EP0052098A1 - Self cleaning, perforated plate for oscillating sieve. - Google Patents
Self cleaning, perforated plate for oscillating sieve.Info
- Publication number
- EP0052098A1 EP0052098A1 EP80902287A EP80902287A EP0052098A1 EP 0052098 A1 EP0052098 A1 EP 0052098A1 EP 80902287 A EP80902287 A EP 80902287A EP 80902287 A EP80902287 A EP 80902287A EP 0052098 A1 EP0052098 A1 EP 0052098A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- webs
- sieve
- perforated plate
- bending stiffness
- 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.)
- Granted
Links
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 plate consists of at least one molded, 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 them, which are integrally connected to one another and form perforated plates.
- Sieve trays of this type are primarily used for classifying bulk goods.
- the sieve openings are designed to widen conically in the direction of passage of the material to be screened, so that jammed border grain migrates in the direction of passage as a result of entrainment by the material to be sieved can.
- the sieve openings of the perforated plate are silted up, the individual particles deposited in the sieve openings being 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 screen of the type mentioned is described in German Auslesges ⁇ hrift 27 01.307.
- the self-cleaning effect is improved in that elastic tongues with their own possibility of vibration are formed on the individual sieve openings. Are in each case two screen holes connected by a slot, the strips formed in this manner, only one end fixed to the webs has over the edges' of the screen openings a greater elasticity and executes these relative movements.
- the self-cleaning effect caused by this is essentially limited to the area 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 965 456.
- the sieve bottom consists of elastic, stripe-shaped elements that in the transverse direction laterally attached, also strip-shaped tongues ' , which extend as intended up to 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 passing through, as a result of which a self-cleaning effect occurs, which here too is essentially limited to the end area of the tongues .
- the tongues which are additionally capable of vibration are at least partially provided with reinforcement and, on the other hand, protrude downward beyond the other profile height in order to achieve adequate stitch or hole fidelity with the larger movement compared to the stiffened 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 produced which produce a cleaning effect.
- the individual sieve wires under- " Different bending stiffness must be attached to a common support frame in a particularly coordinated manner.
- wire mesh trays of this type have been in use for more than twenty years, they have so far been unable to give any suggestion to improve the self-cleaning effect even with mesh trays of the type mentioned at the beginning with perforated plates made of rubber-elastic material. (Obering. Kurt Wolff: “Sieve trays and their use” in "Preparation 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.
- the different bending stiffness of the two webs can, as far as the difference in the cross-sections is concerned, be due both to a different cross-sectional shape and to a different cross-sectional size.
- the different bending stiffness of the two webs can also be influenced by reinforcement or reinforcement. Basically, however, you can do without different cross-sectional shapes and sizes if you have reinforcement of these webs provides.
- 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. It can thus regularly arranged / equal screen openings, in particular 'can be easily formed screening gaps.
- the parallel arrangement of these webs has the effect that the individual sieve 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 which cross the webs of different rigidity, these latter webs producing 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.
- Perforated plate towards a larger vibration amplitude than at the supported edge To do this on To achieve sufficient self-cleaning effect at the edge, it is advantageous to make the connection of the parallel and crossing webs less rigid by increasing the distance either between the parallel and crossing webs or only the parallel or crossing webs towards the edge zones of the plate makes. As a result, a larger vibration amplitude is also obtained in the area of the peripheral zones.
- 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, so that 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 coarser screen material with the protrusion of the stiffer webs, this relieves the more elastic areas and is then less prone to wear.
- the sieve bottom according to the invention can also be direction conical widening of the sieve openings can be provided in order to enable border grain to be removed in the usual way.
- Fig. 1 is a perspective, sectioned
- Fig. 2 shows a cross section through another
- FIG. 3 shows a partial cross section through a further embodiment of a perforated plate for a sieve tray according to the invention
- FIG. 4 shows a partial cross section in an enlarged representation through a fourth embodiment of a perforated plate for. a sieve tray according to the invention.
- Fig. 1 shows the basic structure of a a perforated plate for a sieve bottom, 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.
- edge webs 1 These webs are referred to below as longitudinal webs and transverse webs, although in principle they can also run at an angle to one another 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 crossbars 2 have namely the larger cross section compared to the crossbars 3 and have Therefore, because they are made because of the integrity of the perforated plate of the same material, only because of their larger cross-section of a higher bending stiffness third than the other hand, smaller in cross section longitudinal webs you therefore have against 'the elastic longitudinal webs 3, another Schwingungsver ⁇ hold, whereby in use the Execute longitudinal webs 2 relative to the longitudinal webs 3.
- the sieve openings 5 can be designed as a continuous elongated gap between the transverse webs 4, the transverse webs 4 can also be omitted entirely, so that the gap-shaped sieve openings 5 then only extend between the mutually opposite edge webs 1 of the perforated plate.
- the number of crossbars 4 that support the composite of the perforated plate naturally also depends on the size of the perforated plate.
- the sieve openings 5 can also be delimited by projections 6 on the longitudinal webs 2 and 3.
- projections 6 on the longitudinal webs 2 and 3 are each two such web projections 6, which are molded onto different webs 2, 3, opposite one another, an offset arrangement of the projections 6 on the webs 2, 3 is also possible.
- a gap 7 is left in each case between the mutually opposite end faces of the web extensions 6, so that the web extensions 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 attachment 6 is also to be provided when the web attachment 6 extends up to the respectively opposite longitudinal web.
- the web extensions 6 make it possible to subdivide each opening lying between the webs 2, 3 of different bending stiffness in such a way that sieve openings 5 of any configuration can be formed.
- the distance "A" between the cross bar 4 adjacent to the edge web 1 is greater than the distance "B" between the cross webs 4.
- This larger support spacing H A "ensures greater elasticity of the composite of the webs 2, 3 and 4 in the area towards that edge strip 1 into which the webs 2 and 3 of different bending stiffness open. Since in operation the entire perforated plate is like one Membrane vibrates and therefore the differently rigid longitudinal webs 2 and 3 execute the greatest vibration amplitude in the middle zone, on the other hand, the area near the edge webs 1 with the smaller vibration amplitude disadvantageous, which can be compensated for by the greater elasticity in this edge area. 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 with greater bending stiffness must always be alternately arranged with the webs 3 with lower bending stiffness, so that in the direction of the transverse webs 4 15 ; seen always on a more rigid longitudinal web 2, a more elastic longitudinal web 3 and this is followed by a more rigid longitudinal web 2.
- Fig. 2 shows a perforated plate design, at 0 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 5 the reinforcement 8 is only seen in the transverse direction in every second longitudinal web 2, while the intermediate webs 3 in between have no reinforcement.
- FIG. 3 shows an embodiment for a
- 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.
- the reinforcement 8 caused the different bending stiffness.
- the reinforcement 8 is expediently arranged in the region of the lower third of the cross section of the longitudinal webs 2 and 3. 5
- 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 sieve openings 5 to widen in the direction of passage. This is achieved with the stiffer longitudinal webs 2 as well as with the more elastic longitudinal webs 3 and. Transverse webs 4, which, however, cannot be seen in detail in FIG. 4, due to lateral boundary surfaces 11 and 12 of the webs 2-4 that converge in the direction of passage.
- FIG. 4 shows yet another special feature of the web extensions 6 on the longitudinal webs 2 and 3.
- the web extensions 6, which are located opposite one another, have. namely diverging in the forward direction
- the web shoulders 6 towards their free ends may be tapered so 'to the end face 13 side.
- 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).The bottom of the oscillating screen may consist of at least one injection-molded or vulcanized cast perforated plate, which is made of elastic material, such as plastic or rubber. This bottom has a plurality of openings (5) and ribs (2, 3, 4) which surround them, interconnected in a single piece, thus forming the perforated plate. With such a plate, the self-cleaning effect is obtained, in an area of each opening (5), by a relative movement of the edges of the openings, in order to extend the self-cleaning effect over the largest possible area of each opening (5). ). To this end, at least two of the ribs (2, 3, 4) which surround the openings (5) have different flexural stiffnesses obtained by differentiated sections and / or by reinforcements (8).
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3006364A DE3006364B1 (en) | 1980-02-20 | 1980-02-20 | Perforated plate sieve bottom with self-cleaning effect |
DE3006364 | 1980-02-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0052098A1 true EP0052098A1 (en) | 1982-05-26 |
EP0052098B1 EP0052098B1 (en) | 1984-05-16 |
Family
ID=6095100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80902287A Expired EP0052098B1 (en) | 1980-02-20 | 1980-12-01 | Self cleaning, perforated plate for oscillating sieve |
Country Status (9)
Country | Link |
---|---|
US (1) | US4563270A (en) |
EP (1) | EP0052098B1 (en) |
JP (1) | JPS57500093A (en) |
AU (1) | AU538559B2 (en) |
BR (1) | BR8009095A (en) |
CA (1) | CA1157426A (en) |
DE (1) | DE3006364B1 (en) |
WO (1) | WO1981002398A1 (en) |
ZA (1) | ZA811106B (en) |
Families Citing this family (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8418658D0 (en) * | 1984-07-21 | 1984-08-22 | Thule United Ltd | Filtering screens |
AU579598B2 (en) * | 1984-12-20 | 1988-12-01 | Screenex Wire Weaving Manufacturers (Proprietary) Limited | Screens |
DE3544752C1 (en) * | 1985-12-18 | 1990-12-06 | Steinhaus Gmbh | Process for the production of sieve components of different lengths for system sieve floors and sieve components |
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 (en) * | 1993-12-21 | 1997-02-13 | Nilos Gmbh | Screening device |
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 |
US6957741B2 (en) | 2001-08-07 | 2005-10-25 | Manfred Franz Axel Freissle | Screening arrangement |
US20030082722A1 (en) * | 2001-08-08 | 2003-05-01 | Bingliang Fang | Method for amplifying expression from a cell specific promoter |
WO2003057376A1 (en) * | 2002-01-08 | 2003-07-17 | Rcm Plastics Cc | A screening element |
US7788867B2 (en) * | 2004-10-13 | 2010-09-07 | General Electric Company | Floor tile debris interceptor and transition plenum in a nuclear power plant |
CA2573726C (en) * | 2006-01-13 | 2014-10-21 | Johnson Screens (Australia) Pty Ltd. | A screening module |
AU2007200082B2 (en) * | 2006-01-13 | 2010-09-30 | Flsmidth A/S | A screening module |
US7753213B2 (en) * | 2006-03-30 | 2010-07-13 | M-I Llc | Composite screen |
US20080067113A1 (en) * | 2006-06-30 | 2008-03-20 | Helmy Nashat N | Sifting screen and method of manufacture |
US8167134B2 (en) * | 2006-06-30 | 2012-05-01 | Tandem Products, Inc. | Sifting screen structure |
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 |
CA2623992C (en) * | 2008-02-15 | 2011-02-08 | Screenex Manufacturing (Pty) Ltd. | Screen panels |
GB0823402D0 (en) * | 2008-12-23 | 2009-01-28 | United Wire Ltd | Improved sifting screen |
WO2012029072A1 (en) * | 2010-09-01 | 2012-03-08 | Tega Industries Limited | Screen panel with improved apertures |
EP2796211B1 (en) | 2013-04-25 | 2015-06-10 | Sandvik Intellectual Property AB | Screening media |
PL232751B1 (en) | 2013-08-12 | 2019-07-31 | Int Tobacco Machinery Poland Spolka Z Ograniczona Odpowiedzialnoscia | Assembly for separation and method of separation of selected defective objects from the group of objects used in tobaco industry |
US10987676B2 (en) | 2015-08-21 | 2021-04-27 | Quadro Engineering Corp. | High efficiency conical mills |
USD832970S1 (en) * | 2017-03-08 | 2018-11-06 | Yi Huei Jen | Perforated plate for firearms |
CN109277294B (en) * | 2018-12-10 | 2023-08-04 | 金陵科技学院 | Double-deck shale shaker of antiseized board |
CN116764954B (en) * | 2023-08-17 | 2023-10-24 | 云南凯瑞特工程机械设备有限公司 | Vibrating screen for heavy screening station |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB425877A (en) * | 1934-09-13 | 1935-03-22 | Louis Herrmann | Improvements in or relating to sifting and screening grates or sieves |
DE975500C (en) * | 1952-11-23 | 1961-12-14 | Brueckenbau Flender G M B H | Sieve bottom made of a large number of juxtaposed grafted sieve wires |
DE965546C (en) * | 1953-05-21 | 1957-06-13 | Brueckenbau Flender G M B H | Sieve bottom |
US2870910A (en) * | 1954-03-15 | 1959-01-27 | Brueckenbau Flender Gmbh | Screen for use in oscillating screening devices |
GB883176A (en) * | 1958-06-24 | 1961-11-22 | Gerhard Hopper | Improvements in or relating to wire screens |
DE1214981B (en) * | 1961-05-27 | 1966-04-21 | Finanzierung G M B H | Screen covering for vibrating screens |
DE1197310B (en) * | 1964-02-15 | 1965-07-22 | Ruhrkunststoff G M B H | Sieve with elastic rubber or plastic sieve covering |
GB1343431A (en) * | 1970-01-21 | 1974-01-10 | Bba Group Ltd | Screens |
DE2108854A1 (en) * | 1971-02-25 | 1972-08-31 | Stahlgruber Otto Gruber & Co, 8000 München | Riddle floor - of elastic material gratings reinforced with cross bars |
DE2258123A1 (en) * | 1972-11-28 | 1974-05-30 | Walter Dr-Ing Kiefer | Metal reinforced plastic sieves and bar screens - of improved chemical and wear resistance |
DE2532375C3 (en) * | 1975-07-19 | 1981-11-12 | Gustav Schade Maschinenfabrik Gmbh & Co, 4600 Dortmund | Sieve plate |
US4120785A (en) * | 1976-02-23 | 1978-10-17 | Mitsuboshi Belting Limited | Rubber screens for vibratory screening apparatus |
JPS5847236B2 (en) * | 1976-09-07 | 1983-10-21 | 株式会社ブリヂストン | Rubber screen with excellent durability |
DE2701307B1 (en) * | 1977-01-14 | 1978-05-03 | Schenck Ag Carl | Perforated screen base for vibrating screens |
CA1102282A (en) * | 1977-08-10 | 1981-06-02 | Hunter Wire Products Limited | Snap-fitting screening module for longitudinal supports |
US4222865A (en) * | 1979-02-16 | 1980-09-16 | Irathane Systems Incorporated | Trommel screen unit |
-
1980
- 1980-02-20 DE DE3006364A patent/DE3006364B1/en not_active Ceased
- 1980-12-01 US US06/314,095 patent/US4563270A/en not_active Expired - Fee Related
- 1980-12-01 WO PCT/EP1980/000141 patent/WO1981002398A1/en not_active Application Discontinuation
- 1980-12-01 EP EP80902287A patent/EP0052098B1/en not_active Expired
- 1980-12-01 JP JP56500124A patent/JPS57500093A/ja active Pending
- 1980-12-01 BR BR8009095A patent/BR8009095A/en unknown
- 1980-12-01 AU AU65730/80A patent/AU538559B2/en not_active Expired
-
1981
- 1981-02-19 CA CA000371296A patent/CA1157426A/en not_active Expired
- 1981-02-19 ZA ZA00811106A patent/ZA811106B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8102398A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3006364B1 (en) | 1980-11-13 |
AU538559B2 (en) | 1984-08-16 |
CA1157426A (en) | 1983-11-22 |
JPS57500093A (en) | 1982-01-21 |
AU6573080A (en) | 1981-09-11 |
BR8009095A (en) | 1982-06-01 |
EP0052098B1 (en) | 1984-05-16 |
US4563270A (en) | 1986-01-07 |
WO1981002398A1 (en) | 1981-09-03 |
ZA811106B (en) | 1982-03-31 |
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Legal Events
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