US4212429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and an apparatus for controlling a crusher
Assignee: Societe Miniere et Metallurgique de Penarroya
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Filing: 1978-03-15
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Granted: 1980-07-15
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Expires: 1998-03-15
Abstract
Abstract A method and apparatus for controlling an autogenous or semiautogenous crusher, in which the quantity of charge within the crusher is determined continuously. The speed of rotation of the crusher is controlled in accordance with a function which links the speed of rotation of the crusher to the quantity of the charge in the crusher. In a preferred embodiment, the charge is determined from the resistance experienced by the motor which drives the crusher. This resistance is a linear function of the charge within the crusher. The control apparatus provides an electrical signal which is proportional to the quantity of charge and the electrical signal is then used to control the speed of rotation of the crusher.
Inventors
- 👤 Jean-Philippe Cuvelier
- 👤 Henri Gistau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:31
CPC Classifications
B; B02; B02C; B02C25/00; B02C17/00; B02C17/18; B02C17/1805
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A method for controlling an autogenous or a semi-autogenous crusher, in which the charge within the crusher is continously determined, and the speed of rotation of said crusher is controlled in accordance with a function which links said speed of rotation to said charge and in which said charge is determined from a resistance to rotation experienced by a motor which drives said crusher, and in which said resistance is determined by the ratio between the power absorbed by said motor and the speed of rotation of said crusher.
Claim 2
Independent Claim
89 words
A method for controlling an autogenous or a semi-autogenous crusher, in which the charge within the crusher is continously determined, and the speed of rotation of said crusher is controlled in accordance with a function which links said speed of rotation to said charge and in which said charge is determined from a resistance to rotation experienced by a motor which drives said crusher, and in which said resistance is determined by the ratio between the power absorbed by said motor and the speed of rotation of said crusher.
Claim 3
Dependent Claim
52 words
A method according to claim 1, in which the speed of rotation of the crusher is equal to the critical speed of the crusher when said charge is equal to the critical charge, and in which said speed of rotation is zero when said charge is equal to half the critical charge.
Claim 4
Independent Claim
106 words
A method for controlling an autogenous or a semi-autogenous crusher, in which the charge (M) within the crusher is continuously determined from the resistance to rotation experienced by a motor which drives said crusher, and the speed of rotation (V) of said crusher is controlled in accordance with a function which links said speed of rotation (V) to said charge (M) and which has the form: V=a.M+b, wherein a and b are constants respectively depending on the crusher structure and the crushing method, wherein said resistance is determined by the ratio between the power utilized by said motor and the speed of rotation of said crusher.
Claim 5
Independent Claim
106 words
A method for controlling an autogenous or a semi-autogenous crusher, in which the charge (M) within the crusher is continuously determined from the resistance to rotation experienced by a motor which drives said crusher, and the speed of rotation (V) of said crusher is controlled in accordance with a function which links said speed of rotation (V) to said charge (M) and which has the form: V=a.M+b, wherein a and b are constants respectively depending on the crusher structure and the crushing method, wherein said resistance is determined by the ratio between the power utilized by said motor and the speed of rotation of said crusher.
Claim 6
Dependent Claim
52 words
A method according to claim 3, in which the speed of rotation of the crusher is equal to the critical speed of the crusher when said charge is equal to the critical charge, and in which said speed of rotation is zero when said charge is equal to half the critical charge.
Claim 7
Independent Claim
130 words
An apparatus for an autogenous or a semi-autogenous crusher comprising means for providing an electric signal proportional to the charge within the crusher; means for converting this input signal into an output signal derived from said input signal in accordance with a function which links the speed of rotation of said crusher to said charge; and means for controlling said speed of rotation of said crusher in proportion to the value of said output signal, in which said means for providing an input signal comprise a device for measuring the power absorbed by driving means for the crusher, a device for measuring the speed of rotation of the crusher, and means for producing a signal which is proportional to said power absorbed and inversely proportional to said speed of rotation.
Claim 8
Independent Claim
130 words
An apparatus for an autogenous or a semi-autogenous crusher comprising means for providing an electric signal proportional to the charge within the crusher; means for converting this input signal into an output signal derived from said input signal in accordance with a function which links the speed of rotation of said crusher to said charge; and means for controlling said speed of rotation of said crusher in proportion to the value of said output signal, in which said means for providing an input signal comprise a device for measuring the power absorbed by driving means for the crusher, a device for measuring the speed of rotation of the crusher, and means for producing a signal which is proportional to said power absorbed and inversely proportional to said speed of rotation.
Claim 9
Independent Claim
156 words
An apparatus for an autogenous or a semi-autogenous crusher comprising means for providing an electrical input signal proportional to the quantity of charge within the crusher; means for converting the input signal into an output signal derived from said input signal in accordance with a function relating the speed of rotation of the crusher to the quantity of charge in the crusher; means for controlling the speed of rotation of said crusher in proportion to the value of said output signal; and at least one safety system to prevent said quantity of charge from exceeding the critical charge of the crusher, in which said means for providing an input signal comprise a device for measuring the power absorbed by driving means for the crusher, a device for measuring the speed of rotation of the crusher, and means for producing a signal which is proportional to said power absorbed and inversely proportional to said speed of rotation.
Claim 10
Independent Claim
156 words
An apparatus for an autogenous or a semi-autogenous crusher comprising means for providing an electrical input signal proportional to the quantity of charge within the crusher; means for converting the input signal into an output signal derived from said input signal in accordance with a function relating the speed of rotation of the crusher to the quantity of charge in the crusher; means for controlling the speed of rotation of said crusher in proportion to the value of said output signal; and at least one safety system to prevent said quantity of charge from exceeding the critical charge of the crusher, in which said means for providing an input signal comprise a device for measuring the power absorbed by driving means for the crusher, a device for measuring the speed of rotation of the crusher, and means for producing a signal which is proportional to said power absorbed and inversely proportional to said speed of rotation.
Claim 11
Dependent Claim
46 words
An apparatus according to claim 6, in which said safety system comprises means for comparing said quantity of charge with the critical charge of the crusher, and triggering means to operate when said quantity of charge becomes equal to a predetermined proportion of said critical charge.
Claim 12
Dependent Claim
33 words
An apparatus according to claim 7, in which said safety system further comprises means for acting on the rate of flow at the intake of the crusher upon operation of said triggering means.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |