# US 7,744,027 B2 · Planetary ball mill

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- Number: US 7,744,027 B2
- Document ID: US7744027B2
- Status: Granted
- Kind: B2
- Application number: 11/675,526
- Filed: 2007-02-15
- Published: 2008-08-21
- Granted: 2010-06-29
- Earliest claimed: 2007-02-15
- Assignees: Nagao System Inc.
- Inventors: Fumiyoshi Nagao
- Web page: https://patentgrep.com/patent/US7744027B2

## CPC

- B02C 17/08: with containers performing a planetary movement
- B02C: CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN ({household tools and machines for pulverising foodstuffs, e.g. coffee and spice mills A47J42/00; pharmaceutical mortars A61J3/02; mechanical processing of refuse and garbage B03B9/06; dressing mould materials by grinding B22C5/04}; obtaining metallic powder by crushing, grinding or milling B22F9/04; {recovery of plastics by disintegrating B29B17/00; crushing raw materials in starch making C08B30/02; beaters for papermaking D21D1/02; crushing devices specially for transport in mines E21F13/002; slag crushing devices F23J1/00; fuel milling devices in combustion apparatus F23K1/00; household devices for crushing coal F24B15/02; ice disintegrating devices F25C5/02})

## Abstract

A planetary ball mill includes: a revolution turning arm turned about a revolution shaft rotated by a driving force; mill pots each supported on the revolution turning arm so as to be rotated about a rotation shaft inclined from the vertical direction toward the side of the revolution shaft; and an outer circumferential pot receiver which is disposed fixedly on the upper side of the revolution turning arm along the whole part of a circumference around the revolution shaft and with which the outer peripheral surfaces of the mill pots revolving attendantly on the turning of the revolution turning arm make contact, whereby the mill pots are put into rotation.

## Claims

### Claim 1

A planetary ball mill comprising:
a revolution turning arm turning about a revolution shaft rotated by a driving force;
a mill pot turnably supported on said revolution turning arm through a rotation shaft inclined at an inclination angle from the vertical direction toward the side of said revolution shaft;
an outer circumferential pot receiver which is fixedly disposed on the upper side of said revolution turning arm over the whole part of a circumference around said revolution shaft and with which an outer peripheral surface of said mill pot revolving attendantly on the turning of said revolution turning arm makes contact, whereby said mill pot is put into rotation; and a plurality of grinding medium balls.
wherein an inside bottom of said mill pot has a concave spherical shape,
a rotational speed of the mill pot is higher than a revolutional speed of the revolution turning arm, and
a revolutional centrifugal force of the revolution turning arm and a rotational centrifugal force of the mill pot inclined at the inclination angle cause; the grinding medium balls and matter to be ground in the mill pot to climb upward, while spinning at high speed, along the inside surface of the mill pot inclined at the inclination angle.

### Claim 2 (depends on 1)

The planetary ball mill as set forth in claim 1,
wherein an inside side wall of said mill pot is provided with a recess.

### Claim 3 (depends on 1)

The planetary ball mill as set forth in claim 1,
wherein the part of said outer circumferential pot receiver, with which said mill pot makes contact, has a non-circular shape which deviates from a locus of revolution around said revolution shaft, and said rotation shaft is swingably supported on said revolution turning arm so as to swing in the radial direction of a circle centered on said revolution shaft.

### Claim 4 (depends on 1)

The planetary ball mill as set forth in claim 1,
wherein an outer peripheral surface of said mill pot, which makes contact with said outer circumferential pot receiver, has a non-circular shape centered on said rotation shaft, and said rotation shaft is swingably supported on said revolution turning arm so as to swing in the radial direction of a circle centered on said revolution shaft.

### Claim 5 (depends on 1)

The planetary ball mill as set forth in claim 1,
wherein the angle of inclination of said rotation shaft from the vertical direction is in the range of 15 to 40 degrees.