EP2532445A2 - Crible - Google Patents

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Publication number
EP2532445A2
EP2532445A2 EP12004327A EP12004327A EP2532445A2 EP 2532445 A2 EP2532445 A2 EP 2532445A2 EP 12004327 A EP12004327 A EP 12004327A EP 12004327 A EP12004327 A EP 12004327A EP 2532445 A2 EP2532445 A2 EP 2532445A2
Authority
EP
European Patent Office
Prior art keywords
screen
screening
shaft
shafts
discs
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.)
Withdrawn
Application number
EP12004327A
Other languages
German (de)
English (en)
Other versions
EP2532445A3 (fr
Inventor
Andreas Farwick
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.)
Terra Select GmbH and Co KG
Original Assignee
Terra Select GmbH and Co KG
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 Terra Select GmbH and Co KG filed Critical Terra Select GmbH and Co KG
Publication of EP2532445A2 publication Critical patent/EP2532445A2/fr
Publication of EP2532445A3 publication Critical patent/EP2532445A3/fr
Withdrawn legal-status Critical Current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
    • B07B1/50—Cleaning
    • B07B1/52—Cleaning with brushes or scrapers
    • B07B1/526—Cleaning with brushes or scrapers with scrapers
    • B07B1/528—Cleaning with brushes or scrapers with scrapers the scrapers 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
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
    • B07B1/155—Roller screens using corrugated, grooved or ribbed rollers the rollers having a star shaped cross section

Definitions

  • the present invention relates to a screening device and a screening machine with a screening device for the screening of particular biomass and similar bulk materials or the like.
  • the screening machine and the screening device can be used for a wide variety of purposes.
  • One possible field of application is the screening of biomass for thermal utilization. In the combustion of biomass for heat or energy production, it is necessary to screen off the resulting biomass to supply the desired grain size fraction of the incinerator, while, for example, sand or similar particles are screened out beforehand, for. B. to reduce the ash content. Often it is still useful to sort out too large pieces to ensure a homogeneous and uniform combustion or to prevent disturbances in the conveyors of the incinerators.
  • screen stars are mounted on parallel sieve shafts, which consist of elastic materials and projecting radially outward from the shaft sieve fingers exhibit. Due to the elasticity of the sieve fingers, the individual fingers can dodge flexibly if necessary.
  • the screen stars of a screen shaft each engage in spaces between the screen stars of an adjacent screen shaft. During operation, the screen shafts rotate, thus conveying the material to be screened along the screening deck. Material to be sifted passes between the individual sieve fingers and is transported predominantly downwards by the rotation of the screen stars below the sieve deck if the material picked up between the fingers has sufficiently small dimensions.
  • disc screens or disc separators have become known in which a plurality of parallel arranged in a frame rotatably driven shafts are provided on which a plurality of discs are arranged in gap and interlocking.
  • a screen is for example also from the EP 0861696 A1 known.
  • Scheibensieb or Scheibenseparator the arranged on the waves polygonal discs made of a ferrous material. Partial surfaces of the disk body are provided with an armor made of hard metal to increase the service life.
  • this known disk screen is basically also suitable for separating heavy screenable masses.
  • Biomass is often a substance that is difficult to screen and has as well cohesive screenings also have a tendency to settle on the discs or on the shaft hubs and build up.
  • Metallic sieve discs enable the targeted screening of fine products.
  • a disadvantage is that in the screening of cohesive materials it can lead to increased adhesion of Siebguts to the discs and / or shaft hubs, which can lead to a lower screening performance and possibly to a blockage of the screen, if the required drive power above the Available drive power is.
  • the screening device comprises a plurality of adjacent and rotatably arranged screening shafts, on each of which a plurality of sieve discs made of substantially rigid materials is arranged.
  • the screen discs are separated from each other in the axial direction by a gap.
  • Sieve disks of a screen shaft engage in interspaces of the screen disks of adjacent screen shafts. At least half of the screen disks at least one cleaning device for cleaning the spaces between the screen disks of adjacent screen shafts is provided.
  • the screening device according to the invention has many advantages.
  • a significant advantage of the screening device according to the invention is that the screen discs consist of substantially rigid materials.
  • the screen discs are made of metallic materials, but they may also consist of inelastic plastics.
  • rigid materials By the construction of rigid materials, a more precise construction can be ensured, which also enables the screening of fine and finest fractions from biomass.
  • the cleaning device preferably comprises at least one and in particular exactly one extended cleaning tooth or is designed as such.
  • an extended cleaning tooth for cleaning the spaces between the screen discs of adjacent screen waves is provided.
  • the extended cleaning tooth allows an almost full-surface cleaning of the sides of the screen discs.
  • the axial width of the cleaning tooth is preferably at least twice the axial thickness of the screen disc and in particular more than three times the disc thickness.
  • cleaning teeth may be provided at the terminal screen disks of a screen shaft, which have a smaller axial width.
  • a cleaning device comprises two or more extended cleaning teeth.
  • the at least two cleaning teeth are preferably arranged angularly offset on the screen disk. If two cleaning teeth are provided, it is possible that each cleaning tooth projects substantially only on one side of the screen disk. It is also possible for at least one cleaning tooth of the at least two cleaning teeth not to be arranged axially in the middle of the screen disk. As a result, the cleaning tooth projects with a larger area on one side of the screen disk.
  • the at least two extended cleaning teeth of a screen disk are arranged such that they substantially cover the space to be cleaned between the screen disks of adjacent screen shafts.
  • Such a design with two substantially half cleaning teeth is particularly advantageous because the complement at least two cleaning teeth in their cleaning effect and thereby the load acting on a cleaning tooth is reduced. Also foreign objects can be easily pushed out of the spaces between the sieve discs of adjacent sieve shafts. In particular, a blockade of individual screen waves or the entire screening device is reliably avoided.
  • the screen discs of the screening device are arranged to rotate in the same direction.
  • the material to be screened is transported away from the feed point while simultaneously being screened.
  • the cleaning devices are provided only on the screen discs about half of the screen shafts. This means that in an even number of sieve shafts exactly half of the screen shafts cleaning devices are provided. Since cleaning devices are only provided on every second screen shaft, cleaning devices are then provided on each screen disk of the corresponding screen shaft, while the screen disks of the other half of the screen shafts have no cleaning device.
  • the number of sieve shafts equipped with sieve discs with a cleaning device may correspond to the rounded-off half of the total number of sieve shafts.
  • the total number of screen discs provided with cleaning means may also be slightly larger or slightly smaller than half of the screen discs as a whole.
  • sieve devices with an even number of sieve shafts are particularly preferably provided, so that the number of sieve discs provided with cleaning devices is 50% +/- 5% and in particular exactly 50%.
  • At least one screening unit which comprises a plurality of adjacent and in particular four adjacent screening shafts. If the sieve unit comprises four adjacent sieve shafts, cleaning devices are preferably arranged only on the sieve disks of the two middle sieve shafts. Such a configuration offers considerable advantages, since the cleaning devices of the screen disks of the two middle screen shafts can clean all interstices of the screen unit. As a result of the rotation of the cleaning devices, the spaces between the sieve disks of the outer screen shafts are also cleaned.
  • adjacent screen shafts of a screen unit at different speeds. Due to the fact that adjacent screen shafts of a screen unit have different rotational speeds during operation, it is ensured that not only the same location is swept by the cleaning device, but that during cleaning the cleaning device clears the gap between two screen disks over the entire circumference.
  • the different rotational speeds ensure that the cleaning device cleans a different circumferential point of the corresponding gap with each revolution. After just a few revolutions of the sieve shafts, the entire circumference is cleaned, so that an accumulation of an adhering product layer can be reliably prevented.
  • the individual screen shafts of one or more screening units are driven in a coupled manner.
  • the individual screen shafts can be connected to one another via chain drives.
  • the number of teeth of the individual pinion defined speed ratios of the individual sieve shafts can be guaranteed.
  • slip is avoided by a chain drive, so that at any time defined angular positions of the individual screening shafts are ensured. This ensures that the cleaning devices of the two middle adjacent screen shafts do not collide with each other.
  • the dimensions of the extended cleaning teeth are adjusted to the speed ratios of the adjacent cleaning waves, that a complete cleaning of the gap between two screen discs is ensured while avoiding a collision of the cleaning teeth of the adjacent screen shafts.
  • a speed ratio of two adjacent screen shafts of a screen unit between 7: 6 and 5: 2 is advantageous.
  • a speed ratio of 4: 3 fixed.
  • the two intermeshing cleaning devices of the middle screen shafts in each case engage behind, if they have the smallest distance.
  • the same constellation occurs every 4 or 3 revolutions.
  • the rotational speeds of the screen waves increase or decrease in the transport direction of the screening material to be screened off.
  • the screening shafts of a second screening unit can have higher rotational speeds than the screening shafts of a first screening unit, wherein the speed ratios of the individual screening shafts in the individual screening units can be constant.
  • An increasing rotational speed of the screen waves in the transport direction of the screening device can be useful, for example, to achieve a screening result that is constant over the screen surface.
  • the shaft speed can be increased from the beginning of the Siebumble towards the end. For other materials or constellations, the same speeds or even speed reductions may make sense. By varying the rotational speed over the sieve length, such factors can be compensated.
  • the screen discs and / or the cleaning devices are made of metal.
  • the cleaning devices and / or the cleaning teeth preferably have at least one armor layer in order to reduce wear. Also possible is a suitable plastic or ceramic material.
  • At least one screen disc has at least one lateral recess and / or at least one axial through hole.
  • Through axial through holes on at least one screen plate possible adhesions can be reduced to the screen discs.
  • the total weight of the screening device is not significantly reduced. This is particularly - but not only - in transportable screening or screening machines advantage.
  • the rotating mass is reduced, causing lower loads are applied to the drive and bearing elements. Therefore, a lower energy requirement is realized thereby.
  • At least one screen shaft is designed as a polygonal tube and in particular as a square tube.
  • At least one screen shaft may comprise an inner massively configured screen shaft and an outer tube or an outer screen tube.
  • the inner cross section of the outer sieve tube is adapted to the outer cross section of the inner sieve tube to ensure a positive connection.
  • a certain play is possible to ensure a simple Aufschiebevorgang.
  • an absolute difference of inner dimension of the outer screen tube to the outer dimension of the inner screen tube of 0.5 mm or 1 mm or 2 mm or the like may be provided. It is also possible and preferred for the inner dimension of the outer screen tube to be greater than the outer dimension of the inner screen tube by between approximately 1% and 10% and in particular between approximately 2% and 5%.
  • the sieve discs are preferably attached thereto.
  • the associated sieve discs are attached.
  • the screen discs can be held on the polygonal tube via positive locking.
  • they can for example still be welded to the polygonal tube.
  • a plurality of mounting aids arranged in the axial direction are provided on at least one screening shaft.
  • Such an assembly aid may for example be designed as a groove or comprise a circumferential ridge or a hole, a depression or a survey or the like.
  • the screen discs are aligned or arranged on the mounting aids.
  • at least one sleeve is arranged in the intermediate space between two screen disks of a screening shaft. The sleeve is in particular firmly connected to a screen disc and preferably welded thereto.
  • the sleeve in particular surrounds the polygonal shaft and serves to avoid adhering screen material on the polygonal shaft.
  • the sleeve may for example have a round outer cross-section.
  • the movement profile of the cleaning devices depends in particular on the speed ratio of adjacent waves and can be formed, for example, as a rounded triangle or rounded quadrilateral. Depending on the speed ratio and rounded Mehrecken outer contours can be provided.
  • the sleeves may for example consist of stainless steel.
  • Stainless steel has the advantage that biomass is usually poorly adhered to. But it is also possible to make the sleeve of other art or natural materials. It is also possible that the sleeve consists of a first material and is provided with an outer layer of a second material. Also possible is an additional coating with Teflon or the like.
  • a deflector is arranged on the screen disk in the circumferential direction in front of the cleaning device.
  • a deflector usually prevents, for example, a foreign object such as a stone or the like from blocking the cleaning device, since the deflector first contacts such a foreign body and thus conveys it to the side. This increases the reliability of the system again.
  • at least one screen disk is designed as a toothed disk having radially outwardly projecting teeth. The teeth of the toothed disc serve to transport the sieved product over the sieve surface and provide a loosening and distribution of the sieved product.
  • the lateral end shafts of the screening device are not provided with cleaning devices.
  • Such a configuration allows a modular structure, since during the assembly of two screening devices on a screening machine, the cleaning devices of a screening unit do not protrude between the screen disks of the screening unit arranged next to it. Since the cleaning devices have only a lateral distance of about 1 or 2 or 3 mm to the adjacent screen disc, while the distance between two screen discs, for example, 10 or 15 mm, this allows a much simpler installation of multiple screening units to each other, as not mounted to 1 millimeter must be, but can be mounted on, for example, 5 millimeters exactly. At the same time, the screen accuracy on the surface is maintained, since the small and exact gap dimensions are maintained there. Because no cleaning devices are provided on the lateral end shafts, consequently, no collision of the cleaning devices can take place there if several sieve units are lined up.
  • a screening device which has a plurality of adjacent screen shafts rotating during operation.
  • a plurality of screen disks spaced apart from one another in each case in the axial direction is arranged in each case.
  • Screen discs of a screen shaft engage in the interstices of the screen discs of an adjacent screening shaft.
  • At predefined axial positions of at least one screen shaft at least one mounting aid for defined mounting of the screen disks is arranged in each case.
  • the axial positions on the screen shaft are defined in each case from an origin point over an integer multiple of an axial distance.
  • the screening device according to the invention has many advantages.
  • a significant advantage of this screening device according to the invention is that accumulating errors are avoided.
  • the mounting positions of the respective screen discs are defined by a respective distance defined by an integer multiple of an axial distance from an origin point. This means that each position is first calculated from an origin point, so that the addition of a large number of tolerances is reliably avoided.
  • a first screen disc is applied to the screen shaft. Following this, a spacer is applied and a second screen disc is pushed on. Thereafter, alternating screen discs and spacers are applied, with the respective position the screen discs by the addition of the axial dimensions of all previously deferred parts results. Even if every single part has a high manufacturing accuracy, this manufacturing accuracy always has a tolerance, so that when "n" deferred parts, the tolerance has ver-n-facht. For 60 screen discs z. B. even at low manufacturing tolerances of, for example, 1/10 millimeters to a possible error of 6 millimeters. If now the screen discs of a first screening shaft are inserted between the screening discs of a second screening shaft, the distances of the screening discs must be correspondingly adjusted manually, which makes the production complicated and expensive.
  • the invention in turn provides a screening device in which an accumulation of different tolerances, errors and manufacturing inaccuracies is fundamentally avoided.
  • the dimensioning and positioning of the individual screen discs does not take place via the positioning of the previously applied screen discs, but in each case absolutely from an origin point. This results in the lateral distance of a screen disc from an axial end of the screen shaft to a basic distance and the added to n times the distance between two screen discs.
  • the maximum error is exactly one thickness tolerance of the screen disc and not 60 times the tolerance of a screen disc, if z. B. 60 screen discs are provided.
  • the assembly aid preferably comprises at least one groove in the screen shaft and in particular in the outer screen shaft or in the outer polygonal tube.
  • the groove may be performed circumferentially around the screen shaft.
  • the mounting aid has individual recesses, grooves or holes on the circumference of the screen shaft. If, for example, a groove, a hole or the like is used as an assembly aid, then all the holes or grooves can be used as an assembly aid even before the sieve disks are installed be introduced into the screening shaft. This can be done for example via an automated manufacturing process in which, for example laser-based corresponding markings or grooves or the like are introduced into the screening shaft.
  • a holding finger is provided at least on a screen disc, which engages in the groove of the screen shaft.
  • the screen disc cooperates with the mounting aid of the screen shaft in the manner of a bayonet closure.
  • At least one support finger is provided on the screen disc, which serves for support on the outer screen shaft.
  • an outer screen shaft and an inner screen shaft are provided, wherein the inner screen shaft is made solid and the outer screen shaft is attached as a screen tube on the inner screen shaft.
  • the inner cross section of the outer screen tube is adapted to the outer cross section of the inner screen shaft.
  • the retaining fingers engage in the example executed as a groove or hole mounting aids in the outer screen tube, but without the wall to pass inward. This ensures that the outer screen tube can be pushed onto the inner screen shaft.
  • a screening machine is equipped with at least one of the screening devices described above.
  • screening machines 100 with screening devices 1 according to the invention are described which are each designed as a toothed disc screen 105.
  • Fig. 1 shows a perspective view of a designed as a mobile screening machine 110 screening machine 100, which can be taken over transport hooks 103 to transport the screening machine 100, for example, with a truck.
  • the portable screening machine 110 may also have wheels and be designed as a trailer or self-propelled.
  • the screening machine 110 off Fig. 1 has a screen deck 104 with two Zahnommensieben 105.
  • the first toothed disc screen 105 is arranged in the feed area, which adjoins the feed bin 102.
  • the Siebdeck 104 is another toothed pulley 105 downstream.
  • the Zahnusionnsiebe 105 is used for screening of sand and similar particles from the sieved mass or biomass.
  • the screened fine material 112 falls downwards and is transported away via the discharge belt 107.
  • Screening shafts not shown in detail with the screen discs 8 and 9 of the toothed disc screen 105 arranged thereon are used to transport the applied material away from the receiving bunker 102 while the fine material 112 is screened off.
  • the coarse material 114 is discharged onto the discharge belt 108 at the end of the second toothed disc sieve 105 and transported away.
  • FIG. 2 is a highly schematic and perspective view of a designed as a fixed screening machine 1 screening machine 100 shown.
  • Thehomsiebende material is abandoned, for example, with a wheel loader in the hopper 102 and passes through the conveyor belt 109 on the screen deck 104, which is equipped with a toothed pulley 105 as a screening device 1.
  • the Zahnusionnsieb 105 will be explained in more detail with reference to the following figures.
  • the fine material 112 such as sand and the like, passes down through the toothed disc 105 and can be removed there, for example, again with a wheel loader or the like.
  • the payload is screened in the second part, while the too large coarse material 114 is delivered at the end.
  • the housing 101 of the screening machine 100 can in principle be of any desired design.
  • Fig. 3 shows in an enlarged plan view formed as Zahnidensieb 105 screen deck 104 of the screening machines Fig. 1 and Fig. 2 .
  • the Zahnusionnsieb 105 includes a plurality of screen shafts 2-5, which are arranged parallel to each other.
  • Each screen shaft 2 - 5 is equipped with a plurality of screen discs 8 or 9, which are axially spaced on the screen shafts 2-5 are provided.
  • a schematically drawn motor 25 serves to drive.
  • the individual screen shafts are rotatably coupled to each other via pinions 30, 31 and chains 26, 27. It can also be provided two or more engines.
  • the Zahnecknsieb 105 consists of several screening units 12 and 13, which are connected in series in the transport direction of the material to be screened.
  • Fig. 4 shows the detail "B" Fig. 3 in a further enlarged view.
  • the total of four waves 2-5 of the sieve unit 12 are shown.
  • the screen shafts 2 and 5 are equipped with screen discs 9, which are designed as toothed disks 29.
  • the middle screening shafts 3 and 4 are provided with screen discs 8, which are designed as toothed disks 28.
  • intermediate spaces 7 are respectively provided in the axial direction of the shafts into which the adjacent sieve discs 8 or 9 of the adjacent sieve shafts dip.
  • a cleaning device 50 here comprises a cleaning tooth 11 as a cleaning agent 10.
  • the cleaning teeth 11 are arranged only on the screen disks 8 of the middle screening shafts 3 and 4. In each case exactly one cleaning tooth 11 is provided on each screen disk 8 of the middle screening shafts 3 and 4. At the screen disks 9 of the outer screening shafts 2 and 5 no cleaning teeth are provided.
  • any number of screening units 12 can be arranged one after the other in order to provide a correspondingly large screening area.
  • the requirements for the assembly accuracy is significantly reduced, without the screening result practically influence.
  • adjacent screening units 12 can be operated at different speeds.
  • Fig. 5 Shown is the screen shaft 4 with the screen discs 8 arranged thereon, which are equipped with cleaning teeth 11.
  • the cleaning teeth 11 serving as cleaning agents 10 leave only small axial distances between the screen disks 9 and the cleaning teeth 11, so that reliable cleaning can be ensured.
  • the screen discs 8 and 9 are arranged in the axial direction 6 each with a defined distance from each other.
  • Fig. 6 shows the outer shaft tube 39, for example, the screen shaft 2.
  • the outer shaft tube 39 here has mounting aids 17 in the form of holes or grooves 18 which are provided at the four corners of the square profile here.
  • the mounting aids are arranged at equal axial distances 22 to each other.
  • the outer shaft tube 39 is a polygonal tube 15th and formed here as a square tube 16 and can serve as an outer shaft tube of the waves 2-5.
  • the inner shaft tube 40 of the individual screen tubes 2 - 5 has an outer contour which is adapted to the inner contour of the outer shaft tube 39, so that after pushing the outer shaft tube 39 on the inner massively executed screening shaft 40, a positive connection is formed.
  • Fig. 7 is a cross section of the outer screen shaft and the outer shaft tube 39 from Fig. 6 shown.
  • the outer shaft tube 39 is received in the mounted state of the inner shaft tube and the inner screen shaft 40.
  • Fig. 8 shows a screen disc 8, which is connected to the outer shaft tube 39.
  • the toothed disc 8 On the inner contour of the toothed disc 8 (and also the toothed disc 9) holding fingers 23 and support fingers 24 are provided. After sliding a toothed disc 8 or 9 on the outer shaft tube 39 and the positioning of the mounting aid 17 in the form of grooves 18, the toothed disc 8 is here clockwise rotated by about 20 degrees until the retaining fingers 23 engage in the mounting aid 17 serving as grooves 18 , The retaining fingers 23 are dimensioned so that they do not or only very slightly protrude inwards. This allows easy sliding onto the inner screen shaft.
  • longitudinal grooves may be provided on the outer surface of the inner screen shaft to allow the sliding of the outer shaft tube 39 on the inner shaft tube.
  • the toothed disc 8 or 9 is welded to the outer tube 39 with a weld 37.
  • timing pulleys 8 rotate in the orientation according to Fig. 8 counterclockwise, so that the loads occurring by the support fingers 24 via the outer shaft tube 39 on the solidly formed screening shaft 40 (FIG. Fig. 7 ) so that high and highest loads can be absorbed and deduced.
  • the rotating teeth 34 of the screen disk 8 designed as a toothed disk 28 cause a turbulence and a transport of the discontinued material to be screened in the longitudinal direction of the screening device 1.
  • the cleaning tooth 11 ensures a cleaning of the intermediate spaces 7 between the individual screen disks.
  • Fig. 9a shows a perspective view of the screen plate 8 Fig. 8
  • the cleaning tooth 11 is designed to be expanded both in the radial direction and in the axial direction and has an axial width which is slightly smaller than the axial distance between two screen disks of a screening shaft.
  • the lateral distance between the cleaning tooth 11 and the screen to be cleaned 8 and 9 is usually about 1 to 1.5 millimeters.
  • the axial width of the cleaning tooth 11 is preferably between about 4 and 25 mm.
  • the radial length is preferably more than 5 mm and can reach 10 mm or 20 mm.
  • the sleeve 20 is fixedly connected to the screen disc 8 and, for example, welded thereto.
  • the sleeve 20 is finished mounted state of the entire screening device 1 only firmly connected to a screen plate 8, and not with the axially adjacent screen disc.
  • the sleeve 20 is not used for positioning the screen discs 8 or 9, but only to prevent caking on the screen shaft 2-5.
  • FIG. 9b another screen plate 8 is shown in perspective.
  • the cleaning device 50 here comprises two cleaning teeth 11, which with a smaller axial width than the cleaning tooth 11 in Fig. 9a are executed.
  • a cleaning tooth 11 protrudes here substantially only to one side of the screen plate 8 or stands out.
  • a cleaning tooth 11 cleans only about half of the interspace of two screen disks 8 or 9 of adjacent screening shafts 2-5. This advantageously reduces the load acting on the cleaning teeth 11 and thus also the wear of the cleaning teeth 11.
  • FIG. 10 and 11 show further embodiments of the sleeves 20, which have a non-circular outer cross-section.
  • the outer contour 21 of the sleeves 20 according to Fig. 10 or 11 is in each case adapted to the movement of the cleaning tooth 11, so that the least possible uncleaned space for caking remains.
  • the relative point of engagement of a cleaning tooth changes with each revolution 11 in the corresponding space 7, so that over time the gap 7 is substantially cleaned over its entire circumference.
  • the corresponding contours are for the ratio of speeds 3: 4 in the 10 and 11 shown.
  • the rotational speeds of the screening shafts 2 to 5 are about 150 revolutions or 200 revolutions / minute. Also possible are larger and smaller speeds.
  • Fig. 12 shows an alternative embodiment of a screening shaft with sieve discs 9, wherein the sieve discs have through holes 14.
  • the through holes 14 reduce the total weight of the screening device 1 considerably. In addition, less area remains for buildup of product to be sifted.
  • an advantageous screening machine with an advantageous screening device whereby a reliable and permanent operation can be ensured by the targeted cleaning of the interstices. Blockages due to adhering screenings can be largely avoided.
  • the assembly is facilitated because the screen discs 8 and 9 are mounted in axially defined positions. By attaching mounting aids defined positions are possible. Furthermore, the energy requirement is reduced.

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  • Combined Means For Separation Of Solids (AREA)
EP12004327.8A 2011-06-07 2012-06-06 Crible Withdrawn EP2532445A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011104860.3A DE102011104860B4 (de) 2011-06-07 2011-06-07 Siebmaschine

Publications (2)

Publication Number Publication Date
EP2532445A2 true EP2532445A2 (fr) 2012-12-12
EP2532445A3 EP2532445A3 (fr) 2013-12-04

Family

ID=46319531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12004327.8A Withdrawn EP2532445A3 (fr) 2011-06-07 2012-06-06 Crible

Country Status (3)

Country Link
US (1) US8640880B2 (fr)
EP (1) EP2532445A3 (fr)
DE (1) DE102011104860B4 (fr)

Cited By (4)

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CN105436087A (zh) * 2015-12-16 2016-03-30 嵊州市利达电器厂 一种用于电机生产的冲片定量筛选机构
EP3165291A1 (fr) * 2015-11-05 2017-05-10 Bollegraaf Patents and Brands B.V. Appareil et procédé de tri de matériau de corde à partir de déchets
CN106733046A (zh) * 2017-01-18 2017-05-31 苏州市高凡生物科技有限公司 一种带滤网疏通机构的有机垃圾破碎装置
CN107199176A (zh) * 2017-07-27 2017-09-26 贵州宏鑫超微新材料有限公司 重晶石筛分组件及生产装置

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DE102010037073B8 (de) * 2010-08-19 2013-09-26 Günther Holding GmbH & Co. KG Siebelement für eine Scheibensiebvorrichtung
DE102013018467B4 (de) * 2013-11-05 2016-07-28 Kompoferm Gmbh Siebmaschine
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US20120312724A1 (en) 2012-12-13
DE102011104860A1 (de) 2012-12-13

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