Metallurgical apparatus – Means sealing or opening aperture in vessel
Patent
1994-09-19
1995-12-19
Kastler, Scott
Metallurgical apparatus
Means sealing or opening aperture in vessel
266 45, C21C 548
Patent
active
054762502
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a machine for piercing a taphole for a shaft furnace, designed for the implementation of the method called "lost rod method" in which, after having blocked the taphole with a taphole clay, a metal rod is driven into this clay, before it has fully hardened, and it is extracted, at the desired time, with a view to opening the taphole. The said machine comprises a mounting for supporting the rod during the said method, a drive means mounted on the mounting so as to develop a traction force or thrust force respectively parallel to the mounting, a coupling member for coupling the said drive means to the rod so as to transmit the said traction force to it during its extraction.
Prior Art
The machines used until now for the implementation of this lost rod method are, in principle, conventional drilling apparatuses, that is to say drilling apparatuses designed for working with a drill bit, which have however undergone appropriate adaptations and modifications for the implementation of the method.
The working member of these machines, which normally serves to drive a cutting drill bit rotationally, must include a coupling clamp for the rod and, especially, a powerful bidirectional pneumatic hammer for delivering the energy necessary for the insertion and extraction of the piercing rod according to the said "lost rod method".
From the document FR-A-2,520,857, a clamp is known which is designed to be mounted on the bidirectional hammer drilling apparatus of a conventional taphole piercing machine. For the operation of extracting a piercing rod embedded in the taphole clay, the normal coupling of the drilling apparatus, serving to communicate a rotational movement to a drill bit, is exchanged with this clamp. The latter then makes it possible to couple the drilling apparatus to the rear end of the piercing rod and to withdraw it by actuating a powerful hammer integral with the drilling apparatus.
In most cases, these piercing machines also preserve the possibility of being able to use the drilling apparatus with a conventional drill bit, either for reforming or moving the taphole, or for drilling the hole conventionally when the lost rod method cannot be used for one reason or another. However, in order to drill the taphole with a conventional drill bit, it is necessarily required to exchange the clamp with the normal coupling of the drilling apparatus, since the jaws of the clamp are not suitable for transmitting a rotational movement to a drill bit.
It will be noted that a powerful hammer, as is used on these machines, is not without disadvantages. Firstly, it exerts considerable stresses and vibrations on the equipment particularly on the rod-coupling clamp, which is, as a result, subjected to rapid wear. It is also extremely noisy, and often does not conform to the ever-stricter standards aiming to reduce the noise level in an industrial environment.
The disadvantages of the hammer could consequently make it desirable to eliminate the percussion during the insertion and extraction of the rod.
From the document EP-A-0,379,018, a piercing machine is known for the implementation of the "lost rod method" which does not use a hammer for the extraction of the rod for piercing the hardened taphole clay. For this purpose, the machine proposed uses a clamp which can move towards the front of the mounting by means of a powerful hydraulic jack whose stroke is, for size-requirement reasons, substantially smaller than the length of the piercing rod to be extracted. This jack causes the clamp to perform several strokes in the vicinity of the front end of the mounting in order to extract the rod by its complete length from the taphole. It follows that the extracted piercing rod--which is hot, deformed and clogged-up--must pass entirely through this extraction clamp. In addition, the extraction clamp is exposed to the projected splashes from the taphole as soon as it is opened. The document EP-A0,379,018 contains no indication how it would
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patent: 5069430 (1991-12-01), Woodings et al.
patent: 5192489 (1993-03-01), Metz et al.
patent: 5308047 (1994-05-01), Lonardi et al.
patent: 5333839 (1994-08-01), Lonardi et al.
patent: 5338013 (1994-08-01), Lonardi et al.
patent: 5351939 (1994-10-01), Kremer et al.
Andonov Radomir
Lonardi Emile
Mailliet Pierre
Malivoir Philippe
Metz Jean
Kastler Scott
Paul Wurth S.A.
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