EP1888274A2 - Sliding closure for metallurgical vessels - Google Patents
Sliding closure for metallurgical vesselsInfo
- Publication number
- EP1888274A2 EP1888274A2 EP06724814A EP06724814A EP1888274A2 EP 1888274 A2 EP1888274 A2 EP 1888274A2 EP 06724814 A EP06724814 A EP 06724814A EP 06724814 A EP06724814 A EP 06724814A EP 1888274 A2 EP1888274 A2 EP 1888274A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring
- parts
- closure
- sliding
- core
- 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- Withdrawn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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/40—Means for pressing the plates together
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/38—Means for operating the sliding gate
Definitions
- the invention relates to a sliding closure for metallurgical vessels according to the preamble of claim 1.
- a sliding closure of this type is disclosed in WO 03/080274. Closures of such sliding closures are known to be exposed to heavy wear and must therefore be replaced frequently. For economic reasons, however, it is endeavored to use these closure plates as long as possible. Nevertheless, in order to ensure a high degree of operational reliability and to detect impending malfunctions at an early stage, it is known from WO 03/080274 that Sliding closure equipped with at least one measuring device with which the position of the sliding surfaces against each other sliding closure plates can be measured and evaluated with respect to their change transversely to the sliding surfaces.
- the problem with the measurement of the closure plate position lies in the large temperature range in which the distance or the distance change must be measured.
- the temperature difference between the start temperature (eg 24 ° C) and the end temperature (eg 345 0 C) is considerable (here 321 0 C).
- the distance in the cold and hot state may differ by a few millimeters.
- the present invention has for its object to provide a sliding closure of the type mentioned, which has a high reliability, and in the unacceptable with little effort deviations in the closure plate position, taking into account temperature-related distance changes can be determined with sufficient accuracy.
- the slide fastener according to the invention is equipped with a measuring device which comprises two measuring coils mounted side by side on a bobbin mounted in one of the two housing parts and a core which is longitudinally adjustable in the axial direction of the bobbin and forms a differential inductor.
- a measuring device which comprises two measuring coils mounted side by side on a bobbin mounted in one of the two housing parts and a core which is longitudinally adjustable in the axial direction of the bobbin and forms a differential inductor.
- the core is displaced from a position opposite the measuring coils, thereby generating a voltage which is transmitted to an evaluation unit.
- the sliding gate according to the invention thus has a high level of operational reliability. Breakdowns and in particular breakthroughs, in which often the entire sliding closure mechanism and possibly also parts of the continuous casting plant can be destroyed, can be largely avoided. It can also be detected incorrect mounting on the sliding closure and also resulting breakthroughs can be prevented.
- FIG. 2 shows schematically the basic parts of the measuring device according to FIG. 1;
- FIG. and Fig. 3 is a circuit diagram of the measuring device for measuring and evaluating the shutter plate position.
- Fig. L shows a part of a slide fastener having in a known manner at least two mutually bracing refractory closure plates as closure parts, which are each arranged in a housing part and sliding surfaces against each other. It may be, for example, a sliding closure, which corresponds to that according to WO 03/080274, Fig. 2, and a stationary, attached to a vessel, upper housing part with a closure plate and a movable opposite, provided with the other closure plate Having the lower housing part, wherein the movable housing part and with it the other closure plate by a drive member in a closing or open position is displaceable.
- the closure plates themselves are not apparent from Fig. 1, and of the housing parts, only one housing part 1 is shown, wherein it is the stationary upper housing part in the illustrated embodiment.
- a guide unit 2 which has a guide pin 4 accommodated in a housing 3, at the lower end 4a of which at least one guide element, eg a guide roller, preferably two parallel guide rollers, which are not apparent from Fig. 1, is attached.
- a spring element 5 is arranged, on the one hand on a lower shoulder surface 3a of the housing 3 and on the other hand is supported on the guide pin 4 and presses the guide pin 4 upwards and with him the guide roller from below to a guide track of the movable housing part.
- a support ring 17 is further held, which serves as a stop of the bobbin 11 and the Fckenunsbolzens 4.
- FIG. 1 one of these guide units 2 is assigned a measuring device 10 for measuring the closure plate position with respect to its change transversely to the sliding surfaces.
- the basic parts of this measuring device 10 are also shown in FIG. 2, Fig. 3 shows a corresponding circuit diagram.
- the measuring device 10 comprises two measuring coils 12, 13 (FIG. 2) mounted on a bobbin 11 and a magnetic core 15 which is longitudinally displaceable in the axial direction of the bobbin via a non-magnetic drawbar 16 and which is located in a central opening 11a of the bobbin 11 Forming a differential throttle.
- the voltage changes caused by the movements of the magnetic core 15 can be measured from a central position shown in FIG. 2 (middle between the two measuring coils 12, 13).
- the differential choke can be operated with a commercially available carrier frequency amplifier 19 with integrated phase rectifier 19 (FIG. 3).
- the core 15 is associated with the guide unit 2 or its spring-loaded guide pin 4, with the pull rod 16 frontally mounted in the guide pin 4 at its upper end.
- the bobbin 1 1 with the measuring coils 12, 13 (FIG. 2) is installed above the guide unit 2, such that the pull rod 16 projects with the core 15 into the central opening II a.
- the changes in the distance of the two sliding closure housing parts or the two closure plates can be measured transversely to their sliding surfaces. For example, if molten steel penetrates between the closure plates, then a thin sheet may form there, which forces the closure plates apart. As a result, the lower housing part is pressed against the force of the spring elements 5 and its guideways and the guide rollers carrying guide rollers 4 down. Also equipped with the pull rod 16 and the core 15 guide pin 4 is moved in the housing 2 against the force of the spring element 5 down and the core 15 from its central position, in which the measuring voltage is zero, adjusted, creating a voltage now, which is transmitted via the phase rectifier 19 of the evaluation unit 20. This voltage is compared with the voltage measured at room temperature of a reference coil 21 (FIG. 3), which is likewise transmitted to the evaluation unit 20.
- a reference coil 21 FIG. 3
- a temperature-measuring device is connected, which comprises close to the closure plates arranged, not visible from the drawing temperature sensor.
- the measured distance between the two sliding closure housing parts or between the two closure plates is temperature-dependent.
- a measuring device had to be found can be achieved with the reproducible measurement results.
- the temperature drift is due to the compensation of the two measuring coils 12, 13 (in terms of their resistance change) substantially smaller than in other, also proven measuring systems (eg plunger anchor system). Thanks to the good reproducibility, it is possible to perform a formula-based temperature compensation. As a result, distance changes in a measuring range of 8 mm can be determined with an accuracy of less than 0.1 mm.
- the sliding closure according to the invention equipped with the measuring device 10 acting as a differential throttle, has a high level of operational reliability. Breakdowns and in particular breakthroughs, in which often the entire sliding closure mechanism and possibly also parts of the continuous casting can be destroyed, can be largely avoided. It can also be detected incorrect mounting on the sliding closure and also resulting breakthroughs can be prevented.
- the measuring device 10 is assigned. However, it could certainly be provided in several places such measuring devices.
- the measuring device 10 for measuring the distance or the distance changes between the two sliding closure housing parts could also be attached to a different location of the sliding closure than at One of the guide units 2. It could, for example - are arranged laterally to the housing parts - similar to the sliding closure according to WO 03/080274, Fig. 2, wherein here the displaceability of a housing part would have to be taken into account.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH45352005 | 2005-05-25 | ||
PCT/EP2006/004534 WO2006125543A2 (en) | 2005-05-25 | 2006-05-15 | Sliding closure for metallurgical vessels |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1888274A2 true EP1888274A2 (en) | 2008-02-20 |
Family
ID=37102953
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06724814A Withdrawn EP1888274A2 (en) | 2005-05-25 | 2006-05-15 | Sliding closure for metallurgical vessels |
Country Status (3)
Country | Link |
---|---|
US (1) | US20090134161A1 (en) |
EP (1) | EP1888274A2 (en) |
WO (1) | WO2006125543A2 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2744853B2 (en) * | 1991-03-29 | 1998-04-28 | 品川白煉瓦株式会社 | Plate brick cartridge for slide valve device and slide valve device using the cartridge |
DE19716607A1 (en) * | 1997-04-21 | 1998-10-22 | Kloeckner Moeller Gmbh | Sensor device for inductive displacement measurement of switching contacts of electromagnetic switching devices and electromagnetic switching device with a sensor device for inductive displacement measurement |
DE19757689C2 (en) * | 1997-12-23 | 2001-02-15 | Siedle Horst Gmbh & Co Kg | Inductive transmitter for paths |
US7171326B2 (en) * | 2002-03-25 | 2007-01-30 | Stopinc Aktiengesellschaft | Method for operating a sliding gate, and sliding gate |
AU2002333765A1 (en) * | 2002-08-30 | 2004-03-19 | Fev Motorentechnik Gmbh | Sensor assembly for detecting the movement of a controlling element, which has a short overall length and which is displaced back and forth by an actuator |
US7248994B1 (en) * | 2006-01-27 | 2007-07-24 | Alliant Techsystems Inc. | Digital method and apparatus for sensing position with a linear variable differential transformer |
-
2006
- 2006-05-15 EP EP06724814A patent/EP1888274A2/en not_active Withdrawn
- 2006-05-15 US US11/915,385 patent/US20090134161A1/en not_active Abandoned
- 2006-05-15 WO PCT/EP2006/004534 patent/WO2006125543A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006125543A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006125543A3 (en) | 2007-01-18 |
US20090134161A1 (en) | 2009-05-28 |
WO2006125543A2 (en) | 2006-11-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20071127 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20080402 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BUEHLMANN, ROLAND Inventor name: GERBER, PIERRE |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20080813 |