EP0654308A1 - Procédé et dispositif pour l'analyse granulométrique dans les domaines fins et très fins - Google Patents

Procédé et dispositif pour l'analyse granulométrique dans les domaines fins et très fins Download PDF

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Publication number
EP0654308A1
EP0654308A1 EP94113026A EP94113026A EP0654308A1 EP 0654308 A1 EP0654308 A1 EP 0654308A1 EP 94113026 A EP94113026 A EP 94113026A EP 94113026 A EP94113026 A EP 94113026A EP 0654308 A1 EP0654308 A1 EP 0654308A1
Authority
EP
European Patent Office
Prior art keywords
sieve
gas
fine
gas flow
nozzle
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
Application number
EP94113026A
Other languages
German (de)
English (en)
Other versions
EP0654308B1 (fr
Inventor
Wolfram Dipl.-Ing. Blachetta
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.)
RHEWUM GmbH
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RHEWUM GmbH
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 RHEWUM GmbH filed Critical RHEWUM GmbH
Publication of EP0654308A1 publication Critical patent/EP0654308A1/fr
Application granted granted Critical
Publication of EP0654308B1 publication Critical patent/EP0654308B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/55—Cleaning with fluid jets
    • 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
    • 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 relates to a method for particle size analysis in the fine and ultra-fine grain range by means of a gas jet sieve, the material to be sieved being fed onto the sieve cloth, a gas jet being sucked through the sieve cloth and the sieve material by means of a slot nozzle rotating below the sieve cloth, fine portions being entrained by the gas flow and by the gas flow are transported in the opposite direction through the screen fabric to a discharge opening located below the screen fabric and a device for carrying out the method.
  • a so-called laboratory air jet sieve is known in the prior art, in which a sieve insert is held in a device housing. An air supply opening opens below the sieve insert.
  • a slot nozzle is coupled to this air supply opening, which is rotatably mounted in the screen housing and is motor-driven.
  • This slot nozzle runs below the sieve fabric of the sieve insert at a fixed speed, so that the sieve material placed on the sieve fabric is whirled up.
  • the air supplied is discharged via an outlet connection, the fine parts which are entrained by the air flow and transported through the screen fabric also being removed through the outlet connection.
  • the sieve insert is closed with a lid.
  • this device is equipped with a mechanical timer. The sieving time can be set here.
  • an indirect air volume setting is carried out on an external air throttle in the fan connection or by means of a separate speed controller on the vacuum-generating unit, which is connected to the air discharge nozzle of the device.
  • the object of the invention is to create a method and a device for carrying out the method, which enables exact and exact reproducible measured values.
  • the lack of setting accuracy is remedied by an exact supply air quantity detection and regulation of the volume flow of the supply air.
  • the amount of gas supplied can be recorded with a Venturi nozzle and a differential pressure measurement at this nozzle.
  • it is also any other type of flow measurement, e.g. Can be used with a Prandl tube, a hot wire or a measuring turbine.
  • the moisture and temperature of the gas supplied are also recorded (gas in each case is to be understood in particular as air).
  • the quantity supplied is continuously adapted to the setpoint by changing the fan speed.
  • the fan can be used in suction or in pressure mode, the fan being attached to the exhaust air opening in suction mode, while in pressure mode the fan is attached to the supply air opening.
  • the stepless variation of the nozzle speed and the change of the nozzle geometry and the direction of rotation aim in the same direction.
  • the speed of the nozzle is an important criterion for the exposure time and the exposure frequency of the material to be screened.
  • the nozzle can be exchanged for nozzles of different slot geometry or multi-arm nozzles for product adaptation.
  • a membrane compressor can be used to generate pressure and can be switched so that the ring line is depressurized when the compressor is switched off by means of a valve. The sieve insert can then be easily removed and reinserted without great effort.
  • the variation of the screen space height and the shape of the screen space by changing the screen space cover (cover) also serves to vary the product load.
  • the lids used are preferably flat. However, they can also be concavely or convexly curved and / or provided with a structured surface for targeted flow influencing and control.
  • the screen space is sealed with a foam rubber cord or a flat gasket.
  • the humidity and temperature of the medium causing the screening is also recorded and regulated.
  • the control can be carried out using upstream heating elements, dryers or humidifiers. These components are included in the air volume determination through the temperature and humidity measurement and the display values are corrected. In addition, they are integrated into the process control in order to achieve targeted conditioning of the material to be screened. So for In the case of hygroscopic products with preheated air, the relative humidity is reduced and the sieving capacity is maintained. In the case of electrostatic charging, the charge on the material to be screened can be reduced by increasing the air humidity.
  • the measuring time is preset to the second and adhered to exactly. This is particularly important in the case of products sensitive to dispersion, which, for example, must not be exposed to high mechanical stress. In this case, an imprecise timing affects the sieving result considerably, since some products only tolerate sieving times of one minute.
  • the exhaust air flow is monitored optically and the particle flow is measured. If a certain termination criterion is fulfilled, e.g. the criterion of 0.1% per minute specified in DIN is ended after an adjustable follow-up time.
  • a certain termination criterion e.g. the criterion of 0.1% per minute specified in DIN is ended after an adjustable follow-up time. The measurement without a specified time and thus the automatability of measurement series is particularly advantageous.
  • an electronic microcontroller In order to process the wealth of information and to be able to reproducibly perform the various functions, the entire control of the device is carried out by an electronic microcontroller. This includes the necessary hardware and software. The setting and measured values are displayed digitally and can be read on an illuminated LC display. The microcontroller also realizes one RS-232 interface, via which a log printout as well as PC input and output is possible. By means of this interface and the technical design of the laboratory sieve machine shown, the system is the basis and component of an automatic analyzer with computer control of the analysis process, in which only the changing of the sieve inserts and the weighing have to be automated.
  • the analytical sieve device consists of a sieve machine housing 1, in which a slot nozzle 2 is rotatably held and can be driven via a drive motor 5.
  • a sieve insert 3 which is closed by a sieve space cover 4, is detachably arranged above the slot nozzle 2 is.
  • a venturi nozzle 6 connects to an air inlet pipe 7, from which the supply air is guided to the slot nozzle 2. With 8 a suction pipe is designated, through which the supplied air is sucked off. 9 with an annular hose seal is referred to, which can be inflated for the purpose of sealing by means of a compressor and can be vented for the purpose of exchanging the sieve insert 3.
  • a moisture sensor 10 and temperature sensor 11 with a signal detection board 12 are also integrated into the inlet pipe 7, as shown in FIG.
  • the material to be sieved is first filled into the sieve insert after the lid 4 has been removed, and the lid is placed tightly again. Subsequently, compressed air is supplied through the inlet connection 7 or suction air is sucked into the device through a suction member connected to the suction connection 8. The amount of air flowing in at 7 is detected in the area of the Venturi nozzle 6 by measuring the differential pressure at this nozzle. Furthermore, the relative humidity and the temperature of the supply air are measured by the humidity sensor 10 and the temperature sensor 11. If these measured values do not agree with the target value (specified), the flow velocity of the air supplied is reduced or increased, the humidity of the air is increased or decreased and the temperature is also increased or decreased until the target value is reached.
  • the supplied air then flows through the slot nozzle 2 and from there through the sieve fabric of the sieve insert 3.
  • the sieve material deposited on the sieve fabric is also flowed through, fine particles being entrained by the air flow, sucked down through the sieve fabric in the opposite direction and conveyed out of the suction nozzle 8.
  • FIG. 4 shows the linking of the input values, measured values and control values by means of a micro controller.
  • the differential pressure, the air temperature, the relative humidity and the nozzle speed are recorded as measured values.
  • the sieving time, the volume flow, the air temperature, the nozzle speed and the nozzle rotation direction are entered as input values.
  • the suction speed, the nozzle motor voltage (the drive motor of the nozzle), the heating voltage of the heating device, the compressor voltage for inflating the ring hose seal and the running time are output by the microcontroller as control values.
  • the invention is not based on the embodiment limited, but often variable within the scope of the disclosure.
EP94113026A 1993-11-23 1994-08-20 Procédé et dispositif pour l'analyse granulométrique dans les domaines fins et très fins Expired - Lifetime EP0654308B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4339834A DE4339834A1 (de) 1993-11-23 1993-11-23 Verfahren und Vorrichtung zur Korngrößenanalyse im Fein- und Feinstkornbereich
DE4339834 1993-11-23

Publications (2)

Publication Number Publication Date
EP0654308A1 true EP0654308A1 (fr) 1995-05-24
EP0654308B1 EP0654308B1 (fr) 1997-09-24

Family

ID=6503193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94113026A Expired - Lifetime EP0654308B1 (fr) 1993-11-23 1994-08-20 Procédé et dispositif pour l'analyse granulométrique dans les domaines fins et très fins

Country Status (4)

Country Link
EP (1) EP0654308B1 (fr)
JP (1) JP2787656B2 (fr)
AT (1) ATE158519T1 (fr)
DE (2) DE4339834A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2384823A1 (fr) * 2010-04-17 2011-11-09 HOSOKAWA ALPINE Aktiengesellschaft Tamiseur à courant d'air

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19830050A1 (de) * 1998-07-04 2000-01-13 Hosokawa Alpine Ag & Co Verfahren zum Betreiben eines Luftstrahlsiebs zur Korngrößenanalyse
CN105963896B (zh) * 2016-06-28 2021-06-15 广威消防科技有限公司 消防喷头试水合格率筛选装置
CN109201174B (zh) * 2018-09-16 2020-11-20 义乌市添诚科技有限公司 一种煤炭粉碎的检测方法、调节方法以及煤炭粉碎机
CN109201175B (zh) * 2018-09-16 2020-11-24 义乌市添诚科技有限公司 煤炭粉碎机
KR20210016716A (ko) 2019-08-05 2021-02-17 삼성전자주식회사 미세먼지 측정 장치 및 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2414686A1 (de) * 1974-03-27 1975-10-16 Allgaier Werke Gmbh Verfahren und vorrichtung zum sieben
GB2021442A (en) * 1978-05-26 1979-12-05 Pozzolanic Ltd Sieving
EP0198945A2 (fr) * 1985-04-18 1986-10-29 Salzgitter Maschinenbau Gmbh Installation de classification et triage pour séparer des particules indésirables de matériaux en vrac
EP0212495A2 (fr) * 1985-08-15 1987-03-04 Norton Company Procédé et dispositif de tamisage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2414686A1 (de) * 1974-03-27 1975-10-16 Allgaier Werke Gmbh Verfahren und vorrichtung zum sieben
GB2021442A (en) * 1978-05-26 1979-12-05 Pozzolanic Ltd Sieving
EP0198945A2 (fr) * 1985-04-18 1986-10-29 Salzgitter Maschinenbau Gmbh Installation de classification et triage pour séparer des particules indésirables de matériaux en vrac
EP0212495A2 (fr) * 1985-08-15 1987-03-04 Norton Company Procédé et dispositif de tamisage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G.F. KUDRYAVTSEV:: "Air-jet sifter for determining the granulometric composition of powders", MEASUREMENT TECHNIQUES, vol. 21, no. 5, 1978, NEW YORK US, pages 715 - 717 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2384823A1 (fr) * 2010-04-17 2011-11-09 HOSOKAWA ALPINE Aktiengesellschaft Tamiseur à courant d'air
CN102240639A (zh) * 2010-04-17 2011-11-16 霍索卡瓦阿尔彼股份公司 气分筛

Also Published As

Publication number Publication date
JPH07198581A (ja) 1995-08-01
DE4339834A1 (de) 1995-05-24
DE59404158D1 (de) 1997-10-30
EP0654308B1 (fr) 1997-09-24
JP2787656B2 (ja) 1998-08-20
ATE158519T1 (de) 1997-10-15

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