EP1554085B1 - Shank for a rock drill, rock drill and method for rock drilling - Google Patents

Shank for a rock drill, rock drill and method for rock drilling Download PDF

Info

Publication number
EP1554085B1
EP1554085B1 EP03758158A EP03758158A EP1554085B1 EP 1554085 B1 EP1554085 B1 EP 1554085B1 EP 03758158 A EP03758158 A EP 03758158A EP 03758158 A EP03758158 A EP 03758158A EP 1554085 B1 EP1554085 B1 EP 1554085B1
Authority
EP
European Patent Office
Prior art keywords
shank
rotating
rock
percussion
elements
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
EP03758158A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1554085A1 (en
Inventor
Ari Kotala
Pekka Saukko
Aimo Helin
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.)
Sandvik Mining and Construction Oy
Original Assignee
Sandvik Mining and Construction Oy
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 Sandvik Mining and Construction Oy filed Critical Sandvik Mining and Construction Oy
Publication of EP1554085A1 publication Critical patent/EP1554085A1/en
Application granted granted Critical
Publication of EP1554085B1 publication Critical patent/EP1554085B1/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
    • E21B6/02—Drives for drilling with combined rotary and percussive action the rotation being continuous
    • E21B6/04—Separate drives for percussion and rotation

Definitions

  • the invention relates to a rock drill shank according to the preamble of claim 1.
  • the invention further relates to a rock drill according to the preamble of claim 8.
  • the invention further relates to a method for rock drilling, according to the preamble of claim 10.
  • a rock drill shank, a rock drill and a method for rock drilling are already known from document EP-A-0 634 559 .
  • a typical rock drill comprises a shank, percussion device and rotating device.
  • a tool can be fastened to the shank, to which rotation torque is transmitted from the rotating device by means of the shank and impact pulses are transmitted from the percussion device.
  • the percussion device generally comprises a reciprocating percussion piston arranged to provide impacts to an impact surface located outermost at the back end of the shank.
  • This type of drill has a certain minimum length and, in practice, it cannot be made shorter than the minimum length. The minimum length is determined by the length of the percussion piston and shank, the stroke length of the percussion piston and the remaining structure of the drill, such as the end covers.
  • the length of the drill cannot be shortened without shortening the length of the percussion piston and shank. If the percussion piston is made very short, it is no longer possible to provide therewith the impact pulses needed to break rock, and the performance of the drill is substantially reduced.
  • the shank too, should have a certain length so that tools can be firmly fastened to it and that it can be firmly supported to the body of the drill.
  • the rotation torque required to rotate the shank should be transmitted to it.
  • the stroke of the percussion piston also cannot be shortened very much without a harmful effect on the impact pulses transmitted to the shank.
  • the shank of the invention is disclosed in claim 1.
  • rock drill of the invention is disclosed in claim 8.
  • the impact surface of the shank is formed at a distance from the back end of the shank, i.e. the outermost end on the percussion device side. Further, the percussion element, which is arranged to transmit the impact pulses from the percussion device to the shank, and the back end of the shank are arranged to overlap at least partly.
  • the percussion element of the percussion device and the shank overlap at least partly, the entity formed by the percussion device and shank can be relatively short in length.
  • the percussion device and its percussion element can be designed so as to provide impact pulses of sufficient strength.
  • the shank can be dimensioned such that it can be well supported to the body. With the rotating elements arranged at the second end of the shank, there is a free section on the arm of the shank, whereby it is easier to arrange the support of the shank. Further, it is easier to arrange the supply of a flushing medium and the seaiing arrangements it requires in such a construction.
  • the idea of a preferred embodiment of the invention is that the rotating elements of the shank are formed on the outer rim of the second-end area of the shank.
  • the impact surface in turn resides on the centre axis of the shank.
  • the second end of the shank is cuplike in shape.
  • the impact surface forms the bottom of the cuplike section.
  • the percussion element then overlaps the rotating elements at least when transmitting the impact pulse.
  • Figure 1 shows a conventional rock drill having a percussion piston 1 arranged to strike an impact surface 3 at the back end of a shank 2, forming impact pulses.
  • the shank 2 transmits the impact pulses on to a tool 4 fastened to the shank 2 and on through a drill bit or the like to the rock being drilled.
  • the shank 2 is connected with rotating elements 5 to a rotating device 6 in such a manner that the shank 2 and tool 4 can be rotated around their longitudinal axes.
  • the conventional drill has a minimum length L min that is formed of the lengths of the percussion piston 1 and shank 2 arranged consecutively, the stroke length L per of the percussion piston 1 and further, the casing and body structure of the rock drill; in this case, the thickness L 1 of an end cover 7.
  • FIG. 2 shows a rock drill 21 according to a preferred embodiment of the invention.
  • the back end of the shank 2 is cuplike, whereby the percussion piston 1 does not strike the outermost end of the shank 2 but the impact surface 8 that is at a distance L 2 from the back end of the shank 2.
  • the percussion piston 1 and the shank 2 are partly inside each other either during the stroke only or during the entire percussion cycle.
  • the rotating elements 5 are formed on the outer rim of the cuplike section of the shank 2, whereby there remains a relatively long free section on the arm 18 of the shank 2, to which the flushing medium channel 9, seals 10 and shank 2 bearings 11 can be arranged.
  • the minimum length L min of the drill can be shorter than in the known drills.
  • the body 22 of the drill 21 is marked with a dashed line in the figure. Control elements and pressure medium channels belonging to the percussion device 23 are not shown in Figure 2 for the sake of clarity.
  • Figure 3 is a sectional view and Figure 4 a side view of a shank 2 of a preferred embodiment of the invention that comprises a first end 12, i.e. front end, and a second end 13, i.e. back end.
  • the front end 12 has connecting elements 14, such as threads, by means of which tools 4 can be fastened to the drill. Instead of threads, it is naturally possible to use other connection elements suitable for the purpose.
  • the back end 13 of the shank 2 is cuplike in shape and consequently has longitudinal edges 15 that form a circular cross-section at the back end 13 of the shank 2.
  • the impact surface 8 is a transverse surface with respect to the longitudinal axis of the shank 2 and resides at a distance L 2 from the outermost surface 16 of the back end 13 of the shank 2, thus forming the bottom of the cuplike section.
  • the impact surface 8 is located on the longitudinal axis of the shank 2.
  • the rotating elements 5 can comprise gearing on the outer rim of the edges 15, to which the rotating device 6 can be geared through a gear wheel. It is clear that instead of gearing, it is possible to use any other suitable transmission elements for transmitting rotating torque to the shank 2.
  • the shank 2 can have at least one flushing medium channel 9, the first end of which extends to the connection surface between the shank 2 and tool 4 and the second end 17 of the channel 9 extends to the arm 18 of the shank 2. Flushing medium can then be supplied through the shank 2 to a second flushing medium channel in the tool 4. On the arm 18 of the shank 2, there is space for suitable collars or surfaces 19 and 20 for seals 10 and bearings 11.
  • Figures 5 and 6 show a shank 2 having female connection elements 14 at its first end 12.
  • the tool 4 is then arranged to the shank 2 by pushing it partly inside the connection elements 14 of the shank 2.
  • the tool 4 may have an angular connection head, for instance hexagonal, and the shank 2 may have a recess corresponding to the cross-profile of said connection head.
  • the shank 2 and tool 4 then connect to each other by shape.
  • the connection can yet be secured in the longitudinal direction of the tool by means of a suitable screw, pin, wedge or another fastening element.
  • the cross-profile of the shank recess and the connection head of the tool 4 can also be some other non-circular shape, such as oval. It is naturally possible to have an internal thread in the connection elements 14 of the shank 2, to which a threaded pinlike connection head of the tool 4 can be arranged.
  • Figure 7 further shows in a very simplified manner the cross-section of the structure of a rock drill.
  • a rock drill in such a manner that the percussion piston 1 or a corresponding percussion element surrounds the back end 13 of the shank 2 to a predefined extent.
  • the front end of the percussion element 1 can then be cuplike and the impact surface 8 of the shank 2 can be formed to a collar 25 in the shank 2, at a distance L 2 from the back end of the shank 2.
  • Rotating elements 5 can be formed on the outer rim of the collar 25.
  • the percussion element also refers to other components generating an impact pulse than the reciprocating percussion piston shown in Figures 1 to 7 . It can thus be said that the percussion element is a part of the percussion device that is arranged to transmit the impact pulse provided by the percussion device in one way or another to the impact surface of the shank.
  • the rock drill does not comprise the conventional type of pressure medium-operated or electrically operated rotating device, but the shank and drilling tool are rotated around their longitudinal axes for instance by transforming part of the impact pulse energy to rotation torque.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
EP03758158A 2002-10-24 2003-10-22 Shank for a rock drill, rock drill and method for rock drilling Expired - Lifetime EP1554085B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI20021898A FI115614B (fi) 2002-10-24 2002-10-24 Järjestely kallioporakoneessa
FI20021898 2002-10-24
PCT/FI2003/000785 WO2004037493A1 (en) 2002-10-24 2003-10-22 Rotating and percussive shank for a rock drill machine with an impact surface a distance from its back end

Publications (2)

Publication Number Publication Date
EP1554085A1 EP1554085A1 (en) 2005-07-20
EP1554085B1 true EP1554085B1 (en) 2010-03-31

Family

ID=8564813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03758158A Expired - Lifetime EP1554085B1 (en) 2002-10-24 2003-10-22 Shank for a rock drill, rock drill and method for rock drilling

Country Status (8)

Country Link
EP (1) EP1554085B1 (fi)
AT (1) ATE462536T1 (fi)
AU (1) AU2003274180B2 (fi)
DE (1) DE60331937D1 (fi)
FI (1) FI115614B (fi)
PL (1) PL208131B1 (fi)
WO (1) WO2004037493A1 (fi)
ZA (1) ZA200210221B (fi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE531658C2 (sv) * 2006-10-02 2009-06-23 Atlas Copco Rock Drills Ab Slagverk jämte bergborrmaskin och bergborrigg

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI91499C (fi) * 1990-11-30 1994-07-11 Valto Ilomaeki Menetelmä iskutehokkuuden varmistamiseksi ja säätämiseksi iskukoneessa, iskukoneen käyttötapa tunnelin poraamiseen ja iskukone
SE501364C2 (sv) * 1993-07-12 1995-01-23 Atlas Copco Rocktech Ab Vätskedriven sänkborrmaskin utformad med en uppslagare
FI112450B (fi) * 2000-10-09 2003-12-15 Sandvik Tamrock Oy Rikotuslaite ja työkalu

Also Published As

Publication number Publication date
PL208131B1 (pl) 2011-03-31
FI115614B (fi) 2005-06-15
WO2004037493A1 (en) 2004-05-06
AU2003274180B2 (en) 2008-05-15
PL375028A1 (en) 2005-11-14
ZA200210221B (en) 2004-01-28
ATE462536T1 (de) 2010-04-15
FI20021898A (fi) 2004-04-25
AU2003274180A1 (en) 2004-05-13
DE60331937D1 (de) 2010-05-12
EP1554085A1 (en) 2005-07-20
FI20021898A0 (fi) 2002-10-24

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