EP3031527A1 - Screen system for a grinding device and grinding device using such a screen system - Google Patents

Screen system for a grinding device and grinding device using such a screen system Download PDF

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Publication number
EP3031527A1
EP3031527A1 EP14197012.9A EP14197012A EP3031527A1 EP 3031527 A1 EP3031527 A1 EP 3031527A1 EP 14197012 A EP14197012 A EP 14197012A EP 3031527 A1 EP3031527 A1 EP 3031527A1
Authority
EP
European Patent Office
Prior art keywords
sieve
grinding
screen
grinding device
piece
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.)
Withdrawn
Application number
EP14197012.9A
Other languages
German (de)
French (fr)
Inventor
Antoine Virdis
Christophe PASQUIER
Glenn Corminboeuf
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.)
FREWITT FABRIQUE DE MACHINES SA
Original Assignee
FREWITT FABRIQUE DE MACHINES SA
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 FREWITT FABRIQUE DE MACHINES SA filed Critical FREWITT FABRIQUE DE MACHINES SA
Priority to EP14197012.9A priority Critical patent/EP3031527A1/en
Priority to PCT/IB2015/059413 priority patent/WO2016092456A1/en
Priority to US15/533,689 priority patent/US20180207642A1/en
Priority to CN201580075699.0A priority patent/CN107206429A/en
Publication of EP3031527A1 publication Critical patent/EP3031527A1/en
Withdrawn legal-status Critical Current

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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
    • B07B1/06—Cone or disc shaped screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/26—Details
    • B02C13/282—Shape or inner surface of mill-housings
    • B02C13/284—Built-in screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/062—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives with rotor elements extending axially in close radial proximity of a concentrically arranged slotted or perforated ring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • 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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469—Perforated sheet-like material
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/16—Separating or sorting of material, associated with crushing or disintegrating with separator defining termination of crushing or disintegrating zone, e.g. screen denying egress of oversize material
    • B02C2023/165—Screen denying egress of oversize material
    • 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

Definitions

  • the present invention relates to a sieve system for a grinding device for materials, particularly powdery materials, which allows a better flow rate of the material through the sieve during the grinding operation.
  • the invention also relates to a grinding device comprising such a sieve system.
  • the known grinding treatment systems for a material such as a solid or powdery substance intended for the manufacture of a pharmaceutical, food or other product, use a rotor rotatably mounted against a filtering part, or sieve.
  • the material to be granulated is pressed between the rotor and the screen.
  • the screen is typically designed in two or more elements, for example a canvas and a frame, interconnected by different chemical means (glue) or mechanical (welding).
  • the sieve is used to sort the crushed material as it flows through the sieve.
  • the sieve is generally composed of a sieving cloth surrounded by a frame, or welded sheets.
  • the fragility of thin sheets requires that they be supported by thicker sheets, forming a rigid frame. This connection between the thin sheet and the thicker part of the frame is however not ideal when combined with the use of the rotor pressing the material against the screen.
  • a sieve architecture in several components interconnected generates a fragility of the sieve. Indeed, during the grinding operation in which the material is pressed against the sieve, the welds between the sheets are likely to be weakened, potentially leading to a risk of deterioration of the sieve. Indeed the manufacture of sieves for grinding machine is conventionally obtained by welding between a sheet of thin perforated thickness to let the treated materials to a thicker sheet used as cradles. The two metal plates are thus bonded by mechanical or chemical means, which can be described as fragile or of little effectiveness since their connection whatever it may be may be deteriorated by the weight of the treated materials. Such an arrangement further promotes a high rate of retention of materials. The milled material can thus infiltrate gaps between the perforated plate and the thick plate. This can increase the clogging effect of the milled material in the sieve.
  • the patent application FR2682050 relates to a sieving device comprising a support frame carrying at least one vibrating casing, equipped with a frame carrying a sieving cloth.
  • the frame is in the form of a rigid structure that carries a screen cloth.
  • the screen fabric is bonded to this frame via a glue joint.
  • a sonotrode coupled to an electro-acoustic converter is fixed to the frame by means of screws.
  • the ultrasonic vibrations generated by the sonotrode are transmitted to the fabric via the frame and the glue joint.
  • the displacement that can be given to the sieving cloth being limited for mechanical reasons, the increase of the acceleration must therefore result from the increase of the frequency of the vibration.
  • the document WO13004229 discloses a sieve frame for an ultrasonic sieve which includes an upper face for attaching a screen cloth, a bottom face opposite to the top face, and an opening surrounded in the sieve frame.
  • the frame of the sieve has at least one groove extending around the opening so that the part of the frame which is located in the edge of the groove points towards the opening, and the opening forms an acoustic fabric conductor which is at least partially decoupled from the rest of the frame, from the point of view of the transmission of ultrasound.
  • the sieve architecture here is composed of two or more structured parts.
  • the document WO08040540 relates to a device for activating a filter fabric encircled with a filter frame, by means of ultrasound.
  • This ultrasound means comprises a transition piece and / or an ultrasound conductor, and means for introducing the ultrasound into the filter fabric, in particular an ultrasound conductor.
  • the ultrasonic transport system travels in a passageway through the filter frame and is attached thereto.
  • the sieve is non-metallic, it resides in a device in two parts comprising on the one hand a filtering textile, and on the other hand a filter frame.
  • the patent application FR2768948 proposes an assistance device for sieving and unclogging the fabric of a sieve which comprises a vibrating structure which is in contact with the screen fabric, and which is vibrated by a wave generator, in particular ultrasonic.
  • This structure consists of a piece having in section, the shape of an L returned with a base and a shoulder; the lower face of said base is connected to the generator and at least the end of the shoulder is in integral contact with the fabric, which overflows on either side of the base.
  • the sieve referred to in this document is a two-part non-metallic device attached to a wave generator.
  • the invention provides various technical means.
  • a first object of the invention is to provide a sieve system for a grinding process, in particular solid or powdery materials, for carrying out the grinding method in continuous flow mode.
  • Another object of the invention allows the grinding of powdery materials with a fluid circulation of the powdery materials avoiding possible risks of stagnation thereof in the sieve, that is to say by minimizing the clogging of the material crushed in the sieve
  • Yet another object of the invention is to provide a sieve configuration that allows to reduce the risk of deterioration of the screen when vibrations are transmitted on its structure to facilitate the flow of powdery materials.
  • Another object of the invention is further to ensure optimal transmission of ultrasonic vibrations exerted on the sieve.
  • the one-piece sieve has advantageous characteristics.
  • a one-piece arrangement allows easy circulation of powdery materials as part of the treatment by grinding, greatly reducing the risk of stagnation, or clogging, of materials.
  • Such a configuration also allows to avoid the risk of damage to the object when vibrations are exerted on it continuously.
  • the use of a one-piece sieve makes it possible to increase the grinding efficiency and to reduce the micro-heating.
  • such a sieve configuration makes it possible to envisage a grinding treatment system for various categories of solid or powdery materials.
  • the screen constitutes a one-piece element in which the filtering portion is integral with the support part.
  • This one-piece and single-material configuration makes it possible to optimize the level of transmission of the frame towards the filtering part, for a better overall efficiency of the grinding system.
  • the screen constitutes a one-piece element which is made of metal alloy.
  • the support consists of a surface provided with a plurality of openings, each being provided with a filtration zone having openings adapted to this function.
  • the one-piece element is obtained by chemical machining using specific masks.
  • the chemical machining is preferably carried out by placing a raw plate in a chemical bath on which masks sized respectively for the support part and for the filtering part are affixed.
  • the screen is connected by a connector ring to a vibration generator facilitating the continuous flow of powdery materials through the filtering portion.
  • the invention also provides a grinding device comprising a sieve consisting of a one-piece element. Vibrations generated by a vibration generator can be exerted on the screen, all of which is an integral part of an enclosure, grouping the functional elements of said device.
  • the figure 1 illustrates an embodiment of a screen 1 for a grinding device, in a perspective view where the screen is shown flat.
  • the one-piece sieve 1 is made of a metal alloy material, consisting of a filter portion 6 and a support portion 5 arranged to form a single block.
  • the support part 5 is provided with large openings 3 in which the elements of the filtering part 6 appear.
  • the support part constitutes a thick and solid element, ensuring the screen 1 a certain rigidity.
  • the filtering portion 6 is composed of thin openings 4 in order to facilitate a fluid flow rate of materials.
  • Such a one-piece sieve arrangement 1 allows, as opposed to prior sieves consisting of several glued or welded elements, to prevent powdery materials are likely to interfere in cavities, nonexistent in this architecture.
  • the shapes and dimensions specific to the different openings of the one-piece sieve are here represented in circular form; however, the rounded shape is not exhaustive since a multitude of shapes can be envisaged to fulfill the same function.
  • the figure 2 is a perspective representation of a part of the one-piece sieve 1 included in a grinding device 10, hammer mill type grinder.
  • the grinding device 10 comprises an enclosure 11 which defines a grinding chamber 16, which can be filled with the material to be ground, a rotor assembly 12 rotatably mounted in the enclosure 11 and a screen 1 for splitting the material ground by the rotor assembly 12, which moves and unfolds below the rotor assembly 12.
  • a drive unit 20 is arranged to control the movements of the rotor assembly 12 relative to the screen 1 during the grinding operation.
  • the figure 3 illustrates another example of a grinding device 10 as a whole, here a conical sieve type shown in section, using a one-piece sieve 1 as previously described.
  • This system is integrated in a tubular protection enclosure 11 defining the grinding chamber 16 and in which the screen 1 is mounted coaxially.
  • the screen 1 is of frustoconical shape which narrows downwards.
  • a rotor assembly 12 is rotatably mounted in the screen 1.
  • the rotor 12 comprises two symmetrical milling blades 121 arranged so that the space between each blade 121 and the screen is substantially constant.
  • the rotor 12 rotates relative to the inner wall of the screen 1 so as to press the material to be grinded from the top of the chamber 26 against the screen 1 and passing it through the openings 4 of the screen 1.
  • the enclosure 11 of protection makes it possible to dispose the functional assembly of a grinding system of powdery materials in a closed and protected environment so that the grinding process can be carried out under specifically controlled conditions.
  • the enclosure 11 is delimited by a wall 13 whose dimensions are adapted according to the volume required to house the functional assembly of the grinding system.
  • the one-piece sieve 1 shown in the various figures, at various angles, is a one-piece sieve 1 of metal alloy. This one-piece element is obtained by means of a specific manufacturing process by chemical machining which opposes the previously known sieve manufacturing process.
  • the manufacture of the one-piece sieve is made possible by chemical machining.
  • a raw plate is immersed in a chemical bath. Different masks are used on both sides of the plate.
  • the perforation depths are then accurately managed to obtain a filamentous portion 6 with thin openings on one side 4, and a support part 5 with wide openings 3 on the other.
  • the one-piece sieve 1 is coupled to a vibration generator 7 through a connector ring 12, surrounding the sieve 1.
  • a vibration generator 7 Such a configuration has the effect of facilitating the flow of the milled material through 1.
  • the effect of the vibration prevents the material from agglomerating in the openings 4 of the sieve 1 during the grinding operation, thus allowing a continuous flow of the milled material, without human intervention.
  • the vibrations generated by the vibration generator 7 are transmitted to the filtering portion of the screen 6 in a very efficient manner. This leads to an acceleration of the circulation of the crushed material, in particular to avoid the risk of stagnation of powdery materials.
  • the one-piece architecture also prevents embrittlement of the sieve by the vibrations exerted when the latter is devoid of bonding areas or welding.
  • the vibration generator 7 is coupled to the connector ring 12 via a vibration-conducting arm 9 and an adapter 8, or connector.
  • the figure 4 is a perspective representation of the same grinding system as that of the figure 3 but where the internal elements of the protective enclosure 11 are shown outside thereof, in order to further visualize certain functional elements of the vibration chain, and in particular the vibration-transmitting ring 12.
  • the coupling of the vibration generator 7 to the screen 1 may be provided by a configuration other than that of the connector ring 12 illustrated in FIGS. figures 2 and 4 .
  • the vibration generator 7 can be coupled directly to the support portion 5 of the screen 1.
  • the vibration generator 7 is coupled to the screen 1 via an arc 12 disposed at one end of the sieve 1 of cylindrical shape.
  • the enclosure 11 allows not only grinding of the powdery materials in a healthy and opaque environment, but also serves to collect the powdery materials having passed through the sieve 1 piece.
  • the grinding system of the powdery materials by grinding thus allows a treatment of continuous material without human intervention, through the combination between the monobloc sieve 1 and the vibration device 7, 8, 9.
  • the dimensions of the enclosure 11 are also advantageously defined so as to take into account the vibration device connected with a sieve.
  • the flow rate of the material through the screen can be up to 50% greater than the flow rate achieved by using a screen comprising two or more several parts and in the absence of vibration exerted on the sieve. There is therefore less retention of material in the grinding chamber thus improving the yield of the grinding operation.
  • Other advantages include the lower temperature generated by the grinding operation and less power to rotate the rotor during the grinding operation.
  • the treatment system previously described is advantageously used in the context of a process for treating materials, in particular powdery materials, with steps involving mechanical operations carried out on the material, such as, for example, sieving, centrifugation, weighing, sorting, granulometry, or other mechanical operation.
  • the process is particularly suitable for powdery materials, without excluding other forms of material, for example granular.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)

Abstract

Système de tamis (1) pour un dispositif de broyage permettant le traitement de la granulométrie de matières, en particulier de matières solides ou poudreuses, comprenant une partie filtrante (6) à fines ouvertures (4) destinée à coopérer avec un rotor du dispositif de broyage de manière à presser la matière à broyer à travers la partie filtrante (6); et une partie support (5) à larges ouvertures (3) permettant le renforcement de la partie filtrante. Le tamis peut être couplé à un dispositif de vibrations. Le système de tamis permet de réaliser un procédé de broyage en mode de flux continu avec un débit d'écoulement de la matière au travers du tamis jusqu'à 50% supérieur au débit atteint en utilisant un tamis conventionnel.Sieve system (1) for a grinding device for the treatment of the granulometry of materials, in particular solid or powdery materials, comprising a filter portion (6) with fine openings (4) for cooperating with a rotor of the device grinding so as to press the material to be grinded through the filtering portion (6); and a support portion (5) with wide openings (3) for reinforcing the filtering part. The screen may be coupled to a vibration device. The sieve system enables a continuous flow mode grinding process with a flow rate of material through the screen up to 50% greater than the flow rate achieved using a conventional sieve.

Description

Domaine techniqueTechnical area

La présente invention concerne un système de tamis pour un dispositif de broyage de matières, en particulier de matières poudreuses permettant un meilleur débit d'écoulement de la matière au travers du tamis pendant l'opération de broyage. L'invention concerne également un dispositif de broyage comportant un tel système de tamis.The present invention relates to a sieve system for a grinding device for materials, particularly powdery materials, which allows a better flow rate of the material through the sieve during the grinding operation. The invention also relates to a grinding device comprising such a sieve system.

Etat de la techniqueState of the art

De façon générale, les systèmes connus de traitement par broyage d'une matière telle qu'une substance solide ou poudreuse destinée à la fabrication d'un produit pharmaceutique, alimentaire ou autre, utilisent un rotor monté rotatif contre une partie filtrante, ou tamis. Le matériau à granuler est pressée entre le rotor et le tamis. Le tamis est typiquement conçu en deux ou plusieurs éléments, par exemple une toile et un cadre, reliés entre eux par différents moyens chimiques (colle) ou mécaniques (soudure).In general, the known grinding treatment systems for a material such as a solid or powdery substance intended for the manufacture of a pharmaceutical, food or other product, use a rotor rotatably mounted against a filtering part, or sieve. The material to be granulated is pressed between the rotor and the screen. The screen is typically designed in two or more elements, for example a canvas and a frame, interconnected by different chemical means (glue) or mechanical (welding).

Le tamis permet de trier la matière broyée lors de son écoulement au travers du tamis. Le tamis est généralement composé d'une toile de tamisage entourée d'un cadre, ou encore de tôles soudées. La fragilité des tôles fines nécessite qu'elles soient supportées par des tôles plus épaisses, formant un cadre rigide. Cette liaison entre la tôle fine et celle plus épaisse du cadre n'est cependant pas idéale lorsqu'elle est combinée à l'utilisation du rotor pressant la matière contre le tamis.The sieve is used to sort the crushed material as it flows through the sieve. The sieve is generally composed of a sieving cloth surrounded by a frame, or welded sheets. The fragility of thin sheets requires that they be supported by thicker sheets, forming a rigid frame. This connection between the thin sheet and the thicker part of the frame is however not ideal when combined with the use of the rotor pressing the material against the screen.

Une architecture de tamis en plusieurs composants reliés entre eux engendre une fragilité du tamis. En effet, pendant l'opération de broyage dans laquelle la matière est pressée contre le tamis, les soudures entre les tôles sont susceptibles d'être fragilisées, conduisant potentiellement à un risque de détérioration du tamis. En effet la fabrication de tamis pour machine de broyage est classiquement obtenue par la soudure entre une tôle de fine épaisseur perforée afin de laisser passer les matières traitées, à une tôle plus épaisse servant de berceaux. Les deux plaques métalliques sont ainsi liées par des moyens mécaniques ou chimiques, pouvant être qualifiés de fragiles ou de peu efficaces dès lors que leur liaison quelle qu'elle soit, peut être détériorée par le poids des matières traitées. Un tel agencement favorise de plus un taux élevé de rétention des matières. La matière broyée peut donc s'infiltrer dans des interstices entre la tôle perforée et la tôle épaisse. Ceci peut augmenter l'effet de colmatage de la matière broyée dans le tamis.A sieve architecture in several components interconnected generates a fragility of the sieve. Indeed, during the grinding operation in which the material is pressed against the sieve, the welds between the sheets are likely to be weakened, potentially leading to a risk of deterioration of the sieve. Indeed the manufacture of sieves for grinding machine is conventionally obtained by welding between a sheet of thin perforated thickness to let the treated materials to a thicker sheet used as cradles. The two metal plates are thus bonded by mechanical or chemical means, which can be described as fragile or of little effectiveness since their connection whatever it may be may be deteriorated by the weight of the treated materials. Such an arrangement further promotes a high rate of retention of materials. The milled material can thus infiltrate gaps between the perforated plate and the thick plate. This can increase the clogging effect of the milled material in the sieve.

La demande de brevet FR2682050 concerne un dispositif de tamisage comportant un châssis support portant au moins une carcasse vibrante, équipée d'un cadre portant une toile de tamisage. Le cadre se présente sous la forme d'une structure rigide qui porte une toile de tamisage. La toile de tamisage est liée à ce cadre par l'intermédiaire d'un joint de colle. Une sonotrode couplée à un convertisseur électro-acoustique est fixée au cadre par l'intermédiaire de vis. Les vibrations ultrasoniques générées par la sonotrode sont transmises à la toile par l'intermédiaire du cadre et du joint de colle. Le déplacement que l'on peut donner à la toile de tamisage étant limité pour des raisons mécaniques, l'augmentation de l'accélération doit donc résulter de l'augmentation de la fréquence de la vibration. L'intérêt est par conséquent de superposer à la vibration dite mécanique de la toile de tamisage, une vibration ultrasonique dont la fréquence se situe entre 16 000 et 40 000 Hz. Ce document se réfère par conséquent à un dispositif de tamisage en deux parties, le tamis étant fixé au cadre du tamis par collage. Une telle architecture de tamis ne permet pas une transmission totalement efficace des vibrations.The patent application FR2682050 relates to a sieving device comprising a support frame carrying at least one vibrating casing, equipped with a frame carrying a sieving cloth. The frame is in the form of a rigid structure that carries a screen cloth. The screen fabric is bonded to this frame via a glue joint. A sonotrode coupled to an electro-acoustic converter is fixed to the frame by means of screws. The ultrasonic vibrations generated by the sonotrode are transmitted to the fabric via the frame and the glue joint. The displacement that can be given to the sieving cloth being limited for mechanical reasons, the increase of the acceleration must therefore result from the increase of the frequency of the vibration. The interest is therefore to superimpose on the so-called mechanical vibration of the screening screen, an ultrasonic vibration whose frequency is between 16 000 and 40 000 Hz. This document therefore refers to a two-part sieving device, the sieve being attached to the sieve frame by gluing. Such a sieve architecture does not allow a totally effective transmission of vibrations.

Le document WO13004229 propose un cadre de tamis pour un tamis à ultrasons qui comprend une face supérieure permettant la fixation d'une toile de tamisage, une face inférieure opposée à la face supérieure, et une ouverture entourée dans le cadre du tamis. Le cadre du tamis comporte au moins une rainure s'étendant autour de l'ouverture de sorte que la partie du cadre qui est située dans le bord de la rainure oriente vers l'ouverture, et l'ouverture forme un conducteur acoustique de toile qui est au moins partiellement découplé du reste du cadre, du point de vue de la transmission des ultrasons. L'architecture du tamis est ici composée de deux ou plusieurs parties structurées.The document WO13004229 discloses a sieve frame for an ultrasonic sieve which includes an upper face for attaching a screen cloth, a bottom face opposite to the top face, and an opening surrounded in the sieve frame. The frame of the sieve has at least one groove extending around the opening so that the part of the frame which is located in the edge of the groove points towards the opening, and the opening forms an acoustic fabric conductor which is at least partially decoupled from the rest of the frame, from the point of view of the transmission of ultrasound. The sieve architecture here is composed of two or more structured parts.

Le document WO08040540 concerne un dispositif destiné à activer un textile filtrant cerclé d'un cadre de filtre, au moyen d'ultrasons. Ce moyen d'ultrasons comprend une pièce de transition et/ou un conducteur d'ultrasons, et des moyens destinés à introduire les ultrasons dans le textile filtrant, en particulier un conducteur d'ultrasons. Le système de transport d'ultrasons chemine dans un passage à travers le cadre de filtre et est fixé à celui-ci. Le tamis est non métallique, il réside dans un dispositif en deux parties comprenant d'une part un textile filtrant, et d'autre part un cadre de filtre.The document WO08040540 relates to a device for activating a filter fabric encircled with a filter frame, by means of ultrasound. This ultrasound means comprises a transition piece and / or an ultrasound conductor, and means for introducing the ultrasound into the filter fabric, in particular an ultrasound conductor. The ultrasonic transport system travels in a passageway through the filter frame and is attached thereto. The sieve is non-metallic, it resides in a device in two parts comprising on the one hand a filtering textile, and on the other hand a filter frame.

La demande de brevet FR2768948 propose un dispositif d'assistance au tamisage et au décolmatage de la toile d'un tamis qui comprend une structure vibrante qui est en contact avec la toile du tamis, et qui est mise en vibrations par un générateur d'ondes, notamment ultrasonores. Cette structure consiste en une pièce ayant en section, la forme d'un L retourné avec une base et un épaulement ; la face inférieure de ladite base est raccordée au générateur et au moins l'extrémité de l'épaulement est en contact solidaire avec la toile, qui déborde de part et d'autre de la base. Le tamis évoqué dans ce document est un dispositif non métallique en deux parties rattaché à un générateur d'ondes.The patent application FR2768948 proposes an assistance device for sieving and unclogging the fabric of a sieve which comprises a vibrating structure which is in contact with the screen fabric, and which is vibrated by a wave generator, in particular ultrasonic. This structure consists of a piece having in section, the shape of an L returned with a base and a shoulder; the lower face of said base is connected to the generator and at least the end of the shoulder is in integral contact with the fabric, which overflows on either side of the base. The sieve referred to in this document is a two-part non-metallic device attached to a wave generator.

Les documents suscités se cantonnent cependant à l'utilisation de tamis constitués de plusieurs éléments.The documents evoked, however, are limited to the use of sieves consisting of several elements.

Pour pallier ces différents inconvénients, l'invention prévoit différents moyens techniques.To overcome these various disadvantages, the invention provides various technical means.

Bref résumé de l'inventionBrief summary of the invention

Tout d'abord, un premier objet de l'invention consiste à prévoir un système de tamis pour un procédé de broyage, en particulier de matières solide ou poudreuses, permettant de réaliser le procédé de broyage en mode de flux continu,.Firstly, a first object of the invention is to provide a sieve system for a grinding process, in particular solid or powdery materials, for carrying out the grinding method in continuous flow mode.

Un autre objet de l'invention permet le broyage de matières poudreuses avec une circulation fluide des matières poudreuses en évitant d'éventuels risques de stagnation de celles-ci dans le tamis, c'est-à-dire en réduisant au maximum le colmatage de la matière broyée dans le tamisAnother object of the invention allows the grinding of powdery materials with a fluid circulation of the powdery materials avoiding possible risks of stagnation thereof in the sieve, that is to say by minimizing the clogging of the material crushed in the sieve

Encore un autre objet de l'invention consiste à prévoir une configuration du tamis qui permette de restreindre les risques de détérioration du tamis lorsque des vibrations sont transmises sur sa structure afin de faciliter l'écoulement des matières poudreuses.Yet another object of the invention is to provide a sieve configuration that allows to reduce the risk of deterioration of the screen when vibrations are transmitted on its structure to facilitate the flow of powdery materials.

Un autre objet de l'invention vise de plus à garantir la transmission optimale des vibrations par ultrasons exercées sur le tamis.Another object of the invention is further to ensure optimal transmission of ultrasonic vibrations exerted on the sieve.

Pour ce faire, l'invention prévoit un système de tamis pour un dispositif de broyage, comprenant:

  • une partie filtrante à fines ouvertures destinée à coopérer avec un rotor du dispositif de broyage de manière à presser la matière à broyer à travers la partie filtrante;
  • une partie support permettant le renforcement de la partie filtrante;
  • les deux parties constituant un élément monopièce.
To do this, the invention provides a sieve system for a grinding device, comprising:
  • a fine-opening filtering portion for cooperating with a rotor of the grinding device to press the material to be grinded through the filtering portion;
  • a support portion for reinforcing the filtering portion;
  • the two parts constituting a one-piece element.

Selon une telle configuration, le tamis monobloc présente des caractéristiques avantageuses. Un agencement monopièce permet en effet une circulation aisée des matières poudreuses dans le cadre du traitement par broyage, en diminuant fortement les risques de stagnation, ou de colmatage, de matières. Une telle configuration permet de plus d'éviter les risques de détérioration de l'objet lorsque des vibrations sont exercées sur celui-ci de manière continue. Le recours à un tamis monopièce permet d'accroitre le rendement de broyage et de diminuer les micro échauffements. De plus, une telle configuration de tamis permet d'envisager un système de traitement par broyage de diverses catégories de matières solides ou poudreuses.According to such a configuration, the one-piece sieve has advantageous characteristics. A one-piece arrangement allows easy circulation of powdery materials as part of the treatment by grinding, greatly reducing the risk of stagnation, or clogging, of materials. Such a configuration also allows to avoid the risk of damage to the object when vibrations are exerted on it continuously. The use of a one-piece sieve makes it possible to increase the grinding efficiency and to reduce the micro-heating. In addition, such a sieve configuration makes it possible to envisage a grinding treatment system for various categories of solid or powdery materials.

Selon un mode de réalisation avantageux, le tamis constitue un élément monopièce dans lequel la partie filtrante est venue de matière avec la partie support. Cette configuration monopièce et monomatériau permet d'optimiser le niveau de transmission du cadre vers la partie filtrante, pour une meilleure efficacité globale du système de broyage.According to an advantageous embodiment, the screen constitutes a one-piece element in which the filtering portion is integral with the support part. This one-piece and single-material configuration makes it possible to optimize the level of transmission of the frame towards the filtering part, for a better overall efficiency of the grinding system.

Selon un autre mode de réalisation de l'invention, le tamis constitue un élément monopièce qui est en alliage métallique.According to another embodiment of the invention, the screen constitutes a one-piece element which is made of metal alloy.

Selon une variante avantageuse, le support est constitué d'une surface pourvue d'une pluralité d'ouvertures, chacune étant pourvue d'une zone de filtration comportant des ouvertures adaptées à cette fonction.According to an advantageous variant, the support consists of a surface provided with a plurality of openings, each being provided with a filtration zone having openings adapted to this function.

De manière avantageuse, l'élément monopièce est obtenu par usinage chimique à l'aide de masques spécifiques.Advantageously, the one-piece element is obtained by chemical machining using specific masks.

Selon un autre mode de réalisation, l'usinage chimique est préférentiellement effectué par le placement d'une plaque brute dans un bain chimique sur laquelle sont apposés des masques dimensionnés respectivement pour la partie support et pour la partie filtrante.According to another embodiment, the chemical machining is preferably carried out by placing a raw plate in a chemical bath on which masks sized respectively for the support part and for the filtering part are affixed.

De manière avantageuse, le tamis est relié par un anneau connecteur à un générateur de vibrations facilitant l'écoulement en continu de matières poudreuses à travers la partie filtrante.Advantageously, the screen is connected by a connector ring to a vibration generator facilitating the continuous flow of powdery materials through the filtering portion.

L'invention prévoit également un dispositif de broyage comprenant un tamis constitué d'un élément monopièce. Des vibrations engendrées par un générateur de vibration peuvent être exercées sur le tamis, le tout faisant partie intégrante d'une enceinte, regroupant les éléments fonctionnels dudit dispositif.The invention also provides a grinding device comprising a sieve consisting of a one-piece element. Vibrations generated by a vibration generator can be exerted on the screen, all of which is an integral part of an enclosure, grouping the functional elements of said device.

Brève description des figuresBrief description of the figures

Des exemples de mise en oeuvre de l'invention sont indiqués dans la description illustrée par les figures annexées dans lesquelles :

  • la figure 1 est une vue de la plaque composant le tamis, après perforation des ouvertures multiples et délimitation du support ;
  • la figure 2 est une vue en perspective d'une partie du tamis monopièce comprise dans un dispositif de broyage, selon un mode de réalisation;
  • la figure 3 est une vue en coupe d'un système de tamis compris dans un dispositif de broyage selon un autre mode de réalisation; et
  • la figure 4 est une représentation en perspective de l'ensemble fonctionnel de dispositif de broyage comprenant le système de tamis en dehors de l'enceinte du dispositif de broyage, selon un autre mode de réalisation.
Examples of implementation of the invention are indicated in the description illustrated by the appended figures in which:
  • the figure 1 is a view of the plate making up the sieve, after perforation of the multiple openings and delimitation of the support;
  • the figure 2 is a perspective view of a part of the one-piece sieve included in a grinding device, according to one embodiment;
  • the figure 3 is a sectional view of a sieve system included in a grinding device according to another embodiment; and
  • the figure 4 is a perspective representation of the grinding apparatus functional assembly comprising the sieve system outside the grinding chamber enclosure according to another embodiment.

Exemple(s) de mode de réalisation de l'inventionExample (s) of embodiment of the invention

La figure 1 illustre un exemple de réalisation d'un tamis 1 pour un dispositif de broyage, dans une vue en perspective où le tamis est représenté à plat. Le tamis monopièce 1 est constitué d'un matériau en alliage métallique, composé d'une partie filtrante 6 et d'une partie support 5 agencées de manière à former un seul bloc. La partie support 5 est pourvue de larges ouvertures 3 dans lesquelles figurent les éléments de la partie filtrante 6. La partie support constitue un élément épais et solide, assurant au tamis 1 une certaine rigidité. La partie filtrante 6 est composée de fines ouvertures 4 afin de faciliter un débit fluide d'écoulement des matières. Un tel agencement en tamis monopièce 1 permet, par opposition aux tamis antérieurs constitués de plusieurs éléments collés ou soudés, d'éviter que les matières poudreuses soient susceptibles de s'immiscer dans des cavités, inexistantes dans cette architecture. Les formes et dimensions propres aux différentes ouvertures du tamis monopièce sont ici représentées sous forme circulaire; toutefois la forme arrondie n'est pas exhaustive puisque une multitude de formes peuvent être envisagées pour remplir la même fonction.The figure 1 illustrates an embodiment of a screen 1 for a grinding device, in a perspective view where the screen is shown flat. The one-piece sieve 1 is made of a metal alloy material, consisting of a filter portion 6 and a support portion 5 arranged to form a single block. The support part 5 is provided with large openings 3 in which the elements of the filtering part 6 appear. The support part constitutes a thick and solid element, ensuring the screen 1 a certain rigidity. The filtering portion 6 is composed of thin openings 4 in order to facilitate a fluid flow rate of materials. Such a one-piece sieve arrangement 1 allows, as opposed to prior sieves consisting of several glued or welded elements, to prevent powdery materials are likely to interfere in cavities, nonexistent in this architecture. The shapes and dimensions specific to the different openings of the one-piece sieve are here represented in circular form; however, the rounded shape is not exhaustive since a multitude of shapes can be envisaged to fulfill the same function.

La figure 2 est une représentation en perspective d'une partie du tamis monopièce 1 comprise dans un dispositif de broyage 10, de type broyeur de moulin à marteaux. Dans l'exemple illustré, le dispositif de broyage 10 comprend une enceinte 11 qui définit une chambre 16 de broyage, laquelle peut être remplie de la matière à broyer, un ensemble rotor 12 monté rotatif dans l'enceinte 11 et un tamis 1 pour fractionner la matière broyée par l'ensemble rotor 12, qui se déplace et se déploie au-dessous de l'ensemble rotor 12. Une unité d'entrainement 20 est conçue pour commander les mouvements de l'ensemble rotor 12 par rapport au tamis 1 pendant l'opération de broyage.The figure 2 is a perspective representation of a part of the one-piece sieve 1 included in a grinding device 10, hammer mill type grinder. In the example illustrated, the grinding device 10 comprises an enclosure 11 which defines a grinding chamber 16, which can be filled with the material to be ground, a rotor assembly 12 rotatably mounted in the enclosure 11 and a screen 1 for splitting the material ground by the rotor assembly 12, which moves and unfolds below the rotor assembly 12. A drive unit 20 is arranged to control the movements of the rotor assembly 12 relative to the screen 1 during the grinding operation.

La figure 3 illustre un autre exemple d'un dispositif de broyage 10 dans son ensemble, ici un type à tamis conique représenté en coupe, utilisant un tamis monopièce 1 tel que précédemment décrit. Ce système est intégré dans une enceinte 11 de protection tubulaire définissant la chambre 16 de broyage et dans laquelle le tamis 1 est monté de façon coaxiale. Le tamis 1 est de forme tronconique qui se rétrécie vers le bas.. Un ensemble rotor 12 est monté rotatif dans le tamis 1. Dans la configuration illustrée à la figure 3, le rotor 12 comprend deux lames 121 de broyage symétriques arrangées pour que l'espace entre chaque lame 121 et le tamis soit essentiellement constant. Pendant une opération de broyage, le rotor 12 tourne par rapport à la paroi intérieure du tamis 1 de manière à presser la matière à broyer provenant du haut de la chambre 26 contre le tamis 1 et en la faisant passer au travers des ouvertures 4 du tamis 1.The figure 3 illustrates another example of a grinding device 10 as a whole, here a conical sieve type shown in section, using a one-piece sieve 1 as previously described. This system is integrated in a tubular protection enclosure 11 defining the grinding chamber 16 and in which the screen 1 is mounted coaxially. The screen 1 is of frustoconical shape which narrows downwards. A rotor assembly 12 is rotatably mounted in the screen 1. In the configuration illustrated in FIG. figure 3 the rotor 12 comprises two symmetrical milling blades 121 arranged so that the space between each blade 121 and the screen is substantially constant. During a grinding operation, the rotor 12 rotates relative to the inner wall of the screen 1 so as to press the material to be grinded from the top of the chamber 26 against the screen 1 and passing it through the openings 4 of the screen 1.

L'enceinte 11 de protection permet de disposer l'ensemble fonctionnel d'un système de broyage de matières poudreuses dans un environnement fermé et protégé afin que le procédé de broyage puisse être effectué dans des conditions spécifiquement contrôlées. Dans l'exemple illustré, l'enceinte 11 est délimitée par une paroi 13 dont les dimensions sont adaptées en fonction du volume requis pour loger l'ensemble fonctionnel du système de broyage.The enclosure 11 of protection makes it possible to dispose the functional assembly of a grinding system of powdery materials in a closed and protected environment so that the grinding process can be carried out under specifically controlled conditions. In the illustrated example, the enclosure 11 is delimited by a wall 13 whose dimensions are adapted according to the volume required to house the functional assembly of the grinding system.

Le tamis monobloc 1 représenté dans les différentes figures, sous des angles variés, est un tamis monopièce 1 en alliage métallique. Cet élément monopièce est obtenu grâce à un procédé de fabrication spécifique par usinage chimique qui s'oppose au procédé de fabrication de tamis antérieurement connu.The one-piece sieve 1 shown in the various figures, at various angles, is a one-piece sieve 1 of metal alloy. This one-piece element is obtained by means of a specific manufacturing process by chemical machining which opposes the previously known sieve manufacturing process.

La fabrication du tamis monopièce est rendue possible par usinage chimique. Une plaque brute est plongée dans un bain chimique. On utilise des masques différents sur les deux faces de la plaque. Les profondeurs de perforations sont ensuite gérées de manière précise afin d'obtenir une partie filtante 6 à fines ouvertures d'un côté 4, et une partie support 5 à larges ouvertures 3 de l'autre.The manufacture of the one-piece sieve is made possible by chemical machining. A raw plate is immersed in a chemical bath. Different masks are used on both sides of the plate. The perforation depths are then accurately managed to obtain a filamentous portion 6 with thin openings on one side 4, and a support part 5 with wide openings 3 on the other.

Dans un mode de réalisation, le tamis monopièce 1 est couplé à un générateur de vibrations 7 par l'entremise d'un anneau connecteur 12, entourant le tamis 1. Une telle configuration a pour effet de faciliter l'écoulement de la matière broyée au travers du tamis 1. L'effet de la vibration permet d'éviter que la matière vienne s'agglomérer dans les ouvertures 4 du tamis 1 pendant l'opération de broyage, permettant ainsi un flux continu de la matière broyée, sans intervention humaine. En effet, les vibrations engendrées par le générateur de vibrations 7 sont transmises à la partie filtrante du tamis 6 de manière très efficace. Cela entraine une accélération de la circulation de la matière broyée, en permettant notamment d'éviter les risques de stagnation des matières poudreuses. L'architecture monopièce empêche par ailleurs la fragilisation du tamis par les vibrations exercées dès lors que ce dernier est dépourvu de zones de collage ou de soudure.In one embodiment, the one-piece sieve 1 is coupled to a vibration generator 7 through a connector ring 12, surrounding the sieve 1. Such a configuration has the effect of facilitating the flow of the milled material through 1. The effect of the vibration prevents the material from agglomerating in the openings 4 of the sieve 1 during the grinding operation, thus allowing a continuous flow of the milled material, without human intervention. Indeed, the vibrations generated by the vibration generator 7 are transmitted to the filtering portion of the screen 6 in a very efficient manner. This leads to an acceleration of the circulation of the crushed material, in particular to avoid the risk of stagnation of powdery materials. The one-piece architecture also prevents embrittlement of the sieve by the vibrations exerted when the latter is devoid of bonding areas or welding.

Dans les exemples illustrés aux figures 2 et 3, le générateur de vibrations 7 est couplé à l'anneau connecteur 12 par l'intermédiaire d'un bras conducteur de vibrations 9 et par un adaptateur 8, ou connecteur. La figure 4 est une représentation en perspective du même système de broyage que celui de la figure 3 mais où les éléments internes à l'enceinte de protection 11 sont représentés en dehors de celle-ci, afin de visualiser d'avantage certains éléments fonctionnels de la chaine de vibrations, et notamment l'anneau transmetteur de vibrations 12.In the examples illustrated in figures 2 and 3 , the vibration generator 7 is coupled to the connector ring 12 via a vibration-conducting arm 9 and an adapter 8, or connector. The figure 4 is a perspective representation of the same grinding system as that of the figure 3 but where the internal elements of the protective enclosure 11 are shown outside thereof, in order to further visualize certain functional elements of the vibration chain, and in particular the vibration-transmitting ring 12.

Le couplage du générateur de vibrations 7 au tamis 1 peut être assuré par une autre configuration que celle de l'anneau connecteur 12 illustrée aux figures 2 et 4. Par exemple, le générateur de vibrations 7 peut être couplé directement à la partie support 5 du tamis 1. Dans la figure 3, le générateur de vibrations 7 est couplé au tamis 1 par l'intermédiaire d'un arc 12 disposé à une extrémité du tamis 1 de forme cylindrique.The coupling of the vibration generator 7 to the screen 1 may be provided by a configuration other than that of the connector ring 12 illustrated in FIGS. figures 2 and 4 . For example, the vibration generator 7 can be coupled directly to the support portion 5 of the screen 1. figure 3 , the vibration generator 7 is coupled to the screen 1 via an arc 12 disposed at one end of the sieve 1 of cylindrical shape.

L'enceinte 11 permet non seulement un broyage des matières poudreuses dans un environnement sain et opaque, mais sert également à recueillir les matières poudreuses ayant transité par le tamis monopièce 1. Le système de broyage des matières poudreuses par broyage permet ainsi un traitement de manière continue des matières, sans intervention humaine, grâce à la combinaison entre le tamis monobloc 1 et le dispositif de vibrations 7, 8, 9. Les dimensions de l'enceinte 11 sont également avantageusement définies de façon à prendre en compte le dispositif de vibrations relié au tamis.The enclosure 11 allows not only grinding of the powdery materials in a healthy and opaque environment, but also serves to collect the powdery materials having passed through the sieve 1 piece. The grinding system of the powdery materials by grinding thus allows a treatment of continuous material without human intervention, through the combination between the monobloc sieve 1 and the vibration device 7, 8, 9. The dimensions of the enclosure 11 are also advantageously defined so as to take into account the vibration device connected with a sieve.

Lors d'un procédé de broyage avec le système de tamis 1 comprenant le générateur de vibrations 7, le débit d'écoulement de la matière au travers du tamis peut être jusqu'à 50% supérieur au débit atteint en utilisant un tamis comprenant deux ou plusieurs parties et en absence de vibration exercée sur le tamis. Il y a donc-moins de rétention de matière dans la chambre de broyage améliorant ainsi le rendement de l'opération de broyage. D'autres avantages incluent la température moins élevée générée par l'opération de broyage et une puissance moindre pour faire tourner le rotor pendant l'opération de broyage.In a grinding process with the screen system 1 comprising the vibration generator 7, the flow rate of the material through the screen can be up to 50% greater than the flow rate achieved by using a screen comprising two or more several parts and in the absence of vibration exerted on the sieve. There is therefore less retention of material in the grinding chamber thus improving the yield of the grinding operation. Other advantages include the lower temperature generated by the grinding operation and less power to rotate the rotor during the grinding operation.

Le système de traitement préalablement décrit est avantageusement utilisé dans le cadre d'un procédé de traitement de matières, en particulier de matières poudreuses, avec des étapes impliquant des opérations mécaniques effectuées sur la matière, comme par exemple des opérations de tamisage, de centrifugation, de pesage, de tri, de granulométrie, ou autre opération mécanique. Le procédé convient particulièrement bien aux matières poudreuses, sans exclure d'autres formes de matières, par exemple granuleuses.The treatment system previously described is advantageously used in the context of a process for treating materials, in particular powdery materials, with steps involving mechanical operations carried out on the material, such as, for example, sieving, centrifugation, weighing, sorting, granulometry, or other mechanical operation. The process is particularly suitable for powdery materials, without excluding other forms of material, for example granular.

Les Figures et leurs descriptions faites ci-dessus illustrent l'invention plutôt qu'elles ne la limitent.The figures and their descriptions made above illustrate the invention rather than limiting it.

Les signes de références dans les revendications n'ont aucun caractère limitatif. Les verbes "comprendre" et "comporter" n'excluent pas la présence d'autres éléments que ceux listés dans les revendications. Le mot "un" précédant un élément n'exclue pas la présence d'une pluralité de tels éléments.The reference signs in the claims are not limiting in nature. The verbs "understand" and "include" do not exclude the presence of elements other than those listed in the claims. The word "a" preceding an element does not exclude the presence of a plurality of such elements.

Numéros de référence employés sur les figuresReference numbers used in the figures

11
tamissieve
1010
dispositif de broyagegrinding device
1111
enceintepregnant
1212
anneau connecteurring connector
1313
paroiwall
1414
ensemble rotorrotor assembly
141141
lames de broyagegrinding blades
1616
chambre de broyagegrinding chamber
22
élément monopièceone-piece element
2020
unité d'entrainementtraining unit
44
ouverturesovertures
55
partie supportsupport part
66
partie filtrantefiltering part
77
générateur de vibrationsvibration generator
88
connecteurconnector
99
bras conducteurdriver arm

Claims (8)

Système de tamis (1) pour un dispositif de broyage, comprenant : une partie filtrante (6) à fines ouvertures (4) destinée à coopérer avec un rotor du dispositif de broyage de manière à presser la matière à broyer à travers la partie filtrante (6); une partie support (5) permettant le renforcement de la partie filtrante (6); caractérisé en ce que les deux parties constituent un élément monopièce. Screen system (1) for a grinding device, comprising: a filter portion (6) with fine openings (4) for cooperating with a rotor of the grinding device so as to press the material to be grinded through the filtering part (6); a support portion (5) for reinforcing the filter portion (6); characterized in that the two parts constitute a one-piece element. Le système de tamis (1) selon la revendication 1,
constituant un élément monopièce (2) dans lequel la partie filtrante (6) est venue de matière avec la partie support (5).The sieve system (1) according to claim 1,
constituting a one-piece element (2) in which the filtering part (6) is integral with the support part (5). Le système de tamis (1) selon la revendication 1,
dans lequel l'élément monopièce (2) est en alliage métallique.The sieve system (1) according to claim 1,
wherein the one-piece member (2) is of metal alloy. Le système de tamis selon l'une des revendications 1 à 3,
dans lequel le support est constitué d'une surface pourvue d'une pluralité d'ouvertures (3) chacune pourvue d'une zone de filtration (4) comportant des ouvertures adaptées à cette fonction.The sieve system according to one of claims 1 to 3,
wherein the support consists of a surface provided with a plurality of openings (3) each provided with a filtration zone (4) having openings adapted to this function. Le système de tamis (1) selon l'une des revendications 2 ou 3,
dans lequel l'élément monopièce (2) est obtenu par usinage chimique à l'aide de masques spécifiques.The sieve system (1) according to one of claims 2 or 3,
wherein the one-piece element (2) is obtained by chemical machining using specific masks. Le système de tamis (1) selon la revendication 4,
dans lequel l'usinage chimique est effectué par le placement d'une plaque brute dans un bain chimique sur laquelle sont apposés des masques dimensionnés respectivement pour la partie support (5) et pour la partie filtrante (6).The sieve system (1) according to claim 4,
in which the chemical machining is carried out by placing a raw plate in a chemical bath on which masks are affixed dimensioned respectively for the support portion (5) and the filter portion (6). Le système de tamis (1) selon l'une des revendications 1 à 6,
étant relié par un anneau connecteur (12) à un générateur de vibrations (7) facilitant l'écoulement en continu de matières poudreuses à travers la partie filtrante.The sieve system (1) according to one of claims 1 to 6,
being connected by a connector ring (12) to a vibration generator (7) facilitating the continuous flow of powdery materials through the filtering portion. Dispositif de broyage caractérisé en ce qu'il est composé d'un tamis monopièce (1) selon l'une des revendications 1 à 7.Grinding device characterized in that it is composed of a one-piece sieve (1) according to one of claims 1 to 7.
EP14197012.9A 2014-12-09 2014-12-09 Screen system for a grinding device and grinding device using such a screen system Withdrawn EP3031527A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP14197012.9A EP3031527A1 (en) 2014-12-09 2014-12-09 Screen system for a grinding device and grinding device using such a screen system
PCT/IB2015/059413 WO2016092456A1 (en) 2014-12-09 2015-12-07 Sieve system for a grinding device, and grinding device using this type of sieve system
US15/533,689 US20180207642A1 (en) 2014-12-09 2015-12-07 Sieve system for a grinding device, and grinding device using this type of sieve system
CN201580075699.0A CN107206429A (en) 2014-12-09 2015-12-07 Screen system for lapping device and the lapping device using the screen system

Applications Claiming Priority (1)

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EP14197012.9A EP3031527A1 (en) 2014-12-09 2014-12-09 Screen system for a grinding device and grinding device using such a screen system

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EP3031527A1 true EP3031527A1 (en) 2016-06-15

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US (1) US20180207642A1 (en)
EP (1) EP3031527A1 (en)
CN (1) CN107206429A (en)
WO (1) WO2016092456A1 (en)

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US11642700B2 (en) * 2017-12-01 2023-05-09 Glatt Maschinen- Und Apparatebau Ag Screen apparatus
CN116571314A (en) * 2023-06-28 2023-08-11 广东鸿凯智能科技有限公司 Vibrating screen of direct-drive screen vibrating type grinding machine

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IT201900011376A1 (en) * 2019-07-10 2021-01-10 Itea Spa Process and device for grinding heterogeneous matrices
US11203021B2 (en) 2019-07-22 2021-12-21 Cloudious9 Inc. Herb grinder
WO2021030011A1 (en) * 2019-08-12 2021-02-18 Cloudious9 Inc. Herb grinder
FR3100430B1 (en) 2019-09-05 2022-07-08 Culinari Mundi Process for making food crumbs

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US20180207642A1 (en) 2018-07-26
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