EP0715932A1 - Verfahren und Vorrichtung zum Einstellen des Schlaghubes einer, von einem inkompressiblen Fluid angetriebenen, Schlagvorrichtung - Google Patents

Verfahren und Vorrichtung zum Einstellen des Schlaghubes einer, von einem inkompressiblen Fluid angetriebenen, Schlagvorrichtung Download PDF

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Publication number
EP0715932A1
EP0715932A1 EP95420353A EP95420353A EP0715932A1 EP 0715932 A1 EP0715932 A1 EP 0715932A1 EP 95420353 A EP95420353 A EP 95420353A EP 95420353 A EP95420353 A EP 95420353A EP 0715932 A1 EP0715932 A1 EP 0715932A1
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EP
European Patent Office
Prior art keywords
fluid
drawer
distributor
piston
stroke
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.)
Granted
Application number
EP95420353A
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English (en)
French (fr)
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EP0715932B1 (de
Inventor
Jean Sylvain Comarmond
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
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Publication of EP0715932A1 publication Critical patent/EP0715932A1/de
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Publication of EP0715932B1 publication Critical patent/EP0715932B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof

Definitions

  • the subject of the present invention is a process for automatic regulation of the stroke of the striking piston of a percussion device driven by an incompressible fluid under pressure and a device for implementing this process.
  • Percussion devices driven by an incompressible fluid under pressure are supplied with fluid, so that the result of the hydraulic forces applied successively on the striking piston, displaces the latter alternately in one direction then in the other.
  • the piston moves alternately inside a bore or cylinder, in which is formed, above the piston, a chamber which, delimited in part by the latter, is called so conventional: upper room.
  • a chamber which, delimited in part by the latter, is called so conventional: upper room.
  • this chamber is supplied with pressurized fluid, the hydraulic force which is created there allows the piston to describe its stroke.
  • a second chamber also partially delimited by the piston, conventionally called: lower chamber.
  • the resulting force of the fluid pressure in the lower chamber ensures the displacement of the piston for its return stroke.
  • the overall power of a device is expressed by the product of the value of the striking frequency and the value of the energy per stroke.
  • the energy per stroke is the kinetic energy given to the piston, which depends on the stroke and the supply pressure.
  • Patent EP 0 214 064 describes an apparatus which makes it possible to obtain an automatic adaptation of the percussion parameters, thanks to the presence in the cylinder of the apparatus of a channel supplied with fluid according to the position of the piston after the impact and the possible rebound of the piston on the tool.
  • Patent EP 0 256 955 describes an apparatus which makes it possible to obtain the same result, depending on the pressure variations in the upper chamber or the lower chamber, consecutive to the rebound effect of the piston on the tool, thanks to the presence of a hydraulic element sensitive to these variations.
  • the object of the invention is to provide a method and an apparatus for its implementation, allowing an automatic adaptation of the frequency and of the energy by stroke of the piston of a percussion apparatus, which is simple, reliable and compact. , to be able to equip in particular small and medium power devices.
  • the invention relates to a method of regulating the striking stroke of a percussion device, driven by an incompressible fluid under pressure, comprising a piston moving inside a cylinder and delimiting therewith.
  • a distributor connected to a control device making it possible to vary the stroke of the striking piston, and comprising a drawer mounted in a cylinder on the 'one side of which acts a spring and the other side of which can be subjected to fluid pressure, this drawer comprising a groove connected, on the one hand, to the distributor and, on the other hand, and depending on the position axial of the drawer, to one of several channels opening into the cylinder and capable of being placed in communication with the lower chamber at the end of the movement of movement of the striking piston upwards, characterized in that it co nsist, during the piston rebound phase following impact, to determine the possible existence of an instantaneous flow of fluid flowing from the upper chamber to the high pressure fluid supply circuit, determined to
  • this method consists in carrying out the possible supply of pressurized fluid to the control device, only during the rebound phase of the piston, at the start of the movement of the distributor and while the distributor still supplies the upper chamber with fluid under high pressure.
  • an apparatus for implementing this method comprises a control slide subjected to the opposing pressures of fluid prevailing, respectively, in the upper chamber and in the supply circuit of the upper fluid chamber under high pressure, this drawer opening a circuit for supplying the device for controlling the fluid under pressure, when the difference between the pressure in the upper chamber and the pressure in the supply circuit exceeds a predetermined value.
  • control drawer is mounted in a cylinder delimiting with the drawer two opposite chambers connected, respectively, to the upper chamber and to the channel for supplying fluid under high pressure, and into which open two channels connected, respectively, to a source of pressurized fluid and to the piloting, these two channels being capable of being brought into communication by a groove which the control slide comprises, in a certain axial position thereof.
  • the source of pressurized fluid supplying the piloting device through the cylinder of the control slide can be constituted by the high pressure supply circuit itself or, by the upper chamber.
  • the cylinder of the control slide can therefore be connected to one or the other of these two pressure sources.
  • the supply pipe of the piloting device with pressurized fluid passes through a drawer device, the movement of which is mechanically linked to the movement of the distributor, and which comprises a groove which, depending on the position of the drawer, allows or does not allow the passage of pressurized fluid in the direction of the selector slide stroke of the striking piston, belonging to the steering system.
  • the groove of the drawer, associated with the distributor is positioned in such a way that it allows the passage of pressurized fluid only during the start of the stroke of the distributor drawer, at a time when the distributor still allows the supply of high pressure fluid to the upper chamber.
  • the drawer, associated with the dispenser can either be independent of the dispenser drawer, or be an integral part thereof.
  • this device comprises a leakage channel, in permanent or momentary communication with the supply circuit of the piloting device with pressurized fluid, intended to evacuate, at each cycle, a defined quantity of fluid, to bring the drawer of the control device in the direction of reduction of the stroke of the impact piston, when this control device is no longer sufficiently supplied with pressurized fluid.
  • the apparatus represented in FIG. 1, is a percussion apparatus comprising a piston 1 sliding in a body 2, and coming into strike at each cycle with a tool 3.
  • a main distributor mounted in the body 2, comprising a drawer 4, allows to put the upper chamber 8 formed above the piston, alternately in relation to the supply of high pressure fluid 5, as shown in Figure 1, or with the low pressure circuit 6, as shown in Figure 2.
  • the piston 1 forms with the body 2, a lower annular chamber 9, permanently supplied by the channel 5, so that each position of the dispenser drawer, causes the striking stroke of the piston 1, then the stroke of ascent.
  • the device comprises a drawer 15 comprising two opaque piloting chambers: on the one hand the chamber 20 connected by a channel 22 to the channel for supplying fluid under high pressure and, on the other hand, the chamber 21 connected to the upper chamber 8.
  • the apparatus also includes a second drawer 23 whose movement is mechanically linked to the movement of the drawer 4 of the main distributor and which comprises a groove 24 making it possible to stop or let pass the fluid between a channel 16 coming from the first drawer 15 and a channel 18 ending in the control chamber of the stroke selector drawer 13.
  • the circuit for controlling the travel selector 13 comprises a channel 14 connected to the conduit 5 for fluid under high pressure, the drawer 15, the channel 16, the drawer 23, and the channel 18 opening onto a section of the travel selector drawer 13.
  • the slide 15 is constantly kept in the low position by the supply pressure from the channel 5 and the accumulator 7 via the channel 22 and applying to the largest diameter of the drawer, while the annular section of this drawer is connected to the low pressure circuit 6 by a channel 24.
  • the channel 14, connected to the supply channel 5, does not communicate with the channel 16.
  • the control section of the travel selector 13 is not supplied and this selector, thanks to the spring 19, remains in the low position, putting in communication the control channel 12 of the distributor 4 with the channel 11 corresponding to the short stroke of strike of the piston 1.
  • FIG. 3 represents the position of the moving parts when the ground, encountered by the tool, is hard.
  • the striking piston 1 rebounds just after its impact on the tool 3 and repels the fluid in the channel 17, while the main distributor 4 is still in the position of figure 1 and begins to pass from the position of figure 1 towards the position of figure 2.
  • this differential pressure is sufficient to raise the drawer 15.
  • the drawer 15 puts the channel 14 and the channel 16 in communication via a groove 15a.
  • the distributor 4 changes position, and the slide 23, linked to this distributor, briefly connects the channel 16 to the channel 18.
  • the fluid passing successively from the channel 14 to the channel 16, then to the channel 18, supplies the piloting section of the travel selector 13, and allows this selector to be pushed back against the action of the spring 19.
  • This selector 13 then puts the pilot channel 12 into communication of the main distributor 4 with the channel 10 corresponding to the large striking stroke of the piston 1.
  • the slide 15 is set in motion only when the instantaneous flow goes from the upper chamber 8 to the channel 5, via the channel 17.
  • the drawer 15 remains stationary.
  • the channel 22 can be connected to the channel 17, instead of the channel 5.
  • the movement of the slide 15 is only sensitive to the pressure drop due to the instantaneous flow coming out of the upper room 8.
  • FIG. 3 shows the position of the moving parts when, during the rebound of the piston, the slide 23, the movement of which is linked to that of the distributor 4, lets the fluid pass from channel 16 to channel 18 and the selector 13, a selected moment, as a function of the relative position of the groove 24 of this drawer and the outlet of the channels 16 and 18.
  • This drawer 23 has a central channel 28 opening into an annular groove, making it possible to connect both the channel 16, the channel 18 and, through a calibrated orifice, the low pressure circuit 6.
  • the movements of the striking piston 1 and of the distributor 4 remain constantly linked to each other.
  • the distributor drawer and the drawer 23 will therefore be in a precise position.
  • the right choice is to establish communication between channels 16 and 18, a few moments after the shock.
  • the drawer 15 tends to rise under the effect of water hammer due to the sudden stop of the striking piston, then goes back down immediately, if the ground is soft , but stays raised a little longer if the ground is hard.
  • the drawer 23 eliminates the influence of pressure variations in the upper chamber 8, by letting the fluid flow towards the selector 13 only a little later, when the lifting of the drawer 15 corresponds effectively to the presence of a flow installed from the upper chamber 8 to the channel 5, and therefore, to a rebound of the piston on hard ground.
  • the calibrated orifice contained in the channel 28 evacuates towards the low pressure circuit 6, all the fluid coming from the spool 15 and the channel 16
  • the channel 18 no longer receives fluid, but on the contrary discharges through the channel 28 the fluid contained in the control chamber of the drawer 13, allowing the striking piston to be kept in small stroke.
  • FIG. 4 represents a variant of the invention according to which the distributor 4 and the drawer 23 form only one piece.
  • the channel 28 is eliminated and replaced by a channel 29 or a channel 30 comprising a calibrated orifice and connecting the channel 18 with the low pressure circuit 6.
  • the drawer 13 is pushed upwards, so as to select the large stroke of the striking piston.
  • FIG. 5 represents another embodiment of the invention, in which the drawer 15 is constituted by a valve, or valve, allowing energy recovery.
  • this valve specially fitted out according to the invention, comprises a groove 15a making it possible to connect the channel 14, supplied with high pressure, with the channel 16, at the time of its lifting.
  • the piston 1 delivers the fluid contained in the upper chamber 8, directly through the passage 25, then the channel 26 towards the high pressure circuit 5, by lifting the valve 15.
  • the valve 15 remains raised as long as the pressure drop due to the flow between the channels 25 and 26 is greater than the value of the supply pressure multiplied by a constant depending on the sections of the valve.
  • the supply pressure being kept constant moreover, the valve 15 therefore remains open from a flow rate intended for evacuation of the upper chamber 8.
  • the groove of the valve places the channel 14 in communication with the channel 16. This allows, through the passage of fluid through the slide 23, to supply the channel 18 and therefore to control the stroke selector 13 so as to obtain a large stroke for striking the piston for hard ground.
  • FIG. 6 represents another embodiment of the invention, according to which the channel 14 is replaced by a channel 27 in communication with the upper chamber 8.
  • the channel 14 is replaced by a channel 27 in communication with the upper chamber 8.
  • the upper house is obviously under pressure.
  • the fluid supply can therefore be taken in the upper chamber 8 instead of being taken as previously by the inlet channel 5.
  • the invention provides an improvement and a simplification to the current state of the art in the field of automatic selection of the striking stroke of these devices.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Presses And Accessory Devices Thereof (AREA)
EP95420353A 1994-12-08 1995-12-06 Verfahren und Vorrichtung zum Einstellen des Schlaghubes einer, von einem inkompressiblen Fluid angetriebenen, Schlagvorrichtung Expired - Lifetime EP0715932B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9415020A FR2727891B1 (fr) 1994-12-08 1994-12-08 Procede et appareil pour la regulation de la course de frappe d'un appareil a percussion mu par un fluide incompressible sous pression
FR9415020 1994-12-08

Publications (2)

Publication Number Publication Date
EP0715932A1 true EP0715932A1 (de) 1996-06-12
EP0715932B1 EP0715932B1 (de) 2001-11-14

Family

ID=9469776

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Application Number Title Priority Date Filing Date
EP95420353A Expired - Lifetime EP0715932B1 (de) 1994-12-08 1995-12-06 Verfahren und Vorrichtung zum Einstellen des Schlaghubes einer, von einem inkompressiblen Fluid angetriebenen, Schlagvorrichtung

Country Status (13)

Country Link
US (1) US5669281A (de)
EP (1) EP0715932B1 (de)
JP (1) JP3713320B2 (de)
KR (1) KR100427450B1 (de)
AT (1) ATE208688T1 (de)
AU (1) AU695964B2 (de)
CA (1) CA2163582C (de)
DE (1) DE69523867T2 (de)
ES (1) ES2166392T3 (de)
FI (1) FI955881A (de)
FR (1) FR2727891B1 (de)
NO (1) NO306934B1 (de)
ZA (1) ZA9510110B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083903A1 (fr) 2011-12-09 2013-06-13 Montabert Procédé de commutation de la course de frappe d'un piston de frappe d'un appareil à percussions

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2811601B1 (fr) * 2000-07-13 2002-10-11 Montabert Ets Appareil hydraulique a percussions
US6491114B1 (en) 2000-10-03 2002-12-10 Npk Construction Equipment, Inc. Slow start control for a hydraulic hammer
KR100569198B1 (ko) * 2003-05-06 2006-04-07 이일재 유압타격장치
US7219955B2 (en) * 2005-02-18 2007-05-22 Atico Int Usa Inc Anti-pinching device for use in a folding chair
FR2902684B1 (fr) * 2006-06-27 2010-02-26 Montabert Roger Procede de commutation de la course de frappe d'un appareil a percussions mu par un fluide incompressible sous pression, et appareil pour la mise en oeuvre de ce procede
SE530885C2 (sv) * 2007-02-23 2008-10-07 Atlas Copco Rock Drills Ab Förfarande vid slagverk, slagverk och bergborrmaskin
US8770457B2 (en) * 2008-12-24 2014-07-08 Globalforce Ip Limited Actuation system
CN101927479B (zh) * 2009-06-23 2014-10-22 蒙塔博特公司 液压冲击设备
CN101927478B (zh) * 2009-06-23 2015-03-04 蒙塔博特公司 液压冲击设备
SE535801C2 (sv) 2011-04-27 2012-12-27 Atlas Copco Rock Drills Ab Slagverk, bergborrmaskin och borrigg
DE102012012297A1 (de) * 2012-03-30 2013-10-02 Atlas Copco Construction Tools Gmbh Ventil
FR3027543B1 (fr) * 2014-10-28 2016-12-23 Montabert Roger Appareil a percussions
US9840000B2 (en) 2014-12-17 2017-12-12 Caterpillar Inc. Hydraulic hammer having variable stroke control
US20160221171A1 (en) * 2015-02-02 2016-08-04 Caterpillar Inc. Hydraulic hammer having dual valve acceleration control system
FR3077753B1 (fr) * 2018-02-14 2020-01-31 Montabert Procede de reglage de la course de frappe d’un piston de frappe d’un appareil a percussions, et un appareil a percussions pour la mise en œuvre de ce procede

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080446A2 (de) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Schlagwerkzeug und Steuerverfahren dafür
EP0214064A1 (de) 1985-07-16 1987-03-11 Etablissements Montabert Verfahren und Vorrichtung zum Steuern der Bewegung des Schlagkolbens einer von einem nichtzusammendrückbaren Fluidum angetriebenen Schlagvorrichtung
EP0256955A1 (de) 1986-08-07 1988-02-24 Etablissements Montabert Verfahren und Vorrichtung zum Einstellen der Schlagparameter des Schlagkolbens einer von einem nicht zusammendrückbaren Fluid angetriebenen Vorrichtung
EP0300929A1 (de) * 1987-07-17 1989-01-25 Etablissements Montabert Hydraulischer Verteiler für eine Schlagvorrichtung
DE4019016A1 (de) * 1990-06-14 1991-06-13 Krupp Maschinentechnik Verfahren zur beeinflussung des betriebsverhaltens eines schlagwerks und einrichtung zur durchfuehrung des verfahrens

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1703061C3 (de) * 1968-03-27 1974-02-14 Fried. Krupp Gmbh, 4300 Essen Hydraulisch betriebener Schubkolbenmotor
US3720137A (en) * 1971-05-24 1973-03-13 Milwaukee Cylinder Corp Automatically reversing, double acting fluid cylinder mechanism
US4016941A (en) * 1973-03-08 1977-04-12 Sanders William H Hand-size fluid-powered tool reciprocator
EP0236721A3 (de) * 1986-03-11 1989-10-25 NITTETSU JITSUGYO CO., Ltd. Hydraulischer Brecher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0080446A2 (de) * 1981-11-20 1983-06-01 Atlas Copco Aktiebolag Schlagwerkzeug und Steuerverfahren dafür
EP0214064A1 (de) 1985-07-16 1987-03-11 Etablissements Montabert Verfahren und Vorrichtung zum Steuern der Bewegung des Schlagkolbens einer von einem nichtzusammendrückbaren Fluidum angetriebenen Schlagvorrichtung
EP0256955A1 (de) 1986-08-07 1988-02-24 Etablissements Montabert Verfahren und Vorrichtung zum Einstellen der Schlagparameter des Schlagkolbens einer von einem nicht zusammendrückbaren Fluid angetriebenen Vorrichtung
EP0300929A1 (de) * 1987-07-17 1989-01-25 Etablissements Montabert Hydraulischer Verteiler für eine Schlagvorrichtung
DE4019016A1 (de) * 1990-06-14 1991-06-13 Krupp Maschinentechnik Verfahren zur beeinflussung des betriebsverhaltens eines schlagwerks und einrichtung zur durchfuehrung des verfahrens

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083903A1 (fr) 2011-12-09 2013-06-13 Montabert Procédé de commutation de la course de frappe d'un piston de frappe d'un appareil à percussions
US9981371B2 (en) 2011-12-09 2018-05-29 Montabert Method for switching the striking stroke of a striking piston of a percussion device

Also Published As

Publication number Publication date
AU695964B2 (en) 1998-08-27
NO306934B1 (no) 2000-01-17
FI955881A0 (fi) 1995-12-07
KR100427450B1 (ko) 2004-07-16
NO954971L (no) 1996-06-10
KR960021401A (ko) 1996-07-18
FI955881A (fi) 1996-06-09
EP0715932B1 (de) 2001-11-14
NO954971D0 (no) 1995-12-07
AU4027595A (en) 1996-06-13
ATE208688T1 (de) 2001-11-15
CA2163582A1 (fr) 1996-06-09
US5669281A (en) 1997-09-23
CA2163582C (fr) 2006-04-04
JPH08216051A (ja) 1996-08-27
ES2166392T3 (es) 2002-04-16
DE69523867T2 (de) 2002-04-18
ZA9510110B (en) 1996-06-06
JP3713320B2 (ja) 2005-11-09
FR2727891B1 (fr) 1997-01-24
FR2727891A1 (fr) 1996-06-14
DE69523867D1 (de) 2001-12-20

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