EP1299213B1 - Percussion hydraulic apparatus - Google Patents

Percussion hydraulic apparatus Download PDF

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Publication number
EP1299213B1
EP1299213B1 EP01954069A EP01954069A EP1299213B1 EP 1299213 B1 EP1299213 B1 EP 1299213B1 EP 01954069 A EP01954069 A EP 01954069A EP 01954069 A EP01954069 A EP 01954069A EP 1299213 B1 EP1299213 B1 EP 1299213B1
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EP
European Patent Office
Prior art keywords
piston
distribution box
distributor
chamber
channel
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Expired - Lifetime
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EP01954069A
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German (de)
French (fr)
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EP1299213A1 (en
Inventor
Bernard Piras
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Montabert SAS
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Montabert SAS
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/16—Valve arrangements therefor
    • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve

Definitions

  • the present invention relates to a hydraulic percussion apparatus.
  • a percussion apparatus comprises a body containing a cylinder, inside which is slidably mounted a striking piston of a tool, hydraulically driven alternately by an incompressible fluid.
  • the movement of the piston is controlled by a distributor which opens and closes hydraulic circuits putting some chambers located on either side of the piston successively in communication with a high pressure circuit and a low pressure circuit to create this sequential alternating movement.
  • the document US 4,230,019 relates to a percussion apparatus comprising a plurality of bodies, respectively a main body including the striking piston, a body containing the dispensing system and a body containing an energy accumulator.
  • the arrangement of these different bodies is such that the power circuits for passing the flow rates of fluid necessary for the activation of the striking movement, and the control circuits of smaller dimensions, which ensure the movement of the distributor, are arranged both in the body containing the cylinder and in the body containing the dispenser.
  • control channels are formed both in the body containing the cylinder and in the body containing the distributor, which requires the realization of a seal between these two bodies.
  • the dispensing body is positioned laterally, so that it must be securely held due to the accelerations it undergoes resulting shock waves.
  • the document FR 2 045 289 describes an apparatus according to the preamble of claim 1.
  • the object of the invention is to provide a hydraulic percussion device, the control system of the dispenser is made in a simple manner, and with a small footprint.
  • the connecting ducts of the control chamber, with the high pressure and low pressure circuits, are formed in the distribution box.
  • This hydraulic percussion device has a compact structure, since there is an overlap of the distribution box and the cylinder containing the piston.
  • the structure of this apparatus is simplified, insofar as the control and control circuits of the distribution assembly are independent of the cylinder body and are formed in the distribution box. Thus, only the power circuits necessary for the movement of the striking piston are machined in the cylinder body. It may be noted that the same distribution system can equip different types of percussion apparatus.
  • the upper end of the piston has a central and axial bore in which is engaged a central axial cylindrical bearing belonging to the distribution box, the bore of the piston having a recess. annular delimiting with the cylindrical scope of the distribution box, the control chamber.
  • the upper end of the piston comprises a central and axial cylindrical bearing which is engaged in a central and axial bore formed in the distribution box, the cylindrical bearing surface of the piston comprising an annular groove delimiting with the central bore of the distribution box, the pilot chamber.
  • the apparatus comprises a lower chamber formed between the lower end of the distribution box and the piston, permanently connected to the low pressure network by a channel, and a channel which, opening radially in the boring ensuring the sliding of the piston relative to the distribution box, above the communication channel of the control chamber and the control chamber of the distributor, is permanently connected to the high pressure network, the movement of the piston relative to the distribution box successively putting the control chamber into communication with the lower chamber connected to the high pressure network and the channel connected to the low pressure network.
  • the supply channel of the lower chamber, as well as the channel connected to the low pressure network, are formed in the distribution box.
  • the frequency of the device can be chosen according to the choice of surfaces of the different sections. This choice determines, for a strike piston stroke, the cubic capacity of the apparatus and consequently its striking frequency for a given feed rate.
  • the reciprocating movement of the piston is obtained by communicating the driving chamber 6 alternately with the high-pressure network 9 and the low-pressure network 12, so that the resultant of the hydraulic forces applied to the piston 1 is exerted successively in one direction and in one direction. the other.
  • the bore of the piston comprises a recess or annular groove delimiting with the cylindrical bearing surface of the distribution box an annular pilot chamber 13.
  • a control chamber 14 of the movement of the distributor 15 via a channel 16 and the control chamber 13 either with the high-pressure network 9 or with the low-pressure network 12.
  • the cylindrical bearing surface of the distribution box 3 comprises a channel 17 for placing the lower chamber 10 in communication with the low pressure network 12, as well as a channel 18 opening radially into the bore 4, above of the control chamber 13, connected to the high pressure network 9.
  • the distributor 15 is driven by a downward movement when the control chamber 14 is connected to the low pressure circuit 12 and a rising movement when the latter communicates with the high pressure circuit 9.
  • the reciprocating movement of the distributor 15 is obtained by communicating the control chamber 14 alternately with the high pressure circuit 9 and the low pressure circuit 12, so that, depending on the surfaces chosen for the sections of the three chambers 14, 19, 22, the resultant force applied to the distributor is exerted successively in one direction and the other.
  • the initial state is that shown in Figure 1, wherein the distributor 15 is in the low position and the piston 1 is in the low position.
  • the control chamber 14 being connected to the low pressure circuit via the channel 16, the pilot chamber 13, lower chamber 10 and channel 17.
  • FIG. 5 represents an alternative embodiment of this apparatus, in which the same elements are designated by the same references as before.
  • the overlap of the distribution box 3 and the striking piston 1 results from the fact that the striking piston comprises a central cylindrical surface 34 which is engaged in a central bore 35 formed in the distribution box 3.
  • the range cylindrical 34 has an annular groove delimiting the control chamber 36.
  • the lower chamber 10 is then no longer a central chamber but an annular chamber.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Fish Paste Products (AREA)

Abstract

The invention concerns an apparatus comprising a body ( 1 ) containing a cylinder wherein is mounted sliding an impact piston ( 1 ) of a tool, the motion of the piston being controlled by a distributor ( 15 ) which, arranged coaxial to the impact piston, is mounted inside a distribution box ( 3 ). The distribution box ( 3 ) comprises a part axially overlapping the piston ( 1 ) and arranged concentric thereto, and the distribution box ( 3 ) defines with the piston a control chamber ( 13 ) which, successively put under the high ( 9 ) and the low ( 12 ) pressure of the fluid, communicates through a passage ( 16 ) arranged in the distribution box ( 3 ) with a chamber controlling ( 14 ) the movement of the distributor ( 15 ), to generate alternately low pressure and high pressure.

Description

La présente invention a pour objet un appareil hydraulique à percussions.The present invention relates to a hydraulic percussion apparatus.

Un appareil à percussions comprend un corps contenant un cylindre, à l'intérieur duquel est monté coulissant un piston de frappe d'un outil, entraîné hydrauliquement de façon alternative par un fluide incompressible. Le mouvement du piston est commandé par un distributeur qui ouvre et ferme des circuits hydrauliques mettant certaines chambres situées de part et d'autre du piston successivement en communication avec un circuit haute pression et un circuit basse pression pour créer ce mouvement alternatif séquencé.A percussion apparatus comprises a body containing a cylinder, inside which is slidably mounted a striking piston of a tool, hydraulically driven alternately by an incompressible fluid. The movement of the piston is controlled by a distributor which opens and closes hydraulic circuits putting some chambers located on either side of the piston successively in communication with a high pressure circuit and a low pressure circuit to create this sequential alternating movement.

Le document US 4 230 019 concerne un appareil à percussions comprenant plusieurs corps, respectivement un corps principal incluant le piston de frappe, un corps contenant le système de distribution et un corps contenant un accumulateur d'énergie. L'agencement de ces différents corps est tel que les circuits de puissance permettant de faire transiter les débits de fluide nécessaires à l'activation du mouvement de frappe, et les circuits de commande plus faiblement dimensionnés, qui assurent le mouvement du distributeur, sont ménagés à la fois dans le corps contenant le cylindre et dans le corps contenant le distributeur.The document US 4,230,019 relates to a percussion apparatus comprising a plurality of bodies, respectively a main body including the striking piston, a body containing the dispensing system and a body containing an energy accumulator. The arrangement of these different bodies is such that the power circuits for passing the flow rates of fluid necessary for the activation of the striking movement, and the control circuits of smaller dimensions, which ensure the movement of the distributor, are arranged both in the body containing the cylinder and in the body containing the dispenser.

Il en résulte un certain nombre d'inconvénients.This results in a number of disadvantages.

C'est ainsi notamment que les canaux de commande sont ménagés à la fois dans le corps contenant le cylindre et dans le corps contenant le distributeur, ce qui nécessite la réalisation d'une étanchéité entre ces deux corps.Thus, in particular, the control channels are formed both in the body containing the cylinder and in the body containing the distributor, which requires the realization of a seal between these two bodies.

Le corps de distribution est positionné latéralement, de telle sorte qu'il doit être solidement maintenu en raison des accélérations qu'il subit résultant des ondes de choc.The dispensing body is positioned laterally, so that it must be securely held due to the accelerations it undergoes resulting shock waves.

Il est connu également de positionner un bloc de distribution au-dessus du corps contenant le cylindre, ce qui nécessite le forage de trous longs dans le corps contenant le cylindre pour connecter les différents circuits, ce qui se traduit par une augmentation du coût de réalisation et une augmentation des pertes de charge en ligne.It is also known to position a distribution block above the body containing the cylinder, which requires the drilling of long holes in the body containing the cylinder to connect the different circuits, which results in an increase in the cost of production. and an increase in pressure drops online.

Le document FR 2 045 289 décrit un appareil selon le préambule de la revendication 1.The document FR 2 045 289 describes an apparatus according to the preamble of claim 1.

Le but de l'invention est de fournir un appareil hydraulique à percussions, dont le système de commande du distributeur soit réalisé de façon simple, et avec un encombrement réduit.The object of the invention is to provide a hydraulic percussion device, the control system of the dispenser is made in a simple manner, and with a small footprint.

A cet effet, l'appareil hydraulique à percussions qu'elle concerne, comprenant un corps contenant un cylindre à l'intérieur duquel est monté coulissant un piston de frappe d'un outil, entraîné hydrauliquement de façon alternative par un fluide incompressible, le mouvement du piston étant commandé par un distributeur qui, disposé coaxialement au piston de frappe, est monté à l'intérieur d'une boîte de distribution, est caractérisé en ce que :

  • la boîte de distribution comprend une partie interférant axialement avec le piston et disposée concentriquement à celui-ci, et
  • la boîte de distribution délimite avec le piston une chambre de pilotage qui, mise successivement à la haute et à la basse pression du fluide, est en communication par un canal ménagé dans la boîte de distribution avec une chambre de commande du mouvement du distributeur, pour créer dans celle-ci alternativement une basse pression et une haute pression et, par suite, une inversion séquencée de la résultante des forces appliquées sur le distributeur.
For this purpose, the hydraulic percussion apparatus it concerns, comprising a body containing a cylinder inside which is slidably mounted a striking piston of a tool, hydraulically driven alternately by an incompressible fluid, the movement piston being controlled by a distributor which, arranged coaxially with the striking piston, is mounted inside a distribution box, is characterized in that:
  • the distribution box comprises a part interfering axially with the piston and concentrically disposed thereon, and
  • the distribution box delimits with the piston a pilot chamber which, successively placed at the high and low pressure of the fluid, is in communication via a channel formed in the distribution box with a control chamber for the movement of the distributor, for alternatively creating a low pressure and a high pressure therein and, consequently, a sequential inversion of the resultant of the forces applied to the distributor.

Avantageusement, les canaux de liaison de la chambre de pilotage, avec les circuits haute pression et basse pression, sont ménagés dans la boîte de distribution.Advantageously, the connecting ducts of the control chamber, with the high pressure and low pressure circuits, are formed in the distribution box.

Cet appareil hydraulique à percussions est d'une structure compacte, puisqu'existe un chevauchement de la boîte de distribution et du cylindre contenant le piston. En outre, la structure de cet appareil est simplifiée, dans la mesure où les circuits de commande et de pilotage de l'ensemble de distribution sont indépendants du corps du cylindre et sont ménagés dans la boîte de distribution. Ainsi, ne sont usinés dans le corps du cylindre que les circuits de puissance nécessaires au mouvement du piston de frappe. Il peut être noté qu'un même système de distribution peut équiper différents types d'appareils à percussions.This hydraulic percussion device has a compact structure, since there is an overlap of the distribution box and the cylinder containing the piston. In addition, the structure of this apparatus is simplified, insofar as the control and control circuits of the distribution assembly are independent of the cylinder body and are formed in the distribution box. Thus, only the power circuits necessary for the movement of the striking piston are machined in the cylinder body. It may be noted that the same distribution system can equip different types of percussion apparatus.

Suivant une première forme d'exécution de cet appareil, l'extrémité supérieure du piston présente un alésage central et axial dans lequel est engagée une portée cylindrique centrale et axiale appartenant à la boîte de distribution, l'alésage du piston comportant un évidement annulaire délimitant avec la portée cylindrique de la boîte de distribution, la chambre de pilotage.According to a first embodiment of this apparatus, the upper end of the piston has a central and axial bore in which is engaged a central axial cylindrical bearing belonging to the distribution box, the bore of the piston having a recess. annular delimiting with the cylindrical scope of the distribution box, the control chamber.

Suivant une seconde forme d'exécution de cet appareil, l'extrémité supérieure du piston comporte une portée cylindrique centrale et axiale qui est engagée dans un alésage central et axial ménagé dans la boîte de distribution, la portée cylindrique du piston comportant une gorge annulaire délimitant avec l'alésage central de la boîte de distribution, la chambre de pilotage.According to a second embodiment of this apparatus, the upper end of the piston comprises a central and axial cylindrical bearing which is engaged in a central and axial bore formed in the distribution box, the cylindrical bearing surface of the piston comprising an annular groove delimiting with the central bore of the distribution box, the pilot chamber.

Dans les deux formes d'exécution, l'appareil comporte une chambre inférieure ménagée entre l'extrémité inférieure de la boîte de distribution et le piston, reliée en permanence au réseau basse pression par un canal, et un canal qui, débouchant radialement dans l'alésage assurant le coulissement du piston par rapport à la boîte de distribution, au-dessus du canal de mise en communication de la chambre de pilotage et de la chambre de commande du distributeur, est relié en permanence au réseau haute pression, le mouvement du piston par rapport à la boîte de distribution mettant successivement la chambre de pilotage en communication avec la chambre inférieure reliée au réseau haute pression et le canal relié au réseau basse pression. Le canal d'alimentation de la chambre inférieure, de même que le canal relié au réseau basse pression, sont ménagés dans la boîte de distribution.In both embodiments, the apparatus comprises a lower chamber formed between the lower end of the distribution box and the piston, permanently connected to the low pressure network by a channel, and a channel which, opening radially in the boring ensuring the sliding of the piston relative to the distribution box, above the communication channel of the control chamber and the control chamber of the distributor, is permanently connected to the high pressure network, the movement of the piston relative to the distribution box successively putting the control chamber into communication with the lower chamber connected to the high pressure network and the channel connected to the low pressure network. The supply channel of the lower chamber, as well as the channel connected to the low pressure network, are formed in the distribution box.

De toute façon, l'invention sera bien comprise, à l'aide de la description qui suit, en référence au dessin schématique annexé représentant, à titre d'exemples non limitatifs, deux formes d'exécution de cet appareil :

  • Figures 1 à 4 sont quatre vues en coupe longitudinale de cet appareil au cours de quatre phases de fonctionnement ;
  • Figure 5 est une vue en coupe longitudinale d'une seconde forme d'exécution.
In any case, the invention will be better understood, with the aid of the description which follows, with reference to the appended schematic drawing showing, by way of non-limiting examples, two embodiments of this apparatus:
  • Figures 1 to 4 are four views in longitudinal section of this apparatus during four phases of operation;
  • Figure 5 is a longitudinal sectional view of a second embodiment.

L'appareil représenté aux figures 1 à 4 comprend un piston 1 monté coulissant à l'intérieur d'un cylindre ménagé dans un corps 2. Au cours de son mouvement alternatif, le piston est destiné à venir frapper contre l'extrémité supérieure d'un outil O. Le corps 2 contient, au-dessus du piston 1, une boîte de distribution 3. Le piston 1 comporte un alésage central et axial 4 à l'intérieur duquel est engagée une portée cylindrique 5 appartenant à la boîte de distribution 3. Le piston délimite avec son cylindre et avec la boîte de distribution 3 au moins trois chambres :

  • une chambre motrice annulaire 6 située au-dessus du piston,
  • une chambre annulaire antagoniste 7 dont la surface de la section est faible et qui est toujours en communication avec le circuit 9 d'alimentation en haute pression, et
  • une chambre centrale ou chambre inférieure 10 reliée en permanence au circuit basse pression 12.
The apparatus shown in FIGS. 1 to 4 comprises a piston 1 slidably mounted inside a cylinder formed in a body 2. During its reciprocating movement, the piston is intended to strike against the upper end of the cylinder. a tool O. The body 2 contains, above the piston 1, a distribution box 3. The piston 1 comprises a central and axial bore 4 inside which is engaged a cylindrical surface 5 belonging to the distribution box 3. The piston delimits with its cylinder and with the distribution box 3 at least three chambers:
  • an annular drive chamber 6 located above the piston,
  • an annular annular chamber 7 whose surface of the section is small and which is still in communication with the high-pressure supply circuit 9, and
  • a central chamber or lower chamber 10 permanently connected to the low pressure circuit 12.

Pour un débit constant de fluide sous pression, la fréquence de l'appareil pourra être choisie en fonction du choix des surfaces des différentes sections. Ce choix détermine, pour une course de piston de frappe, la cylindrée de l'appareil et par conséquent sa fréquence de frappe pour un débit donné d'alimentation.For a constant flow of fluid under pressure, the frequency of the device can be chosen according to the choice of surfaces of the different sections. This choice determines, for a strike piston stroke, the cubic capacity of the apparatus and consequently its striking frequency for a given feed rate.

Le mouvement alternatif du piston est obtenu par communication de la chambre motrice 6 alternativement avec le réseau haute pression 9 et le réseau basse pression 12, de telle sorte que la résultante des forces hydrauliques appliquées au piston 1 s'exerce successivement dans un sens et dans l'autre.The reciprocating movement of the piston is obtained by communicating the driving chamber 6 alternately with the high-pressure network 9 and the low-pressure network 12, so that the resultant of the hydraulic forces applied to the piston 1 is exerted successively in one direction and in one direction. the other.

L'alésage du piston comporte un évidement ou gorge annulaire délimitant avec la portée cylindrique de la boîte de distribution une chambre annulaire de pilotage 13. En fonction de la position du piston par rapport à la portée cylindrique 5 de la boîte de distribution, il est possible d'établir une communication d'une chambre de commande 14 du mouvement du distributeur 15 par l'intermédiaire d'un canal 16 et de la chambre de pilotage 13 soit avec le réseau haute pression 9, soit avec le réseau basse pression 12.The bore of the piston comprises a recess or annular groove delimiting with the cylindrical bearing surface of the distribution box an annular pilot chamber 13. Depending on the position of the piston relative to the cylindrical bearing surface 5 of the distribution box, it is it is possible to establish a communication of a control chamber 14 of the movement of the distributor 15 via a channel 16 and the control chamber 13 either with the high-pressure network 9 or with the low-pressure network 12.

A cet effet, la portée cylindrique de la boîte de distribution 3 comprend un canal 17 de mise en communication de la chambre inférieure 10 avec le réseau basse pression 12, ainsi qu'un canal 18 débouchant radialement dans l'alésage 4, au-dessus de la chambre de pilotage 13, relié au réseau haute pression 9.For this purpose, the cylindrical bearing surface of the distribution box 3 comprises a channel 17 for placing the lower chamber 10 in communication with the low pressure network 12, as well as a channel 18 opening radially into the bore 4, above of the control chamber 13, connected to the high pressure network 9.

Le distributeur 15 délimite trois chambres avec la boîte de distribution 12 et le couvercle 19 :

  • une chambre centrale 20 en communication permanente avec le réseau haute pression d'alimentation 9,
  • une chambre annulaire 22 toujours en communication avec le circuit basse pression 12, et
  • la chambre annulaire 14, antagoniste à la chambre 22 et reliée par le canal 16 à la chambre de pilotage 13.
The distributor 15 delimits three chambers with the distribution box 12 and the cover 19:
  • a central chamber 20 in permanent communication with the high-pressure supply network 9,
  • an annular chamber 22 still in communication with the low pressure circuit 12, and
  • the annular chamber 14, antagonizing the chamber 22 and connected by the channel 16 to the control chamber 13.

Pour la suite de la description, il est admis, à titre d'exemple, que le distributeur 15 est animé d'un mouvement de descente lorsque la chambre de commande 14 est reliée au circuit basse pression 12 et d'un mouvement de montée lorsque cette dernière communique avec le circuit haute pression 9.For the rest of the description, it is accepted, by way of example, that the distributor 15 is driven by a downward movement when the control chamber 14 is connected to the low pressure circuit 12 and a rising movement when the latter communicates with the high pressure circuit 9.

Le mouvement alternatif du distributeur 15 est obtenu par communication de la chambre de commande 14 alternativement avec le circuit haute pression 9 et le circuit basse pression 12, de telle sorte que, en fonction des surfaces choisies pour les sections des trois chambres 14, 19, 22, la force résultante appliquée au distributeur s'exerce successivement dans un sens et dans l'autre.The reciprocating movement of the distributor 15 is obtained by communicating the control chamber 14 alternately with the high pressure circuit 9 and the low pressure circuit 12, so that, depending on the surfaces chosen for the sections of the three chambers 14, 19, 22, the resultant force applied to the distributor is exerted successively in one direction and the other.

L'état initial est celui représenté à la figure 1, dans laquelle le distributeur 15 est en position basse et le piston 1 est en position basse. Dès que le fluide sous pression circule dans le canal haute pression 9, la résultante des forces appliquées au distributeur maintient celui-ci en position basse, la chambre de commande 14 étant reliée au circuit basse pression par l'intermédiaire du canal 16, de la chambre de pilotage 13, de la chambre inférieure 10 et du canal 17. La résultante des forces appliquées au piston de frappe fait remonter ce dernier, puisque la chambre motrice 6 est reliée au circuit basse pression par l'intermédiaire d'un canal 23 et de la gorge annulaire 22.The initial state is that shown in Figure 1, wherein the distributor 15 is in the low position and the piston 1 is in the low position. As soon as the pressurized fluid circulates in the high pressure channel 9, the resultant of the forces applied to the distributor keeps it in the low position, the control chamber 14 being connected to the low pressure circuit via the channel 16, the pilot chamber 13, lower chamber 10 and channel 17. The resultant forces applied to the striking piston up the latter, since the driving chamber 6 is connected to the low pressure circuit via a channel 23 and of the annular groove 22.

Au cours du mouvement de montée du piston de frappe, il se produit les opérations suivantes :

  • L'arête 24 de l'évidement annulaire formant chambre de pilotage 13 croise l'arête 25 de la portée cylindrique de la boîte de distribution 3, isolant ainsi le canal de commande 16 du circuit basse pression.
  • En fin de remontée du piston de frappe 1, comme montré à la figure 2, l'arête 26 du piston découvre l'ouverture du canal 18 relié à la haute pression, établissant ainsi une communication du circuit haute pression vers le canal de commande 16 et la chambre de commande 14 par l'intermédiaire de la chambre de pilotage 13.
  • La chambre de commande 14 du distributeur 15 est alors à la haute pression, de telle sorte que la résultante des forces appliquées au distributeur fait monter ce dernier, comme montré à la figure 3.
  • L'arête 27 du distributeur 13 découvre l'arête 28 de la boîte de distribution 3 et établit une communication entre le fluide haute pression provenant du circuit 9 et de la chambre centrale 20 avec le canal 23 et la chambre motrice 6.
  • Le distributeur 15 terminant sa course de montée, la résultante des forces appliquées au piston 1 accélère celui-ci vers le bas pour sa course de frappe, comme montré à la figure 4.
  • Le circuit de commande 14, 16 du distributeur est isolé de la haute pression et mis en communication avec le circuit basse pression, par l'intermédiaire de la chambre de pilotage 13 et de la chambre inférieure 10. La résultante des forces appliquée au distributeur est alors dirigée vers le bas et le distributeur commence son mouvement de descente. Simultanément, le piston de frappe 1 atteint sa zone d'impact.
  • L'arête 27 du distributeur 15 croise l'arête 28 de la boîte de distribution 3, isolant ainsi la chambre motrice 6 du piston de frappe.
  • Le distributeur établit une communication entre le circuit basse pression 12 et la chambre motrice 6. Le piston de frappe et le distributeur sont alors en position basse, représentés à la figure 1, et le cycle de travail peut recommencer.
During the upward movement of the striking piston, the following operations occur:
  • The edge 24 of the annular recess forming the pilot chamber 13 crosses the edge 25 of the cylindrical surface of the distribution box 3, thus isolating the control channel 16 of the low pressure circuit.
  • At the end of raising of the striking piston 1, as shown in FIG. 2, the edge 26 of the piston discovers the opening of the channel 18 connected to the high pressure, thus establishing a communication of the high pressure circuit towards the control channel 16 and the control chamber 14 via the control chamber 13.
  • The control chamber 14 of the distributor 15 is then at high pressure, so that the resultant of the forces applied to the distributor causes the latter to rise, as shown in FIG.
  • The edge 27 of the distributor 13 discovers the edge 28 of the distribution box 3 and establishes a communication between the high pressure fluid coming from the circuit 9 and the central chamber 20 with the channel 23 and the driving chamber 6.
  • As the distributor 15 finishes its upstroke, the resultant of the forces applied to the piston 1 accelerates it downwards for its striking stroke, as shown in FIG. 4.
  • The control circuit 14, 16 of the distributor is isolated from the high pressure and placed in communication with the low pressure circuit, via the control chamber 13 and the lower chamber 10. The resultant of the forces applied to the distributor is then directed down and the dispenser begins its descent movement. Simultaneously, the striking piston 1 reaches its impact zone.
  • The edge 27 of the distributor 15 crosses the edge 28 of the distribution box 3, thus isolating the driving chamber 6 of the striking piston.
  • The distributor establishes a communication between the low pressure circuit 12 and the driving chamber 6. The striking piston and the distributor are then in the low position, shown in Figure 1, and the work cycle can start again.

La figure 5 représente une variante d'exécution de cet appareil, dans laquelle les mêmes éléments sont désignés par les mêmes références que précédemment. Dans ce cas, le chevauchement de la boîte de distribution 3 et du piston de frappe 1 résulte du fait que le piston de frappe comporte une portée cylindrique centrale 34 qui est engagé dans un alésage central 35 ménagé dans la boîte de distribution 3. La portée cylindrique 34 comporte une gorge annulaire délimitant la chambre de pilotage 36. La chambre inférieure 10 n'est alors plus une chambre centrale mais une chambre annulaire.FIG. 5 represents an alternative embodiment of this apparatus, in which the same elements are designated by the same references as before. In this case, the overlap of the distribution box 3 and the striking piston 1 results from the fact that the striking piston comprises a central cylindrical surface 34 which is engaged in a central bore 35 formed in the distribution box 3. The range cylindrical 34 has an annular groove delimiting the control chamber 36. The lower chamber 10 is then no longer a central chamber but an annular chamber.

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cet appareil à percussion, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes.It goes without saying that the invention is not limited to the embodiments of this percussion device, described above as examples, it encompasses all variants.

Claims (5)

  1. A percussive hydraulic apparatus comprising a body (2) containing a cylinder, inside which there is slidingly mounted a percussion piston (1) acting on a tool, driven hydraulically in reciprocating manner by an incompressible fluid, the movement of the piston being controlled by a distributor (15) disposed coaxially relative to the percussion piston, characterised in that:
    - the distributor (15) is mounted inside a distribution box (3),
    - the distribution box (3) comprises a part interfering axially with the piston (1) and disposed concentrically thereto, and
    - the distribution box (3) defines with the piston a guide chamber (13) which, when placed successively under the high (9) and low pressure (12) of the fluid, is in communication via a channel (16) formed in the distribution box (3) with a control chamber (14) controlling the movement of the distributor (15), so as to create therein alternately a low pressure and a high pressure and, consequently, sequenced inversion of the resultant of the forces applied to the distributor (15).
  2. A percussive hydraulic apparatus according to claim 1, characterised in that the channels (17, 18) connecting the guide chamber (13) to the high and low pressure circuits are formed in the distribution box (3).
  3. A percussive hydraulic apparatus according to one of claims 1 and 2, characterised in that the upper end of the piston (1) has a central, axial bore (4), in which there is engaged a central, axial cylindrical bearing surface (5) belonging to the distribution box (3), the bore (4) of the piston comprising an annular recess (13) defining, with the cylindrical bearing surface (5) of the distribution box (3), the guide chamber.
  4. A percussive hydraulic apparatus according to one of claims 1 and 2, characterised in that the upper end of the piston (1) comprises a central, axial cylindrical bearing surface (34) which is engaged in a central, axial bore (35) formed in the distribution box (3), the cylindrical bearing surface (35) of the piston (1) comprising an annular groove (36) defining, with the central bore (35) of the distribution box (3), the guide chamber.
  5. A percussive hydraulic apparatus according to one of claims 1 to 4, characterised in that it comprises a lower chamber (10) formed between the lower end of the distribution box (3) and the piston (1), connected permanently to the low pressure network by a channel (17), and a channel (18) which, opening radially into the bore (4) ensuring sliding of the piston (1) relative to the distribution box (3), above the channel (16) which brings the guide chamber (10) into communication with the control chamber (14) controlling the distributor, is connected permanently to the high pressure network, movement of the piston (1) relative to the distribution box (3) successively bringing the guide chamber (10) into communication with the lower chamber (10) connected to the high pressure network and the channel (18) connected to the low pressure network.
EP01954069A 2000-07-13 2001-07-10 Percussion hydraulic apparatus Expired - Lifetime EP1299213B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0009259A FR2811601B1 (en) 2000-07-13 2000-07-13 HYDRAULIC PERCUSSION APPARATUS
FR0009259 2000-07-13
PCT/FR2001/002228 WO2002006014A1 (en) 2000-07-13 2001-07-10 Percussion hydraulic apparatus

Publications (2)

Publication Number Publication Date
EP1299213A1 EP1299213A1 (en) 2003-04-09
EP1299213B1 true EP1299213B1 (en) 2007-10-24

Family

ID=8852518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01954069A Expired - Lifetime EP1299213B1 (en) 2000-07-13 2001-07-10 Percussion hydraulic apparatus

Country Status (18)

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US (1) US6901842B2 (en)
EP (1) EP1299213B1 (en)
JP (1) JP2004504168A (en)
KR (1) KR100753929B1 (en)
CN (1) CN100436073C (en)
AT (1) ATE376482T1 (en)
AU (2) AU7642401A (en)
BR (1) BR0112347A (en)
CA (1) CA2415359A1 (en)
DE (1) DE60131081T2 (en)
DK (1) DK1299213T3 (en)
ES (1) ES2295186T3 (en)
FR (1) FR2811601B1 (en)
IL (2) IL153493A0 (en)
NO (1) NO318421B1 (en)
PT (1) PT1299213E (en)
WO (1) WO2002006014A1 (en)
ZA (1) ZA200209846B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE527762C2 (en) * 2004-10-14 2006-05-30 Atlas Copco Rock Drills Ab percussion
SE529615C2 (en) * 2006-02-20 2007-10-09 Atlas Copco Rock Drills Ab Percussion and rock drill and method for controlling the stroke of the piston
CN100436751C (en) * 2006-05-25 2008-11-26 中国海洋石油总公司 Underwater hydraulic impacting shovel
FR2916377B1 (en) * 2007-05-25 2009-07-24 Montabert Soc Par Actions Simp METHOD OF PROTECTING AGAINST FLOW SUPPLY OF A DEVICE WITH MUTE PERCUSSIONS BY AN INCOMPRESSIBLE FLUID UNDER PRESSURE AND APPARATUS FOR CARRYING OUT SAID METHOD
SK932007A3 (en) * 2007-07-09 2009-02-05 Konek, S. R. O. Hydraulic scarified hammer
US9656377B2 (en) * 2014-08-08 2017-05-23 Caterpillar Inc. Self-charging hydraulic hammer

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
CA941264A (en) * 1970-04-03 1974-02-05 Etablissements Montabert Dispositif de commande du distributeur d'un appareil a percussions mu par un liquide sous pression
JPS5217266B2 (en) * 1971-10-27 1977-05-14
FI50307C (en) * 1974-04-20 1976-02-10 Xandor Ag Hydraulically operated impactor
FR2369908A1 (en) * 1976-11-08 1978-06-02 Montabert Roger HYDRAULIC PERCUSSION DEVICE
ES464093A1 (en) * 1977-11-12 1978-12-16 Luis Miguel Castejon Castan Fluid arrangement
JPS597570A (en) * 1982-07-05 1984-01-14 北越工業株式会社 Hydraulically operative impact tool
DE3400302A1 (en) * 1984-01-03 1985-08-29 Mannesmann AG, 4000 Düsseldorf HYDRAULIC ACTUATOR
JPH03208571A (en) * 1990-01-12 1991-09-11 Maruzen Kogyo Kk Hydraulic pick hammer
FR2676953B1 (en) * 1991-05-30 1993-08-20 Montabert Ets HYDRAULIC PERCUSSION APPARATUS.
FR2727891B1 (en) * 1994-12-08 1997-01-24 Montabert Ets METHOD AND APPARATUS FOR REGULATING THE STRIKING STROKE OF A PERCUSSION APPARATUS MOUSED BY AN INCOMPRESSIBLE PRESSURE FLUID
FI107891B (en) * 1998-03-30 2001-10-31 Sandvik Tamrock Oy Impact fluid driven impactor

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AU7642401A (en) 2002-01-30
CN1441715A (en) 2003-09-10
CA2415359A1 (en) 2002-01-24
KR100753929B1 (en) 2007-08-31
DE60131081T2 (en) 2008-07-24
NO318421B1 (en) 2005-03-14
BR0112347A (en) 2003-07-01
NO20030125L (en) 2003-03-04
IL153493A0 (en) 2003-07-06
NO20030125D0 (en) 2003-01-10
US6901842B2 (en) 2005-06-07
WO2002006014A1 (en) 2002-01-24
EP1299213A1 (en) 2003-04-09
IL153493A (en) 2006-07-05
ATE376482T1 (en) 2007-11-15
AU2001276424B2 (en) 2006-02-02
FR2811601B1 (en) 2002-10-11
PT1299213E (en) 2007-11-26
KR20030031954A (en) 2003-04-23
ES2295186T3 (en) 2008-04-16
US20040050243A1 (en) 2004-03-18
ZA200209846B (en) 2003-10-03
DE60131081D1 (en) 2007-12-06
FR2811601A1 (en) 2002-01-18
DK1299213T3 (en) 2008-03-03
CN100436073C (en) 2008-11-26
JP2004504168A (en) 2004-02-12

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