Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Reexamination Certificate
2000-01-10
2001-07-31
Wilson, Gregory (Department: 3749)
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
C432S121000, C432S137000
Reexamination Certificate
active
06267588
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a longitudinal continuous furnace applicable to construction material. The use of which lies in its configuration as a mechanism that causes the drying and baking of the clay with which the construction ceramic material is manufactured so that it acquires its own characteristics.
BACKGROUND ART
The invention permits the drying and baking of clay by means of providing heat that uses pressurized air as the conductor element. This characteristic gives it good performance and effectiveness for the work entrusted. At the same times the configuration as a longitudinal and continuous furnace provides the invention with a high degree of automation of the drying and baking process and avoids time associated with conventional discontinuous furnaces.
The invention has its scope within the industry dedicated to the manufacture of industrial furnaces. More specifically within the industry dedicated to the manufacture of industrial furnaces, the present invention applies to construction ceramic materials.
Manufacture of construction ceramic material is based on two fundamental activities: molding and baking. The first of which is normally carried out by introducing the unworked clay under pressure into molds in the hollow shape of the brick section it is desired to form, and obtaining a continuous form of plastic clay that is subsequently cut into the desired lengths by means of a wire or similar.
So that the clay has homogeneous properties and does not have air bubbles, it is made to pass through rollers located before being molded under pressure. This is usually carried out by means of an endless screw that places the clay in the above described molds.
Once the plastic and wet clay bricks are obtained in the length and sections desired, they are grouped together and placed in a furnace which first dries them at moderate temperature and then bakes them at an appreciably higher temperature.
The furnaces normally used are of the discontinuous and very large type which must be heated before placing the load of bricks to be dried and baked inside them. After approximately thirty hours, the heat supply is cut off and the furnace is slowly cooled in order to extract the product.
The process is slow and the size of the furnaces, although directly dependent on the capacity of the plant, is usually very large.
It would be advisable to have furnaces applicable to the manufacture of construction ceramic material that decreased the time the product is inside them and that reduced their general size. These improvements would give rise to a proportional decrease in the investment, proportional to the size, and in the operating costs, proportional to the time the bricks are inside the furnace.
The applicant, on the other hand, has no record of the existence of longitudinal continuous furnaces specifically applicable to the drying and baking of construction ceramic material.
SUMMARY OF THE INVENTION
The longitudinal continuous furnace applicable to construction ceramic material, constitutes an obvious novelty within its field of application. It allows the drying and baking of construction ceramic material in a substantially shorter time than the conventional discontinuous furnaces applicable to this field, and with a smaller-sized furnace the characteristics indicated as desirable for a device of this type are thus obtained.
More specifically, the invention consists of a main body of the furnace in the shape of a very long and squared section tunnel. The furnace is inside with refractory bricks and provided with rails on the floor along which low speed wagons that transport groups of bricks through it circulate.
There are two types of devices on the lateral walls of the main body of the furnace that inject air, inside. There are nozzles located on one of the interior lateral faces that blow hot air coming from gas burners located outside. On the opposite internal face, there are fans that blow outside air at ambient temperature which, together with the previous ones, obtain spiral currents. The axis of the currents is parallel to the large size of the main body of the tunnel.
In this way, the hot air in motion reaches all the points of the bricks conveyed on the wagons, accelerating the drying and baking processes in comparison to the conventional furnaces. In other words, while the transmittal of heat in traditional furnaces is basically made by radiation, in this invention it is made by convection.
The calories provided inside the invention by the nozzles can be regulated by varying the gas flow burnt per unit of time in same. Thus the temperature throughout the main body of the furnace can be varied at will, creating a drying area with a suitable temperature in the initial area of the main body of the furnace, followed by a second high temperature area suitable for the baking of the bricks and a third area, in the final section of the main body of the furnace, with progressive temperature reduction in order to reach slow cooling of the bricks so that stresses in bricks are not created.
The speed of the wagons must be studied so that, due to the length of the main body of the furnace, the time the bricks are inside said furnace is suitable.
REFERENCES:
patent: 3854865 (1974-12-01), Fay
patent: 4136624 (1979-01-01), Kato et al.
patent: 4177035 (1979-12-01), Buschermohle
patent: 4240788 (1980-12-01), Naito et al.
Harrison & Egbert
Wilson Gregory
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