• 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:SE1251342A1
    申请号:SE1251342
    申请日:2012-11-28
    公开日:2014-05-29
    发明作者:Erik Jakobsson；Thomas Johansson
    申请人:Atlas Copco Rock Drills Ab；
    IPC主号:
    专利说明:

    This object is achieved in a device according to the above in that at least one of the valve ends is movable in axial direction against a stop so that it defines a fixed end position for the valve body and that a pressing device is arranged for pressing the at least one of the valve ends in the direction of the other of said valve ends and against said stop.
    This achieves that the valve becomes easier and more economical to manufacture and to integrate in a rock drilling machine. Namely, the invention achieves that the machining operation in order to accurately and with high tolerances create a defined axial position for a bottom in a bottom hole is eliminated.
    Instead, the respective valve end is actuated by a pressing device to be normally pressed against said abutment abutment in the direction of the second valve end of the distribution valve to obtain a fixed end position.
    This means that instead a defined stop can be provided, which can be done with great precision and at a much lower cost than is the case to create a defined position in a bottom hole. The stop can be arranged in the valve housing or on a special sleeve or the like arranged between the two valve ends.
    It is preferred that each pressing device comprises a gable piston portion arranged on each valve end, which is accommodated in a pressurizable cylinder portion, for pushing the valve end against said stop during pressurization. This cylinder portion then has a connection to a hydraulic pressure source. The hydraulic pressure source is preferably a system pressure source for the rock drilling machine, which in an economically favorable manner means that a pressure source already existing for the machine can be used. Such a system pressure source 77212 20120905; 2012-11-28 10 15 20 25 30 can be a source for, for example, something of percussion pressure, rotational pressure and damping pressure.
    It is preferred that the valve chamber in the radial direction is limited by a valve liner, which is formed with said abutment. In this way, the position of said abutment and thus the end positions of the valve body can be determined and provided in an economical manner with high precision.
    Since the valve liner can be designed to form a unit, which comprises both the guide edges of the valve chamber cooperating with the valve body and the said abutments, which in cooperation with the respective valve end define the end position (or end positions) of the valve body, the valve chamber can be ensured in an economical, efficient and safe manner. different elements that are crucial for the steering are carefully positioned in relation to each other.
    The valve liner suitably abuts on one side opposite one (or first) of the valve ends to the other of the valve ends, which in this embodiment is a fixed valve end.
    By this embodiment, wherein the valve liner is axially displaceably received in a space receiving the valve, and wherein according to above the said valve end is pressed against the valve liner, it is normally ensured that both end positions of the valve body are correctly positioned relative to the guide edges in the valve liner.
    As a variant, the valve liner suitably abuts against a housing wall, against which also one of the valve ends, which is also fixed in this case, is arranged to abut.
    As a further variant, both a first and a second valve end can be movable in axial direction against a respective abutment, so that when they are pressed against a abutment by a respective pressing device, they define 77212 20120905; 20l2-ll-2ß 10 15 20 25 30 both end positions of the valve body. This is particularly relevant when the valve chamber is not limited by an inserted valve liner.
    In one aspect of the invention, an end position adjusting device is provided at said at least one of the valve ends for positioning it axially relative to said stop for adjusting the end position (s) of the valve body. This makes it possible to influence the working area of the valve, the cross section of the flow paths and thus the operation of the rock drilling machine. The end position control device suitably comprises a chamber pressurizable with varying pressures acting against something from the group: a mechanical spring device, a hydraulic / pneumatic spring device, a spring device of synthetic elastic material, a spring device of rubber material.
    As an alternative to having a pressing device acting with hydraulic means, it is possible to use a spring acting against the respective end wall instead. However, this variant is not preferred because it does not allow the desired maximum precision without special efforts.
    The invention also relates to a hydraulic rock drilling machine with a machine housing, which accommodates a working cylinder with a reciprocating percussion piston comprising a device as above.
    Preferably, said device and said distribution valve are accommodated in the machine housing of the rock drilling machine, which provides good opportunities for integration of components and thus for financial savings.
    It is preferred that the distribution valve has a shaft which is parallel to a shaft of the working cylinder, which makes it possible to build the rock drilling machine slim and space-saving.
    It is also preferred that the rock drilling machine has a machine end for the working cylinder, which machine end also closes a space for receiving the distribution valve. This 77212 20120905; 2012-11-28 10 15 20 25 30 results in a single dividing plane being used for both the working cylinder and the distribution valve, which provides further reduced costs and sealing benefits.
    Further features and advantages of the invention will become apparent from the following description of exemplary embodiments.
    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 equipped with a device according to the invention in an axial section, Fig. 2 shows an enlarged section of a rear end area of the rock drilling machine in Fig. 1, and Figs. 3 and 4 show very schematically two further variants of distribution valves.
    DESCRIPTION OF EMBODIMENTS Fig. 1 thus shows in an axial section a rock drilling machine 1 including a machine housing 2, in which a percussion piston 3 is axially reciprocable inside a cylinder space constituting a working cylinder 4. The percussion piston 3 performs strokes in a direction of stroke R against a drill neck 5 in a manner known per se.
    At the rear end area of the rock drill 1 is arranged a cylinder space 4 closing rear housing end 6. In this rear end area a distribution valve 7 for distributing pressure fluid to the drive chambers' drive chambers for driving the percussion piston 3 back and forth is also arranged.
    Fig. 2 shows said rear end area on an enlarged scale, from which it appears that the distribution valve 7 has a valve body 8 movable back and forth in a valve liner 9, which is movable between two end positions defined by abutments against a 77212 20120905; 2012-11-28 10 15 20 25 30 first valve end 10 and against a second valve end 11, respectively.
    The valve liner 9 delimits a valve chamber 33 for receiving the valve body 8 and has customary bores, which constitute channel openings for channels connected to the distribution valve 7. The valve liner is designed to accurately define guide edges for cooperation with corresponding guide projections on the valve body 8.
    The distribution valve 7 is arranged in a valve space 20 in the housing 2, which is closed by said rear housing end 6.
    The first valve end 10 can be pressurized by a chamber 13 permanently pressurized in operation of the rock drilling machine 1, which cooperates with a piston portion 25 on the first valve end 10. Through this pressurization the first valve end 10 is pushed towards the second valve end 11.
    The valve end 10 has a stop surface 26 facing said second valve end 11, which will abut against a stop 12 at the end of the valve liner 9. As a result, the valve end 10 will be correctly positioned opposite the valve end 11 when pressurizing the chamber 13.
    It will be appreciated that for proper positioning of the first valve end 10 and thus for an end position of the valve body 8 there is no longer a need for careful machining with high tolerances of a bottom hole formed with a surface facing towards the second valve end 11 in what which corresponds to the space occupied by the distribution valve 7, as shown in Fig. 2.
    Overall, the invention provides that all the elements intended in the valve chamber 33 for co-operation with the valve body 8 as above can be accurately positioned relative to each other by the valve liner 9 being processed in a comparatively simple manner with respect to guide edges, as well as on its (their) (appropriation) end (ends). 77212 20120905; 2012-11-28 10 l5 20 25 30 In the position shown in Fig. 2, the valve body 8 with a first stop end 21 is located at a distance from a first end stop 17 on the first valve end 10 for the valve body 8. The valve body 8 this position is in abutment with a second stop end 22 against a second end stop 34 on the second valve end 11.
    An intermittently pressurized channel 14 is in this position shown pressurized so that a hydraulic pressure acts on an end surface 15 of a central end piston portion 23 of the valve body 8, with the result that this assumes the position shown in Fig. 2 and described above.
    When the channel 14 instead becomes depressurized (not shown) due to the movement of the percussion piston 3, the valve body 8 will be driven to the left in the figure, so that the first stop end 21 of the valve body 8 abuts against the first end stop 17 on the first valve end 10 .
    This is achieved by a permanently pressurized space 16 inside the valve body 8 receiving fluid, under pressure by means of holes 27 in the wall of the valve body, so that the pressure in this space 16 acts against the end surface 24 of the space 16 for driving the valve body 8 to the left in the figure.
    The invention can also be realized in that both the first and the second valve end 10, 11 are movable so that both valve ends are pressable against abutments in the direction of each other for defining two defined end positions for the valve body 8.
    The distribution valve 7 can be designed even without a specific valve liner 9. In that case, for example, a stop corresponding to the stop 12 can be arranged in another way in the valve space 20, for example through an inserted reading sleeve having a stop (corresponding to 12) for the valve end 10. Alternatively a bore with a stop may be made from the opposite end 77212 20120905; 2012-11-28 10 15 20 25 30 towards the mouth shown in Fig. 2 or in some other manner known per se.
    In Fig. 2, the distribution valve 7 is shown with its valve shaft 18 parallel to the shaft 19 of the percussion piston 3 and the working cylinder 4, which is the axis of the percussion of the rock drilling machine 1. This embodiment has the advantage that the rock drilling machine can be made slim and space-saving on its rear. It also allows that said rear housing end 6 is common to the working cylinder and the distribution valve so that an otherwise necessary dividing plane can be saved. Through the design with common shafts and common rear end, the advantage is achieved with lower machining costs and thus lower cost for the drilling machine. In addition, the risk of moisture and contaminants penetrating the machine and the risk of breakage through unintentional loosening screws are reduced.
    It is not excluded that the pressing device is designed in another way, for instance by a spring being arranged, which presses the valve end against its stop, which arrangement, however, entails a, albeit smaller, variation in abutment force as a function of a chamber receiving this spring. which can be disadvantageous. An advantage of this arrangement, however, is that channels for permanent pressurization of a chamber corresponding to the chamber 13 are omitted.
    A further advantage of having a pressurized valve end is that the valve on abutment against this end experiences a softer abutment, since the pressurized valve end will spring away somewhat and be somewhat resilient in connection with the abutment with the valve body. This reduces the stresses on the valve and thus leads to improved function and increased service life. It is possible within the scope of the invention to enable control of this suspension by means of, for example, dimensioning of an enclosed volume and of a restriction in the hydraulic medium supply line. 77212 20120905; 2012-11-28 10 15 20 25 Fig. 3 shows a variant of a distribution valve, in which a chamber 13 'is pressurizable with a variable pressure through a variable pressure source 30 against the action of a spring 28.
    By applying pressure to this chamber 13 ', the valve end will thus be adjusted so that the higher the pressure, the longer the valve end 10 "will be adjusted in the direction of the second valve end 11". In certain special operating cases, this provides opportunities to regulate the end position of the valve body and thereby the operation of the rock drilling machine. In this case, the term "stop" shall be interpreted as meaning that the pressure is so high that the spring bottoms out, whereby a "fixed" stop is obtained. For lower pressures, the said adjustability is thus obtained. The channels of the distribution valve are omitted from Fig. 3 for the sake of clarity. Ducts for pressurized hydraulic fluid are indicated by dashed lines.
    Fig. 4 shows a variant of a distribution valve similar to that in Figs. 1 and 2, but in this case (as in Fig. 3) it is intended to illustrate a distribution valve without a valve liner. "Valve space" in these cases constitutes "valve chamber". A chamber l3 "" is pressurizable with a constant pressure. With l2 '"a stop is indicated in the housing, which can be a machine housing for a rock drilling machine or a valve housing.
    The abutment l2 "is suitably produced by drilling from the left, which is a distance opposite the opening for the bore for the space for the distribution valve set in all embodiments. A lid for the further drilling is designated 29. 77212 20120905; 2012-11-28
    权利要求:
    Claims (15)
    [1]
    Device at a hydraulic rock drilling machine (1) including a distribution valve (7, 7 ', 7 ") arranged in connection with the rock drilling machine for controlling hydraulic flows to different parts of the rock drilling machine, the distribution valve comprising one in a valve chamber (33) in axial directions reciprocally arranged valve body (8, 8 ', 8 ") and wherein the valve chamber in the axial direction is limited by two valve ends (10, 11; 10", 11'; 10 ", 11"), characterized in that - at least one of the valve ends is movable in axial direction against a stop (12, 12 ") so as to define an end position of the valve body, and - that a pressing device (13, 13 ', 13") is arranged for pressing the said at least one of the valve ends in the direction of the other of said valve ends and towards said abutment.
    [2]
    Device according to claim 1, characterized in that each pressing device (13, 13 ', 13' ") comprises a gable piston portion arranged on each valve end, which is accommodated in a pressurizable cylinder portion, for pushing the valve end against said stop during pressurization.
    [3]
    Device according to Claim 2, characterized in that the cylinder portion has a connection to a hydraulic pressure source.
    [4]
    Device according to Claim 3, characterized in that the hydraulic pressure source is a system pressure source for the rock drilling machine (1).
    [5]
    Device according to any one of the preceding claims, characterized in that the valve chamber (33) is limited in radial direction by a valve liner (9), which is formed with said stop (12). 77212 20120905; 2012-11-28 lO 15 20 25 30 ll
    [6]
    Device according to claim 5, characterized in that the valve liner (9) abuts on one side opposite one of the valve ends (10) against the other of the valve ends (11).
    [7]
    Device according to claim 5 or 6, characterized in that the valve lining (9) abuts against a housing wall, against which also one of the valve ends (11) is arranged to abut.
    [8]
    Device according to one of the preceding claims, characterized in that both valve ends, both a first and a second valve end, are movable in the axial direction against a respective stop, so that when pressed against a stop by a respective pressing device they define both valve body end positions.
    [9]
    Device according to any one of the preceding claims, characterized in that an end position adjusting device is arranged at said at least one of the valve ends (10 ') for positioning it in axial direction relative to said stop for adjusting the end position (end positions) of the valve body.
    [10]
    Device according to claim 9, characterized in that the end position control device comprises a chamber (13 ') pressurizable with varying pressure (30) acting against one of the group: a mechanical spring device, a hydraulic / pneumatic spring device, a spring device of synthetic elastic material, a spring device of rubber material.
    [11]
    11. ll. Device according to Claim 1, characterized in that the pressing device comprises a spring acting against the respective end wall.
    [12]
    Hydraulic rock drilling machine (1) with a machine housing (2), which accommodates a working cylinder (4) with a reciprocating percussion piston (3), characterized in that the rock drilling machine comprises a device according to any one of claims 1 - 11. 77212 20120905; 2012-l1 ~ 28 lO 12
    [13]
    Hydraulic rock drilling machine according to claim 12, characterized in that said device and said distribution valve are accommodated in the machine housing.
    [14]
    Hydraulic rock drilling machine according to Claim 12 or 13, characterized in that the distribution valve has a shaft (18) which is parallel to a shaft (19) of the working cylinder (4).
    [15]
    Hydraulic rock drilling machine according to claim 12, 13 or 14, characterized in that the rock drilling machine has a machine end (6) for the working cylinder (4), which machine end also closes a space (20) receiving a distribution valve. 77212 20120905; 20l2-ll> 2B
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    CN104822496A|2015-08-05|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1251342A|SE536903C2|2012-11-28|2012-11-28|Device at distribution valve for a rock drill and rock drill|SE1251342A| SE536903C2|2012-11-28|2012-11-28|Device at distribution valve for a rock drill and rock drill|
    JP2015544035A| JP6304834B2|2012-11-28|2013-11-22|Rock drilling equipment and rock drill|
    US14/435,209| US9937611B2|2012-11-28|2013-11-22|Device in a rock drilling machine and rock drilling machine|
    EP13859488.2A| EP2925491B1|2012-11-28|2013-11-22|Device in a rock drilling machine and rock drilling machine|
    CA2888570A| CA2888570C|2012-11-28|2013-11-22|Device in a rock drilling machine and rock drilling machine|
    AU2013352659A| AU2013352659B2|2012-11-28|2013-11-22|Device in a rock drilling machine and rock drilling machine|
    PCT/SE2013/051376| WO2014084776A1|2012-11-28|2013-11-22|Device in a rock drilling machine and rock drilling machine|
    CN201380061945.8A| CN104822496B|2012-11-28|2013-11-22|Device in rock drill and rock drill|
    ZA2015/04599A| ZA201504599B|2012-11-28|2015-06-25|Device in a rock drilling machine and rock drilling machine|
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