EP0692317A1 - Device for generating vibrations, particularly for a press-table used for the manufacture of concrete products - Google Patents

Device for generating vibrations, particularly for a press-table used for the manufacture of concrete products Download PDF

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Publication number
EP0692317A1
EP0692317A1 EP95420191A EP95420191A EP0692317A1 EP 0692317 A1 EP0692317 A1 EP 0692317A1 EP 95420191 A EP95420191 A EP 95420191A EP 95420191 A EP95420191 A EP 95420191A EP 0692317 A1 EP0692317 A1 EP 0692317A1
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EP
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Prior art keywords
shafts
lines
pair
chassis
shaft
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EP95420191A
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German (de)
French (fr)
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EP0692317B1 (en
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Daniel Ancrenaz
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/10—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy
    • B06B1/16—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of mechanical energy operating with systems involving rotary unbalanced masses
    • B06B1/161—Adjustable systems, i.e. where amplitude or direction of frequency of vibration can be varied
    • B06B1/166—Where the phase-angle of masses mounted on counter-rotating shafts can be varied, e.g. variation of the vibration phase

Definitions

  • the present invention relates to a vibration generating device, in particular intended to equip the table with a press for manufacturing concrete products such as pavers, blocks, border elements and the like.
  • a vibration generating device comprising two pairs of shafts each equipped with unbalances.
  • the unbalances of one pair of shafts can be out of phase with those of the other pair of shafts, so that the unbalances can be placed either in phase or in phase opposition from one pair to another , thus modulating the amplitude of the vibrations transmitted to the table, between a maximum value and a zero value.
  • This phase shift is achieved by means of a toothed belt engaged, on the one hand, around toothed pulleys wedged on the shafts and, on the other hand, on idler pulleys mounted idly on a chassis movable in a plane perpendicular to the shafts .
  • Patents or patent applications US 4 830 597, EP 0 400 510, WO 92/20467 or EP 0 600 526 describe devices of this type.
  • the toothed belts of these devices have significant lengths since they must be engaged around the pulleys of each shaft, and the movable frames have a high inertia.
  • These belts are subjected to significant and repeated tensile stresses, generating elongation and wear which are the source of precise positioning defects of the unbalances in phase opposition.
  • the parasitic vibrations which result from a slight phase shift of the unbalances entail, at the time of demolding, a risk of alteration or even destruction of the fresh products.
  • the present invention aims to remedy all of these drawbacks.
  • the device it relates to is of the aforementioned type, comprising four lines of parallel shafts, equipped with imbalances and distributed in two superimposed pairs, and a toothed belt engaged, on the one hand, around toothed pulleys wedged on the lines of shafts and, on the other hand, on idler side pulleys mounted idly on a chassis movable in a plane perpendicular to the lines of trees, the displacement of this chassis making it possible to phase the imbalances of a pair of lines of trees by relative to those of the pair of superimposed shaft lines, so that the unbalances can be placed either in phase or in phase opposition from one pair to another.
  • the two levers and the connecting rod have a very low inertia, and transmit only limited stresses to the belt during their passage from one position to the other.
  • the phase shift is rapid and the maintenance of the belt is limited, so that the production rate obtained is high.
  • the length of the belt is kept substantially constant, whatever the position of the levers, which is also conducive to the longevity of the belt and to obtaining a precise positioning of the imbalances in phase opposition.
  • the relative position of the two levers can be adjusted so as to compensate for any lengthening of the belt, and to keep an optimum tension of the latter.
  • the belt is engaged around only two pulleys and has a reduced length, also limiting the risks of wear and elongation.
  • the drive motor is directly connected to one of the lines of shafts comprising a toothed pulley and is not mounted on the chassis.
  • the toothed belt transmits only half of the driving power and the inertia of the chassis is reduced, which contributes to limiting the wear of the belt.
  • the vibrator shafts are supported by lubricated bearings, placed and maintained in the housings.
  • the temperature in these casings during operation remains low and stable, despite the turbulence caused by the high rotation speed and the amplitude of the vibrations.
  • the motor is arranged coaxially with the shaft line which it drives. This arrangement allows the engine to be moved away from the molding location, to isolate it from the dusty atmosphere surrounding the press, which is important for the reliability of this engine.
  • each lever has the shape of a relatively closed V and with branches of unequal lengths, the shortest branch comprising the idler pulley on its free end , and the longest branch being connected to the articulated rod.
  • the figures represent a vibration generator device 1 equipping table 2 with a press for manufacturing concrete products such as pavers, blocks, edge elements and the like.
  • the table 2 rests on the frame 3 of the press by means of flexible studs 4 and comprises, fixed to its lower face, two casings 5 each traversed by four shafts 6 equipped with unbalances 7. These shafts 6 are distributed on each casing 5, in two superimposed pairs, and are two to two coaxial from one casing 5 to another.
  • the shafts 6 are connected, by means of flexible couplings of cardan type 8, to drive shafts 9, the shafts 6 and 9 thus constituting four lines of shafts distributed in two superposed pairs.
  • shafts 9 Four of the shafts 9 include pinions 10 wedged on them.
  • the pinions 10 of two shafts 9 of the same pair mesh with each other.
  • the pinions 10 are housed in a casing 11, integral with the press frame, through which the shafts 9 pass.
  • the housings 5 and 11 contain the bearings of the shafts 6 and 9, and oil for the lubrication of these bearings and of the pinions 10.
  • One of these two shafts 9 is connected, by means of a flexible cardan coupling, to a drive motor 14, arranged coaxially with the shaft 9.
  • This motor is carried by a base fixed on a base 15.
  • Each lever 16 is placed laterally with respect to the shafts 6 and 9 and can pivot in a plane perpendicular to them.
  • the lower parts of the levers 16 are mounted in yokes fitted by walls 18 integral with the base 15.
  • the levers 16 have the shape of a relatively closed V and with branches 16a, 16b of unequal lengths.
  • the shortest branches 16a include idler pulleys 20, mounted on their free end, and the longest branches 16b, clearly protruding beyond the pulleys 20, are connected to the connecting rod 17 at their ends.
  • a toothed belt 21 is engaged, on the one hand, around the pulleys 12 and, on the other hand, on the idler pulleys 20, which constitute lateral return pulleys.
  • a double-acting cylinder 25 is connected to one of the levers 16 and to the base 15, while being pivotally mounted relative to one and to the other.
  • the shafts 6 and 9 are rotated by the motor 14, either directly with respect to the shaft 6 and the shaft 9 to which it is directly connected, or by means of the pinions 10 and the belt 21 for other trees.
  • the pinions 10 are used to drive the shafts 6 and 9 of each pair of shaft lines in opposite directions to one another.
  • the jack 25 makes it possible to move the chassis formed by the levers 16 and by the connecting rod 17 in a plane perpendicular to the shafts 6 and 9, and, therefore, to vary the length of the belt 21 extending between the two toothed pulleys 12.
  • This variation in length makes it possible to phase the unbalances 7 of the pair of upper shaft lines relative to those of the pair of lower shaft lines, so that the unbalances 7 can be placed either in phase or in opposition to phase from one pair to another, thus making it possible to modulate the amplitude of the vibrations transmitted to table 2, between a maximum value and a zero value.
  • the two pivoting levers 16 and the connecting rod 17 have a very low inertia, and transmit only limited stresses to the belt 21 when they pass from one position to the other. They thus make it possible to considerably limit the wear of the belt 21 and ensure precise positioning of the unbalances 7 in phase opposition.
  • the phase shift is rapid and the maintenance of the belt 21 is limited, so that the production rate obtained is high.
  • the length of the belt 21 is kept substantially constant, whatever the position of these levers 16, which is conducive to the longevity of the belt 21 and obtaining a precise positioning of the imbalances in phase opposition.
  • the belt 21 is engaged around only two pulleys 12, has a reduced length and transmits to the trees only half of the driving power, which also contributes to limiting the risks of wear and elongation.
  • the motor is far from the molding location, and is therefore isolated from the dusty environment surrounding the press.
  • the device 1 is compact and can be easily integrated into existing machines, with minimal adaptations.
  • the temperature in the casings 5 and 11 during operation remains low and stable.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The vibration generator comprises four parallel line shafts (6,9), set out in two superposed pairs, equipped with out of balance masses (7). A notched belt (21) engages a notched pulley (12) wedged on the shafts and return idler pulleys (20) mounted on a chassis (16) displaceable in a plane perpendicular to the shafts. The chassis displacement the mass pairs to be placed either in phase or in phase opposition to each other. Each line shaft has a pinion (10) wedged on it, with pinions on one line shaft pair meshing with those on the other pair. Only one of the two line shafts of each pair carries a notched pulley around which the notched belt is engaged. The chassis is constituted by two lateral levers (16), pivoted on a fixed frame (15), connected together by an upper connecting rod assembly constituting a deformable quadrilateral. <IMAGE>

Description

La présente invention concerne un dispositif générateur de vibrations, notamment destiné à équiper la table d'une presse de fabrication de produits en béton tels que des pavés, blocs, éléments de bordures et similaires.The present invention relates to a vibration generating device, in particular intended to equip the table with a press for manufacturing concrete products such as pavers, blocks, border elements and the like.

Il est connu d'équiper une telle presse d'un dispositif générateur de vibrations comprenant deux paires d'arbres équipés chacun de balourds. Les balourds d'une paire d'arbres peuvent être déphasés par rapport à ceux de l'autre paire d'arbres, de telle sorte que les balourds peuvent être placés soit en phase soit en opposition de phase d'une paire à l'autre, permettant ainsi de moduler l'amplitude des vibrations transmises à la table, entre une valeur maximale et une valeur nulle. Ce déphasage est réalisé au moyen d'une courroie crantée engagée, d'une part, autour de poulies crantées calées sur les arbres et, d'autre part, sur des poulies de renvoi montées folles sur un châssis déplaçable dans un plan perpendiculaire aux arbres.It is known to equip such a press with a vibration generating device comprising two pairs of shafts each equipped with unbalances. The unbalances of one pair of shafts can be out of phase with those of the other pair of shafts, so that the unbalances can be placed either in phase or in phase opposition from one pair to another , thus modulating the amplitude of the vibrations transmitted to the table, between a maximum value and a zero value. This phase shift is achieved by means of a toothed belt engaged, on the one hand, around toothed pulleys wedged on the shafts and, on the other hand, on idler pulleys mounted idly on a chassis movable in a plane perpendicular to the shafts .

Les brevets ou demandes de brevets US 4 830 597, EP 0 400 510, WO 92/20467 ou EP 0 600 526 décrivent des dispositifs de ce type.Patents or patent applications US 4 830 597, EP 0 400 510, WO 92/20467 or EP 0 600 526 describe devices of this type.

Certains dispositifs existants présentent l'inconvénient d'être complexes, longs à régler, et surtout sujets à usure.Some existing devices have the drawback of being complex, time-consuming to adjust, and above all subject to wear.

En particulier, les courroies crantées de ces dispositifs ont des longueurs importantes puisqu'elles doivent être engagées autour des poulies de chaque arbre, et les châssis déplaçables ont une inertie élevée. Ces courroies sont soumises à des contraintes de traction importantes et répétées, générant un allongement et une usure qui sont à l'origine de défauts de positionnement précis des balourds en opposition de phase. Les vibrations parasites qui résultent d'un léger déphasage des balourds entraînent, au moment du démoulage, un risque d'altération ou même de destruction des produits frais.In particular, the toothed belts of these devices have significant lengths since they must be engaged around the pulleys of each shaft, and the movable frames have a high inertia. These belts are subjected to significant and repeated tensile stresses, generating elongation and wear which are the source of precise positioning defects of the unbalances in phase opposition. The parasitic vibrations which result from a slight phase shift of the unbalances entail, at the time of demolding, a risk of alteration or even destruction of the fresh products.

L'inertie des châssis déplaçables et la maintenance engendrée par cette usure réduisent sensiblement les cadences de production des presses.The inertia of the movable frames and the maintenance generated by this wear significantly reduce the production rates of the presses.

Ces dispositifs n'équipent en outre que des presses spécifiquement conçues pour les recevoir et ne peuvent être intégrés à des machines existantes.These devices also only equip presses specifically designed to receive them and cannot be integrated into existing machines.

La présente invention vise à remédier à l'ensemble de ces inconvénients.The present invention aims to remedy all of these drawbacks.

Le dispositif qu'elle concerne est du type précité, comprenant quatre lignes d'arbres parallèles, équipées de balourds et réparties en deux paires superposées, et une courroie crantée engagée, d'une part, autour de poulies crantées calées sur les lignes d'arbres et, d'autre part, sur des poulies latérales de renvoi montées folles sur un châssis déplaçable dans un plan perpendiculaire aux lignes d'arbres, le déplacement de ce châssis permettant de déphaser les balourds d'une paire de lignes d'arbres par rapport à ceux de la paire de lignes d'arbres superposée, de telle sorte que les balourds peuvent être placés soit en phase soit en opposition de phase d'une paire à l'autre.The device it relates to is of the aforementioned type, comprising four lines of parallel shafts, equipped with imbalances and distributed in two superimposed pairs, and a toothed belt engaged, on the one hand, around toothed pulleys wedged on the lines of shafts and, on the other hand, on idler side pulleys mounted idly on a chassis movable in a plane perpendicular to the lines of trees, the displacement of this chassis making it possible to phase the imbalances of a pair of lines of trees by relative to those of the pair of superimposed shaft lines, so that the unbalances can be placed either in phase or in phase opposition from one pair to another.

Selon l'invention :

  • chaque ligne d'arbre comprend un pignon calé sur elle, les pignons de deux lignes d'arbres d'une même paire d'arbres engrènant l'un avec l'autre ;
  • l'une seulement des deux lignes d'arbres de chaque paire de lignes d'arbres comprend une poulie crantée autour de laquelle est engagée la courroie, et
  • le châssis comportant les poulies de renvoi est constitué par deux leviers latéraux montés pivotants sur un bâti fixe, reliés l'un à l'autre par une bielle supérieure, l'ensemble constituant un quadrilatère déformable.
According to the invention:
  • each tree line comprises a pinion wedged on it, the pinions of two lines of trees of the same pair of trees meshing with one another;
  • only one of the two shaft lines of each pair of shaft lines comprises a toothed pulley around which the belt is engaged, and
  • the chassis comprising the pulleys is constituted by two lateral levers pivotally mounted on a fixed frame, connected to each other by an upper connecting rod, the assembly constituting a deformable quadrilateral.

Les deux leviers et la bielle ont une très faible inertie, et ne transmettent que des contraintes limitées à la courroie lors de leur passage d'une position à l'autre.The two levers and the connecting rod have a very low inertia, and transmit only limited stresses to the belt during their passage from one position to the other.

De plus, les mouvements opposés des deux leviers, sur un secteur de cercle, s'équilibrent, ce qui permet de réduire au minimum l'inertie du châssis engendrée par ces mouvements.In addition, the opposite movements of the two levers, on a sector of a circle, balance each other, which makes it possible to minimize the inertia of the chassis generated by these movements.

Il en résulte une usure très réduite de la courroie et un positionnement précis des balourds en opposition de phase.This results in very reduced wear of the belt and precise positioning of the imbalances in phase opposition.

Le déphasage est rapide et la maintenance de la courroie est limitée, de sorte que la cadence de production obtenue est élevée.The phase shift is rapid and the maintenance of the belt is limited, so that the production rate obtained is high.

La longueur de la courroie est maintenue sensiblement constante, quelle que soit la position des leviers, ce qui est également propice à la longévité de la courroie et à l'obtention un positionnement précis des balourds en opposition de phase.The length of the belt is kept substantially constant, whatever the position of the levers, which is also conducive to the longevity of the belt and to obtaining a precise positioning of the imbalances in phase opposition.

Le cas échéant, la position relative des deux leviers peut être réglée de manière à compenser un éventuel allongement de la courroie, et à conserver une tension optimale de celle-ci.If necessary, the relative position of the two levers can be adjusted so as to compensate for any lengthening of the belt, and to keep an optimum tension of the latter.

L'entraînement en rotation des lignes d'arbres d'une même paire au moyen de pignons permet d'assurer un parfait maintien angulaire des balourds, au sein de cette paire.The rotational drive of the shaft lines of the same pair by means of pinions makes it possible to ensure perfect angular support of the unbalances, within this pair.

La courroie est engagée autour de deux poulies seulement et a une longueur réduite, limitant également les risques d'usure et d'allongement.The belt is engaged around only two pulleys and has a reduced length, also limiting the risks of wear and elongation.

De préférence, le moteur d'entraînement est directement relié à l'une des lignes d'arbres comportant une poulie cranté et n'est pas monté sur le châssis. La courroie crantée ne transmet que la moitié de la puissance motrice et l'inertie du châssis est réduite, ce qui contribue à limiter l'usure de la courroie.Preferably, the drive motor is directly connected to one of the lines of shafts comprising a toothed pulley and is not mounted on the chassis. The toothed belt transmits only half of the driving power and the inertia of the chassis is reduced, which contributes to limiting the wear of the belt.

Avantageusement :

  • la table vibrante d'une presse de fabrication de produits en béton équipée du dispositif comprend deux carters inférieurs solidarisés à elle ;
  • chaque ligne d'arbres comprend deux arbres coaxiaux équipés des balourds, dits "arbres vibreurs", montés chacun au travers de l'un de ces carters, et
  • les deux arbres vibreurs sont reliés l'un à l'autre et au dispositif générateur de vibrations, par l'intermédiaire d'accouplements souples du type cardan, à deux arbres coaxiaux, dits "arbres d'entraînement", permettant leur entraînement en rotation, dont un comporte l'un des pignons précités.
Advantageously:
  • the vibrating table of a concrete product manufacturing press equipped with the device comprises two lower casings secured to it;
  • each line of shafts comprises two coaxial shafts fitted with unbalances, called "vibrating shafts", each mounted through one of these casings, and
  • the two vibrating shafts are connected to each other and to the vibration generating device, by means of flexible couplings of the gimbal type, with two coaxial shafts, called "drive shafts", allowing their drive in rotation , one of which includes one of the aforementioned pinions.

La compacité du dispositif ainsi constitué permet de l'intégrer aisément à des machines existantes, moyennant des adaptations minimes.The compactness of the device thus formed makes it easy to integrate it into existing machines, with minimal adaptations.

Les arbres vibreurs sont supportés par des roulements lubrifiés, placés et maintenus dans les carters. La température dans ces carters lors du fonctionnement reste faible et stable, malgré les turbulences provoquées par la vitesse de rotation élevée et l'amplitude des vibrations.The vibrator shafts are supported by lubricated bearings, placed and maintained in the housings. The temperature in these casings during operation remains low and stable, despite the turbulence caused by the high rotation speed and the amplitude of the vibrations.

Avantageusement, le moteur est disposé coaxialement à la ligne d'arbre qu'il entraîne. Cette disposition permet d'éloigner le moteur de l'emplacement de moulage, pour l'isoler de l'ambiance poussiéreuse environnant la presse, ce qui est important pour la fiabilité de ce moteur.Advantageously, the motor is arranged coaxially with the shaft line which it drives. This arrangement allows the engine to be moved away from the molding location, to isolate it from the dusty atmosphere surrounding the press, which is important for the reliability of this engine.

Selon une forme de réalisation préférée de l'invention, simple et fiable de mise en oeuvre, chaque levier présente la forme d'un V relativement fermé et à branches de longueurs inégales, la branche la plus courte comprenant la poulie folle sur son extrémité libre, et la branche la plus longue étant reliée à la bielle articulée.According to a preferred embodiment of the invention, simple and reliable to use, each lever has the shape of a relatively closed V and with branches of unequal lengths, the shortest branch comprising the idler pulley on its free end , and the longest branch being connected to the articulated rod.

Pour sa bonne compréhension, l'invention est à nouveau décrite ci-dessous en référence au dessin schématique annexé, représentant, à titre d'exemple non limitatif, une forme de réalisation préférée du dispositif qu'elle concerne.

  • La figure 1 est une vue simplifiée, en élévation, de ce dispositif, appliqué à la table d'une presse de fabrication de produits en béton ;
  • la figure 2 en est une vue en coupe selon la ligne II-II de la figure 1 ;
  • la figure 3 en est une vue en coupe selon la ligne III-III de la figure 1 ;
  • la figure 4 en est une vue en coupe selon la ligne IV-IV de la figure 1, dans une première position, et
  • la figure 5 en est une vue similaire à la figure 4, dans une deuxième position.
For a good understanding, the invention is again described below with reference to the appended diagrammatic drawing, representing, by way of nonlimiting example, a preferred embodiment of the device which it relates to.
  • Figure 1 is a simplified view, in elevation, of this device, applied to the table of a press for manufacturing concrete products;
  • Figure 2 is a sectional view along the line II-II of Figure 1;
  • Figure 3 is a sectional view along the line III-III of Figure 1;
  • FIG. 4 is a sectional view along the line IV-IV of FIG. 1, in a first position, and
  • Figure 5 is a view similar to Figure 4, in a second position.

Les figures représentent un dispositif générateur de vibrations 1 équipant la table 2 d'une presse de fabrication de produits en béton tels que des pavés, blocs, éléments de bordures et similaires.The figures represent a vibration generator device 1 equipping table 2 with a press for manufacturing concrete products such as pavers, blocks, edge elements and the like.

La table 2 repose sur le bâti 3 de la presse par l'intermédiaire de plots souples 4 et comprend, fixés à sa face inférieure, deux carters 5 traversés chacun par quatre arbres 6 équipés de balourds 7. Ces arbres 6 sont répartis, sur chaque carter 5, en deux paires superposées, et sont deux à deux coaxiaux d'un carter 5 à l'autre.The table 2 rests on the frame 3 of the press by means of flexible studs 4 and comprises, fixed to its lower face, two casings 5 each traversed by four shafts 6 equipped with unbalances 7. These shafts 6 are distributed on each casing 5, in two superimposed pairs, and are two to two coaxial from one casing 5 to another.

Les arbres 6 sont reliés, par l'intermédiaire d'accouplements souples de type cardan 8, à des arbres d'entraînement 9, les arbres 6 et 9 constituant ainsi quatre lignes d'arbres réparties en deux paires superposées.The shafts 6 are connected, by means of flexible couplings of cardan type 8, to drive shafts 9, the shafts 6 and 9 thus constituting four lines of shafts distributed in two superposed pairs.

Quatre des arbres 9 comprennent des pignons 10 calé sur eux. Les pignons 10 de deux arbres 9 d'une même paire engrènent l'un avec l'autre.Four of the shafts 9 include pinions 10 wedged on them. The pinions 10 of two shafts 9 of the same pair mesh with each other.

Les pignons 10 sont logés dans un carter 11, solidaire du bâti de la presse, que traversent les arbres 9.The pinions 10 are housed in a casing 11, integral with the press frame, through which the shafts 9 pass.

Les carters 5 et 11 contiennent les paliers des arbres 6 et 9, et de l'huile pour la lubrification de ces paliers et des pignons 10.The housings 5 and 11 contain the bearings of the shafts 6 and 9, and oil for the lubrication of these bearings and of the pinions 10.

Deux des arbres 9, un pour chaque paire de ligne d'arbres, se prolongent au-delà du carter 11 et comprennent deux poulies crantées 12 calées sur eux. L'un de ces deux arbres 9 est relié, par l'intermédiaire d'un accouplement souple de type cardan, à un moteur d'entraînement 14, disposé coaxialement à l'arbre 9. Ce moteur est porté par un piètement fixé sur une embase 15.Two of the shafts 9, one for each pair of lines of shafts, extend beyond the casing 11 and include two toothed pulleys 12 wedged on them. One of these two shafts 9 is connected, by means of a flexible cardan coupling, to a drive motor 14, arranged coaxially with the shaft 9. This motor is carried by a base fixed on a base 15.

Entre le moteur 14 et le carter 11, sont placés deux leviers 16 reliés l'un à l'autre par une bielle supérieure 17, l'ensemble constituant un quadrilatère déformable.Between the motor 14 and the casing 11, two levers 16 are placed connected to each other by an upper rod 17, the assembly constituting a deformable quadrilateral.

Chaque levier 16 est placé latéralement par rapport aux arbres 6 et 9 et peut pivoter dans un plan perpendiculaire à ceux-ci.Each lever 16 is placed laterally with respect to the shafts 6 and 9 and can pivot in a plane perpendicular to them.

Les parties inférieures des leviers 16 sont montées dans des chapes aménagées par des parois 18 solidaires de l'embase 15.The lower parts of the levers 16 are mounted in yokes fitted by walls 18 integral with the base 15.

Les leviers 16 présentent la forme d'un V relativement fermé et à branches 16a,16b de longueurs inégales. Les branches 16a les plus courtes comprennent des poulies crantées folles 20, montées sur leur extrémité libre, et les branches 16b les plus longues, faisant nettement saillie au-delà des poulies 20, sont reliées à la bielle 17 au niveau de leurs extrémités.The levers 16 have the shape of a relatively closed V and with branches 16a, 16b of unequal lengths. The shortest branches 16a include idler pulleys 20, mounted on their free end, and the longest branches 16b, clearly protruding beyond the pulleys 20, are connected to the connecting rod 17 at their ends.

Une courroie crantée 21 est engagée, d'une part, autour des poulies 12 et, d'autre part, sur les poulies folles 20, qui constituent des poulies latérales de renvoi.A toothed belt 21 is engaged, on the one hand, around the pulleys 12 and, on the other hand, on the idler pulleys 20, which constitute lateral return pulleys.

Un vérin à double effet 25 est relié à l'un des leviers 16 et à l'embase 15, en étant monté pivotant par rapport à l'un et à l'autre.A double-acting cylinder 25 is connected to one of the levers 16 and to the base 15, while being pivotally mounted relative to one and to the other.

En pratique, les arbres 6 et 9 sont entraînés en rotation par le moteur 14, soit directement en ce qui concerne l'arbre 6 et l'arbre 9 auxquels il est directement relié, soit par l'intermédiaire des pignons 10 et de la courroie 21 pour les autres arbres.In practice, the shafts 6 and 9 are rotated by the motor 14, either directly with respect to the shaft 6 and the shaft 9 to which it is directly connected, or by means of the pinions 10 and the belt 21 for other trees.

Les pignons 10 permettent d'entraîner les arbres 6 et 9 de chaque paire de lignes d'arbres en sens inverse l'un de l'autre.The pinions 10 are used to drive the shafts 6 and 9 of each pair of shaft lines in opposite directions to one another.

Le vérin 25 permet de déplacer le châssis formé par les leviers 16 et par la bielle 17 dans un plan perpendiculaire aux arbres 6 et 9, et, donc, de faire varier la longueur de courroie 21 s'étendant entre les deux poulies crantées 12. Cette variation de longueur permet de déphaser les balourds 7 de la paire de lignes d'arbres supérieure par rapport à ceux de la paire de lignes d'arbres inférieure, de telle sorte que les balourds 7 peuvent être placés soit en phase soit en opposition de phase d'une paire à l'autre, permettant ainsi de moduler l'amplitude des vibrations transmises à la table 2, entre une valeur maximale et une valeur nulle.The jack 25 makes it possible to move the chassis formed by the levers 16 and by the connecting rod 17 in a plane perpendicular to the shafts 6 and 9, and, therefore, to vary the length of the belt 21 extending between the two toothed pulleys 12. This variation in length makes it possible to phase the unbalances 7 of the pair of upper shaft lines relative to those of the pair of lower shaft lines, so that the unbalances 7 can be placed either in phase or in opposition to phase from one pair to another, thus making it possible to modulate the amplitude of the vibrations transmitted to table 2, between a maximum value and a zero value.

Les deux leviers pivotants 16 et la bielle 17 ont une très faible inertie, et ne transmettent que des contraintes limitées à la courroie 21 lors de leur passage d'une position à l'autre. Ils permettent ainsi de limiter considérablement l'usure de la courroie 21 et assurent un positionnement précis des balourds 7 en opposition de phase.The two pivoting levers 16 and the connecting rod 17 have a very low inertia, and transmit only limited stresses to the belt 21 when they pass from one position to the other. They thus make it possible to considerably limit the wear of the belt 21 and ensure precise positioning of the unbalances 7 in phase opposition.

De plus, les mouvements opposés des deux leviers 16, sur un secteur de cercle, s'équilibrent, ce qui permet de réduire au minimum l'inertie du châssis engendrée par ces mouvements.In addition, the opposite movements of the two levers 16, on a sector of a circle, balance each other, which makes it possible to minimize the inertia of the chassis generated by these movements.

Il en résulte une usure très réduite de la courroie 21 et un positionnement précis des balourds 7 en opposition de phase.This results in very reduced wear of the belt 21 and a precise positioning of the unbalances 7 in phase opposition.

Le déphasage est rapide et la maintenance de la courroie 21 est limitée, de sorte que la cadence de production obtenue est élevée.The phase shift is rapid and the maintenance of the belt 21 is limited, so that the production rate obtained is high.

La longueur de la courroie 21 est maintenue sensiblement constante, quelle que soient la position de ces leviers 16, ce qui est propice à la longévité de la courroie 21 et à l'obtention d'un positionnement précis des balourds en opposition de phase.The length of the belt 21 is kept substantially constant, whatever the position of these levers 16, which is conducive to the longevity of the belt 21 and obtaining a precise positioning of the imbalances in phase opposition.

L'entraînement en rotation des arbres 6 et 9 d'une même paire au moyen des pignons 10 permet d'assurer un parfait maintien angulaire des balourds 7, au sein de cette paire.The rotational drive of the shafts 6 and 9 of the same pair by means of the pinions 10 ensures perfect angular support of the unbalances 7, within this pair.

La courroie 21 est engagée autour de deux poulies 12 seulement, a une longueur réduite et ne transmet aux arbres que la moitié de la puissance motrice, ce qui contribue également à limiter les risques d'usure et d'allongement.The belt 21 is engaged around only two pulleys 12, has a reduced length and transmits to the trees only half of the driving power, which also contributes to limiting the risks of wear and elongation.

Le moteur est éloigné de l'emplacement de moulage, et est donc isolé de l'ambiance poussiéreuse environnant la presse.The motor is far from the molding location, and is therefore isolated from the dusty environment surrounding the press.

Le dispositif 1 est compact et peut être intégré aisément à des machines existantes, moyennant des adaptations minimes.The device 1 is compact and can be easily integrated into existing machines, with minimal adaptations.

De plus, la température dans les carters 5 et 11 lors du fonctionnement reste faible et stable.In addition, the temperature in the casings 5 and 11 during operation remains low and stable.

Claims (5)

1 - Dispositif générateur de vibrations, notamment destiné à équiper la table d'une presse de fabrication de produits en béton, du type comprenant quatre lignes d'arbres parallèles (6,9), équipées de balourds (7) et réparties en deux paires superposées, et une courroie crantée (21) engagée, d'une part, autour de poulies crantées (12) calées sur les lignes d'arbres (6,9) et, d'autre part, sur des poulies latérales de renvoi (20) montées folles sur un châssis (16,17) déplaçable dans un plan perpendiculaire aux lignes d'arbres (6,9), le déplacement de ce châssis (16,17) permettant de déphaser les balourds (7) d'une paire de lignes d'arbres par rapport à ceux de la paire de lignes d'arbres superposée, de telle sorte que les balourds peuvent être placés soit en phase soit en opposition de phase d'une paire à l'autre, dispositif caractérisé en ce que : - chaque ligne d'arbre (6,9) comprend un pignon (10) calé sur elle, les pignons (10) de deux lignes d'arbres (6,9) d'une même paire de lignes d'arbres engrènant l'un avec l'autre ; - l'une seulement des deux lignes d'arbres (6,9) de chaque paire de lignes d'arbres comprend une poulie crantée (12) autour de laquelle est engagée la courroie (21), et - le châssis comportant les poulies de renvoi (20) est constitué par deux leviers latéraux (16) montés pivotants sur un bâti fixe (15), reliés l'un à l'autre par une bielle supérieure, l'ensemble constituant un quadrilatère déformable. 1 - Vibration generating device, in particular intended to equip the table with a press for manufacturing concrete products, of the type comprising four lines of parallel shafts (6,9), equipped with unbalances (7) and distributed in two pairs superimposed, and a toothed belt (21) engaged, on the one hand, around toothed pulleys (12) wedged on the shaft lines (6,9) and, on the other hand, on lateral return pulleys (20 ) mounted idly on a chassis (16,17) movable in a plane perpendicular to the lines of trees (6,9), the displacement of this chassis (16,17) making it possible to phase the unbalances (7) by a pair of shaft lines with respect to those of the pair of superimposed shaft lines, so that the unbalances can be placed either in phase or in phase opposition from one pair to the other, device characterized in that: - each shaft line (6,9) comprises a pinion (10) wedged on it, the pinions (10) of two lines of trees (6,9) of the same pair of lines of trees meshing with one with the other; only one of the two shaft lines (6,9) of each pair of shaft lines comprises a toothed pulley (12) around which the belt (21) is engaged, and - The chassis comprising the return pulleys (20) is constituted by two lateral levers (16) pivotally mounted on a fixed frame (15), connected to each other by an upper connecting rod, the assembly constituting a deformable quadrilateral . 2 - Dispositif selon la revendication 1, caractérisé en ce que le moteur d'entraînement (14) est directement relié à l'une des lignes d'arbres (6,9) comportant une poulie crantée (12) et n'est pas monté sur le châssis. 2 - Device according to claim 1, characterized in that the drive motor (14) is directly connected to one of the lines of shafts (6,9) comprising a toothed pulley (12) and is not mounted on the chassis. 3 - Dispositif selon la revendication 1 ou la revendication 2, caractérisé en ce que : - la table vibrante (2) comprend deux carters inférieurs (5) solidarisés à elle ; - chaque ligne d'arbres comprend deux arbres coaxiaux (6) équipés des balourds (7), dits "arbres vibreurs", montés chacun au travers de l'un de ces carters (5), et - les deux arbres vibreurs (6) sont reliés l'un à l'autre et au dispositif générateur de vibrations, par l'intermédiaire d'accouplements souples (8) du type cardan, à deux arbres coaxiaux (9), dits "arbres d'entraînement", permettant leur entraînement en rotation, dont un comporte l'un des pignons (10) précités. 3 - Device according to claim 1 or claim 2, characterized in that: - The vibrating table (2) comprises two lower housings (5) secured to it; each line of shafts comprises two coaxial shafts (6) fitted with unbalances (7), called "vibrating shafts", each mounted through one of these casings (5), and - the two vibrating shafts (6) are connected to each other and to the vibration generating device, by means of flexible couplings (8) of the gimbal type, with two coaxial shafts (9), called "shafts ", allowing them to rotate, one of which includes one of the aforementioned pinions (10). 4 - Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que le moteur (14) est disposé coaxialement à la ligne d'arbre (6,9) qu'il entraîne. 4 - Device according to one of claims 1 to 3, characterized in that the motor (14) is arranged coaxially with the shaft line (6,9) which it drives. 5 - Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que chaque levier (16) présente la forme d'un V relativement fermé et à branches (16a,16b) de longueurs inégales, la branche (16a) la plus courte comprenant la poulie folle (20) sur son extrémité libre, et la branche (16b) la plus longue étant reliée à la bielle articulée (17). 5 - Device according to one of claims 1 to 4, characterized in that each lever (16) has the shape of a relatively closed V and with branches (16a, 16b) of unequal lengths, the branch (16a) most short comprising the idler pulley (20) on its free end, and the longest branch (16b) being connected to the articulated connecting rod (17).
EP95420191A 1994-07-13 1995-07-06 Device for generating vibrations, particularly for a press-table used for the manufacture of concrete products Expired - Lifetime EP0692317B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9408931A FR2722444B1 (en) 1994-07-13 1994-07-13 VIBRATION DEVICE FOR A PRESS TABLE USED FOR THE MANUFACTURE OF CONCRETE PRODUCTS
FR9408931 1994-07-13

Publications (2)

Publication Number Publication Date
EP0692317A1 true EP0692317A1 (en) 1996-01-17
EP0692317B1 EP0692317B1 (en) 1997-08-06

Family

ID=9465537

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420191A Expired - Lifetime EP0692317B1 (en) 1994-07-13 1995-07-06 Device for generating vibrations, particularly for a press-table used for the manufacture of concrete products

Country Status (5)

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EP (1) EP0692317B1 (en)
AT (1) ATE156391T1 (en)
DE (1) DE69500519T2 (en)
ES (1) ES2105857T3 (en)
FR (1) FR2722444B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004069504A1 (en) * 2003-02-05 2004-08-19 Institut für Fertigteiltechnik und Fertigbau Weimar e.V. Device for moulding mixtures
WO2009012922A2 (en) 2007-07-24 2009-01-29 ThyssenKrupp Fördertechnik GmbH Unbalanced drive for screening machines

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006029241A1 (en) * 2006-06-26 2007-12-27 Gebr. Bellmer Gmbh Maschinenfabrik Device for generating vibrations
ES2383408B1 (en) * 2008-12-01 2013-04-29 Metalurgica Poyatos, S.A. MECHANISM FOR A VIBRATOR DEVICE AND VIBRATOR DEVICE

Citations (4)

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US4830597A (en) 1986-08-27 1989-05-16 Knauer Gmbh Maschinenfabrik Vibrator for a block molding machine
EP0400510A1 (en) 1989-06-02 1990-12-05 M.A.B. Apparatus with vibrating table for making concrete products
WO1992020467A1 (en) 1991-05-22 1992-11-26 Societe Materiels Vincent Vaillant Mvv S.A. Device allowing the control and action of vibratory effects on machines and materials particularly for the treatment of products intended to be vibrated, compressed and compacted
EP0600526A1 (en) 1992-12-03 1994-06-08 Antonio Poyatos Diaz Vibrating arrangement for machinery

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US2886976A (en) * 1956-07-13 1959-05-19 Norman L Dean System for converting rotary motion into unidirectional motion
DE8801315U1 (en) * 1988-02-03 1988-03-17 Hella Kg Hueck & Co, 4780 Lippstadt, De

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Publication number Priority date Publication date Assignee Title
US4830597A (en) 1986-08-27 1989-05-16 Knauer Gmbh Maschinenfabrik Vibrator for a block molding machine
EP0400510A1 (en) 1989-06-02 1990-12-05 M.A.B. Apparatus with vibrating table for making concrete products
WO1992020467A1 (en) 1991-05-22 1992-11-26 Societe Materiels Vincent Vaillant Mvv S.A. Device allowing the control and action of vibratory effects on machines and materials particularly for the treatment of products intended to be vibrated, compressed and compacted
EP0600526A1 (en) 1992-12-03 1994-06-08 Antonio Poyatos Diaz Vibrating arrangement for machinery

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004069504A1 (en) * 2003-02-05 2004-08-19 Institut für Fertigteiltechnik und Fertigbau Weimar e.V. Device for moulding mixtures
US7527487B2 (en) 2003-02-05 2009-05-05 Institut für Fertigteiltechnik und Fertigbau Weimar e.V. Device for moulding mixtures
WO2009012922A2 (en) 2007-07-24 2009-01-29 ThyssenKrupp Fördertechnik GmbH Unbalanced drive for screening machines
WO2009012922A3 (en) * 2007-07-24 2009-11-26 ThyssenKrupp Fördertechnik GmbH Unbalanced drive for screening machines
AU2008280515B2 (en) * 2007-07-24 2012-12-13 Flsmidth A/S Unbalanced drive for screening machines
US8925731B2 (en) 2007-07-24 2015-01-06 Thyssenkrupp Industrial Solutions Ag Unbalanced drive for screening machines

Also Published As

Publication number Publication date
FR2722444B1 (en) 1996-08-23
FR2722444A1 (en) 1996-01-19
DE69500519D1 (en) 1997-09-11
DE69500519T2 (en) 1998-02-12
EP0692317B1 (en) 1997-08-06
ES2105857T3 (en) 1997-10-16
ATE156391T1 (en) 1997-08-15

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