CA1146517A - Centrifugal mill - Google Patents
Centrifugal millInfo
- Publication number
- CA1146517A CA1146517A CA000359646A CA359646A CA1146517A CA 1146517 A CA1146517 A CA 1146517A CA 000359646 A CA000359646 A CA 000359646A CA 359646 A CA359646 A CA 359646A CA 1146517 A CA1146517 A CA 1146517A
- Authority
- CA
- Canada
- Prior art keywords
- drum
- axis
- grinding drum
- generally conical
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
- B02C17/08—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container with containers performing a planetary movement
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Crushing And Grinding (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
ABSTRACT
A centrifugal mill comprises a cylindrical grinding drum, which performs a rotation about its own axis and a revo-lution in a circular orbit about a stationary axis of revo-lution, which is parallel to the axis of the drum, at a cons-tant speed ratio between said rotation and revolution. The distance form the drum axis to the axis of revolution is smaller than the radius of the grinding drum. A feeder is provided at one end of the grinding drum. Discharge means are provided at the other end of the grinding drum. The feeding and discharge zones of such mill are subjected to wear and grinding elements may be thrown out of the mill. This is prevented in that the grinding drum is provided at each end with a generally conical extension, a volute feeder is mounted on the generally conical extension at the feed end, and the generally conical extension at the discharge end is provided with discharge openings in its peripheral wall near its axially outer end.
A centrifugal mill comprises a cylindrical grinding drum, which performs a rotation about its own axis and a revo-lution in a circular orbit about a stationary axis of revo-lution, which is parallel to the axis of the drum, at a cons-tant speed ratio between said rotation and revolution. The distance form the drum axis to the axis of revolution is smaller than the radius of the grinding drum. A feeder is provided at one end of the grinding drum. Discharge means are provided at the other end of the grinding drum. The feeding and discharge zones of such mill are subjected to wear and grinding elements may be thrown out of the mill. This is prevented in that the grinding drum is provided at each end with a generally conical extension, a volute feeder is mounted on the generally conical extension at the feed end, and the generally conical extension at the discharge end is provided with discharge openings in its peripheral wall near its axially outer end.
Description
,.; ~E4 The presen~ invention relates to a centrifugal and particularly to a centrifugal mill comprising a cylindrical grinding drum, which performs a rotation about its own axis and a revolution in a circular orbit about a stationary axis - of revolution, which is parallel to the axis of the drum, at a constant speed ratio between said rotation and revolution, the distance from the drum axis to the axis of revolution being smaller than the radius of the grinding drum, further comprising a drive mechanism for rotating the grinding drum about the drum axis and for revolving the grinding drum in the circular orbit, a feeder provided at one end of the grinding drum, and discharge means provided at the other end of the grinding drum.
Published German Specification 2,631,826 discloses a centrifugal mill which is of the kind described first hereinbefore and comprises a cylindrical grinding drum and is charged by means of a funnel-shaped feeder through a vertical end portion of the drum. The discharge means of that known mill consist of an overflow pipe disposed in the other vertical end portion of the drum. If the grinding drum is vertically arranged, central openings for charging the drum and for discharging from the drum are provided in the horizontal end plates of the grinding drum. The discharge means may include a discharge volute, which returns coarse material into the grinding drum.
Published German Specification 2,~47,578 also describes such centrifugal mill which has a horizontal grinding drum which in one vertical end portion has a central opening, in which a feeder is disposed, whereas the other vertical end portion of the drum has a central opening, which contains an overflow pipe.
These mills are subjected to wear in the feeding ' .
.
and discharging zones, and grinding balls may be thrown out of the drum.
It is an object of the invention to reduce the wear in the feeding and discharging zones and to prevent grinding elements from being thrown out of the drum.
This object is accomplished in accordance with the invention in that the grinding drum is provided at each end with a generally conical extension, a volute feeder is mounted on the generally conical extension at the feed end, and the generally conical extension at the discharge end is provided with discharge openings in its peripheral wall near its axially outer endA
The generally conical extensions may be coaxial to the grinding drum and to the open ends thereof. Each conical extension may consist of a plurality of sections, which are secured one behind the other. This will facilitate the assembling and disassembling as well as the acces~ to the grinding drum.
The inlet opening of the volute faces preferably upwardly. The inlet opening is preferably so dimensioned and arranged that during the revolution of the grinding drum in its orbit the edge of the opening remains clear from an area which is sufficient for a stationary feeding. If the grinding. If the grinding drum is horizontally disposed and the opening is reactangular, the distance between the two edges which are parallel to the axis of the grinding drum must exceed in that case the diameter of the circular orbit.
In such an arrangement it is not required, e.g., to provide a flexible feeder, which is connected to the opening.
Accord-ing to a preferred feature, the volute of the feeder lies in a plane. This will result in a particularly uniform feeding of the charge into the grinding drum.
:
11~L6517 According to a preferred feature, that portion of the generally conical extension whch is provided with the discharge openings is cylindrical. This results is a parti-cularly uniform discharge.
According to a preferred feature, a collecting " channe,l which has a directed discharge opening is secured around that portion of the generally conical extension which is provided with the discharge openings. In that case the discharged matter will be collected in a simple manner and can be removed from a single point.
According to a preferred feature, the discharge openings in the generally conical extension consist of slots.
This will also contribute to a uniform discharge.
An embodiment of the invention will be explained in detail but in a non limitative manner with reference to the drawings, in which Fig. 1 is a diagrammatic longitudinal sectional view showing a horizontally disposed grinding drum;
Fig. 2 is a transverse sectional view taken on line A-A in Fig. 1, Fig. 3 is a transverse sectional view taken on line B-B in Fig. lj Fig. 4 is a longitudinal sectional view taken on line C-C in Fig. 5 and showing a modification, in which that portion of the generally conical extension which is provided with discharge openings in cylindrical.
Fig. 5 is a transverse sectional view taken on line D-D in Fig. 4.
Conical extensions 2a and 2b are secured to the grinding drum at its feed 1 and its discharge end 1, - respectively. A volute feeder 3 is mounted on the extension 2a. Discharge slots 4 are provided in the extension 2b in the .
:
conical wall close to its axially outer end,.
The volute 5 is disposed in one plane in the feeder 3. In the embodiment shown in Fig. 4, that portion of the extension 2b which is provided with discharge openings is ' cylindrical and surrounded by a collecting through 7, which has a downwardly facing discharge opening 8.
The advant~ges afforded by the invention reside in that the wear in the feeding and discharge zones is greatly reduced, that a throwing, of grinding elements out of the drum is avoided, and that a highly uniform feeding and discharge are accomplished as well as substantial increase in throughput.
'' ' .
.. . .
'.~
Published German Specification 2,631,826 discloses a centrifugal mill which is of the kind described first hereinbefore and comprises a cylindrical grinding drum and is charged by means of a funnel-shaped feeder through a vertical end portion of the drum. The discharge means of that known mill consist of an overflow pipe disposed in the other vertical end portion of the drum. If the grinding drum is vertically arranged, central openings for charging the drum and for discharging from the drum are provided in the horizontal end plates of the grinding drum. The discharge means may include a discharge volute, which returns coarse material into the grinding drum.
Published German Specification 2,~47,578 also describes such centrifugal mill which has a horizontal grinding drum which in one vertical end portion has a central opening, in which a feeder is disposed, whereas the other vertical end portion of the drum has a central opening, which contains an overflow pipe.
These mills are subjected to wear in the feeding ' .
.
and discharging zones, and grinding balls may be thrown out of the drum.
It is an object of the invention to reduce the wear in the feeding and discharging zones and to prevent grinding elements from being thrown out of the drum.
This object is accomplished in accordance with the invention in that the grinding drum is provided at each end with a generally conical extension, a volute feeder is mounted on the generally conical extension at the feed end, and the generally conical extension at the discharge end is provided with discharge openings in its peripheral wall near its axially outer endA
The generally conical extensions may be coaxial to the grinding drum and to the open ends thereof. Each conical extension may consist of a plurality of sections, which are secured one behind the other. This will facilitate the assembling and disassembling as well as the acces~ to the grinding drum.
The inlet opening of the volute faces preferably upwardly. The inlet opening is preferably so dimensioned and arranged that during the revolution of the grinding drum in its orbit the edge of the opening remains clear from an area which is sufficient for a stationary feeding. If the grinding. If the grinding drum is horizontally disposed and the opening is reactangular, the distance between the two edges which are parallel to the axis of the grinding drum must exceed in that case the diameter of the circular orbit.
In such an arrangement it is not required, e.g., to provide a flexible feeder, which is connected to the opening.
Accord-ing to a preferred feature, the volute of the feeder lies in a plane. This will result in a particularly uniform feeding of the charge into the grinding drum.
:
11~L6517 According to a preferred feature, that portion of the generally conical extension whch is provided with the discharge openings is cylindrical. This results is a parti-cularly uniform discharge.
According to a preferred feature, a collecting " channe,l which has a directed discharge opening is secured around that portion of the generally conical extension which is provided with the discharge openings. In that case the discharged matter will be collected in a simple manner and can be removed from a single point.
According to a preferred feature, the discharge openings in the generally conical extension consist of slots.
This will also contribute to a uniform discharge.
An embodiment of the invention will be explained in detail but in a non limitative manner with reference to the drawings, in which Fig. 1 is a diagrammatic longitudinal sectional view showing a horizontally disposed grinding drum;
Fig. 2 is a transverse sectional view taken on line A-A in Fig. 1, Fig. 3 is a transverse sectional view taken on line B-B in Fig. lj Fig. 4 is a longitudinal sectional view taken on line C-C in Fig. 5 and showing a modification, in which that portion of the generally conical extension which is provided with discharge openings in cylindrical.
Fig. 5 is a transverse sectional view taken on line D-D in Fig. 4.
Conical extensions 2a and 2b are secured to the grinding drum at its feed 1 and its discharge end 1, - respectively. A volute feeder 3 is mounted on the extension 2a. Discharge slots 4 are provided in the extension 2b in the .
:
conical wall close to its axially outer end,.
The volute 5 is disposed in one plane in the feeder 3. In the embodiment shown in Fig. 4, that portion of the extension 2b which is provided with discharge openings is ' cylindrical and surrounded by a collecting through 7, which has a downwardly facing discharge opening 8.
The advant~ges afforded by the invention reside in that the wear in the feeding and discharge zones is greatly reduced, that a throwing, of grinding elements out of the drum is avoided, and that a highly uniform feeding and discharge are accomplished as well as substantial increase in throughput.
'' ' .
.. . .
'.~
Claims (5)
1. A centrifugal mill comprising a cylindrical grinding drum, which performs a rotation about its own axis and a revolution in a circular orbit about a stationary axis of revolution, which is parallel to the axis of the drum, at a constant speed ratio between said rotation and revolution, the distance from the drum axis to the axis of revolution being smaller than the radius of the grinding drum, further comprising a drive mechanism for rotating the grinding drum about the drum axis and for revolving the grinding drum in the circular orbit, a feeder provided at one end of the grinding drum, and discharge means provided at the other end of the grinding drum, characterized in that the grinding drum is provided at each end with a generally conical extension a volute feeder is mounted on the generally conical extension at the feed end, and the generally conical extension at the discharge end is provided with discharge openings in its peripheral wall near its axially outer end.
2. A centrifugal mill according to claim 1, characterized in that the volute of the feeder is disposed in a plane.
3. A centrifugal mill according to claim 1 or 2, characterized in that portion of the generally conical extension which is provided with the discharge openings is cylindrical.
4. A centrifugal mill according to claim 1 or 2, characterized in that a collecting channel which has a directed discharge opening is secured around that portion of the generally conical extension which is provided with the discharge openings.
5. A centrifugal mill according to claim 1 or 2, characterized in that the discharge openings in the generally conical extension consist of slots.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2936208.1 | 1979-09-07 | ||
| DE19792936208 DE2936208A1 (en) | 1979-09-07 | 1979-09-07 | CENTRIFUGAL MILL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1146517A true CA1146517A (en) | 1983-05-17 |
Family
ID=6080309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359646A Expired CA1146517A (en) | 1979-09-07 | 1980-09-05 | Centrifugal mill |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0025238A1 (en) |
| JP (1) | JPS5645767A (en) |
| AU (1) | AU6208580A (en) |
| CA (1) | CA1146517A (en) |
| DE (1) | DE2936208A1 (en) |
| IN (1) | IN151923B (en) |
| NO (1) | NO802426L (en) |
| ZA (1) | ZA805516B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3224098A1 (en) * | 1982-06-29 | 1983-12-29 | Metallgesellschaft Ag, 6000 Frankfurt | Centrifugal mill with horizontal, cylindrical grinding drum |
| JP3002476U (en) * | 1994-01-20 | 1994-09-27 | 大島工業株式会社 | Ball mill |
| CN100389053C (en) * | 2005-11-09 | 2008-05-21 | 中国铝业股份有限公司 | Partitioned compartment type ore feeder |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE204949C (en) * | ||||
| US2549919A (en) * | 1947-06-06 | 1951-04-24 | Smidth & Co As F L | Airswept rotary mill or drum having separate discharge means for air and ground material |
| US3027104A (en) * | 1961-02-28 | 1962-03-27 | Newton L Hall | Horizontal rotary grinding mill with floating load-partition |
| FR1289073A (en) * | 1961-05-04 | 1962-03-30 | Kloeckner Humboldt Deutz Ag | Crusher for fine crushing of natural or synthetic materials |
| DE2631826A1 (en) * | 1975-09-10 | 1977-03-24 | Chamber Of Mines Services Ltd | CENTRIFUGAL MILL |
-
1979
- 1979-09-07 DE DE19792936208 patent/DE2936208A1/en not_active Withdrawn
- 1979-11-22 IN IN1223/CAL/79A patent/IN151923B/en unknown
-
1980
- 1980-08-08 EP EP80200755A patent/EP0025238A1/en not_active Withdrawn
- 1980-08-13 NO NO802426A patent/NO802426L/en unknown
- 1980-09-05 AU AU62085/80A patent/AU6208580A/en not_active Abandoned
- 1980-09-05 ZA ZA00805516A patent/ZA805516B/en unknown
- 1980-09-05 CA CA000359646A patent/CA1146517A/en not_active Expired
- 1980-09-06 JP JP12394480A patent/JPS5645767A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0025238A1 (en) | 1981-03-18 |
| DE2936208A1 (en) | 1981-03-26 |
| AU6208580A (en) | 1981-03-12 |
| NO802426L (en) | 1981-03-09 |
| JPS5645767A (en) | 1981-04-25 |
| IN151923B (en) | 1983-09-03 |
| ZA805516B (en) | 1982-04-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |