US3762657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously operating agitator ball mills
Assignee: Willy A Bachofen AG
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Filing: 1972-05-18
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Granted: 1973-10-02
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Expires: 1992-05-18
Abstract
Abstract An agitator ball mill including an annular stator assembly and a co-axially mounted rotor is disclosed. A first annular member is mounted on the stator and a second annular member is mounted on the rotor shaft. The position of the second annular member along the shaft is determined by a demountable spacer member to provide coarse adjustment of the width of a gap defined between mutually facing axial surfaces of the first and second annular members. Coolant is applied to the stator to cause controllable axial contraction of the stator relative to the shaft. This relative contraction increases the width of the gap and thus provides a fine adjustment of the width, so as to prevent grinding bodies from passing through it, whilst permitting material ground in the mill by the bodies to pass through the gap and thereby become separated from the grinding bodies.
Inventors
- 👤 Martin K Schieritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:55
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/16; B02C17/18; B02C17/1815; B02C25/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
145 words
An improvement in an agitator ball mill, the improvement comprising in combination; a generally annular stator assembly including a first annular member; a rotor shaft mounted co-axially with respect to said stator assembly; a second annular member mounted on said rotor shaft to rotate therewith; a demountable spacer member axially locating said second annular member relative to said stator assembly; and a passage through said stator assembly for circulating a cooling medium to cause the stator assembly to contract axially relative to said rotor shaft and thereby increase the width of a gap defined between mutually facing axial surfaces of said first and second annular members; whereby the width of said gap may be adjusted to prevent grinding bodies from passing through said gap whilst permitting material ground in the mill by the bodies to pass therethrough and thereby become separated from the grinding bodies.
Claim 2
Dependent Claim
145 words
An improvement in an agitator ball mill, the improvement comprising in combination; a generally annular stator assembly including a first annular member; a rotor shaft mounted co-axially with respect to said stator assembly; a second annular member mounted on said rotor shaft to rotate therewith; a demountable spacer member axially locating said second annular member relative to said stator assembly; and a passage through said stator assembly for circulating a cooling medium to cause the stator assembly to contract axially relative to said rotor shaft and thereby increase the width of a gap defined between mutually facing axial surfaces of said first and second annular members; whereby the width of said gap may be adjusted to prevent grinding bodies from passing through said gap whilst permitting material ground in the mill by the bodies to pass therethrough and thereby become separated from the grinding bodies.
Claim 3
Dependent Claim
20 words
An agitator ball mill as defined in claim 1, wherein said first and second annular members each comprise wear-resistant material.
Claim 4
Dependent Claim
26 words
An agitator ball mill as defined in claim 1, wherein said grinding bodies comprise balls, each said ball having a diameter of less than 0.2 millimetres.
Claim 5
Dependent Claim
31 words
An agitator ball mill as defined in claim 1, wherein said rotor shaft comprises an inner shaft and a hollow outer shaft mounted co-axially on said inner shaft to rotate therewith.
Claim 6
Dependent Claim
23 words
An agitator ball mill as defined in claim 4, comprising at least one agitator member mounted on said inner shaft to rotate therewith.
Claim 7
Dependent Claim
34 words
An agitator ball mill as defined in claim 4, wherein said second annular member is mounted co-axially on said inner shaft to rotate therewith and to be restrained from axial displacement with respect thereto.
Claim 8
Dependent Claim
28 words
An agitator ball mill as defined in claim 4, wherein said outer shaft is rotatably mounted in said stator assembly by a pair of axially spaced bearing means.
Claim 9
Dependent Claim
30 words
An agitator ball mill as defined in claim 7, wherein each said bearing means comprises a ball bearing assembly provided with an inner ball race and an outer ball race.
Claim 10
Dependent Claim
39 words
An agitator ball mill as defined in claim 8, wherein said ball bearing assembly adjacent said second annular member comprises a double-ball bearing, of which said outer ball race is restrained from axial displacement relative to said stator assembly.
Claim 11
Dependent Claim
70 words
An agitator ball mill as defined in claim 1, wherein a generally annular collecting cavity for receiving ground material passed through said gap is defined between an end portion of said stator assembly and said rotor shaft, said collecting cavity being closed by a pair of axially spaced lip sealing members mounted on said stator assembly and contacting a shaft protecting sleeve fitted tightly but removable on said rotor shaft.
Claim 12
Dependent Claim
55 words
An agitator ball mill as defined in claim 10, wherein a further annular cavity is defined between said pair of lip sealing members, and wherein there is provided means for circulating coolant through said further cavity for dissipating heat produced by friction between said lip sealing members and the surface of said shaft protecting sleeve.
Claim 13
Dependent Claim
30 words
An agitator ball mill as defined in claim 4, wherein said inner shaft is secured against axial displacement by a nut engaging a threaded end portion of said inner shaft.
Claim 14
Dependent Claim
42 words
An agitator ball mill as defined in claim 12, wherein removal of the nut from said end portion of said inner shaft permits the latter, together with components of said rotor assembly mounted thereon, to be withdrawn from said hollow outer shaft.
Claim 15
Dependent Claim
44 words
An agitator ball mill as defined in claim 1, wherein said passage through said stator assebmly comprises a generally annular chamber co-axial with said rotor shaft, said chamber being provided with an inlet and an outlet for circulating the cooling medium through said chamber.
Claim 16
Dependent Claim
35 words
AN agitator ball mill as defined in claim 1, comprising temperature sensing means responsive to the temperature of the cooling medium exceeding a predetermined value to automatically disable drive means for rotating said rotor shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |