EP4349499A1 - Dispositif de tamisage pour cribler un produit à tamiser et étoile de criblage pour dispositif de tamisage - Google Patents

Dispositif de tamisage pour cribler un produit à tamiser et étoile de criblage pour dispositif de tamisage Download PDF

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Publication number
EP4349499A1
EP4349499A1 EP23201651.9A EP23201651A EP4349499A1 EP 4349499 A1 EP4349499 A1 EP 4349499A1 EP 23201651 A EP23201651 A EP 23201651A EP 4349499 A1 EP4349499 A1 EP 4349499A1
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EP
European Patent Office
Prior art keywords
star
sieve
rotation
coupling
axis
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.)
Pending
Application number
EP23201651.9A
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German (de)
English (en)
Inventor
Bernhard GÜNTHER
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.)
Guenther Holding GmbH and Co KG
Original Assignee
Guenther Holding 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 Guenther Holding GmbH and Co KG filed Critical Guenther Holding GmbH and Co KG
Publication of EP4349499A1 publication Critical patent/EP4349499A1/fr
Pending 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
    • B07B1/12—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
    • 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 for screening material.
  • the screening device is a so-called star screen with rotating screening stars that mesh together like a comb.
  • the screening material can be bulk materials, in particular mixtures containing soil, such as crops covered in soil and/or stone material covered in soil, compost, wood chips or, for example, building rubble or household waste or other municipal waste.
  • the invention also relates to a screening star for such a screening device.
  • Screening stars and screening devices so-called star screens, as the invention relates, among other things, are known from EP 1 088 599 B1 and the EP 3 628 411 A1
  • These screening devices and screening stars have proven their worth.
  • problems can arise from long-fiber, thread-like, rope-like, net-like or other winding components contained in the screening material.
  • Such screening material can wind around the base of the gaps between neighboring screening stars and hinder the comb-like engagement of the screening stars, so that more energy is required to rotate the screening stars or the screening stars can be damaged.
  • the invention accordingly relates to a screening device with screening stars for screening a screening material, for example municipal waste, screening material containing soil or wood chippings.
  • the screening device comprises a first screening star, a second screening star and a third screening star.
  • the first screening star is arranged so as to be rotatable about a first axis of rotation of the screening device and has a plurality of fingers distributed around the first axis of rotation, which protrude from a foot region of the first screening star to a free peripheral end away from the first axis of rotation.
  • the second screening star is adjacent to the first screening star along the first axis of rotation and is arranged so as to be immobile relative to the first screening star, i.e. can also be rotated around the first axis of rotation.
  • the second screening star has a plurality of fingers distributed around the first axis of rotation, which protrude from a foot region of the second screening star to a free peripheral end. protrude away from the first axis of rotation.
  • the third sieve star is arranged so as to be rotatable about a second axis of rotation extending radially next to the first axis of rotation and has a number of fingers distributed around the second axis of rotation, which protrude from a base region of the third sieve star to a free peripheral end away from the second axis of rotation.
  • the arrangement of the sieve stars is also such that the fingers of the third sieve star, when rotated about the second axis of rotation, protrude one after the other into a gap remaining between the base region of the first sieve star and the base region of the second sieve star, up to almost the bottom of the gap.
  • the arrangement of the three sieve stars is exemplary for further such arrangements within the sieve device, which can have further sieve stars next to each other along each of the two axes of rotation and can be rotated together about the respective axis of rotation.
  • the sieve device has three or more arrangements of sieve stars, each of which can be rotated together along a common axis of rotation and about the respective axis of rotation, with the three or more axes of rotation extending at least substantially parallel to each other.
  • the sieve device can form a flat sieve deck that is inclined horizontally or at an angle to the horizontal, or a sieve trough or sieve ramp.
  • the sieve stars of adjacent axes of rotation can mesh with each other in a comb-like manner as described above.
  • each further arrangement(s) of three sieve stars two of which are arranged next to each other along a common axis of rotation and another sieve star engages in the gap remaining between them, also correspond to the claimed and/or described and/or illustrated arrangement of three sieve stars.
  • the fingers of the sieve stars are expediently elastically flexible.
  • the fingers or the sieve stars as a whole can consist in particular of an elastomer material or elastomer composite material or, for example, of rubber.
  • the fingers can protrude in a star shape straight away from the respective axis of rotation or can preferably be sickle-shaped, with the peripheral end expediently following the root area of the respective finger with respect to the direction of rotation.
  • the invention addresses the problem of winding and the associated accumulation of the windable screening material components by a special design of the gap base between adjacent screening stars along a common axis of rotation.
  • the gap base rises monotonically from the axial middle section in the axial direction to both sides over an axial length L everywhere with a radius of curvature K in order to counteract the accumulation of windable material on the sides of the gap base.
  • the gap base rises in this way in a rounded curve at least in the left side section and in the right side section.
  • the length L can be K > 0.5 ⁇ L or K ⁇ 0.8 ⁇ L and or K ⁇ 5 ⁇ L or K ⁇ 3 ⁇ L or K ⁇ 2 ⁇ L apply.
  • K can advantageously correspond to the relation 0.5•D > K or 0.3•D > K.
  • the length L over which the gap base rises in a curved manner according to the relation D > K > 0.1•D, whereby K also satisfies one or more of the more narrowly dimensioned relations in advantageous further developments, is advantageously the same on both sides of the central section.
  • the contour of the gap base is the same on both sides of the central section.
  • the gap base is plane-symmetrical with respect to a plane orthogonal to the first axis of rotation.
  • the invention has also recognized that the lateral ends of the gap base become real collection points for windable screening material, not least because the screen star engaging in the gap, here the third screen star, does not reach the lateral ends of the gap base or windable screening material even presses there in an axial direction against the screen star that laterally borders the gap.
  • the axial middle section from which the gap base rises monotonically to the left and right, can be cylindrical, in particular circular-cylindrical.
  • the gap base can advantageously be designed in such a way that the respective side section in each longitudinal section continuously and differentiates into the straight middle section. If the radius of curvature is constant over the length L, for example, and the rise is circular, the curved contour of the respective side section continuously transitions into the straight contour of the middle section. If a tangent to the curved contour of the respective side section in the transition to the straight middle section is inclined to the middle section, the angle of inclination is so small that the windings cannot be pressed against each other sideways, as described above.
  • the gap base rises from the axial middle section in an axial direction to both sides with a curve
  • this also includes further developments in which the curve continues from the side sections into the middle section.
  • the gap base in the axial middle section is also gently rounded and preferably continues the curve of the respective side section continuously. It is advantageous if the contour of the gap base, i.e. the free outer circumferential surface forming the gap base, can be continuously differentiated in each longitudinal section over the axial length of the middle section and the two side sections, so that the gap base is curved round everywhere over the axial length of the middle section and the side sections.
  • the radius of curvature K can vary in the respective side section and/or in the middle section, if this is also curved in an arc.
  • the radius of curvature can decrease axially in the direction of the first sieve star and/or in the direction of the second sieve star, so that the gap base increases progressively in the direction of the first sieve star and/or in the direction of the second sieve star. It is advantageous if the contour of the gap base can be continuously differentiated in each longitudinal section, i.e. the varying radius of curvature can be described by a continuous function.
  • the radius of curvature K is constant, so that the base of the gap in the respective side section describes a circular arc section in each longitudinal section at least over the length L. If the arc-shaped course continues into the middle section, the base of the gap can describe a circular arc section in each longitudinal section.
  • the fingers of the first sieve star protrude from a finger base circle of the first sieve star.
  • the finger base circle connects the radially deepest points between the fingers.
  • the fingers of the second sieve star protrude from a finger base circle of the second sieve star, which connects the radially deepest points between the fingers of the second sieve star.
  • the gap base increases monotonically up to at least the finger base circle, preferably beyond the finger base circle of the first sieve star, and up to at least the finger base circle, preferably beyond the finger base circle of the second sieve star, with a radius of curvature K from the range D > K > 0.1•D or one of the narrower ranges disclosed above.
  • the curvature thus extends to or preferably into the foot area of the fingers of the respective sieve star and thus over an advantageously large length L. Windings are forced radially relatively far outwards and therefore with a correspondingly steep but continuous drop in the gap base away from the fingers of the respective sieve star in the direction of the center of the gap base.
  • the gap base runs out on the respective side with a radius of curvature K and an inclination of at least 40° or at least 50°, preferably at least 60°, to the first axis of rotation.
  • the gap base rises monotonically over an arc angle of at least 30° or at least 50° or at least 70° everywhere with a radius of curvature K that corresponds to the relations D > K > 0.1•D or one or more of the additionally disclosed relations. If the front surface of the respective sieve star adjoining the gap base is orthogonal to the first axis of rotation, the gap base can run into the front surface of the respective sieve star with a radius of curvature K according to the invention at an angle of 90° to the first axis of rotation.
  • the gap base can run into the front face of the respective sieve star with a radius of curvature K according to the invention at an advantageously equal angle of inclination of less than 90° in order to create a smooth transition.
  • the front face of the respective sieve star accordingly runs tangentially into the gap base.
  • the fingers of the sieve stars can have parallel front surfaces, whereby the front surfaces can point radially to the axis of rotation.
  • the fingers of the sieve stars taper from their foot areas towards the respective peripheral end, preferably monotonously and continuously.
  • the sieve stars can taper conically in particular.
  • the feature of tapering can be implemented in particular together with the feature of the continuous, tangential run-in of the gap base into the front surface of the respective sieve star or the respective finger.
  • the first and second sieve stars can form a built-in shaft with further sieve stars that are arranged next to one another along the first axis of rotation, to form which shaft the adjacent sieve stars are connected to one another in a rotationally fixed manner directly or indirectly via at least one intermediate piece around the first axis of rotation.
  • the sieve stars are preferably arranged on a rotatably mounted shaft that extends centrally through the sieve stars.
  • the shaft can have a non-circular outer circumference and the sieve stars can each have an adapted non-circular inner circumference, so that rotational movements of the shaft are transmitted to the sieve stars when the outer circumference and inner circumference engage.
  • the adjacent sieve stars can be connected to one another in a rotationally fixed manner directly or indirectly via at least one intermediate piece around the first axis of rotation, so that a torque can be transmitted both when the shaft engages with the respective sieve star and when the sieve stars engage directly with one another or when they engage with the intermediate pieces.
  • a shaft passes through the screen stars arranged along a common axis of rotation.
  • the shaft and the screen stars each have a non-circular outer and inner circumference adapted to transmit the torque. Since the screen stars are typically made of an elastomer material or rubber, the torque that can be transmitted is limited. The rotating operation leads to rapid wear in the area of the inner circumference of the screen stars. To improve torque transmission and reduce wear, metal bodies are also used that form the inner circumference of the respective screen star.
  • winding material causes a further problem by drawing itself into gaps between adjacent screen stars and thereby leading to axial tension or axial displacement of screen stars. Gaps are often present in the middle area of the gap between adjacent screen stars along a common axis of rotation. From the respective gap, windings of material can build up into the gap at the bottom of the gap. If contact even occurs with the peripheral ends of the fingers of an engaging screen star, the friction and/or tear-off forces must be compensated by increasing the drive energy for the rotary drive.
  • a further task is therefore to counteract the drawing in of winding screening materials in the middle area of the gap bottom.
  • the invention therefore also relates to a screening device for screening a feed material, such as municipal waste, wood chippings or soil-covered crops, which comprises a first screening star and a second screening star.
  • the first screening star is arranged so as to be rotatable about a first axis of rotation and has a plurality of fingers distributed around the first axis of rotation, each of which protrudes from a base region of the first screening star to a free peripheral end away from the first axis of rotation.
  • the second screening star is arranged adjacent to the first screening star so as to be rotatable about the same axis of rotation and has a plurality of fingers distributed around the axis of rotation, each of which protrudes from a base region of the second screening star to a free peripheral end away from the first axis of rotation.
  • An axial gap with a gap base remains between the fingers of the first screening star and the fingers of the second screening star.
  • the screening device comprises a positive-locking coupling which couples the first screening star and the second screening star in a rotationally immovable manner.
  • the two sieve stars can be coupled directly to each other or indirectly to each other by means of a coupling structure.
  • the screen stars abut one another with flat front surfaces that are normal to the common axis of rotation, so that a butt joint is obtained that runs around the first axis of rotation at the bottom of the gap in the form of a line that is straight and orthogonal to the axis of rotation when the bottom of the gap is developed.
  • Wrappable screening material has a tendency to be drawn into this flat butt joint when the screen stars are rotating.
  • the invention eliminates such a gap running around the middle area between the screen stars at the bottom of the gap, as it exists between the usually flat end faces of adjacent screen stars pointing normal to the axis of rotation.
  • the direct coupling can be formed by the first sieve star and the second sieve star axially overlapping each other on facing end faces in the area of the gap base, so that a joint is obtained at the gap base with joint sections that are axially offset from each other in a development of the gap base.
  • the axially abutting or closely spaced opposite end faces of the sieve stars can be inclined as a whole to the axis of rotation, so that the course of the butt joint is V-shaped or parabolic in a development of the gap base.
  • the end faces lie opposite each other in the circumferential direction or direction of rotation across the joint, so that one sieve star can exert a torque on the other via these end faces. A long straight course orthogonal to the axis of rotation in the development of the sieve base is avoided.
  • the adjacent screen stars engage with each other axially several times on their facing end faces around the first axis of rotation and, when engaged, form a gap that runs in a meandering manner around the axis of rotation at the base of the gap.
  • the gap can advantageously have a wave-like course at the base of the gap, for example sinusoidal or otherwise round or triangularly jagged.
  • a joint that runs like a rectangular wave at the base of the gap is preferred.
  • the meandering course of the joint in the circumferential direction prevents the pulling in of winding material to be screened particularly effectively and improves torque transmission.
  • the hub collar of the respective sieve star expediently a left hub collar and a right hub collar, can be formed with its coupling elements and recesses in the manner of a coupling half of a claw coupling.
  • the direct coupling of adjacent sieve stars can therefore act like a claw coupling when the sieve stars engage.
  • the engagement with a meandering joint at the bottom of the gap can be achieved in that the first sieve star and the second sieve star each have two or preferably more axially projecting coupling elements distributed around the axis of rotation on the facing end faces and an axial recess between coupling elements adjacent in the circumferential direction, and the coupling elements of each of the one sieve star protrude axially into the recesses of the other sieve star.
  • the indirect coupling can be formed in that the screening device comprises a separate coupling structure which covers the gap base over at least a predominant part its axial length and is in positive engagement with the first sieve star on one end face and with the second sieve star on the other end face.
  • the indirect coupling can comprise at least one coupling element that is rotationally immovable relative to the coupling structure and at least one coupling counter-element that is rotationally immovable relative to the respective sieve star on both end faces of the coupling structure, wherein the at least one coupling element and the at least one coupling counter-element engage with one another in the respective positive engagement.
  • the coupling comprises on both end faces of the coupling structure, distributed around the first axis of rotation, a plurality of coupling elements that are rotationally immovable relative to the coupling structure and a plurality of coupling counter-elements that are rotationally immovable relative to the respective sieve star, wherein the coupling elements and coupling counter-elements engage with one another on the respective end face in the respective positive engagement.
  • the respective coupling element can be formed on the coupling structure or formed separately and joined to the coupling structure in an undetachable manner.
  • the respective coupling element can instead also be provided separately and detachably connected to the coupling structure, for example plugged or screwed.
  • the respective coupling counter element can be formed on the respective sieve star or permanently joined to the respective sieve star or, instead, can be provided separately and detachably connected to the respective sieve star, for example plugged or screwed.
  • the coupling elements and coupling counter-elements of the indirect coupling can be axial projections, such as bolts or cams or the like, and axial recesses, for example bores, wherein the projections protrude into the recesses, so that the coupling structure is connected to the sieve stars in a rotationally immovable manner by this engagement.
  • the coupling structure and the respective sieve star preferably engage with each other axially multiple times by means of the coupling elements and coupling counter-elements distributed around the first axis of rotation and form a joint on the respective end face of the coupling structure.
  • the respective joint can meander around the axis of rotation at the base of the gap, with features disclosed in connection with the direct coupling also being advantageous for the joints of the indirect coupling.
  • the respective sieve star can have projections on an inner circumference, for example, which protrude radially inwards.
  • the coupling structure can have axial projections of an adapted shape on the end faces, which protrude axially between the radial projections of the respective sieve star.
  • the coupling structure has an outer peripheral surface which forms the gap base over at least the majority of its axial length and extends axially into the foot region of the respective sieve star, so that a first joint is obtained between the coupling structure and the first sieve star, running around the axis of rotation, and a second joint is obtained between the coupling structure and the second sieve star, running around the axis of rotation, and the outer peripheral surface of the coupling structure remains axially free between the joints.
  • the two side joints can be very narrow. They can simply run smoothly around the coupling structure.
  • the sieve stars can be plugged axially onto the coupling structure and surround the coupling structure at the front ends with a pressing force. The joint width can thus be made practically "zero".
  • the lateral joint extends around the free outer circumferential surface of the coupling structure in an axial plan view of the respective screen star and thus extends from the gap base in an axial direction into the screen star.
  • the lateral joints do not extend radially inwards from the gap base, so that the phenomenon of the winding material being drawn in does not act parallel to the alignment of the joint.
  • the coupling structure can have an outer circumferential surface which forms the gap base over at least the majority of its axial length and rises in an arc shape in the direction of the respective sieve star.
  • the free outer circumferential surface of the coupling structure rises continuously in an arc shape up to the respective gap over an arc angle of preferably more than 10° or at least 20°.
  • the coupling structure can in particular be a coil-shaped body.
  • the two aspects - the pronounced, arched, rising course of the gap base and the coupling - can each be implemented individually or advantageously in combination.
  • One or more of the features disclosed under one aspect can also be implemented in a screening device according to the other aspect.
  • the screening device can also comprise a third screening star which is arranged to be rotatable about a second rotation axis extending radially next to the first rotation axis and has a plurality of fingers distributed around the second rotation axis which protrude from a base region of the third screening star to a free peripheral end away from the second rotation axis and which, when the third screening star rotates, successively protrude into the gap remaining between the base region of the first screening star and the base region of the second screening star up to close to the bottom of the gap.
  • a third screening star which is arranged to be rotatable about a second rotation axis extending radially next to the first rotation axis and has a plurality of fingers distributed around the second rotation axis which protrude from a base region of the third screening star to a free peripheral end away from the second rotation axis and which, when the third screening star rotates, successively protrude into the gap remaining between the base region of the first screening star and the base region of the second screening star
  • the invention relates not only to the screening device, but also to a screening star as such.
  • the screening star comprises a hub which defines an axis of rotation of the screening star and has a plurality of elastically flexible fingers distributed around the axis of rotation, each of which protrudes radially outward from a foot region close to the hub to a free peripheral end.
  • the hub has a hub collar which protrudes axially over the fingers to a hub face.
  • the hub collar has an outer circumferential surface that increases monotonically in the radial direction up to at least one root circle of the fingers. If the screen star has a screen star width B measured axially over the whole, the outer circumferential surface of the hub collar increases monotonically over an axial length L > 0.1•B with a radius of curvature K in the direction of the root circle of the fingers. For the radius of curvature K, B > K > 0.1•B applies everywhere over the length L.
  • the outer circumferential surface of the hub collar can advantageously rise beyond the root circle of the fingers into the root area of the fingers with a radius of curvature K for which the relation B > K > 0.1•B applies.
  • the hub collar has several coupling elements and axial recesses in the circumferential direction between the coupling elements.
  • the coupling elements protrude freely axially in the direction of the hub face, distributed around the axis of rotation.
  • a free outer circumferential surface of the hub collar runs over the coupling elements to the hub face.
  • the hub collar can advantageously be formed with the coupling elements and recesses in the manner of a coupling half of a claw coupling.
  • the outer circumferential surface of the hub collar can in particular correspond to one or more of the features disclosed under the first aspect in order to be able to form a side section of the gap base of the screening device according to the first aspect. In the relations there, the width B then replaces the center distance D.
  • Figure 1 shows a screening device 1 with a first arrangement of screening stars arranged next to each other along a common first axis of rotation 2, and a second arrangement of screening stars arranged next to each other along a second axis of rotation 3.
  • the axes of rotation 2 and 3 extend next to one another at a distance and are at least substantially, preferably exactly, parallel.
  • the sieve stars of the first sieve star arrangement are arranged so as to be rotationally immobile relative to one another and can rotate together about the axis of rotation 2.
  • the sieve stars of the second sieve star arrangement are arranged so as to be rotationally immobile relative to one another and can rotate together about the axis of rotation 3.
  • the sieve stars of the first sieve star arrangement are arranged on a common carrier 4, which axially penetrates the sieve stars in the area of each sieve star hub.
  • the sieve stars of the second sieve star arrangement are arranged on a second carrier 5, which axially penetrates these sieve stars centrally, in the area of each sieve star hub.
  • the carrier 4 forms a shaft or is a component of a shaft, by means of which the sieve stars of the first arrangement are mounted in or on a frame of the sieving device 1 so as to be rotatable about the common axis of rotation 2.
  • the carrier 5 also forms a shaft or is a component of a shaft, by means of which the sieve stars of the second arrangement are mounted in or on the frame of the sieving device 4 so as to be rotatable about the common axis of rotation 3.
  • the supports 4 and 5 have a non-circular outer circumference, in the embodiment they are polygonal, in the special case rectangular profiles.
  • the sieve stars each have a hub with a passage corresponding to the outer circumference of the supports 4 and 5, which is adapted to the outer circumference of the respective support 4 and 5 at least to such an extent that when the support 4 or 5 and the sieve star hub engage, a rotationally immobile engagement is achieved for the transmission of a torque.
  • the first sieve star arrangement comprises a first sieve star 7 and an axially adjacent second sieve star 8 as well as further sieve stars not designated in more detail.
  • the second sieve star arrangement comprises a third sieve star 9 and further sieve stars not designated in more detail.
  • An axial gap remains between the axially adjacent sieve stars of the first sieve star arrangement and between the axially adjacent sieve stars of the second sieve star arrangement.
  • the sieve stars of the first sieve star arrangement are axially offset in relation to the sieve stars of the second sieve star arrangement so that the sieve stars of one sieve star arrangement each protrude into the axial gaps of the other sieve star arrangement and a comb-like engagement of the sieve star arrangements is achieved.
  • the third sieve star 9 engages in the gap that remains between the oppositely arranged sieve stars 7 and 8.
  • Figure 2 shows the meshing engagement of the sieve stars in a top view using the example of the engagement of the sieve star 9 in the gap between the sieve stars 7 and 8.
  • the respective fingers 11 of the sieve star 9 with a peripheral end 13 in the radial direction up to close to a gap base 20 of the gap laterally delimited by the sieve stars 7 and 8.
  • the gap base 20 is understood to be the free outer circumferential surface of the sieve star arrangement with the sieve stars 7 and 8, which faces radially towards the peripheral end 13 of the respective finger 11.
  • the gap base 20 rises towards the sides of the gap with a round, arched course. The arched contour of the gap base 20 will be discussed below.
  • the fingers 11 of the sieve stars taper continuously radially outwards, towards the peripheral ends 13. In the example, the fingers 11 taper conically.
  • the sieve stars therefore lie opposite one another with their side surfaces axially and not plane-parallel.
  • the sieve stars which interlock in a chamber-like manner, form only a narrow, linear gap with their side surfaces. This counteracts the so-called disc formation, which can occur particularly with wet sieving material that is covered with soil.
  • the sieve stars each have at least one cleaning finger 11 with a cleaning element 40.
  • the cleaning elements 40 are made of a material that is harder and more wear-resistant than the material of the fingers 11.
  • the cleaning elements 40 can in particular consist of a metal including a metal alloy.
  • the cleaning finger 11 of the respective sieve star differs from the other fingers 11 of the same sieve star only in relation to the cleaning element 40.
  • the cleaning elements 40 serve to prevent sieving material from settling on the gap base 20 of the sieve star gaps.
  • the respective cleaning element 40 acts like a scraper that scrapes adhering sieving material off the gap base 20.
  • Figure 3 shows the first sieve star 7 in a front view as an example for the second sieve star 8 and the third sieve star 9 as well as other sieve stars of the sieve device 1.
  • the sieve stars are so similar that they can be exchanged for one another. They are preferably identical in terms of geometry and material.
  • the sieve star 7 has a hub 10 with a passage 16 for the carrier 4.
  • the non-circular cross-section of the passage 16 can be seen, which is rectangular in the exemplary embodiment and ensures that the sieve star 7 sits immobile on the carrier 4.
  • the fingers 11 of the sieve stars arranged along a common axis of rotation are aligned in the axial direction.
  • the sieve stars can be offset along the respective axis of rotation around the axis of rotation in their rotation angle positions.
  • every second sieve star can be arranged in a rotational angle position that is offset in the circumferential direction from its axially adjacent sieve stars, so that the fingers 11 of these sieve stars are no longer axially aligned with the fingers 11 of the other sieve stars, but are arranged with a gap in the axial view, for example.
  • the sieve stars differ in relation to the rotational angle position of the inner circumference 16 relative to the fingers 11.
  • the rotational angle offset can be implemented directly in the elastomer or rubber material of the sieve stars. If the inner circumference 16 is formed by a metal insert body or a plastic insert body made of a more resistant material than that of the fingers 11, the sieve stars can be identical in shape in the area of the elastomer or rubber material and different insert bodies can be used for the rotational angle attachment.
  • each sieve star of the sieve device can be equipped with a cleaning element 40.
  • the sieve star 7 has the several fingers 11 distributed around the rotation axis 2 in the circumferential direction, which protrude from a foot area 12 of the sieve star 7 radially outward to the free peripheral end 13 away from the first rotation axis 2.
  • the fingers 11 can, as in Figure 3 recognizable, protrude in a sickle shape, with the peripheral end 13 of the respective finger 11 following the foot region 12 of the same finger 11 in relation to the direction of rotation.
  • the direction of rotation is indicated by a direction of rotation arrow.
  • the foot region 12 of the sieve star 7 can form part of the hub 10 or protrude radially outwards from the hub 10.
  • a foot circle 15 extends around the axis of rotation 2, which connects the radially deepest points in the gaps between adjacent fingers 11.
  • the foot region 12 thus also forms a root or foot region of the fingers 11.
  • the fingers 11 are flexible, with the flexural rigidity being adapted to the material to be screened.
  • screen stars with fingers are used which advantageously have a lower flexural rigidity and/or lower hardness than the fingers of screen stars used for screening soil-stone mixtures.
  • the sieve star 7 can consist of a rubber or an elastomeric material, including an elastomeric composite material, in particular in the area of the fingers 11 and preferably also in the base area 12 and optionally also in the area of the hub 10.
  • a reinforcing body for example a metallic reinforcing body, can be embedded in the area of the hub 10 in order to improve the torque transmission from the carrier 4 or to the carrier 4 and/or to counteract wear in this area and/or to support the fingers 11 in the base area of the respective sieve star.
  • the sieve stars each have at least one axially projecting coupling element 22 and correspondingly at least one axial recess 23 on both end faces of their hubs 10, distributed in the circumferential direction around the axis of rotation 2, so that the coupling element 22 of one sieve star engages in the axial recess 23 of the axially adjacent sieve star.
  • the sieve stars each have a plurality of axially projecting coupling elements 22 in the form of projections, distributed in the circumferential direction, and an axial recess 23 between the coupling elements 22 adjacent in the circumferential direction.
  • the recesses 23 form gaps between coupling elements 22 adjacent in the circumferential direction.
  • the sieve stars arranged along the common axis of rotation 2 such as the sieve stars 7 and 8 along the axis of rotation 2, are arranged axially directly next to one another without an intermediate piece. In particular, they can be arranged axially abutting.
  • the adjacent sieve stars engage in the area of their hubs 10 with the coupling elements 22 and recesses 23 in the axial direction in a claw-like manner.
  • a meandering engagement joint 24 is obtained, which can be formed as a butt joint, particularly with respect to the axial direction.
  • the sieve stars 7 and 8 are therefore coupled via the joint 24 in a rotationally immovable manner by means of a direct coupling 25.
  • the meandering course of the engagement joint 24 in the circumferential direction around the axis of rotation 2 prevents windable material, such as long-fiber material, ropes, cords and tights, from being drawn into the joint 24 between the adjacent sieve stars.
  • Windable sieve material can wind around the gap base 20 between sieve stars adjacent along the same axis of rotation, with the one or more windings then having a tendency to contract more tightly when the sieve star arrangements rotate. In the case of flat joints that point perpendicular to the respective axis of rotation, this can lead to the winding(s) being drawn into the joints.
  • the meandering course of the engagement joint 24 counteracts this.
  • This effect is counteracted by the special shape of the respective gap base 20, i.e. by a special course of the outer circumferential surface forming the gap base 20.
  • the gap base 20 rises monotonically towards the sides, towards the foot area 12 of the respective screen star, with a round, arched course.
  • the gap base 20 thus becomes monotonically slimmer as it progresses from the sides to the middle.
  • the tendency of the winding(s) to contract more tightly when the screen stars rotate is used to drive the winding(s) from the lateral end regions of the gap base 20 towards the center of the gap base 20.
  • Figure 4 shows the sieve star 7 in the Figure 3 entered longitudinal section AA.
  • the section contains the axis of rotation 2 and runs from there straight and tangentially along two coupling elements 22 and from there radially outwards following the course of two fingers 11.
  • the hub 10 forms a hub collar 17 on both sides of the fingers 11, which extends from a left and a right hub face 18 on both sides axially to the foot area 12 and also includes the coupling elements 22.
  • the hub faces 18 mark the respective front end of the sieve star 7.
  • the hub collar 17 forms part of the gap base 20 ( Figure 2 ).
  • the hub collar 17 of the sieve star 7 forms the gap base 20 between the sieve stars 7 and 8 with a hub collar 17 of the sieve star 8 arranged adjacently in a mirror image.
  • the gap base 20 rises monotonically with a radius of curvature K everywhere over an axial length L, as seen from the front end in the direction of the fingers 11.
  • the monotonous rise begins in the area of the coupling elements 22.
  • the radius of curvature K can vary over the course of the rise and is preferably described by a continuous function in such embodiments. In the exemplary embodiment, however, the radius of curvature K is constant over the length L of the rise.
  • the outer circumferential surface of the hub collar 17 and also the gap base 20 are thus a circular arc section in every longitudinal section.
  • the left and right hub collars 17 of the sieve star 7 are in terms of their outer circumferential surfaces and also in terms of the Coupling elements 22 and recesses 23 are the same, whereby the coupling elements 22 of the left hub collar 17 and the coupling elements 22 of the right hub collar 17 can be aligned in the axial direction or offset from one another in the circumferential direction.
  • the hub collar can have a cylindrical outer circumferential surface over the axial length of the coupling elements 22, so that the rounded curve of the hub collar 17 only extends to the recesses 23.
  • the round rise occurs uniformly everywhere over the axial length L and a radial height H in the sense that the contour of the outer circumferential surface of the hub collar 17 can be continuously differentiated up to the height H.
  • the uniformly curved course can be achieved as in the exemplary embodiment by means of a constant radius of curvature K or, as mentioned above, with a continuously changing radius of curvature K.
  • the contour of the outer circumferential surface can be composed of several axial sections with different radii of curvature placed next to one another over the length L or overall, whereby the course, which cannot be continuously differentiated, is at least so uniform that no corner-shaped areas arise in which windable screening material can collect. It is also advantageous if the outer circumferential surface of the hub collar 17 rises in a curved manner so far that it runs tangentially into the side surfaces of the fingers 11.
  • L > 0.15•B applies.
  • K in particular, K > 0.15•B applies.
  • 0.5•B > K or 0.3•B > K applies.
  • the uniformly curved monotonous rise extends beyond the base circle 15 into the base area of the respective finger 11 up to a curvature limit 19 which runs at the radial height H.
  • the Figures 5 and 6 show two sieve stars of a sieve device of a second embodiment arranged next to each other along a common axis of rotation 2.
  • the sieve stars of the second embodiment differ from the sieve stars of the first embodiment only in that their fingers 11 do not taper in the direction of the peripheral ends 13, but have at least essentially the same axial width from the respective foot region 12 to the peripheral end 13. Apart from that, there are no differences from the first embodiment, so that the two sieve stars shown are referred to as sieve star 7 and sieve star 8.
  • a center distance D is given to measure the arched, monotonous rise of the gap base 20 towards the sides.
  • the center distance D is the axial distance between the axial centers of the adjacent screen stars 7 and 8. If the adjacent screen stars 7 and 8 abut directly against each other axially in the area of the engagement joint 24, the center distance D corresponds to the screen star width B ( Figure 4 ).
  • the gap base 20 is divided into a central section 21, a left side section axially connected to it and a right side section axially connected to the central section 21 on the other side.
  • the axial length L is entered for each of the two side sections.
  • the following relations apply to the axial length L, i.e. the length of the respective side section, with regard to the curved rise of the contour of the gap base 20: L > 0.1 ⁇ D D > K > 0.1 ⁇ D .
  • L > 0.15•B applies.
  • K in particular, K > 0.15•D can apply.
  • 0.5•D > K or 0.3•D > K applies.
  • the middle section 21 extends in the axial direction from the base of the axial recesses 23 of the sieve star 7 to the base of the axial recesses 23 of the sieve star 8 and extends in particular over the axial length of the coupling elements 22 or a longest of the coupling elements 22, should the coupling elements 22 be of different lengths.
  • the middle section 21 is delimited in the plan view by two imaginary straight lines that enclose the recesses 23 on the left and right, i.e. are adjacent to them.
  • the gap base 20 is curved in the direction of the middle of the gap between the sieve stars 7 and 8 in each case up to at least the middle section 21 in accordance with the invention.
  • the gap base 20 can be cylindrical, in particular circular-cylindrical, as already mentioned.
  • the gap base 20 is preferably also curved in the middle section 21 in accordance with the invention.
  • the round, curved course thus preferably continues up to the hub face 18 and thus also into the middle of the gap base 20, so that the gap base 20 satisfies the relations referred to above with respect to the center distance D over its entire axial length, and on the sides preferably up to or beyond the root circle 15.
  • the gap base 20 formed according to the invention extends in the second embodiment to both sides over an arc angle of approximately 90°, in the example even over a Arc angle that is slightly larger than 90°.
  • the gap base 20 can describe a quarter circle on both sides, so that the axial length L and the radial height H are the same.
  • the respective hub collar 25 does not run out exactly axially in the area of the coupling elements 22, but rises slightly again in the area of the coupling elements 22 to the hub face 18.
  • the gap base 20 thus has its narrowest cross-section within the middle section 21, ie in the area of the engagement joint 24.
  • the screen stars arranged along the same axis of rotation engage axially with one another and are thus directly coupled to one another.
  • the screen stars are each shaped like one half of a claw coupling and interact in mutual engagement like a claw coupling.
  • torque is transmitted, thus relieving the rotationally immobile engagement with the respective shaft.
  • the respective shaft could also serve as a simple support shaft and the torque could only be transmitted in the coupling between the screen stars by means of the coupling elements 22 and recesses 23.
  • the coupling counteracts the pulling in of winding material to be screened due to the different course of the gap 24 in the circumferential direction.
  • Figure 7 shows a screening device with a first screening star 37 and a second screening star 38, which are arranged next to each other along a common axis of rotation 2.
  • the screening stars 37 and 38 do not engage directly with each other, but are indirectly coupled to each other by means of a coupling structure 30.
  • the coupling structure 30 is connected to the screening star 37 on one of its two end faces and to the screening star 38 on the other end face, each in a positive engagement, i.e. directly coupled to the respective screening star.
  • the coupling structure 30 forms with its free outer circumferential surface the gap base 20 or at least a predominant part of the gap base 20.
  • the gap base 20, as far as formed by the coupling structure 30, has a continuously curved course from the sieve star 37 to the sieve star 38 and corresponds at least to the basic relations disclosed on the basis of the direct coupling and preferably also to one or more of the additionally disclosed relations for the length L and/or the radius of curvature K.
  • the coupling structure 30 has several axially projecting coupling elements 32 distributed on its two end faces around the axis of rotation 2 and the sieve stars 37 and 38 have corresponding coupling counter-elements 33, for example axial recesses, which are formed as axial passages in the exemplary embodiment.
  • the coupling elements 32 can be, for example, axially projecting bolts or other axially projecting shaped elements.
  • the coupling structure 30 extends with an axial end section 31 into the sieve star 37 and on the other side with a similar axial end section 31 axially into the sieve star 38.
  • the sieve stars 37 and 38 each have a collar 34 on their front sides with an inner cross section that is adapted to the outer cross section of the axially protruding end section 31, so that a narrow gap remains around the end sections 31 between the respective end section 31 and the collar 34.
  • the gap width of the circumferential gap can be made "zero" so to speak by the coupling structure 30 extending with its axial end sections 31 into the respective collar 34 with a certain press fit. However, a positive coupling without frictional engagement or with at most a very low frictional engagement component is preferred.
  • the coupling elements 32 protrude from the axial end section 31 on the respective front side and into the associated coupling counter-elements 33 of the sieve stars 37 and 38.
  • the gap formed between the respective axial end section 31 and the associated collar 34 can be very narrow. It is particularly advantageous that the circumferential joints are at least substantially orthogonal to the radial forces responsible for drawing in the winding-capable screening material.
  • a third sieve star 39 is also shown meshing in the gap between the sieve stars 37 and 38.
  • the axial end sections 31 are directly connected to the gap base 20 on the left and right.
  • the end sections 31 can easily extend the axial section of the coupling structure 30, which forms the gap base 20, axially over a short distance.
  • the gap base 20 or the free circumferential surface of the coupling structure 30 and the end faces of the sieve stars 37 and 38 are advantageously shaped to fit snugly against one another, so that a continuous, smooth transition from the sieve star end face to the gap base 20 is achieved via the two circumferential joints.
  • the sieve stars 37 and 38 of the Figure 7 correspond in terms of their fingers 11 to the embodiment of the Figures 1 to 4
  • the fingers 11 of the sieve stars thus taper towards their peripheral ends 13.
  • Figure 8 shows a screening device with a screening star 37, a screening star 38 and a screening star 39 engaging in the gap remaining between them.
  • the screening stars 37 and 38 are as in the embodiment of the Figure 7 coupled to each other via a coupling structure 30.
  • the explanations for the embodiment of the Figure 7 equally.
  • the embodiment of the Figure 8 differs from the embodiment of the Figure 7 only in that the front surfaces of the sieve stars 37 to 38 are at least essentially plane-parallel, thus in this respect the embodiment of the Figures 5 and 6 are equivalent to.
  • Figure 9 shows the coupling structure 30 of the screening device of the Figure 7 in a side view.
  • the coupling structure 30 forms the gap base 20 or at least a predominant part of the gap base 20 between its two axial end sections 31.
  • the concave gap base 20 formed by the coupling structure 30 has a constant radius of curvature K from end section 31 to end section 31.
  • the end sections 31 each have the shape of a flat circular cylinder.
  • Several joining elements 32 protrude axially from the two free end faces of the end sections 31.
  • Figure 10 shows the sieve star 38 of the Figure 7 and the coupling structure 30 in the connected state in an isometry.
  • the coupling structure 30 is connected to the sieve star 38 in a rotationally immovable manner by the Figure 9 from the right end section 31 protruding joining elements 32 engage in the adapted coupling counter-elements 33 of the sieve star 38 formed as recesses, as shown in the section of the Figure 7 is shown.
  • the coupling structure 30 has, analogously to the sieve star 38, a passage 36 for a rotationally immovable coupling with a shaft of the sieve device.
  • the rotationally immovable coupling directly between the coupling structure 30 and the sieve star 38 improves the torque transmission by relieving the rotationally immovable coupling of the sieve star 38 and the coupling structure 30 with the shaft.

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EP23201651.9A 2022-10-04 2023-10-04 Dispositif de tamisage pour cribler un produit à tamiser et étoile de criblage pour dispositif de tamisage Pending EP4349499A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202022105599.8U DE202022105599U1 (de) 2022-10-04 2022-10-04 Siebvorrichtung zum Sieben eines Siebguts und Siebstern für eine Siebvorrichtung

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EP4349499A1 true EP4349499A1 (fr) 2024-04-10

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EP23201651.9A Pending EP4349499A1 (fr) 2022-10-04 2023-10-04 Dispositif de tamisage pour cribler un produit à tamiser et étoile de criblage pour dispositif de tamisage

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DE (2) DE202022105599U1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1679593A (en) * 1927-04-29 1928-08-07 Herbert C Williamson Rotary grizzly screen
US6241100B1 (en) * 1999-08-31 2001-06-05 E. M. Tanner & Sons, Inc. Laterally reinforced produce roller
EP1088599B1 (fr) 1999-10-01 2002-05-02 Bernd Günther Elément de tamis rotatif et procédé pour le nettoyage de tamis rotatifs
CN203304161U (zh) * 2013-06-22 2013-11-27 辽宁北方电力机械成套设备有限公司 一种滚轴筛
US10124370B2 (en) * 2007-08-30 2018-11-13 Pellenc (Societe Anonyme) Sorting table with sorter rolls for elimination of foreign matter remaining mixed in a harvest of small fruit
CN109894346A (zh) * 2019-03-15 2019-06-18 安徽华星选矿科技有限公司 一种正弦滚轴筛筛轴、筛轴降温装置及其轴承润滑油口
CN209886133U (zh) * 2019-03-15 2020-01-03 安徽华星选矿科技有限公司 一种用于滚轴筛可拆卸式筛滚结构
EP3628411A1 (fr) 2018-09-14 2020-04-01 Günther Holding GmbH & Co. KG Tamis-étoile pour un dispositif tamis
WO2020254730A1 (fr) * 2019-06-20 2020-12-24 Tana Oy Pièce coulée et ensemble arbre pour un tamis à disques

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1679593A (en) * 1927-04-29 1928-08-07 Herbert C Williamson Rotary grizzly screen
US6241100B1 (en) * 1999-08-31 2001-06-05 E. M. Tanner & Sons, Inc. Laterally reinforced produce roller
EP1088599B1 (fr) 1999-10-01 2002-05-02 Bernd Günther Elément de tamis rotatif et procédé pour le nettoyage de tamis rotatifs
US10124370B2 (en) * 2007-08-30 2018-11-13 Pellenc (Societe Anonyme) Sorting table with sorter rolls for elimination of foreign matter remaining mixed in a harvest of small fruit
CN203304161U (zh) * 2013-06-22 2013-11-27 辽宁北方电力机械成套设备有限公司 一种滚轴筛
EP3628411A1 (fr) 2018-09-14 2020-04-01 Günther Holding GmbH & Co. KG Tamis-étoile pour un dispositif tamis
CN109894346A (zh) * 2019-03-15 2019-06-18 安徽华星选矿科技有限公司 一种正弦滚轴筛筛轴、筛轴降温装置及其轴承润滑油口
CN209886133U (zh) * 2019-03-15 2020-01-03 安徽华星选矿科技有限公司 一种用于滚轴筛可拆卸式筛滚结构
WO2020254730A1 (fr) * 2019-06-20 2020-12-24 Tana Oy Pièce coulée et ensemble arbre pour un tamis à disques

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DE102023127003A1 (de) 2024-04-04

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