EP0247237A2 - Verfahren und Vorrichtung zum Sortieren und Trockenreinigen von Weizen - Google Patents

Verfahren und Vorrichtung zum Sortieren und Trockenreinigen von Weizen Download PDF

Info

Publication number
EP0247237A2
EP0247237A2 EP86117028A EP86117028A EP0247237A2 EP 0247237 A2 EP0247237 A2 EP 0247237A2 EP 86117028 A EP86117028 A EP 86117028A EP 86117028 A EP86117028 A EP 86117028A EP 0247237 A2 EP0247237 A2 EP 0247237A2
Authority
EP
European Patent Office
Prior art keywords
wheat
vibrating screen
size
vibrating
air stream
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.)
Withdrawn
Application number
EP86117028A
Other languages
English (en)
French (fr)
Other versions
EP0247237A3 (de
Inventor
Claudio Frittoli
Luigi Bonoldi
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.)
Ocrim SpA
Original Assignee
Ocrim SpA
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 Ocrim SpA filed Critical Ocrim SpA
Publication of EP0247237A2 publication Critical patent/EP0247237A2/de
Publication of EP0247237A3 publication Critical patent/EP0247237A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents

Definitions

  • This invention relates to a method and a device for sorting and dry cleaning wheat for use, in particular, following preliminary processing through a grading machine for size.
  • Wheat that has been subjected to such a pre-treatment for grading contains, however, some amounts of dust and lightweight particles which require to be separated.
  • the wheat thus treated must then be graded according to weight into a light fraction and a heavy fraction.
  • This grading treatment for weight is generally conducted in a concentrator which separates a light fraction (amounting to about 30% by weight) and a heavy fraction (amounting to about 70% by weight).
  • the light fraction must then be further processed for removal of rye, barley, light wheat, whilst the heavy fraction shall have to be processed, in turn, on a stone trap for stone removal.
  • the cited concentrator has a considerable height dimension and spans the full height of a story of the building accommodating the cleaning equipment, thus involving a much higher first cost than the cost of the concentrator per se.
  • Another object is to reduce the overall size of the wheat cleaning apparatus as a whole, attenuating the necessity of a full story of the building which contains such apparatus.
  • the heavy phase amounts to about 50-70% by weight and requires, after going through the vibrating screen in step (c), no further processing through a dust trap, thereby said heavy phase may be transferred directly to the stone trap.
  • step (a) Only the light phase, which only amounts to about 30-50% by weight of the total, is subjected to the dust freeing process of step (a), thus affording savings in power which can be as high as 70%.
  • the wheat is kept in vibratory motion along a substantially horizontal path.
  • the wheat is held preferably on a slightly inclined path to the horizontal direction.
  • the method described above is implemented of preference on a device including a loading well, a first vibrating screen having smaller size holes than the wheat size, a second vibrating screen having larger size holes than the wheat size, and being characterised in that it comprises a discharge well located at the end of said second vibrating screen having a laminar outlet for the wheat to flow out; a suction channel located at said laminar outlet; said laminar outlet being formed by the bottom of said discharge well and a wall of said suction channel.
  • the support for the bottom of the loading - well, the first vibrating screen, second vibrating screen, and support for the bottom of the discharge well form a rigid unitary vibrating body.
  • a single vibration generating unit connected rigidly to said rigid body it becomes possible to keep all the active parts of the device in a vibratory state.
  • Said vibration-generating unit is preferably comprised of a pair of eccentric mass powered vibrators so arranged as to impart a force directed horizontally through the centre of gravity of the rigid vobrating body.
  • a grader for size is provided which yields a stream 2 of small size particles, stream 3 of medium size particles consisting of wheat, and stream 4 of large size particles mostly comprising maize incidentally admixed to the wheat and large size impurities.
  • the stream 3 contains about 98% of the wheat and represents, accordingly, the useful yield.
  • the stream 3 is directed to a dust trap 46 which operates on a vertical suction channel and an ascending stream of air, to be accomplished, for example, as disclosed in the above-mentioned Italian patent No.777734.
  • the stream of dust-free wheat is then processed through the concentrator 5, which delivers a light fraction 6 amounting to about 30% by weight, and a heavy fraction 7 amounting to about 70% by weight.
  • the light fraction 6 is then processed on a rubbing device 8 which exerts a powerful cleaning action in combination with one of crushing the empty grains and earth lumps.
  • a successive dust trap 47 will improve the cleaning of said fraction.
  • the heavy fraction 7 is processed through the stone trap 10, which separates stones from the useful grain 11.
  • a grader for size 12 is arranged to feed the loading well 13 of the device 14 of this invention, which yields the light fraction 6 and heavy fraction 7 which are processed through the devices 8 and 47 and the stone trap 10.
  • the useful wheat is collected from the streams 9 and 11.
  • a loading well 13 is provided to collect the wheat infeed to be treated.
  • the bottom 15 of the loading well 13 is carried on a support 16 which is connected rigidly to the rigid body 17 which is kept in vibratory motion by a pair of powered vibrators 18 of the counter-rotating eccentric mass type.
  • the bottom 15 of the loading well 13 is made to yield to the weight of the wheat load and is adjustable by means of a spring 20.
  • the rigid body 17 bears on elastic means 19 which allow for its vibration.
  • the rigid body 17 carries directly the first screen 21 and second screen 22 which have smaller and larger holes, respectively, than the wheat grain size.
  • both screens would slope slightly toward the discharge end from the horizontal direction.
  • the terminating portion of the second screen communicates directly with the discharge well 26, which has a laminar opening 27 formed by the bottom 28 of the discharge well and the wall 29 of the suction channel 30.
  • the area of the laminar opening can be adjusted by shifting, upwards or downwards, the flat moulding 44.
  • the support 42 for the bottom 28 of the discharge well 26 supports the bottom 28 rigidly.
  • the wall 29 is hinge mounted at 31 close to the top of the supporting structure, thereby its position can be controlled by operating a handwheel 32 which drives a'lever not shown in the drawing.
  • Adjustability of the wall 29 position affords, for a given ascending air flow, control of the suction force of the channel 30.
  • Valves 33,34 afford, moreover, additional adjustment of the airflow through the sieves 21,22 and the channel 30, respectively.
  • a hood 43 enables connection of the device to a suction fan which will generate the required vacuum to.provide the streams through the screens 21,22 and the channel 30.
  • Two chutes 35,36 allow the heavy fraction to be conveyed to a hopper 37.
  • a hopper 38 collects the light phase following the dust freeing treatment through the channel 30.
  • the method of this invention is preferably implemented through the use of the device shown in Figure 3, where the first step (a) of wheat accumulation and dwell is carried out in the loading well 13; the layering step (b) is carried out on the first screen 21; the separation step (c) is carried out through the second screen 22; the second step (d) of light fraction accumulation and dwell is carried out in the discharge well 26; and the step (e) of wheat dropping into a thin layer is carried out through the laminar opening 30 in the direction of the arrow 39.
  • the granular material from the size grader 12 enters the discharge well 13, whose bottom 15 is vibrated along with the rigid vibrating body 17, being distributed across the machine length.
  • the vibrating bottom is also oscillated by a swivel joint 16 to afford continued adjustment of the breadth of the passage opening 40 to the incoming flow, for the purpose of keeping the level within the loading well 13 constant.
  • the first screen 21 performs layering of the wheat such that the light particles will move to the upper region by the combined effects of vibration and the upflowing stream of air.
  • the wheat will meet the second screen 22.
  • the heavy particles which had previously arranged themselves at the bottom of the wheat layer, will fall through the screen holes and be collected into the hopper 37; the light particles would instead be held suspended by the stream of air and reach the discharge well 26.
  • densimetric grading of the wheat is accomplished by removing from the stream of granular material a fraction enriched with the heavier particles. That fraction amounts to 50-70% of the infeed material.
  • the light fraction is introduced, by virtue of the vibratory movement, in the form of a sheet into the channel 30 where it is swept by an ascending air stream effective to remove the lightest grains and dust.
  • the so cleaned light fraction by treatment with air collects into the hopper 38.
  • the well 26 is of fundamental importance to the proper operation of the device. It is, in fact, occupied continuously by the light fraction which is effective to seal the air in. Lacking that seal, the air would tend to move, due to pressure differentials inside the hood 41 and the channel 30, through the port 27 in either direction, thus defeating formation of a uniform sheet or causing clogging of the terminating portion of the second screen 22.
  • the wall 29 of the channel 30 oscillates around the swivel joint 31 and affords construction of either a converging or diverging or parallel channel contingent on different air stream grading requirements.
EP86117028A 1985-12-09 1986-12-08 Verfahren und Vorrichtung zum Sortieren und Trockenreinigen von Weizen Withdrawn EP0247237A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2314485 1985-12-09
IT23144/85A IT1186418B (it) 1985-12-09 1985-12-09 Procedimento e dispositivo per la selezione e la pulitura a secco del grano

Publications (2)

Publication Number Publication Date
EP0247237A2 true EP0247237A2 (de) 1987-12-02
EP0247237A3 EP0247237A3 (de) 1988-06-22

Family

ID=11204250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117028A Withdrawn EP0247237A3 (de) 1985-12-09 1986-12-08 Verfahren und Vorrichtung zum Sortieren und Trockenreinigen von Weizen

Country Status (2)

Country Link
EP (1) EP0247237A3 (de)
IT (1) IT1186418B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103341442A (zh) * 2013-06-13 2013-10-09 山西天美食品有限公司 小麦清理用振动筛

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH254718A (de) * 1946-05-03 1948-05-31 Buehler Ag Geb Separator zum Reinigen von Körnerfrüchten.
FR1327882A (fr) * 1962-04-12 1963-05-24 Tripette & Renaud Perfectionnements aux nettoyeurs de grains par ventilation
US3441134A (en) * 1965-10-20 1969-04-29 Buehler Ag Geb Pneumatic separator and bulk solids feeder
US3852168A (en) * 1969-02-21 1974-12-03 Oetiker Hans Stratifier with a pneumatic product recirculation
GB2040190A (en) * 1979-01-19 1980-08-28 Buehler Ag Geb Process and apparatus for the dry cleaning of grain
EP0088064A2 (de) * 1982-03-03 1983-09-07 Kamas Westrup Ab Vorrichtung in Sortier- und Reinigungsmaschinen mit Sieb
EP0159050A1 (de) * 1981-02-23 1985-10-23 Bühler AG Trennvorrichtung für Getreide
WO1985005050A1 (en) * 1984-05-08 1985-11-21 Gebrüder Bühler Ag Installation and process for sorting heavy materials, in particular stones or the like from cereals or other bulk products

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH254718A (de) * 1946-05-03 1948-05-31 Buehler Ag Geb Separator zum Reinigen von Körnerfrüchten.
FR1327882A (fr) * 1962-04-12 1963-05-24 Tripette & Renaud Perfectionnements aux nettoyeurs de grains par ventilation
US3441134A (en) * 1965-10-20 1969-04-29 Buehler Ag Geb Pneumatic separator and bulk solids feeder
US3852168A (en) * 1969-02-21 1974-12-03 Oetiker Hans Stratifier with a pneumatic product recirculation
GB2040190A (en) * 1979-01-19 1980-08-28 Buehler Ag Geb Process and apparatus for the dry cleaning of grain
EP0159050A1 (de) * 1981-02-23 1985-10-23 Bühler AG Trennvorrichtung für Getreide
EP0088064A2 (de) * 1982-03-03 1983-09-07 Kamas Westrup Ab Vorrichtung in Sortier- und Reinigungsmaschinen mit Sieb
WO1985005050A1 (en) * 1984-05-08 1985-11-21 Gebrüder Bühler Ag Installation and process for sorting heavy materials, in particular stones or the like from cereals or other bulk products

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FETTE - SEIFEN - ANSTRICHMITTEL, vol. 83, special number, 1981, pages 534-540, M}nster, DE; Z. LEIBOVITZ et al.: "Die moderne Verarbeitung von Sonnenblumensaat" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103341442A (zh) * 2013-06-13 2013-10-09 山西天美食品有限公司 小麦清理用振动筛

Also Published As

Publication number Publication date
IT8523144A0 (it) 1985-12-09
IT1186418B (it) 1987-11-26
EP0247237A3 (de) 1988-06-22

Similar Documents

Publication Publication Date Title
US4319990A (en) Apparatus for the dry cleaning of grain
SU1480753A3 (ru) Устройство дл отделени т желых компонентов, в частности камней, из зерна и других сыпучих материалов
KR890004600B1 (ko) 그릿츠(grits) 정선장치
KR930008288B1 (ko) 곡물류의 건식 제분을 위한 전처리장치 및 그 방법
JP2525493B2 (ja) 穀物内混入物を分離するための方法および装置
JPS6139873B2 (de)
AU2005211588A1 (en) Vibratory material separator having adjustable air knife and a separation tube
US2404414A (en) Method and apparatus for removal of heavy objectionable material from cereals, legumes, and other food products
US3852168A (en) Stratifier with a pneumatic product recirculation
US5019242A (en) Particulate material cleaning apparatus
CN106269513A (zh) 粮食风选振动筛
CA1215683A (en) Inclined vibrated screen with pneumatic cyclonic flow input and pressure relief means
CA1203489A (en) Vibrating dewatering screen
EP0247237A2 (de) Verfahren und Vorrichtung zum Sortieren und Trockenreinigen von Weizen
US2764293A (en) High speed vacuum separator
RU2174877C2 (ru) Безрешетчатый вибрационный сепаратор
GB2059810A (en) Process and installation for removing dust from particles
JP2001046974A (ja) 廃棄物の分離回収方法とその装置
US5586660A (en) Process and apparatus for screening a stream of bulk material
EP0271608B1 (de) Vorrichtung zur Trennung von leichten Gegenständen aus Abfall
CN205146695U (zh) 粮食风选振动筛
US1843405A (en) Separation of solid materials of different specific gravities
US3380585A (en) Material purifying machine
RU2202420C1 (ru) Комбинированная зерноочистительная машина
JP2720757B2 (ja) 廃棄物の選別装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE DE FR GB LU NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE DE FR GB LU NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19881223

RIN1 Information on inventor provided before grant (corrected)

Inventor name: FRITTOLI, CLAUDIO

Inventor name: BONOLDI, LUIGI