摘要:
A shaped refractory body having an elongated passage for the feeding of molten metal. At least one conduit is provided extending from the exterior of said body into communication with the passage for the introduction of a gas thereto. The conduit is reduced in diameter at least at its inner end adjacent the passage to the size of a capillary.
摘要:
A process and apparatus for starting a continuous casting plant, which involves the filling of the empty area over the dummy bar of an ingot mold to the desired filling level, is simplified while achieving improved operating safety. To this end, a controllable spout closure, which is completely open during the starting of the casting of the molten metal into a tundish, is brought into a predetermined throttle position by the actual filling level rising in the ingot mold to a first signal level and thereafter the further rise of the actual filling level is monitored and controlled, if necessary, in accordance with a second signal level of a predetermined characteristic time curve by logically changing the throttle position of the spout closure. It is thereby possible to control the actual filling level rising in the ingot mold so as to reach its desired filling level without undue risk.
摘要:
For preventing break-out in a continuous casting plant in which the quantity of molten material being supplied to a mold is controlled to a predetermined level, changes in the quantity of molten material being supplied to the mold is constantly monitored. The time behavior of quantity increases of molten material being supplied to the mold is determined and a break-out signal is produced when the quantity of molten material increases at more than a predetermined rate. The break-out signal may be produced only when the rate of change of molten material in the mold and the rate of change of the speed of a casting leaving the mold are less than predetermined values.
摘要:
The casting of several strands with a common puller unit is effected by a process which allows a high degree of operational reliability in its initial start-up phase. To accomplish this, slide gates or valves are throttled at a predetermined level provided in the lower area of a measuring section monitoring the levels in a group of molds and the strand-pulling drive is switched on and the slide gates of molds that have remained in the level below the level are closed no later than at a point when at least one of the actual levels in the molds is at another predetermined level which is below the optimum level. The rising of the levels in the molds may be controlled in accordance with preset rising curves.
摘要:
Casting ladle gate valves of the type which are designed to be installed and removed from the ladle as a unit, are rebuilt in a work area which includes a disassembly station, a first assembly line including a revolving table for renewing the movable slide parts and a second assembly line including a revolving table for renewing the slide housings, and reassembling the slide parts, slide housings and clamping lids into renewed gate valve units. By preference, the disassembly station, both revolving tables and a conveyor for carrying the units to the work area from the foundry or steel work, and back are served by a slewing crane.
摘要:
For a foundry ladle provided with a sliding gate valve to be removed from the ladle as a unit to permit replacement of worn-out refractory material, there is provided a process and apparatus for assembly of the sliding gate valve unit in upright position, while the parts of the sliding gate valve unit are subjected to heating.
摘要:
A device for forming a mortar joint between a closure member and the outlet spout for a vessel which is used for handling molten material; the closure element has a bore which is alignable with the spout of the vessel and a cylindrical sheath constructed from combustible material is disposed concentrically with the bore of the closure element with the mortar material disposed on the face of the closure element that is to be placed in contact with the surface area surrounding the spout of the vessel; cooperating guide means are provided on the vessel or on the closure member for properly aligning the cylindrical sheath with the spout of the vessel so that, when the closure member is placed in abutting relationship with the spout of the vessel, the mortar material will form a sealing joint packing between the face of the spout and the face of the closure member while the cylindrical sheath will prevent ingress of mortar material into the bore of the closure member.
摘要:
A device for slag-free discharge into a continuous casting machine has a conventional starting pipe on an inlet of a discharge orifice of a tundish. A separate starting member blocks discharge through the starting pipe and floats upon a melt reaching a desired level. The device has improved features to ensure automatically the timely outflow of slag-free melt to the starting pipe.
摘要:
For a slide closure 10 attached to a pouring vessel 2 which has a movable slide part 14 disposed between a bottom plate 12 and a discharge part 16, there is, in addition to a cylinder piston unit 24 acting on the slide part, which unit is dominant by way of a servocontrol block 26 by regulating arrangement 32, a vibrator 36 which is controlled by an oscillator 34. The vibrator 36 is switched into the connection between the cylinder-piston unit 24 and the movable slide part 14, and is in a position to oscillatingly drive the latter both in its closing position as well as in other positions and, indeed, in the same direction as the cylinder piston unit. A position generator 44 starts the oscillator 34 forcibly in the closed position.
摘要:
A metallurgical furnace with a discharge chute has a slide closure between the outlet of the furnace and the chute. The chute is preferably detachably secured to the slide closure, on movable parts thereof and can be pivotally supported thereon.