Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By means introducing treating material
Patent
1988-02-15
1989-02-07
Rutledge, L. Dewayne
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By means introducing treating material
266268, 266270, C21C 548
Patent
active
048026557
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns improvements in apparatus for injecting substances into liquids.
More particularly, the injection apparatus is primarily meant for injecting gases, gases plus powders, or solids--usually accompanied by gases, into potentially dangerous liquids, e.g. molten metals such as iron and steel. The purposes of injecting such substances are numerous and diverse. Our U.S. Pat. No. 4,575,393, outlines some of the reasons for introducing substances into molten metals and in this connection reference is directed to that publication for further details.
Like U.S. Pat. No., the present invention pertains to apparatus for injecting substances through a wall of a melt containment vessel such as a ladle. The wall could be the bottom or more usually the side of the vessel. The apparatus is of the type comprising a refractory block for installing in the vessel wall, the block being pierced by an injection passage in which a delivery pipe is movable forcibly towards a liquid-facing end thereof, to permit injection to commence by breaking or dislodging a passage blocking element which is temporarily located at or in this end to prevent melt entering the passage before injection is commenced. By expelling, breaking or dislodging the blocking element, the pipe opens the passage for admitting into the melt a substance delivered via the delivery pipe.
If the blocking element is prematurely or accidentally unseated from the end of the passage, melt could rapidly enter the passage due to the static pressure of the melt. Under some circumstances, the melt might leak from the vessel via the passage, e.g. thrusting the delivery pipe from the passage as it does so. This could obviously be dangerous. Alternatively, the melt might enter the passage and freeze therein, effectively sealing the passage and preventing the subsequent injection of substances into the melt. Unseating of the blocking element due to careless installation and/or premature advancement of the pipe is thus to be avoided and this invention aims to prevent such inadvertent advancement in a simple but effective manner.
According to one aspect of the present invention, there is provided apparatus of the type hereinbefore defined, for injecting substances into a liquid through the wall of a liquid containment vessel, wherein the delivery pipe is part of a lance assembly and wherein positioning means including a detent arrangement acting between said assembly and a fixed part of the apparatus define a stop for locating the lance assembly at a predetermined ready position prior to injection.
In a preferred embodiment, the stop defined by the detent arrangement locates a discharge end of the delivery pipe spaced from the passage blocking element a predetermined distance and prevents inadvertent displacement of the pipe into contact with the blocking element. The detent arrangement can be overcome when a predetermined advancing force is deliberately exerted on the lance assembly, said force being made greater than any force that could be applied manually.
The detent arrangement preferably also defines a second stop preventing inadvertent withdrawal or ejection of the lance assembly from an advanced, injection position thereof.
The detent arrangement can comprise a spring-loaded element on the one hand which coacts with an abutment on the other hand; the former may be housed in the fixed part of the apparatus when the latter is mounted on the lance assembly, or vice versa. Preferably two detents act on the lance assembly.
According to another aspect of the present invention, the stop enabling the lance assembly to be held in a predetermined position prior to injection comprises a shear pin and an abutment. The abutment shears off the shear pin allowing the lance assembly to be advanced to its injection position when a predetermined advancing force is deliberately exerted on the assembly. The force necessary to shear the pin is made greater than any force that can be applied manually.
Conveniently, the shear pin is mounted on the movable lance assem
REFERENCES:
patent: 3495815 (1970-02-01), Holmes
patent: 4298192 (1981-11-01), Barbakadze et al.
patent: 4392636 (1983-07-01), Clumpner
patent: 4575393 (1986-03-01), Bates et al.
patent: 4742995 (1988-05-01), Bates
Ingersoll Buchanan
Injectall Limited
McDowell Robert L.
Rutledge L. Dewayne
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