US688018A - Fritz hundeshagen - Google Patents

Description

(No Model.)

4 [NVENTOR W1 TNESSES:

I Af/of'ney m: NORFUS PETERS ca. PHQ'IO-UTHO" WAsHmGT UNITED STATES PATENT OFFICE.

FRITZ HUNDESHAGEN, OF MULHEIM-ON-THE-RHINE, GERMANY.

BALL GRINDING-MILL...

$PEGIFIOATION forming part of Letters Patent No. 688,018, dated December 3, 1901.

' Application filed August 6, 1901. Serial No. 71,033 (No model.)

T0 at whom it may concern.-

Be it known that I, FRITZ HUNDESHAGEN, a citizen of Saxony-Weimar, residing at Mulheim-on-the-Rhine, Germany, have invented certain new and useful Improvements in Ball Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. I

The present invention relates to grist-mills wherein the material to be ground is comminuted by the action of a number of balls arranged within a drum, the said material being subjected to the attrition between the balls and the walls of thedrum.

The object of the present invention is to provide means whereby the material to be ground is gradually fed forward from the supply end of the drum to the point of delivery and to make such feed regulatable and consistent with simplicity of construction. Such a feed of the material has hitherto been effected by inclining the axis of the drum of the mill, and the velocity of the feed was governed by the difference of height between the two ends of the drum or, in other words, the incline of thesame.

Under the present invention the feed is effected and regulated without resorting to any inclination of the drum; but thetravel of the material is brought about by providing the interior. of the periphery of the drum with suitable inclined grooves or gutters, said inclined grooves being arranged in zones, which Zones extend the length of the drum. Between each zone or inclined groove is preferably arranged an annular groove or trough. By this arrangement the-material in process of grinding is caused to fall out of the inclined or annular grooves, where the latter are employed, and as the walls of the drum rise above the level of the contents of said drums the material in each inclined groove tends to slide forward to thedelivery end of the drum, and so that a portion of the same will reach a position in the said drum, where it will subsequently be taken up by the grooves in the next zone, and so on.

Other features of the invention will be set forth hereinafter.

In the accompanying drawings, Figure 1 represents a vertical longitudinal section of a ball grinding-mill embodying my invention; Fig. 2, a transverse section of the same; and Fig. 3 a view ofthe inner periphery of the drum of said mill, developed or spread out into a plane.

By referring to the drawings it will be noted that the ball-mill embodying my invention. comprises a drum A, horizontally journaled, as shown, said drum being filled to the proper level with the grinding-balls a, the material to be ground being fed into the drum through the upper or feed end B and delivered from the mill at the point of discharge C. At the feed and delivery end the said drum is', provided with the helical con.- veyers b' and 'o of the shown construction and arranged in the feed and delivery throats B and O.

The parts thus far described are well known in the art; but my invention consists in the arrangement now to be described.

As seen by reference to the drawings, the inner periphery of the drum A is divided into a series of zones 1 which zones start at vertical annular grooves or troughs (1. Between these annular grooves d are arranged the inclined grooves or channels d, the number of inclined grooves or channels d in each zone being governed by the speed with which it is desired to feed forward the grist material. In order to adjust the amount of feed, it is preferred to provide a number of inclined grooves cl, corresponding to the greatest amount of feed. Whenit is desired to reduce the speed, a number of these inclined grooves are closed up or obliterated by se curing in them strips or plugs e, as shown in Fig. 1, whichstrips may be held in place in any suitable manner. In order to retard the amount of feed, particularly at the delivery end of the drum, a number of grooves or channels dflinclined oppositely to the inclined grooves 01, may be arranged in the zones D, as shown in Fig. 3. v

The mode of operation of a ball-mill constructed in accordance with the above is as follows: The portion of the material undergoing the grinding process occupies the grooves 61, d, and 61 while these grooves arein their lowermost position. Shortly after the lower end of such grooves d and d emerges above the level of the contents of the mill the ma,-

terial in the annular grooves cl belowsuch lower end drops back into the drum, whereupon the material in the inclined grooves 01' and d slides down the respective grooves into the vacant space thus created and forms heaps, I 'where it is discharged from the respective grooves, asiindicated in Figs. 1 and 2.

Since the contents of the inclined grooves are derived from the material which is included within the respective zone to which said inclined grooves belong, between two annular grooves cl and d, which bound such zone, and

- is continually deposited atthe boundary-line of said zones, the propelled grist material consequently viscaused to move forward by the width of a. zone on an average,'and for the grooves (1' such movement is always toward the delivery end. Since this operation is continually repeated, the entire contents of the mill are gradually fed forward, while at the same time its comminution progresses and the parts are subjected to the most intimate com minglin g. As stated above, this feed may be somewhat retarded by the inclined grooves 02 A further regulation is effected by the mil cerns. The principle underlying the present invention,however, enables me to provide a mill which can be adaptable for large or for I inexpensive mannerwith reference to the quantity and the fineness of the product.

What I claim, and desire to secure by Letters Patent of the United States, is

1. In a ball-mill, a drum, provided on its interior periphery with a series of zones of incliued grooves or channels for feeding the grist. material.

2. In a grist-mill, adrum, provided on its interior periphery with a series of annular grooves in combinationwith inclined grooves, arranged Within and communicating with the annular grooves.

' 3. In a grist-mill, a drum, provided on its interiorperiphery with a series of inclined grooves in combination with removable blocks or bars, arranged to be secured in the said grooves.

4. In a ball-mill, a drum, provided on its interior periphery with inclined grooves for feeding the material forward, in combination with grooves inclined in an opposite direction, for retarding the feed.

In testimony whereof I affix my signature in presence of two witnesses.

FRITZ I-IUNDESI-IAGEN.

Witnesses:

CHARLES LE SIMPLE, CARL SoHMI'rT.

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