EP2340130A1 - Siebmaschine - Google Patents
SiebmaschineInfo
- Publication number
- EP2340130A1 EP2340130A1 EP09784052A EP09784052A EP2340130A1 EP 2340130 A1 EP2340130 A1 EP 2340130A1 EP 09784052 A EP09784052 A EP 09784052A EP 09784052 A EP09784052 A EP 09784052A EP 2340130 A1 EP2340130 A1 EP 2340130A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- screen
- sieve
- electrically conductive
- screening machine
- fabric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
- B07B1/30—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens jigging or moving to-and-fro within their own plane in or approximately in or transverse to the direction of conveyance
-
- 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
-
- 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
- B07B13/18—Control
Definitions
- the invention relates to a sieve for a screening machine for screening a product in at least two fractions.
- Sieving machines and sieves in particular for separating mealy products or for cleaning bran, are known per se.
- a finer fraction can penetrate the sieve cloth (sieve passage), while the coarser fraction is discharged as a sieve shake.
- a mesh fabric plastic mesh or metal wire mesh for flour sifting are used as a mesh fabric plastic mesh or metal wire mesh for flour sifting.
- a radiation should be directed to the mesh and the reflective portion should be measured.
- the measured value should be a function of the remaining thickness of the screen or the absolute abrasion of the wire mesh wires, i. H. in particular be metal wires.
- a signal should be triggered indicating the required screen change.
- a screen fabric of plastic fibers on additional electrically conductive threads, in particular carbon fibers in one direction, which are laterally spaced from each other and with the sieve in axial Direction are curious.
- Conductivity measurements should reliably enable error monitoring (eg screen breakage).
- the electrically conductive fibers form an electrode arrangement whose conductivity changes when at least one thread breaks, which is used as a detection signal. Damage to the plastic fibers, in particular longitudinal cracks, may not be detectable at all or too late. It is further proposed to be able to use other physical variables analogously.
- DE-U-6751332 and DE-OS 2326306 it is known from DE-U-6751332 and DE-OS 2326306 to completely surround woven plastics materials with metallic layers, in particular of silver or copper, in order to increase the strength and rigidity of these fabrics.
- the layer thicknesses are about 20-100 ⁇ m.
- DE-C-3227020 discloses the sticking of insulated wire threads on a wire, DE-A-2443548 the incorporation of electrical control threads in fabric panels. It is stated in DE-A-4324066 that such threads can lead to a hardening and thus increased susceptibility to breakage of the tissue.
- the invention has for its object to provide a sieve for a screening machine, which allows a simple and safe tektieren detection of cracks or breaks in the sieve (in particular of plastic fibers).
- the object is achieved by the features of the independent claims.
- a sieve according to the invention has a sieve surface made of plastic, preferably of plastic fibers.
- Plastics are here and below understood to mean materials whose essential constituents consist of such macromolecular organic compounds which are formed synthetically or by modification of natural products.
- the screen surface may preferably be a screen fabric made of plastic; also a screen surface with through openings that are not formed by a fabric (for example, due to punched holes in a fabric), but can be used according to the invention.
- the screen surface or the screen fabric here is at least partially provided with an electrically conductive layer, in particular a metallic layer.
- the electrical conductivity of metals which are preferably used as an electrically conductive layer, is usually larger by some orders of magnitude than that of plastics.
- the electrically conductive layer makes it possible to measure the electrical resistance along this layer continuously or periodically. It has been found that electrical resistance can be used very reliably as a criterion for the quality of the screen, since damage to the screen structure results in a measurable change in the electrical resistance. In this case, damage to the screen structure is understood to mean, in particular, both the formation of cracks and the complete severing of boundaries of the passage openings of the screen, in particular of warp / weft threads, as well as the wear and tear (thickness reduction). Sieve wear as well as incipient destruction by injury or penetration of the sieve fabric (hole, crack or break) can be detected.
- o polyamides PA
- PA polyamides
- PA PA6
- PA66 PA66
- polyalkylenes in particular o polyethylene (PE), preferably of high density (HDPE), o polypropylene (PP), o polyethylene / polypropylene copolymers (PE / PP);
- Polyester in particular o polyethylene terephthalate (PET), o polybutylene terephthalate (PBT).
- the metal (s) of the electrically conductive layer is / are selected from the group consisting of silver, titanium, chromium, and mixtures thereof. Silver is particularly preferred because of the extraordinarily high conductivity of 61 ⁇ 10 5 S / m, since this makes the detectable absolute changes in the conductivity greater.
- the electrically conductive layer is not over the entire surface of the screen surface, in particular the screen fabric is formed.
- a coating is possible only in particularly stressed partial areas.
- the invention can be further improved by designing the electrically conductive layer as a conductor track.
- Conductor tracks are understood here and below to be electrically conductive connection paths between defined points. The resistance measurement is thereby considerably simplified, since with a suitable arrangement the track must only qualitatively between "conductive” and “non-conductive” must be distinguished.
- the conductor track is preferably arranged such that it extends substantially at an angle ⁇ 0 ° to the boundaries of the screen openings, in particular at an angle ⁇ 0 ° to warp threads and / or weft threads of the plastic fabric; "Substantially” here means that in particular in direction reversal areas of, for example, a meandering arranged conductor track in limited subareas, in particular an arrangement along warp and / or weft threads is possible
- the conductor track is designed in such a way that it is in the Essentially at an angle of approximately 30 ° to approximately 60 ° (preferably at an angle of approximately 45 °) to the boundaries of the screen openings, in particular to warp threads and / or weft threads of the plastic fabric
- damage can be detected in all directions, in particular longitudinally and / or transversely to the direction of the weft / warp threads
- the track can in particular be arranged in such a way that damage can be detected in all directions, in
- the electrically conductive layer is formed homogeneously, ie in particular with respect to (individually or in combination) of the material, the structure, the thickness, the width.
- a sieve according to the invention can be designed, in particular, as a round sieve sheath, in which a reel work can be arranged in a rotatable manner.
- Suitable methods for producing a sieve described above are known per se.
- Methods for applying metallic layers to tissue for example by vapor deposition, sputtering (cathode sputtering) or plasma spraying (PVD)) according to step ii) are known, in particular, from EP 925 196 B1; the disclosure of which is incorporated by reference into the description of the present invention.
- a screen according to the invention as described above finds particular use in a screening machine.
- Another aspect of the invention thus relates to a screening machine comprising a sieve as described above.
- Screening machines are understood in this context, in particular drum screens and Plansichter.
- Another aspect of the invention relates to a method for operating a screening machine, wherein the electrical resistance of the electrically conductive, in particular metallic layer is measured continuously or periodically.
- the resistance measurement can be carried out with constant current or constant voltage.
- the quality of the sieve can then be determined.
- the invention also relates to a method of servicing a screening machine, comprising the step of replacing a screen as described above, which has damage or wear, by a screen without damage or wear, in particular as described above. It has also been found that the coating (in particular a full-surface coating) may already be suitable for reducing the wear on the screen fabric.
- the sieve is preferably tensioned in the radial direction. Round or drum sieves as well as flat, flat sieves can be detected.
- the sieve surface or the sieve fabric is fastened in particular to a frame, preferably stretched on a frame.
- the sieve can preferably also be equipped with electrical connections (for example sockets, plugs, or the like) via which the resistance measurement, in particular along the conductor track, is made possible.
- the inventive sieve can also be used in building openings of silos or mills, z. B. by clamping on windows to detect damage to these openings can.
- Fig. 1 a drum screen
- FIG. 2 shows a metallic fabric coating in a schematic representation
- Fig. 3 tissue in schematic representation
- Fig. 4 enlarged detail of Fig. 2;
- Fig. 5 measuring arrangement.
- a drum screening machine shown in FIG. 1 has a product inlet 1 in a screening jacket 2. Within the screen shell 2, a rotating beater mechanism 3 is arranged, which is driven by a motor 4 with belt transfer 5.
- the product is thrown against the screen jacket 2 by the rotating beater mechanism 3.
- the finer product passes through the screen jacket 2 and enters a diarrhea outlet 6, the coarser product leaves the screening jacket 2 or the drum screening machine through a discharge outlet 7.
- the screening jacket 2 When sieving / spinning flour, a product mixture that is difficult to separate is spotted and the screening jacket 2 has a support basket which is surrounded by a screen fabric made of polyester or polyamide threads.
- the layer thickness of the conductor track is in the nanometer range, in particular in the range of about 20 to 800 nm, preferably from 60 to 650 nm, particularly preferably from 100 to 500 nm.
- FIG. 3 shows a square fabric of warp threads 10 and weft threads 11 to illustrate a possible fabric structure of a wire 9.
- FIG. 4 schematically shows an enlarged section of FIG. 2, whereby the warp and weft threads are also shown.
- known methods can be used for the coating known methods.
- FIG. 5 shows an exemplary experimental setup for measuring a screen (9) coated over the entire surface.
- the screen On the right side of the diagram, the screen is connected to a voltage source.
- the fully coated sieve has a resistance Rl in the perfect condition.
- a damaged screen showing a crack, breakage or abrasion shows a resistance R2 ⁇ Rl. Interruptions result, for example, in an increase in resistance, whereas local shorts in one
- a screening machine with a flat or round screen, the screen comprising a screen of plastic fibers, and the screen being at least partially provided with a metallic layer;
- a screening machine as described in a), wherein the layer is formed like a conductor in the form of a resistance coil;
- a screening machine as described in a), b) or c), wherein the layer consists of silver or titanium;
- a screening machine as described in a), b) or c), characterized in that the sieve is designed as a round screen jacket, in which a racket mechanism is arranged rotatably;
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Woven Fabrics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102008042916A DE102008042916A1 (de) | 2007-12-10 | 2008-10-16 | Siebmaschine |
| PCT/EP2009/063608 WO2010043712A1 (de) | 2008-10-16 | 2009-10-16 | Siebmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2340130A1 true EP2340130A1 (de) | 2011-07-06 |
| EP2340130B1 EP2340130B1 (de) | 2013-04-10 |
Family
ID=41666424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09784052.4A Active EP2340130B1 (de) | 2008-10-16 | 2009-10-16 | Siebmaschine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2340130B1 (de) |
| JP (1) | JP5743892B2 (de) |
| CN (1) | CN102186606B (de) |
| WO (1) | WO2010043712A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489447A (zh) * | 2011-12-02 | 2012-06-13 | 郑州飞机装备有限责任公司 | 用于高方平筛的叠加式筛格 |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2535120A1 (de) | 2011-06-17 | 2012-12-19 | Bühler AG | Sieb und Verfahren für die Herstellung eines Siebes |
| WO2014136121A1 (en) * | 2013-03-07 | 2014-09-12 | Tega Industries Limited | Vibrating screen panel health monitoring system |
| CN106733637A (zh) * | 2017-03-14 | 2017-05-31 | 广东维杰物料自动化系统有限公司 | 筛网、粉体物料或颗粒物料筛分装置及输送系统 |
| CN107243448B (zh) * | 2017-08-11 | 2023-12-01 | 安徽溪瑞食品有限公司 | 一种具有筛选机构的打麸机 |
| EP3659718B1 (de) | 2018-11-29 | 2021-06-16 | ALLGAIER WERKE GmbH | System und verfahren zur überwachung einer siebmaschine |
| CN116989563B (zh) * | 2023-09-21 | 2023-12-01 | 常州创明超电材料科技有限公司 | 一种多孔碳干燥输送设备及其工作方法 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6751332U (de) * | 1968-04-22 | 1969-02-06 | Carl Klingspor | Siebe aus metallisiertem kunststoff-gewebe |
| CH543391A (de) * | 1972-05-26 | 1973-10-31 | Zuericher Beuteltuchfabrik Ag | Siebgewebe aus monofilen Kunststoffasern und Verwendung desselben |
| DE2443548A1 (de) * | 1974-09-11 | 1976-03-25 | Lesk Margarete | Einrichtung zur kontrolle des verschleisses technisch beanspruchter stoffbahnen |
| SE424145B (sv) * | 1980-11-07 | 1982-07-05 | Svedala Arbra Ab | Anordning vid sikt- eller sallapparat for overvakning av sikt- eller sallduk |
| DE4324066C2 (de) * | 1993-07-17 | 1995-11-30 | Reimelt Dietrich Kg | Siebeinrichtung |
| CN2288786Y (zh) * | 1996-04-30 | 1998-08-26 | 黄明均 | 一种金属涤纶过筛网 |
| JP2871677B1 (ja) * | 1998-04-09 | 1999-03-17 | ラサ工業株式会社 | ふるい網破損検知方法ならびにその装置 |
| US6585116B1 (en) * | 2000-02-22 | 2003-07-01 | Voith Sulzer Paper Technology North America, Inc. | Screening apparatus for fiber suspension |
| EP1806185B1 (de) * | 2004-10-18 | 2010-07-07 | Tsukasa Industry Co., Ltd. | Sieb und sichter mit siebbruchdetektor |
| JP2008006383A (ja) * | 2006-06-29 | 2008-01-17 | Turbo Kogyo Co Ltd | 円筒スクリーン式分級機のスクリーン破れ検知装置 |
| JP2008224261A (ja) * | 2007-03-09 | 2008-09-25 | Matsushita Electric Ind Co Ltd | 網破れ検出方法およびふるい分け装置 |
-
2009
- 2009-10-16 JP JP2011531507A patent/JP5743892B2/ja active Active
- 2009-10-16 EP EP09784052.4A patent/EP2340130B1/de active Active
- 2009-10-16 CN CN200980140772.2A patent/CN102186606B/zh active Active
- 2009-10-16 WO PCT/EP2009/063608 patent/WO2010043712A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010043712A1 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489447A (zh) * | 2011-12-02 | 2012-06-13 | 郑州飞机装备有限责任公司 | 用于高方平筛的叠加式筛格 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012505741A (ja) | 2012-03-08 |
| JP5743892B2 (ja) | 2015-07-01 |
| WO2010043712A1 (de) | 2010-04-22 |
| EP2340130B1 (de) | 2013-04-10 |
| CN102186606A (zh) | 2011-09-14 |
| CN102186606B (zh) | 2015-08-19 |
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