EP0296047B1 - Multi-stage actuator with at least three sliding elements and telescopic jib incorporating this actuator - Google Patents

Multi-stage actuator with at least three sliding elements and telescopic jib incorporating this actuator Download PDF

Info

Publication number
EP0296047B1
EP0296047B1 EP19880401457 EP88401457A EP0296047B1 EP 0296047 B1 EP0296047 B1 EP 0296047B1 EP 19880401457 EP19880401457 EP 19880401457 EP 88401457 A EP88401457 A EP 88401457A EP 0296047 B1 EP0296047 B1 EP 0296047B1
Authority
EP
European Patent Office
Prior art keywords
section
conduit
piston
cylinder
chamber
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.)
Expired - Lifetime
Application number
EP19880401457
Other languages
German (de)
French (fr)
Other versions
EP0296047A1 (en
Inventor
Robert Baraniak
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.)
PPM SA
Original Assignee
PPM SA
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 PPM SA filed Critical PPM SA
Publication of EP0296047A1 publication Critical patent/EP0296047A1/en
Application granted granted Critical
Publication of EP0296047B1 publication Critical patent/EP0296047B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/16—Characterised by the construction of the motor unit of the straight-cylinder type of the telescopic type

Definitions

  • Patent abstracts of Japan, volume 7, No 31 JP-A-57 184 709 describes such a jack.
  • the invention firstly aims to specify the provisions defined in the characterizing part of claim 1.
  • the jack comprises a calibrated relief valve connected in bypass to said fifth conduit.
  • the invention also more particularly relates to a telescopic boom comprising a first internal section, a second intermediate section, inside which the first section is slidably mounted, and a third section, external, inside. which the second section is slidably mounted, while a cylinder as described above is mounted therein, longitudinally inside the three said sections, the first cylinder being integral with the first section, the second cylinder being integral with the second section and the piston rod being integral with the third section.
  • the first cylinder is fixed on the internal end of the first section
  • the second cylinder is fixed on the internal end of the second section
  • the piston rod is fixed on the part of the third section, which is opposite to the axial opening of this third section through which the second section penetrates.
  • the main advantage of the invention lies in the possibility of obtaining simultaneous displacements and at equal relative speeds of the elements of the jack, and of the boom sections, without having to resort to complicated, heavy, expensive and fragile mechanical assemblies.
  • the second conduit 16 and the third conduit 18 open to the outside of the piston rod 12 by fittings 20, 21, respectively.
  • the setting of the relief valve 53 is higher, for example by 20 bars, than that of the pressure switch 47, and is equal to 350 bars, that of the pressure switch being equal to 330 bars. This implies that, as long as the pressure in the conduit 57 is greater than 330 bars, the pressure switch 47 does not make the electrical connection between its terminals 48 and 49, and the electromagnetic device 45 is not excited, so that, under the unique effect of the spring 46, the fluid distributor 44 is placed in its first position.
  • the jack which has just been described, is placed inside a telescopic boom with three sections, the axis 32 of the jack substantially coinciding with the axis of this arrow.
  • This consists of a first internal section 33, a second intermediate section 34 and a third external section 35, slidably mounted, the first section 33 inside the second section 34, into which it enters through an opening 34a, and the second section 34 inside the third section 35, into which it enters through an opening 35a.
  • Sliding members, rollers or sliding pads make these sliding possible.
  • these are rollers 36 and 37, mounted inside the second section 34 and the third section 35, respectively, near their respective openings, and rollers 38 and 39, mounted at the outside the first section 33 and the second section 34, respectively, near their respective bottoms, opposite the openings 33a and 34a of these sections.
  • first (1) and second (7) cylinders are extended by sails, which are fixed (3a, 8a) to the internal ends of the first (33) and second (34) sections of the boom telescopic and constitute the bottoms of these respective sections.
  • the third section 35 is closed by a bottom 40, on which is fixed (41) the end of the piston rod 12.
  • the section S10 of the second large chamber 10 is, in the embodiment described, equal to the section S6 of the first small chamber 6. Because these two chambers are in permanent communication with one another, and with no other chamber, the volume of fluid which leaves one of these two chambers (or which enters it) is necessarily received in the other chamber (or leaves it).
  • the sections S10 and S6 are equal, this implies that the second cylinder 7 moves with respect to the second piston 9 at the same speed and simultaneously with the displacement of the first cylinder 1 with respect to the first piston 4.
  • the outputs or the simultaneous re-entries and at the same speed of the first section 33 of the boom relative to the second section 34, and of the second section 34 relative to the third section 35 which is desirable for the application described for telescopic crane jibs.
  • the relative strokes C 33/34 and C 34/35 of the first section 33 relative to the second section 34, and of the second section 34 relative to the third section 35 are also equal.
  • the sum of the volumes of the first small chamber 6 and the second large chamber 10 was assumed to be constant. In reality, inevitable leaks cause slight variations in the value of this sum of volumes, and it is often necessary to supplement the quantity of fluid contained in these chambers, or, on the contrary, to allow an evacuation of excess fluid. This complement or this evacuation of fluid is carried out automatically in the following manner.
  • the three-position distributor 24 is assumed to have been placed in its first position.
  • the pressure of this fluid decreases and becomes lower than the setting pressure of the pressure switch 47, which causes the electrical connection between the two terminals 48, 49 and, consequently, the supply of electrical energy to the electromagnetic device 45, which places the fluid distributor in two positions 44 in its second position.
  • this pressure switch cuts off the supply of electrical energy to the electromagnetic device 45: the two-position fluid distributor 44 is returned to its first position under the effect of the spring 46, which causes the complementary supply of fluid to stop, via the conduit 42, in the second large chamber 10.
  • the pressure of this fluid increases until reaching the value of the setting pressure of the relief valve 53: by means of this relief valve 53, the maximum pressure in the second large chamber 10 is limited to a value making it possible to prohibit any deterioration of the jack.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Actuator (AREA)
  • Jib Cranes (AREA)

Description

On connaît déjà des vérins multiples à au moins trois éléments montés coulissants les uns par rapport aux autres, tel celui défini dans le préambule de la revendication 1 de la présente demande de brevet.There are already known multiple jacks with at least three elements slidably mounted relative to one another, such as that defined in the preamble of claim 1 of this patent application.

Patent abstracts of Japan, volume 7, No 31 JP-A-57 184 709 décrit un tel vérin.Patent abstracts of Japan, volume 7, No 31 JP-A-57 184 709 describes such a jack.

L'invention a d'abord pour objet de préciser les dispositions définies dans la partie caractérisante de la revendication 1.The invention firstly aims to specify the provisions defined in the characterizing part of claim 1.

L'avantageuse disposition suivante est en outre préférentiellement adoptée: le vérin comporte un clapet de décharge taré relié en dérivation audit cinquième conduit.The advantageous arrangement below is also preferentially adopted: the jack comprises a calibrated relief valve connected in bypass to said fifth conduit.

L'invention a également, plus particulièrement, pour objet une flèche télescopique comportant un premier tronçon, interne, un deuxième tronçon, intermédiaire, à l'intérieur duquel le premier tronçon est monté coulissant, et un troisième tronçon, externe, à l'intérieur duquel le deuxième tronçon est monté coulissant, cependant qu'un vérin tel que décrit précédemment y est monté, longitudinalement à l'intérieur des trois dits tronçons, le premier cylindre étant solidaire du premier tronçon, le deuxième cylindre étant solidaire du deuxième tronçon et la tige de piston étant solidaire du troisième tronçon.The invention also more particularly relates to a telescopic boom comprising a first internal section, a second intermediate section, inside which the first section is slidably mounted, and a third section, external, inside. which the second section is slidably mounted, while a cylinder as described above is mounted therein, longitudinally inside the three said sections, the first cylinder being integral with the first section, the second cylinder being integral with the second section and the piston rod being integral with the third section.

De manière préférée, le premier cylindre est fixé sur l'extrémité interne du premier tronçon, le deuxième cylindre est fixé sur l'extrémité interne du deuxième tronçon et la tige de piston est fixée sur la partie du troisième tronçon, qui est opposée à l'ouverture axiale de ce troisième tronçon par laquelle pénètre le deuxième tronçon.Preferably, the first cylinder is fixed on the internal end of the first section, the second cylinder is fixed on the internal end of the second section and the piston rod is fixed on the part of the third section, which is opposite to the axial opening of this third section through which the second section penetrates.

L'avantage principal de l'invention réside dans la possibilité d'obtenir des déplacements simultanés et à vitesses relatives égales des éléments du vérin, et des tronçons de flèche, sans avoir recours à des montages mécaniques compliqués, lourds, coûteux et fragiles.The main advantage of the invention lies in the possibility of obtaining simultaneous displacements and at equal relative speeds of the elements of the jack, and of the boom sections, without having to resort to complicated, heavy, expensive and fragile mechanical assemblies.

L'invention sera mieux comprise, et des caractéristiques secondaires et leurs avantages apparaîtront au cours de la description d'une réalisation donnée ci-dessous à titre d'exemple.The invention will be better understood, and secondary characteristics and their advantages will appear during the description. of an embodiment given below by way of example.

Il sera fait référence au dessin annexé, dans lequel la figure unique est une coupe axiale schématique d'un vérin et d'une flèche télescopique conformes à l'invention.Reference will be made to the accompanying drawing, in which the single figure is a schematic axial section of a jack and a telescopic boom in accordance with the invention.

Le vérin représenté sur la figure comprend:

  • _ un premier cylindre 1 comportant à chaque extrémité un fond 2, 3;
  • _ un premier piston 4, qui est monté coulissant à l'intérieur du premier cylindre 1 et qui y délimite, en coopération avec le fond 2, une première grande chambre 5 de grande section utile S5, et, en coopération avec le fond 3, une première petite chambre 6 de petite section utile S6 (inférieure à la section utile S5);
  • _ un deuxième cylindre 7 qui comporte, à une extrémité, un fond constitué par le premier piston 4 et, à l'autre extrémité, un fond 8 qui est solidaire du premier piston 4, et qui traverse avec étanchéité 3b le fond 3 du premier cylindre 1 qui, en coopération avec le premier piston 4, délimite la première petite chambre utile 6;
  • _ un deuxième piston 9, qui est monté coulissant à l'intérieur du deuxième cylindre 7 et qui y délimite, en coopération avec le premier piston 4, une deuxième grande chambre 10 de grande section utile S10, et, en coopération avec le fond 8 du deuxième cylindre, une deuxième petite chambre 11 de petite section utile S11 (inférieure à la section utile S10);
  • _ une tige de piston 12, qui est solidaire du deuxième piston 9 et qui traverse avec étanchéité 8b le fond 8 du deuxième cylindre, qui, en coopération avec le deuxième piston 9, délimite la deuxième petite chambre 11;
  • _ un premier passage 13, qui est ménagé dans le premier piston 4 et qui réalise la communication permanente de la deuxième grande chambre 10 avec la première petite chambre 6;
  • _ un deuxième passage, constitué par un premier conduit 14, solidaire du premier piston 4, traversant ce premier piston (trou 15) et débouchant ainsi dans la première grande chambre 5, et par un deuxième conduit 16, solidaire du deuxième piston 9, contenu dans la tige de piston 12, traversant ce deuxième piston (trou 17) et débouchant dans la deuxième grande chambre 10, le premier conduit 14 coulissant avec étanchéité 17b à l'intérieur dudit deuxième conduit 16; et
  • _ un troisième passage, qui est constitué par un troisième conduit 18, ménagé à l'intérieur de la tige de piston 12, et par un quatrième conduit 19, ménagé dans le deuxième piston 9 et reliant en permanence le troisième conduit 18 à la deuxième petite chambre 11.
The jack shown in the figure includes:
  • _ a first cylinder 1 comprising at each end a bottom 2, 3;
  • _ a first piston 4, which is slidably mounted inside the first cylinder 1 and which defines therein, in cooperation with the bottom 2, a first large chamber 5 of large useful section S5, and, in cooperation with the bottom 3, a first small chamber 6 of small useful section S6 (lower than the useful section S5);
  • _ a second cylinder 7 which comprises, at one end, a bottom formed by the first piston 4 and, at the other end, a bottom 8 which is integral with the first piston 4, and which crosses with seal 3b the bottom 3 of the first cylinder 1 which, in cooperation with the first piston 4, delimits the first small useful chamber 6;
  • _ a second piston 9, which is slidably mounted inside the second cylinder 7 and which defines therein, in cooperation with the first piston 4, a second large chamber 10 of large useful section S10, and, in cooperation with the bottom 8 of the second cylinder, a second small chamber 11 of small useful section S11 (less than the useful section S10);
  • _ a piston rod 12, which is integral with the second piston 9 and which crosses with seal 8b the bottom 8 of the second cylinder, which, in cooperation with the second piston 9, delimits the second small chamber 11;
  • _ a first passage 13, which is formed in the first piston 4 and which carries out the permanent communication of the second large chamber 10 with the first small chamber 6;
  • _ a second passage, constituted by a first conduit 14, integral with the first piston 4, passing through this first piston (hole 15) and thus opening into the first large chamber 5, and through a second conduit 16, integral with the second piston 9, contained in the piston rod 12, passing through this second piston (hole 17) and opening into the second large chamber 10, the first duct 14 sliding with seal 17b inside said second duct 16; and
  • _ a third passage, which is constituted by a third conduit 18, formed inside the piston rod 12, and by a fourth conduit 19, formed in the second piston 9 and permanently connecting the third conduit 18 to the second small room 11.

Le deuxième conduit 16 et le troisième conduit 18 débouchent à l'extérieur de la tige de piston 12 par des raccords 20, 21, respectivement.The second conduit 16 and the third conduit 18 open to the outside of the piston rod 12 by fittings 20, 21, respectively.

Le circuit d'alimentation du vérin est lui-même constitué par:

  • _ un réservoir de fluide 22;
  • _ une pompe 23;
  • _ un distributeur à trois positions 24;
  • _ un clapet de décharge taré 25;
  • _ le conduit d'aspiration 26 et le conduit de refoulement 27 de la pompe 23, qui la relient au réservoir 22 et au distributeur 24, respectivement;
  • _ des conduits 28 et 29, qui relient le distributeur 24 aux raccords 20, 21, respectivement;
  • _ un conduit 30, qui relie le distributeur 24 au réservoir 22; et
  • _ un conduit 31, qui relie le conduit de refoulement 27 au réservoir 22 et sur lequel est placé le clapet de décharge taré 25.
The cylinder supply circuit is itself constituted by:
  • _ a fluid reservoir 22;
  • _ a pump 23;
  • _ a three-position distributor 24;
  • _ a calibrated relief valve 25;
  • _ the suction pipe 26 and the delivery pipe 27 of the pump 23, which connect it to the reservoir 22 and to the distributor 24, respectively;
  • _ conduits 28 and 29, which connect the distributor 24 to the connections 20, 21, respectively;
  • _ a conduit 30, which connects the distributor 24 to the reservoir 22; and
  • _ a conduit 31, which connects the discharge conduit 27 to the reservoir 22 and on which is placed the calibrated relief valve 25.

Les trois positions du distributeur 24 correspondent:

  • _ la première position, aux mises en communication des conduits 27 et 28, et des conduits 29 et 30;
  • _ la deuxième position, à l'obturation des conduits 28 et 29, et à la mise en communication des conduits 27 et 30; et
  • _ la troisième position, aux mises en communication des conduits 27 et 29, et des conduits 28 et 30.
The three positions of the distributor 24 correspond:
  • _ the first position, when the conduits 27 and 28 and the conduits 29 and 30 are put into communication;
  • _ the second position, closing the conduits 28 and 29, and connecting the conduits 27 and 30; and
  • _ the third position, the connections between conduits 27 and 29, and conduits 28 and 30.

Un circuit de réglage du volume de fluide contenu dans les chambres 10 et 6 est également prévu et est constitué par:

  • _ un cinquième conduit 42, interne à la tige de piston 12, qui débouche dans la deuxième grande chambre 10 et la relie à un raccord extérieur 43;
  • _ un distributeur de fluide à deux positions 44, muni d'un dispositif électromagnétique 45 de réglage de sa position, dont l'effet, lorsqu'il est excité, est antagoniste de celui d'un ressort de rappel 46;
  • _ un manocontact 47 à deux bornes électriques 48, 49, à un raccord hydraulique 50 et à un ressort de rappel 51 d'effet antagoniste de celui du fluide sous pression contenu dans le raccord hydraulique 50;
  • _ une terre électrique 52;
  • _ un clapet de décharge taré 53;
  • _ un conduit de liaison 54, reliant le distributeur de fluide à deux positions 44 au conduit 28;
  • _ un conduit de complément d'alimentation 55, reliant le distributeur de fluide à deux positions au raccord extérieur 43;
  • _ un conduit 56, reliant le conduit de complément d'alimentation 55 au réservoir de fluide 22, le clapet de décharge taré 53 étant disposé sur ce conduit 56;
  • _ un conduit 57, reliant le raccord hydraulique 50 du manocontact 47 au conduit de complément d'alimentation 55;
  • _ une liaison électrique 58 reliant la borne 48 du manocontact 47 au dispositif électromagnétique 45;
  • _ une liaison électrique 59 reliant l'autre borne 49 du manocontact 47 à la borne positive (+) d'une source d'énergie électrique 60; et
  • _ une liaison électrique 61 reliant la borne négative (_) de la source d'énergie électrique 60 à la terre électrique 52.
A circuit for adjusting the volume of fluid contained in the chambers 10 and 6 is also provided and consists of:
  • _ a fifth conduit 42, internal to the piston rod 12, which opens into the second large chamber 10 and connects it to an external connector 43;
  • _ a two-position fluid distributor 44, fitted with an electromagnetic device 45 for adjusting its position, the effect of which, when energized, is antagonistic to that of a return spring 46;
  • _ a pressure switch 47 with two electrical terminals 48, 49, a hydraulic connection 50 and a return spring 51 with an effect antagonistic to that of the pressurized fluid contained in the hydraulic connection 50;
  • _ an electric earth 52;
  • _ a calibrated relief valve 53;
  • _ a connecting duct 54, connecting the two-position fluid distributor 44 to the duct 28;
  • _ a supply complement duct 55, connecting the two-position fluid distributor to the external connector 43;
  • _ a conduit 56, connecting the additional supply conduit 55 to the fluid reservoir 22, the calibrated relief valve 53 being disposed on this conduit 56;
  • _ a conduit 57, connecting the hydraulic connection 50 of the pressure switch 47 to the supply complement conduit 55;
  • _ an electrical connection 58 connecting terminal 48 of pressure switch 47 to electromagnetic device 45;
  • _ an electrical connection 59 connecting the other terminal 49 of the pressure switch 47 to the positive (+) terminal of an electrical energy source 60; and
  • _ an electrical connection 61 connecting the negative terminal (_) of the electrical energy source 60 to the electrical ground 52.

Le tarage du clapet de décharge 53 est supérieur, par exemple de 20 bars, à celui du manocontact 47, et est égal à 350 bars, celui du manocontact étant égal à 330 bars. Ceci implique que, tant que la pression dans le conduit 57 est supérieure à 330 bars, le manocontact 47 ne réalise pas la liaison électrique entre ses bornes 48 et 49, et le dispositif électromagnétique 45 n'est pas excité, de sorte que, sous l'effet unique du ressort 46, le distributeur de fluide 44 est placé dans sa première position.The setting of the relief valve 53 is higher, for example by 20 bars, than that of the pressure switch 47, and is equal to 350 bars, that of the pressure switch being equal to 330 bars. This implies that, as long as the pressure in the conduit 57 is greater than 330 bars, the pressure switch 47 does not make the electrical connection between its terminals 48 and 49, and the electromagnetic device 45 is not excited, so that, under the unique effect of the spring 46, the fluid distributor 44 is placed in its first position.

Les deux positions de ce distributeur de fluide 44 correspondent:

  • _ la première position, aux obturations du conduit de liaison 54 et du conduit de complément d'alimentation 55; et
  • _ la deuxième position, à la mise en communication du conduit de liaison 54 et du conduit de complément d'alimentation 55.
The two positions of this fluid distributor 44 correspond:
  • _ the first position, to the obturations of the connecting duct 54 and the supply complement duct 55; and
  • _ the second position, when the connecting pipe 54 and the additional supply pipe 55 are placed in communication.

Par ailleurs, le vérin, qui vient d'être décrit, est placé à l'intérieur d'une flèche télescopique à trois tronçons, l'axe 32 du vérin coïncidant sensiblement avec l'axe de cette flèche.Furthermore, the jack, which has just been described, is placed inside a telescopic boom with three sections, the axis 32 of the jack substantially coinciding with the axis of this arrow.

Celle-ci est constituée par un premier tronçon interne 33, un deuxième tronçon intermédiaire 34 et un troisième tronçon externe 35, montés coulissants, le premier tronçon 33 à l'intérieur du deuxième tronçon 34, dans lequel il pénètre par une ouverture 34a, et le deuxième tronçon 34 à l'intérieur du troisième tronçon 35, dans lequel il pénètre par une ouverture 35a. Des organes de coulissement, galets ou patins de glissement, rendent possibles ces coulissements. Il s'agit, dans la réalisation décrite, des galets 36 et 37, montés à l'intérieur du deuxième tronçon 34 et du troisième tronçon 35, respectivement, à proximité de leurs ouvertures respectives, et des galets 38 et 39, montés à l'extérieur du premier tronçon 33 et du deuxième tronçon 34, respectivement, à proximité de leurs fonds respectifs, opposés aux ouvertures 33a et 34a de ces tronçons.This consists of a first internal section 33, a second intermediate section 34 and a third external section 35, slidably mounted, the first section 33 inside the second section 34, into which it enters through an opening 34a, and the second section 34 inside the third section 35, into which it enters through an opening 35a. Sliding members, rollers or sliding pads, make these sliding possible. In the embodiment described, these are rollers 36 and 37, mounted inside the second section 34 and the third section 35, respectively, near their respective openings, and rollers 38 and 39, mounted at the outside the first section 33 and the second section 34, respectively, near their respective bottoms, opposite the openings 33a and 34a of these sections.

A noter que les fonds 3 et 8 des premier (1) et deuxième (7) cylindres sont prolongés par des voiles, qui sont fixés (3a, 8a) aux extrémités internes des premier (33) et deuxième (34) tronçons de la flèche télescopique et constituent les fonds de ces tronçons respectifs. Enfin, à l'opposé de son ouverture 35a, le troisième tronçon 35 est fermé par un fond 40, sur lequel est fixée (41) l'extrémité de la tige de piston 12.Note that the bottoms 3 and 8 of the first (1) and second (7) cylinders are extended by sails, which are fixed (3a, 8a) to the internal ends of the first (33) and second (34) sections of the boom telescopic and constitute the bottoms of these respective sections. Finally, opposite its opening 35a, the third section 35 is closed by a bottom 40, on which is fixed (41) the end of the piston rod 12.

La section S10 de la deuxième grande chambre 10 est, dans la réalisation décrite, égale à la section S6 de la première petite chambre 6. Du fait que ces deux chambres sont en communication permanente entre elles, et avec aucune autre chambre, le volume de fluide qui sort de l'une de ces deux chambres (ou qui y pénètre) est nécessairement reçu dans l'autre chambre (ou en sort). Lorsque les sections S10 et S6 sont égales, cela implique que le deuxième cylindre 7 se déplace par rapport au deuxième piston 9 à la même vitesse et simultanément au déplacement du premier cylindre 1 par rapport au premier piston 4. On obtient donc également les sorties ou les rentrées simultanées et à la même vitesse du premier tronçon 33 de la flèche par rapport au deuxième tronçon 34, et du deuxième tronçon 34 par rapport au troisième tronçon 35, ce qui est souhaitable pour l'application décrite aux flèches télescopiques de grue. Les courses relatives C 33/34 et C 34/35 du premier tronçon 33 par rapport au deuxième tronçon 34, et du deuxième tronçon 34 par rapport au troisième tronçon 35 sont en outre égales.The section S10 of the second large chamber 10 is, in the embodiment described, equal to the section S6 of the first small chamber 6. Because these two chambers are in permanent communication with one another, and with no other chamber, the volume of fluid which leaves one of these two chambers (or which enters it) is necessarily received in the other chamber (or leaves it). When the sections S10 and S6 are equal, this implies that the second cylinder 7 moves with respect to the second piston 9 at the same speed and simultaneously with the displacement of the first cylinder 1 with respect to the first piston 4. The outputs or the simultaneous re-entries and at the same speed of the first section 33 of the boom relative to the second section 34, and of the second section 34 relative to the third section 35, which is desirable for the application described for telescopic crane jibs. The relative strokes C 33/34 and C 34/35 of the first section 33 relative to the second section 34, and of the second section 34 relative to the third section 35 are also equal.

Mais on comprend bien qu'il suffit de modifier le rapport des sections S6/S10, pour, par exemple, si la section S6 était égale à la moitié de la section S10 [S6 = (S10) × 0,5Ω, obtenir une vitesse de sortie, et une course, du premier tronçon 33 par rapport au deuxième tronçon 34, égales à deux fois la vitesse de sortie, et la course du deuxième tronçon 34 par rapport au troisième tronçon 35.But we understand that it is enough to modify the ratio of the sections S6 / S10, for, for example, if the section S6 was equal to half of the section S10 [S6 = (S10) × 0.5Ω, obtain a speed of exit, and one stroke, of the first section 33 relative to the second section 34, equal to twice the exit speed, and the stroke of the second section 34 relative to the third section 35.

Dans la réalisation représentée, la somme des volumes des première petite chambre 6 et deuxième grande chambre 10 a été supposée constante. En réalité, des fuites inévitables provoquent de légères variations de la valeur de cette somme des volumes, et il est souvent nécessaire de compléter la quantité de fluide contenu dans ces chambres, ou, au contraire, de permettre une évacuation de fluide excédentaire. Ce complément ou cette évacuation de fluide sont réalisés automatiquement de la manière suivante.In the embodiment shown, the sum of the volumes of the first small chamber 6 and the second large chamber 10 was assumed to be constant. In reality, inevitable leaks cause slight variations in the value of this sum of volumes, and it is often necessary to supplement the quantity of fluid contained in these chambers, or, on the contrary, to allow an evacuation of excess fluid. This complement or this evacuation of fluid is carried out automatically in the following manner.

Le distributeur à trois positions 24 est supposé avoir été placé dans sa première position.The three-position distributor 24 is assumed to have been placed in its first position.

Si la quantité du fluide contenu dans la deuxième grande chambre 10 devient insuffisante, la pression de ce fluide diminue et devient inférieure à la pression de tarage du manocontact 47, ce qui provoque la liaison électrique entre les deux bornes 48, 49 et, par conséquent, l'alimentation en énergie électrique du dispositif électromagnétique 45, qui place le distributeur de fluide à deux positions 44 dans sa deuxième position. Le fluide sous pression du conduit 28, véhiculé par les conduits 54, 55 et 42, parvient dans la deuxième grande chambre 10 jusqu'à compensation du fluide manquant. Lorsque la pression dans cette chambre redevient supérieure au tarage du manocontact 47, ce manocontact coupe l'alimentation en énergie électrique du dispositif électromagnétique 45: le distributeur de fluide à deux positions 44 est replacé dans sa première position sous l'effet du ressort 46, ce qui provoque l'arrêt de l'arrivée complémentaire de fluide, par le conduit 42, dans la deuxième grande chambre 10.If the amount of fluid in the second large chamber 10 becomes insufficient, the pressure of this fluid decreases and becomes lower than the setting pressure of the pressure switch 47, which causes the electrical connection between the two terminals 48, 49 and, consequently, the supply of electrical energy to the electromagnetic device 45, which places the fluid distributor in two positions 44 in its second position. The pressurized fluid from the conduit 28, conveyed by the conduits 54, 55 and 42, arrives in the second large chamber 10 until compensation for the missing fluid. When the pressure in this chamber again becomes greater than the setting of the pressure switch 47, this pressure switch cuts off the supply of electrical energy to the electromagnetic device 45: the two-position fluid distributor 44 is returned to its first position under the effect of the spring 46, which causes the complementary supply of fluid to stop, via the conduit 42, in the second large chamber 10.

Si, au contraire, la quantité du fluide contenu dans la deuxième grande chambre tend à être excédentaire, la pression de ce fluide augmente jusqu'à atteindre la valeur de la pression de tarage du clapet de décharge 53: au moyen de ce clapet de décharge 53, la pression maximale dans la deuxième grande chambre 10 est limitée à une valeur permettant d'interdire toute détérioration du vérin.If, on the contrary, the quantity of the fluid contained in the second large chamber tends to be in excess, the pressure of this fluid increases until reaching the value of the setting pressure of the relief valve 53: by means of this relief valve 53, the maximum pressure in the second large chamber 10 is limited to a value making it possible to prohibit any deterioration of the jack.

Il doit être observé que la différence des pressions de tarage du manocontact 47 et du clapet de décharge 53 permet d'éviter le fonctionnement permanent dudit clapet de décharge 53, et de limiter la quantité de fluide qui fait retour au réservoir 22 en traversant le clapet de décharge.It should be observed that the difference in the setting pressures of the pressure switch 47 and of the relief valve 53 makes it possible to avoid the permanent operation of said relief valve 53, and to limit the quantity of fluid which returns to the reservoir 22 by passing through the valve. discharge.

La commande proprement dite du télescopage est la suivante:

  • _ pour la sortie des tronçons'les uns par rapport aux autres, et l'extension de la flèche, on place le distributeur 24 dans sa première position: le fluide refoulé par la pompe 23 emplit la première grande chambre 5; le premier piston 4 se rapproche du fond 3 du premier cylindre 1; le fluide contenu dans la première petite chambre 6 est chassé hors de cette chambre et va emplir la deuxième grande chambre 10; le deuxième piston 9 se rapproche du fond 8 du deuxième cylindre 7; et le fluide contenu dans la deuxième petite chambre 11 en est chassé et, par les quatrième 19 et troisième conduits 18, et le conduit 29, retourne au réservoir 22;
  • _ pour la rentrée des divers tronçons et la rétraction de la flèche, la mise en place du distributeur 24 dans sa troisième position provoque les déplacements inverses de ceux décrits en ce qui concerne la sortie de ces tronçons.
The actual telescoping control is as follows:
  • _ for the output of the sections relative to each other, and the extension of the arrow, the distributor 24 is placed in its first position: the fluid discharged by the pump 23 fills the first large chamber 5; the first piston 4 approaches the bottom 3 of the first cylinder 1; the fluid contained in the first small chamber 6 is driven out of this chamber and will fill the second large chamber 10; the second piston 9 is approximates the bottom 8 of the second cylinder 7; and the fluid contained in the second small chamber 11 is expelled therefrom and, through the fourth 19 and third conduits 18, and the conduit 29, returns to the reservoir 22;
  • _ for the return of the various sections and the retraction of the boom, the installation of the distributor 24 in its third position causes the reverse movements of those described with regard to the exit of these sections.

Claims (4)

1. Multi-stage actuator having at least three elements mounted for sliding in relation to one another, comprising:
a first cylinder (1);
a first piston (4) which is mounted for sliding within the first cylinder and defines a first large chamber (5), of large effective section (S5), and a first small chamber (6) of small effective section (S6);
a second cylinder (7), which is fast with the first piston (4) and passes through an end (3) of the first cylinder defining the first small chamber (6);
a second piston (9), which is mounted for sliding within the second cylinder (7) and defines therein a second large chamber (10), of large effective section (S10), and a second small chamber (11) of small effective section (S11);
a piston rod (12) which is fast with the second piston (9) and passes through an end (8) of the second cylinder (7) defining the second small chamber (11);
a first passage (13) which effects permanent communication between the first small chamber (6) and the second large chamber (10), and
two connectors (20, 21) having two external conduits (28, 29) which (conduits) are capable of being connected respectively to a device (23) for supply with fluid under pressure and a pressure fluid outlet (22), and vice versa; while the connectors (20, 21) are disposed on the piston rod (12), the first large chamber (5) is connected to a first one (20) of the two said connectors by a second passage, which is itself constituted by a first conduit (14) which is fast with the first piston (4), passes (15) through this first piston, opens into the first large chamber (5) and is mounted for sealed telescopic sliding in relation to a second conduit (16) which is itself fast with the second piston (9), passes through (17) this second piston, opens into the second large chamber (10) and is disposed within the piston rod (12); the second small chamber (11) is connected to the second (21) of the two said connectors by a third passage, which is itself constituted by a third conduit (18), which is formed in the piston rod (12), is prolonged (19) to the interior of the second piston (9) and opens into the second small chamber (11), and a fifth conduit (42) opens into the second large chamber (10) and is connected to a selective pressure fluid supply supplement device (44, 47);

characterised in that:
a) the fifth conduit is contained in the piston rod;
b) the selective pressure fluid supply supplement device is constituted by a two-position fluid distributor (44), by a connection conduit (54) which connects this two- position fluid distributor (44) to the said connector (20), to which the second conduit (16) is connected, and by a supply supplement conduit (55), which connects the said two- position fluid distributor (44) to the said fifth conduit (42), the first of the two positions of the two-position fluid distributor corresponding to the closure of the supply supplement conduit (55) and the second position corresponding to the placing of the connection conduit (54) in communication with the supply supplement conduit (55);
c) the two-position fluid distributor (44) comprises an electromagnetic device (45) for regulating its position which is connected (58) to one (48) of the electric terminals (48, 49) of a pressure contact (47) which is itself connected (57) to the said supply supplement conduit (55).
2. Multi-stage actuator according to Claim 1, characterised in that it comprises a calibrated discharge valve (53) connected in parallel (56, 55) to the said fifth conduit (42).
3. Telescopic jib comprising a first, internal section (33), a second, intermediate section (34), within which the first section (33) is mounted for sliding, and a third, external section (35) within which the second section (34) is mounted for sliding, characterised in that an actuator according to any one of Claims 1 and 2 is there mounted longitudinally (32) within the said three sections, the first cylinder (1) being fast (3a) with the first section (33), the second cylinder (7) being fast (8a) with the second section (34) and the piston rod (12) being fast (41- 40) with the third section (35).
4. Jib according to Claim 3, characterised in that the first cylinder (1) is fixed (3a) on the internal extremity of the first section (33), the second cylinder (7) is fixed (8a) on the internal extremity of the second section (34) and the piston rod (12) is fixed (41) on the part (40) of the third section (35) which is opposite to the axial opening (35a) of this third section through which the second section (34) penetrates.
EP19880401457 1987-06-15 1988-06-14 Multi-stage actuator with at least three sliding elements and telescopic jib incorporating this actuator Expired - Lifetime EP0296047B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8708297A FR2616489A1 (en) 1987-06-15 1987-06-15 MULTIPLE CYLINDER WITH AT LEAST THREE SLIDING ELEMENTS AND TELESCOPIC ARROW BY APPLYING
FR8708297 1987-06-15

Publications (2)

Publication Number Publication Date
EP0296047A1 EP0296047A1 (en) 1988-12-21
EP0296047B1 true EP0296047B1 (en) 1991-04-03

Family

ID=9352031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880401457 Expired - Lifetime EP0296047B1 (en) 1987-06-15 1988-06-14 Multi-stage actuator with at least three sliding elements and telescopic jib incorporating this actuator

Country Status (3)

Country Link
EP (1) EP0296047B1 (en)
DE (1) DE3862246D1 (en)
FR (1) FR2616489A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900150A (en) * 2010-08-31 2010-12-01 三一汽车起重机械有限公司 Multi-stage oil cylinder and hydraulic device with same

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659398B1 (en) * 1990-03-06 1992-07-10 Ppm Sa MULTIPLE JACK, CIRCUIT FOR SUPPLYING SUCH A JACK, AND TELESCOPIC BOOM USING THE JACK.
IT1259864B (en) * 1992-01-14 1996-03-28 Sergio Cella CYLINDER WITH TWO OR MORE SIMULTANEOUS SLIDES
US5435228A (en) * 1993-07-20 1995-07-25 Pneumatic Energy Inc Pneumatic transformer
US5850713A (en) * 1996-12-20 1998-12-22 Yuasa Koki Co., Ltd Device raising and lowering apparatus
US6116140A (en) * 1998-04-06 2000-09-12 Grove U.S. L.L.C. Telescoping system with multi-stage telescopic cylinder
CN102678662A (en) * 2012-05-14 2012-09-19 长沙金阳机械设备科技开发有限公司 Fast-slow speed stoke integrated energy-saving oil cylinder and application device thereof
CN103452949A (en) * 2013-09-16 2013-12-18 大连宏远气动液压船舶辅机有限公司 Energy-saving double-speed hydraulic compression composite oil cylinder
FR3013744A1 (en) * 2013-11-26 2015-05-29 Greffet Sas A HYDRAULIC TAPPING SYSTEM CHARACTERIZED BY A 2000-MM LINEAR TELESCOPIC ARM ADJUSTABLE IN ROTATION AT MORE OR LESS 45 ° OF THE ROAD
ITUB20160363A1 (en) * 2016-01-29 2017-07-29 Manitou Italia Srl Telescopic arm for self-propelled operating machines.
CN105782160A (en) * 2016-05-11 2016-07-20 中国工程物理研究院总体工程研究所 Single-rod inlet and outlet bi-direction equal-load hydraulic cylinder
CN110296262A (en) * 2019-06-27 2019-10-01 佛山市恒力泰机械有限公司 A kind of multiple drive power cylinder and a kind of inserted valve of multiple drive power

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3603207A (en) * 1969-05-26 1971-09-07 Koehring Co Multiple-cylinder telescopic actuator
US3624979A (en) * 1969-08-25 1971-12-07 Daniel F Przybylski Telescoping hydraulic cylinder arrangement for multiple section extensible booms
FR2345608A1 (en) * 1976-03-23 1977-10-21 Pagliero Pietro Hydraulic ram with coaxial cylinders - has central telescopic flow tubes and apertures through cylinders

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900150A (en) * 2010-08-31 2010-12-01 三一汽车起重机械有限公司 Multi-stage oil cylinder and hydraulic device with same
CN101900150B (en) * 2010-08-31 2013-11-20 三一汽车起重机械有限公司 Multi-stage oil cylinder and hydraulic device with same

Also Published As

Publication number Publication date
FR2616489A1 (en) 1988-12-16
EP0296047A1 (en) 1988-12-21
DE3862246D1 (en) 1991-05-08

Similar Documents

Publication Publication Date Title
EP0296047B1 (en) Multi-stage actuator with at least three sliding elements and telescopic jib incorporating this actuator
EP0446115B1 (en) Multiple actuator, supply circuit for such an actuator and telescopic boom as an application of this actuator
FR2666787A1 (en) HYDRAULIC ACTUATOR WITH HYDROSTATIC MODE OF PREFERRED EMERGENCY OPERATION, AND FLIGHT CONTROL SYSTEM COMPRISING SAME.
FR2548291A1 (en) HYDRAULIC INSTALLATION COMPRISING TWO EQUIPMENT USING HYDRAULIC ENERGY
FR2458840A1 (en) ELECTRONIC ASSEMBLY FOR CONTROLLING VARIABLE FLOW PUMPS
FR2662215A1 (en) COMPRESSION DEVICE, PARTICULARLY FOR PRESSURE FILLING OF A TANK.
FR2503214A2 (en) FEEDER-TYPE TERRACEMENT ENGINE
BE898332A (en) Method for saving energy when adjusting a cylinder of hydraulic excavator equipment by means of a hydraulic assembly.
FR2683867A1 (en) HYDRAULIC CIRCUIT FOR THE SYNCHRONOUS OPERATION OF TWO DOUBLE ACTING JACKS, ESPECIALLY FOR A BACKHOE LOADER.
FR2571102A1 (en) CONTROL DEVICE FOR A HYDRAULIC USER APPARATUS
FR2767932A1 (en) Fuel injection regulator for internal combustion engine
FR2595416A1 (en) RADIAL PISTON PUMP
FR2620660A1 (en) LEVEL REGULATOR FOR MOTOR VEHICLE
EP0063523A1 (en) Injection pump for an internal-combustion engine comprising a mechanism for controlling the start of the fuel injection delivery
EP0176381B1 (en) High-pressure hydraulic directional control valve with a pilot pressure generator
EP0130879B1 (en) Device for the automatic reversal of the feed to a double acting ram by a simple or double acting control
FR2640799A1 (en) MECHANISM FOR OBTAINING A TRANSLATION MOVEMENT IN A MARINE AND SONAR ENVIRONMENT EQUIPPED WITH SUCH A MECHANISM
FR2527668A1 (en) ARROW EARTH MACHINE, BALANCIER AND BUCKET COMPRISING A DEVICE FOR CONTROLLING THE ORIENTATION OF THE BUCKET
FR2548242A2 (en) Earth working machine, particularly such as a hydraulic shovel
FR2479169A1 (en) HYDRAULIC CIRCUIT FOR FORKLIFT FORKLIFT
WO2014009543A1 (en) Device for controlling the movement of a hydraulic cylinder, particularly for hydraulic machines
EP2551571A1 (en) Electrovalve system adapted for an hydraulic circuit
FR2473643A1 (en) Immersible pump with direct driven top piston - has piston action transmitted through water column and return spring
WO1995008715A1 (en) Hydraulic control device for a double acting cylinder
BE1008039A6 (en) Hydraulic slide solenoid.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19890220

17Q First examination report despatched

Effective date: 19900209

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: DR. ING. A. RACHELI & C.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT NL

REF Corresponds to:

Ref document number: 3862246

Country of ref document: DE

Date of ref document: 19910508

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: FR

Ref legal event code: GC

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20030520

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030606

Year of fee payment: 16

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040614

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050101

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040614

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20050101

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070711

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070616

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070621

Year of fee payment: 20