EP0088168B1 - Safety device for the load-engaging mechanism of nuclear combustion elements - Google Patents

Safety device for the load-engaging mechanism of nuclear combustion elements Download PDF

Info

Publication number
EP0088168B1
EP0088168B1 EP82200290A EP82200290A EP0088168B1 EP 0088168 B1 EP0088168 B1 EP 0088168B1 EP 82200290 A EP82200290 A EP 82200290A EP 82200290 A EP82200290 A EP 82200290A EP 0088168 B1 EP0088168 B1 EP 0088168B1
Authority
EP
European Patent Office
Prior art keywords
carriage
cable
load
engaging mechanism
reduction gear
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
Application number
EP82200290A
Other languages
German (de)
French (fr)
Other versions
EP0088168A3 (en
EP0088168A2 (en
Inventor
Mirko Fabris
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.)
Umicore NV SA
Original Assignee
Ateliers de Constructions Electriques de Charleroi 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 Ateliers de Constructions Electriques de Charleroi SA filed Critical Ateliers de Constructions Electriques de Charleroi SA
Priority to EP82200290A priority Critical patent/EP0088168B1/en
Priority to AT82200290T priority patent/ATE23844T1/en
Priority to DE8282200290T priority patent/DE3274447D1/en
Priority to US06/471,169 priority patent/US4623509A/en
Publication of EP0088168A2 publication Critical patent/EP0088168A2/en
Publication of EP0088168A3 publication Critical patent/EP0088168A3/en
Application granted granted Critical
Publication of EP0088168B1 publication Critical patent/EP0088168B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • B66C15/02—Safety gear for retaining load-engaging elements in the event of rope or cable breakage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
  • Control Of Combustion (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The safety device consists of doubling a first reel (4) equipped with an operating cable (11) from a carriage (24) for nuclear fuel elements is suspended, by a second reel (5) equipped with an emergency cable (12) connected with the carriage (24) and following the displacement of the carriage in a synchronous manner with the aid of a set of cog-wheels (6 and 7) joined respectively with the reels (4 and 5) by means of reducing gears (2 and 3) and connected with each other by a notched belt (8). To attenuate the impact in case of a rupture of the operating cable (11) and the loading of the emergency cable (12), the carriage (24) is equipped with an attenuating system (22) and an elastic connecting system (20).

Description

Dans les centrales nucléaires, les manipulations des éléments combustibles se font à l'aide de ponts roulants à caractéristiques parfois très différentes. Pour des raisons d'encombrement, les combustibles neufs sont généralement pris en charge par des ponts roulants équipés d'outils de préhension du type court. Par contre, le ponts roulants opérant ju dessus du réacteur, des rateliers de stockage ou de la piscine de désactivation sont équipés d'outil de préhension du type long. Un mécanisme de prise en charge, à poste fixe et muni de son propre système de levage permet à un chariot équipé d'un panier dans lequel on peut glisser un élément combustible de se déplacer verticalement dans la piscine.In nuclear power plants, the handling of fuel elements is done using overhead traveling cranes with sometimes very different characteristics. For reasons of space, new fuels are generally supported by overhead traveling cranes fitted with short type gripping tools. On the other hand, the overhead traveling cranes operating above the reactor, the storage racks or the deactivation pool are equipped with a gripping tool of the long type. A support mechanism, with a fixed position and equipped with its own lifting system, allows a trolley equipped with a basket in which one can slide a combustible element to move vertically in the pool.

Lorsqu'il est remonté dans la piscine jusqu'à un certain niveau, le chariot de ce mécanisme de prise en charge peut, par exemple, recevoir le combustible neuf amené par un outil de préhension court puis le descendre à un niveau inférieur pour permettre de reprendre cet élément combustible à l'aide d'outil de préhension long pour être ensuite véhiculé par le pont roulant ainsi équipé jusqu'à son lieu de destination.When it is raised in the pool to a certain level, the trolley of this support mechanism can, for example, receive the new fuel brought by a short gripping tool and then lower it to a lower level to allow take up this combustible element using a long gripping tool to be then transported by the crane thus equipped to its place of destination.

Pour s'adapter aux nouvelles techniques de récupération des composants encore utilisables dans des éléments combustibles avariés, il est prévu d'équiper le chariot de ce mécanisme de prise en charge à poste fixe de deux paniers pour transférer, d'un panier contenant un élément de combustible avarié, les composants encore utilisables dans l'autre panier contenant une structure d'assemblage vide.To adapt to new techniques for recovering components that can still be used in damaged fuel elements, it is planned to equip the trolley with this fixed-position support mechanism with two baskets for transferring from a basket containing an element of damaged fuel, the components still usable in the other basket containing an empty assembly structure.

Ce chariot, constamment immergé dans la piscine et relié, par un câble, à son propre système de levage, risque, à la suite de la rupture de ce câble, de s'écraser dans le fond de la piscine et d'y disperser des composants irradiés susceptibles de contaminer la piscine.This trolley, constantly submerged in the pool and connected, by a cable, to its own lifting system, risks, following the rupture of this cable, crashing into the bottom of the pool and dispersing irradiated components likely to contaminate the pool.

Le document FR-A- 2426637 décrit un mécanisme de prise en charge des éléments combustibles nucléaires selon les caractéristiques du préambule de la revendication 1. Au movement du treuil principal est associé un organe secondaire de levage dont le câble de sécurité suit constamment, de manière synchrone, le mouvement du câble principal. Cet organe secondaire de levage n'agit pas sur le mouvement du treuil principal pour autant que la tension du câble de sécurité se situe dans une plage de valeurs prédéterminées. En dehors de cette plage, l'organe secondaire s'arrête et immobilise ainsi la charge.The document FR-A-2426637 describes a mechanism for taking charge of nuclear fuel elements according to the characteristics of the preamble of claim 1. The movement of the main winch is associated with a secondary lifting member whose safety cable constantly follows, so synchronous, the movement of the main cable. This secondary lifting member does not act on the movement of the main winch provided that the tension of the safety cable is within a predetermined range of values. Outside this range, the secondary member stops and thus immobilizes the load.

La présente invention a pour but de se prémunir contre les conséquences de la rupture de ce câble en doublant de manière plus simple le dispositif de levage du chariot et en équipant le chariot d'un système d'amortissement pour atténuer les effets de choc consécutifs à la rupture du câble en service. Ce problème est résolu par les caractéristiques de la partie caractérisante de la revendication 1.The object of the present invention is to guard against the consequences of the breakage of this cable by more simply doubling the lifting device of the trolley and by equipping the trolley with a damping system to attenuate the effects of shock consecutive to cable break in service. This problem is solved by the features of the characterizing part of claim 1.

L'invention est détaillée à l'aide des figures suivantes:

  • Les figures 1, 2 et 3 représentent le dispositif du chariot.
  • Les figures 4, 5 et 6 montrent le chariot et son équipement.
  • Les figures 7, 8 et 9 schématisent des variantes
The invention is detailed using the following figures:
  • Figures 1, 2 and 3 show the device of the carriage.
  • Figures 4, 5 and 6 show the trolley and its equipment.
  • Figures 7, 8 and 9 schematize variants

La figure 1 montre un châssis sur lequel sont montés deux réducteurs 2 et 3 entraînant deux tambours 4 et 5 et actionnés par des roues dentées 6 et 7 réunies entre elles par une courrnie crantée 8. La roue dentée 6 est montée dans le prolongement de l'axe d'un moteur électrique 9 muni d'un électro-frein 10.Figure 1 shows a frame on which are mounted two reducers 2 and 3 driving two drums 4 and 5 and actuated by toothed wheels 6 and 7 joined together by a toothed belt 8. The toothed wheel 6 is mounted in the extension of the axis of an electric motor 9 provided with an electric brake 10.

Sur le tambour inférieur 4 est enroulé un câble 11 normalement en service. Le tambour supérieur 5 est porteur d'un câble de secours 12 tenu à l'écart du câble de service par un tendeur 13.On the lower drum 4 is wound a cable 11 normally in service. The upper drum 5 carries a spare cable 12 kept away from the service cable by a tensioner 13.

Le diamètre des roues dentées 6 et 7 est proportionné pour que le câble de secours 12 suive en synchronisme la charge descendue par le câble de service 11.The diameter of the toothed wheels 6 and 7 is proportioned so that the emergency cable 12 follows in synchronism the load lowered by the service cable 11.

Les réducteurs 2 et 3 sont respectivement montés sur des arbres 14 et 15 solidaires des tambours d'enroulement 4 et 5 et sont maintenus au châssis par des axes 16 et 17 sur lesquels sont montées des rotules 18 et 19 dont la bague extérieure de chacune est solidaire d'une plaque support 20 et 21 fixées respectivement aux réducteurs 2 et 3.The reducers 2 and 3 are respectively mounted on shafts 14 and 15 integral with the winding drums 4 and 5 and are held on the chassis by pins 16 and 17 on which ball joints 18 and 19 are mounted, the outer ring of each of which is integral with a support plate 20 and 21 fixed respectively to the reducers 2 and 3.

L'arbre d'entrée du réducteur 2, coaxial à l'arbre du moteur 9, est directement attaqué par le moteur 9 tandis que l'arbre, d'entrée du réducteur 3, parallèle à l'axe d'entrée du réducteur 2 est entraîné à vitesse convenable par l'intermédiaire des roues dentées 6 et 7 réunies entre elle par la courroie crantée 8.The input shaft of the reduction gear 2, coaxial with the shaft of the motor 9, is directly attacked by the motor 9 while the input shaft of the reduction gear 3, parallel to the input axis of the reduction gear 2 is driven at a suitable speed by means of the toothed wheels 6 and 7 joined together by the toothed belt 8.

Les arbres de sorties des réducteurs 2 et 3 sont orthogonaux aux arbres d'entrée et sont respectivement constitués par les arbres 14 et 15 des tambours d'enroulement 4 et 5.The output shafts of the reduction gears 2 and 3 are orthogonal to the input shafts and are respectively constituted by the shafts 14 and 15 of the winding drums 4 and 5.

Les figures 2 et 3 font apparaître une poignée de commande 22 solidarisée à une tige de commande 23 dont le rôle sera précisé ultérieurement.Figures 2 and 3 show a control handle 22 secured to a control rod 23 whose role will be explained later.

La figure 4 est une vue partielle d'un chariot 24 conçu pour recevoir deux paniers 25 disposés symétriquement par rapport à une poulie centrale 26 reprenant les brins du câble de service 1 1.Figure 4 is a partial view of a carriage 24 designed to receive two baskets 25 arranged symmetrically with respect to a central pulley 26 taking up the strands of the service cable 11.

Le chariot 24 est guidé dans son mouvement de montée et de descente par deux guides verticaux 27 sur lesquels s'appuyent des roulettes de guidage, non représentées, solidaires du chariot 24.The carriage 24 is guided in its upward and downward movement by two vertical guides 27 on which guide rollers, not shown, which are integral with the carriage 24, bear.

Le chariot 24 est muni d'un système d'amortissement 28 et d'un système de liaison élastique 29 disposés l'un et l'autre dans l'axe du câble de secours 12.The carriage 24 is provided with a damping system 28 and with an elastic connection system 29 both arranged in the axis of the emergency cable 12.

La figure 4 montre également la partie inférieure de la tige de commande 23 solidaire d'une butée d'arrêt 30 dont le rôle est de limiter vers le haut la course du chariot 24 lorsque la tige de commande 23 actionnée par la poignée de commande 22 occupe une position angulaire bien déterminée.Figure 4 also shows the lower part of the control rod 23 integral with a stopper 30 whose role is to limit upward the stroke of the carriage 24 when the control rod 23 actuated by the control handle 22 occupies an angular position well determined.

La figure 5.fait apparaître le décalage latéral créé par le tendeur 13 entre le câble de service 11 d'une part, le câble de se cours 12, le système d'amortissement 28 et le système de liaison élastique 29 d' autre part.Figure 5. shows the lateral offset created by the tensioner 13 between the service cable 11 on the one hand, the running cable 12, the damping system 28 and the elastic connection system 29 on the other hand.

La figure 6 montre la vue en plan du chariot 24.FIG. 6 shows the plan view of the carriage 24.

Le chariot 24 comporte une plaque supérieure 31 et une plaque inférieure 32 assemblées entre elles, à chaque extrémité, par deux cylindres 33 de grand diamètre et au centre par une entretoise centrale 34 servant de support à la poulie 26. Dans les cylindres 33 se glissent les paniers 25 munis chacun de deux ailes 35 s'appuyant sur la plaque supérieure 31.The carriage 24 comprises an upper plate 31 and a lower plate 32 assembled together, at each end, by two cylinders 33 of large diameter and in the center by a central spacer 34 serving to support the pulley 26. In the cylinders 33 slide the baskets 25 each provided with two wings 35 resting on the upper plate 31.

La plaque supérieure 31 et la plaque inférieure 32 sont conformées par des découpes et par des ouvertures permettant le passage des guides verticaux 27, des paniers carrés 25 et des brins du câble de service 11.The upper plate 31 and the lower plate 32 are shaped by cutouts and by openings allowing the passage of the vertical guides 27, the square baskets 25 and the strands of the service cable 11.

Le système d'amortissement 28 comporte une tige centrale 36 qui peut coulisser dans des trous 37 et 38 respectivement réalisés dans la plaque supérieure 31 et la plaque inférieure 32. Toutefois le déplacement vers le bas de la tige centrale 36 est empêchée par une butée 39, solidaire de la tige centrale 36, prenant appui sur la plaque in férieure 32 et par un disque support 40 également solidaire de la tige centrale 36 et qui prend appui sur la plaque supérieure 31, avec ou sans interposition de pièce intermédiaire. Dans la plaque inférieure 32, des trous 41 et 42 sont percés de part et d' autre du trou central 38 pour permettre à deux autres tiges 43 et 44 d'y coulisser de la même manière que la tige centrale 36. Des butées 45 et 46 solidarisées respectivement aux extrémités supérieures des tiges 43 et 44 empêchent leur déplacement vers le bas en prenant appui sur la plaque inférieure 32. Les extrémités inférieures de l'ensemble des 3 tiges parallèles 36, 43 et 44 sont filetées pour recevoir des écrous 47 servant à comprimer par l'intermediaire d'une pièce d'extrémité 48, en forme de "U", trois ressorts hélicoïdaux 49 coaxiaux aux trois tiges 36, 43 et 44 et travaillant en compression. Ces ressorts sont guidés par un jeu de cylindres 50 et 51 répartis par paires comportant chacune un cylindre de diamètre suffisamment grand pour y glisser les ressorts hélicoïdaux 49 à l'intérieur et un autre cylindre de diamètre suffisamment petit que pour y enfiler les ressorts hélicoïdaux 49 à l'extérieur.The damping system 28 comprises a central rod 36 which can slide in holes 37 and 38 respectively made in the upper plate 31 and the lower plate 32. However, the downward movement of the central rod 36 is prevented by a stop 39 , integral with the central rod 36, bearing on the lower plate 32 and by a support disc 40 also integral with the central rod 36 and which bears on the upper plate 31, with or without interposition of intermediate piece. In the lower plate 32, holes 41 and 42 are drilled on either side of the central hole 38 to allow two other rods 43 and 44 to slide there in the same manner as the central rod 36. Stops 45 and 46 secured respectively to the upper ends of the rods 43 and 44 prevent their displacement downward by bearing on the lower plate 32. The lower ends of the set of 3 parallel rods 36, 43 and 44 are threaded to receive nuts 47 serving to be compressed by means of an end piece 48, in the shape of a "U", three helical springs 49 coaxial with the three rods 36, 43 and 44 and working in compression. These springs are guided by a set of cylinders 50 and 51 distributed in pairs, each comprising a cylinder of sufficiently large diameter to slide the helical springs 49 inside and another cylinder of sufficiently small diameter to thread the helical springs 49 therein. outside.

Il est possible de régler la précontrainte des ressorts d'amortissement 49 en rapprochant plus ou moins la pièce d'extrémité 48 de la plaque inférieure 32 du chariot 24 à l'aide des écrous 47.It is possible to adjust the preload of the damping springs 49 by bringing the end piece 48 more or less close to the lower plate 32 of the carriage 24 using the nuts 47.

Le système de liaison élastique 29 est lui aussi disposé dans l'axe du câble de secours 12. Il se compose d'un cylindre 52 solidarisé à l'extrémité de la tige centrale 36 et prend appui sur la plaque supérieure 31. Dans ce cylindre 52 coulisse une tige de suspension 53 munie en bout d'un disque 54 faisant of fice de piston et servant à comprimer un ressort hélicoïdal 55 dont la compression est limitée par un tube intérieur 56.The elastic connection system 29 is also arranged in the axis of the emergency cable 12. It consists of a cylinder 52 secured to the end of the central rod 36 and bears on the upper plate 31. In this cylinder 52 slides a suspension rod 53 fitted at the end of a disc 54 acting as a piston and used to compress a helical spring 55 whose compression is limited by an inner tube 56.

La tige de suspension 53 se termine à sa partie supérieure par un attelage 57 retenant l'extrémité du câble de secours 12.The suspension rod 53 ends at its upper part by a coupling 57 retaining the end of the emergency cable 12.

Le système de liaison élastique 29 maintient le câble de secours 12 constamment sous tension e t permet de reprendre de petits écarts de synchronisme entre la vitesse de déroulement du câble de secours 12 et la vitesse de déplacement du chariot 24.The elastic connection system 29 keeps the emergency cable 12 constantly under tension and enables small differences in synchronism between the speed of unwinding of the emergency cable 12 and the speed of movement of the carriage 24 to be taken up.

En cas de rupture du câble de service 11 le mouvement de chute amorcé par le chariot 24 comprime le ressort 55 et met le cylindre intérieur 56 à butée. La charge du chariot 24 est transmise au câble de secours 12 par un cheminement d' ef forts à travers le cylindre 52, la tige centrale 36, la pièce d'extrémité 48 et les res sorts d'amortissement 49 qui se compriment à leur tour pour réduire l'effet de choc sur le câble de secours 12 en laissant coulisser vers le haut les trois tiges 36,43 et 44. Le synchronisme, existant en service, entre la vitesse de déplacement du chariot 24 et le câble de secours 12 ainsi que la tension constante du câble de secours 12 par le système de liaison élastique 29 contribue encore à réduire l'effet de choc sur le câble de secours 12 et sur les éléments combustibles contenus dans les paniers 25.In the event of a break in the service cable 11, the fall movement initiated by the carriage 24 compresses the spring 55 and puts the inner cylinder 56 at the stop. The load of the carriage 24 is transmitted to the emergency cable 12 by a path of strong forces through the cylinder 52, the central rod 36, the end piece 48 and the damping springs 49 which in turn compress to reduce the shock effect on the emergency cable 12 by sliding the three rods 36, 43 and 44 upwards. The synchronism, existing in service, between the speed of movement of the carriage 24 and the emergency cable 12 thus that the constant tension of the emergency cable 12 by the elastic connection system 29 further contributes to reducing the impact effect on the emergency cable 12 and on the combustible elements contained in the baskets 25.

Lorsque le chariot 24 sert à la manipulation de combustible irradié, il doit constamment être immergé sous une couche d'eau dont la valeur minimum est strictement réglementée. Pour respecter avec certitude ces impositions le dispositif de levage du chariot 24 est équipé d'une poignée de commande 22 permettant de positionner convenablement la butée d'arrêt 30. De la sorte, même en cas de défaillance de système d'arrêt du chariot 24 normalement prévu, la butée d'arrêt 30 permet à une came 58 fixée sur la tige de commande 23 d'actionner un interrupteur 59 coupant l'alimentation du moteur 9 et commandant le fonctionnement de l'électrofrein 10.When the carriage 24 is used for handling spent fuel, it must constantly be submerged under a layer of water, the minimum value of which is strictly regulated. In order to comply with these requirements with certainty, the lifting device of the carriage 24 is equipped with a control handle 22 making it possible to properly position the stopper 30. In this way, even in the event of failure of the stop system of the carriage 24 normally provided, the stopper 30 allows a cam 58 fixed on the control rod 23 to actuate a switch 59 cutting the power supply to the motor 9 and controlling the operation of the electric brake 10.

Avec ce dispositif de sécurité les secousses communiquées aux éléments combustibles en cas de rupture du câble de service 11 sont sans sommune mesure avec celles consécutives à une chute libre du chariot 24 jusqu'au fond de la piscine et tous risques de contamination de celle-ci sont supprimés.With this safety device, the tremors communicated to the fuel elements in the event of a break in the service cable 11 are without any measure whatsoever with those resulting from a free fall of the trolley 24 to the bottom of the pool and all risks of contamination thereof. are deleted.

D'autres exemples peuvent être realises en utilisant des moyens techniques équivalents à la courroie crantée 8 et aux roues dentées 6 et 7 pour ré aliser le synchronisme entre les tambours d'enroulement 4 et 5.Other examples can be achieved using technical means equivalent to the toothed belt 8 and the toothed wheels 6 and 7 to achieve the synchronism between the winding drums 4 and 5.

De même le moyen d'accrochage 57 du câble de secours 12 peut être remplacé par une poulie travaillant de la même manière que la poulie 26, en augmentant en conséquence la vitesse d'enroulement du câble de secours 12.Likewise, the hooking means 57 of the emergency cable 12 can be replaced by a pulley working in the same way as the pulley 26, consequently increasing the winding speed of the emergency cable 12.

Dans un autre exemple de liaison élastique, montré en figure 7 on peut utiliser un ressort hélicoïdal 55' travaillant en compression à l'intérieur d'un cylindre 56' solidaire du disque 54 pour faire butée sur le haut du cylindre 52.In another example of elastic connection, shown in FIG. 7, it is possible to use a helical spring 55 'working in compression inside a cylinder 56' integral with the disc 54 to abut on the top of the cylinder 52.

Dans un autre exemple de réalisation du système de liaison élastique 29 schématisé à la figure 8, un ressort hélicoïdal 60 peut travailler en traction à l'intérieur du cylindre 52 solidaire de la plaque supérieure 31 lorsqu'une extrémité de ce res sort 60 est fixé par une extrémité à la plaque supérieure 31 et par l'autre extrémité au disque 54 fai sant office de butée sur le haut du cylindre 52 pour limiter l'extension du ressort 60.In another embodiment of the elastic connection system 29 shown diagrammatically in FIG. 8, a helical spring 60 can work in tension inside the cylinder 52 secured to the upper plate 31 when one end of this res comes out 60 is fixed by one end to the upper plate 31 and by the other end to the disc 54 acting as a stop on the top of the cylinder 52 to limit the extension of the spring 60.

Le système d'amortissement 28 peut également être constitué de ressorts travaillant en traction. Un exemple de réalisation est montré en figure 3.The damping system 28 can also consist of springs working in traction. An exemplary embodiment is shown in FIG. 3.

La plaque supérieure 31 du chariot 24 est solidarisée à trois cylindres 61, 62, et 63. Dans chacun de ces cylindres 61, 62 et 63 coulisse respectivement une tige 64,65 et 66 dont le disque 67, 68 et 69 sert de butée pour limiter la course du ressort 70, 71, 72 dont les extrémités sont respectivement attachées à la plaque supé rieure 31 d'une part et aux disques 67, 68 et 69 d'autre part. Dans cette réalisation les tiges 64, 65 et 66 sont solidaires de la pièce d'extrémité 48' reliée elle-même à une tige 73 se rattachant soit au dispositif de liaison elastique 29 soit directement à l'attelage 57.The upper plate 31 of the carriage 24 is secured to three cylinders 61, 62, and 63. In each of these cylinders 61, 62 and 63 slides a rod 64, 65 and 66 respectively, the disc 67, 68 and 69 of which serves as a stop for limit the stroke of the spring 70, 71, 72 whose ends are respectively attached to the upper plate 31 on the one hand and to the discs 67, 68 and 69 on the other hand. In this embodiment, the rods 64, 65 and 66 are integral with the end piece 48 'which is itself connected to a rod 73 which is attached either to the elastic connection device 29 or directly to the coupling 57.

Claims (3)

1. Load-engaging mechanism for nuclear fuel elements, comprising an electric motor (9) actuating a first winding drum (4) through the agency of a first reduction gear (2) for allowing the service cable (11) to move in vertical guides (27) a carriage (24) equipped with a pulley (26) and with a basket (25) adapted to contain a nuclear fuel element, a safety device comprising a second winding drum driven by a second reduction gear (3) and carrying at least one stand-by or emergency cable (12) attached to the carriage (24), moving at the speed of the carriage (24) but not carrying the carriage (24) in normal operation, characterised in that the input shaft of the second reduction gear (3) comprises a toothed wheel (7) connected by a serrated belt (8) to another toothed wheel (6) situated on the input shaft of the first reduction gear (2), in that the carriage (24) is equipped with a second basket (25) and with an elastic connection system (29) connecting the carriage (24) to the emergency cable (12), and in that the carriage (24) is equipped with a damping system (28) elastically connecting the emergency cable (12) to at least one of the constituent plates (31 or 32) of the carriage (24).
2. Load-engaging mechanism according to the preceding claim characterised in that the elastic connection system comprises a suspension rod (53) provided at one end with a coupling (57) and at the other end with a disc (54) which slides in the interior of a cylinder (52) for deforming a helical spring (55 or 55') which is co-axial with the suspension rod (53) and whose travel is limited by an abutment (56 or 56') arranged within the cylinder (52).
3. Load-engaging mechanism according to claim 1, characterised in that the damping system (28) comprises at least one rod (36 or 65) sliding in at least one of the constituent plates (31, 32) of the carriage (24) or in an element (62) made fast to one of these plates (31) and at least one spring (49 or 71) coaxial with the said sliding rod (36 or 65) and in that one end of the spring (49 or 71) is connected to one of the two constituent plates (31 or 32) of the carriage (24) and in that the other end of the spring (49 or 71) is connected to a part (48 or 68) mounted on the end of the sliding rod (36 or 65).
EP82200290A 1982-03-08 1982-03-08 Safety device for the load-engaging mechanism of nuclear combustion elements Expired EP0088168B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP82200290A EP0088168B1 (en) 1982-03-08 1982-03-08 Safety device for the load-engaging mechanism of nuclear combustion elements
AT82200290T ATE23844T1 (en) 1982-03-08 1982-03-08 SAFETY DEVICE FOR LOAD GRIP MECHANISM OF NUCLEAR FUEL ELEMENTS.
DE8282200290T DE3274447D1 (en) 1982-03-08 1982-03-08 Safety device for the load-engaging mechanism of nuclear combustion elements
US06/471,169 US4623509A (en) 1982-03-08 1983-03-01 Safety device for a nuclear fuel element loading mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP82200290A EP0088168B1 (en) 1982-03-08 1982-03-08 Safety device for the load-engaging mechanism of nuclear combustion elements

Publications (3)

Publication Number Publication Date
EP0088168A2 EP0088168A2 (en) 1983-09-14
EP0088168A3 EP0088168A3 (en) 1984-07-18
EP0088168B1 true EP0088168B1 (en) 1986-11-26

Family

ID=8189468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82200290A Expired EP0088168B1 (en) 1982-03-08 1982-03-08 Safety device for the load-engaging mechanism of nuclear combustion elements

Country Status (4)

Country Link
US (1) US4623509A (en)
EP (1) EP0088168B1 (en)
AT (1) ATE23844T1 (en)
DE (1) DE3274447D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8729481D0 (en) * 1987-12-17 1988-02-03 British Nuclear Fuels Plc Pumps & pump handling apparatus
FR2661035B1 (en) * 1990-04-11 1992-08-14 Framatome Sa DEVICE FOR MOVING A LOAD FOLLOWING THE VERTICAL AXIS OF A WELL AND HOOD FOR HANDLING A FUEL ASSEMBLY EQUIPPED WITH SUCH A REDUCED LOAD AND MOVING DEVICE.
NO341647B1 (en) * 2015-03-12 2017-12-18 Mhwirth As Load retention system
DE202015101691U1 (en) * 2015-04-06 2015-11-10 Hager Sondermaschinenbau Gmbh Lifting axis, in particular for a gantry robot

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3090741A (en) * 1957-06-24 1963-05-21 Atomic Energy Authority Uk Manipulating machines for nuclear reactors
US3391876A (en) * 1966-10-07 1968-07-09 Herbert F. Dalglish Differential unwind or rewing apparatus
US3904048A (en) * 1968-12-02 1975-09-09 Asea Ab Device for refueling a nuclear reactor having a core comprising a plurality of fuel assemblies
US3780571A (en) * 1971-04-22 1973-12-25 Programmed & Remote Syst Corp Reactor vessel inspection device
FR2184488B1 (en) * 1972-05-18 1974-12-27 Commissariat Energie Atomique
DE2346226A1 (en) * 1973-09-13 1975-03-27 Walter Boczek ASSEMBLY DEVICE FOR NUCLEAR REACTORS
DE2408261A1 (en) * 1974-02-21 1975-09-11 Krupp Gmbh DEVICE FOR REPLACING FUEL ELEMENTS AND CONTROL STUDS IN A NUCLEAR REACTOR
GB1458115A (en) * 1974-04-25 1976-12-08 Od Polt Institut Pulley blocks
DE2436869A1 (en) * 1974-07-31 1976-02-12 Stohrer Maschinenfabrik W Slaughtered animal transport elevator - detects breakage of first derricking rope from load increase on second one
FR2338221A1 (en) * 1976-01-16 1977-08-12 Sepa Levage Sa Hoist mechanism safety device - has motor and reduction gear with extra rope kept under permanent tension
US4012002A (en) * 1976-05-19 1977-03-15 Fmc Corporation Automatic coupling mechanism for hose reels
US4053118A (en) * 1976-05-21 1977-10-11 Swing-Shift Mfg. Co. Reversible reel unit
US4113558A (en) * 1976-12-07 1978-09-12 Westinghouse Electric Corp. Nuclear fuel handling grapple carriage with self-lubricating bearing
DE2731415C3 (en) * 1977-07-12 1980-12-11 Mannesmann Ag, 4000 Duesseldorf Four rope system of a facade access device
AT356322B (en) * 1977-12-27 1980-04-25 Waagner Biro Ag CRANE LIFT FOR A ROLLER CRANE, ESPECIALLY FOR A CASTING OR REACTOR CRANE
JPS5816719B2 (en) * 1978-04-19 1983-04-01 富士電機株式会社 Stopper device for transferred fuel in nuclear reactor transfer assemblies
FR2426637A1 (en) * 1978-05-26 1979-12-21 Commissariat Energie Atomique Safety device for load lifting machines - has secondary cable to take load if primary system should fail
DE2918042C3 (en) * 1979-05-04 1981-11-19 Babcock-Brown Boveri Reaktor Gmbh, 6800 Mannheim Device for securing loads on crane systems
FR2460027A1 (en) * 1979-06-26 1981-01-16 Framatome Sa PROCESS FOR HANDLING COMBUSTIBLE ASSEMBLIES AND PENS WHEN RECHARGING A NUCLEAR REACTOR

Also Published As

Publication number Publication date
EP0088168A3 (en) 1984-07-18
EP0088168A2 (en) 1983-09-14
DE3274447D1 (en) 1987-01-15
ATE23844T1 (en) 1986-12-15
US4623509A (en) 1986-11-18

Similar Documents

Publication Publication Date Title
CA1041474A (en) Overhead crane including a single failure proof hoist
EP0147246B1 (en) Turbo engine transport stand
FR2467465A1 (en) RECHARGING MACHINE FOR A NUCLEAR REACTOR
EP0088168B1 (en) Safety device for the load-engaging mechanism of nuclear combustion elements
EP1351878B1 (en) Emergency braking device for a vehicle towed or suspended by cables and vehicle equipped with such a device
EP0138711A2 (en) Method and device for reconstruction of nuclear fuel assemblies
EP1110857B1 (en) Arrangement for stabilizing a vessel, especially in roll
FR2615500A1 (en) LOAD COMPENSATOR DEVICE FOR A HANDLING MACHINE AND METHOD FOR IMPLEMENTING SUCH COMPENSATION
US2634000A (en) Hoisting apparatus
CH664146A5 (en) Hand propelled trolley - has fork lift mounted on sliding frame actuated by electrically-driven screwed spindles
FR2848717A1 (en) Nuclear reactor guide tube handling procedure uses grab inserted through guide plates before deploying arms
EP0155217B1 (en) Safety device for load-hoisting equipment
EP1980465A1 (en) Mechanical device for guiding an overhead cable of a mechanical ski lift and method of using same
Fabris Security means for load-engaging mechanism for nuclear fuel elements
EP0003326A2 (en) Automatic apparatus for handling and screwing bolts
CN2067696U (en) Breaked steel rope protector
EP0082046B1 (en) Lifting tackles
CH682914A5 (en) Device for lifting and moving of load e.g. object - has hoist with electric motor, and lifting beam to which load is fixed, before lifting with chain connecting hoist to rail carrier
KR102492833B1 (en) Transfer vehicle apparatus
FR2699748A1 (en) Mobile adjustable support for travelling crane power supply contacts
JP3561819B2 (en) Fall prevention device for maintenance elevator in stacker crane
EP0114146A2 (en) Universal drilling apparatus equipped with means for rapid raising of the drill string
EP0463913A1 (en) Automatic handling device for several positioning or connecting elements
FR2636467A1 (en) EMERGENCY DEVICE FOR CONTROLLING THE DISPLACEMENT OF A NUCLEAR FUEL ASSEMBLY CONVEYOR TRUCK
US5219043A (en) Suspending support for a crane cab

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

17P Request for examination filed

Effective date: 19830623

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ATELIERS DE CONSTRUCTIONS ELECTRIQUES DE CHARLEROI

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 23844

Country of ref document: AT

Date of ref document: 19861215

Kind code of ref document: T

BECN Be: change of holder's name

Effective date: 19861126

REF Corresponds to:

Ref document number: 3274447

Country of ref document: DE

Date of ref document: 19870115

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO ROMA S.P.A.

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19870331

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870331

Year of fee payment: 6

Ref country code: AT

Payment date: 19870331

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Free format text: ACEC

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19890307

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890308

Ref country code: AT

Effective date: 19890308

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19890331

Ref country code: CH

Effective date: 19890331

Ref country code: BE

Effective date: 19890331

BERE Be: lapsed

Owner name: S.A. ACEC

Effective date: 19890331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19891001

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19891130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19891201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19900309

EUG Se: european patent has lapsed

Ref document number: 82200290.3

Effective date: 19910110