EP3752325A1 - Perforateur hydraulique roto-percutant pourvu d'une chambre de commande reliée en permanence à un accumulateur basse pression - Google Patents
Perforateur hydraulique roto-percutant pourvu d'une chambre de commande reliée en permanence à un accumulateur basse pressionInfo
- Publication number
- EP3752325A1 EP3752325A1 EP19705982.7A EP19705982A EP3752325A1 EP 3752325 A1 EP3752325 A1 EP 3752325A1 EP 19705982 A EP19705982 A EP 19705982A EP 3752325 A1 EP3752325 A1 EP 3752325A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- control chamber
- stop piston
- roto
- pressure fluid
- 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
Links
- 239000012530 fluid Substances 0.000 claims abstract description 64
- 238000009527 percussion Methods 0.000 claims description 42
- 238000006073 displacement reaction Methods 0.000 claims description 14
- 230000003042 antagnostic effect Effects 0.000 claims description 4
- 239000011435 rock Substances 0.000 description 13
- 239000012528 membrane Substances 0.000 description 8
- 238000005553 drilling Methods 0.000 description 6
- 230000035515 penetration Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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
- B25D9/14—Control devices for the reciprocating piston
- B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/24—Damping the reaction force
- B25D17/245—Damping the reaction force using a fluid
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B6/00—Drives for drilling with combined rotary and percussive action
- E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
- E21B6/04—Separate drives for percussion and rotation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2209/00—Details of portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
- B25D2209/002—Pressure accumulators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0019—Guide-sleeves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
- B25D2217/0011—Details of anvils, guide-sleeves or pistons
- B25D2217/0023—Pistons
Definitions
- the present invention relates to a rotary-percussive hydraulic drill more specifically used on a drilling rig.
- a drilling rig comprises, in known manner, a roto-percussion hydraulic perforator slidably mounted on a slideway and driving one or more drillbars, the last of these drillbars carrying a tool called a cutter which in contact with the rock.
- a perforator generally aims to drill more or less deep holes in order to place explosive charges.
- the perforator is therefore the main element of a drilling rig which, on the one hand, confers on the cutter the rotation and the percussion through the drill bars so as to penetrate the rock, and on the other hand, provides an injection fluid so as to extract debris from the drilled hole.
- a roto-percussive hydraulic perforator more particularly comprises firstly a striking system which is driven by one or more hydraulic fluid flow rates from a main hydraulic supply circuit and which comprises a striking piston configured to strike, to each cycle of operation of the perforator, a fitting coupled to the drill bars, and secondly a rotation system provided with a hydraulic rotary motor and configured to rotate the fitting and the drill bars.
- the support force of the roto-percussion hydraulic perforator on the drill bars, and thus the cutting edge on the rock, is generated by the slide, thanks to a cable or a drive chain moved by a hydraulic jack or a hydraulic motor. More specifically, the bearing force is transmitted from the body of the perforator to the fitting via a stop element incorporated in the body of the perforator.
- This stop element can be constituted, for powerful perforators, a stop piston at least one surface is hydraulically supplied so as to ensure transmission of the support force by means of a fluid.
- Document WO2010 / 082871 discloses a roto-percussive hydraulic perforator in which, in operating conditions of the striking system, the stop piston is positioned in a position of equilibrium, conforming to a stroke. desired strike of the striking piston, via a hydraulic control chamber defined by the striking piston and the body of the perforator and permanently connected to a high pressure fluid supply conduit, the chamber of hydraulic control being configured on the one hand to urge the stop piston forward and on the other hand to be connected to a low-pressure fluid return duct when the rear face of the stop piston is located at a predetermined distance of the rear wall of the cavity receiving the stop piston.
- the present invention aims to remedy all or part of these disadvantages.
- the technical problem underlying the invention is therefore to provide a hydraulic perforator which is simple and economical structure, while having improved performance.
- the present invention relates to a roto-percussion hydraulic punch comprising:
- a fitting intended to be coupled to at least one drill bar equipped with a tool
- a plunger slidably mounted inside the body along a strike axis and configured to hit the fitting
- a stop piston which is tubular and which is slidably mounted in a cavity of the body along an axis of displacement substantially parallel to the strike axis, the stop piston comprising a front face facing towards the fitting and intended to position the fitting into a predetermined equilibrium position with respect to the striking piston, and a rear face opposite the front face and facing a rear wall of the cavity, and a main hydraulic supply circuit configured to control an alternating sliding of the striking piston along the strike axis and to control a sliding of the stop piston along the axis of displacement, the main hydraulic supply circuit comprising a conduit high pressure fluid supply and a low pressure fluid return line,
- the body and the stop piston delimiting at least in part a first control chamber permanently connected to the high pressure fluid supply conduit and configured to bias the stop piston forward, i.e. towards the fitting and therefore opposite the rear wall of the cavity, the roto-percussion hydraulic perforator further comprising a connecting channel configured to fluidly connect the first control chamber to the low-pressure fluid return conduit when the rear face of the stop piston is located at a distance from the rear wall of the cavity which is greater than a predetermined value,
- the main hydraulic supply circuit further comprises a low pressure accumulator connected to the low pressure fluid return line, and in that the body and the stop piston further delimit at least a second chamber controller permanently connected to the low pressure accumulator and configured to bias the stop piston forward.
- Such a configuration of the second control chamber makes it possible, because of the permanent connection of the latter with the low-pressure accumulator, to ensure a high-speed movement of the stop piston forwardly when the rock breaks under the impact of the striking piston and that the fitting is suddenly free to advance. This makes it possible to quickly restore a normal bearing force of the drill bar tool on the rock, despite the movements due to the penetration of the drill bar into the ground and the various vibrations of the body of the drill.
- the particular configuration of the first control chamber and the connecting channel makes it possible to position the stop piston hydraulically in an approximately stable equilibrium position corresponding to an optimum strike stroke of the striking piston.
- the hydraulic perforator may further have one or more of the following features, taken alone or in combination.
- the low pressure accumulator is a membrane accumulator, such as a hydropneumatic accumulator.
- the membrane accumulator advantageously comprises a flexible membrane whose first face is subjected to the pressure of a compressible gas volume contained in the membrane accumulator and whose second face is subjected to the pressure of the fluid at low pressure coming from the fluid return duct at low pressure.
- the second control chamber is connected to the low pressure accumulator by a return channel.
- the stop piston comprises a first annular control surface extending transversely to the axis of displacement and delimiting at least in part the first control chamber and a second annular control surface. extending transversely to the axis of movement and at least partially defining the second control chamber, the second annular control surface having a surface greater than the surface of the first annular control surface.
- the first control chamber has a cross section smaller than the cross section of the second control chamber.
- each of the first and second annular control surfaces extends substantially perpendicular to the axis of displacement.
- the first annular control surface is closer to the front face of the stop piston than the second annular control surface.
- the body and the stop piston delimit at least in part further a third control chamber permanently connected to the low pressure fluid return conduit, the third control chamber being antagonistic at the first and second control chambers.
- the third control chamber is permanently connected to the low pressure accumulator. According to one embodiment of the invention, the third control chamber is configured to urge the stop piston backwards, that is to say towards the rear wall of the cavity and therefore opposite the 'fitting.
- the third control chamber is connected to the low-pressure fluid return conduit by a fluid communication channel provided with a calibrated orifice.
- the return channel comprises a nozzle comprising the calibrated orifice.
- the third control chamber has a cross section smaller than the cross section of the second control chamber.
- the stop piston comprises the connecting channel
- the connecting channel comprises a first end portion opening into the third control chamber and a second end portion opposite the first end portion and opening into an outer surface of the stop piston, the second end portion being adapted to be fluidly connected to the first control chamber when the rear face of the stop piston is located at a distance from the rear wall of the cavity greater than the predetermined value.
- the stop piston comprises the connecting channel.
- the connecting channel comprises a first end portion opening into the first control chamber and a second end portion opposite to the first end portion and opening into an outer surface of the stop piston, the second end portion of the connecting channel being adapted to be fluidly connected to the low pressure fluid return conduit when the rear face of the stop piston is located at a distance from the rear wall of the upper cavity at the predetermined value.
- the body comprises an annular groove opening into the cavity and permanently connected to the low-pressure fluid return conduit, the second end portion of the connecting channel being able to be fluidly connected. to the annular groove when the rear face of the stop piston is located at a distance from the rear wall of the cavity greater than the predetermined value.
- the annular groove is connected to the low pressure accumulator.
- the roto-percussion hydraulic perforator comprises a supply channel connecting the first control chamber to the high-pressure fluid supply conduit.
- the supply channel is provided with a calibrated orifice.
- the feed channel comprises a nozzle comprising the calibrated orifice.
- the stop piston is slidably mounted around the striking piston.
- the main hydraulic supply circuit comprises a high pressure accumulator connected to the high-pressure fluid supply duct.
- the high pressure accumulator is a membrane accumulator, such as a hydropneumatic accumulator.
- the membrane accumulator forming the high pressure accumulator advantageously comprises a flexible membrane whose first face is subjected to the pressure of a compressible gas volume contained in the membrane accumulator and whose second face is subjected to the pressure of the diaphragm. high pressure fluid from the high pressure fluid supply conduit.
- the roto-percussion hydraulic perforator further comprises an annular abutment member disposed between the fitting and the front face of the stop piston.
- the annular abutment member is an abutment ring.
- the roto-percussion hydraulic perforator comprises a thrust bearing disposed between the rear face of the stop piston and the rear wall of the cavity.
- the thrust bearing may for example be a rolling thrust bearing.
- the stop piston comprises an annular bearing surface configured to abut against an annular abutment surface of the body.
- the annular bearing surface is configured to abut against the annular abutment surface of the body when the rear face of the stop piston is located at a predetermined distance from the rear wall of the cavity, the predetermined distance being greater than the predetermined value.
- the annular bearing surface is inclined with respect to the axis of displacement.
- the stop piston comprises an annular collar comprising the annular bearing surface.
- the annular flange delimits at least in part the third control chamber.
- the annular collar comprises the first annular control surface.
- the body comprises a piston cylinder in which the striking piston is slidably mounted alternately, the cavity being formed in the body coaxially with the piston cylinder.
- the fitting extends longitudinally along the strike axis.
- the fitting comprises a first end portion facing the striking piston and provided with an end face against which is intended to strike the striking piston, and a second portion end, opposite the first end portion, to be coupled to the at least one drill bar.
- the high pressure fluid supply duct is a high pressure incompressible fluid supply duct
- the low pressure fluid return duct is a fluid return duct. incompressible at low pressure
- Figure 1 is a longitudinal sectional view of a rotopercutant hydraulic perforator according to a first embodiment of the invention.
- FIG. 2 is a longitudinal sectional view, on an enlarged scale, of a detail of FIG. 1.
- Figure 3 is a longitudinal sectional view of a rotopercutant hydraulic perforator according to a second embodiment of the invention.
- Figure 4 is a longitudinal sectional view of a rotopercutant hydraulic perforator according to a third embodiment of the invention.
- Figures 1 and 2 show a first embodiment of a rotopercutant hydraulic perforator 2 which is intended for the perforation of boreholes, and which is provided in particular with a striking system and a rotation system.
- the rotopercutting hydraulic perforator 2 more particularly comprises a body 3 comprising a piston cylinder 4.
- the body 1 comprises a main body 3.1 partially delimiting the piston cylinder 4, as well as a front jacket 3.2 and a rear jacket 3.3 mounted in force in a bore 3.4 delimited by the main body 3.1.
- the rotary percussion hydraulic hammer striking system 2 comprises a striking piston 5 alternatively slidably mounted in the piston cylinder 4 along a strike axis A.
- the striking piston 5 and the cylinder 4 define a primary control chamber 6 which is annular, and a secondary control chamber 7 which has a section larger than that of the primary control chamber 6 and which is antagonistic to the primary control chamber 6.
- the rotary percussion hydraulic hammer striking system 2 further comprises a control valve 8 arranged to control reciprocating movement of the striking piston 5 within the piston cylinder 4 alternately in a striking stroke and a return stroke.
- the control distributor 8 is configured to put the secondary control chamber 7, alternatively in connection with a high-pressure fluid supply duct 9, such as a high-pressure incompressible fluid supply duct, during the stroke stroke of the striking piston 5, and with a low-pressure fluid return conduit 11, such as a low pressure incompressible fluid return conduit, during the return stroke of the striking piston 5.
- the conduit high-pressure fluid supply 9 and the low-pressure fluid return line 11 belong to a main hydraulic supply circuit which is provided with the striking system.
- the main hydraulic supply circuit may advantageously comprise a high-pressure accumulator 12 connected to the high-pressure fluid supply duct 9.
- the control distributor 8 is more particularly mounted to move in a bore formed in the body 3 between a first position (see FIG. 2) in which the control distributor 8 is configured to put the secondary control chamber 7 in relation with the conduit. fluid supply at high pressure 9 and a second position in which the control valve 8 is configured to put the secondary control chamber 7 in relation with the low pressure fluid return conduit 11.
- the primary control chamber 6 is advantageously permanently supplied with high-pressure fluid by a feed channel (not shown in the figures), so that each position of the control valve 8 causes the stroke stroke of the piston of hit 5, then the return stroke of the punch piston 5.
- the rotary percussion hydraulic hammer striking system 2 also comprises a thrust piston 13 which is tubular and which is slidably mounted in a cavity 14 of the body 3 along an axis of displacement parallel to the strike axis A and preferably coincides with the A striking pin A.
- the stop piston 13 is slidably mounted around the striking piston 5, and the cavity 14 is formed in the body 3 coaxially with the piston cylinder 4 .
- the rotopercutant hydraulic perforator 2 further comprises a fitting 15 intended to be coupled, in known manner, to at least one drilling bar (not shown in the figures) equipped with a tool.
- the fitting 15 extends longitudinally along the strike axis A, and has a first end portion 16 facing the striking piston 5 and provided with an end face 17 against which is intended to strike the piston. 5 during each cycle of operation of the rotating hydraulic perforator 2, and a second end portion (not shown in the figures), opposite the first end portion 16, to be coupled to the at least one a drill bar.
- the stop piston 13 having a front face 18 facing the fitting 15 and intended to position the fitting 15 in a predetermined equilibrium position relative to the striking piston 5, and a rear face 19 opposite the front face 18 and located facing a rear wall 21 of the cavity 14.
- the body 3 and the stop piston 13 delimit, with the striking piston 5, a first control chamber 22 permanently connected to the high pressure fluid supply conduit 9 and configured to urge the stop piston 13 towards the before, that is to say towards the fitting 15 and therefore opposite the rear wall 21 of the cavity 14.
- the roto-percussion hydraulic punch 2 advantageously comprises a feed channel 23 connecting the first chamber 22 to the high-pressure fluid supply conduit 9.
- the feed channel 23 is provided with a calibrated orifice 24, which may for example be provided on a nozzle incorporated in the feed channel 23.
- the body 3 and the stop piston 13 delimit, with the striking piston 5, also a second control chamber 25 connected to a low pressure accumulator 26 which belongs to the main hydraulic power supply system of the striking system and which is connected to the low pressure fluid return conduit 11.
- the second control chamber 25 is, like the first control chamber 22, also configured to bias the stop piston 13 forward.
- the roto-percussion hydraulic perforator 2 comprises a return channel 27 connecting the second control chamber 25 to the low-pressure accumulator 26.
- the stop piston 13 comprises a first annular control surface 28, also called first annular active surface, extending perpendicularly to the axis of displacement and partially delimiting the first control chamber 22, and a second annular control surface 29, also called second annular active surface, extending perpendicularly to the axis of displacement and partially delimiting the second control chamber 25.
- the second annular control surface 29 presents advantageously an upper surface than the surface of the first annular control surface 28.
- the second control chamber 25 advantageously has a cross section greater than the cross section of the first control chamber 22.
- the body 3 and the stop piston 15 also delimit a third control chamber 31 permanently connected to the low-pressure fluid return duct 11, via a fluid communication channel 32 opening into the third chamber.
- control 31 and the return channel 27 which connects the fluidic communication channel 32 to the low pressure fluid return conduit 11.
- the third control chamber 31 is antagonistic to the first and second control chambers 22, 25, and is thus configured to urge the stop piston 13 backwards.
- the second control chamber 25 is dimensioned to have an active surface on the stop piston 13 much larger than the active surface of the third control chamber 31.
- the second and third control chambers 25, 31 being connected to the channel of return 27 and to the low pressure accumulator 26, calculating the difference of the two active surfaces of the second and third control chambers 25, 31 gives a resultant active surface pushing the stop piston 13 forward and subjected to pressure of the low pressure accumulator 26.
- the roto-percussive hydraulic perforator 2 further comprises a connecting channel 33 configured to fluidically connect the first control chamber 22 to the low-pressure fluid return conduit 11 when the rear face 19 of the stop piston 13 is located at a distance of the rear wall 21 of the cavity 14 which is greater than a predetermined value.
- the stop piston 13 comprises the connecting channel 33
- the connecting channel 33 comprises a first end portion 33.1 opening into the first control chamber 22 and a second end portion 33.2 opposite the first end portion 33.1 and opening into an outer surface of the stop piston 13.
- the second end portion 33.2 of the connecting channel 33 is adapted to be fluidly connected to a groove annular 34, which opens into the cavity 14 and which is permanently connected to the low-pressure fluid return duct 11, when the rear face 19 of the stop piston 13 is located at a distance from the rear wall 21 of the cavity 14 which is greater than the predetermined value.
- the stop piston 13, which is subjected, by the rock, to a force responsive to the thrust force exerted by the rotary-percussive hydraulic perforator 2 ceases to advance, and finds an equilibrium position on the edge of the outlet of the connecting channel 33 in the Annular groove 34.
- this equilibrium position makes it possible to locate the fitting 15 at a distance from the striking piston 5 which corresponds to a striking stroke C provided for the striking piston 5.
- the calibrated orifice 24 is advantageously t of very small dimension relative to the connecting channel 33 and the return channel 27 so that the pressure that is established in the first control chamber 22 drops very rapidly when the connecting channel 33 opens in the annular groove 34.
- the flow rate passing through the calibrated orifice 24 should preferably remain low since it is taken from the high-pressure fluid supply duct 9. As described above, the flow rate of fluid supplying the first control chamber 22 is low, and therefore, the speed of displacement of the stop piston 13, resulting from this flow of fluid, is also low.
- the second control chamber 25 is freely powered by the low-pressure accumulator 26, and will make it possible to push the stop piston 13 forward and at high speed, for example when the rock gives way under the impact of the striking piston 5 and that the fitting 15 is suddenly free to advance.
- This makes it possible to quickly restore a normal support force of the tool of the drill bar on the rock, despite the movements due to the penetration of the drill bar into the ground and the various vibrations of the body 3 of the drill, all by providing, through the first control chamber 22, an average position of the stop piston 13 which respects the strike stroke C provided for the striking piston 5.
- the roto-percussion hydraulic perforator 2 also comprises a rotation system comprising a hydraulic motor 35 driving a driving pinion 36 and a pinion receiver 37, so as to ensure a rotational movement of the fitting 15.
- the hydraulic motor 35 is advantageously powered hydraulically by an external hydraulic supply circuit.
- the fitting 15 When the roto-percussion hydraulic perforator 2 is in operation, the fitting 15 is rotated by the hydraulic motor 35, and the fitting 15 receives on its end face 17 the cyclical impacts of the striking piston 5, provided by the striking system powered by the main hydraulic supply circuit.
- the carrier on which is mounted roto-percussion hydraulic perforator 2 applies a thrust force on the drill bar via the body 3 of the rotary percussion hydraulic punch 2 and the fitting 15.
- a l inside the perforator, between the body 3 and the fitting 15, this force is transmitted via the stop piston 13 and an abutment member 38, such as an abutment ring, disposed between the fitting 15 and the front face 18 of the stop piston 13.
- the positioning of the stop piston 13 is thus purely hydraulic and is arranged so that the strike stroke C of the striking piston 5 is respected.
- the stop piston 13 further comprises an annular bearing surface 39 configured to abut against an annular abutment surface 41 of the body 3, so as to limit the displacement path of the stop piston 13 towards the front, c That is, towards the fitting 15.
- the annular abutment surface 39 is configured to abut against the annular abutment surface 41 of the body 3 when the rear face 19 of the abutment piston 13 is located at a predetermined distance from the rear wall 21 of the cavity 14, the predetermined distance being greater than the predetermined value.
- the annular bearing surface 39 is inclined with respect to the axis of displacement, and partly delimits the third control chamber 31.
- FIG. 3 shows a second embodiment of the rotopercutant hydraulic perforator 2 which differs from the first embodiment essentially in that the fluidic communication channel 32 is provided with a calibrated orifice 42, which may for example be provided on an incorporated nozzle the fluidic communication channel 32, and in that the first end portion 33.1 of the connecting channel 33 opens into the third control chamber 31 and the second end portion 33.2 of the connecting channel 33 opens into an outer surface of the stop piston 13, the second end portion 33.2 of the connecting channel 33 being adapted to be fluidly connected to the first control chamber 22 when the rear face 19 of the stop piston 13 is located at a distance from the rear wall 21 of the cavity 14 which is greater than the predetermined value.
- the first control chamber 22 is subjected to the high pressure, the stop piston 13 moves forward until that the second end portion 33.2 of the connecting channel 33 opens into the first control chamber 22.
- the high pressure oil then flows into the third control chamber 31 whose connection with the return channel 27 is throttled by the calibrated orifice 42.
- the first and third control chambers 22, 31 then take rather close pressures, which reduces or cancels the forward thrust of the stop piston 13.
- the thrust piston 13 will find a stable operating position around this position of the second end portion 33.2 of the connecting channel 33.
- the second control chamber 25 is freely powered by the low pressure accumulator 26, and will allow to push forward and at high speed the abutment piston 13, for example when the rock gives way under the impact of the striking piston 5.
- This makes it possible to quickly return to a normal support force of the tool of the drill bar on the rock, despite the movements due to the penetration of the bar drilling in the field and the various vibrations of the body 3 of the perforator, while ensuring, thanks to the first and third control chambers 22, 31, an average position of the stop piston 13 which respects the strike stroke C of the striking piston 5.
- the stop piston 13 comprises an annular collar 43, also called annular shoulder, which comprises the annular support surface 39 and the first annular control surface 28.
- the annular flange 43 advantageously delimits in part the first control chamber 22 and in part the third control chamber 31.
- the feed channel 23 is advantageously devoid of calibrated orifice, or any other specific throttling element.
- FIG. 4 shows a third embodiment of the rotopercutant hydraulic perforator 2 which differs from the first embodiment essentially in that the roto-percussion hydraulic perforator 2 comprises a thrust bearing 44, such as a roller thrust bearing, arranged between the rear face 19 of the stop piston 13 and the rear wall 21 of the cavity 14.
- a thrust bearing 44 such as a roller thrust bearing
- the stop piston 13 is pressed, by the reaction force of the ground, against not the rear wall 21 of the cavity 14 (which could induce rotational friction of the stop piston 13 against the body 3 and thus to generate damage to different parts constituting the perforator), but against the thrust bearing 44 (which greatly limits the wear of the roto-percussion hydraulic perforator 2, and without the addition of external fluid to the caliper of the stop piston 13).
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Automation & Control Theory (AREA)
- Earth Drilling (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1851249A FR3077752B1 (fr) | 2018-02-14 | 2018-02-14 | Perforateur hydraulique roto-percutant pourvu d’une chambre de commande reliee en permanence a un accumulateur basse pression |
PCT/FR2019/050089 WO2019158834A1 (fr) | 2018-02-14 | 2019-01-16 | Perforateur hydraulique roto-percutant pourvu d'une chambre de commande reliée en permanence à un accumulateur basse pression |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3752325A1 true EP3752325A1 (fr) | 2020-12-23 |
EP3752325B1 EP3752325B1 (fr) | 2022-03-09 |
Family
ID=61913427
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19705982.7A Active EP3752325B1 (fr) | 2018-02-14 | 2019-01-16 | Perforateur hydraulique roto-percutant pourvu d'une chambre de commande reliée en permanence à un accumulateur basse pression |
Country Status (10)
Country | Link |
---|---|
US (1) | US11724379B2 (fr) |
EP (1) | EP3752325B1 (fr) |
JP (1) | JP2021513464A (fr) |
KR (1) | KR20200120671A (fr) |
CN (1) | CN111712353B (fr) |
AU (1) | AU2019221107B2 (fr) |
CA (1) | CA3088119C (fr) |
FR (1) | FR3077752B1 (fr) |
WO (1) | WO2019158834A1 (fr) |
ZA (1) | ZA202005522B (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
FR3108931B1 (fr) * | 2020-04-02 | 2022-04-08 | Montabert Roger | Perforateur hydraulique roto-percutant pourvu d’un emmanchement équipé de cannelures d’accouplement |
FR3120247B1 (fr) | 2021-03-01 | 2023-09-29 | Montabert Roger | Perforateur hydraulique roto-percutant pourvu d’un piston de butée |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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SE8106907L (sv) * | 1981-11-20 | 1983-05-21 | Atlas Copco Ab | Sett att styra ett slagverk och slagverk |
SE508064C2 (sv) * | 1993-10-15 | 1998-08-17 | Atlas Copco Rock Drills Ab | Bergborrningsanordning med reflexdämpare |
FR2837523B1 (fr) * | 2002-03-19 | 2004-05-14 | Montabert Sa | Marteau perforateur hydraulique roto-percutant |
SE533344C2 (sv) * | 2009-01-16 | 2010-08-31 | Atlas Copco Rock Drills Ab | Dämpningsanordning för slagverk, slagverk och borrmaskin |
CN101927478B (zh) * | 2009-06-23 | 2015-03-04 | 蒙塔博特公司 | 液压冲击设备 |
FR3027543B1 (fr) * | 2014-10-28 | 2016-12-23 | Montabert Roger | Appareil a percussions |
-
2018
- 2018-02-14 FR FR1851249A patent/FR3077752B1/fr not_active Expired - Fee Related
-
2019
- 2019-01-16 CN CN201980011795.7A patent/CN111712353B/zh active Active
- 2019-01-16 JP JP2020540771A patent/JP2021513464A/ja active Pending
- 2019-01-16 AU AU2019221107A patent/AU2019221107B2/en active Active
- 2019-01-16 US US16/969,806 patent/US11724379B2/en active Active
- 2019-01-16 WO PCT/FR2019/050089 patent/WO2019158834A1/fr unknown
- 2019-01-16 KR KR1020207025775A patent/KR20200120671A/ko unknown
- 2019-01-16 EP EP19705982.7A patent/EP3752325B1/fr active Active
- 2019-01-16 CA CA3088119A patent/CA3088119C/fr active Active
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2020
- 2020-09-04 ZA ZA2020/05522A patent/ZA202005522B/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN111712353B (zh) | 2023-03-21 |
EP3752325B1 (fr) | 2022-03-09 |
US20210001462A1 (en) | 2021-01-07 |
FR3077752B1 (fr) | 2020-01-31 |
FR3077752A1 (fr) | 2019-08-16 |
CA3088119C (fr) | 2024-04-23 |
KR20200120671A (ko) | 2020-10-21 |
CN111712353A (zh) | 2020-09-25 |
JP2021513464A (ja) | 2021-05-27 |
AU2019221107B2 (en) | 2024-04-04 |
US11724379B2 (en) | 2023-08-15 |
WO2019158834A1 (fr) | 2019-08-22 |
AU2019221107A1 (en) | 2020-07-30 |
ZA202005522B (en) | 2021-08-25 |
CA3088119A1 (fr) | 2019-08-22 |
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