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EP2603328B1 - Appareil a tamiser - Google Patents

Appareil a tamiser Download PDF

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Publication number
EP2603328B1
EP2603328B1 EP11741183.5A EP11741183A EP2603328B1 EP 2603328 B1 EP2603328 B1 EP 2603328B1 EP 11741183 A EP11741183 A EP 11741183A EP 2603328 B1 EP2603328 B1 EP 2603328B1
Authority
EP
European Patent Office
Prior art keywords
members
support
frame
screen
support frame
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.)
Not-in-force
Application number
EP11741183.5A
Other languages
German (de)
English (en)
Other versions
EP2603328A1 (fr
Inventor
Joseph Taylor
Sean Conlon
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.)
CRS (NI) Ltd
Original Assignee
CRS (NI) Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CRS (NI) Ltd filed Critical CRS (NI) Ltd
Publication of EP2603328A1 publication Critical patent/EP2603328A1/fr
Application granted granted Critical
Publication of EP2603328B1 publication Critical patent/EP2603328B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status 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
    • B07B1/48—Stretching devices for screens
    • B07B1/485—Devices for alternately stretching and sagging screening surfaces

Definitions

  • This invention relates to a screening apparatus for screening, grading and/or sorting granular and/or particulate material.
  • a screening apparatus comprising a frame and a flexible screen attached at intervals to parallel screen supports which are mechanically driven so that adjacent supports alternately approach each other and recede from each other in such a way that the screen between them is alternatively flexed and stretched to produce stationary waves.
  • Screening machines of this kind are known from US 4,600,506 and US 2,980,254 .
  • the formation of stationary waves by the alternate flexing and stretching of the screen at various positions applies very high accelerations to the material being screened, assisting in separating the material and allowing particles below a certain size to pass through the screen.
  • This effect is particularly marked when the screen vibrates locally between a strongly convex shape and a moderately convex or substantially flat shape, that is to say between a slack or flexed state and a taut or stretched state.
  • the screen is mounted at an inclined angled so that material is conveyed down the screen under the action of gravity as it is agitated by the vibratory motion of the screen.
  • this vibration of the flexible screen is obtained by mounting the screen on supports which are alternately mounted on two separate frame systems mounted to permit linear motion with respect to each other. At least one of the frame systems is typically provided with an oscillating or eccentrically mounted mass which is driven to impart a vibratory motion to the frame system.
  • the frame systems are typically mounted on a base frame by means of resilient mounts so that the base frame is isolated from the vibratory motion of the frame systems.
  • Such known systems generally rely on resonance to create the desired out of phase movement between the two separate frame systems to create vibratory movement of the screen.
  • a screening apparatus as claimed in claim 1.
  • the frame members of the first support frame may be arranged to lie between the frame members of the second support frame.
  • connection means comprising an outer polygonal member provided on one of said second end of the connecting rod and said respective support frame and an inner polygonal member provided on the other of the second end of the connecting rod and the respective support frame, said inner polygonal member being located within the outer polygonal member, said inner member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the connecting rod with respect to a respective one of the first and second support frames to either side of a substantially central neutral position.
  • Both of said first and second support frames are coupled to the base frame via respective connecting rod journalled on a respective eccentrically arranged bearing surface of the shaft for imparting reciprocating motion to said first and second support frames, said respective bearing surfaces being angularly offset with respect to each other, preferably by 180° such that said first and second transverse members are linearly reciprocated in opposing directions.
  • the first support frame is mounted on the base frame via resilient mounting means permitting linear oscillating motion of said first support frame with respect to said base frame.
  • said resilient mounting means comprise elastomeric blocks mounted between the base frame and the first support frame such that the elastomeric blocks are exposed to shear strain during said linear oscillating motion of the first support frame with respect to the base frame.
  • Each connection means comprises an outer polygonal member and an inner polygonal member, said inner polygonal member being located within the outer polygonal member and member being angularly offset with respect to the outer member to define a plurality of chambers between the walls of the inner and outer members, one or more resilient members, such as elastomeric blocks, preferably rubber blocks, being provided in said plurality of chambers, wherein said resilient members are placed under compressive strain during pivotal movement of the respective hanger member with respect to the first and second support frames to either side of a substantially central neutral position.
  • resilient members such as elastomeric blocks, preferably rubber blocks
  • a screening apparatus in accordance with a first embodiment of the present invention is s illustrated in Figures 1 to 8 and comprises a base frame 10 upon which is mounted first and second screen support frames 12,14.
  • the first support frame 12 comprises a pair of parallel longitudinally arranged side beams 16,18 bridged by a plurality of mutually spaced apart first screen support members 20 extending transversely to the normal conveying direction of the material to be screened.
  • the second support frame 14 comprises a pair of parallel longitudinally arranged side beams 22,24 spaced to be located on either side of the first support frame 12, said side beams 22,24 being bridged by a plurality of mutually spaced apart second screen support members 26 extending transversely to the normal conveying direction of the material to be screened, wherein the first and second support frames 12,14 are mounted on the base frame 10 such that said plurality of first screen support members 20 are interposed in alternating relationship between said plurality of second screen support members 26.
  • a flexible screen 28 is attached to and carried by said plurality of first and second screen support members 20,26, said screen 28 having apertures of predetermined size to allow particles smaller than said predetermined size to pass therethough whereby particles larger than said predetermined size are retained on the screen for screening material placed on the screen.
  • a discharge shoot 30 is mounted on a downstream end of the first support frame 12 for receiving material from the screen 28.
  • the first support frame 12 is mounted on the base frame 10 via four rubber mounting bushes 32 respectively located adjacent each end of the each side beam 16,18 of the first support frame 12 whereby the first support frame 12 is permitted to reciprocate in a linear fashion with respect to the base frame 10, the bushes 32 being exposed to a shear strain during displacement of the first frame 12 with respect to the base frame 10 thus providing a biasing force towards a neutral central position of the first support frame 12 and absorbing the kinetic energy of the first support member 12 as it approaches its limits of movement with respect to the base frame 10.
  • the second support frame 14 is suspended from the first support frame 12 by means of four elongate hanger members 34 respectively located adjacent each end of the side beams 16,18,22,24 of the first and second support frames 12,14.
  • the ends of the hanger members 34 are pivotally connected to the side beams 16,18,22,24 of the first and second support frames 12,14 by connection means permitting relative movement between the first and second support frames 12,14 in the normal conveying direction of material to be screened, parallel to the longitudinal side beams 16,18,22,24 of the support frames 12,14, such that the second support frame 14 effectively swings from the first support frame 12.
  • each connection means comprises concentrically mounted outer and inner member 36,38, each outer member being mounted on a side beam of a respective support frame 12,14 and each inner member being mounted on an end of a respective hanger member 34.
  • Both the outer and inner members 36,38 of each connection means have a square cross section and said inner member 38 being located within the outer member 36 and member being angularly offset with respect to the outer member by 45° to define a plurality of chambers between the walls of the inner and outer members 36,38, a rubber block 40 being provided in each chamber, wherein said rubber blocks are placed under compressive strain during pivotal movement of the respective hanger member 34 with respect to the first and second support frames 12,14 to either side of a substantially central neutral position during reciprocating motion of the support frames 12,14 relative to one another.
  • Such connection means are similar to those used in simple trailer and caravan suspension arms and provide a reliable, robust and hard wearing pivot function while providing a resilient biasing action and good shock absorption.
  • a drive motor 42 is mounted on the base frame 10, preferably at a first end of the base frame 10 comprising an upstream end of the screening device in relation to the normal direction of travel of the material to be screened.
  • An elongate shaft 44 is rotatably mounted on said first end of the base frame 10 to extend transversely across the width of the base frame 10, a drive belt (not shown) extending between respective pulleys 46,48 respectively mounted on the drive motor 42 and shaft 44 whereby the drive motor 42 can be driven to rotate the shaft 44.
  • a pair of spaced apart eccentrically arranged bearing surfaces are provided at each end of the shaft 44 upon which are journalled respective connecting rods 50,52,54,56 via suitable bearings.
  • An inner pair of connecting rods 52,54 are connected to respective side beams 16,18 of the first support frame 12 while an outer pair of connecting rods 50,56 are connected to respective side beams 22,24 of the second support frame 14.
  • the bearing faces associated with the outer pair of connecting rods 50,56 are offset from those of the inner pair of connecting rods 52,54 other by 180° so that the first and second frame 12,14 are moved in reciprocating manner with respect to the base frame 10 in opposite directions as the shaft 44 is rotated, causing the first and second screen support members 20,26 to move relative to one another so that adjacent pairs of first and second screen support members 20,26 alternately approach each other and recede from each other in such a way that the screen 28 between them is alternatively flexed and stretched to produce stationary waves.
  • Each connecting rod 50,52,54,56 is connected to a respective one of the first and second support frames 12,14 by a resilient connection means 58 similar to those used to connect the hanger members 34 to the first and second support frames 12,14.
  • Each connection means 58 includes concentrically mounted inner and outer members defining chamber therebetween containing rubber blocks whereby the rubber blocks are placed under compressive strain during pivotal movement of the respective connecting rod 50,52,54,56 with respect to the first and second support frames 12,14 to either side of a substantially central neutral position during rotation of the shaft 44.
  • the rubber bushes 32 act to absorb the forces applied to the base frame 10 by the first support frame 12 due to the acceleration and deceleration of the first support frame 12 under the action of the connecting rods 42,44 while the rubber blocks of the connection means of each hanger member absorb the forces applied to the first and second frame members by the connecting rods and bias the frame members towards a central neutral position.
  • the base frame 10 is mounted at a suitable inclined angle with the discharge chute 30 lowermost and positioned so that material to be screened is delivered onto an upstream end of the screen 28.
  • Rotation of the shaft 44 causes the connecting rods 50,52,54,56 to drive the first and second support frames 12,14 backwards and forwards with respect to one another, causing adjacent first and second screen support members 20,26 to alternately approach each other and recede from each other in such a way that the screen 28 between them is alternatively flexed and stretched to produce stationary waves.
  • the rubber bushes 32 and resilient connection means of the hanger members 34 and connecting rods 50,52,54,56 act as shock absorbers, reducing the vibrations transmitted to the base frame 10 and preventing excessive loading on the components of the screening apparatus.
  • a screening apparatus in accordance with a further embodiment of the present invention is illustrated in Figures 9 to 12 .
  • the screening apparatus is very similar to that of the first embodiment, comprising a base frame 10 upon which is mounted first and second screen support frames 12,14.
  • the screening apparatus of the second embodiment differs from the first embodiment in that it includes two vertically stacked flexible screens comprising an upper screen 28A and a lower screen 28B.
  • the upper screen 28A is provided with apertures of a first predetermined size to allow particles smaller than said first predetermined size to pass therethrough, while larger particles are retained on the upper screen 28A
  • the lower screen 28B is provided with apertures of a second predetermined size, smaller than said first predetermined size, to allow particles smaller than said second predetermined size to pass therethrough.
  • the stacked upper and lower screens 28A,28B provided a three stage separating process, larger particles being retained on the upper screen 28A to be collected from an upper discharge chute 30A, intermediate particles being retained on the lower screen 28B to be collected from a lower discharge chute 30B and the remaining smallest particles being collected below the second screen 28B.
  • the first support frame 12 comprises a pair of parallel longitudinally arranged side beams 16,18 bridged by upper and lower rows of mutually spaced apart first screen support members 20A,20B extending transversely to the normal conveying direction of the material to be screened.
  • the second support frame 14 comprises a pair of parallel longitudinally arranged side beams 22,24 spaced to be located on either side of the first support frame 12, said side beams 22,24 being bridged by upper and lower rows of mutually spaced apart second screen support members 26A,26B extending transversely to the normal conveying direction of the material to be screened, wherein the first and second support frames 12,14 are mounted on the base frame 10 such that each of the upper and lower rows of first screen support members 20A,20B are interposed in alternating relationship between respective upper and lower rows of second screen support members 26A,26B.
  • the upper screen 28A is attached to and carried by said upper rows of first and second screen support members 20A,28A while the lower screen 28B is attached to and carried by said lower rows of first and second screen support members 20B,28B.
  • the screening apparatus of the second embodiment operates in the same way as that of the first embodiment, an electric drive motor 42 being mounted on the base frame 10 coupled to the support frames 12,14 to impart reciprocating motion to the support frames 12,14 relative to one another to produce stationary waves on each of the upper and lower flexible screens 28A,28B.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Claims (6)

  1. Appareil de tamisage comportant un cadre de base (10) ;
    un premier cadre de support (12) comportant une paire d'éléments de cadre (16, 18) s'étendant dans le sens longitudinal reliés par une pluralité de premiers éléments de support de tamis (20) espacés mutuellement les uns par rapport aux autres s'étendant dans le sens transversal par rapport à la direction de transport du matériau devant être tamisé ;
    un second cadre de support (14) ayant une paire d'éléments de cadre s'étendant dans le sens longitudinal (22, 24) reliés par une pluralité de seconds éléments de support de tamis espacés mutuellement les uns par rapport aux autres (26) s'étendant dans le sens transversal par rapport à la direction de transport du matériau devant être tamisé ;
    lesdits premier et second cadres de support (12, 14) étant agencés de telle sorte que les éléments de support de tamis de ladite pluralité de premiers éléments de support de tamis (20) sont intercalés en une relation alternée entre ladite pluralité de seconds éléments de support de tamis (26) ;
    un tamis flexible (28) supporté par ladite pluralité de premiers et seconds éléments de support de tamis (20, 26), ledit tamis (28) ayant des ouvertures de taille prédéterminée pour permettre à des particules de taille inférieure à ladite taille prédéterminée de passer à travers celles-ci, ce par quoi des particules de taille supérieure à ladite taille prédéterminée sont retenues sur le tamis (28) à des fins de tamisage du matériau placé sur le tamis ;
    un moyen d'entraînement (42) mis en oeuvre pour communiquer un mouvement de va-et-vient sensiblement linéaire au premier cadre de support (12) par rapport au second cadre de support (14) pour effectuer un mouvement relatif entre lesdits premiers et seconds éléments de support de tamis (20, 26), ce par quoi des paires adjacentes desdits premiers et seconds éléments de support de tamis (20, 26) se rapprochent les uns par rapport aux autres et s'éloignent les uns par rapport aux autres en alternance de telle manière que le tamis (28) entre eux est fléchi et étiré en alternance pour produire des ondes stationnaires, dans lequel le moyen d'entraînement (42) comporte un arbre entraîné par rotation (44) ayant des surfaces d'appui agencées de manière excentrée sur lesquelles sont tourillonnées des premières extrémités respectives d'une bielle respective (50, 52, 54, 56), une seconde extrémité de la bielle respective (50, 52, 54, 56) étant raccordée à un cadre respectif desdits premier et second cadres de support (12, 14) de telle sorte que le mouvement de rotation de l'arbre (44) se traduit en un mouvement de va-et-vient dudit cadre de support respectif (12, 14), dans lequel les deux cadres parmi lesdits premier et second cadres de support (12, 14) sont accouplés au cadre de base (10) par le biais de bielles respectives (50, 52, 54, 56) tourillonnées sur une surface d'appui respective agencée de manière excentrée de l'arbre (44) pour communiquer un mouvement de va-et-vient auxdits premier et second cadres de support (12, 14), lesdites surfaces d'appui respectives étant décalées de manière angulaire les unes par rapport aux autres, de telle manière que lesdits premiers et seconds éléments transversaux (20, 26) décrivent un mouvement de va-et-vient de manière linéaire dans des directions opposées, caractérisé en ce que le premier cadre de support (12) est monté sur le cadre de base (10) par le biais de blocs élastomères (32) montés entre le cadre de base (10) et le premier cadre de support (12) de telle sorte que les blocs élastomères (32) sont exposés à un effort de cisaillement lors d'un mouvement oscillant linéaire du premier cadre de support (12) par rapport au cadre de base (10), et le second cadre de support (14) étant suspendu depuis le premier cadre de support (12) par le biais d'une pluralité d'éléments de suspension allongés (34) pour permettre un mouvement relatif entre les premier et second cadres de support (12, 14) dans la direction normale de transport du matériau devant être tamisé sur le tamis flexible (28), lesdits éléments de suspension allongés (34) s'étendant entre les éléments de cadre s'étendant dans le sens longitudinal (16, 18) du premier cadre de support (12) et les éléments de cadre s'étendant dans le sens longitudinal (22, 24) du second cadre de support (14), ce par quoi le second cadre de support (14) est supporté par le premier cadre de support (12), dans lequel des extrémités supérieure et inférieure de chaque élément de suspension allongé (34) sont raccordées de manière pivotante aux premier et second cadres de support respectifs (12, 14) par un moyen de raccordement permettant un mouvement de pivotement autour d'un axe respectif s'étendant de manière transversale par rapport aux éléments de cadre longitudinaux (16, 18, 22, 24) des premier et second cadres de support (12, 14) et dans lequel chaque moyen de raccordement comporte un élément polygonal extérieur (36) et un élément polygonal intérieur (38), ledit élément polygonal intérieur (38) étant situé à l'intérieur de l'élément polygonal extérieur (36) et étant décalé de manière angulaire par rapport à l'élément extérieur (36) pour définir une pluralité de chambres entre les parois des éléments intérieur et extérieur (38, 36), un ou plusieurs blocs élastomères (40) étant mis en oeuvre dans ladite pluralité de chambres, dans lequel lesdits blocs élastomères (40) sont soumis à un effort de compression au cours du mouvement de pivotement de l'élément de suspension respectif (34) par rapport aux premier et second cadres de support (12, 14) de chaque côté d'une position neutre sensiblement centrale.
  2. Appareil selon la revendication 1, dans lequel les éléments de cadre (16, 18) du premier cadre de support (12) sont agencés pour reposer entre les éléments de cadre (22, 24) du second cadre de support (14).
  3. Appareil selon la revendication 1 ou la revendication 2, dans lequel la seconde extrémité de chaque bielle (50, 52, 54, 56) est raccordée au cadre respectif parmi lesdits premier et second cadres de support (12, 14) par un moyen de raccordement (58) comportant un élément polygonal extérieur mis en oeuvre sur l'un parmi ladite seconde extrémité de la bielle (50, 52, 54, 56) et ledit cadre de support respectif (12, 14) et un élément polygonal intérieur mis en oeuvre sur l'autre parmi la seconde extrémité de la bielle (50, 52, 54, 56) et le cadre de support respectif (12, 14), ledit élément polygonal intérieur étant situé à l'intérieur de l'élément polygonal extérieur, ledit élément intérieur étant décalé de manière angulaire par rapport à l'élément extérieur pour définir une pluralité de chambres entre les parois des éléments intérieur et extérieur, un ou plusieurs éléments élastiques étant mis en oeuvre dans ladite pluralité de chambres, dans lequel lesdits éléments élastiques sont soumis à un effort de compression au cours du mouvement de pivotement de la bielle par rapport à un cadre respectif parmi les premier et second cadres de support de chaque côté d'une position neutre sensiblement centrale.
  4. Appareil selon la revendication 3, dans lequel lesdits éléments élastiques comportent des blocs élastomères.
  5. Appareil selon la revendication 4, dans lequel lesdits éléments élastiques comportent des blocs en caoutchouc.
  6. Appareil selon l'une quelconque des revendications précédentes, dans lequel lesdites surfaces d'appui respectives de l'arbre entraîné par rotation (44) sont décalées de manière angulaire les unes par rapport aux autres de 180° de telle sorte que lesdits premiers et seconds éléments transversaux (20, 26) décrivent un mouvement de va-et-vient de manière linéaire dans des directions opposées.
EP11741183.5A 2010-08-09 2011-07-29 Appareil a tamiser Not-in-force EP2603328B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1013373.4A GB2482686A (en) 2010-08-09 2010-08-09 Stationary wave separator
PCT/EP2011/063144 WO2012019929A1 (fr) 2010-08-09 2011-07-29 Appareil de tamisage

Publications (2)

Publication Number Publication Date
EP2603328A1 EP2603328A1 (fr) 2013-06-19
EP2603328B1 true EP2603328B1 (fr) 2014-12-10

Family

ID=42931398

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11741183.5A Not-in-force EP2603328B1 (fr) 2010-08-09 2011-07-29 Appareil a tamiser

Country Status (3)

Country Link
EP (1) EP2603328B1 (fr)
GB (1) GB2482686A (fr)
WO (1) WO2012019929A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4180134A1 (fr) * 2021-11-15 2023-05-17 Johann Sedlmayer Dispositif de nettoyage du bois de chauffage

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103230868B (zh) * 2013-04-16 2016-02-24 郑州兆丰成套设备有限公司 抽屉式粉料检验筛
CN115921287B (zh) * 2022-11-10 2024-08-09 元源新材料有限公司 一种玻璃纤维物料输送装置

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US2980254A (en) 1958-02-28 1961-04-18 Beteiligungs & Patentverw Gmbh Resonant oscillatory screening device
DE1204920B (de) * 1963-01-05 1965-11-11 Albert Wehner Sieb- oder Foerdermaschine
DE2216130A1 (de) * 1972-04-01 1973-10-04 Albert Wehner Sieb- oder foerdermaschine
US4188288A (en) * 1972-11-30 1980-02-12 Hein, Lehmann Ag Screen with tubular frame systems coupled for rectilinear motion
DE3221344C1 (de) * 1982-06-05 1983-10-27 Hein, Lehmann AG, 4000 Düsseldorf Siebmaschine
AT400533B (de) * 1992-12-11 1996-01-25 Ife Gmbh Spannwellensieb
DE10016979C1 (de) * 2000-04-06 2001-08-30 Joest Gmbh & Co Kg Siebvorrichtung
US7810648B2 (en) * 2006-06-21 2010-10-12 Tylinter, Inc. Screen assembly for separating material according to particle size

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4180134A1 (fr) * 2021-11-15 2023-05-17 Johann Sedlmayer Dispositif de nettoyage du bois de chauffage

Also Published As

Publication number Publication date
GB201013373D0 (en) 2010-09-22
WO2012019929A1 (fr) 2012-02-16
GB2482686A (en) 2012-02-15
EP2603328A1 (fr) 2013-06-19

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