US1295288A - Grinding-mill. - Google Patents

Description

J. S. FASTING.

GRINDING MILL.

APPLICATION FILED AUG. I2. 1916.

Patented Feb. 25, 1919.

A rra/vns TED STATES Jot-[AN s. FASTING, or EEEDERIKsisEEG, NEAR COPENHAGEN, DENMARK, nssrcrNon T0 F. L. SMIDTH & 00., OFNEW Yonx. N. A CORPORATION or NEW JERSEY.

GRINDING-MILL.

Specification of Letters Patent. 7

Patented Feb. 25,1919.

Application filed August 12 1916. Serial No. 114,504.

To all whom it may concern:

Be it known that I, JonAN Srcrsiioxn Fxsrnso, a subject of the King of Denmark, residing at Frederiksberg, near Copenhagen, Denmark, have invented certain new and useful Improvements in Grinding-Mills, of which the following is a specification, reference being had to the accompanying drawing, forming a part thereof.

In another application filed by the present applicant there is described a method of grinding in tube mills in which the grinding is carried on with separation of the charge of grinding bodies and material to be ground into parallel, circumferential streams by means of partitions transverse to the axis of the mill, so that a frictional drag between the grinding bodies and the mill is exerted not only upon those grinding bodies in each stream which lie against the circumferential wall of the mill, but also upon the grinding bodies at each side of each stream which lie against the transverse partitions which separate adjacent streams.

In another application there are shown and described certain specific forms of partitions which may be employed in a mill adapted for the practice of the method referred to and certain specific means for securing such partitions in place Within the shell or drum of the mill, so that such partitions shall perform efliciently their desired function and shall also be held securely in place and yet be capable of bein whenever desired or purposes of renewal or repair. In the resent application there is shown a form 0 partition ring generally similar to that shown in the application last referred to, but whereas in such other application the securing devices between adjacent ends of adjacent ring sections were shown as common to the that one section could not be removed without disturbing the adjacent sections, in the present case each ring section is held in lace by securing devices which are independent of the adjacent ring sections and their securing devices, so that any one section may be removed without disturbing any of the other sections, while all of the advantages incident to the construction of the rings and their securing devices as show-n in such other application, such as the provision of only two bearing points for each section with consequent capacity for free removed and replaced two sections, so I expansion and contraction without theimposition of undue strains on any of the associated parts, and the provision of a single bearing block for the bearing feet at the adjacent ends of two adjacent sections, constituting a unit mill, are retained. The invention willbe more fully explained hereinafter with reference to the accompanyin drawing in which it is illustrated and in w ich,-. v

Figure 1 is a partial view in longitudinal central section of a tube mill towhich the present inventionmaybe applied.

Fig. 2 is a fragmentary detail in crosssection of a mill such as that shownin Fig. 1, but on a larger scale, illustrating the construction of one of the partition rings, and means for securing it in place. 5

Fig. 3 is a detail view in section ,oiithe plane indicated by the line 3.-3 of Fig. 2.

The cylindrical shell. or drum a of the mill shownin part in Fig. l'is mounted for rotation on a horizontal axis in substantially the usual manner and has secured within it annular partitions of the mill, which are spaced in parallelism with the ends of the .mill and with'each other at such distances as to divide the whole charge of grinding bodies and material to be ground into comparatively narrow, circumferential streams, as the mill to tates on'its axis in the usual manner, so as to bring about a frictional drag between the grinding bodies and the partitions on the'o'pposite sides or lateral faces of each of the lining for the.

b, transverse to the axis between such grinding bodies and the circumferential wall of the mill. for the purpose of securing, as described in the first application above mentioned, an increase of the relative movement between different grinding bodies and a reduction of slippage between the whole mass of the charge and the walls of the mill.

Each of the annular partitions is formed in separate ring sections. preferably fourin number, which are slightly separated from each other at their ends, are supported against the outer wall of the mill at two points only, so that each section may expand and contract freely without the imposition of undue strains on any of the associated parts, and are secured by such means that any one section may be removed without disturbing any of the other sections.

. adjacent ends of two adjacent ring sections a, such ring sections being preferably spaced apart somewhat at their ends, as clearly shown in Fig. 2. Each foot 0 is Wide enough, in the direction of length of the drum, to maintain.the ring section in a POSl'.

tion at right angles to the axis of the drum when the ring section is drawn tightly against the step d by the bolt f, which is passed through the flanged foot 0', through the step d, and through the shell a and receives, outside of the shell, a nut f. Each ring section is preferably perforated, as at a, and may also be notched on its outer periphery, to permit the passage of the ground material and, it may be, of the grinding bodies also, from one circumferential stream to the next.

It will be observed that all of the ring sections are maintained firmly in proper position, that each of the ring sections may expand or contract without affecting any of the other ring sections and withoutundue strain upon the wall of the mill, and that any'section may be removed and replaced without disturbing any of the other sections.

I claim as my invention:

1. An annular partition for a grinding mill comprising a plurality of ring sections, each section being separated by a space from the next in a circumferential direction,

whereby each section may expand without affecting adjacent sections, and means to Secure each section to the wall of the mill.

2. An annular partition for a grinding mill comprising a plurality of ring sections, each ring section having two convex feet, convex upon a shorter radius than that of the mill, to bear against the Wall of the mill at. circumferentially separated points, and means to secure each section to the Wall of the mill independently of any other section. 1

3. An annular partition for a grinding mill comprising a plurality of ring sections each havmg two feet to bear against the Wal of the mill nearthc ends of the section, and bearing steps set into the lining of the mill to furnish each a bearing for the feet at two adjacent ends of adjacent ring sections.

4. In a grinding mill the combination of a shell or drum, an annular partition comprising a plurality of ring sections, each ring section having two feet to bear against the wall of the mill at circumferentially separated points, and bolts passing through such feet and the wall of the'mill and receiving nuts onthe outside of the shell or drum.

5. In a grinding mill the combination of a shell or drum, an annular partition comprising a plurality of ring sections, each ring section having feet nearitsends to bear against thewall of the mill, steps set into .the wall of the mill to form bearings for the feetat the adjacent ends of adjacent ring sections, and bolts passed through the feet of the ring sections, the steps and the wall of the mill, and receiving nuts on the outside of the wall of the mill.

This sp)ecification signed this 9th day of May, A. 1916.

JOHAN s. FASTING.

Images