EP0681514A1 - Screen, accessory for screen and screening process. - Google Patents
Screen, accessory for screen and screening process.Info
- Publication number
- EP0681514A1 EP0681514A1 EP94905709A EP94905709A EP0681514A1 EP 0681514 A1 EP0681514 A1 EP 0681514A1 EP 94905709 A EP94905709 A EP 94905709A EP 94905709 A EP94905709 A EP 94905709A EP 0681514 A1 EP0681514 A1 EP 0681514A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixing
- screening
- sieve
- screening device
- main flow
- 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
- B07B1/50—Cleaning
- B07B1/52—Cleaning with brushes or scrapers
- B07B1/522—Cleaning with brushes or scrapers with brushes
- B07B1/524—Cleaning with brushes or scrapers with brushes the brushes being rotating
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/50—Cleaning
- B07B1/54—Cleaning with beating devices
-
- 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
- B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
- B07B13/14—Details or accessories
- B07B13/16—Feed or discharge arrangements
Definitions
- Screening device additional device for a screening device and screening method
- the invention relates to a screening device, an additional device for a screening device, and a screening method.
- the effectiveness of screening devices depends on the movement of the fine-grain fraction in the screenings.
- the ideal solution would be to guide the screenings, in which every undersize is given the opportunity to hit a screen opening and fall through.
- vibrating sieves are used, for example linear vibrating sieves.
- the classification of the material to be sieved i.e. the sieving process itself is designed to be more effective and efficient.
- EP-B1-0 015 633 it is proposed, for example, to move the material to be screened over it in the case of a flat screen surface that can be set in linear vibrations, whereby on the screenings traveling on the screen in a main flow direction is acted on at several successive points by means of mechanical links.
- the so-called mechanical members consist of congestion members arranged transversely to the main flow direction, which are formed in the manner of a baffle plate or dust board. These can also be designed as so-called "hanging swing doors" that can be opened by the screenings in the direction in which they are conveyed.
- the screenings traveling over the screen surface Prior to each accumulation stage, the screenings traveling over the screen surface are to be dammed up, a backward flow overlying the main flow of the items being created in the accumulation area .
- the object of the present invention is to provide an improved screening device and an additional device for increasing the screening efficiency as well as an improved method for screening.
- the present invention creates a possibility of actually significantly improving the mixing of the material during the sieving process, which - as has been shown - is actually the essential prerequisite for the sieve efficiency to be compared to conventional solutions can be increased significantly.
- the screening device is therefore equipped with a so-called compulsory mixer.
- the material to be screened is subjected to a mixture which increases the efficiency of the sieve, that is to say a compulsory mixture, during the sieving process and during its movement along a main flow direction.
- Sections or areas of the screenings moving along the main flow direction are mixed so that they deviate from the main flow direction in such a way that the proportion of fine grain in the immediate vicinity of the sieve opening is increased again, so that the sieving efficiency is improved.
- Mixing or compulsory mixing therefore means nothing else than that at least one during the sieving process or preferably several places, the material to be screened is moved and mixed again and again in sections and possibly also differently with different movement components and / or intensity.
- the different areas of the material to be mixed during the mixing process are at least partially and / or temporarily also with a movement component in the transverse direction of the main flow direction, with a component also in the backward flow direction, if necessary, with a movement component in from the sieve surface upwards circulated upwards or towards the screen surface of the downwardly directed component and thus ultimately mixed independently or essentially independently of the main flow direction.
- one or more mixers also referred to below as compulsory mixers, may be provided which, for example, have the axial direction transverse (perpendicular or oblique) to the main conveying direction of the screen material, the entire or essentially the entire width of the screen Loosen and layer the material layer by mixing.
- the mixing elements attached to the shaft can be designed as paddles, plows or disks or in some other suitable form.
- the direction and speed of rotation can be determined empirically and optimized.
- the mixing device can participate in the oscillating movement of the screen or can preferably be connected to the fixed screen frame.
- the distance between the mixer and the sieve can be adjusted in such a way that a sieve that swings up or down, for example, knocks against the mixing elements and the sieve openings are thereby kept free.
- Moving the mixing element means nothing else, that by accelerating the sieve downwards the in the sieve mesh particles (so-called fish) are loosened and removed by their inertia from the sieve openings.
- the mixer or compulsory mixer (with its shaft) can also be installed parallel to the main conveying direction of the material to be sieved, which can then be pushed back or forth across the width of the sieve by a suitable device or is moved, the mixer shaft rotating at a suitable speed and possibly alternating direction.
- the screening device which is in particular equipped with a vibrating screen, can be equipped with one or more circular mixers, preferably with plow mixing elements.
- Such circular mixers can also be used in rotary screens.
- the screen surface can in principle also remain stationary, the transport of the material to be screened over the screen surface being carried out or supported by suitably designed positive mixers. Either the screen surface is inclined. It is also possible (alternatively or additionally) that the compulsory mixers convey on the principle of a screw.
- a certain improvement can also be achieved with static mixers.
- sieving efficiency can be achieved.
- one or more bridges are installed vertically or diagonally in the main conveying direction above the screened material, to which, for example, plowshares are installed in a mirror image, for example parallel and, for example, to the center line of the screen, which shovel and loosen the screened material towards the center. This also results in a shift.
- the material to be screened is shifted (and loosened) in such a way during its main flow movement that a higher proportion of fine particles of the material to be screened is brought to the screen openings and thus the sieve efficiency can be improved.
- Figure 1 is a side view of a vibrating screen
- FIG. 2 a top view of the device shown in FIG. put vibrating sieve
- FIG. 3 shows a vibrating sieve in a top view in an embodiment example modified from FIGS. 1 and 2;
- Figure 4 shows another embodiment of a screening device according to the invention in plan view with rotating mixer bars with plowshare;
- FIG. 5 shows a side view of a rotating mixer bar shown in FIG. 4 above the sieve
- FIG. 6 shows a further top view of a modified exemplary embodiment with a static mixing device
- FIG. 7 shows a transverse view along the main flow direction of the static mixing device according to FIG. 6;
- FIG. 8 shows a schematic vertical cross-sectional representation through a circular sieve
- FIG. 9 shows a schematic top view of the exemplary embodiment according to FIG. 8.
- FIG. 1 shows a schematic representation of a screening device with two mixing devices 5 arranged offset in the main flow direction 1 of the material to be screened 3 in a first exemplary embodiment in side view and in FIG. 2 in top view.
- the screenings 3 is from an inlet end 7 via the Sieve 9, ie the sieve surface 9 'moves to an outlet end 11. It is preferably a vibrating sieve, preferably a sieve provided with a linear vibration exciter, also called a vibrating or vibrating sieve for short. As shown in FIG. 1, the screen can be inclined from its inlet end to its outlet end 7, 11 at an angle of, for example, more than 3 ° and preferably less than 25 ° or 15 °.
- a shaft or mixer shaft 17 is arranged on the frame 13 of the screening device, on the side frame 13 'on lateral columns or supports 15, which runs horizontally at the same distance transversely, i.e. runs obliquely or perpendicular to the main conveying or longitudinal direction 1 of the screen.
- the motor drive device is not shown in detail.
- mixing members 19 are arranged in three rows offset in the U direction along the longitudinal direction of the shaft 17 in discrete steps.
- the individual plate, shovel, sheet or sheet metal strips, paddle or plow-shaped or other forms of mixing elements 19 are provided, which rotate clockwise or counterclockwise when the shaft rotates in the illustration according to FIG clockwise or with changing direction of rotation and rotate.
- the material to be screened is not only loosened on its way along the main flow direction 1, when it passes through the mixing device 5 in question, but in particular layered, that is to say mixed, in particular.
- the corresponding areas of the material to be screened 3 are varied with render motion and mixing component in deviation from the main flow direction 1, for example obliquely to the front, obliquely to the rear or in a right-angled transverse direction or in the reverse direction, i.e. generally shifted and mixed in the longitudinal and transverse directions in the superimposed direction of the material to be screened.
- the mixing elements are arranged in discrete steps on the respective mixer shaft or the mixing element carrier, passage paths through the mixing elements also result continuously during the mixing, which increases the mixing effect.
- different sections of the at least one mixing element, or in the sense of the exemplary embodiments shown, several, for example, shovel or plow-type mixing elements, are immersed in the screenings to be mixed, with these mixing elements and the different locomotion and, if appropriate, rotation speeds - the mixing elements optimally mix and layer the material to be sieved and the material to be sieved can pass between two adjacent mixing elements during the further drive movement of the mixing elements. This results in a kind of "rake or ploughshare effect".
- This interrupted or offset arrangement of the mixing elements also ensures that the mixing elements themselves generally advance the advancing movement of the screened material towards its end of flow is still possible and is not stowed in the sense of a barrier and barrier by the mixing organs themselves.
- the radial length of the mixing operations can be dimensioned such that, when rotating, the front radial ends of the mixing elements touch the screen surface 9 ', ie tap them on the screen surface 9' and book them down and bend at least slightly quickly and suddenly, or at least briefly , with this sudden knocking the particles closing the mesh openings are thrown upwards out of their mesh openings due to their inertia.
- a mixing device 5 is provided, the shaft 17 of which deviates from FIGS. 1 and 2 in the longitudinal direction of the sieve, i.e. is provided running in the direction of the main flow direction 1, the shaft 17 being suspended transversely on the opposite ends in the area of the inlet and outlet ends 7, 11 on a bridge running above the sieve 9 and the material to be sieved 3.
- the mixing device 5 is moved transversely to the main flow direction 1 from the left to the right edge of the sieve 9 and vice versa in accordance with the arrow representation 21 in order to optimally shift the material to be sieved again and again during the forward movement along the main flow direction 1 by the mixing elements 19 and to see through.
- a rotating mixer bar 25 is shown rotatably suspended in a main carrier direction 1 above the sieve surface 9 ', offset from the screen surface 9', which is connected to the frame 13, with its longitudinal direction offset ⁇ sheet metal, shovel etc. shaped mixing elements 19 protruding below are attached.
- the mixer bar 15 rotates about a vertical axis 27 - ie generally about an axis 27 which is perpendicular to the screen surface 9 '.
- the drive elements for this are not shown in detail.
- the material to be screened is again adequately shifted along its forward movement in the main flow direction 1 , loosened up, ie completely mixed with different movement components.
- a screening device with a static mixing device 5 is shown.
- two fastening bridges 31 are again mounted between the side frames 13 'above the sieve surface 9', on which in turn the projection-like or ploughshare-like and arched mixing elements 19 protruding downwards in FIG. 7 project and protrude are brought.
- the screenings moving along the main flow direction 1 are intended, for example, through an inclined screen surface (and above all using an oscillating or vibrating screen) ) when passing through the mixing device formed in this way, again shifted and mixed accordingly.
- This two-stage forced mixing also increases the sieving effect.
- the radially protruding ends of the mixing elements 19 do not touch the actual sieve 9, but rather run past the sieve surface 9 'at a preferably small distance during the rotational movement.
- the distance can be varied and optimized according to the type of material to be screened as required. Distances of around 1 cm are sufficient. Improved the effect - as explained - when the radial ends of the mixing elements hit the sieve surface from above at least briefly during circulation, so that after the sieve surface is pivoted back into the starting position, the particles sitting in the sieve openings can be thrown out.
- the various rows with the mixing elements 19, which are offset, for example, by 90 ° or 120 ° in the circumferential direction, can be aligned at the same distance, but offset in individual rows from one another.
- the mixing elements in the longitudinal direction of the shaft 17 in question can only be provided offset at the same point in the circumferential direction.
- the material to be screened is fed along the arrow 35 to a funnel-shaped inlet end 7 arranged in the center of the circular screen 9 above the screen 9.
- the outlet end 11 for the material to be screened is defined by the circumference, i.e. the outer boundary of the screen 9 is formed.
- the portions of the material to be screened which are not screened through the screen opening can flow outwards into a separate chamber (not shown further).
- the entire sieve arrangement with the funnel-shaped inlet end 7 accessible in the middle from above can be covered by a cover 41 which, for example, together with the funnel-shaped inlet end 7 and the co-rotating device 5 housed therein.
- a cover 41 which, for example, together with the funnel-shaped inlet end 7 and the co-rotating device 5 housed therein.
- two fastening bridges 31 are provided for the mixing device 5, which are connected radially on the inside to the funnel 43 forming the inlet end 7 and at their radially outer end to the cover 41 and rotate together with the latter about a central vertical central axis 45 .
- the mixing element rotates about the vertical axis of rotation and symmetry 45, the sieve being permanent during its migration from the center to the outer circumference (discharge end 11), that is to say along its main flow direction 1, which runs radially from the center to the outside, due to the rotation of the mixing device is shifted and optimally mixed, the sieve effect being improved.
- the so-called horizontal and radial mounting bridges can also be designed as rotating shafts, so that a superimposed rotational movement around a vertical axis of symmetry perpendicular to the screen surface 9 'and also around the radially projecting ones carrying the mixing elements 19 Mixing member support arms rotate.
- the lower ends of the mixing members 19 could also "tap" again on the screen surface in order to counteract possible blockages.
- a so-called interrupted screw can also be used as such a mixing element, for example, the axis of rotation of which is arranged comparable to the orientation and position of the bridges 31, and which then also rotate additionally around the vertical axis of symmetry perpendicular to the screen surface 9 '.
- a snail or interrupted snail can also be found in the other Examples are used.
- a vibrating or vibrating sieve (vibrating sieve) is generally also used, a circular oscillation or vibration being able to be generated here, via which the material to be washed radially from its central inlet end 7 drifts along the main flow direction 1 on the outside with increasingly low screen material height.
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4302360A DE4302360A1 (en) | 1993-01-28 | 1993-01-28 | Mixing devices for sieves |
DE4302360 | 1993-01-28 | ||
PCT/EP1994/000211 WO1994016827A1 (en) | 1993-01-28 | 1994-01-26 | Screen, accessory for screen and screening process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0681514A1 true EP0681514A1 (en) | 1995-11-15 |
EP0681514B1 EP0681514B1 (en) | 1997-03-19 |
Family
ID=6479129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94905709A Expired - Lifetime EP0681514B1 (en) | 1993-01-28 | 1994-01-26 | Screen, accessory for screen and screening process |
Country Status (4)
Country | Link |
---|---|
US (1) | US5915567A (en) |
EP (1) | EP0681514B1 (en) |
DE (2) | DE4302360A1 (en) |
WO (1) | WO1994016827A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120299270A1 (en) * | 2011-05-24 | 2012-11-29 | Joseph Vogele Ag | Pushing device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8608096B2 (en) * | 2009-02-18 | 2013-12-17 | Basf Se | Method for the production of water-absorbing polymer particles |
US9403193B1 (en) * | 2015-05-29 | 2016-08-02 | Charles A. Picard, Jr. | Roller apparatus |
Family Cites Families (32)
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DE111461C (en) * | ||||
US240163A (en) * | 1881-04-12 | Middlings-purifier | ||
US542093A (en) * | 1895-07-02 | Bolting-cloth brush | ||
US175286A (en) * | 1876-03-28 | Improvement in pulp-screen cleaners | ||
US202727A (en) * | 1878-04-23 | herman | ||
GB189621453A (en) * | 1896-09-28 | 1897-04-24 | George Frederick Redfern | Improvements in Crushing or Amalgamating Mills. |
US630926A (en) * | 1898-03-05 | 1899-08-15 | T C O Donovan | Mineral-separator. |
US1647696A (en) * | 1924-11-27 | 1927-11-01 | Franz J Hermann | Thrashing machine |
GB518539A (en) * | 1938-08-25 | 1940-02-29 | Charles Herbert Griffiths | Improvements in and relating to sieves |
US3252573A (en) * | 1962-11-28 | 1966-05-24 | Assinck Joseph John | Cleaning device for vibrating screens |
DE1186308B (en) * | 1963-02-07 | 1965-01-28 | Jaroslav Ruzicka | Vibration screening device, especially for fine fractions |
DK103543C (en) * | 1964-03-25 | 1966-01-17 | Dano Ingenioerforretning & Mas | Cleaning means for laying on the surface of screens or conveyors operating by vibration or vibration effects, and suspension means for such cleaning means. |
US3304064A (en) * | 1965-10-11 | 1967-02-14 | Westinghouse Air Brake Co | Shaker mixing conveyor |
DE1266115B (en) * | 1966-07-09 | 1968-04-11 | Kloeckner Humboldt Deutz Ag | Device for sieving goods containing croissants and bales |
DE1930404A1 (en) * | 1969-06-14 | 1970-12-17 | Krupp Gmbh | Conveyor belt |
US3863765A (en) * | 1972-05-08 | 1975-02-04 | Eric G Gray | Anti-blinding wiper assembly for vibratory separator |
GB1462038A (en) * | 1973-02-15 | 1977-01-19 | Whinfrey A F | Dust extraction apparatus |
SU498971A1 (en) * | 1974-02-28 | 1976-01-15 | Предприятие П/Я А-7587 | Screening device |
DE3060512D1 (en) * | 1979-03-05 | 1982-07-29 | Buehler Ag Geb | Process for sorting grain or seed material and sorting plant |
JPS55165116A (en) * | 1979-06-11 | 1980-12-23 | Ando Screen Seisakusho:Kk | Brush driving device of screen for solid-liquid separation |
US4736044A (en) * | 1979-06-20 | 1988-04-05 | Amoco Corporation | Boron compounds to inhibit formation of tar during the "ene" reaction of an ethylenically unsaturated alpha, beta dicarboxylic acid compound and an ethylenically unsaturated hydrocarbon |
US4265151A (en) * | 1979-07-31 | 1981-05-05 | Owens-Corning Fiberglas Corporation | Apparatus for removing long strands from chopped strand material |
IT1133933B (en) * | 1980-10-16 | 1986-07-24 | Adriano Barbieri | APPARATUS TO BREW, SELECT, CLASSIFY GRANULAR PRODUCTS IN GENERAL |
DE3210290A1 (en) * | 1982-03-20 | 1983-09-29 | Rhewum Rheinische Werkzeug- Und Maschinenfabrik Gmbh, 5630 Remscheid | Screening machine |
FI71239C (en) * | 1982-04-07 | 1986-12-19 | Vilppu Uolevi Rissanen | SAOLLNINGSFOERFARANDE OCH -ANORDNING |
EP0159618B1 (en) * | 1984-04-27 | 1988-01-07 | MIRA LANZA S.p.a. | Apparatus for uniformly distributing a disintegrated fibrous material on a fiber layer forming surface in plants for the dry forming of paper |
DE3504994A1 (en) * | 1985-02-14 | 1986-08-14 | Philipp 6097 Trebur Mähn | Shaking screening machine for compost |
DE8701829U1 (en) * | 1987-02-06 | 1987-06-11 | Gebr. Bütfering Maschinenfabrik GmbH, 4720 Beckum | Device for separating organic parts from soil |
DE3720490A1 (en) * | 1987-06-20 | 1988-12-29 | Kapuschinski Hannes J | Screen device |
SU1544507A1 (en) * | 1988-04-25 | 1990-02-23 | Центральный Научно-Исследовательский И Проектно-Технологический Институт Механизации И Электрификации Животноводства Южной Зоны Ссср | Apparatus for cleaning loose fodder |
SU1567285A1 (en) * | 1988-07-05 | 1990-05-30 | Государственный проектно-конструкторский институт "Гипромашуглеобогащение" | Sieve |
SU1717262A1 (en) * | 1990-01-31 | 1992-03-07 | Ленинградское научно-производственное объединение строительного и коммунального машиностроения | Drum screen cleaning device |
-
1993
- 1993-01-28 DE DE4302360A patent/DE4302360A1/en not_active Withdrawn
-
1994
- 1994-01-26 WO PCT/EP1994/000211 patent/WO1994016827A1/en active IP Right Grant
- 1994-01-26 DE DE59402150T patent/DE59402150D1/en not_active Expired - Fee Related
- 1994-01-26 EP EP94905709A patent/EP0681514B1/en not_active Expired - Lifetime
- 1994-01-26 US US08/861,767 patent/US5915567A/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO9416827A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120299270A1 (en) * | 2011-05-24 | 2012-11-29 | Joseph Vogele Ag | Pushing device |
US9145649B2 (en) | 2011-05-24 | 2015-09-29 | Joseph Vogele Ag | Pushing device |
Also Published As
Publication number | Publication date |
---|---|
EP0681514B1 (en) | 1997-03-19 |
DE59402150D1 (en) | 1997-04-24 |
WO1994016827A1 (en) | 1994-08-04 |
US5915567A (en) | 1999-06-29 |
DE4302360A1 (en) | 1994-08-04 |
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