EP2150380B1 - Percussion device actuated by a pressurised non compressible fluid - Google Patents

Percussion device actuated by a pressurised non compressible fluid Download PDF

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Publication number
EP2150380B1
EP2150380B1 EP08805823A EP08805823A EP2150380B1 EP 2150380 B1 EP2150380 B1 EP 2150380B1 EP 08805823 A EP08805823 A EP 08805823A EP 08805823 A EP08805823 A EP 08805823A EP 2150380 B1 EP2150380 B1 EP 2150380B1
Authority
EP
European Patent Office
Prior art keywords
drawer
chamber
fluid supply
regulating device
supply circuit
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.)
Not-in-force
Application number
EP08805823A
Other languages
German (de)
French (fr)
Other versions
EP2150380A2 (en
Inventor
Bernard Piras
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.)
Montabert SAS
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Montabert SAS
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Publication date
Application filed by Montabert SAS filed Critical Montabert SAS
Publication of EP2150380A2 publication Critical patent/EP2150380A2/en
Application granted granted Critical
Publication of EP2150380B1 publication Critical patent/EP2150380B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • 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
    • B25D9/02—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously of the tool-carrier piston type, i.e. in which the tool is connected to an impulse member
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2217—Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/042—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in"
    • F15B11/0423—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed by means in the feed line, i.e. "meter in" by controlling pump output or bypass, other than to maintain constant speed
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/05—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed specially adapted to maintain constant speed, e.g. pressure-compensated, load-responsive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/125—Hydraulic tool components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/195—Regulation means
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/41—Flow control characterised by the positions of the valve element
    • F15B2211/413—Flow control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/428—Flow control characterised by the type of actuation actuated by fluid pressure
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • 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
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50536—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using unloading valves controlling the supply pressure by diverting fluid to the return line

Definitions

  • the present invention relates to a percussion apparatus driven by an incompressible fluid under pressure as defined in the preamble of claim 1.
  • a percussion apparatus driven by an incompressible fluid under pressure as defined in the preamble of claim 1.
  • Such an apparatus is known from the document FR 2 863 671 A .
  • Percussion devices driven by an incompressible fluid under pressure are supplied with fluid, so that the resultant hydraulic forces successively applied to the striking piston, moves it alternately in one direction and then in the other.
  • these devices are designed to operate with a fluid whose pressure is induced by the internal resistance of the device or regulated in a range of feed rate chosen during the design of the device.
  • This type of hydraulic machine comprises, in known manner, a selector located in the cabin thereof to select the type of device to supply fluid.
  • a selector located in the cabin thereof to select the type of device to supply fluid.
  • this type of carrier vehicle does not generally include keying upstream of these various accessories, it is possible to accidentally over feed a percussion device mounted on the carrier, and thus to damage the latter.
  • the object of the invention is therefore to provide an apparatus for its implementation, allowing protection of the device against accidental flow overcharges, which is simple, reliable and inexpensive.
  • the present invention relates to a percussion apparatus driven by an incompressible fluid under pressure as defined in claim 1, the fluid supply of which is carried out by a high pressure fluid supply circuit and a return circuit. low pressure, the body of the apparatus comprising a flow control device, the flow control device comprising a first calibrated orifice located on the high pressure fluid supply circuit, a bore formed in the body of the apparatus and in which is mounted a spool whose first face is located in a first chamber connected to the high pressure fluid supply circuit upstream of the first calibrated orifice and the second face is located in a second chamber connected to the supply circuit.
  • the bore receiving the regulator slide having an annular groove re connected to the return circuit of the percussion apparatus, and in that the regulator spool is arranged to connect the annular groove to the first chamber when the pressure difference on either side of the first calibrated orifice increases. beyond a predetermined value, so as to deflect a portion of the fluid flow supplied by the high pressure fluid supply circuit to the return circuit.
  • the configuration of the flow control device and the annular groove makes it possible to limit the flow rate of pressurized fluid that can circulate inside the percussion apparatus to a predetermined value, and thus to avoid accidental over-feeds. of the last.
  • the flow control device makes it possible to send automatically to the return circuit of the apparatus the excess flow rate with respect to a predetermined flow rate value.
  • the first and second chambers are respectively connected to the high pressure fluid supply circuit on either side of the first orifice calibrated by first and second connecting channels.
  • the regulating device comprises a second calibrated orifice situated on the second connecting channel.
  • the bore of the slide of the regulating device is located on the high-pressure fluid supply circuit, and the first calibrated orifice is formed in the body of the slide of the regulating device.
  • the first face of the slide of the regulating device is constantly subjected to the pressure upstream of the first calibrated orifice, while the second face of the slide of the regulating device is constantly subjected to the action of a spring and the pressure downstream of the first calibrated orifice.
  • the annular groove is connected to the first chamber when the pressure difference on either side of the first calibrated orifice is greater than the pressure exerted by the spring on the second face of the slide.
  • the drawer of the regulating device and the bore in which the drawer is mounted comprise a plurality of different successive sections, the drawer and the bore delimiting an annular chamber which is antagonistic to the first chamber and connected to the second chamber by an additional calibrated orifice. .
  • the drawer of the regulating device and the bore in which the drawer is mounted comprise a plurality of different successive sections, the drawer and the bore delimiting an annular chamber which is antagonistic to the second chamber and connected to the circuit. supplying high pressure fluid upstream of the first chamber, through an additional calibrated orifice.
  • the figure 1 represents a percussion apparatus driven by an incompressible fluid under pressure.
  • the percussion apparatus comprises a stepped piston 1 alternately movable inside a stepped cylinder 2 formed in the body 3 of the apparatus, and coming to strike each cycle a tool 4 slidably mounted in a bore 5 arranged in the body 3 coaxially with the cylinder 2.
  • the piston 1 defines with the cylinder 2 a low annular chamber 6 and a higher chamber 7 of larger section formed above the piston 1.
  • a main distributor 8 mounted in the body 3 makes it possible to put the upper chamber 7, alternatively in connection with a high-pressure fluid supply circuit 9 during the accelerated descent stroke of the piston for striking, or with a return circuit low pressure 10 during the ascent of the piston.
  • the annular chamber 6 is permanently supplied with fluid under high pressure by a channel 11 so that each position of the valve spool 8 causes the strike stroke of the piston 1, then the lift stroke.
  • a groove 12 is arranged in the upper part of the piston 1, grooves 13, 14 and channels 15 and 16 are arranged in the body 3 of the apparatus and constitute hydraulic means which allow the triggering of the movement of the main distributor 8.
  • the apparatus shown schematically on the figure 1 also comprises a flow control device 17 mounted on the high-pressure fluid supply circuit 9, and connected to the low-pressure return circuit 10.
  • the regulating device 17 comprises a calibrated orifice 18 which may be of adjustable or fixed section, and a slide 19 whose movement is determined by the pressures 20 and 21 taken on either side of the calibrated orifice 18 and applied to these ends.
  • the regulating device further comprises a spring 22 determining the set value necessary for the movement of the slide 19.
  • the operation of the regulating device 17 can be likened to that of a 3-way hydraulic flow divider which, when the pressure difference on both sides of the calibrated orifice 18 increases beyond a predetermined value, deviates part of the input flow to the return circuit 10.
  • a calibrated orifice of adjustable section makes it possible to set beforehand the flow rate value beyond which a part of the input flow will be diverted towards the return circuit.
  • This arrangement makes it possible to obtain a flow control device forming a standard subassembly that can be adapted to different percussion apparatuses, the section of the calibrated orifice being adjusted beforehand according to the operating characteristics of the percussion apparatus intended to receive said regulating device.
  • the figure 2 represents a second percussion apparatus driven by an incompressible fluid under pressure in which the flow control device 17 comprises a calibrated orifice 23 situated on the pressurized fluid supply circuit 9 which creates, according to the laws of hydraulics, a pressure loss proportional to the flow that passes through it.
  • the regulating device 17 also comprises a bore 24 formed in the body 3 of the apparatus and in which is mounted a spool 25, a first face of which is located in a first chamber 26 connected to the high pressure fluid supply circuit 9. upstream of the calibrated orifice 23 via a first connecting channel 27 and whose second face is located in a second chamber 28 connected to the high pressure fluid supply circuit 9 downstream of the calibrated orifice 23 via a second connecting channel 29.
  • first and second chambers 26, 28 are of equal sections.
  • the first face of the spool 25 is constantly subjected to the pressure upstream of the calibrated orifice 23, while the second face of the spool 25 is constantly subjected to the action of a spring 31 housed in the second chamber 28 and to the pressure downstream of the calibrated orifice 23.
  • the bore 24 of the slide 25 has an annular groove 32 connected to the return circuit 10 of the percussion apparatus via a channel 33.
  • the annular groove 32 is intended to be connected to the first chamber 26 when the pressure difference from and other of the calibrated orifice 23 is greater than the pressure exerted by the spring 31 on the second face of the slide 25.
  • the regulating device 17 further comprises a calibrated orifice 37 located on the second connecting channel 29.
  • the calibrated orifice 37 is intended to oppose the instantaneous flow rate variations between the second chamber 28 and the channel 29 created by the speed of displacement of the slide 25.
  • the damping effect, called “DASH POT”, generated by the calibrated orifice 37 opposing these instantaneous flow rate variations makes it possible to slow the high frequency speed changes of the spool 25 and thus to protect the spring 31 from accelerated mechanical fatigue effects.
  • the figure 4 represents a third percussion apparatus which differs from that shown on the figure 2 in that the bore 24 of the spool 25 is situated on the high pressure fluid supply circuit 9 and in that the calibrated orifice 23 has been replaced by a calibrated orifice 38 formed in the body of the spool 25. of this structure of the regulating device 17 a gain of body material 3 of the apparatus and a simplification of the power supply circuits of the apparatus.
  • the figure 5 represents an alternative embodiment of the percussion apparatus shown in FIG. figure 4 .
  • the regulating device 17 comprises a stepped spool 39 mounted in a stepped bore 40, the bore 40 being located on the high-pressure fluid supply circuit 9.
  • a calibrated orifice 41 is formed in the body drawer 39.
  • the slide 39 and the bore 40 delimit three distinct chambers, namely a first chamber 42 connected to the high-pressure fluid supply circuit upstream of the calibrated orifice 41, a second chamber 43 which is antagonistic to the first chamber 42, connected the high-pressure fluid supply circuit downstream of the calibrated orifice 41 and in which is housed a spring 44, and finally an annular chamber 45 antagonistic to the first chamber 42 and connected to the second chamber 43 by a calibrated orifice 46 .
  • the calibrated orifice 46 is intended to generate a damping effect, called "DASH POT", of the movement of the slide 39 by opposing instantaneous variations in flow rates between the chambers 43 and 45. This arrangement makes it possible to limit the mechanical fatigue of spring 44.
  • the figure 6 represents a fourth percussion apparatus that differs from that shown on the figure 5 in that the annular chamber 45 is antagonistic to the second chamber 43 which comprises the spring 44.
  • the annular chamber 45 is connected to the pressurized fluid supply circuit 9 via a calibrated orifice 47 which is intended to create the same damping effect as the calibrated orifice 46 shown on the figure 5 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Safety Valves (AREA)
  • Earth Drilling (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Measuring Fluid Pressure (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Actuator (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

According to the invention, the body of the apparatus includes a flow rate adjustment device including a calibrated opening provided on a high-pressure fluid supply circuit, a bore formed in the body and in which is mounted a slider having a first face located in a first chamber connected to a high-pressure fluid supply circuit upstream from the calibrated opening and a second face located in a second chamber connected to the high-pressure fluid supply circuit downstream from the calibrated opening, the bore receiving the slide including an annular groove connected to a low pressure feedback circuit. The slider is adapted for connecting the annular groove to the first chamber when the pressure difference on either side of the calibrated opening increases beyond a predetermined value in order to divert a portion of the fluid flow supplied by the high-pressure fluid supply circuit to the feedback circuit.

Description

La présente invention a pour objet un appareil à percussions mû par un fluide incompressible sous pression tel que defini dans le préambule de la revendication 1. Un tel appareil est connu du document FR 2 863 671 A .The present invention relates to a percussion apparatus driven by an incompressible fluid under pressure as defined in the preamble of claim 1. Such an apparatus is known from the document FR 2 863 671 A .

Les appareils à percussions mus par un fluide incompressible sous pression sont alimentés en fluide, de telle manière que la résultante des forces hydrauliques s'appliquant successivement sur le piston de frappe, déplace celui-ci alternativement dans un sens puis dans l'autre. De manière générale, ces appareils sont conçus pour fonctionner avec un fluide dont la pression est induite par la résistance interne de l'appareil ou régulée dans une plage de débit d'alimentation choisie lors de la conception de l'appareil.Percussion devices driven by an incompressible fluid under pressure are supplied with fluid, so that the resultant hydraulic forces successively applied to the striking piston, moves it alternately in one direction and then in the other. In general, these devices are designed to operate with a fluid whose pressure is induced by the internal resistance of the device or regulated in a range of feed rate chosen during the design of the device.

En cas de suralimentation de l'appareil en fluide sous pression, il y a un risque d'augmentation considérable de la pression de fonctionnement. Le mouvement du piston étant généralement uniformément accéléré en fonction de la pression du fluide d'alimentation, la vitesse d'impact de ce piston dépendra donc de cette accélération et pourra dépasser les limites des caractéristiques mécaniques de l'acier si cette vitesse n'est pas maîtrisée. Il est donc essentiel pour l'utilisateur de respecter scrupuleusement les indications techniques du constructeur de l'appareil.In case of over-feeding of the device with pressurized fluid, there is a risk of a considerable increase in the operating pressure. As the piston movement is generally uniformly accelerated as a function of the pressure of the feed fluid, the impact velocity of this piston will therefore depend on this acceleration and may exceed the limits of the mechanical characteristics of the steel if this speed is not sufficient. not mastered. It is therefore essential for the user to scrupulously respect the technical specifications of the manufacturer of the device.

Dans bien des cas, il est nécessaire d'intervenir sur les paramètres hydrauliques de l'engin porteur sur lequel est monté l'apparail à percussions pour pouvoir respecter les données du constructeur de ce dernier, et ces interventions complexes sont sujettes à erreurs.In many cases, it is necessary to intervene on the hydraulic parameters of the carrier on which is mounted the percussion equipment to be able to respect the data of the constructor of the latter, and these complex interventions are prone to errors.

En outre, il apparaît depuis quelques années sur le marché des engins hydrauliques capables de faire fonctionner aussi bien des appareils à percussions, des pinces, des grappins, des broyeurs et autant d'appareils dont les caractéristiques et les besoins en fluide sous pressions sont très différents. Ce type d'engin hydraulique comporte, de façon connue, un sélecteur situé dans la cabine de celui-ci permettant de choisir le type d'appareil à alimenter en fluide. Toutefois, compte tenu du fait que ce type d'engin porteur ne comporte généralement pas de détrompeurs en amont de ces différents accéssoires, il est possible de suralimenter accidentellement un appareil à percussions monté sur l'engin porteur, et donc de détériorer ce dernier.In addition, it appears in recent years in the market for hydraulic machines capable of operating both percussion devices, clamps, grapples, grinders and as many devices whose characteristics and fluid requirements under pressure are very high. different. This type of hydraulic machine comprises, in known manner, a selector located in the cabin thereof to select the type of device to supply fluid. However, in view of the fact that this type of carrier vehicle does not generally include keying upstream of these various accessories, it is possible to accidentally over feed a percussion device mounted on the carrier, and thus to damage the latter.

Le but de l'invention est donc de fournir un appareil pour sa mise en oeuvre, permettant une protection de l'appareil contre des suralimentations en débit accidentelles, qui soit simple, fiable et peu onéreux.The object of the invention is therefore to provide an apparatus for its implementation, allowing protection of the device against accidental flow overcharges, which is simple, reliable and inexpensive.

A cet effet, la présente invention concerne un appareil à percussions mû par un fluide incompressible sous pression tel que défini dans la revendication 1, dont l'alimentation en fluide est réalisée par un circuit d'alimentation en fluide haute pression et un circuit de retour basse pression, le corps de l'appareil comportant un dispositif de régulation de débit, le dispositif de régulation débit comportant un premier orifice calibré situé sur le circuit d'alimentation en fluide haute pression, un alésage ménagé dans le corps de l'appareil et dans lequel est monté un tiroir dont une première face est située dans une première chambre reliée au circuit d'alimentation en fluide haute pression en amont du premier orifice calibré et dont la seconde face est située dans une seconde chambre reliée au circuit d'alimentation en fluide haute pression en aval du premier orifice calibré, l'alésage recevant le tiroir du dispositif de régulation comportant une gorge annulaire reliée au circuit de retour de l'appareil à percussions, et en ce que le tiroir du dispositif de régulation est agencé pour relier la gorge annulaire à la première chambre lorsque la différence des pressions de part et d'autre du premier orifice calibré augmente au delà d'une valeur prédéterminée, de manière à dévier une partie du débit de fluide fourni par le circuit d'alimentation en fluide haute pression vers le circuit de retour.For this purpose, the present invention relates to a percussion apparatus driven by an incompressible fluid under pressure as defined in claim 1, the fluid supply of which is carried out by a high pressure fluid supply circuit and a return circuit. low pressure, the body of the apparatus comprising a flow control device, the flow control device comprising a first calibrated orifice located on the high pressure fluid supply circuit, a bore formed in the body of the apparatus and in which is mounted a spool whose first face is located in a first chamber connected to the high pressure fluid supply circuit upstream of the first calibrated orifice and the second face is located in a second chamber connected to the supply circuit. high pressure fluid downstream of the first calibrated orifice, the bore receiving the regulator slide having an annular groove re connected to the return circuit of the percussion apparatus, and in that the regulator spool is arranged to connect the annular groove to the first chamber when the pressure difference on either side of the first calibrated orifice increases. beyond a predetermined value, so as to deflect a portion of the fluid flow supplied by the high pressure fluid supply circuit to the return circuit.

Ainsi, la configuration du dispositif de régulation de débit et de la gorge annulaire permet de limiter à une valeur prédéterminée le débit de fluide sous pression qui peut circuler à l'intérieur de l'appareil à percussions, et donc d'éviter des suralimentations accidentelles de ce dernier.Thus, the configuration of the flow control device and the annular groove makes it possible to limit the flow rate of pressurized fluid that can circulate inside the percussion apparatus to a predetermined value, and thus to avoid accidental over-feeds. of the last.

Ainsi, le dispositif de régulation de débit selon l'invention permet d'envoyer automatiquement vers le circuit de retour de l'appareil le débit excédentaire par rapport à une valeur de débit prédéterminée.Thus, the flow control device according to the invention makes it possible to send automatically to the return circuit of the apparatus the excess flow rate with respect to a predetermined flow rate value.

Avantageusement, les première et seconde chambres sont respectivement reliées au circuit d'alimentation en fluide haute pression de part et d'autre du premier orifice calibré par des premier et second canaux de liaison.Advantageously, the first and second chambers are respectively connected to the high pressure fluid supply circuit on either side of the first orifice calibrated by first and second connecting channels.

De préférence, le dispositif de régulation comprend un second orifice calibré situé sur le second canal de liaison.Preferably, the regulating device comprises a second calibrated orifice situated on the second connecting channel.

Selon une alternative de l'invention, l'alésage du tiroir du dispositif de régulation est situé sur le circuit d'alimentation en fluide haute pression, et le premier orifice calibré est ménagé dans le corps du tiroir du dispositif de régulation.According to an alternative of the invention, the bore of the slide of the regulating device is located on the high-pressure fluid supply circuit, and the first calibrated orifice is formed in the body of the slide of the regulating device.

Selon une caractéristique de l'invention, la première face du tiroir du dispositif de régulation est constamment soumise à la pression en amont du premier orifice calibré, tandis que la seconde face du tiroir du dispositif de régulation est constamment soumise à l'action d'un ressort et à la pression en aval du premier orifice calibrée.According to a characteristic of the invention, the first face of the slide of the regulating device is constantly subjected to the pressure upstream of the first calibrated orifice, while the second face of the slide of the regulating device is constantly subjected to the action of a spring and the pressure downstream of the first calibrated orifice.

Selon une autre caractéristique de l'invention, la gorge annulaire est reliée à la première chambre lorsque la différence de pression de part et d'autre du premier orifice calibré est supérieure à la pression exercée par le ressort sur la seconde face du tiroir.According to another characteristic of the invention, the annular groove is connected to the first chamber when the pressure difference on either side of the first calibrated orifice is greater than the pressure exerted by the spring on the second face of the slide.

Avantageusement, le tiroir du dispositif de régulation et l'alésage dans lequel est monté le tiroir comprennent plusieurs sections successives différentes, le tiroir et l'alésage délimitant une chambre annulaire antagoniste à la première chambre et reliée à la seconde chambre par un orifice calibré supplémentaire.Advantageously, the drawer of the regulating device and the bore in which the drawer is mounted comprise a plurality of different successive sections, the drawer and the bore delimiting an annular chamber which is antagonistic to the first chamber and connected to the second chamber by an additional calibrated orifice. .

Selon une autre alternative de l'invention, le tiroir du dispositif de régulation et l'alésage dans lequel est monté le tiroir comprennent plusieurs sections successives différentes, le tiroir et l'alésage délimitant une chambre annulaire antagoniste à la seconde chambre et reliée au circuit d'alimentation en fluide haute pression en amont de la première chambre, par un orifice calibré supplémentaire.According to another alternative of the invention, the drawer of the regulating device and the bore in which the drawer is mounted comprise a plurality of different successive sections, the drawer and the bore delimiting an annular chamber which is antagonistic to the second chamber and connected to the circuit. supplying high pressure fluid upstream of the first chamber, through an additional calibrated orifice.

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

  • Figure 1 représente une vue schématique en coupe longitudinale d'un premier appareil à percussions qui ne fait pas partie de l'invention.
  • Figure 2 représente une vue en coupe longitudinale d'un deuxième appareil à percussions.
  • Figure 3 représente une vue en coupe longitudinale d'une variante de l'appareil représenté en figure 2.
  • Figure 4 représente une vue en coupe longitudinale d'un troisième appareil à percussions.
  • Figure 5 représente une vue en coupe longitudinale d'une variante de l'appareil représenté en figure 4.
  • Figure 6 représente une vue en coupe longitudinale d'un quatrième appareil à percussions.
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, as non-limiting examples, several embodiments of the apparatus.
  • Figure 1 is a schematic longitudinal sectional view of a first percussion apparatus which is not part of the invention.
  • Figure 2 is a longitudinal sectional view of a second percussion apparatus.
  • Figure 3 is a longitudinal sectional view of a variant of the apparatus shown in FIG. figure 2 .
  • Figure 4 is a longitudinal sectional view of a third percussion apparatus.
  • Figure 5 is a longitudinal sectional view of a variant of the apparatus shown in FIG. figure 4 .
  • Figure 6 is a longitudinal sectional view of a fourth percussion apparatus.

La figure 1 représente un appareil à percussions mû par un fluide incompressible sous pression.The figure 1 represents a percussion apparatus driven by an incompressible fluid under pressure.

L'appareil à percussions comprend un piston étagé 1 déplaçable de façon alternative à l'intérieur d'un cylindre étagé 2 ménagé dans le corps 3 de l'appareil, et venant percuter à chaque cycle un outil 4 monté coulissant dans un alésage 5 ménagé dans le corps 3 coaxialement au cylindre 2.The percussion apparatus comprises a stepped piston 1 alternately movable inside a stepped cylinder 2 formed in the body 3 of the apparatus, and coming to strike each cycle a tool 4 slidably mounted in a bore 5 arranged in the body 3 coaxially with the cylinder 2.

Le piston 1 délimite avec le cylindre 2 une chambre annulaire basse 6 et une chambre haute 7 de section plus importante ménagée au dessus du piston 1.The piston 1 defines with the cylinder 2 a low annular chamber 6 and a higher chamber 7 of larger section formed above the piston 1.

Un distributeur principal 8 monté dans le corps 3 permet de mettre la chambre haute 7, alternativement en relation avec un circuit d'alimentation en fluide haute pression 9 lors de la course de descente accélérée du piston pour la frappe, ou avec un circuit de retour basse pression 10 lors de la remontée du piston.A main distributor 8 mounted in the body 3 makes it possible to put the upper chamber 7, alternatively in connection with a high-pressure fluid supply circuit 9 during the accelerated descent stroke of the piston for striking, or with a return circuit low pressure 10 during the ascent of the piston.

La chambre annulaire 6 est alimentée en permanence en fluide sous haute pression par un canal 11 de manière à ce que chaque position du tiroir du distributeur 8 provoque la course de frappe du piston 1, puis la course de remontée.The annular chamber 6 is permanently supplied with fluid under high pressure by a channel 11 so that each position of the valve spool 8 causes the strike stroke of the piston 1, then the lift stroke.

Une gorge 12 est aménagée dans la partie haute du piston 1, des gorges 13, 14 et des canaux 15 et 16 sont aménagés dans le corps 3 de l'appareil et constituent des moyens hydrauliques qui permettent le déclenchement du mouvement du distributeur principal 8.A groove 12 is arranged in the upper part of the piston 1, grooves 13, 14 and channels 15 and 16 are arranged in the body 3 of the apparatus and constitute hydraulic means which allow the triggering of the movement of the main distributor 8.

L'appareil représenté schématiquement sur la figure 1 comprend également un dispositif de régulation de débit 17 monté sur le circuit d'alimentation en fluide haute pression 9, et connecté au circuit de retour basse pression 10.The apparatus shown schematically on the figure 1 also comprises a flow control device 17 mounted on the high-pressure fluid supply circuit 9, and connected to the low-pressure return circuit 10.

Le dispositif de régulation 17 comprend un orifice calibré 18 qui peut être de section réglable ou fixe, et un tiroir 19 dont le mouvement est déterminé par les pressions 20 et 21 prises de part et d'autre de l'orifice calibré 18 et appliquées à ces extrémités. Le dispositif de régulation comprend en outre un ressort 22 déterminant la valeur de consigne nécessaire au mouvement du tiroir 19. Le fonctionnement du dispositif de régulation 17 peut être assimilé à celui d'un diviseur de débit hydraulique 3 voies qui, lorsque la différence de pressions de part et d'autre de l'orifice calibré 18 augmente au delà d'une valeur prédéterminée, dévie une partie du débit d'entrée vers le circuit de retour 10.The regulating device 17 comprises a calibrated orifice 18 which may be of adjustable or fixed section, and a slide 19 whose movement is determined by the pressures 20 and 21 taken on either side of the calibrated orifice 18 and applied to these ends. The regulating device further comprises a spring 22 determining the set value necessary for the movement of the slide 19. The operation of the regulating device 17 can be likened to that of a 3-way hydraulic flow divider which, when the pressure difference on both sides of the calibrated orifice 18 increases beyond a predetermined value, deviates part of the input flow to the return circuit 10.

L'utilisation d'un orifice calibré de section réglable permet de régler préalablement la valeur de débit au-delà de laquelle une partie du débit d'entrée sera déviée vers le circuit de retour. Cette disposition permet d'obtenir un dispositif de régulation de débit formant un sous-ensemble standard adaptable à différents appareils à percussions, la section de l'orifice calibré étant réglée préalablement en fonction des caractéristiques de fonctionnement de l'appareil à percussions destiné à recevoir ledit dispositif de régulation.The use of a calibrated orifice of adjustable section makes it possible to set beforehand the flow rate value beyond which a part of the input flow will be diverted towards the return circuit. This arrangement makes it possible to obtain a flow control device forming a standard subassembly that can be adapted to different percussion apparatuses, the section of the calibrated orifice being adjusted beforehand according to the operating characteristics of the percussion apparatus intended to receive said regulating device.

Différents modes de réalisation de ce dispositif de régulation de débit selon l'invention vont maintenant être décrits.Different embodiments of this flow control device according to the invention will now be described.

La figure 2 représente un second appareil à percussions mû par un fluide incompressible sous pression dans lequel le dispositif de régulation de débit 17 comprend un orifice calibré 23 situé sur le circuit d'alimentation en fluide sous pression 9 qui crée, suivant les lois de l'hydraulique, une perte de charge proportionnelle au débit qui le traverse.The figure 2 represents a second percussion apparatus driven by an incompressible fluid under pressure in which the flow control device 17 comprises a calibrated orifice 23 situated on the pressurized fluid supply circuit 9 which creates, according to the laws of hydraulics, a pressure loss proportional to the flow that passes through it.

Le dispositif de régulation 17 comprend également un alésage 24 ménagé dans le corps 3 de l'appareil et dans lequel est monté un tiroir 25 dont une première face est située dans une première chambre 26 reliée au circuit d'alimentation en fluide haute pression 9 en amont de l'orifice calibré 23 par l'intermédiaire d'un premier canal de liaison 27 et dont la seconde face est située dans une seconde chambre 28 reliée au circuit d'alimentation en fluide haute pression 9 en aval de l'orifice calibré 23 par l'intermédiaire d'un second canal de liaison 29. Il doit être noté que les première et seconde chambres 26, 28 sont de sections égales.The regulating device 17 also comprises a bore 24 formed in the body 3 of the apparatus and in which is mounted a spool 25, a first face of which is located in a first chamber 26 connected to the high pressure fluid supply circuit 9. upstream of the calibrated orifice 23 via a first connecting channel 27 and whose second face is located in a second chamber 28 connected to the high pressure fluid supply circuit 9 downstream of the calibrated orifice 23 via a second connecting channel 29. It should be noted that the first and second chambers 26, 28 are of equal sections.

La première face du tiroir 25 est constamment soumise à la pression en amont de l'orifice calibré 23, tandis que la seconde face du tiroir 25 est constamment soumise à l'action d'un ressort 31 logé dans la seconde chambre 28 et à la pression en aval de l'orifice calibrée 23.The first face of the spool 25 is constantly subjected to the pressure upstream of the calibrated orifice 23, while the second face of the spool 25 is constantly subjected to the action of a spring 31 housed in the second chamber 28 and to the pressure downstream of the calibrated orifice 23.

L'alésage 24 du tiroir 25 comporte une gorge annulaire 32 reliée au circuit de retour 10 de l'appareil à percussions par un canal 33. La gorge annulaire 32 est destinée à être reliée à la première chambre 26 lorsque la différence de pression de part et d'autre de l'orifice calibré 23 est supérieure à la pression exercée par le ressort 31 sur la seconde face du tiroir 25.The bore 24 of the slide 25 has an annular groove 32 connected to the return circuit 10 of the percussion apparatus via a channel 33. The annular groove 32 is intended to be connected to the first chamber 26 when the pressure difference from and other of the calibrated orifice 23 is greater than the pressure exerted by the spring 31 on the second face of the slide 25.

Lors d'un fonctionnement de l'appareil à percussions dans les limites de débits fixées par le constructeur de ce dernier, la différence de pressions de part et d'autre de l'orifice calibré 23 ne génère pas une force différentielle suffisante sur le tiroir 25 pour contrer la force réactive créée par le ressort 31. De ce fait, la gorge annulaire 32 ne peut être reliée à la première chambre 26. Il en résulte qu'il n'y a pas de décharge de débit vers le circuit de retour 10.During operation of the percussion apparatus within the flow limits set by the manufacturer of the latter, the difference in pressures on both sides of the calibrated orifice 23 does not generate a sufficient differential force on the spool 25 to counteract the reactive force created by the spring 31. As a result, the annular groove 32 can not be connected to the first one. 26. As a result, there is no flow discharge to the return circuit 10.

En revanche, dès que le débit d'alimentation en fluide sous pression excède une valeur maximum prédéterminée, la différence des forces hydrauliques appliquées sur le tiroir 25 dépasse la résistance du ressort 31, ce qui entraîne un déplacement du tiroir 25 à l'oposée de la première chambre 26. Lorsque l'arête 34 du tiroir 25 découvre l'arête 35 de la gorge annulaire 32, la première chambre 26 est reliée à la gorge annulaire 32, et du fluide sous pression est dévié vers le circuit de retour basse pression 10 de manière à ne laisser circuler dans l'orifice calibré 23 que le débit maximum admissible proportionnel à la perte de charge créée.On the other hand, as soon as the rate of supply of pressurized fluid exceeds a predetermined maximum value, the difference of the hydraulic forces applied on the spool 25 exceeds the resistance of the spring 31, which causes a displacement of the spool 25 to the oposite of the first chamber 26. When the edge 34 of the slide 25 discovers the edge 35 of the annular groove 32, the first chamber 26 is connected to the annular groove 32, and pressurized fluid is diverted to the low pressure return circuit 10 so as to circulate in the calibrated orifice 23 that the maximum allowable flow proportional to the pressure loss created.

Il doit être noté que le mouvement alternatif du piston de frappe 1 sous l'action des forces hydraulique crée des fluctuations de la pression du fluide d'alimentation qui, bien qu'atténuées par l'accumulateur 36, risquent d'entraîner un déplacement du tiroir 25 à une fréquence trop élevée pour la bonne tenue à la fatigue mécanique du ressort 31.It should be noted that the reciprocating movement of the striking piston 1 under the action of the hydraulic forces creates fluctuations in the pressure of the supply fluid which, although attenuated by the accumulator 36, may cause a displacement of the drawer 25 at a frequency too high for the good resistance to mechanical fatigue of the spring 31.

Pour pallier cet inconvénient, selon une variante de réalisation du second appareil à percussions représentée sur la figure 3, le dispositif de régulation 17 comprend en outre un orifice calibré 37 situé sur le second canal de liaison 29.To overcome this drawback, according to an alternative embodiment of the second percussion apparatus shown in FIG. figure 3 , the regulating device 17 further comprises a calibrated orifice 37 located on the second connecting channel 29.

L'orifice calibré 37 est destiné à s'opposer aux variations instantanées de débit entre la seconde chambre 28 et le canal 29 créées par la vitesse de déplacement du tiroir 25. L'effet d'amortissement, dit « DASH POT », généré par l'orifice calibré 37 en s'opposant à ces variations instantanées de débit permet de ralentir les changements de vitesse à haute fréquence du tiroir 25 et donc de protéger le ressort 31 des effets de fatigue mécanique accélérée.The calibrated orifice 37 is intended to oppose the instantaneous flow rate variations between the second chamber 28 and the channel 29 created by the speed of displacement of the slide 25. The damping effect, called "DASH POT", generated by the calibrated orifice 37 opposing these instantaneous flow rate variations makes it possible to slow the high frequency speed changes of the spool 25 and thus to protect the spring 31 from accelerated mechanical fatigue effects.

La figure 4 représente un troisième appareil à percussions qui diffère de celui représenté sur la figure 2 en ce que l'alésage 24 du tiroir 25 est situé sur le circuit d'alimentation en fluide haute pression 9 et en ce que l'orifice calibré 23 a été remplacé par un orifice calibré 38 ménagé dans le corps du tiroir 25. Il résulte de cette structure du dispositif de régulation 17 un gain de matière du corps 3 de l'appareil et une simplification des circuits d'alimentation de l'appareil.The figure 4 represents a third percussion apparatus which differs from that shown on the figure 2 in that the bore 24 of the spool 25 is situated on the high pressure fluid supply circuit 9 and in that the calibrated orifice 23 has been replaced by a calibrated orifice 38 formed in the body of the spool 25. of this structure of the regulating device 17 a gain of body material 3 of the apparatus and a simplification of the power supply circuits of the apparatus.

La figure 5 représente une variante de réalisation de l'appareil à percussions représenté en figure 4.The figure 5 represents an alternative embodiment of the percussion apparatus shown in FIG. figure 4 .

Selon ce mode de réalisation, le dispositif de régulation 17 comprend un tiroir étagé 39 monté dans un alésage étagé 40, l'alésage 40 étant situé sur le circuit d'alimentation en fluide haute pression 9. Un orifice calibré 41 est ménagé dans le corps du tiroir 39.According to this embodiment, the regulating device 17 comprises a stepped spool 39 mounted in a stepped bore 40, the bore 40 being located on the high-pressure fluid supply circuit 9. A calibrated orifice 41 is formed in the body drawer 39.

Le tiroir 39 et l'alésage 40 délimitent trois chambres distinctes, à savoir une première chambre 42 reliée au circuit d'alimentation en fluide haute pression en amont de l'orifice calibré 41, une seconde chambre 43 antagoniste à la première chambre 42, reliée au circuit d'alimentation en fluide haute pression en aval de l'orifice calibré 41 et dans laquelle est logé un ressort 44, et enfin une chambre annulaire 45 antagoniste à la première chambre 42 et reliée à la seconde chambre 43 par un orifice calibré 46.The slide 39 and the bore 40 delimit three distinct chambers, namely a first chamber 42 connected to the high-pressure fluid supply circuit upstream of the calibrated orifice 41, a second chamber 43 which is antagonistic to the first chamber 42, connected the high-pressure fluid supply circuit downstream of the calibrated orifice 41 and in which is housed a spring 44, and finally an annular chamber 45 antagonistic to the first chamber 42 and connected to the second chamber 43 by a calibrated orifice 46 .

Il doit être noté que la somme des sections respectives des chambres 43 et 45 est égale à la section de la première chambre 42. Ainsi, l'équilibre en fonctionnement du tiroir 39 sera identique à celui du tiroir 25 qui délimite avec son alésage deux chambres antagonistes de sections égales.It should be noted that the sum of the respective sections of the chambers 43 and 45 is equal to the section of the first chamber 42. Thus, the equilibrium in operation of the drawer 39 will be identical to that of the drawer 25 which defines with its bore two chambers antagonists of equal sections.

L'orifice calibré 46 est destiné à générer un effet d'amortissement, dit « DASH POT », du mouvement du tiroir 39 en s'opposant aux variations instantanées de débits entre les chambres 43 et 45. Cette disposition permet de limiter la fatigue mécanique du ressort 44.The calibrated orifice 46 is intended to generate a damping effect, called "DASH POT", of the movement of the slide 39 by opposing instantaneous variations in flow rates between the chambers 43 and 45. This arrangement makes it possible to limit the mechanical fatigue of spring 44.

La figure 6 représente un quatrième appareil à percussions qui diffère de celui représenté sur la figure 5 en ce que la chambre annulaire 45 est antagoniste à la seconde chambre 43 qui comprend le ressort 44. Afin que l'équilibre des pressions soit préservé, la chambre annulaire 45 est reliée au circuit d'alimentation en fluide sous pression 9 par un orifice calibré 47 qui est destiné à créer le même effet d'amortissement que l'orifice calibré 46 montré sur la figure 5.The figure 6 represents a fourth percussion apparatus that differs from that shown on the figure 5 in that the annular chamber 45 is antagonistic to the second chamber 43 which comprises the spring 44. In order that the pressure balance is preserved, the annular chamber 45 is connected to the pressurized fluid supply circuit 9 via a calibrated orifice 47 which is intended to create the same damping effect as the calibrated orifice 46 shown on the figure 5 .

Comme il va de soi, l'invention ne se limite pas aux seules formes d'exécution de cet appareil, décrites ci-dessus à titre d'exemples, elle en embrasse au contraire toutes les variantes de réalisation dans le cadre des revendications.As goes without saying, the invention is not limited to the embodiments of this apparatus, described above as examples, it encompasses all the variants within the scope of the claims.

Claims (8)

  1. An impact apparatus moved by an incompressible pressurized fluid, whereof the fluid supply is done by a high-pressure fluid supply circuit (9) and a low-pressure return circuit (10), the body (3) of the apparatus comprising a flow regulating device (17), characterized in that the flow regulating device (17) comprises a first calibrated opening (23, 38, 41) situated on the high-pressure fluid supply circuit, a bore (24, 40) formed in the body (3) of the apparatus and in which a drawer (25, 39) is mounted whereof a first surface is situated in a first chamber (26, 42) connected to the high-pressure fluid supply circuit upstream of the first calibrated opening (23, 38, 41) and whereof the second surface is situated in a second chamber (28, 43) connected to the high-pressure fluid supply circuit downstream of the first calibrated opening (23, 38, 41), the bore (24, 40) receiving the drawer (25, 39) of the regulating device (17) comprising an annular groove (32) connected to the return circuit (10) of the impact apparatus, and in that the drawer of the regulating device (17) is arranged to connect the annular groove (32) to the first chamber (26, 42) when the difference in the pressures on either side of the first calibrated opening (23, 38, 41) increases past a predetermined value, so as to deflect part of the fluid flow supplied by the high-pressure fluid supply circuit toward the return circuit (10).
  2. The impact apparatus according to claim 1, characterized in that the first and second chambers (26, 28) are respectively connected to the high-pressure fluid supply circuit (9) on either side of the first calibrated opening (23) by first and second connecting channels (27, 29).
  3. The impact apparatus according to claim 2, characterized in that the regulating device (17) comprises a second calibrated opening (37) situated on the second connecting channel (29).
  4. The impact apparatus according to claim 1, characterized in that the bore (24, 40) of the drawer (25, 39) of the regulating device is situated on the high-pressure fluid supply circuit (9), and in that the first calibrated opening (38, 41) is formed in the body of the drawer of the regulating device.
  5. The impact apparatus according to claim 4, characterized in that the drawer (39) of the regulating device (17) and the bore (40) in which the drawer (39) is mounted comprise several different successive sections, the drawer and the bore delimiting an annular chamber (45) antagonistic to the first chamber (42) and connected to the second chamber (43) by an additional calibrated opening (46).
  6. The impact apparatus according to claim 4, characterized in that the drawer (39) of the regulating device and the bore (40) in which the drawer is mounted comprise several different successive sections, the drawer and the bore delimiting an annular chamber (45) antagonistic to the second chamber (43) and connected to the high-pressure fluid supply circuit (9) upstream of the first chamber, by an additional calibrated opening (47).
  7. The impact apparatus according to one of claims 1 to 6, characterized in that the first surface of the drawer (25, 39) of the regulating device is constantly subjected to the pressure upstream of the first calibrated opening (23, 38, 41), whereas the second surface of the drawer of the regulating device is constantly subject to the action of a spring (31, 44) and the pressure downstream of the first calibrated opening.
  8. The impact apparatus according to claim 7, characterized in that the annular groove (32) is connected to the first chamber (26, 42) when the pressure difference on either side of the first calibrated opening (23, 38, 41) is greater than the pressure exerted by the spring (31, 44) on the second surface of the drawer (25, 39).
EP08805823A 2007-05-25 2008-05-21 Percussion device actuated by a pressurised non compressible fluid Not-in-force EP2150380B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0703727A FR2916377B1 (en) 2007-05-25 2007-05-25 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
PCT/FR2008/050877 WO2008149030A2 (en) 2007-05-25 2008-05-21 Percussion device actuated by a pressurised non compressible fluid

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EP2150380A2 EP2150380A2 (en) 2010-02-10
EP2150380B1 true EP2150380B1 (en) 2012-04-18

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EP (1) EP2150380B1 (en)
KR (1) KR101455705B1 (en)
CN (1) CN101678542B (en)
AT (1) ATE553889T1 (en)
ES (1) ES2384079T3 (en)
FR (1) FR2916377B1 (en)
WO (1) WO2008149030A2 (en)

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FR2837523B1 (en) * 2002-03-19 2004-05-14 Montabert Sa ROTO-PERCUTANT HYDRAULIC PERFORATOR HAMMER
FR2863671B1 (en) * 2003-12-11 2006-01-13 Montabert Roger PRESSURE REGULATING DEVICE FOR PERCUSSION HYDRAULIC DEVICE

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ES2384079T3 (en) 2012-06-29
WO2008149030A2 (en) 2008-12-11
CN101678542A (en) 2010-03-24
EP2150380A2 (en) 2010-02-10
ATE553889T1 (en) 2012-05-15
US20100084152A1 (en) 2010-04-08
WO2008149030A3 (en) 2009-01-29
FR2916377A1 (en) 2008-11-28
KR20100017110A (en) 2010-02-16
CN101678542B (en) 2011-12-28
KR101455705B1 (en) 2014-10-28
FR2916377B1 (en) 2009-07-24
US8167055B2 (en) 2012-05-01

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