EP0692317B1 - 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 PDFInfo
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- EP0692317B1 EP0692317B1 EP95420191A EP95420191A EP0692317B1 EP 0692317 B1 EP0692317 B1 EP 0692317B1 EP 95420191 A EP95420191 A EP 95420191A EP 95420191 A EP95420191 A EP 95420191A EP 0692317 B1 EP0692317 B1 EP 0692317B1
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- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 238000006073 displacement reaction Methods 0.000 claims abstract description 3
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 230000010363 phase shift Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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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 underside, 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
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.
- 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.
- 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.
- 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
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
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
Les pignons 10 sont logés dans un carter 11, solidaire du bâti de la presse, que traversent les arbres 9.The
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
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
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
Chaque levier 16 est placé latéralement par rapport aux arbres 6 et 9 et peut pivoter dans un plan perpendiculaire à ceux-ci.Each
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
De plus, la température dans les carters 5 et 11 lors du fonctionnement reste faible et stable.In addition, the temperature in the
Claims (5)
- Vibration-generating device, intended in particular to equip the table of a press for manufacturing concrete products, of the type comprising four lines of parallel shafts (6,9), said lines being equipped with unbalanced masses (7) and divided into two superposed pairs, and a notched belt (21) engaged, on the one hand, around notched pulleys (12) keyed on the lines of shafts (6,9) and, on the other hand, on lateral return pulleys (20) mounted loosely on a displaceable chassis (16,17) in a plane perpendicular to the lines of shafts (6,9), the displacement of said chassis (16,17) permitting the unbalanced masses (7) of a pair of lines of shafts to be dephased in relation to the unbalanced masses of the superposed pair of shaft lines in such a way that the unbalanced masses can be placed either in phase or in antiphase from one pair to another, a device characterised in that:- each line of shafts (6,9) comprises a pinion (10) keyed on it, the pinions (10) of two shaft lines (6,9) of an identical pair of shaft lines meshing with one another;- one only of the two lines of shafts (6,9) of each pair of shaft lines comprises a notched pulley (12), around which the belt (21) is engaged, and- the chassis comprising the return pulleys (20) is constituted by two lateral levers (16) mounted so as to pivot on a fixed frame (15) and connected to one another by an upper connecting rod (17), the assembly constituting a deformable quadrilateral.
- Device according to Claim 1, characterised in that the drive motor (14) is directly connected to one of the lines of shafts (6,9) comprising a notched pulley (12) and is not mounted on the chassis.
- Device according to Claim 1 or Claim 2, characterised in that:- the vibrating table (2) comprises two lower casings (5) firmly secured to it;- each line of shafts comprises two coaxial shafts (6) equipped with unbalanced masses (7), so-called "vibrator shafts", each mounted so as to pass through one of said casings (5), and- the two vibrator shafts (6) are connected to one another and to the vibration-generating device by means of flexible couplings (8) of the cardan type having two coaxial shafts (9), so-called "drive shafts", permitting them to be driven in rotation, one of which comprises one of the aforementioned pinions (10).
- Device according to one of Claims 1 to 3, characterised in that the motor (14) is arranged coaxially with the shaft line (6,9) that it drives.
- Device according to one of Claims 1 to 4, characterised in that each lever (16) takes the form of a relatively closed V having branches (16a,16b) of unequal length, the shorter branch (16a) comprising the loose pulley (20) on its free end and the longer branch (16b) being connected to the articulated connecting rod (17).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9408931 | 1994-07-13 | ||
| FR9408931A FR2722444B1 (en) | 1994-07-13 | 1994-07-13 | VIBRATION DEVICE FOR A PRESS TABLE USED FOR THE MANUFACTURE OF CONCRETE PRODUCTS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0692317A1 EP0692317A1 (en) | 1996-01-17 |
| EP0692317B1 true 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)
| Country | Link |
|---|---|
| EP (1) | EP0692317B1 (en) |
| AT (1) | ATE156391T1 (en) |
| DE (1) | DE69500519T2 (en) |
| ES (1) | ES2105857T3 (en) |
| FR (1) | FR2722444B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE20301954U1 (en) | 2003-02-05 | 2003-04-24 | Institut für Fertigteiltechnik und Fertigbau Weimar e.V., 99423 Weimar | Device for shaping batches |
| DE102006029241A1 (en) * | 2006-06-26 | 2007-12-27 | Gebr. Bellmer Gmbh Maschinenfabrik | Device for generating vibrations |
| DE102007034512B3 (en) | 2007-07-24 | 2008-06-26 | ThyssenKrupp Fördertechnik GmbH | Drive device i.e. unbalance drive, for driving sieving body of sieving machine, has bearing units exclusively arranged at horizontal shafts in axis direction of shaft section between unbalance units and supported at crossbar |
| ES2383408B1 (en) * | 2008-12-01 | 2013-04-29 | Metalurgica Poyatos, S.A. | MECHANISM FOR A VIBRATOR DEVICE AND VIBRATOR DEVICE |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2886976A (en) * | 1956-07-13 | 1959-05-19 | Norman L Dean | System for converting rotary motion into unidirectional motion |
| DE3709112C1 (en) * | 1986-08-27 | 1988-01-28 | Knauer Maschf Gmbh | Vibrating device for a concrete block molding machine |
| DE8801315U1 (en) * | 1988-02-03 | 1988-03-17 | Hella KG Hueck & Co, 4780 Lippstadt | Vibrating conveyor |
| FR2647705B1 (en) * | 1989-06-02 | 1991-08-30 | Balbinot Ets | VIBRATING TABLE INSTALLATION FOR THE MANUFACTURE OF CONCRETE PRODUCTS |
| FR2676664B1 (en) * | 1991-05-22 | 1995-01-27 | Vaillant Materiels Vincent | DEVICE AUTHORIZING THE CONTROL AND ACTION OF VIBRATORY EFFECTS ON MACHINES INTENDED IN PARTICULAR FOR THE MANUFACTURE OF PRODUCTS INTENDED TO BE VIBRATED AND COMPACT. |
| ES1023151Y (en) * | 1992-12-03 | 1994-01-01 | Poyatos Diaz | VIBRATING DEVICE FOR MACHINERY. |
-
1994
- 1994-07-13 FR FR9408931A patent/FR2722444B1/en not_active Expired - Fee Related
-
1995
- 1995-07-06 ES ES95420191T patent/ES2105857T3/en not_active Expired - Lifetime
- 1995-07-06 EP EP95420191A patent/EP0692317B1/en not_active Expired - Lifetime
- 1995-07-06 AT AT95420191T patent/ATE156391T1/en not_active IP Right Cessation
- 1995-07-06 DE DE69500519T patent/DE69500519T2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE156391T1 (en) | 1997-08-15 |
| FR2722444A1 (en) | 1996-01-19 |
| FR2722444B1 (en) | 1996-08-23 |
| DE69500519T2 (en) | 1998-02-12 |
| ES2105857T3 (en) | 1997-10-16 |
| EP0692317A1 (en) | 1996-01-17 |
| DE69500519D1 (en) | 1997-09-11 |
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