EP3507016A1 - Verfahren zum überwachen einer schneckenzentrifuge - Google Patents
Verfahren zum überwachen einer schneckenzentrifugeInfo
- Publication number
- EP3507016A1 EP3507016A1 EP17728875.0A EP17728875A EP3507016A1 EP 3507016 A1 EP3507016 A1 EP 3507016A1 EP 17728875 A EP17728875 A EP 17728875A EP 3507016 A1 EP3507016 A1 EP 3507016A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- drum
- transmission input
- screw centrifuge
- input shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B7/00—Elements of centrifuges
- B04B7/02—Casings; Lids
- B04B7/06—Safety devices ; Regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B1/2016—Driving control or mechanisms; Arrangement of transmission gearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
- B04B13/003—Rotor identification systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B9/00—Drives specially designed for centrifuges; Arrangement or disposition of transmission gearing; Suspending or balancing rotary bowls
- B04B9/10—Control of the drive; Speed regulating
Definitions
- the invention relates to a method for monitoring a screw centrifuge.
- the screw centrifuge to be monitored can be configured, for example, as a solid bowl screw centrifuge or as a screen-shell screw centrifuge.
- EP 0 798 046 A1 discloses a centrifuge drive with two motors - a primary engine and a control motor - and a three-stage transmission. A torque is either introduced into the transmission or tapped from it on three shafts.
- DE 10 2006 028 804 A1 discloses a screw centrifuge with a centrifuge drive with two motors - a primary motor and a control motor - and a three-stage gearbox.
- a total of at least four shafts torques in the first gear stage and the second gear stage can be introduced or tapped off from these two gear stages, more preferably the first and the second gear stage are driven in total at least three waves (and usually driven ), wherein the first motor, on the one hand, feeds a torque into the housing and, on the other hand, two shafts, a torque in the first gear stage.
- the differential speed between the drum and the screw is set by the mechanics of the machine or the control of a control motor.
- Claim 1 realizes a method for monitoring a screw centrifuge, in particular a solid bowl or a screen-shell centrifuge, comprising: a rotatable drum, a rotatable screw disposed in the drum, a main or primary motor at least for driving the drum, a drive motor for driving the screw (this means in the context of this document in particular: influencing the differential speed of the screw relative to the drum), which may be the main or primary motor or a secondary motor, as well as between the motor or the motors and the drum and the worm gear arranged, transmission input shafts for the main motor and the drive motor for the screw, wherein at least on the transmission input shaft for the screw one or more impulses are arranged, each associated with a proximity sensor, comprising the following steps: a) providing the screw centrifuge and processing b) (repeated, continued) determining a current angular velocity and determining a mean angular velocity of the transmission input shaft for the screw via the time, c) (repeated) evaluation of the measurements from
- step b) for example, the measurements of the current angular velocity of a last period, for example the last 10 seconds, are averaged and the mean value is continuously updated in this respect. It also becomes the current angular velocity and then changes in that value are recorded against the mean. Dynamic changes are especially periodic changes.
- a reference time for one revolution is preferably determined in the no-load state and deviations thereof are converted into corresponding angles in the subsequent measurements.
- a method for monitoring a screw centrifuge comprising: a rotatable drum, a rotatable screw disposed in the drum, a primary motor for driving the drum and a secondary rotor for driving the worm gear and a gearbox arranged between the motors and the drum and the worm gear with input shafts for the primary engine and the secondary engine, an elastic element between an output shaft of the secondary engine and the transmission input shaft for the secondary motor, wherein on both sides of the elastic element are arranged on the output shaft of the secondary engine and the transmission input shaft pulse generator, each of which proximity sensors are assigned, comprising the following steps: a) providing the screw centrifuge and processing a product with the screw centrifuge, wherein the product of Feststof b) (repeated) measurement of a relative angular offset between the output shaft and the transmission input shaft on both sides of the elastic element connecting these shafts over time, c) (repeated) evaluation of
- Changes in the angular offset can be determined, i. Changes that are not constant over a predefinable period of time. Dynamic changes are in particular periodic changes.
- the elastic element of the variant of claim 2 is preferably a flexible coupling.
- the elastic element can also be formed by a drive belt when a belt drive between the output shaft and the transmission input shaft is provided for the secondary motor.
- a torque-dependent twist angle of the clutch (or of the belt drive) between the secondary motor and the transmission input shaft on both sides of the elastic element is preferably measured with high-resolution in time and harmonic changes of this angle are detected. Because of these measurements), the stick-slip effect can be detected particularly well early.
- a translation is included as appropriate in the determination.
- the output signals of the proximity sensors are preferably read or recorded by the control device, which forms a measuring system with a suitable software measuring program, at a high sampling frequency, the sampling rate being greater, preferably several times greater than the rotational frequency of the transmission input shaft.
- FIG. 1 shows in a) a schematic side view of a section of a full-length screw centrifuge with its drive and a monitoring device, in c) an enlarged detail from a) and in b) a sectional view of the arrangement from c) along the line AA from c) each for carrying out a first variant of an alternative monitoring method;
- FIG. 2 is a measurement diagram illustrating a measurement performed by the monitoring device;
- FIG. 3, 4 are further diagrams for illustrating the invention.
- FIG. 5 shows a schematic side view of a section of a further solid shell screw centrifuge with its drive and an alternatively configured monitoring device for carrying out an alternative monitoring method.
- 1 a shows a section of a solid bowl centrifuge - hereafter referred to as a screw centrifuge - with a rotatable drum 1 with a rotation axis D, which here is a horizontal axis of rotation D.
- a likewise rotatable screw 2 is arranged in the drum 1.
- the drum is arranged between a drive-side and a drive-side facing drum bearing, of which only the drive-side drum bearing 3 is shown here.
- DE 10 2006 028 804 A1 shows a complete drum and the further drum bearing.
- the worm centrifuge has a centrifuge drive 4 for rotating drum 1 and worm 2.
- the centrifuge drive 4 has for this purpose a primary motor 5 and a secondary motor 6 - also called control motor - on and arranged between the motors 5, 6 and the drum 1 and the screw 2 transmission 7, in which both motors 5, 6 in operation feed in a torque. If there is no secondary engine 6, then the one present is called an engine main engine rather than a primary engine.
- the main or primary engine 5 is coupled by way of example via a belt drive 8 to a first input shaft 9 of the transmission 7 and the control motor 6 via an output shaft 10 and a flexible clutch 12 with a preferably second transmission input shaft 1 1 of the transmission 7
- a control device 13 serves to control the motors 5, 6, to which it is connected wirelessly or via lines 14, 15.
- the design of the transmission 7 and the control device 13 is preferably such that between the rotational speed of the drum 1 and the speed of the screw 2 in operation, a differential speed is adjustable.
- the screw centrifuge In operation, a dependence of the differential speed between the drum 1 and the screw 2 from the slip and the load condition of the screw centrifuge is unavoidable. It occurs under mostly indeterminate operating conditions of the previously discussed in this document stick-slip effect in the promotion of the spun-off solid by the screw 2, associated with strong torque surges.
- the screw centrifuge is provided with a monitoring device or a measuring system. This monitoring device makes it possible to measure a torque-dependent twist angle of an elastic element-here the clutch 12-between the drive shaft 10 of the secondary motor 6 and the transmission input shaft 1 1 in a high-resolution manner and to detect (in particular harmonic) changes in this angle.
- the monitoring device has two or more proximity sensors 18, 19 connected to the control device 13 and these pulse transmitters 1 6, 17 assigned to each one.
- the pulse generator 1 6 is arranged on the output shaft 10 of the secondary motor 6 and configured so that one signal or two or more signals can be sen per revolution.
- 10 pins are arranged or formed on the shaft 10 in two offset by 180 ° to each other points of the shaft.
- the pulse generator 1 6, the proximity sensor 18 is assigned, which is arranged and which is designed such that it rotations of the output shaft 10 here per revolution one pulse of the pulse generator 1 6 or per revolution two or more pulses of the pulse generator 16, 1 6 ' sensed.
- the pulse generator 17 is, however, arranged on the transmission input shaft 1 1 and turn (like the pulse generator 1 6) designed so that each revolution, a signal or two or more signals are sensed.
- the pulse generator 17 is assigned to the proximity sensor 19, which is arranged and which is designed such that it rotations of the transmission input shaft 1 1 per revolution here a pulse of the pulse generator 17 or per revolution two or more pulses of the pulse generator 17, 17th 'sensed.
- the pulse generator 17, 16 are on the two waves 1 0 and 1 1 in a fixed angular relationship, for example, with a phase offset, that is arranged with a corresponding angular offset.
- this angular offset (see FIGS. 1 a to 1 c) is 90 °. Since the pulse generator or initiators 1 6, 17 arranged on both sides of the elastic element - in this case the coupling 12 -, it is possible, the angular offset between watch the transmitters 17, 1 6 record over time.
- the proximity sensors 18, 19 (which are designed, for example, as inductive proximity sensors, Hall sensors or reed contact sensors) are monitored by the control device 13, which forms a measuring system with a suitable software measuring program, with a sufficiently high high sampling rate or sampling frequency , This sampling rate is for example 100 kHz.
- the current angular offset between the pulse generators 16, 17 during operation of the drum 1 and the worm 2 is determined. Without torque loading, the measured angular misalignment coincides with that in a reference measurement taken, for example, at initial assembly of the machine (e.g., 90 ° in Figures 1 and 2).
- the angular offset between the pulse generator 1 6, 17 even several times per revolution of the waves 10, 1 1 can be determined.
- angular offsets are determined with the aid of the proximity sensors 18, 19 and the control device 13 and recorded over a period of time, and then the amplitude spectrum of the sequence is determined via a transformation, for example an FFT (fast Fourier transformation).
- FFT fast Fourier transformation
- FIGS. 3 to 4 illustrate the method according to the invention by way of example measurements.
- FIG. 3 shows angular offsets on the basis of FIG
- Measuring signals of the proximity sensors 18, 19 have been determined in ten seconds.
- the two pulse 1 6, 17 are here about 60 ° offset from each other and provide two pulses per revolution. For each revolution, only two of the possible four angular offsets are evaluated in the example, resulting in 242 measured angular offsets (upper third of FIG. 3) in ten seconds.
- the angle offset is in the example alternately above and below 60 °. This is because in one of the pulse generator 1 6, 17, the two flanks are not opposite 180 °, but this is not important for the evaluation, since this frequency is just no longer detectable.
- the calculated amplitude spectra of the 242 values are shown in the lower area of FIG. 3, with the last 10 seconds being evaluated on the left and only the last 2 seconds on the right. It is conceivable to evaluate only the rising edges of FIG. However, if the pulses are chosen to be longer (e.g., 45 °), it will be advantageous to also evaluate the falling edges, as this doubles the number of measurements and increases the resolution of the measurement accordingly.
- FIG. 4 shows the same signals and evaluations for a state with an artificially generated oscillation of a frequency of 0.5 Hz. This is reflected in FIG Spectra quite clearly down. From the significant amplitude fluctuations of the transformation over time can be on a time-changing
- Adhesive sliding effect between drum 1 and screw 2 close which can be interpreted as an indicator of the stick-slip effect.
- the method described can be used in principle for a variety of decanters with driven or braked transmission input shaft 1 1.
- For drives with an elastic belt drive between the secondary motor 6 and the transmission input shaft it is also conceivable to determine a dynamic angular deviation of the two pulleys from the normal ratio and to determine by an appropriate evaluation the incipient stick-slip effect.
- the main motor 5 is designed to drive the drum 1 and the worm 2. Therefore, two Umschlingungstriebe 8 a, 8 b are provided, which couple the main motor 5 once with the first input shaft 9 of the transmission 7 and once directly with a second transmission input shaft 1 1 of the transmission. 7
- the control device 13 serves to control the motor 5.
- the design of the transmission 7 and the control device 13 is preferably such that between the rotational speed of the drum 1 and the speed of the screw 2 in operation, a differential speed is adjustable.
- the screw centrifuge is provided with a variant of the monitoring device or a measuring system.
- This monitoring device makes it possible to torque-dependent
- Fluctuations in the rotations of the transmission input shaft 1 1 temporally high resolution send to detect and detect (in particular harmonic) changes in this angle.
- the monitoring device has one or more proximity sensors 18 which are connected to the control device 13 and which have respective associated pulse transmitters 16.
- the pulse generator 1 6 is arranged on the transmission input shaft 1 1 and designed so that each revolution, a signal or two or more signals are sensed.
Landscapes
- Centrifugal Separators (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL17728875T PL3507016T3 (pl) | 2016-09-01 | 2017-06-12 | Sposób monitorowania wirówki ślimakowej |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016116391.0A DE102016116391B3 (de) | 2016-09-01 | 2016-09-01 | Verfahren zum Überwachen einer Schneckenzentrifuge |
PCT/EP2017/064255 WO2018041432A1 (de) | 2016-09-01 | 2017-06-12 | Verfahren zum überwachen einer schneckenzentrifuge |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3507016A1 true EP3507016A1 (de) | 2019-07-10 |
EP3507016B1 EP3507016B1 (de) | 2020-04-29 |
Family
ID=59030976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17728875.0A Active EP3507016B1 (de) | 2016-09-01 | 2017-06-12 | Verfahren zum überwachen einer schneckenzentrifuge |
Country Status (6)
Country | Link |
---|---|
US (1) | US10744518B2 (de) |
EP (1) | EP3507016B1 (de) |
DE (1) | DE102016116391B3 (de) |
DK (1) | DK3507016T3 (de) |
PL (1) | PL3507016T3 (de) |
WO (1) | WO2018041432A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016116391B3 (de) * | 2016-09-01 | 2018-02-01 | Gea Mechanical Equipment Gmbh | Verfahren zum Überwachen einer Schneckenzentrifuge |
CN111894816B (zh) * | 2020-08-03 | 2021-07-13 | 远景能源有限公司 | 风力发电机组的螺栓监测系统及方法 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2665377B1 (fr) * | 1990-08-02 | 1993-09-03 | Guinard Centrifugation | Decanteuse centrifuge a recuperation d'energie. |
DE4333526C2 (de) * | 1993-10-01 | 1997-03-27 | Westfalia Separator Ag | Antriebseinrichtung für Schneckenzentrifugen |
US5948271A (en) * | 1995-12-01 | 1999-09-07 | Baker Hughes Incorporated | Method and apparatus for controlling and monitoring continuous feed centrifuge |
FR2746675B1 (fr) | 1996-03-29 | 1998-05-07 | Guinard Centrifugation | Decanteuse centrifuge a module redex |
US6368264B1 (en) * | 1999-03-29 | 2002-04-09 | M-I L.L.C. | Centrifuge control system and method with operation monitoring and pump control |
US6905452B1 (en) * | 2002-04-26 | 2005-06-14 | Derrick Manufacturing Corporation | Apparatus for centrifuging a slurry |
US7387602B1 (en) * | 2002-04-26 | 2008-06-17 | Derrick Corporation | Apparatus for centrifuging a slurry |
DE102006028804A1 (de) | 2006-06-23 | 2007-12-27 | Westfalia Separator Ag | Schneckenzentrifuge mit Antriebsvorrichtung |
GB201014715D0 (en) * | 2010-09-06 | 2010-10-20 | Vib Vzw | Nanobodies stabilizing functional conformational states of GPCRS |
JP5442099B2 (ja) * | 2012-06-05 | 2014-03-12 | 巴工業株式会社 | 遠心分離装置 |
GB2513358A (en) * | 2013-04-24 | 2014-10-29 | Nat Oilwell Varco Lp | A centrifuge and a control system therefor |
US9283572B2 (en) * | 2013-09-09 | 2016-03-15 | Derrick Corporation | Centrifuge with automatic sampling and control and method thereof |
US10639649B2 (en) * | 2014-07-17 | 2020-05-05 | Gea Mechanical Equipment Gmbh | Feedback control method for the operation of a centrifuge |
DE102016116391B3 (de) * | 2016-09-01 | 2018-02-01 | Gea Mechanical Equipment Gmbh | Verfahren zum Überwachen einer Schneckenzentrifuge |
-
2016
- 2016-09-01 DE DE102016116391.0A patent/DE102016116391B3/de not_active Expired - Fee Related
-
2017
- 2017-06-12 PL PL17728875T patent/PL3507016T3/pl unknown
- 2017-06-12 US US16/329,486 patent/US10744518B2/en active Active
- 2017-06-12 WO PCT/EP2017/064255 patent/WO2018041432A1/de unknown
- 2017-06-12 EP EP17728875.0A patent/EP3507016B1/de active Active
- 2017-06-12 DK DK17728875.0T patent/DK3507016T3/da active
Also Published As
Publication number | Publication date |
---|---|
US20190224691A1 (en) | 2019-07-25 |
EP3507016B1 (de) | 2020-04-29 |
DK3507016T3 (da) | 2020-07-20 |
WO2018041432A1 (de) | 2018-03-08 |
US10744518B2 (en) | 2020-08-18 |
DE102016116391B3 (de) | 2018-02-01 |
PL3507016T3 (pl) | 2020-10-19 |
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