DE35271C - Method of making pear bottoms - Google Patents

Description

IMPERIAL

PATENT OFFICE

CLASS 18: Ironmaking.

The previous production of the basic pear bottoms is done in layers and tamping down the basic mass in a soil mold in such a way that the individual layers to the needles respectively. Nozzles form a right angle.

In spite of the most careful scraping of the firmly tamped layer for a better connection with the next one it cannot be avoided that with a lower tar content the basic mass, the individual tamped layers can still be clearly seen after the soil has burned mark, and that as a result of the mechanical effects of liquid iron and the strong pressed wind a lifting of the individual soil layers in the pear and so that a rapid destruction of the soil is brought about. Has this disadvantage one sought to remedy this by adding as much tar as possible to the dolomite and thus a basic mass is processed, which due to its soft, almost rigid liquid However, the nature of the transition from one tamped layer to the other is less marked. Soils produced in this way alone are too porous and contain too much carbon after firing.

The wind passing the nozzles burns the carbon and carries it through it associated nozzle expansion (formation of a flute) causes rapid destruction of the floor.

Both inconveniences can be avoided by that a mass with a lower tar content is pulped in such a way that one Side wall of the pear base respectively. in the case of a round shape, the jacket surface is the ramming base forms. In this way, a stratification of the floors, which respectively the nozzles, is obtained. is parallel to the incoming wind.

To achieve this, both halves of the base must be used in the case of round bases Manufacture in two separate molds and join them together before or after firing, if necessary, a binder consisting of a thin slurry of dolomite dust and tar is to be used.

It is more useful, however, to give the floors a square shape and to shape them to produce square bottom forms that can be opened at the side.

In the drawing, _s is the ramming base, ο the upper open side, which is closed after the completion of the ramming of the soil by an identical side piece as u or by a simple plate. The round wall b forms the actual floor area of the floor after the floor has been completed and is used with the floor at the same time in the appropriate opening of the pear. The needles η lie in horizontal planes and are inserted into plates b and c successively with the tamping. The cross-sections are indicated by hatching.

Claims (2)

Patent claims: ι. Process for the production of pear bottoms, characterized by the pulping of the mass in such a way that a side wall resp. a part of the outer surface of the soil form forms the ramming base for the purpose of achieving layers at an angle to the soil surface b. 2. In this process the use of divisible resp. laterally opening bottom molds, to from the divided respectively. make the tamping on the opened side to be able to.