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US 4,273,035 AGranted
Method and apparatus for stabilizing operation of a press
OwnerDante S. Cusiinventor
Life of this patent
Estimating the term…
Abstract
A method and apparatus for stabilizing the operation of a dewatering press operating on a known liquid-solid mixture by measuring a physical property such as the pressure of the material being dewatered at an intermediate position in the press, comparing the measured value with a predetermined optimum value set at will by the machine operator, and generating from the comparison a process alteration capable of stabilizing the operation of the press.
Claims40
A method for stabilizing the operation of a press used to separate the phases of a liquid-solid mixture wherein the discharge of liquid expressed from the mixture upstream of a control position downstream from the inlet of the press is restricted by an adjustable valve comprising the steps of
- (a) measuring the pressure of the liquid-solid mixture at the control position,
- (b) comparing the measured value of the pressure at the control position with a predetermined optimum value of the pressure at the control position, and
- (c) generating as a result of the comparison a change in the restriction caused by the adjustable valve which tends to reduce any difference between the measured value and the optimum value.
A method for stabilizing the operation of a variable speed press used to separate the phases of a liquid-solid mixture comprising the steps of
- (a) determining the relationship between the pressure of the mixture at a control position downstream of the inlet of the press and the pressure of the mixture at the outlet of the press,
- (b) deriving from the determination an optimum value of the pressure at the control position,
- (c) measuring the pressure of the mixture at the control position,
- (d) comparing the measured value of the pressure with the predetermined optimum value of the pressure, and
- (e) varying the speed of the press as a result of the comparison so as to reduce any difference between the measured value and the optimum value.
2 more elements
A method for stabilizing the operation of a press used to separate the phases of a liquid-solid mixture comprising the steps of
- (a) measuring the values of
- (1) at least one physical property of the mixture being fed into the press, and
- (2) at least one physical property of some element of the mixture being pressed at a control position downstream from the inlet of the press,
- (b) computing from the measured values, according to a known formula, the value of the consistency of the mixture at the control position,
- (c) comparing the compound value of the consistency at the control position with a predetermined optimum control position value of the consistency, and
- (d) generating as a result of the comparison at least one process alteration tending to reduce any difference between the computed value and the optimum value of the consistency at the control position.
3 more elements
A press comprising:
- an inlet at the upstream end of the press for the introduction to the press of a liquid-solid mixture from which the liquid is to be separated by pressing,
- an outlet for the pressed material at the downstream end of the press,
- a control cross section downstream from the inlet of the press,
- means for conducting away from the press liquid separated from the mixture upstream of the control section,
- adjustable means for restricting the flow of separated liquid through the conducting means,
- means for measuring the value of a physical property of the mixture at the control cross section,
- means associated with the measuring means for comparing the measured value with a predetermined optimum value at the control cross section, and
- means associated with the comparing means for generating as a result of the comparison a control signal capable of reducing any difference between the measured value and the predetermined optimum value.
5 more elements
A press for separating the phases of a liquid-solid mixture comprising:
- an inlet at the upstream end of the press body for the introduction of the mixture to be separated by pressing,
- an outlet for the pressed material at the downstream end of the press body,
- a control cross section downstream from the inlet of the press,
- means for conducting away from the press body liquid separated from the mixture upstream of the control cross section,
- first means for measuring at least one physical property of the mixture being fed to the press,
- second means for measuring at least one physical property of the liquid in the conducting means,
- control means associated with the first and second measuring means for generating as a result of the measurements an indication of the actual consistency of the mixture at the control cross section, for comparing that indication with a predetermined optimum value at the control cross section, and for generating as a result of the comparison a control signal capable of reducing any difference between the actual value of the consistency and the predetermined optimum value.
4 more elements
A press comprising:
- an inlet at the upstream end of the press for the introduction to the press of a liquid-solid mixture from which the liquid is to be separated by pressing;
- an outlet for the pressed material at the downstream end of the press;
- means for conducting away from the press liquid separated from the mixture over at least a portion of the length of the press;
- adjustable means for restricting the flow of separated liquid through the conducting means;
- measuring means located at a preselected point upstream of the outlet for measuring the value of a physical property of the mixture at the preselected point;
- means associated with the measuring means for comparing the measured value with a predetermined optimum value for the preselected point where the measurement is taken;
- and
- means associated with the comparing means for generating as a result of the comparison a control signal capable of reducing any difference between the measured value and the predetermined optimum value.
5 more elements
A press for separating the phases of a liquid-solid mixture comprising:
- an inlet at the upstream end of the press for the introduction of the mixture to be separated by pressing;
- an outlet for the pressed material at the downstream end of the press;
- means for conducting away from the press liquid separated from the mixture over at least a portion of the length of the press;
- first means for measuring at least one physical property of the mixture being fed to the press;
- second means for measuring at least one physical property of the liquid in the conducting means;
- and
- control means associated with the first and second measuring means for generating as a result of the measurements an indication of the actual consistency of the mixture as it passes a position corresponding to the downstream end of that portion of the length of the press associated with the conducting means, for comparing that indication with a predetermined optimum value for this same position, and for generating as a result of the comparison a control signal capable of reducing any difference between the actual value of the consistency and the predetermined optimum value.
4 more elements
Dependencies are inferred from the claim text.