EP1738033A1 - System for controlling and synchronising movements of two parts of a tool carried by a loader - Google Patents

System for controlling and synchronising movements of two parts of a tool carried by a loader

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Publication number
EP1738033A1
EP1738033A1 EP05757165A EP05757165A EP1738033A1 EP 1738033 A1 EP1738033 A1 EP 1738033A1 EP 05757165 A EP05757165 A EP 05757165A EP 05757165 A EP05757165 A EP 05757165A EP 1738033 A1 EP1738033 A1 EP 1738033A1
Authority
EP
European Patent Office
Prior art keywords
claw
called
movements
solenoid valve
handling member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05757165A
Other languages
German (de)
French (fr)
Other versions
EP1738033B1 (en
Inventor
Loïc MAILLEUX
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mailleux SA
Original Assignee
D'ETUDES ET D'INNOVATION DANS LE MATERIEL AGRICOLE (SEIMA) Ste
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by D'ETUDES ET D'INNOVATION DANS LE MATERIEL AGRICOLE (SEIMA) Ste filed Critical D'ETUDES ET D'INNOVATION DANS LE MATERIEL AGRICOLE (SEIMA) Ste
Publication of EP1738033A1 publication Critical patent/EP1738033A1/en
Application granted granted Critical
Publication of EP1738033B1 publication Critical patent/EP1738033B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/402—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors
    • E02F3/404—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with means for facilitating the loading thereof, e.g. conveyors comprising two parts movable relative to each other, e.g. for gripping
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
    • E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like

Definitions

  • the present invention relates to a system for controlling the synchronization of the movements of the different parts of a tool carried by a loader, in particular a front loader.
  • a front loader fitted to a tractor has a tool-carrying frame at its free end on which various tools can be locked.
  • some combine a claw with a material handling device, such as a bucket.
  • the opening or closing of the claw and the modification of the orientation of the bucket, that is to say its dumping or lifting cannot be carried out that successively and independently.
  • the fact that the movements of the different parts of a tool cannot be carried out simultaneously makes the operator waste time on work cycles which can be quite short.
  • the object of the invention is to solve these problems.
  • the invention relates to a system for controlling the synchronization of the movements of a claw and of a handling member such as a bucket, this claw and this handling member constituting a tool carried by a loader, the orientation of the handling member being activated by first control means, the opening and closing of the claw being controlled by second control means.
  • said control system comprises means for synchronizing the operation of said first and second control means, so that on the one hand the movements of opening of the claw and tipping of the handling member are are carried out simultaneously and that, on the other hand, the movements for closing the claw and lifting the handling member are also carried out simultaneously. Thanks to this arrangement, the movements of the two parts of the tool can be synchronized, that is to say performed at the same time.
  • the first control means are a double-acting hydraulic cylinder, called “tipping”
  • the second control means are a cylinder double-acting hydraulic, called “claw”
  • the two jacks are mounted in series on a hydraulic supply circuit, via a solenoid valve, so that when the solenoid valve is in the so-called “synchronization” position, the so-called chamber “claw opening” of the claw cylinder is in communication with hydraulic fluid with the so-called "lifting" chamber of the tipping cylinder
  • the solenoid valve can occupy two other positions, a so-called “neutral” position in which only the tipping cylinder is supplied with hydraulic liquid to allow only the movements of the handling member and a so-called “claw manipulation” position in which only the claw jack is supplied with hydraulic fluid to allow only the movements of said claw
  • said solenoid valve is electrically controlled by means of two separate push-buttons, the first called “synchronization” allowing the passage of said solenoid valve
  • FIG. 1 is a general diagram showing a control system according to the state of the art of a loader mounted on an agricultural tractor, this control system being in a position such that only the orientation of the bucket can be modified
  • - Figure 2 is a diagram similar to that of Figure 1, the control system being in a position allowing only the movement of the claw
  • - Figures 3, 4 and 5 are diagrams similar to that of Figure 1 but showing the control system according to the invention and which show different operating positions of this system, respectively a position in which the operation of the bucket and the claw are synchronized (Figure 3), a position in which only the movements of the bucket are authorized (figure 4) and a position in which only the movements of the claw are authorized (figure 5).
  • the reference T denotes an agricultural tractor equipped with a front loader C comprising, in the usual manner, an articulated stretcher B provided at its front end with a tool-carrying frame CP.
  • the loader has a pair of lifting cylinders VL (only one of which is visible in the front views corresponding to the figures), which allow the stretcher B to pivot around its axis of articulation X, so as to cause the lifting or lowering the tool O carried by the frame CP.
  • the tool O comprises a handling member 2 associated with a claw 3.
  • this handling member 2 is a bucket, that is to say a hollow tool or bucket.
  • the tool O can also be a silage tool in which the handling member 2 is a vertical flat frame provided at its base with a series of teeth or a fork manure in which the handling member 2 is also a bucket but very little concave also provided with teeth.
  • the member 2 was a bucket.
  • the loader C also includes a pair of tipping cylinders 1 (only one of which is visible in the figures which are front views), with double effect allowing the tool O to pivot relative to the stretcher B and around a axis Xi.
  • the jacks 1 constitute means for controlling the orientation of the bucket 2.
  • This jack 1 comprises a piston 10 secured to the tool holder frame CP and a cylinder 11 secured to the stretcher B.
  • This jack 1 also has a small chamber 110 (on the side of the piston rod 10) and a large opposite chamber 111.
  • the tractor T is equipped with low and high pressure hydraulic sources, respectively BP (atmospheric pressure) and HP (pressure of the order 1.5.10 7 to 2.10 7 Pa).
  • Line 8 corresponds to the supply of high pressure liquid and line 9 to return to the tank (low pressure line).
  • the conduits 8 and 9 are connected, via a control valve 5 with three positions and an electrovalve EV, on the one hand to the small chamber 110 of the tipping cylinder 1 and on the other hand to its large chamber 111.
  • the connections between the control valve 5 and the solenoid valve EV are referenced respectively 81 and 82 and the connections between the solenoid valve EV and the chambers 111 and 110 are referenced respectively 83 and 84.
  • the small chamber 110 will be conventionally called “lifting chamber”, because the supply of pressurized liquid in this chamber causes the bucket 2 to be raised.
  • the claw 3 is equipped with a pair of jacks 4, hereinafter called “claw jacks" (only one of which is visible in the figures in front view). These jacks constitute means for controlling the opening and closing of the claw 3.
  • This double-acting jack 4 comprises a piston 40 integral with the claw
  • the jack 4 also has a small chamber 410 on the piston side and a large chamber 411 on the opposite side.
  • the conduits 8 and 9 are connected to the claw jack 4, via the control valve 5 and the EV solenoid valve.
  • the connections between the EV solenoid valve and the chambers 410 and 411 are respectively referenced 86 and 85.
  • the control valve 5 being in the reverse position 52 - the EV solenoid valve being always in the same position - it is possible to bring the liquid into the large chamber 411 of the jack 4 and thus to close the claw 3.
  • the small chamber 410 will be conventionally called “claw opening chamber", because the supply of pressurized liquid in this chamber causes the claw to open 3.
  • the solenoid valve EV is controlled by a electric switch 700, itself actuated by a push button 70, called “claw activation”.
  • the large-scale detail which appears in a circle at the top left of the figures represents a part of the control handle 7 which is provided with the tractor. This handle 7 makes it possible to actuate the control distributor 5.
  • the push button 70 is mounted on the handle 7.
  • FIG. 3 illustrates the control system according to the invention which makes it possible to solve this problem.
  • the tipping cylinder 4 and the claw cylinder 1 are mounted in series on the hydraulic supply circuit, via a three-position solenoid valve 6 which replaces the prior art EV solenoid valve.
  • the solenoid valve 6 can be placed in the two so-called positions
  • the solenoid valve 6 can also be brought into a third position called “synchronization" referenced 63 and illustrated in Figure 3, in which the claw cylinder 4 and the cylinder tipping 1 are mounted in series on the hydraulic supply circuit. More specifically, the claw opening chamber 410 of the claw cylinder 4 is in communication with hydraulic fluid with the lifting chamber 110 of the cylinder 1, via the solenoid valve 6.
  • the solenoid valve 6 is in this synchronization position 63 and that the control distributor 5 is in the active position 51, the hydraulic fluid under pressure is brought into the large chamber 111 of the jack 1.
  • the liquid present in the lifting chamber 110 is expelled in the direction of the solenoid valve 6 then is returned via the line 86 to the opening chamber of the claw 410 of the jack 4, before returning to the low pressure tank.
  • the opening of the claw 3 is synchronized with the tipping or dumping of the bucket 2.
  • the movement of the control valve 5 in the reverse position 52 causes the reverse circulation of the hydraulic fluid and the synchronization of the closing of the claw 3 with the lifting of the bucket 2.
  • the solenoid valve 6 is controlled by an electric switch 700 called "claw actuation", in accordance with what has been described previously for the EV solenoid valve and which makes it possible to bring the solenoid valve 6 from neutral position 61 to position 62 of claw handling.
  • the solenoid valve 6 is also controlled by a second electrical switch 710 called "synchronization", itself actuated by a push button 71 carried by the control handle 7.
  • the synchronization switch 710 makes it possible to bring the solenoid valve 6 from neutral position 61 to synchronization position 63.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Feeding Of Workpieces (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Automatic Assembly (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

The invention relates to a system for controlling and synchronising movements of a gripper (3) and a handling member (2) such as a bucket which jointly form a tool (O) carried by a loader (C), wherein the handling member (2) is orientable by first control means (1) and the opening and closing of the gripper (3) is controlled by second control means (4). The inventive system is characterised in that it comprises means (6) for synchronising the operation of said first and second control means (1, 4) in such a way that the opening movements of the gripper (3) and the dumping of the handling member (2) are concomitantly carried out and the closing movements of the gripper (3) and the lifting of the handling member (2) are also concomitantly carried out. The invention can be used for trucks.

Description

SYSTEME DE COMMANDE DE LA SYNCHRONISATION DES MOUVEMENTS DES DEUX PARTIES D'UN OUTIL PORTE PAR UN CHARGEURSYSTEM FOR CONTROLLING THE SYNCHRONIZATION OF THE MOVEMENTS OF THE TWO PARTS OF A TOOL CARRIED BY A LOADER
La présente invention concerne un système de commande de la synchronisation des mouvements des différentes parties d'un outil porté par un chargeur, notamment un chargeur frontal. Un chargeur frontal équipant un tracteur présente à son extrémité libre un cadre porte-outil sur lequel peuvent être verrouillés divers outils. Parmi ces outils, certains combinent une griffe avec un organe de manutention de matières, tel qu'une benne. Dans les systèmes de commande connus de l'état de la technique, l'ouverture ou la fermeture de la griffe et la modification de l'orientation de la benne, c'est-à-dire son déversement ou son relevage ne peuvent être effectuées que successivement et de façon indépendante. Le fait que les mouvements des différentes parties d'un outil ne puissent être effectués simultanément fait perdre du temps à l'opérateur sur des cycles de travail qui peuvent être assez courts. L'invention a pour obj ectif de résoudre ces problèmes. A cet effet, l'invention concerne un système de commande de la synchronisation des mouvements d'une griffe et d'un organe de manutention tel qu'une benne, cette griffe et cet organe de manutention constituant un outil porté par un chargeur, l'orientation de l'organe de manutention étant activée par des premiers moyens de commande, l'ouverture et la fermeture de la griffe étant commandées par des seconds moyens de commande. Conformément à l'invention, ledit système de commande comprend des moyens de synchronisation du fonctionnement desdits premier et second moyens de commande, de sorte que d'une part les mouvement d'ouverture de la griffe et de bennage de l'organe de manutention se font concomitamment et que d'autre part les mouvements de fermeture de la griffe et de relevage de l'organe de manutention se font également concomitamment. Grâce à cet arrangement, les mouvements des deux parties de l'outil peuvent être synchronisés, c'est-à-dire effectués en même temps. Selon d'autres caractéristiques avantageuses et non limitatives de l'invention, prise seule ou en combinaison : les premiers moyens de commande sont un vérin hydraulique à double effet, dit de "bennage", les seconds moyens de commande sont un vérin hydraulique à double effet, dit de "griffe", et les deux vérins sont montés en série sur un circuit d'alimentation hydraulique, via une électrovanne, de sorte que lorsque l'électrovanne est en position dite de "synchronisation", la chambre dite "d'ouverture de griffe" du vérin de griffe est en communication de liquide hydraulique avec la chambre dite "de relevage" du vérin de bennage ; l'électrovanne peut occuper deux autres positions, une position dite "neutre" dans laquelle seul le vérin de bennage est alimenté en liquide hydraulique pour autoriser uniquement les mouvements de l'organe de manutention et une position dite de "manipulation de griffe" dans laquelle seul le vérin de griffe est alimenté en liquide hydraulique pour autoriser uniquement les mouvements de ladite griffe ; ladite électrovanne est commandée électriquement au moyen de deux boutons-poussoirs distincts, le premier dit de "synchronisation" permettant le passage de ladite électrovanne de la position neutre à la position de synchronisation et le second dit "d'activation de griffe" permettant le passage de la position neutre à la position de manipulation de griffe. D'autres caractéristiques et avantages de l'invention apparaîtront de la description qui va maintenant en être faite, en référence aux dessins annexés, qui en représentent, à titre d'exemple non limitatif, un mode de réalisation préféré. Sur ces dessins : - la figure 1 est un schéma général représentant un système de commande conforme à l'état de la technique d'un chargeur monté sur un tracteur agricole, ce système de commande étant dans une position telle que seule l'orientation de la benne peut être modifiée, - la figure 2 est un schéma similaire à celui de la figure 1, le système de commande étant dans une position autorisant uniquement le mouvement de la griffe, - les figures 3, 4 et 5 sont des schémas similaires à celui de la figure 1 mais représentant le système de commande conforme à l'invention et qui montrent différentes positions de fonctionnement de ce système, respectivement une position dans laquelle le fonctionnement de la benne et de la griffe sont synchronisés (figure 3), une position dans laquelle seuls les mouvements de la benne sont autorisés (figure 4) et une position dans laquelle seuls les mouvements de la griffe sont autorisés (figure 5). Sur les figures, on a désigné par la référence T un tracteur agricole équipé d'un chargeur frontal C comportant, de manière usuelle, un brancard articulé B pourvu à son extrémité avant d'un cadre porte-outil CP. Le chargeur comporte une paire de vérins de levage VL (dont un seul est visible sur les vues de face correspondant aux figures), qui permettent de faire pivoter le brancard B autour de son axe d'articulation X, de façon à provoquer le levage ou l'abaissement de l'outil O porté par le cadre CP. L'outil O comprend un organe de manutention 2 associé à une griffe 3. Sur les figures, cet organe de manutention 2 est une benne, c'est-à- dire un outil creux ou godet. Selon d'autres variantes de réalisation non représentées sur les figures, l'outil O peut également être un outil de désilage dans lequel l'organe de manutention 2 est un cadre plat vertical muni à sa base d'une série de dents ou une fourche à fumier dans laquelle l'organe de manutention 2 est également une benne mais très peu concave également munie de dents. Dans la suite de la description et à des fins de simplification, on a considéré que l'organe 2 était une benne. Le chargeur C comporte également une paire de vérins de bennage 1 (dont un seul est visible sur les figures qui sont des vues de face), à double effet permettant de faire pivoter l'outil O par rapport au brancard B et autour d'un axe Xi. Les vérins 1 constituent des moyens de commande de l'orientation de la benne 2. Ce vérin 1 comprend un piston 10 solidaire du cadre porte-outil CP et un cylindre 11 solidaire du brancard B. Ce vérin 1 présente en outre une petite chambre 110 (du côté de la tige de piston 10) et une grande chambre opposée 111. De manière usuelle, le tracteur T est équipé de sources hydrauliques de basse et de haute pression, respectivement BP (pression atmosphérique) et HP (pression de l'ordre de 1,5.107 à 2.107 Pa). Le conduit 8 correspond à l'amenée de liquide haute pression et le conduit 9 au retour au réservoir (ligne basse pression). Les conduits 8 et 9 sont connectés, via un distributeur de commande 5 à trois positions et une électrovanne EV, d'une part à la petite chambre 110 du vérin de bennage 1 et d'autre part à sa grande chambre 111. Les connexions entre le distributeur de commande 5 et l'électrovanne EV sont référencées respectivement 81 et 82 et les connexions entre l'électrovanne EV et les chambres 111 et 110 sont référencées respectivement 83 et 84. Lorsque le distributeur de commande 5 est dans l'état illustré sur la figure 1 (position dite "neutre" référencée 50), les chambres 110 et 111 sont isolées des sources hydrauliques, le liquide ne pouvant ni s'en échapper, ni y pénétrer. Pour provoquer le bennage de la benne 2, c'est-à-dire son basculement vers le bas autour de l'axe Xi afin de déverser son contenu, on place l'électrovanne EV dans la position dite "neutre" représentée sur la figure 1 et le distributeur de commande 5 dans la position dite "active" référencée 51. Ceci a pour effet d'amener du liquide à haute pression dans la grande chambre 111 du vérin 1, tandis que la petite chambre 110 est reliée au réservoir de liquide basse pression. Le piston 10 est déplacé jusqu'à la position représentée sur la figure 3 et la benne 2 est inclinée. Le déplacement du distributeur de commande 5 en position inverseThe present invention relates to a system for controlling the synchronization of the movements of the different parts of a tool carried by a loader, in particular a front loader. A front loader fitted to a tractor has a tool-carrying frame at its free end on which various tools can be locked. Among these tools, some combine a claw with a material handling device, such as a bucket. In the control systems known from the prior art, the opening or closing of the claw and the modification of the orientation of the bucket, that is to say its dumping or lifting cannot be carried out that successively and independently. The fact that the movements of the different parts of a tool cannot be carried out simultaneously makes the operator waste time on work cycles which can be quite short. The object of the invention is to solve these problems. To this end, the invention relates to a system for controlling the synchronization of the movements of a claw and of a handling member such as a bucket, this claw and this handling member constituting a tool carried by a loader, the orientation of the handling member being activated by first control means, the opening and closing of the claw being controlled by second control means. According to the invention, said control system comprises means for synchronizing the operation of said first and second control means, so that on the one hand the movements of opening of the claw and tipping of the handling member are are carried out simultaneously and that, on the other hand, the movements for closing the claw and lifting the handling member are also carried out simultaneously. Thanks to this arrangement, the movements of the two parts of the tool can be synchronized, that is to say performed at the same time. According to other advantageous and non-limiting characteristics of the invention, taken alone or in combination: the first control means are a double-acting hydraulic cylinder, called "tipping", the second control means are a cylinder double-acting hydraulic, called "claw", and the two jacks are mounted in series on a hydraulic supply circuit, via a solenoid valve, so that when the solenoid valve is in the so-called "synchronization" position, the so-called chamber "claw opening" of the claw cylinder is in communication with hydraulic fluid with the so-called "lifting" chamber of the tipping cylinder; the solenoid valve can occupy two other positions, a so-called "neutral" position in which only the tipping cylinder is supplied with hydraulic liquid to allow only the movements of the handling member and a so-called "claw manipulation" position in which only the claw jack is supplied with hydraulic fluid to allow only the movements of said claw; said solenoid valve is electrically controlled by means of two separate push-buttons, the first called "synchronization" allowing the passage of said solenoid valve from the neutral position to the synchronization position and the second said "claw activation" allowing the passage from the neutral position to the claw handling position. Other characteristics and advantages of the invention will appear from the description which will now be made of it, with reference to the appended drawings, which represent, by way of nonlimiting example, a preferred embodiment. In these drawings: - Figure 1 is a general diagram showing a control system according to the state of the art of a loader mounted on an agricultural tractor, this control system being in a position such that only the orientation of the bucket can be modified, - Figure 2 is a diagram similar to that of Figure 1, the control system being in a position allowing only the movement of the claw, - Figures 3, 4 and 5 are diagrams similar to that of Figure 1 but showing the control system according to the invention and which show different operating positions of this system, respectively a position in which the operation of the bucket and the claw are synchronized (Figure 3), a position in which only the movements of the bucket are authorized (figure 4) and a position in which only the movements of the claw are authorized (figure 5). In the figures, the reference T denotes an agricultural tractor equipped with a front loader C comprising, in the usual manner, an articulated stretcher B provided at its front end with a tool-carrying frame CP. The loader has a pair of lifting cylinders VL (only one of which is visible in the front views corresponding to the figures), which allow the stretcher B to pivot around its axis of articulation X, so as to cause the lifting or lowering the tool O carried by the frame CP. The tool O comprises a handling member 2 associated with a claw 3. In the figures, this handling member 2 is a bucket, that is to say a hollow tool or bucket. According to other alternative embodiments not shown in the figures, the tool O can also be a silage tool in which the handling member 2 is a vertical flat frame provided at its base with a series of teeth or a fork manure in which the handling member 2 is also a bucket but very little concave also provided with teeth. In the following description and for simplification purposes, it has been considered that the member 2 was a bucket. The loader C also includes a pair of tipping cylinders 1 (only one of which is visible in the figures which are front views), with double effect allowing the tool O to pivot relative to the stretcher B and around a axis Xi. The jacks 1 constitute means for controlling the orientation of the bucket 2. This jack 1 comprises a piston 10 secured to the tool holder frame CP and a cylinder 11 secured to the stretcher B. This jack 1 also has a small chamber 110 (on the side of the piston rod 10) and a large opposite chamber 111. Usually, the tractor T is equipped with low and high pressure hydraulic sources, respectively BP (atmospheric pressure) and HP (pressure of the order 1.5.10 7 to 2.10 7 Pa). Line 8 corresponds to the supply of high pressure liquid and line 9 to return to the tank (low pressure line). The conduits 8 and 9 are connected, via a control valve 5 with three positions and an electrovalve EV, on the one hand to the small chamber 110 of the tipping cylinder 1 and on the other hand to its large chamber 111. The connections between the control valve 5 and the solenoid valve EV are referenced respectively 81 and 82 and the connections between the solenoid valve EV and the chambers 111 and 110 are referenced respectively 83 and 84. When the control valve 5 is in the state illustrated in FIG. 1 (so-called "neutral" position referenced 50), the chambers 110 and 111 are isolated from the hydraulic sources, the liquid being able neither to escape therefrom, nor to penetrate there. To cause the tipping of the bucket 2, that is to say its tilting down around the axis Xi in order to discharge its contents, the electrovalve EV is placed in the so-called "neutral" position shown in the figure 1 and the control distributor 5 in the so-called "active" position referenced 51. This has the effect of bringing high-pressure liquid into the large chamber 111 of the jack 1, while the small chamber 110 is connected to the liquid reservoir low pressure. The piston 10 is moved to the position shown in Figure 3 and the bucket 2 is tilted. Moving the control valve 5 to the reverse position
(référencée 52) permet d'amener le liquide à haute pression dans la petite chambre 110 du vérin 1, ce qui provoque la rétraction du piston 10 et le relevage de la benne(referenced 52) makes it possible to bring the high pressure liquid into the small chamber 110 of the jack 1, which causes the retraction of the piston 10 and the lifting of the bucket
2 vers sa position d'origine. Dans la suite de la description et des revendications, la petite chambre 110 sera conventionnellement dénommée "chambre de relevage", car l'amenée de liquide sous pression dans cette chambre provoque le relevage de la benne 2. La griffe 3 est équipée d'une paire de vérins 4, dénommés ci-après "vérins de griffe" (dont un seul est visible sur les figures en vue de face). Ces vérins constituent des moyens de commande de l'ouverture et de la fermeture de la griffe 3. Ce vérin 4 à double effet comprend un piston 40 solidaire de la griffe2 to its original position. In the following description and claims, the small chamber 110 will be conventionally called "lifting chamber", because the supply of pressurized liquid in this chamber causes the bucket 2 to be raised. The claw 3 is equipped with a pair of jacks 4, hereinafter called "claw jacks" (only one of which is visible in the figures in front view). These jacks constitute means for controlling the opening and closing of the claw 3. This double-acting jack 4 comprises a piston 40 integral with the claw
3 et un cylindre 41 solidaire de la partie supérieure de la benne 2. Le vérin 4 présente en outre une petite chambre 410 du côté piston et une grande chambre 411, du côté opposé. Les conduits 8 et 9 sont connectés au vérin de griffe 4, via le distributeur de commande 5 et l'électrovanne EV. Les connexions entre l'électrovanne EV et les chambres 410 et 411 sont référencées respectivement 86 et 85. Lorsque l'électrovanne EV est dans la position dite de "manipulation de griffe" représentée sur la figure 2 et le distributeur de commande 5 est en position active 51, il est possible d'amener du liquide haute pression dans la petite chambre 410, via les connexions 81 et 86 ce qui a pour effet de rétracter le piston 40 et de permettre l'ouverture de la griffe 3. Inversement, le distributeur de commande 5 étant dans la position inverse 52 - l'électrovanne EV étant toujours dans la même position - il est possible d'amener le liquide dans la grande chambre 411 du vérin 4 et ainsi de fermer la griffe 3. Dans la suite de la description et des revendications, la petite chambre 410 sera conventionnellement dénommée "chambre d'ouverture de griffe", car l'amenée de liquide sous pression dans cette chambre provoque l'ouverture de la griffe 3. L'électrovanne EV est pilotée par un interrupteur électrique 700, lui- même actionné par un bouton-poussoir 70, dit "d'activation de griffe". Le détail à grande échelle qui figure dans un cercle en haut et à gauche des figures représente une partie de la poignée de commande 7 dont est pourvu le tracteur. Cette poignée 7 permet d'actionner le distributeur de commande 5. Le bouton-poussoir 70 est monté sur la poignée 7. D'autres boutons-poussoirs 72, 73 permettent d'actionner les différents organes de manœuvre du chargeur et notamment le vérin de levage VL du chargeur C. Avec un tel système de commande, l'opérateur qui souhaite déverser le contenu de la benne 2 dans une remorque par exemple, (le chargeur C étant en position haute), doit appuyer et maintenir enfoncé le bouton poussoir 70 puis pousser la poignée de commande 7 du distributeur de commande 5 pour que la griffe 3 s'ouvre. Il doit ensuite relâcher le bouton-poussoir 70 de sorte que l'interrupteur 700 est ouvert et que l'électrovanne EV se trouve en position neutre et continuer de pousser la poignée 7 pour obtenir le déversement de la benne 2. L'opérateur doit donc décomposer les deux opérations d'ouverture de la griffe 3 et de déversement de la benne 2. La figure 3 illustre le système de commande conforme à l'invention qui permet de résoudre ce problème. Tous les éléments communs avec le dispositif de l'état de la technique portent les mêmes références numériques. Conformément à l'invention, le vérin de bennage 4 et le vérin de griffe 1 sont montés en série sur le circuit d'alimentation hydraulique, via une électrovanne 6 à trois positions qui remplace l'électrovanne EV de l'état de la technique. L'électrovanne 6 peut être placée dans les deux positions dites3 and a cylinder 41 secured to the upper part of the bucket 2. The jack 4 also has a small chamber 410 on the piston side and a large chamber 411 on the opposite side. The conduits 8 and 9 are connected to the claw jack 4, via the control valve 5 and the EV solenoid valve. The connections between the EV solenoid valve and the chambers 410 and 411 are respectively referenced 86 and 85. When the EV solenoid valve is in the position called "claw manipulation" shown in FIG. 2 and the control valve 5 is in active position 51, it is possible to bring high pressure liquid into the small chamber 410, via the connections 81 and 86, which has the effect of retracting the piston 40 and allowing the claw 3 to open. Conversely, the control valve 5 being in the reverse position 52 - the EV solenoid valve being always in the same position - it is possible to bring the liquid into the large chamber 411 of the jack 4 and thus to close the claw 3. In the following description and claims, the small chamber 410 will be conventionally called "claw opening chamber", because the supply of pressurized liquid in this chamber causes the claw to open 3. The solenoid valve EV is controlled by a electric switch 700, itself actuated by a push button 70, called "claw activation". The large-scale detail which appears in a circle at the top left of the figures represents a part of the control handle 7 which is provided with the tractor. This handle 7 makes it possible to actuate the control distributor 5. The push button 70 is mounted on the handle 7. Other push buttons 72, 73 make it possible to actuate the various operating members of the loader and in particular the actuator. VL lifting of the loader C. With such a control system, the operator who wishes to dump the contents of the bucket 2 in a trailer for example, (the loader C being in the high position), must press and hold down the push button 70 then push the control handle 7 of the control valve 5 so that the claw 3 opens. He must then release the push button 70 so that the switch 700 is open and the solenoid valve EV is in the neutral position and continue to push the handle 7 to obtain the dumping of the bucket 2. The operator must therefore decompose the two operations of opening the claw 3 and dumping the skip 2. FIG. 3 illustrates the control system according to the invention which makes it possible to solve this problem. All the elements common to the device of the state of the art bear the same numerical references. According to the invention, the tipping cylinder 4 and the claw cylinder 1 are mounted in series on the hydraulic supply circuit, via a three-position solenoid valve 6 which replaces the prior art EV solenoid valve. The solenoid valve 6 can be placed in the two so-called positions
"neutre" (référencée 61) et "de manipulation de griffe" (référencée 62) telles qu'elles ont été définies précédemment pour l'électrovanne EV. Ces positions sont illustrées respectivement sur les figures 4 et 5. L'électrovanne 6 peut en outre être amenée dans une troisième position dite "de synchronisation" référencée 63 et illustrée sur la figure 3, dans laquelle le vérin de griffe 4 et le vérin de bennage 1 sont montés en série sur le circuit d'alimentation hydraulique. Plus précisément, la chambre d'ouverture de griffe 410 du vérin de griffe 4 est en communication de liquide hydraulique avec la chambre de relevage 110 du vérin 1 , via l'électrovanne 6. Lorsque l'électrovanne 6 est dans cette position de synchronisation 63 et que le distributeur de commande 5 est en position active 51, on amène le liquide hydraulique sous pression dans la grande chambre 111 du vérin 1. Le liquide présent dans la chambre de relevage 110 est chassé en direction de l'électrovanne 6 puis est renvoyé par la canalisation 86 à la chambre d'ouverture du griffe 410 du vérin 4, avant de retourner vers le réservoir de basse pression. Ainsi, l'ouverture de la griffe 3 est synchronisée avec le bennage ou déversement de la benne 2. Le déplacement du distributeur de commande 5 dans la position inverse 52 entraîne la circulation inverse du liquide hydraulique et la synchronisation de la fermeture de la griffe 3 avec le relevage de la benne 2. L'électrovanne 6 est pilotée par un interrupteur électrique 700 dit "d'actionnement de griffe", conforme à ce qui a été décrit précédemment pour l'électrovanne EV et qui permet d'amener l'électrovanne 6 de la position neutre 61 à la position 62 de manipulation de griffe. L'électrovanne 6 est en outre pilotée par un second interrupteur électrique 710 dit "de synchronisation", lui-même actionné par un bouton-poussoir 71 porté par la poignée de commande 7. L'interrupteur de synchronisation 710 permet d'amener l'électrovanne 6 de la position neutre 61 à la position de synchronisation 63. Avec le système de commande conforme à l'invention, l'opérateur qui souhaite déverser le contenu de la benne 2 dans une remorque par exemple, (le chargeur C étant en position haute) n'a plus qu'à effectuer une seule opération, à savoir maintenir enfoncé le bouton-poussoir 71 et pousser la poignée de commande 7 du distributeur de commande 5, pour que simultanément la griffe 3 s'ouvre et la benne 2 se déverse. "neutral" (referenced 61) and "claw manipulation" (referenced 62) as defined above for the EV solenoid valve. These positions are illustrated respectively in Figures 4 and 5. The solenoid valve 6 can also be brought into a third position called "synchronization" referenced 63 and illustrated in Figure 3, in which the claw cylinder 4 and the cylinder tipping 1 are mounted in series on the hydraulic supply circuit. More specifically, the claw opening chamber 410 of the claw cylinder 4 is in communication with hydraulic fluid with the lifting chamber 110 of the cylinder 1, via the solenoid valve 6. When the solenoid valve 6 is in this synchronization position 63 and that the control distributor 5 is in the active position 51, the hydraulic fluid under pressure is brought into the large chamber 111 of the jack 1. The liquid present in the lifting chamber 110 is expelled in the direction of the solenoid valve 6 then is returned via the line 86 to the opening chamber of the claw 410 of the jack 4, before returning to the low pressure tank. Thus, the opening of the claw 3 is synchronized with the tipping or dumping of the bucket 2. The movement of the control valve 5 in the reverse position 52 causes the reverse circulation of the hydraulic fluid and the synchronization of the closing of the claw 3 with the lifting of the bucket 2. The solenoid valve 6 is controlled by an electric switch 700 called "claw actuation", in accordance with what has been described previously for the EV solenoid valve and which makes it possible to bring the solenoid valve 6 from neutral position 61 to position 62 of claw handling. The solenoid valve 6 is also controlled by a second electrical switch 710 called "synchronization", itself actuated by a push button 71 carried by the control handle 7. The synchronization switch 710 makes it possible to bring the solenoid valve 6 from neutral position 61 to synchronization position 63. With the control system according to the invention, the operator who wishes to dump the contents of the bucket 2 into a trailer for example, (the loader C being in the high position) only has to carry out a single operation, namely keep pressed the push button 71 and push the control handle 7 of the control valve 5, so that simultaneously the claw 3 opens and the bucket 2 pours.

Claims

REVENDICATIONS
1. Système de commande de la synchronisation des mouvements d'une griffe (3) et d'un organe de manutention (2) tel qu'une benne, cette griffe (3) et cet organe de manutention (2) constituant un outil (O) porté par un chargeur (C), l'orientation de l'organe de manutention (2) étant activée par des premiers moyens de commande (1), l'ouverture et la fermeture de la griffe (3) étant commandées par des seconds moyens de commande (4), caractérisé en ce qu'il comprend des moyens de synchronisation (6) du fonctionnement desdits premier et second moyens de commande (1), (4), de sorte que d'une part les mouvements d'ouverture de la griffe (3) et de bennage de l'organe de manutention (2) se font concomitamment et que d'autre part les mouvements de fermeture de la griffe (3) et de relevage de l'organe de manutention (2) se font également concomitamment. 1. System for controlling the synchronization of the movements of a claw (3) and of a handling member (2) such as a bucket, this claw (3) and this handling member (2) constituting a tool ( O) carried by a loader (C), the orientation of the handling member (2) being activated by first control means (1), the opening and closing of the claw (3) being controlled by second control means (4), characterized in that it comprises synchronization means (6) of the operation of said first and second control means (1), (4), so that on the one hand the movements of opening of the claw (3) and tipping of the handling member (2) are carried out concomitantly and that, on the other hand, the movements of closing the claw (3) and lifting of the handling member (2) are also done concomitantly.
2. Système de commande selon la revendication 1, caractérisé en ce que les premiers moyens de commande (1) sont un vérin hydraulique à double effet, dit de "bennage" et les seconds moyens de commande (4) sont un vérin hydraulique à double effet, dit de "griffe", et en ce que les deux vérins (1) et (4) sont montés en série sur un circuit d'alimentation hydraulique, via une électrovanne (6), de sorte que lorsque l'électrovanne (6) est en position (63) dite de "synchronisation", la chambre (410) dite "d'ouverture de griffe" du vérin de griffe (4) est en communication de liquide hydraulique avec la chambre (110) dite "de relevage" du vérin de bennage (1). 2. Control system according to claim 1, characterized in that the first control means (1) are a double-acting hydraulic cylinder, called "tipping" and the second control means (4) are a double hydraulic cylinder effect, called "claw", and in that the two jacks (1) and (4) are mounted in series on a hydraulic supply circuit, via a solenoid valve (6), so that when the solenoid valve (6 ) is in position (63) called "synchronization", the chamber (410) called "claw opening" of the claw cylinder (4) is in communication with hydraulic fluid with the chamber (110) called "lifting" the tipping cylinder (1).
3. Système de commande selon la revendication 2, caractérisé en ce que l'électrovanne (6) peut occuper deux autres positions, une position (61) dite "neutre" dans laquelle seul le vérin de bennage (1) est alimenté en liquide hydraulique pour autoriser uniquement les mouvements de l'organe de manutention (2) et une position (62) dite de "manipulation de griffe" dans laquelle seul le vérin de griffe (4) est alimenté en liquide hydraulique pour autoriser uniquement les mouvements de ladite griffe (3). 3. Control system according to claim 2, characterized in that the solenoid valve (6) can occupy two other positions, a position (61) called "neutral" in which only the tipping cylinder (1) is supplied with hydraulic liquid to allow only the movements of the handling member (2) and a position (62) called "claw manipulation" in which only the claw cylinder (4) is supplied with hydraulic liquid to allow only the movements of said claw (3).
4. Système de commande selon la revendication 3, caractérisé en ce que ladite -électrovanne (6) est commandée électriquement au moyen de deux boutons-poussoirs distincts, le premier (71) dit de "synchronisation" permettant le passage de ladite électrovanne (6) de la position neutre (61) à la position de synchronisation (63) et le second (70) dit "d'activation de griffe" permettant le passage de la position neutre (61) à la position (62) de manipulation de griffe. 4. Control system according to claim 3, characterized in that said solenoid valve (6) is electrically controlled by means of two separate push-buttons, the first (71) of "synchronization" allowing the passage of said solenoid valve (6 ) from the neutral position (61) to the synchronization position (63) and the second (70) called "claw activation" allowing passage from the neutral position (61) to the claw handling position (62) .
5. Système de commande selon la revendication 4, caractérisé en ce que lesdits boutons-poussoirs (70, 71) sont montés sur une poignée de commande (7) permettant d'actionner le distributeur de commande (5) de la circulation du liquide hydraulique. 5. Control system according to claim 4, characterized in that said push buttons (70, 71) are mounted on a control handle (7) for actuating the control distributor (5) of the circulation of hydraulic fluid .
EP05757165A 2004-04-13 2005-04-12 System for controlling and synchronising movements of two parts of a tool carried by a loader Active EP1738033B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0403836A FR2868794B1 (en) 2004-04-13 2004-04-13 SYSTEM FOR CONTROLLING THE MOTION SYNCHRONIZATION OF BOTH PARTS OF A TOOL CARRIED BY A CHARGER
PCT/FR2005/000877 WO2005103394A1 (en) 2004-04-13 2005-04-12 System for controlling and synchronising movements of two parts of a tool carried by a loader

Publications (2)

Publication Number Publication Date
EP1738033A1 true EP1738033A1 (en) 2007-01-03
EP1738033B1 EP1738033B1 (en) 2009-10-14

Family

ID=34945413

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05757165A Active EP1738033B1 (en) 2004-04-13 2005-04-12 System for controlling and synchronising movements of two parts of a tool carried by a loader

Country Status (6)

Country Link
EP (1) EP1738033B1 (en)
AT (1) ATE445739T1 (en)
DE (1) DE602005017133D1 (en)
FR (1) FR2868794B1 (en)
NZ (1) NZ551238A (en)
WO (1) WO2005103394A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS622805U (en) * 1985-06-20 1987-01-09
US5094581A (en) * 1990-11-13 1992-03-10 Lamb George K Bale handling apparatus
US5123185A (en) * 1991-07-03 1992-06-23 Pollard Albert C Front loader jaw accessory
US6135290A (en) * 1998-06-05 2000-10-24 Rockland Manufacturing Company Sifter attachment for excavating machines and the like
US6074160A (en) * 1999-05-13 2000-06-13 Brumbaugh; Eugene L. Grapple for loader bucket
US6453586B1 (en) * 2000-03-23 2002-09-24 Robert H. Wolin Bucket assembly
FR2828877B1 (en) * 2001-08-22 2004-01-09 Serrurerie Didier Gobin ARTICULATED FORK WITH VERY LARGE OPENING
US7241101B2 (en) * 2002-05-28 2007-07-10 Westendorf Manufacturing Company, Inc. Double action grab fork and method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005103394A1 *

Also Published As

Publication number Publication date
WO2005103394A1 (en) 2005-11-03
EP1738033B1 (en) 2009-10-14
NZ551238A (en) 2010-04-30
DE602005017133D1 (en) 2009-11-26
ATE445739T1 (en) 2009-10-15
FR2868794A1 (en) 2005-10-14
FR2868794B1 (en) 2006-07-07

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