EP0402253A1 - Continuous single screw press with adaptable compression rate - Google Patents

Continuous single screw press with adaptable compression rate Download PDF

Info

Publication number
EP0402253A1
EP0402253A1 EP90401544A EP90401544A EP0402253A1 EP 0402253 A1 EP0402253 A1 EP 0402253A1 EP 90401544 A EP90401544 A EP 90401544A EP 90401544 A EP90401544 A EP 90401544A EP 0402253 A1 EP0402253 A1 EP 0402253A1
Authority
EP
European Patent Office
Prior art keywords
press
screw
axis
product
penetration
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Withdrawn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
EP90401544A
Other languages
German (de)
French (fr)
Inventor
Gilbert Delvincourt
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.)
LA MECANIQUE MODERNE (SA)
Original Assignee
LA MECANIQUE MODERNE (SA)
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 LA MECANIQUE MODERNE (SA) filed Critical LA MECANIQUE MODERNE (SA)
Publication of EP0402253A1 publication Critical patent/EP0402253A1/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/122—Means preventing the material from turning with the screw or returning towards the feed hopper

Definitions

  • the present invention relates to a press for mechanical extraction of a liquid phase contained in a solid, semi-pasty product or a liquid loaded with solid particles. It relates more particularly to a single-screw continuous press, the compression ratio of which is adaptable as a function of the operating parameters which are required in particular according to the product to be compressed.
  • Single screw continuous presses are well known. They consist of a cylindrical enclosure into which the product from which the liquid phase is to be extracted is introduced and of a pressure screw.
  • the cylindrical enclosure is permeable, that is to say that it has orifices, through which the extracted liquid is evacuated as it is extracted.
  • the pressure screw which is the pressure and transport device for the product, consists, along its axis of rotation, of the alternating assembly of sections of helical screw and spacing rings, which delimit in the enclosure cylindrical a succession of compression and transfer chambers.
  • the volume of the successive chambers decreases in order to obtain an increase in the pressure from one chamber to another by decreasing the volume of the corresponding chamber.
  • these spacer rings and the screw sections have different diameters.
  • Each single-screw continuous press thus constituted makes it possible to process a range of products with a more or less precise extraction rate depending on the product treated. If you want to change the operating conditions of the press, for example in the case of significantly different products, it is necessary to disassemble the pressure screw and modify the corresponding assembly of screw sections and rings d 'spacing.
  • the pins penetrating radially inside the cylindrical enclosure allow to a certain extent to modify the compression ratio of the press.
  • the applicant has sought not only to increase the compression ratio of the press, but also to modify other operating conditions, in particular the kneading effect of the product.
  • this press comprises a cylindrical enclosure permeable to liquid inside which continuously rotates a pressure screw constituted by the alternating assembly of sections of helical screw and spacing rings, delimiting successive compression chambers and for transferring the product, and at least one penetration body, penetrating inside the cylindrical enclosure.
  • the axis of the penetration body has an angular offset relative to a radial position.
  • the axis of the penetration body is in the same plane as the axis of the screw and oriented obliquely in the direction of advancement of the product in the press.
  • the axis of the penetration body is in the same plane as the axis of the screw and oriented obliquely in the opposite direction relative to the advancement of the product in the press.
  • the axis of the penetration body is in a transverse plane of the press and oriented obliquely in the direction of rotation of the screw.
  • the axis of the penetration body is in a transverse plane of the press and oriented obliquely in the opposite direction relative to the direction of rotation of the screw.
  • the first two versions concern the angular offset of the axis in the longitudinal direction of the press
  • the last two versions concern the angular offset of the axis in the transverse direction of the press. It is also possible to combine both an angular offset in the longitudinal direction and in the transverse direction.
  • the main result which is obtained thanks to the angular offset of the penetration bodies lies in the effect of product overturning and improved mixing which are due to the difference in product retention depending on the location in the body of the press. For example, if the axis of the penetration body is in the transverse plane and has an angular offset in the direction of rotation of the screw, the material which is towards the periphery will be retained more quickly by the penetration body than the material which is near the screw. This difference in retention will cause a variation in the displacement of the material and therefore in the mixing.
  • the same compression and transfer chamber comprises several penetration bodies, having the same angular offset, said bodies being distributed symmetrically around the periphery of the chamber.
  • a penetration body consists of a piston capable of sliding in leaktight manner in a housing formed in the wall of the enclosure.
  • the single-screw continuous press 1 of known type, represented in FIG. 1, comprises a permeable cylindrical enclosure 2 composed of a frame 3 furnished with an assembly of longitudinal bars 4, held spaced apart by shims not shown in the figure.
  • This assembly of bars may possibly be replaced by sectors of perforated sheet. It is by the spacings between the bars 4 or, by the perforations that the extracted liquid is discharged.
  • the pressure screw 5 is controlled in rotation by a gear motor.
  • This screw 5 is formed by the alternating assembly of spacing rings 6 and sections of helical screw 7 - seven in FIG. 1 - thus forming a discontinuous turn screw from the inlet 8 to the outlet 9 of the press 1.
  • a section 7 and the adjacent ring 6 delimit inside the enclosure 2 a chamber 15 for compression and transfer.
  • the diameters of the sections 7 increase from the inlet 8 to the outlet 9, mainly in the downstream part 10 of the press (the last four sections in FIG. 1).
  • the shapes and diameters of the rings 6 are adapted to this evolution of the sections 7.
  • the end portions 11 of the turns 12 are flush with the surface of the bars 4.
  • the available volume of the compression chambers 15 decreases from the inlet 8 to the outlet 9.
  • the comb 13 which includes teeth 14 protruding inside the enclosure 2 at the level of the spacer rings 6 and the upper end of which has the shape of the corresponding ring and is flush with the latter.
  • the operation of the press is as follows.
  • the product from which the liquid phase is to be extracted is supplied via the inlet 8, for example an oilseed from which the oil is to be extracted.
  • the product is driven into the enclosure 2 by the rotating coil 12.
  • the interruption of the turn in line with the spacer ring 6 causes an accumulation of product which is blocked in rotation by the tooth 14 of the comb 13.
  • the product stopper thus formed progresses towards the outlet 9 at each revolution of the pressure screw 5 due to the thrust of the product entrained by the coil 12.
  • the product undergoes an increase in pressure due to the decrease in the volume of the chamber 15; following this reduction in volume also has the effect of compensating for the volume of liquid extracted from the product and discharged through the orifices between the bars 4.
  • the treated product is discharged through the outlet 9.
  • Figure 2 partially shows the preferred single screw continuous press 16 according to the invention. Compared to the press 1 of the known type, it is remarkable in that the four compression and transfer chambers 17 situated towards the outlet 18 have the same theoretical interior volume, the axes 19 of the sections 20 and adjacent rings 21 having the same diameter.
  • Pistons 22,32 penetrate inside these last four chambers 17, in the zones which correspond to the spacing rings 21. They are made of special steels with high mechanical resistance to resist bending and abrasion .
  • Each piston 22, 32 is mounted to slide in a sealed manner in a housing formed through the bars 23 of the cylindrical enclosure: these are for example special bars equipped with a threaded ring.
  • the penetration height of the piston 22,32 is adjustable from the outside of the press 16.
  • the piston is provided with a screw thread cooperating with the threaded ring and the external head of the piston 22,32 is equipped with a square 24 which can be operated using a suitable key.
  • the adjustment of each piston 22, 32 must make it possible to have a zero penetration depth, in the event that the piston is to be made inactive.
  • the pistons 22, 32 have a section which is circular (fig. 3a) or rectangular (fig. 3b and 3c). As can be clearly seen in Figure 2, each piston 22,32 makes an angle, respectively 33,34 relative to the direction 31 perpendicular to the axis 29 of rotation of the pressure screw 25.
  • the piston 32 In the case of the last compression chamber of the press 16, the piston 32 is inclined towards the outlet 18 of the press 16, in the direction of advancement of the product in the press 16. In the case of the penultimate compression chamber of the press 16, the piston 22 is inclined towards the entry of the press 16, in the opposite direction to the advancement of the product in the press.
  • FIG. 3b shows a piston 27 transversely inclined, the section of which is rectangular and the long side 28 of which is parallel to the axis of rotation of the pressure screw 25.
  • FIG. 3c shows a rectangular piston 27 inclined transversely, the long side 28 of which makes an angle 30 relative to the axis of rotation of the pressure screw 25.
  • the operation of the press 16 according to the invention is identical to that which has been described above for the press 1 of known type, except that the pressure variation from one chamber 17 to the other is due not to the simple reduction in the volume of the successive chambers but to disturbances caused by the pistons 22, 32 present in the zones of accumulation of the product.
  • the presence of these pistons 22, 32 prevents the normal displacement of the accumulated product, at each turn of the screw 25; it creates pressure losses, and increases the pressure exerted on the product and consequently the compression ratio.
  • the angular offset either longitudinal as illustrated in Figure 2, or transverse as illustrated in Figure 3, creates a product flow gradient between the piston area near the bars 4 and its free end. This flow gradient causes a complementary material inversion effect.
  • the penetration body when the penetration body is not located in an area located in line with a spacer ring, but is located in an area corresponding to a section of screw, the end part of the corresponding turn is provided with a recess allowing the passage of the piston.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

The continuous single-screw press of the invention comprises a cylindrical liquid-permeable enclosure, inside which there turns a pressure screw (25) constituted by the alternate assembly of helical screw sections (20) and spacer rings (21), delimiting the successive chambers for compression and transfer of the product. In characteristic manner, it comprises at least one penetration body, for example a piston (22), which penetrates inside the cylindrical enclosure preferably in a zone situated at right angles to a spacer ring (21) and the axis of which has an angular offset in relation to a radial position. This offset can be in the longitudinal direction or in the transverse direction of the press, or a combination of these two directions. The angular offset makes it possible to improve the mixing of the product. <IMAGE>

Description

La présente invention concerne une presse d'extraction mécanique d'une phase liquide contenue dans un produit solide, semi-pâteux ou d'un liquide chargé de particules solides. Elle concerne plus particulièrement une presse continue monovis, dont le taux de compression est adaptable en fonction des paramètres de fonctionnement qui sont requis notamment selon le produit à comprimer.The present invention relates to a press for mechanical extraction of a liquid phase contained in a solid, semi-pasty product or a liquid loaded with solid particles. It relates more particularly to a single-screw continuous press, the compression ratio of which is adaptable as a function of the operating parameters which are required in particular according to the product to be compressed.

Les presses continues monovis sont bien connues. Elles sont constituées d'une enceinte cylindrique dans laquelle est introduit le produit dont on veut extraire la phase liquide et d'une vis de pression. L'enceinte cylindrique est perméable, c'est-à-dire qu'elle comporte des orifices, par lesquels le liquide extrait est évacué au fur et à mesure de son extraction. La vis de pression, qui est l'organe de pression et de transport du produit, est constituée , selon son axe de rotation, de l'assemblage alterné de tronçons de vis hélicoïdale et de bagues d'espacement, qui délimitent dans l'enceinte cylindrique une succession de chambres de compression et de transfert. Entre l'entrée de l'enceinte où est introduit le produit brut et la sortie de l'enceinte d'où est évacué le produit après extraction de la phase liquide, le volume des chambres successives va décroissant afin d'obtenir une progression de la pression d'une chambre à l'autre par diminution de volume de la chambre correspondante. Pour ce faire ces bagues d'espacement et les tronçons de vis ont des diamètres différents.Single screw continuous presses are well known. They consist of a cylindrical enclosure into which the product from which the liquid phase is to be extracted is introduced and of a pressure screw. The cylindrical enclosure is permeable, that is to say that it has orifices, through which the extracted liquid is evacuated as it is extracted. The pressure screw, which is the pressure and transport device for the product, consists, along its axis of rotation, of the alternating assembly of sections of helical screw and spacing rings, which delimit in the enclosure cylindrical a succession of compression and transfer chambers. Between the inlet of the enclosure where the raw product is introduced and the outlet of the enclosure from which the product is discharged after extraction of the liquid phase, the volume of the successive chambers decreases in order to obtain an increase in the pressure from one chamber to another by decreasing the volume of the corresponding chamber. To do this, these spacer rings and the screw sections have different diameters.

Chaque presse continue monovis ainsi constituée permet de traiter une gamme de produits avec un taux d'extraction plus ou moins précis en fonction du produit traité . Dans le cas où l'on veut modifier les conditions de fonctionnement de la presse, par exemple en cas de produits notablement différents, il est nécessaire de démonter la vis de pression et de modifier l'assemblage correspondant de tronçons de vis et de bagues d'écartement.Each single-screw continuous press thus constituted makes it possible to process a range of products with a more or less precise extraction rate depending on the product treated. If you want to change the operating conditions of the press, for example in the case of significantly different products, it is necessary to disassemble the pressure screw and modify the corresponding assembly of screw sections and rings d 'spacing.

Il est déjà connu par les documents US.A.4,361,081 et FR.A.2.494.183 d'équiper une presse continue de broches pénétrant radialement à l'intérieur de l'enceinte cylindrique, afin d'augmenter la pression de travail. De telles broches connues sont habituellement rondes, mais peuvent aussi être rectangulaires ou polygonales afin d'augmenter le défibrage. Leur profondeur de pénétration est réglable de l'extérieur, par vissage.It is already known from documents US.A.4,361,081 and FR.A.2,494,183 to equip a continuous press of spindles penetrating radially inside the cylindrical enclosure, in order to increase the working pressure. Such known pins are usually round, but can also be rectangular or polygonal in order to increase defibration. Their penetration depth is adjustable from the outside, by screwing.

Les broches pénétrant radialement à l'intérieur de l'enceinte cylindrique permettent dans une certaine mesure de modifier le taux de compression de la presse.The pins penetrating radially inside the cylindrical enclosure allow to a certain extent to modify the compression ratio of the press.

Cependant le demandeur a cherché non seulement à augmenter le taux de compression de la presse, mais également à modifier d'autres conditions de fonctionnement, notamment l'effet de malaxage du produit.However, the applicant has sought not only to increase the compression ratio of the press, but also to modify other operating conditions, in particular the kneading effect of the product.

Ceci a été obtenu dans la presse continue monovis par l'extraction de liquide d'un produit, qui fait l'objet de l'invention.This was obtained in the single-screw continuous press by the extraction of liquid from a product, which is the subject of the invention.

De manière connue, cette presse comprend une enceinte cylindrique perméable au liquide à l'intérieur de laquelle tourne continûment une vis de pression constituée de l'assemblage alterné de tronçons de vis hélicoïdale et de bagues d'espacement, délimitant des chambres successives de compression et de transfert du produit,et au moins un corps de pénétration , pénétrant à l'intérieur de l'enceinte cylindrique.In known manner, this press comprises a cylindrical enclosure permeable to liquid inside which continuously rotates a pressure screw constituted by the alternating assembly of sections of helical screw and spacing rings, delimiting successive compression chambers and for transferring the product, and at least one penetration body, penetrating inside the cylindrical enclosure.

De manière caractéristique, l'axe du corps de pénétration présente un décalage angulaire par rapport à une position radiale.Typically, the axis of the penetration body has an angular offset relative to a radial position.

Selon une première version, l'axe du corps de pénétration est dans le même plan que l'axe de la vis et orienté obliquement dans le sens de l'avancement du produit dans la presse.According to a first version, the axis of the penetration body is in the same plane as the axis of the screw and oriented obliquely in the direction of advancement of the product in the press.

Selon une deuxième version, l'axe du corps de pénétration est dans le même plan que l'axe de la vis et orienté obliquement à contre-sens par rapport à l'avancement du produit dans la presse.According to a second version, the axis of the penetration body is in the same plane as the axis of the screw and oriented obliquely in the opposite direction relative to the advancement of the product in the press.

Selon une troisième version, l'axe du corps de pénétration est dans un plan transversal de la presse et orienté obliquement dans le sens de rotation de la vis.According to a third version, the axis of the penetration body is in a transverse plane of the press and oriented obliquely in the direction of rotation of the screw.

Selon une quatrième version , l'axe du corps de pénétration est dans un plan transversal de la presse et orienté obliquement à contre-sens par rapport au sens de rotation de la vis.According to a fourth version, the axis of the penetration body is in a transverse plane of the press and oriented obliquely in the opposite direction relative to the direction of rotation of the screw.

Les deux premières versions concernent le décalage angulaire de l'axe dans le sens longitudinal de la presse, les deux dernières versions concernent le décalage angulaire de l'axe dans le sens transversal de la presse. Il est aussi possible de combiner à la fois un décalage angulaire dans le sens longitudinal et dans le sens transversal.The first two versions concern the angular offset of the axis in the longitudinal direction of the press, the last two versions concern the angular offset of the axis in the transverse direction of the press. It is also possible to combine both an angular offset in the longitudinal direction and in the transverse direction.

Le résultat principal qui est obtenu grâce au décalage angulaire des corps de pénétration réside dans l'effet de retournement du produit et de malaxage amélioré qui sont dus à la différence de retenue de produit selon l'emplacement dans le corps de la presse. Par exemple , si l'axe du corps de pénétration est dans le plan transversal et présente un décalage angulaire dans le sens de rotation de la vis , la matière qui se trouve vers la périphérie sera retenue plus rapidement par le corps de pénétration que la matière qui se trouve près de la vis. Cette différence de retenue va occasionner une variation du déplacement de la matière et donc du malaxage.The main result which is obtained thanks to the angular offset of the penetration bodies lies in the effect of product overturning and improved mixing which are due to the difference in product retention depending on the location in the body of the press. For example, if the axis of the penetration body is in the transverse plane and has an angular offset in the direction of rotation of the screw, the material which is towards the periphery will be retained more quickly by the penetration body than the material which is near the screw. This difference in retention will cause a variation in the displacement of the material and therefore in the mixing.

Le meilleur résultat est obtenu lorsque une même chambre de compression et de transfert comporte plusieurs corps de pénétration , ayant le même décalage angulaire , lesdits corps étant répartis de manière symétrique sur le pourtour de la chambre.The best result is obtained when the same compression and transfer chamber comprises several penetration bodies, having the same angular offset, said bodies being distributed symmetrically around the periphery of the chamber.

De préférence un corps de pénétration consiste en un piston apte à coulisser de manière étanche dans un logement pratiqué dans la paroi de l'enceinte.Preferably, a penetration body consists of a piston capable of sliding in leaktight manner in a housing formed in the wall of the enclosure.

L'invention sera mieux comprise à là lecture de la description qui va être faite du mode préféré de réalisation d'une presse continue monovis équipée de pistons de pénétration à décalage angulaire illustrée par le dessin annexé dans lequel :

  • La figure 1 est une vue schématique en coupe d'une presse continue monovis du type connu,
  • La figure 2 est une vue schématique partielle d'une presse continue monovis selon l'invention,
  • Les figures 3a à 3c représentent en section différents types de pistons de pénétration.
The invention will be better understood on reading the description which will be given of the preferred embodiment of a single-screw continuous press equipped with penetration pistons angular offset illustrated by the appended drawing in which:
  • FIG. 1 is a schematic sectional view of a single-screw continuous press of the known type,
  • FIG. 2 is a partial schematic view of a single-screw continuous press according to the invention,
  • Figures 3a to 3c show in section different types of penetration pistons.

La presse continue monovis 1 de type connu , représentée à la figure 1, comporte une enceinte cylindrique perméable 2 composée d'une armature 3 garnie d'un assemblage de barreaux 4 longitudinaux, tenus espacés par des cales non représentées sur la figure. Cet assemblage de barreaux peut éventuellement être remplacé par des secteurs de tôle perforée. Ce sont par les espacements entre les barreaux 4 ou, par les perforations qu'est évacué le liquide extrait.The single-screw continuous press 1 of known type, represented in FIG. 1, comprises a permeable cylindrical enclosure 2 composed of a frame 3 furnished with an assembly of longitudinal bars 4, held spaced apart by shims not shown in the figure. This assembly of bars may possibly be replaced by sectors of perforated sheet. It is by the spacings between the bars 4 or, by the perforations that the extracted liquid is discharged.

A l'intérieur de l'enceinte 2 et montée suivant l'axe de symétrie de celle-ci , la vis de pression 5 est commandée en rotation par un moto-réducteur. Cette vis 5 est constituée par l'assemblage alterné de bagues d'espacement 6 et de tronçons de vis hélicoïdale 7 - sept sur la figure 1 - formant ainsi une vis à spire discontinue depuis l'entrée 8 jusqu'à la sortie 9 de la presse 1. Un tronçon 7 et la bague 6 adjacente délimitent à l'intérieur de l'enceinte 2 une chambre 15 de compression et de transfert.Inside the enclosure 2 and mounted along the axis of symmetry thereof, the pressure screw 5 is controlled in rotation by a gear motor. This screw 5 is formed by the alternating assembly of spacing rings 6 and sections of helical screw 7 - seven in FIG. 1 - thus forming a discontinuous turn screw from the inlet 8 to the outlet 9 of the press 1. A section 7 and the adjacent ring 6 delimit inside the enclosure 2 a chamber 15 for compression and transfer.

Les diamètres des tronçons 7 vont croissants depuis l'entrée 8 jusqu'à la sortie 9 , principalement dans la partie 10 aval de la presse (les quatre derniers tronçons sur la figure 1) . Les formes et diamètres des bagues 6 sont adaptés à cette évolution des tronçons 7. Les parties extrêmes 11 des spires 12 affleurent la surface des barreaux 4.The diameters of the sections 7 increase from the inlet 8 to the outlet 9, mainly in the downstream part 10 of the press (the last four sections in FIG. 1). The shapes and diameters of the rings 6 are adapted to this evolution of the sections 7. The end portions 11 of the turns 12 are flush with the surface of the bars 4.

Comme cela apparaît clairement sur la figure 1, le volume disponible des chambres de compression 15 va décroissant depuis l'entrée 8 jusqu'à la sortie 9.As clearly appears in FIG. 1, the available volume of the compression chambers 15 decreases from the inlet 8 to the outlet 9.

Dans la partie inférieure de l'enceinte 2, entre deux lignes de barreaux 4, est monté le peigne 13 qui comporte des dents 14 dépassant à l'intérieur de l'enceinte 2 au niveau des bagues d'espacement 6 et dont l'extrémité supérieure a la forme de la bague correspondante et affleure celle-ci.In the lower part of the enclosure 2, between two lines of bars 4, is mounted the comb 13 which includes teeth 14 protruding inside the enclosure 2 at the level of the spacer rings 6 and the upper end of which has the shape of the corresponding ring and is flush with the latter.

Le fonctionnement de la presse est le suivant. On alimente par l'entrée 8 le produit dont on veut extraire la phase liquide, par exemple un oléagineux dont on veut extraire l'huile. Le produit est entraîné dans l'enceinte 2 par la spire 12 en rotation. Dans chaque chambre de compression 15, l'interruption de spire au droit de la bague d'espacement 6 provoque une accumulation de produit qui est bloqué en rotation par la dent 14 du peigne 13. Le bouchon de produit ainsi formé progresse vers la sortie 9 à chaque tour de la vis de pression 5 du fait de la poussée du produit entraîné par la spire 12. Lors de cette progression, le produit subit une augmentation de pression due à la diminution du volume de la chambre 15 ; suivante cette diminution de volume a également pour effet de compenser le volume de liquide extrait du produit et évacué par les orifices entre les barreaux 4. Le produit traite est évacué par la sortie 9.The operation of the press is as follows. The product from which the liquid phase is to be extracted is supplied via the inlet 8, for example an oilseed from which the oil is to be extracted. The product is driven into the enclosure 2 by the rotating coil 12. In each compression chamber 15, the interruption of the turn in line with the spacer ring 6 causes an accumulation of product which is blocked in rotation by the tooth 14 of the comb 13. The product stopper thus formed progresses towards the outlet 9 at each revolution of the pressure screw 5 due to the thrust of the product entrained by the coil 12. During this progression, the product undergoes an increase in pressure due to the decrease in the volume of the chamber 15; following this reduction in volume also has the effect of compensating for the volume of liquid extracted from the product and discharged through the orifices between the bars 4. The treated product is discharged through the outlet 9.

La figure 2 montre en partie la presse continue monovis 16 préférée selon l'invention. Comparativement à la presse 1 du type connu, elle est remarquable en ce que les quatre chambres 17 de compression et de transfert situées vers la sortie 18 ont le même volume intérieur théorique , les axes 19 des tronçons 20 et des bagues 21 adjacentes ayant le même diamètre.Figure 2 partially shows the preferred single screw continuous press 16 according to the invention. Compared to the press 1 of the known type, it is remarkable in that the four compression and transfer chambers 17 situated towards the outlet 18 have the same theoretical interior volume, the axes 19 of the sections 20 and adjacent rings 21 having the same diameter.

Des pistons 22,32 pénètrent à l'intérieur de ces quatre dernières chambres 17, dans les zones qui correspondent aux bagues d'espacement 21. Ils sont réalisés dans des aciers spéciaux à haute résistance mécanique pour résister à la flexion et à l'abrasion. Chaque piston 22,32 est monté coulissant de manière étanche dans un logement pratiqué à travers des barreaux 23 de l'enceinte cylindrique : il s'agit par exemple de barreaux spéciaux équipés d'une bague taraudée. La hauteur de pénétration du piston 22,32 est réglable de l'extérieur de la presse 16. Par exemple le piston est muni d'un filet de vis coopérant avec la bague taraudée et la tête extérieure du piston 22,32 est équipé d'un carré 24 manoeuvrable à l'aide d'une clé adaptée. Le réglage de chaque piston 22,32 doit permettre d'avoir une profondeur de pénétration nulle, dans le cas où l'on veut rendre le piston inactif.Pistons 22,32 penetrate inside these last four chambers 17, in the zones which correspond to the spacing rings 21. They are made of special steels with high mechanical resistance to resist bending and abrasion . Each piston 22, 32 is mounted to slide in a sealed manner in a housing formed through the bars 23 of the cylindrical enclosure: these are for example special bars equipped with a threaded ring. The penetration height of the piston 22,32 is adjustable from the outside of the press 16. For example, the piston is provided with a screw thread cooperating with the threaded ring and the external head of the piston 22,32 is equipped with a square 24 which can be operated using a suitable key. The adjustment of each piston 22, 32 must make it possible to have a zero penetration depth, in the event that the piston is to be made inactive.

Les pistons 22,32 ont une section qui est circulaire (fig.3a) ou rectangulaire (fig.3b et 3c). Comme on peut le voir clairement sur la figure 2, chaque piston 22,32 fait un certain angle, respectivement 33,34 par rapport à la direction 31 perpendiculaire à l'axe 29 de rotation de la vis de pression 25. Dans le cas de la dernière chambre de compression de la presse 16, le piston 32 est incliné vers la sortie 18 de la presse 16, dans le sens d'avancement du produit dans la presse 16. Dans le cas de l'avant-dernière chambre de compression de la presse 16, le piston 22 est incliné vers l'entrée de la presse 16, à contre-sens par rapport à l'avancement du produit dans la presse.The pistons 22, 32 have a section which is circular (fig. 3a) or rectangular (fig. 3b and 3c). As can be clearly seen in Figure 2, each piston 22,32 makes an angle, respectively 33,34 relative to the direction 31 perpendicular to the axis 29 of rotation of the pressure screw 25. In the case of the last compression chamber of the press 16, the piston 32 is inclined towards the outlet 18 of the press 16, in the direction of advancement of the product in the press 16. In the case of the penultimate compression chamber of the press 16, the piston 22 is inclined towards the entry of the press 16, in the opposite direction to the advancement of the product in the press.

On a représenté sur la figure 3b un piston 27 incliné transversalement dont la section est rectangulaire et dont le grand côté 28 est parallèle à l'axe de rotation de la vis de pression 25.FIG. 3b shows a piston 27 transversely inclined, the section of which is rectangular and the long side 28 of which is parallel to the axis of rotation of the pressure screw 25.

On a représenté sur la figure 3c un piston rectangulaire 27 incliné transversalement dont le grand côté 28 fait un certain angle 30 par rapport à l'axe de rotation de la vis de pression 25.FIG. 3c shows a rectangular piston 27 inclined transversely, the long side 28 of which makes an angle 30 relative to the axis of rotation of the pressure screw 25.

Le fonctionnement de la presse 16 selon l'invention est identique à celui qui a été décrit ci-dessus pour la presse 1 de type connu, exception faite que la variation de pression d'une chambre 17 à l'autre est due non à la simple diminution du volume des chambres successives mais aux perturbations entraînées par les pistons 22,32 présents dans les zones d'accumulation du produit. La présence de ces pistons 22,32 empêche le déplacement normal du produit accumulé, à chaque tour de la vis 25 ; elle crée des pertes de charge , et augmente la pression exercée sur le produit et en conséquence le taux de compression. De plus le décalage angulaire, soit longitudinal comme illustré sur la figure 2, soit transversal comme illustré sur la figure 3, crée un gradient d'écoulement du produit entre la zone du piston proche des barreaux 4 et son extrémité libre. Ce gradient d'écoulement provoque un effet complémentaire de retournement de la matière.The operation of the press 16 according to the invention is identical to that which has been described above for the press 1 of known type, except that the pressure variation from one chamber 17 to the other is due not to the simple reduction in the volume of the successive chambers but to disturbances caused by the pistons 22, 32 present in the zones of accumulation of the product. The presence of these pistons 22, 32 prevents the normal displacement of the accumulated product, at each turn of the screw 25; it creates pressure losses, and increases the pressure exerted on the product and consequently the compression ratio. In addition, the angular offset, either longitudinal as illustrated in Figure 2, or transverse as illustrated in Figure 3, creates a product flow gradient between the piston area near the bars 4 and its free end. This flow gradient causes a complementary material inversion effect.

Ainsi on comprend qu'il est très simple d'adapter d'une part le taux de compression de la presse 16 en réglant la profondeur de pénétration des pistons 22,32 à l'intérieur de la chambre 17 et le nombre de pistons actifs par chambre 17 et d'autre part l'effet de retournement et donc le malaxage du produit. Ceci permet d'adapter le fonctionnement de la presse 16 au produit à traiter et aussi de compenser la diminution du taux de compression due à l'usure des pièces de la presse du fait de l'abrasion.Thus we understand that it is very simple to adapt on the one hand the compression ratio of the press 16 by adjusting the penetration depth of the pistons 22,32 inside the chamber 17 and the number of active pistons by chamber 17 and on the other hand the inversion effect and therefore the kneading of the product. This makes it possible to adapt the operation of the press 16 to the product to be treated and also to compensate for the reduction in the compression ratio due to the wear of the parts of the press due to abrasion.

Il reste au constructeur à déterminer le nombre de pistons 22 par chambre 17, ceux-ci étant répartis sur la périphérie de la chambre 17 au droit de la bague 21 , et aussi leur forme et leur positionnement angulaire.It remains for the manufacturer to determine the number of pistons 22 per chamber 17, these being distributed over the periphery of the chamber 17 in line with the ring 21, and also their shape and their angular positioning.

Le meilleur malaxage a été obtenu en plaçant, dans un même tronçon de la presse 16, un certain nombre de pistons 22,32 ayant le même décalage angulaire, ces pistons étant également répartis sur toute la périphérie dudit tronçon.The best mixing has been obtained by placing, in the same section of the press 16, a number of pistons 22, 32 having the same angular offset, these pistons being also distributed over the entire periphery of said section.

L'invention n'est pas limitée au mode de réalisation préféré qui vient d'être décrit à titre d'exemple non exhaustif. Elle en couvre toutes les variantes . En particulier des barreaux spéciaux équipés de pistons peuvent être montés sur des presses continues monovis existantes, dont les tronçons de vis ont des axes de diamètre croissant, voire même sur des extrudeuses.The invention is not limited to the preferred embodiment which has just been described by way of non-exhaustive example. It covers all variants. In particular, special bars equipped with pistons can be mounted on existing single-screw continuous presses, the screw sections of which have axes of increasing diameter, or even on extruders.

Par ailleurs lorsque le corps de pénétration n'est pas situé dans une zone située au droit d'une bague d'espacement, mais est situé dans une zone correspondant à un tronçon de vis, la partie extrême de la spire correspondante est pourvue d'un évidement permettant le passage du piston.Furthermore, when the penetration body is not located in an area located in line with a spacer ring, but is located in an area corresponding to a section of screw, the end part of the corresponding turn is provided with a recess allowing the passage of the piston.

Claims (8)

1. Presse d'extraction de liquide d'un produit comprenant une enceinte cylindrique (2) perméable au liquide , à l'intérieur de laquelle tourne une vis de pression (25) constituée de l'assemblage alterné de tronçons de vis (20) hélicoïdale et de bagues d'espacement (21), délimitant les chambres successives de compression et de transfert du produit, au moins un corps de pénétration (22), pénétrant à l'intérieur de l'enceinte cylindrique caractérisée en ce que l'axe du corps (22,32) de pénétration présente un décalage angulaire par rapport à une position radiale.1. Liquid extraction press for a product comprising a cylindrical enclosure (2) permeable to liquid, inside which rotates a pressure screw (25) consisting of the alternating assembly of screw sections (20) helical and spacing rings (21), delimiting the successive compression and product transfer chambers, at least one penetration body (22), penetrating inside the cylindrical enclosure characterized in that the axis of the body (22,32) of penetration has an angular offset relative to a radial position. 2. Presse selon la revendication 1 caractérisée en ce que l'axe du corps de pénétration est dans le même plan que l'axe (29) de la vis (5) et orienté obliquement dans le sens de l'avancement du produit dans la presse (16).2. Press according to claim 1 characterized in that the axis of the penetration body is in the same plane as the axis (29) of the screw (5) and oriented obliquely in the direction of advancement of the product in the press (16). 3. Presse selon la revendication 1 caractérisée en ce que l'axe du corps de pénétration est dans le même plan que l'axe (29) de la vis (5) et orienté obliquement à contre-sens par rapport à l'avancement du produit dans la presse (16).3. Press according to claim 1 characterized in that the axis of the penetration body is in the same plane as the axis (29) of the screw (5) and oriented obliquely in the opposite direction relative to the advancement of the produced in the press (16). 4. Presse selon la revendication 1 caractérisée en ce que l'axe du corps de pénétration est dans un plan transversal de la presse (16) et orienté obliquement dans le sens de rotation de la vis (5).4. Press according to claim 1 characterized in that the axis of the penetration body is in a transverse plane of the press (16) and oriented obliquely in the direction of rotation of the screw (5). 5. Presse selon la revendication 1 caractérisée en ce que l'axe du corps de pénétration est dans un plan transversal de la presse (16) et orienté obliquement à contre-sens par rapport au sens de rotation de la vis (5).5. Press according to claim 1 characterized in that the axis of the penetration body is in a transverse plane of the press (16) and oriented obliquely in the opposite direction relative to the direction of rotation of the screw (5). 6. Presse selon la revendication 1 caractérisée en ce que l'axe du corps de pénétration présente par rapport à une position radiale un décalage angulaire à la fois transversal et longitudinal.6. Press according to claim 1 characterized in that the axis of the penetration body has relative to a radial position an angular offset both transverse and longitudinal. 7. Presse selon l'une des revendications 1 à 6 caractérisée en ce que la même chambre de compression et de transfert comporte plusieurs corps de pénétration ayant le même décalage angulaire et également répartis sur sa périphérie.7. Press according to one of claims 1 to 6 characterized in that the same compression and transfer chamber comprises several penetration bodies having the same angular offset and also distributed over its periphery. 8. Presse selon la revendication 1 caractérisée en ce que le corps de pénétration consiste en un piston (22,32) apte a coulisser de manière étanche dans un logement pratiqué dans la paroi de l'enceinte.8. Press according to claim 1 characterized in that the penetration body consists of a piston (22,32) capable of sliding in a sealed manner in a housing formed in the wall of the enclosure.
EP90401544A 1989-06-07 1990-06-07 Continuous single screw press with adaptable compression rate Withdrawn EP0402253A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8907826A FR2648261B1 (en) 1989-06-07 1989-06-07 MONOVIS CONTINUOUS PRESS WITH ADAPTABLE COMPRESSION RATE
FR8907826 1989-06-07

Publications (1)

Publication Number Publication Date
EP0402253A1 true EP0402253A1 (en) 1990-12-12

Family

ID=9382678

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90401544A Withdrawn EP0402253A1 (en) 1989-06-07 1990-06-07 Continuous single screw press with adaptable compression rate

Country Status (2)

Country Link
EP (1) EP0402253A1 (en)
FR (1) FR2648261B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0700639A1 (en) * 1994-09-12 1996-03-13 Les Innovations Mecaniques Alimentaires Device for the mechanical separation of a combination of meat and solid elements
WO2014037181A1 (en) * 2012-09-10 2014-03-13 Voith Patent Gmbh Screw extruder

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115946387B (en) * 2022-08-31 2023-09-15 山东圣香远生物科技股份有限公司 High-activity stevioside extraction method and application thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE161615C (en) *
DE223242C (en) *
FR2494183A1 (en) * 1980-11-15 1982-05-21 Berstorff Gmbh Masch Hermann DEVICE FOR THE MECHANICAL EXTRACTION OF LIQUID-SOLID MIXTURE LIQUID IN AN EXTRUDER
US4361081A (en) * 1980-08-11 1982-11-30 Howard James R Apparatus for processing oilseed and grain mash products
FR2576833A1 (en) * 1985-02-06 1986-08-08 Berstorff Gmbh Masch Hermann DEVICE FOR ADJUSTING HOMOGENIZATION RODS FOR AN EXTRUDER WITH HOMOGENIZATION RODS INTENDED FOR THE WORKING OF RUBBER OR SYNTHETIC THERMOPLASTIC OR EQUIVALENT MATERIALS

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178104A (en) * 1972-07-21 1979-12-11 Uniroyal, Ag Method and apparatus for mixing viscous materials
IT8419501A0 (en) * 1983-03-23 1984-02-08 Berstorff Gmbh Masch Hermann SCREW PRESS FOR WATER EXTRACTION PRESENTING SEPARATION SLOTS FOR WATER EXTRACTION IN WHICH VERY HIGH DRY MATERIAL CONTENTS ARE OBTAINED THROUGH A PRESSURE OF UP TO 500 BAR.
DE3506424C1 (en) * 1985-02-23 1986-08-21 Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover Pen adjustment device on a pen extruder for the processing of rubber or thermoplastic materials

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE161615C (en) *
DE223242C (en) *
US4361081A (en) * 1980-08-11 1982-11-30 Howard James R Apparatus for processing oilseed and grain mash products
FR2494183A1 (en) * 1980-11-15 1982-05-21 Berstorff Gmbh Masch Hermann DEVICE FOR THE MECHANICAL EXTRACTION OF LIQUID-SOLID MIXTURE LIQUID IN AN EXTRUDER
FR2576833A1 (en) * 1985-02-06 1986-08-08 Berstorff Gmbh Masch Hermann DEVICE FOR ADJUSTING HOMOGENIZATION RODS FOR AN EXTRUDER WITH HOMOGENIZATION RODS INTENDED FOR THE WORKING OF RUBBER OR SYNTHETIC THERMOPLASTIC OR EQUIVALENT MATERIALS

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0700639A1 (en) * 1994-09-12 1996-03-13 Les Innovations Mecaniques Alimentaires Device for the mechanical separation of a combination of meat and solid elements
FR2724293A1 (en) * 1994-09-12 1996-03-15 Innovations Mec Aliment Sarl DEVICE FOR SEPARATING MECHANICALLY THE CONSTITUENTS OF A SET COMPRISING SOLID ELEMENTS AND FLESH
WO2014037181A1 (en) * 2012-09-10 2014-03-13 Voith Patent Gmbh Screw extruder

Also Published As

Publication number Publication date
FR2648261B1 (en) 1992-04-17
FR2648261A1 (en) 1990-12-14

Similar Documents

Publication Publication Date Title
FR2484190A1 (en) HERB CUTTING MACHINE
CH433194A (en) Continuous automatic cleaning multicellular mechanical filtration device for liquids under pressure
FR2610542A1 (en) CENTRIFUGAL SEPARATOR
FR2519381A1 (en) PERISTALTIC PUMP
EP0402253A1 (en) Continuous single screw press with adaptable compression rate
CA1193903A (en) Method and pressurized device for extracting liquid
CH619640A5 (en)
FR2580760A1 (en) METHOD AND DEVICE FOR REDUCING THE RADIAL OPERATION SET BETWEEN TWO PARTS ENGAGED IN ONE ANOTHER AND ANIMATED BY ONE ROTATION MOVEMENT IN RELATION TO THE OTHER AND &#34;GAME-FREE&#34; SPEED REDUCER OBTAINED BY AID OF THIS PROCESS
EP0115457B1 (en) Sliding-calliper disc brake
EP0211706B1 (en) Process and apparatus for separating liquids and solids, in particular fruit juices
FR2543277A1 (en) PRESS RELEASE OF DEHYDRATION
FR2582985A1 (en) Reciprocating piston liquid-extracting press
EP1499493A1 (en) Wine press with cylindrical cage made of perforated stainless steel plate
FR3049212A1 (en) COMPACTOR OF PRODUCTS COMPRISING A LIQUID PHASE
FR3098263A1 (en) Assembly process AND mechanical assembly INCLUDING ROLLING BODIES SEPARATED BY INDIVIDUAL SPACERS
WO1998046357A1 (en) Improvements to crushers with ring-shaped track and roller
EP0032888A2 (en) Torque converter, acting as coupling and speed changer
FR2488534A3 (en) Multi grooved pulley wheel for driving automobile generator - is made by pressing blank into cup drilling base and deforming barrel by rolling
FR2484327A1 (en) SCREW PRESS FOR CONTINUOUS EXPULSION OF FLUID FROM VARIOUS WET MASSES
FR2510474A1 (en) Press to extract liq. from moist solids e.g. sugar beet residue - accepts continuous feed of material which is dried to 40 per cent solids
EP1530891B1 (en) Device for metering and distributing grains for a sowing machine
BE1007890A3 (en) Screen elements for rotary grinder and grinder team of such items.
EP0161192A1 (en) Adjusting method for a cross-rolling mill, and mill using this method
FR2522586A1 (en) MULTI-STAGE SCREW PRESS FILTER FOR EXTRACTING AND FILTERING SOLUBLE MATERIALS CONTAINED IN PLANT MATERIALS
BE1024594B1 (en) MONOBLOC ANNULAR BANDAGE FOR DIFFUSER

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: A1

Designated state(s): DE ES FR IT

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: 19910613