US20160040482A1 - Roller cutter with improved sealing - Google Patents

Roller cutter with improved sealing Download PDF

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Publication number
US20160040482A1
US20160040482A1 US14/778,630 US201414778630A US2016040482A1 US 20160040482 A1 US20160040482 A1 US 20160040482A1 US 201414778630 A US201414778630 A US 201414778630A US 2016040482 A1 US2016040482 A1 US 2016040482A1
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US
United States
Prior art keywords
roller cutter
hub
seal retainer
cutter according
recess
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.)
Abandoned
Application number
US14/778,630
Other languages
English (en)
Inventor
Joona LOIKKANEN
Stig-Ake Brolund
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 Intellectual Property AB
Original Assignee
Sandvik Intellectual Property 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
Family has litigation
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Application filed by Sandvik Intellectual Property AB filed Critical Sandvik Intellectual Property AB
Assigned to SANDVIK INTELLECTUAL PROPERTY AB reassignment SANDVIK INTELLECTUAL PROPERTY AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Loikkanen, Joona, BROLUND, STIG-AKE
Publication of US20160040482A1 publication Critical patent/US20160040482A1/en
Abandoned 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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/22—Roller bits characterised by bearing, lubrication or sealing details
    • E21B10/25—Roller bits characterised by bearing, lubrication or sealing details characterised by sealing details
    • 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
    • E21B10/00—Drill bits
    • E21B10/08—Roller bits
    • E21B10/10—Roller bits with roller axle supported at both ends
    • E21B2010/225—

Definitions

  • the present invention relates to a roller cutter for a drill head for rotary boring of a front of earth and rock formations according to the preamble of the independent claim.
  • a roller cutter comprising an improved sealing is addressed in U.S. Pat. No. 5,984,024. It shows sealing means held in position by a seal retainer.
  • the roller cutter also comprises relief holes having conical plugs which are removed in order to refill the roller cutter with lubricant, such as grease or oil.
  • lubricant such as grease or oil.
  • One object of the present invention is to provide a roller cutter with improved sealing compared to existing roller cutters.
  • a roller cutter having a centre line comprising: a hub provided with rows of crushing members, at least one crushing member having its longitudinal axis at an angle relative to a normal to the centre line, said hub being rotatable in relation to a shaft having shaft spigots, the roller cutter being provided with at least one seal retainer arranged at an axial end of the hub in order to hold sealing means in position, wherein the hub comprises at least one circumferential recess positioned axially inward relative to a radially inward projecting flange in the hub.
  • FIG. 1 schematically shows an axial cross-section through a raise-boring head having roller cutters according to the invention.
  • FIG. 2 schematically shows a roller cutter according to the present invention as well as a saddle in side view.
  • FIG. 3A schematically shows the roller cutter according to the present invention in a partial cross-section.
  • FIG. 3B schematically shows an enlarged section according to FIG. 3A .
  • FIG. 1 illustrates how a pilot hole 11 , which in a known way is pre-drilled between an upper and a lower, not shown, level in a mine is reamed by means of a drill head designated 10 .
  • the drill head 10 is connected to a drive stem 12 by means of which the drill head is rotated and is pressed against a ring-shaped surface 13 that surrounds the pilot hole 11 .
  • the surface 13 thus, defines the face of the earth formation.
  • the invention relates to earth boring in general, but is primarily intended for raise boring. At raise boring, a distance is drilled between the lower and the upper level in a mine, and then the pilot hole is reamed by means of a drill head having a large diameter.
  • the drill head 10 comprises a body 16 and a plurality of rollers or cutters 14 , which are rotatably mounted on the body in fasteners or saddles 15 .
  • Each roller cutter comprises circumferential rows of buttons or crushing members of cemented carbide in a known way.
  • the saddles 15 are mounted on the body 16 .
  • the drive stem 12 is connected to the body 16 .
  • the body 16 has a mounting surface 17 on which the saddles 15 are carried.
  • FIG. 2 illustrates how the saddle 15 comprises a bottom surface 18 , which is intended to be connected, for instance by screwing or welding, to the mounting surface 17 .
  • the saddle 15 comprises two legs 19 , 20 , between which the roller cutter is mounted.
  • the legs 19 , 20 are, at the ends thereof facing away from the bottom surface 18 formed with arms 21 .
  • the arms 21 have different lengths from the bottom surface 18 .
  • Fastening devices in the form of threaded bolts 22 and nuts 23 are intended to hold the roller cutter 14 and the saddle 15 together.
  • FIG. 3A illustrates the roller cutter having a shaft 33 with a longitudinal centre line CL.
  • Axially outward refers to a direction towards the arms 21 , and radially outward means a direction away from the centre line.
  • the ends of the shaft 33 each has a shaft spigot 34 , 35 , which is intended to abut against a support surface (not shown) in the arms 21 of the saddle 15 .
  • a hub 24 is rotatably mounted on the shaft 33 via bearing members 26 .
  • the bearing members 26 are received in circumferential grooves in the hub 24 .
  • the hub 24 is locked axially in relation to the shaft 33 by means of a lock member 28 , preferably in the form of balls, which co-operate with circumferential grooves in both the shaft 33 and the hub 24 .
  • the roller cutter 14 has inserts or crushing members 29 mounted in rows at an envelope surface of the hub 24 . At least one of the crushing members 29 has its longitudinal centre line CL 1 at an angle relative to a normal to the centre line CL of the roller cutter 14 .
  • FIG. 3B illustrates that between the axial ends of the hub 24 and the shaft 33 the cutter 14 is at at least one end, preferably both, provided with seal retainers 38 .
  • the seal retainer 38 has a maximum axial extension X.
  • the seal retainer 38 supports sealing means 37 that prevents the lubricant, such as grease or oil, from leaking out from the interior of the cutter 14 .
  • the sealing means 37 is of the type mechanical face seal, also called duo-cone seal. It comprises two O-rings 37 A and 37 B, made of a resilient material, and two seal rings 37 C and 37 D, often made of cast iron. The most radially outward surfaces of the seal rings, 37 C and 37 D, have a concave shape in order to axially fix the O-rings, 37 A and 37 B, in position.
  • the seal retainers 38 are equipped with relief holes 39 having plugs 40 mounted in said holes to prevent lubricant from leaking out through said holes 39 .
  • the plugs 40 may be conical and are removed when the roller cutter 14 needs refilling of lubricant. With this method air escapes the interior of the roller cutter 14 , thus making the refilling of lubricant easier.
  • the seal retainer 38 has a radially outward projecting part 41 at its axially and radially most outward part. Adjacent to, and radially outward from the projecting part 41 is a circumferential indent 42 in the hub 24 .
  • the indent 42 and the projecting part 41 form a labyrinth which further decreases the risk of dirt reaching the interior of the roller cutter 14 .
  • the projecting part 41 is in the form of a ring attached to the seal retainer 38 .
  • This ring 41 can be metallurgically bonded to the seal retainer 38 , preferably by welding.
  • the flange 43 has substantially parallel side surfaces and an end surface substantially parallel to the centre line CL. Further axially inward from the flange 43 , there is a circumferential recess 44 in the hub 24 in order to hold an O-ring 45 in position.
  • One side surface of the flange 43 constitutes a boundary of the recess 44 .
  • the flange 43 and the recess 44 are positioned radially outward from the seal retainer 38 and are axially entirely contained within the seal retainer's 38 axial extension X.
  • a snap ring 47 is used in conjunction with a lock ring (not shown) to lock the seal retainer 38 in position on the shaft 33 .
  • Another O-ring 48 made of a resilient material, prevents leakage between seal retainer 38 and shaft 33 .
  • a dowel pin 49 fixes the seal retainer 38 statically in position thus hindering it from rotational movement.
  • the O-rings, 37 A, 37 B, 45 and 48 are all made of a resilient material. Examples of such materials are silicone, Viton and nitrile rubber. The material chosen depends on the load and temperature the O-ring is supposed to be exposed to.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Sealing Devices (AREA)
US14/778,630 2013-03-20 2014-03-07 Roller cutter with improved sealing Abandoned US20160040482A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP13160149.4 2013-03-20
EP13160149.4A EP2781684A1 (en) 2013-03-20 2013-03-20 Roller cutter with improved sealing
PCT/EP2014/054472 WO2014146913A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing

Publications (1)

Publication Number Publication Date
US20160040482A1 true US20160040482A1 (en) 2016-02-11

Family

ID=47913147

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/778,630 Abandoned US20160040482A1 (en) 2013-03-20 2014-03-07 Roller cutter with improved sealing

Country Status (11)

Country Link
US (1) US20160040482A1 (zh)
EP (1) EP2781684A1 (zh)
CN (1) CN105121773A (zh)
AU (1) AU2014234545A1 (zh)
BR (1) BR112015022729A2 (zh)
CA (1) CA2903301A1 (zh)
CL (1) CL2015002775A1 (zh)
MX (1) MX2015013311A (zh)
PE (1) PE20151581A1 (zh)
RU (1) RU2015144868A (zh)
WO (1) WO2014146913A1 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140338984A1 (en) * 2011-09-16 2014-11-20 Vermeer Manufacturing Company Hole opener bearing arrangement
US20200018163A1 (en) * 2016-09-21 2020-01-16 Master Sinkers (Pty) Ltd Shaft enlargement arrangement for a boring system
CN111322081A (zh) * 2020-03-30 2020-06-23 苏州思丹孚钻具有限公司 新型tbm盾构滚刀装置
US10697246B2 (en) 2015-01-23 2020-06-30 Master Drilling South Africa (Pty) Ltd. Shaft enlargement arrangement for a boring system
US11585158B2 (en) 2020-05-21 2023-02-21 Caterpillar Inc. Isolated lubrication system for drill bits
RU2795402C2 (ru) * 2016-09-21 2023-05-03 Мастер Синкерс (Пти) Лтд Компоновка для расширения ствола шахты для буровой системы

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3868997A1 (en) 2020-02-21 2021-08-25 Sandvik Mining and Construction Tools AB Roller cutting tool with improved sealing

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3449024A (en) * 1965-03-08 1969-06-10 Dresser Ind Seal arrangement between relatively rotatable members
US3572452A (en) * 1969-04-16 1971-03-30 Dougles F Winberg Rolling cutter and seals therefor
SE509184C2 (sv) 1995-06-22 1998-12-14 Sandvik Ab Skärrulle för ett borrhuvud, proppanordning att monteras centralt i en skärrulle samt metod för att motverka inträngning av smuts i en skärrulle
SE508468C2 (sv) * 1996-10-08 1998-10-12 Sandvik Ab Bergborrkrona för roterande, krossande bearbetning av berg samt tätningsorgan till dylik bergborrkrona
SE525429C2 (sv) 2003-01-30 2005-02-22 Sandvik Ab Skärrulle till ett borrhuvud för roterande borrning
CN200982159Y (zh) * 2006-09-29 2007-11-28 天津立林钻头有限公司 牙轮钻头单金属浮动密封总成
CN102661123A (zh) * 2012-05-03 2012-09-12 西南石油大学 一种耐高温的牙轮钻头浮动密封装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140338984A1 (en) * 2011-09-16 2014-11-20 Vermeer Manufacturing Company Hole opener bearing arrangement
US9611698B2 (en) * 2011-09-16 2017-04-04 Vermeer Manufacturing Company Hole opener bearing arrangement
US10697246B2 (en) 2015-01-23 2020-06-30 Master Drilling South Africa (Pty) Ltd. Shaft enlargement arrangement for a boring system
US20200018163A1 (en) * 2016-09-21 2020-01-16 Master Sinkers (Pty) Ltd Shaft enlargement arrangement for a boring system
US10947845B2 (en) * 2016-09-21 2021-03-16 Master Sinkers (Pty) Ltd Shaft enlargement arrangement for a boring system
RU2795402C2 (ru) * 2016-09-21 2023-05-03 Мастер Синкерс (Пти) Лтд Компоновка для расширения ствола шахты для буровой системы
CN111322081A (zh) * 2020-03-30 2020-06-23 苏州思丹孚钻具有限公司 新型tbm盾构滚刀装置
US11585158B2 (en) 2020-05-21 2023-02-21 Caterpillar Inc. Isolated lubrication system for drill bits

Also Published As

Publication number Publication date
BR112015022729A2 (pt) 2018-05-08
MX2015013311A (es) 2016-01-25
WO2014146913A1 (en) 2014-09-25
EP2781684A1 (en) 2014-09-24
CN105121773A (zh) 2015-12-02
CA2903301A1 (en) 2014-09-25
AU2014234545A1 (en) 2015-09-17
RU2015144868A (ru) 2017-04-26
CL2015002775A1 (es) 2016-05-27
PE20151581A1 (es) 2015-11-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SANDVIK INTELLECTUAL PROPERTY AB, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LOIKKANEN, JOONA;BROLUND, STIG-AKE;SIGNING DATES FROM 20150923 TO 20150925;REEL/FRAME:036700/0757

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION