US466882A

US466882A - Territory

Info

Publication number: US466882A
Authority: US
Publication date: 1892-01-12
Anticipated expiration: 1909-01-12

Description

(No Model.) 2 Sheets-Sheet 1.

J. E. SHETTLE.

ROTARY ORE ROASTER.

No. 466,882. Patented Jan. 12, 1892.

INVENTOR:

W .ITNESSES:

WWW w W W I i .Alttorney.

UNITED STATES PATENT OFFICE.

,mii HAW...

JULIUS E. SHETTLE, OF SALT LAKE CITY, UTAH TERRITORY.

ROTARY ORE-ROASTER.

SPECIFICATION forming part of Letters Patent No. 466,882, dated January 12, 1892.

Application filed June 18, 1891- Serial No- 396,712. (No model.)

To aZZ whom it may concern.-

Be it known that I, J ULIUS E. SHETTLE, a' citizen of the United States, residing in the city and county of Salt Lake, in the Territory of Utah, have invented certain Improvements in Rotary Ore-Roasters, of which the followin g is a specification.

My invention relates to the class of rotarycylinder roasters for ores, wherein the ore enters at one end, passes through,'and is discharged at the opposite end, whereat the furnace-gases enter.

The object of my invention is to provide the cylinder with outlets for the ore at the discharging end and with means for automatically opening and closing the outlets.

The invention will be fully described hereinafter, and its novel features carefully defined in the claim.

In the accompanying drawings, which serve to illustrate my invention, Figure 1 is a side elevation of the roaster, some of the brickwork being represented in section. Fig. 2 is an end View of the ore-receiving end of the rotary cylinder, the view being taken from the plane indicated by the dotted line 2 52in Fig. 1. Fig. 3 is a vertical transverse section taken in the plane indicated by the dotted line 3 3 in Fig. 1. Fig. 4 is a detached plan view of the automatic opener. Fig. 5 is a face view, on a large scale, of one of the gravitydoors and its rotary latch; and Fig. 5 is a side or edge view of the same.

A is what I will call the cylinder, although I prefer to make it slightly tapered or conical, as shown. This cylinder is of metal, lined with fire-brick or other suitable refractory material. It rests on rollers a a, and is rotated slowly when in use through the medium of a worm-wheel a, a worm a and a pulley a on the worm-shaft. This is the common mode of rotating such cylinders.

B is the furnace from which the gases pass into and through the cylinder A, passing thence into the flue or uptake 0 at the ore-receiving end of the cylinder. The cylinderA may be of any desired length. Usually it will be from twenty to forty feet long and have a diameter of from four to seven feet. As before stated, it will be slightly tapered by preference, being largest at the furnace end or ore-discharging end. In Fig. 1 it is represented as broken away at the middle part to illustrate that it may vary in length.

So far as above described the construction is the same as or similar to that commonly employed.

The ore is delivered into the cylinder A through an inclined spout b, and when it reaches the discharging end of the furnace it is discharged by gravity through the discharge-outlets c,(seen in Fig. 3,) whence it falls into the banking-pit D. The outlets c, of which thenumberand size maybe variable, are in the wall of the cylinder near the end Where the furnace-gases enter, and these outlets will be by preference equally distributed about the circumference of the cylinder, as best seen in Fig. 3. Each outlet 0 will have a hinged cover d arranged exteriorly to the cylinder and adapted to open by gravity when unlatched or freed. Figs. 5 and 5 represent the cover d and its rotary latch c on a comparatively large scale. The latch c has a boss which turns on a stud e and three equallyspaced arms which radiate from said boss. When the latch e is turned so as to stand as represented in full lines in Fig. 5, one of its arms takes over the cover (1 and holds it closed; but when said latch is turned as represented in dotted lines in said figure-that is, so that neither of the arms overlap the cover d-the said door is then free to open by gravity when brought. to the under side of the cylinder by the rotation of the latter.

The latch e is actuated automatically by means that I will now describe.

Suppose the cylinder A to be rotating in the direction of the arrow 2 in Fig. 3. Then an outlet 0 reaches apoint directly under the axis of the cylinder, (the cover cl being meanwhile held closed by the latch 6,) the latch e is rotated through about one-sixth of a revolution by the contact of one of its arms with an unlocking-bar g. (Seen detached in Fig. 4.) This movement of the latch frees the cover d,'which falls and allows some portion of the ore to pass out and down into the pit D. Fig. 3 shows the open door just after it has passed the latch-bar. As the cylinder continues to rotate the door (Z graduall closes again, and when it is about on a level with the axis of the cylinder it will have again closed. At this point (at 00 in Fig. 3) an arm on the latch encounters ahooked locking-bar 7b, which acts to rotate the latch through about one-sixth of a revolution or sufficient to again cause an arm of the latch to take over the cover d and hold it against dropping open. The bars g and h are stationary and act by detaining an arm of the latch, whereby the rotation of the cylinder effects a partial rotation of the latch about its stud. These bars 9 and h may be fixed in position; but Ipreter to pivot the unlocking-bar g on a cross-frame 2 or on some other fixed part, so that its operative end may be turned out of the-path of the latch, in which case the covers will not be released and the ore Will not be discharged for the time.

By this mechanism I provide for the automatic discharge of the ore in a continuous manner, thus avoiding the overheating of the ore collected at the hottest part of the cylinder. With a cylinder provided with my continuous automatic discharge the heating of the ore is substantially uniform. Thus I avoid the loss of metal by Volatilization and through the'carrying off of the dust with the 25 draft.

Having thus described my invention, I claim- In a rotary ore-roaster, the combination,

with the rotatively-mounted cylinder A, pro- 0 vided with a series of discharging-outlets for the ore, with pivoted covers cl for said outlets, adapted to open by gravity, and with rotary latches e for holding said covers closed, of the unlocking-bar g and locking-bar h, adapted 3 5