EP2384823B1 - Luftstrahlsieb - Google Patents

Luftstrahlsieb Download PDF

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Publication number
EP2384823B1
EP2384823B1 EP11002770.3A EP11002770A EP2384823B1 EP 2384823 B1 EP2384823 B1 EP 2384823B1 EP 11002770 A EP11002770 A EP 11002770A EP 2384823 B1 EP2384823 B1 EP 2384823B1
Authority
EP
European Patent Office
Prior art keywords
sieve
air
air jet
triboelectric
accordance
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.)
Not-in-force
Application number
EP11002770.3A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2384823A1 (de
Inventor
Hans Kaiser (Dipl.-Ing.(FH)
Georg Konetzka (Dipl.Ing. (grad)
Markus Schönwetter
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.)
Hosokawa Alpine AG
Original Assignee
Hosokawa Alpine AG
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Filing date
Publication date
Application filed by Hosokawa Alpine AG filed Critical Hosokawa Alpine AG
Publication of EP2384823A1 publication Critical patent/EP2384823A1/de
Application granted granted Critical
Publication of EP2384823B1 publication Critical patent/EP2384823B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements

Definitions

  • the invention is directed to an air jet screen with a housing, at least one sieve, which is insertable into the housing, with a slot nozzle below the sieve bottom, a drive for the slot nozzle, an air supply to the slot nozzle and an air discharge through the housing from the space below the Sieve bottom and a control device which controls the operation of the screening machine thus formed and a method for operating the air jet screen.
  • Air jet screens of the generic type are used in analysis sieving, to determine finenesses and particle size distributions of dry powdery materials. Analytical screens are being further automated to rule out operator errors and to achieve high measurement accuracy and reproducibility.
  • a generic air jet sieve consists of a housing on which a sieve with a flat sieve bottom is placed.
  • the screen space above the sieve bottom is closed during a screening with a lid.
  • Below the sieve bottom the housing has a free space.
  • a rotatable about the vertical center axis of the screen slit nozzle is arranged.
  • air is blown against the sieve bottom from below by the uniformly rotating slot nozzle.
  • the jet of air blows out the meshes of the screen mesh and swirls up the screenings lying on the screen.
  • the fines of the material to be screened are entrained by the air jet and transported through the screen fabric from top to bottom in the space below the sieve insert and discharged from there from the screening machine.
  • the coarse fractions which are larger than the mesh size of the respective sieve insert, can not pass through the sieve and remain on the sieve fabric after sieving.
  • material can be re-weighed for each sieving.
  • dust measurement in flowing gases is known using the triboelectric effect. It is a qualitative dust measurement. The principle is based on the transfer of charges when two bodies are brought into contact with each other by touch or friction. The charge difference is the basis for the triboelectric measurement. In this way, a qualitative monitoring of the dust concentration can take place and a relative allocation of the particle concentration can take place. An exact assignment The measuring signal for dust concentration is only possible in cases of constant speed.
  • a disadvantage of the already known optical method is the sensitive and costly measurement technique for the optical detection of the amount of particles in the exhaust stream, especially in abrasive products.
  • two components namely transmitter and receiver are necessary. These are separated by means of glass panes of the particle flow, the glass must be kept dust-free, which is very expensive.
  • These measures require a large Bauvolumen._Nachtaria given predetermined screen times, even if they differ for screens with different Siebmaschenweiten and different materials, is that depending on the Siebmaschenweite the material to be screened for different lengths sieved, which is e.g. for non-abrasion-resistant materials leads to different stress on the substance and to a falsification of the measurement result.
  • the invention is therefore an object of the invention to provide a solution that allows the sieve progress in a screening with an air jet sieve to determine the screening time.
  • the object is achieved in that the screening machine has a measuring probe, are triboelectrically detectable by the particles in the flow direction after the sieve bottom.
  • a crucial process parameter for screening is the sieving time.
  • the sieving time of a sieving influences its separation limit and selectivity. Ideally, the sieving time is chosen so that only material which is larger than the Siebmaschenweite, lying on the screen, and thus no material is present in the extracted air flow more. Since the material to be screened has no ideal behavior, for. B. no constant samples are processed, is not resistant to abrasion, is sticky, electrostatically charged, the grain shape deviates from the ball, a screening can take forever. The sieving time is too depending on the mesh size of the selected screen. The sieving time of screens with sieves of large mesh size is less than that with small mesh size.
  • the sieving time must not be too long, as otherwise sensitive products are subjected to excessive stress and comminution or abrasion processes occur during sieving. From the economic point of view, the sieving time should be as short as possible, but at the same time the screenings should be representative and repeatable.
  • it is provided to equip an air-jet screen with a measuring technique which makes it possible to determine the progress of the sieve and to determine the sieving time of a measurement as a function of the material and sieve mesh size in a reproducible manner.
  • a dust measurement according to the triboelectric measuring principle is envisaged.
  • the measuring probe is installed downstream of the sieve bottom in the air jet sieve, for example in the exhaust air duct.
  • the raw signals on a triboelectric probe are very small, since only small amounts of charge are transferred and transported. Therefore, the charge amplifier must be coupled with particularly high impedance and have a high amplification factor. Such systems are prone to interference from interfering signals. Therefore, the probe and the amplifier should be connected with the shortest possible and interference-proof cables. It is ideal to completely dispense with cables for transporting the triboelectrically generated charges and to connect the probe and the amplifier directly.
  • the printed circuit board of the amplifier which is wholly or partially in a shielded housing screwed directly to the probe.
  • the triboelectric probe can be integrated at any point in the air jet screen in the flow direction downstream of the sieve bottom, namely wherever the particle air flow flows along a surface after sieving.
  • the probe can also be designed as a planar element on the bottom or the wall of the space below the sieve bottom.
  • the triboelectric sensor can be integrated into the slot nozzle.
  • This qualitative signal of the triboelectric probe is recorded time-dependent and can be correlated with the sieve progress. The course of the signal is used to determine the sieving time.
  • Sieving can be carried out so economically, since the screening time of each screening is adapted to the material and the screening conditions.
  • the use of the triboelectric measuring principle for the detection of particles in the exhaust air flow represents an economical measuring method.
  • the measuring probe is simple in construction, has a low construction volume and is insensitive to contamination and wear.
  • the invention is characterized by a method for operating the Lucasstrahisiebs, in which the particles are detected in the exhaust air flow and correlated with the Siebfortinho.
  • the detection of the particles in the exhaust air flow takes place according to the triboelectric principle.
  • the qualitative measurement signal of the triboelectric probe is recorded over time and the course of the signal is used to determine the screening time.
  • an air jet screen according to claims 1 to 5 is used.
  • FIG. 1 shows the air jet sieve with probe in the sectional view
  • the air jet screen 1 can be seen in a sectional view.
  • the housing 2 surrounds the drive motor 3 and the transmission 4 with drive shaft 5 for the slot nozzle 6.
  • the housing 2 forms together with the sieve plate 8 the Room 9 below the sieve tray 8 in which the slot nozzle 6 is arranged.
  • the sieve space 10 is limited by the sieve bottom 8 and the lid 11.
  • the lid 11 has a handle 12 for manually opening and closing the screen space 10.
  • the sieve 7 consists of an annular support structure 13, in which the sieve plate 8 is clamped.
  • the support structure 13 of the screen is loosely inserted into the housing 2 and is centered by a conical shoulder within the housing 2. Air is introduced into the slot nozzle 6 via the supply air duct 14 and blown from below against the sieve bottom 8.
  • the measuring probe 16 for the triboelectric dust measurement and a part of the device for differential pressure measurement between the intake and exhaust is arranged.
  • control panel 17 Also integrated in the housing is the control panel 17. It has a keypad, over which all required inputs can be made. Instead of the keyboard, a touch panel or a rotary knob can be used. A data interface to a computer can also be provided.
  • the built-in exhaust air duct 15 triboelectric probe 16 is connected to the amplifier with the shortest possible and fail-safe lines.
  • the invention is dispensed with cables for transporting the triboelectrically generated charges completely and the probe and the amplifier connected directly.
  • the printed circuit board of the amplifier which is wholly or partially in a shielded housing screwed directly to the probe.
  • the triboelectric sensor 16 can be integrated at any point in the flow direction after the sieve plate 8 in the air jet sieve, eg the exhaust duct 15 or in a connecting line to the downstream filter, namely everywhere where after the screening of the particle air flow flows along a surface.
  • the probe can also be formed as a planar element on the floor and / or the wall of the room below the sieve plate 8.
  • the triboelectric sensor can be integrated into the slot nozzle 6.
  • the required for the pressure measurement sensor is isolated in the exhaust duct 15 and also used as a tribo-electric probe.
  • the triboelectric measurement signal is recorded over time, the progress of the sieve is read from its course and the sieving time is determined.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Sampling And Sample Adjustment (AREA)
EP11002770.3A 2010-04-17 2011-04-02 Luftstrahlsieb Not-in-force EP2384823B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010015364A DE102010015364B4 (de) 2010-04-17 2010-04-17 Luftstrahlsieb

Publications (2)

Publication Number Publication Date
EP2384823A1 EP2384823A1 (de) 2011-11-09
EP2384823B1 true EP2384823B1 (de) 2015-12-02

Family

ID=44650625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11002770.3A Not-in-force EP2384823B1 (de) 2010-04-17 2011-04-02 Luftstrahlsieb

Country Status (5)

Country Link
US (1) US8678196B2 (ja)
EP (1) EP2384823B1 (ja)
JP (1) JP2011224561A (ja)
CN (1) CN102240639A (ja)
DE (1) DE102010015364B4 (ja)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20120060A1 (it) * 2012-01-20 2013-07-21 Longo Euroservice S R L Impianto mobile migliorato per l'aspirazione e il filtraggio di polveri e metodo per il pilotaggio dello stesso
US9101871B2 (en) * 2012-04-20 2015-08-11 International Business Machines Corporation Filter systems
JP6510563B2 (ja) 2014-02-20 2019-05-08 グレインフラック インコーポレイテッド 穀粒を分別するためのシステムおよび方法
DE102018108346A1 (de) 2018-04-09 2019-10-10 Umicore Ag & Co. Kg Beschichteter Wandflussfilter
DE102018111246A1 (de) 2018-05-09 2019-11-14 Umicore Ag & Co. Kg Verfahren zum Beschichten eines Wandflussfilters
DE102018127957A1 (de) 2018-11-08 2020-05-14 Umicore Ag & Co. Kg Partikelfilter mit mehreren Beschichtungen
DE102018127953A1 (de) 2018-11-08 2020-05-14 Umicore Ag & Co. Kg Wandflussfilter mit hoher Filtrationseffizienz
DE102018127955A1 (de) 2018-11-08 2020-05-14 Umicore Ag & Co. Kg Katalytisch aktiver Partikelfilter mit hoher Filtrationseffizienz
CN110860474B (zh) * 2019-11-25 2020-11-10 乐清泰起知识产权服务有限公司 一种计算机用精密电子器件制造设备
CN113203441B (zh) * 2021-06-08 2023-01-17 中国检验检疫科学研究院粤港澳大湾区研究院 一种用于食品内包装温湿度检测的检测器
CN116955961B (zh) * 2023-08-25 2024-02-09 江苏秦郡机械科技有限公司 一种智能化的滚笼筛清理效果评估方法及系统

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4261817A (en) * 1978-05-26 1981-04-14 Philip Edwards Sieving
JP2996963B1 (ja) * 1998-10-27 2000-01-11 川崎重工業株式会社 流動層乾燥・分級装置
US4970004A (en) * 1989-03-14 1990-11-13 Rosaen Borje O Vibrating sieve filter
DE4109452A1 (de) * 1991-03-22 1992-09-24 Klein Alb Gmbh Co Kg Verfahren und vorrichtung zum sichten von sand o. dgl. rieselgut
US5484061A (en) * 1992-08-04 1996-01-16 Advanced Electrostatic Technologies, Inc. Electrostatic sieving apparatus
DE4339834A1 (de) 1993-11-23 1995-05-24 Rheinische Werkzeug & Maschf Verfahren und Vorrichtung zur Korngrößenanalyse im Fein- und Feinstkornbereich
DE19830050A1 (de) * 1998-07-04 2000-01-13 Hosokawa Alpine Ag & Co Verfahren zum Betreiben eines Luftstrahlsiebs zur Korngrößenanalyse
DE19921409A1 (de) * 1999-05-08 2000-11-09 Hosokawa Alpine Ag & Co Luftstrahlsieb zur Korngrößenanalyse und zugehöriger Siebeinsatz
DE10022391C2 (de) 2000-05-02 2002-03-07 Foedisch Umweltmestechnik Gmbh Verfahren und Einrichtung zur extraktiven triboelektrischen Staubmessung in strömenden Gasen
DE10121620B4 (de) * 2000-05-02 2008-08-21 Dr. Födisch Umweltmeßtechnik GmbH Verfahren und Einrichtung zur extraktiven triboelektrischen Staub- und Aerosolmessung in strömenden Gasen
US20040174171A1 (en) * 2003-02-05 2004-09-09 Guido Desie Fast characterizing method for triboelectrical properties
DE10323089B4 (de) * 2003-05-16 2006-12-07 Glatt Process Technology Gmbh Wirbelschichtvorrichtung
CN101378847B (zh) * 2006-05-10 2012-06-27 株式会社知嘎萨 筛粉机
US8240481B2 (en) * 2006-05-10 2012-08-14 Tsukasa Co., Ltd. Sifter
JP2010054488A (ja) * 2008-08-27 2010-03-11 Seizaburo Akiyama 粉粒状体の篩網による粒度分布測定方法及び分級方法

Also Published As

Publication number Publication date
US8678196B2 (en) 2014-03-25
CN102240639A (zh) 2011-11-16
DE102010015364B4 (de) 2013-06-27
EP2384823A1 (de) 2011-11-09
DE102010015364A1 (de) 2011-10-20
US20110253601A1 (en) 2011-10-20
JP2011224561A (ja) 2011-11-10

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