EP0785845B1 - Agencement de soupape pour marteaux-foreurs hydrauliques pour roches - Google Patents

Agencement de soupape pour marteaux-foreurs hydrauliques pour roches Download PDF

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Publication number
EP0785845B1
EP0785845B1 EP95934224A EP95934224A EP0785845B1 EP 0785845 B1 EP0785845 B1 EP 0785845B1 EP 95934224 A EP95934224 A EP 95934224A EP 95934224 A EP95934224 A EP 95934224A EP 0785845 B1 EP0785845 B1 EP 0785845B1
Authority
EP
European Patent Office
Prior art keywords
valve
ports
register
port
valve arrangement
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
EP95934224A
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German (de)
English (en)
Other versions
EP0785845A1 (fr
Inventor
Roger Robarts Briggs
Jarmo Uolevi Leppanen
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0785845A1 publication Critical patent/EP0785845A1/fr
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Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/145—Control devices for the reciprocating piston for hydraulically actuated hammers having an accumulator

Definitions

  • This invention relates generally to a hydraulically operated percussive rock drill and is particularly concerned with a valve arrangement therefore.
  • a valve arrangement having the features as set forth in the preamble portions of claims 1 and 6 is known for example from DE-A-1,703,753.
  • valves are used for controlling oil flow to a reciprocating piston in a rock drill.
  • a spool type valve the shape of the valve spool, inside the rock drill housing, regulates oil flow. Overlapping surfaces close oil inlet lines or oil outlet lines thereby allowing the piston to move.
  • a piloted cartridge closes oil flow through the valve by bringing the cartridge into sealing contact with a valve seat.
  • a common feature of existing valve designs known to the applicants is that when the valve closes oil flow there is only one sealing surface. In a spool-type valve this is provided by the aforementioned overlapping surfaces while in a cartridge-type valve this is provided by a ring surface formed when the cartridge seals against the valve seat.
  • the invention provides a valve arrangement in a hydraulic percussive rock drill having the features as set forth in the characterising portion of claim 1.
  • the cylinder may include first and second cylinder sections and the said first and second surfaces may be formed by opposing outer and inner surfaces of the first and second cylinder sections respectively.
  • the said first and second surfaces may define an annular cylindrical space in which the valve, in the nature of a complementary annular cylindrical sleeve, is located.
  • the invention also extends to a hydraulic percussive rock drill having the features as set forth in the characterising portion of claim 6.
  • the rock drill includes a cylinder which is made from a first cylinder section 12 and a second cylinder section 14. These sections define a chamber 16 in which a piston 18 is located. A port 20 in the first cylinder section 12 is used to admit hydraulic fluid into the chamber 16 to drive the piston in one direction, ie, to the right in the drawing.
  • the sections 12 and 14 define an annular cylindrical space 22 between them. Mounted in the space is a valve 24 in the nature of an annular cylinder, or sleeve.
  • a wall 26 of the section 12 has two ports 28 and 30 formed in it.
  • a wall 32 of the section 14 has ports 34 and 36 formed in it. The valve in turn has ports 38 and 40.
  • Outer sealing surfaces 24A end 24B of the valve are respectively in intimate sliding contact with on outer surface 26A of the wall 26 and on opposed inner surface 32A of the wall 32.
  • the valve is caused, in a known manner, to reciprocate inside the cylindrical space 22.
  • the port 36 is connected to the pressure side of a hydraulic pump end when the port 40 is in register with the ports 30 and 36 fluid flows into the chamber 16 to drive the piston to the left in the drawing.
  • the port 38 is out of register with the ports 28 and 34.
  • Hydraulic fluid can then be exhausted from the right hand side of the chamber and returned to tank.
  • valve 24 has sealing surfaces on it outer and inner walls which mate with the opposing inner and outer surfaces of the walls 32 and 26 of the cylinder sections respectively.
  • sealing surfaces marked 42 and 44 respectively which act in series to minimise oil leakage.
  • the operating valve oil consumption is thereby reduced and there is less heat build-up in the hydraulic system.
  • a lower cooling capacity is required and the viscosity of the oil stays at an acceptable level.
  • There is a higher volumetric efficiency which means that the power output of the rock drill is correspondingly increased.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)

Claims (6)

  1. Agencement de vanne destiné à être utilisé dans une perforatrice au rocher à percussion (10) dans lequel un piston (18), logé dans un vérin (12, 14), et déplacé suivant un mouvement de va-et-vient par un flux de fluide hydraulique, l'agencement de vanne comprenant une vanne (24) commandant le flux de fluide hydraulique, la vanne étant placée entre des première et seconde surfaces (26A, 32A) opposées de deux parois (26, 32) dans lesquelles sont formés au moins des premier et second orifices (28, 34) respectivement, la vanne comportant au moins un troisième orifice (38) qui est déplaçable de façon à être mis en correspondance avec les premier et second orifices, et décalé par rapport à ces derniers, et caractérisé en ce que la vanne comporte des première et seconde surfaces d'étanchéité au fluide hydraulique (24A, 24B) qui coopèrent respectivement avec les première et seconde surfaces (26A, 32A) au moins lorsque le troisième orifice (38) est décalé par rapport aux premier et second orifices (28, 34) et qui forme au moins deux joints d'étanchéité, en série, entre les premier et second orifices.
  2. Agencement de vanne selon la revendication 1, caractérisé en ce que le vérin comprend des première et seconde parties (12, 14) de vérin et les première et seconde surfaces (26A, 32A) sont formées en plaçant de façon opposée des surfaces extérieure et intérieure des première et seconde parties de vérin respectivement.
  3. Agencement de vanne selon la revendication 2, caractérisé en ce que les première et seconde surfaces (26A, 32A) délimitent un espace cylindrique annulaire (22) dans lequel la vanne, sous la forme d'un manchon cylindrique annulaire (24), est placée.
  4. Agencement de vanne selon la revendication 1, 2 ou 3, caractérisé en ce que les quatrième et cinquième orifices (30, 36) sont formés respectivement dans les parois (26, 32) et la vanne (24) comporte un sixième orifice (40) qui est déplaçable de façon à être mis en correspondance avec les quatrième et cinquième orifices (30, 36), et décalé par rapport à ces derniers, les surfaces d'étanchéité (24A, 24B) coopérant avec les première et seconde surfaces (26A, 32A) au moins lorsque le sixième orifice (40) est décalé par rapport au quatrième et cinquième orifices (30, 36).
  5. Perforatrice au rocher à percussion hydraulique (10) qui comprend un piston (18) logé de façon fonctionnelle dans un vérin (12, 14), et qui est caractérisée en ce qu'elle comprend un agencement de vanne selon l'une quelconque des revendications précédentes pour commander le fonctionnement du piston.
  6. Perforatrice au rocher à percussion hydraulique (10) qui comprend un piston (18), des première et seconde parties de vérin (12, 14) qui définissent une chambre (16) dans lequel le piston (18) peut se déplacer suivant un mouvement de va-et-vient et, entre celles-ci, un espace cylindrique annulaire (22) comportant des première et seconde parois (26, 32) opposées, et une vanne (24) déplaçable suivant un mouvement de va et vient qui est placée dans l'espace cylindrique annulaire (22), les première et seconde parois (26, 32) comportant une première paire d'orifices (28, 34) respectifs, et une seconde paire d'orifices (30, 36) respectifs, la vanne comportant un troisième orifice (38) qui est déplacé de façon à être mis en correspondance avec la première paire d'orifices, et être décalé par rapport à cette première paire, et un sixième orifice (40) qui est déplacé de façon à être mis en correspondance avec la seconde paire d'orifices, et être décalé par rapport à cette seconde paire, lorsque la vanne se déplace suivant un mouvement de va-et-vient, de façon à commander le débit de fluide hydraulique dans la chambre (16), et à permettre au fluide hydraulique de s'écouler depuis la chambre, et qui est caractérisée en ce que la vanne comporte des surfaces d'étanchéité (24A, 24B) voisines de chaque extrémité du troisième orifice (38) et du sixième orifice (40) coopérant avec des surfaces opposées respectives (26A, 32a) des première et seconde parois.
EP95934224A 1994-10-17 1995-10-17 Agencement de soupape pour marteaux-foreurs hydrauliques pour roches Expired - Lifetime EP0785845B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
ZA948118A ZA948118B (en) 1994-10-17 1994-10-17 Valve arrangement in a hydraulic percussive rock drill
ZA9408118 1994-10-17
PCT/GB1995/002453 WO1996011775A1 (fr) 1994-10-17 1995-10-17 Agencement de soupape pour marteaux-foreurs hydrauliques pour roches

Publications (2)

Publication Number Publication Date
EP0785845A1 EP0785845A1 (fr) 1997-07-30
EP0785845B1 true EP0785845B1 (fr) 1999-06-30

Family

ID=25584482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95934224A Expired - Lifetime EP0785845B1 (fr) 1994-10-17 1995-10-17 Agencement de soupape pour marteaux-foreurs hydrauliques pour roches

Country Status (8)

Country Link
EP (1) EP0785845B1 (fr)
JP (1) JPH10509382A (fr)
AT (1) ATE181691T1 (fr)
AU (1) AU686021B2 (fr)
CA (1) CA2202521C (fr)
DE (1) DE69510557D1 (fr)
WO (1) WO1996011775A1 (fr)
ZA (1) ZA948118B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1125755A (en) * 1965-04-23 1968-08-28 Vickers Ltd Improvements in or relating to hydraulically operated tools
DE1703753A1 (de) * 1968-07-05 1972-02-24 Ingbuero Dipl Ing Friedrich He Hydraulisch betriebene Schlagvorrichtung
JPS5819433B2 (ja) * 1977-03-17 1983-04-18 日本ニユ−マチツク工業株式会社 衝撃動工具
WO1994023906A1 (fr) * 1993-04-21 1994-10-27 Roger Robarts Briggs Mecanisme de percussion pour dispositif de perforation de roche

Also Published As

Publication number Publication date
AU3659595A (en) 1996-05-06
DE69510557D1 (de) 1999-08-05
WO1996011775A1 (fr) 1996-04-25
CA2202521A1 (fr) 1996-04-25
CA2202521C (fr) 2001-04-24
EP0785845A1 (fr) 1997-07-30
ZA948118B (en) 1996-03-25
ATE181691T1 (de) 1999-07-15
AU686021B2 (en) 1998-01-29
JPH10509382A (ja) 1998-09-14

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