WO2019121005A1 - Crible mécanique fin et procédé servant à faire fonctionner un crible mécanique fin - Google Patents

Crible mécanique fin et procédé servant à faire fonctionner un crible mécanique fin Download PDF

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Publication number
WO2019121005A1
WO2019121005A1 PCT/EP2018/083602 EP2018083602W WO2019121005A1 WO 2019121005 A1 WO2019121005 A1 WO 2019121005A1 EP 2018083602 W EP2018083602 W EP 2018083602W WO 2019121005 A1 WO2019121005 A1 WO 2019121005A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
screening machine
ultrasonic vibration
fine screening
siebbelag
Prior art date
Application number
PCT/EP2018/083602
Other languages
German (de)
English (en)
Inventor
Klaus Fennenkötter
Fabian Rölver
Michael Stichling
Original Assignee
Haver & Boecker Ohg
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Haver & Boecker Ohg filed Critical Haver & Boecker Ohg
Priority to EP18814886.0A priority Critical patent/EP3727709A1/fr
Publication of WO2019121005A1 publication Critical patent/WO2019121005A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/42—Drive mechanisms, regulating or controlling devices, or balancing devices, specially adapted for screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/34—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro perpendicularly or approximately perpendiculary to the plane of the screen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/08—Cleaning arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B2230/00—Specific aspects relating to the whole B07B subclass
    • B07B2230/04—The screen or the screened materials being subjected to ultrasonic vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
    • B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
    • B08B7/026—Using sound waves
    • B08B7/028—Using ultrasounds

Definitions

  • the invention relates to a Feinsiebmaschine with at least one screen deck for receiving at least one Siebbelags and at least one ultrasonic vibrator for generating vibrations that are transferred to the screen covering.
  • the invention further relates to a method for operating such a fine screening machine.
  • Fine screening machines are used for separating or classifying screenings with grain sizes in the range of a few tens of micrometers to a few millimeters.
  • Screen decks are usually static festste starting in such Feinsiebmaschinen.
  • Used screen coverings are defined at least at two of their edges within the screen deck, for example by being braced in at least one direction Rich within the screen deck by means of a clamping device.
  • Below the screen coverings are usually two or more Schwingungsanre ger, also called vibrator, arranged, for example, have arranged on a vibrating drive beam transverse Erregerleis th.
  • the exciter bars can be excited in different ways to vibrate.
  • the document WO 2013/152765 A1 describes a screening machine of the type mentioned in the introduction, in which an ultrasonic vibration generator is coupled to the screen lining in order to excite it at a high frequency between 30 and 38 kHz (kilohertz) to oscillate.
  • excitation with ultrasound is advantageously described in addition to excitation at lower frequencies in the range of 100 Hz (Hertz).
  • the ultra Sound stimulation enhances a self-cleaning effect of the screen covering and reduces adhesion of the screenings to the screen surface.
  • a fine screening machine of the type mentioned above which is also suitable for screening of larger material throughputs to create, in which a screening is done effectively with an ultrasonic excitation of Siebbelags. It is a further object to provide an operating method for such a fine screening machine.
  • the larger first amplitude of the ultrasonic vibrator leads to a jumping movement of the individual grains of the screenings through which the screenings can be moved laterally on the one hand (eg due to a tendency of Siebbelags) and on the other in a high Fre quenz on the screen cover incident.
  • the grains of the screenings have accordingly often the opportunity to pass through a mesh of Siebbelags.
  • the high frequency of ultrasonic vibration generation in the range of several to several tens of kilohertz leads to an effective screening process.
  • a layer or cloud in particular a fine fraction of the material to be screened, can be permanently located above the screen lining due to internal shocks during the operation of the ultrasonic oscillator having the large first amplitude.
  • Part of the grains of the screenings thus floats permanently or at least for times that are long compared to a mean residence time of the grains on the screen lining. Accordingly, these grains rarely come in contact with the screen lining and can not pass through it, even if they would have due to their grain size.
  • the regular operation according to the invention of the at least one ultrasound oscillator having the smaller second amplitude causes the cloud of these grains to settle and, correspondingly, to screen these grains as well.
  • the regular lowering of the amplitude of the ultrasonic excitation thus leads to an even more effective screening process and a higher material passage through the screen lining.
  • the second smaller oscillation amplitude can also be zero.
  • the at least one ultrasonic vibration generator is thus switched back and forth between an active operating phase (first operating mode) and a resting phase (second operating mode).
  • the first and the second operating mode change regularly. More preferably, the at least one ultrasonic vibration exciter is operated for a first time period in the first loading operating mode, which is shorter than a mean residence time of non-sieved Siebgutteilchen on the screen covering. In this way, it is sufficient Siebgutteilchen experienced during their average length of stay on the Siebbelag also the second mode of operation, in which the settling is supported on the Siebbelag.
  • a suitable value for the first period of time depends on various parameters of the screening process, i.a. the properties of the screenings (density, size distribution, etc.). However, it has been shown that in typical fine-mesh processes, a first time duration between 0.1 s (seconds) and 10 s and in particular between 0.5 s and 3 s is advantageous.
  • a suitable value for the second time period is advantageously chosen to be at least so large that a large part of the "floating" grains of the screenings material can settle. On the other hand, a too long selected second time decreases the material throughput.
  • the optimum value of the second time period is dependent on the parameters of the screening process, with advantageous times between 0.01 s and 5 s and in particular between 0.05 s and 1 s.
  • a fine screening machine according to the invention with at least one screening deck for receiving at least one screen covering and at least one ultrasonic vibration exciter is characterized in that it is set up to carry out such a method. This results in the advantages mentioned in connection with the method.
  • the Feinsiebmaschine are for vibra tion excitation for each Siebbelag two ultrasonic vibration exciter before seen, the spaced apart in the longitudinal direction from each other act on the respective Siebbelag.
  • a transmission of the vibration of the ultrasonic vibration exciter takes place indirectly, for example via a vibration transformer in the form of, for example, a frame with a rectangular basic shape.
  • the screen lining is then tensioned by an externally arranged clamping device and thereby pressed onto the vibration transmitter.
  • a transfer can take place on a screen lining, which is not firmly connected to a frame, which simplifies the logistics and storage of the screen coverings.
  • the change time is significantly reduced because the vibration transformer does not have to be glued to the screen lining.
  • the at least one screen covering has an inclination of at least 20 ° (degrees) and preferably at least 30 ° with respect to a horizontal.
  • a Siebbelag is used with a substantially square mesh geometry ver.
  • a fine screening machine can be constructed as a single or multi-deck screening machine.
  • sieve units arranged one behind the other can be present, each of which comprises a sieve bed with at least one ultrasonic vibration exciter.
  • at least two of the screen coverings of a screen deck can be inclined to different degrees in order, on the one hand, to achieve the best possible material transport and, on the other hand, the best possible separation of the various fractions.
  • Fig. 1 is a schematic isometric view of a multi-deck fine screening machine
  • Fig. 2 is a schematic isometric view of a single-deck fining machine
  • FIG. 3 shows a schematic longitudinal section through a screen lining with ultrasonic vibrators.
  • Fig. 1 shows a fine screening machine 1 in an isometric schematic representation in a first embodiment.
  • the same reference numerals in this as in all subsequent figures identify the same or equivalent elements.
  • the fine screening machine 1 comprises in the illustrated embodiment, three superimposed screen decks 10.
  • the number of three screen decks 10 is exemplary. In alternative embodiments of the fine screening machine 1, the Number of screening decks 10 also be less than or greater than three.
  • an operating method in accordance with the invention can also be used in a single-deck flattening machine (see FIG. 2).
  • the screen decks 10 are inclined with respect to a horizontal orientation, arranged here by way of example at an angle of about 45 degrees. It is an inlet chute 2 to the task of screenings on the top screen deck 10 is provided. A release of the screened or classified Siebguts via delivery shafts 3 to the side or down.
  • the upper screen deck 10 is covered by a cover 4 to minimize the ingress of contaminants into the screenings.
  • the fine screening machine 1 is mounted on the lower screen deck mounting feet 5 on a frame, not shown here.
  • Fig. 2 is reproduced as a further example of a Feinsiebmaschine 1 Eindeck- Feinsiebmaschine. In its basic structure corresponds to in Fig.
  • the screening deck 10 has side parts 11, between which three screening units 20 are used by way of example.
  • the screening units 20 are arranged in the longitudinal direction of the screen deck 10 hinerei nander, so that a Siebgutstrom from the inlet chute 2 com mend the screening units 20 successively in Fig. 2 from top right to bottom left through.
  • the inclination of the screening units 20 varies, wherein the first in the direction of the screenings Siebiata 20 has a steeper orientation than the second and this in turn has a steeper orientation than the third screening unit 20.
  • the screening units 20 each have a same structure. It is noted that the number of three screen units 20 in the screen deck 10 here is purely exemplary. An in accordance with the operation method can be implemented even with a single screen unit with a screen covering.
  • the cover 4 which covers the screen deck 10 upwards, in several parts, so that each screen unit 20 with a eige cover NEN 4 can be covered.
  • the covers 4 is shown in the Example, only the first screen unit 20 assigned mounted. In the other two screening units 20, the cover 4 is removed in order to represent the structure of the screening units 20 can.
  • Each of the screening units 20 has a screen covering 21 which extends over the entire surface over the screen unit 20. This is shown in FIG. 2 only for the lower of the screening units 20. In the middle of the screening units 20, the screen covering 21 is omitted in order to be able to depict the components arranged below the screen lining 21.
  • Vorlie ing two excitation transformer 22 for each Siebbelag 21, which in this exemplary embodiment are designed as a frame with a rectangular basic shape. Corners of the frame are preferably rounded.
  • Each of the excitation transformers 22 is coupled to an ultrasonic vibrator 23. From this generated vibrations in the ultrasonic range between a few and a few tens of kilohertz are transmitted to the excitation transformer 22 and from there to the Siebbelag 21.
  • the selected number of two excitation transmitters 22 and correspondingly two ultrasonic vibrators 23 per screen covering 21 can be varied in alternative designs of the fine screening machine. Any number of ultrasonic vibrators 23 per excitation transformer 22 is possible. It can be one or more excitation transformer 22 per Siebbe lay 21 are used.
  • the number of selected excitation transformer 22 and ultrasonic vibrators 23 is dependent on the total be required sound power transmitted to the screen covering and the screenings who should, as well as the size of Siebbelags 21. Furthermore, a pos as homogeneous distribution of sound energies should the surface of Siebbelags 21 take place. Areas with too little sound excitation can lead to unwanted material accumulation.
  • Each screening unit 20 also has a receiving and tensioning device, with which the screen lining 21 is fastened and tensioned within the screening unit 20. This receiving and tensioning device is not marked separately in FIG.
  • FIG. 3 shows a longitudinal section through the screen lining 21 of a screening unit 20.
  • the screen lining 21 is located between an ner receiving strip 24, with which it is connected to the fluid, and a clamping conductor 25, in which it is hooked, is stretched in the longitudinal direction.
  • Recording strip 24 and clamping bar 25 are part of the aforementioned receiving and tensioning device.
  • a screen lining 21 is used with anmon ended recording bar 24 in the fine screening machine 1.
  • the screen lining 21 is not mounted on a separate frame, but maintains its shape and stability through the tensioning process.
  • treatment strips that easily overlap the screen cover 21 in the edge area to prevent screenings laterally next to the screen cover 21 can go down through the screen level.
  • Said sealing strip can be in two parts and also clamp the screen lining in sections or over its entire length.
  • Each exciter transformer 22 is coupled to an ultrasonic vibrator 23.
  • the ultrasonic vibrator 23 may be a piezoelectric transducer or an electromagnetically operating transducer.
  • Each of the ultrasonic vibrator 23 is connected to a Ultraschallgenera tor 31, which provides the necessary for operating the ultrasonic vibrator 23 electrical signal.
  • a Ultraschallgenera tor 31 which provides the necessary for operating the ultrasonic vibrator 23 electrical signal.
  • the at least one ultrasonic vibrator 23 is not operated continuously, but pulsed.
  • a generator 31 superordinate control device 30 which outputs a corresponding pulse signal for pulsed operation of the generators 31.
  • the Steuereinrich device 30 may be formed as shown externally or internally in the Ultraschallgenerato Ren 31.
  • the ultrasonic vibrator 23 are ben for a certain first period of time, which may be in the range of a few tenths of seconds to a few seconds Be. This is followed by a pause for a second period of time, which may be in the range of a few hundredths of a second to a few seconds.
  • the second time period is also referred to below as the pause time.
  • the operating modes - active operation and pause - alternate regularly and repeatedly.
  • the active operation of the ultrasonic vibrator 23 leads to a vibrational and / or hopping movement of the individual grains of the material to be screened by the Siebgut moves on the one hand laterally and on the other impinges at a high frequency on the Siebbelag 21 and correspondingly often has the opportunity to pass through a mesh of Siebbelags 21.
  • the high fre quency of vibration excitation leads to an effective screening process.
  • the regular interruption of the active operation of the ultrasonic vibrator 23 according to the invention causes the cloud of these grains to settle and, correspondingly, to screen these particles as well.
  • the regular shutdown (or even operation with low rer amplitude) of the ultrasonic vibrator 23 thus leads to a even more effective screening process and a higher material passage through the screen lining 21st
  • the turn-on and turn-off of the ultrasonic vibrator 23 should be selected depending on the screenings and also depending on the particle size distribution in the screenings so that within the times that Siebgut moves on average in the range of Siebbelags 21, at least one but preferably several break times from Siebgut be experienced.
  • the pause time itself should be chosen so long that the material is allowed to settle due to poor strength. In practical operation, both on and off times in the range of a few 100 ms to a few seconds have been found to be particularly advantageous.
  • the increased screening throughput by the method according to the application allows advantageous even with Feinsiebmaschinen to use the Siebbeläge 21 at a relatively high inclination of 10, ° 20 ° or more and allows the United use of Siebbelägen 21 with a square mesh geometry.
  • linings with long stitches have hitherto been used in particular in fine screening machines with strongly inclined screen coverings.
  • the dimension of the stitches in the longitudinal direction is greater than in the transverse direction.
  • these screen coverings are compared to the screen coverings with square Ma rule dimensions comparatively expensive and have a lower stand time.

Abstract

L'invention concerne un procédé servant à faire fonctionner un crible mécanique fin (1) comprenant au moins une table de criblage (10) servant à recevoir au moins une garniture de criblage (21) et au moins un générateur de vibrations ultrasonores (23) servant à produire des vibrations ultrasonores qui sont transmises sur la garniture de criblage (21). Le procédé est caractérisé en ce que le ou les générateurs de vibrations ultrasonores (23) fonctionnent avec des impulsions. Le générateur de vibrations ultrasonores (23) passe de manière répétée entre un premier mode de fonctionnement présentant une première amplitude de vibration et un deuxième mode de fonctionnement présentant une deuxième amplitude de vibration inférieure par rapport à la première. L'invention concerne par ailleurs un crible mécanique fin (1) comprenant au moins une table de criblage (10) servant à recevoir au moins une garniture de criblage (21) et au moins un générateur de vibrations ultrasonores (23) qui est mis au point pour mettre en œuvre un procédé de ce type.
PCT/EP2018/083602 2017-12-19 2018-12-05 Crible mécanique fin et procédé servant à faire fonctionner un crible mécanique fin WO2019121005A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP18814886.0A EP3727709A1 (fr) 2017-12-19 2018-12-05 Crible mécanique fin et procédé servant à faire fonctionner un crible mécanique fin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017130595.5 2017-12-19
DE102017130595.5A DE102017130595A1 (de) 2017-12-19 2017-12-19 Feinsiebmaschine und Verfahren zum Betreiben einer Feinsiebmaschine

Publications (1)

Publication Number Publication Date
WO2019121005A1 true WO2019121005A1 (fr) 2019-06-27

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PCT/EP2018/083602 WO2019121005A1 (fr) 2017-12-19 2018-12-05 Crible mécanique fin et procédé servant à faire fonctionner un crible mécanique fin

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EP (1) EP3727709A1 (fr)
DE (1) DE102017130595A1 (fr)
WO (1) WO2019121005A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994026427A1 (fr) * 1993-05-10 1994-11-24 Svedala-Arbrå Ab Tamis vibrant
US5386169A (en) * 1991-01-17 1995-01-31 Dubruque; Dominique Device for causing an untuned structure to vibrate ultrasonically
US5799799A (en) * 1996-05-06 1998-09-01 Kason Corporation Ultrasonic screening system
DE20008762U1 (de) 2000-05-16 2000-07-13 Rheinische Werkzeug & Maschf Siebmaschine mit Unwuchtmotoren
US20020117940A1 (en) * 2001-02-23 2002-08-29 Quality Research, Development & Consulting, Inc. Smart screening machine
WO2013152765A1 (fr) 2012-04-11 2013-10-17 assonic Mechatronics GmbH Système de tamisage

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1406269A (en) * 1972-11-14 1975-09-17 Longthorn B Sieving of materials

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386169A (en) * 1991-01-17 1995-01-31 Dubruque; Dominique Device for causing an untuned structure to vibrate ultrasonically
WO1994026427A1 (fr) * 1993-05-10 1994-11-24 Svedala-Arbrå Ab Tamis vibrant
US5799799A (en) * 1996-05-06 1998-09-01 Kason Corporation Ultrasonic screening system
DE20008762U1 (de) 2000-05-16 2000-07-13 Rheinische Werkzeug & Maschf Siebmaschine mit Unwuchtmotoren
US20020117940A1 (en) * 2001-02-23 2002-08-29 Quality Research, Development & Consulting, Inc. Smart screening machine
WO2013152765A1 (fr) 2012-04-11 2013-10-17 assonic Mechatronics GmbH Système de tamisage

Also Published As

Publication number Publication date
EP3727709A1 (fr) 2020-10-28
DE102017130595A1 (de) 2019-06-19

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