• 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:
    A damping device for a percussion device for a hydraulic rock drilling machine (1) with a direction of impact (R), comprising a single-piston piston (5) for action against a tool, the damping piston (5) having a first piston portion (6), which is accommodated in a first first damping chamber (7). ) and a second piston portion (8), which is received in a second damping chamber (9). In operation, in normal stroke position for said percussion instrument, the damping piston (5) is mounted against a fixed stop (19) against movements in the direction of stroke. A damping gap (10) is established between the first (7) and the second (9) damping chamber in all axial positions of the damping piston, and the first damping chamber (7) is pressurized with a hydraulic pressure. The invention also relates to a percussion instrument and a rock drilling machine. Fig. 2
    公开号:SE1450172A1
    申请号:SE1450172
    申请日:2014-02-14
    公开日:2015-08-15
    发明作者:Maria Pettersson
    申请人:Atlas Copco Rock Drills Ab；
    IPC主号:
    专利说明:

    It is an object of the present invention to provide a further development of known damping devices, which overall addresses certain problems with the prior art.
    MOST IMPORTANT CHARACTERISTICS OF THE INVENTION This object is achieved in an invention of the kind mentioned in the introduction by in operation, in normal stroke position of said percussion instrument, the damping piston is engaged against a fixed stop against movements in the direction of stroke, that a damping gap is established all axial positions of the damping piston, and that the first damping chamber is pressurized with a hydraulic pressure.
    As a result, an energy-absorbing function is obtained, as well as reduced energy consumption, since a fluid supply or damping liquid flow from the damping device is no longer required to reach a flow position.
    Since the movements of the damping piston by the invention become more limited in comparison with a corresponding damping device of known type, no specially inserted accumulator will be required for supplying the damping device, which entails further reduced costs.
    In comparison with a conventional so-called single damper, which in principle functions as a spring, is achieved by the invention effective energy absorption and thus effective damping of reflected shock waves. Better conditions for rock contact during as large a part of the drilling cycle as possible can thus be expected, as well as improved tightening of drill string joints and thus better economy for drilling.
    Since the invention offers a simplified construction vis-à-vis comparable damping devices, the result is a more economical solution. ~ 77748, 2014021412163621458; 2014-02-14 10 15 20 25 30 When the percussion device has driven the drill neck adapter or equivalent component through a stroke, the drilling machine will be driven by the feed system, which may need to be set to a higher feed force or equivalent relative to a known floating double damper due to the expected reduced axial motions of the damping piston.
    In a subsequent rock reflex, the damping piston is then driven backwards for a distance, whereby liquid volume displaced from the damping chambers is driven through the damping gap and heated in it, whereby the reflected energy is absorbed. Return of the damping piston to the fixed stop is then provided by the pressure in the first damping chamber, by the permanent pressure setting of this chamber.
    It is preferred that the damping piston act against the tool through something from the group consisting of: directly, via a drill bush, via a portion of a rotary housing.
    Preferably, the first damping chamber is connected to a source of percussion pressure, which is advantageous since thereby a pressure of a suitable size already available in the machine can be utilized.
    It is preferred that a pressure fluid channel is connected to the first damping chamber, which has a restriction in the area of its mouth in the first chamber. Because the throttle is adjustable or dimensionable for adapting the speed of the damping piston during damping movements, the damping can be adapted to different expected operating conditions etc.
    It is preferred that a volume / cross-sectional area ratio of the first damping chamber exceeds a volume / cross-sectional area ratio of the second damping chamber. In this case, the second chamber becomes a stiffer chamber, from which the main displacement of fluid occurs, which finds its way through adjacent damping gap (s) for energy absorption. ~ 77748.20l402l4l2l6362l458; 2014-02-14 10 15 20 25 30 Leak gaps preferably connect to each axial end of a damping chamber facing in the direction of an adjacent damping chamber.
    It is preferred that each leak gap communicates with a channel connected to drainage or return flow.
    It is within the scope of the invention that the second damping chamber has a damping gap connection with at least one further damping chamber, in which a corresponding piston portion arranged on the damping piston is received.
    The second damping chamber is preferably advantageously closed as at said leakage gap starting from one axial end and a damping gap starting from another axial end.
    It is preferred that the damping piston at its end directed in the direction of impact has an abutment portion for co-operation with a fixed stop in a housing of the rock drilling machine in the form of an axially directed abutment surface.
    The invention also relates to a percussion device with an attenuation device attenuation device as above for attenuation of rock reflexes.
    The invention also relates to a rock drilling machine including such a percussion device. Such a rock drilling machine may in various suitable embodiments include a drill bush and / or a portion of a rotary housing between the damping piston and the tool.
    Corresponding advantages as above with respect to the damping device are achieved with a percussion device together with a rock drilling machine according to the invention.
    Further features and advantages of the invention will be explained in the following detailed description with reference to the accompanying drawings.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to exemplary embodiments with reference to the drawings, in which: ~ 77748. 2014021412163621458; 2014-02-14 10 15 20 25 30 Fig. 1 very schematically shows a rock drilling machine, Fig. 2 shows a damping device according to the invention in a first embodiment, Fig. 3 shows a damping device according to the invention in a second embodiment, and Fig. 4 shows a damping device according to the invention in a third embodiment.
    DESCRIPTION OF EMBODIMENTS A rock drilling machine according to the invention is shown schematically in Fig. 1, wherein the drilling machine 1 in a housing 3 encloses a damping device for damping rock reflexes arising after a percussion piston 4 has made a blow to a drill neck 2.
    The damping device, which is shown in more detail in Fig. 2, comprises a damping piston 5 located concentrically around the percussion piston 4, which abuts with an abutment surface 20 against a corresponding contact surface 18 on the drill neck 2, and abuts against a fixed stop by means of an abutment portion 21. 19 in the form of an axially directed surface in the machine housing 3. This fixed stop 19 provides a defined position for the damping piston 5 during normal operation of the percussion drill of the rock drilling machine when the percussion piston 4 performs a stroke against the drill neck 2 in a stroke direction R.
    The damping piston 5 has a first piston portion 6, which is accommodated in a first damping chamber 7 as well as a second piston portion 8, which is accommodated in a second damping chamber 9. Both the first and the second damping chamber are annular chambers, which are concentric around one with the percussion piston 4 and the damping piston 5 common axis of symmetry A.
    Between the first and the second damping chamber 6 resp. 9, in all possible axial positions of the damping piston 5, a damping gap 10 is established, which provides some leakage communication between the damping chambers, and which connects to a first axial end of the second damping chamber 9. In addition, with connection to ~ 77748.20l402l4l2l6362l458; 2014-02-14 10 15 20 25 30 a front axial end of the first damping chamber, opposite the rear axial end, where the damping gap 10 extends, established a leakage gap 11 towards the housing 3, which leakage gap communicates with a drainage channel 13. The drainage channel 13 leads to a collection tank or with a return line for conducting penetrating hydraulic medium for reuse in the percussion instrument.
    To a second axial end of the second damping chamber 9 opposite the first axial end where the damping gap 10 extends, a leakage gap 12 extends, which in turn communicates with a drainage channel 14, which leads to a collecting tank. Also in this case, the drainage channel 14 can be a return channel as above.
    Connected to the first damping chamber 7 is further a pressure fluid channel 16, which provides substantially constant pressurization of this first damping chamber 7 by connection to a pressure source 15, which is preferably a source of pressure fluid under percussion pressure.
    In the area of the connection of the pressure fluid channel 16 to the first damping chamber 7, the pressure fluid channel 16 is provided with a choke 17, which is adapted or adjustable for adapting the return movement of the damping piston 5 when the damping piston 5 receives a percussion reflex from the drill neck 2.
    During operation of the percussion device according to the invention, the damping piston 5 was considered by the present pressures in the first and in the second damping chamber partly towards said fixed stop, partly towards the contact surface of the drill neck. Upon receiving a rock reflex, the drill neck 2 will move axially opposite the direction of impact R, and thereby drive the damping piston 5 somewhat in the same direction, namely opposite the direction of impact R. As a result, liquid contained in the second damping chamber 9 will be substantially forced through the damping gap 10. for energy absorption.
    In essence, it can be said that the damping gap 10 is dimensioned so that the flow is thereby adjusted to obtain an adapted ~ 77748 .20l402l4l2l6362l458; 2014-02-14 10 15 20 25 30 desired damping. In addition, the leakage gaps 11 and 12, respectively, are dimensioned to obtain a suitable desired cooling of the damping device in operation.
    Due to the geometry of the first and second damping chambers, where a volume / cross-sectional area ratio of the first damping chamber 7 exceeds a volume / cross-sectional area ratio of the second damping chamber 9, the second damping chamber 9 will act as a stiffer, less elastic chamber, while the first damping chamber will appear as a more elastic and softer damping chamber, whereby also some backflow into the pressure fluid channel 16 over the choke 17 occurs. Even from the first damping chamber 7, however, a certain volume of liquid will penetrate through the leakage gap 11 so that an energy absorption and a motion damping take place there. Through the damping gap 10, as above, as a result of a rock reflex, a liquid transport will take place mainly from the second damping chamber 9, whereby an energy uptake and a damping will occur.
    Fig. 3 shows an alternative embodiment, in which the damping piston 5 abuts against the drill neck 2 via a drill bush 26, which in addition has means for co-operation with a fixed stop at 25 is shown in abutment against Otherwise the basic solution is the same. The same and corresponding elements have been given the same reference numerals as in Fig. 2.
    Fig. 4 shows a third embodiment of the invention, in which the damping piston 5 abuts only against a rotating housing 24, which surrounds the upper part 2 of the drill neck 2. In this case, the rotation housing 24 abuts against an axially fixed stop 23 acting between the rotation housing 24 and the housing 3, which in this case constitutes the fixed stop, against which the damping piston 5 is arranged to counteract movements thereof in the direction of impact. ~ 7774B. 2014021412163621458; The invention may be varied within the scope of the appended claims. Transmission of shockwave reflectors to the damping piston may also be arranged differently.
    The liquids which are used in connection with the invention are the usual hydraulic liquids for similar applications. ~ 7774B. 2014021412163621458; 2014-02-14
    权利要求:
    Claims (14)
    [1]
    A damping device for a percussion device for a hydraulic rock drilling machine (1) with a direction of impact (R), comprising a damping piston (5) for action in an axial direction against a tool intended for driving the percussion instrument, the damping piston (5) having a first piston portion (6), which is accommodated in a first damping chamber (7) and a second piston portion (8), which is accommodated in a second damping chamber (9), characterized in that - in operation, in the normal striking position of said percussion, the damping piston (5 ) is mounted against a fixed stop (19, 22) against movements in the direction of impact, - that a damping gap (10) is established between the first (7) and the second (9) damping chamber in all axial positions of the damping piston, and - that it the first damping chamber (7) is pressurized with a hydraulic pressure.
    [2]
    Damping device according to claim 1, characterized in that the damping piston (1) acts against a drill neck (2) through something from the group consisting of: directly, via a drill bush, via a portion of a rotary housing.
    [3]
    Damping device according to Claim 1 or 2, characterized in that the first damping chamber (7) is connected to a source (15) for percussion pressure.
    [4]
    Damping device according to one of Claims 1 to 3, characterized in that a pressure fluid channel (16) is connected to the first damping chamber (7), which has a throttle (17) in the region of its mouth in the first chamber (7). ~ 77748.201402l412l6362l45B; 2014-02 ~ 14 10 15 20 25 30 lO
    [5]
    Damping device according to Claim 4, characterized in that the throttle (17) is adjustable or dimensionable for adjusting the speed of the steam piston (5) during steam movements.
    [6]
    Damping device according to one of Claims 1 to 5, characterized in that a volume / cross-sectional area ratio of the first damping chamber (7) exceeds a volume / cross-sectional ratio of the second damping chamber (9).
    [7]
    Damping device according to one of Claims 1 to 6, characterized in that lid slots (11, 12) connect to each axial end of a damping chamber (7, 9) which faces in the direction of an adjacent damping chamber.
    [8]
    Damping device according to one of the preceding claims, characterized in that each lid gap (11, 12) communicates with a channel (13, 14) connected to drainage or return flow.
    [9]
    Damping device according to Claim 8, characterized in that the first and / or the second damping chamber (7, 9) has a steam gap connection with at least one further damping chamber, in which a corresponding piston portion arranged on the steam piston is received.
    [10]
    Damping device according to any one of claims 7 - 9, characterized in that the second damping chamber (9) is closed so as to reach as on said damping gap (10) starting from a first axial end and a lid gap (12) starting from a second axial breath.
    [11]
    Damping device according to one of the preceding claims, characterized in that the damping piston (5), on its spirit directed in the direction of the stroke, has an abutment portion (21) for co-operation with a ~ 77748. 2014021412163621458; 2014-02-14 10 ll fixed stop in a housing (3) for the rock drilling machine (1) in the form of an axially directed abutment surface (19).
    [12]
    Percussion instrument with an attenuation device for attenuation of rock reflectors, characterized in that it includes an attenuation device according to any one of claims 1 - 11.
    [13]
    Rock drilling machine, characterized in that it includes a percussion device according to claim 12.
    [14]
    Rock drilling machine according to claim 13, characterized in that it comprises a drill bush (3) and / or a portion of a rotary housing between the damping piston (8) and the tool. ~ 77748. 2014021412163621458; 2014-02-14
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1450172A|SE537838C2|2014-02-14|2014-02-14|Damping device for percussion, percussion and rock drill|SE1450172A| SE537838C2|2014-02-14|2014-02-14|Damping device for percussion, percussion and rock drill|
    AU2015217621A| AU2015217621B2|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    KR1020167019838A| KR101924701B1|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    PCT/SE2015/050035| WO2015122824A1|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    EP15749042.6A| EP3105415A4|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    JP2016550740A| JP2017505723A|2014-02-14|2015-01-16|Damping device for impact device, impact device and rock drill|
    US15/103,968| US10456898B2|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    CA2938151A| CA2938151C|2014-02-14|2015-01-16|Damping device for a percussion device, percussion device and rock drilling machine|
    CN201580008286.0A| CN105980658B|2014-02-14|2015-01-16|Buffer unit, percussion device and rock drill for percussion device|
    ZA2016/03935A| ZA201603935B|2014-02-14|2016-06-09|Damping device for a percussion device, percussion device and rock drilling machine|
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