• 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 device for a hydraulic rock drilling machine (1) for the protection of a piston seal unit (6) for sealing between a percussive piston (4) and a cylinder in a housing (2) of the rock drilling machine, wherein a piston guide (5) is positioned between the piston seal unit (6) and a working space in the cylinder. Between the piston guide (5) and the piston seal unit (6) there is arranged a surrounding ring- shaped inwardly open chamber (9), which is formed for receiving a hydraulic liquid volume. A hydraulic supply flow channel (12,13) for hydraulic liquid supply is connected to said chamber (9). The invention also concerns a rock drilling machine and a method.
    公开号:SE1250726A1
    申请号:SE1250726
    申请日:2012-06-28
    公开日:2013-12-29
    发明作者:Per Jonsson
    申请人:Atlas Copco Rock Drills Ab；
    IPC主号:
    专利说明:

    Extends between a chamber in a shock absorber and an area adjacent to a seal. The oil channel comprises a series of throttles and oil volumes to prevent the movement of cavitation bubbles through the oil channel. The document states that this arrangement can be used with a percussion piston in a rock drilling machine.
    OBJECTS / LENGTH OF THE INVENTION AND MOST IMPORTANT CHARACTERISTICS It is an object of the present invention to provide a further development of prior art arrangements for protecting piston seals in hydraulic rock drills and to at least reduce the problems caused by cavitation occurring on the piston seals.
    This object is achieved in a device of the kind mentioned in the introduction by arranging between the piston guide and the piston sealing unit a circumferential, annular, inwardly open chamber, which is designed for receiving a volume of hydraulic fluid, and that a hydraulic inlet channel for hydraulic fluid supply is connected to this.
    By in this way providing a liquid flow to the inwardly open chamber, which liquid flow is preferably substantially continuous and / or constant, it is effectively ensured that pressure variations are damped and in particular that the hydraulic liquid next to the piston sealing unit does not contain cavitation bubbles. Namely, the liquid flow ensures that over time, there is constantly an excess of hydraulic fluid, in which pressure variations can be equalized by the elasticity of the fluid and thereby avoid cavitation bubbles propagating due to insufficient supply of unaffected hydraulic fluid in this area.
    It is preferred that said hydraulic inlet channel is arranged to start from a return flow channel from a hydraulic shock absorber in the rock drilling machine, since this provides a hydraulic flow of suitable magnitude, a hydraulic flow which is also already present in the rock drilling machine and which is previously used its primary use. The use of this return flow therefore does not cause any power reduction or further power withdrawal from the rock drilling machine. Alternatively, the source is a controllable constant flow source, which means a certain power output, but provides greater opportunities for controlling the flow.
    It is suitable and rationally rational if the piston sealing unit is supported by a sealing holder, in which said chamber is accommodated.
    Suitably the piston sealing unit has two axially spaced sealing devices.
    Said chamber preferably connects to an auxiliary chamber via at least one connection channel, whereby an increase in the amount of available hydraulic fluid can be ensured. It is preferred that said hydraulic inlet channel is arranged to connect to said chamber via the auxiliary chamber.
    In a hydraulic rock drilling machine according to the invention, a leak drainage drain is preferably arranged between said chamber and the piston guide. This leakage drain is suitably connected via a gap to a collection tank.
    Between the chamber and the leakage drainage drain there is advantageously a gap against the percussion piston, which gap is kept with a small gap height and a short axial length in order to give the best possible effect. In a preferred aspect of the invention, the hydraulic rock drilling machine includes a processor and control means for effecting control of said hydraulic fluid supply in response to pressure variations sensed by a pressure sensor.
    Suitably, the pressure sensor senses pressure variations in said chamber or, where applicable, in said auxiliary chamber.
    The invention also relates to a method for protecting a piston sealing unit for sealing between a percussion piston and a cylinder in a housing of a rock drilling machine, wherein a piston guide is inserted between the piston sealing unit and a working space in the cylinder. Hydraulic fluid from a hydraulic fluid source is supplied to a circumferential, annular, inwardly open chamber provided between the piston guide and the piston sealing unit for receiving a volume of hydraulic fluid.
    Corresponding features and advantages stated above for the device are also relevant for the method according to the invention.
    When the hydraulic fluid supply is regulated in response to sensed pressure variations, the said hydraulic fluid supply is typically increased in response to increased pressure variations being registered.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to exemplary embodiments and with reference to the accompanying drawings, in which: Fig. 1 shows a rock drilling machine according to the invention in an axial partial section, Fig. 2 shows an enlargement of an area of the image in Figs. 1, and Fig. 3 schematically illustrates a method according to the invention. DESCRIPTION OF EMBODIMENT Fig. 1 shows in an axial section a hydraulic rock drilling machine 1, which in a housing 2 has one in a cylinder 3 forward and eats movable percussion piston 4. The percussion piston 4 is controlled in the housing 2 by a piston guide 5 in the form of a guide sleeve. A piston sealing unit 6, which is arranged to prevent hydraulic fluid from penetrating into the lower part of the rock drilling machine, is provided with two axially separated sealing devices in the form of piston seals 10 and 11.
    The percussion piston 4 exerts in action percussion action against a drilling neck 8, which is accommodated in the drilling machine, and against which in a manner known per se a damping piston 7 abuts for attenuation of percussion reflexes. The damping piston 7 has a damping flow circuit 29 for its supply.
    At the piston sealing unit 6 an annular chamber 9 is formed, which faces inwardly towards the percussion piston 4, and which is located between the piston seals 10, 11 and the piston guide 5. The annular chamber 9 is in the embodiment shown fed by a substantially continuous and suitably constant hydraulic fluid flow in in the form of a return flow from the attenuation unit via a supply channel including a channel 12 and auxiliary channel (s) 13 (see Fig. 2). This flow through the channel 12 goes to the chamber 9 also via an auxiliary chamber 14 located at a smaller distance from the chamber 9, through which an additional volume of hydraulic fluid is provided in the vicinity of the annular chamber 9, which is valuable for increasing the effect of the invention.
    A variant for providing a hydraulic fluid flow to the chamber 9 is illustrated by the damping flow circuit generally designated 29, which comprises a hydraulic pump 30 and a controllable throttle 31. Hydraulic fluid supplied through the circuit 29 is delivered to the damper through line 33 and then led according to 77198 20120530 10 Above after the damper via the channel 12 to the chamber 9.
    Alternatively, a flow may flow from the hydraulic pump 30 and the throttle 31 (or other source of hydraulic fluid) directly to the chamber 9, as indicated by the broken line 32.
    Fig. 2 shows the arrangement at the piston seals in more detail, it being seen that between the piston guide 5 and the piston seals 10, 11, a global drainage drain designated by 34 is arranged. This leakage drainage drain 34 has an internally open, continuously extending circumferential groove at the innermost part of the piston, which communicates via radial channels 19 with a collecting space 15, which in turn diverts collected hydraulic fluid via a channel 17 to a collecting tank 18.
    In operation of the device according to the invention, due to the movements of the percussion piston during certain operating conditions, large pressure variations arise in the space 3 'between the percussion piston 4 and the wall of the cylinder 3. The space 3' here constitutes a working space in the cylinder.
    The pressure variations, if large enough, in turn lead to the formation of cavitation bubbles, which tend to accompany leaking hydraulic fluid and penetrate through a gap formed between the piston guide 5 and the percussion piston 4. With large amounts of cavitation bubbles in the liquid, conventional rock drilling machines risk at least one of the bubbles find their way all the way to the piston seals 10, 11 in order to cause damage to these piston seals in the event of a collapse of the cavitation bubbles.
    Some of the cavitation bubbles are diverted via the leakage drain 34, but as indicated above, it has been found that this arrangement is not entirely sufficient to eliminate the risk of damage to the seals. A problem with the conventional arrangement has also been found to arise when in the drilling machine the collecting space 15 is connected to other drainage drains from other components in the drilling machine.
    Namely, it has been found that unwanted pressure variations with accompanying cavitation bubbles in these other components can be transmitted via the leakage drain 34 to the area between the piston guide 5 and the piston seals 10, 11 and cause damage to these.
    This insight is taken as the whole background to the establishment of the annular chamber 9 open inwards towards the piston between the piston guide 5 and the piston sealing unit. This chamber 9 is designed to receive a volume of hydraulic fluid, and a hydraulic inlet channel 12, 13 is arranged for hydraulic fluid supply to this chamber 9. PS indicates an alternative hydraulic fluid source.
    Preferably, this hydraulic inlet channel starts from the return flow channel from the damper in the rock drilling machine, as above. Hydraulic fluid supplied to the chamber 9 is then discharged via the gap 16 through the leakage drain 34 to the tank.
    Denoted by 14 is an auxiliary chamber, which is annular and located radially outside the chamber 9. The chamber 9 communicates with the auxiliary chamber 14 via a number of radially extending auxiliary channels 13. Providing the additional auxiliary chamber 14 results in a preferred increase in hydraulic fluid volume between piston seals and piston guide. which is beneficial for the reduction of the effect of the pressure pulsations and thus the cavitation damage risk.
    In the embodiment shown, the piston sealing unit 6 consists of a double seal with the piston seals 10 and 11 supported by a device constituting a sealing holder 6 ", in which also said annular chamber 9 is accommodated. The invention can be varied within the scope of the Thus, the piston sealing unit 6 may comprise one or more piston seals The height of the gap 16 between the chamber 9 and the leakage drain 34 is suitably kept as small as possible and its axial extent as small as possible.It is preferred that the gap height is set to 0.05 - 1% of the piston diameter and the axial length of the gap to 1 - 10% of the piston diameter.The volume of the chamber 9 should preferably be as large as possible, but it has been found that a volume of 0.5 - 5.0 cm 2 gives a very good effect at The volume of the auxiliary chamber 14 should exceed and preferably be at least twice the volume of the chamber 9.
    It is preferred that the flow of the hydraulic fluid supply is controllable so that it can be adapted to the operation of the rock drilling machine and to any needs. It should be borne in mind that preferably the flow is substantially continuous and / or constant and is not allowed to fluctuate over, for example, a percussion cycle of the rock drilling machine.
    On the other hand, it is an advantage to be able to regulate the magnitude of the flow in response to sensed pressure variations in the chamber 9 or in the auxiliary chamber 14. Sensing of the pressure variations in these positions can be done with per se known pressure sensors of small dimensions. Fig. 2 shows as an example a pressure sensor 27 inserted in the auxiliary chamber 14. Typically, the flow is regulated so that a sensed increase in the pressure variations leads to an increase in the hydraulic fluid flow to the chamber 9.
    Fig. 3 schematically illustrates a method according to the invention, wherein: Position 20 indicates the start of a method sequence.
    Position 21 indicates the supply of hydraulic fluid from a hydraulic fluid source as a return line from a damping unit in the drilling machine to the chamber 9.
    Position 22 indicates detection of pressure variations in the chamber or auxiliary chamber 14.
    Position 23 indicates evaluation of the signals from the pressure sensor 27, which are routed via the signal line 28 to a processor 26.
    Position 24 indicates adaptation of the hydraulic fluid flow to the chamber 9 in response to the result of the evaluation in the processor 26.
    Position 25 indicates the end of the sequence.
    It is to be understood that the procedure sequence is repeated to an extent that is appropriate and necessary for the proper operation of the machine. 77198 20120530
    权利要求:
    Claims (16)
    [1]
    Device at a hydraulic rock drilling machine (1) for protecting a piston sealing unit (6) for sealing between a percussion piston (4) and a cylinder in a housing (2) of the rock drilling machine, a piston guide (5) being inserted between the piston sealing unit (6) ) and a working space in the cylinder, characterized in that - between the piston guide (5) and the piston sealing unit (6) a circumferential, annular, inwardly open chamber (9), which is designed to receive a volume of hydraulic fluid, is arranged, and - that a hydraulic the supply channel (l2, l3) for hydraulic fluid supply is connected to this chamber (9).
    [2]
    Device according to claim 1, characterized in that said hydraulic supply channel (l2, l3) is arranged to start from one of the group: a return flow channel from a hydraulic shock absorber in the rock drilling machine, an adjustable constant flow source.
    [3]
    Device according to claim 1 or 2, characterized in that the piston sealing unit (6) is supported by a sealing holder (6 '), in which said chamber is accommodated.
    [4]
    Device according to one of the preceding claims, characterized in that the piston sealing unit (6) has two sealing devices (10, 11) inserted at axial distance from one another.
    [5]
    Device according to any one of the preceding claims, characterized in that said chamber (9) connects to an auxiliary chamber (14) via at least one auxiliary channel (13).
    [6]
    Device according to claim 5, characterized in that said hydraulic inlet channel (l2, l3) is arranged to connect to said chamber via the auxiliary chamber. 77198 20120530 10 15 20 25 30 ll
    [7]
    Hydraulic rock drilling machine, characterized in that it includes a device according to any one of claims 1 - 6.
    [8]
    Hydraulic rock drilling machine according to claim 7, characterized in that a leakage drain (34) is arranged between said chamber (9) and the piston guide (5).
    [9]
    Hydraulic rock drilling machine according to Claim 8, characterized in that the leakage drainage drain (34) is connected to a collection tank (18) via a collecting space (15).
    [10]
    Hydraulic rock drilling machine according to Claim 8 or 9, characterized in that a gap (16) against the percussion piston is present between the chamber (9) and the leakage drainage drain (34).
    [11]
    Hydraulic rock drilling machine according to any one of claims 7 to 10, characterized in that it includes a processor (26) for regulating said hydraulic fluid supply in response to pressure variations sensed by a pressure sensor (27).
    [12]
    Method for protecting a piston sealing unit (6) for sealing between a percussion piston (4) and a cylinder in a housing (2) of a rock drilling machine (1), wherein a piston guide (5) is inserted between the piston sealing unit (6) and a working space in the cylinder, characterized in that between the piston guide (5) and the piston sealing unit (6) a circumferential, annular, inwardly open chamber (9) is provided for receiving a volume of hydraulic fluid, and that hydraulic fluid is supplied to this chamber from a hydraulic fluid source.
    [13]
    Method according to claim 12, characterized in that said hydraulic fluid supply goes to said chamber (9) via an auxiliary chamber (14).
    [14]
    Method according to claim 12 or 13, characterized in that said hydraulic fluid supply is arranged to start from something of the group: a return flow channel from a hydraulic shock absorber in the rock drilling machine, an adjustable constant flow source.
    [15]
    Method according to any one of claims 12 ~ 14, characterized in that said hydraulic fluid supply is regulated in response to sensed pressure variations in said chamber (9) or, where applicable, in said auxiliary chamber (14).
    [16]
    Method according to claim 15, characterized in that said hydraulic fluid supply is increased in response to increased pressure variations in said chamber or, where applicable, in said auxiliary chamber. 77198 20120530
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1250726A|SE536562C2|2012-06-28|2012-06-28|Device and method of a hydraulic rock drill and rock drill|SE1250726A| SE536562C2|2012-06-28|2012-06-28|Device and method of a hydraulic rock drill and rock drill|
    CA2873386A| CA2873386A1|2012-06-28|2013-05-30|Device and method in respect of a rock drilling machine and rock drilling machine|
    US14/401,876| US20150122117A1|2012-06-28|2013-05-30|Device And Method In Respect Of A Rock Drilling Machine And Rock Drilling Machine|
    PCT/SE2013/050621| WO2014003626A1|2012-06-28|2013-05-30|Device and method in respect of a rock drilling machine and rock drilling machine|
    AU2013281309A| AU2013281309B2|2012-06-28|2013-05-30|Device and method in respect of a rock drilling machine and rock drilling machine|
    EP13809332.3A| EP2867435B1|2012-06-28|2013-05-30|Device and method in respect of a rock drilling machine and rock drilling machine|
    ES13809332T| ES2755624T3|2012-06-28|2013-05-30|Device and method in relation to a rock drilling machine and rock drilling machine|
    CN201380034023.8A| CN104541015B|2012-06-28|2013-05-30|Apparatus and method and rock borer on rock borer|
    JP2015520115A| JP6270169B2|2012-06-28|2013-05-30|Rock drill and apparatus and method related to rock drill|
    IN2613KON2014| IN2014KN02613A|2012-06-28|2014-11-17|
    ZA2014/08931A| ZA201408931B|2012-06-28|2014-12-05|Device and method in respect of a rock drilling machine and rock drilling machine|
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