EP2783761A1 - Screen comprising a plurality of stacked plates, and means for vertical spacing of the plates relative to one another - Google Patents

Screen comprising a plurality of stacked plates, and means for vertical spacing of the plates relative to one another Download PDF

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Publication number
EP2783761A1
EP2783761A1 EP14162492.4A EP14162492A EP2783761A1 EP 2783761 A1 EP2783761 A1 EP 2783761A1 EP 14162492 A EP14162492 A EP 14162492A EP 2783761 A1 EP2783761 A1 EP 2783761A1
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EP
European Patent Office
Prior art keywords
trays
screen
tray
plate
support
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.)
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Application number
EP14162492.4A
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German (de)
French (fr)
Inventor
René Brunone
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Individual
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Individual
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Publication date
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Publication of EP2783761A1 publication Critical patent/EP2783761A1/en
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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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—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
    • B07B1/4627—Repairing of screening surfaces
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/02—Fastening means for fastening screens to their frames which do not stretch or sag the screening surfaces
    • 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
    • B07B2201/00—Details applicable to machines for screening using sieves or gratings
    • B07B2201/04—Multiple deck screening devices comprising one or more superimposed screens

Definitions

  • the present invention relates to a screen for sorting aggregates of a granular product according to their respective granulometries, of the type comprising a screen for sorting aggregates of a granular product according to their respective granulometries, comprising a plurality of trays vertically stacked together. on top of the others, at least one of the trays supporting at least one sieve.
  • Sieves are commonly used in the extraction industry to separate the aggregates from an extracted granular product according to their respective particle sizes.
  • each screen comprises a plurality of sieves having different meshes, and the product is passed through the various sieves, from the sieve having the coarsest mesh to the sieve having the finest mesh.
  • the larger aggregates are then harvested at the surface of the first sieve, and the finest aggregates are harvested below the last sieve, for example by means of a hopper.
  • each sieve is generally vibrated by an electric vibrator, such as an unbalanced vibrator.
  • An object of the invention is to provide a screen whose maintenance is facilitated. Another goal is to provide a compact screen.
  • the subject of the invention is a screen of the aforementioned type, in which the screen comprises means for vertically spacing the plates relative to one another, adapted to selectively adjust a vertical distance between each plate of the plurality of trays and at least one other tray of the plurality of trays.
  • the sieve 10, shown on the Figure 1 is intended for sorting aggregates of a granular product according to their respective granulometries.
  • the screen 10 comprises a plurality of trays 12A, 12B, 12C stacked vertically one above the other, said trays 12A, 12B, 12C comprising an upper plate 12A at the top of the stack, a lower plate 12B at the bottom of the stack, and a plurality of intermediate trays 12C between the lower trays 12B and upper 12A.
  • the screen 10 further comprises a frame 16 for supporting the trays 12A, 12B, 12C, a plurality of vibrators 20 for vibrating the trays 12B, 12C, chutes 22 for the recovery of the granular product at the outlet of each tray 12B , 12C, and a hopper 24 for recovering the granular product below the lower tray 12C.
  • the screen 10 comprises members 26 vertically spacing the trays 12A, 12B, 12C relative to each other.
  • each tray 12A, 12B, 12C comprises a rigid frame 30.
  • This frame 30 is formed of two longitudinal members 32 each extending from a rear end 34 to a front end 36 of the plate 12, and each defining a straight edge and a left edge of the plate 12A, 12B, 12C, and a plurality of cross members 38 each connecting a spar 32 to the other.
  • Each beam 32 and each cross member 38 is typically constituted by an aluminum profile.
  • Each spar 32 is inclined relative to the horizontal from the rear to the front. In other words, the rear end of each spar 32 is higher than its front end.
  • the sleepers 38 are evenly distributed between the longitudinal members 32, so that each cross member 38 is equidistant from the cross member 38 disposed immediately forward and the cross member 38 arranged immediately behind.
  • the upper plate 12A and each intermediate plate 12C further comprises a plurality of nozzles 40 for irrigating the granular product, as visible on the Figure 3 .
  • the frame 30 of each of these trays 12A, 12C has an internal pipe 42 for circulating a watering fluid of the granular product, typically water.
  • This duct 42 comprises two fluid inlet ducts 44, each formed in a respective spar 32, and a plurality of ducts 46 for supplying the nozzles 40 with fluid, each formed in a respective crossmember 38.
  • Each supply line 46 is in fluid communication with at least one of the inlet lines 44, through a plurality of orifices 47 formed in each spar 32.
  • a static seal (not shown) is disposed at the interface between the supply line 46 and said inlet pipe 44.
  • Each sprinkler nozzle 40 is formed a cross member 38 of the frame 30. It opens into the supply line 46 formed in the cross member 38, and in a lower outer face 48 of the cross member 38. Thus, it is adapted to project the watering fluid on the granular product flowing on the sieves 14 carried by the tray 12B, 12C located below. It is preferably associated with a deflector 50 for dispersing the irrigation fluid on the granular product. This deflector 50 is oriented towards the rear.
  • the lower plate 12B and each intermediate plate 12C supports a plurality of sieves 14 removable.
  • the sieves 14 of each set of sieves 14 carried by the same plate 12B, 12C are contiguous to each other along the longitudinal direction of the plate 12B, 12C.
  • each sieve 14 comprises a bottom 60 perforated, substantially flat, two side edges 62 each projecting upwards since a lateral end of the bottom 60, and two male members 64, 65 for fixing the sieve 14 to the plate 12B, 12C supporting it.
  • the bottom 60 is made of plastic, for example polyurethane, rigid or flexible, or steel. It has a plurality of through orifices 66 each opening into an upper face and into a lower face of the bottom 60. Each through orifice 66 has a diameter substantially equal to the diameter of each other through hole 66 of the sieve 14. The orifices 66 are distributed regularly on the bottom 60.
  • Each screen 14 has a mesh equal to the mesh of each other sieve 14 supported by the same plate 12B, 12C, and different from the mesh of each sieve 14 supported by each other plate 12B, 12C.
  • each sieve 14 supported by a plate 12B, 12C has a mesh finer than that of each sieve 14 supported by each upper plate 12C, and a mesh coarser than that of each sieve 14 supported by each lower plate 12B, 12C .
  • Each screen 14 is adapted so that when it is fixed to the plate 12B, 12C supporting it, its bottom 60 is inclined relative to the horizontal from the rear to the front. Thus, the granular product, when placed on the sieve 14, will tend to flow towards the front of the sieve 14.
  • Each male member 64, 65 is intended to cooperate with a female member formed in the plate 12B, 12C supporting the screen 14.
  • This female member is, in the example shown, constituted by a space formed between two transverse ribs 67 ( Figure 3 ) each carried by a clean cross member 38 of said plate 12B, 12C, each rib 52 projecting upwardly from an upper outer face 54 of said clean cross member 38.
  • Each male member 64, 65 is constituted by a transverse rib projecting downwards from the lower face of the bottom 60.
  • Each male member 64, 65 has an inner chamber 68 for receiving a gas under pressure for inflating said male member 64, 65.
  • Each male member 64, 65 is preferably of flexible plastic material, typically of flexible polyurethane.
  • a first male member 64 extends along a front edge 70 of the bottom 60, and the other male member 65 extends along a rear edge 72 of the bottom 60.
  • Each male member 64, 65 is preferably, as shown, offset toward the center of the bottom 60 with respect to said edge 70, 72.
  • the male members 64, 65 are arranged so that, when the screen 14 is mounted on the plate 12B, 12C supporting it, the male male member 64 is flush with a rear face of a rib 67 of the female member corresponding, while the male rear member 65 is flush with a front face of the other rib 67 of said female member, as visible on the Figure 3 .
  • each male member 64, 65 is inflated, each male member 64, 56 strongly presses against one of the ribs 67, and the friction forces prevent the screen 14 from being removed from the plate 12B, 12C supporting it.
  • the frame 16 comprises six uprights 80, 82, 84, of which only three are visible on the Figure 1 . These uprights 80, 82, 84 define between them a space 85 for receiving the trays 12A, 12B, 12C, in which are arranged the stack of the trays 12A, 12B, 12C and the hopper 24.
  • Each upright 80, 82, 84 is elongate in the vertical direction Z. It comprises a support member 86, rigid, and a vibration absorber 88, flexible.
  • the support member 86 extends over the entire length of the upright 80, 82, 84. It is typically constituted by a metal section.
  • the vibration absorber 88 is interposed between each support member 86 and the trays 12A, 12B, 12C. It defines a bearing surface against each plate 12. In the example shown, it consists of an inflatable bead, typically polyurethane.
  • a first pair of uprights 80 is disposed in front of the stack of trays 12A, 12B, 12C. Said uprights 80 are aligned transversely with each other, a transverse space being left free between these uprights 80 for the discharge of the granular product out of the trays 12A, 12B, 12C. Each of said uprights 80 bears against a front end of one of the longitudinal members 32 of each plate 12A, 12B, 12C.
  • a second pair of posts 82 transversely frames a front end of the trays 12A, 12B, 12C.
  • a first of the amounts 82 of this pair bears against a front end section of the right spar 32 of each plate 12A, 12B, 12C, and the other upright 82 bears against a front end section of the left spar 32 of each plate 12A, 12B , 12C.
  • a third pair of uprights 84 transversely frames a rear end of the trays 12A, 12B, 12C.
  • a first of the amounts 84 of this pair is in abutment against a rear end section of the right spar 32 of each plate 12A, 12B, 12C, and the other upright 84 bears against a rear end section of the left spar 32 of each plate 12A, 12B , 12C.
  • Each vibrator 20 is attached to a respective plate 12B, 12C via an easy fastening element 90, visible on the Figure 6 .
  • the fastening element 90 comprises a support 92 for the vibrator 20, and a plate 94 secured to the support 92.
  • the fastening element 90 comprises a second support 92 for another vibrator 20.
  • the plate 94 is oriented substantially vertically. It is engaged in a longitudinal groove 96 formed in one of the longitudinal members 32 of the respective plate 12B, 12C.
  • Each support 92 is constituted by a pin protruding transversely to the opposite of the plate 12B, 12C from the plate 94.
  • the vibrator 20 is mounted on one of the supports 92.
  • the spar 32 is clamped between the vibrator 20 and the plate 94, so as to lock the fastener 90 in translation.
  • the vibrators 20 are adapted to each other so that the trays 12B, 12C do not all vibrate at the same frequency.
  • the vibration frequency of each plate 12B, 12C can thus be adjusted so that it is adapted to the size of the aggregates that the sieves 14 supported by the plate 12B, 12C are supposed to separate from the rest of the granular product.
  • the vibrators 20 are adapted so that the vibration frequency of the trays 12B, 12C increases with the fineness of the mesh sieves 14 supported by each plate 12B, 12C.
  • the spacers 26 are adapted to selectively adjust a vertical distance between each plate 12B, 12C and each of the trays 12A, 12C disposed above said plate 12B, 12C.
  • the spacers 26 are adapted to increase said vertical distance relative to a reference vertical distance between said plates 12A, 12B, 12C, that is to say to lower each plate 12B, 12C with respect to trays 12A, 12C arranged above.
  • the spacers 26 comprise, with reference to the Figure 2 , bodies (not shown) of vertical immobilization of each plate 12A, 12C relative to the frame 16, and inflatable members 100, 102 supporting the trays 12A, 12B, 12C.
  • the vertical immobilizing members comprise for example a plurality of pins (not shown), typically made of steel, a plurality of first holes (not shown) for the passage of these pins, formed in the uprights 82 and 84 of the frame 16, and a plurality of second holes (not shown) for receiving these pins, formed in the frames 30 of the trays 12A, 12C, each first hole being arranged to be in line with a second hole in the one of the trays 12A, 12C when said tray 12A, 12C is in a reference position.
  • the screen 10 does not include other means for securing the trays 12A, 12B, 12C to the frame 16, so that the trays 12A, 12B, 12C are normally free in translation in the vertical direction. Z with respect to amounts 80, 82, 84.
  • Each inflatable member 100, 102 defines a support surface of one of the trays 12A, 12B, 12C in the vertical direction Z.
  • Each spar 32 of each plate 12A, 12B, 12C rests on one of these inflatable members 100, 102.
  • Each inflatable member 100, 102 also constitutes a vibration absorption member of the trays 12B, 12C.
  • Each inflatable member 100, 102 is in particular constituted by an inflatable bead elongated in the longitudinal direction.
  • the flexibility of each inflatable member 100, 102 in the transverse direction Y is limited, so that parasitic vibrations are avoided.
  • the inflatable members 100, 102 comprise a plurality of intermediate inflatable support members 100, each interposed between two consecutive trays 12A, 12B, 12C by being in contact with said two trays 12A, 12B, 12C.
  • two intermediate inflatable members 100 are interposed between said trays 12A, 12B, 12C: one between the longitudinal members 32 of said trays 12A, 12B, 12C, and another between the left 32 longitudinal members of said trays 12A, 12B, 12C.
  • each inflatable intermediate member 100 comprises a base 104 secured to a spar 32 of the plate 12A, 12B, 12C below, and an extensible portion 106, integral with the base 104 and defining a support surface of a spar 32 of the top plate 12A, 12B, 12C.
  • the base 104 comprises a T-rib 108, projecting downwards from a bottom face of the base 104, for securing the intermediate inflatable member 100 to the spar 32 of the plate 12A, 12B, 12C from below.
  • This rib T 108 cooperates with a groove 110 formed in said spar 32.
  • the extensible portion 106 defines with the base 104 a chamber 112 for receiving a fluid under pressure for the expansion of the expandable portion 106.
  • the inflatable members 100, 102 also comprise two lower support inflatable members 102, each interposed between the hopper 24 and the lower plate 12B.
  • one of said lower inflatable members 102 is interposed between a right edge 114 of the hopper 24 and the right spar 32 of the plate 12B, and the other lower inflatable member 102 is interposed between a left edge 116 of the hopper 24. and the left spar 32 of the plate 12B.
  • each lower inflatable member 102 comprises a base 120 integral with the right edge 114 or left 116 of the hopper 24, and an extensible portion 122, integral with the base 120 and defining a support surface of a spar 32 of the plate 12 .
  • the base 120 comprises a T-rib 124, projecting downwards from a bottom face of the base 120, for securing the lower inflatable member 102 to the right edge 114 or left 116 of the hopper 24.
  • This rib T 124 cooperates with a groove 126 formed in said flange 114, 116.
  • the extensible portion 122 defines with the base 120 a chamber 128 for receiving a fluid under pressure for the expansion of the expandable portion 122.
  • a method of screen maintenance 10 will now be described, with reference to Figures 1 to 6 .
  • the screen 10 is stopped.
  • the operator controls the stop of the supply of the sieve 10 in granular product, waits until all the product is removed from the sieve 10, then cuts off the supply of irrigation fluid of the nozzles 40, and stops the vibrators 20.
  • the operator departs from the tray 12A, 12C disposed immediately above the plate 12B, 12C on which he wishes to intervene for maintenance.
  • the operator first blocks the plate 12A, 12C disposed immediately above so that it can not descend relative to the frame 16, by engaging each pin in a second hole in said plate 12A, 12C, as well as in the first hole disposed in line with said second hole.
  • the operator deflates all the inflatable support members 100, 102 disposed below the plate 12B, 12C on which it wishes to intervene for maintenance. In doing so, said plate 12B, 12C descends relative to the frame 16, and thus deviates from the plate 12A, 12C disposed immediately above.
  • the operator deflates the inflatable support members 100 integral with the plate 12B, 12C on which it intervenes.
  • the operator then has access to the screens 14 carried by the plate 12B, 12C.
  • each sieve 14 has been repositioned, the operator inflates the male members 64, 65, for example by means of an air compressor connected to the internal chamber 68 of each male member 64, 65.
  • each inflatable support member 100, 102 previously deflated always by means of the air compressor.
  • the operator unblocks the plate 12A, 12C located immediately above the plate 12B, 12C on which it intervened. It can then put the sieve 10 into operation, or perform maintenance of another tray 12B, 12C.
  • the maintenance of the screen 10 is facilitated, and the risk of occupational diseases are reduced, the maintenance operator not having to intervene in a confined space.
  • the screen 10 is compact since all the sorting levels are stacked one above the other. It is not necessary to cascade different screens given the excellent quality of sorting provided by the screen 10, especially because of the different vibration frequencies of a plate 12B, 12C to another.
  • the integration of the pipes 42 to the chassis 30 of the trays 12A, 12C avoids the addition of a specific device, bulky, for watering the granular product.

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  • Combined Means For Separation Of Solids (AREA)

Abstract

The screen (10) has an upper deck (12A), a lower deck (12B), and intermediate decks (12C) vertically stacked one above the other, where one of the lower and intermediate decks bears a sieve. Vertical separation elements (26) are provided to vertically separate the decks from one another, so as to selectively adjusting a vertical distance between each deck and the other decks. The vertical separation elements include an immobilizing element for vertically immobilizing one of the decks relative to a support frame (16) for the decks.

Description

La présente invention concerne un crible pour le triage des granulats d'un produit granuleux selon leurs granulométries respectives, du type comprenant un crible pour le triage des granulats d'un produit granuleux selon leurs granulométries respectives, comprenant une pluralité de plateaux empilés verticalement les uns au-dessus des autres, au moins un des plateaux supportant au moins un tamis.The present invention relates to a screen for sorting aggregates of a granular product according to their respective granulometries, of the type comprising a screen for sorting aggregates of a granular product according to their respective granulometries, comprising a plurality of trays vertically stacked together. on top of the others, at least one of the trays supporting at least one sieve.

Les cribles sont communément utilisés dans l'industrie d'extraction pour séparer les granulats d'un produit granuleux extrait en fonction de leurs granulométries respectives. A cet effet, chaque crible comprend une pluralité de tamis ayant des maillages différents, et le produit est passé au travers des différents tamis, depuis le tamis ayant le maillage le plus grossier jusqu'au tamis ayant le maillage le plus fin. Les granulats les plus gros sont ensuite récoltés en surface du premier tamis, et les granulats les plus fins sont récoltés en-dessous du dernier tamis, par exemple au moyen d'une trémie.Sieves are commonly used in the extraction industry to separate the aggregates from an extracted granular product according to their respective particle sizes. For this purpose, each screen comprises a plurality of sieves having different meshes, and the product is passed through the various sieves, from the sieve having the coarsest mesh to the sieve having the finest mesh. The larger aggregates are then harvested at the surface of the first sieve, and the finest aggregates are harvested below the last sieve, for example by means of a hopper.

Pour favoriser l'écoulement du produit entre deux tamis successifs, ceux-ci sont généralement empilés l'un au-dessus de l'autre.To promote the flow of the product between two successive screens, they are usually stacked one above the other.

Pour favoriser le passage des granulats ayant les granulométries les plus faibles au travers des mailles des tamis, chaque tamis est généralement mis en vibration par un vibrateur électrique, tel qu'un vibrateur à balourds.To promote the passage of aggregates having the smallest particle size through sieve meshes, each sieve is generally vibrated by an electric vibrator, such as an unbalanced vibrator.

Les cribles existant ne donnent cependant pas entière satisfaction. En effet, il est régulièrement nécessaire d'intervenir sur un tamis pour la maintenance du crible. Cette opération est généralement effectuée par un opérateur, qui doit à cet effet s'introduire dans le faible espace vertical séparant deux tamis consécutifs. L'opérateur doit ainsi effectuer la maintenance en étant confiné dans un espace étroit où l'air est le plus souvent saturé en particules fines. Ces conditions d'intervention occasionnent souvent des maladies professionnelles, notamment des maladies respiratoires.Existing screens do not, however, give complete satisfaction. Indeed, it is regularly necessary to intervene on a sieve for the maintenance of the screen. This operation is generally performed by an operator, who must for this purpose enter the small vertical space separating two consecutive sieves. The operator must perform the maintenance by being confined in a narrow space where the air is most often saturated with fine particles. These conditions of intervention often cause occupational diseases, especially respiratory diseases.

Un objectif de l'invention est de proposer un crible dont la maintenance soit facilitée. Un autre objectif est de proposer un crible compact.An object of the invention is to provide a screen whose maintenance is facilitated. Another goal is to provide a compact screen.

A cet effet, l'invention a pour objet un crible du type précité, dans lequel le crible comprend des moyens d'écartement vertical des plateaux les uns par rapport aux autres, adaptés pour ajuster sélectivement une distance verticale entre chaque plateau de la pluralité de plateaux et au moins un autre plateau de la pluralité de plateaux.For this purpose, the subject of the invention is a screen of the aforementioned type, in which the screen comprises means for vertically spacing the plates relative to one another, adapted to selectively adjust a vertical distance between each plate of the plurality of trays and at least one other tray of the plurality of trays.

Selon des modes de réalisation particuliers de l'invention, le crible présente en outre l'une ou plusieurs des caractéristiques suivantes, prise(s) isolément ou suivant toute(s) combinaison(s) techniquement possible(s) :

  • le crible comprend un bâti de support des plateaux, et les moyens d'écartement vertical comprennent des moyens d'immobilisation verticale d'au moins un des plateaux par rapport au bâti, ainsi qu'une pluralité d'organes gonflables de support définissant chacun une surface de support de l'un des plateaux suivant la direction verticale ;
  • chaque organe gonflable de support est constitué par un boudin gonflable, allongé dans une direction d'écoulement du produit le long de chaque plateau ;
  • les organes gonflables de support comprennent au moins un organe gonflable de support intermédiaire, interposé entre deux plateaux consécutifs ;
  • le ou chaque tamis est amovible ;
  • le crible comprend des moyens de solidarisation du ou de chaque tamis au plateau le supportant par déformation d'une partie d'un premier élément parmi le tamis et le plateau ;
  • les moyens de solidarisation comprennent au moins un organe mâle, solidaire du premier élément et présentant une chambre intérieure de réception d'un gaz sous pression pour le gonflage dudit organe mâle, au moins un organe femelle de réception dudit organe mâle, formé dans le deuxième élément parmi le tamis et le plateau, et un dispositif d'injection d'un gaz sous pression dans l'organe mâle ;
  • le crible comprend une pluralité de vibrateurs attachés chacun à un plateau respectif de la pluralité de plateaux pour faire vibrer ledit plateau et adaptés les uns aux autres de façon à faire vibrer au moins un des plateaux à une fréquence différente de la fréquence de vibration de chaque autre plateau ;
  • le crible comprend au moins un organe d'absorption des vibrations, interposé entre deux plateaux consécutifs de la pluralité de plateaux ; et
  • le ou chaque organe d'absorption des vibrations est constitué par un organe gonflable de support intermédiaire ;
  • le crible comprend, pour au moins un des vibrateurs, un élément d'attache facile dudit vibrateur à son plateau respectif, ledit élément d'attache facile comportant un support pour le vibrateur, et une platine, solidaire dudit support et reçue dans une rainure ménagée dans le plateau respectif ;
  • le crible comprend un bâti de support des plateaux, ledit bâti comprenant une pluralité de montants verticaux définissant entre eux un espace de réception des plateaux, les plateaux étant libres en translation suivant la direction verticale par rapport aux montants ;
  • chaque montant présente une surface d'appui contre au moins un des plateaux ;
  • chaque montant comprend un absorbeur de vibrations, définissant la surface d'appui ;
  • au moins un des plateaux comprend un châssis rigide, présentant une canalisation interne de circulation d'un fluide d'arrosage du produit, ledit plateau comprenant en outre au moins une buse de projection du fluide d'arrosage sur le produit, la ou chaque buse étant en communication fluidique avec ladite canalisation interne.
According to particular embodiments of the invention, the screen also has one or more of the following characteristics, taken individually or according to any combination (s) technically possible (s):
  • the screen comprises a support frame of the trays, and the vertical spacing means comprise means for vertically immobilizing at least one of the trays relative to the frame, and a plurality of inflatable support members each defining a support surface of one of the trays in the vertical direction;
  • each inflatable support member is constituted by an inflatable bead, elongated in a flow direction of the product along each plate;
  • the inflatable support members comprise at least one inflatable intermediate support member, interposed between two consecutive trays;
  • the or each sieve is removable;
  • the screen comprises means for securing the or each sieve to the plate supporting it by deformation of a portion of a first element among the sieve and the tray;
  • the securing means comprise at least one male member, integral with the first element and having an inner chamber for receiving a pressurized gas for inflating said male member, at least one female member for receiving said male member, formed in the second one of the sieve and the tray, and a device for injecting a gas under pressure into the male member;
  • the screen comprises a plurality of vibrators each attached to a respective one of the plurality of trays to vibrate said tray and adapted to each other so as to vibrate at least one of the trays at a frequency different from the vibration frequency of each other tray;
  • the screen comprises at least one vibration absorption member interposed between two consecutive trays of the plurality of trays; and
  • the or each vibration absorption member is constituted by an inflatable intermediate support member;
  • the sieve comprises, for at least one of the vibrators, an easy attachment element of said vibrator to its respective tray, said easy attachment element comprising a support for the vibrator, and a plate, integral with said support and received in a groove in the respective tray;
  • the screen comprises a support frame trays, said frame comprising a plurality of vertical uprights defining between them a tray receiving space, the trays being free in translation in the vertical direction relative to the uprights;
  • each upright has a bearing surface against at least one of the trays;
  • each amount includes a vibration absorber, defining the bearing surface;
  • at least one of the trays comprises a rigid frame, having an internal pipe for circulating a fluid of the product, said tray further comprising at least one nozzle for spraying the fluid on the product, the or each nozzle being in fluid communication with said internal pipe.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, parmi lesquels :

  • la Figure 1 est une vue de côté en élévation d'un crible selon l'invention,
  • la Figure 2 est une vue de derrière et en coupe transversale du crible de la Figure 1,
  • la Figure 3 est une vue en coupe longitudinale d'un plateau du crible de la Figure 1,
  • la Figure 4 est une vue de côté en perspective et en coupe longitudinale du crible de la Figure 1,
  • la Figure 5 est une vue en perspective d'un tamis du crible de la Figure 1,
  • la Figure 6 est une vue en perspective d'un détail du crible de la Figure 1,
  • la Figure 7 est une vue d'un détail marqué VII de la Figure 2, et
  • la Figure 8 est une vue d'un détail marqué VIII de la Figure 2.
Other features and advantages of the invention will appear on reading the description which follows, given solely by way of example and with reference to the appended drawings, among which:
  • the Figure 1 is a side view in elevation of a screen according to the invention,
  • the Figure 2 is a back view and cross section of the sieve of the Figure 1 ,
  • the Figure 3 is a longitudinal sectional view of a tray of the sieve of the Figure 1 ,
  • the Figure 4 is a side view in perspective and in longitudinal section of the screen of the Figure 1 ,
  • the Figure 5 is a perspective view of a screen sieve from the Figure 1 ,
  • the Figure 6 is a perspective view of a detail of the sieve of the Figure 1 ,
  • the Figure 7 is a view of a detail marked VII of the Figure 2 , and
  • the Figure 8 is a view of a detail marked VIII of the Figure 2 .

Dans la suite, les termes d'orientation sont à entendre en référence à un repère orthogonal représenté sur les Figures, et dans lequel on distingue :

  • un axe X longitudinal, horizontal, orienté de l'arrière vers l'avant,
  • un axe Y transversal, horizontal, orienté de la droite vers la gauche, et
  • un axe Z vertical, orienté du bas vers le haut.
In the following, the terms of orientation are to be understood with reference to an orthogonal reference mark shown in the figures, and in which there are:
  • a longitudinal X axis, horizontal, oriented from the rear to the front,
  • a transverse Y axis, horizontal, oriented from right to left, and
  • a vertical Z axis, oriented from bottom to top.

Le crible 10, représenté sur la Figure 1, est destiné au triage des granulats d'un produit granuleux selon leurs granulométries respectives. A cet effet, le crible 10 comprend une pluralité de plateaux 12A, 12B, 12C empilés verticalement les uns au-dessus des autres, lesdits plateaux 12A, 12B, 12C comprenant un plateau supérieur 12A au sommet de l'empilement, un plateau inférieur 12B au bas de l'empilement, et une pluralité de plateaux intermédiaires 12C entre les plateaux inférieur 12B et supérieur 12A. Le crible 10 comprend en outre un bâti 16 de support des plateaux 12A, 12B, 12C, une pluralité de vibrateurs 20 pour la mise en vibration des plateaux 12B, 12C, des goulottes 22 pour la récupération du produit granuleux en sortie de chaque plateau 12B, 12C, et une trémie 24 pour la récupération du produit granuleux en-dessous du plateau inférieur 12C. Enfin, le crible 10 comprend des organes 26 d'écartement vertical des plateaux 12A, 12B, 12C les uns par rapport aux autres.The sieve 10, shown on the Figure 1 , is intended for sorting aggregates of a granular product according to their respective granulometries. For this purpose, the screen 10 comprises a plurality of trays 12A, 12B, 12C stacked vertically one above the other, said trays 12A, 12B, 12C comprising an upper plate 12A at the top of the stack, a lower plate 12B at the bottom of the stack, and a plurality of intermediate trays 12C between the lower trays 12B and upper 12A. The screen 10 further comprises a frame 16 for supporting the trays 12A, 12B, 12C, a plurality of vibrators 20 for vibrating the trays 12B, 12C, chutes 22 for the recovery of the granular product at the outlet of each tray 12B , 12C, and a hopper 24 for recovering the granular product below the lower tray 12C. Finally, the screen 10 comprises members 26 vertically spacing the trays 12A, 12B, 12C relative to each other.

En référence aux Figures 1 et 2, chaque plateau 12A, 12B, 12C comprend un châssis rigide 30. Ce châssis 30 est formé de deux longerons 32 s'étendant chacun d'une extrémité arrière 34 à une extrémité avant 36 du plateau 12, et définissant chacun un bord droit et un bord gauche du plateau 12A, 12B, 12C, et d'une pluralité de traverses 38 reliant chacune un longeron 32 à l'autre. Chaque longeron 32 et chaque traverse 38 est typiquement constitué par un profilé en aluminium.With reference to Figures 1 and 2 each tray 12A, 12B, 12C comprises a rigid frame 30. This frame 30 is formed of two longitudinal members 32 each extending from a rear end 34 to a front end 36 of the plate 12, and each defining a straight edge and a left edge of the plate 12A, 12B, 12C, and a plurality of cross members 38 each connecting a spar 32 to the other. Each beam 32 and each cross member 38 is typically constituted by an aluminum profile.

Chaque longeron 32 est incliné par rapport à l'horizontale de l'arrière vers l'avant. En d'autres termes, l'extrémité arrière de chaque longeron 32 est plus haute que son extrémité avant.Each spar 32 is inclined relative to the horizontal from the rear to the front. In other words, the rear end of each spar 32 is higher than its front end.

Les traverses 38 sont régulièrement réparties entre les longerons 32, de sorte que chaque traverse 38 est à équidistance de la traverse 38 disposée immédiatement en avant et de la traverse 38 disposée immédiatement en arrière.The sleepers 38 are evenly distributed between the longitudinal members 32, so that each cross member 38 is equidistant from the cross member 38 disposed immediately forward and the cross member 38 arranged immediately behind.

Le plateau supérieur 12A et chaque plateau intermédiaire 12C comprend en outre une pluralité de buses 40 d'arrosage du produit granuleux, comme visible sur la Figure 3.The upper plate 12A and each intermediate plate 12C further comprises a plurality of nozzles 40 for irrigating the granular product, as visible on the Figure 3 .

En référence aux Figures 2 et 3, le châssis 30 de chacun de ces plateaux 12A, 12C présente une canalisation interne 42 de circulation d'un fluide d'arrosage du produit granuleux, typiquement de l'eau. Cette canalisation 42 comprend deux conduites 44 d'arrivée du fluide, formée chacune dans un longeron 32 respectif, et une pluralité de conduites 46 d'alimentation des buses 40 en fluide, formée chacune dans une traverse 38 respective. Chaque conduite d'alimentation 46 est en communication fluidique avec au moins l'une des conduites d'arrivée 44, grâce à une pluralité d'orifices 47 formés dans chaque longeron 32. Un joint d'étanchéité statique (non représenté) est disposé à l'interface entre la conduite d'alimentation 46 et ladite conduite d'arrivée 44.With reference to Figures 2 and 3 , the frame 30 of each of these trays 12A, 12C has an internal pipe 42 for circulating a watering fluid of the granular product, typically water. This duct 42 comprises two fluid inlet ducts 44, each formed in a respective spar 32, and a plurality of ducts 46 for supplying the nozzles 40 with fluid, each formed in a respective crossmember 38. Each supply line 46 is in fluid communication with at least one of the inlet lines 44, through a plurality of orifices 47 formed in each spar 32. A static seal (not shown) is disposed at the interface between the supply line 46 and said inlet pipe 44.

Chaque buse d'arrosage 40 est formée une traverse 38 du châssis 30. Elle débouche dans la conduite d'alimentation 46 formée dans la traverse 38, et dans une face extérieure inférieure 48 de la traverse 38. Ainsi, elle est adaptée pour projeter le fluide d'arrosage sur le produit granuleux s'écoulant sur les tamis 14 portés par le plateau 12B, 12C situé en-dessous. Elle est de préférence associée à un déflecteur 50 pour disperser le fluide d'arrosage sur le produit granuleux. Ce déflecteur 50 est orienté vers l'arrière.Each sprinkler nozzle 40 is formed a cross member 38 of the frame 30. It opens into the supply line 46 formed in the cross member 38, and in a lower outer face 48 of the cross member 38. Thus, it is adapted to project the watering fluid on the granular product flowing on the sieves 14 carried by the tray 12B, 12C located below. It is preferably associated with a deflector 50 for dispersing the irrigation fluid on the granular product. This deflector 50 is oriented towards the rear.

En référence à la Figure 4, le plateau inférieur 12B et chaque plateau intermédiaire 12C supporte une pluralité de tamis 14 amovibles.With reference to the Figure 4 , the lower plate 12B and each intermediate plate 12C supports a plurality of sieves 14 removable.

Les tamis 14 de chaque ensemble de tamis 14 portés par un même plateau 12B, 12C sont accolés les uns aux autres le long de la direction longitudinale du plateau 12B, 12C.The sieves 14 of each set of sieves 14 carried by the same plate 12B, 12C are contiguous to each other along the longitudinal direction of the plate 12B, 12C.

En référence à la Figure 5, chaque tamis 14 comprend un fond 60 ajouré, sensiblement plat, deux bordures latérales 62 faisant chacune saillie vers le haut depuis une extrémité latérale du fond 60, et deux organes mâles 64, 65 pour la fixation du tamis 14 au plateau 12B, 12C le supportant.With reference to the Figure 5 each sieve 14 comprises a bottom 60 perforated, substantially flat, two side edges 62 each projecting upwards since a lateral end of the bottom 60, and two male members 64, 65 for fixing the sieve 14 to the plate 12B, 12C supporting it.

Le fond 60 est en matière plastique, par exemple en polyuréthane, rigide ou souple, ou en acier. Il présente une pluralité d'orifices traversants 66 débouchant chacun dans une face supérieure et dans une face inférieure du fond 60. Chaque orifice traversant 66 a un diamètre sensiblement égal au diamètre de chaque autre orifice traversant 66 du tamis 14. Les orifices 66 sont répartis régulièrement sur le fond 60.The bottom 60 is made of plastic, for example polyurethane, rigid or flexible, or steel. It has a plurality of through orifices 66 each opening into an upper face and into a lower face of the bottom 60. Each through orifice 66 has a diameter substantially equal to the diameter of each other through hole 66 of the sieve 14. The orifices 66 are distributed regularly on the bottom 60.

Du diamètre de ces orifices 66 dépend ce que l'on appelle un « maillage » du tamis 14. Ce maillage est considéré comme « fin » lorsque les orifices 66 ont un petit diamètre, et comme « grossier » lorsque les orifices 66 ont un grand diamètre.From the diameter of these orifices 66 depends what is called a "mesh" of the sieve 14. This mesh is considered "fine" when the orifices 66 have a small diameter, and as "coarse" when the orifices 66 have a large diameter. diameter.

Chaque tamis 14 a un maillage égal au maillage de chaque autre tamis 14 supporté par le même plateau 12B, 12C, et différent du maillage de chaque tamis 14 supporté par chaque autre plateau 12B, 12C. En particulier, chaque tamis 14 supporté par un plateau 12B, 12C a un maillage plus fin que celui de chaque tamis 14 supporté par chaque plateau 12C supérieur, et un maillage plus grossier que celui de chaque tamis 14 supporté par chaque plateau 12B, 12C inférieur.Each screen 14 has a mesh equal to the mesh of each other sieve 14 supported by the same plate 12B, 12C, and different from the mesh of each sieve 14 supported by each other plate 12B, 12C. In particular, each sieve 14 supported by a plate 12B, 12C has a mesh finer than that of each sieve 14 supported by each upper plate 12C, and a mesh coarser than that of each sieve 14 supported by each lower plate 12B, 12C .

Chaque tamis 14 est adapté pour que, lorsqu'il est fixé au plateau 12B, 12C le supportant, son fond 60 soit incliné par rapport à l'horizontale de l'arrière vers l'avant. Ainsi, le produit granuleux, lorsque posé sur le tamis 14, aura tendance à s'écouler vers l'avant du tamis 14.Each screen 14 is adapted so that when it is fixed to the plate 12B, 12C supporting it, its bottom 60 is inclined relative to the horizontal from the rear to the front. Thus, the granular product, when placed on the sieve 14, will tend to flow towards the front of the sieve 14.

Chaque organe mâle 64, 65 est destiné à coopérer avec un organe femelle formé dans le plateau 12B, 12C supportant le tamis 14. Cet organe femelle est, dans l'exemple représenté, constitué par un espace formé entre deux nervures transversales 67 (Figure 3) portées chacune par une traverse 38 propre dudit plateau 12B, 12C, chaque nervure 52 faisant saillie vers le haut depuis une face extérieure supérieure 54 de ladite traverse propre 38.Each male member 64, 65 is intended to cooperate with a female member formed in the plate 12B, 12C supporting the screen 14. This female member is, in the example shown, constituted by a space formed between two transverse ribs 67 ( Figure 3 ) each carried by a clean cross member 38 of said plate 12B, 12C, each rib 52 projecting upwardly from an upper outer face 54 of said clean cross member 38.

Chaque organe mâle 64, 65 est constitué par une nervure transversale faisant saillie vers le bas depuis la face inférieure du fond 60. Chaque organe mâle 64, 65 présente une chambre intérieure 68 de réception d'un gaz sous pression pour le gonflage dudit organe mâle 64, 65. Chaque organe mâle 64, 65 est de préférence en matière plastique souple, typiquement en polyuréthane souple.Each male member 64, 65 is constituted by a transverse rib projecting downwards from the lower face of the bottom 60. Each male member 64, 65 has an inner chamber 68 for receiving a gas under pressure for inflating said male member 64, 65. Each male member 64, 65 is preferably of flexible plastic material, typically of flexible polyurethane.

Un premier organe mâle 64 s'étend le long d'un bord avant 70 du fond 60, et l'autre organe mâle 65 s'étend le long d'un bord arrière 72 du fond 60. Chaque organe mâle 64, 65 est de préférence, comme représenté, décalé vers le centre du fond 60 par rapport audit bord 70, 72.A first male member 64 extends along a front edge 70 of the bottom 60, and the other male member 65 extends along a rear edge 72 of the bottom 60. Each male member 64, 65 is preferably, as shown, offset toward the center of the bottom 60 with respect to said edge 70, 72.

En particulier, les organes mâles 64, 65 sont disposés de sorte que, lorsque le tamis 14 est monté sur le plateau 12B, 12C le supportant, l'organe mâle avant 64 affleure une face arrière d'une nervure 67 de l'organe femelle correspondant, pendant que l'organe mâle arrière 65 affleure une face avant de l'autre nervure 67 dudit organe femelle, comme visible sur la Figure 3. Ainsi, lorsque chaque organe mâle 64, 65 est gonflé, chaque organe mâle 64, 56 appuie fortement contre l'une des nervures 67, et les forces de frottement empêchent le tamis 14 d'être retiré du plateau 12B, 12C le supportant.In particular, the male members 64, 65 are arranged so that, when the screen 14 is mounted on the plate 12B, 12C supporting it, the male male member 64 is flush with a rear face of a rib 67 of the female member corresponding, while the male rear member 65 is flush with a front face of the other rib 67 of said female member, as visible on the Figure 3 . Thus, when each male member 64, 65 is inflated, each male member 64, 56 strongly presses against one of the ribs 67, and the friction forces prevent the screen 14 from being removed from the plate 12B, 12C supporting it.

De retour à la Figure 1, le bâti 16 comprend six montants 80, 82, 84, dont seuls trois sont visibles sur la Figure 1. Ces montants 80, 82, 84 définissent entre eux un espace 85 de réception des plateaux 12A, 12B, 12C, dans lequel sont disposés l'empilement des plateaux 12A, 12B, 12C et la trémie 24.Back to the Figure 1 , the frame 16 comprises six uprights 80, 82, 84, of which only three are visible on the Figure 1 . These uprights 80, 82, 84 define between them a space 85 for receiving the trays 12A, 12B, 12C, in which are arranged the stack of the trays 12A, 12B, 12C and the hopper 24.

Chaque montant 80, 82, 84 est allongé suivant la direction verticale Z. Il comprend un organe de support 86, rigide, et un absorbeur de vibrations 88, souple.Each upright 80, 82, 84 is elongate in the vertical direction Z. It comprises a support member 86, rigid, and a vibration absorber 88, flexible.

L'organe de support 86 s'étend sur toute la longueur du montant 80, 82, 84. Il est typiquement constitué par un profilé métallique.The support member 86 extends over the entire length of the upright 80, 82, 84. It is typically constituted by a metal section.

L'absorbeur de vibrations 88 est interposé entre chaque organe de support 86 et les plateaux 12A, 12B, 12C. Il définit une surface d'appui contre chaque plateau 12. Dans l'exemple représenté, il est constitué par un boudin gonflable, typiquement en polyuréthane.The vibration absorber 88 is interposed between each support member 86 and the trays 12A, 12B, 12C. It defines a bearing surface against each plate 12. In the example shown, it consists of an inflatable bead, typically polyurethane.

Une première paire de montants 80 est disposée en avant de l'empilement des plateaux 12A, 12B, 12C. Lesdits montants 80 sont alignés transversalement l'un avec l'autre, un espace transversal étant laissé libre entre ces montants 80 pour l'évacuation du produit granuleux hors des plateaux 12A, 12B, 12C. Chacun desdits montants 80 est en appui contre une extrémité avant de l'un des longerons 32 de chaque plateau 12A, 12B, 12C.A first pair of uprights 80 is disposed in front of the stack of trays 12A, 12B, 12C. Said uprights 80 are aligned transversely with each other, a transverse space being left free between these uprights 80 for the discharge of the granular product out of the trays 12A, 12B, 12C. Each of said uprights 80 bears against a front end of one of the longitudinal members 32 of each plate 12A, 12B, 12C.

Une deuxième paire de montants 82 encadre transversalement une extrémité avant des plateaux 12A, 12B, 12C. Un premier des montants 82 de cette paire, visible sur la Figure 1, est en appui contre un tronçon d'extrémité avant du longeron 32 droit de chaque plateau 12A, 12B, 12C, et l'autre montant 82 est en appui contre un tronçon d'extrémité avant du longeron 32 gauche de chaque plateau 12A, 12B, 12C.A second pair of posts 82 transversely frames a front end of the trays 12A, 12B, 12C. A first of the amounts 82 of this pair, visible on the Figure 1 , bears against a front end section of the right spar 32 of each plate 12A, 12B, 12C, and the other upright 82 bears against a front end section of the left spar 32 of each plate 12A, 12B , 12C.

Une troisième paire de montants 84 encadre transversalement une extrémité arrière des plateaux 12A, 12B, 12C. Un premier des montants 84 de cette paire, visible sur la Figure 1, est en appui contre un tronçon d'extrémité arrière du longeron 32 droit de chaque plateau 12A, 12B, 12C, et l'autre montant 84 est en appui contre un tronçon d'extrémité arrière du longeron 32 gauche de chaque plateau 12A, 12B, 12C.A third pair of uprights 84 transversely frames a rear end of the trays 12A, 12B, 12C. A first of the amounts 84 of this pair, visible on the Figure 1 , is in abutment against a rear end section of the right spar 32 of each plate 12A, 12B, 12C, and the other upright 84 bears against a rear end section of the left spar 32 of each plate 12A, 12B , 12C.

Chaque vibrateur 20 est attaché à un plateau 12B, 12C respectif par l'intermédiaire d'un élément d'attache facile 90, visible sur la Figure 6. Comme représenté sur cette Figure, l'élément d'attache 90 comprend un support 92 pour le vibrateur 20, et une platine 94 solidaire du support 92. Dans l'exemple représenté, l'élément d'attache 90 comprend un deuxième support 92 pour un autre vibrateur 20.Each vibrator 20 is attached to a respective plate 12B, 12C via an easy fastening element 90, visible on the Figure 6 . As shown in this Figure, the fastening element 90 comprises a support 92 for the vibrator 20, and a plate 94 secured to the support 92. In the example shown, the fastening element 90 comprises a second support 92 for another vibrator 20.

La platine 94 est orientée sensiblement verticalement. Elle est engagée dans une rainure longitudinale 96 ménagée dans l'un des longerons 32 du plateau respectif 12B, 12C.The plate 94 is oriented substantially vertically. It is engaged in a longitudinal groove 96 formed in one of the longitudinal members 32 of the respective plate 12B, 12C.

Chaque support 92 est constitué par un pion faisant saillie transversalement à l'opposée du plateau 12B, 12C depuis la platine 94.Each support 92 is constituted by a pin protruding transversely to the opposite of the plate 12B, 12C from the plate 94.

Le vibrateur 20 est monté sur l'un des supports 92. Le longeron 32 est pincé entre le vibrateur 20 et la platine 94, de façon à bloquer l'élément d'attache 90 en translation.The vibrator 20 is mounted on one of the supports 92. The spar 32 is clamped between the vibrator 20 and the plate 94, so as to lock the fastener 90 in translation.

De retour à la Figure 1, les vibrateurs 20 sont adaptés les uns aux autres de façon à ce que les plateaux 12B, 12C ne vibrent pas tous à la même fréquence. La fréquence de vibration de chaque plateau 12B, 12C peut ainsi être ajustée de façon à ce qu'elle soit adaptée à la taille des granulats que les tamis 14 supportés par le plateau 12B, 12C sont supposés séparer du reste du produit granuleux. En particulier, les vibrateurs 20 sont adaptés pour que la fréquence de vibration des plateaux 12B, 12C aille croissante avec la finesse du maillage des tamis 14 supportés par chaque plateau 12B, 12C.Back to the Figure 1 the vibrators 20 are adapted to each other so that the trays 12B, 12C do not all vibrate at the same frequency. The vibration frequency of each plate 12B, 12C can thus be adjusted so that it is adapted to the size of the aggregates that the sieves 14 supported by the plate 12B, 12C are supposed to separate from the rest of the granular product. In particular, the vibrators 20 are adapted so that the vibration frequency of the trays 12B, 12C increases with the fineness of the mesh sieves 14 supported by each plate 12B, 12C.

A cet effet, dans l'exemple représenté, seuls quatre vibrateurs 20 sont attachés au premier plateau intermédiaire 12C, huit vibrateurs 20 sont attachés à chacun des deux plateaux intermédiaires 12C venant ensuite, et douze vibrateurs 20 sont attachés au plateau inférieur 12B.For this purpose, in the example shown, only four vibrators 20 are attached to the first intermediate plate 12C, eight vibrators 20 are attached to each of the two intermediate trays 12C next, and twelve vibrators 20 are attached to the lower plate 12B.

Les organes d'écartement 26 sont adaptés pour ajuster sélectivement une distance verticale entre chaque plateau 12B, 12C et chacun des plateaux 12A, 12C disposés au-dessus dudit plateau 12B, 12C. En particulier, les organes d'écartement 26 sont adaptés pour augmenter ladite distance verticale par rapport à une distance verticale de référence entre lesdits plateaux 12A, 12B, 12C, c'est-à-dire pour abaisser chaque plateau 12B, 12C par rapport aux plateaux 12A, 12C disposés au-dessus.The spacers 26 are adapted to selectively adjust a vertical distance between each plate 12B, 12C and each of the trays 12A, 12C disposed above said plate 12B, 12C. In particular, the spacers 26 are adapted to increase said vertical distance relative to a reference vertical distance between said plates 12A, 12B, 12C, that is to say to lower each plate 12B, 12C with respect to trays 12A, 12C arranged above.

A cet effet, les organes d'écartement 26 comprennent, en référence à la Figure 2, des organes (non représentés) d'immobilisation verticale de chaque plateau 12A, 12C par rapport au bâti 16, et des organes gonflables 100, 102 de support des plateaux 12A, 12B, 12C.For this purpose, the spacers 26 comprise, with reference to the Figure 2 , bodies (not shown) of vertical immobilization of each plate 12A, 12C relative to the frame 16, and inflatable members 100, 102 supporting the trays 12A, 12B, 12C.

Les organes d'immobilisation verticale comprennent par exemple une pluralité de broches (non représentées), typiquement en acier, une pluralité de premiers trous (non représentés) pour le passage de ces broches, ménagés dans les montants 82 et 84 du bâti 16, et une pluralité de deuxièmes trous (non représentés) pour la réception de ces broches, ménagés dans les châssis 30 des plateaux 12A, 12C, chaque premier trou étant disposé de façon à être au droit d'un deuxième trou ménagé dans l'un des plateaux 12A, 12C lorsque ledit plateau 12A, 12C est dans une position de référence. Hormis ces organes d'immobilisation verticale, le crible 10 ne comprend pas d'autres moyens de solidarisation des plateaux 12A, 12B, 12C au bâti 16, de sorte que les plateaux 12A, 12B, 12C sont normalement libres en translation suivant la direction verticale Z par rapport aux montants 80, 82, 84.The vertical immobilizing members comprise for example a plurality of pins (not shown), typically made of steel, a plurality of first holes (not shown) for the passage of these pins, formed in the uprights 82 and 84 of the frame 16, and a plurality of second holes (not shown) for receiving these pins, formed in the frames 30 of the trays 12A, 12C, each first hole being arranged to be in line with a second hole in the one of the trays 12A, 12C when said tray 12A, 12C is in a reference position. Apart from these vertical immobilizing members, the screen 10 does not include other means for securing the trays 12A, 12B, 12C to the frame 16, so that the trays 12A, 12B, 12C are normally free in translation in the vertical direction. Z with respect to amounts 80, 82, 84.

Chaque organe gonflable 100, 102 définit une surface de support de l'un des plateaux 12A, 12B, 12C suivant la direction verticale Z. Chaque longeron 32 de chaque plateau 12A, 12B, 12C repose sur l'un de ces organes gonflables 100, 102.Each inflatable member 100, 102 defines a support surface of one of the trays 12A, 12B, 12C in the vertical direction Z. Each spar 32 of each plate 12A, 12B, 12C rests on one of these inflatable members 100, 102.

Chaque organe gonflable 100, 102 constitue également un organe d'absorption des vibrations des plateaux 12B, 12C.Each inflatable member 100, 102 also constitutes a vibration absorption member of the trays 12B, 12C.

Chaque organe gonflable 100, 102 est en particulier constitué par un boudin gonflable allongé dans la direction longitudinale. Ainsi, la souplesse de chaque organe gonflable 100, 102 suivant la direction transversale Y est limitée, de sorte que les vibrations parasites sont évitées.Each inflatable member 100, 102 is in particular constituted by an inflatable bead elongated in the longitudinal direction. Thus, the flexibility of each inflatable member 100, 102 in the transverse direction Y is limited, so that parasitic vibrations are avoided.

Les organes gonflables 100, 102 comprennent une pluralité d'organes gonflables de support intermédiaires 100, chacun interposé entre deux plateaux 12A, 12B, 12C consécutifs en étant en contact avec lesdits deux plateaux 12A, 12B, 12C. En particulier, pour chaque paire de plateaux 12A, 12B, 12C consécutifs, deux organes gonflables intermédiaires 100 sont interposés entre lesdits plateaux 12A, 12B, 12C : l'un entre les longerons 32 droits desdits plateaux 12A, 12B, 12C, et l'autre entre les longerons 32 gauches desdits plateaux 12A, 12B, 12C.The inflatable members 100, 102 comprise a plurality of intermediate inflatable support members 100, each interposed between two consecutive trays 12A, 12B, 12C by being in contact with said two trays 12A, 12B, 12C. In particular, for each pair of trays 12A, 12B, 12C consecutive, two intermediate inflatable members 100 are interposed between said trays 12A, 12B, 12C: one between the longitudinal members 32 of said trays 12A, 12B, 12C, and another between the left 32 longitudinal members of said trays 12A, 12B, 12C.

En référence à la Figure 7, chaque organe gonflable intermédiaire 100 comprend une base 104 solidaire d'un longeron 32 du plateau 12A, 12B, 12C du dessous, et une partie extensible 106, venue de matière avec la base 104 et définissant une surface de support d'un longeron 32 du plateau 12A, 12B, 12C du dessus.With reference to the Figure 7 each inflatable intermediate member 100 comprises a base 104 secured to a spar 32 of the plate 12A, 12B, 12C below, and an extensible portion 106, integral with the base 104 and defining a support surface of a spar 32 of the top plate 12A, 12B, 12C.

La base 104 comprend une nervure en T 108, faisant saillie vers le bas depuis une face inférieure de la base 104, pour la solidarisation de l'organe gonflable intermédiaire 100 au longeron 32 du plateau 12A, 12B, 12C du dessous. Cette nervure en T 108 coopère avec une rainure 110 formée dans ledit longeron 32.The base 104 comprises a T-rib 108, projecting downwards from a bottom face of the base 104, for securing the intermediate inflatable member 100 to the spar 32 of the plate 12A, 12B, 12C from below. This rib T 108 cooperates with a groove 110 formed in said spar 32.

La partie extensible 106 définit avec la base 104 une chambre 112 de réception d'un fluide sous pression pour la dilatation de la partie extensible 106.The extensible portion 106 defines with the base 104 a chamber 112 for receiving a fluid under pressure for the expansion of the expandable portion 106.

De retour à la Figure 2, les organes gonflables 100, 102 comprennent également deux organes gonflables de support inférieur 102, interposés chacun entre la trémie 24 et le plateau inférieur 12B. En particulier, l'un desdits organes gonflables inférieurs 102 est interposé entre un rebord droit 114 de la trémie 24 et le longeron 32 droit du plateau 12B, et l'autre organe gonflable inférieur 102 est interposé entre un rebord gauche 116 de la trémie 24 et le longeron 32 gauche du plateau 12B.Back to the Figure 2 the inflatable members 100, 102 also comprise two lower support inflatable members 102, each interposed between the hopper 24 and the lower plate 12B. In particular, one of said lower inflatable members 102 is interposed between a right edge 114 of the hopper 24 and the right spar 32 of the plate 12B, and the other lower inflatable member 102 is interposed between a left edge 116 of the hopper 24. and the left spar 32 of the plate 12B.

En référence à la Figure 8, chaque organe gonflable inférieur 102 comprend une base 120 solidaire du rebord droit 114 ou gauche 116 de la trémie 24, et une partie extensible 122, venue de matière avec la base 120 et définissant une surface de support d'un longeron 32 du plateau 12.With reference to the Figure 8 , each lower inflatable member 102 comprises a base 120 integral with the right edge 114 or left 116 of the hopper 24, and an extensible portion 122, integral with the base 120 and defining a support surface of a spar 32 of the plate 12 .

La base 120 comprend une nervure en T 124, faisant saillie vers le bas depuis une face inférieure de la base 120, pour la solidarisation de l'organe gonflable inférieur 102 au rebord droit 114 ou gauche 116 de la trémie 24. Cette nervure en T 124 coopère avec une rainure 126 formée dans ledit rebord 114, 116.The base 120 comprises a T-rib 124, projecting downwards from a bottom face of the base 120, for securing the lower inflatable member 102 to the right edge 114 or left 116 of the hopper 24. This rib T 124 cooperates with a groove 126 formed in said flange 114, 116.

La partie extensible 122 définit avec la base 120 une chambre 128 de réception d'un fluide sous pression pour la dilatation de la partie extensible 122.The extensible portion 122 defines with the base 120 a chamber 128 for receiving a fluid under pressure for the expansion of the expandable portion 122.

Un procédé de maintenance du crible 10 va maintenant être décrit, en référence aux Figures 1 à 6.A method of screen maintenance 10 will now be described, with reference to Figures 1 to 6 .

Tout d'abord, le crible 10 est arrêté. A cet effet, l'opérateur commande l'arrêt de l'alimentation du crible 10 en produit granuleux, attend que tout le produit soit évacué du crible 10, puis coupe l'alimentation en fluide d'arrosage des buses 40, et stoppe les vibrateurs 20.First, the screen 10 is stopped. For this purpose, the operator controls the stop of the supply of the sieve 10 in granular product, waits until all the product is removed from the sieve 10, then cuts off the supply of irrigation fluid of the nozzles 40, and stops the vibrators 20.

Puis l'opérateur écarte du plateau 12A, 12C disposé immédiatement au-dessus le plateau 12B, 12C sur lequel il souhaite intervenir pour la maintenance. A cet effet, l'opérateur bloque tout d'abord le plateau 12A, 12C disposé immédiatement au-dessus pour qu'il ne puisse pas descendre par rapport au bâti 16, en engageant chaque broche dans un deuxième trou ménagé dans ledit plateau 12A, 12C, ainsi que dans le premier trou disposé au droit dudit deuxième trou. Ensuite, l'opérateur dégonfle tous les organes gonflables de support 100, 102 disposés en-dessous du plateau 12B, 12C sur lequel il souhaite intervenir pour la maintenance. Ce faisant, ledit plateau 12B, 12C descend par rapport au bâti 16, et s'écarte ainsi du plateau 12A, 12C disposé immédiatement au-dessus.Then the operator departs from the tray 12A, 12C disposed immediately above the plate 12B, 12C on which he wishes to intervene for maintenance. For this purpose, the operator first blocks the plate 12A, 12C disposed immediately above so that it can not descend relative to the frame 16, by engaging each pin in a second hole in said plate 12A, 12C, as well as in the first hole disposed in line with said second hole. Then, the operator deflates all the inflatable support members 100, 102 disposed below the plate 12B, 12C on which it wishes to intervene for maintenance. In doing so, said plate 12B, 12C descends relative to the frame 16, and thus deviates from the plate 12A, 12C disposed immediately above.

A l'étape suivante, l'opérateur dégonfle les organes gonflables de support 100 solidaires du plateau 12B, 12C sur lequel il intervient. L'opérateur a alors accès aux tamis 14 portés par le plateau 12B, 12C.In the next step, the operator deflates the inflatable support members 100 integral with the plate 12B, 12C on which it intervenes. The operator then has access to the screens 14 carried by the plate 12B, 12C.

L'opérateur désolidarise ensuite les tamis 14 du plateau 12B, 12C. A cet effet, il dégonfle les organes mâles 64, 65 de chaque tamis 14.The operator then disconnects the sieves 14 from the plate 12B, 12C. For this purpose, it deflates the male members 64, 65 of each sieve 14.

Puis il retire chaque tamis 14 du plateau 12B, 12C, le nettoie à distance du crible 10, avant de le replacer sur le plateau 12B, 12C.Then he removes each sieve 14 from the tray 12B, 12C, cleans it away from the sieve 10, before putting it back on the tray 12B, 12C.

Une fois chaque tamis 14 replacé, l'opérateur regonfle les organes mâles 64, 65, par exemple au moyen d'un compresseur à air branché à la chambre interne 68 de chaque organe mâle 64, 65.Once each sieve 14 has been repositioned, the operator inflates the male members 64, 65, for example by means of an air compressor connected to the internal chamber 68 of each male member 64, 65.

L'opérateur regonfle ensuite chaque organe gonflable de support 100, 102 préalablement dégonflé, toujours au moyen du compresseur air.The operator then inflates each inflatable support member 100, 102 previously deflated, always by means of the air compressor.

Enfin, l'opérateur débloque le plateau 12A, 12C situé immédiatement au-dessus du plateau 12B, 12C sur lequel il est intervenu. Il peut alors remettre le crible 10 en fonctionnement, ou effectuer la maintenance d'un autre plateau 12B, 12C.Finally, the operator unblocks the plate 12A, 12C located immediately above the plate 12B, 12C on which it intervened. It can then put the sieve 10 into operation, or perform maintenance of another tray 12B, 12C.

Grâce à l'invention décrite ci-dessus, la maintenance du crible 10 est facilitée, et les risques de maladies professionnelles sont réduits, l'opérateur de maintenance ne devant plus intervenir dans un espace confiné.With the invention described above, the maintenance of the screen 10 is facilitated, and the risk of occupational diseases are reduced, the maintenance operator not having to intervene in a confined space.

En outre, le crible 10 est compact puisque tous les niveaux de triage sont empilés les uns au-dessus des autres. Il n'est pas nécessaire de mettre différents cribles en cascade compte-tenu de l'excellente qualité de triage procurée par le crible 10, notamment du fait des fréquences de vibration différentes d'un plateau 12B, 12C à l'autre. De plus, l'intégration des canalisations 42 aux châssis 30 des plateaux 12A, 12C évite l'adjonction d'un dispositif spécifique, encombrant, pour l'arrosage du produit granuleux.In addition, the screen 10 is compact since all the sorting levels are stacked one above the other. It is not necessary to cascade different screens given the excellent quality of sorting provided by the screen 10, especially because of the different vibration frequencies of a plate 12B, 12C to another. In addition, the integration of the pipes 42 to the chassis 30 of the trays 12A, 12C avoids the addition of a specific device, bulky, for watering the granular product.

Claims (15)

Crible (10) pour le triage des granulats d'un produit granuleux selon leurs granulométries respectives, comprenant une pluralité de plateaux (12A, 12B, 12C) empilés verticalement les uns au-dessus des autres, au moins un des plateaux (12B, 12C) supportant au moins un tamis (14),
caractérisé en ce que le crible (10) comprend des moyens (26) d'écartement vertical des plateaux (12A, 12B, 12C) les uns par rapport aux autres, adaptés pour ajuster sélectivement une distance verticale entre chaque plateau (12A, 12B, 12C) de la pluralité de plateaux et au moins un autre plateau (12A, 12B, 12C) de la pluralité de plateaux.Screen (10) for sorting aggregates of a granular product according to their respective grain sizes, comprising a plurality of trays (12A, 12B, 12C) stacked vertically one above the other, at least one of the trays (12B, 12C) ) supporting at least one screen (14),
characterized in that the screen (10) comprises means (26) for vertically spacing the trays (12A, 12B, 12C) relative to each other, adapted to selectively adjust a vertical distance between each tray (12A, 12B, 12C) of the plurality of trays and at least one other tray (12A, 12B, 12C) of the plurality of trays. Crible (10) selon la revendication 1, comprenant un bâti (16) de support des plateaux (12A, 12B, 12C), et dans lequel les moyens d'écartement vertical (26) comprennent des moyens d'immobilisation verticale d'au moins un des plateaux (12A, 12B, 12C) par rapport au bâti (16), ainsi qu'une pluralité d'organes gonflables de support (100, 102) définissant chacun une surface de support de l'un des plateaux (12A, 12B, 12C) suivant la direction verticale.A screen (10) according to claim 1, comprising a tray support frame (16) (12A, 12B, 12C), and wherein the vertical spacing means (26) comprises vertical immobilization means of at least one of the trays (12A, 12B, 12C) relative to the frame (16), and a plurality of inflatable support members (100, 102) each defining a support surface of one of the trays (12A, 12B , 12C) in the vertical direction. Crible (10) selon la revendication 2, dans lequel chaque organe gonflable de support (100, 102) est constitué par un boudin gonflable, allongé dans une direction d'écoulement du produit le long de chaque plateau (12A, 12B, 12C).The screen (10) of claim 2, wherein each inflatable support member (100, 102) is an inflatable bead, elongated in a flow direction of the product along each tray (12A, 12B, 12C). Crible (10) selon la revendication 2 ou 3, dans lequel les organes gonflables de support (100, 102) comprennent au moins un organe gonflable de support intermédiaire (100), interposé entre deux plateaux (12A, 12B, 12C) consécutifs en étant en contact avec lesdits deux plateaux (12A, 12B, 12C).Screen (10) according to claim 2 or 3, wherein the inflatable support members (100, 102) comprise at least one inflatable intermediate support member (100) interposed between two consecutive trays (12A, 12B, 12C) while being in contact with said two trays (12A, 12B, 12C). Crible (10) selon l'une quelconque des revendications précédentes, dans lequel le ou chaque tamis (14) est amovible.Screen (10) according to any one of the preceding claims, wherein the or each screen (14) is removable. Crible (10) selon la revendication 5, comprenant des moyens de solidarisation du ou de chaque tamis (14) au plateau (12B, 12C) le supportant par déformation d'une partie d'un premier élément parmi le tamis (14) et le plateau (12B, 12C).Screen (10) according to claim 5, comprising means for securing the or each sieve (14) to the plate (12B, 12C) supporting it by deformation of a portion of a first element among the sieve (14) and the tray (12B, 12C). Crible (14) selon la revendication 6, dans lequel les moyens de solidarisation comprennent au moins un organe mâle (64, 65), solidaire du premier élément et présentant une chambre intérieure (68) de réception d'un gaz sous pression pour le gonflage dudit organe mâle (64, 65), au moins un organe femelle de réception dudit organe mâle (64, 65), formé dans le deuxième élément parmi le tamis (14) et le plateau (12B, 12C), et un dispositif d'injection d'un gaz sous pression dans l'organe mâle (64, 65).Screen (14) according to claim 6, wherein the securing means comprise at least one male member (64, 65) integral with the first element and having an inner chamber (68) for receiving a gas under pressure for inflation. said male member (64, 65), at least one female receiving member of said male member (64, 65), formed in the second one of the sieve (14) and the tray (12B, 12C), and a device injecting a gas under pressure into the male member (64, 65). Crible (10) selon l'une quelconque des revendications précédentes, comprenant une pluralité de vibrateurs (20), attachés chacun à un plateau (12B, 12C) respectif de la pluralité de plateaux (12A, 12B, 12C) pour faire vibrer ledit plateau (12B, 12C), et adaptés les uns aux autres de façon à faire vibrer au moins un des plateaux (12B, 12C) à une fréquence différente de la fréquence de vibration de chaque autre plateau (12B, 12C).A screen (10) according to any one of the preceding claims comprising a plurality of vibrators (20), each attached to a tray (12B, 12C) respective of the plurality of trays (12A, 12B, 12C) to vibrate said tray (12B, 12C), and adapted to each other so as to vibrate at least one of the trays (12B, 12C) at a frequency different from the vibration frequency of each other tray (12B, 12C). Crible (10) selon la revendication 8, comprenant au moins un organe d'absorption des vibrations, interposé entre deux plateaux (12A, 12B, 12C) consécutifs de la pluralité de plateaux.The screen (10) of claim 8 including at least one vibration absorbing member interposed between two consecutive trays (12A, 12B, 12C) of the plurality of trays. Crible (10) selon les revendications 4 et 9 prises ensemble, dans lequel le ou chaque organe d'absorption des vibrations est constitué par un organe gonflable de support intermédiaire (100).Screen (10) according to claims 4 and 9 taken together, wherein the or each vibration absorbing member is constituted by an intermediate support inflatable member (100). Crible (10) selon l'une quelconque des revendications 8 à 10, comprenant, pour au moins un des vibrateurs (20), un élément (90) d'attache facile dudit vibrateur (20) à son plateau (12B, 12C) respectif, ledit élément d'attache facile (90) comportant un support (92) pour le vibrateur (20), et une platine (94), solidaire dudit support (92) et reçue dans une rainure (96) ménagée dans le plateau (12B, 12C) respectif.Screen (10) according to any one of claims 8 to 10, comprising, for at least one of the vibrators (20), an element (90) for easy attachment of said vibrator (20) to its respective plate (12B, 12C) , said easy attachment member (90) having a support (92) for the vibrator (20), and a plate (94), integral with said support (92) and received in a groove (96) in the tray (12B , 12C). Crible (10) selon l'une quelconque des revendications précédentes, comprenant un bâti (16) de support des plateaux (12A, 12B, 12C), ledit bâti (16) comprenant une pluralité de montants verticaux (80, 82, 84) définissant entre eux un espace (85) de réception des plateaux (12A, 12B, 12C), les plateaux (12A, 12B, 12C) étant libres en translation suivant la direction verticale (Z) par rapport aux montants (80, 82, 84).A screen (10) according to any one of the preceding claims, comprising a tray support frame (16) (12A, 12B, 12C), said frame (16) comprising a plurality of vertical posts (80, 82, 84) defining between them a space (85) for receiving the trays (12A, 12B, 12C), the trays (12A, 12B, 12C) being free in translation in the vertical direction (Z) relative to the uprights (80, 82, 84) . Crible (10) selon la revendication 12, dans lequel chaque montant (80, 82, 84) présente une surface d'appui contre au moins un des plateaux (12A, 12B, 12C).Screen (10) according to claim 12, wherein each upright (80, 82, 84) has a bearing surface against at least one of the trays (12A, 12B, 12C). Crible (10) selon la revendication 13, dans lequel chaque montant (80, 82, 84) comprend un absorbeur de vibrations (88), définissant la surface d'appui.The screen (10) of claim 13, wherein each post (80, 82, 84) comprises a vibration absorber (88) defining the bearing surface. Crible (10) selon l'une quelconque des revendications précédentes, dans lequel au moins un des plateaux (12A, 12C) comprend un châssis (30) rigide, présentant une canalisation interne (42) de circulation d'un fluide d'arrosage du produit, ledit plateau (12A, 12C) comprenant en outre au moins une buse (40) de projection du fluide d'arrosage sur le produit, la ou chaque buse (40) étant en communication fluidique avec ladite canalisation interne (42).Screen (10) according to any one of the preceding claims, wherein at least one of the trays (12A, 12C) comprises a rigid frame (30) having an internal pipe (42) for circulating a watering fluid of the product, said plate (12A, 12C) further comprising at least one nozzle (40) for spraying the fluid on the product, the or each nozzle (40) being in fluid communication with said inner pipe (42).
EP14162492.4A 2013-03-28 2014-03-28 Screen comprising a plurality of stacked plates, and means for vertical spacing of the plates relative to one another Withdrawn EP2783761A1 (en)

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US20140291216A1 (en) 2014-10-02

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