• 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:SE1050316A1
    申请号:SE1050316
    申请日:2010-04-01
    公开日:2011-10-02
    发明作者:Per Jonsson
    申请人:Atlas Copco Rock Drills Ab；
    IPC主号:
    专利说明:

    The outer to extrude along the piston. Thus, the entire sealing combination is damaged.
    The same problem can occur in a similar way with moving parts other than pistons.
    US6,367,805 discloses a piston in a piston compressor where surface stripping rings are arranged around the piston to remove hydraulic oil from the surface of the piston.
    The stripping rings are not attached either to the compressor housing or to the piston, but move freely and partially follow the movements of the piston. In a drill, the hydraulic oil pressure is higher and the solution in US6,367,805 would work worse there. The rings wear on the piston and on each other. The result will also be very variable depending on where the rings are at the moment. The rings also take up a lot of space - especially as they should have room for movement and not be used for anything else. The large chamber in which the rings are located also takes up space and weakens the house.
    DISCLOSURE OF THE INVENTION The present invention relates to a hydraulic drilling machine comprising a movable device, such as a piston, in a housing. In the housing are arranged at the movable device: a first chamber connected to a return line for hydraulic oil, a seal on a first side of the first chamber, separated from the first chamber by a first gap along the movable device, and a second chamber with higher hydraulic oil pressure than the first chamber and arranged on a second side of the first chamber, separated from the first chamber by a second gap along the movable device. According to the invention, a third chamber is fixedly arranged between the second gap and the first chamber. The third chamber is connected to the first chamber partly via a first passage and partly via a third gap along the movable device.
    The advantages are that the invention reduces the load on the adjacent seal, so that the risk of sealing failures is reduced and the operating time of the drilling machine is extended.
    This is done by guiding the hydraulic oil a detour and thus not hitting the seal at as high a speed as in the prior art. By arranging the third chamber in the housing or in something else fixedly arranged in the housing, such as a piston guide, a predictable result is obtained and a device which can withstand even higher hydraulic oil pressures.
    According to one embodiment, the third chamber is arranged in a piston guide.
    The advantage of this is that the piston control is used for two functions, which provides a compact solution that does not take up a lot of space.
    DESCRIPTION OF THE DRAWINGS The invention will now be explained in more detail with the aid of a preferred exemplary embodiment and with reference to the accompanying drawings, in which Figs. 1-3 show different variants of prior art. In Fig. 4 an average of a first embodiment is shown. In Fig. 5 an average of a second embodiment Fig. 6 shows an average of a third embodiment. PREFERRED EMBODIMENT Figs. 1, 2 and 3 show a part of a housing 11 on a hydraulic drilling machine. In the housing 11 a percussion piston 1 is arranged in a more or less cylindrical space. The piston 1 moves back and forth and strikes a neck adapter (not shown) and thus transmits impact energy to a rock via one or more of the drill rods (not shown) and a drill bit (not shown). The piston has two booms which are drive areas for hydraulic pressure from a hydraulic oil which drives the piston 1 back and forth. A piston guide 3 is arranged in the housing 11 at each end of the piston 1, so that the piston 1 always strikes straight on the neck adapter, and to prevent the booms on the piston 1 from touching the walls of the cylindrical space.
    One or more seals 6 - see Fig. 1 and Fig. 2, respectively - are arranged for sealing against the piston 1. The seal 6 is arranged on a first side of a first chamber 5 arranged in the housing 11. A first gap 12 along the piston 1 separates the seal 6 from the first chamber 5. The first chamber 5 has a connection to a return line 7 for hydraulic oil, so that the seal 6 is exposed to as low a hydraulic oil pressure as possible. In the housing 11 on a second side of the first chamber 5 there is also one or andra your second chambers 2 with high hydraulic oil pressure. The second chamber 2 is separated from the first chamber 5 by a second gap 4 which is formed along the piston 1 between piston guide 3 and piston 1.
    An alternative, but functionally similar embodiment is shown in Fig. 3 where the piston guide 3 extends all the way to the seal 6 and the drained first chamber 5 is arranged in the piston guide. A passage 13 in the piston guide 3 is arranged for the connection of the first chamber 5 with the return line 7.
    The idea is that hydraulic oil coming from the second chamber 2 with high hydraulic oil pressure should be drained out via the return line 7, without damaging the seal 6. But in the second gap 4 between piston 1 and piston guide 3, the pressure difference between the second chamber 2 with high hydraulic oil pressure and the drained first chamber 5 to drive the hydraulic oil in the longitudinal direction of the second gap 4. In the case where the piston 1 has a speed in the same direction as the hydraulic oil is driven by the pressure, the speed and amount of oil become large. This hydraulic oil flows out at high speed in a film along the surface of the piston 1 and hits the seal 6. The hydraulic oil causes erosion there, which shortens the life of the seal 6 and partly lifts the seal 6, which causes leakage.
    In the cases where the piston seal comprises two seals 6 in series, Fig. 2. in these cases a pressure build-up is obtained between the seals 6, which causes the inner seal 6 to tip over and the outer seal 6 to extrude along the surface of the piston 1. Thus, the entire sealing combination is damaged.
    Fig. 4 shows a first embodiment of the invention which aims to reduce the amount and speed of the oil film which flows out along the piston 1 and hits the seal 6, so that the load on the seal 6 is reduced. A third chamber 8 is arranged in the piston guide 3. A third gap 9 is arranged along the piston 1 between the third chamber 8 and the first chamber 5. In addition, a first passage 14 is arranged at another place between the third chamber 8 and the first chamber. 5. The first passage 14 may e.g. 10 15 20 25 30 5 include one or fl your holes. If the first passage 14 is larger than the third gap 9, then the hydraulic oil flows freely through the first passage 14. Preferably, the cross-sectional area in the direction of the first passage 14 is at least twice the cross-sectional area of the second gap 4.
    The fact that the hydraulic oil flows freely through the first passage 14 means that the hydraulic oil pressure in the third chamber 8 will be approximately the same as in the first chamber 5. There will thus be a negligible pressure gradient which drives hydraulic oil through the third column 9. Thus most hydraulic oil is passed through the first passage 14 into the first chamber 5 and out via the return line 7. As a result, most of the hydraulic oil flowing at high speed through the second gap 4 will not hit the seal 6, whereby the load on the seal 6 decreases.
    Figure 5 shows a functionally similar embodiment where a separate bushing 10 is arranged between the piston guide 3 and the wall of the first chamber 5. The first passage 8 can then instead comprise first recesses 8 in the piston guide 3, which first recesses 8 abut against the bushing 10. The first recesses 8 can alternatively be arranged in the bushing 10 and abut against the piston guide 3.
    Furthermore, the bushing 10 has a second passage 15 for connecting the first chamber 5 to the return line 7. The second passage may comprise second recesses 15 which abut against the wall of the first chamber 5.
    Figure 6 shows another functionally similar embodiment where the bushing 10 also contains a fourth chamber 16 for the seal 6. In this case, the second passage 15 suitably comprises holes instead. An alternative is not to have a separate bushing 10, but that the piston guide 3 extends all the way and comprises both passages 14, 15 and the fourth chamber 16. Both passages 14, 15 then suitably comprise holes.
    The height of the third column 9 should be approximately 0.5-10 times the height of the second column 4. Preferably, the second column 4 and the third column 5 are equally high. If the height of the third gap 9 is too small, then wear will occur in the third gap 9. If the height of the third gap 9 on the other hand is too large, too much hydraulic oil will flow that way. The latter, however, is a minor problem given that the pressure gradient across the ends of the third gap 9 is low and there is therefore a larger span where the invention operates.
    The length of the third gap 9 is suitably about 50-500 times the gap height of the second gap 4. If the length of the third slot 9 is too short, then too little power is obtained and if the length of the third slot 9 is too long, it adversely affects the length of the entire drilling machine.
    In all examples a percussion piston has been specified, the solution of course also works on other movable devices, e.g. damping pistons. In the same way, it is not necessary to arrange the third chamber 8 in the piston guide 3, but the third chamber 8 can be arranged directly in the wall of the housing 11 or in another device attached to the housing 11.
    The figures show examples with a seal 6, but the invention provides the same protection for two or more seals 6 in tandem, compare e.g. Fig. 2. Sensitive parts other than seals can also be protected in the same way.
    To increase the effect, it is also possible to have several third chambers 8 with third columns 9 in series.
    The invention works not only in drilling machines, but also e.g. in hydraulic hammers and other similar devices with similar problems.
    The invention is of course not limited to the example described above, but can be modified within the scope of the appended claims.
    权利要求:
    Claims (10)
    [1]
    A hydraulic striking device comprising a movable device (1) in a housing (11), in which housing (11) is arranged at the movable device (1): a first chamber (5) connected to a hydraulic oil return line (7), a seal (6) on a first side of the first chamber (5), separated from the first chamber (5) by a first gap (12) along the movable device (1), and a second chamber (2) with higher hydraulic oil pressure than the first chamber (5) and arranged on a second side of the first chamber (5), separated from the first chamber (5) by a second gap (4) along the movable device (1 ), characterized in that a third chamber (8) is fixedly arranged between the second gap (4) and the first chamber (5) and that the third chamber (8) is connected to the first chamber (5) partly via a first passage (14) and partly via a third column (9) along the movable device (1).
    [2]
    Hydraulic striking device according to claim 1, characterized in that the movable device (1) is a piston, e.g. a percussion piston or a damping piston.
    [3]
    Hydraulic striking device according to Claim 1 or 2, characterized in that the third chamber (8) is arranged in a piston guide (3) arranged in the housing (11).
    [4]
    Hydraulic striking device according to claim 3, characterized in that the piston guide further comprises a fourth chamber (16) for the seal (6).
    [5]
    Hydraulic striking device according to claim 1 or 2, characterized in that the third chamber (8) is arranged between a piston guide (3) arranged in the housing (11) and a bushing (10) arranged in the housing (11).
    [6]
    Hydraulic striking device according to claim 5, characterized in that the bushing (10) further comprises a fourth chamber (16) for the seal (6).
    [7]
    Hydraulic striking device according to one of Claims 1 to 6, characterized in that the height of the third gap (9) is 0.5-10 times the height of the second gap (4). 10 15 8
    [8]
    Hydraulic striking device according to one of Claims 1 to 7, characterized in that the length of the third gap (9) is 50-500 times the height of the second gap (4).
    [9]
    Hydraulic striking device according to one of Claims 1 to 8, characterized in that the cross-sectional area of the first passage is at least twice the cross-sectional area of the second gap (4).
    [10]
    Hydraulic striking device according to one of Claims 1 to 9, characterized in that the hydraulic striking device is a hydraulic drilling machine or a hydraulic hammer. 11) Piston guide (3) for mounting in a housing (11) to a drilling machine with a piston (1), so that a second gap (4) is formed between the piston guide (3) and the piston (1) in the side of the piston (1) and between a first chamber (8) and a second chamber (2) with a higher hydraulic oil pressure than the first chamber (5) in the longitudinal direction of the piston (1), characterized in that the piston guide (3) comprises a third chamber (8) arranged to be fixed during assembly arranged between the second column (4) and the first chamber (5), so that the third chamber (8) is connected to the first chamber (5) partly via a first passage (8) and partly via a third column (9) along the piston (1). Drilling rig with a hydraulic drilling machine according to one of claims 1 to 10.
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    同族专利:
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1050316A|SE534794C2|2010-04-01|2010-04-01|Hydraulic striking device, piston control, and drilling rig|SE1050316A| SE534794C2|2010-04-01|2010-04-01|Hydraulic striking device, piston control, and drilling rig|
    JP2013502525A| JP5843242B2|2010-04-01|2011-03-22|Hydraulic impact device, piston guide and excavator|
    AU2011233729A| AU2011233729B2|2010-04-01|2011-03-22|Hydraulic percussive arrangement, piston guide and drilling rig|
    EP11763133.3A| EP2552651B1|2010-04-01|2011-03-22|Hydraulic percussive arrangement and drilling rig|
    CA2792964A| CA2792964C|2010-04-01|2011-03-22|Hydraulic percussive arrangement, piston guide and drilling rig|
    PCT/SE2011/050313| WO2011123020A1|2010-04-01|2011-03-22|Hydraulic percussive arrangement, piston guide and drilling rig|
    US13/261,412| US9132540B2|2010-04-01|2011-03-22|Hydraulic percussive arrangement, piston guide and drilling rig|
    CN201180017552.8A| CN102858498B|2010-04-01|2011-03-22|Hydraulic percussive arrangement, piston guide and drilling rig|
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