Metallurgical apparatus – Means sealing or opening aperture in vessel
Patent
1991-04-02
1992-07-28
Kastler, Scott
Metallurgical apparatus
Means sealing or opening aperture in vessel
266287, C21C 548
Patent
active
051335344
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an arrangement for the removal of worn nozzle bricks or linings in tap holes of metallurgical vessels, comprising an expander unit, which can be introduced into the nozzle brick or into the tap hole, and a drive means to pull away the nozzle brick or the lining by means of the expander unit.
For the dismounting of nozzle bricks which are mounted in the tap holes of metallurgical vessels, it has already become known, for example in AT Patent 386 422, to support an apparatus on the outer side of the metallurgical vessel, to which apparatus is connected an extracting means which extends in the axial direction of the nozzle brick and is longitudinally adjustable in this axial direction by means of a telescopic pressure-medium cylinder. The extracting means of this known arrangement has at least two clamping jaws which can be brought into engagement with, or to disengage from the nozzle brick by means of an expander unit, and this known arrangement is intended to remove nozzle bricks without damaging the permanent lining of the metallurgical vessel. In this regard, the known arrangement must first be brought into the correct position by hand and secured in position on the outer side of the hot metallurgical vessel, the handling being complicated in so far as the arrangement, together with the hot nozzle brick, must be removed manually when the nozzle brick has actually been loosened. It has been found, in many cases, that nozzle bricks cannot readily be pulled out of their position by simple application of pressure or application of tensile force in the axial direction, without damaging the permanent lining. An arrangement for the extraction of a gas-fluxing brick from a nozzle brick has become known from AT Patent 383 831, which took into consideration the fact that a simple axial pull is not, as such, suitable for the reliable loosening of the nozzle brick. In the case of this known arrangement, which must likewise be connected by hand to the gas-fluxing brick, a sliding member is provided which is pushed with considerable force against a buffer, whereby the resultant mass moment of inertia produces an action force which extends in the longitudinal direction of the guide bricks and which pulls the gas-fluxing brick out of the nozzle brick. The extraction forces are, therefore, brought to bear abruptly, it being necessary, in this case, too, to place the arrangement in position by hand against the gas-fluxing brick to be removed. The support is, again, provided on the outer side of the hot metallurgical vessel so as to keep the interruption of operations to a minimum.
It is only gas-fluxing bricks, and not the nozzle brick itself, which are pulled away using the arrangement which has become known from AT Patent 383 831. Nozzle bricks are used, primarily, in tap holes, for example of converters, and the wear of such nozzle bricks results from the contact with the liquid metal during pouring. The region of the tap hole is, therefore, usually provided with a two-layer nozzle brick lining, those nozzle brick members, which are in each case to be replaced, being connected via binding agents to the permanent lining, i.e. the second nozzle brick lining which remains in the metallurgical vessel for a longer period of time. Such nozzle bricks, which are connected to the permanent lining by binding agents, in particular scoured nozzle bricks, must, as a rule, be chiselled out by means of pneumatic air hammers or drilled out by means of drilling appliances. Hydraulic pulling appliances, such as are disclosed, for example, in AT Patent 386 422, can usually only be regarded as being successful when clamping jaws engage the nozzle brick from within and behind, in order to ensure adequate tensile force; it is, of course, not always possible, as such, to preclude the risk of damage to the permanent lining.
The object now of the invention is to provide an arrangement of the kind mentioned at the outset, which, without additional manipulation such as, for example, the erection of a working platform, per
REFERENCES:
patent: 4222505 (1980-09-01), Daussan et al.
patent: 4381102 (1983-04-01), King
Garger Erwin
Gortan Dieter
Mocivnik Josef
Pacnik Peter
Schantl Werner
Bohler Pneumatic International GmbH
Kastler Scott
Veitscher Magnesitwerke-Actien-Gesellschaft
LandOfFree
Device for removing worn nozzle bricks or nozzle linings from me does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for removing worn nozzle bricks or nozzle linings from me, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for removing worn nozzle bricks or nozzle linings from me will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1683495