GB2041584A - A device for controlling and adjusting the casting flow of general metals - Google Patents
A device for controlling and adjusting the casting flow of general metals Download PDFInfo
- Publication number
- GB2041584A GB2041584A GB8003938A GB8003938A GB2041584A GB 2041584 A GB2041584 A GB 2041584A GB 8003938 A GB8003938 A GB 8003938A GB 8003938 A GB8003938 A GB 8003938A GB 2041584 A GB2041584 A GB 2041584A
- Authority
- GB
- United Kingdom
- Prior art keywords
- control
- adjusting
- adjustment device
- controlling
- level
- 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.)
- Withdrawn
Links
- 239000002184 metal Substances 0.000 title claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 21
- 238000005266 casting Methods 0.000 title claims abstract description 14
- 150000002739 metals Chemical class 0.000 title claims abstract description 8
- 230000002285 radioactive effect Effects 0.000 claims abstract description 6
- 238000004458 analytical method Methods 0.000 claims abstract description 4
- 230000011664 signaling Effects 0.000 claims abstract description 3
- 230000005855 radiation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
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
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0602—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a casting wheel and belt, e.g. Properzi-process
-
- 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)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- Toxicology (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
- Measurement Of Radiation (AREA)
Abstract
A device for controlling and adjusting the casting flow of general metals comprises a radioactive source 8 associated with a detector 9 arranged on the opposite side of a casting wheel for level control. The detector 9 is connected to an electronic signal amplifier 10, provided with calibrating devices 11. In series with the amplifier, there is first preset a filter card 13 for analysis and attenuation of mains noises or disturbances. There is also a regulator 14, a recorder 15 and a level indicator 16. The regulator has an acoustic signalling device 17 connected thereto, as well as a control unit 18 which controls an electro-pneumatic converter 20 supplied by a compressed air circuit 21. The converter controls the position of an adjusting plug within a nozzle 4. <IMAGE>
Description
SPECIFICATION
A device for controlling and adjusting the casting flow of general metals
This invention relates to a device for controlling and adjusting the casting flow of general metals.
At present, adjustment of the flow of molten metals in continuous casting plants is effected by electric devices which through automatic sensors or manual controls operate on the casting nozzle either opening or closing the relevant plug.
However, these devices have some serious disadvantages, often causing dimensional irregularities in the wire rods being reduced and leading to extended periods of shutdown in the plants for maintenance or servicing.
Some of these disadvantages are represented by poor stability of the devices and inadequate accuracy of operation thereof because of being liable to frequent failures owing to the high temperature of the environment in which they are to operate
It is another disadvantage that the electric regulators applied to the nozzles for the molten metal flow have a limited or reduced force, so that it often occurs that following a full closure of the flow adjusting plugs, such regulators are incapable of re-opening the plugs owing to possible metal deposits left inside the nozzle.
It is a further disadvantage that during manual operation at least two operators should constantly control by sight the level of the molten metal flow, undertaking a job which is extremely delicate and requires constant attention that, even with skilled operators, may cause changes in the quality of the obtained product, particularly at those periods in which shifts are changed.
Preferably, the present invention can provide a device for controlling and adjusting the casting flow for general metals, to obviate the abovementioned disadvantages, to alleviate the operators' job, to reduce the number of operators to only one per shift, which is completely automated both as to the control of the level of the molten metal flow and as to the control of the valve adjusting plug, and which is capable of regularly and continuously operating also in the presence of a heat source.
Preferably, the invention can provide a controlling and adjusting device for assuring a product of superior quality, the changes in size of which are within a highly restricted tolerance range.
Preferably, the invention can provide a controlling and adjusting device for enabling a regular continuous operation without requiring a constant careful operator's presence and a high maintenance or servicing.
According to the present invention, a device for controlling and adjusting the casting flow of general metals comprises a radioactive source associated with a detector, arranged on the opposite sides of a casting wheel for level control, wherein the detector is connected to an electronic signal amplifier, provided with calibrating devices, in series of which there is first preset a filter card for analysis and attentuation of mains noises or disturbances, then a regulator, a recorder and a level indicator, the regulator having an acoustic alarm signalling device connected thereto, as well as a control unit controlling an electro-pneumaticconverterwhich is supplied by a compressed aircircuitwhich acts upon the pneumatic operator for positioning of the adjusting plug.
The invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 'is a schematic view of a continuous casting wheel showing the position of a radioactive source and detectorforthe control of the level of molten metal according to the invention;
Figure 2 is a schematic block diagram of the pneumatic circuit for controlling the position of the adjusting plug;
Figure 3 is a circuit diagram showing the various electronic components comprising the control and drive circuit; and
Figure 4 is a more detailed circuit diagram of the various electronic components comprising the control and drive circuit.
Figure 1 shows a casting wheel 1 having a peripheral groove 2 supplied with molten metal 3 from a nozzle 4.
The nozzle 4 is mounted on a ladle 5 for collecting the molten metal 3 from the furnace, and its opening is adjusted by a plug 6.
A containing band 7 is disposed in front of the peripheral groove 2 and contributes in conveying the molten metal to the lower cooling zone (not shown).
A radioactive source 8 is attached to one side of the wheel 1 and is aligned with a detector 8 located on the other side of the wheel 1.
The source 8 and detector 9 are aligned together at the height of the casting of the molten metal 3 in the groove 2 in order to sense the level thereof.
The source 8 is an X-ray emitter and the detector 9 is an ion chamber.
During operation, the detector 9 feeds a signal which is construed and amplified by an amplifier 10, the latter being provided with calibrating potentiometers 11 to adjust the system in accordance with the casting wheel, which is used time by time for the processing.
The amplifier 10 transmits the signal which is fed through the wires or leads 12, to a filter card 13, which analyses the signal, attenuates possible mains disturbances or noises and supplies the signal to a regulator 14.
The regulator 14 has a chart recorder 15 and a level indicator 16. The recorder 15 records the signal pattern, or the pattern of the molten metal flow level during its operation, and the level indicator 16 is connected to an acoustic alarm device 17 which is operated when either the level of the metal 3 reaches its maximum value, or when the level of the metal 3 reaches its desired minimum value.
By way of example, it is assumed to adjust the level to a value corresponding to 50%, the minimum level may be calibrated at 40% and maximum level at 60%.
Similarly for the acoustic signal, the regulator 14 transmits all the signals of level variation to the control unit 18, which compares the incoming signal with the calibrated signal. The unit 18 then operates by feedback signals the regulator 14 for restoring the position of the new level which is corrected by the signals, as suitably amplified by amplifiers 19, supplied to the electro-pneumatic converter 20.
Figure 2 shows the converter 20, which is supplied by a compressed air circuit 21 provided with a shutting-off valve 22, a filter 23, a drier 24 and reduction units 25, and is connected to the control device of the pneumatic positioning operator 26 for the plug 6.
Each of the electric signals transmitted by the unit 18 to the converter 20 is converted to a pneumatic signal controlling the opening or closing of the plug 6. Thus, the flow of molten metal leaving the nozzle 4 can be adjusted, and its level adjusted within the groove 2 according to the desired values.
Suitable digital devices 27 and 28 are inserted in the circuit for displaying to the operator the position of the level and the correction signal transmitted by the unit 18 to the converter 20.
Figure 3 shows a supply rectifier 29 for the acoustic alarm device 17, in this case a D.C. operating device, but such a device 17 could be an A.C.
device.
The operating unit 18 is also preset for manual operation of the level adjustment. Thus, it is provided with a potentiometer 30 (Figure 4), by means of which an operator can manuallytransmitthe correction signals to the regulator 14 and electropneumatic converter 20.
Under these conditions, the automatic circuit is cut off and the level control and adjustment are performed by the operator, this operation being particularly employed during plant or system start-up.
Claims (6)
1. A device for controlling and adjusting the casting flow of general metals comprising a radioactive source associated with a detector arranged on the opposite sides of a casting wheel for level control, wherein the detector is connected to an electronic signal amplifier, provided with calibrating devices, in series of which there is first preset a filter card for analysis and attenuation of mains noises or disturbances, then a regulator, a recorder and a level indicator or gauge, the reguiator having an acoustic alarm signalling device connected thereto, as well as a control unit controlling an electro-pneumatic con verter which is supplied by a compressed air circuit which acts upon the pneumatic operator for positioning of the adjusting plug.
2. A control and adjustment device according to
Claim 1, wherein the radioactive source is an X-ray emitter.
3. A control and adjustment device according to
Claim 1 or 2, wherein the radiation sensor is an ion chamber.
4. A control and adjustment device according to any of Claims 1,2 or 3, wherein the control unit is preset for automatic or manual operation.
5. A control and adjustment device according to any of the preceding claims provided with digital control means.
6. A control and adjustment device substantially as herein described with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT19940/79A IT1112165B (en) | 1979-02-06 | 1979-02-06 | CONTROL AND ADJUSTMENT DEVICE OF THE CASTING FLOW FOR METALS IN GENERAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2041584A true GB2041584A (en) | 1980-09-10 |
Family
ID=11162506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8003938A Withdrawn GB2041584A (en) | 1979-02-06 | 1980-02-06 | A device for controlling and adjusting the casting flow of general metals |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE3003917A1 (en) |
| FR (1) | FR2448400A1 (en) |
| GB (1) | GB2041584A (en) |
| IT (1) | IT1112165B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421120A (en) * | 2020-04-14 | 2020-07-17 | 石家庄钢铁有限责任公司 | Calibration device and method for checking liquid level of molten steel in crystallizer of bloom continuous casting machine |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2134428B (en) * | 1983-02-03 | 1987-06-17 | Metal Box Plc | Continuous extrusion of metals |
| NO154337C (en) * | 1983-08-26 | 1986-09-03 | Norsk Hydro As | PROCEDURE AND DEVICE FOR AUTOMATIC LEVEL REGULATION OF MELTED METAL. |
| US4600047A (en) * | 1984-03-29 | 1986-07-15 | Sumitomo Metal Industries, Ltd. | Process for controlling the molten metal level in continuous thin slab casting |
| EP0194327A1 (en) * | 1985-03-09 | 1986-09-17 | Fried. Krupp Gesellschaft mit beschränkter Haftung | Apparatus for regulating the position of the liquid metal level within a double belt continuous casting mould |
| US4667715A (en) * | 1985-12-06 | 1987-05-26 | Inland Steel Company | Method for controlling uniformity of alloy content in continuously cast steel |
| US5213151A (en) * | 1992-08-20 | 1993-05-25 | Ribbon Technology Corporation | Melt overflow control for constant linear density fiber mat and strip |
-
1979
- 1979-02-06 IT IT19940/79A patent/IT1112165B/en active
-
1980
- 1980-01-31 FR FR8002100A patent/FR2448400A1/en not_active Withdrawn
- 1980-02-04 DE DE19803003917 patent/DE3003917A1/en not_active Withdrawn
- 1980-02-06 GB GB8003938A patent/GB2041584A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111421120A (en) * | 2020-04-14 | 2020-07-17 | 石家庄钢铁有限责任公司 | Calibration device and method for checking liquid level of molten steel in crystallizer of bloom continuous casting machine |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3003917A1 (en) | 1980-08-14 |
| IT1112165B (en) | 1986-01-13 |
| IT7919940A0 (en) | 1979-02-06 |
| FR2448400A1 (en) | 1980-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |