• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:SE1050986A1
    申请号:SE1050986
    申请日:2009-03-09
    公开日:2010-09-23
    发明作者:Jean-Sylvain Comarmond
    申请人:Montabert Ets；
    IPC主号:
    专利说明:

    1020253035402a device for controlling the shaft,a fluid injection circuit designed to conduct fluid for injectionspraying from a fluid supply line to the tool and to the rock-formingtion in which drilling is to be carried out, in order to remove the rock drilling cuttings during drillingfrom a borehole, the injection liquid being intended to be in contact withthe control device and the shaft,characterized in that it comprises at least one anode arranged in thethe fluid injection circuit and is intended to be in contact with the injectionthe anode liquid, the anode being arranged to provide a cathodic protectionfor the metal surfaces on the control device and / or on the shaft against a corrosive attackcaused by the injection fluid.
    The cathodic protection is a known technique for controlling corrosionof metallic surfaces by converting these surfaces into cathodes in an electrochemicalcell, the injection liquid forming the electrolyte in the electrochemical cell.
    As the injection liquid contains corrosive substances, it thus interactsthe latter with the anode provided in the liquid injection circuitka, and corrodes the anode instead of the metal surfaces of the control device and / orthe shaft, so that the corrosion rate of the control device and / or the shaft appearsdecrease significantly.
    This results in less frequent replacements of the control device and / orof the shaft, and thus entails a reduction in the time required for interruptions in workat the workplace.
    According to an embodiment of the invention, the anode is placed in a recess.ring designed in the control device.
    Preferably, the recess opens towards the environment of the control device,the percussion drill comprising means for retaining the anode in the recessone.
    Advantageously, the control device limits a substantially ring-shapedshaped chamber around the shaft, in which the injection liquid is intended to flowma, the substantially annular chamber forming the recess in whichthe anode is arranged, and the shaft has an internal injection channel whichopens into the annular chamber.
    According to another embodiment of the invention, the anode is arranged in acapsule separate from the guide device and from the shaft.
    Preferably, a first outer portion of the capsule containing the anode isconnected to the supply line for liquid.
    Advantageously, a second outer part of the capsule containsthe anode connected to the control device or to the body of the percussion drill.
    According to an embodiment of the invention, the anode is in electrical continuitywith the control device and / or the shaft.10202530353According to another embodiment of the invention, the anode is made ofa material that has a potential more electronegative than the potential of the materialmaterial used to make the steering and / or shaft.
    According to yet another embodiment of the invention, the anode andthe control device electrically connected to a direct current generator arranged toon an electric current between the anode and the control device.
    In any case, the invention is explained in more detail by means of the followingdescription with reference to the accompanying schematic drawing which, inillustrative, non-limiting examples illustrate a number of embodiments thereofhydraulic percussion drill with rotary impact pressure effect.
    Figure 1 is a longitudinal sectional view of the percussion drill according to a firstembodiment of the invention.
    Figure 2 is a longitudinal sectional view of the percussion drill according to a secondembodiment of the invention.
    Figure 3 is a longitudinal sectional view of the percussion drill according to a thirdembodiment of the invention.
    Figure 4 is a longitudinal sectional view of the percussion drill according to a fourthembodiment of the invention.
    Figure 5 is a longitudinal sectional view of the percussion drill according to a fifthembodiment of the invention.
    Referring to Figure 1, a percussion drill 1 according to the invention comprisesa percussion mechanism consisting of a percussion piston 2 arranged in a bore 3 formedformed in the body 4 of the percussion drill 4, and by a hydraulic distribution system 5which is fed from a pressure circuit 6 and from a low pressure circuit 7, the hydraulicthe distribution system 5 allows the reciprocating movement of the percussion piston 2.
    The percussion drill 1 also comprises a rotation mechanism comprisingtakes a hydraulic motor 8 which rotatably drives a shaft 9 while transmitting gear 10and 11 arranged in the body of the percussion drill 4.
    The shaft 9 is connected to a drill rod 12 which, at the end which islocated opposite the shaft, carries a drill bit 13 in contact with a rock formation14 to be drilled. The shaft extends in the axis of the percussion piston 2 and the front surfaceof the latter 1 is intended to come into abutment against the shaft 9.
    The shaft 9 thus transmits the shock waves received from the percussion piston2, and the rotational movement to the drill rod 12 and to the drill bit 13, to performdrilling in the rock formation 14.
    The waste generated by this drilling in the rock formation 14 isis guided as the drill bit is advanced during injection of an injectionliquid. This injection liquid generally comes from a water reserve locatednear the workplace. This water is pressurized and led into1020253035404a supply line for liquid 15 to a control device 16 in the shaft 12, wherein the control devicethe arrangement 16 is attached to the front part of the body 4 of the percussion drill device 1.
    The guide device 16 comprises a bore 17 through which the shaft 9extends. The guide device 16 defines an annular chamber 18 all aroundshaft 9, into which opens a connecting channel 19, which is arranged in the control device.16 and communicates with the supply line for liquid 15. The annularThe chamber 18 has been sealed by means of two annular seals 20arranged between the guide device 16 and the shaft 9 on either side of the ringshaped chamber 18.
    The shaft 9 comprises an axial channel 21 which extends over a part ofits length, the axial channel 21 opening into the annular chamber 18and communicates with an axial channel 22 arranged in the drill rod 9. The axialthe channel 22 extends all the way to the drill bit 13 so that the injection liquid isfrom the feed line 15 to the rock formation 14 and is able to remove drillingcaxet.
    The percussion drill 1 comprises a sacrificial anode 23, i.e. an anode madein a material used to make the guide device 16 and the shaft9. The anode 23 is tubular and is arranged in a space formed in the control device-a 16, the space opening towards the outside of the control device. The anode 23 can bebe made of alloys of zinc, of magnesium and of aluminum.
    It should be noted that the anode 23 restricts part of the passage in connectionchannel 19, so that the injection liquid flows across the anode 23 beforeit is reassembled with the axial channels 21, 22 in the shaft 9 and in the drill rod 12.
    In addition, the anode 23 is in electrical continuity with the control device 16 and the shaft9.
    The percussion drill 1 comprises means for retaining the anode 23 inthe space provided in the control device 16. The means of retention includemakes an insert 24 that includes a first external thread that cooperates withan internal thread arranged in the space receiving the anode, and a secondexternal threading which cooperates with a threaded part of the supply line forspray liquid 15.
    During operation, the fluid containing corrosive substances flows from thefluid line 15 up to the drill bit 13 and comes into contact with the guidethe device 16 and the shaft 9 so that the fluid forms the electrolyte in an electrochemicalcell, the control device 16 and the shaft 9 forming a cathode in such an electrodemisk cell.
    This results in a degradation by corrosion of the anode 23 insteadfor the metallic surfaces of the guide device 16 and the shaft 9.
    It should be noted that the positioning of the anode 23 in a space such asopening towards the outside allows an easy replacement of the anode 23 when the decomposition ofthe same has happened. Namely, it is enough to unscrew the insert 24, to replacethe spent anode 23 with a new anode, and finally to screw in again thethe kit 24 in the control device 16.1020253035405Figure 2 shows a second embodiment of the percussion drill 1 which differsdiffers from that shown in Figure 1 essentially in that the anode 23 has been replaced byone or more sacrificial anodes 25 arranged in the annular chamber 18 between twoseals 20. These anodes 25 can have different shapes and, for example, be tubularor exist in the form of rods.
    According to this second embodiment, the anodes 25 are as close as possiblepossible adjacent to the parts to be protected against corrosion, i.e. as close as possibleadjacent the guide device 16 and the shaft 9, which improves the cathodic protection ofthese parts.
    Figure 3 shows a third embodiment of the percussion drill 1 which separatesdiffers from that shown in Figure 1 in that the sacrificial anode 26 isarranged in an anode carrier tube 27, separated from the guide device 16 and the shaft 9. It shouldit is noted, however, that the anode 26 remains in electrical contact with the control device 16conveying a metallic or flexible insert with metallic gasket 28 whichis screwed onto the guide device 16 and to which a first outer end is screwedof the anode support tube 27. The other outer end of the anode support tube 27 is attached to theinjection line for injection fluid 15.
    In this configuration, it is sufficient that, when the anode 26 is consumed,replace the group anode 26 / anode carrier tube 27, without having to interfere with the controlscheme 16.
    Figure 4 shows a fourth embodiment of the percussion drill 1 which differsdiffers from that shown in Figure 3 essentially in that the anode carrier tube 27 isattached to the body 4 of the percussion drill, and by introducing the injection liquid directly intothe axial channel 21 in the shaft 9, the intermediate transmission of an injection pipe 29 whichis mechanically attached to the rear of the impact drill body 4. This injection pipe 29is mechanically connected and in electrical continuity with the anode carrier tube 27 and the anodethe 26. The anode 26 is also in electrical continuity with the body 4 of the percussion drill,the control device 16 and the shaft 9. The supply line for injection liquid 15, usedclosed to the anode carrier tube 27, feeds with the injection liquid the shaft 9 which is protectedagainst corrosion by the presence of the anode 26.
    Figure 5 shows a fifth embodiment of the percussion drill 1 which separatesfrom that shown in Figure 3 essentially in that the anode 30 andthe arrangement 16 are electrically connected to a direct current generator 31 provided forto apply an electric current between the anode 30 and the control device 16. GenerationThe positive and negative poles of the tower are connected to the anode 30 and to, respectivelythe control device 16. In this case, the anode 30 is electrically isolated from the metal mass icontrol device 16 and in the shaft 9, so as not to short-circuit the generator 31. This con-figuration makes it possible, even if it is more complex, to increase the efficiency ofthe anti-corrosion protection of the control device 16 and the shaft 9.
    It should be noted that it is possible to use a DC generatorpermanently or cyclically.
    It should also be noted that it would be possible to exchange the offer23, 25, 26 used in the embodiments shown in Figures 1, 2 and 4,against anodes connected to a DC generator as shown in Figure 5.6It is obvious that the invention is not limited only to the embodimentsforms of hydraulic percussion drills described above as embodimentspel; it covers, on the contrary, all versions and applications that usesame principle.
    权利要求:
    Claims (9)
    [1]
    Hydraulic percussion drilling machine with rotary impact pressure comprising: - a shaft (9) connected to at least one drill rod (12) comprising a tool (13) intended to be in contact with a rock formation (14) intended for drilling, - a guide device (16 ) for the shaft (9), -a liquid injection circuit designed to supply an injection liquid from a liquid supply line (15) to a tool (13) and to the rock formation to be drilled (14) to remove during drilling the rock drill cuttings from the borehole, the injection liquid being intended to be in contact with the control device and with the shaft, characterized in that it comprises at least one anode (23, 25, 26, 30) arranged in the injection circuit for liquid and intended to stand in contact with the injection liquid, the anode being designed to provide a cathodic protection for metal surfaces in the control device (16) and / or in the shaft (9) against a corrosive attack caused by the injection liquid.
    [2]
    Impact drill according to Claim 1, characterized in that the anode (23, 25) is arranged in a space formed in the control device (16).
    [3]
    Impact drilling machine according to claim 2, characterized in that the space opens towards the outside of the control device (16), and in that the impact drilling machine comprises means for retaining the anode (23) in the space.
    [4]
    Impact drill according to claim 2, characterized in that the control device (16) delimits a substantially annular chamber (18) around the shaft (9) in which the injection liquid is intended to flow, the substantially annular chamber (18) forming the space in which the anode ( 25) is arranged, and in that the shaft (9) has an inner injection channel (21) which opens into the annular chamber (18).
    [5]
    Impact drill according to claim 1, characterized in that the anode (26, 30) is housed in a capsule (27) separated from the control device (16) and from the shaft (9).
    [6]
    Impact drill according to claim 5, characterized in that a first outer end of the capsule (27) containing the anode (26, 30) is connected to the supply line for liquid (5).
    [7]
    Impact drill according to Claim 6, characterized in that a second outer end of the capsule containing the anode is connected to the control device (16) or to the body (4) of the impact drill.
    [8]
    Impact drill according to one of Claims 1 to 7, characterized in that the anode is in electrical continuity with the control device (16) and / or with the shaft (9). 8
    [9]
    Impact drill according to one of Claims 1 to 8, characterized in that the anode (23, 25, 26) is made of a material which has a more electronegative potential than the potential of the material used for the production of the control device (16) and / or for the shaft (9). Impact drill according to one of Claims 1 to 7, characterized in that the anode (30) and the control device (16) are electrically connected to a direct current generator (31) arranged to apply an electric current between the anode and the control device.
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    同族专利:
    公开号 | 公开日
    WO2009118497A3|2009-11-26|
    CA2717654A1|2009-10-01|
    WO2009118497A2|2009-10-01|
    FR2929322B1|2010-03-12|
    SE534700C2|2011-11-22|
    FR2929322A1|2009-10-02|
    FI20105975A|2010-09-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    NL278026A|1962-01-16|
    US3725669A|1971-12-14|1973-04-03|J Tatum|Deep anode bed for cathodic protection|
    FR2837523B1|2002-03-19|2004-05-14|Montabert Sa|ROTO-PERCUTANT HYDRAULIC PERFORATOR HAMMER|
    SE523949C2|2002-03-20|2004-06-08|Atlas Copco Secoroc Ab|Procedure for corrosion protection of particularly corrosion-exposed parts in rock drilling equipment|SE534770C2|2010-01-11|2011-12-13|Atlas Copco Rock Drills Ab|Striking rock drilling machine including a front part with a bobbin case|
    SE536725C2|2012-01-19|2014-06-24|Atlas Copco Rock Drills Ab|Device for flushing fluid sealing at a rock drill, method of manufacture, flush housing and rock drill|
    法律状态:
    2014-11-04| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    FR0801603A|FR2929322B1|2008-03-25|2008-03-25|ROTO-PERCUTANT HYDRAULIC PUNCH HAMMER|
    PCT/FR2009/050377|WO2009118497A2|2008-03-25|2009-03-09|Rotary-percussive hydraulic hammer drill|
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