EP0577462B1 - Ball screw mounting device ensuring the operation of the closure shelves of a freeze drying chamber - Google Patents
Ball screw mounting device ensuring the operation of the closure shelves of a freeze drying chamber Download PDFInfo
- Publication number
- EP0577462B1 EP0577462B1 EP93401574A EP93401574A EP0577462B1 EP 0577462 B1 EP0577462 B1 EP 0577462B1 EP 93401574 A EP93401574 A EP 93401574A EP 93401574 A EP93401574 A EP 93401574A EP 0577462 B1 EP0577462 B1 EP 0577462B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nut
- freeze
- screw
- drying tank
- tank according
- 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.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
- F26B5/06—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum the process involving freezing
Definitions
- the invention relates to a lyophilization tank in accordance with the preamble of claim 1.
- a lyophilization tank in accordance with the preamble of claim 1.
- Such a tank is known, for example, from document FR-A-2 655 020.
- the rings, as well as the bearings, are required to withstand very great efforts and it has been found that despite the precautions taken to ensure perfect alignment of the screw in the bearings, wear was noted in particular at the level of the stainless steel rings and friction materials which hardly withstand high pressures. In addition, such a pad support is vulnerable to impurities and waste which can slip between the rings and to stress concentrations due to slight plastic deformations of the tank during the pressure / temperature cycles, rapidly causing their deterioration.
- a main object of the present invention therefore relates to a freeze-drying tank with shelves supporting bottles, at least one of the shelves being suspended from a stopper beam arranged horizontally inside and in the upper part of the tank, said beam being moved from bottom to top or from top to bottom by at least two ball screws extending vertically in the tank, said screws being in abutment at the bottom of the tank, tank according to which the lower end of each screw is engaged in a nut with zero pitch equipped with parallel grooves and horizontal intended to receive balls which cooperate with grooves provided in the screw, at least one sealing system being provided on either side of the nut to prevent the entry of impurities between the screw and said nut.
- the lower end of the screw carries a sleeve in which said grooves are provided, and the nut is housed inside two hemispherical cages resting on brackets fixed to the bottom of the tank.
- openings are provided in the nut for placing the balls in the grooves.
- the sealing system consists of sintered stainless steel rings, attached to the upper part and to the lower part of the sleeve and of the nut of the plugging beam, and held together by a flexible plastic profile seal.
- the device presented in FIG. 1 is located inside a freeze-drying tank 1 which contains a plurality of shelves 2 displaced by a plugging beam 3 bearing on at least two ball screws 4 by means of 'nuts 5.
- the screws extend vertically over the entire height of the tank, on either side of the shelves.
- the lower end of each screw 4 engages in a nut 6 with zero pitch, that is to say in a nut equipped with parallel and horizontal grooves 7 intended to receive each several balls 8 which are also housed in corresponding cylindrical grooves 9 provided in an end sleeve 10 of said screw.
- the nut 6 whose external shape is spherical and which can behave like a ball joint in order to guarantee optimal operating conditions of the bearing without parasitic stress, is housed inside two hemispherical cages (11, 12) which rest themselves on brackets 13, the assembly being fixed to the bottom of the tank by a set of screws 14.
- the sleeve 10 is made integral with the screw 4 by a key 15.
- a pin 16 provides the connection between nut 6 and the cages (11, 12).
- openings 17 (only one is shown) allowing the positioning of the balls in the grooves 7.
- the lower part of the screw 4 and of the sleeve 10 ends in a tightening bolt 18.
- a ring 19 made of sintered stainless steel is attached to the upper part as well as to the lower part of the sleeve 10, against which it is held by a seal profile 20 in flexible synthetic material.
- the crowns act as a filter for dust and impurities but can let water vapor and gas pass, which ensures the degassing of the mechanism.
- the filter 19 disposed in the lower part is located in such a way that there is no possibility of accumulation of condensates which are evacuated naturally by gravity during the steam sterilization phase.
- each ball screw at the level of the plugging beam, is shown in more detail in FIG. 3.
- the nut 5 which encloses the ball screw.
- the nut is made integral with the beam body 3 by a system of keys 22. It will be noted that there remains between the nut and the beam body, a space 23 constituting a small clearance between the screw and the beam. This clearance allows a degree of freedom in translation of one of the movable nuts 5 relative to the stopper beam, to absorb the differential expansion between said beam and the rest of the tank.
- the nut 6 with zero pitch defined above is, as can be seen, easily interchangeable.
- the nut is fitted with more or less grooves containing a plurality of balls. It acts as a crapaudine and because of the sealing means with which it is provided, it is much less sensitive to abrasion.
Description
L'invention se rapporte à une cuve de lyophilisation conformément au préambule de la revendication 1. Une telle cuve est connue, par exemple, du document FR-A-2 655 020.The invention relates to a lyophilization tank in accordance with the preamble of claim 1. Such a tank is known, for example, from document FR-A-2 655 020.
Pour éviter que les produits lyophilisés dans une cuve ne soient mis en contact avec l'air ambiant, il est bien connu de procéder au bouchage des flacons contenant les produits en question, à l'intérieur même de l'enceinte de lyophilisation. Pour cela une technique avantageuse consiste à répartir lesdits flacons sur des étagères superposées et à faire en sorte que celles-ci viennent à tour de rôle se mettre en appui sur les flacons portés par l'étagère immédiatement inférieure et enfoncer ainsi leurs bouchons, jusqu'à ce que toutes les étagères se trouvent empilées et que l'ensemble des flacons soient bouchés. On sait que pour éviter les traversées des tiges de vérins de manoeuvre dans la cuve, qui génèrent des risques de pénétration de poussières ou de produits non stériles à l'intérieur, il a été imaginé un mécanisme de manoeuvre de ces étagères qui évite tout risque de contamination. On connaît ainsi par le FR-A-2 655 020 au nom de la Demanderesse un mécanisme de bouchage de flacons répartis sur les étagères d'une cuve de lyophilisation, selon lequel au moins une des étagères est suspendue à une poutre de bouchage disposée horizontalement à l'intérieur et dans la partie supérieure de la cuve, ladite poutre étant déplacée de bas en haut ou de haut en bas par au moins deux vis à billes s'étendant verticalement dans la cuve. Un unique moteur extérieur entraîne les vis en rotation et l'étanchéité est assurée plus aisément à l'aide de manchons porte-joints.To prevent the lyophilized products in a tank from being brought into contact with the ambient air, it is well known to cap the bottles containing the products in question, inside the lyophilization enclosure itself. For this, an advantageous technique consists in distributing said bottles on superimposed shelves and in making sure that these come in turn to bear on the bottles carried by the immediately lower shelf and thus push their caps, until all the shelves are stacked and all the bottles are closed. We know that to avoid crossing the rods of actuating cylinders in the tank, which generate risks of penetration of dust or non-sterile products inside, a mechanism has been devised for operating these shelves which avoids any risk contamination. There is thus known from FR-A-2 655 020 in the name of the Applicant a mechanism for capping vials distributed on the shelves of a freeze-drying tank, according to which at least one of the shelves is suspended from a capping beam arranged horizontally inside and in the upper part of the tank, said beam being moved from bottom to top or from top to bottom by at least two ball screws extending vertically in the tank. A single external motor drives the screws in rotation and sealing is more easily ensured using seal carrier sleeves.
Ces vis à billes qui supportent le poids de la poutre de bouchage, des étagères et de leur charge, doivent être positionnées de façon très précise et maintenues solidement en appui sur le fond de la cuve. Pour cela, il est habituel jusqu'à présent de fixer à la partie inférieure de chaque vis des bagues en acier inoxydable destinées à venir en appui contre des coussinets fixes à collerette eux-mêmes portés par au moins deux supports métalliques, ancrés au fond de la cuve. Pour que les bagues, qui tournent avec la vis, glissent avec le moins de frottement possible sur les coussinets fixes, ces derniers sont avantageusement enduits, par exemple d'une poudre de céramique chargée de téflon ®.These ball screws that support the weight of the closure beam, shelves and their load, must be positioned very precisely and held firmly in abutment on the bottom of the tank. For this, it is usual until now to fix to the lower part of each screw stainless steel rings intended to come into abutment against fixed bearings with flange themselves carried by at least two metal supports, anchored at the bottom of tank. So that the rings, which turn with the screw, slide with the least possible friction on the fixed bearings, the latter are advantageously coated, for example with a ceramic powder loaded with Teflon®.
Les bagues, de même que les coussinets, sont amenés à supporter des efforts très importants et on a constaté que malgré les précautions prises pour assurer un parfait alignement de la vis dans les coussinets, une usure était constatée notamment au niveau des bagues en acier inoxydable et matériaux de friction qui supportent difficilement les fortes pressions. En outre un tel support à coussinets est vulnérable aux impuretés et déchets qui peuvent se glisser entre les bagues et aux concentrations de contraintes dues aux légères déformations plastiques de la cuve lors des cycles de pression/température, entraînant rapidement leur détérioration.The rings, as well as the bearings, are required to withstand very great efforts and it has been found that despite the precautions taken to ensure perfect alignment of the screw in the bearings, wear was noted in particular at the level of the stainless steel rings and friction materials which hardly withstand high pressures. In addition, such a pad support is vulnerable to impurities and waste which can slip between the rings and to stress concentrations due to slight plastic deformations of the tank during the pressure / temperature cycles, rapidly causing their deterioration.
Ces anomalies ont conduit la Demanderesse à rechercher un système de montage des vis à billes qui s'affranchit justement des inconvénients précités, mais qui également facilite les opérations de montage, de démontage ou d'entretien.These anomalies have led the Applicant to seek a mounting system for ball screws which precisely overcomes the aforementioned drawbacks, but which also facilitates mounting, dismantling or maintenance operations.
Un objet principal de la présente invention concerne donc une cuve de lyophilisation avec des étagères supportant des flacons, au moins une des étagères étant suspendue à une poutre de bouchage disposée horizontalement à l'intérieur et dans la partie supérieure de la cuve, ladite poutre étant déplacée de bas en haut ou de haut en bas par au moins deux vis à billes s'étendant verticalement dans la cuve, lesdites vis étant en appui au fond de la cuve, cuve selon laquelle l'extrémité inférieure de chaque vis est engagée dans un écrou à pas nul équipé de gorges parallèles et horizontales destinées à recevoir des billes qui coopèrent avec des rainures prévues dans la vis, au moins un système d'étanchéité étant prévu de part et d'autre de l'écrou pour interdire l'entrée d'impuretés entre la vis et ledit écrou.A main object of the present invention therefore relates to a freeze-drying tank with shelves supporting bottles, at least one of the shelves being suspended from a stopper beam arranged horizontally inside and in the upper part of the tank, said beam being moved from bottom to top or from top to bottom by at least two ball screws extending vertically in the tank, said screws being in abutment at the bottom of the tank, tank according to which the lower end of each screw is engaged in a nut with zero pitch equipped with parallel grooves and horizontal intended to receive balls which cooperate with grooves provided in the screw, at least one sealing system being provided on either side of the nut to prevent the entry of impurities between the screw and said nut.
Selon des modes de réalisation de l'invention, l'extrémité inférieure de la vis porte un manchon dans lequel sont prévues lesdites rainures, et l'écrou est logé à l'intérieur de deux cages hémisphériques reposant sur des potences fixées au fond de la cuve. En outre des ouvertures sont prévues dans l'écrou pour la mise en place des billes dans les gorges.According to embodiments of the invention, the lower end of the screw carries a sleeve in which said grooves are provided, and the nut is housed inside two hemispherical cages resting on brackets fixed to the bottom of the tank. In addition, openings are provided in the nut for placing the balls in the grooves.
Selon un autre mode de réalisation préféré de l'invention, le système d'étanchéité est constitué de couronnes en acier inoxydable fritté, rapportées à la partie supérieure et à la partie inférieure du manchon et de l'écrou de la poutre de bouchage, et maintenues par un joint profilé en matière synthétique souple.According to another preferred embodiment of the invention, the sealing system consists of sintered stainless steel rings, attached to the upper part and to the lower part of the sleeve and of the nut of the plugging beam, and held together by a flexible plastic profile seal.
D'autres avantages de l'invention ressortiront de la description qui va suivre d'une forme de réalisation prise à titre d'exemple non limitatif, et dans laquelle il est fait référence aux dessins annexés qui représentent.
- Figure 1, une vue schématique en coupe d'une cuve de lyophilisation
- Figure 2, une vue en coupe à plus grande échelle du montage de la partie inférieure des vis à billes
- Figure 3, une vue en coupe à plus grande échelle de l'écrou de la poutre de bouchage.
- Figure 1, a schematic sectional view of a lyophilization tank
- Figure 2, a sectional view on a larger scale of the mounting of the lower part of the ball screws
- Figure 3, a sectional view on a larger scale of the nut of the closure beam.
Le dispositif présenté sur la figure 1 se situe à l'intérieur d'une cuve de lyophilisation 1 qui renferme une pluralité d'étagères 2 déplacées par une poutre de bouchage 3 en appui sur au moins deux vis à billes 4 par l'intermédiaire d'écrous 5. Les vis s'étendent verticalement sur toute la hauteur de la cuve, de part et d'autre des étagères. On voit plus en détail à la figure 2 que l'extrémité inférieure de chaque vis 4 s'engage dans un écrou 6 à pas nul c'est-à-dire dans un écrou équipé de gorges parallèles et horizontales 7 destinées à recevoir chacune plusieurs billes 8 qui sont logées aussi dans des rainures cylindriques correspondantes 9 prévues dans un manchon d'extrémité 10 de ladite vis. L'écrou 6, dont la forme extérieure est sphérique et qui peut se comporter comme une rotule afin de garantir des conditions de fonctionnement du roulement optimales sans contrainte parasite, est logé à l'intérieur de deux cages hémisphériques (11, 12) qui reposent elles-mêmes sur des potences 13, l'ensemble étant fixé au fond de la cuve par un jeu de vis 14. Le manchon 10 est rendu solidaire de la vis 4 par une clavette 15. D'autre part un pion 16 assure la liaison entre l'écrou 6 et les cages (11, 12) . Dans l'écrou sont prévues des ouvertures 17 (une seule est représentée) permettant la mise en place des billes dans les gorges 7. La partie inférieure de la vis 4 et du manchon 10 se termine par un boulon de serrage 18. Pour éviter que des impuretés ne puissent pénétrer dans l'espace annulaire entre l'écrou et le manchon, une couronne 19 en acier inoxydable fritté est rapportée à la partie supérieure ainsi qu'à la partie inférieure du manchon 10, contre lequel elle est maintenue par un joint profilé 20 en matière synthétique souple. Les couronnes servent de filtre aux poussières et impuretés mais peuvent laisser passer la vapeur d'eau et le gaz, ce qui permet d'assurer le dégazage du mécanisme. Le filtre 19 disposé en partie basse est situé de telle manière qu'il n'y a pas de possibilité d'accumulation de condensats qui s'évacuent naturellement par gravité lors de la phase de stérilisation à la vapeur.The device presented in FIG. 1 is located inside a freeze-drying tank 1 which contains a plurality of
La partie supérieure de chaque vis à billes, au niveau de la poutre de bouchage, est montrée plus en détail à la figure 3. On y voit l'écrou 5 qui enserre la vis à billes. L'écrou est rendu solidaire du corps de poutre 3 par un système de clavettes 22. On notera qu'il subsiste entre l'écrou et le corps de poutre, un espace 23 constituant un faible jeu entre la vis et la poutre. Ce jeu autorise un degré de liberté en translation de l'un des écrous mobiles 5 par rapport à la poutre de bouchage, permettant d'absorber la dilatation différentielle entre ladite poutre et le reste de la cuve. On retrouve également sur cette figure 3, de part et d'autre de l'écrou 5 par lequel la poutre de bouchage 3 coopère avec la vis à billes 4, une couronne 19 en acier inoxydable fritté maintenue par un joint profilé 21. Le joint, par sa forme adaptée à la gorge hélicoïdale de la vis, permet d'assurer une protection malgré le mouvement relatif des divers constituants.The upper part of each ball screw, at the level of the plugging beam, is shown in more detail in FIG. 3. We see there the
L'écrou 6 à pas nul défini plus haut est comme on le voit facilement interchangeable. En fonction des dimensions de la cuve et des charges que doivent supporter les vis, l'écrou est équipé de plus ou moins de rainures renfermant une pluralité de billes. Il fait office de crapaudine et du fait des moyens d'étanchéité dont il est pourvu, il est beaucoup moins sensible à l'abrasion.The
Claims (9)
- Freeze-drying tank (1) with racks (2) supporting bottles, at least one rack being suspended to a sealing girder (3) placed horizontally inside the tank and at its upper part, said girder being displaced from bottom to top or from top to bottom by at least two ballscrews (4) which extend vertically into the tank, said screws being in support at the bottom of the tank, wherein the lower extremity of each screw (4) is engaged in a nut (6) with a nil pitch and equipped with parallel horizontal throats (7) for receiving balls (8) cooperating with grooves (9) provided in the screw, and wherein at least one imperviousness system (19, 20) is provided on both sides of the nut so as to prevent impurities penetrating between the screw and said nut.
- Freeze-drying tank according to claim 1, wherein the lower extremity of the screw (4) bears a sleeve (10) in which said grooves (9) are provided.
- Freeze-drying tank according to claim 1, wherein the nut (6) is housed inside two hemispherical cages (11, 12) resting on brackets (13) fixed to the bottom of the tank.
- Freeze-drying tank according to claim 2, wherein the sleeve (10) is rendered integral with the screw (4) by means of a key (15).
- Freeze-drying tank according to claim 3, wherein a slug (16) ensures the link between the nut (6) and the cages (11, 12).
- Freeze-drying tank according to claim 1, wherein openings (17) are provided in the nut (6) for placing the balls in the throats (7).
- Freeze-drying tank according to claims 1 and 2, wherein the imperviousness system is constituted by sintered stainless steel rings (19) mounted on the upper portion and lower portion of the sleeve (10) and supported by a profiled joint (20) made of a flexible synthetic material.
- Freeze-drying tank according to claims 1 and 7, wherein said imperviousness system (19) is mounted on both sides of the nut (5) of the sealing girder (3).
- Freeze-drying tank according to claim 3, wherein a certain amount of play is provided between the nut and the sealing girder (3), thus authorizing a degree of displacement freedom making it possible to absorb the differential cubic expansion between said girder and the rest of the tank, and wherein a joint (21) has a shape adapted to the helical throat of the screw.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR929208147A FR2693166B1 (en) | 1992-07-02 | 1992-07-02 | Device for mounting ball screws ensuring the operation of the corking shelves of a freeze-drying tank. |
| FR9208147 | 1992-07-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0577462A1 EP0577462A1 (en) | 1994-01-05 |
| EP0577462B1 true EP0577462B1 (en) | 1997-01-08 |
Family
ID=9431442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP93401574A Expired - Lifetime EP0577462B1 (en) | 1992-07-02 | 1993-06-21 | Ball screw mounting device ensuring the operation of the closure shelves of a freeze drying chamber |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5423130A (en) |
| EP (1) | EP0577462B1 (en) |
| JP (1) | JPH0754953A (en) |
| DE (1) | DE69307202T2 (en) |
| DK (1) | DK0577462T3 (en) |
| ES (1) | ES2096239T3 (en) |
| FR (1) | FR2693166B1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8393796B2 (en) * | 2010-07-29 | 2013-03-12 | Ontario Drive & Gear Limited | Heavy duty bearing support system for ATV |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191517310A (en) * | 1915-12-09 | 1916-11-23 | Edward Sydney Luard | Improvements in and relating to Means for Coupling together Shafts and other Parts. |
| US4173078A (en) * | 1978-05-16 | 1979-11-06 | The Virtis Company, Inc. | Shelf arrangement for freeze drying apparatus |
| FR2647194B1 (en) * | 1989-05-22 | 1992-12-04 | Guerin Sa Pierre | PLATE FREEZER |
| FR2655020B1 (en) * | 1989-11-30 | 1992-03-27 | Usifroid | MECHANISM FOR CAPPING BOTTLES IN A LYOPHILIZATION TANK. |
-
1992
- 1992-07-02 FR FR929208147A patent/FR2693166B1/en not_active Expired - Fee Related
-
1993
- 1993-06-18 US US08/078,085 patent/US5423130A/en not_active Expired - Fee Related
- 1993-06-21 ES ES93401574T patent/ES2096239T3/en not_active Expired - Lifetime
- 1993-06-21 EP EP93401574A patent/EP0577462B1/en not_active Expired - Lifetime
- 1993-06-21 DK DK93401574.4T patent/DK0577462T3/en active
- 1993-06-21 DE DE69307202T patent/DE69307202T2/en not_active Expired - Fee Related
- 1993-06-29 JP JP5159444A patent/JPH0754953A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0754953A (en) | 1995-02-28 |
| FR2693166B1 (en) | 1994-09-02 |
| DE69307202D1 (en) | 1997-02-20 |
| DE69307202T2 (en) | 1997-06-05 |
| DK0577462T3 (en) | 1997-06-16 |
| FR2693166A1 (en) | 1994-01-07 |
| ES2096239T3 (en) | 1997-03-01 |
| EP0577462A1 (en) | 1994-01-05 |
| US5423130A (en) | 1995-06-13 |
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