EP0345178A1 - Apparatus for completely scraping off the cake produced in controlled centrifuges - Google Patents

Apparatus for completely scraping off the cake produced in controlled centrifuges Download PDF

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Publication number
EP0345178A1
EP0345178A1 EP89420192A EP89420192A EP0345178A1 EP 0345178 A1 EP0345178 A1 EP 0345178A1 EP 89420192 A EP89420192 A EP 89420192A EP 89420192 A EP89420192 A EP 89420192A EP 0345178 A1 EP0345178 A1 EP 0345178A1
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EP
European Patent Office
Prior art keywords
squeegee
scraper
knife
edge
shaft
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.)
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Application number
EP89420192A
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German (de)
French (fr)
Inventor
Bernard Carbon
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Robatel SLPI SA
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Robatel SLPI SA
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Publication date
Application filed by Robatel SLPI SA filed Critical Robatel SLPI SA
Publication of EP0345178A1 publication Critical patent/EP0345178A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/08—Skimmers or scrapers for discharging ; Regulating thereof
    • B04B2011/086—Skimmers or scrapers for discharging ; Regulating thereof with a plurality of scraper blades

Definitions

  • the present invention relates to cycle centrifuges and it relates in particular to the scraping of the cake obtained in the rotor once the centrifugation operation is completed.
  • the scraping of the cake is carried out either with a scraper whose length is identical to that of the basket, or by means of a knife which is shorter than the length of the basket.
  • the scraping device is mounted on a shaft which allows its tilting so that the scraper or the knife penetrates into the cake to eliminate it ("deflate"). If we are dealing with a knife, the shaft in question is subjected to an axial movement allowing the movement of said knife over the entire length of the basket.
  • the basket is made in the form of a perforated grille internally coated with a filter cloth, so that in order not to damage these two elements, it is necessary to stop the plunge of the scraper or the knife at a suitable distance from the canvas and the grille. Under these conditions, there remains a peripheral layer of cake called a neutral layer which the usual scraping devices are unable to remove. We therefore have recourse to auxiliary members which are powerful blowers or else to other devices such as auxiliary scrapers which are not integral with the main scraper. Under these conditions, on a wringer with a horizontal axis, the material falls into the bottom of the basket, so that it is necessary to perform a subsequent operation to extract this material from the centrifuge.
  • the improvements which are the subject of the present invention aim to remedy these drawbacks and to allow the production of a complete scraper device for the cake obtained in the rotor of a centrifuge.
  • the scraper device associates the secondary scraping means with the scraper or main knife, the secondary scraping means being brought into action by an additional rotation of the scraper or main knife capable of causing only one low penetration of the latter into the neutral layer and a radial displacement of the secondary scraping means such that the latter can remove all of the neutral layer.
  • the device according to the invention comprises an oscillating blade holder secured to a tilting shaft mounted eccentric relative to the central axis of the basket, this arm being oriented towards the outside to carry a squeegee the active edge of which is further from the center of the shaft than the edge of the scraper or knife and on a radius offset in the direction of rotation of the basket with respect to that which passes through said edge of the scraper or knife, that is to say that the active edge of the squeegee is located outside the scraper or knife relative to its shaft.
  • a flexible squeegee is preferably provided, preventing any deterioration of the filter cloth and / or of the basket grille.
  • the non-liquid elements condense in the form of a "cake" 2 which adheres to the internal face of the wall 1 and is therefore in tubular form.
  • the front face of the centrifuge supports a shaft 3 mounted in suitable bearings, not shown, and which can pivot to cause the rotation of the scraper device according to the invention which has been generally referenced 4. It is observed that this device 4 is located at - above a recovery chute 5.
  • the device according to the invention firstly comprises a tubular sleeve 6 wedged angularly on the shaft 3 by means of a key 7 (fig. 1). Under these conditions, any rotary or longitudinal movement of the shaft 3 is transmitted to the sleeve 6. From the latter stands a veil 8 normal to said sleeve and the end of which carries a plate 9 oriented parallel to the sleeve, this is that is to say directed perpendicularly to the web 8.
  • the web 8-plate 9 assembly forms a blade holder.
  • On the plate 9 is fixed a blade 10 by means of appropriate screws 11.
  • the blade 10 constitutes a scraper, the end edge 10 a of which , oriented parallel to the axis of the shaft 3, is intended to remove the cake 2.
  • an arm 12 extends outwards from the plate 9 and carries a sole 13 oriented obliquely with respect to the plate 9, so that it diverges towards the outside with respect to the latter.
  • the sole 13 allows the fixing of a multitude of strips clamped against said sole by a counter plate 15 thanks to bolts 16 cooperating with the sole considered.
  • the set of blades forms a squeegee 14 whose active edge 14 a is intended for scraping the neutral layer of the cake 2.
  • the edge 14a is more distant from the center of the shaft 3 that the edge 10a of the blade 10 while it is on a radius in the offset without rotation of the basket has been illustrated by the arrow F and which corresponds clockwise, with respect to the radius which passes through the edge 10 a of the blade 10.
  • the active edge 14 a of the squeegee 14 is located outside of the blade 10 relative to the shaft 3.
  • the illustration in fig. 1 shows the cake 2 attached to the wall 1 of the basket of the centralizing machine, while the scraper device 4 is erased inside the chute 5.
  • the shaft 3 is rotated in the opposite direction to that of the basket, that is to say in the counterclockwise direction (arrows F1 of fig. 3 and 4) for the illustrated example.
  • the active edge 10 a of the blade 10 attacks the cake 2 and eliminates it little by little, the fragments falling into the chute 5.
  • the rotation of the shaft 3 takes place up to a stop, not shown , corresponding to the position of fig. 3 of the device 4.
  • This figure shows that there is a layer 2 has cake 2 between the extreme position of the edge 10a of the blade 10 and the inner face of the wall 1.
  • the edges 10a and 14a are in the vicinity of the circumference which corresponds to the internal face of the neutral layer 2 a .
  • the invention is applicable to both horizontal and vertical centrifuges.
  • a device for scraping the cake obtained in the rotor of a centrifuge was thus produced completely automatically without manual intervention, by simple eclipsing of the stop of the end of the first stroke of said device, which eclipsing can be programmed automatically.

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  • Centrifugal Separators (AREA)

Abstract

It comprises, as is conventional, an oscillating blade carrier (8-9) integrally connected to a swivelling shaft (3) mounted eccentrically relative to the centre axis (0) of the drum (1). According to the invention, the blade carrier comprises an arm (12) facing outwards and which supports a stripper (14), the working edge (14a) of which is situated further from the said shaft (3) than the edge (10a) of the scraper or knife (10). This edge (14a) is situated on a radius off set in the direction of rotation (F) of the drum (1) relative to that which passes through the edge (10a) of the scraper or knife (10). In other words, the said working edge (14a) of the stripper (14) is situated outside the scraper or knife (10) relative to its shaft (3). Stops, not shown, make it possible to determine the successive travels of the device according to the invention. Beyond the first stop, the working edge (10a) of the scraper or knife (10) is non-operational, whereas that (14a) of the stripper (14) removes the neutral layer (2a) applied against the inner face of the wall (1) of the drum. <IMAGE>

Description

La présente invention est relative aux centrifugeuses à cycles et elle a notamment trait au raclage du gâteau obtenu dans le rotor une fois que l'opération de centrifugation est terminée.The present invention relates to cycle centrifuges and it relates in particular to the scraping of the cake obtained in the rotor once the centrifugation operation is completed.

On sait que l'effet de la centrifugation est l'obtention d'un gâteau plus ou moins pâteux qui recouvre la périphérie du panier de la centri­fugeuse et se présente donc sous forme tubulaire. Il est indispensable de racler ce gâteau pour récupérer la matière qui le constitue dans une goulotte appropriée.We know that the effect of centrifugation is to obtain a more or less pasty cake which covers the periphery of the basket of the centrifuge and is therefore in tubular form. It is essential to scrape this cake to recover the material which constitutes it in an appropriate chute.

Le raclage du gâteau s'effectue soit avec un racloir dont la longueur est identique à celle du panier, soit au moyen d'un couteau qui est plus court que la longueur du panier. Dans les deux cas, le dispositif de ra­clage est monté sur un arbre qui permet son basculement afin que le ra­cloir ou le couteau pénètre dans le gâteau pour l'éliminer (le "débâ­tir"). Si l'on a affaire à un couteau, l'arbre en question est soumis à un mouvement axial permettant le déplacement dudit couteau sur toute la longueur du panier.The scraping of the cake is carried out either with a scraper whose length is identical to that of the basket, or by means of a knife which is shorter than the length of the basket. In both cases, the scraping device is mounted on a shaft which allows its tilting so that the scraper or the knife penetrates into the cake to eliminate it ("deflate"). If we are dealing with a knife, the shaft in question is subjected to an axial movement allowing the movement of said knife over the entire length of the basket.

Le panier est réalisé sous la forme d'une calandre perforée revêtue in­térieurement d'une toile filtrante, de telle sorte que pour ne pas dé­tériorer ces deux éléments, il est nécessaire d'arrêter la plongée du racloir ou du couteau à une distance convenable de la toile et de la ca­landre. Dans ces conditions, il subsiste une couche périphérique de gâ­teau appelée couche neutre que les dispositifs de raclage usuels sont incapables d'enlever. On a donc recours à des organes auxiliaires qui sont des souffleries puissantes ou bien à d'autres dispositifs tels que des raclettes auxiliaires non solidaires du racloir principal. Dans ces conditions, sur une essoreuse à axe horizontal, la matière tombe dans le bas du panier, de telle sorte qu'il est nécessaire d'effectuer une opé­ration subséquente pour extraire cette matière de la centrifugeuse.The basket is made in the form of a perforated grille internally coated with a filter cloth, so that in order not to damage these two elements, it is necessary to stop the plunge of the scraper or the knife at a suitable distance from the canvas and the grille. Under these conditions, there remains a peripheral layer of cake called a neutral layer which the usual scraping devices are unable to remove. We therefore have recourse to auxiliary members which are powerful blowers or else to other devices such as auxiliary scrapers which are not integral with the main scraper. Under these conditions, on a wringer with a horizontal axis, the material falls into the bottom of the basket, so that it is necessary to perform a subsequent operation to extract this material from the centrifuge.

On comprend aisément que l'opération d'élimination de la couche neutre par les méthodes usuelles entraîne une perte de temps considérable, puisque d'une part il est nécessaire de mettre en route un organe acces­soire et d'autre part, sur les essoreuses àaxe horizontal, il est indis­pensable de récupérer la matière produite par cette opération secon­daire.It is easy to understand that the operation of eliminating the neutral layer by the usual methods results in a considerable loss of time, since on the one hand it is necessary to start an accessory member and on the other hand, on the spin dryers horizontal, it is essential to recover the material produced by this secondary operation.

Les perfectionnements qui font l'objet de la présente invention visent à remédier à ces inconvénients et à permettre la réalisation d'un dispo­sitif de raclage complet du gâteau obtenu dans le rotor d'une centrifu­geuse.The improvements which are the subject of the present invention aim to remedy these drawbacks and to allow the production of a complete scraper device for the cake obtained in the rotor of a centrifuge.

A cet effet, le dispositif de raclage suivant l'invention associe les moyens de grattage secondaires au racloir ou couteau principal, les moyens de grattage secondaires étant mis en action par une rotation sup­plémentaire du racloir ou couteau principal propre à n'entraîner qu'un faible enfoncement de celui-ci dans la couche neutre et un déplacement radial des moyens de grattage secondaires tel que ces derniers puissent supprimer toute la couche neutre.To this end, the scraper device according to the invention associates the secondary scraping means with the scraper or main knife, the secondary scraping means being brought into action by an additional rotation of the scraper or main knife capable of causing only one low penetration of the latter into the neutral layer and a radial displacement of the secondary scraping means such that the latter can remove all of the neutral layer.

Dans un mode d'éxécution préféré, le dispositif suivant l'invention comprend un porte-lame oscillant solidaire d'un arbre basculant monté excentré par rapport à l'axe central du panier, ce bras étant orienté vers l'extérieur pour porter une raclette dont l'arête active se trouve plus éloignée du centre de l'arbre que l'arête du racloir ou couteau et sur un rayon décalé dans le sens de la rotation du panier par rapport à celui qui passe par ladite arête du racloir ou couteau, c'est-à-dire que l'arête active de la raclette est située à l'extérieur du racloir ou couteau par rapport à son arbre.In a preferred embodiment, the device according to the invention comprises an oscillating blade holder secured to a tilting shaft mounted eccentric relative to the central axis of the basket, this arm being oriented towards the outside to carry a squeegee the active edge of which is further from the center of the shaft than the edge of the scraper or knife and on a radius offset in the direction of rotation of the basket with respect to that which passes through said edge of the scraper or knife, that is to say that the active edge of the squeegee is located outside the scraper or knife relative to its shaft.

On prévoit préférablement une raclette souple évitant toute détériora­tion de la toile filtrante et/ou de la calandre du panier.A flexible squeegee is preferably provided, preventing any deterioration of the filter cloth and / or of the basket grille.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :

  • Fig. 1 est une coupe transversale partielle du panier d'une centri­fugeuse horizontale pourvue d'un dispositif de raclage conforme à l'invention.
  • Fig. 2 est une vue en perspective à plus grande échelle du dispo­sitif de raclage établi conformément à l'invention.
  • Fig. 3 et 4 sont des vues semblables à celle de fig. 1, illustrant la manière de fonctionner du dispositif de raclage suivant l'inven­ tion.
The appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
  • Fig. 1 is a partial cross section of the basket of a horizontal centrifuge provided with a scraping device according to the invention.
  • Fig. 2 is a perspective view on a larger scale of the scraping device established in accordance with the invention.
  • Fig. 3 and 4 are views similar to that of FIG. 1, illustrating the manner of operation of the scraper device according to the invention tion.

On a représenté en fig. 1 à 3 le panier d'une centrifugeuse à axe hori­zontal référencé O, la paroi du panier, qui a été référencée 1, compre­nant à la manière connue une calandre perforée sur la face intérieure de laquelle est plaquée une toile filtrante. Pour la facilité de la repré­sentation du dessin, cet ensemble a été représenté par une simple paroi hachurée.There is shown in fig. 1 to 3 the basket of a centrifuge with a horizontal axis referenced O, the wall of the basket, which has been referenced 1, comprising in the known manner a perforated calender on the inner face of which is placed a filter cloth. For ease of representation of the drawing, this set has been represented by a simple hatched wall.

A la fin de l'opération de centrifugation, les éléments non liquides se condensent sous la forme d'un "gâteau" 2 qui adhère à la face interne de la paroi 1 et se présente donc sous forme tubulaire.At the end of the centrifugation operation, the non-liquid elements condense in the form of a "cake" 2 which adheres to the internal face of the wall 1 and is therefore in tubular form.

La face avant de la centrifugeuse supporte un arbre 3 monté dans des paliers appropriés non représentés et pouvant pivoter pour entraîner la rotation du dispositif de raclage suivant l'invention qui a été réfé­rencé de manière générale 4. On observe que ce dispositif 4 se trouve au-dessus d'une goulotte de récupération 5.The front face of the centrifuge supports a shaft 3 mounted in suitable bearings, not shown, and which can pivot to cause the rotation of the scraper device according to the invention which has been generally referenced 4. It is observed that this device 4 is located at - above a recovery chute 5.

Comme illustré en fig. 2, le dispositif suivant l'invention comprend tout d'abord un manchon tubulaire 6 calé angulairement sur l'arbre 3 au moyen d'une clavette 7 (fig. 1). Dans ces conditions, tout mouvement rotatif ou longitudinal de l'arbre 3 est transmis au manchon 6. A partir de ce dernier se dresse un voile 8 normal audit manchon et dont l'extré­mité porte une plaquette 9 orientée parallèlement au manchon, c'est-à-­dire dirigée perpendiculairement au voile 8. L'ensemble voile 8-plaquet­te 9 forme un porte-lame. Sur la plaquette 9 est fixée une lame 10 au moyen de vis appropriées 11. La lame 10 constitue un racloir dont l'arête terminale 10a, orientée parallèlement à l'axe de l'arbre 3, est destinée à éliminér le gâteau 2.As illustrated in fig. 2, the device according to the invention firstly comprises a tubular sleeve 6 wedged angularly on the shaft 3 by means of a key 7 (fig. 1). Under these conditions, any rotary or longitudinal movement of the shaft 3 is transmitted to the sleeve 6. From the latter stands a veil 8 normal to said sleeve and the end of which carries a plate 9 oriented parallel to the sleeve, this is that is to say directed perpendicularly to the web 8. The web 8-plate 9 assembly forms a blade holder. On the plate 9 is fixed a blade 10 by means of appropriate screws 11. The blade 10 constitutes a scraper, the end edge 10 a of which , oriented parallel to the axis of the shaft 3, is intended to remove the cake 2.

On ne décrira pas plus avant un tel dispositif bien connu dans la pra­tique.We will not describe any further such a device well known in practice.

Conformément à l'invention, un bras 12 s'étend vers l'extérieur à partir de la plaquette 9 et porte une semelle 13 orientée obliquement par rap­port à la plaquette 9, de telle sorte qu'elle diverge vers l'extérieur par rapport à cette dernière. La semelle 13 permet la fixation d'une multitude de lamelles serrées contre ladite semelle par une contre­ plaque 15 grace à des boulons 16 coopérant avec la semelle considérée. Ainsi, l'ensemble des lamelles forme une raclette 14 dont l'arête active 14a est destinée au raclage de la couche neutre du gâteau 2.According to the invention, an arm 12 extends outwards from the plate 9 and carries a sole 13 oriented obliquely with respect to the plate 9, so that it diverges towards the outside with respect to the latter. The sole 13 allows the fixing of a multitude of strips clamped against said sole by a counter plate 15 thanks to bolts 16 cooperating with the sole considered. Thus, the set of blades forms a squeegee 14 whose active edge 14 a is intended for scraping the neutral layer of the cake 2.

Comme illustré plus particulièrement en fig. 3 et 4, l'arête 14a se trouve plus éloignée du centre de l'arbre 3 que l'arête 10a de la lame 10, tandis qu'elle se trouve sur un rayon décalé dans le sans de la ro­tation du panier qui a été illustré par la flèche F et qui correspond au sens horaire, par rapport au rayon qui passe par l'arête 10a de la lame 10. Autrement dit, l'arête active 14a de la raclette 14 est située à l'extérieur de la lame 10 par rapport à l'arbre 3.As illustrated more particularly in FIG. 3 and 4, the edge 14a is more distant from the center of the shaft 3 that the edge 10a of the blade 10 while it is on a radius in the offset without rotation of the basket has been illustrated by the arrow F and which corresponds clockwise, with respect to the radius which passes through the edge 10 a of the blade 10. In other words, the active edge 14 a of the squeegee 14 is located outside of the blade 10 relative to the shaft 3.

Le fonctionnement découle des explications qui précèdent :The operation follows from the above explanations:

L'illustration de fig. 1 montre le gâteau 2 accolé à la paroi 1 du pa­nier de la centrigeuse, tandis que le dispositif de raclage 4 est effacé à l'intérieur de la goulotte 5.The illustration in fig. 1 shows the cake 2 attached to the wall 1 of the basket of the centralizing machine, while the scraper device 4 is erased inside the chute 5.

Pour supprimer le gâteau 2, on imprime à l'arbre 3 une rotation dans le sens contraire à celui du panier, c'est-à-dire dans la direction anti-­horaire (flèches F1 de fig. 3 et 4) pour l'exemple illustré. Ainsi, l'arête active 10a de la lame 10 attaque le gâteau 2 et l'élimine petit à petit, les fragments tombant dans la goulotte 5. La rotation de l'arbre 3 s'effectue jusqu'à une butée, non représentée, correspondant à la position de fig. 3 du dispositif 4. On observe sur cette figure qu'il reste une couche 2a de gâteau 2 entre la position extrême de l'arête 10a de la lame 10 et la face interne de la paroi 1.To remove the cake 2, the shaft 3 is rotated in the opposite direction to that of the basket, that is to say in the counterclockwise direction (arrows F1 of fig. 3 and 4) for the illustrated example. Thus, the active edge 10 a of the blade 10 attacks the cake 2 and eliminates it little by little, the fragments falling into the chute 5. The rotation of the shaft 3 takes place up to a stop, not shown , corresponding to the position of fig. 3 of the device 4. This figure shows that there is a layer 2 has cake 2 between the extreme position of the edge 10a of the blade 10 and the inner face of the wall 1.

Du fait de la géométrie particulière du dispositif suivant l'invention, dans ladite position extrême, c'est-à-dire lorsque ledit dispositif arrive contre la première butée, les arêtes 10a et 14a se trouvent au voisinage de la même circonférence qui correspond à la face interne de la couche neutre 2a.Due to the particular geometry of the device according to the invention, in said extreme position, that is to say when said device comes against the first stop, the edges 10a and 14a are in the vicinity of the circumference which corresponds to the internal face of the neutral layer 2 a .

La butée précitée est alors éclipsée, de telle sorte que le mouvement de rotation dans le sens de la flèche F1 de l'arbre 3 peut continuer. Par suite de la géométrie particulière du dispositif suivant l'invention, l'on constate que la poursuite de la rotation du dispositif 4 dans le sens de la flèche F1 permet une plongée plus rapide de la raclette 14 que celle de la lame 10 en direction de la paroi 1. Ainsi, lorsque l'a­rête 14a de la raclette 14 vient pratiquement en appui contre la face interne de la paroi 1, déplacement qui est limité par une seconde butée non représentée, on est assuré que l'arête 10a de la lame 10 n'entre ab­solument pas en contact avec la paroi 1 et ne risque donc pas de la dé­tériorer. Du fait que la raclette 14 est prévue souple ou composée de lamelles souples, il n'y a aucun risque de détérioration de ladite paroi 1.The abovementioned stop is then eclipsed, so that the rotational movement in the direction of the arrow F1 of the shaft 3 can continue. As a result of the particular geometry of the device according to the invention, it can be seen that the continued rotation of the device 4 in the direction of the arrow F1 allows the squeegee 14 to dive more quickly. as that of the blade 10 in the direction of the wall 1. Thus, when the edge 14 a of the squeegee 14 comes practically to bear against the internal face of the wall 1, displacement which is limited by a second stop not shown, is ensured that the edge 10a of the blade 10 enters absolutely not contact the wall 1 and thus does not risk damaging it. Because the squeegee 14 is provided flexible or composed of flexible strips, there is no risk of deterioration of said wall 1.

Bien entendu, on pourrait prévoir d'utiliser une raclette 14 rigide, tandis que le bras 12 serait souple ou encore, dans des cas extrêmes, prévoir que la raclette 14 et ce dernier soient tous les deux souples.Of course, one could plan to use a rigid squeegee 14, while the arm 12 would be flexible or, in extreme cases, provide that the squeegee 14 and the latter are both flexible.

Comme illustré en fig. 4, on constate que les fragments produits par la raclette 14 tombent également dans la goulotte 5 pour être récupérés directement sans aucune manipulation.As illustrated in fig. 4, we see that the fragments produced by the squeegee 14 also fall into the chute 5 to be recovered directly without any manipulation.

En particulier, l'invention est applicable aussi bien aux centrifugeuses horizontales qu'à celles verticales.In particular, the invention is applicable to both horizontal and vertical centrifuges.

Il va de soi que la raclette 14 pourrait être réalisée de n'importe quelle manière, à condition que son arête 14a réponde aux exigences ci­tées.It goes without saying that the wiper 14 could be performed in any manner, provided that its edge 14 to meet the stated requirements.

On a ainsi réalisé un dispositif de raclage complet du gâteau obtenu dans le rotor d'une centrifugeuse de manière entièrement automatique sans intervention manuelle, par simple éclipsage de la butée de la fin de la première course dudit dispositif, lequel éclipsage pouvant être programmé automatiquement.A device for scraping the cake obtained in the rotor of a centrifuge was thus produced completely automatically without manual intervention, by simple eclipsing of the stop of the end of the first stroke of said device, which eclipsing can be programmed automatically.

Claims (7)

1. Dispositif de raclage complet du gâteau (2) obtenu dans le rotor ou panier d'une centrifugeuse à cycles, du genre comportant un racloir à mouvement radial déterminé par une rotation autour d'un arbre excentré par rapport à l'axe (0) du rotor et qui opère de telle sorte qu'il lais­se intacte une couche périphérique ou "couche neutre" (2a) éliminée en­suite par des moyens auxiliaires tels qu'une raclette susceptible de se déplacer longitudinalement par rapport au racloir, caractérisé en ce que la raclette (14) est mise en action par une rotation supplémentaire du racloir ou couteau (10) propre à n'entraîner qu'un faible enfoncement de celui-ci dans la couche neutre (2a) et un déplacement radial de la ra­clette (14) tel que celle-ci puisse éliminer toute la "couche neutre" (2a).1. Complete scraping device for the cake (2) obtained in the rotor or basket of a cycle centrifuge, of the type comprising a scraper with radial movement determined by a rotation around a shaft eccentric with respect to the axis (0 ) of the rotor and which operates such that it leaves intact a surrounding layer or "neutral layer" (2a) then removed by auxiliary means such as a squeegee capable of moving longitudinally relative to the squeegee, characterized in that that the squeegee (14) is put into action by an additional rotation of the squeegee or knife (10) capable of causing only a slight depression of the latter in the neutral layer (2 a ) and a radial displacement of the squeegee (14) such that it can eliminate all of the "neutral layer" (2 a ). 2. Dispositif suivant la revendication 1, comprenant un porte-lame os­cillant (8-9) solidaire d'un arbre basculant (3) monté excentré par rap­port à l'axe central (O) du panier, caractérisé en ce qu'il comprend un bras (12) orienté vers l'extérieur à partir du porte-lame (8-9) et qui soutient la raclette (14) dont l'arête active (14a) se trouve plus éloi­gnée du centre dudit arbre (3) que l'arête (10a) du racloir ou couteau (10) et sur un rayon décalé dans le sens de la rotation (F) du panier par rapport à celui qui passe par l'arête (10a) du racloir ou couteau (10), c'est-à-dire que l'arête active (14a) de la raclette (14) est située à l'extérieur du racloir ou couteau (10) par rapport à son arbre (3).2. Device according to claim 1, comprising an oscillating blade holder (8-9) integral with a tilting shaft (3) mounted eccentric relative to the central axis (O) of the basket, characterized in that it comprises an arm (12) facing outwardly from the blade holder (8-9) and which supports the scraper (14), the active edge (14 a) is furthest from the center of said shaft (3) the edge (10 a ) of the scraper or knife (10) and on a radius offset in the direction of rotation (F) of the basket relative to that which passes through the edge (10 a ) of the scraper or knife (10 ), that is to say that the active edge (14 a) of the squeegee (14) is located outside of the scraper or knife (10) relative to its shaft (3). 3. Dispositif suivant la revendication 2, caractérisé en ce qu'il bute contre une première butée éclipsable qui détermine la course de l'arête active (10a) du racloir ou couteau (10).3. Device according to Claim 2, characterized in that it abuts against a first retractable stop which determines the stroke of the active edge (10 a) of the scraper or knife (10). 4. Dispositif suivant la revendication 3, caractérisé en ce que son déplacement au-delà de la butée éclipsable est limité par une seconde butée qui détermine la course utile de la raclette (14).4. Device according to claim 3, characterized in that its displacement beyond the retractable stop is limited by a second stop which determines the useful stroke of the squeegee (14). 5. Dispositif suivant l'une quelconque des revendications précédentes, caractérisé en ce que le bras (12) qui porte la raclette (14) est prévu souple.5. Device according to any one of the preceding claims, characterized in that the arm (12) which carries the squeegee (14) is provided flexible. 6. Dispositif suivant l'une quelconque des revendications 1 à 4, carac­térisé en ce que la raclette (14) est constituée par au moins une lamelle souple.6. Device according to any one of claims 1 to 4, characterized in that the squeegee (14) consists of at least one flexible strip. 7. Dispositif suivant l'une quelconque des revendications 1 à 4, carac­térisé en ce que le bras (12) qui porte la raclette (14) et cette der­nière sont chacun prévus souples.7. Device according to any one of claims 1 to 4, characterized in that the arm (12) which carries the squeegee (14) and the latter are each provided flexible.
EP89420192A 1988-06-01 1989-06-01 Apparatus for completely scraping off the cake produced in controlled centrifuges Withdrawn EP0345178A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8807512A FR2632213A1 (en) 1988-06-01 1988-06-01 DEVICE FOR COMPLETELY ROTATING THE CAKE OBTAINED IN THE ROTOR OF A CYCLE CENTRIFUGE
FR8807512 1988-06-01

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EP0345178A1 true EP0345178A1 (en) 1989-12-06

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EP89420192A Withdrawn EP0345178A1 (en) 1988-06-01 1989-06-01 Apparatus for completely scraping off the cake produced in controlled centrifuges

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EP (1) EP0345178A1 (en)
JP (1) JPH0226656A (en)
FR (1) FR2632213A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6425849B1 (en) * 2001-03-27 2002-07-30 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
WO2003035267A1 (en) * 2001-10-06 2003-05-01 Guntram Krettek Wet classification device
CN111225728A (en) * 2018-05-15 2020-06-02 株式会社荒井铁工所 Shearing member and filtering device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB183028A (en) * 1921-06-23 1922-07-20 Edmund Daniels Improvements in apparatus for removing accumulation of sugar or cake from the filtering walls of centrifugal machines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB183028A (en) * 1921-06-23 1922-07-20 Edmund Daniels Improvements in apparatus for removing accumulation of sugar or cake from the filtering walls of centrifugal machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6425849B1 (en) * 2001-03-27 2002-07-30 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
US6740027B1 (en) * 2001-03-27 2004-05-25 Ronald D. Benson Solid bowl centrifuge with liquid release during rotation
WO2003035267A1 (en) * 2001-10-06 2003-05-01 Guntram Krettek Wet classification device
US7033311B2 (en) * 2001-10-06 2006-04-25 Guntram Krettek Cleaning device for drum centrifuge
CN1308089C (en) * 2001-10-06 2007-04-04 贡特拉姆·克雷泰克 Wetting sorting device
CN111225728A (en) * 2018-05-15 2020-06-02 株式会社荒井铁工所 Shearing member and filtering device

Also Published As

Publication number Publication date
JPH0226656A (en) 1990-01-29
FR2632213A1 (en) 1989-12-08

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