Method for monitoring the state of a device and device
AssigneePutzmeister Engineering GmbH
InventorsCarl Wiesenack, Benjamin Hoelzle, Michael Schaefer, Wolf-Michael Petzold, Jan-Martin Veit, Wilhelm F. Hofmann
Life of this patent
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Abstract
A method monitors the state of a device having a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder. The method determines a speed of the first drive piston, establishes a difference between the determined speed of the first drive piston and an expected speed of the first drive piston, and determines a faulty state as a function of the difference established between the determined speed of the first drive piston and the expected speed of the first drive piston.
Claims9
A method for monitoring a state of a device equipped with a first drive cylinder for receiving hydraulic fluid and a first drive piston which is movably arranged in the first drive cylinder,
- the method comprising:
- determining a speed of the first drive piston;
- calculating a difference between the determined speed of the first drive piston and an expected speed of the first drive piston;
- and
- identifying a fault state according to the calculated difference between the determined speed of the first drive piston and the expected speed of the first drive piston,
- wherein the device delivers thick matter and is further equipped with:
- a first delivery cylinder for receiving and releasing thick matter, a first delivery piston, which is movably arranged in the first delivery cylinder, and a first piston rod, which is fastened to the first drive piston and to the first delivery piston for coupled movement of the first drive piston and the first delivery piston,
- a piston seal, which, in the non-defective state, seals off a drive-pump-side volume in the first drive cylinder with respect to a swing volume in the first drive cylinder in conjunction with the first drive piston, and
- a rod seal, which seals off the first drive cylinder with respect to an environment in conjunction with the first piston rod,
- the method further comprising:
- identifying the fault state in the form of a defect in the piston seal and/or in the form of a defect in the rod seal according to the calculated difference between the determined speed of the first drive piston and the expected speed of the first drive piston.
A device that delivers thick matter, comprising:
- a first drive cylinder for receiving hydraulic fluid;
- a first drive piston which is movably arranged in the first drive cylinder;
- a first delivery cylinder for receiving and releasing the thick matter, a first delivery piston, which is movably arranged in the first delivery cylinder, and a first piston rod, which is fastened to the first drive piston and to the first delivery piston for coupled movement of the first drive piston and the first delivery piston;
- a piston seal, which, in a non-defective state, seals off a drive-pump-side volume in the first drive cylinder with respect to a swing volume in the first drive cylinder in conjunction with the first drive piston;
- and
- a rod seal, which seals off the first drive cylinder with respect to an environment in conjunction with the first piston rod;
- and
- a control unit operatively configured to:
- determine a speed of the first drive piston;
- calculate a difference between the determined speed of the first drive piston and an expected speed of the first drive piston;
- identify a fault state according to the calculated difference between the determined speed of the first drive piston and the expected speed of the first drive piston, wherein
- the fault state is identified in the form of a defect in the piston seal and/or in the form of a defect in the rod seal according to the calculated difference between the determined speed of the first drive piston and the expected speed of the first drive piston.
Dependencies are inferred from the claim text.