US1587727A - Rotary drier - Google Patents

Description

June 8, 1926.

W. A. HARTY ET AL v ROTARY DRIER Filed Sept. 30, 1925 Patented June 8, 1926.

UNITE STATES r'rsn'r orFicE.

WILLIAM A. HARTY, 0F BLASDELL, NEVJ YORK, AND FRANK WV. MOORE, OF THOROLD,

ONTARIO, CANADA.

ROTARY DRIER.

Application filed September Our present invention involves an improvement of our hot mandrel drier which forms the subject matter of our co-pending reissue application, filed Oct. 16, 1925, Serial No. (329%.

as set forth therein, the action of the hot mandrel or core makes possible a very high degree of efliciency whereby large bUllICS of material, formerly so expensive to handle, may be dried out thoroughly in, a very rapid, continuous action so that in the case of a plant of large output the final drying can keep pace with production, thus pre venting accumulation in the plant or yard with delays in completion and delivery. I

Remarkable as were our first embodiments in their performance, we have been able by study and experiment to produce driers of even higher elficiency than those first made.

In such an industry as that in which our invention had its first inception (the manufacture of abrasives) the drying; is the bottle neck of the plant and any relief of congestion at that point is of vital importance in production. The urgent desire was to gain more speed where speed was proven so important by our first devices. Careful study showed our hot mandrel principle to have capacity even bevond our first hopes. The thick, conductive. radiant core was found to possess heat factors in excess of simple feeds and speeds. ltseems now that it is only necessary to secure a continuous reversion to the mandrel during the transit of the material and the speed. of flow can be increased correspond ingly.

Our present improvements are in this direction. To illustrate our latest and best results we show in the accompanying drawembodiments that illustrate the principle which seems involved in the advance we h are made by our present invention. In the drawings and specification, like reference ch lacters are employed to indicate correspond]. 3; parts, and in the drawings:

Fig. 1 shows a battery installation.

L 2 is a unit in side elevation partly secti ned.

Fig. 3 is a transverse section of the same on the line 8-3, of Fig. 2, and

Fig. i a similar section illustrating a variant, and

Fig 5 is an enlaryed detail partly in section showing the blast and flame of the nozzle.

In general construction, our present drier, as shown in the embodiment illustrated in the drawing, is very similar to that of our previous Letters Patent. As shown, it comprises an outer shell 1 havino" an intake end 1. and a discharge end I". The drier may be provided with any type of feed as in our previous patent, or may be fed by hand by simply shovelling material into the end 1", as is frequently done in simple uses of the drier. The outer shell is provided with circumferential bearing tracks 2, and may be rotated by gear, belt or sprocket. As here shown, the drive is by sprocket and chain, a sprocket 3 being bolted to the shell 1. I

\Vithin the shell 1, as heretofore, we dispose our core or mandrel 4, which preferably extends entirely through the shell. Burner nozzles 5 are so disposed as to project the flame into the intake end of the core or mandrel at so that the mandrel can be heated both by the direct contact with the flame, which extends well along its length, as well as by its conductivity. The mandrel. is preferably of cast iron construction and in accordance with our present invention is provided with specially shaped flanges for keeping the material more in contact with the mandrel as it is rotating. These flanges may be any desired form, depending upon the drying problem. As shown in F 3, the flanges are T-shaped, as indicated at 6. and may be simply welded to the mandrel l. Coacting with these are flanges 7 on the inner face of the shell 1 by which the material is thrown inward as the shell rotates so as to come in contact with the core.

In the modification shown in Fig. i, the flanges 61 are curved, and as shown in said figure, are formed on sections of a surround ing shell indicated at 8. This shell is made up of longitudinal sections having the flanges 61 adapted to abut against a supporting web 9 disposed between them and cast, welded or otherwise secured to the core or mandrel proper 4. Such a construction is used where materials are to be dried which might suffer from direct contact with the red hot core or mandrel l. With many materials this is not necessary and with the surrounding shell the drying is somewhat slower. The form shown in Fig. 4, thereform hot-h illustrates a variation in the -form of the flange 6 which is somewhat hooked or anchor shaped, and shows the double core or mandrel;

The burner may be of any' desired type, but preferably is an oil burner of the type wherein the combustion of oil takes place at the burner nozzle. This burner is so placed as to project a long tongue or intense flame within the mandrel 4-.

As heretofore, our driers are capable of being made in a very compact and light term. In fact, they are readily portable and et in do'rta'b'le sizes have a ca fiacit in in J te'ry and which connectwith a stack or flue 12. v I l The proportioning of the flanges 6 or 6 may be varied for different materials, as may also the lorm and disposition of the flanges 7 In the forms shown, the construction. is particularly well adapted for the handling of granular material and abrasives or like i aterial in finely divided form. Upon rotationot the shell 1 the flanges 7 direct the material onto the hot core and the flanges 6 tend to retain the material more intin'iately in contact with said core as it rotates with the outer shell 1. On each rotation, the material is eventually dropped to the bottom of the shell to again be picked up and thrown onto the core during each rotation.

In installing or setting up these driers, the re mounted on a slight incline which may be varied in accordance with the speed or flow of thematerial desired;

Various other n'iodifications may obviousl he made in the construction of the flanges while preserving the combination as illustrated herein and as defined by our clan-us.

.Vhat we therefore claim -and desire to secure by Letters Patent is:

1'. A drier comprising a rotary shell and a hollow internal coi'iductive mandrel extending through said shell and rotating therewith, a burner nozzle disposed in a-linenient with the hollow mandrel to project a flame therein at the intake end 01 the drier and flanges longitudinally of said mandrel and comprising radial ribs and lateral retaining members on said ribs.

2. A drier comprising a rotary shell and an internal heating mandrel extending through said shell and rotating therewith, longitudinal ribs on said mandrel substantially T-shaped in cross section, and a burner disposed at the mandrel end and discharging a flame into the mandrel.

3. A drier comprising a rotary shell and a hollow internal conductive mandrel ex tending through said shell and rotating therewith, a burner nozzle'disposed in alinement with the hollow mandrel to project a flame therein at the intake end 01'' the drier and said mandrel comprising longitudinal sections having marginal flanges and comprising radial abutting ribs and lateral retaining members on said ribs.

In testimony whereof we a-flix our signatures. I

\VILLIAM A. HARTY. FRANK V. MOORE.

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