EP4302883A1 - Dispositif tamis - Google Patents

Dispositif tamis Download PDF

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Publication number
EP4302883A1
EP4302883A1 EP22182722.3A EP22182722A EP4302883A1 EP 4302883 A1 EP4302883 A1 EP 4302883A1 EP 22182722 A EP22182722 A EP 22182722A EP 4302883 A1 EP4302883 A1 EP 4302883A1
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EP
European Patent Office
Prior art keywords
sieve
screening
conveying direction
longitudinal conveying
screen
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Withdrawn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
EP22182722.3A
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German (de)
English (en)
Inventor
Franz Anibas
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.)
Binder and Co AG
Original Assignee
Binder and Co AG
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 Binder and Co AG filed Critical Binder and Co AG
Priority to EP22182722.3A priority Critical patent/EP4302883A1/fr
Publication of EP4302883A1 publication Critical patent/EP4302883A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • B07B1/284—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens with unbalanced weights
    • 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
    • B07B1/4645—Screening surfaces built up of modular elements

Definitions

  • the invention relates to a screening device according to the preamble of claim 1. Furthermore, within the scope of the invention, a system comprising a screening device according to the invention and at least one downstream sorting device is specified.
  • Sieving machines are already known from the prior art, in which, in the operating state, a movably mounted, for example a spring-mounted, sieve box and an additional oscillating frame are set into vibration by means of an unbalance drive, with flexible sieve mats attached to cross beams being alternately stretched and compressed in order to ensure that they are free of blockages to ensure screening.
  • a movably mounted for example a spring-mounted, sieve box and an additional oscillating frame
  • flexible sieve mats attached to cross beams being alternately stretched and compressed in order to ensure that they are free of blockages to ensure screening.
  • one or more separating cuts can be achieved when sieving the particle mixture or grain mixture with this type of sieving machine, although the separating cuts are predetermined by the corresponding sieve hole widths or mesh sizes in the respective installed sieve coverings.
  • separation cut is understood by a person skilled in the field of screening technology to mean the particle size or grain size of the screening material or feed material in which the proportions of oversize in the fine material and undersize in the coarse material are approximately the same size.
  • the screen hole widths or mesh sizes of a screening machine should be selected slightly larger than the desired nominal separation cut.
  • the term “oversize” in fines refers to that portion of the screening material whose grain size is larger than the nominal separation cut.
  • undersize is defined as that portion of the screening material whose grain size is smaller than the nominal separation cut.
  • the coarse material separated off during operation forms a substantially continuously accumulating coarse grain stream
  • the separated fine material forms a substantially continuously accumulating fine grain stream.
  • Such known screening machines can preferably be used for fractionating product streams for sorting machines, in particular for optical sorting machines, the separating cut position being selected such that, for example, two sorting machines downstream of a screening machine are each fed with different size fractions of the screening material in such a way that the best possible sorting result is achieved can be.
  • a first grain size fraction with particle sizes of the material to be screened for example of 5-15 mm
  • a second grain size fraction with particle sizes of the material to be screened for example, of 15-40 mm, which sieved by the screening machine, can be fed to a specially adapted, second downstream sorting machine.
  • the separation performance or efficiency of a screening machine can be influenced, among other things, by the appropriate choice of the following parameters: Screen hole width or Mesh size of the sieve used, sieve covering, sieving duration, sieve inclination, sieve length and type of vibrations.
  • the grain sizes in the screenings vary greatly during operation, for example when processing waste glass, in particular in a range of higher fine grain content or higher proportion of fine material and / or in a range of higher coarse grain content or higher proportion of coarse material.
  • Such deviations in the grain size distribution of the material to be screened subsequently lead to a shift in quantity on the downstream optical sorting machines, which can result, for example, in an undesirable overload of the fine material strand of a sorting machine with a correspondingly worsened sorting result.
  • the coarse material strand of the sorting machine is hardly loaded with coarse grain and is therefore not used optimally.
  • a further object of the invention is to provide a screening device with which at least one separating cut for a fine grain stream and a Coarse grain flow can be variably adapted to changing screening goods or screening material compositions during ongoing operation of the screening device.
  • a system which comprises a screening device and at least one sorting device downstream of the screening device, with the system providing the best possible loading of the downstream sorting device even when the material to be screened changes and thus the highest possible system performance, system flexibility and system availability system should be guaranteed.
  • a sieve device comprises a sieve box which can be set into vibration with a drive and has at least one sieve surface, as well as a sieve feed device for feeding sieve material at a feed location onto the at least one sieve surface, the at least one sieve surface having a sieve length when viewed in an intended longitudinal conveying direction of the sieve material, whereby the feed location in the longitudinal conveying direction can be variably adjusted in relation to the at least one sieve surface.
  • the feed location of the material to be screened can be adjusted in the longitudinal conveying direction relative to at least one screen surface during operation of the screening device according to the invention without interruptions in operation in order to be able to adapt the achievable separation performance or the efficiency of the screening machine as flexibly as possible to the respective separation task.
  • the respective feed location in the longitudinal conveying direction By variable adjustment of the respective feed location in the longitudinal conveying direction, the available screen area or screen length and, as a result, the screening time or the residence time of the screening material for the respective screening task can be reduced or increased.
  • the screening material feeding device can in principle be arranged either rigidly or stationary in relation to at least one sieve surface, with corresponding closable discharge openings such as flaps, slides, and the like being able to be arranged in the screening material feeding device, for example, in such a way that by appropriately opening or adjusting the screen for the respective Separating task suitable discharge openings of the screening material feed device, the feed location of the screening material suitable for the individual screening task can be variably adjusted in the longitudinal conveying direction in relation to the screening surface under consideration.
  • the screening material feeding device can be arranged to be relatively movable in the longitudinal conveying direction in relation to the at least one screening surface.
  • the screening material feeding device can be designed to be movably displaceable or movable in relation to the screening device in the longitudinal conveying direction in order to be able to variably adjust the respective desired feeding location of the screening material feeding device in the longitudinal conveying direction in relation to the at least one screening surface.
  • the at least one screen surface can be preceded by a fine screen surface for fine screening of the material to be screened.
  • the screening surface in a screening device, can extend in the longitudinal conveying direction from a feed side facing the screening material feeding device to a discharge side opposite the feed side, the feed location being variably adjustable in the longitudinal conveying direction between the feed side and the discharge side of the at least one sieve surface.
  • the feed location of the screening material feeding device for feeding screening material onto the at least one sieve surface is selected so that the screening material feed is between the feed side and the delivery side of the at least one sieve surface and thus directly onto the corresponding sieve surface the screening device takes place.
  • the effective screening surface can also be adjusted variably.
  • effective sieve surface is understood to mean the area portion of the at least one sieve surface that is available for screening material separation.
  • a position of the screening device in the longitudinal conveying direction can be adjusted in relation to the at least one screening surface.
  • the screening device is arranged to be relatively movable in relation to the screening surface in order to be able to adapt the achievable separation performance and the efficiency of the screening device to different separation tasks as flexibly as possible.
  • the screening device feeding device can comprise a conveyor device which is adjustable in the longitudinal conveying direction, with a variable position of a free end of the conveying device determining the respective feeding location for feeding the screening material onto the at least one screening surface.
  • the conveying device of the screening material feeding device can, for example, be arranged either rigidly or stationary in relation to the screening material feeding device, provided that the screening material feeding device is arranged to be relatively movable in relation to at least one screening surface of the screening device.
  • the conveyor device can be arranged to be relatively movable in relation to the screening material feeding device, regardless of whether the screening material feeding device itself is arranged to be stationary or relatively movable in relation to the at least one screening surface of the screening device.
  • the invention also includes, for example, those embodiments of a screening device in which, for example, for the rough adjustment of the respective desired feed location, the screening material feed device as a whole can be adjusted in a first section in the longitudinal conveying direction relative to the sieve surface, and the fine adjustment of the feed location with regard to the longitudinal conveying direction is then carried out Corresponding adjustment of the individually suitable position of the conveyor device, for example a conveyor belt, a conveyor trough, a swivel chute, or the like, takes place relative to the screening device.
  • Combinations that can be moved telescopically relative to one another and have a screening device that can be variably adjusted in the longitudinal conveying direction relative to the at least one sieve surface, which in turn comprises a conveyor that can be variably adjusted in the longitudinal conveying direction relative to the screening device, are also conceivable within the scope of the invention.
  • a particularly flexible screening device can be obtained if the conveyor device is or comprises a conveyor belt.
  • the conveyor belt can expediently be adjusted in the longitudinal conveying direction relative to the at least one screen surface.
  • the respective variably adjustable position of the front free end of the conveyor belt advantageously determines the respective feed location for feeding the material to be screened onto the at least one screen surface.
  • the feed material can be transferred from the front free end of the conveyor belt approximately in the form of a throwing parabola to the underlying screening surface of the screening device.
  • the selected position of the front free end of the conveyor belt can deviate from the respective feed location of the material to be screened on the sieve surface when viewed in the longitudinal conveying direction, with the deviation between the position of the front free end of the conveyor belt and the feed location on the sieve surface viewed in the longitudinal conveying direction being approximately the extent of a Throwing parabola corresponds to the horizontal throwing of the material to be screened.
  • chutes below the corresponding conveyor device or below the conveyor belt.
  • Such chutes can be designed, for example, as chutes, downpipes or funnels and are used for the directed transport of the material to be screened from the free end of the conveyor device or the conveyor belt to the selected or specific feed location on the at least one screen surface.
  • conveyor belts can also be used as conveying devices in a screening device.
  • the control and regulation of the displacement or adjustment of the position of the respective front free conveyor belt end can be carried out with automation support from a control device for one conveyor belt or, if necessary, for several conveyor belts.
  • the conveying device of the screening device can be a conveyor trough or comprise a conveyor trough. It can be particularly useful if the conveyor device is or includes a conveyor trough which is adjustable in length in the longitudinal conveying direction relative to the at least one sieve surface. For example, variants of a conveyor trough with foldable, length-adjustable, extendable, telescopically extendable and/or attachable ones can be used Conveyor trough sections may be included in this embodiment of the invention.
  • Such conveyor troughs have the advantage of being able to be manufactured in a particularly robust design and inexpensively, which is why the ongoing operating and maintenance costs for a screening device that is equipped with a conveyor device in the form of one or more conveyor troughs can be comparatively low.
  • the conveyor trough in a screening device can have at least one pivotable bottom flap, preferably several pivotable bottom flaps arranged one behind the other in the longitudinal conveying direction.
  • the feed location of the material to be screened can be variably adjusted onto the screen surface in the longitudinal conveying direction.
  • the one bottom flap or the several bottom flaps of the conveyor trough is or are equipped, for example, with corresponding electric or pneumatic actuators.
  • the control and regulation of the respective variable position of the one or more floor flaps can be carried out with automation support from a control device which is coupled to or controls the corresponding actuating drives.
  • the conveying device in a screening device, can be a swivel chute which is adjustable in length in the longitudinal conveying direction relative to the at least one screen surface or can comprise such a swivel chute.
  • a swivel chute offers the advantage that by appropriately swiveling the swivel chute, the respective feed location of the material to be screened can be adjusted particularly effectively and quickly in the longitudinal conveying direction relative to the screen surface.
  • an angle of inclination of the swivel chute can be adjusted variably and thus the conveying speed of the material to be screened as it exits the front free end of the swivel chute can be influenced.
  • the height of the free end of the Swivel chute can be varied in relation to the underlying height level of the at least one sieve surface.
  • Such a swivel chute can either form the conveyor device or be part of such a conveyor device, whereby the swivel chute can be arranged downstream of a conveyor trough or a conveyor belt, for example, viewed in the conveying direction of the material to be screened.
  • the swivel chute is equipped, for example, with appropriate electric or pneumatic rotary drives.
  • the control and regulation of the respective variable position of the swivel chute can be carried out with automation support from a control device.
  • the at least one sieve surface has, at least in sections, a certain sieve hole width.
  • a sieve device can be used particularly flexibly, in which the at least one sieve surface has at least a first sieve surface section with a first sieve hole width and a second sieve surface section with a second sieve hole width that is different from the first sieve hole width.
  • the separation performance or the efficiency of the screening device can be increased, particularly when the screen is ready or .free-flowing material to be screened.
  • screen hole width and “mesh size” are used interchangeably below.
  • the separation performance of the sieve device can be adjusted as flexibly as possible to changing sieve goods or sieve material compositions or to changed tasks during ongoing operation of the sieve device be adapted without the need for operational interruptions and corresponding conversion work such as replacing screen coverings.
  • the at least one sieve surface in a sieve device can be formed by a plurality of sieve surface sections, each sieve surface section having a specific sieve hole width, the sieve hole widths of the different sieve surface sections each differing from one another.
  • multiplicity of screen surface sections here means three or more than three screen surface sections, each of the screen surface sections having a specific screen hole width, which is not realized again on this at least one screen surface.
  • a classifying separation task can advantageously be carried out with such a provided sieve surface.
  • a corresponding grain size fraction of the screening material can be sieved according to the respective sieve hole width of the selected sieve surface section.
  • a next grain size fraction or grain class of the material to be screened can be screened, the particle sizes of this next grain size fraction corresponding to the respective sieve hole width of this next screen surface section. It is expedient to proceed in such a way that the sequence of the sieve surface sections used for the classifying screen separation task is selected in such a way that the corresponding screen hole widths of the screen surface sections decrease as the screen separation task progresses.
  • the screen hole widths of the screen surface sections of the at least one screen surface decrease from the feed side to the discharge side of the at least one screen surface, viewed in the longitudinal conveying direction of the material to be screened.
  • Such a screening surface on the task side has larger sieve hole widths than on the delivery side, offers the advantage that the separation cut can be significantly reduced by variable adjustment or displacement of the feed location towards the delivery side, whereby the amount of fine material can be reduced and an overload of any downstream fine grain sorting device can be prevented can.
  • the available screen surface can be shortened and the separation cut for the screen underflow can thus be reduced.
  • the full available screen surface can be used for the respective screen separation task, whereby due to the larger screen hole widths on the feed side, the separation cut for the lower screen flow is increased accordingly and thus the amount of material in the lower screen flow increases .
  • the at least one sieve surface is formed at least in sections by a sieve covering.
  • the at least one sieve surface can be formed by a sieve covering, the sieve covering having at least a first sieve covering section with a first sieve hole width, and a second sieve covering section adjacent to the first sieve covering section with a width different from the first sieve hole width , second sieve hole width.
  • the screen covering sections can be made from the same covering material or from different covering materials.
  • the at least one sieve surface can be provided if this sieve surface is formed by at least two or more sieve coverings, each sieve covering having a specific sieve hole width, the sieve hole widths of the different sieve coverings each differing from one another .
  • the at least two or more screen coverings are each arranged as transverse strips between cross members of the at least one screen surface. Such an arrangement offers the advantage that the individual strip-shaped screen coverings can each be attached to the cross members and, if necessary, can be easily replaced or renewed individually or together.
  • the forces acting on the screen coverings during operation can be diverted to the cross members, which is why the screening device can be operated as maintenance-free as possible with the longest possible service life of the screen coverings used.
  • each transverse strip of the screen coverings is arranged transversely to the longitudinal conveying direction and thus each transverse strip of a screen covering corresponds to a longitudinal section of the screen length.
  • the at least one screening surface in a screening device can be formed at least in sections by a first, rigidly installed screening covering.
  • the at least one screening surface can be formed at least in sections by a first screening covering in the form of a movably mounted screening mat, with preferably a vibration of the movably mounted screening mat being adjustable.
  • the at least one sieve surface with a feed location that can be variably adjusted in the longitudinal conveying direction for feeding screening material onto the at least one sieve surface is followed by a further, second sieve surface in the longitudinal conveying direction, the further, second sieve surface in turn has a screening material feeding device, in which a feeding location for feeding screening material onto the second screening surface can be variably adjusted in the longitudinal conveying direction relative to the second screening surface.
  • such a screening device viewed in the longitudinal conveying direction, can first have a fine sieve surface for the fine grain separation of the sieved material, with a first sieve surface for a medium-grain separation of the sieved material viewed in the longitudinal conveying direction and, downstream or finally, a second sieve surface for the coarse grain separation of the sieved material being provided in the longitudinal conveying direction.
  • blow-out pulses from the sorting device can serve as control signals that are output by the at least one downstream sorting device for controlling the screening device.
  • the control can be carried out pneumatically, for example, by the number of blow-out pulses from the downstream sorting devices.
  • the control device can trigger the blow-out pulses of the fine grain sorting device when a presettable number of pulses is exceeded
  • the feed point in the screening device can be gradually moved towards the delivery side of the screening surface. In this case, the separation cut can be reduced, the amount of fine material leaving the screening device can be reduced, and overloading of the downstream fine grain sorting device can thus be prevented.
  • the overloading of a downstream sorting device for coarse grain a so-called coarse grain sorting device
  • the overloading of a downstream sorting device for coarse grain can be prevented by moving the feed point in the sieve device gradually towards the feed side when a presettable number of blow-out pulses from the coarse grain sorting device is exceeded is shifted towards the sieve surface.
  • the separation cut can be enlarged, the amount of fine material can be increased or the amount of coarse material can be reduced, thus preventing overloading of the coarse grain sorting device.
  • the at least one sorting device is an optical sorting device and the system is preferably set up to sort waste glass into at least two different color fractions.
  • the use of such a system can ensure the best possible sorting result as well as a large throughput both when sorting "coarse grain” and when sorting "fine grain”.
  • the sorting of “coarse grain”, i.e. the coarse grain fraction can be carried out, for example, in a separate, first sorting device, which is arranged downstream of the outgoing coarse grain stream of the screening device.
  • the sorting of “fine grain”, i.e. the fine grain fraction can be carried out, for example, in a separate, second sorting device, which is arranged downstream of the outgoing fine grain stream of the screening device.
  • the two or more downstream sorting devices are optical sorting devices in order to be able to sort different color fractions of the glass particles.
  • Optical sorting devices enable automated processes for sorting solid products, for example with the help of cameras and/or lasers.
  • optical sorting devices can detect the color, size, shape, structural properties and/or chemical compositions of objects.
  • objects to be sorted are compared with user-defined acceptance/rejection criteria to identify and remove deviating, defective objects from a production line or to separate objects of different qualities or material types.
  • Fig. 1 shows a first embodiment of a screening device 1 according to the invention in a sectional view from the side.
  • the screening device 1 includes a housing 2, which is also referred to as a screening box 2.
  • the screening device 1 comprises a drive 3, for example an unbalance drive 3, which is set up to cause the housing 2 or the screening box 2 to vibrate during operation of the screening device 1.
  • the housing 2 or the sieve box 2 is mounted in a swinging, movable manner with several oscillating bearings 4, which are designed here, for example, as spring bearings 4.
  • the sieve box 2 has on its underside a conveyor base 5 for fine material, which here is inclined at an angle of inclination ⁇ in relation to the horizontal in the operating position of the sieve device 1.
  • the conveyor base 5 is even more precise, as in Fig. 1 shown, seen here in a longitudinal conveying direction R of a screening material S, which screening material S is fed into the screening device 1, inclined downwards in the longitudinal conveying direction R at the angle of inclination ⁇ in relation to the horizontal.
  • the arrow R symbolizes the longitudinal conveying direction R of the fed screening material S, which is symbolized by an arrow S.
  • a feed opening 6 on the top of the sieve box 2 serves for the screening material supply of the sieve material S.
  • An outlet opening 7 on the underside of the sieve box 2, for example in the conveyor base 5, serves for the discharge of a fine grain fraction F or a fine grain stream F, which is symbolized by an arrow F .
  • Another opening on the underside of the sieve box 2 serves as an outlet opening 8 for the discharge of a coarse grain fraction G or a coarse grain stream G, as in Fig. 1 is symbolized by an arrow G.
  • the direction or orientation of the symbolic arrows S, F, G is intended to indicate the flow direction of the corresponding media, namely the feed direction of the screening material S or the discharge directions of the fine material stream F or the coarse material stream G, during ongoing operation of the screening device 1.
  • the fine grain fraction F or the fine grain stream F can then be stored in a downstream sorting device, not shown here for fine grain sorting, a so-called fine grain sorting device.
  • the coarse grain fraction G or the coarse grain stream G can then be sorted in a downstream sorting device for coarse grain sorting, not shown here, a so-called coarse grain sorting device.
  • the downstream sorting devices can be optical sorting devices in order to sort the fine grain fraction F or the coarse grain fraction G according to optically detectable criteria such as color, size, shape, structural properties and/or their chemical composition.
  • a double arrow 9 is intended to illustrate a direction of vibration 9 of the sieve box 2 during ongoing operation of the sieve device 1.
  • a sieve surface 10 which extends in sections from right to left Fig. 1 considers a first screen lining 11, a second screen lining 12, a third screen lining 13, a fourth screen lining 14, a fifth screen lining 15 and a sixth screen lining 16.
  • a screen length 17 of the screen surface 10 viewed in the longitudinal conveying direction R is therefore formed by strips of the screen coverings 11 to 16.
  • the sieve surface 10 and the strips of the sieve coverings 11 to 16 each have a constant width.
  • the sieve surface 10 here is essentially rectangular in shape and, viewed in the longitudinal conveying direction R of the material to be screened S, is inclined downwards at the angle of inclination ⁇ in relation to the horizontal.
  • the sieve surface 10 extends with its sieve length 17 in the longitudinal conveying direction R from a feed side 18 to a delivery side 19 opposite the feed side 18.
  • the screen surface 10 is supported here by several cross members 20, with the several screen coverings 11 to 16 each being arranged as transverse strips between the adjacent cross members 20.
  • Each of the several screen coverings 11 to 16 each has a specific screen hole width.
  • the first screen covering 11 has a first screen hole width 21, the second screen covering 12 has a second screen hole width 22, the third sieve covering 13 has a third sieve hole width 23, the fourth sieve covering 14 has a fourth sieve hole width 24, the fifth sieve covering 15 has a fifth sieve hole width 25 and the sixth sieve covering 16 has a sixth sieve hole width 26.
  • the sieve hole widths 21 to 26 each differ from one another and are arranged in such a way that, viewed in the longitudinal conveying direction R of the material to be screened S, the sieve hole widths 21 to 26 of the sieve surface sections of the sieve surface 10 decrease from the feed side 18 to the discharge side 19 of the sieve surface 10. Accordingly, the first screen hole width 21 of the first screen covering 11, which is arranged on the feed side 18 of the screen surface 10, is the largest screen hole width or mesh size of this screen surface 10. Conversely, here is the sixth screen hole width 26 of the sixth screen covering 16, which is on the delivery side 19 the sieve surface 10 is arranged, the smallest sieve hole width of the sieve surface 10 shown here.
  • Fig. 1 is marked with a dash-dotted line a screening material feeding device 30 for feeding screening material S to a feeding location on the screening surface 10, the screening material feeding device 30 comprising a conveyor device 31, which is designed here as a conveyor trough 32 with several bottom flaps 33.
  • the conveyor trough 32 here specifically has, for example, three bottom flaps 33 arranged one behind the other in the longitudinal conveying direction R, each of which is pivotally mounted 34.
  • the variable length section L of the conveyor trough 32 provided with the three bottom flaps 33 is marked with an arrow length L.
  • a corresponding pivoting or folding direction 34 for opening or closing the bottom flaps 33 is indicated here by a double arrow 34.
  • the three bottom flaps 33 shown here arranged one behind the other in the conveyor trough 32 enable four different positions P1, P2, P3 and P4 of the respective free front end of the conveyor trough 32. These position positions P1, P2, P3 and P4 each correspond to variable lengths L1, L2 , L3 or L4 of the screenings feed device 30 or the conveyor device 31.
  • the first position P1 - corresponding to the first variable length L1 of the conveyor device 31 - is defined by a first transverse edge as seen in the longitudinal conveying direction R first floor flap 33 corresponding floor opening in the conveyor trough 32.
  • the fourth position P4 - corresponding to the fourth variable length L4 of the conveyor 31 - is defined by the front free end of the conveyor trough 32 as seen in the longitudinal conveying direction R.
  • the second and third bottom flaps 33 seen in the longitudinal conveying direction R also function accordingly.
  • a position P1, P2, P3, P4 of the respective free front end of the conveyor trough 32 can be variably adjusted in the form of the respectively opened bottom flap 33.
  • the selected variable position P1, P2, P3, P4 of the free front end of the conveying direction 31, which is determined here in the conveying trough 32 by the position of the respectively opened bottom flap 33, also determines a variable feed location A1, A2, A3, A4 for the feed of the material to be screened S onto the screening surface 10 underneath.
  • Fig. 1 are the respective delivery locations, namely a first delivery location A1, which is assigned to the first position P1, a second delivery location A2, which is assigned to the second location position P2, a third delivery location A3, which is assigned to the third location position P3, and a fourth delivery location A4 , which is assigned to the fourth position P4, each indicated by a dashed arrow A1, A2, A3 and A4.
  • the course of these arrows A1 to A4 is intended to symbolize the transfer of the feed material or screening material S from the respective front free end P1, P2, P3, P4 of the conveyor trough 32, approximately in the form of a throwing parabola, to the underlying screening surface 10 of the screening device 1.
  • chutes below the bottom openings of the conveyor trough 32.
  • Such chutes that in Fig. 1 are not explicitly shown, can be designed, for example, as chutes, downpipes or funnels and are used for the directed transport of the screenings S to the selected or specific delivery location A1 to A4.
  • the second bottom flap 33 has just been opened at the second position P2, which is why the current delivery location for the screening material feed S onto the underlying sieve surface 10 is the second delivery location A2.
  • Fig. 2 shows a second embodiment of a screening device 1 according to the invention in a sectional view from the side.
  • the Fig. 2 illustrated second embodiment differs from that in the Fig. 1 shown first embodiment essentially in that the first screen surface 10 in the longitudinal conveying direction R of the material to be screened S is preceded by an additional fine screen surface 40 with a screen covering 41 for fine screening.
  • the housing 2 or the sieve box 2 has a further outlet opening 42 for discharging a first fine grain fraction F1.
  • the fine screen surface 40 is supported here by several cross members 20, with the screen covering 41 being arranged between adjacent cross members 20.
  • the outlet opening 7 serves here to discharge a second fine grain fraction F2.
  • Fig. 3 shows a third embodiment of a screening device 1 according to the invention in a sectional view from the side.
  • the screening device 30 here comprises a conveyor 31 in the form of a conveyor belt 35.
  • the conveyor belt 35 is here adjustable or movable in the longitudinal conveying direction R, the variable length section L of the conveyor belt 35 being marked with an arrow L.
  • the material to be screened is seen in the longitudinal conveying direction R before the start of the screen surface 10 in the area placed into the sieve box 2 on the feed side 18.
  • the delivery location A1 of the screening material is here Fig. 3 For example, seen in the longitudinal conveying direction R, just in front of the feed-side 18 start of the sieve surface 10. In this case, if the feed location A1 is selected for the feed of the screening material S, the entire sieve length 17 or the entire sieve surface 10 is available for the sieve separation task.
  • the material to be screened S is viewed in the longitudinal conveying direction R approximately in the middle of the sieve surface 10, i.e. approximately in the middle between the feed side 18 and the Delivery side 19 of the sieve surface 10, placed on this.
  • the delivery location A2 of the screening material is here Fig. 3
  • Fig. 3 For example, seen in the longitudinal conveying direction R, approximately in the area of the third screen covering 13. In this case, only that screen length or screen area is available for the screen separation task that is from the third screen covering 13, the fourth screen covering 14, the fifth screen covering 15 and the sixth screen covering 16 is formed.
  • Fig. 1 referred to, with comparable parts and components each being provided with the same reference numerals.
  • Fig. 4 shows a fourth embodiment of a screening device 1 according to the invention in a sectional view from the side.
  • the screening device 30 here comprises a conveyor 31 in the form of a swivel chute 36.
  • the material to be screened is already fed into the screen box 2 before the start of the screen surface 10 in the area of the feed side 18.
  • the delivery location A1 of the screening material is here Fig. 4
  • the entire sieve length 17 or the entire sieve surface 10 is therefore available for the sieve separation task.
  • the material to be screened is viewed in the longitudinal conveying direction R approximately in the middle of the sieve surface 10, i.e. approximately in the middle between the feed side 18 and the discharge side 19 of the sieve surface 10 , given up on this.
  • the delivery location A2 of the screening material is here Fig. 4
  • Fig. 4 For example, seen in the longitudinal conveying direction R, approximately in the area of the third screen covering 13. In this case, only that screen length or screen area is available for the screen separation task that is from the third screen covering 13, the fourth screen covering 14, the fifth screen covering 15 and the sixth screen covering 16 is formed.
  • Fig. 1 refers the previous description of the Fig. 1 referred.
  • Fig. 5 shows an oblique view of an arrangement of a system 50 according to the invention, comprising a screening device 1 and two sorting devices 60, 70, each of the screening device 1 are subordinate.
  • the two sorting devices 60, 70 are each sketched with dashed contour lines as a wire grid model.
  • the screening device 1 here, for example, is identical in construction to the one previously shown Fig. 2 illustrated second embodiment.
  • the first sorting device 60 is used here for fine grain sorting and is arranged downstream of the second fine grain stream F2 from the screening device 1.
  • the second fine grain stream F2 passes from the screening device 1 via a first feed trough 61 into the first sorting device 60.
  • the second sorting device 70 is used for coarse grain sorting and is downstream of the coarse grain stream G from the screening device 1.
  • the coarse grain stream G passes from the screening device 1 via a second feed trough 71 into the second sorting device 70.
  • the system 50 shown here is suitable, for example, for sorting waste glass.
  • the two sorting devices 60, 70 are each optical sorting devices that are designed to sort waste glass into at least two different color fractions.
  • the system 50 further comprises a central control device 80, the control device 80 being coupled in terms of signals to the screening device 1 and to the two sorting devices 60, 70.
  • the control device 80 is set up to variably adjust the respective feed location A1 to A4 of the screening device 30 to the screening surface 10 in the longitudinal conveying direction R on the basis of control signals 81 from the sorting devices 60, 70 during ongoing operation of the screening device 1.
  • the control signals 81 can be, for example, wireless radio signals.
  • pneumatic control signals 81 in the form of blow-out pulses from the sorting devices 60, 70 are used for control in order to be able to variably adjust the feed location A1 to A4 of the material to be screened S in the longitudinal conveying direction R with respect to the screen surface 10.
  • the control signal paths 81 are in Fig. 5 indicated as dash-dotted lines.
  • the control of the system 50 can be carried out, for example the number of blow-out pulses from the downstream sorting devices 60, 70 takes place.
  • actuators 85 of the screening device 1 with one actuator 85 being assigned to a bottom flap 33 in the conveyor trough 32 of the conveyor 31, can be controlled, for example by means of pneumatic control signals 81, in such a way that the bottom flap corresponding to the current screen separation task 33 is opened variably and the appropriate delivery location A1 to A4 is set variably.
  • blow-out pulses 81 of the fine grain sorting device can be used 60 from the control device 80 the feed point A1 in the screening device 1 can be gradually moved from the feed side 18 towards the discharge side 19 of the sieve surface 10.
  • the separation cut can be reduced, the amount of fine material F or fine material fractions F1 and/or F2 that leaves the screening device 1 can be reduced, and thus an overload of the downstream fine grain sorting device 60 can be prevented.
  • the overloading of a downstream sorting device 70 for coarse grain can be prevented by moving the feed point A1 in the screening device 1 stepwise towards the feed side when a presettable number of blow-out pulses 81 of the coarse grain sorting device 70 is exceeded 18 is moved towards the sieve surface 10.
  • the separation cut can be increased, the amount of fine material F or fine material fractions F1 and/or F2 can be increased or the amount of coarse material G can be reduced, thus preventing overloading of the downstream coarse grain sorting device 70.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
EP22182722.3A 2022-07-04 2022-07-04 Dispositif tamis Withdrawn EP4302883A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22182722.3A EP4302883A1 (fr) 2022-07-04 2022-07-04 Dispositif tamis

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22182722.3A EP4302883A1 (fr) 2022-07-04 2022-07-04 Dispositif tamis

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EP4302883A1 true EP4302883A1 (fr) 2024-01-10

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EP22182722.3A Withdrawn EP4302883A1 (fr) 2022-07-04 2022-07-04 Dispositif tamis

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EP (1) EP4302883A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157548B (de) * 1959-03-24 1963-11-14 Becker Pruente G M B H Anlage zum Wegfoerdern und Verteilen von Dung
AT378699B (de) * 1984-01-26 1985-09-10 Hartl Franz Siebvorrichtung
JPH04322751A (ja) * 1991-04-23 1992-11-12 Kubota Corp 粉砕機用可動シュート
DE202016103754U1 (de) * 2016-07-13 2016-08-16 Binder + Co Ag Siebmaschine
US20170341865A1 (en) * 2016-05-31 2017-11-30 Baker Hughes Incorporated Conveyor system, operating system using conveyor system, and method
CN207258584U (zh) * 2017-10-11 2018-04-20 贵州省湄潭县鑫辉茶业有限公司 茶叶运输机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1157548B (de) * 1959-03-24 1963-11-14 Becker Pruente G M B H Anlage zum Wegfoerdern und Verteilen von Dung
AT378699B (de) * 1984-01-26 1985-09-10 Hartl Franz Siebvorrichtung
JPH04322751A (ja) * 1991-04-23 1992-11-12 Kubota Corp 粉砕機用可動シュート
US20170341865A1 (en) * 2016-05-31 2017-11-30 Baker Hughes Incorporated Conveyor system, operating system using conveyor system, and method
DE202016103754U1 (de) * 2016-07-13 2016-08-16 Binder + Co Ag Siebmaschine
CN207258584U (zh) * 2017-10-11 2018-04-20 贵州省湄潭县鑫辉茶业有限公司 茶叶运输机

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