US1080629A - Rotary drier. - Google Patents

Description

L. F. GRISWOLD & O. B. SMITH.

ROTARY DRIER.

APPLICATION P'LLED 1,11;

Patented Dec. 9, 1913.

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L. P. GRISWOLD & C. B. SMITH.

ROTARY DRIER APPLICATION FILED JAN 2. 1913.

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LQJIS FRED GRISWOLD AND CECZL BASS SMITH, 0F CLEVELAND, OHIO; SAID GRIQTSW'GLU ASSIGNGEZ T0 SAID SMITH.

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Application filed January 2, 1913.

T0 QZZ .1)ii077bii may ooncewz Beit known that we, Louis lnso Giuswow and CECIL Bass SMITH, both citizens of the United States, and residents of Cleveland, in the county of Cuyahoga and State of Ohio,have jointly invented anew and useful Improvementin Rotary Driers,of which the following is a specification.

Our, invention relates to direct heat rotary driers, for drying sand, cement, tankage, etc and so far as our knowledge of the art extends, heretofore the I most satisfactory driers of the class have been constructed with the drying cylinder set on an incline, and provided internally with lifting blades or other suitablemeans: for cascading or agitating the material. The cylinders are inclined for thepurpds'eof causing the material to gradually trav el'from the feed end tothe discharge end of the cylinder. In order to obtain the desired result, of thoroughly drying the material, it has been necessary to make these cylinders fromtwenty to fifty feet in length, to retain the material in the cylinder a sufficient length of time to dry. The cost of driers of this construction, and the large amount of space which they occupy, confines their sale almost wholly to large plants whose owners have more or less extensive capital and makes them prohibitive to many would be users, who have small capital and limited floor space. A

The objects of vide a direct heat drier at a comparative low cost, that is simple and durable in construction, efficient in its operation, and compact and self-contained, making it easy to install, and adapting it to the requirements of small plants, without in the least reducing the efliciency or materially reducing the per diem capacity in the drying of material of certain qualities.

Another object of the invention is to pro vide means for feeding the material from z'he hopper .to the drying cylinder, whereby the. said material subjected to beneficent effects of the heat, beforeit enters the cylfinder.

A further object of the invention is the providing of means for-tempering the gases entering the cylinder, whereby the temper ature can he kept under perfect control, which is very desirable fact-oi in the drying of delicate materiaL Specification of Letters Patent.

this invention are to prov mder, causes the material contalned therein Patented Doc. 9, 191 3. Serial No. 739,745.

Still another object of the invention is to provide means for closing the gas inlet to the cylinder, and thereby causing the action of the suction draft to produce a partial vacuum within the cylinder, which expedites the drying of the material.

Other objects and advantages of the invention will be made apparent from the following specification, considered in connection with the accompanying drawings, in Wl11Cl1- i Figure 1 is a longitudinal, vertical section through the complete apparatus, excepting the drying cylinder, which is shown with only a portion of the heads in section, and thesuction fan being shown in outline elevation. Fig. 2 is an end view, partially in section on line 2, 2 of Fig. 1, and Fig. 3 is a fragmentary view illustrating a modified form of feeding means.

Throughout the drawings and specification, numerals are employed for designating toe different cooperating accessories.

An important feature of the invention is the eccentric, oblique rotation of the cylin der, and while we are aware that tl1is con struction is old as applied to devices used for other purposes, it has not, to our knowledge, heretofore been applied and employed to be thrown about from end to end, and in.

all directions, thereby subjecting all parts of it to the heat imparted from the cylinder casing, and permitting the gases that enter the cylinder to commingle with, pass through the disintegrated mass as it is agitatcd by the tumbling process.

Referring now to the drawings, 1 represents a housing which is superimposed relative to the furnace 2. The housing forms a chamber 3 which is in open communication with the furnace 2, through the openings 2 in the furnace arch.

The drying cylinder 4 is closed at both ends by the heads 4? and 4". trunnion 5 is rigidly attached to the cylinder head 4 eccentric to the center line thereof, and a trunnion G is rigidly attached to the head 4", eccentric ,to. the center line thereof, and obliquely to the trunnion 5. The trunnions 'erating in the hollow trunnion 5 and 6 are mounted in suitable bearings 7 aim giroc Fig. i s" n r vto the interior or tr pening 4 in the eylznder ii A registering with the opening in ie trunnion 5. A. suction fan 10, or other suitaole suction draft means is arranged in open. connection with the passage The cylinder lead i" is provided with an opening I, the trunnion 5 is provided with a (fllilllllw. 6 with which the opening & coniniunicat pass throng (i into the chamber A valve 11 is provided "for pening and closing the opening d It will be readily understood, that, when the valve 11 is open, the heated gases from the chamber 3 will be drawn by the suction fan 10 through the openings 6" and i, into the interior of the drying cylinder, and out through the passage 5. \Vhen the valve 11 is closed, the action of-the. suction fan will produce a partial vacuum in .thetlrying cylinder, the advantage of which will hereinafter be'mentione-d.

A novel method of feeding the material into the drying cylinder is'provided by a spiral conveyer 12, connected with, and op- 5; this conveyer extends into a depending portion 13 of the hopper 13. The material from the thrbugh the s into the cylinder 4:, and is eirpos to the heated gases being drawn by the suction tan, through the said passage. in the opposite direction; The material after being dried is discharged through an opening in the cylinder head t", which is provided with a suitable closure member, adapted to be removed, and so constructed that it can be replaced and tightly locked during the rotation of the cylinder.

@116 or more openings 1% are provided in the housing 1, through which external air can be admitted to the chamber and by commingling'with the heated gases, reduce the temperature. he supply of air through the openings it is regulated and controlled by suitable dampers.

\Vhile the p material to the d the hollow trunnion shown in Fig. t'ni: housing 1, and dome suitable sealin In the opera red manner of feeding the ting cylinder, is through the feed may be otherwise made fast tothe 5 "es from the chamber a hatch 15, in the provided with a .the nriterial is te l into the cylinder, which. imparts heati operation of the apparatus,

drying cylinder, to the extent of approximately one-third of the capacity of said cylinder. As the cylinder is rotated the material is agitated by be ing tumbled about in all directions. The gases from the furnace heat the shell of the to the material In the first sta es of the if the wave 11. is

contained therein.

closed the drying etl'ect of cylinder shell is enhanced by the partial vacuum produced by the suction fan 10. After the material has been dried to a certain extent, which depends on the nature of the material, the valve 11 is opened and the heated gases pass through the'cylinder and complete the drying process. If the temperature is found to be too high, it may be regulated by the dampers in the openings 14..

While we have, in this specification, de-

scribed and shown an apparatus embodying the principles of our invention, we do not intend to be limited to this particular conihe heat from the struction, only in so far as required by the scope of the claims, and the'existing state of the art to which the apparatus appcrtains.

hat we claim and clesire to secure by Letters Patent is- 1. In a rotary drier, a drying cylinder adapted to rotate eccentrically and obliquely to the rotation of the driving member, whereby the material to be dried is agitated, in combination with means for drawing a heating and drying medium through the interior of said cylinder.

2.111 a rotary drier, 'a drying cylinder adapted to rotate eccentrically and obliquely to the rotation of the driving member whereby the material to be dried is agitated,

in combination with an opening or openings for admitting heat to the interior of said cylinder, suction means for drawing the heat through the interior of the cylinder, and means for closing the admission openings whereby the suction means will cause a partial vacuum in said cylinder.

3. In a rotary drier, a drying cylinder adapted to rotate eccentrically and obliquely to the rotation of the driving member whereby the material to be dried is agitated tion with an inclosing chamber in E -r rotates means for sup- 7 chamber, means for e cl'iai'nl;-er through the cans for ad- "ily of non ier wherein combit ea ed, exterior air to the end n t by the temperature of the medium within said chamber and the cylinder is reduced.

t. In a rotary drier, the combination of a drying cylinder, an inclosing chamber in which said cylinder is adapted torotate, trunnions eccentric-shy and obliquely at the two heads of said cylinder mil itable beariags, a longitudinal opening in one of the trunnions and its at- ,tached cylinder head, suction draft means connected with the interior of the cylinder through the said opening, open communication from the chamber to the interior of the cylinder through the opposite trunnion and cylinder head, whereby heat from the chamber isdrawn through the cylinder, means for feeding material to be dried to said cylinder, and means for discharging the dried material therefrom.

5. In a rotary drier, the combination of a drying cylinder, an inclosing chamber in which said cylinder is adapted to rotate, means for supplying heat to said chamber, a hollow trunnion eccentrically attached to one head of said cylinder, open communication from a suction draft means, through the hollow trunnion to the interior of the cylinder, means for feeding material to the interior of the cylinder through the said hollow trunnion, a trunnion attached eccentrically to the opposite head of the cylinder and in oblique relation to the first named trunnion, open communication from the chamber to the interior of the cylinder through the last named cylinder head, and means for closing said opening.

6. In a rotary drier the combination of a drying cylinder; an inclosing chamber in which said cylinder is adapted to rotate;

means for supplying heat to said chamber; t-runnions attached to the opposite heads of the drying cylinder and mounted in suitable bearings, whereby said cylinder is revolved; a longitudinal opening in one of the trunnions and its attached cylinder head at the feed end; a spiralconveyer attached to the trunnion within said opening, whereby the material is fed to the interior of the cylinder by the revolution of the trunnion; means for admitting heat from the chamber to the interior of the cylinder; and suctiondraft means connected with the cylinder at th feed end thereof. LOUIS FRED GRISWOLD.

CECIL BASS SMITIL Witnesses W. A. CAREY,

W. G. MOORE.

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