EP0593955A2 - Dispositif et procédé pour nettoyer un mélange de grains, principalement sous forme de granules - Google Patents

Dispositif et procédé pour nettoyer un mélange de grains, principalement sous forme de granules Download PDF

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Publication number
EP0593955A2
EP0593955A2 EP93115763A EP93115763A EP0593955A2 EP 0593955 A2 EP0593955 A2 EP 0593955A2 EP 93115763 A EP93115763 A EP 93115763A EP 93115763 A EP93115763 A EP 93115763A EP 0593955 A2 EP0593955 A2 EP 0593955A2
Authority
EP
European Patent Office
Prior art keywords
particles
inlet
spreading
housing
cleaning gas
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
EP93115763A
Other languages
German (de)
English (en)
Other versions
EP0593955A3 (fr
EP0593955B1 (fr
Inventor
Hans Heckel
Dieter Dipl.-Ing. Müller
Uwe Dipl.-Ing. Schwanke
Volhard Dipl.-Ing. Sorgatz
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.)
Waeschle Maschinenfabrik GmbH
Original Assignee
Buehler 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
Priority claimed from DE19924235260 external-priority patent/DE4235260A1/de
Priority claimed from DE19934302857 external-priority patent/DE4302857A1/de
Application filed by Buehler GmbH filed Critical Buehler GmbH
Publication of EP0593955A2 publication Critical patent/EP0593955A2/fr
Publication of EP0593955A3 publication Critical patent/EP0593955A3/fr
Application granted granted Critical
Publication of EP0593955B1 publication Critical patent/EP0593955B1/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
    • B07B11/06—Feeding or discharging 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
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements

Definitions

  • the invention relates to a device for cleaning a grain mixture, which is essentially in granular form and contains particles of different sizes, from precisely these particles according to the preamble of claim 1 and to a method for cleaning this grain mixture according to the preamble of claim 7.
  • Such classifiers are intended to separate fine fractions from coarse fractions; however, separation of fine and substantially larger particles at the same time in order to obtain cleaned granules is not possible with this.
  • the separation into several grain size fractions is possible with the help of multi-component sifters and this with great selectivity, but this is associated with considerable structural effort.
  • the invention is based on the object of providing an apparatus and a method whereby, in the course of the same visual process, both fine fractions and coarse fractions can be separated from an essentially granular mixture, so that the granulate is then free of these fractions. This is achieved by realizing the characterizing features of claim 1 and claim 7.
  • the already pre-cleaned batch loaded with particles of smaller size then hits the spreading plate in the flow of gravity, which is preferably provided with a hood which is in particular cone-shaped with a recess for the mixture flowing on the spreading plate.
  • a hood has the effect that batches which rebound from the spreader plate cannot emerge again against the direction of the fall.
  • a gap is provided on the respective peripheral edge between the hood and the granulate, the size of which depends on the typical granule diameter of the grain mixture to be cleaned.
  • a gap height of 8 to 15 mm is advantageous for polyester or polyamide granules.
  • the spreader plate itself is designed accordingly, and preferably in the form of a cone sitting on a truncated cone with a larger angle of inclination to the horizontal than the angle of inclination of the truncated cone, so that ricocheting grain remains within the area delimited by the hood and only from the gap between the spreader plate and Hood can escape.
  • Such an effect could also be achieved by designing the spreading disc in the form of a cone alone, but it is preferable to design it in the form of the cone seated on the truncated cone, since the problem area that is provided by the recess in the hood can be better controlled.
  • the edge region of the scatter plate is preferably of a horizontal and ring-shaped design.
  • the batch loaded with the smaller particles also contains these bound to the granules, it is advantageous to fling the batch emerging from the spreading plate as a homogeneous scatter curtain against an impact device which radially surrounds the spreading plate, particles adhering to the granulate being knocked off.
  • the inlet opening for the cleaning gas which is in particular in the form of an annular channel and thus enables a uniform flow over the circumference of the device, is provided just below the impact device, a measure which is particularly advantageous in terms of construction.
  • a central inlet channel for the cleaning gas, which supplies the gas from below, is also possible, but would increase the overall height for such a cleaning device.
  • a funnel is provided above the spreading plate, which may have a wall that is raised on one side, so that the incoming batch is safely contained.
  • This funnel can be attached on one side to the inner wall of the housing, this not only being done for purely fastening purposes, but at the same time offering the possibility that the cleaning gas flowing upwards may be divided into at least two partial streams, which gives the possibility of both turbulent and approximate laminar (hereinafter referred to as "smoothed") flow behavior.
  • Baffles which are provided on the inner wall of the housing, serve to calm the upward flowing cleaning gas in the zone above the spreading disc and below the retaining device.
  • baffles are only arranged on one side, only a partial flow of the cleaning gas can be smoothed. This partial flow can then, if necessary, be directed such that it flows through the retaining device and takes larger particles retained thereon on account of the relatively high flow resistance of these particles compared to the granules. Of the Particles of larger expansion pushed back are also carried along by the calmed flow, while the granulate-grain mixture is essentially not hindered in its case.
  • the area above the spreading plate is designed in such a way that the flow rate of the cleaning gas flowing upward is reduced.
  • the cross-section through which the cleaning gas flows increases in this area.
  • the retaining device preferably consists of mutually parallel, vertically standing walls, so that the larger particles, which are present, for example, as angel hair or bird nests, remain attached to their upper edges, while the grain mixture containing the particles of smaller size can fall through between these walls.
  • This retaining device which is also referred to as a thread comb, preferably has obliquely aligned upper edges with respect to the solder, so that retained particles resting on the upper edges can slip into the flow of the cleaning gas and be carried along by it.
  • the guide device for the batch running into the housing of the device which is intended to prevent the retention device from jumping over through the granulate, can be designed in the form of pivotable flaps which extend with their free side to the top of the retention device, so that larger particles retained can slip under these flaps as a result of further retained particles.
  • the guide device can comprise a metering element which can be actuated as a function of the quantity of the product entering the housing, for example, from a storage vessel and which is arranged on the storage vessel.
  • guide vanes are preferably arranged in the inlet opening for the gas, which is designed in particular as an annular channel. These guide vanes should preferably be adjustable, in particular as a function of the speed of the spreading disc, so that different product or process-specific conditions can be met.
  • the granulate cleaner has a housing 5 with an inlet 11 for the grain mixture 1, which contains coarse and fine impurities. At the lower end of the housing 5 there is an outlet 12 for the granules 18 cleaned of the impurities. Cleaning gas enters the housing 5 through an inlet opening 13, flows upwards, against which gravity flows through the housing 5 moving batch 1, and leaves the housing through the outlet opening 7.
  • the grain batch 1 loaded with impurities in the form of coarse and fine particles enters the housing 5, optionally from a feed vessel 20, and passes through a retaining device 2, which consists of several to one another parallel, vertical walls on a chute 2 '.
  • the distance between the walls depends on the size of the granulate; for a granule cleaner intended for polyester or polyamide granules, it is approx. 15 mm.
  • Such a restraint device is also referred to as a thread comb. Larger particles 3, which are obtained in the form of "angel hair” or "bird nests", will get caught on the upper edges of the thread comb 2, whereas the granulate 4 loaded with fine particles in dust form can fall through it between the walls.
  • Flaps 15 are rotatably articulated on the inner wall of the inlet region of the housing 5 and rest with their free sides on the upper edges of the thread comb 2. This prevents incoming granulate from jumping over impurities 3 lying on the upper edges of the thread comb 2, it must run through the thread comb 2.
  • the coarse impurities 3 are gradually pushed under the rotatable flaps 15 as a result of subsequent impurities, detected by the cleaning gas, which carries the fine impurities with it, due to the large flow resistance compared to that of the granules, carried away by the gas and discharged.
  • the granules 4 loaded with the fine particles fall through the thread comb 2 onto the spreading plate 6, specifically through a recess 17 in a cover 16 seated on the spreading plate 6.
  • Spreading plate 6 and cover 16 are spaced apart from one another via narrow connecting pieces (not shown) , so that a gap 8 of about 10 mm remains free, can escape between the granules.
  • this gap width is not critical.
  • the spreading disc is set in rotation by a motor 21, on the shaft of which it is placed directly, as is that connected to it Covering hood 16.
  • the circumferential speed of this spreading plate is expediently approximately 6 to 16 m / s, preferably 8 to 14 m / s, based on the average diameter of the spreading gap 8 can jump back, spreading plate 6 and cover 16 have approximately the shape of a double cone, so that the granules are always reflected towards the gap 8.
  • the spreading plate 6 is preferably designed in the form of a truncated cone 6b, which is seated on a horizontal ring 6c and carries a cone 6a. The angle of inclination of the cone 6a against the horizontal is greater than that of the truncated cone 6b.
  • the granules are thrown in the form of a homogeneous diffusing curtain 9 against a baffle ring 10, adhering, dust-like impurities are knocked off and the granules are reflected against the outlet opening 12.
  • the impact ring 10 has the shape of a truncated cone jacket; this and the corresponding choice of the rotational speed of the spreading plate 6 has the effect that the granules are not destroyed, as would be the case, for example, with loading plates equipped with impact elements (for example in accordance with an embodiment as described in EP-B1-237 641 and the serves to break up agglomerates).
  • the cleaning gas enters the housing through the annular channel-shaped inlet opening 13 just below the baffle ring 10, flows through the granulate reflected by the baffle ring 10 and the diffusing curtain 9, taking away the knocked-off fines, residues of fines and other dust-like impurities that are still entrained.
  • the cleaning gas then flows up in the area between the cover 16 and the inner wall of the housing, the cross section of this area increasing upwards and the flow rate decreasing. As a result of the rotation of the spreading plate 6 and the cover 16, the cleaning gas is also given a swirl.
  • FIG. 2 shows an alternative to FIG. 1, in which both the guidance of the grain mixture and the gas flow are optimized.
  • 2 shows a central longitudinal section of the granule cleaner, while the left part of FIG. 2 illustrates a view of the granule cleaner after the outer wall of the housing has been removed.
  • the contaminated grain mixture 1 is introduced into the housing 5 from a feed container 20.
  • the feed container 20 is rotatably mounted about an axis 23. With increasing filling of the feed container 20, a slide 19a mounted at point 26 is opened ever further via a cutting edge 25. This ensures that the thread comb 2 is always fed from a bed, granules jumping over the thread comb is avoided.
  • the dust-laden granulate runs through the thread comb 2, and a collecting funnel 29 which is attached to the inner wall of the housing 5 and is somewhat raised on one side causes the granulate to reach the spreading plate 6 safely through the recess 17 in the cover 16.
  • the scatter curtain 9 thrown off by the scatter plate 6 hits the impact ring 10, dust adhering to the granules is knocked off and entrained by the cleaning gas.
  • the cleaning gas enters the housing 5 through the ring channel 13, wherein it is given a swirl opposite to the direction of rotation of the spreading plate 6 by guide vanes 28.
  • the gas flows, as described above, against the outlet opening 12 reflected granules and the scatter curtain, knocked off and entrained dust still entrained by the granules. Since the collecting funnel 29 is fastened on its elevated side to the inner wall of the housing 5, the gas flow there, after flowing along the top of the cover 16, to both sides of the Flow up funnel 29.
  • the thread comb 2 protruding into the housing 5 is flowed through from below by a gas stream smoothed by guide plates 22, which takes the larger particles, such as angel hair and bird nests, with it.
  • the collecting funnel 29 is connected to the inner wall of the housing, there is the possibility of directing the gas streams flowing up on its sides in such a way that they no longer pass through the thread comb 2, and only the partial flow which is on the free side of the collecting funnel 29 the guide plates 22 soothes, flows up, flows through the thread comb 2. It has proven to be advantageous to pass only a partial flow of the cleaning gas through the thread comb 2, so that only the coarse impurities are deliberately entrained. It is conceivable to make the size of this gas flow adjustable by pivoting baffles on the inside wall of the housing and / or on the outside of the collecting funnel 29 and / or on the cover 16, depending on the degree of contamination of the batch or on the size of the granules or the flow velocity of the Cleaning gas.
  • the guide vanes 28 should preferably be designed to be adjustable so that, depending on the rotation speed of the spreading plate 6 - and possibly the flow speed of the gas - the gas can be given such a swirl that the differential speed between the gas and the granulate is optimized.
  • FIG. 3 shows an embodiment of the granule cleaner corresponding to FIG.
  • the batch 1 flowing out of the feed container 20a which is arranged here in a fixed manner, is passed through the metering member designed as a pendulum flap 19b.
  • the thread comb 2 is always fed from a bed.
  • the thread comb 2 described is independent per se of which it is advantageous what the cleaning device underneath looks like.
  • the necessary inclination of the pouring channel carrying the walls 2 may not always be advantageous for the delivery of the centrifugal or spreading plate 6, because the falling granulate 4 may be more or less away from the center and the axis of rotation thereon can hit and thus the granulate experiences 4 different accelerations.
  • the air can now flow either in parallel, on the one hand, into the space surrounding the spreading plate 6 and, on the other hand, into the chamber 105, which is closed off in the manner mentioned and has the thread comb. However, it preferably flows through both rooms in succession in the manner shown in FIG. 4.
  • a transfer pipe 32 is provided which receives the air flowing in via the air paths 13 and 9, which is laden with dust at 10, and feeds it to the chamber 105, preferably in the region of the pouring channel 2 '.
  • the pouring channel 2 ' may optionally be fork-shaped at its free end, so that the prongs of this fork are formed by the vertical walls 2 and the intermediate floor withdraws somewhat, so that air flows through from below between the vertical walls 2 and any threads can tear up freely from the top of the walls 2, whereupon the air thus loaded (or an inert gas) flows out again at 7.
  • FIG. 5 shows a restraint device 102 which is also suitable for pre-separation of granular fine constituents and can therefore be used more universally is.
  • a feed funnel 205 with a vertical axis, which is arranged concentrically to the axis of rotation of the spreading plate 6, is advantageously provided, which is held stationary in the casing 10 'with a tripod support 41.
  • the guide cone 102 ', together with an air guide ring 102'' forms a pneumatic restraint device 102.
  • the air guide ring 102 ′′ adjoins the feed funnel 205 with a lower, here funnel-shaped, surface 34 with an optionally adjustable gap 35, in order to thus forward a partial flow 36 penetrating via the gap 35 to effect the inlet 13 air supplied.
  • a lower, here funnel-shaped, surface 34 with an optionally adjustable gap 35, in order to thus forward a partial flow 36 penetrating via the gap 35 to effect the inlet 13 air supplied.
  • other constructions such as optionally adjustable nozzles or the like distributed over the circumference of the surface 34, can also be used to supply this partial stream 36 flowing through the retaining device 102. be provided.
  • the cross-sectional ratio of the slots 35, 35 ' now ensures a relatively uniform and flow-stable branching of the air stream 36 from the residual air stream 36'. It is further understood that the lower surface 34 does not necessarily have to be funnel-shaped, but can also be cylindrical or conical if necessary.
  • the guide cone 102 ' is also provided with a counter-cone 37 downwards, an air distribution channel between these two surfaces, which promotes even distribution, is advantageously formed together with the surface 34, the one from the slot 35 into the relatively wide feed funnel 205 air which has penetrated is first accelerated again and distributed evenly over the circumference before it reaches the upper surface 38, preferably running approximately parallel to the guide cone 102 ', and is deflected by it over the surface of the guide cone 102' in such a way that it over the surface of the guide cone 102 '.
  • the guide cone 102 ' has a function here that has no role model in the prior art. Because on the one hand it is imperative that the flow of material trickling down from the radial inside through the valve 33, 33 'due to the radially outward enlarging cone surface becomes increasingly thinner until only a material veil formed by individual grains remains on the edge.
  • the guide cone 102 ' together with the surface 38, delimits an expediently adjustable gap 39 which can be designed or adjusted in such a way that larger balls of threadlike material are stopped.
  • the partial stream 36 blows over the edge region of the guide cone, where the material veil is diluted and therefore releases any threads, so that such threads 3 can be easily taken along.
  • valve body 33 is adjustable or self-adjusting relative to its seat 33 'in a manner as has become known from DE-C-29 29 672, the content of which is to be regarded as disclosed here by reference, so that a detailed description of the associated adjustment mechanism is provided 42 can be omitted.
  • the height of the guide cone 102 ' is fixedly adjustable with the aid of an adjusting device 49 for the purpose of adjusting the gap 39 relative to the air guide ring 102' '.
  • a change in the flow cross-section of the gaps 35 and 35 ' is possible from the outside by raising or lowering the unit consisting of the cone 102' and the guide ring 112 ''.
  • a holding rod 44 is provided which carries at its upper end a screw nut 46 which is supported on a fixed stop 45.
  • one of the support rods here the rod 47 of the adjusting device 42 for the valve 33, 33 ', is advantageously hollow and comprises the other rod 44 in each case.
  • a further guide for the guide cone 102 ' is provided on its underside, where a plurality, advantageously three, guide rods 48 protrude vertically downward and are guided in guide bushes 50 of the stationary funnel 205.
  • a uniform slot width and thus a uniform air distribution over the entire circumference of the guide cone 102 'and an adjustable division of the air flow into partial flows 36, 36' are ensured.
  • the motor 21 or a transmission arranged between it and the spreading plate 6 are dimensioned such that an average particle speed of 6 to 16 m / s, preferably 8 to 14 m / s, results in the edge region of the spreading plate 6, and in particular in the central region m of the slot 8.
  • the restraint device 2 or 102 can also be implemented without a turntable with the same advantages.

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  • Detergent Compositions (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP93115763A 1992-10-20 1993-09-30 Dispositif et procédé pour nettoyer un mélange de grains, principalement sous forme de granules Expired - Lifetime EP0593955B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19924235260 DE4235260A1 (de) 1992-10-20 1992-10-20 Vorrichtung zum Reinigen eines im wesentlichen in Granulatform vorliegenden Korngemenges und Verfahren zum Reinigen dieses Korngemenges
DE4235260 1992-10-20
DE4302857 1993-02-02
DE19934302857 DE4302857A1 (de) 1993-02-02 1993-02-02 Vorrichtung zum Reinigen eines im wesentlichen in Granulatform vorliegenden Korngemenges und Verfahren zum Reinigen dieses Korngemenges

Publications (3)

Publication Number Publication Date
EP0593955A2 true EP0593955A2 (fr) 1994-04-27
EP0593955A3 EP0593955A3 (fr) 1995-04-05
EP0593955B1 EP0593955B1 (fr) 1999-01-13

Family

ID=25919620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115763A Expired - Lifetime EP0593955B1 (fr) 1992-10-20 1993-09-30 Dispositif et procédé pour nettoyer un mélange de grains, principalement sous forme de granules

Country Status (5)

Country Link
US (1) US5458245A (fr)
EP (1) EP0593955B1 (fr)
AT (1) ATE175594T1 (fr)
DE (1) DE59309296D1 (fr)
ES (1) ES2128377T3 (fr)

Cited By (1)

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WO2015036384A3 (fr) * 2013-09-11 2015-06-11 BüHLER GMBH Dispositif de détermination d'une quantité de matière en vrac, dispositif d'admission de matière en vrac, machine de nettoyage de matière en vrac et procédé correspondant

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US5938045A (en) * 1996-01-12 1999-08-17 Ricoh Company, Ltd. Classifying device
DE19756099A1 (de) 1997-12-17 1999-07-01 Waeschle Gmbh Verfahren zum Sichten von Schüttgut
DE19957993B4 (de) * 1999-12-02 2004-07-22 Bückmann GmbH Kegelsichter und Verfahren zum Sichten von eingeschränkt oder nicht rieselfähigem Schüttgut und Halterungsstrebe
DE10030705A1 (de) * 2000-06-23 2002-01-03 Hosokawa Micron Gmbh Zyklonsichter mit zentralen Einbau
US8118173B2 (en) * 2008-12-03 2012-02-21 Westlake Longview Corp. Streamer trap assembly
RU2458750C1 (ru) * 2011-03-04 2012-08-20 Федеральное государственное образовательное учреждение высшего профессионального образования "Воронежский государственный аграрный университет имени К.Д. Глинки" (ФГОУ ВПО ВГАУ им. К.Д. Глинки) Приемно-распределительное устройство зерноочистительной машины
RU2465073C1 (ru) * 2011-05-04 2012-10-27 Федеральное государственное образовательное учреждение высшего профессионального образования "Вятская государственная сельскохозяйственная академия" (ФГОУ ВПО Вятская ГСХА) Пневматический сепаратор
DE102015101779A1 (de) * 2014-02-25 2015-08-27 Pelletron Corp. Entstaubungsapparat mit aktuaktorkontrollierten Einlassableitblechen zur Produktflussregulierung
US9968971B1 (en) * 2014-07-11 2018-05-15 Plastic Revolutions, Inc. Friction washer that cleans plastic for recycling
CN105537115A (zh) * 2015-12-07 2016-05-04 重庆华世丹机械制造有限公司 一种清选机构及其收割机
DE102016106588B4 (de) * 2016-04-11 2023-12-14 Neuman & Esser Process Technology Gmbh Sichter
CN110465488B (zh) * 2019-08-05 2021-03-02 界首市金龙机械设备有限公司 一种粮食平抛式除尘装置
RU2758280C1 (ru) * 2020-12-03 2021-10-28 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Воздушный классификатор сыпучих материалов

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US2866547A (en) * 1956-09-11 1958-12-30 Pangborn Corp Abrasive separator
US3312343A (en) * 1964-05-07 1967-04-04 Hesston Corp Air separator
DE3425101A1 (de) * 1984-07-07 1986-01-16 Heinz 4630 Bochum Jäger Verfahren und sichter zur trennscharfen sichtung eines gutstromes, insbesondere von zement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015036384A3 (fr) * 2013-09-11 2015-06-11 BüHLER GMBH Dispositif de détermination d'une quantité de matière en vrac, dispositif d'admission de matière en vrac, machine de nettoyage de matière en vrac et procédé correspondant
RU2638111C2 (ru) * 2013-09-11 2017-12-11 Бюлер Гмбх Устройство для определения количества сыпучего материала, устройство для загрузки сыпучего материала, машина для очистки сыпучего материала и соответствующий способ

Also Published As

Publication number Publication date
ATE175594T1 (de) 1999-01-15
ES2128377T3 (es) 1999-05-16
US5458245A (en) 1995-10-17
EP0593955A3 (fr) 1995-04-05
EP0593955B1 (fr) 1999-01-13
DE59309296D1 (de) 1999-02-25

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