EP3000536A1 - Device for cleaning a screen - Google Patents

Device for cleaning a screen Download PDF

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Publication number
EP3000536A1
EP3000536A1 EP15186397.4A EP15186397A EP3000536A1 EP 3000536 A1 EP3000536 A1 EP 3000536A1 EP 15186397 A EP15186397 A EP 15186397A EP 3000536 A1 EP3000536 A1 EP 3000536A1
Authority
EP
European Patent Office
Prior art keywords
carriage
air
screening
channel
along
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15186397.4A
Other languages
German (de)
French (fr)
Other versions
EP3000536B1 (en
Inventor
Angelo DA SILVA
Steeve DA SILVA
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.)
ALFYMA INDUSTRIE
Original Assignee
ALFYMA INDUSTRIE
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Publication date
Application filed by ALFYMA INDUSTRIE filed Critical ALFYMA INDUSTRIE
Publication of EP3000536A1 publication Critical patent/EP3000536A1/en
Application granted granted Critical
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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
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/55—Cleaning with fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/005—Nozzles or other outlets specially adapted for discharging one or more gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0405—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads
    • B05B13/041—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B5/00—Cleaning by methods involving the use of air flow or gas flow
    • B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
    • 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
    • B07B1/10—Screens in the form of endless moving bands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned

Definitions

  • the present invention relates to a device for cleaning a screen, and a screening installation comprising such a device.
  • Known screening facilities are particularly intended to separate materials, including waste, according to their particle size.
  • trampoline screens In particular, it is known to use trampoline screens.
  • This type of screen consists of a strip comprising several layers of perforated elastic fabric, attached to transverse bars. The bars are subjected to a linear reciprocating movement that alternately tension and relax portions of webs, bouncing the material deposited on the web.
  • the present invention relates to a cleaning device of the aforementioned type, comprising: at least two fixed rails intended to be arranged near the screen, respectively according to a first and a second parallel axes; and a mobile blowing carriage.
  • Said carriage comprises: a frame provided with displacement means along the fixed rails; and blowing nozzles connected to means for supplying compressed air, said nozzles being intended to be oriented towards the screen.
  • the present invention further relates to a screening apparatus, comprising: a band-shaped screening screen substantially disposed along a third axis; a device for moving the screening strip; and a cleaning device as described above; the third axis being arranged parallel to the first and second axes and the carriage of the nozzle nozzles being oriented towards the screening screen.
  • the present invention further relates to a method of operating a screening plant as described above, comprising the steps of: moving the screening strip; then immobilization of the screening strip; then triggering, by said immobilization, the movement of the movable carriage along the fixed rails and the air blowing through the nozzles in the direction of the screening strip.
  • the installation comprises a housing as described above; during the motion of the screening strip, the carriage is received in the housing, and after moving the carriage along the fixed rails, the carriage returns to the housing.
  • the present invention further relates to a screening installation as described above, provided with means for implementing a method as described above.
  • the screening plant 10 of the figure 1 comprises a screen 11 of elastic material, in the form of a band substantially disposed along a first axis 12.
  • a length of the fabric 11 along the axis 12 is about 7 meters.
  • the fabric 11 is part of a trampoline screen.
  • the axis 12 is shown horizontally, however it is possible to arrange the fabric 11 in an inclined manner with respect to the horizontal.
  • the fabric 11 is shown substantially flat. However, the fabric 11 is preferably arranged so as to form waves, especially if said fabric 11 is part of a trampoline effect screen.
  • the screening screen 11 is equipped with a movement device which will be discussed later, so as to alternately tension and relax portions of the fabric.
  • the screening installation 10 comprises a device 13 for cleaning the fabric 11.
  • the device 13 comprises a carriage 15 disposed above the fabric 11.
  • the carriage 15 comprises a frame 16 of substantially elongated shape, perpendicular to the axis 12.
  • the carriage 15 further comprises means 17 for moving along two fixed rails 18, 19.
  • the means 17 are sliding pads.
  • the pads 17 are coated with a low friction film, for example containing PTFE (or Teflon).
  • the displacement of the carriage 15 is for example ensured by traction chains 20, connected to a motorization means which will be mentioned later.
  • the rails 18, 19 of the device 13 are respectively disposed along a second axis 22 and a third axis 23.
  • the axes 22, 23 are arranged parallel to each other and to the first axis 12.
  • the rails 18, 19 are disposed above the fabric 11, on either side of said strip, the axes 22, 23 forming a substantially horizontal plane.
  • a length of the rails is preferably substantially equal to, or slightly greater than, a length of the fabric 11.
  • at least one of the ends of the rails 18, 19 is provided with a housing (not shown) capable of to receive the carriage 15 when the latter is not in operation.
  • the carriage 15 is shown at figure 2 in a cavalier perspective, from a point of view opposite to that of the figure 1 relative to the plane of the axes 22, 23.
  • the frame 16 comprises two conduits 24, 25 substantially aligned along a fourth horizontal axis 26, perpendicular to the second and third axes 22, 23.
  • Each duct 24, 25 communicates with nozzles 28, 29 for blowing, distributed regularly along a length of the duct.
  • each duct 24, 25 is connected to thirteen nozzles 28, 29.
  • a duct 24 or 25 is approximately 1 m along the axis 26 and the nozzles 28 or 29 are spaced apart by approximately 7.5 cm along the conduit.
  • the nozzles used are composed of several parallel channels located in the same plane to form a set called “knife” or “scraper".
  • the multiple air jets exiting each nozzle are straight and have a large impact force at a compressed air pressure of less than 7 bar.
  • the impact range of these jets is less than 180 mm.
  • the conduits 24, 25 and the nozzles 28, 29 are arranged symmetrically with respect to a plane of symmetry of the frame 16, said plane of symmetry being vertical and parallel to the axes 22, 23.
  • the nozzles 28, 29 are oriented towards the screening web 11.
  • a distance between an outlet of the nozzles 28, 29 and the fabric 11 is about 15 cm.
  • the direction of the nozzles is oblique with respect to the first axis 12 in a vertical plane.
  • the direction of the nozzles forms with the first axis 12 an angle of between 30 ° and 90 ° and preferably close to 45 °.
  • the nozzles are oriented forwardly with respect to the direction of movement of the frame 16 along the rails 18, 19. According to one variant, it is possible to orient the nozzles substantially perpendicularly to the axis 12 and to the surface of the canvas 11.
  • the frame 16 carries two collectors 32, 33 of air, positioned laterally on either side of the plane of symmetry of the frame 16.
  • An inlet mouth 36, 37 of each duct 24, 25 is connected to a collector 32, 33.
  • the collector 32 connected to the conduit 24 is particularly visible at the figure 2 .
  • the description below of the collector 32 and the duct 24 also applies to the other collector 33 and to the other duct 25.
  • a side face 40 of the manifold 32 has an air inlet port 41.
  • the orifice 41 has the form of two longitudinal slots, located one above the other and separated by a blade 42.
  • the face 40 of the collector 32 is intended to come into contact with a rail 18, as shown in FIG. figure 1 .
  • the frame 16 is connected to the collector 32 by compression springs 43. Some of the springs 43 are shown in detail at figures 3 and 4 .
  • a similar device connects the frame 16 to the other manifold 33.
  • the duct 24 comprises two vents 36, 44 of air inlet.
  • Each of said mouths connects one end of the manifold 32, along the second axis 22, to one end of the duct 24 along the fourth axis 26.
  • This air supply at each end of the duct 18 facilitates a pressure equalization in the nozzles 28.
  • Each end of the face 40, along the axis 22, is connected to a tab 45, 46.
  • the tabs 45, 46 deviate from the rail 18 and are inclined towards the other rail 19.
  • a tab 45, shown in detail in FIGS. figures 3 and 4 thus forms a ramp 47 oriented obliquely with respect to the lateral face 40 of the manifold 32.
  • the other tab 46 has a similar shape.
  • the rails 18, 19 comprise channels 48, 49 able to transfer compressed air to the collectors 32, 33.
  • the channels 48, 49 are respectively disposed along the second axis 22 and the third axis 23.
  • a channel 48 is visible in FIG. longitudinal section at the figure 3 and in cross-section at the figure 4 .
  • the channels 48, 49 are equipped with valves 50 arranged at regular intervals along the axes 22, 23.
  • a distance 51 ( figure 1 ) between two consecutive valves 50 on a channel 48, 49 is less than a length 52 ( figure 2 ) slots forming the inlet orifice 41 of the collectors 32, 33.
  • a valve 50 of the channel 48 is shown in detail at figures 3 and 4 .
  • the description below of channel 48 also applies to the other channel 49.
  • the valve 50 comprises a helical compression spring 53 located inside the channel 48.
  • the spring 53 is arranged transversely with respect to the axis 22.
  • One end 55 of the spring 53 is integral with a wall of the channel 48.
  • Another movable end of the spring 53 is connected to a plug 56, said plug being also located inside the channel 48.
  • spring 53 plate the cap 56 against an orifice 57 of a wall 58 of the channel 48, so as to obstruct said orifice.
  • An outer face of the wall 58 is intended to come into contact with the lateral face 40 of the collector 32.
  • a ball 60 On the plug 56 is mounted a ball 60.
  • the ball 60 passes through the orifice 57 and forms an outward projection of the channel 48.
  • the ball 60 is rotatable relative to the cap 56, about an axis perpendicular to the second axis 22 and the fourth axis 26. More specifically, the ball is able to roll against the collector 32 when said collector moves according to the axis 22.
  • the spring 53 In the closed position of the valve 50, the spring 53 is in a partially compressed state, so as to exert a force towards the plug 56. A pressure exerted in the opposite direction on the ball 60 and / or the plug 56 increases the compression of the spring 53 and discards the plug 56 of the orifice 57.
  • the inside of the channel 48 In this so-called open position of the valve 50, the inside of the channel 48 is in communication with the outside via the orifice 57. As it will be explained further, the open position allows in particular to transfer compressed air into a manifold 32,33 through the orifice 41 of the collectors.
  • the screening installation 10 further comprises an electronic device 70 for operating the installation, according to a method which will be detailed below.
  • the device 70 is schematically represented at the figure 5 .
  • the device 70 typically comprises a program memory in which is stored a program 71 implementing the various steps of the method.
  • the device 70 is able to actuate a device 72 for moving the screening fabric 11.
  • the device 70 is also able to actuate a motor 73.
  • the motor 73 is for example connected to pinions (not shown) on which the traction chains of the carriage 15 are mounted. The startup of the motor 73 moves the carriage 15 along the rails 18, 19, the pads 17 sliding on the rails.
  • the device 70 is also able to actuate a compressor 75 which sends compressed air into the channels 48, 49.
  • the carriage 15 and the rails 18, 19 are arranged below the fabric 11, the nozzles 28, 29 remaining oriented towards the fabric 11.
  • the installation 10 comprises two cleaning devices, similar to the device 13 described above. More specifically, each cleaning device comprises a carriage 15 and rails 18, 19 as described above. One of said cleaning devices is disposed above the fabric 11 and the other of said cleaning devices is disposed below the fabric 11, the nozzles 28, 29 of each carriage remaining oriented towards said fabric.
  • a screening of materials placed on the fabric 11 is made.
  • the fabric 11 is set in motion by the device 72.
  • the carriage 15 is preferably in a housing located at one end of the rails 18, 19.
  • the device 72 stops working and the fabric 11 stops.
  • the program 71 then performs a unclogging step of the web 11.
  • the compressor 75 is started to supply compressed air to the channels 48, 49.
  • the supply pressure is about 5 bars.
  • the motor 73 is started to move the carriage 15 along the rails 18, 19.
  • the speed of movement of the carriage 15 is 25 mm / s.
  • each of the collectors 32, 33 slides along the wall 58 of each of the channels 48, 49.
  • the oblique ramp 47 gradually pushes the ball 60 towards the inside of the channel 48 or 49.
  • the orifice 57 is thus open when it is opposite the inlet orifice 41 collector air 32 or 33.
  • the distance 51 between two valves 50 is less than the length 52 of the inlet orifice 41 of the collectors 32, 33.
  • said collectors are always in contact with an open orifice 57 and the supply of compressed air nozzles 28, 29 are continuous during the movement of the carriage 15.
  • the carriage 15 travels the entire length of the rails 18, 19 while the nozzles 28, 29 blow jets of compressed air.
  • the supply of compressed air is interrupted and the carriage 15 travels the rails 18, 19 in the opposite direction to reach its housing.
  • the supply of compressed air is maintained during the course of the carriage in the opposite direction, to double the duration of the unclogging step.
  • the program 71 provides several round trips of the carriage 15 on the rails 18, 19 to extend the duration of the unclogging step.
  • each of the carriages 15 operates in a manner similar to that described above.
  • the two carriages 15 move in relation to one another with respect to the fabric 11.
  • the carriages are moved in an offset manner.

Landscapes

  • Cleaning In General (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Un dispositif (13) de nettoyage d'un crible (11), comprenant : - au moins deux rails fixes (18, 19) parallèles, agencés à proximité du crible ; et - un chariot (15) mobile de soufflage ; ledit chariot comprenant : - un châssis (16) muni de moyens (20, 73) de déplacement le long des rails fixes ; et - des buses (28, 29) de soufflage reliées à des moyens (32, 33, 48, 49) d'alimentation en air comprimé, lesdites buses étant orientées vers le crible. Une installation (10) de criblage comprenant un tel dispositif.A device (13) for cleaning a screen (11), comprising: at least two parallel fixed rails (18, 19) arranged near the screen; and - a carriage (15) mobile blowing; said carriage comprising: - a frame (16) provided with means (20, 73) for moving along the fixed rails; and - Blowing nozzles (28, 29) connected to means (32, 33, 48, 49) for supplying compressed air, said nozzles being directed towards the screen. A screening installation (10) comprising such a device.

Description

La présente invention concerne un dispositif de nettoyage d'un crible, ainsi qu'une installation de criblage comportant un tel dispositif.The present invention relates to a device for cleaning a screen, and a screening installation comprising such a device.

Des installations de criblage connues sont notamment destinées à séparer des matériaux, notamment des déchets, en fonction de leur granulométrie.Known screening facilities are particularly intended to separate materials, including waste, according to their particle size.

En particulier, il est connu d'utiliser des cribles à effet trampoline. Ce type de crible est constitué d'une bande comprenant plusieurs couches de toile élastique trouée, attachées à des barres transversales. Les barres sont soumises à un mouvement alternatif linéaire qui tend et détend alternativement des portions de toiles, faisant rebondir les matériaux déposés sur la bande.In particular, it is known to use trampoline screens. This type of screen consists of a strip comprising several layers of perforated elastic fabric, attached to transverse bars. The bars are subjected to a linear reciprocating movement that alternately tension and relax portions of webs, bouncing the material deposited on the web.

Le mouvement des barres déforme les mailles de la toile, évitant le coincement de particules dans les trous. Cependant, dans le cas des installations de tri de déchets ménagers, des fibres longues sont susceptibles de se positionner à cheval entre deux trous, provoquant un encrassement de la toile par colmatage.The movement of the bars distorts the mesh of the canvas, avoiding the jamming of particles in the holes. However, in the case of household waste sorting facilities, long fibers are likely to be positioned astride between two holes, causing clogging of the fabric by clogging.

Il est donc nécessaire de décolmater régulièrement ces cribles afin d'évacuer les fibres longues. Le décolmatage est généralement effectué par brossage manuel, ou par soufflage au moyen d'un appareil à air comprimé manipulé par un opérateur. De telles opérations sont fastidieuses et longues, d'autant plus que les toiles de criblage peuvent mesurer plusieurs mètres.It is therefore necessary to regularly unclog these screens in order to evacuate the long fibers. Unclogging is usually done by manual brushing, or blowing by means of a compressed air apparatus manipulated by an operator. Such operations are tedious and time consuming, especially since screening fabrics can be several meters long.

Il existe donc un besoin d'un dispositif facilitant le décolmatage des cribles, en particulier des cribles à effet trampoline.There is therefore a need for a device facilitating the unclogging of screens, in particular trampoline screens.

A cet effet, la présente invention se rapporte à un dispositif de nettoyage du type précité, comprenant : au moins deux rails fixes destinés à être agencés à proximité du crible, respectivement selon un premier et un deuxième axes parallèles ; et un chariot mobile de soufflage. Ledit chariot comprend : un châssis muni de moyens de déplacement le long des rails fixes ; et des buses de soufflage reliées à des moyens d'alimentation en air comprimé, lesdites buses étant destinées à être orientées vers le crible.To this end, the present invention relates to a cleaning device of the aforementioned type, comprising: at least two fixed rails intended to be arranged near the screen, respectively according to a first and a second parallel axes; and a mobile blowing carriage. Said carriage comprises: a frame provided with displacement means along the fixed rails; and blowing nozzles connected to means for supplying compressed air, said nozzles being intended to be oriented towards the screen.

Suivant d'autres aspects avantageux de l'invention, le dispositif comporte l'une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes les combinaisons techniques possibles :

  • les moyens d'alimentation en air comprimé comprennent : au moins un canal d'alimentation en air, porté par l'un des rails fixes ; un collecteur d'air porté par le châssis et relié aux buses de soufflage ; ledit rail fixe et le châssis comprenant des moyens de passage de l'air comprimé entre le canal d'alimentation et le collecteur d'air ;
  • les moyens de passage de l'air comprimé entre le canal et le collecteur comprennent : un orifice d'entrée porté par le collecteur d'air et disposé en vis-à-vis du canal ; une soupape portée par le canal, ladite soupape étant mobile entre une position fermée et une position ouverte, ladite position ouverte permettant un passage d'air hors du canal ; des moyens de passage de la soupape d'une position fermée à une position ouverte au contact du collecteur d'air, de manière à relier le canal d'alimentation en air à l'orifice d'entrée du collecteur ;
  • le canal comporte une série de soupapes réparties sur une longueur du rail fixe, une distance entre deux soupapes consécutives étant inférieure à une dimension de l'orifice d'entrée selon l'axe du rail.
According to other advantageous aspects of the invention, the device comprises one or more of the following characteristics, taken separately or according to all the possible technical combinations:
  • the means for supplying compressed air comprise: at least one air supply duct, carried by one of the fixed rails; an air manifold carried by the frame and connected to the blowing nozzles; said fixed rail and the frame comprising means for passage of compressed air between the supply channel and the air collector;
  • the means for passage of the compressed air between the channel and the manifold comprise: an inlet port carried by the air collector and disposed opposite the channel; a valve carried by the channel, said valve being movable between a closed position and an open position, said open position allowing an air passage out of the channel; means for passage of the valve from a closed position to an open position in contact with the air manifold, so as to connect the air supply channel to the inlet port of the manifold;
  • the channel comprises a series of valves distributed over a length of the fixed rail, a distance between two consecutive valves being less than a dimension of the inlet orifice along the axis of the rail.

La présente invention se rapporte en outre à une installation de criblage, comprenant : une toile de criblage en forme de bande sensiblement disposée selon un troisième axe ; un dispositif de mise en mouvement de la bande de criblage ; et un dispositif de nettoyage tel que décrit ci-dessus ; le troisième axe étant disposé parallèlement au premier et au deuxième axes et les buses de soufflage du chariot étant orientées vers la toile de criblage.The present invention further relates to a screening apparatus, comprising: a band-shaped screening screen substantially disposed along a third axis; a device for moving the screening strip; and a cleaning device as described above; the third axis being arranged parallel to the first and second axes and the carriage of the nozzle nozzles being oriented towards the screening screen.

Suivant d'autres aspects avantageux de l'invention, l'installation comporte l'une ou plusieurs des caractéristiques suivantes, prises isolément ou suivant toutes les combinaisons techniques possibles :

  • l'installation comprend un logement situé à une extrémité des rails fixes selon le premier et le deuxième axes, ledit logement étant apte à recevoir le chariot.
  • l'installation comprend deux dispositifs de nettoyage tels que décrits ci-dessus, lesdits deux dispositifs étant disposés de part et d'autre de la toile de criblage.
According to other advantageous aspects of the invention, the installation comprises one or more of the following characteristics, taken separately or according to all the possible technical combinations:
  • the installation comprises a housing located at one end of the fixed rails along the first and second axes, said housing being adapted to receive the carriage.
  • the installation comprises two cleaning devices as described above, said two devices being arranged on either side of the screen fabric.

La présente invention se rapporte en outre à un procédé de fonctionnement d'une installation de criblage telle que décrite ci-dessus, comprenant les étapes suivantes : mise en mouvement de la bande de criblage ; puis immobilisation de la bande de criblage ; puis déclenchement, par ladite immobilisation, du déplacement du chariot mobile le long des rails fixes et du soufflage d'air par les buses en direction de la bande de criblage.The present invention further relates to a method of operating a screening plant as described above, comprising the steps of: moving the screening strip; then immobilization of the screening strip; then triggering, by said immobilization, the movement of the movable carriage along the fixed rails and the air blowing through the nozzles in the direction of the screening strip.

Préférentiellement, l'installation comporte un logement tel que décrit ci-dessus ; durant la mise en mouvement de la bande de criblage, le chariot est reçu dans le logement, et à l'issue du déplacement du chariot le long des rails fixes, le chariot retourne dans le logement.Preferably, the installation comprises a housing as described above; during the motion of the screening strip, the carriage is received in the housing, and after moving the carriage along the fixed rails, the carriage returns to the housing.

La présente invention se rapporte en outre à une installation de criblage telle que décrite ci-dessus, munie de moyens de mise en oeuvre d'un procédé tel que décrit ci-dessus.The present invention further relates to a screening installation as described above, provided with means for implementing a method as described above.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins sur lesquels :

  • La figure 1 est une vue en perspective cavalière d'une installation de criblage selon un mode de réalisation de l'invention,
  • La figure 2 est une vue en perspective cavalière, d'un chariot de nettoyage de l'installation de la figure 1,
  • La figure 3 est une vue de détail, en coupe longitudinale, d'un dispositif de l'installation de la figure 1,
  • La figure 4 est une vue partielle, en coupe transversale, du dispositif de la figure 3, et
  • La figure 5 est une représentation schématique d'un dispositif de mise en fonctionnement de l'installation de la figure 1.
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings in which:
  • The figure 1 is a perspective view of a screening installation according to one embodiment of the invention,
  • The figure 2 is a cavalier perspective view, of a cleaning trolley of the installation of the figure 1 ,
  • The figure 3 is a detail view, in longitudinal section, of a device of the installation of the figure 1 ,
  • The figure 4 is a partial view, in cross-section, of the device of the figure 3 , and
  • The figure 5 is a schematic representation of a device for operating the installation of the figure 1 .

L'installation 10 de criblage de la figure 1 comporte une toile 11 de criblage, en matériau élastique, sous la forme d'une bande sensiblement disposée selon un premier axe 12. A titre d'exemple, une longueur de la toile 11 selon l'axe 12 est d'environ 7 mètres. Préférentiellement, la toile 11 fait partie d'un crible à effet trampoline.The screening plant 10 of the figure 1 comprises a screen 11 of elastic material, in the form of a band substantially disposed along a first axis 12. For example, a length of the fabric 11 along the axis 12 is about 7 meters. Preferably, the fabric 11 is part of a trampoline screen.

L'axe 12 est représenté horizontal, cependant il est possible de disposer la toile 11 de manière inclinée par rapport à l'horizontale.The axis 12 is shown horizontally, however it is possible to arrange the fabric 11 in an inclined manner with respect to the horizontal.

Sur la figure 1, la toile 11 est représentée sensiblement plane. Cependant, la toile 11 est préférentiellement disposée de manière à former des vagues, notamment si ladite toile 11 fait partie d'un crible à effet trampoline.On the figure 1 , the fabric 11 is shown substantially flat. However, the fabric 11 is preferably arranged so as to form waves, especially if said fabric 11 is part of a trampoline effect screen.

La toile 11 de criblage est équipée d'un dispositif de mise en mouvement qui sera évoqué plus loin, de manière à alternativement tendre et détendre des portions de toile.The screening screen 11 is equipped with a movement device which will be discussed later, so as to alternately tension and relax portions of the fabric.

L'installation 10 de criblage comporte un dispositif 13 de nettoyage de la toile 11. Le dispositif 13 comporte un chariot 15, disposé au-dessus de la toile 11. Le chariot 15 comporte un châssis 16 de forme sensiblement allongée, perpendiculaire à l'axe 12. Le chariot 15 comporte en outre des moyens 17 de déplacement le long de deux rails 18, 19 fixes. Dans le mode de réalisation décrit ici, les moyens 17 sont des patins de glissement. Préférentiellement, les patins 17 sont revêtus d'un film à faible coefficient de frottement, contenant par exemple du PTFE (ou téflon).The screening installation 10 comprises a device 13 for cleaning the fabric 11. The device 13 comprises a carriage 15 disposed above the fabric 11. The carriage 15 comprises a frame 16 of substantially elongated shape, perpendicular to the axis 12. The carriage 15 further comprises means 17 for moving along two fixed rails 18, 19. In the embodiment described here, the means 17 are sliding pads. Preferably, the pads 17 are coated with a low friction film, for example containing PTFE (or Teflon).

Le déplacement du chariot 15 est par exemple assuré par des chaînes 20 de traction, reliées à un moyen de motorisation qui sera évoqué plus loin.The displacement of the carriage 15 is for example ensured by traction chains 20, connected to a motorization means which will be mentioned later.

Les rails 18, 19 du dispositif 13 sont respectivement disposés selon un deuxième axe 22 et un troisième axe 23. Les axes 22, 23 sont disposés parallèlement l'un à l'autre et au premier axe 12.The rails 18, 19 of the device 13 are respectively disposed along a second axis 22 and a third axis 23. The axes 22, 23 are arranged parallel to each other and to the first axis 12.

Dans l'exemple représenté à la figure 1, les rails 18, 19 sont disposés au-dessus de la toile 11, de part et d'autre de ladite bande, les axes 22, 23 formant un plan sensiblement horizontal.In the example shown in figure 1 , the rails 18, 19 are disposed above the fabric 11, on either side of said strip, the axes 22, 23 forming a substantially horizontal plane.

Une longueur des rails est de préférence sensiblement égale, ou légèrement supérieure, à une longueur de la toile 11. Selon un mode de réalisation, à l'une au moins des extrémités des rails 18, 19 est disposé un logement (non représenté) apte à recevoir le chariot 15 lorsque ce dernier n'est pas en fonctionnement.A length of the rails is preferably substantially equal to, or slightly greater than, a length of the fabric 11. According to one embodiment, at least one of the ends of the rails 18, 19 is provided with a housing (not shown) capable of to receive the carriage 15 when the latter is not in operation.

Le chariot 15 est représenté à la figure 2 en perspective cavalière, d'un point de vue opposé à celui de la figure 1 par rapport au plan des axes 22, 23. Le châssis 16 comporte deux conduits 24, 25 sensiblement alignés selon un quatrième axe 26 horizontal, perpendiculaire aux deuxième et troisième axes 22, 23.The carriage 15 is shown at figure 2 in a cavalier perspective, from a point of view opposite to that of the figure 1 relative to the plane of the axes 22, 23. The frame 16 comprises two conduits 24, 25 substantially aligned along a fourth horizontal axis 26, perpendicular to the second and third axes 22, 23.

Chaque conduit 24, 25 communique avec des buses 28, 29 de soufflage, réparties régulièrement sur une longueur du conduit. Dans le mode de réalisation représenté aux figures 1 et 2, chaque conduit 24, 25 est relié à treize buses 28, 29. A titre d'exemple, un conduit 24 ou 25 mesure environ 1 m selon l'axe 26 et les buses 28 ou 29 sont espacées d'environ 7,5 cm le long du conduit.Each duct 24, 25 communicates with nozzles 28, 29 for blowing, distributed regularly along a length of the duct. In the embodiment shown in figures 1 and 2 each duct 24, 25 is connected to thirteen nozzles 28, 29. For example, a duct 24 or 25 is approximately 1 m along the axis 26 and the nozzles 28 or 29 are spaced apart by approximately 7.5 cm along the conduit.

Préférentiellement, les buses utilisées sont composées de plusieurs canaux parallèles, situés dans un même plan pour former un ensemble dit « couteau » ou « racleur ». Les multiples jets d'air sortant de chaque buse sont rectilignes et ont une force d'impact importante sous une pression d'air comprimée inférieure à 7 bars. Typiquement, la portée d'impact de ces jets est inférieure à 180 mm.Preferably, the nozzles used are composed of several parallel channels located in the same plane to form a set called "knife" or "scraper". The multiple air jets exiting each nozzle are straight and have a large impact force at a compressed air pressure of less than 7 bar. Typically, the impact range of these jets is less than 180 mm.

Les conduits 24, 25 et les buses 28, 29 sont disposés symétriquement par rapport à un plan de symétrie du châssis 16, ledit plan de symétrie étant vertical et parallèle aux axes 22, 23.The conduits 24, 25 and the nozzles 28, 29 are arranged symmetrically with respect to a plane of symmetry of the frame 16, said plane of symmetry being vertical and parallel to the axes 22, 23.

Comme représenté à la figure 1, les buses 28, 29 sont orientées en direction de la toile 11 de criblage. De manière préférentielle, une distance entre une sortie des buses 28, 29 et la toile 11 est d'environ 15 cm. La direction des buses est oblique par rapport au premier axe 12 dans un plan vertical. De préférence, la direction des buses forme avec le premier axe 12 un angle compris entre 30° et 90° et préférentiellement proche de 45°.As represented in figure 1 , the nozzles 28, 29 are oriented towards the screening web 11. Preferably, a distance between an outlet of the nozzles 28, 29 and the fabric 11 is about 15 cm. The direction of the nozzles is oblique with respect to the first axis 12 in a vertical plane. Preferably, the direction of the nozzles forms with the first axis 12 an angle of between 30 ° and 90 ° and preferably close to 45 °.

Préférentiellement, les buses sont orientées vers l'avant par rapport au sens de déplacement du châssis 16 le long des rails 18, 19. Selon une variante, il est possible d'orienter les buses sensiblement perpendiculairement à l'axe 12 et à la surface de la toile 11.Preferably, the nozzles are oriented forwardly with respect to the direction of movement of the frame 16 along the rails 18, 19. According to one variant, it is possible to orient the nozzles substantially perpendicularly to the axis 12 and to the surface of the canvas 11.

Le châssis 16 porte deux collecteurs 32, 33 d'air, positionnés latéralement de part et d'autre du plan de symétrie du châssis 16. Une bouche 36, 37 d'entrée de chaque conduit 24, 25 est reliée à un collecteur 32, 33.The frame 16 carries two collectors 32, 33 of air, positioned laterally on either side of the plane of symmetry of the frame 16. An inlet mouth 36, 37 of each duct 24, 25 is connected to a collector 32, 33.

Le collecteur 32 relié au conduit 24 est notamment visible à la figure 2. La description ci-dessous du collecteur 32 et du conduit 24 s'applique également à l'autre collecteur 33 et à l'autre conduit 25.The collector 32 connected to the conduit 24 is particularly visible at the figure 2 . The description below of the collector 32 and the duct 24 also applies to the other collector 33 and to the other duct 25.

Une face 40 latérale du collecteur 32 comporte un orifice 41 d'entrée d'air. Dans le mode de réalisation représenté à la figure 2, l'orifice 41 a la forme de deux fentes longitudinales, situées l'une au-dessus de l'autre et séparées par une lame 42.A side face 40 of the manifold 32 has an air inlet port 41. In the embodiment shown at figure 2 , the orifice 41 has the form of two longitudinal slots, located one above the other and separated by a blade 42.

La face 40 du collecteur 32 est destinée à venir au contact d'un rail 18, comme représenté à la figure 1. Afin de plaquer la face 40 contre le rail 18, le châssis 16 est relié au collecteur 32 par des ressorts 43 de compression. Certains des ressorts 43 sont représentés en vue détaillée aux figures 3 et 4. Un dispositif similaire relie le châssis 16 à l'autre collecteur 33.The face 40 of the collector 32 is intended to come into contact with a rail 18, as shown in FIG. figure 1 . In order to press the face 40 against the rail 18, the frame 16 is connected to the collector 32 by compression springs 43. Some of the springs 43 are shown in detail at figures 3 and 4 . A similar device connects the frame 16 to the other manifold 33.

Dans l'exemple représenté à la figure 2, le conduit 24 comporte deux bouches 36, 44 d'entrée d'air. Chacune desdites bouches relie une extrémité du collecteur 32, selon le deuxième axe 22, à une extrémité du conduit 24 selon le quatrième axe 26. Cette alimentation en air à chaque extrémité du conduit 18 facilite un équilibrage de pression dans les buses 28.In the example shown in figure 2 , the duct 24 comprises two vents 36, 44 of air inlet. Each of said mouths connects one end of the manifold 32, along the second axis 22, to one end of the duct 24 along the fourth axis 26. This air supply at each end of the duct 18 facilitates a pressure equalization in the nozzles 28.

Chaque extrémité de la face 40, selon l'axe 22, est reliée à une patte 45, 46. Par rapport à la face 40, les pattes 45, 46 s'écartent du rail 18 et sont inclinées en direction de l'autre rail 19. Une patte 45, représentée en vue détaillée aux figures 3 et 4, forme donc une rampe 47 orientée obliquement par rapport à la face 40 latérale du collecteur 32. L'autre patte 46 présente une forme similaire.Each end of the face 40, along the axis 22, is connected to a tab 45, 46. With respect to the face 40, the tabs 45, 46 deviate from the rail 18 and are inclined towards the other rail 19. A tab 45, shown in detail in FIGS. figures 3 and 4 thus forms a ramp 47 oriented obliquely with respect to the lateral face 40 of the manifold 32. The other tab 46 has a similar shape.

Les rails 18, 19 comportent des canaux 48, 49 aptes à transférer de l'air comprimé aux collecteurs 32, 33. Les canaux 48, 49 sont respectivement disposés selon le deuxième axe 22 et le troisième axe 23. Un canal 48 est visible en coupe longitudinale à la figure 3 et en coupe transversale à la figure 4.The rails 18, 19 comprise channels 48, 49 able to transfer compressed air to the collectors 32, 33. The channels 48, 49 are respectively disposed along the second axis 22 and the third axis 23. A channel 48 is visible in FIG. longitudinal section at the figure 3 and in cross-section at the figure 4 .

Les canaux 48, 49 sont équipés de soupapes 50 disposées à intervalles réguliers le long des axes 22, 23. Préférentiellement, une distance 51 (figure 1) entre deux soupapes 50 consécutives sur un canal 48, 49 est inférieure à une longueur 52 (figure 2) des fentes formant l'orifice 41 d'entrée des collecteurs 32, 33.The channels 48, 49 are equipped with valves 50 arranged at regular intervals along the axes 22, 23. Preferably, a distance 51 ( figure 1 ) between two consecutive valves 50 on a channel 48, 49 is less than a length 52 ( figure 2 ) slots forming the inlet orifice 41 of the collectors 32, 33.

Une soupape 50 du canal 48 est représentée en vue détaillée aux figures 3 et 4. La description ci-dessous du canal 48 s'applique également à l'autre canal 49.A valve 50 of the channel 48 is shown in detail at figures 3 and 4 . The description below of channel 48 also applies to the other channel 49.

La soupape 50 comporte un ressort 53 hélicoïdal de compression, situé à l'intérieur du canal 48. Le ressort 53 est disposé transversalement par rapport à l'axe 22.The valve 50 comprises a helical compression spring 53 located inside the channel 48. The spring 53 is arranged transversely with respect to the axis 22.

Une extrémité 55 du ressort 53 est solidaire d'une paroi du canal 48. Une autre extrémité mobile du ressort 53 est reliée à un bouchon 56, ledit bouchon étant également situé à l'intérieur du canal 48. En une position dite fermée de la soupape 50, le ressort 53 plaque le bouchon 56 contre un orifice 57 d'une paroi 58 du canal 48, de manière à obstruer ledit orifice. Une face externe de la paroi 58 est destinée à venir au contact de la face 40 latérale du collecteur 32.One end 55 of the spring 53 is integral with a wall of the channel 48. Another movable end of the spring 53 is connected to a plug 56, said plug being also located inside the channel 48. In a so-called closed position of the valve 50, spring 53 plate the cap 56 against an orifice 57 of a wall 58 of the channel 48, so as to obstruct said orifice. An outer face of the wall 58 is intended to come into contact with the lateral face 40 of the collector 32.

Sur le bouchon 56 est montée une bille 60. Lorsque le bouchon 56 est plaqué contre la paroi 58, la bille 60 traverse l'orifice 57 et forme une saillie vers l'extérieur du canal 48.On the plug 56 is mounted a ball 60. When the plug 56 is pressed against the wall 58, the ball 60 passes through the orifice 57 and forms an outward projection of the channel 48.

La bille 60 est mobile en rotation par rapport au bouchon 56, autour d'un axe perpendiculaire au deuxième axe 22 et au quatrième axe 26. Plus précisément, la bille est apte à rouler contre le collecteur 32 lorsque ledit collecteur se déplace selon l'axe 22.The ball 60 is rotatable relative to the cap 56, about an axis perpendicular to the second axis 22 and the fourth axis 26. More specifically, the ball is able to roll against the collector 32 when said collector moves according to the axis 22.

En position fermée de la soupape 50, le ressort 53 est dans un état partiellement comprimé, de sorte à exercer un effort en direction du bouchon 56. Une pression exercée en direction opposée sur la bille 60 et/ou sur le bouchon 56 augmente la compression du ressort 53 et écarte le bouchon 56 de l'orifice 57. Dans cette position dite ouverte de la soupape 50, l'intérieur du canal 48 est en communication avec l'extérieur par l'intermédiaire de l'orifice 57. Comme il sera explicité plus loin, la position ouverte permet notamment de transférer de l'air comprimé dans un collecteur 32,33 par l'orifice 41 des collecteurs.In the closed position of the valve 50, the spring 53 is in a partially compressed state, so as to exert a force towards the plug 56. A pressure exerted in the opposite direction on the ball 60 and / or the plug 56 increases the compression of the spring 53 and discards the plug 56 of the orifice 57. In this so-called open position of the valve 50, the inside of the channel 48 is in communication with the outside via the orifice 57. As it will be explained further, the open position allows in particular to transfer compressed air into a manifold 32,33 through the orifice 41 of the collectors.

L'installation 10 de criblage comporte en outre un dispositif électronique 70 de mise en fonctionnement de l'installation, selon un procédé qui sera détaillé ci-après. Le dispositif 70 est schématiquement représenté à la figure 5.The screening installation 10 further comprises an electronic device 70 for operating the installation, according to a method which will be detailed below. The device 70 is schematically represented at the figure 5 .

Le dispositif 70 comporte typiquement une mémoire de programme dans laquelle est mémorisé un programme 71 mettant en oeuvre les différentes étapes du procédé.The device 70 typically comprises a program memory in which is stored a program 71 implementing the various steps of the method.

Le dispositif 70 est apte à actionner un dispositif 72 de mise en mouvement de la toile 11 de criblage. Le dispositif 70 est également apte à actionner un moteur 73. Le moteur 73 est par exemple relié à des pignons (non représentés) sur lesquels sont montées les chaînes 20 de traction du chariot 15. La mise en route du moteur 73 déplace le chariot 15 le long des rails 18, 19, les patins 17 glissant sur les rails.The device 70 is able to actuate a device 72 for moving the screening fabric 11. The device 70 is also able to actuate a motor 73. The motor 73 is for example connected to pinions (not shown) on which the traction chains of the carriage 15 are mounted. The startup of the motor 73 moves the carriage 15 along the rails 18, 19, the pads 17 sliding on the rails.

Le dispositif 70 est également apte à actionner un compresseur 75 qui envoie de l'air comprimé dans les canaux 48, 49.The device 70 is also able to actuate a compressor 75 which sends compressed air into the channels 48, 49.

Selon une variante au mode de réalisation décrit ci-dessus, le chariot 15 et les rails 18, 19 sont disposés en dessous de la toile 11, les buses 28, 29 restant orientées vers la toile 11.According to a variant of the embodiment described above, the carriage 15 and the rails 18, 19 are arranged below the fabric 11, the nozzles 28, 29 remaining oriented towards the fabric 11.

Selon une autre variante, l'installation 10 comporte deux dispositifs de nettoyage, semblables au dispositif 13 décrit ci-dessus. Plus précisément, chaque dispositif de nettoyage comprend un chariot 15 et des rails 18, 19 tels que décrits ci-dessus. L'un desdits dispositifs de nettoyage est disposé au-dessus de la toile 11 et l'autre desdits dispositifs de nettoyage est disposé au-dessous de la toile 11, les buses 28, 29 de chaque chariot restant orientées vers ladite toile.According to another variant, the installation 10 comprises two cleaning devices, similar to the device 13 described above. More specifically, each cleaning device comprises a carriage 15 and rails 18, 19 as described above. One of said cleaning devices is disposed above the fabric 11 and the other of said cleaning devices is disposed below the fabric 11, the nozzles 28, 29 of each carriage remaining oriented towards said fabric.

Un procédé de fonctionnement de l'installation 10, représentée à la figure 1, va maintenant être décrit. Les différentes étapes dudit procédé sont exécutées par le programme 71.A method of operating the plant 10, shown in FIG. figure 1 , will now be described. The different steps of said method are executed by the program 71.

Dans une première étape, un criblage de matériaux placés sur la toile 11 est réalisé. La toile 11 est mise en mouvement par le dispositif 72. Durant cette étape, le chariot 15 est préférentiellement dans un logement situé à une extrémité des rails 18, 19.In a first step, a screening of materials placed on the fabric 11 is made. The fabric 11 is set in motion by the device 72. During this step, the carriage 15 is preferably in a housing located at one end of the rails 18, 19.

A la fin de l'étape de criblage, le dispositif 72 cesse de fonctionner et la toile 11 s'immobilise. Le programme 71 exécute alors une étape de décolmatage de la toile 11. Le compresseur 75 est mis en route pour alimenter en air comprimé les canaux 48, 49. De manière préférentielle, la pression d'alimentation est d'environ 5 bars.At the end of the screening step, the device 72 stops working and the fabric 11 stops. The program 71 then performs a unclogging step of the web 11. The compressor 75 is started to supply compressed air to the channels 48, 49. Preferably, the supply pressure is about 5 bars.

Parallèlement, le moteur 73 est mis en route pour déplacer le chariot 15 le long des rails 18, 19. A titre d'exemple, la vitesse de déplacement du chariot 15 est de 25 mm/s.Meanwhile, the motor 73 is started to move the carriage 15 along the rails 18, 19. As an example, the speed of movement of the carriage 15 is 25 mm / s.

La face 40 latérale de chacun des collecteurs 32, 33 coulisse le long de la paroi 58 de chacun des canaux 48, 49. Lorsqu'une patte 45 située à l'avant d'un collecteur arrive au contact d'une bille 60 d'une soupape 50, la rampe 47 oblique enfonce progressivement la bille 60 vers l'intérieur du canal 48 ou 49. L'orifice 57 est ainsi ouvert lorsqu'il se trouve en vis-à-vis de l'orifice 41 d'entrée d'air du collecteur 32 ou 33.The lateral face 40 of each of the collectors 32, 33 slides along the wall 58 of each of the channels 48, 49. When a lug 45 located at the front of a collector comes into contact with a ball 60 of a valve 50, the oblique ramp 47 gradually pushes the ball 60 towards the inside of the channel 48 or 49. The orifice 57 is thus open when it is opposite the inlet orifice 41 collector air 32 or 33.

Le flux d'air comprimé traversant les canaux 48, 49 parvient ainsi aux collecteurs 32, 33. Par les bouches 36, 37, 44 d'entrée, l'air comprimé passe par les conduits 24, 25 et arrive aux buses 28, 29. Les buses 28, 29 projettent ainsi des jets d'air comprimé en direction de la toile 11 afin de décolmater ladite toile.The flow of compressed air passing through the channels 48, 49 thus reaches the collectors 32, 33. By the inlet mouths 36, 37, 44, the compressed air passes through the conduits 24, 25 and reaches the nozzles 28, 29 The nozzles 28, 29 thus project jets of compressed air towards the fabric 11 in order to unclog said fabric.

Durant le passage de la face 40 du collecteur au contact de la soupape 50, la bille 60 roule sur la lame 42 séparant les fentes formant l'orifice 41. La lame 42 maintient ainsi la soupape 50 en position ouverte.During the passage of the face 40 of the manifold in contact with the valve 50, the ball 60 rolls on the blade 42 separating the slots forming the orifice 41. The blade 42 thus holds the valve 50 in the open position.

Lorsqu'une extrémité arrière de la face 40 arrive au niveau de la soupape 50, la bille 60 entre en contact avec la rampe 47 oblique de la patte 46 arrière. L'inclinaison de la rampe 47 relâche progressivement la pression sur le ressort 53, ramenant le bouchon 56 au contact de l'orifice 57. Lorsque le chariot 15 s'écarte de la soupape 50, cette dernière a donc retrouvé une position fermée.When a rear end of the face 40 arrives at the valve 50, the ball 60 comes into contact with the oblique ramp 47 of the rear tab 46. The inclination of the ramp 47 gradually releases the pressure on the spring 53, bringing the plug 56 into contact with the orifice 57. When the carriage 15 deviates from the valve 50, the latter has thus found a closed position.

Préférentiellement, la distance 51 entre deux soupapes 50 est inférieure à la longueur 52 de l'orifice 41 d'entrée des collecteurs 32, 33. Ainsi, lesdits collecteurs sont toujours au contact d'un orifice 57 ouvert et l'alimentation en air comprimé des buses 28, 29 est continue au cours du déplacement du chariot 15.Preferably, the distance 51 between two valves 50 is less than the length 52 of the inlet orifice 41 of the collectors 32, 33. Thus, said collectors are always in contact with an open orifice 57 and the supply of compressed air nozzles 28, 29 are continuous during the movement of the carriage 15.

Durant l'étape de décolmatage, le chariot 15 parcourt toute la longueur des rails 18, 19 tandis que les buses 28, 29 soufflent des jets d'air comprimé. A la fin de l'étape de décolmatage, l'alimentation en air comprimé est interrompue et le chariot 15 parcourt les rails 18, 19 en sens inverse pour rejoindre son logement.During the unclogging step, the carriage 15 travels the entire length of the rails 18, 19 while the nozzles 28, 29 blow jets of compressed air. At the end of the unclogging step, the supply of compressed air is interrupted and the carriage 15 travels the rails 18, 19 in the opposite direction to reach its housing.

Selon une variante, l'alimentation en air comprimé est maintenue durant le parcours du chariot en sens inverse, afin de doubler la durée de l'étape de décolmatage.Alternatively, the supply of compressed air is maintained during the course of the carriage in the opposite direction, to double the duration of the unclogging step.

Selon une autre variante, le programme 71 prévoit plusieurs aller-retours du chariot 15 sur les rails 18, 19 afin de prolonger la durée de l'étape de décolmatage.According to another variant, the program 71 provides several round trips of the carriage 15 on the rails 18, 19 to extend the duration of the unclogging step.

Dans le cas où l'installation 10 comporte deux dispositifs 13 de nettoyage, l'un étant au-dessus et l'autre étant au-dessous de la toile 11, chacun des chariots 15 fonctionne selon un procédé similaire à celui décrit ci-dessus. Selon une première variante, les deux chariots 15 se déplacent en vis-à-vis l'un de l'autre par rapport à la toile 11. Selon une seconde variante, les chariots sont mis en mouvement de manière décalée.In the case where the installation 10 comprises two cleaning devices 13, one being above and the other being below the fabric 11, each of the carriages 15 operates in a manner similar to that described above. . According to a first variant, the two carriages 15 move in relation to one another with respect to the fabric 11. According to a second variant, the carriages are moved in an offset manner.

Claims (10)

Dispositif (13) de nettoyage d'un crible (11), du type comprenant des moyens de soufflage, caractérisé en ce qu'il comporte : - au moins deux rails fixes (18, 19) destinés à être agencés à proximité du crible, respectivement selon un premier et un deuxième axes (22, 23) parallèles ; et - un chariot (15) mobile de soufflage ; ledit chariot comprenant : - un châssis (16) muni de moyens (20, 73) de déplacement le long des rails fixes ; et - des buses (28, 29) de soufflage reliées à des moyens (32, 33, 48, 49) d'alimentation en air comprimé, lesdites buses étant destinées à être orientées vers le crible. Device (13) for cleaning a screen (11), of the type comprising blowing means, characterized in that it comprises: at least two fixed rails (18, 19) intended to be arranged close to the screen, respectively along first and second parallel axes (22, 23); and - a carriage (15) mobile blowing; said carriage comprising: - a frame (16) provided with means (20, 73) for moving along the fixed rails; and - Blowing nozzles (28, 29) connected to means (32, 33, 48, 49) for supplying compressed air, said nozzles being intended to be oriented towards the screen. Dispositif selon la revendication 1, tel que les moyens d'alimentation en air comprimé comprennent : - au moins un canal (48, 49) d'alimentation en air, porté par l'un des rails (18, 19) fixes, - un collecteur (32, 33) d'air porté par le châssis et relié aux buses de soufflage, ledit rail fixe et le châssis comprenant des moyens (41, 50, 57) de passage de l'air comprimé entre le canal d'alimentation et le collecteur d'air.Device according to claim 1, such that the compressed air supply means comprise: at least one air supply channel (48, 49) carried by one of the fixed rails (18, 19), a manifold (32, 33) of air carried by the chassis and connected to the blowing nozzles, said fixed rail and the frame comprising means (41, 50, 57) for the passage of compressed air between the supply channel and the air collector. Dispositif selon la revendication 2, tel que les moyens de passage de l'air comprimé entre le canal et le collecteur comprennent : - un orifice (41) d'entrée porté par le collecteur d'air et disposé en vis-à-vis du canal, - une soupape (50) portée par le canal, ladite soupape étant mobile entre une position fermée et une position ouverte, ladite position ouverte permettant un passage d'air hors du canal, - des moyens (42, 47) de passage de la soupape d'une position fermée à une position ouverte au contact du collecteur d'air, de manière à relier le canal d'alimentation en air à l'orifice d'entrée du collecteur. Device according to claim 2, such that the means for passage of compressed air between the channel and the collector comprise: an inlet orifice (41) carried by the air collector and disposed opposite the channel, a valve (50) carried by the channel, said valve being movable between a closed position and an open position, said open position allowing an air passage out of the channel, means (42, 47) for passage of the valve from a closed position to an open position in contact with the air collector, so as to connect the air supply channel to the inlet orifice of the collector . Dispositif selon la revendication 3, tel que le canal comporte une série de soupapes (50) réparties sur une longueur du rail fixe, une distance (51) entre deux soupapes consécutives étant inférieure à une dimension (52) de l'orifice d'entrée selon l'axe du rail.Device according to claim 3, such that the channel comprises a series of valves (50) distributed over a length of the fixed rail, a distance (51) between two consecutive valves being less than one dimension (52) of the inlet orifice along the axis of the rail. Installation de criblage, comprenant : - une toile (11) de criblage en forme de bande sensiblement disposée selon un troisième axe (12), - un dispositif (72) de mise en mouvement de la bande de criblage, - un dispositif (13) de nettoyage selon l'une des revendications précédentes, le troisième axe étant disposé parallèlement au premier et au deuxième axes (22, 23) et les buses de soufflage du chariot étant orientées vers la toile de criblage.Screening apparatus, comprising: a band-shaped screening screen (11) substantially disposed along a third axis (12), a device (72) for moving the screening strip, - A cleaning device (13) according to one of the preceding claims, the third axis being disposed parallel to the first and second axes (22, 23) and the carriage blowing nozzles being oriented towards the screen fabric. Installation selon la revendication 5, comprenant un logement situé à une extrémité des rails fixes selon le premier et le deuxième axes, ledit logement étant apte à recevoir le chariot.Installation according to claim 5, comprising a housing located at one end of the fixed rails along the first and second axes, said housing being adapted to receive the carriage. Installation selon l'une des revendications 5 à 6, comprenant deux dispositifs (13) de nettoyage selon l'une des revendications 1 à 4, lesdits deux dispositifs étant disposés de part et d'autre de la toile de criblage.Installation according to one of claims 5 to 6, comprising two devices (13) for cleaning according to one of claims 1 to 4, said two devices being arranged on either side of the screen fabric. Procédé de fonctionnement d'une installation de criblage selon l'une des revendications 5 à 7, comprenant les étapes suivantes : - mise en mouvement de la bande de criblage ; puis - immobilisation de la bande de criblage ; puis - déclenchement, par ladite immobilisation, du déplacement du chariot mobile le long des rails fixes et du soufflage d'air par les buses en direction de la bande de criblage. A method of operating a screening plant according to one of claims 5 to 7, comprising the following steps: - moving the screening strip; then immobilization of the screening strip; then - Triggering, by said immobilization, the movement of the movable carriage along the fixed rails and the blowing of air through the nozzles in the direction of the screening strip. Procédé de fonctionnement selon la revendication 8 d'une installation de criblage selon la revendication 7, tel que : - durant la mise en mouvement de la bande de criblage, le chariot est reçu dans le logement, - à l'issue du déplacement du chariot le long des rails fixes, le chariot retourne dans le logement. Operating method according to claim 8 of a screening plant according to claim 7, such that: during the movement of the screening strip, the carriage is received in the housing, - After moving the carriage along the fixed rails, the carriage returns to the housing. Installation selon l'une des revendications 5 à 7, munie de moyens (70, 71) de mise en oeuvre d'un procédé selon l'une des revendications 8 à 9.Installation according to one of claims 5 to 7, provided with means (70, 71) for implementing a method according to one of claims 8 to 9.
EP15186397.4A 2014-09-23 2015-09-23 Device for cleaning a screen Active EP3000536B1 (en)

Applications Claiming Priority (1)

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FR1458972A FR3026029B1 (en) 2014-09-23 2014-09-23 DEVICE FOR CLEANING A SCREEN

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EP3000536A1 true EP3000536A1 (en) 2016-03-30
EP3000536B1 EP3000536B1 (en) 2022-01-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115301546A (en) * 2022-09-07 2022-11-08 南京林业大学 Multi-mode air-blowing type screen cleaning device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113857034A (en) * 2021-10-13 2021-12-31 双牌县丰泰农机设备有限公司 Vibration cleaning sieve

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1269298A (en) * 1960-06-30 1961-08-11 Aussie Mfg Ltd Methods and apparatus for unclogging grain sizing sieves

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1269298A (en) * 1960-06-30 1961-08-11 Aussie Mfg Ltd Methods and apparatus for unclogging grain sizing sieves

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115301546A (en) * 2022-09-07 2022-11-08 南京林业大学 Multi-mode air-blowing type screen cleaning device

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FR3026029B1 (en) 2020-01-31
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