Metallurgical apparatus – Means for treating ores or for extracting metals – By means applying heat to work – e.g. – furnace
Patent
1995-08-21
1997-07-08
Kastler, Scott
Metallurgical apparatus
Means for treating ores or for extracting metals
By means applying heat to work, e.g., furnace
266200, C21B 700
Patent
active
056457910
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a charging material preheater for preheating charging material for a metallurgical smelting plant.
DESCRIPTION OF THE PRIOR ART
A charging material preheater similar to that disclosed herein is known from DE-A1-39 40 558. In the lower region of a shaft-like container the known charging material preheater has mutually oppositely disposed closure members which are pivotable by a control member and which each include fingers or grid bars which are arranged in parallel spaced relationship to each other, the fingers or grid bars being mounted in a mounting which is supported on a frame structure of the container and being pivotable downwardly from a closed position in which inner portions of the fingers project into the interior of the container into a release position in which said portions of the fingers face downwardly and permit material to pass through the container.
With that charging material preheater, when the closure members are in the closed position, it is possible for charging material to be retained in the container and heated by hot gases which are passed therethrough, while after the heating operation, the charging material can be emptied into a metallurgical vessel disposed therebeneath by pivotal movement of the closure members into the release position.
In the known charging material preheater the shaft-like container is of a rectangular cross-section.
EP-B1-0 291 701 discloses a charging material preheater having a shaft-like container which is fixed in a frame structure and which in the lower region has mutually oppositely disposed closure members which are pivotable by a control member and which each include grid bars arranged in parallel spaced relationship with each other, the grid bars being mounted in a first rotary mounting which is supported on the frame structure, wherein the grid bars are mounted in the carrier beam member rotatably about a horizontal axis and elastic supports are associated with the grid bars at the points of entry into the container.
By virtue of that configuration of a charging material preheater, it is possible on the one hand to control the severe shock loadings when charging material is introduced into the container, insofar as such loadings are carried by elastic supports and transmitted into the frame structure of the container, while in addition by virtue of the individual mounting of the grid bars in the carrier beam, it is possible to replace a damaged grid bar without operation of the charging material preheater having to be interrupted for that operation.
SUMMARY OF THE INVENTION
In the case of the charging material preheater of the kind set forth in the opening part of this specification, the grid bars or fingers of each closure member are in the form of cantilevered carriers, which are clamped in position at the end, of a rotatable drum mounted in a mounting which is supported on the frame structure of the container. Particularly in the case of high shaft-like containers, that results in a heavy mechanical loading on the rotary mounting and control members if for example heavy scrap drops on to the fingers from a height of 4 meters. Even if the mounting is fixed in the frame structure, with the incorporation of shock absorbers, it is not possible to guarantee the desired service life, in relation to shock loadings of that kind.
In a charging material preheater of the kind set forth in the opening part of this specification, the object of the invention is to pass the shock forces which act on the closure members when charging material is introduced directly into the frame structure without thereby loading control members. The invention also aims to reduce the loading on the rotary mountings of the fingers in the frame structure and thus increase the durability thereof. The invention further seeks to provide that the a design structure permitting the use of shock absorbers with a greater spring travel.
In accordance therewith the fingers of a closure member are mounted rotatably in their central port
REFERENCES:
patent: 3379424 (1968-04-01), Dellagnese et al.
patent: 3379425 (1968-04-01), Dellagnese et al.
patent: 4547099 (1985-10-01), Alexandrov et al.
patent: 4852858 (1989-08-01), Weber
patent: 5153894 (1992-10-01), Ehle et al.
patent: 5201941 (1993-04-01), Wells
International Search Report for PCT/EP 94/02405 Dec. 28, 1994.
Ehle Joachim
Fuchs Gerhard
von Ploetz Klaus
Fuchs Systemtechnik GmbH
Kastler Scott
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