CA1040832A - Apparatus for controlling the level of the molten metal in a mold for continuous casing - Google Patents
Apparatus for controlling the level of the molten metal in a mold for continuous casingInfo
- Publication number
- CA1040832A CA1040832A CA216,853A CA216853A CA1040832A CA 1040832 A CA1040832 A CA 1040832A CA 216853 A CA216853 A CA 216853A CA 1040832 A CA1040832 A CA 1040832A
- Authority
- CA
- Canada
- Prior art keywords
- servo
- piston
- cylinder device
- valve
- molten metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/187—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using X-rays or nuclear radiation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Automation & Control Theory (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Toxicology (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Control Of Position Or Direction (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE:
The molten metal level in a continuou? casting mold is controlled by a feedback control system com-prising a molten metal level detector, a controller and a servomechanism actuated the? by for adjusting the opening of the molten metal pouring nozzle. The servomechanism includes an intermediate and final piston-cylinder means operatively connected together to normally act as a unit. To cancel the offset due to disturbances, the connection between the two piston-cylinder means is temporarily cut off to manually adjust the intermediate one alone to compen-sate for the offset and the connection is made again to resume automatic control.
The molten metal level in a continuou? casting mold is controlled by a feedback control system com-prising a molten metal level detector, a controller and a servomechanism actuated the? by for adjusting the opening of the molten metal pouring nozzle. The servomechanism includes an intermediate and final piston-cylinder means operatively connected together to normally act as a unit. To cancel the offset due to disturbances, the connection between the two piston-cylinder means is temporarily cut off to manually adjust the intermediate one alone to compen-sate for the offset and the connection is made again to resume automatic control.
Description
BACKGRO~l~ OF THE I~ENTION:
Field of the Invention:
This invention relates to an apparatus for controlling the level of the molten metal in a mold . for continuous casting.
Description of the Prior Art:
In continuous casting, especially, continuous casting of slabs, it is important to stabili e the level of the molten metal in the mold from the view-` point of operation of the continuous casting and quality maintenance of the slab To control the level of the molten metal in.the mold, there has so far been in practice an apparatus which controls the ro~ation of the drawing pinch rollers in the continuous casting machine. Such an apparatus, however, has some pro-blems in its handling and in the quality of the products .~.
obtained.
SUMMARY OF THE INVENTION:
It is an object of the invention to provide a . ~.
control apparatus including a servomechanism for control- ;
ling the level of the molten metal in a mold for con-tinuous casting which is easy to operate and excellent in durability.
It is a further object of the invention to provide a control apparatus of this kind in which the transfer between manual control and automatic control may be accomplished bumplessly at une touch and in which the .qervomechanism may be compensated for a change in the .
Field of the Invention:
This invention relates to an apparatus for controlling the level of the molten metal in a mold . for continuous casting.
Description of the Prior Art:
In continuous casting, especially, continuous casting of slabs, it is important to stabili e the level of the molten metal in the mold from the view-` point of operation of the continuous casting and quality maintenance of the slab To control the level of the molten metal in.the mold, there has so far been in practice an apparatus which controls the ro~ation of the drawing pinch rollers in the continuous casting machine. Such an apparatus, however, has some pro-blems in its handling and in the quality of the products .~.
obtained.
SUMMARY OF THE INVENTION:
It is an object of the invention to provide a . ~.
control apparatus including a servomechanism for control- ;
ling the level of the molten metal in a mold for con-tinuous casting which is easy to operate and excellent in durability.
It is a further object of the invention to provide a control apparatus of this kind in which the transfer between manual control and automatic control may be accomplished bumplessly at une touch and in which the .qervomechanism may be compensated for a change in the .
- 2 _ ,:
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casting speed or the diameter of the nozzle of the tundish, or for an occasional leakage or compression of the hydraulic liquid in the servo-mechanism.
The apparatus for controlling the level of the molten metal in a continuous casting mold in accordance with the in-vention comprises a mold, a tundish located above said mold and : having a sliding nozzle at the bottom thereof, a detector for detecting the level of the molten metal in the mold, a control-ler connected to said detector for producing an output signal proportional to the difference between a measured value of the molten metal level detected by said detector and a setpoint for a standard level of the molten metal, a piston-cylinder device for opening and closing the sliding nozzle of said tundish, and a servo-mechanism provided between said controller and said nozzle opening and closing piston-cylinder device, said servo-mechanism including a servo-amplifier connected to said controller ~ ~-a servo-valve connected to and controlled by said servo-amplifier and coupled to a suitable pressurized fluid source, an inter-mediate piston-cylinder device having one chamber connected to 20 said servo-valve and the other chamber connected to one chamber :
of said nozzle opening and closing piston-cylinder device, the . other chamber of said nozzle opening and closing piston-cylinder -device being connected to said servo-valve, and a detecting circuit for detecting a position of the intermediate piston- . .
cylinder device to generate and feed a position signal to said ;. servo-amplifier, said servo-valve being operated under the con-trol of said servo-amplifier to supply said pressurized fluid :
to one of said one chamber of said intermediate piston-cylinder device and said other chamber of said nozzle opening and closing piston-cylinder device so as to drive said sliding nozzle, characterized in that said servo-mechanism further includes a compensation mechanism which includes a normally closed change :-.. ,~ '' .
- ' ' . . . , , ' ': ' ' '' ' . ': , ,, . ~ . ~ . . . .
~04~3Z
valve connected between the opposite chambers of said nozzle opening and closing piston-cylinder device so that when said change valve is opened, the opposite chambers of said nozzle opening and closing piston-cylinder device are short-circuited to allow only the piston of said intermediate piston-cylinder device alon~ to be returned back to its neutral point.
BRIEF DESCRIPTIO~ OF THE DRAWING:
Figure 1 is a schematic diagram showing an embodiment of the invention and Figure 2 is a detailed diagram showing the servo-mechanism A in the above embodiment.
DESCRIPTION OF THE PREFERRED EMBODIME~T:
An embodiment of the present invention will be describ-ed with reference to the drawings.
In Figure 1, a molten metal level detector 11 of a radioactive radiation transmission-type using such as Co60 is located at a predetermined level in the mold 10. The molten metal level detector 11 is connected to a controller 12, which is in turn connected to a servo-mechanism A comprising a servo-amplifier 13, an electric-hydraulic converter 14 and an intermediate cylinder means 15.
The controller 12 produces an output signal proportional to the difference between the measured value of the molten metal level detected by the level detector 11 and the setpoint value for a standard level of the molten metal. The controller is designed to be changeable between automatic control and -'. ;, manual control.
The servc-amplifier 13 is provided to amplify the difference between the output from the controller 12 and the output from the cylinder position detect-ing circuit. The function of the electric-hydraulic converter 14 is to convert the electrical output signal fromithe servo-amplifier 13 into oil pressure or oil flow.
The intermediate cylinder means 15 is drived -by the oil pressure from the converter 14. The nozzle opening and closing cylinder means 16 is connected to a slidir.g nozzle 18 of a tundish 17 located above the mold 10 and also is connected operatively to the intermediate cylinder means 15 to be moved along therewith.
The above described servomechanism A comprising said servo-ampli~ier 13, converter 14~and intermediate cylindar means 15 includes a compensation mechanism as shown in Figure 2. The compensation mechanism comprises a hydraulic servo-valve Vl c-onnected to the servo-amplifier 13 and to the left-hand side of the intermediate cylinder means 15, a cylinder position detecting circuit 19 for detecting the position of the intermediate cylinder means 15, a change valve V3 connected to said servo-valve Vl, the left-hand side of the nozzle opening and closing cylinder means 16 and the right-hand side of the intermediate cylinder means 15, 3 further change valve V2 connected to said ~- -.:
..
104~32 servo-valve Vl for changing between a source of high pressure oil H,S. and a source of low pressure oil L.S. for compensation purposes, and a control box 20 connected to both said change valves V3, V2, limit-switches LSl, LS2 on the opposite sides of the inter- :
mediate cylinder means 15 and the controller 12, where-by to resto~`e the pRsitiOn of the intermediate cylinder device 15 alone back to the neutral point.
The cylinder position detecting means 19 is connected to the piston 23 of the intermediate cylinder means 15 and the servo-amplifier 13. The servo-valve Vl is connected via a conduit 21 to the right-hand side of the nozzle opening and closing `
cylinder means 16 and is also connected via the change valve V3 and conduit 21 to the left-hand side of the nozzle opening and closing cylinder means 16 and the riBht side of the intermediate cylinder means 15.
The limit switch LSl is provided on the left-hand end of the intermedlate cylinder means 15, while the limit switch LS2 is provided on thè right-hand end of the same.
The control box 20 is provided with a push button PBl for changing from manual control to automa-tic control and another push button PB2 for the start-ing of compensation.
In operation of the apparatus in accordance with the invcntion~ the level of the molten metal in the mold 1 J is detected by the level detector 11 and :, :. .
this signal is fed to the controlle~ 12 In the controller 12 said signal, namely the di~ference between the measured value of the molten metal level, and the setpoint for a standard molten metal level is input to the servo-amplifier 13, the output from which is converted into oil pressure in the electric-hydraulic converter l4. The oil pressure drives the intermediate cylinder means 15 and hence the nozzle opening and closing cylinder means 16 operatively connected thereto to be moved therewith, whereby the openine of the sliding nozzle I8 will be adjusted to control the supply of molten metal from the tundish 17 into the mold 10 so that the level of the molten metal in the mold 10 is maintained at a standard :
level.
More particularly, the intermediate cylinder means 15 is drived by the high pressu~ed oil fed ; ~
through the hydraulic servo-valve Vl in accordance ~ -with the output of the servo-amplifier 13 and this drives the nozzle opening and closing cylinder means 16 along with the intermediate cylinder means 15.
The compensation mechanism is operative in the cases mentioned below:
(1) If there has arisen a change in the casting speed in the continuous casting or in the :~
diameter of the nozzle of the tundish, the level of the molten metal in the mold will :
become stable at a point deviated from the .
. : -- 7 - :
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. .
,, . ,~. ~ . . .
standard level. The compensation mechanism is operated in thls case.
(2) The compensation mechanism is operated in the case of the transfer from manual control to automatic control.
` ` , ' ' , ~
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casting speed or the diameter of the nozzle of the tundish, or for an occasional leakage or compression of the hydraulic liquid in the servo-mechanism.
The apparatus for controlling the level of the molten metal in a continuous casting mold in accordance with the in-vention comprises a mold, a tundish located above said mold and : having a sliding nozzle at the bottom thereof, a detector for detecting the level of the molten metal in the mold, a control-ler connected to said detector for producing an output signal proportional to the difference between a measured value of the molten metal level detected by said detector and a setpoint for a standard level of the molten metal, a piston-cylinder device for opening and closing the sliding nozzle of said tundish, and a servo-mechanism provided between said controller and said nozzle opening and closing piston-cylinder device, said servo-mechanism including a servo-amplifier connected to said controller ~ ~-a servo-valve connected to and controlled by said servo-amplifier and coupled to a suitable pressurized fluid source, an inter-mediate piston-cylinder device having one chamber connected to 20 said servo-valve and the other chamber connected to one chamber :
of said nozzle opening and closing piston-cylinder device, the . other chamber of said nozzle opening and closing piston-cylinder -device being connected to said servo-valve, and a detecting circuit for detecting a position of the intermediate piston- . .
cylinder device to generate and feed a position signal to said ;. servo-amplifier, said servo-valve being operated under the con-trol of said servo-amplifier to supply said pressurized fluid :
to one of said one chamber of said intermediate piston-cylinder device and said other chamber of said nozzle opening and closing piston-cylinder device so as to drive said sliding nozzle, characterized in that said servo-mechanism further includes a compensation mechanism which includes a normally closed change :-.. ,~ '' .
- ' ' . . . , , ' ': ' ' '' ' . ': , ,, . ~ . ~ . . . .
~04~3Z
valve connected between the opposite chambers of said nozzle opening and closing piston-cylinder device so that when said change valve is opened, the opposite chambers of said nozzle opening and closing piston-cylinder device are short-circuited to allow only the piston of said intermediate piston-cylinder device alon~ to be returned back to its neutral point.
BRIEF DESCRIPTIO~ OF THE DRAWING:
Figure 1 is a schematic diagram showing an embodiment of the invention and Figure 2 is a detailed diagram showing the servo-mechanism A in the above embodiment.
DESCRIPTION OF THE PREFERRED EMBODIME~T:
An embodiment of the present invention will be describ-ed with reference to the drawings.
In Figure 1, a molten metal level detector 11 of a radioactive radiation transmission-type using such as Co60 is located at a predetermined level in the mold 10. The molten metal level detector 11 is connected to a controller 12, which is in turn connected to a servo-mechanism A comprising a servo-amplifier 13, an electric-hydraulic converter 14 and an intermediate cylinder means 15.
The controller 12 produces an output signal proportional to the difference between the measured value of the molten metal level detected by the level detector 11 and the setpoint value for a standard level of the molten metal. The controller is designed to be changeable between automatic control and -'. ;, manual control.
The servc-amplifier 13 is provided to amplify the difference between the output from the controller 12 and the output from the cylinder position detect-ing circuit. The function of the electric-hydraulic converter 14 is to convert the electrical output signal fromithe servo-amplifier 13 into oil pressure or oil flow.
The intermediate cylinder means 15 is drived -by the oil pressure from the converter 14. The nozzle opening and closing cylinder means 16 is connected to a slidir.g nozzle 18 of a tundish 17 located above the mold 10 and also is connected operatively to the intermediate cylinder means 15 to be moved along therewith.
The above described servomechanism A comprising said servo-ampli~ier 13, converter 14~and intermediate cylindar means 15 includes a compensation mechanism as shown in Figure 2. The compensation mechanism comprises a hydraulic servo-valve Vl c-onnected to the servo-amplifier 13 and to the left-hand side of the intermediate cylinder means 15, a cylinder position detecting circuit 19 for detecting the position of the intermediate cylinder means 15, a change valve V3 connected to said servo-valve Vl, the left-hand side of the nozzle opening and closing cylinder means 16 and the right-hand side of the intermediate cylinder means 15, 3 further change valve V2 connected to said ~- -.:
..
104~32 servo-valve Vl for changing between a source of high pressure oil H,S. and a source of low pressure oil L.S. for compensation purposes, and a control box 20 connected to both said change valves V3, V2, limit-switches LSl, LS2 on the opposite sides of the inter- :
mediate cylinder means 15 and the controller 12, where-by to resto~`e the pRsitiOn of the intermediate cylinder device 15 alone back to the neutral point.
The cylinder position detecting means 19 is connected to the piston 23 of the intermediate cylinder means 15 and the servo-amplifier 13. The servo-valve Vl is connected via a conduit 21 to the right-hand side of the nozzle opening and closing `
cylinder means 16 and is also connected via the change valve V3 and conduit 21 to the left-hand side of the nozzle opening and closing cylinder means 16 and the riBht side of the intermediate cylinder means 15.
The limit switch LSl is provided on the left-hand end of the intermedlate cylinder means 15, while the limit switch LS2 is provided on thè right-hand end of the same.
The control box 20 is provided with a push button PBl for changing from manual control to automa-tic control and another push button PB2 for the start-ing of compensation.
In operation of the apparatus in accordance with the invcntion~ the level of the molten metal in the mold 1 J is detected by the level detector 11 and :, :. .
this signal is fed to the controlle~ 12 In the controller 12 said signal, namely the di~ference between the measured value of the molten metal level, and the setpoint for a standard molten metal level is input to the servo-amplifier 13, the output from which is converted into oil pressure in the electric-hydraulic converter l4. The oil pressure drives the intermediate cylinder means 15 and hence the nozzle opening and closing cylinder means 16 operatively connected thereto to be moved therewith, whereby the openine of the sliding nozzle I8 will be adjusted to control the supply of molten metal from the tundish 17 into the mold 10 so that the level of the molten metal in the mold 10 is maintained at a standard :
level.
More particularly, the intermediate cylinder means 15 is drived by the high pressu~ed oil fed ; ~
through the hydraulic servo-valve Vl in accordance ~ -with the output of the servo-amplifier 13 and this drives the nozzle opening and closing cylinder means 16 along with the intermediate cylinder means 15.
The compensation mechanism is operative in the cases mentioned below:
(1) If there has arisen a change in the casting speed in the continuous casting or in the :~
diameter of the nozzle of the tundish, the level of the molten metal in the mold will :
become stable at a point deviated from the .
. : -- 7 - :
' . ,''' " '',: ..' , ' '.', ';''.'".'.,' . '', ,.';: `'','. ~ "`
. .
,, . ,~. ~ . . .
standard level. The compensation mechanism is operated in thls case.
(2) The compensation mechanism is operated in the case of the transfer from manual control to automatic control.
(3) The compensation mechanism is operated when the piston 23 of the intermediate cylinder means 15 has reached either end of its stroke, a~ because of an occasional leakage of oil from the connection between the intermediate cylinder means 15 and the nozzle opening and closing cylinder means 16, or compression of oil.
In the case of the occurrence of a change in the casting speed or the diameter of the nozzle of the tundish the push button PB2 for starting compen-sation is operated to cause the control box 20~to issue a compensation signal which will actuate the change valve V2 to feed the servo-valve Vl with low pressure oil instead of high pressure oil, while on the other ~
hand the change valve V3 will be actuated to open a -~ ;
low-pressure oil circuit going from the intermediate cylinder means 15 through conduit 22, change valves V3 to conduit 21 so that only the intermediate cylinder 15 may be drived. At this time the nozzle cylinder means 16 cannot be moved by the low oil pressure and remains still due to the load of the sliding nozzle.
The controller 12 is then changed from automatic ' ..
, , 104-3~;~Z
control to manual control and, by manually operating the controllers 12, the piston 23 o~ the intermediate cylinder means 15 is brought back to its neutral posi-tion through t-he intermediary of the servo-amplifier 13 and the cylinder position detector 19. Thus the intermediate cylinder means 15 alone is set to the position corresponding to the normal output of the controller,~namely, the output that will appear when there is no deviation ~rom the standard of the molten metal level.
The push button PBl is then operated to change ~rom manual control to automatic control whereby the compensation signal is cut-off and normal control action is restored. Thus the change valves V2 and V3 are reset and the control 12 is turned to the automa-tic control so that the nozzle is drived to restore the standard level of the molten metal. ;-Also, when the piston 23 of the intermediate cylinder means 15 has reached the right-hand or left- ~ -hand ends o~ its stroke as because of casual leakage or compression of oil between the intermediate cylinder means 15 and the nozzle opening and closing cylinder means 16, either limit switch LSl or LS
will be tripped to cause the control box 20 to send a compensation signal whereby, in the same manner as ~ -mentioned above, the intermediate cylinder means 15 will be brought back to the neutral position.
..
, ,, . . :' ' . ' ', . :: '.: ., . -.
, . . , , . . . . . , ,,i, . .. . . .
In the case of the occurrence of a change in the casting speed or the diameter of the nozzle of the tundish the push button PB2 for starting compen-sation is operated to cause the control box 20~to issue a compensation signal which will actuate the change valve V2 to feed the servo-valve Vl with low pressure oil instead of high pressure oil, while on the other ~
hand the change valve V3 will be actuated to open a -~ ;
low-pressure oil circuit going from the intermediate cylinder means 15 through conduit 22, change valves V3 to conduit 21 so that only the intermediate cylinder 15 may be drived. At this time the nozzle cylinder means 16 cannot be moved by the low oil pressure and remains still due to the load of the sliding nozzle.
The controller 12 is then changed from automatic ' ..
, , 104-3~;~Z
control to manual control and, by manually operating the controllers 12, the piston 23 o~ the intermediate cylinder means 15 is brought back to its neutral posi-tion through t-he intermediary of the servo-amplifier 13 and the cylinder position detector 19. Thus the intermediate cylinder means 15 alone is set to the position corresponding to the normal output of the controller,~namely, the output that will appear when there is no deviation ~rom the standard of the molten metal level.
The push button PBl is then operated to change ~rom manual control to automatic control whereby the compensation signal is cut-off and normal control action is restored. Thus the change valves V2 and V3 are reset and the control 12 is turned to the automa-tic control so that the nozzle is drived to restore the standard level of the molten metal. ;-Also, when the piston 23 of the intermediate cylinder means 15 has reached the right-hand or left- ~ -hand ends o~ its stroke as because of casual leakage or compression of oil between the intermediate cylinder means 15 and the nozzle opening and closing cylinder means 16, either limit switch LSl or LS
will be tripped to cause the control box 20 to send a compensation signal whereby, in the same manner as ~ -mentioned above, the intermediate cylinder means 15 will be brought back to the neutral position.
..
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Claims (5)
1. An apparatus for controlling the level of molten metal in a mold for continuous casting, which comprises a mold, a tundish located above said mold and having a sliding nozzle provided at the bottom thereof, a detector for detecting the level of the molten metal in the mold, a controller connected to said detector and adapted to produce an output signal pro-portional to the difference between a measured value of the molten metal level detected by said detector and a setpoint for a standard level of the molten metal, a piston-cylinder device for opening and closing said sliding nozzle of said tundish, and a servo-mechanism provided between said controller and said nozzle opening and closing piston-cylinder device and including a servo-amplifier connected to said controller, a servo-valve connected to and controlled by said servo-amplifier and coupled to a suitable pressurized fluid source, an intermediate piston-cylinder device having one chamber connected to said servo-valve and the other chamber connected to one chamber of said nozzle opening and closing piston-cylinder device, the other chamber of said nozzle opening and closing piston-cylinder device being connected to said servo-valve, and a detecting circuit for detecting a position of the piston of said intermediate piston-cylinder device to generate and feed a position signal to said servo-amplifier, said servo-valve being operated under the control of said servo-amplifier to supply said pressurized fluid to one of said one chamber of said intermediate piston-cylinder device and said other chamber of said nozzle opening and closing piston-cylinder device so as to drive said sliding nozzle, characterized in that said servo-mechanism further includes a compensation mechanism which includes a normally closed change valve connected between the opposite chambers of said nozzle opening and closing piston-cylinder device so that when said change valve is opened, the opposite chambers of said nozzle opening and closing piston-cylinder device are short-circuited to allow only the piston of said intermediate piston-cylinder device along to be returned back to its neutral point.
2. An apparatus according to claim 1, wherein said com-pensation mechanism comprises a control box having a push button and adapted to open said chamge valve when said push button is operated.
3. An apparatus according to claim 1, further comprising another change valve connected to high and low pressure fluid sources and connected to said servo-valve to supply to said servo-valve said high pressure fluid under normal operation and said low pressure fluid when said first change valve is opened.
4. An apparatus according to claim 3, wherein said com-pensation mechanism comprises a control box having a push button and adapted to open said first change valve when said push button is operated and to cause said second change valve to supply said low pressure fluid to said servo-valve when said first change valve is opened.
5. An apparatus according to claim 4, wherein said com-pensation mechanism has a detector for detecting leakage of fluid from said intermediate piston-cylinder, said detector being adapted to cause said control box to operate when the leakage is found, so as to cause said first change valve to open, thereby separating the movement of said nozzle opening and closing piston-cylinder device from that of said intermediate piston-cylinder device.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP253974A JPS5342018B2 (en) | 1973-12-26 | 1973-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1040832A true CA1040832A (en) | 1978-10-24 |
Family
ID=11532171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA216,853A Expired CA1040832A (en) | 1973-12-26 | 1974-12-23 | Apparatus for controlling the level of the molten metal in a mold for continuous casing |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5342018B2 (en) |
| AT (1) | AT339520B (en) |
| CA (1) | CA1040832A (en) |
| DE (1) | DE2461086C3 (en) |
| ES (1) | ES433309A1 (en) |
| FR (1) | FR2255978B1 (en) |
| GB (1) | GB1468559A (en) |
| IT (1) | IT1026148B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5381854A (en) * | 1993-01-29 | 1995-01-17 | Her Majesty In Right Of Canada As Represented By The Minister Of Energy, Mines And Resoruces | Pneumatic flow control of liquid metals |
| US5515906A (en) * | 1993-01-29 | 1996-05-14 | Her Majesty In Right Of Canada As Represented By The Minister Of Energy, Mines And Resources | Pneumatic flow control of liquid metals |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4520266A (en) * | 1981-09-18 | 1985-05-28 | British Steel Corporation | Radiation level detectors |
| JPS60137324A (en) * | 1983-12-27 | 1985-07-20 | 中松 義郎 | Pillow |
| CN110102730B (en) * | 2019-04-18 | 2024-03-22 | 宣化钢铁集团有限责任公司 | Casting method of crystallizer |
| CN112404383A (en) * | 2020-10-09 | 2021-02-26 | 盐城市联鑫钢铁有限公司 | Quick control system of continuous casting tundish nozzle |
-
1973
- 1973-12-26 JP JP253974A patent/JPS5342018B2/ja not_active Expired
-
1974
- 1974-12-23 IT IT5474074A patent/IT1026148B/en active
- 1974-12-23 CA CA216,853A patent/CA1040832A/en not_active Expired
- 1974-12-23 FR FR7442568A patent/FR2255978B1/fr not_active Expired
- 1974-12-23 AT AT1029474A patent/AT339520B/en not_active IP Right Cessation
- 1974-12-23 DE DE19742461086 patent/DE2461086C3/en not_active Expired
- 1974-12-24 ES ES74433309A patent/ES433309A1/en not_active Expired
- 1974-12-24 GB GB5570274A patent/GB1468559A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5381854A (en) * | 1993-01-29 | 1995-01-17 | Her Majesty In Right Of Canada As Represented By The Minister Of Energy, Mines And Resoruces | Pneumatic flow control of liquid metals |
| US5515906A (en) * | 1993-01-29 | 1996-05-14 | Her Majesty In Right Of Canada As Represented By The Minister Of Energy, Mines And Resources | Pneumatic flow control of liquid metals |
Also Published As
| Publication number | Publication date |
|---|---|
| AT339520B (en) | 1977-10-25 |
| FR2255978B1 (en) | 1980-04-30 |
| ATA1029474A (en) | 1977-02-15 |
| DE2461086B2 (en) | 1978-08-03 |
| IT1026148B (en) | 1978-09-20 |
| FR2255978A1 (en) | 1975-07-25 |
| ES433309A1 (en) | 1976-12-16 |
| JPS5342018B2 (en) | 1978-11-08 |
| GB1468559A (en) | 1977-03-30 |
| JPS5095133A (en) | 1975-07-29 |
| AU7657074A (en) | 1976-06-24 |
| DE2461086C3 (en) | 1979-04-05 |
| DE2461086A1 (en) | 1975-07-03 |
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