CH291748A

CH291748A - Method for purifying cereals and purifying device for flour mills, for carrying out this method.

Info

Publication number: CH291748A
Authority: CH
Inventors: Limited Henry Simon Holdings
Original assignee: Limited Henry Simon Holdings
Priority date: 1950-04-03
Filing date: 1951-03-19
Publication date: 1953-07-15

Description

Procede pour 1'epuration de c6r6ales et dispositif epurateur de minoteries, pour la mise en Oeuvre de ce procede. Dans les dispositifs destines ä epurer les cereales au moyen de courants d'air, il est de coutume d'aspirer 1e eourant d'air ä 1'inte- rieur dun conduit vertical ä section rectan- gulaire, 1'alimentation en cereales s'effec- tuant sous forme dune couche de faible epaisseur, s'etalant sur tonte la longtieur d'un des cötes dudit conduit. Les imptiretes separees des c6r6ales par 1e courant d'air sont transportees en direction ascendante, 'a 1'in- t6i-ieur du eonduit et deposees dans un col- lecteur, tandis que les cereales tombent ä tra vers 1e courant d'air, dans une tremie de laquelle elles sont ensuite deehargees. 11 est ä noter que 1'efficacite de 1'epuration dimi- nue tres rapidement en rapport avec Faug- mentation de 1'epaisseur de la couche d.'ali- mentation, ce qui est dfi, dune part, au fait que 1e degie d'uniformite du courant d'air se trouve eire modifie et, d'autre Part, au Fait que des particules etrangeres sont entrainees avee les cereales Tors de leur chute. Daus 1e departement d'epuration dune mir_oterie, la quantite de c6r6ales s'ecotilant en i.n courant unique eontinu petit etre de plusieurs tonnes par heure et dans ces conditions il est impos- sible de Bonner ä la couche une epaisseur suffisamment Faible pour que soit realisee une epuration satisfaisante par une machine ne presentant pas des dimensions exagerees. Process for the purification of cereals and purifier device for flour mills, for the implementation of this process. In devices intended to purify cereals by means of air currents, it is customary to suck the air current inside a vertical duct of rectangular section, the cereal supply being taking the form of a thin layer, spreading over all the length of one of the sides of said conduit. The impurities separated from the cereals by the air current are transported in an upward direction, inside the duct and deposited in a collector, while the cereals fall through the air current. into a hopper from which they are then discharged. It should be noted that the efficiency of the purification decreases very quickly in relation to the increase in the thickness of the feed layer, which is due, on the one hand, to the fact that the degie uniformity of the air current is found to be modified and, on the other hand, to the fact that foreign particles are entrained with the cereals during their fall. In the sewage department of a mirror factory, the quantity of cereals slurrying in a single continuous current can be several tons per hour and under these conditions it is a satisfactory purification by a machine not presenting exaggerated dimensions.

L n des buts de la presente Invention est de fournir un dispositif epurateur permet- taut d'obtenir un degre tres eleve d'epura- tion, en separant des c6r6ales totis les corps etrangers pouvant eire enleves par un cou- rant d'air, sans que les dimensions de ce dis- positif deviennent excessives. One of the aims of the present invention is to provide a purifying device which makes it possible to obtain a very high degree of purification, by separating from the cereals all the foreign bodies which can be removed by a current of air, without the dimensions of this device becoming excessive.

La presente Invention a pour objet un procede pour 1'epuration de cereales mkan- g6es ä des particules etrangeres, caracterise . en ce qu'on soumet la totalite des cereales s'ecoulant en couche ä. un premier courant d'air dont la vitesse est suffisante pour enle- v er des c6r6ales toutes ces particules etran- gAres, ledit courant d'air pouvant entrainer une faible quantite de cereales melees inti- mement aux particules etrangeres, an recueille dans un collecteur les matieres sonlevees, an cree une deuxieme couche d'ecoulement des matieres ainsi recueillies et FonRTI ID="0001.0272" WI="11" HE="3" LX="1533"LY="1668"> soumet ladite couche ä an second courant d'air de vitesse suffisante pour separer les particules etran- geres des cereales, an Fait passer ce second courant d'air dann un second collecteur oü i'on recueille les maueres soulevees, ce second collecteur etant traverse egalement par Fair provenant du premier collecteur, et en ce qu'on exerce ä 1'extremite du second collec- teur tune aspiration d'air pour creer 1e preinier et 1e second courant d'air. The subject of the present invention is a process for the purification of cereals mixed with foreign particles, characterized. in that the totality of the cereals flowing in a layer is subjected. a first stream of air, the speed of which is sufficient to remove all these foreign particles from the cereals, said stream of air being able to entrain a small quantity of cereals intimately mixed with the foreign particles, an collected in a collector the materials lifted, an creates a second flow layer of the materials thus collected and FonRTI ID="0001.0272" WI="11" HE="3" LX="1533"LY="1668"> subjects said layer to a second current of air of sufficient speed to separate the foreign particles from the cereals, an Passes this second current of air into a second collector where the raised dust is collected, this second collector also being crossed by air coming from the first collector, and in that an air suction is exerted at the end of the second collector to create the first and the second air stream.

L'invention comprend encore un disposi- tif epurateur de minoterie pour la mise en Oeuvre du procede ei-dessus defini. Ce dispositif est caraeterise par 1e Fait qu'il comprend une Premiere voie inclinee alimentee en eWales et donnant acces lateralement ä un Premier conduit vertical dont 1'extremite superieure communique avec ün Premier colleeteur, ledit Premier conduit vertical etant parcouru par un eourant d'air ascendant de v itesse suffisante pour separer des eWales toutes les particules etrangeres, la base de ce Premier collecteur conduisant ä une deuxieme v oie inclinee donnant acces lateralement ä. un second conduit vertical dont 1'extreniite sliperieure communique avec un second eol- lecteur, ledit second conduit vertical etant parcouru par un second courant d'air de v itesse suffisante pour separer les partieules etrangeres des eereales, un Passage d'ouver- ture reglable entre 1e preinier et 1e second eollecteur, enfin un aspirateur monte sur 1e second collecteur et destine ä creer lesdits Premier et second eourants d'air. The invention further comprises a flour mill purifier device for implementing the process defined above. This device is characterized by the fact that it comprises a First inclined channel supplied with eWales and giving access laterally to a First vertical duct, the upper end of which communicates with a First collector, said First vertical duct being traversed by a stream of air ascending with sufficient speed to separate all the foreign particles from the eWales, the base of this first collector leading to a second inclined path giving access laterally. a second vertical duct, the lower end of which communicates with a second collector, said second vertical duct being traversed by a second air current of sufficient speed to separate the foreign particles from the cereals, an adjustable opening passage between the first and the second collector, finally a vacuum cleaner rises on the second collector and is intended to create said first and second air currents.

En reference aux dessins explicatifs ci- joints, representant une forme d'exeeution du dispositif epurateur, objet de la presente invention La fig. 1 represente, en elev ation et en coupe, 1e dispositif epurateur. With reference to the accompanying explanatory drawings, representing one form of execution of the purifying device, object of the present invention FIG. 1 represents, in elevation and in section, the first purification device.

.La fig. 2 represente une vlte en elevation en bout en regardant de gauche ä droite la fig. 1. .Fig. 2 represents a vlte in end elevation looking from left to right in fig. 1.

La fig. 3 represente une vue en elevation en bout en regardant la fig. 1 de droite ä gauche. fig. 3 shows an end elevational view looking at FIG. 1 from right to left.

L'alimentation en eWales du dispositif epurateur s'effectue en cs, les cereales etant debitees en une mince couche glissant Sur la Plaque inclinee b, de laquelle elles tombent ä. Finterieur du conduit vertical c dans lequel eircule un courant d'air ascendant a.vant une vitesse stiffisante pour que toute@ matiere etrangere se separe des cereales, les particules soulevees etant transportees vers 1e haut. et. cleposees dann 1e preinier collecteur d. L'as- piration de Pair cireulant dann 1e conduit c a lieu par Fouverture disposee en e. L'air est aspire par un ventilateur dispose ä Fouver- ture de sortie f. Etant donne qu'une certaine preportion de cereales est entrainee avec les matieres etrangeres gräce ä la vitesse elevee du courant d'air ascendant dann 1e conduit c, an fait passec les produits deposes dans 1e eollecteur d, sous forme egalenient dune couche de Faible epaisseur, glissant sur la Plaque inclinee g dans 1e conduit vertical h, ä Pinterieur duquel cireule un eourant d'air ascendant qui penetre par Fembranchement i, ce courant d'air ayant une vitesse suffisam- inent elevee poar etre ä meme d'entrainer les corps etrangers melanges aux RTI ID="0002.0275" WI="13" HE="4" LX="1703" LY="629"> eereales. Les particules soulevees et entrainees en direction ascendante dans 1e eonduit h, se deposent dans 1e deuxieme collecteur ,j, ce dernier etant egalement traverse par Fair aspire par Pouverture e. The supply of eWales to the purifying device takes place in cs, the cereals being debited in a thin layer sliding On the inclined Plate b, from which they fall ä. The interior of the vertical duct c in which an ascending air current circulates at a stiffening speed so that any foreign matter separates from the cereals, the particles raised being transported upwards. And. cleposed in the 1st manifold d. The suction of circulating air in the duct c takes place through the opening arranged at e. The air is sucked in by a fan located at the outlet opening f. Since a certain proportion of cereals is entrained with the foreign matter thanks to the high speed of the ascending air current in the duct c, the products deposited in the collector d pass, also in the form of a thin layer. , sliding on the inclined plate g in the vertical duct h, inside which there flows an ascending current of air which enters through the branch i, this current of air having a sufficiently high speed to be able to entrain the bodies foreign materials mixed with RTI ID="0002.0275" WI="13" HE="4" LX="1703" LY="629"> cereals. The particles lifted and entrained in the upward direction in the educt h, are deposited in the second collector, j, the latter also being crossed by the air sucked in by the opening e.

Un volet k. perniet de regler 1e debit d'air trau ersant 1e Premier eollecteur d, tandis qu'un volet vz permet de regler 1e debit d'air prov enant du conduit h et trau ersant 1e second collecteur ;j. A shutter k. allows to adjust the first air flow trau ersant the first eollecteur d, while a shutter vz allows to adjust the first air flow coming from the duct h and trau ersant the first second collector; j.

Les eWales qui deseendent 1e long du conduit c passent lateralement en n afin de contourner Fouverture d'entree de Fair aspire ä. travers 1e eonduit vertical h. Les cereales epurees sont recueillies 'a la sortie du con- duit o. The eWales which descend along the duct c pass laterally at n in order to circumvent the entrance opening of the aspirate ä. through the 1st vertical duct h. The purified cereals are collected at the outlet of the conduit o.

Les produits recueillis ä la sortie du con- duit p sont en grande Partie des eereales epurees qui peuvent etre melangees avec les produits recueillis ä la sortie du conduit o. The products collected at the outlet of conduit p are largely purified cereals which can be mixed with the products collected at the outlet of conduit o.

Toutefois, etant donne que la Separation effectuee par 1e eourant cl'air montant dass 1e conduit h pourrait ne pas av oir une effi- caeite de 10011/o et que, par eonsequent, les produits souleves par 1e second courant d'air pourraient contenir eneore quelques impu- retes, il est preferable de reprendre les pro- diiits recueillis ä la sortie du conduit p et de les ramener dans 1e dispositif epurateur en a. dans 1e but de les souniettre ä un nouveau traitement jusqu'ä ee que toutes ]es impu- i-etes soient separees des cereales. However, since the Separation effected by the air stream rising in duct h might not have an efficiency of 1001/o and that, consequently, the products lifted by the second air stream might contain still some impurities, it is preferable to take the products collected at the outlet of the conduit p and bring them back into the purifying device at a. with the aim of subjecting them to a new treatment until all the impurities are separated from the cereals.

La eouelie de produits glissant Sur la Plaque g et soumise ä Faction epuratrice du deuxieme courant d'air, montant dans 1e eonduit vertical h, peut avoir une epaisseur d'environ 1/1o ä 1/3o de Gelle de la couche de produits soumise au Premier courant d'air, montant dann 1e conduit vertical c, ce qui pennet de realiser une separation plus pous- #,ees des particules etrangeres par 1e deuxi#me eourant d'air. The layer of products sliding on the plate g and subjected to the purifying action of the second air current, rising in the vertical duct h, can have a thickness of approximately 1/1o to 1/3o of the layer of products subjected to the first stream of air, rising in the first vertical duct c, which allows a more thorough separation of the foreign particles to be achieved by the second air stream.

Les produits decharges par 1'ouverture q du deuxieme collecteur j se composent des impuretes separees des cereales traitees. The products discharged from the opening q of the second collector j consist of the impurities separated from the treated cereals.

Claims

CLAIMS I. Process for the purification of cereals mixed with light foreign particles, characterized in that the totality of the cereals flowing in a layer is subjected to a first stream of air whose speed is sufficient to remove cereals all these foreign particles, said stream of air being able to entrain a small quantity of cereals intimately mixed with the foreign particles, the materials raised are collected in a collector, a second flow layer of the materials thus collected is created and the material is subjected to said layer at a second air current of sufficient speed to separate the foreign particles from the cereals, and causes this second air current to pass into a second collector where the materials raised are collected, this second collector also being passed through by fair coming from the first collector, and in that an air suction is exerted at the end of the second collector to create the first and the second air currents. II. Purifying device for flour mills, intended for the implementation of the process of claim I, characterized in that it comprises a First inclined channel (b) fed with cereals and giving access laterally to -an First vertical conduit (c) equips the upper end of the communication with a first collector (d), said first vertical duct being traversed by an ascending current of air of sufficient speed to separate all the foreign particles from the cereals, the base of this first collector leading to a second inclined path (q) giving acAs laterally to a second vertical duct (h) has the upper end communicating with a second collector (j), said second vertical duct being traversed by a second air current of sufficient speed to separate the foreign particles from the cereals, an adjustable opening passage (k) between the first and the second collector, finally a vacuum cleaner mounted on the second collector and intended to remove the said first and second air currents . SUB-CLAIMS 1. Purifying device according to claim II, characterized in that the passage opening between the first and the second air stream is regulated by RTI ID="0003.0268" WI="5" HE= "4" LX="1512" LY="1358"> a pane.

2. Purifying device according to claim II and sub-claim 1, characterized by the fact that it comprises a flap (m) for regulating the passalte opening connecting the upper end of the second vertical duct and the second manifold (j).