US944997A

US944997A - Pebble-mill.

Info

Publication number: US944997A
Application number: US48224309A
Authority: US
Inventors: Max F Abbe
Original assignee: Individual
Current assignee: Individual
Priority date: 1909-03-09
Filing date: 1909-03-09
Publication date: 1909-12-28
Anticipated expiration: 1926-12-28

Description

M. F. ABBE.

PEBBLE MILL.

APPLICATION mum HA3. 9. 1909.

Patented Dec.28,1'909.

NITED STATES OFFICE.

MAX 1?. ABBE, or NEW YORK, N. Y.

rEBBLE-numa.

I Spgcificationof Letters Patent. Patented Dec. 28,1909.

Application filed March.9, 1909. Serial No. 482,243.

This invention-relates to a coniform pebble mill more particularly adapted for wet grinding, and so constructed that the material'to be ground is directly fed into that soT portion of the mill which has the greatest grinding coefficient. y

In the accompanying drawing: F igure 1 is longitudinal section ofmy improved pebble mill; Fig.2 an end View thereof; Fig.3 a vertical cross section on line 33, Fig. 1, and Fig. 4 a side view, partly in section, of a modification of the mill.

The shell or barrel 10, forming the grinding chamber of the mill, is composedof two frusto-conical sections joined attheir base, sothat the shell tapers from the center toward both ends These ends terminate in hollowtrunnions 11,.turning in bearings 12 of standards 13. Shell 10 contains pebbles, balls or similar grinding bodies 14 which are confinedwithin the grinding chamber.

by grates 15 formed on discharge nozzles 16. hese nozzles. are fitted into trunnions ll andv are bolted thereto, as at 17.

As described in a companion application filed on even date herewith, pebbles 14 will 'so arrange themselves automatically during the operation of the mill, that they will pile up at that portion thereof whichflhas the Furthermore, as the pebbles are usually of different sizes, the larger pebbles will here gather, while the pebbles will gradually diminish in size toward nozzles 16. Thus, withthe constructionsh'ow'n -in Fig. 1, the largest pebbles will be heaped lip-at the centerof the'mill to exercise the greatest grinding force, such force gradulally diminishing toward the discharge nozz es.

be ground to that port-ion of the mill which attacks the same most effectively, the center of shell 10, 2'. e., that portion thereof which has'the greatest diameter is provided with .a peripheral inlet opening communicating with a casing '18 that encompasses the grindmg chamber. ;.-'This casing mcloses a helical conveyer 19, the convolutes of which gradexpenditure of power.

Inorder to directly feed the material to ually decrease in radius and are maintained in vertical uxtapos1t1on. Casing-18 encompasses shell 10 at its greatest diameter and'is fitted between apair of flanges QOof shell 10, to which it is bolted, as at 21. v

The outer convolute of conveyer 19 is pro- ;vided with a replaceable .scoopor mouthpiece 22 which dips into a trough 23 arranged below casing 18 and containing the material to be ground. The inner convolute of the conveyer communicates with the peripheral inletopening of the shell which contains a removable grate 24, through which the material to be ground is admitted to the grinding chamber, while the escape of pebbles 14: is prevented.

When the mill is rotated by a gear wheel 25 and a suitable power-shaft, (not shown), the material to be ground will, by conveyer 19, be carried to the center of the mill, to be here subjected to the most intense grinding action, while the, more or less comminuted particles will undergo'a further reduction as they are forced toward discharge nozzles 16. In this way the grinding capacity of the mill is fully utilized with a minimum In Fig. 4, the shell 26 of the mill is of frusto-conical form, so that it is widest, not at the center, but at one of its ends. 1 Here too the material to be ground is fed to the grinding chamber through a helical couveyer 27, inclosed within a casing 28 which is fitted to the widest portion of the shell, so that the grinding capacity of the mill is fully utilized.

I claim:

1. A pebble mill comprising a coniform shell having a" peripheral inlet opening at the widest portion thereof, a pair of supporting bearings, means for axially rotating the shell, grinding bodies inclosed within the shell, a casing encompassing the shell at the'widest portion thereof, a spiral conveyer within the casing and communicating with the inlet opening, and a trough into which said conveyer is, adapted to dip -2. A pebble mill comprising a coniform' shell having-a peripheral inlet opening at the widest portion thereof, a pair of trunnions, one of which is hollow, .means for axially rotating the shell, grinding bodies inclosed within the shell, a casing encompassing the shell at thewidest ortion thereof, a spiral conveyer within tlFe casing and a trou hinto which said conveyer is adapteral inlet opening.

- y 1 communicating with the inlet opening, and 1 portion and communicating with the periph- [0 ed to ip. Signed by me at New York city, (Man- 3. A pebble mill comprising a coniform hatt-an,) N; thls 8th day of March, 1909.

axially rotatable shell having a peripheral M AX E ABBE. inlet opening at its widest ortion, grinding Witnesses; v means mclos'ed within'the ell, and a spiral FRANK BRIESEN,

I conveyer encompassing the shell at its widest E W SCHORR,