CN104988284A - Vacuum tank rubber seal ring protection method and molten steel vacuum refining method thereof - Google Patents
Vacuum tank rubber seal ring protection method and molten steel vacuum refining method thereof Download PDFInfo
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- CN104988284A CN104988284A CN201510291609.3A CN201510291609A CN104988284A CN 104988284 A CN104988284 A CN 104988284A CN 201510291609 A CN201510291609 A CN 201510291609A CN 104988284 A CN104988284 A CN 104988284A
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Abstract
The invention discloses a vacuum tank rubber seal ring protection method. The method is characterized in that a vacuum tank rubber seal ring protection mechanism is arranged on an operation platform of a molten steel VD vacuum refining furnace in advance, the vacuum tank rubber seal ring protection mechanism comprises a slag stop board horizontally arranged below a vacuum tank cover vehicle of the operation platform, the slag stop board is higher than a pouring port of a vacuum tank, and a telescopic device is arranged at the side, away from the corresponding vacuum tank, of the slag stop board; in the steel making technological process, when a vacuum tank cover moves, the telescopic device is started, and the slag stop board is driven to stretch forwards to shield the position above a rubber seal ring for protection. The invention further discloses a molten steel vacuum refining method adopting the vacuum tank rubber seal ring protection method. By the adoption of the vacuum tank rubber seal ring protection method and the molten steel vacuum refining method, the seal ring can be well protected, the molten steel refining efficiency and effect can be improved, and the refining furnace has the beneficial effects that the structure is compact, covering operation control is convenient, operation stability is good, work efficiency is high, and service life is long.
Description
Technical field
The present invention relates to a kind of steel-making VD refining techniques, particularly relate to the guard method of a kind of vacuum tank rubber seal and vacuum refining method of molten steel thereof.
Background technology
Steel-making VD refining techniques, be a kind of VD of employing stove in the mode vacuumized, molten steel is carried out to the technique of refining.VD stove has another name called VD
shaped steelbag refining furnace, can realize under vacuo Argon, oxygen blast,
decarburization, vacuum outgas, the operation such as alloying constituent fine setting under vacuum; Under can carrying out general Fruit storage and vacuum to molten steel, alloying constituent is finely tuned.Its working process, generally comprise and open vacuum container cover and hang in ladle, connect argon-blowing device Argon, thermometric samples, and covers vacuum container cover and vacuumizes and carry out processing (when being necessary oxygen blast), open vacuum container cover after being disposed, thermometric samples and determines hydrogen and determines oxygen again, carry out feeding silk (adding the adjusting component such as aluminium wire, silico-calcium silk) adjustment according to detected result, stop Argon, complete refining and hang out ladle.
China's patent No. 201220444104.8 once disclosed a kind of simple and practical VD refining furnace, but belonged to single station structure, and working efficiency is lower.
China patent No. ZL201120423331.8 once disclosed the two tank body VD vacuum oven of a kind of single cover, comprise power supply, service platform, tank body, cover, cover car, vacuum pump system, hydraulic efficiency system, cooling system, fly-ash separator, argon blowing system, said tank body is two, share a cover, two tank bodies are separately positioned on cover both sides, and service platform is provided with track, and track is provided with cover car, cover is arranged on cover car, can along track to-and-fro movement.In foregoing invention, devise two tank bodies and share a cover formation double, when a tank body carries out vacuum-treat, another tank body can carry out thermometric, feeds silk, determines oxygen, determine the operations such as hydrogen, the preparation work time is saved compared with single station VD stove, two station alternately operatings, can raise the efficiency.
But, still there is following defect: 1, VD stove integral structure layout not science in this existing Double-station type VD stove technology, be unfavorable for manipulation and take up an area space larger.2, cover bassinet structure is comparatively simple, is unfavorable for the closing lid of cover and the operation such as opens.3, pumped vacuum systems is the wet type pumped vacuum systems adopting vapor jet pump, but structure is too complicated, and be unfavorable for manipulation, Sewage treatment systems floor space is large.4, higher to steam needs, system energy consumption is high.5, whole process control procedure needs to optimize further, to enhance productivity, improves control stiffness, the extension device life-span.
Summary of the invention
For above-mentioned the deficiencies in the prior art; technical problem to be solved by this invention is: how to provide the guard method of a kind of vacuum tank rubber seal and vacuum refining method of molten steel thereof; the good protection to sealing-ring can be realized, liquid steel refining efficiency and effect can be improved.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
The guard method of a kind of vacuum tank rubber seal, it is characterized in that, the service platform of molten steel VD vacuum refining furnace first arranges the vacuum tank sealing-ring protection mechanism of following structure, described vacuum tank sealing-ring protection mechanism, comprise one to be horizontally disposed with below vacuum container cover car on the operational platform and to fill with the skimming plate of open height above vacuum tank, in vacuum tank, the projection vertically of the mobile route of Splashproof cover drops in the width range of skimming plate, skimming plate is provided with retractor device away from the side of corresponding vacuum tank, the expansion link telescopic direction of retractor device is consistent with Splashproof cover mobile route direction, expansion link front end to be connected on skimming plate and skimming plate front end can be driven to stretch out be covered in corresponding vacuum tank fills with above mouth sides adjacent,
In process for making process, when vacuum tank vacuum-treat terminates, in vacuum tank, vacuum breaker is to recovering normal pressure, promote vacuum container cover to upper limit, then retractor device is started, drive skimming plate to stretch out forward and cover in above rubber seal, dropping in sealing groove to stop the high-temperature steel slag on Splashproof cover burns out rubber seal; After vacuum container cover car moves to standby station, skimming plate resets; Simultaneously vacuum container cover car will travel to production station, also first will start skimming plate and shelter from rubber seal, until after vacuum container cover garage sails to and produce station, skimming plate resets, and vacuum container cover starts after having fallen sealing to carry out vacuum-treat.
Such employing present method can realize the protection to vacuum tank rubber seal; sealing-ring is protected without the need to adopting water coolant; cooling water generates steam can be avoided to damage dry vacuum system, simultaneously good to sealing-ring protection effect, sealing ring tightness and work-ing life can be ensured.
The invention also discloses a kind of vacuum refining method of molten steel, it is characterized in that, first obtain the molten steel VD vacuum refining furnace of following structure, this refining furnace comprises two vacuum tanks that spacing parallel arranging is arranged, argon-blowing device and tank internal gas pressure detection probe is provided with in vacuum tank, also comprise and be horizontally placed on the service platform that open height position filled with by vacuum tank, service platform is also provided with vacuum container cover car, roller below vacuum container cover car coordinates to be arranged on and is positioned on vacuum container cover car guide rail that two vacuum tank external side parallel arrange, vacuum container cover is connected with below vacuum container cover car, vacuum container cover comprises and is positioned at top and for installing the enclosing cover coordinated and the Splashproof cover be hung at for coordinating with ladle below enclosing cover with vacuum tank, vacuum tank is filled with mouth and is provided with a circle sealing groove, rubber seal is provided with in sealing groove, also comprise pumped vacuum systems, described pumped vacuum systems comprises two and vacuumizes small transfer line, two one end vacuumizing small transfer line are communicated with the vacuum tank sealing of correspondence respectively, the other end is connected to by threeway and vacuumizes main pipeline and be connected to vacuum pump system, two vacuumize on small transfer line and are respectively provided with a vacuum main valve, be set up in molten steel by erecting frame below described service platform to melt down above line, and service platform and molten steel melt down the space left between line and pass through for ladle, vacuum container cover is also provided with the searchlight for throwing light on to molten steel,
During steel-making, molten steel melts down line guide rail by molten steel and is transported to service platform one side-lower in ladle, is then hung in by ladle in the vacuum tank treating work state, connect argon-blowing device to ladle argon-blown and thermometric sampling; Close this vacuum tank correspondence and vacuumize vacuum main valve on small transfer line, need to close another simultaneously and vacuumize vacuum main valve on small transfer line, then start vacuum pump system and carry out forvacuum; After taking out in advance, vacuum container cover car is moved to production station above this vacuum tank from the standby station between two vacuum tanks, vacuum container cover is covered this vacuum tank, open the correspondence vacuum main valve vacuumized on small transfer line and vacuumize and carry out refining treatment; Vacuum container cover is opened after being disposed, vacuum container cover car returns standby station, thermometric, sampling again, determines hydrogen, determines oxygen and determines the hydrogen-oxygen content of molten steel, requires to feed silk adjusting component according to molten steel composition, finally stop Argon and hang out ladle, completing the vacuum refining of liquid steel process of single station; In this treating processes after vacuum container cover car returns standby station, namely start the vacuum refining of liquid steel process of another station according to above-mentioned steps flow process simultaneously, realize the process of double alternate cycles;
In above-mentioned steelmaking process, have employed method as above and vacuum tank rubber seal is protected.
Like this, VD stove is crossed on molten steel to melt down above line, himself can not affect the normal use that molten steel melts down line, can melt down by molten steel the conveying that line carries out ladle simultaneously, so just dramatically saves on floor space, make STEELMAKING PRODUCTION line integral layout compact and reasonable more, save device layout cost.
Simultaneously, present method not only shares a set of vacuum container cover and pumped vacuum systems, save component cost, and a station carry out vacuumizing complete after treatment step time, another station first can carry out forvacuum process, shorten and vacuumize overall required time, the time that significantly reduces economizes consumption, improves working efficiency.
As optimization, it is flat car body that vacuum container cover car comprises overall appearance, car body four end has downward sway brace and is connected on vacuum container cover car guide rail at sway brace lower end installation roller, interval, car body lower surface side is provided with two hydro-cylinders, hydraulic cylinder extension arm arranges inwards and is connected with two chains in telescopic boom front end, two chain front ends walk around separately forward time interval be arranged on two fixed pulleys on car body backward under be connected on vacuum container cover, the Hydraulic Station of described two hydro-cylinders is arranged on car body upper surface.
Like this, when vacuum container cover closed by needs, only need control vacuum container cover car moves to above the corresponding vacuum tank producing station, control its telescopic boom by hydro-cylinder to stretch out, vacuum container cover leans on gravity descending gradually and drops into vacuum tank and fills with in the sealing groove of mouth setting, completes hermetically closing by rubber seal; When vacuum container cover opened by needs, only need Reverse Turning Control hydraulic cylinder extension arm to retract, namely reliable chain realizes the lifting to vacuum container cover, completes unlatching.
Further, the tie point of four chains on vacuum container cover is annularly uniformly distributed around vacuum container cover axial line, is beneficial to keep balance, improves manipulation stability.
As optimization, described hydro-cylinder rear end is hinged on car body by horizontally disposed hinge, and hydraulic cylinder extension arm front end connects two chains by an adapter, and adapter lower end can be engaged on a horizontal sliding table horizontally slidingly.Like this, the stability improving hydro-cylinder control vacuum container cover is more beneficial to.
Further, bottom, adapter one end is directly connected with a chain, and this end top is connected with another root chain by a horizontally disposed union lever, can improve structural stability better like this, improves control stiffness.
As optimization, described car body is also fixedly installed orienting sleeve straight down, is equipped with guidepost in orienting sleeve, guidepost lower end is fixed on vacuum container cover straight down.Like this, orienting sleeve and guidepost form guiding mechanism, control the accuracy that vacuum container cover moves up and down direction, ensure closing process accurately and reliably.
As optimization, described service platform entirety is T-shaped, and its wider two ends, side arrange two vacuum tanks, are provided with operation room above narrower side.
Like this, setting operation room, conveniently can realize the electrical control to refining process.Make service platform have simple and compact for structure, joint space-efficient feature simultaneously.
As optimization, mouth filled with by the vacuum tank of described skimming plate and adjacent side is the arcuate structure that radian correspondence is consistent.Like this, only need move a little distance can block sealing-ring just, can not cause obstruction to the movement of Splashproof cover simultaneously.
As optimization, both sides, described skimming plate lower end are provided with roller, and roller rolls on the guide rail that coordinates and support and arrange along the mobile route direction of Splashproof cover on the operational platform.Like this, can conveniently to supporting and the control movement of skimming plate.
As optimization, described skimming plate is that riffled iron material obtains.Like this, skimming plate surfaceness is high, facilitates workman's standing operation, not easily falls down.
As optimization, described retractor device has two covers and is arranged on the end positions of skimming plate away from the side of corresponding vacuum tank separately.Like this, retractor device is exerted a force and more balances, working process is more steadily reliable.
As optimization, described retractor device adopts cylinder.There is structure so simple, with low cost, be beneficial to the effects such as control.
Further, above cylinder, be provided with cylinder protective cover, to protect cylinder better.
As optimization, in pumped vacuum systems, vacuumize on main pipeline and be also connected with water cooler and filtration unit.
Like this, water cooler can cool the gas extracted out, and filtration unit can filter out the dust in withdrawing gas, avoids withdrawing gas temperature too high or be mingled with dust and cause damage to vacuum pump, ensure vacuum pump job stability, extend service life of vacuum pump.
Further, vacuumize on small transfer line, be positioned at vacuum main valve side and be also arranged in parallel internal diameter and be less than the by-pass line vacuumizing small transfer line internal diameter, described by-pass line is also provided with bypass pipe switching control pilot.
Like this, in pumped vacuum systems, be provided with by-pass line, when closing vacuum main valve and taking out in advance, close corresponding bypass pipe switching control pilot simultaneously, (generally stop during pre-internal gas pressure 67 handkerchief left and right, the vacuum main of being evacuated to road) after taking out in advance, first open bypass pipe switching control pilot, make vacuumizing small transfer line and first tentatively can being communicated with by the by-pass line of minor diameter and carrying out pressure release of vacuum main valve rear and front end, when to make before and after vacuum main valve pipeline upward pressure close to balance, open vacuum main valve again, close bypass pipe switching control pilot, vacuumize.Like this because by-pass line internal diameter is less, during pressure release, excessive impact and fluctuation can not be caused on rear and front end.Pressure release to position, vacuum main valve rear and front end pressure difference can not excessive time open vacuum main valve again (in general pressure release to vacuum tank, pressure be 30 kilowatts of handkerchiefs, venting duration is 90-120 second, pressure leak process can be ensured and follow-uply open the stable of vacuum main valve process), two ends can not form pressure difference excessive instantaneously, can not cause large pressure surge.And then avoid the influence of fluctuations of vacuum main valve two ends air pressure impact, prevent slag steel expulsion events, ensure that result of use and the work-ing life of filtration unit and vacuum pump system.
Further, vacuumize in main pipeline and be also provided with pipeline air pressure detection probe, tank internal gas pressure detection probe all with controller in described pipeline air pressure detection probe and vacuum tank is connected, described vacuum main valve and bypass pipe switching control pilot are solenoid electric valve, and described controller is electrically connected with the electric control part sub-module of vacuum main valve and bypass pipe switching control pilot respectively.Controller is arranged at operation room and controls with handled easily.
Like this, above-mentioned control process can realize electrified control automatically.Ensure to control accurately in time, improve vacuumizing effect.
Further, described by-pass line is also provided with a bypass pipe circulation control valve.Like this, the ventilation flow rate of bypass pipe circulation control valve regulating and controlling by-pass line can be leaned on, the pressure difference of moment can not be caused when ensureing pressure release excessive, avoid pressure release to cause fluctuation.
In sum; the present invention can realize the good protection to sealing-ring; liquid steel refining efficiency and effect can be improved; have refining furnace compact construction, scientific arrangement, occupation of land space is little simultaneously; facilitate cover to operate to control; pumped vacuum systems is rational in infrastructure, manipulation good stability, the high and advantages such as long service life of working efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation (not showing vacuum tank sealing-ring protection mechanism and vacuum pump system structure in figure) that direction overlooked by molten steel VD vacuum refining furnace in embodiment.
Fig. 2 is Fig. 1 sectional view.
Fig. 3 is the structural representation of the vacuum tank sealing-ring protection mechanism of molten steel VD vacuum refining furnace in embodiment.
Fig. 4 is the vertical view of Fig. 3.
Embodiment
Below in conjunction with a kind of molten steel VD vacuum refining furnace and concrete implementation process thereof, the present invention is described in further detail.
Embodiment, as Figure 1-4, during the invention process, need first to obtain a kind of molten steel VD vacuum refining furnace, its structure comprises two vacuum tanks 1 that spacing parallel arranging is arranged, argon-blowing device and tank internal gas pressure detection probe is provided with in vacuum tank 1, also comprise and be horizontally placed on the service platform 2 that open height position filled with by vacuum tank, service platform 2 is also provided with vacuum container cover car, roller below vacuum container cover car coordinates to be arranged on and is positioned on vacuum container cover car guide rail 3 that two vacuum tank external side parallel arrange, vacuum container cover 4 is connected with below vacuum container cover car, vacuum container cover 4 comprises and is positioned at top and for installing the enclosing cover coordinated and the Splashproof cover 5 be hung at for coordinating with ladle below enclosing cover with vacuum tank, vacuum tank 1 is filled with mouth and is provided with a circle sealing groove, rubber seal is provided with in sealing groove, also comprise pumped vacuum systems, described pumped vacuum systems comprises two and vacuumizes small transfer line 6, two one end vacuumizing small transfer line 6 are communicated with the vacuum tank sealing of correspondence respectively, the other end is connected to by threeway and vacuumizes main pipeline 7 and be connected to vacuum pump system, two vacuumize on small transfer line 6 and are respectively provided with a vacuum main valve 8, wherein, be set up in molten steel by erecting frame below described service platform 2 and melt down above line guide rail 9, and service platform 2 and molten steel melt down the space left between line guide rail 9 and pass through for ladle 10.Wherein, vacuum container cover 4 is also provided with the searchlight for throwing light on to molten steel and the camera for making a video recording to molten steel.
In the present invention, VD stove is crossed on molten steel to melt down above line, himself can not affect the normal use that molten steel melts down line, can melt down by molten steel the conveying that line carries out ladle simultaneously, so just dramatically saves on floor space, make STEELMAKING PRODUCTION line integral layout compact and reasonable more, save device layout cost.
This Sample Method make steel time, molten steel melts down line guide rail by molten steel and is transported to service platform one side-lower in ladle, is then hung in by ladle in the vacuum tank treating work state, connect argon-blowing device to ladle argon-blown and thermometric sampling; Close this vacuum tank correspondence and vacuumize vacuum main valve on small transfer line, need to close another simultaneously and vacuumize vacuum main valve on small transfer line, then start vacuum pump system and carry out forvacuum; After taking out in advance, vacuum container cover car is moved to production station above this vacuum tank from the standby station between two vacuum tanks, vacuum container cover is covered this vacuum tank, open the correspondence vacuum main valve vacuumized on small transfer line and vacuumize and carry out refining treatment; Vacuum container cover is opened after being disposed, vacuum container cover car returns standby station, thermometric, sampling again, determines hydrogen, determines oxygen and determines the hydrogen-oxygen content of molten steel, requires to feed silk adjusting component according to molten steel composition, finally stop Argon and hang out ladle, completing the vacuum refining of liquid steel process of single station; In this treating processes after vacuum container cover car returns standby station, namely start the vacuum refining of liquid steel process of another station according to above-mentioned steps flow process simultaneously, realize the process of double alternate cycles.So not only share a set of vacuum container cover and pumped vacuum systems, save component cost, and a station carry out vacuumizing complete after treatment step time, another station first can carry out forvacuum process, shorten and vacuumize overall required time, the time that significantly reduces economizes consumption, improves working efficiency.
Wherein, it is flat car body 11 that vacuum container cover car comprises overall appearance, car body 11 4 end has downward sway brace 12 and is connected on vacuum container cover car guide rail 3 at sway brace lower end installation roller, interval, car body 11 lower surface side is provided with two hydro-cylinders 13, hydraulic cylinder extension arm arranges inwards and is connected with two chains 14 in telescopic boom front end, two chain 14 front ends walk around separately forward time interval be arranged on two fixed pulleys on car body backward under be connected on vacuum container cover 4, the Hydraulic Station 15 of described two hydro-cylinders 13 is arranged on car body 11 upper surface.
Like this, when vacuum container cover closed by needs, only need control vacuum container cover car moves to above the corresponding vacuum tank producing station, control its telescopic boom by hydro-cylinder to stretch out, vacuum container cover leans on gravity descending gradually and drops into vacuum tank and fills with in the sealing groove of mouth setting, completes hermetically closing by rubber seal; When vacuum container cover opened by needs, only need Reverse Turning Control hydraulic cylinder extension arm to retract, namely reliable chain realizes the lifting to vacuum container cover, completes unlatching.
Wherein, the tie point of four chains 14 on vacuum container cover is annularly uniformly distributed around vacuum container cover axial line, is beneficial to keep balance, improves manipulation stability.
Wherein, described hydro-cylinder 13 rear end is hinged on car body 11 by horizontally disposed hinge, and hydraulic cylinder extension arm front end connects two chains 14 by an adapter, and adapter lower end can be engaged on a horizontal sliding table horizontally slidingly.Like this, the stability improving hydro-cylinder control vacuum container cover is more beneficial to.
Wherein, bottom, adapter one end is directly connected with a chain, and this end top is connected with another root chain by a horizontally disposed union lever 16, can improve structural stability better like this, improves control stiffness.
Wherein, described car body 11 is also fixedly installed orienting sleeve 17 straight down, is equipped with guidepost 18 in orienting sleeve 17, guidepost 18 lower end is fixed on vacuum container cover straight down.Like this, orienting sleeve and guidepost form guiding mechanism, control the accuracy that vacuum container cover moves up and down direction, ensure closing process accurately and reliably.
Wherein, described service platform 2 is overall T-shaped, and its wider two ends, side arrange two vacuum tanks 1, are provided with operation room 19 above narrower side.
Like this, setting operation room, conveniently can realize the electrical control to refining process.Make service platform have simple and compact for structure, joint space-efficient feature simultaneously.
Wherein, on service platform 2, vacuum tank underlying surfaces is also provided with thermofin, and the ladle high temperature passed through to prevent below, on the impact of vacuum tank, ensures normal use and the work-ing life of vacuum tank.
Wherein, described service platform 2 is also provided with vacuum tank sealing-ring protection mechanism, comprise one to be horizontally disposed with below vacuum container cover car on the operational platform and to fill with the skimming plate 23 of open height above vacuum tank, in vacuum tank, the projection vertically of the mobile route of Splashproof cover drops in the width range of skimming plate, skimming plate is provided with retractor device 25 away from the side of corresponding vacuum tank, the expansion link telescopic direction of retractor device 25 is consistent with Splashproof cover mobile route direction, expansion link front end to be connected on skimming plate 23 and skimming plate 23 front end can be driven to stretch out be covered in corresponding vacuum tank and fills with above mouth sides adjacent.
Because this VD furnace structure adopts dry-type vacuum pumping system, in order to reduce water vapour hindering and damaging vacuum pump, vacuum tank is filled with in mouth sealing groove and is not arranged water coolant, therefore needs to adopt above-mentioned protection mechanism to protect the rubber seal in sealing groove.After above-mentioned protection mechanism is set, in actual production, when vacuum tank vacuum-treat terminates, in vacuum tank, vacuum breaker is to recovering normal pressure, promote vacuum container cover 4 to upper limit, then start retractor device, drive skimming plate to stretch out forward and cover in above rubber seal, dropping in sealing groove to stop the high-temperature steel slag on Splashproof cover burns out rubber seal.After vacuum container cover car moves to standby station, skimming plate resets.Or vacuum container cover car will travel to production station, also first will start skimming plate and shelter from rubber seal, produces after station until vacuum container cover garage sails to, skimming plate resets, and vacuum container cover falls and starts to carry out vacuum-treat.So just without the need to adopting water coolant to protect sealing-ring, cooling water generates steam can be avoided to damage dry vacuum system, simultaneously good to sealing-ring protection effect, sealing ring tightness and work-ing life can be ensured.
Wherein, mouth filled with by the vacuum tank of described skimming plate 23 and adjacent side is the arcuate structure that radian correspondence is consistent.Like this, only need move a little distance can block sealing-ring just, can not cause obstruction to the movement of Splashproof cover simultaneously.
Wherein, both sides, described skimming plate 23 lower end are provided with roller 26, and roller 26 rolls on the guide rail 27 that coordinates and support and arrange along the mobile route direction of Splashproof cover on the operational platform.Like this, can conveniently to supporting and the control movement of skimming plate.
Wherein, described skimming plate 23 for riffled iron material obtain.Like this, skimming plate surfaceness is high, facilitates workman's standing operation, not easily falls down.
Wherein, described retractor device 25 has two covers and is arranged on the end positions of skimming plate away from the side of corresponding vacuum tank 1 separately.Like this, retractor device is exerted a force and more balances, working process is more steadily reliable.
Wherein, described retractor device 25 adopts cylinder.There is structure so simple, with low cost, be beneficial to the effects such as control.
Wherein, above cylinder, be provided with cylinder protective cover 28, to protect cylinder better.
Wherein, in pumped vacuum systems, vacuumize on main pipeline 7 and be also connected with water cooler 29 and filtration unit (not shown).
Like this, water cooler can cool the gas extracted out, filtration unit can filter out the dust (generally adopting sack cleaner) in withdrawing gas, avoid withdrawing gas temperature too high or be mingled with dust damage is caused to vacuum pump, ensure vacuum pump job stability, extend service life of vacuum pump.
Wherein, vacuumize on small transfer line 6, be positioned at vacuum main valve side and be also arranged in parallel internal diameter and be less than the by-pass line 30 vacuumizing small transfer line internal diameter, described by-pass line 30 is also provided with bypass pipe switching control pilot 31.
Like this, in pumped vacuum systems, be provided with by-pass line, when closing vacuum main valve and taking out in advance, close corresponding bypass pipe switching control pilot simultaneously, (generally stop during pre-internal gas pressure 67 handkerchief left and right, the vacuum main of being evacuated to road) after taking out in advance, first open bypass pipe switching control pilot, make vacuumizing small transfer line and first tentatively can being communicated with by the by-pass line of minor diameter and carrying out pressure release of vacuum main valve rear and front end, when to make before and after vacuum main valve pipeline upward pressure close to balance, open vacuum main valve again, close bypass pipe switching control pilot, vacuumize.Like this because by-pass line internal diameter is less, during pressure release, excessive impact and fluctuation can not be caused on rear and front end.Pressure release to position, vacuum main valve rear and front end pressure difference can not excessive time open vacuum main valve again (in general pressure release to vacuum tank, pressure be 30 kilowatts of handkerchiefs, venting duration is 90-120 second, pressure leak process can be ensured and follow-uply open the stable of vacuum main valve process), two ends can not form pressure difference excessive instantaneously, can not cause large pressure surge.And then avoid the influence of fluctuations of vacuum main valve two ends air pressure impact, prevent slag steel expulsion events, ensure that result of use and the work-ing life of filtration unit and vacuum pump system.
Wherein, vacuumize in main pipeline 7 and be also provided with pipeline air pressure detection probe, tank internal gas pressure detection probe all with controller 32 in described pipeline air pressure detection probe and vacuum tank is connected, described vacuum main valve and bypass pipe switching control pilot are solenoid electric valve, and described controller is electrically connected with the electric control part sub-module of vacuum main valve and bypass pipe switching control pilot respectively.Controller is arranged at operation room 19 and controls with handled easily.
Like this, above-mentioned control process can realize electrified control automatically.Ensure to control accurately in time, improve vacuumizing effect.
Wherein, described by-pass line 30 is also provided with a bypass pipe circulation control valve (not shown).Like this, the ventilation flow rate of bypass pipe circulation control valve regulating and controlling by-pass line can be leaned on, the pressure difference of moment can not be caused when ensureing pressure release excessive, avoid pressure release to cause fluctuation.
Claims (2)
1. vacuum tank rubber seal guard method, it is characterized in that, the service platform of molten steel VD vacuum refining furnace first arranges the vacuum tank sealing-ring protection mechanism of following structure, described vacuum tank sealing-ring protection mechanism, comprise one to be horizontally disposed with below vacuum container cover car on the operational platform and to fill with the skimming plate of open height above vacuum tank, in vacuum tank, the projection vertically of the mobile route of Splashproof cover drops in the width range of skimming plate, skimming plate is provided with retractor device away from the side of corresponding vacuum tank, the expansion link telescopic direction of retractor device is consistent with Splashproof cover mobile route direction, expansion link front end to be connected on skimming plate and skimming plate front end can be driven to stretch out be covered in corresponding vacuum tank fills with above mouth sides adjacent,
In process for making process, when vacuum tank vacuum-treat terminates, in vacuum tank, vacuum breaker is to recovering normal pressure, promote vacuum container cover to upper limit, then retractor device is started, drive skimming plate to stretch out forward and cover in above rubber seal, dropping in sealing groove to stop the high-temperature steel slag on Splashproof cover burns out rubber seal; After vacuum container cover car moves to standby station, skimming plate resets; Simultaneously vacuum container cover car will travel to production station, also first will start skimming plate and shelter from rubber seal, until after vacuum container cover garage sails to and produce station, skimming plate resets, and vacuum container cover starts after having fallen sealing to carry out vacuum-treat.
2. a vacuum refining method of molten steel, it is characterized in that, first obtain the molten steel VD vacuum refining furnace of following structure, this refining furnace comprises two vacuum tanks that spacing parallel arranging is arranged, argon-blowing device and tank internal gas pressure detection probe is provided with in vacuum tank, also comprise and be horizontally placed on the service platform that open height position filled with by vacuum tank, service platform is also provided with vacuum container cover car, roller below vacuum container cover car coordinates to be arranged on and is positioned on vacuum container cover car guide rail that two vacuum tank external side parallel arrange, vacuum container cover is connected with below vacuum container cover car, vacuum container cover comprises and is positioned at top and for installing the enclosing cover coordinated and the Splashproof cover be hung at for coordinating with ladle below enclosing cover with vacuum tank, vacuum tank is filled with mouth and is provided with a circle sealing groove, rubber seal is provided with in sealing groove, also comprise pumped vacuum systems, described pumped vacuum systems comprises two and vacuumizes small transfer line, two one end vacuumizing small transfer line are communicated with the vacuum tank sealing of correspondence respectively, the other end is connected to by threeway and vacuumizes main pipeline and be connected to vacuum pump system, two vacuumize on small transfer line and are respectively provided with a vacuum main valve, be set up in molten steel by erecting frame below described service platform to melt down above line, and service platform and molten steel melt down the space left between line and pass through for ladle, vacuum container cover is also provided with the searchlight for throwing light on to molten steel,
During steel-making, molten steel melts down line guide rail by molten steel and is transported to service platform one side-lower in ladle, is then hung in by ladle in the vacuum tank treating work state, connect argon-blowing device to ladle argon-blown and thermometric sampling; Close this vacuum tank correspondence and vacuumize vacuum main valve on small transfer line, need to close another simultaneously and vacuumize vacuum main valve on small transfer line, then start vacuum pump system and carry out forvacuum; After taking out in advance, vacuum container cover car is moved to production station above this vacuum tank from the standby station between two vacuum tanks, vacuum container cover is covered this vacuum tank, open the correspondence vacuum main valve vacuumized on small transfer line and vacuumize and carry out refining treatment; Vacuum container cover is opened after being disposed, vacuum container cover car returns standby station, thermometric, sampling again, determines hydrogen, determines oxygen and determines the hydrogen-oxygen content of molten steel, requires to feed silk adjusting component according to molten steel composition, finally stop Argon and hang out ladle, completing the vacuum refining of liquid steel process of single station; In this treating processes after vacuum container cover car returns standby station, namely start the vacuum refining of liquid steel process of another station according to above-mentioned steps flow process simultaneously, realize the process of double alternate cycles;
In above-mentioned steelmaking process, have employed method according to claim 1 and vacuum tank rubber seal is protected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510291609.3A CN104988284B (en) | 2015-06-01 | 2015-06-01 | Vacuum tank rubber seal ring protection method and molten steel vacuum refining method thereof |
Applications Claiming Priority (1)
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| CN107447077A (en) * | 2017-08-23 | 2017-12-08 | 浙江杭真能源科技股份有限公司 | Fume dust remover and its dust removal method during vacuum refining furnace hello silk |
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| JPH08232014A (en) * | 1995-02-23 | 1996-09-10 | Nippon Steel Corp | Vacuum refining furnace and operation thereof |
| CN202301926U (en) * | 2011-10-26 | 2012-07-04 | 莱芜钢铁股份有限公司 | Long-life protection device of VD (Vacuum Distillation) sealing ring of vacuum treatment furnace |
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| JPH08232014A (en) * | 1995-02-23 | 1996-09-10 | Nippon Steel Corp | Vacuum refining furnace and operation thereof |
| CN202301926U (en) * | 2011-10-26 | 2012-07-04 | 莱芜钢铁股份有限公司 | Long-life protection device of VD (Vacuum Distillation) sealing ring of vacuum treatment furnace |
| CN202643745U (en) * | 2012-07-04 | 2013-01-02 | 莱芜钢铁集团有限公司 | Vacuum distillation (VD) furnace vacuum tank body seal ring protection device |
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| CN107447077A (en) * | 2017-08-23 | 2017-12-08 | 浙江杭真能源科技股份有限公司 | Fume dust remover and its dust removal method during vacuum refining furnace hello silk |
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