EP1738033B1 - 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 Download PDF

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Publication number
EP1738033B1
EP1738033B1 EP05757165A EP05757165A EP1738033B1 EP 1738033 B1 EP1738033 B1 EP 1738033B1 EP 05757165 A EP05757165 A EP 05757165A EP 05757165 A EP05757165 A EP 05757165A EP 1738033 B1 EP1738033 B1 EP 1738033B1
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EP
European Patent Office
Prior art keywords
claw
called
solenoid valve
handling member
bucket
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EP05757165A
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German (de)
French (fr)
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EP1738033A1 (en
Inventor
Loïc MAILLEUX
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Mailleux SA
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Mailleux SA
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    • 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 equipping a tractor has at its free end a tool holder frame on which can be locked various tools.
  • some combine a claw with a material handling member, such as a bucket.
  • the object of the invention is to solve these problems.
  • the invention relates to a control system for the synchronization of the movements of a claw and a handling member such as a bucket, this claw and this handling member constituting a tool carried by a loader.
  • 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 opening movement of the claw and the tipping of the handling member concomitantly and that on the other hand closing movements of the claw and lifting of the handling member are also concomitantly.
  • the reference number T designates 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 comprises a pair of lifting cylinders VL (only one of which is visible in the front views corresponding to the figures), which make it possible to turn the stretcher B about its hinge axis X, so as to cause the lifting or the lowering of the tool O carried by the CP frame .
  • 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 may also be a de-rigging 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 loader C also comprises a pair of tipping cylinders 1 (only one of which is visible in the figures which are front views), with a double effect making it possible to pivot the tool O with respect to the stretcher B and around a X axis 1 .
  • the cylinders 1 constitute means for controlling the orientation of the bucket 2.
  • This jack 1 comprises a piston 10 secured to the CP tool holder frame and a cylinder 11 secured to the B stretcher .
  • This cylinder 1 also has a small chamber 110 (on the piston rod side 10) and a large opposite chamber 111.
  • the tractor T is equipped with hydraulic sources of low and high pressure, respectively BP (atmospheric pressure) and HP (pressure of the order of 1.5 ⁇ 10 7 at 2.10 7 Pa).
  • the conduit 8 corresponds to the supply of high pressure liquid and the conduit 9 to return to the tank (low pressure line).
  • the ducts 8 and 9 are connected, via a three-position control distributor 5 and a solenoid valve 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.
  • connection 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 solenoid valve EV is placed in the so-called “neutral” position represented on 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 cylinder 1, while the small chamber 110 is connected to the low liquid reservoir pressure.
  • the piston 10 is moved to the position shown on the figure 3 and the bucket 2 is inclined.
  • control distributor 5 in the opposite position (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 raising of the bucket 2 towards its position. original.
  • the small chamber 110 will be conventionally referred to as "lifting chamber” because the supply of pressurized liquid into this chamber causes the bucket 2 to be raised.
  • the claw 3 is equipped with a pair of jacks 4, hereinafter referred to as "jaw cylinders" (only one of which is visible in the figures in front view). These jacks are means for controlling the opening and closing of the claw 3.
  • This double-acting cylinder 4 comprises a piston 40 integral with the claw 3 and a cylinder 41 integral with the upper part of the skip 2.
  • the jack 4 further has a small chamber 410 on the piston side and a large chamber 411 on the opposite side.
  • the ducts 8 and 9 are connected to the claw jack 4, via the control distributor 5 and the solenoid valve EV.
  • the connections between the solenoid valve EV and the chambers 410 and 411 are referenced respectively 86 and 85.
  • control valve 5 being in the opposite position 52 - the solenoid valve EV is always in the same position - it is possible to bring the liquid into the large chamber 411 of the cylinder 4 and thus close the claw 3.
  • the small chamber 410 will be conventionally referred to as "claw opening chamber", since the supply of pressurized liquid into this chamber causes the claw 3 to open.
  • the solenoid valve EV is controlled by an electric switch 700, itself actuated by a push button 70, called "claw activation".
  • the large-scale detail in a circle at the top left of the figures represents 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.
  • buttons 72, 73 make it possible to actuate the various actuators of the loader and in particular the lifting jack VL of the loader C.
  • the operator who wishes to dump the contents of the bucket 2 in a trailer for example, (the loader C being in the up position), must press and hold down the push button 70 and then push the control handle 7 of the control valve 5 so that the claw 3 opens.
  • the operator must therefore decompose the two opening operations of the claw 3 and discharge of the bucket 2.
  • the figure 3 illustrates the control system according to the invention that solves this problem.
  • the tipping cylinder 4 and the jack cylinder 1 are mounted in series on the hydraulic supply circuit, via a three-position solenoid valve 6 which replaces the solenoid valve EV of the state of the art.
  • the solenoid valve 6 can be placed in the two positions called “neutral” (referenced 61) and “claw manipulation” (referenced 62) as previously defined for the solenoid valve EV. These positions are illustrated respectively on the figures 4 and 5 .
  • the solenoid valve 6 can also be brought into a third position called "synchronization" referenced 63 and illustrated on the figure 3 , in which the claw cylinder 4 and the tipping cylinder 1 are connected in series to the hydraulic supply circuit.
  • the claw opening chamber 410 of the claw jack 4 is in hydraulic fluid communication with the lifting chamber 110 of the jack 1, via the solenoid valve 6.
  • the opening of the claw 3 is synchronized with the tipping or dumping of the bucket 2.
  • the displacement of the control valve 5 in the reverse position 52 causes the reverse circulation of the hydraulic fluid and the synchronization of the closure of the claw 3 with the lifting of the bucket 2.
  • the solenoid valve 6 is controlled by an electrical switch 700 called "claw actuation", in accordance with what has been previously described for the solenoid valve EV and which makes it possible to bring the solenoid valve 6 from the neutral position 61 to the claw handling position 62.
  • the solenoid valve 6 is further controlled by a second electrical switch 710 called “synchronization", itself actuated by a pushbutton 71 carried by the control handle 7.
  • the synchronization switch 710 makes it possible to bring the solenoid valve 6 from the neutral position 61 to the synchronization position 63.
  • the operator who wishes to dump the contents of the bucket 2 in a trailer for example, only has to perform a single operation, that is to say, hold down 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 is poured.

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  • 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)
  • Operation Control Of Excavators (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Automatic Assembly (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

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.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.

Un chargeur frontal équipant un tracteur présente à son extrémité libre un cadre porte-outil sur lequel peuvent être verrouillés divers outils.A front loader equipping a tractor has at its free end a tool holder frame on which can be locked various tools.

Parmi ces outils, certains combinent une griffe avec un organe de manutention de matières, tel qu'une benne.Among these tools, some combine a claw with a material handling member, such as a bucket.

Par exemple, le document US 4 736 673 A (Harada et al. ) divulgue un système de commande selon le préambule de la revendication 1.For example, the document US 4,736,673A (Harada et al. ) discloses a control system according to the preamble of claim 1.

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.In control systems known from the state of the art, the opening or closing of the claw and the modification of the orientation of the bucket, that is to say its discharge or lifting can not be carried out only successively and independently.

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.The fact that the movements of different parts of a tool can not be performed simultaneously causes the operator to lose time on work cycles that can be quite short.

L'invention a pour objectif de résoudre ces problèmes.The object of the invention is to solve these problems.

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.To this end, the invention relates to a control system for the synchronization of the movements of a claw and a handling member such as a bucket, this claw and this handling member constituting a tool carried by a loader. orientation of the handling member being activated by first control means, the opening and closing of the claw being controlled by second control means.

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.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 opening movement of the claw and the tipping of the handling member concomitantly and that on the other hand closing movements of the claw and lifting of the handling member are also concomitantly.

Grâce à cet arrangement, les mouvements des deux parties de l'outil peuvent être synchronisés, c'est-à-dire effectués en même temps.With this arrangement, the movements of the two parts of the tool can be synchronized, that is to say done at the same time.

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.
According to other advantageous and nonlimiting features of the invention, taken alone or in combination:
  • the first control means are a hydraulic cylinder with double effect, called "tipping", the second control means are a cylinder hydraulic double-acting, called "claw", and the two cylinders are mounted in series on a hydraulic supply circuit, via a solenoid valve, so that when the solenoid valve is in the position called "synchronization", the so-called chamber "claw opening" of the claw jack is in hydraulic fluid communication 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 fluid to allow only the movements of the handling member and a position known as "claw manipulation" in which only the claw cylinder is supplied with hydraulic fluid to allow only the movements of said claw;
  • said solenoid valve is electrically controlled by means of two separate pushbuttons, the first said "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 manipulation position.

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.Other features and advantages of the invention will appear from the description which will now be made, with reference to the accompanying drawings, which show, by way of non-limiting example, a preferred embodiment.

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).
On these drawings:
  • the 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,
  • the figure 2 is a pattern similar to that of the figure 1 , the control system being in a position allowing only the movement of the claw,
  • the figures 3 , 4 and 5 are diagrams similar to that of the figure 1 but representing 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 body are allowed ( figure 4 ) and a position in which only the movements of the claw are allowed ( 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. In the figures, the reference number T designates 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.

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. The loader comprises a pair of lifting cylinders VL (only one of which is visible in the front views corresponding to the figures), which make it possible to turn the stretcher B about its hinge axis X, so as to cause the lifting or the lowering of the tool O carried by the CP frame .

L'outil O comprend un organe de manutention 2 associé à une griffe 3.The tool O comprises a handling member 2 associated with a claw 3.

Sur les figures, cet organe de manutention 2 est une benne, c'est-à-dire un outil creux ou godet.In the figures, this handling member 2 is a bucket, that is to say a hollow tool or bucket.

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.According to other embodiments not shown in the figures, the tool O may also be a de-rigging 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.

Dans la suite de la description et à des fins de simplification, on a considéré que l'organe 2 était une benne.In the remainder of the description and for purposes of simplification, it was considered that the member 2 was a skip.

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 X1. The loader C also comprises a pair of tipping cylinders 1 (only one of which is visible in the figures which are front views), with a double effect making it possible to pivot the tool O with respect to the stretcher B and around a X axis 1 .

Les vérins 1 constituent des moyens de commande de l'orientation de la benne 2.The cylinders 1 constitute means for controlling the orientation of the bucket 2.

Ce vérin 1 comprend un piston 10 solidaire du cadre porte-outil CP et un cylindre 11 solidaire du brancard B. This jack 1 comprises a piston 10 secured to the CP tool holder frame and a cylinder 11 secured to the B stretcher .

Ce vérin 1 présente en outre une petite chambre 110 (du côté de la tige de piston 10) et une grande chambre opposée 111.This cylinder 1 also has a small chamber 110 (on the piston rod side 10) and a large opposite chamber 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).In the usual way, the tractor T is equipped with hydraulic sources of low and high pressure, respectively BP (atmospheric pressure) and HP (pressure of the order of 1.5 × 10 7 at 2.10 7 Pa).

Le conduit 8 correspond à l'amenée de liquide haute pression et le conduit 9 au retour au réservoir (ligne basse pression).The conduit 8 corresponds to the supply of high pressure liquid and the conduit 9 to return to the tank (low pressure line).

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.The ducts 8 and 9 are connected, via a three-position control distributor 5 and a solenoid valve 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.

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.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.

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.When the control valve 5 is in the state illustrated on the figure 1 (Position called "neutral" referenced 50), the chambers 110 and 111 are isolated from hydraulic sources, the liquid can not escape or enter.

Pour provoquer le bennage de la benne 2, c'est-à-dire son basculement vers le bas autour de l'axe X1 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.To provoke the tipping of the bucket 2, that is to say its tilting down around the axis X 1 in order to dump its contents, the solenoid valve EV is placed in the so-called "neutral" position represented on 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 cylinder 1, while the small chamber 110 is connected to the low liquid reservoir pressure. The piston 10 is moved to the position shown on the figure 3 and the bucket 2 is inclined.

Le déplacement du distributeur de commande 5 en position inverse (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 2 vers sa position d'origine.The displacement of the control distributor 5 in the opposite position (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 raising of the bucket 2 towards its position. original.

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.In the rest of the description and the claims, the small chamber 110 will be conventionally referred to as "lifting chamber" because the supply of pressurized liquid into this chamber causes the bucket 2 to be raised.

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.The claw 3 is equipped with a pair of jacks 4, hereinafter referred to as "jaw cylinders" (only one of which is visible in the figures in front view). These jacks are means for controlling the opening and closing of the claw 3.

Ce vérin 4 à double effet comprend un piston 40 solidaire de la griffe 3 et un cylindre 41 solidaire de la partie supérieure de la benne 2.This double-acting cylinder 4 comprises a piston 40 integral with the claw 3 and a cylinder 41 integral with the upper part of the skip 2.

Le vérin 4 présente en outre une petite chambre 410 du côté piston et une grande chambre 411, du côté opposé.The jack 4 further has a small chamber 410 on the piston side and a large chamber 411 on the opposite side.

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.The ducts 8 and 9 are connected to the claw jack 4, via the control distributor 5 and the solenoid valve EV. The connections between the solenoid valve EV and the chambers 410 and 411 are referenced respectively 86 and 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.When the solenoid valve EV is in the position called "claw manipulation" represented on the figure 2 and the control distributor 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 allow the opening of the claw 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.Conversely, the control valve 5 being in the opposite position 52 - the solenoid valve EV is always in the same position - it is possible to bring the liquid into the large chamber 411 of the cylinder 4 and thus close the claw 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.In the rest of the description and the claims, the small chamber 410 will be conventionally referred to as "claw opening chamber", since the supply of pressurized liquid into this chamber causes the claw 3 to open.

L'électrovanne EV est pilotée par un interrupteur électrique 700, lui-même actionné par un bouton-poussoir 70, dit "d'activation de griffe".The solenoid valve EV is controlled by an electric switch 700, itself actuated by a push button 70, called "claw activation".

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.The large-scale detail in a circle at the top left of the figures represents part of the control handle 7 which is provided with the tractor. This handle 7 makes it possible to actuate the control distributor 5.

Le bouton-poussoir 70 est monté sur la poignée 7.The push-button 70 is mounted on the handle 7.

D'autres boutons-poussoirs 72, 73 permettent d'actionner les différents organes de manoeuvre du chargeur et notamment le vérin de levage VL du chargeur C. Other pushbuttons 72, 73 make it possible to actuate the various actuators of the loader and in particular the lifting jack VL of the loader 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.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 up position), must press and hold down the push button 70 and then push the control handle 7 of the control valve 5 so that the claw 3 opens.

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.It must then release the pushbutton 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.

L'opérateur doit donc décomposer les deux opérations d'ouverture de la griffe 3 et de déversement de la benne 2.The operator must therefore decompose the two opening operations of the claw 3 and discharge of the bucket 2.

La figure 3 illustre le système de commande conforme à l'invention qui permet de résoudre ce problème.The figure 3 illustrates the control system according to the invention that solves this problem.

Tous les éléments communs avec le dispositif de l'état de la technique portent les mêmes références numériques.All the elements common with the device of the state of the art bear the same numerical references.

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.According to the invention, the tipping cylinder 4 and the jack cylinder 1 are mounted in series on the hydraulic supply circuit, via a three-position solenoid valve 6 which replaces the solenoid valve EV of the state of the art.

L'électrovanne 6 peut être placée dans les deux positions dites "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.The solenoid valve 6 can be placed in the two positions called "neutral" (referenced 61) and "claw manipulation" (referenced 62) as previously defined for the solenoid valve EV. These positions are illustrated respectively on the figures 4 and 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.The solenoid valve 6 can also be brought into a third position called "synchronization" referenced 63 and illustrated on the figure 3 , in which the claw cylinder 4 and the tipping cylinder 1 are connected in series to the hydraulic supply circuit.

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.More specifically, the claw opening chamber 410 of the claw jack 4 is in hydraulic fluid communication with the lifting chamber 110 of the jack 1, via the solenoid valve 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.When the solenoid valve 6 is in this synchronization position 63 and the control valve 5 is in the active position 51, the hydraulic fluid is brought under pressure into the large chamber 111 of the cylinder 1. The liquid present in the lifting chamber 110 is driven towards the solenoid valve 6 and is returned via the pipe 86 to the opening chamber of the claw 410 of the cylinder 4, before returning to the low pressure tank.

Ainsi, l'ouverture de la griffe 3 est synchronisée avec le bennage ou déversement de la benne 2.Thus, the opening of the claw 3 is synchronized with the tipping or dumping of the bucket 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.The displacement of the control valve 5 in the reverse position 52 causes the reverse circulation of the hydraulic fluid and the synchronization of the closure of the claw 3 with the lifting of the bucket 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.The solenoid valve 6 is controlled by an electrical switch 700 called "claw actuation", in accordance with what has been previously described for the solenoid valve EV and which makes it possible to bring the solenoid valve 6 from the neutral position 61 to the claw handling position 62.

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.The solenoid valve 6 is further controlled by a second electrical switch 710 called "synchronization", itself actuated by a pushbutton 71 carried by the control handle 7.

L'interrupteur de synchronisation 710 permet d'amener l'électrovanne 6 de la position neutre 61 à la position de synchronisation 63.The synchronization switch 710 makes it possible to bring the solenoid valve 6 from the neutral position 61 to the synchronization position 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.With the control system according to the invention, the operator who wishes to dump the contents of the bucket 2 in a trailer for example, (the loader C being in the up position) only has to perform a single operation, that is to say, hold down 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 is poured.

Claims (5)

  1. A system for controlling synchronization of the movements of a claw (3) and a handling member (2) such as a bucket, the claw (3) and the 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), opening and closing of the claw (3) being controlled by second control means (4), the system being characterized in that it comprises synchronization means (6) for synchronizing the operation of said first and second control means (1, 4), in such a manner that firstly the opening movement of the claw (3) and the dumping movement of the handling member (2) take place together, and secondly the closing movement of the claw (3) and the raising movement of the handling member (2) also take place together.
  2. A control system according to claim 1, characterized in that the first control means (1) are a so-called "bucket" double-acting hydraulic actuator, and the second control means (4) are a so-called "claw" double-acting hydraulic actuator, and in that both actuators (1 and 4) are connected in series on a hydraulic feed circuit via a solenoid valve (6) in such a manner that when the solenoid valve (6) is in a so-called "synchronization" position (63), the so-called "claw-opening" chamber (410) of the claw actuator (4) is in hydraulic liquid communication with the so-called "raising" chamber (110) of the bucket actuator (1).
  3. A control system according to claim 2, characterized in that the solenoid valve (6) can occupy two other positions, a so-called "neutral" position (61) in which only the bucket actuator (1) is fed with hydraulic liquid in order to allow movements of the handling member (2) only, and a so-called "claw-moving" position (62) in which only the claw actuator (4) is fed with hydraulic liquid to authorize only movements of said claw (3).
  4. A control system according to claim 3, characterized in that said solenoid valve (6) is electrically controlled by means of two distinct pushbuttons, a so-called "synchronization", first pushbutton (71) enabling said solenoid valve (6) to go from the neutral position (61) to the synchronization position (63), and the so-called "claw-activation", second pushbutton (70) enabling it to pass from the neutral position (61) to the claw-moving position (62).
  5. A control system according to claim 4, characterized in that said pushbuttons (70, 71) are mounted on a control knob (7) enabling the control valve (5) for controlling hydraulic liquid flow to be actuated.
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 EP1738033A1 (en) 2007-01-03
EP1738033B1 true 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

Also Published As

Publication number Publication date
WO2005103394A1 (en) 2005-11-03
DE602005017133D1 (en) 2009-11-26
FR2868794B1 (en) 2006-07-07
ATE445739T1 (en) 2009-10-15
NZ551238A (en) 2010-04-30
EP1738033A1 (en) 2007-01-03
FR2868794A1 (en) 2005-10-14

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