EP0935584A1 - Threaded joint spindle with adjustable clamping moment - Google Patents

Threaded joint spindle with adjustable clamping moment

Info

Publication number
EP0935584A1
EP0935584A1 EP97910492A EP97910492A EP0935584A1 EP 0935584 A1 EP0935584 A1 EP 0935584A1 EP 97910492 A EP97910492 A EP 97910492A EP 97910492 A EP97910492 A EP 97910492A EP 0935584 A1 EP0935584 A1 EP 0935584A1
Authority
EP
European Patent Office
Prior art keywords
spindle
jack
screwing
pinion
rack
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.)
Granted
Application number
EP97910492A
Other languages
German (de)
French (fr)
Other versions
EP0935584B1 (en
Inventor
André Graffin
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.)
Serac Group SAS
Original Assignee
Serac Group SAS
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 Serac Group SAS filed Critical Serac Group SAS
Publication of EP0935584A1 publication Critical patent/EP0935584A1/en
Application granted granted Critical
Publication of EP0935584B1 publication Critical patent/EP0935584B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67B—APPLYING CLOSURE MEMBERS TO BOTTLES JARS, OR SIMILAR CONTAINERS; OPENING CLOSED CONTAINERS
    • B67B3/00—Closing bottles, jars or similar containers by applying caps
    • B67B3/20—Closing bottles, jars or similar containers by applying caps by applying and rotating preformed threaded caps
    • B67B3/2073—Closing bottles, jars or similar containers by applying caps by applying and rotating preformed threaded caps comprising torque limiting means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/15—Intermittent grip type mechanical movement
    • Y10T74/1526—Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1532—Rack actuator

Definitions

  • Screwing spindle with adjustable tightening torque
  • the invention relates to a screwing spindle with adjustable tightening torque, in particular intended for the insertion by screwing of plugs on packages having threaded necks.
  • Known screwing spindles comprise an electric or pneumatic motor driving a shaft in rotation, one end of which is equipped with a plug gripping device.
  • the spindle shaft is also driven in a vertical movement allowing the plug to be brought into contact and screwed onto a threaded neck.
  • One of the concerns in relation to these pins relates to the control of the tightening torque applied to the plug. It is indeed important that this torque is large enough to ensure effective closure of the packaging and to avoid any untimely loosening of the plug closing it, without the user having to use a tool to open the packaging.
  • a torque limiting device must therefore be interposed between the motor and the spindle shaft in order to transmit a determined tightening torque.
  • a screwing spindle comprising a spindle shaft provided with a gripping device and secured to a spindle pinion driven in rotation by a jack having a rod secured to a transmission member arranged to actuate the pinion, and a pressure adjustment member disposed on a supply line to the jack in a screwing direction.
  • the tightening torque being a direct function of the force applied by the jack and this being a direct function of the supply pressure of the jack by the pressurized fluid
  • the tightening torque is determined by the supply pressure of the actuator so that it simultaneously performs the functions of the drive member and of the torque limiter.
  • the pins according to the invention are therefore simpler and less expensive than current screwing pins.
  • the transmission member comprises a rack.
  • the rack extends parallel to the longitudinal axis of the spindle shaft and the transmission member comprises a bevel gear.
  • the screw spindle according to the invention is therefore particularly compact.
  • the transmission member comprises a free wheel mounted to unidirectionally drive the gripping device in a screwing direction.
  • the jack is integral in translation with the spindle shaft. This arrangement improves the compactness of the screw spindle according to the invention.
  • the transmission member comprises a toothed wheel having a diameter greater than that of the pinion. This makes it possible to multiply the number of screwing turns of the spindle for a given stroke of the jack.
  • At least one sensor is arranged to detect a position of the rod of the jack.
  • the addition of one or more rod position sensors allows verification of the progress of the screwing operation. Indeed, a too large displacement of the rod can reveal an absence of plug, while a too small displacement, when the tightening torque is reached, can be indicative of a plug engaged obliquely on the neck of the packaging. This provides a simple and inexpensive way to ensure the quality of the screwing.
  • the screw spindle according to the invention comprises a vertical guide tube 1, the upper end of which is fixed to a spindle support 2 and which slides vertically in a sleeve 3 secured to a platform rotary 4.
  • the tube 1 rotatably receives a spindle shaft 5 whose lower end projects from the tube 1 and carries a jaw gripping device 6 actuated in a manner known per se.
  • the upper end of the spindle shaft 5 carries a bevel gear 7 cooperating with a motor assembly generally designated at 11.
  • the spindle support 2 is mounted to slide on a column 9 fixed to the rotary platform 4 and carries a roller 8 intended to cooperate with a cam (not shown) to position the support 2 and the parts associated therewith in height .
  • a support plate 10 is fixed to the side of the spindle support 2 and carries the motor assembly 11.
  • the motor assembly 11 comprises an intermediate shaft ⁇ diary 12 mounted for rotation in a bearing 13 carried by the support plate 10.
  • the shaft 12 has one end carrying, by means of a free wheel 20, a return pinion bevel 14 whose teeth are in contact with those of the pinion 7, and an opposite end carrying an input pinion 15 whose teeth are in contact with those of a rack 16.
  • the rack 16 extends vertically and is fixed by its lower end to the rod of a jack 17 with a vertical axis, the body of which is fixed to the support plate 10.
  • the jack is connected to a pressure adjusting member 21 disposed on a supply line 22 for feeding the jack 17 in a direction of screwing the plugs.
  • a support roller 18 with an axis of rotation parallel to that of the input pinion 15 is pivotally mounted at the upper end of the support plate 10 and is disposed substantially opposite the input pinion 15 on a side of the rack opposite to it so that the rack 16 is kept pressed against the input pinion 15.
  • a sensor 19 is fixed to the upper end of the support plate 10 at the extreme position of the rack 16, for a position completely extended from the rod of the jack 17.
  • the platform 4 is rotated relative to a fixed frame by a motor.
  • Packages with threaded necks are brought in and are held in line with the jaw gripping device 6 by a device not shown.
  • the support 2 and all the elements associated with it constitute a set movable in vertical translation but linked in rotation to the platform 4.
  • the vertical positioning of this movable set is ensured by the contact of the roller 8 on the cam track and therefore depends on the profile of the latter.
  • a fluid under a preset pressure by means of the pressure adjusting member 21 is brought to the jack 17.
  • the rod of the jack 17 pushes the rack 16 upwards.
  • the rack 16 rotates the input pinion 15.
  • the input pinion 15 transmits its movement to the gripping device 6 via the shaft 12, pinions 14 and 7, and the spindle shaft 5 pivoting in the guide tube 1.
  • the freewheel 20 is mounted so that the jack 17 drives the spindle shaft 5 in the direction of screwing but does not cause it to rotate when the jack 17 retracts.
  • the pinion 14 preferably has a diameter greater than the pinion 7 in order to obtain a screwing over several turns for a short stroke of the jack 17, which makes it possible to use a jack having a reduced bulk.
  • the tightening torque of the plug causes a resisting torque having a value equal to that of the motor torque resulting from the supply pressure of the jack 17, the screw spindle stops rotating and the rack 16 comes to a standstill.
  • the jack is retracted, either by a feed reversal when the jack is a double-acting jack, or by simple power cut and an elastic return in the case of a single acting cylinder.
  • the spindle shaft 5 remains stationary.
  • the jaws of the gripping device 6 can then be opened without risking scratching the plug.
  • the screw spindle is raised and the assembly is ready for a new cycle.
  • the sensor 19 is arranged at the end of the rack travel beyond the distance that the rack 16 should normally cover to achieve the number of turns necessary for capping.
  • the sensor 19 then controls the conveying of the poorly clogged packaging to a waste circuit.
  • the freewheel 20 has been illustrated between the intermediate shaft 12 and the pinion 14, this freewheel could be placed at any point of the kinematic chain connecting the jack 17 to the gripping device 6. It is also possible plan to make a kinematic chain without freewheel. In this case, it will be necessary to put the jack 17 to the exhaust without retracting it before the jaws open.
  • the rack 16 has been shown in a vertical position, it can be positioned horizontally and brought into direct contact with the pinion 7 which, in this case, is preferably a cylindrical pinion.
  • the invention could be carried out with any mechanism transforming the translational movement of the rod of the jack 17 into a rotational movement to drive the spindle shaft 5, for example a rod-crank type mechanism.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Jars (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Transmission Devices (AREA)
  • Jigs For Machine Tools (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The invention concerns a threaded joint spindle comprising a spindle shaft (5) provided with a prehensile device (6) and integral with a pinion (7) driven in rotation by a motor set (11) which comprises a cylinder (17) with a rod secured to a transmission member (12, 14, 15, 16), and a member for adjusting pressure (21) arranged on a line supplying (22) the cylinder in a screwing direction.

Description

Broche de vissage à couple de serrage réglable. Screwing spindle with adjustable tightening torque.
L'invention concerne une broche de vissage à couple de serrage réglable, notamment destinée à la mise en place par vissage de bouchons sur des emballages disposant de goulots filetés. Les broches de vissage connues comportent un moteur électrique ou pneumatique entraînant en rotation un arbre dont une extrémité est équipée d'un dispositif de préhension de bouchons. L'arbre de la broche est par ailleurs animé d'un mouvement vertical permettant la mise en contact du bouchon et le vissage sur un goulot fileté. Une des préoccupations en relation avec ces broches porte sur le contrôle du couple de serrage appliqué au bouchon. Il importe en effet que ce couple soit suffisamment important pour assurer un bouchage efficace de l'emballage et éviter tout desserrage intempestif du bouchon obturant celui-ci, sans pour autant que l'utilisateur doive recourir à un outil pour ouvrir l'emballage. Un dispositif de limitation de couple doit donc être interposé entre le moteur et l'arbre de la broche afin de transmettre un couple de serrage déterminé.The invention relates to a screwing spindle with adjustable tightening torque, in particular intended for the insertion by screwing of plugs on packages having threaded necks. Known screwing spindles comprise an electric or pneumatic motor driving a shaft in rotation, one end of which is equipped with a plug gripping device. The spindle shaft is also driven in a vertical movement allowing the plug to be brought into contact and screwed onto a threaded neck. One of the concerns in relation to these pins relates to the control of the tightening torque applied to the plug. It is indeed important that this torque is large enough to ensure effective closure of the packaging and to avoid any untimely loosening of the plug closing it, without the user having to use a tool to open the packaging. A torque limiting device must therefore be interposed between the motor and the spindle shaft in order to transmit a determined tightening torque.
On connaît, notamment des documents US 4.756.137 et EP 387.153, des dispositifs de limitation de couple à friction comportant deux plaques pressées l'une contre l'autre. Mais les frottements entre les deux plaques provoquent une usure importante de celles-ci et des échauffements modifiant leur coefficient de friction. Le couple de serrage transmis n'est donc pas constant. Il existe aussi des dispositifs de limitation de couple magnétiques ne présentant pas les inconvénients précités. Toutefois, ces dispositifs présentent également des problèmes de réglage du couple, notamment en raison du vieillissement des éléments magnétiques et, dans le cas d'aimants permanents il se produit un broutement lors du glissement . Pour obvier à ces inconvénients, on prévoit, selon l'invention une broche de vissage comportant un arbre de broche pourvu d'un dispositif de préhension et solidaire d'un pignon de broche entraîné en rotation par un vérin ayant une tige solidaire d'un organe de transmission disposé pour actionner le pignon, et un organe de réglage de pression disposé sur une ligne d'alimentation du vérin dans un sens de vissage.There are known, in particular from documents US 4,756,137 and EP 387,153, friction torque limiting devices comprising two plates pressed against each other. But the friction between the two plates causes significant wear thereof and overheating modifying their coefficient of friction. The transmitted tightening torque is therefore not constant. There are also magnetic torque limiting devices which do not have the aforementioned drawbacks. However, these devices also present problems of torque adjustment, in particular due to the aging of the magnetic elements and, in the case of permanent magnets, chattering occurs during sliding. To overcome these drawbacks, provision is made, according to the invention, for a screwing spindle comprising a spindle shaft provided with a gripping device and secured to a spindle pinion driven in rotation by a jack having a rod secured to a transmission member arranged to actuate the pinion, and a pressure adjustment member disposed on a supply line to the jack in a screwing direction.
Ainsi, le couple de serrage étant directement fonction de la force appliquée par le vérin et celle-ci étant directement fonction de la pression d'alimentation du vérin par le fluide sous pression, le couple de serrage est déterminé par la pression d'alimentation du vérin de sorte que celui-ci réalise simultanément les fonctions d'organe moteur et de limiteur de couple.Thus, the tightening torque being a direct function of the force applied by the jack and this being a direct function of the supply pressure of the jack by the pressurized fluid, the tightening torque is determined by the supply pressure of the actuator so that it simultaneously performs the functions of the drive member and of the torque limiter.
Les broches selon l'invention sont donc plus simples et moins onéreuses que les broches de vissage actuelles .The pins according to the invention are therefore simpler and less expensive than current screwing pins.
Un autre avantage de l'invention réside dans le fait que le réglage du couple de serrage de plusieurs broches d'une tourelle multibroches peut être réalisé en agissant sur un dispositif de réglage de la pression d'alimentation commun pour toutes ces broches. On évite ainsi au niveau de chaque broche une manipulation fasti- dieuse et source d'un risque d'erreur croissant avec le nombre de broches de la tourelle. Ce réglage de la pression d'alimentation peut en outre, être réalisé lorsque la tourelle est en fonctionnement. L'invention accroît ainsi la fiabilité et la rentabilité de telles tourelles. Selon un mode de réalisation avantageux de l'invention, l'organe de transmission comprend une crémaillère .Another advantage of the invention lies in the fact that the adjustment of the tightening torque of several spindles of a multi-spindle turret can be carried out by acting on a device for adjusting the supply pressure common to all these spindles. This avoids tedious handling at the level of each spindle and is a source of an increasing risk of error with the number of spindles of the turret. This adjustment of the supply pressure can also be carried out when the turret is in operation. The invention thus increases the reliability and profitability of such turrets. According to an advantageous embodiment of the invention, the transmission member comprises a rack.
Avantageusement, la crémaillère s'étend parallèlement à l'axe longitudinal de l'arbre de broche et l'organe de transmission comprend un pignon de renvoi d'angle. La broche de vissage selon l'invention est ainsi particulièrement compacte.Advantageously, the rack extends parallel to the longitudinal axis of the spindle shaft and the transmission member comprises a bevel gear. The screw spindle according to the invention is therefore particularly compact.
Selon un mode de réalisation préféré de l'inven- tion, l'organe de transmission comprend une roue libre montée pour entraîner unidirectionnellement le dispositif de préhension dans un sens de vissage. Ainsi, on peut ramener le vérin en position rétractée avant de dégager le dispositif de préhension du bouchon de sorte qu'au moment du dégagement du dispositif de préhension on est assuré que la broche n'est soumise à aucun couple et on évite ainsi d'érafler le bouchon lors de ce dégagement.According to a preferred embodiment of the invention, the transmission member comprises a free wheel mounted to unidirectionally drive the gripping device in a screwing direction. Thus, it is possible to return the jack to the retracted position before releasing the gripping device from the plug so that when the gripping device is released, it is ensured that the spindle is not subjected to any torque and this is avoided. scrape the cap during this release.
Avantageusement, le vérin est solidaire en translation de l'arbre de broche. Cette disposition améliore la compacité de la broche de vissage selon l'invention.Advantageously, the jack is integral in translation with the spindle shaft. This arrangement improves the compactness of the screw spindle according to the invention.
Selon une autre caractéristique de l'invention, l'organe de transmission comprend une roue dentée ayant un diamètre supérieur à celui du pignon. Ceci permet de multiplier le nombre de tours de vissage de la broche pour une course donnée du vérin.According to another characteristic of the invention, the transmission member comprises a toothed wheel having a diameter greater than that of the pinion. This makes it possible to multiply the number of screwing turns of the spindle for a given stroke of the jack.
Selon une version avantageuse de l'invention, au moins un capteur est disposé pour détecter une position de la tige du vérin. L'adjonction d'un ou plusieurs capteurs de position de la tige permet une vérification du déroulement de l'opération de vissage. En effet, un trop grand déplacement de la tige peut révéler une absence de bouchon, tandis qu'un trop faible déplacement, alors que le couple de serrage est atteint, peut être révélateur d'un bouchon engagé de travers sur le goulot de l'emballage. On obtient ainsi un moyen simple et peu onéreux pour s'assurer de la qualité du vissage.According to an advantageous version of the invention, at least one sensor is arranged to detect a position of the rod of the jack. The addition of one or more rod position sensors allows verification of the progress of the screwing operation. Indeed, a too large displacement of the rod can reveal an absence of plug, while a too small displacement, when the tightening torque is reached, can be indicative of a plug engaged obliquely on the neck of the packaging. This provides a simple and inexpensive way to ensure the quality of the screwing.
D'autres caractéristiques et avantages de l'in- vention apparaîtront encore à la lecture de la description qui suit d'un mode de réalisation particulier non limitatif de l'invention en relation avec la figure unique ci-jointe représentant une vue partielle en perspective d'une broche de vissage selon l'invention. En référence à la figure, la broche de vissage selon l'invention comporte un tube de guidage vertical 1, dont l'extrémité supérieure est fixée à un support de broche 2 et qui coulisse verticalement dans un manchon 3 solidaire d'une plate- forme rotative 4. Le tube 1 reçoit à rotation un arbre de broche 5 dont l'extrémité inférieure dépasse du tube 1 et porte un dispositif de préhension à mâchoires 6 actionné de façon connue en soi. L'extrémité supérieure de 1 ' arbre de broche 5 porte un pignon conique 7 coopérant avec un ensemble moteur généralement désigné en 11.Other characteristics and advantages of the invention will become apparent on reading the description which follows of a particular nonlimiting embodiment of the invention in relation to the single figure attached showing a partial perspective view of a screwing spindle according to the invention. Referring to the figure, the screw spindle according to the invention comprises a vertical guide tube 1, the upper end of which is fixed to a spindle support 2 and which slides vertically in a sleeve 3 secured to a platform rotary 4. The tube 1 rotatably receives a spindle shaft 5 whose lower end projects from the tube 1 and carries a jaw gripping device 6 actuated in a manner known per se. The upper end of the spindle shaft 5 carries a bevel gear 7 cooperating with a motor assembly generally designated at 11.
Le support de broche 2 est monté pour coulisser sur une colonne 9 fixée à la plate- forme rotative 4 et porte un galet 8 destiné à coopérer avec une came (non représentée) pour positionner en hauteur le support 2 et les pièces qui lui sont associées.The spindle support 2 is mounted to slide on a column 9 fixed to the rotary platform 4 and carries a roller 8 intended to cooperate with a cam (not shown) to position the support 2 and the parts associated therewith in height .
Une plaque support 10 est fixée sur le côté du support de broche 2 et porte l'ensemble moteur 11.A support plate 10 is fixed to the side of the spindle support 2 and carries the motor assembly 11.
L'ensemble moteur 11 comprend un arbre intermé¬ diaire 12 monté à rotation dans un palier 13 porté par la plaque support 10. L'arbre 12 a une extrémité portant, par l'intermédiaire d'une roue libre 20, un pignon de renvoi conique 14 dont les dents sont au contact de celles du pignon 7, et une extrémité opposée portant un pignon d'entrée 15 dont les dents sont au contact de celles d'une crémaillère 16. La crémaillère 16 s'étend verticalement et est fixée par son extrémité inférieure à la tige d'un vérin 17 d'axe vertical dont le corps est fixé à la plaque support 10. Le vérin est relié à un organe de réglage de pression 21 disposé sur une ligne d'alimentation 22 pour alimenter le vérin 17 dans un sens de vissage des bouchons. Un galet d'appui 18 d'axe de rotation parallèle à celui du pignon d'entrée 15 est monté pivotant à l'extrémité supérieure de la plaque support 10 et est disposé sensiblement en vis-à vis du pignon d'entrée 15 sur un côté de la crémaillère opposé à celui-ci de façon que la crémaillère 16 soit maintenue appliquée contre le pignon d'entrée 15.The motor assembly 11 comprises an intermediate shaft ¬ diary 12 mounted for rotation in a bearing 13 carried by the support plate 10. The shaft 12 has one end carrying, by means of a free wheel 20, a return pinion bevel 14 whose teeth are in contact with those of the pinion 7, and an opposite end carrying an input pinion 15 whose teeth are in contact with those of a rack 16. The rack 16 extends vertically and is fixed by its lower end to the rod of a jack 17 with a vertical axis, the body of which is fixed to the support plate 10. The jack is connected to a pressure adjusting member 21 disposed on a supply line 22 for feeding the jack 17 in a direction of screwing the plugs. A support roller 18 with an axis of rotation parallel to that of the input pinion 15 is pivotally mounted at the upper end of the support plate 10 and is disposed substantially opposite the input pinion 15 on a side of the rack opposite to it so that the rack 16 is kept pressed against the input pinion 15.
Un capteur 19 est fixé à l'extrémité supérieure de la plaque support 10 au niveau de la position extrême de la crémaillère 16, pour une position complètement sortie de la tige du vérin 17.A sensor 19 is fixed to the upper end of the support plate 10 at the extreme position of the rack 16, for a position completely extended from the rod of the jack 17.
En fonctionnement, la plate-forme 4 est entraînée en rotation par rapport à un bâti fixe par un moteur. Des emballages à goulots filetés sont amenés et sont maintenus à l'aplomb du dispositif de préhension à mâchoires 6 par un dispositif non représenté.In operation, the platform 4 is rotated relative to a fixed frame by a motor. Packages with threaded necks are brought in and are held in line with the jaw gripping device 6 by a device not shown.
Le support 2 et tous les éléments qui lui sont associés constituent un ensemble mobile en translation verticale mais lié en rotation à la plate-forme 4. Le positionnement vertical de cet ensemble mobile est assuré par le contact du galet 8 sur le chemin de came et dépend donc du profil de ce dernier.The support 2 and all the elements associated with it constitute a set movable in vertical translation but linked in rotation to the platform 4. The vertical positioning of this movable set is ensured by the contact of the roller 8 on the cam track and therefore depends on the profile of the latter.
Pendant qu'un emballage à goulot fileté est amené à l'aplomb du dispositif de préhension 6, ce dernier est actionné de façon connue en soi pour saisir un bouchon sur un distributeur non représenté. Le galet 8 suivant le profil du chemin de came du bâti provoque alors la descente de l'ensemble mobile vers le goulot fileté.While a packaging with a threaded neck is brought in line with the gripping device 6, the latter is actuated in a manner known per se to grip a plug on a dispenser not shown. The roller 8 according to the profile of the cam path of the frame then causes the mobile assembly to descend to the threaded neck.
Une fois le bouchon en contact avec le goulot fileté, un fluide sous une pression préréglée au moyen de l'organe de réglage de pression 21 est amené au vérin 17. La tige du vérin 17 pousse la crémaillère 16 vers le haut. La crémaillère 16 entraîne en rotation le pignon d'entrée 15. Le pignon d'entrée 15 transmet son mouvement au dispositif de préhension 6 par l'intermédiaire de l'arbre 12, des pignons 14 et 7, et de l'arbre de broche 5 pivotant dans le tube de guidage 1. On notera à ce propos que la roue libre 20 est montée pour que le vérin 17 entraîne l'arbre de broche 5 dans le sens du vissage mais n'entraîne pas celui-ci en rotation lorsque le vérin 17 se rétracte. Le pignon 14 a de préférence un diamètre supérieur au pignon 7 afin d'obtenir un vissage sur plusieurs tours pour une faible course du vérin 17, ce qui permet d'utiliser un vérin présentant un encombrement réduit . Lorsque le couple de serrage du bouchon provoque un couple résistant ayant une valeur égale à celle du couple moteur résultant de la pression d'alimentation du vérin 17, la broche de vissage cesse de tourner et la crémaillère 16 s'immobilise. Pour une position angulaire de la plate- forme correspondant à la fin du cycle de vissage le vérin est rétracté, soit par une inversion d'alimentation lorsque le vérin est un vérin double effet, soit par simple coupure de l'alimentation et un rappel élastique dans le cas d'un vérin simple effet. Du fait du montage en roue libre du pignon 14, l'arbre de broche 5 reste immobile. Les mâchoires du dispositif de préhension 6 peuvent alors être ouvertes sans risquer d'érafler le bouchon. La broche de vissage est relevée et l'ensemble est prêt pour un nouveau cycle . Le capteur 19 est disposé à la fin de la course de la crémaillère au-delà de la distance que la crémaillère 16 doit normalement couvrir pour réaliser le nombre de tours nécessaires pour le bouchage.Once the plug in contact with the threaded neck, a fluid under a preset pressure by means of the pressure adjusting member 21 is brought to the jack 17. The rod of the jack 17 pushes the rack 16 upwards. The rack 16 rotates the input pinion 15. The input pinion 15 transmits its movement to the gripping device 6 via the shaft 12, pinions 14 and 7, and the spindle shaft 5 pivoting in the guide tube 1. It will be noted in this connection that the freewheel 20 is mounted so that the jack 17 drives the spindle shaft 5 in the direction of screwing but does not cause it to rotate when the jack 17 retracts. The pinion 14 preferably has a diameter greater than the pinion 7 in order to obtain a screwing over several turns for a short stroke of the jack 17, which makes it possible to use a jack having a reduced bulk. When the tightening torque of the plug causes a resisting torque having a value equal to that of the motor torque resulting from the supply pressure of the jack 17, the screw spindle stops rotating and the rack 16 comes to a standstill. For an angular position of the platform corresponding to the end of the screwing cycle, the jack is retracted, either by a feed reversal when the jack is a double-acting jack, or by simple power cut and an elastic return in the case of a single acting cylinder. Due to the freewheel mounting of the pinion 14, the spindle shaft 5 remains stationary. The jaws of the gripping device 6 can then be opened without risking scratching the plug. The screw spindle is raised and the assembly is ready for a new cycle. The sensor 19 is arranged at the end of the rack travel beyond the distance that the rack 16 should normally cover to achieve the number of turns necessary for capping.
Si la crémaillère 16 est détectée par le capteur 19, cela signifie que le couple de serrage correspondant à la pression d'alimentation n'a pas été atteint en raison d'une absence de bouchon, d'un bouchon défectueux, ou d'un emballage dont le goulot est détérioré.If the rack 16 is detected by the sensor 19, this means that the tightening torque corresponding to the supply pressure has not been reached due to the absence of a plug, a defective plug, or a packaging whose neck is damaged.
Le capteur 19 commande alors le convoyage de l'emballage mal bouché vers un circuit de rebut. Lorsqu'on veut assurer le bouchage d'une nouvelle série d'emballages pour laquelle on désire un couple de serrage différent de celui utilisé précédemment, il suffit de modifier le réglage de la pression d'alimentation du vérin 17.The sensor 19 then controls the conveying of the poorly clogged packaging to a waste circuit. When it is desired to plug a new series of packagings for which a tightening torque different from that used is desired, it suffices to modify the setting of the supply pressure of the jack 17.
L'invention n'est pas limitée au mode de réalisation décrit, mais englobe également toute variante reprenant, avec des moyens équivalents, les caractéristiques essentielles de l'invention telle que définie par les revendications.The invention is not limited to the embodiment described, but also encompasses any variant incorporating, with equivalent means, the essential characteristics of the invention as defined by the claims.
En particulier, bien que la roue libre 20 ait été illustrée entre l'arbre intermédiaire 12 et le pignon 14, on pourrait disposer cette roue libre en un point quelconque de la chaîne cinématique reliant le vérin 17 au dispositif de préhension 6. On peut également prévoir de réaliser une chaîne cinématique sans roue libre. Dans ce cas, il sera nécessaire de mettre le vérin 17 à l'échappement sans le rétracter avant l'ouverture des mâchoires.In particular, although the freewheel 20 has been illustrated between the intermediate shaft 12 and the pinion 14, this freewheel could be placed at any point of the kinematic chain connecting the jack 17 to the gripping device 6. It is also possible plan to make a kinematic chain without freewheel. In this case, it will be necessary to put the jack 17 to the exhaust without retracting it before the jaws open.
Bien que la crémaillère 16 ait été représentée en position verticale, on peut la positionner horizontalement et la mettre en prise directe avec le pignon 7 qui, dans ce cas, est de préférence un pignon cylindrique.Although the rack 16 has been shown in a vertical position, it can be positioned horizontally and brought into direct contact with the pinion 7 which, in this case, is preferably a cylindrical pinion.
Bien que dans le mode de réalisation décrit, on ait utilisé une crémaillère, on pourrait réaliser l'inven- tion avec tout mécanisme transformant le mouvement de translation de la tige du vérin 17 en mouvement de rotation pour entraîner l'arbre de broche 5, par exemple un mécanisme de type bielle-manivelle. Although in the described embodiment, a rack was used, the invention could be carried out with any mechanism transforming the translational movement of the rod of the jack 17 into a rotational movement to drive the spindle shaft 5, for example a rod-crank type mechanism.

Claims

REVENDICATIONS
1. Broche de vissage comportant un arbre de broche (5) pourvu d'un dispositif de préhension (6) et solidaire d'un pignon (7) entraîné en rotation par un ensemble moteur(ll), caractérisé en ce que l'ensemble moteur (11) comprend un vérin (17) ayant une tige solidaire d'un organe de transmission (12, 14, 15, 16) disposé pour actionner le pignon, et un organe de réglage de pression1. Screw spindle comprising a spindle shaft (5) provided with a gripping device (6) and integral with a pinion (7) driven in rotation by a motor assembly (ll), characterized in that the assembly motor (11) comprises a jack (17) having a rod integral with a transmission member (12, 14, 15, 16) arranged to actuate the pinion, and a pressure adjustment member
(21) disposé sur une ligne d'alimentation (22) du vérin dans un sens de vissage.(21) disposed on a supply line (22) of the cylinder in a screwing direction.
2. Broche de vissage selon la revendication 1, caractérisée en ce qu'elle comporte une roue libre (20) montée pour entraîner unidirectionnellement le dispositif de préhension (6) dans un sens de vissage. 2. screw spindle according to claim 1, characterized in that it comprises a free wheel (20) mounted to unidirectionally drive the gripping device (6) in a screwing direction.
3. Broche de vissage selon la revendication 1, caractérisée en ce que l'organe de transmission (12, 14, 15, 16) comprend une crémaillère (16) .3. Screw spindle according to claim 1, characterized in that the transmission member (12, 14, 15, 16) comprises a rack (16).
4. Broche de vissage selon la revendication 3, caractérisée en ce que la crémaillère (16) s'étend parallè- lement à l'axe longitudinal de l'arbre de broche (5) et en ce que l'organe de transmission (12, 14, 15, 16) comporte un pignon de renvoi d'angle (14) .4. Screwing spindle according to claim 3, characterized in that the rack (16) extends parallel to the longitudinal axis of the spindle shaft (5) and in that the transmission member (12 , 14, 15, 16) has a bevel gear (14).
5. Broche de vissage selon la revendication 1, caractérisée en ce que l'arbre de broche est mobile en translation et en ce que le vérin (17) est solidaire en translation de l'arbre de broche (5) .5. Screwing spindle according to claim 1, characterized in that the spindle shaft is movable in translation and in that the jack (17) is integral in translation with the spindle shaft (5).
6. Broche de vissage selon la revendication 1, caractérisée en ce que l'organe de transmission (12, 14, 15, 16) comprend une roue dentée ayant un diamètre supé- rieur à celui du pignon.6. screw spindle according to claim 1, characterized in that the transmission member (12, 14, 15, 16) comprises a toothed wheel having a diameter greater than that of the pinion.
7. Broche de vissage selon la revendication 1, caractérisée en ce que au moins un capteur (19) est disposé pour détecter une position de la tige du vérin (17) . 7. Screwing spindle according to claim 1, characterized in that at least one sensor (19) is arranged to detect a position of the rod of the jack (17).
EP97910492A 1996-10-23 1997-10-16 Threaded joint spindle with adjustable clamping moment Expired - Lifetime EP0935584B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9612907 1996-10-23
FR9612907A FR2754750B1 (en) 1996-10-23 1996-10-23 TIGHTENING SPINDLE WITH ADJUSTABLE TIGHTENING TORQUE
PCT/FR1997/001847 WO1998017578A1 (en) 1996-10-23 1997-10-16 Threaded joint spindle with adjustable clamping moment

Publications (2)

Publication Number Publication Date
EP0935584A1 true EP0935584A1 (en) 1999-08-18
EP0935584B1 EP0935584B1 (en) 2001-02-28

Family

ID=9496929

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97910492A Expired - Lifetime EP0935584B1 (en) 1996-10-23 1997-10-16 Threaded joint spindle with adjustable clamping moment

Country Status (9)

Country Link
US (1) US5904067A (en)
EP (1) EP0935584B1 (en)
JP (1) JP3410107B2 (en)
CN (1) CN1105078C (en)
BR (1) BR9712552A (en)
DE (1) DE69704168T2 (en)
ES (1) ES2155673T3 (en)
FR (1) FR2754750B1 (en)
WO (1) WO1998017578A1 (en)

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CN103956855A (en) * 2014-05-21 2014-07-30 哈尔滨工业大学 Nut and lead screw type double-stroke electric cylinder
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Also Published As

Publication number Publication date
FR2754750A1 (en) 1998-04-24
EP0935584B1 (en) 2001-02-28
JP2000505025A (en) 2000-04-25
BR9712552A (en) 1999-10-19
CN1105078C (en) 2003-04-09
DE69704168D1 (en) 2001-04-05
WO1998017578A1 (en) 1998-04-30
CN1235590A (en) 1999-11-17
ES2155673T3 (en) 2001-05-16
DE69704168T2 (en) 2001-09-27
FR2754750B1 (en) 1998-11-27
JP3410107B2 (en) 2003-05-26
US5904067A (en) 1999-05-18

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