WO2018060043A1 - Verfahren und vorrichtung zum überwachen eines zustands einer kolbendichtung - Google Patents
Verfahren und vorrichtung zum überwachen eines zustands einer kolbendichtung Download PDFInfo
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- WO2018060043A1 WO2018060043A1 PCT/EP2017/073885 EP2017073885W WO2018060043A1 WO 2018060043 A1 WO2018060043 A1 WO 2018060043A1 EP 2017073885 W EP2017073885 W EP 2017073885W WO 2018060043 A1 WO2018060043 A1 WO 2018060043A1
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- WIPO (PCT)
- Prior art keywords
- cylinder
- signal
- vibration
- piston seal
- piston
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4454—Signal recognition, e.g. specific values or portions, signal events, signatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/48—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by amplitude comparison
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/012—Phase angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0235—Plastics; polymers; soft materials, e.g. rubber
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0423—Surface waves, e.g. Rayleigh waves, Love waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0427—Flexural waves, plate waves, e.g. Lamb waves, tuning fork, cantilever
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/048—Transmission, i.e. analysed material between transmitter and receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/101—Number of transducers one transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/106—Number of transducers one or more transducer arrays
Definitions
- the invention is based on a device or a method according to the preamble of the independent claims.
- the subject of the present invention is also a computer program.
- a piston seal of a cylinder, in particular a working cylinder is difficult to access due to their position between a wall of the cylinder and the piston of the cylinder.
- Piston seal is an expansion of the piston required.
- a piston seal contacts a wall inner surface of a cylinder. Due to the contact are vibration properties of the inner wall surface at one Contact surface between the piston seal and the inner wall surface changed.
- a position of a piston in a cylinder can be detected by using a vibration coupled into the cylinder and the reflection of the vibration at the contact surface.
- a change in the vibration characteristics depends on a condition of the piston seal.
- a method for monitoring a condition of a piston seal of a cylinder comprising the steps of:
- Pressure chamber to be understood with a linearly movable piston.
- the pressure chamber is closed at least on one side by a cylinder bottom.
- Pressure chamber has ports for introducing and discharging a fluid.
- the piston has a piston seal for sealing a gap between a wall inner surface of the cylinder wall and the piston.
- the piston seal may be a ring made of an elastic material.
- the ring is usually arranged in an annular manner around the piston circumferential groove.
- the piston seal can also be referred to as a cylinder seal.
- the material of the piston seal is subject to aging. For example, the material may become brittle, worn or cracked. Due to aging, contact with the wall inner surface changes. This will change too Reflection properties of the contact surface to the piston seal. In other words, aging changes a sound of reflection.
- the state may relate, for example, to a material condition, material property or material form of at least one section or element of the cylinder.
- the method may include a step of observing observing a time history of the state value to detect a change in state.
- the material ages slowly. By observing for a longer period of time, the change and thus the aging can be detected.
- a slope of the gradient can be observed to detect the change. If the state value changes abruptly, it is likely that the state of the piston seal will also change rapidly
- a frequency spectrum of the vibration signal can with a
- Frequency ranges of the vibration signal are no longer reflected and / or transmitted. This change can be detected by a spectral analysis of the reflection signal and / or the transmission signal.
- a transmission power of the vibration signal may be provided with a reception power of the reflection signal and / or a reception power of the
- the method may include a step of outputting in which
- Warning signal is output when the state value leaves a tolerance range. By a warning signal, the cylinder can be serviced before the Piston seal fails. Likewise, the maintenance can be postponed if the piston seal is still good.
- Reflection signal and / or the transmission signal can be compensated to perform the comparison.
- a signal delay is unimportant for monitoring the condition.
- an in-phase comparison an accurate result can be achieved.
- the method may include a step of injecting the oscillation signal into the cylinder and a step of decoupling the reflection signal and / or the transmission signal from the cylinder.
- a vibration generator and for signal extraction at least one vibration sensor can be used.
- at least one vibration generator may also be referred to as
- Vibration sensors are used.
- This method can be implemented, for example, in software or hardware or in a mixed form of software and hardware, for example in a control unit.
- the approach presented here also provides a device which is designed to implement the steps of a variant of a method presented here
- the device may comprise at least one computing unit for processing signals or data, at least one memory unit for storing signals or data, at least one interface to a sensor or an actuator for reading sensor signals from the sensor or for outputting data or control signals to the sensor Actuator and / or at least one
- the arithmetic unit can For example, be a signal processor, a microcontroller or the like, wherein the memory unit may be a flash memory, an EEPROM or a magnetic storage unit.
- the communication interface can be designed to read or output data wirelessly and / or by line, wherein a communication interface that can read or output line-bound data, for example, electrically or optically read this data from a corresponding data transmission line or output to a corresponding data transmission line.
- a device can be understood as meaning an electrical device which processes sensor signals and outputs control and / or data signals in dependence thereon.
- the device may have an interface, which may be formed in hardware and / or software.
- the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the device.
- the interfaces are their own integrated circuits or at least partially consist of discrete components.
- the interfaces may be software modules that are present, for example, on a microcontroller in addition to other software modules.
- a cylinder is presented with a device according to the approach presented here.
- a computer program product or computer program with program code which can be stored on a machine-readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and for carrying out, implementing and / or controlling the steps of the method according to one of the above
- Fig. 1 is a block diagram of a cylinder with a device for
- FIG. 2 is a flowchart of a method for monitoring a condition of a piston seal of a cylinder according to an embodiment
- FIG. 1 shows a block diagram of a cylinder 100 with a device 102 for monitoring according to an exemplary embodiment.
- the device 102 is configured to monitor a condition of a piston seal 104 of the cylinder 100.
- the cylinder 100 is here a working cylinder 100, in which a linear movement of a piston 106 in an interior of the cylinder 100 is transmitted via a piston rod 108 to the outside.
- the piston seal 104 is an annular contacting seal and seals a first pressure chamber of the cylinder from a second pressure chamber of the cylinder by direct contact with a cylinder inner wall 110 of the cylinder 100 and the piston 108.
- the piston seal 104 has an elastic sealing material.
- the piston rod 108 is movably mounted and sealed in an interior of the final cylinder head 112 of the cylinder.
- a cylinder bottom 114 closes the interior space on the opposite side.
- the cylinder 100 may also be designed as a memory. Then in one of the chambers of the cylinder 100 is arranged a compressible medium and / or a spring which is compressed by the pressure exerted on the piston from the other chamber and / or a tensile or compressive force of the piston rod 108 to store energy. If the compressive force by a in the another chamber introduced medium is applied, the piston rod 108 may be omitted.
- the cylinder 100 is according to an embodiment with
- the vibrators 116 are configured to be an electrical
- the vibration sensors 118 are designed to decouple a mechanical vibration from the cylinder and to map it in an electrical signal 124, 126.
- At least one of the following features are provided. According to an alternative embodiment, at least one of the following features:
- Vibration generator 116 is used, which also serves as a receiver after appropriate control after the vibration generation, so that such an arrangement can dispense with a dedicated receiver 118.
- the coupled mechanical vibration 122 propagates with the
- At least one vibration generator 116 and at least one vibration sensor 118 are arranged on the same side of the piston 106. With this arrangement, the reflection vibration 128 can be disposed on the side of the vibrator 116
- Vibration sensor 118 are mapped in an electrical reflection signal 124.
- At least one vibration generator 116 and at least one vibration sensor 118 are disposed on opposite sides of Plunger 106 is arranged.
- Transmission signal 126 are imaged.
- the vibrator 116 and the vibration sensor 118 may be located far apart from each other. Thereby, the piston 106 can be disposed within a large range of movement between the vibrator 116 and the vibration sensor 118.
- the vibration generators 116 and / or the vibration sensors 118 may be piezoelectric elements 116, 118. Depending on the control, the piezoelectric elements 116, 118 act as oscillation generator 116 or transmitter 116 or as oscillation receiver 118 or receiver 118. The piezoelectric elements 116, 118 are designed in particular to generate and record vibrations 122, 128, 130 in the ultrasonic range.
- the vibration generator 116 and / or the vibration sensor 118 may be arranged on the outside of the cylinder 100 via a respective coupling element.
- the coupling elements may have a wedge shape. Then, the coupling elements on a cylinder 100 side facing a
- the coupling elements on a flat surface for the vibration generator 116 and / or the vibration sensor 118.
- the coupling and decoupling of the oscillations 122, 128, 130 is directed.
- the coupling elements may be glued to the cylinder 100, for example.
- the vibration generators 116 and / or the vibration sensors 118 may also be arranged on the cylinder head 112 and / or on the cylinder bottom 114. Then, the vibrators 116 and / or the
- Vibration sensor 118 may be formed as a radial shear plates.
- the aging and / or damage properties of the seal change Piston seal 104, such as the hardness of the sealing material or a contact surface to the cylinder wall 110.
- the properties affect the impedance jump of the cylinder wall 110. The aging and / or damage is thus in the reflection oscillation 128 and / or
- the device 102 for monitoring the state of the piston seal 104 is connected to the vibration generators 116 and the vibration sensors 118.
- a comparator 132 reads in the oscillation signal 120 and the reflection signal 124 and / or the transmission signal 126.
- Comparator 132 is the vibration signal 120 with the
- Reflection signal 124 and / or the transmission signal 126 compared.
- the vibration signal 120 serves as a reference.
- a determiner 134 determines a state value 136 representing the state of the piston seal 104 using a result 138 of the comparison.
- Transmission frequency spectrum of the transmission signal 126 compared to obtain the result 138.
- Transmission signal 126 compared to obtain the result 138.
- the determination device 134 may output a warning signal 140 if the state value 136 is outside a tolerance range.
- the device 102 has a
- the observer 142 observes a course of the state value 136. The course is observed over a longer period of time. If the state value 136 is faster changes, as an expected course, the warning signal 140 may also be issued.
- the cylinder has a measuring device 144.
- the measuring device 144 is also connected to the vibration generator 116 and the vibration sensor 118.
- Propagation speed have the speed of sound of the cylinder material of the cylinder wall 110, in the measuring device 144 using the vibration signal 120 and the transmission signal 126 a transit time between the oscillator 116 on the one side of the piston 106 and the vibration sensor 118 on the other side of the piston 106 can be determined , Because the distance between the
- Vibration generator 116 and the vibration sensor 118 may be known using the transit time variations of
- Vibration sensor 118 can be determined. Since the speed of sound in the material of the cylinder wall 110 is known and / or can be determined, a position of the piston 106 in the interior of the cylinder 100 can be concluded.
- FIG. 1 shows an exemplary arrangement of the sensors 116, 118 in order to be able to measure and analyze both the transmitted portion 130 and the reflected portion 128 of the ultrasonic waves 122.
- the measurement of the position of the piston 106 in the cylinder 100 may be accomplished using magnetostrictive sensors that operate on the
- Such a sensor may be used with cylinders 100 having a piston rod 108.
- the magnetostrictive sensor can not be used.
- magnetic encoders can be used which count magnetic structures on the piston rod 108. Such encoders can also not be used in piston accumulators without piston rod 108. Using ultrasound sensors, the propagation time of an in
- Hydraulic medium impressed sound wave can be measured.
- sensors are highly dependent on the acoustic properties of the medium.
- the speed of sound changes greatly with temperature.
- a function of the ultrasonic sensors is restricted in the case of an occurrence of air bubbles or cavitation in the medium.
- the piston position in the cylinder 100 can be detected, regardless of whether a piston rod 108 is present or not, and regardless of the medium properties. Furthermore, no dedicated machining of the cylinder 100 is required because the sensors 116, 118 can be installed on the outer cylinder wall 110, on the cylinder head 112, or on the cylinder bottom 114, respectively.
- a plurality of ultrasonic sensors 116, 118 can be used in a so-called “array” structure.
- all sensors 116, 118 can be used at the same time. All the sensors 116, 118 of the array can be driven by waves 120 which are coherent with each other and whose phase shift is controlled to achieve a defined beam direction. This is done by Interference formation of the individual radiated waves 122. This results in constructive interference only in a preferred direction, so that only objects in this preferred direction are detected.
- the array structure is controlled and executed differently.
- the nature of the drive and the geometric design of the array avoid destructive interference that forms in the cylinder wall 110 due to multiple reflections and the type of sound propagation. As a result, the reliability or the range and the signal-to-noise ratio of the method can be increased.
- the position of the piston 106 in the cylinder 100 can by means of
- Disk shafts are guided shafts which are characterized in that they are at the
- the propagation of a plate wave 122, 128, 130 in a cylinder 100 is complex because the generation of sound has only a limited aperture. That is, the shaft 122, 128, 130 formed in the wall 110 does not propagate straight line parallel to the cylinder axis, but spreads on the cylinder wall 110 in different directions. Due to the fact that the cylinder 100 has a closed cross-section, interferences form, which may be constructive or destructive depending on the position or running time of the shaft 122, 128, 130. In particular, when the piston 106 is located in a location of destructive interference, the position can not be detected because the piston seal 104 does not cause reflection 128 since the amplitude of the sound wave 122 is zero at the location.
- a first method to avoid the problem of destructive interference is to limit the range of the sensor 116, 118 to such an extent that no destructive interference occurs in its measuring range. When extending the measuring range, depending on the
- the sound wave 122 has a low amplitude in the environment of destructive interference.
- the sound wave 128 reflected by the piston seal 104 also has a low amplitude, so that the measurement signal 124 is very noisy.
- destructive interference is detrimental to a high signal-to-noise ratio.
- the use of a plurality of ultrasonic sensors 116, 118 is advantageous, forming a so-called array structure.
- the sensors 116, 118 are not along the
- Cylinder axis distributed, but on a cylinder cross-section.
- phase relationship is chosen to avoid destructive interference.
- the determination of this phase relationship is analytically and simulatively complex, so that
- the auxiliary sensors 116, 118 may be driven in not every measurement cycle, but only when needed when the main sensor 116, 118 is only a weak one Measurement signal 124 receives.
- a decision to use the array structure can be made by falling below a threshold by the measurement signal 124 of the main sensor 116, 118.
- the role of the main sensor 116, 118 in the array structure may be variable, and may be adaptively determined. For example, the main sensor 116, 118 may be determined by cyclically sequencing each sensor 116, 118 in the array and selecting the sensor 116, 118 with the strongest measurement signal.
- the array structure can be used for more
- the sensors 116, 118 can be installed slightly offset along the cylinder axis. This does not disturb the proposed method, since an offset along the cylinder axis can be made by adjusting the phase relationship between the sound waves 122 from the individual sensors 116, 118.
- the array structure offers sensor security advantages as the array structure intrinsically provides redundancy.
- the roles of sensors 116, 118 between transmitter 116 and receiver 118 may be changed during operation so that the number of receivers 118 and transmitter 116, respectively, may be adjusted to the strength of the measurement signal 124.
- the array structure may not only have sensors 116, 118 placed on the cylinder wall 110. Also, sensors 116, 118 placed on the cylinder bottom 114 and / or the cylinder head 112 may be used.
- An indirect monitoring of the cylinder seal 104 is alternatively possible via a leak detection.
- a leak detection For the distance measuring system 144 and / or Pressure sensors are used, which can detect a drift of the cylinder position or detect pressure changes in the actually stationary state. Seals 104 can also be integrated directly through
- Electrode arrays are monitored, which allows, over one
- Piston rod 108 is required to connect to the outside.
- the piston position of a hydraulic or pneumatic cylinder 100 can be detected without further processing of the cylinder 100. This is done via mounted on the cylinder 110 ultrasonic transmitter 116 and receiver 118, the surface waves 122 on the cylinder inner wall 110 generate. These waves 122 are reflected at the seal 104 due to an impedance discontinuity and over the term of the position can be determined.
- the state of the cylinder seal 104 is determined by using the same sensor technology 116, 118.
- the surface waves 122 are partially reflected at the seal 104, other portions 130 are transmitted. These portions 128, 130 are dependent on the impedance jump in the transition to the sealing material. The impedance of the material, in turn, depends on the condition of the material.
- Change of state of the seal 104 are made. For example, in the event of major changes, a warning 140 may be given to the system to stop the system and perform an inspection.
- the evaluation can be carried out by measuring the energies in the reflected signal 124 and / or the transmitted signal 126 in comparison to the emitted signal 120. Also, changes in the frequency spectrum of the detected signals 124, 126 may allow conclusions. The evaluation can take place over longer periods, since the change processes are usually slow.
- sensors 116 and receiver 118 may also be arranged so that in operation again and again transmitter 116 and receiver 118 are provided on both sides of the seal 104. With this arrangement, the transmitted portion 130 can also be measured and analyzed. Also the position analysis in the
- Measuring device 144 is thereby improved.
- FIG. 2 shows a flowchart of a method for monitoring a condition of a piston seal of a cylinder according to FIG.
- Embodiment. The method can be used on a device for
- the method comprises a step 200 of performing and a step 202 of determining.
- step 200 of the implementation a comparison is made between an oscillation signal coupled into the cylinder and a reflection signal of the oscillation signal which is decoupled from the cylinder and coupled to the piston seal and / or a transmission signal transmitted from the cylinder and transmitted past the piston seal
- step 202 of the determination a state value representing the state is obtained by using a result of the comparison.
- the method includes a step 204 of launching and a step 206 of ejecting, wherein in step 204 of injecting, a mechanical oscillation excited by the oscillation signal is coupled into the cylinder and in step 206 of FIG.
- Auskoppeins a reflection reflected at the piston seal reflection oscillation in the reflection signal and / or a past the piston seal transmitted transmission oscillation in the transmission signal is coupled out.
- an exemplary embodiment comprises a "and / or" link between a first feature and a second feature, this is to be read such that the
- Embodiment according to an embodiment both the first feature and the second feature and according to another embodiment, either only the first feature or only the second feature.
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- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CN201780060229.6A CN109791127A (zh) | 2016-09-29 | 2017-09-21 | 用来监控活塞密封件的状态的方法和设备 |
EP17777824.8A EP3519806A1 (de) | 2016-09-29 | 2017-09-21 | Verfahren und vorrichtung zum überwachen eines zustands einer kolbendichtung |
BR112019005243A BR112019005243A2 (pt) | 2016-09-29 | 2017-09-21 | processo e dispositivo para monitoramento da condição de uma vedação de pistão |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102016218780.5A DE102016218780A1 (de) | 2016-09-29 | 2016-09-29 | Verfahren und Vorrichtung zum Überwachen eines Zustands einer Kolbendichtung |
DE102016218780.5 | 2016-09-29 |
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WO2018060043A1 true WO2018060043A1 (de) | 2018-04-05 |
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PCT/EP2017/073885 WO2018060043A1 (de) | 2016-09-29 | 2017-09-21 | Verfahren und vorrichtung zum überwachen eines zustands einer kolbendichtung |
Country Status (5)
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EP (1) | EP3519806A1 (de) |
CN (1) | CN109791127A (de) |
BR (1) | BR112019005243A2 (de) |
DE (1) | DE102016218780A1 (de) |
WO (1) | WO2018060043A1 (de) |
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DE102017129445A1 (de) * | 2017-11-10 | 2019-05-16 | Grob-Werke Gmbh & Co. Kg | Verfahren und Vorrichtung zur Bestimmung der Position eines Kolbens eines Hydraulikzylinders einer Werkzeugmaschine |
DE102020113272A1 (de) * | 2020-05-15 | 2021-11-18 | Weber-Hydraulik Gmbh | Schwingungsbasierte Wegmessung für lineare Aktuatoren |
CN111637116B (zh) * | 2020-06-10 | 2022-04-15 | 三一海洋重工有限公司 | 检测装置、液压油缸及油缸内泄检测方法 |
CN114252199B (zh) * | 2021-11-26 | 2024-02-20 | 潍柴动力股份有限公司 | 一种气缸漏气检测方法和相关装置 |
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EP1132730A1 (de) * | 2000-03-07 | 2001-09-12 | Sulzer Markets and Technology AG | Verfahren und Anordnung zur Beurteilung des Reibverhaltens zwischen zwei Gegenlaufpartnern |
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US5265461A (en) * | 1991-03-19 | 1993-11-30 | Exxon Production Research Company | Apparatuses and methods for measuring ultrasonic velocities in materials |
DE50100149D1 (de) * | 2000-03-07 | 2003-05-15 | Sulzer Markets & Technology Ag | Verfahren und Anordnung zur Beurteilung des Reibverhaltens zwischen zwei Gegenlaufpartnern |
NO331105B1 (no) * | 2007-04-30 | 2011-10-10 | Nat Oilwell Norway As | Fremgangsmate for detektering av en funksjonsfeil ved en fluidpavirket komponent i en stempelmaskin |
-
2016
- 2016-09-29 DE DE102016218780.5A patent/DE102016218780A1/de not_active Withdrawn
-
2017
- 2017-09-21 BR BR112019005243A patent/BR112019005243A2/pt not_active IP Right Cessation
- 2017-09-21 EP EP17777824.8A patent/EP3519806A1/de not_active Withdrawn
- 2017-09-21 CN CN201780060229.6A patent/CN109791127A/zh active Pending
- 2017-09-21 WO PCT/EP2017/073885 patent/WO2018060043A1/de unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH04124444A (ja) * | 1990-09-14 | 1992-04-24 | Mitsubishi Heavy Ind Ltd | ピストンリングの摩耗監視方法および装置 |
EP1132730A1 (de) * | 2000-03-07 | 2001-09-12 | Sulzer Markets and Technology AG | Verfahren und Anordnung zur Beurteilung des Reibverhaltens zwischen zwei Gegenlaufpartnern |
DE102006014746A1 (de) * | 2006-03-30 | 2007-10-04 | Mahle International Gmbh | Messverfahren und -system für Bauteile, insbesondere für Kolben von Kolbenmaschinen |
Also Published As
Publication number | Publication date |
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CN109791127A (zh) | 2019-05-21 |
EP3519806A1 (de) | 2019-08-07 |
DE102016218780A1 (de) | 2018-03-29 |
BR112019005243A2 (pt) | 2019-06-04 |
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