EP0052098B1 - Plaque perforee autonettoyante pour crible oscillant - Google Patents

Plaque perforee autonettoyante pour crible oscillant Download PDF

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Publication number
EP0052098B1
EP0052098B1 EP80902287A EP80902287A EP0052098B1 EP 0052098 B1 EP0052098 B1 EP 0052098B1 EP 80902287 A EP80902287 A EP 80902287A EP 80902287 A EP80902287 A EP 80902287A EP 0052098 B1 EP0052098 B1 EP 0052098B1
Authority
EP
European Patent Office
Prior art keywords
webs
perforated plate
projections
screen
web
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.)
Expired
Application number
EP80902287A
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German (de)
English (en)
Other versions
EP0052098A1 (fr
Inventor
Kurt Wolff
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.)
Steinhaus GmbH
Original Assignee
Steinhaus GmbH
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
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Application filed by Steinhaus GmbH filed Critical Steinhaus GmbH
Publication of EP0052098A1 publication Critical patent/EP0052098A1/fr
Application granted granted Critical
Publication of EP0052098B1 publication Critical patent/EP0052098B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
    • B07B1/469—Perforated sheet-like material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning

Definitions

  • the invention relates to a sieve plate for vibrating sieve machines.
  • Such a sieve bottom consists of at least one cast, injection-molded or vulcanized perforated plate made of rubber-elastic material, such as plastic or rubber, with a large number of sieve openings and webs enclosing these, which are integrally connected to one another and form perforated plates.
  • Sieve trays of this type are mainly used for the classification of bulk goods.
  • the sieve openings are designed to widen conically in the direction of passage of the material to be screened, so that pinched grain can migrate in the direction of passage as a result of entrainment by the material to be sieved.
  • the sieve openings of the perforated plate silt up in this case the individual particles deposited in the sieve openings are very considerably smaller than the respective grain size, which is why the conicity of the sieve openings is ineffective against such silting up.
  • a known sieve tray of the type mentioned is described in German specification 27 01 307.
  • the self-cleaning effect is improved in that elastic tongues with their own possibility of vibration are formed at the individual sieve openings.
  • Two sieve holes are connected to each other by a slot, the strip formed in this way, which is only fixed at one end to the webs, has greater elasticity than the edges of the sieve openings and leads to these relative movements.
  • the self-cleaning effect caused by this is essentially limited to the region of the free-swinging end of the tongues, since the relative movement of the tongues towards the edges of the sieve openings becomes less and less towards the connection point with the webs.
  • a known sieve tray is also described in DE-PS 965456.
  • the sieve bottom consists of elastic, strip-shaped elements, which also have strip-shaped tongues which are attached laterally in the transverse direction and which, in the intended arrangement, extend as far as the adjacent strip-shaped element and enclose the sieve openings.
  • These tongues have no connection with the respective adjacent webs and can therefore, at least in the area of their free end, perform a natural vibration and thus a relative movement with respect to the webs running through, which also results in a self-cleaning effect which is also essentially limited to the end region of the tongues.
  • the additionally vibrating tongues are at least partially provided with reinforcement and, on the other hand, protrude downward beyond the other profile height in order to achieve sufficient stitch or hole accuracy with the larger movement compared to the stiffer webs.
  • Wire sieve trays have long been known, in which the individual sieve openings are enclosed by sieve wires which are made of steel. Through a different configuration of the screen wires lying next to one another or through different wire thicknesses, relative movements of the individual screen wires are generated, which produce a cleaning effect.
  • the individual sieve wires of different bending stiffness must be fastened in a special way to each other on a common support frame.
  • wire mesh trays of this type have been in use for more than twenty years, they have so far been unable to provide any suggestion to improve the self-cleaning effect even with mesh trays of the type mentioned above with perforated plates made of rubber-elastic material (Obering. Kurt Wolff: "Mesh trays and their use” in "Processing Technology", Volume 1 (1960), Issue 11, pages 457-473 and Issue 12, pages 501 -508).
  • the invention is based on the object of achieving the self-cleaning effect in the region of each individual sieve opening by a relative movement of the sieve opening edges in order to extend the self-cleaning effect to the largest possible region of each individual sieve opening.
  • This object is achieved with a sieve bottom of the generic type in that at least two of the webs surrounding the individual sieve openings have different bending stiffness due to different cross-sections and / or reinforcements and the web openings which limit the sieve openings are formed on the webs of different bending stiffness.
  • a sieve tray according to the invention is that the continuous webs of the perforated plate deform against one another during operation, as a result of which the individual screen openings can warp in definable areas.
  • the change in shape then extends over the entire area of each sieve opening, in particular when the webs of different bending stiffness lie on opposite sides of the sieve openings.
  • it is advantageous to limit the sieve openings by means of projections molded onto the webs these approaches the relative mobility of the webs with whom they are connected.
  • these approaches can also perform a natural vibration in relation to their webs in order to intensify the cleaning effect.
  • the different bending stiffness of the two webs can, as far as the difference in the cross-sections is concerned, be caused both by a different cross-sectional shape and by a different cross-sectional size.
  • the different bending stiffness of the two webs can also be influenced by reinforcement or reinforcement. In principle, however, you can do without different cross-sectional shapes and sizes if you provide reinforcement for these webs.
  • the reinforcement of the webs of different bending stiffness can be different, but in a preferred embodiment one will alternately use a web with reinforcement and a web without reinforcement.
  • a parallel arrangement of the webs of different bending stiffness is expedient.
  • regularly arranged, equally sized screen openings, in particular screen gaps can easily be formed.
  • the parallel arrangement of these webs has the effect that the individual screen openings have a different vibration behavior at their mutually opposite edges. This is irrespective of how the sieve openings are otherwise designed or formed, which is particularly advantageous if - as already mentioned - the sieve openings are also delimited by lugs lying transversely to the webs.
  • the sieve openings are also delimited by edge webs or by webs crossing the webs of different bending stiffness, these latter webs produce the sieve bottom structure. All webs are integrally connected to each other due to the molded, injection molded or vulcanized version of the perforated plate.
  • the vibration behavior and / or the wear of the webs of different bending stiffness can also be influenced by a different projection over the top of the perforated plate.
  • the more elastic webs can protrude upwards, whereby the material to be screened, which impacts the projecting webs, increases their vibration and increases the self-cleaning effect.
  • the stiffer webs can also protrude upwards over the top of the perforated plate. This measure is taken in order to carry the coarse screenings with the protrusion of the stiffer webs, this relieves the more elastic areas and is then less prone to wear.
  • the sieve openings can also be conically widened in the direction of passage in a sieve bottom according to the invention in order to enable border grain to be removed in the usual way.
  • Fig. 1 shows the basic structure of a perforated plate for a sieve plate, which is intended for use in vibrating sieves for the classification of bulk materials.
  • the perforated plate consists of a rubber-elastic material, such as plastic or rubber. It is molded in one piece from this material, injection molded or vulcanized.
  • the perforated plate has edge webs 1, between which longitudinal webs 2 and 3 and transversely arranged webs 4 extend.
  • These bridges are next hend referred to as longitudinal webs and transverse webs, although in principle they can also be inclined to each other and to the edge webs 1.
  • the design and function of the longitudinal and transverse webs can also be interchanged, which can relate both to the entire perforated plate and to partial areas thereof.
  • the edge webs 1, which serve to support or clamp the perforated plate, have a larger cross section than the longitudinal webs 2 and 3 and the cross webs 4.
  • the cross sections of the longitudinal webs 2 and the longitudinal webs 3 are also different.
  • the cross-sectional shapes are the same because the longitudinal webs 2 and the longitudinal webs 3 have square or rectangular cross-sections, the cross-sectional size of the webs 2 and 3 is different from one another.
  • the crosspieces 2 have a larger cross section than the crosspieces 3 and therefore, because they are made of the same material because of the one-piece design of the perforated plate, only because of their larger cross section have a higher bending stiffness than the longitudinal crosspieces 3, which are smaller in cross section more elastic longitudinal webs 3 a different vibration behavior, whereby the longitudinal webs 2 perform a relative movement to the longitudinal webs 3 in operation.
  • the screen openings 5 can be formed as a continuous elongated column between the crosspieces 4, the crosspieces 4 can also be omitted entirely, so that the gap-shaped screen openings 5 then only extend between the opposing edge webs 1 of the perforated plate.
  • the screen openings 5 can also be delimited by lugs 6 on the longitudinal webs 2 and 3.
  • a gap 7 is left between the mutually opposite end faces of the web projections 6 so that the web projections 6, which are connected to webs of different vibration behavior, can move freely relative to one another.
  • Such a gap 7 on the front end face of the respective web extension 6 is also to be provided when the web extension 6 reaches up to the respectively opposite longitudinal web.
  • the web attachments 6 make it possible to subdivide each opening lying between the webs 2, 3 different bending stiffness so that sieve openings 5 of any configuration can be formed.
  • the distance “A” between the transverse web 4 adjacent to the edge web 1 is greater than the distance “B” between the cross webs 4.
  • This larger support spacing "A” ensures greater elasticity of the composite of the webs 2, 3 and 4 in the area towards the edge strip 1 into which the webs 2 and 3 of different bending stiffness open.
  • the entire perforated plate vibrates like a membrane during operation and therefore the differently rigid longitudinal webs 2 and 3 execute the greatest vibration amplitude in the central zone, the area near the edge webs 1 with the smaller vibration amplitude is disadvantageous, which is compensated for by the greater elasticity in this edge area can be. So that the same effect also occurs in the edge zone which lies towards those edge webs 1 which are parallel to the longitudinal webs 2 and 3, the distances between these longitudinal webs 2 and 3 from the relevant edge webs 1 can also be increased.
  • the webs 2 of greater flexural rigidity must always be arranged alternately with the webs 3 of lower flexural rigidity, so that, seen in the direction of the transverse webs 4, a more elastic longitudinal web 3 always follows on a stiffer longitudinal web 2 and this is followed by a more rigid longitudinal web 2.
  • Fig. 2 shows a perforated plate design, in which the different bending stiffness of the longitudinal webs 2 and 3 is not due to different cross-sectional shapes or sizes but due to a reinforcement 8.
  • the longitudinal webs 2 and 3 here have the same cross-sections and the reinforcement 8 is only seen in the transverse direction in every second longitudinal web 2, while the respective intermediate webs 3 have no reinforcement.
  • Fig. 3 shows an embodiment of a perforated plate, in which the stiffer longitudinal webs 2 have protrusions 9 projecting over the upper side 10 of the sieve, which have the task of carrying coarser screened material in order to relieve the more elastic longitudinal webs 3 and transverse webs 4 of heavy wear.
  • the vibration behavior can also be influenced with the projections 9, but it is then advantageous to provide the projections 9 on the more elastic longitudinal webs 3.
  • Fig. 4 illustrates the possibility, on the one hand, of being able to provide both the more rigid longitudinal webs 2 with stronger reinforcement 8 and the more elastic longitudinal webs 3 with a reinforcement 8 which is more flexible than the reinforcement of the more rigid longitudinal webs 2.
  • the different bending stiffness is provided both by the cross-sectional sizes of the longitudinal webs 2 and 3 and by different reinforcements 8 call.
  • the reinforcement 8 is expediently arranged in the region of the lower third of the cross section of the longitudinal webs 2 and 3.
  • the wedge-shaped design of the longitudinal webs 2 and 3, which is also provided for the transverse webs 4, can be seen particularly clearly in FIG. 4 in order to design the screen openings 5 to widen in the direction of passage.
  • This is achieved with the more rigid longitudinal webs 2 as well as with the more elastic longitudinal webs 3 and with the transverse webs 4, which, however, cannot be seen in detail in FIG. 4, by lateral boundary surfaces 11 and 12 of the webs 2-4 converging in the direction of passage.
  • Fig. 4 shows yet another special feature of the web projections 6 on the longitudinal webs 2 and 3.
  • the opposing web projections 6 have end faces 13 which diverge in the direction of passage, so that the gap 7 in between also widens in the direction of passage of the material to be screened.
  • a corresponding inclination of the end faces 13 of the web projections 6 is also to be provided if the web projections 6 of one web 2, 3 reach up to the respective other web 3, 2, in this case the conicity of the gap 7 on the one hand by the oblique end face 13 of the each web shoulder 6 and on the other hand formed by the obliquely arranged side surface 11, 12 of the web 2, 3 in question.
  • the web extensions 6 can thus taper towards their free ends towards the end face 13. This is expediently achieved by undersides 14 of the web attachments 6, which are inclined to the upper side 10 of the screen.
  • the undersides 14 of the web attachments 6 can also be curved, and the end faces 13 of the web attachments 6 can also continuously merge into the undersides 14 of these web attachments 6.

Landscapes

  • Combined Means For Separation Of Solids (AREA)

Abstract

Le fond du crible oscillant peut etre constitue d'au moins une plaque perforee coulee moulee par injection ou vulcanisee, qui est en matiere elastique, tel que le plastique ou le caoutchouc. Ce fond presente une pluralite d'ouvertures (5) et de nervures (2, 3, 4) qui les entourent, reliees entre elles en une seule piece en formant ainsi la plaque perforee. Avec une telle plaque l'effet autonettoyant est obtenu, dans une zone de chaque ouverture (5), par un mouvement relatif des bords des ouvertures, afin d'etendre l'effet autonettoyant sur une zone la plus grande possible de chaque ouverture (5). Dans ce but, au moins deux des nervures (2, 3, 4) qui entourent les ouvertures (5), ont des rigidites differentes a la flexion obtenues par des sections differenciees et/ou par des armatures (8).

Claims (9)

1. Plateau de tamisage pour machines à tamiser oscillantes, ce plateau étant constitué au moins d'une plaque à trous coulée, moulée par injection ou vulcanisée en matière élastique caoutchouteuse telle qu'une matière synthétique ou le caoutchouc, ce plateau comportant plusieurs ouvertures de tamisage, ainsi que des parties pleines entourant ces dernières, assemblées l'une à l'autre d'une seule pièce et formant la plaque à trous, caractérisé en ce qu'au moins deux des parties pleines (2-4) délimitant les différentes ouvertures de tamisage (5) ont une rigidité à la flexion différente résultant de différentes sections transversales et/ou armatures tandis que, sur les parties pleines (2, 3) d'une rigidité à la flexion différente, sont formées des saillies (6) délimitant les ouvertures de tamisage (5).
2. Plateau de tamisage suivant la revendication 1, caractérisé en ce que, parmi les deux parties pleines (2, 3) d'une rigidité à la flexion différente, l'une est pourvue d'une armature (8), tandis que l'autre en est dépourvue.
3. Plateau de tamisage suivant la revendication 1 ou 2, caractérisé en ce que les parties pleines (2,3) d'une rigidité à la flexion différente sont disposées parallèlement et alternativement l'une par rapport à l'autre.
4. Plateau de tamisage suivant la revendication 3, caractérisé en ce que les parties pleines parallèles (2, 3) sont assemblées par des parties pleines (4) qui les croisent et qui ont également une rigidité à la flexion différente.
5. Plateau de tamisage suivant la revendication 4, caractérisé en ce que, dans les zones marginales de la plaque à trous, l'écartement des parties pleines parallèles (2, 3) et/ou des parties pleines (4) qui les croisent, est plus grand que vers le centre de cette plaque.
6. Plateau de tamisage suivant une des revendications 1 à 5, caractérisé en ce que les parties pleines (2 ou 3) ayant une rigidité à la flexion ressortent en saillie au-dessus de la face supérieure (10) de tamisage de la plaque à trous vis-à- vis des parties pleines (2 ou 3) ayant l'autre rigidité à la flexion.
7. Plateau de tamisage suivant une des revendications 3 à 6, caractérisé en ce que, transversalement entre les parties pleines mutuellement parallèles (2, 3), les saillies (6) sont décalées l'une par rapport à l'autre ou disposées face à face, tandis qu'une fente (7) est ménagée entre la face frontale des saillies (6) et la saillie (6) ou la partie pleine (2, 3) qui lui fait chaque fois face.
8. Plateau de tamisage suivant la revendication 7, caractérisé en ce que la fente (7) ménagée entre deux saillies (6) s'élargit dans le sens du passage.
9. Plateau de tamisage suivant la revendication 7 ou 8, caractérisé en ce que les saillies (6) des parties pleines (2, 3) se rétrécissent vers leurs extrémités libres.
EP80902287A 1980-02-20 1980-12-01 Plaque perforee autonettoyante pour crible oscillant Expired EP0052098B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3006364A DE3006364B1 (de) 1980-02-20 1980-02-20 Lochplatten-Siebboden mit Selbstreinigungswirkung
DE3006364 1980-02-20

Publications (2)

Publication Number Publication Date
EP0052098A1 EP0052098A1 (fr) 1982-05-26
EP0052098B1 true EP0052098B1 (fr) 1984-05-16

Family

ID=6095100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80902287A Expired EP0052098B1 (fr) 1980-02-20 1980-12-01 Plaque perforee autonettoyante pour crible oscillant

Country Status (9)

Country Link
US (1) US4563270A (fr)
EP (1) EP0052098B1 (fr)
JP (1) JPS57500093A (fr)
AU (1) AU538559B2 (fr)
BR (1) BR8009095A (fr)
CA (1) CA1157426A (fr)
DE (1) DE3006364B1 (fr)
WO (1) WO1981002398A1 (fr)
ZA (1) ZA811106B (fr)

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US4960510A (en) * 1987-06-26 1990-10-02 Steinhaus Gmbh Screening apparatus having a screen grid with a plurality of exchangeable screen elements
US4832834A (en) * 1988-07-11 1989-05-23 Baird Jr Howard R Elastomer sieve screen
AU608392B2 (en) * 1988-09-29 1991-03-28 Manfred Franz Axel Freissle Screening arrangement
DE4445515C2 (de) * 1993-12-21 1997-02-13 Nilos Gmbh Siebeinrichtung
AU712862B2 (en) * 1996-07-24 1999-11-18 Schenck Process Australia Pty Limited Fine ore screening panel
AUPO213796A0 (en) 1996-09-05 1996-09-26 Lettela Proprietary Limited Modular screen panel
US5944197A (en) * 1997-04-24 1999-08-31 Southwestern Wire Cloth, Inc. Rectangular opening woven screen mesh for filtering solid particles
US6601709B2 (en) * 1999-09-03 2003-08-05 Tuboscope I/P, Inc. Screen support and screens for shale shakers
US20030012833A1 (en) * 2001-06-27 2003-01-16 Freissle Manfred Franz Axel Screening arrangement
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WO2003013555A1 (fr) * 2001-08-08 2003-02-20 Board Of Regents, The University Of Texas System Procede permettant d'amplifier l'expression a partir d'un promoteur a specificite cellulaire
ATE358543T1 (de) * 2002-01-08 2007-04-15 Rcm Plastics Cc Siebelement
US7788867B2 (en) * 2004-10-13 2010-09-07 General Electric Company Floor tile debris interceptor and transition plenum in a nuclear power plant
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CA2573726C (fr) * 2006-01-13 2014-10-21 Johnson Screens (Australia) Pty Ltd. Module de criblage
US7753213B2 (en) * 2006-03-30 2010-07-13 M-I Llc Composite screen
US8167134B2 (en) * 2006-06-30 2012-05-01 Tandem Products, Inc. Sifting screen structure
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US7987991B2 (en) * 2006-08-30 2011-08-02 Voith Patent Gmbh Pulper with screen plate having maximum defibering edges
AU2008201367A1 (en) * 2008-02-15 2009-09-03 Screenex Manufacturing (Pty) Ltd Screen panels
WO2009101481A1 (fr) * 2008-02-15 2009-08-20 Screenex Manufacturing (Pty) Ltd Panneaux de tamis
GB0823402D0 (en) * 2008-12-23 2009-01-28 United Wire Ltd Improved sifting screen
PE20131486A1 (es) * 2010-09-01 2014-02-01 Tega Ind Ltd Panel de cribado con aberturas mejoradas
EP2796211B1 (fr) * 2013-04-25 2015-06-10 Sandvik Intellectual Property AB Supports de criblage
PL232751B1 (pl) * 2013-08-12 2019-07-31 Int Tobacco Machinery Poland Spolka Z Ograniczona Odpowiedzialnoscia Zespół do oddzielania i sposób oddzielania wybranych obiektów wadliwych z grupy obiektów stosowanych w przemyśle tytoniowym
CN108025313B (zh) * 2015-08-21 2020-12-22 克罗多工程公司 高效锥形研磨机
USD832970S1 (en) * 2017-03-08 2018-11-06 Yi Huei Jen Perforated plate for firearms
CN109277294B (zh) * 2018-12-10 2023-08-04 金陵科技学院 一种防粘板双层振动筛
FR3110456B1 (fr) * 2020-05-20 2022-09-09 Etablissements Faivre Panneau filtrant et filtre a tambour equipe de tels panneaux
CN116764954B (zh) * 2023-08-17 2023-10-24 云南凯瑞特工程机械设备有限公司 一种重型筛分站用振动筛
CN117654891A (zh) * 2023-12-15 2024-03-08 中国神华能源股份有限公司哈尔乌素露天煤矿 筛板

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Also Published As

Publication number Publication date
DE3006364B1 (de) 1980-11-13
ZA811106B (en) 1982-03-31
JPS57500093A (fr) 1982-01-21
AU6573080A (en) 1981-09-11
BR8009095A (pt) 1982-06-01
WO1981002398A1 (fr) 1981-09-03
AU538559B2 (en) 1984-08-16
US4563270A (en) 1986-01-07
EP0052098A1 (fr) 1982-05-26
CA1157426A (fr) 1983-11-22

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