US3921731A - Hydraulic impact device - Google Patents

Hydraulic impact device Download PDF

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Publication number
US3921731A
US3921731A US490985A US49098574A US3921731A US 3921731 A US3921731 A US 3921731A US 490985 A US490985 A US 490985A US 49098574 A US49098574 A US 49098574A US 3921731 A US3921731 A US 3921731A
Authority
US
United States
Prior art keywords
pressure air
impact
housing
hydraulic
chuck bushing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US490985A
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English (en)
Inventor
Carl Gosta Bernhard Ekwall
Sven Ingemar Johansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atlas Copco AB
Original Assignee
Atlas Copco AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atlas Copco AB filed Critical Atlas Copco AB
Application granted granted Critical
Publication of US3921731A publication Critical patent/US3921731A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B6/00—Drives for drilling with combined rotary and percussive action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
    • B25D17/084—Rotating chucks or sockets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
    • B25D17/26—Lubricating
    • B25D17/265—Lubricating the lubricant being entrained to the machine parts by the driving fluid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/03—Lubrication

Definitions

  • a further problem concerning hydraulic impact devices is that the parts which are provided with bearing surfaces, for instance the chuck bushing, and which are located in the non-hydraulic section are insufficiently lubricated and cooled. As a consequence thereof, an unacceptable hard wear occurs resulting in too large clearances and a gathering of wear products.
  • One object of the invention is to effectively prevent dust and similar particles outside the machine as well as flush medium, from the flush medium supply means from getting into contact with the hydraulic system and other sensitive means of the machine.
  • Another object of the invention is to accomplish a desirable lubrication of the mechanical means, like tool rotating and recoil damping means, which are located within the non-hydraulic section of the device.
  • Still another object of the present invention is to accomplish cooling of the non-hydraulic section of the device as well as removing of wear products therefrom.
  • the disclosed rock drill comprises a housing 1 which includes an hydraulic fluid section 2 and non-hydraulic section 3, e.g. the section which is sealed off from hydraulic fluid.
  • An impact piston 4 extends from the hydraulic fluid section 2, wherein it is reciprocately powered, into the non-hydraulic section 3.
  • the two main sections of the housing 1 are separated by a packing device which surrounds the impact piston 4 and which comprises a clearance seal ring 6 and a couple of resilient packing rings 7. Between the clearance seal ring 6 and the packing rings 7 there is a drain compartment 9 provided with outlet passages 8 through which hydraulic fluid which might leak across the clearance seal ring 6 is drained.
  • the non-hydraulic section 3 of the housing 1 accomodates the rear end part of a drill stem adapter 11 which is provided with an axial flush medium passage 10.
  • the housing is provided with a tool aperture 12 at its front end.
  • this section of the housing 1 contains a chuck bushing 13 which surrounds the drill stem adapter 11.
  • the chuck bushing is rigidly mounted in a socket wheel 14 which is rotatably powered by a motor 16 through a gear 15.
  • the socket wheel 14 is journalled in the housing 1 by means of two roller bearings l7, l8 and is provided with an outer gear ring which forms a part of the gear 15.
  • the drill stem adapter is provided with a widened portion 19 the outer contour of which is adapted to that of the aperture in the chuck bushing 13.
  • an abutment sleeve 21 for transferring advance forces applied upon the housing to the drill stem adapter.
  • This sleeve 21 is axially displaceable relative to the socket wheel 14 which sleeve is biased toward its forward-most position by means of a spring 22.
  • the abutment sleeve 21 abuts against the rear end of the chuck bushing 13.
  • the spring 22 rests against a thrust ring 23 which is rotatably journalled within the housing 1 by means of a roller bearing 24 of the axial thrust type.
  • the forward end of the abutment sleeve 21 is arranged to rest against the widened portion 19 of the drill stem adapter 11 for transferring advance forces acting upon the rock drill to the drill stem via the spring 22 and the thrust ring 23.
  • the spring 22 is intended to absorb recoil impact from the drill stem and thereby protect the impact device from undesirable strains.
  • the impact damping effect of the spring 22 enables use of a roller bearing as axial thrust bearing 24.
  • the housing 1 is provided with two seal rings 26, 27 which are arranged to cooperate with the outer periphery of the socket wheel 14 and which enclose the bearings 19 and 18 and the gear 15. Thereby, this part of the housing is separated from the rest of the nonhydraulic section 3 of the housing 1.
  • the bearings 19 and 18 and the gear 15 are lubricated with grease.
  • the impact device comprises a flush medium block 28 situated in front of the chuck bushing 13 and intended for supplying flush medium, for instance water, to the flush medium passage 10 of the drill stem adapter 11.
  • the flush medium block 28 contains a flush medium chamber 29 which surrounds the drill stem adapter 11.
  • An annular groove 30 is formed on the outer peripheri of the flush medium block 28 which groove communicates with the chamber 29.
  • the annular groove 30 also communicates with a flush medium supply conduit 32 through a passage 33 in the housing 1.
  • the flush medium chamber 29 is sealed off by means of two packing rings 34, 35 cooperating with the adapter 1 1 whereas the annular groove 30 is sealed off by means of two packing rings 36 and 37 cooperating with the housing 1.
  • a support sleeve 40 is rotatably journalled in the housing 1 by means of a bearing 41.
  • the support sleeve 40 is arranged to form a radial support for the drill stem adapter 11 during drilling.
  • the non-hydraulic section 3 of the housing 1 is connected to a pressure air source through a conduit 42 and an inlet passage 43.
  • the conduit 42 is connected to a metering device 50 for adding lubricating oil to the pressure air.
  • the inlet passage, 43 is connected to two inlet openings 44 and 45 in the recoil damping part of the housing 1 and to a passage 46 through which pressure air is conducted to the rear end of the support sleeve 40.
  • the inlet opening 44 is located adjacent the axial thrust bearing 24 and the inlet opening 45 adjacent the abutment sleeve 21.
  • the housing 1 is also provided with two pressure air outlets. One of these is constituted by an annular space formed between the housing 1 and the adapter 11 within the tool aperture 12.
  • the other air outlet is constituted by a passage 48 which interconnects the atmosphere and a drain chamber 49. The latter is located in the rear part of the flush medium block 28 and surrounds the drill stem 11 just in front of the chuck bushing 13.
  • This air passage arrangement enables establishing of two separate pressure air barriers the objects of which are to obtain a seal relative to the ambient as, well as clean blowing, lubricating and cooling of the nonhydraulic section 3 of the housing 1.
  • the forward-most of the pressure air barriers is constituted by an air flow which extends from the passage 46 through the axial clearance between the support sleeve 40 and the flush medium block 28, and leaves the housing through the support sleeve 40 and the tool aperture 12.
  • a forwardly directed, annular air flow is accomplished which air flow acts as a seal around the drill stern adapter 11 and prevents effectively dust and other strange particles from entering the housing 1.
  • this air flow barrier there is also accomplished lubrication and cooling of the support sleeve 40 and the bearing 41.
  • the former may be provided with radially directed grooves at its rear end.
  • the rear pressure air barrier is constituted partly by an air flow and partly by a pressure air volume.
  • the latter is obtained in that the air flow which passes the inlet openings 44 and 45 is restricted when passing through the machine, whereby the part of the housing 1 which issituated betwen the flush medium block 28 and the hydraluic seals 6 and 7 is put under pressure.
  • This pressure air volume particles are prevented from travelling backwards through the machine and get into contact with the impact piston 4 and the seal rings 7.
  • This sealing effect is improved by a flow of pressure air passing through the outer and inner clearances of the abutment sleeve 21 and further through the inner clearance of the chuck bushing 13. This air flow leaves the housing through the drain chamber 49 and the passage 48, and accomplishes lubrication, cooling and clean blowing of all parts located within the nonhydraulic section of the housing.
  • the abutment sleeve 21 may be provided with outer and may be also inner axial grooves and the chuck bushing 13 with inner axial grooves.
  • the chuck bushing 13 may also be provided with radial grooves at its rear end.
  • the rear pressure air barrier has a very important task in protecting the impact device from leaking flush water.
  • Other, at least as important tasks are to lubricate and cool the different parts of the impact device as well as to transport wear products out of the machine.
  • a hydraulic impact device intended for rock drilling comprising:
  • a housing and an impact piston said housing being divided into a hydraulic fluid section in whichthe impact piston is reciprocately powered, and a nonhydraulic section into which the forward end of the impact piston extends;
  • a tool aperture provided in the non-hydraulic section for receiving the rear end of a drill stem or drill stem adapter
  • pressure air supply means provided in the nonhydraulic section of the housing and including means for coupling pressure air in front of and behind the flush medium supply chamber establishing two pressure air barriers in the non-hydraulic section, one in front of and one behind the flush medium supply chamber relative to the impact direc-' tron.
  • Impact device comprising a metering device coupling a pressure air source to said pressure air supply means, said metering device supply; ing lubricating oil to the pressure air.
  • said pressure air supply means comprises passage means in i ber and the hydraulic fluid section; and said pressure air supply means includes at least one pressure air inlet opening in the housing behind the chuck bushing and an air outlet opening in the housing in front of the chuck bushing, relating to the impact direction, the
  • the rear pressure air barrier is comprised of an air flow extending through said chuck bushing.
  • Impact device comprising a metering device coupling a pressure air source to said pressure air supply means, said metering device supplying lubricating oil to the pressure air.
  • Impact device comprising an annular space communicating with the tool aperture and wherein said pressure air supply means includes an air outlet opening in the housing in front of the chuck bushing, relating to the impact direction, the chuck bushing permitting an air flow therethrough, whereby the rear pressure air barrier is comprised of an air flow extending through said chuck bushing.
  • Impact device comprising a metering device coupling a pressure air source to said pressure air supply means, said metering device supplying lubricating oil to the pressure air.

Landscapes

  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Percussive Tools And Related Accessories (AREA)
US490985A 1973-08-02 1974-07-23 Hydraulic impact device Expired - Lifetime US3921731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7310634A SE391219C (sv) 1973-08-02 1973-08-02 Hydrauliskt slagverk avsett for bergborrning

Publications (1)

Publication Number Publication Date
US3921731A true US3921731A (en) 1975-11-25

Family

ID=20318164

Family Applications (1)

Application Number Title Priority Date Filing Date
US490985A Expired - Lifetime US3921731A (en) 1973-08-02 1974-07-23 Hydraulic impact device

Country Status (11)

Country Link
US (1) US3921731A (de)
JP (1) JPS5410323B2 (de)
AT (1) AT333226B (de)
CA (1) CA1015739A (de)
FI (1) FI66461B (de)
FR (1) FR2239585B1 (de)
GB (1) GB1449758A (de)
IT (1) IT1016456B (de)
PL (1) PL90308B1 (de)
SE (1) SE391219C (de)
ZA (1) ZA744472B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333538A (en) * 1978-10-06 1982-06-08 Atlas Copco Aktiebolag Pneumatic drill lubricator
US4576240A (en) * 1981-10-19 1986-03-18 Kabushiki Kaisha Komatsu Seisakusho Hydraulic impact device
US4815546A (en) * 1987-04-02 1989-03-28 W-N Apache Corporation Top head drive assembly with axially movable quill
US5662517A (en) * 1994-12-15 1997-09-02 Joisten & Kettenbaum Gmbh & Co. Joke Kg Compressed-air-driven metal working machine
FR2888138A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888137A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888139A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888136A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888140A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
CN102373881A (zh) * 2011-09-29 2012-03-14 河北宏远液压机械有限公司 液压凿岩机液压承冲机构
US20120283740A1 (en) * 2011-05-06 2012-11-08 Aesculap Ag Surgical handpiece
WO2014209197A1 (en) 2013-06-25 2014-12-31 Atlas Copco Rock Drills Ab Device and method related to lubrication of components in a rock drilling machine and rock drilling machine
US20150285014A1 (en) * 2012-11-21 2015-10-08 Atlas Copco Rock Drills Ab Device Relating To A Flushing Head For A Rock Drilling Machine And Rock Drilling Machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE392947B (sv) * 1976-05-19 1977-04-25 Linden Alimak Ab Anordning vid hydraulisk bergborrmaskin for att forhindra intrengande av fremmande partiklar i borrmaskinen
GB8409185D0 (en) * 1984-04-09 1984-05-16 Rhl Hydraulics Ltd Power tool

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US651487A (en) * 1899-04-29 1900-06-12 John George Leyner Rock-drilling engine.
US892082A (en) * 1906-04-17 1908-06-30 Ingersoll Rand Co Rock-drilling machine.
US3028771A (en) * 1958-06-23 1962-04-10 Boyar Schultz Corp Revolving deep driller
US3774700A (en) * 1971-03-08 1973-11-27 Hughes Tool Co Thrust bearing for impact tool and other rock penetrating tools
US3797584A (en) * 1972-03-31 1974-03-19 E Bailey Striking bar

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3620312A (en) * 1969-05-22 1971-11-16 Ingersoll Rand Co Rock drill

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US651487A (en) * 1899-04-29 1900-06-12 John George Leyner Rock-drilling engine.
US892082A (en) * 1906-04-17 1908-06-30 Ingersoll Rand Co Rock-drilling machine.
US3028771A (en) * 1958-06-23 1962-04-10 Boyar Schultz Corp Revolving deep driller
US3774700A (en) * 1971-03-08 1973-11-27 Hughes Tool Co Thrust bearing for impact tool and other rock penetrating tools
US3797584A (en) * 1972-03-31 1974-03-19 E Bailey Striking bar

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4333538A (en) * 1978-10-06 1982-06-08 Atlas Copco Aktiebolag Pneumatic drill lubricator
US4576240A (en) * 1981-10-19 1986-03-18 Kabushiki Kaisha Komatsu Seisakusho Hydraulic impact device
US4815546A (en) * 1987-04-02 1989-03-28 W-N Apache Corporation Top head drive assembly with axially movable quill
US5662517A (en) * 1994-12-15 1997-09-02 Joisten & Kettenbaum Gmbh & Co. Joke Kg Compressed-air-driven metal working machine
WO2007006936A1 (fr) * 2005-07-08 2007-01-18 Les Outils Pneumatiques Globe Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
WO2007006933A1 (fr) * 2005-07-08 2007-01-18 Les Outils Pneumatiques Globe Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888139A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888136A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888140A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
WO2007006934A1 (fr) * 2005-07-08 2007-01-18 Les Outils Pneumatiques Globe Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
WO2007006932A1 (fr) * 2005-07-08 2007-01-18 Les Outils Pneumatiques Globe Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
WO2007006935A1 (fr) * 2005-07-08 2007-01-18 Les Outils Pneumatiques Globe Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888138A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
FR2888137A1 (fr) * 2005-07-08 2007-01-12 Outils Pneumatiques Globe Sa Ensemble pneumatique pour installation de dessablage des noyaux de fonderie
US20120283740A1 (en) * 2011-05-06 2012-11-08 Aesculap Ag Surgical handpiece
CN102373881A (zh) * 2011-09-29 2012-03-14 河北宏远液压机械有限公司 液压凿岩机液压承冲机构
CN102373881B (zh) * 2011-09-29 2013-12-11 河北宏远液压机械有限公司 液压凿岩机液压承冲机构
US20150285014A1 (en) * 2012-11-21 2015-10-08 Atlas Copco Rock Drills Ab Device Relating To A Flushing Head For A Rock Drilling Machine And Rock Drilling Machine
US10145189B2 (en) * 2012-11-21 2018-12-04 Epiroc Rock Drills Aktiebolag Device relating to a flushing head for a rock drilling machine and rock drilling machine
WO2014209197A1 (en) 2013-06-25 2014-12-31 Atlas Copco Rock Drills Ab Device and method related to lubrication of components in a rock drilling machine and rock drilling machine
CN105324218A (zh) * 2013-06-25 2016-02-10 阿特拉斯·科普柯凿岩设备有限公司 与凿岩机中的部件的润滑相关的装置和方法及凿岩机
EP3013533A4 (de) * 2013-06-25 2017-03-01 Atlas Copco Rock Drills AB Vorrichtung und verfahren im zusammenhang mit der schmierung von komponenten in einer gesteinsbohrmaschine und gesteinsbohrmaschine
CN105324218B (zh) * 2013-06-25 2017-04-26 阿特拉斯·科普柯凿岩设备有限公司 与凿岩机中的部件的润滑相关的装置和方法及凿岩机
US9784039B2 (en) 2013-06-25 2017-10-10 Atlas Copco Rock Drills Ab Device and method related to lubrication of components in a rock drilling machine and rock drilling machine

Also Published As

Publication number Publication date
AT333226B (de) 1976-11-10
SE391219C (sv) 1985-08-22
DE2435581B2 (de) 1976-01-22
ZA744472B (en) 1975-08-27
SE391219B (sv) 1977-02-07
FR2239585B1 (de) 1982-04-16
SE7310634L (de) 1975-02-03
ATA615974A (de) 1976-03-15
FR2239585A1 (de) 1975-02-28
CA1015739A (en) 1977-08-16
FI222974A (de) 1975-02-03
AU7173974A (en) 1976-01-29
DE2435581A1 (de) 1975-02-20
IT1016456B (it) 1977-05-30
GB1449758A (en) 1976-09-15
FI66461B (fi) 1984-06-29
PL90308B1 (de) 1977-01-31
JPS5410323B2 (de) 1979-05-04
JPS5039601A (de) 1975-04-11

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