Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1998-04-21
1999-08-31
Walberg, Teresa
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
414588, F27B 916
Patent
active
059445149
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process for feeding bulk material onto a belt of a rotary hearth furnace that has hoods which cover the belt 58 as to form a ring, as well as a suitable device for this purpose.
2. Discussion of the Prior Art
Furnaces of this type demand an even temperature in the furnace chamber at the lowest possible consumption of energy. The removal device and, especially, the charging device, are of particular importance in this regard. From DE 33 12 467 C2, for example, a furnace for heating material is known that has a transport device in the area of the door opening for the purpose of feeding and removing the material, as well as a plurality of gripping devices that can feed the material to be heated from the transport device through the furnace openings to the contents of the hearth support located in the furnace, or remove the material. This known furnace is a so-called hearth bogie furnace, i.e., one in which material is not transported on a circular conveyor.
From EP 0 058 736 B1, a rotary hearth furnace with a heating device to produce a hot zone is known, which has a device that constitutes a feed-in station, via which parts can be introduced into the furnace.
Neither of these devices makes it possible to place bulk materials onto the furnace belt. Such a device is known from EP 0 259 510 B1. In this case, a screw device is used; however, this device is used to carry away the material.
Here, too, as is generally the case, the feeding of the bulk material is carried out by means of transport belts or chutes. In the present case, the material is passed onto the hearth belt via a lid (not described further).
SUMMARY OF THE INVENTION
The object of present the invention is to provide a process and a corresponding device for covering the belt of a rotary hearth furnace with bulk material at a very low layer thickness relative to the belt width, in a careful and reliable manner.
Pursuant to this object, and others which will become apparent hereafter, one aspect of the present invention resides in a process for feeding bulk material onto a belt of a rotary hearth furnace which has hoods that cover the hearth belt so as to form a ring. The process includes the steps of depositing the bulk material on a transport device at a layer thickness proportionally dependent on a distance to a center of the rotary part so that a cross-sectional area of the bulk layer material conically tapers to the center of the hearth, setting the transport device to a speed at least three times greater than that of the hearth belt, smoothing the surface of the bulk material on the transport device, and distributing the bulk material on the hearth belt at a constant layer height over the entire width of the hearth belt.
Another aspect of the invention resides in a device for feeding bulk material onto a hearth belt of a rotary hearth furnace. The device includes hoods that cover the hearth belt so as to form a ring. The ring has a cutout at a feeding point of the rotary hearth furnace. Means are provided for transporting the bulk material. The transporting means are arranged above the hearth belt and have a material discharge edge arranged perpendicular to a direction of movement of the hearth belt. The transport means operate at a transport speed which can be set, relative to the hearth belt speed, inversely proportional to layer heights of the bulk material. Furthermore, means are arranged in an area of the discharge edge of the transport device for smoothing a surface of the bulk material. The smoothing means is arranged at an angle relative to a middle of the rotary hearth furnace above the transport device so as to define a constant cross-sectional area of the bulk material. Finally, means are arranged in front of the smoothing means in the transport direction for depositing the bulk material in a cross-section that tapers conically to the hearth center.
According to the invention, the feed-in device is constructed so that material supply is divided up i
REFERENCES:
patent: 3667746 (1972-06-01), Makarov et al.
patent: 3988012 (1976-10-01), Jemal
patent: 4579525 (1986-04-01), Ross
patent: 5019689 (1991-05-01), Bollier et al.
Cepin Hermann
Herre Gerd
Pohl Ulrich
Schmieden Hartmut
Mannesmann Aktiengesellschaft
Walberg Teresa
Wilson Gregory A.
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