing air bag protection device of the RH vacuum furnace of the present invention;
FIG. 3 is a schematic view of the lower structure of the RH vacuum furnace of the present invention.
Reference numerals: 1-a protection device; 11-a heat insulation plate; 12-a chain; 13-a steel strip; 14-asbestos; 2-sealing the air bag; 3-top gun; 4-hot bending the pipe; 5-sealing the channel; 6-vacuum groove; 7-alloy feed opening; 8-a molten steel ascending pipe; 9-a molten steel down pipe; 61-a gas blowing pipe; 62-oxygen branch pipe; 63-pressure sensor.
Detailed Description
The invention is further described below with reference to the drawings and the specific embodiments, but the invention is not limited to the embodiments described.
As shown in fig. 1 and 2, an RH vacuum furnace with a protection device for a sealed passage of an air bag comprises a vacuum tank 6, a hot bent pipe 4 for exhausting air, and an alloy material charging port 7 for charging; the hot bent pipe 4 and the alloy charging opening 7 are both arranged on the side wall of the vacuum tank 6;
a molten steel ascending pipe 8 and a molten steel descending pipe 9 which are positioned at the bottom of the vacuum tank 6, and a blowing pipeline 61 which is connected with the side wall of the ascending pipe 8;
the top lance 3, the top lance sealing channel 5 and the top lance sealing air bag 2 play a role in sealing;
the protection device 1 prevents the sealing air bag 2 from being damaged when the top lance 3 is lifted out of the top lance sealing channel 5;
the protection device 1 comprises a heat insulation plate 11, a chain 12 for connection and a steel bar 13 for fixing; the heat insulation plate 11 is circular, one end of the chain 12 is connected to the center of the heat insulation plate 11, and the other end of the chain is connected to the center of the steel bar 13; the length of the steel bar 13 is larger than the diameter of the top lance sealing channel 5; the diameter of the heat insulation plate 11 is smaller than that of the top lance sealing channel 5; the length of the chain 12 is less than that of the top lance sealing channel 5 and is greater than that from the top end of the top lance sealing channel 5 to the lower end of the sealing air bag 2; the heat insulation plate is a steel plate, and the thickness of the heat insulation plate is 2-3 mm;
asbestos is used for filling a gap between the heat insulation plate 11 and the sealing channel 5; the thickness of the asbestos is 2-3 mm.
The sealing air bag protection device effectively blocks the occurrence of the sealing air bag being burnt by high-temperature hot air, solves the sealing stability of the sealing channel sealing air bag in a high-temperature environment, and reduces the problems that the sealing air bag is frequently replaced due to high-temperature burning.
An oxygen branch pipe 62 and a pressure sensor 63 are connected to the side wall of the blowing pipe 61. When the blowing hole of the molten steel ascending pipe 8 becomes smaller or is blocked, the oxygen is blown through by the oxygen branch pipe 62.
Because the aperture of the air blowing pipeline is constant, when the air blowing hole is blocked, the pressure value measured by the pressure sensor is correspondingly increased, so that the blocking degree of the air blowing hole is judged; meanwhile, as the reaction is just finished, the impregnation pipe is in a high-temperature state, and oxygen is introduced at the moment, so that the oxygen reacts with the steel slag blocked at the air blowing hole, the steel slag is melted and falls down from the air blowing hole under the pushing of the oxygen at a certain flow velocity.
A method for rapidly protecting a top lance sealing air bag in a high-temperature environment based on the protection device comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; the heat insulation plate is hung in the sealing channel by using a chain, the length of the chain is less than that of the top gun sealing channel and is greater than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
Example 1:
a method for rapidly protecting a top lance sealing air bag by using the protection device under a high-temperature environment comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; therefore, the heat insulation plate is hung in the sealing channel by using a chain, the diameter of the heat insulation plate is smaller than the diameter of the top gun sealing channel by 3cm, the length of the chain is smaller than the length of the top gun sealing channel and is simultaneously larger than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
Example 2:
a method for rapidly protecting a top lance sealing air bag by using the protection device under a high-temperature environment comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; therefore, the heat insulation plate is hung in the sealing channel by using a chain, the diameter of the heat insulation plate is smaller than the diameter of the top gun sealing channel by 4cm, the length of the chain is smaller than the length of the top gun sealing channel and is simultaneously larger than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
Example 3:
a method for rapidly protecting a top lance sealing air bag by using the protection device under a high-temperature environment comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; therefore, the heat insulation plate is hung in the sealing channel by using a chain, the diameter of the heat insulation plate is smaller than the diameter of the top gun sealing channel by 2cm, the length of the chain is smaller than the length of the top gun sealing channel and is simultaneously larger than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
In conclusion, the protective top gun sealing air bag of the utility model can ensure the integrity and reliability of the air bag when the top gun is separated from the sealing air bag, avoid the occurrence of air bag damage caused by high-temperature hot air of the vacuum groove and the hot bent pipe, and better solve the dynamic sealing problem of the RH top gun and the vacuum groove; meanwhile, better guarantee is provided for the stability of the technical indexes of the molten steel treatment process of the RH vacuum furnace.
Example 4
A method for removing steel slag in a blowing hole of a dip pipe of an RH furnace in a top lance maintenance and replacement clearance comprises the following steps:
1) when the top lance needs to be lifted out of the sealing channel, the top lance sealing air bag is loosened through field manual operation, the top lance is lifted out of the sealing channel, high-temperature hot air in the vacuum groove is discharged from the top lance sealing channel, a heat insulation plate of the protection device is placed in the sealing channel in time, and a steel bar is supported at the upper end of the sealing channel; therefore, the heat insulation plate is hung in the sealing channel by using a chain, the diameter of the heat insulation plate is smaller than the diameter of the top gun sealing channel by 3cm, the length of the chain is smaller than the length of the top gun sealing channel and is simultaneously larger than the length from the top end of the top gun sealing channel to the lower end of the sealing air bag, and the heat insulation plate is ensured to be positioned below the top gun sealing air bag and higher than the bottom end of the sealing channel;
2) asbestos is filled in a gap between the heat insulation plate of the protection device and the sealing channel so as to ensure that a semi-sealing body is formed by the heat insulation steel plate of the protection device and the sealing channel and the rising space of high-temperature hot gas is blocked;
3) when the top lance is maintained and replaced, the gas in the blowing pipeline is replaced by oxygen for blowing through, the oxygen pressure is 1.2Mpa, and the blowing through is stopped until no steel slag falls;
4) when the top gun needs to descend to the vacuum groove, the heat insulation plate is pulled out through the chain, the top gun descends into the vacuum groove, and the sealing air bag works normally according to the linkage of the top gun.
The method can blow through the air blowing opening of the dip pipe while maintaining and replacing the top lance, so that the dip pipe can be blown through in time, the blocking degree is reduced, the working procedures are saved, and the time is saved; the circulation effect of the dip pipe in the using process can be guaranteed, and the off-line caused by excessive blockage of the dip pipe is reduced; meanwhile, the protection device can avoid the occurrence of air bag damage caused by high-temperature hot air of the vacuum groove and the hot bent pipe.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art will understand that modifications and equivalent substitutions can be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all of them shall fall within the scope of the claims of the present invention.
Claims (8)
1. A RH furnace top gun sealing air bag protection device is characterized by comprising a heat insulation plate, a connecting device and a fixing device; the heat insulation plate is circular, one end of the connecting device is connected to the center of the heat insulation plate, and the other end of the connecting device is connected to the fixing device; the diameter of the heat insulation plate is smaller than that of the top lance sealing channel; the length of the connecting device is smaller than that of the top lance sealing channel and is simultaneously larger than that from the top end of the top lance sealing channel to the lower end of the sealing air bag.
2. The RH roof lance sealing bladder protection device of claim 1, wherein the fixing means is a steel bar.
3. The RH roof lance sealing bladder protection device of claim 2, wherein the length of the steel strip is greater than the diameter of the lance sealing channel.
4. The RH roof gun sealing airbag protection device of claim 1, wherein the connecting device is a chain.
5. The RH top lance sealing air bag protection device according to claim 1, wherein the diameter of the heat insulation plate is 2-4 cm smaller than that of the top lance sealing channel.
6. The RH top gun sealing air bag protection device according to claim 1, wherein the heat insulation plate is a steel plate, and the thickness of the heat insulation plate is 2-3 mm.
7. An RH vacuum furnace is characterized by comprising a vacuum tank, a hot bent pipe for exhausting and an alloy material charging port for charging; the hot bent pipe and the alloy charging opening are both arranged on the side wall of the vacuum tank;
a molten steel ascending pipe and a molten steel descending pipe which are positioned at the bottom of the vacuum tank, and a blowing pipeline connected with the side wall of the ascending pipe;
the top lance, the top lance sealing channel and the top lance air bag play a role in sealing;
a protection device for preventing the sealing air bag from being damaged when the top lance is lifted out of the sealing channel of the top lance,
the protection device comprises a heat insulation plate, a chain for connecting and a steel bar for fixing; the heat insulation plate is circular, one end of the chain is connected to the center of the heat insulation plate, and the other end of the chain is connected to the center of the steel bar; the length of the steel bar is greater than the diameter of the top lance sealing channel; the diameter of the heat insulation plate is smaller than that of the top lance sealing channel; the length of the chain is less than that of the top lance sealing channel and is greater than that from the top end of the top lance sealing channel to the lower end of the sealing air bag;
and asbestos used for filling the gap between the heat insulation plate and the sealing channel is also included.
8. The RH vacuum furnace of claim 7, wherein an oxygen branch pipe and a pressure sensor are connected to a side wall of the blowing pipe.
Applications Claiming Priority (2)
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| CN202120322247 | 2021-02-03 | ||
| CN2021203222470 | 2021-02-03 |
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| CN215251000U true CN215251000U (en) | 2021-12-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941270A (en) * | 2021-02-03 | 2021-06-11 | 山东钢铁股份有限公司 | RH furnace top gun sealing air bag protection device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112941270A (en) * | 2021-02-03 | 2021-06-11 | 山东钢铁股份有限公司 | RH furnace top gun sealing air bag protection device and method |
| CN112941270B (en) * | 2021-02-03 | 2023-12-12 | 山东钢铁股份有限公司 | RH furnace top gun sealing airbag protection device and method |
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