EP0553048A1 - Granular elevator with two skips - Google Patents

Granular elevator with two skips Download PDF

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Publication number
EP0553048A1
EP0553048A1 EP93440007A EP93440007A EP0553048A1 EP 0553048 A1 EP0553048 A1 EP 0553048A1 EP 93440007 A EP93440007 A EP 93440007A EP 93440007 A EP93440007 A EP 93440007A EP 0553048 A1 EP0553048 A1 EP 0553048A1
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EP
European Patent Office
Prior art keywords
buckets
bucket
rails
wheels
elevator according
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EP93440007A
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German (de)
French (fr)
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EP0553048B1 (en
Inventor
Albert Bingler
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MEBI PRODUCTION S.A.
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MEBI PRODUCTION SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C7/00—Controlling the operation of apparatus for producing mixtures of clay or cement with other substances; Supplying or proportioning the ingredients for mixing clay or cement with other substances; Discharging the mixture
    • B28C7/04—Supplying or proportioning the ingredients
    • B28C7/06—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors
    • B28C7/08—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips
    • B28C7/0835—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers
    • B28C7/0847—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers the skips being hoisted along vertical or inclined guides
    • B28C7/0852—Supplying the solid ingredients, e.g. by means of endless conveyors or jigging conveyors by means of scrapers or skips using skips to be hoisted along guides or to be tilted, to charge working-site concrete mixers the skips being hoisted along vertical or inclined guides and being tilted in their upmost position for discharging them at their upper side

Definitions

  • the present invention relates to an aggregate elevator comprising a frame provided with guide rails, two aggregate buckets provided with wheels which are guided by the rails on the path of each bucket between a lower position and an upper position of the bucket, flexible members traction connecting the two buckets and passing on wheels or pulleys located near or above said upper position, so that one bucket is in its upper position when the other is in its lower position, and motorized means arranged to move the buckets simultaneously and in opposite directions along the guide rails
  • Elevators of this kind are used, in particular in plants for the production of concrete or the like, for raising aggregates and dumping them in a mixer generally situated several meters above the ground, so that the product can then be discharged.
  • a construction bucket in a vehicle or in a loading hopper.
  • Conventional elevators have a single cart equipped with an opening bucket or a tilting bucket (also called “skip"), this cart being moved by means of a cable winch which pulls it up and holds it during its empty descent.
  • these movements can take place during the mixing time of a batch.
  • their duration can be critical for the productivity of the plant, if the mixing time is particularly short, as is the case in the manufacture of a serious stabilized with cement.
  • an advantageous solution consists of an elevator having two buckets connected so as to move alternately and so that their dead weights balance each other.
  • the present invention aims to create a two-bucket elevator having a simple and rigid construction and where the movement of the buckets can be done in a particularly safe manner, in particular with regard to the risk of failure.
  • an elevator of the kind indicated above characterized in that the guide rails comprise two pairs of main rails, associated respectively with the buckets and defining, for the main wheels of each bucket, two paths distinct over their entire length between the lower position and the upper position, and in that, on each side of the buckets, a main rail of one pair is fixed to the corresponding rail of the other pair at several points to form with it a rigid lateral structure forming part of the frame.
  • said rigid lateral structure comprises an upper zone and a lower zone in which the two main rails belonging to it are adjacent and are rigidly fixed to each other to form a unitary structural element in said zone.
  • said rigid lateral structure comprises a central crossing zone where the two main rails are spaced apart and are interconnected by bars forming with them a triangulated structure.
  • the guide rails may include secondary rails disposed near the lower position and the upper position for guiding a pair of secondary wheels of each bucket, which have identical locations on the two buckets.
  • the flexible traction means are formed by two chains arranged laterally relative to the buckets and passing over two toothed wheels which are integral with a common shaft.
  • the motorized means can comprise an electric geared motor group coupled to the common shaft.
  • An electric or hydraulic brake can be coupled to the common shaft.
  • the motorized means can include at least one hydraulic cylinder mechanism.
  • the motorized means can comprise a single mechanism with a hydraulic cylinder, comprising articulated arms coupled to only one of the buckets, the cylinder being double-acting to drive the said bucket in both directions of movement, while the other bucket follows displacements of the first thanks to the means of traction and its own weight.
  • the aggregate elevator comprises a first bucket 1 and a second bucket 2 which have equal capacities and which each form a carriage having two main wheels 3 and two secondary wheels 4.
  • the wheels main 3 of bucket 1 circulate along a track formed by a pair of side rails 5, while the main wheels 3 of bucket 2 circulate along another track, formed by another pair of side rails 6.
  • the main rails of the same pair are preferably formed from U-section profiles which face each other and in which the main wheels of the corresponding bucket are engaged.
  • the rails 5 and 6 on each side are arranged in the same vertical plane and form part of a rigid frame 8 comprising in particular, in the vertical plane of two main rails, a base 8a, a crutch 8b connecting the latter to rail 6, as well as cross members 8c and a diagonal 8d fixed to the two rails 5 and 6 to form with them a rigid triangulated lateral structure.
  • Cross members 8e ( Figure 4) connect the two lateral structures thus formed.
  • the secondary wheels 4 of the two buckets are arranged slightly inward relative to the rails 5 and 6 and are intended to engage in sections of lower guide rails 9 and upper 10, to properly orient the buckets 1 and 2 at the two ends. of their travel along the respective rails 5 and 6.
  • Figure 1 shows the bucket 1 in its lower end position, where it is stabilized by the engagement of its guide wheels 4 in the rails 9 and where it is ready to be filled with aggregates from a weighing hopper 11.
  • the bucket 2 is in its upper end-of-travel position, where it is tilted so as to pour its contents into a container such as a mixer 12, for example in a concrete or gravel-cement manufacturing plant.
  • the buckets 1 and 2 are connected to each other, in front of the axis of their main wheels 3, by a pair of Gall chains 14 disposed laterally relative to the buckets and passing on toothed wheels 15 integral with a transverse shaft 16 mounted at the top of the frame 8, on the upper ends of the rails 5 and 6.
  • the rotation of the shaft 16 is controlled by an electric geared group 17 comprising an electric or hydraulic brake 18. Thanks to the chain link 14, the unladen weights of the two buckets 1 and 2 balance each other, so that the gearmotor group 17 must not cause the ascent, or possibly brake when stopped, the payload of the full bucket.
  • the length of the chains 14 is such that, as shown in FIG.
  • the bucket 2 is in its upper pouring position in the mixer 12 when the bucket 1 is in its lower loading position by the hopper 11.
  • the lower end position of the bucket 2 is the same as the lower position of the bucket 1, and at the same time the bucket 1 is in an upper position similar to that of the bucket 2.
  • This identity of the positions respective of the two buckets simply results from a different positioning of the main wheels 3 of each bucket, as seen particularly in Figure 3 schematically showing a section along a vertical median plane of the elevator.
  • Dimension X represents the distance between the main rails 5 and 6 in their upper 30 and lower 31 zones, where they are superimposed and assembled to form a particularly rigid structure.
  • the axes of the wheels 3 of the two buckets are offset mutually to the same extent X, perpendicular to the bottom of each bucket.
  • the axis of the wheels 3 of bucket 1 is raised by X / 2 relative to the bottom of the bucket, while the corresponding axis of bucket 2 is offset in the same measure, but in the opposite direction, relative to the bottom of the bucket.
  • a longitudinal offset Y between these two axes, relative to the guide wheels 4 which have substantially the same location on the two buckets, to take account of the different positions of the rails 5 and 6 relative to the upper position of the buckets, as seen in Figures 1 and 2.
  • An elevator operating cycle enables the mixer 12 to be filled twice. From the state illustrated in FIG. 1, where the cup 1 is filled according to arrow A and the cup 2 is emptied according to arrow B, the gearmotor 17 is put into action to drive the chains 14 in the direction indicated by the arrows, to raise the bucket 1 and lower the bucket 2.
  • the two buckets intersect as shown in FIG. 3, their respective rails 5 and 6 having tracks which deviate to a sufficient extent.
  • the bucket 1 approaches its upper position, its guide wheels 4 engage in the guide rails 10 and cause it to tilt to empty it in the final phase of its stroke.
  • the wheels 4 of the bucket 2 engage in the lower guide rails 9 and stabilize this bucket during filling.
  • the elevator according to The invention also has remarkable advantages over the state of the art described above. Due to the absence of switches, each bucket is guided in a continuous and positive manner by fixed members throughout its travel, which eliminates the risk of derailment and allows operation free of breakdown. The internal surfaces of the rails being smooth and continuous, they do not tend to retain dust or aggregates.
  • the combination of the main rails 5 and 6 to form a rigid structure ensures better stability of each rail and better rigidity of the frame 8, without strengthening the rails or increasing their section, which is particularly advantageous for high heights. Thanks to the double chain 14 cooperating with the toothed wheels 15, there is a double safety against a possible fall of a bucket, because the brake continues to act in the event of a chain break.
  • FIG. 5 illustrates an embodiment in which the geared motor group 17 is replaced by another drive means, namely an articulated mechanism 20 actuated by a hydraulic cylinder 21 and coupled to the first bucket 1 by an articulation situated on the axis main wheels 3 or nearby.
  • the mechanism 20 is preferably of the type described in publication FR-A-2 642 410, with a rear arm 22, mounted by a joint 23 with a horizontal axis on a fixed part 24 of the frame 8, and a front arm 25 connected to the rear arm 22, to the jack 21 and to the bucket 1 by articulations with horizontal axes.
  • the cylinder is also mounted on a joint 26 with a horizontal axis. All these axes are parallel.
  • This type of mechanism has the advantage of allowing a long stroke of the bucket for a relatively small size.
  • the jack 21 is double acting, to positively drive the bucket 1 in the two directions indicated by the arrows C and D, while the bucket 2 simply follows the bucket 1 while being suspended from the chains 14.
  • the cylinder made mount bucket 1 full, following arrow C, bucket 2 descends empty by its own weight.
  • the cylinder is actuated in the opposite direction so as to pull down the empty bucket 1, according to arrow D, so that the chains 14 pull up the full bucket 2.
  • the shaft 16 then rotates freely. It can be coupled to a safety brake which activates in the event of excessive speed. However, in normal operation, there is no braking during travel, which avoids wasting energy.
  • the arrangement of the rails and the wheels of the buckets is the same as in the previous example.
  • the present invention is not limited to the examples described above, but it extends to any modification or variant obvious to a person skilled in the art.
  • the chain link 14 ensuring the combined drive of the two carriages could be replaced by a double cable winch.
  • the chains 14 could be eliminated and the double-acting mechanism 20 replaced by two mechanisms with single-acting hydraulic cylinders, each acting on a bucket and coordinated by means of hydraulic connections also allowing the dead weights to be balanced.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Types And Forms Of Lifts (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Chain Conveyers (AREA)

Abstract

The invention relates to a granulates elevator provided with two buckets (1, 2) travelling to and fro and connected by means of cables or chains (14). The two buckets (1, 2) or "skips" have the same lower and upper end-of-travel positions, but are guided by pairs of main rails (5, 6) which are separate over their entire length. These rails are fastened to one another to form an integrated rigid structure or frame (8) of the elevator. The main guide wheels (3) have different respective positions on the two buckets. Such an elevator can be used for conveying granular materials, especially in a plant for the production of concrete or cement-bound sand and gravel. <IMAGE>

Description

La présente invention concerne un élévateur à granulats comportant un bâti pourvu de rails de guidage, deux godets à granulats pourvus de roues qui sont guidées par les rails sur le parcours de chaque godet entre une position inférieure et une position supérieure du godet, des organes souples de traction reliant les deux godets et passant sur des roues ou poulies situées à proximité ou en dessus de ladite position supérieure, de sorte qu'un godet est dans sa position supérieure quand l'autre est dans sa position inférieure, et des moyens motorisés agencés pour déplacer les godets simultanément et dans des sens opposés le long des rails de guidageThe present invention relates to an aggregate elevator comprising a frame provided with guide rails, two aggregate buckets provided with wheels which are guided by the rails on the path of each bucket between a lower position and an upper position of the bucket, flexible members traction connecting the two buckets and passing on wheels or pulleys located near or above said upper position, so that one bucket is in its upper position when the other is in its lower position, and motorized means arranged to move the buckets simultaneously and in opposite directions along the guide rails

On utilise des élévateurs de ce genre, en particulier dans les centrales de fabrication de béton ou de produits analogues, pour élever des granulats et les déverser dans un malaxeur situé généralement à plusieurs mètres au-dessus du sol, afin de pouvoir déverser ensuite le produit dans une benne de chantier, dans un véhicule ou dans une trémie de chargement. Les élévateurs classiques ont un seul chariot équipé d'une benne ouvrante ou d'un godet basculant (appelé aussi "skip"), ce chariot étant déplacé au moyen d'un treuil à câble qui le tire à la montée et le retient pendant sa descente à vide. Dans la fabrication du béton, ces mouvements peuvent s'effectuer pendant le temps de malaxage d'une gâchée. Toutefois leur durée peut s'avérer critique pour la productivité de la centrale, si le temps de malaxage est particulièrement court, comme c'est le cas dans la fabrication d'une grave stabilisée au ciment. C'est alors la durée du cycle de l'élévateur à granulats, et non pas celle du malaxeur, qui détermine la cadence de production. De plus, un tel élévateur consomme beaucoup d'énergie. C'est pourquoi une solution avantageuse consiste en un élévateur ayant deux godets reliés de façon à se déplacer alternativement et de façon que leurs poids morts s'équilibrent mutuellement.Elevators of this kind are used, in particular in plants for the production of concrete or the like, for raising aggregates and dumping them in a mixer generally situated several meters above the ground, so that the product can then be discharged. in a construction bucket, in a vehicle or in a loading hopper. Conventional elevators have a single cart equipped with an opening bucket or a tilting bucket (also called "skip"), this cart being moved by means of a cable winch which pulls it up and holds it during its empty descent. In the manufacture of concrete, these movements can take place during the mixing time of a batch. However, their duration can be critical for the productivity of the plant, if the mixing time is particularly short, as is the case in the manufacture of a serious stabilized with cement. It is then the duration of the aggregate elevator cycle, and not that of the mixer, which determines the production rate. In addition, such an elevator consumes a lot of energy. This is why an advantageous solution consists of an elevator having two buckets connected so as to move alternately and so that their dead weights balance each other.

Le brevet français publié sous le numéro 1 465 168 décrit un tel élévateur, ayant deux bennes ou godets qui circulent sur une paire de rails principaux. Pour permettre le croisement des godets, le tronçon central de chaque rail principal est dédoublé en deux voies raccordées par des branchements à aiguilles définissant deux parcours différents dans cette zone, tandis que les godets suivent les mêmes parcours dans les zones supérieures et inférieures des rails, afin d'occuper les mêmes positions. Quatre aiguilles pivotantes sont prévues à chaque branchement et sont commandées par un mécanisme à bielles ayant une came mobile attaquée par une roue de chaque godet. Un tel agencement mécanique est susceptible de détériorations ou de pannes fréquentes, dans les conditions sévères d'exploitation d'un élévateur à granulats où les rails peuvent facilement recevoir des poussières ou des éléments solides s'échappant des godets. Les perturbations du fonctionnement des aiguillages causent non seulement des arrêts de l'élévateur et des pertes de productivité, mais également des risques de déraillement pouvant avoir des conséquences graves. En outre, les ouvertures ménagées dans les ailes des rails à l'emplacement des aiguilles affaiblissent les rails et nécessitent des renforcements. Les déviations des trajectoires des godets au passage des embranchements produisent des efforts qui nécessitent aussi de renforcer le bâti et les rails ou de restreindre la vitesse des godets, donc le débit horaire des granulats.The French patent published under the number 1 465 168 describes such an elevator, having two buckets or buckets which circulate on a pair of main rails. To allow the buckets to cross, the central section of each main rail is split into two tracks connected by needle connections defining two different paths in this zone, while the buckets follow the same paths in the upper and lower zones of the rails, in order to occupy the same positions. Four pivoting needles are provided for each connection and are controlled by a link mechanism having a movable cam driven by a wheel of each bucket. Such a mechanical arrangement is liable to deterioration or frequent breakdowns, under the severe operating conditions of an aggregate elevator where the rails can easily receive dust or solid elements escaping from the buckets. Disturbances in switch operations not only cause the elevator to stop and lose productivity, but also derailment risks which can have serious consequences. In addition, the openings in the wings of the rails at the location of the needles weaken the rails and require reinforcements. The deviations of the trajectories of the buckets at the passage of the branch lines produce forces which also require strengthening the frame and the rails or restricting the speed of the buckets, therefore the hourly flow of aggregates.

La présente invention a pour but de créer un élévateur à deux godets ayant une construction simple et rigide et où le déplacement des godets peut se faire d'une manière particulièrement sûre, notamment en ce qui concerne le risque de panne.The present invention aims to create a two-bucket elevator having a simple and rigid construction and where the movement of the buckets can be done in a particularly safe manner, in particular with regard to the risk of failure.

Selon l'invention, ce but est rempli par un élévateur du genre indiqué plus haut, caractérisé en ce que les rails de guidage comportent deux paires de rails principaux, associées respectivement aux godets et définissant, pour des roues principales de chaque godet, deux parcours distincts sur toute leur longueur entre la position inférieure et la position supérieure, et en ce que, de chaque côté des godets, un rail principal d'une paire est fixé au rail correspondant de l'autre paire en plusieurs points pour former avec lui une structure latérale rigide faisant partie du bâti.According to the invention, this object is fulfilled by an elevator of the kind indicated above, characterized in that the guide rails comprise two pairs of main rails, associated respectively with the buckets and defining, for the main wheels of each bucket, two paths distinct over their entire length between the lower position and the upper position, and in that, on each side of the buckets, a main rail of one pair is fixed to the corresponding rail of the other pair at several points to form with it a rigid lateral structure forming part of the frame.

De préférence, ladite structure latérale rigide comporte une zone supérieure et une zone inférieure dans lesquelles les deux rails principaux lui appartenant sont adjacents et sont fixés rigidement l'un à l'autre pour former un élément structural unitaire dans ladite zone. En outre, ladite structure latérale rigide comporte une zone centrale de croisement où les deux rails principaux sont espacés et sont reliés mutuellement par des barres formant avec eux une structure triangulée.Preferably, said rigid lateral structure comprises an upper zone and a lower zone in which the two main rails belonging to it are adjacent and are rigidly fixed to each other to form a unitary structural element in said zone. In addition, said rigid lateral structure comprises a central crossing zone where the two main rails are spaced apart and are interconnected by bars forming with them a triangulated structure.

Une forme avantageuse de l'invention prévoit que les roues principales ont des emplacements différents sur les deux godets, de façon que les positions inférieures et supérieures soient les mêmes pour les deux godets. En outre, les rails de guidage peuvent comprendre des rails secondaires disposés à proximité de la position inférieure et de la position supérieure pour guider une paire de roues secondaires de chaque godet, lesquelles ont des emplacements identiques sur les deux godets.An advantageous form of the invention provides that the main wheels have different locations on the two buckets, so that the lower and upper positions are the same for the two buckets. In addition, the guide rails may include secondary rails disposed near the lower position and the upper position for guiding a pair of secondary wheels of each bucket, which have identical locations on the two buckets.

Dans une forme de réalisation particulièrement sûre, les moyens souples de traction sont formés par deux chaînes disposées latéralement par rapport aux godets et passant sur deux roues dentées qui sont solidaires d'un arbre commun. Les moyens motorisés peuvent comprendre un groupe motoréducteur électrique couplé à l'arbre commmun. Un frein électrique ou hydraulique peut être couplé à l'arbre commun.In a particularly safe embodiment, the flexible traction means are formed by two chains arranged laterally relative to the buckets and passing over two toothed wheels which are integral with a common shaft. The motorized means can comprise an electric geared motor group coupled to the common shaft. An electric or hydraulic brake can be coupled to the common shaft.

Au lieu d'un entraînement par motoréducteur, les moyens motorisés peuvent comprendre au moins un mécanisme à vérin hydraulique. En particulier, les moyens motorisés peuvent comprendre un seul mécanisme à vérin hydraulique, comportant des bras articulés couplés à un seul des godets, le vérin étant à double effet pour entraîner ledit godet dans les deux sens de déplacement, tandis que l'autre godet suit les déplacements du premier grâce aux moyens de traction et à son propre poids.Instead of a geared motor drive, the motorized means can include at least one hydraulic cylinder mechanism. In particular, the motorized means can comprise a single mechanism with a hydraulic cylinder, comprising articulated arms coupled to only one of the buckets, the cylinder being double-acting to drive the said bucket in both directions of movement, while the other bucket follows displacements of the first thanks to the means of traction and its own weight.

D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description suivante de deux formes de réalisation, présentées à titre d'exemples non limitatifs, et illustrées par les dessins annexés, dans lesquels :

  • la figure 1 est une vue schématique en élévation latérale d'une forme de réalisation d'un élévateur à granulats selon l'invention, dans une première position extrême des godets,
  • la figure 2 est une vue analogue à la figure 1, pour l'autre position extrême des godets,
  • la figure 3 montre schématiquement comment les godets se croisent dans une position intermédiaire,
  • la figure 4 est une vue schématique en élévation frontale de l'objet de la figure 1 et,
  • la figure 5 est une vue analogue à la figure 3, représentant une autre forme de réalisation d'un élévateur selon l'invention.
Other characteristics and advantages of the present invention will appear in the following description of two embodiments, presented by way of nonlimiting examples, and illustrated by the appended drawings, in which:
  • FIG. 1 is a schematic side elevation view of an embodiment of an aggregate elevator according to the invention, in a first extreme position of the buckets,
  • FIG. 2 is a view similar to FIG. 1, for the other extreme position of the buckets,
  • FIG. 3 schematically shows how the buckets cross in an intermediate position,
  • FIG. 4 is a diagrammatic view in front elevation of the object of FIG. 1 and,
  • Figure 5 is a view similar to Figure 3 showing another embodiment of an elevator according to the invention.

Dans la forme illustrée par les figures 1 à 4, l'élévateur à granulats comporte un premier godet 1 et un second godet 2 qui ont des capacités égales et qui forment chacun un chariot ayant deux roues principales 3 et deux roues secondaires 4. Les roues principales 3 du godet 1 circulent le long d'une voie formée par une paire de rails latéraux 5, tandis que les roues principales 3 du godet 2 circulent le long d'une autre voie, formée par une autre paire de rails latéraux 6. Les rails principaux d'une même paire sont formés de préférence de profilés à section en U qui se font face mutuellement et dans lesquels sont engagées les roues principales du godet correspondant. Les rails 5 et 6 de chaque côté sont disposés dans un même plan vertical et font partie d'un bâti rigide 8 comprenant notamment, dans le plan vertical de deux rails principaux, une base 8a, une béquille 8b reliant celle-ci au rail 6, ainsi que des traverses 8c et une diagonale 8d fixées aux deux rails 5 et 6 pour former avec eux une structure latérale triangulée rigide. Des traverses 8e (figure 4) relient les deux structures latérales ainsi formées.In the form illustrated in FIGS. 1 to 4, the aggregate elevator comprises a first bucket 1 and a second bucket 2 which have equal capacities and which each form a carriage having two main wheels 3 and two secondary wheels 4. The wheels main 3 of bucket 1 circulate along a track formed by a pair of side rails 5, while the main wheels 3 of bucket 2 circulate along another track, formed by another pair of side rails 6. The main rails of the same pair are preferably formed from U-section profiles which face each other and in which the main wheels of the corresponding bucket are engaged. The rails 5 and 6 on each side are arranged in the same vertical plane and form part of a rigid frame 8 comprising in particular, in the vertical plane of two main rails, a base 8a, a crutch 8b connecting the latter to rail 6, as well as cross members 8c and a diagonal 8d fixed to the two rails 5 and 6 to form with them a rigid triangulated lateral structure. Cross members 8e (Figure 4) connect the two lateral structures thus formed.

Les roues secondaires 4 des deux godets sont disposées légèrement en dedans par rapport aux rails 5 et 6 et sont destinées à s'engager dans des tronçons de rails de guidage inférieurs 9 et supérieurs 10, pour orienter convenablement les godets 1 et 2 aux deux extrémités de leur course le long des rails respectifs 5 et 6. La figure 1 montre le godet 1 dans sa position inférieure de fin de course, où il est stabilisé par l'engagement de ses roues de guidage 4 dans les rails 9 et où il est prêt à être rempli de granulats à partir d'une trémie de pesage 11. En même temps, le godet 2 se trouve dans sa position supérieure de fin de course, où il est basculé de manière à déverser son contenu dans un récipient tel qu'un malaxeur 12, par exemple dans une centrale de fabrication de béton ou de grave-ciment.The secondary wheels 4 of the two buckets are arranged slightly inward relative to the rails 5 and 6 and are intended to engage in sections of lower guide rails 9 and upper 10, to properly orient the buckets 1 and 2 at the two ends. of their travel along the respective rails 5 and 6. Figure 1 shows the bucket 1 in its lower end position, where it is stabilized by the engagement of its guide wheels 4 in the rails 9 and where it is ready to be filled with aggregates from a weighing hopper 11. At the same time, the bucket 2 is in its upper end-of-travel position, where it is tilted so as to pour its contents into a container such as a mixer 12, for example in a concrete or gravel-cement manufacturing plant.

Les godets 1 et 2 sont reliés l'un à l'autre, en avant de l'axe de leur roues principales 3, par une paire de chaînes Gall 14 disposées latéralement par rapport aux godets et passant sur des roues dentées 15 solidaires d'un arbre transversal 16 monté au sommet du bâti 8, sur les extrémités supérieures des rails 5 et 6. La rotation de l'arbre 16 est commandée par un groupe motoréducteur électrique 17 comprenant un frein 18 électrique ou hydraulique. Grâce à la liaison par chaînes 14, les poids à vide des deux godets 1 et 2 s'équilibrent mutuellement, de sorte que le groupe motoréducteur 17 ne doit entraîner à la montée, ou éventuellement freiner à l'arrêt, que la charge utile du godet plein. La longeur des chaînes 14 est telle que, comme le montre la figure 1, le godet 2 se trouve dans sa position supérieure de déversement dans le malaxeur 12 quand le godet 1 se trouve dans sa position inférieure de chargement par la trémie 11. Inversement, la position inférieure de fin de course du godet 2 est la même que la position inférieure du godet 1, et en même temps le godet 1 se trouve dans une position supérieure semblable à celle du godet 2. Cette identité des positions respectives des deux godets résulte simplement d'un positionnement différent des roues principales 3 de chaque godet, comme on le voit particulièrement dans la figure 3 représentant schématiquement une coupe suivant un plan vertical médian de l'élévateur. La cote X représente l'entraxe des rails principaux 5 et 6 dans leur zone supérieure 30 et inférieure 31, où ils sont superposés et assemblés pour former une structure particulièrement rigide. Les axes des roues 3 des deux godets sont décalés mutuellement dans la même mesure X, perpendiculairement au fond de chaque godet. Dans l'exemple représenté, l'axe des roues 3 du godet 1 est surélevé de X/2 par rapport au fond du godet, tandis que l'axe correspondant du godet 2 est décalé dans la même mesure, mais dans le sens opposé, par rapport au fond du godet. Il est prévu en outre un décalage longitudinal Y entre ces deux axes, par rapport aux roues de guidage 4 qui ont sensiblement le même emplaçement sur les deux godets, pour tenir compte des positions différentes des rails 5 et 6 par rapport à la position supérieure des godets, comme on le voit dans les figures 1 et 2.The buckets 1 and 2 are connected to each other, in front of the axis of their main wheels 3, by a pair of Gall chains 14 disposed laterally relative to the buckets and passing on toothed wheels 15 integral with a transverse shaft 16 mounted at the top of the frame 8, on the upper ends of the rails 5 and 6. The rotation of the shaft 16 is controlled by an electric geared group 17 comprising an electric or hydraulic brake 18. Thanks to the chain link 14, the unladen weights of the two buckets 1 and 2 balance each other, so that the gearmotor group 17 must not cause the ascent, or possibly brake when stopped, the payload of the full bucket. The length of the chains 14 is such that, as shown in FIG. 1, the bucket 2 is in its upper pouring position in the mixer 12 when the bucket 1 is in its lower loading position by the hopper 11. Conversely, the lower end position of the bucket 2 is the same as the lower position of the bucket 1, and at the same time the bucket 1 is in an upper position similar to that of the bucket 2. This identity of the positions respective of the two buckets simply results from a different positioning of the main wheels 3 of each bucket, as seen particularly in Figure 3 schematically showing a section along a vertical median plane of the elevator. Dimension X represents the distance between the main rails 5 and 6 in their upper 30 and lower 31 zones, where they are superimposed and assembled to form a particularly rigid structure. The axes of the wheels 3 of the two buckets are offset mutually to the same extent X, perpendicular to the bottom of each bucket. In the example shown, the axis of the wheels 3 of bucket 1 is raised by X / 2 relative to the bottom of the bucket, while the corresponding axis of bucket 2 is offset in the same measure, but in the opposite direction, relative to the bottom of the bucket. There is further provided a longitudinal offset Y between these two axes, relative to the guide wheels 4 which have substantially the same location on the two buckets, to take account of the different positions of the rails 5 and 6 relative to the upper position of the buckets, as seen in Figures 1 and 2.

Un cycle de fonctionnement de l'élévateur permet de remplir deux fois le malaxeur 12. A partir de l'état illustré par la figure 1, où le godet 1 est rempli suivant la flèche A et le godet 2 est vidé suivant la flèche B, le motoréducteur 17 est mis en action pour entraîner les chaînes 14 dans le sens indiqué par les flèches, pour faire monter le godet 1 et descendre le godet 2. A mi-chemin, les deux godets se croisent comme l'indique la figure 3, leurs rails respectifs 5 et 6 ayant des tracés qui s'écartent dans une mesure suffisante. Dès que le godet 1 approche de sa position supérieure, ses roues de guidage 4 s'engagent dans les rails de guidage 10 et le font basculer pour le vider dans la phase finale de sa course. En même temps, les roues 4 du godet 2 s'engagent dans les rails inférieurs de guidage 9 et stabilisent ce godet pendant son remplissage. Cette opération et la montée subséquente du godet 2 s'effectuent pendant que le malaxeur 12 traite la charge qu'il a reçue du godet 1.
En plus des avantages inhérents à un dispositif à deux godets par rapport aux élévateurs à un seul godet, à savoir un débit pratiquement doublé, une moindre puissance installée, une moindre consommation d'énergie par tonne de granulats, une réduction de la sollicitation et de l'usure des freins, l'élévateur selon l'invention présente aussi des avantages remarquables vis-à-vis de l'état de la technique décrit plus haut. Du fait de l'absence d'aiguillage, chaque godet est guidé d'une manière continue et positive par des organes fixes tout au long de sa course, ce qui élimine le risque de déraillement et permet un fonctionnement exempt de panne. Les surfaces internes des rails étant lisses et continues, elles n'ont pas tendance à retenir des poussières ou des granulats. La combinaison des rails principaux 5 et 6 pour former une structure rigide permet d'assurer une meilleure stabilité de chaque rail et une meilleure rigidité du bâti 8, sans renforcer les rails ni augmenter leur section, ce qui est particulièrement intéressant pour des hauteurs élevées. Grâce à la double chaîne 14 coopérant avec les roues dentées 15, on dispose d'une double sécurité en regard d'une éventuelle chute d'un godet, car le frein continue d'agir en cas de rupture d'une chaîne.An elevator operating cycle enables the mixer 12 to be filled twice. From the state illustrated in FIG. 1, where the cup 1 is filled according to arrow A and the cup 2 is emptied according to arrow B, the gearmotor 17 is put into action to drive the chains 14 in the direction indicated by the arrows, to raise the bucket 1 and lower the bucket 2. Halfway, the two buckets intersect as shown in FIG. 3, their respective rails 5 and 6 having tracks which deviate to a sufficient extent. As soon as the bucket 1 approaches its upper position, its guide wheels 4 engage in the guide rails 10 and cause it to tilt to empty it in the final phase of its stroke. At the same time, the wheels 4 of the bucket 2 engage in the lower guide rails 9 and stabilize this bucket during filling. This operation and the subsequent rise of the bucket 2 are carried out while the mixer 12 processes the load it has received from the bucket 1.
In addition to the advantages inherent in a device with two buckets per compared to elevators with a single bucket, i.e. a practically doubled flow, a lower installed power, a lower energy consumption per ton of aggregates, a reduction of the request and the wear of the brakes, the elevator according to The invention also has remarkable advantages over the state of the art described above. Due to the absence of switches, each bucket is guided in a continuous and positive manner by fixed members throughout its travel, which eliminates the risk of derailment and allows operation free of breakdown. The internal surfaces of the rails being smooth and continuous, they do not tend to retain dust or aggregates. The combination of the main rails 5 and 6 to form a rigid structure ensures better stability of each rail and better rigidity of the frame 8, without strengthening the rails or increasing their section, which is particularly advantageous for high heights. Thanks to the double chain 14 cooperating with the toothed wheels 15, there is a double safety against a possible fall of a bucket, because the brake continues to act in the event of a chain break.

La figure 5 illustre une forme de réalisation dans laquelle le groupe motoréducteur 17 est remplacé par un autre moyen d'entraînement, à savoir un mécanisme articulé 20 actionné par un vérin hydraulique 21 et couplé au premier godet 1 par une articulation située sur l'axe des roues principales 3 ou à proximité. Le mécanisme 20 est de préférence du type décrit dans la publication FR-A-2 642 410, avec un bras arrière 22, monté par une articulation 23 à axe horizontal sur une partie fixe 24 du bâti 8, et un bras avant 25 relié au bras arrière 22, au vérin 21 et au godet 1 par des articulations à axes horizontaux. Le vérin est également monté sur une articulation 26 à axe horizontal. Tous ces axes sont parallèles. Ce type de mécanisme a l'avantage de permettre une longue course du godet pour un encombrement relativement faible. Dans le présent exemple, le vérin 21 est à double effet, pour entraîner positivement le godet 1 dans les deux sens indiqués par les flèches C et D, tandis que le godet 2 suit simplement le godet 1 en étant suspendu aux chaînes 14. Quand le vérin fait monter le godet 1 plein, suivant la flèche C, le godet 2 descend à vide par son propre poids. Ensuite, une fois que le godet 1 s'est vidé et que l'autre a été rempli, le vérin est actionné en sens contraire de façon à tirer vers le bas le godet 1 vide, suivant la flèche D, si bien que les chaînes 14 tirent vers le haut le godet 2 plein. L'arbre 16 tourne alors librement. Il peut être couplé à un frein de sécurité qui entre en action en cas de vitesse excessive. Toutefois, en fonctionnement normal, il n'y a pas de freinage pendant les déplacements, ce qui évite un gaspillage d'énergie. La disposition des rails et des roues des godets est la même que dans l'exemple précédent.FIG. 5 illustrates an embodiment in which the geared motor group 17 is replaced by another drive means, namely an articulated mechanism 20 actuated by a hydraulic cylinder 21 and coupled to the first bucket 1 by an articulation situated on the axis main wheels 3 or nearby. The mechanism 20 is preferably of the type described in publication FR-A-2 642 410, with a rear arm 22, mounted by a joint 23 with a horizontal axis on a fixed part 24 of the frame 8, and a front arm 25 connected to the rear arm 22, to the jack 21 and to the bucket 1 by articulations with horizontal axes. The cylinder is also mounted on a joint 26 with a horizontal axis. All these axes are parallel. This type of mechanism has the advantage of allowing a long stroke of the bucket for a relatively small size. In the present example, the jack 21 is double acting, to positively drive the bucket 1 in the two directions indicated by the arrows C and D, while the bucket 2 simply follows the bucket 1 while being suspended from the chains 14. When the cylinder made mount bucket 1 full, following arrow C, bucket 2 descends empty by its own weight. Then, once the bucket 1 has emptied and the other one has been filled, the cylinder is actuated in the opposite direction so as to pull down the empty bucket 1, according to arrow D, so that the chains 14 pull up the full bucket 2. The shaft 16 then rotates freely. It can be coupled to a safety brake which activates in the event of excessive speed. However, in normal operation, there is no braking during travel, which avoids wasting energy. The arrangement of the rails and the wheels of the buckets is the same as in the previous example.

La présente invention n'est pas limitée aux exemples décrits ci-dessus, mais elle s'étend à toute modification ou variante évidente pour un homme du métier. Par exemple, la liaison par chaînes 14 assurant l'entraînement combiné des deux chariots pourrait être remplacée par un double treuil à câbles. De même, par rapport à l'exemple de la figure 4, on pourrait supprimer les chaînes 14 et remplacer le mécanisme à double effet 20 par deux mécanismes à vérins hydrauliques à simple effet, agissant chacun sur un godet et coordonnés au moyen de liaisons hydrauliques permettant aussi d'équilibrer les poids morts.The present invention is not limited to the examples described above, but it extends to any modification or variant obvious to a person skilled in the art. For example, the chain link 14 ensuring the combined drive of the two carriages could be replaced by a double cable winch. Similarly, with respect to the example of FIG. 4, the chains 14 could be eliminated and the double-acting mechanism 20 replaced by two mechanisms with single-acting hydraulic cylinders, each acting on a bucket and coordinated by means of hydraulic connections also allowing the dead weights to be balanced.

Claims (10)

Elévateur à granulats comportant :
   un bâti (8) pourvu de rails de guidage,
   deux godets à granulats (1,2) pourvus de roues qui sont guidées par les rails sur le parcours de chaque godet entre une position inférieure et une position supérieure du godet,
   des organes souples de traction (14) reliant les deux godets et passant sur des roues ou poulies situées à proximité ou en dessus de ladite position supérieure, de sorte qu'un godet est dans sa position supérieure quand l'autre est dans sa position inférieure,
   et des moyens motorisés (17) agencés pour déplacer les godets simultanément et dans des sens opposés le long des rails de guidage,
   caractérisé en ce que les rails de guidage comportent deux paires de rails principaux (5,6), associées respectivement aux godets (1,2) et définissant, pour des roues principales (3) de chaque godet, deux parcours distincts sur toute leur longueur entre la position inférieure et la position supérieure, et en ce que, de chaque côté des godets, un rail principal (5) d'une paire est fixé au rail correspondant (6) de l'autre paire en plusieurs points pour former avec lui une structure latérale rigide faisant partie du bâti (8).Aggregate elevator comprising:
a frame (8) provided with guide rails,
two aggregate buckets (1,2) provided with wheels which are guided by the rails on the path of each bucket between a lower position and an upper position of the bucket,
flexible traction members (14) connecting the two buckets and passing over wheels or pulleys located near or above said upper position, so that one bucket is in its upper position when the other is in its lower position ,
and motorized means (17) arranged to move the buckets simultaneously and in opposite directions along the guide rails,
characterized in that the guide rails comprise two pairs of main rails (5,6), respectively associated with the buckets (1,2) and defining, for main wheels (3) of each bucket, two separate paths over their entire length between the lower position and the upper position, and in that, on each side of the buckets, a main rail (5) of one pair is fixed to the corresponding rail (6) of the other pair at several points to form with it a rigid lateral structure forming part of the frame (8). Elévateur selon la revendication 1, caractérisé en ce que ladite structure latérale rigide comporte une zone supérieure (30) et une zone inférieure (31) dans lesquelles les deux rails principaux (5,6) lui appartenant sont adjacents et sont fixés rigidement l'un à l'autre pour former un élément structural unitaire dans ladite zone (30, 31) .Elevator according to claim 1, characterized in that said rigid lateral structure comprises an upper zone (30) and a lower zone (31) in which the two main rails (5,6) belonging to it are adjacent and are rigidly fixed one to each other to form a unitary structural element in said zone (30, 31). Elévateur selon la revendication 2, caractérisé en ce que ladite structure latérale rigide comporte une zone centrale de croisement où les deux rails principaux (5,6) sont espacés et sont reliés mutuellement par des barres (8c,8d) formant avec eux une structure triangulée.Elevator according to claim 2, characterized in that said rigid lateral structure comprises a central crossing zone where the two main rails (5,6) are spaced apart and are interconnected by bars (8c, 8d) forming with them a triangulated structure . Elévateur selon la revendication 1, caractérisé en ce que les roues principales (3) ont des emplacements différents sur les deux godets (1,2), de façon que les positions inférieures et supérieures soient les mêmes pour les deux godets.Elevator according to claim 1, characterized in that the wheels main (3) have different locations on the two buckets (1,2), so that the lower and upper positions are the same for the two buckets. Elévateur selon la revendication 4, caractérisé en ce que les rails de guidage comprennent des rails secondaires (9,10) disposés à proximité de la position inférieure et de la position supérieure pour guider une paire de roues secondaires (4) de chaque godet, lesquelles ont des emplacements identiques sur les deux godets.Elevator according to claim 4, characterized in that the guide rails comprise secondary rails (9,10) arranged near the lower position and the upper position for guiding a pair of secondary wheels (4) of each bucket, which have identical locations on the two buckets. Elévateur selon la revendication 1, caractérisé en ce que les moyens souples de traction sont formés par deux chaînes (14) disposées latéralement par rapport aux godets (1,2) et passant sur deux roues dentées (15) qui sont solidaires d'un arbre commun (16).Elevator according to claim 1, characterized in that the flexible traction means are formed by two chains (14) arranged laterally with respect to the buckets (1,2) and passing over two toothed wheels (15) which are integral with a shaft common (16). Elévateur selon la revendication 6, caractérisé en ce que les moyens motorisés comprennent un groupe motoréducteur électrique (17) couplé à l'arbre commmun (6) .Elevator according to claim 6, characterized in that the motorized means comprise an electric gearmotor group (17) coupled to the common shaft (6). Elévateur selon la revendication 6 ou 7, caractérisé en ce qu'un frein électrique (18) ou hydraulique est couplé à l'arbre commun (16).Elevator according to claim 6 or 7, characterized in that an electric (18) or hydraulic brake is coupled to the common shaft (16). Elévateur selon l'une des revendications 1 à 6, caractérisé en ce que les moyens motorisés comprennent au moins un mécanisme à vérin hydraulique (21) .Elevator according to one of claims 1 to 6, characterized in that the motorized means comprise at least one hydraulic cylinder mechanism (21). Elévateur selon la revendication 9, caractérisé en ce que les moyens motorisés comprennent un seul mécanisme (20) à vérin hydraulique, comportant des bras articulés couplés à un seul (1) des godets, le vérin (21) étant à double effet pour entraîner ledit godet (1) dans les deux sens de déplacement, tandis que l'autre godet (2) suit les déplacements du premier grâce aux moyens de traction (14) et à son propre poids.Elevator according to claim 9, characterized in that the motorized means comprise a single mechanism (20) with hydraulic cylinder, comprising articulated arms coupled to a single (1) of buckets, the cylinder (21) being double-acting to drive said bucket (1) in both directions of movement, while the other bucket (2) follows the movements of the first thanks to the traction means (14) and its own weight.
EP93440007A 1992-01-23 1993-01-25 Granular elevator with two skips Expired - Lifetime EP0553048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9200849 1992-01-23
FR9200849A FR2686585B1 (en) 1992-01-23 1992-01-23 AGGREGATE ELEVATOR COMPRISING TWO BUCKETS.

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EP0553048A1 true EP0553048A1 (en) 1993-07-28
EP0553048B1 EP0553048B1 (en) 1996-05-22

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AT (1) ATE138309T1 (en)
DE (1) DE69302706D1 (en)
FR (1) FR2686585B1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29620408U1 (en) * 1996-11-22 1997-03-06 Liebherr-Mischtechnik Gmbh, 88427 Bad Schussenried Feeding device for loading a mixer with bulk materials
EP2441728A1 (en) * 2010-10-15 2012-04-18 Mauro Service Impianti Srl Mixing tower and process for the production of conglomerates, particularly for the production of concrete or bituminous conglomerates
CN104609105A (en) * 2014-12-09 2015-05-13 中联重科物料输送设备有限公司 Skip elevator
CN104609104A (en) * 2014-12-09 2015-05-13 江苏大学 Vertical bidirectional conveying device based on chain transmission
CN106185268A (en) * 2016-07-14 2016-12-07 旌德县龙强净化材料厂 A kind of agriculture and forestry organic waste material prepares the material conveying device of activated carbon

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FR2937955B1 (en) * 2008-11-04 2010-11-19 Thales Sa METHOD FOR CAPTURING A CONTAINER OF PLANETARY SOIL SAMPLES MOVING INTO SPACE

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DE1213329B (en) * 1964-03-06 1966-03-24 Elba Werk Maschinen Gmbh & Co Device for the production of concrete and for the delivery of the same to transport vehicles
FR1465168A (en) * 1966-01-21 1967-01-06 Double bucket elevator conveyor system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1213329B (en) * 1964-03-06 1966-03-24 Elba Werk Maschinen Gmbh & Co Device for the production of concrete and for the delivery of the same to transport vehicles
FR1465168A (en) * 1966-01-21 1967-01-06 Double bucket elevator conveyor system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29620408U1 (en) * 1996-11-22 1997-03-06 Liebherr-Mischtechnik Gmbh, 88427 Bad Schussenried Feeding device for loading a mixer with bulk materials
EP0873835A2 (en) * 1996-11-22 1998-10-28 Liebherr-Mischtechnik GmbH Apparatus for charging a mixer with bulk material
EP0873835A3 (en) * 1996-11-22 2000-06-14 Liebherr-Mischtechnik GmbH Apparatus for charging a mixer with bulk material
EP2441728A1 (en) * 2010-10-15 2012-04-18 Mauro Service Impianti Srl Mixing tower and process for the production of conglomerates, particularly for the production of concrete or bituminous conglomerates
CN104609105A (en) * 2014-12-09 2015-05-13 中联重科物料输送设备有限公司 Skip elevator
CN104609104A (en) * 2014-12-09 2015-05-13 江苏大学 Vertical bidirectional conveying device based on chain transmission
CN104609104B (en) * 2014-12-09 2017-02-22 江苏大学 Vertical bidirectional conveying device based on chain transmission
CN104609105B (en) * 2014-12-09 2017-05-03 中联重科物料输送设备有限公司 Skip elevator
CN106185268A (en) * 2016-07-14 2016-12-07 旌德县龙强净化材料厂 A kind of agriculture and forestry organic waste material prepares the material conveying device of activated carbon

Also Published As

Publication number Publication date
ATE138309T1 (en) 1996-06-15
EP0553048B1 (en) 1996-05-22
FR2686585B1 (en) 1994-04-01
FR2686585A1 (en) 1993-07-30
DE69302706D1 (en) 1996-06-27

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