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EP1261463A1 - Load handling device with servo feed-back control - Google Patents

Load handling device with servo feed-back control

Info

Publication number
EP1261463A1
EP1261463A1 EP01911844A EP01911844A EP1261463A1 EP 1261463 A1 EP1261463 A1 EP 1261463A1 EP 01911844 A EP01911844 A EP 01911844A EP 01911844 A EP01911844 A EP 01911844A EP 1261463 A1 EP1261463 A1 EP 1261463A1
Authority
EP
European Patent Office
Prior art keywords
load
arm
axis
operator
balancer
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.)
Withdrawn
Application number
EP01911844A
Other languages
German (de)
French (fr)
Inventor
Christian Salesse
Jean-Marc Loriot
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.)
Individual
Original Assignee
Individual
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.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1261463A1 publication Critical patent/EP1261463A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J19/00—Accessories fitted to manipulators, e.g. for monitoring, for viewing; Safety devices combined with or specially adapted for use in connection with manipulators
    • B25J19/0008—Balancing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/005—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with balanced jib, e.g. pantograph arrangement, the jib being moved manually
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S414/00—Material or article handling
    • Y10S414/13—Handlers utilizing parallel links

Definitions

  • the invention relates to a load handling device.
  • Load handling devices are already known which generally comprise an arm mounted to pivot about an axis, most often horizontal, to ensure the movement of the load in an essentially vertical direction.
  • Such devices find in particular an application for controlling a robot arm used for handling or handling a load which can be, for example, a tool.
  • the handling device must be provided with an aid or assistance function to allow this handling without effort on the part of the operator.
  • pneumatic solutions comprising a jack ensuring the suspension of the load and / or its vertical displacement.
  • Such solutions if they give relatively satisfactory results for small loads, become impossible to manage as soon as the air volume of the jack exceeds approximately 1 dm 3 . This is due to the pressure drops which cause pressure variations between the different points of the circuit, as well as to the compressibility of the air.
  • Such pneumatic means have the disadvantage of having a response time of the order of a second, that is to say a time that is too long not to be felt by an operator.
  • the object of the invention is in particular to overcome the aforementioned drawbacks.
  • It aims in particular to provide a load handling device which is equipped with means, simple to perform, making it possible to assist in handling.
  • the invention proposes a device for handling a load, which comprises, in combination:
  • a mechanical balancer with low response time comprising balancing means housed in this body and acting on an axis of rotation, as well as an arm of which a proximal end is wedged on the axis of rotation and of which a distal end is capable of supporting the load, and
  • an assistance mechanism which includes a force sensor placed in a chosen location to detect a variation in the apparent weight of the load, as a result of a force exerted on this load following a movement of an operator, control means actuated by the force sensor, and an actuator controlled by the control means and connected to the arm to assist the movement of the operator.
  • the invention resides in the combination, on the one hand, of a mechanical balancer with low response time, essentially comprising an arm connected to balancing means and, on the other hand, of a mechanism for servo which is coupled to this arm to assist the handling of a load carried by the arm.
  • balancer also called balancing device, of the type described in French Patents n ° 84 08383 and 88 02423.
  • Such devices which are purely mechanical, are used in particular to balance the forces acting on an arm stressed by a load, such as a tool. They then make it possible to obtain a rigorous balancing of the arm, whatever its angular position relative to the body on which it is articulated. Normally, the arm can rotate 360. relative to the body, allowing the load to follow a circular path.
  • a balancing device of this type the operator can move the load, for example a tool, practically without effort since the balancing device compensates for the forces acting on the arm, regardless of the angular position of the latter around its axis of articulation in rotation, which is generally horizontal.
  • the axis of rotation of the balancer arm is preferably substantially horizontal.
  • the force sensor is designed to detect a variation in the apparent weight of the load. It must be able to detect a difference in force, even a small one, generated by the operator on the load, this difference possibly being of the order of a few hundred grams to a few kilograms.
  • the force sensor is advantageously integrated into a deformable mechanical structure capable of bringing back to said sensor the vertical component of the forces resulting from the weight of the load.
  • this deformable mechanical structure is interposed between the distal end of the arm and the load, and it comprises a parallelogram.
  • the assistance mechanism is provided to ensure motorization along the vertical, in one direction or the other, from the detection provided by the force sensor. This makes it possible, compared to previous devices, to ensure a significant reduction in hysteresis as well as inertial effects which the efforts of the operator must compensate.
  • a mechanical balancer such as that described in the aforementioned French Patents, makes it possible to provide such high precision balancing.
  • the actuator of the assistance mechanism is advantageously connected to a support and to a link secured to the arm.
  • the actuator is a pneumatic cylinder, in particular with a volume of less than 1 dm 3 .
  • This low volume makes it possible to give this pneumatic cylinder operating parameters, in particular at the level of the response time, which make it compatible with the characteristics necessary for good handling comfort for the operator.
  • This pneumatic cylinder is advantageously controlled by the servo means through a proportional valve.
  • control means make it possible to control the actuator, for example a pneumatic cylinder, which assists the movement desired by the operator. This assistance is therefore done by simple pressure exerted by the operator directly on the load and not by action on a control button.
  • FIG. 1 is a diagram of a handling device, according to a first embodiment of the invention.
  • FIG. 2 is a diagram of a handling device, according to a second embodiment of the invention.
  • FIG. 1 represents a handling device according to the invention.
  • This device comprises a mechanical balancer 10, with a low response time, comprising a body 12 fixed to a support 14 (itself fixed or mobile).
  • the body internally houses balancing means 16 which may be, for example, identical or analogous to those described in French Patent 84 08383 or French Patent 88 02 423, already cited, to which reference may be made for further information.
  • the balancing means 16 act on an axis of rotation 18 carried by the body 12 and extending, in the example, in a substantially horizontal direction.
  • the balancer 10 comprises an arm 20 having a proximal end 22 wedged on the shaft 18 and a distal end 24, also called free end.
  • the arm 20 can oscillate around the articulation axis 18, so that its free end 24 follows a circular trajectory, the movement of the arm can be between 0 and 360 °.
  • the end 24 of the arm 20 constitutes an articulated connection for a connection member 26 at the end of which a load can be hung 28. Due to the articulation connection, the center of gravity of all the suspended mass ( link 26 and load 28) is positioned effortlessly and, naturally, vertically from the end 24 of the arm.
  • the horizontal axis 18 constitutes the output shaft of the mechanical balancer 10 and produces a sinusoidal torque.
  • the balancing means 16 are adjusted to provide balancing as a function of a defined load and thus allow an operator to handle or handle this load without particular effort and with a short time of reply.
  • the load is a gripping device which has its own weight and to which one or more loads can be hung, during a cycle of operation, whose own weight is added to that of the gripping device itself.
  • the invention precisely makes it possible to take account of the variations in the load and the frictions induced by the balancer.
  • a servo mechanism which firstly comprises a force sensor 30, for example of the electrical type, placed at a location chosen to detect a variation in the apparent weight of the load 28.
  • This sensor effort must be judiciously integrated into the connecting member 26, that is to say between the free end 24 of the arm and the load 28 itself.
  • This effort sensor continuously measures the weight of the load 28 and transmits this information to servo means 32 which are thus actuated by this effort sensor.
  • These control means 32 control an actuator 34, which is connected to the arm 20 to assist the movement of the operator.
  • the actuator 34 is a pneumatic cylinder, one end of which is fixed to the support 14 and the other end of which is connected to a link 36 secured to the arm 20. The pneumatic cylinder thus acts synchronously with respect to the balancer.
  • the sensor 30 makes it possible to detect the apparent weight differences of the load compared to a reference value (these small differences are due to the action of an operator who seeks to move the load 28 downwards or upwards) and regulates the pressure in the cylinder 34 so as to assist the operator in the movement he wishes.
  • the handling device of FIG. 1 represents a simple assembly. However, it is possible to provide more sophisticated arrangements, as shown in FIG. 2.
  • a balancer 10 having an arm 20, articulated around an axis 18 and an assistance mechanism identical or similar to that described above and comprising a force sensor 30, servo means 32 and an actuator 34 interposed between the support 14 and a link 36, integral with the arm 20.
  • the arm 20 and the force sensor 30 are part of a more sophisticated assembly.
  • the load 28 is supported vertically by a connecting member 38 carried at the end 40 of a horizontal arm 42, another end 44 of which is mounted at the lower end of a vertical axis 46 capable of pivoting on itself, so that the arm 42 can describe a rotational movement relative to the axis 46.
  • This axis 46 is fixed to a parallelogram mechanism 68 which comprises two substantially connecting rods 48 and 50, substantially horizontal, articulated respectively by points 52 and 54 on the axis 46 and by points 56 and 58 on a vertical axis 60.
  • This axis 60 is articulated on the end 24 of the arm 20 of the balancer and is articulated at 62 at the end of an arm 64 mounted in parallel with the arm 20 and articulated by a point 66 on the support.
  • the axis 60 forms, in combination with the arm and the arm 64, a deformable parallelogram structure, in which the axis 60 remains vertical.
  • the vertical axes 46 and 60, as well as the connecting rods 48 and 50 constitute a deformable mechanical structure of said parallelogram 68.
  • the connecting rod 48 is held in horizontal position by means of the force sensor 30, which is fixed at the end 70 of a bar 72, rigidly fixed at 74 on the vertical axis 60.
  • the force sensor 30 deforms very slightly as a function of the force to which it is subjected and which it measures.
  • the horizontality of the connecting rod 48 is not strictly perfect, but sufficient not to distort the operation of the mechanism, taking into account the order of magnitude of the values of the measurement necessary for its proper operation. It is essential that the deformable parallelogram 68 ensures the verticality of the axis 46, while reducing to the sensor the only vertical component of the forces generated by the weight of the load, whatever the position of the latter relative to the vertical axis 46, both in rotation about this axis 46 and in radial translation relative to this same axis 46.
  • the axis 60 ensures free rotation of the assembly on points 56, 58, 24 and 62.
  • the axis 60 as well as the arms 20 and 64 constitute a deformable parallelogram 76 which keeps this axis 60 vertical.
  • the balancer 10 provides compensation for the major part of the weight of the load as well as for the mechanical structure composing the two parallelograms 68 and 76.
  • the sensor 30 continuously measures the weight of the load and transmits the value to the servo means 32 which, themselves, drive the actuator 34, in the same manner as in the previous embodiment.
  • balancer itself is susceptible to numerous variants, and that it is not limited to a mechanical balancer of the type of those described in the French Patents mentioned above.
  • the axis of rotation, or output shaft, of the balancer is used as the base, either of an oscillating arm, or of a parallelogram.
  • the balancer is not integrated into the structure of the device and where a transmission ensures synchronization of the movements and therefore of the forces.
  • the assistance mechanism is susceptible of numerous variants and it is possible to provide other control means than those described above.
  • the actuator is preferably a pneumatic cylinder, it is envisaged to use other types of actuators capable of providing motorization of the arm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Manipulator (AREA)

Abstract

The invention concerns a handling device comprising, in combination, a mechanical equilibrium mechanism (10) with low reaction time, having an arm (20) whereof the proximal end (22) is locked on a pivot pin (18) and whereof the distal end (26) is adapted to support a load (10), a force sensor (30) positioned in a selected site for detecting apparent weight variation of the load (10) resulting from a force being exerted on said load in response to an operator's movement, servo feed-back means (32) actuated by the force sensor (30), and an actuator (34) controlled by the servo feed-back means (32) and connected to the arm (20) to assist the operator's movement. The invention is applicable in particular to robot arms or the like.

Description

Dispositif de manutention de charge à commande asservieLoad handling device with controlled control
L'invention concerne un dispositif de manutention de charge.The invention relates to a load handling device.
On connaît déjà des dispositifs de manutention de charge qui comprennent généralement un bras monté pivotant autour d'un axe, le plus souvent horizontal, pour assurer le déplacement de la charge suivant une direction essentiellement verticale.Load handling devices are already known which generally comprise an arm mounted to pivot about an axis, most often horizontal, to ensure the movement of the load in an essentially vertical direction.
De tels dispositifs trouvent notamment une application pour la commande d'un bras de robot utilisé pour la manutention ou la manipulation d'une charge qui peut être, par exemple, un outil.Such devices find in particular an application for controlling a robot arm used for handling or handling a load which can be, for example, a tool.
De tels dispositifs doivent permettre de fournir une aide ou assistance à l'opérateur, de manière que celui-ci puisse déplacer la charge sans effort particulier.Such devices must make it possible to provide aid or assistance to the operator, so that the latter can move the load without any particular effort.
Autrement dit, il faut que le dispositif de manutention soit pourvu d'une fonction d'aide ou d'assistance pour permettre cette manutention sans effort de la part de l'opérateur.In other words, the handling device must be provided with an aid or assistance function to allow this handling without effort on the part of the operator.
Jusqu'à présent, une telle fonction d'aide ou d'assistance a été procurée par trois types de solutions.So far, such a help or assistance function has been provided by three types of solutions.
On connaît tout d'abord des solutions pneumatiques comprenant un vérin assurant la suspension de la charge et/ou son déplacement vertical. De telles solutions, si elles donnent des résultats relativement satisfaisants pour des petites charges, deviennent impossibles à gérer dès que le volume d'air du vérin dépasse environ 1dm3. Ceci est dû aux pertes de charge qui engendrent des variations de pression entre les différents points du circuit, ainsi qu'à la compressibilité de l'air. De tels moyens pneumatiques ont pour inconvénient d'avoir un temps de réponse de l'ordre de la seconde, c'est-à-dire un temps trop important pour ne pas être ressenti par un opérateur.Firstly, pneumatic solutions are known comprising a jack ensuring the suspension of the load and / or its vertical displacement. Such solutions, if they give relatively satisfactory results for small loads, become impossible to manage as soon as the air volume of the jack exceeds approximately 1 dm 3 . This is due to the pressure drops which cause pressure variations between the different points of the circuit, as well as to the compressibility of the air. Such pneumatic means have the disadvantage of having a response time of the order of a second, that is to say a time that is too long not to be felt by an operator.
On connaît aussi des solutions mixtes dans lesquelles un système pneumatique est accouplé à un contrepoids. Ces solutions, qui conduisent aux mêmes résultats que les solutions précédentes, présentent en plus l'inconvénient d'une augmentation importante de l'inertie, ce qui peut même en plus pénaliser les mouvements horizontaux de la charge.Mixed solutions are also known in which a pneumatic system is coupled to a counterweight. These solutions, which lead to the same results as the previous solutions, have the additional disadvantage of a significant increase in inertia, which can even further penalize the horizontal movements of the load.
On connaît aussi des solutions électriques qui impliquent généralement l'utilisation de sortes de palans à réglage de charge automatique. Ces solutions ont les inconvénients, d'une part, des systèmes sophistiqués (risque de panne) et, d'autre part, de nécessiter une phase de pesage pendant laquelle la charge n'est pas contrôlée et peut être dangereuse pour 1 ' opérateur .Electrical solutions are also known which generally involve the use of kinds of hoists with automatic load adjustment. These solutions have the drawbacks, on the one hand, of sophisticated systems (risk of breakdown) and, on the other hand, of requiring a weighing phase during which the load is not controlled and can be dangerous for the operator.
Ainsi, dans ces trois types de solutions, la fonction d'aide à la manutention est très mal assurée.Thus, in these three types of solutions, the handling aid function is very poorly ensured.
L'invention a notamment pour but de surmonter les inconvénients précités.The object of the invention is in particular to overcome the aforementioned drawbacks.
Elle vise en particulier à procurer un dispositif de manutention de charge qui est équipé de moyens, simples à réaliser, permettant d'aider à la manutention.It aims in particular to provide a load handling device which is equipped with means, simple to perform, making it possible to assist in handling.
Elle vise aussi à procurer un tel dispositif de manutention qui présente en outre l'avantage d'avoir un faible temps de réponse, de manière à ne pas être ressenti par l'opérateur.It also aims to provide such a handling device which also has the advantage of having a low response time, so as not to be felt by the operator.
L'invention propose à cet effet un dispositif de manutention d'une charge, lequel comprend, en combinaison :To this end, the invention proposes a device for handling a load, which comprises, in combination:
- un équilibreur mécanique à faible temps de réponse, comprenant des moyens d'équilibrage logés dans ce corps et agissant sur un axe de rotation, ainsi qu'un bras dont une extrémité proximale est calée sur l'axe de rotation et dont une extrémité distale est propre à supporter la charge, eta mechanical balancer with low response time, comprising balancing means housed in this body and acting on an axis of rotation, as well as an arm of which a proximal end is wedged on the axis of rotation and of which a distal end is capable of supporting the load, and
- un mécanisme d'assistance qui comprend un capteur d'effort placé en un endroit choisi pour détecter une variation de poids apparent de la charge, en conséquence d'une force exercée sur cette charge par suite d'un mouvement d'un opérateur, des moyens d'asservissement actionnés par le capteur d'effort, et un actionneur piloté par les moyens d'asservissement et relié au bras pour assister le mouvement de l'opérateur.- an assistance mechanism which includes a force sensor placed in a chosen location to detect a variation in the apparent weight of the load, as a result of a force exerted on this load following a movement of an operator, control means actuated by the force sensor, and an actuator controlled by the control means and connected to the arm to assist the movement of the operator.
Ainsi, l'invention réside dans la combinaison, d'une part, d'un équilibreur mécanique à faible temps de réponse, comprenant essentiellement un bras relié à des moyens d'équilibrage et, d'autre part, d'un mécanisme d'asservissement qui est couplé à ce bras pour assister la manutention d'une charge portée par le bras.Thus, the invention resides in the combination, on the one hand, of a mechanical balancer with low response time, essentially comprising an arm connected to balancing means and, on the other hand, of a mechanism for servo which is coupled to this arm to assist the handling of a load carried by the arm.
A titre d'exemple non limitatif, on peut utiliser un équilibreur, encore appelé dispositif d'équilibrage, du type décrit dans les Brevets français n° 84 08383 et 88 02423.By way of nonlimiting example, one can use a balancer, also called balancing device, of the type described in French Patents n ° 84 08383 and 88 02423.
De tels dispositifs, qui sont purement mécaniques, sont utilisés notamment pour équilibrer les forces agissant sur un bras sollicité par une charge, tel qu'un outil. Ils permettent alors d'obtenir un équilibrage rigoureux du bras, quelle que soit sa position angulaire par rapport au corps sur lequel il est articulé. Normalement, le bras peut pivoter de 360. par rapport au corps, ce qui permet à la charge de décrire une trajectoire circulaire.Such devices, which are purely mechanical, are used in particular to balance the forces acting on an arm stressed by a load, such as a tool. They then make it possible to obtain a rigorous balancing of the arm, whatever its angular position relative to the body on which it is articulated. Normally, the arm can rotate 360. relative to the body, allowing the load to follow a circular path.
Dans un dispositif d'équilibrage de ce type, l'opérateur peut déplacer la charge, par exemple un outil, pratiquement sans effort puisque le dispositif d'équilibrage compense les forces qui agissent sur le bras, et cela quelle que soit la position angulaire de ce dernier autour de son axe d'articulation en rotation, lequel est généralement horizontal.In a balancing device of this type, the operator can move the load, for example a tool, practically without effort since the balancing device compensates for the forces acting on the arm, regardless of the angular position of the latter around its axis of articulation in rotation, which is generally horizontal.
Dans l'invention, l'axe de rotation du bras de l'équilibreur est, de préférence, sensiblement horizontal.In the invention, the axis of rotation of the balancer arm is preferably substantially horizontal.
Le capteur d'effort est prévu pour détecter une variation de poids apparent de la charge. Il doit être en mesure de détecter une différence d'effort, même minime, générée par l'opérateur sur la charge, cette différence pouvant être de l'ordre de quelques centaines de grammes à quelques kilogrammes.The force sensor is designed to detect a variation in the apparent weight of the load. It must be able to detect a difference in force, even a small one, generated by the operator on the load, this difference possibly being of the order of a few hundred grams to a few kilograms.
Le capteur d'effort est avantageusement intégré à une structure mécanique déformable propre à ramener audit capteur la composante verticale des efforts résultant du poids de la charge. De manière préférentielle, cette structure mécanique déformable est interposée entre l'extrémité distale du bras et la charge, et elle comprend un parallélogramme.The force sensor is advantageously integrated into a deformable mechanical structure capable of bringing back to said sensor the vertical component of the forces resulting from the weight of the load. Preferably, this deformable mechanical structure is interposed between the distal end of the arm and the load, and it comprises a parallelogram.
Dans l'invention, le mécanisme d'assistance est prévu pour assurer une motorisation selon la verticale, dans un sens ou dans l'autre, à partir de la détection fournie par le capteur d'effort. Ceci permet d'assurer, par rapport aux dispositifs antérieurs, une réduction importante de l'hystérésis ainsi que des effets inertiels que les efforts de l'opérateur doivent compenser.In the invention, the assistance mechanism is provided to ensure motorization along the vertical, in one direction or the other, from the detection provided by the force sensor. This makes it possible, compared to previous devices, to ensure a significant reduction in hysteresis as well as inertial effects which the efforts of the operator must compensate.
Il est important de souligner que de tels résultats ne peuvent être obtenus que dans la mesure où le mécanisme d'assistance fournit une motorisation qui s ' applique sur une faible partie de la charge, alors que la majorité des efforts liés au poids sont compensés par l'équilibreur proprement dit, tant du point de vue de 1 ' effort résiduel que du point de vue du temps de réponse, sans apporter d'inertie ni de frottement sensible.It is important to underline that such results can only be obtained insofar as the assistance mechanism provides a motorization which is applied to a small part of the load, while the majority of the efforts linked to the weight are compensated by the balancer itself, both from the point of view of the residual force and from the point of view of the response time, without providing any inertia or appreciable friction.
Un équilibreur mécanique, tel que celui décrit dans les Brevets français précités, permet de procurer un tel équilibrage de haute précision.A mechanical balancer, such as that described in the aforementioned French Patents, makes it possible to provide such high precision balancing.
L' actionneur du mécanisme d'assistance est avantageusement relié à un support et à une biellette solidaire du bras.The actuator of the assistance mechanism is advantageously connected to a support and to a link secured to the arm.
Dans une forme de réalisation préférée de l'invention, 1 ' actionneur est un vérin pneumatique, en particulier d'un volume inférieur à 1dm3. Ce faible volume permet de conférer à ce vérin pneumatique des paramètres de fonctionnement, notamment au niveau du temps de réponse, qui le rendent compatible avec les caractéristiques nécessaires à un bon confort de manipulation pour l'opérateur.In a preferred embodiment of the invention, the actuator is a pneumatic cylinder, in particular with a volume of less than 1 dm 3 . This low volume makes it possible to give this pneumatic cylinder operating parameters, in particular at the level of the response time, which make it compatible with the characteristics necessary for good handling comfort for the operator.
Ce vérin pneumatique est avantageusement commandé par les moyens d'asservissement au travers d'une vanne proportionnelle.This pneumatic cylinder is advantageously controlled by the servo means through a proportional valve.
On comprendra que les moyens d'asservissement permettent de piloter 1 ' actionneur, par exemple un vérin pneumatique, qui assiste le mouvement souhaité par l'opérateur. Cette assistance se fait donc par simple pression exercée par l'opérateur directement sur la charge et non pas par action sur un bouton de commande .It will be understood that the control means make it possible to control the actuator, for example a pneumatic cylinder, which assists the movement desired by the operator. This assistance is therefore done by simple pressure exerted by the operator directly on the load and not by action on a control button.
Dans la description qui suit, faite seulement à titre d'exemple, on se réfère aux dessins annexés, sur lesquels :In the description which follows, given solely by way of example, reference is made to the appended drawings, in which:
- la figure 1 est un schéma d'un dispositif de manutention, selon une première forme de réalisation de l'invention ; et- Figure 1 is a diagram of a handling device, according to a first embodiment of the invention; and
- la figure 2 est un schéma d'un dispositif de manutention, selon une deuxième forme de réalisation de l'invention.- Figure 2 is a diagram of a handling device, according to a second embodiment of the invention.
On se réfère d'abord à la figure 1 qui représente un dispositif de manutention selon l'invention. Ce dispositif comprend un équilibreur mécanique 10, à faible temps de réponse, comportant un corps 12 fixé à un support 14 (lui-même fixe ou mobile). Le corps loge intérieurement des moyens d'équilibrage 16 qui peuvent être, par exemple, identiques ou analogues à ceux décrits dans le Brevet français 84 08383 ou le Brevet français 88 02423, déjà cités, auxquels il peut être fait référence pour plus amples informations .Reference is first made to FIG. 1 which represents a handling device according to the invention. This device comprises a mechanical balancer 10, with a low response time, comprising a body 12 fixed to a support 14 (itself fixed or mobile). The body internally houses balancing means 16 which may be, for example, identical or analogous to those described in French Patent 84 08383 or French Patent 88 02 423, already cited, to which reference may be made for further information.
Les moyens d'équilibrage 16 agissent sur un axe de rotation 18 porté par le corps 12 et s 'étendant, dans l'exemple, dans une direction sensiblement horizontale. L'équilibreur 10 comprend un bras 20 ayant une extrémité proximale 22 calée sur l'arbre 18 et une extrémité distale 24, encore appelée extrémité libre. Le bras 20 peut osciller autour de l'axe d'articulation 18, en sorte que son extrémité libre 24 décrive une trajectoire circulaire, le débattement du bras pouvant être compris entre 0 et 360°.The balancing means 16 act on an axis of rotation 18 carried by the body 12 and extending, in the example, in a substantially horizontal direction. The balancer 10 comprises an arm 20 having a proximal end 22 wedged on the shaft 18 and a distal end 24, also called free end. The arm 20 can oscillate around the articulation axis 18, so that its free end 24 follows a circular trajectory, the movement of the arm can be between 0 and 360 °.
L'extrémité 24 du bras 20 constitue une liaison articulée pour un organe de liaison 26 à l'extrémité de laquelle peut être accrochée une charge 28. Du fait de la liaison à articulation, le centre de gravité de toute la masse suspendue (organe de liaison 26 et charge 28) se positionne sans effort et, naturellement, à la verticale de l'extrémité 24 du bras.The end 24 of the arm 20 constitutes an articulated connection for a connection member 26 at the end of which a load can be hung 28. Due to the articulation connection, the center of gravity of all the suspended mass ( link 26 and load 28) is positioned effortlessly and, naturally, vertically from the end 24 of the arm.
Dans l'exemple, l'axe horizontal 18 constitue l'arbre de sortie de l'équilibreur mécanique 10 et produit un couple sinusoïdal.In the example, the horizontal axis 18 constitutes the output shaft of the mechanical balancer 10 and produces a sinusoidal torque.
Comme déjà indiqué, un tel équilibreur mécanique est en lui-même connu et peut être réalisé, à titre d'exemple, conformément à l'un ou l'autre des Brevets français cités précédemment.As already indicated, such a mechanical balancer is in itself known and can be produced, by way of example, in accordance with one or the other of the French Patents cited above.
Dans un dispositif d'équilibrage de ce type, les moyens d'équilibrage 16 sont ajustés pour fournir un équilibrage en fonction d'une charge définie et permettre ainsi à un opérateur de manutentionner ou manipuler cette charge sans effort particulier et avec un faible temps de réponse.In a balancing device of this type, the balancing means 16 are adjusted to provide balancing as a function of a defined load and thus allow an operator to handle or handle this load without particular effort and with a short time of reply.
Or, il arrive souvent que la charge portée par le bras varie dans le temps.However, it often happens that the load carried by the arm varies over time.
Un exemple est fourni dans une application où la charge est un dispositif de préhension qui possède son propre poids et auquel on peut accrocher, au cours d'un cycle d'opération, une ou plusieurs charges, dont le poids propre vient s'ajouter à celui du dispositif de préhension lui-même.An example is provided in an application where the load is a gripping device which has its own weight and to which one or more loads can be hung, during a cycle of operation, whose own weight is added to that of the gripping device itself.
II en résulte alors une différence de charge qui fait que la valeur de la charge n'est plus en correspondance de celle pour lequel l'équilibreur a été réglé au départ. En outre, un tel dispositif d'équilibrage génère généralement des frottements, même faibles, que doit vaincre l'opérateur lorsqu'il manipule la charge.This then results in a difference in load which means that the value of the load is no longer in correspondence with that for which the balancer was adjusted at the start. In addition, such a balancing device generally generates friction, even low, that the operator must overcome when handling the load.
L'invention permet précisément de tenir compte des variations de la charge et des frottements induits par l'équilibreur.The invention precisely makes it possible to take account of the variations in the load and the frictions induced by the balancer.
Pour cela, on prévoit en outre un mécanisme d'asservissement qui comprend tout d'abord un capteur d'effort 30, par exemple du type électrique, placé en un endroit choisi pour détecter une variation de poids apparent de la charge 28. Ce capteur d'effort doit être judicieusement intégré à l'organe de liaison 26, c'est-à-dire entre l'extrémité libre 24 du bras et la charge 28 elle-même .For this, there is further provided a servo mechanism which firstly comprises a force sensor 30, for example of the electrical type, placed at a location chosen to detect a variation in the apparent weight of the load 28. This sensor effort must be judiciously integrated into the connecting member 26, that is to say between the free end 24 of the arm and the load 28 itself.
Ce capteur d'effort mesure en permanence le poids de la charge 28 et transmet cette information à des moyens d'asservissement 32 qui sont ainsi actionnés par ce capteur d'effort. Ces moyens d'asservissement 32 pilotent un actionneur 34, lequel est relié au bras 20 pour assister le mouvement de l'opérateur. Dans l'exemple, 1 ' actionneur 34 est un vérin pneumatique dont une extrémité est fixée au support 14 et dont une autre extrémité est reliée à une biellette 36 solidaire du bras 20. Le vérin pneumatique agit ainsi de manière synchrone par rapport à l'équilibreur.This effort sensor continuously measures the weight of the load 28 and transmits this information to servo means 32 which are thus actuated by this effort sensor. These control means 32 control an actuator 34, which is connected to the arm 20 to assist the movement of the operator. In the example, the actuator 34 is a pneumatic cylinder, one end of which is fixed to the support 14 and the other end of which is connected to a link 36 secured to the arm 20. The pneumatic cylinder thus acts synchronously with respect to the balancer.
Le capteur 30 permet de détecter les différences de poids apparentes de la charge par rapport à une valeur de référence (ces petites différences sont dues à l'action d'un opérateur qui cherche à déplacer la charge 28 vers le bas où vers le haut) et régule la pression dans le vérin 34 de manière à aider l'opérateur dans le mouvement qu'il souhaite.The sensor 30 makes it possible to detect the apparent weight differences of the load compared to a reference value (these small differences are due to the action of an operator who seeks to move the load 28 downwards or upwards) and regulates the pressure in the cylinder 34 so as to assist the operator in the movement he wishes.
Le dispositif de manutention de la figure 1 représente un montage simple. Toutefois, il est possible de prévoir des montages plus sophistiqués, comme montré à la figure 2.The handling device of FIG. 1 represents a simple assembly. However, it is possible to provide more sophisticated arrangements, as shown in FIG. 2.
Sur cette figure, on retrouve, comme dans la figure 1, un équilibreur 10 ayant un bras 20, articulé autour d'un axe 18 et un mécanisme d'assistance identique ou analogue à celui décrit précédemment et comprenant un capteur d'effort 30, des moyens d'asservissement 32 et un actionneur 34 interposé entre le support 14 et une biellette 36, solidaire du bras 20.In this figure, we find, as in Figure 1, a balancer 10 having an arm 20, articulated around an axis 18 and an assistance mechanism identical or similar to that described above and comprising a force sensor 30, servo means 32 and an actuator 34 interposed between the support 14 and a link 36, integral with the arm 20.
Toutefois, le bras 20 et le capteur d'effort 30 s'inscrivent dans un montage plus sophistiqué.However, the arm 20 and the force sensor 30 are part of a more sophisticated assembly.
La charge 28 est supportée verticalement par un organe de liaison 38 porté à l'extrémité 40 d'un bras horizontal 42 dont une autre extrémité 44 est montée à l'extrémité inférieure d'un axe vertical 46 susceptible de pivoter sur lui-même, en sorte que le bras 42 peut décrire un mouvement de rotation par rapport à l'axe 46. Cet axe 46 est fixé à un mécanisme à parallélogramme 68 qui comprend deux bielles parallèles 48 et 50, sensiblement horizontales, articulées respectivement par des points 52 et 54 sur l'axe 46 et par des points 56 et 58 sur un axe vertical 60. Cet axe 60 est articulé sur l'extrémité 24 du bras 20 de l'équilibreur et est articulé en 62 à l'extrémité d'un bras 64 monté en parallèle avec le bras 20 et articulé par un point 66 sur le support. Ainsi, l'axe 60 forme, en combinaison avec le bras et le bras 64, une structure à parallélogramme déformable, dans laquelle l'axe 60 reste vertical.The load 28 is supported vertically by a connecting member 38 carried at the end 40 of a horizontal arm 42, another end 44 of which is mounted at the lower end of a vertical axis 46 capable of pivoting on itself, so that the arm 42 can describe a rotational movement relative to the axis 46. This axis 46 is fixed to a parallelogram mechanism 68 which comprises two substantially connecting rods 48 and 50, substantially horizontal, articulated respectively by points 52 and 54 on the axis 46 and by points 56 and 58 on a vertical axis 60. This axis 60 is articulated on the end 24 of the arm 20 of the balancer and is articulated at 62 at the end of an arm 64 mounted in parallel with the arm 20 and articulated by a point 66 on the support. Thus, the axis 60 forms, in combination with the arm and the arm 64, a deformable parallelogram structure, in which the axis 60 remains vertical.
Les axes verticaux 46 et 60, ainsi que les bielles 48 et 50 (encore appelés axes horizontaux) constituent une structure mécanique déformable dudit parallélogramme 68. La bielle 48 est maintenue en position horizontale par 1 ' intermédiaire du capteur d'effort 30, lequel est fixé à l'extrémité 70 d'une barre 72, fixée rigidement en 74 sur l'axe vertical 60.The vertical axes 46 and 60, as well as the connecting rods 48 and 50 (also called horizontal axes) constitute a deformable mechanical structure of said parallelogram 68. The connecting rod 48 is held in horizontal position by means of the force sensor 30, which is fixed at the end 70 of a bar 72, rigidly fixed at 74 on the vertical axis 60.
Le capteur d'effort 30 se déforme très légèrement en fonction de l'effort auquel il est soumis et qu'il mesure. L'horizontalité de la bielle 48 n'est pas rigoureusement parfaite, mais suffisante pour ne pas fausser le fonctionnement du mécanisme, compte tenu de l'ordre de grandeur des valeurs de la mesure nécessaire à son bon fonctionnement. Il est essentiel que le parallélogramme déformable 68 assure la verticalité de l'axe 46, tout en ramenant au capteur la seule composante verticale des efforts générés par le poids de la charge, quelle que soit la position de celle-ci par rapport à l'axe vertical 46, aussi bien en rotation autour de cet axe 46 qu'en translation radiale par rapport à ce même axe 46.The force sensor 30 deforms very slightly as a function of the force to which it is subjected and which it measures. The horizontality of the connecting rod 48 is not strictly perfect, but sufficient not to distort the operation of the mechanism, taking into account the order of magnitude of the values of the measurement necessary for its proper operation. It is essential that the deformable parallelogram 68 ensures the verticality of the axis 46, while reducing to the sensor the only vertical component of the forces generated by the weight of the load, whatever the position of the latter relative to the vertical axis 46, both in rotation about this axis 46 and in radial translation relative to this same axis 46.
Par ailleurs, l'axe 60 assure une rotation libre de l'ensemble sur les points 56, 58, 24 et 62.Furthermore, the axis 60 ensures free rotation of the assembly on points 56, 58, 24 and 62.
L'axe 60 ainsi que les bras 20 et 64 constituent un parallélogramme déformable 76 qui maintient cet axe 60 vertical.The axis 60 as well as the arms 20 and 64 constitute a deformable parallelogram 76 which keeps this axis 60 vertical.
Ainsi, comme dans la forme de réalisation précédente, l'équilibreur 10 assure la compensation de la majeure partie du poids de la charge ainsi que de la structure mécanique composant les deux parallélogrammes 68 et 76.Thus, as in the previous embodiment, the balancer 10 provides compensation for the major part of the weight of the load as well as for the mechanical structure composing the two parallelograms 68 and 76.
Le capteur 30 mesure en permanence le poids de la charge et transmet la valeur aux moyens d'asservissement 32 qui, eux- mêmes, pilotent 1 ' actionneur 34, de la même manière que dans la forme de réalisation précédente.The sensor 30 continuously measures the weight of the load and transmits the value to the servo means 32 which, themselves, drive the actuator 34, in the same manner as in the previous embodiment.
Bien entendu, l'invention n'est pas limitée aux formes de réalisation décrites précédemment à titre d'exemples et s'étend à d'autres variantes.Of course, the invention is not limited to the embodiments described above by way of examples and extends to other variants.
On comprendra que 1 ' équilibreur lui-même est susceptible de nombreuses variantes, et qu'il n'est pas limité à un équilibreur mécanique du type de ceux décrits dans les Brevets français mentionnés précédemment.It will be understood that the balancer itself is susceptible to numerous variants, and that it is not limited to a mechanical balancer of the type of those described in the French Patents mentioned above.
Ainsi, dans l'exemple, l'axe de rotation, ou arbre de sortie, de l'équilibreur est utilisé comme base, soit d'un bras oscillant, soit d'un parallélogramme. Cependant, on peut envisager d'autres montages, en particulier un montage où l'équilibreur n'est pas intégré à la structure du dispositif et où une transmission assure la synchronisation des mouvements et donc des efforts. De même, le mécanisme d'assistance est susceptible de nombreuses variantes et il est possible de prévoir d'autres moyens d'asservissement que ceux décrits précédemment.Thus, in the example, the axis of rotation, or output shaft, of the balancer is used as the base, either of an oscillating arm, or of a parallelogram. However, other arrangements can be envisaged, in particular an arrangement where the balancer is not integrated into the structure of the device and where a transmission ensures synchronization of the movements and therefore of the forces. Similarly, the assistance mechanism is susceptible of numerous variants and it is possible to provide other control means than those described above.
Bien que 1 ' actionneur soit de préférence un vérin pneumatique, il est envisagé d'utiliser d'autres types d ' actionneurs susceptibles de procurer une motorisation du bras . Although the actuator is preferably a pneumatic cylinder, it is envisaged to use other types of actuators capable of providing motorization of the arm.

Claims

Revendications claims
1. Dispositif de manutention d'une charge, caractérisé en ce qu'il comprend en combinaison :1. A load handling device, characterized in that it comprises in combination:
un équilibreur mécanique (10) à faible temps de réponse, comportant des moyens d'équilibrage (16) agissant sur un axe de rotation (18), ainsi qu'un bras (20) dont une extrémité proximale (22) est calée sur l'axe de rotation et dont une extrémité distale (26) est propre à supporter la charge (10), eta mechanical balancer (10) with low response time, comprising balancing means (16) acting on an axis of rotation (18), as well as an arm (20) of which a proximal end (22) is wedged on the 'axis of rotation and a distal end (26) of which is capable of supporting the load (10), and
un capteur d'effort (30) placé en un endroit choisi pour détecter une variation de poids apparent de la charge (10), en conséquence d'une force exercée sur cette charge par suite d'un mouvement d'un opérateur, des moyens d'asservissement (32) actionnés par le capteur d'effort (30), et un actionneur (34) piloté par les moyens d'asservissement (32) et relié au bras (20) pour assister le mouvement de l'opérateur.a force sensor (30) placed at a location chosen to detect an apparent change in weight of the load (10), as a result of a force exerted on this load as a result of a movement of an operator, means servo (32) actuated by the force sensor (30), and an actuator (34) controlled by the servo means (32) and connected to the arm (20) to assist the movement of the operator.
2. Dispositif selon la revendication 1, caractérisé en ce que l'axe de rotation (18) du bras (20) de l'équilibreur est sensiblement horizontal.2. Device according to claim 1, characterized in that the axis of rotation (18) of the arm (20) of the balancer is substantially horizontal.
3. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que le capteur d'effort (30) est intégré à une structure mécanique déformable (68) propre à ramener audit capteur la composante verticale des efforts résultant du poids de la charge (10).3. Device according to one of claims 1 and 2, characterized in that the force sensor (30) is integrated into a deformable mechanical structure (68) capable of bringing back to said sensor the vertical component of the forces resulting from the weight of the load (10).
4. Dispositif selon la revendication 3, caractérisé en ce que la structure mécanique déformable (68) est interposée entre l'extrémité distale (24) du bras (20) et la charge (10) et comprend un parallélogramme (46, 48, 50, 60).4. Device according to claim 3, characterized in that the deformable mechanical structure (68) is interposed between the distal end (24) of the arm (20) and the load (10) and comprises a parallelogram (46, 48, 50 , 60).
5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que 1 ' actionneur (34) est relié à un support (14) et a une biellette (36) solidaire du bras (20). 5. Device according to one of claims 1 to 4, characterized in that one actuator (34) is connected to a support (14) and has a link (36) secured to the arm (20).
6. Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que 1 ' actionneur (34) est un vérin pneumatique, en particulier d'un volume inférieur à 1dm3, commandé par les moyens d'asservissement (32) via une vanne proportionnelle (84). 6. Device according to one of claims 1 to 5, characterized in that 1 actuator (34) is a pneumatic cylinder, in particular with a volume less than 1dm 3 , controlled by the servo means (32) via a proportional valve (84).
EP01911844A 2000-03-09 2001-03-05 Load handling device with servo feed-back control Withdrawn EP1261463A1 (en)

Applications Claiming Priority (3)

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FR0003047A FR2806025B1 (en) 2000-03-09 2000-03-09 LOAD HANDLING DEVICE WITH CONTROLLED CONTROL
FR0003047 2000-03-09
PCT/FR2001/000642 WO2001066318A1 (en) 2000-03-09 2001-03-05 Load handling device with servo feed-back control

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US20030152453A1 (en) 2003-08-14
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WO2001066318A1 (en) 2001-09-13
US6997668B2 (en) 2006-02-14

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