Lance holder with multiple function gripping head

Details Lance holder with multiple function gripping head Lance holder with multiple function gripping head

1999-03-15

2001-01-09

Kastler, Scott (Department: 1742)

Metallurgical apparatus

Means for melting or vaporizing metal or treating liquefied...

By means introducing treating material

C266S225000

Reexamination Certificate

active

06171545

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention concerns a lance holder for oxygen lance tubes with a collet which is adaptable to the diameter of the oxygen lance tube, and of a pressure casing which is arranged on the holder and constructed so as to be slidable longitudinally over the collet with the aid of an adjusting facility, whereby the collet is allocated a deformable sealing casing clamping the lance tube.
Lances with a collet and a pressure casing which is slidable over it serve to hold the lance needing to be refined, and secondly, for example, to assure that the workers operating the lance holder are not in danger when concluding or interrupting the blowing process. Lance holders with a slag run back safety device can be gathered from EP-B1-0 372 098. Here, the pressure casing slides over the collet with the aid of a toggle joint to fix the lance tube. A seal is arranged behind the collet which is squeezed when the collet is slid in order to seal the lance tube tight. Such a lance holder or its collet is in part adapted to various tube diameters, whereby the force necessary for staying leads to the toggle joint often being violently pressed back or struck so that damage to the lance holders occurs. As a consequence, the fixation of the oxygen lance tube is no longer exact. DE-PS-195 47 885 also shows a lance holder allocated to a lance manipulator in connection with which, however, manual labor for staying the oxygen lance tube is largely unnecessary because the pressure casing has available a clamp dog which ensures that an appropriately strong spring then provides for a secure mounting of the lance tube if the clamp dog is released. If a tube end is to be removed and a new oxygen lance tube is to be introduced, compressed air is administered to the clamping piston so that this is pushed against the force of the compression spring. At the same time, the collet is released so that corresponding manipulations become possible. Such a lance holder offers considerable advantages. But the risk of danger to personnel in extreme situations cannot be avoided. Such a threat exists, for example, if the oxygen lance tube is blocked in front, and exists as a rule with slag. When oxygen is delivered, this can then leave the oxygen lance such that a dangerously high pressure builds up in the lance holder and elements associated with it. When the collet is released, a dangerous flying up of the oxygen lance tube or even a springing back of the lance holder occurs.
SUMMARY OF THE INVENTION
Therefore, underlying the invention is the objective of making a lance holder which is to be joined with the lance tube in a simple and safe handling manner, and which is also to be uncoupled from the lance tube again, even with a blocked lance tube and under the action of pressure.
The objective is accomplished in accordance with the invention in that the sealing casing with sealing is arranged in a pressure cylinder which is slidable with limitations longitudinally in the holder and at the same time acting upon the seal, positioned so as to be acted upon by the pressure medium (O
2
) in the interior, and in that a bypass with safety blocking pistons (which is constructed as unlatchable through the adjustment facility) is provided in front of the pressure piston in the direction of flow of the pressure medium (O
2
) in the interior of the holder, or connectable with the atmosphere.
It is possible with the aid of a lance holder constructed in this manner to release forced pressure from the interior of the lance holder when the oxygen lance tube is blocked, principally blocked by slag, so that afterward the lance tube can be removed and replaced by a new one without the risk of danger arising. The interior of the lance holder is connected with the atmosphere through a bypass for this purpose, whereby the safety blocking piston in the bypass is unlatched through the adjustment facility which slides or slides back the pressure casing over the collet. This means that the safety blocking piston is automatically opened when the pressure casing slides back so that the oxygen standing in the interior under pressure can flow off. The pressure piston acting upon the sealing casing is moreover subjected to stress by the oxygen and therewith advantageously fixes the lance tube until the pressure buildup in the interior is correspondingly greatly reduced. At the same time, such a pressure piston also operates advantageously by arresting the lance tube during normal operation as well. A mounting of the lance tube additionally securing the lance holder is therewith created which also makes safe handling possible in extreme situations.
According to an appropriate construction of the invention, it is provided that an oxygen stop valve is arranged in front of the pressure piston, advantageously with an integral slag run back safety device. This oxygen stop valve closes off the interior of the lance holder and ensures that oxygen cannot flow back into the lance holder in the event the slag run back safety device is called upon.
As was indicated above, there are several solutions for the activation of the lance mounting. That is, the adjusting facility can be variously constructed but nonetheless accomplish the objective with appropriate finesse. According to an appropriate construction, it is provided that the pressure casing, constructed in two parts, as is known, has a housing with compressed air connection and with a clamp dog releasing the collet against the tension of a tension spring, and that the cylinder space allocated to the clamp dog is connected with the safety blocking piston through a feeder conduit serving as a bypass. The activation of the lance holder takes place, as is known, by the action of compressed air upon the clamp dog. The clamp dog slides against the force of the tension spring and therewith releases the collet so that the lance tube situated in the lance holder can be removed and be replaced by a new one. If now, for example, pressure has built up in the lance holder due to the lance tube being blocked, this is released by force and discharged because the compressed air flows through the cylinder space and the feeder conduit flows into the safety blocking cylinder and opens it. The connection between atmosphere and interior of the lance holder is thereby created and the dangerous excess pressure in the interior of the lance holder can be reduced.
A secure reaction of the safety blocking piston is attained in that the feeder conduit is connected acting upon the locking piston of the safety blocking piston, whereby the locking piston is held in the closed position by a compression spring. The compressed air flowing in through the feeder conduit slides the locking piston against the force of the compression spring and therewith brings it into a closed position. A dangerous excessive pressure in the lance housing can thereby be reduced. In normal operation of the lance holder, the safety blocking piston necessarily remains open until the compressed air supply is stopped and the clamp dog is released. The necessary pressure is therewith lacking in the feeder conduit, and the compression spring can close the closing piston of the safety blocking piston.
Simple and safe handling of such a lance holder is improved in that the compressed air connection on the housing has available a coupling pin which is constructed subject to action over an inserted shut-off coupling. As long as the shut-off coupling is slid up the coupling pin, compressed air can be introduced. If the administration of compressed air is to be concluded, the shut-off coupling is simply withdrawn and the clamp dog is therewith released once again. The shut-off coupling closes automatically so that compressed air no longer flows in.
The sealing casing mentioned above, which is surrounded by the pressure piston and therewith also squeezed by this, ensures that the lance tube is additionally sealed and above all arrested, and also then still held owing to this arresting when the collet must be released to reduce an excessive oxygen pres

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