Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/04—Devices damping pulsations or vibrations in fluids
  • F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
  • F16L55/05—Buffers therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
  • F15B21/008—Reduction of noise or vibration
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
  • B21B37/58—Roll-force control; Roll-gap control
  • B21B37/62—Roll-force control; Roll-gap control by control of a hydraulic adjusting device
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/60—Circuit components or control therefor
  • F15B2211/63—Electronic controllers
  • F15B2211/6303—Electronic controllers using input signals
  • F15B2211/6306—Electronic controllers using input signals representing a pressure
  • F15B2211/6313—Electronic controllers using input signals representing a pressure the pressure being a load pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B2211/00—Circuits for servomotor systems
  • F15B2211/80—Other types of control related to particular problems or conditions
  • F15B2211/86—Control during or prevention of abnormal conditions
  • F15B2211/8613—Control during or prevention of abnormal conditions the abnormal condition being oscillations
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T137/00—Fluid handling
  • Y10T137/0318—Processes
  • Y10T137/0324—With control of flow by a condition or characteristic of a fluid
  • Y10T137/0379—By fluid pressure

Definitions

• the present invention relates to a method and apparatus for active suppression of pressure oscillations or pressure pulsations in a hydraulic system of a cold or hot rolling mill or a strip processing plant for iron, steel or aluminum materials.
• pressure oscillations can either be induced internally in the hydraulic system, e.g. caused by the non-uniformity of the delivery rate of pumps or by the control of valves, etc., but also externally, e.g. due to periodic load fluctuations in hydraulic cylinders or motors. It is further known that it is especially at
• Hydraulic systems with high dynamics for example, consisting of a steady hydraulic valve (for example, an electrically controlled proportional or servo valve) and a hydraulic cylinder or motor, can cause strong pressure oscillations in the hydraulic system.
• a steady hydraulic valve for example, an electrically controlled proportional or servo valve
• a hydraulic cylinder or motor can cause strong pressure oscillations in the hydraulic system.
• Hydraulic systems high dynamics are used and on the other hand - due to higher demands on the reaction time and economy - the damping in the Hydraulic systems (eg the viscous damping in the seals of cylinders) is reduced.
• From DE 4 302 977 Al is a device for the active suppression of pressure oscillations in one
• Hydraulic unit known, which has a pressure sensor, a control device with associated amplifier and a volume compensator. Concrete regulations for the procedure to be carried out or further indications for an advantageous application of the device in one
• Hydraulic system of a rolling mill or strip processing plant can not be taken from the disclosure.
• the object of the invention is to provide a method and a device for the active suppression of pressure oscillations or pressure pulsations in a hydraulic system of a cold or hot rolling mill or a strip treatment plant, with which occurring pressure oscillations or pulsations can be suppressed particularly effectively by means of a simple and inexpensive device ,
• a pressure signal by means of a pressure transducer (eg with a piezoelectric, piezoresistive or strain gauge (Dehn measuring strip) measuring cell) by permanently measuring a pressure in a hydraulic system of a cold or hot rolling mill or a strip processing plant for iron, steel or aluminum materials detected , Under a pressure transducer (eg with a piezoelectric, piezoresistive or strain gauge (Dehn measuring strip) measuring cell) by permanently measuring a pressure in a hydraulic system of a cold or hot rolling mill or a strip processing plant for iron, steel or aluminum materials detected , Under a
• Hydraulic system refers to a portion (typically a hydraulic circuit or a hydraulic axis) of a hydraulic system, which is hydraulically connected to each other, for example, the area between a hydraulic valve and a hydraulic cylinder incl
• an alternating component is determined from the pressure signal, ie. it is the DC component of the pressure signal removed, and fed to a controller.
• the determination of the alternating component can be carried out either by an electronic filter module or by a digital filter (eg removal of the DC component by means of a viewing window English, "sliding window", consisting of n measured values of the pressure signal (filter order n), of course, however, the removal of the DC component
• the determination of the alternating component can also be carried out by means of a piezoelectric pressure transducer and a charge amplifier which is either connected downstream of the pressure sensor or integrated in the pressure transducer .
• the controller determines taking into account at least one reference value and the alternating component of the pressure signal, at least one temporally variable manipulated variable, which is used to load at least one variable volume actuator, by acting on the manipulated variable, the actuator releases a volume, which communicates with the Ste ll size corresponds.
• the volume of the hydraulic system is changed via the actuator, whereby the with the Pressure oscillation accompanying volumetric flow oscillation at least partially compensated and in consequence the pressure oscillation is suppressed.
• a manipulated variable of zero for example, an average volume, ie.
• a neutral or undeflected position of the actuator correspond;
• a manipulated variable of zero corresponds to a minimum volume;
• a maximum manipulated variable can then, for example, with a max. Volume go along.
• the transfer of the manipulated variable signal from the controller to the actuator can be wired or wireless (eg via radio).
• high-pass filtering By means of high-pass filtering is the targeted decoupling of the suppression of pressure oscillations of optionally existing in the system further control circuits, e.g. a position or force control of a hydraulic cylinder, possible.
• a bandpass filtering allows targeted suppression of certain frequency ranges of the
• Pressure oscillations (which, for example, coincide with a natural frequency of the rolling mill or of a subsystem, or have a high amplitude or intensity);
• adaptive bandpass filters which are e.g. automatically isolate a frequency band with high amplitude - possible.
• the controller uses the setpoint zero when determining the manipulated variable.
• each real actuator has a phase shift in the transmission behavior, it is possible to supply the time-variable manipulated variable to a lead / lag element and thereby specifically change the phase position.
• Hurry e.g. of the
• a further advantageous embodiment of the method is that the time-variable variable is supplied to the actuator after a gain. This makes it possible to separate the signal processing part in the controller from the power unit, which can be high performance on the actuator connect with high control accuracy.
• a further advantageous embodiment is to filter different frequency bands from the alternating component, to supply these frequency bands to at least one controller for determining time-variable manipulated variables, then to feed the manipulated variables to at least one actuator having a volume corresponding to the manipulated variable and communicating with the hydraulic system changed, whereby the pressure oscillations are suppressed in the hydraulic system.
• the device comprises: at least one communicating with the hydraulic system pressure sensor for
• Detecting a pressure signal a member for determining a change portion of the pressure signal to which the pressure signal can be supplied, at least one control device, the Alternating component and a setpoint can be supplied and with the aid of which at least one manipulated variable can be determined and at least one associated with the hydraulic system actuator with variable volume to which the manipulated variable can be supplied.
• Piezoelectric actuators are familiar to the expert; magnetostrictive actuators, e.g. Actuators from the material Terfenol-D ® from Etrema, have excellent dynamic properties and can also be used with advantage.
• an actuator is equipped with a pressure transducer for detecting a pressure signal.
• a pressure transducer is located in an actuator designed as a hollow cylinder.
• the device according to the invention in a hydraulic system of a rolling mill at least consisting of a hydraulic valve, a hydraulic cylinder and a hydraulic line or a hose, integrate when the device with the hydraulic valve and the hydraulic cylinder a
• Roller adjustment of the rolling stand is in communication.
• the installation is particularly compact when the device is installed in an intermediate plate of the hydraulic valve.
• the method according to the invention or the device can be used in cast roll composite systems, in particular in thin strip casting machines, very particularly preferably in two-roll casting machines.
• Casting plants, or in thin slab casters of the type ESP (Endless Strip Production) are used.
• Fig. 1 Scheme of a controlled system for the active suppression of pressure oscillations in a hydraulic system of a
• Fig. 1 shows the basic structure of a controlled system for suppressing pressure oscillations in a hydraulic system of a rolling train.
• a pressure sensor 2 detects a pressure signal 2 in a hydraulic system 10, the pressure signal 2 a high-pass filter 3 (see, for example, P. 35 in P. Horowitz, W. Hill, The Art of Electronics, Cambridge University Press, Second edition, 1989), which determines the alternating component of the pressure signal 2 'and supplies it to a controller 4.
• This controller 4 calculates in real time by means of a control law, taking into account the alternating component 2 'and a desired value 5, a time-variable manipulated variable 6, which is fed to a lead / lag member 7.
• the phase position of the manipulated variable 6 is changed, whereby the phase shift of an actuator 9 is at least partially compensated.
• the phase-shifted manipulated variable signal is amplified by means of an amplifier 8 with respect to the voltage amplitude and current, and then supplied to the actuator 9.
• the actuator 9 is one of the manipulated variable corresponding and connected to the hydraulic system 10 Volume changes, which at least partially compensates for the associated with the pressure oscillations flow oscillations, whereby the pressure oscillations are compensated.
• FIG. 2 is a schematic device for suppressing pressure oscillations in a hydraulic system of a scaffold for rolling iron or steel materials is shown.
• a pressure signal 2 is detected by means of a pressure transducer 1 by permanently measuring a pressure in a hydraulic system 10 for adjusting a roller 14 for rolling a rolling stock 15 made of iron or steel materials, wherein the hydraulic system consists of a hydraulic valve 11, a hydraulic cylinder 12 and a hydraulic line 13 ,
• the pressure transducer 1 can be located either in the section between a piezoelectric actuator 9 'and the hydraulic cylinder 12 (as shown) or in the section between the hydraulic valve 11 and the actuator 9'.
• a plurality of pressure transducers between the piezoelectric actuator 9 'and the hydraulic cylinder 12 or between the hydraulic valve 11 and the actuator 9 are arranged.
• the pressure signal 2 is transmitted to a digital controller 4, which determines a frequency band of the alternating component and calculates, taking into account a desired value 5 and with the aid of a control algorithm, a temporally variable manipulated variable 6.
• the manipulated variable is supplied after amplification in an amplifier, not shown, the piezoelectric actuator 9 ', which corresponds to the manipulated variable 6 and with the hydraulic line 13 in
• Connection standing volume releases, so that the associated with the pressure oscillations volumetric flow oscillations are at least partially compensated, whereby the pressure oscillations are compensated.
• FIGS. 3 and 4 show schematic representations of a magnetostrictive actuator 9 "with an integrated pressure transducer 1.
• the actuator 9 '' as Hollow cylinder is formed, the pressure transducer 1 is in a cavity of the actuator 9 '' integrated, which is sealed relative to a hydraulic system 10 by means of a piston 16, a seal 17 and a housing.
• the pressure transducer 1 is in the actuator 9 '' integrated, whereby the installation of the assembly consisting of pressure transducer 1 and actuator 9 '', is further simplified.
• the actuator 9 is powered by an electrical lead 18; an electrical line 19 supplies the pressure transducer 1 and transmits the measured data to a filter or a regulator with an integrated filter.
• inventive method or device can be used in any hydraulic systems of the mobile or industrial hydraulics.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Control Of Metal Rolling (AREA)
• Fluid-Pressure Circuits (AREA)
• Heat Treatment Of Strip Materials And Filament Materials (AREA)
• Force Measurement Appropriate To Specific Purposes (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2008
  • 2008-12-05 AT AT0189708A patent/AT507088B1/de not_active IP Right Cessation
• 2009
  • 2009-11-30 US US13/132,715 patent/US20120000543A1/en not_active Abandoned
  • 2009-11-30 CN CN2009801486512A patent/CN102256716B/zh not_active Expired - Fee Related
  • 2009-11-30 JP JP2011538974A patent/JP2012510899A/ja active Pending
  • 2009-11-30 RU RU2011127443/02A patent/RU2526647C2/ru not_active IP Right Cessation
  • 2009-11-30 BR BRPI0922297A patent/BRPI0922297A2/pt not_active IP Right Cessation
  • 2009-11-30 CA CA 2745800 patent/CA2745800A1/en not_active Abandoned
  • 2009-11-30 KR KR1020117015554A patent/KR20110097927A/ko not_active IP Right Cessation
  • 2009-11-30 WO PCT/EP2009/066014 patent/WO2010063661A2/de active Application Filing
  • 2009-11-30 EP EP09793492A patent/EP2352603A2/de not_active Withdrawn
  • 2009-11-30 MX MX2011005637A patent/MX2011005637A/es not_active Application Discontinuation

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