EP3694657A1 - Système de tamisage comprenant des systèmes de vibration disposés aux noeuds de vibration - Google Patents

Système de tamisage comprenant des systèmes de vibration disposés aux noeuds de vibration

Info

Publication number
EP3694657A1
EP3694657A1 EP18779718.8A EP18779718A EP3694657A1 EP 3694657 A1 EP3694657 A1 EP 3694657A1 EP 18779718 A EP18779718 A EP 18779718A EP 3694657 A1 EP3694657 A1 EP 3694657A1
Authority
EP
European Patent Office
Prior art keywords
vibration
screening
side walls
side wall
sieve
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.)
Pending
Application number
EP18779718.8A
Other languages
German (de)
English (en)
Inventor
Guido Leuschen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FLSmidth AS
Original Assignee
ThyssenKrupp AG
ThyssenKrupp Industrial Solutions AG
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 ThyssenKrupp AG, ThyssenKrupp Industrial Solutions AG filed Critical ThyssenKrupp AG
Publication of EP3694657A1 publication Critical patent/EP3694657A1/fr
Pending legal-status Critical Current

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
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
    • B06B1/162—Making use of masses with adjustable amount of eccentricity
    • B06B1/165—Making use of masses with adjustable amount of eccentricity with fluid masses or the like
    • 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
    • B07B1/284—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens with unbalanced weights
    • 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
    • B07B1/36—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro in more than one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B2201/00—Indexing scheme associated with B06B1/0207 for details covered by B06B1/0207 but not provided for in any of its subgroups
    • B06B2201/70—Specific application

Definitions

  • the invention relates to a sieve system for sieving screenings, in particular for sieving mineral rocks, comprising a sieve box comprising two outer side walls, wherein at least two vibration systems for vibrational excitation are arranged on the two side walls and wherein the two side walls each have at least two nodes according to a vibration Bending mode, further comprising at least two trusses that connect the two side walls together, and also having at least one screen deck, which rests on the at least two trusses. Furthermore, the invention relates to a method for screening screenings, in particular for sieving of mineral rock, by means of an aforementioned screening system.
  • a screening system of the type mentioned is for example from the patent
  • the aforementioned screening system has the advantage that any desired oscillation angle can be varied steplessly during operation and a once desired oscillation angle can be maintained without the conveyed material influencing this oscillation angle.
  • the object is achieved in that the respective two vibration systems are arranged on the respective side wall such that each vibration system is arranged in the region of a vibration node of the respective side wall.
  • a freely oscillating body in the present case a side wall, has a plurality of eigenmodes with associated natural frequencies.
  • the first bending mode is also called the basic form.
  • the nodes of vibration represent the positions of the structure which are not deflected by the eigenmode. Higher self-modes with increased frequency can occur, with the natural frequencies being much higher.
  • a eigenmode can only be excited if the excitation frequency is close to the natural frequency and is not initiated in the vibration node.
  • the natural frequencies depend on the stiffness and the mass of the body, or the side wall. A lower stiffness reduces the natural frequency.
  • the height of the sidewalls takes into account the stiffness, whereby it has to be taken into account that a vertical elevation with otherwise the same geometry increases the rigidity and thus also the natural frequency. This is the reason why the conventional way of increasing the stiffness of a sidewall is to increase the vertical height of the respective sidewall.
  • the nodes are also known as Bessel points.
  • the nodes of vibration fall on Bessel points which, with regard to moment, inclination and deflection, represent optimum bearing positions of a uniformly loaded carrier, or in the present case a cross member, at two bearing points.
  • the respective two vibration systems are arranged on the respective side wall such that each vibration system is arranged in the region of a vibration node of the first bending mode of the respective side wall.
  • a eigenmode can only be excited if the excitation frequency is not initiated in the vibration node. It therefore corresponds to the doctrine of the invention, the components of the screen system, in particular the trusses and the side walls, not to have to dimension considerably larger, if directly the formation of the first eigenmode is prevented. Since the vibration systems are thus arranged in the region of the vibration nodes, it follows that the exciting frequency of the vibration systems is not introduced into the side walls in a bending-forming manner.
  • a vibration system is removed from a vibration node of a side wall, the more the excitation frequency of the vibration system intervenes in the side wall forming a bending mode. It is therefore particularly preferred that at least one, preferably each vibration system is arranged directly overlapping the respective vibration node. However, an arrangement of at least one, preferably each vibration system in the region of the vibration nodes is also possible.
  • at least one and “at least one” is meant a numerical minimum number.
  • the formulation range here preferably describes a maximum radius from the center of the vibration node whose magnitude is less than or equal to 20%, preferably less than or equal to 10%, particularly preferably 0%, of the maximum main extension length of the respective sidewall, wherein the magnitude of the range is a maximum radius from the center of the vibration node is in particular antiproportional to the maximum main extension length of the respective side wall.
  • the anti-proportionality it is meant that as the amount of the maximum main extension length of the respective side wall increases, the amount of the maximum radius from the center of the vibration node decreases. In this case, provision is made in particular for the main extension length of the respective side wall to extend along the conveying direction of the screened material.
  • the conveying direction is the direction of movement of the material to be screened along the sieve deck.
  • the sieve box has at least two, preferably three, vertically stacked sieve decks.
  • the sieve box should preferably have at most six sieve decks arranged vertically one above the other. It turned out that a number of more than six Sieve decks in the present screen system in relation to the cost of materials has led to an insufficient screening result.
  • the vertically stacked screening decks are arranged parallel to one another.
  • the side walls are arranged parallel to one another.
  • the side walls are arranged tapering towards one another, that is, tapering towards one another.
  • the two side walls may be arranged mirror-symmetrically to one another to a vertical mirror plane which extends along a conveying direction. Vertical means perpendicular to the horizon.
  • the vibration systems can be particularly well coordinated with each other.
  • the components of the screen system are as evenly as possible and therefore as far as possible gently loaded.
  • each vibration system consists of two or more unbalance drives.
  • each vibration system consists of three or more unbalance drives.
  • each vibration system may consist of four or more unbalance drives. As the number of unbalance drives per vibration system increases, the vibration angle of the screen material can be set more precisely.
  • the oscillation angle is the angle to the sieve deck, which the screenings are thrown by the excitation by means of the vibration systems.
  • each imbalance drive has a sensor unit for determining a real-time angular position of the imbalance mass.
  • the screen has a control system which is connected to the unbalance drives to adjust phase offsets of the unbalance drives.
  • an electronic control of designed as unbalance drives vibration systems More precisely, the synchronization is preferably carried out actively by means of a frequency converter control.
  • the reduced load on the side walls also allows all trusses are the same design. This leads to significantly reduced costs, because the trusses can be produced, transported and assembled with the same system. In addition, it is even possible because of the reduced load that all trusses have a hollow profile. This in turn reduces the weight load on the sidewalls of the trusses.
  • Particularly preferred all trusses can be tubes.
  • the need for different trusses, in particular the need for particularly solid crossbars in the sidewall area with maximum amplitudes of conventional bending modes, is eliminated, since the bending modes can now as far as possible not engage in the sieve system.
  • the invention relates to a method for screening of screenings, in particular for sieving of mineral rock, by means of a screening system according to at least one of the preceding features, wherein the method is characterized by the following method steps: starting the designed as imbalance vibration systems, then setting a swing angle for Screen material via a control system, for which a phase offset of each vibration system is set electronically, as needed adapting the vibration angle for screenings on the control system, for which purpose the phase offset of each vibration system is electronically adjusted.
  • both linear, circular and elliptical shapes of the oscillatory movements of the screen box can be realized.
  • FIG. 1 shows a side view of a screening system according to the state of the art
  • FIG. 2 shows a perspective view of a screening system according to the invention
  • FIG. 3 shows an alternative perspective view of the screening system according to FIG. 2
  • Figure 4 is a perspective top view of the screen system according to Figures 2 and 3
  • Figure 5 is a side view of a side wall of the screening system according to the invention with illustrated vibration node of a first bending mode
  • FIG. 6 shows the vibration nodes of the first bending mode according to FIG. 5 in a simplified representation.
  • Fig. 1 shows a side wall (31 or 32) of a sieve box (2) of a sieve system (1) according to the prior art for sieving of mineral rock in a side view.
  • two vibration systems (4) are arranged for vibrational excitation.
  • the illustrated side wall (31 or 32) also has two oscillation nodes (S) according to a first bending mode.
  • the illustrated side wall (31 or 32) includes trusses (5), wherein upper trusses (5) each have a round profile and a lower crossbar (5) have a quadrangular profile.
  • the different profiles are provided for reasons of stability, with preference being given to more solid trusses (5) for reasons of cost and weight.
  • the trusses (5) connect the two side walls (31, 32) with each other.
  • a screen deck (6) is mounted on the trusses (5). Sifted mineral rock falls vertically down through recesses of the screen deck (6). Mineral rock which is larger than the recesses of the screen deck (6) is moved by the excitation of the vibration systems (4) via the screen deck (6) along a conveying direction (F).
  • FIG. 2, 3 and 4 show an embodiment according to the invention of a sieve system (1) for sieving mineral rock, whereby this sieve system (1) is opposite to the sieve system. 1 (1) according to FIG. 1, in particular in the arrangement of vibration systems (4).
  • the sieve system (1) has a sieve box (2) which comprises two outer side walls (31, 32).
  • the side walls (31, 32) are in particular mirror-symmetrical, so that they do not differ significantly.
  • the side walls (31, 32) are arranged parallel to one another.
  • the two side walls (31, 32) to a vertical mirror plane extending along a conveying direction (F) are arranged mirror-symmetrically to each other.
  • the two side walls (31, 32) each have two nodes of vibration (S) of a first bending mode.
  • the two side walls (31, 32) are connected to one another via a multiplicity of traverses (5).
  • all trusses (5) are the same, namely as tubes with a hollow profile.
  • FIGS. 2, 3 and 4 it can be seen in FIGS. 2, 3 and 4 that a screening deck (6) rests on the trusses (5). Sifted mineral rock falls vertically downwards through recesses of the sieve deck (6). Mineral rock that is larger than the recesses of the screen deck (6) is moved by the excitation of the vibration systems (4) on the screen deck (6) along the conveying direction (F).
  • each vibration system (4) consists of two unbalance drives.
  • the respective two vibration systems (4) are arranged on the respective side wall (31, 32) such that each vibration system (4) overlaps a vibration node (S) of the respective side wall (31, 32). More precisely, the respective two vibration systems (4) are arranged on the respective side wall (31, 32) such that each vibration system (4) is arranged in the region of a vibration node (S) of the first bending mode of the respective side wall (31, 32).
  • the formulation area here preferably describes a maximum radius from the center of the vibration node (S) whose amount is less than or equal to 20%, preferably less than or equal to 10%, particularly preferably 0%, of the maximum main extension length of respective side wall (31 or 32), wherein the amount of the region is a maximum radius from the center of the vibration node (S) in particular anti-proportional to the maximum main extension length of the respective side wall (31 or 32).
  • the unbalance drives of each vibration system (4) are arranged such that each vibration node (S) is positioned between the unbalance drives.
  • each unbalance drive has an imbalance mass (8). Furthermore, not recognizable, each unbalance drive has a sensor unit (7) for determining a real-time angular position of the imbalance mass (8).
  • the screen (1) has a control system, not shown here, which is connected to the unbalance drives in order to set phase offsets of the unbalance drives.
  • 5 and 6 show in a schematic side view, the side wall (31 or 32) of the screening system (1) according to the invention with illustrated vibration node (S) of the first bending mode, wherein FIG. 6 is a simplified view of FIG.
  • the bending modes are shown simplified by lines.
  • FIG. 1 corresponds analogously to the side view of the screening system according to the teaching of the invention according to FIG. 5, wherein FIG. 1 shows no bending modes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

Système de tamisage (1) pour le tamisage de produit à tamiser, en particulier pour le tamisage de roche minérale, comprenant un crible (2), qui comprend deux parois latérales (31, 32) externes, au moins deux systèmes de vibration (4) étant disposés sur chacune des deux parois latérales (31, 32) pour l'excitation de vibrations et les deux parois latérales (31, 32) présentant chacune au moins deux nœuds de vibration (S) selon un mode de flexion, au moins deux traverses (5) qui relient les deux parois latérales (31, 32) entre elles, au moins une table de criblage (6), qui repose sur les au moins deux traverses (5), les deux systèmes de vibration (4) respectifs étant disposés de telle façon sur la paroi latérale respective (31, 32) que chaque système de vibration (4) est disposé dans la zone d'un nœud de vibration (S) de la paroi latérale respective (31, 32). L'invention concerne en outre un procédé pour le tamisage de produit à tamiser, en particulier pour le tamisage de roche minérale, au moyen d'un système de tamisage du type susmentionné.
EP18779718.8A 2017-10-13 2018-10-08 Système de tamisage comprenant des systèmes de vibration disposés aux noeuds de vibration Pending EP3694657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU100478A LU100478B1 (de) 2017-10-13 2017-10-13 Siebsystem mit schwingungsknotenangeordneten Schwingungssystemen
PCT/EP2018/077269 WO2019072741A1 (fr) 2017-10-13 2018-10-08 Système de tamisage comprenant des systèmes de vibration disposés aux nœuds de vibration

Publications (1)

Publication Number Publication Date
EP3694657A1 true EP3694657A1 (fr) 2020-08-19

Family

ID=60661915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18779718.8A Pending EP3694657A1 (fr) 2017-10-13 2018-10-08 Système de tamisage comprenant des systèmes de vibration disposés aux noeuds de vibration

Country Status (10)

Country Link
US (1) US20200254489A1 (fr)
EP (1) EP3694657A1 (fr)
CN (1) CN111278576B (fr)
AU (1) AU2018348287B2 (fr)
BR (1) BR112020007174B1 (fr)
CA (1) CA3078268C (fr)
CL (1) CL2020000964A1 (fr)
LU (1) LU100478B1 (fr)
RU (1) RU2730073C1 (fr)
WO (1) WO2019072741A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3789126A1 (fr) * 2019-09-06 2021-03-10 Siebtechnik GmbH Machine de criblage réglable
WO2022268540A1 (fr) * 2021-06-24 2022-12-29 Flsmidth A/S Commande à charge optimisée d'un dispositif de tamisage
WO2022268558A1 (fr) * 2021-06-24 2022-12-29 Flsmidth A/S Arrêt d'urgence d'un dispositif de tamisage en cas de dysfonctionnement d'une unité d'excitation à balourd
BE1029527B1 (de) * 2021-06-24 2023-01-30 Thyssenkrupp Ag Notabschaltung einer Siebvorrichtung bei Fehlfunktion einer Unwuchterregereinheit
BE1029526B1 (de) * 2021-06-24 2023-01-30 Thyssenkrupp Ind Solutions Ag Belastungsoptimiertes Ansteuern einer Siebvorrichtung
DE102022108307B3 (de) * 2022-04-06 2023-03-02 Heinrich Kühlert Schwingmaschine sowie Verfahren zum Betreiben der Schwingmaschine

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US2285348A (en) * 1940-06-26 1942-06-02 S S Bruce Material separator apparatus
DE1288980B (de) * 1967-06-10 1969-02-06 Gerhard Dr Ing Schwingnutzgeraet, insbesondere Laengsfoerderer
JPH04178180A (ja) * 1990-11-09 1992-06-25 Olympus Optical Co Ltd 超音波モータ
FR2676130B1 (fr) * 1991-04-30 1993-08-13 Skako Comessa Sa Systeme de commande automatique du dephasage dans un appareil vibrant.
DE9115834U1 (de) * 1991-05-22 1992-02-27 Hess Maschinenfabrik GmbH & Co KG, 5909 Burbach Unwuchtrüttler
DE4417162C1 (de) 1994-05-17 1995-08-17 Uhde Gmbh Vorrichtung zur Einstellung des Schwingverhaltens einer Schwingförderrinne
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AU3474599A (en) * 1998-04-17 1999-11-08 Emerson Electric Co. Vibratory screen separator
EP1740319B1 (fr) * 2004-03-26 2008-01-16 Ammann Schweiz AG Tamiseur vibrant et procede de fonctionnement d'un tamiseur vibrant
JP5843469B2 (ja) * 2011-04-26 2016-01-13 キヤノン株式会社 振動波モータ
RU134085U1 (ru) * 2013-03-12 2013-11-10 Закрытое акционерное общество Научно-производственное предприятие "Машпром" (ЗАО НПП "Машпром") Вибрационный грохот
CN203991254U (zh) * 2013-12-27 2014-12-10 宾德股份公司 筛分机
WO2016006433A1 (fr) * 2014-07-10 2016-01-14 株式会社村田製作所 Dispositif de vibration
CN104525477A (zh) * 2014-12-31 2015-04-22 奥瑞（天津）工业技术有限公司 一种多层弛张筛型筛分设备
CN104889053B (zh) * 2015-06-15 2017-05-10 贵州东峰锑业股份有限公司 一种矿山用筛分设备
CN205613694U (zh) * 2016-02-05 2016-10-05 宾德股份公司 筛分机

Also Published As

Publication number Publication date
CN111278576A (zh) 2020-06-12
LU100478B1 (de) 2019-05-22
BR112020007174B1 (pt) 2024-01-16
AU2018348287B2 (en) 2021-12-09
CN111278576B (zh) 2023-04-07
CA3078268A1 (fr) 2019-04-18
CL2020000964A1 (es) 2020-09-25
RU2730073C1 (ru) 2020-08-17
CA3078268C (fr) 2022-09-13
US20200254489A1 (en) 2020-08-13
BR112020007174A2 (pt) 2020-09-24
AU2018348287A1 (en) 2020-05-21
WO2019072741A1 (fr) 2019-04-18

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