EP0099594B1 - Dispositif pour forer dans la roche - Google Patents

Dispositif pour forer dans la roche Download PDF

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Publication number
EP0099594B1
EP0099594B1 EP83200711A EP83200711A EP0099594B1 EP 0099594 B1 EP0099594 B1 EP 0099594B1 EP 83200711 A EP83200711 A EP 83200711A EP 83200711 A EP83200711 A EP 83200711A EP 0099594 B1 EP0099594 B1 EP 0099594B1
Authority
EP
European Patent Office
Prior art keywords
piston
stem
drill
ratio
length
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
Application number
EP83200711A
Other languages
German (de)
English (en)
Other versions
EP0099594A3 (en
EP0099594A2 (fr
Inventor
John Arthur Hurt
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.)
WEAVER AND HURT Ltd
Original Assignee
WEAVER AND HURT Ltd
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 WEAVER AND HURT Ltd filed Critical WEAVER AND HURT Ltd
Priority to AT83200711T priority Critical patent/ATE18082T1/de
Publication of EP0099594A2 publication Critical patent/EP0099594A2/fr
Publication of EP0099594A3 publication Critical patent/EP0099594A3/en
Application granted granted Critical
Publication of EP0099594B1 publication Critical patent/EP0099594B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/06—Down-hole impacting means, e.g. hammers
    • E21B4/14—Fluid operated hammers

Definitions

  • This invention relates to rock drilling equipment and is particularly concerned with rock drills of the down-the-hole type where the drill is secured to a first tube down which compressed air is passed to activate the drill, as many tubes as are required being successfully secured to a preceding tube to allow a hole to be drilled to the depth required.
  • the present invention relates to the type of drill disclosed for example in U.S. Patent Specifications 3085555 and 3198264 incorporating a flap valve to allow the application of compressed air through appropriate porting to one side or the other of a piston which can thus be reciprocated within its cylinder to repeatedly strike the end of a drill bit secured to the drill.
  • Rock drilling is by its very nature a particularly expensive exercise because of the need to employ such cost capital plant, and obviously the more rapidly can a.hole be drilled the less expensive does rock drilling become on a cost per hole basis. Considerable attention has been given to increasing the speed at which a hole of a required diameter can be cut and despite the extensive attention that this problem has been given over a considerable number of years, drilling speeds, for practical purposes, have not been increased to any noticeable extent.
  • an air operated down-the-hole drill comprises a backhead for the connection of a drill to a source of compressed air, a wear sleeve secured to the backhead and a chuck adapted to retain a drill bit secured to the opposite end of the wear sleeve, there being within the wear sleeve an inner cylinder with a valve seat at one (inner) end of the cylinder having a valve stem extending into the cylinder and a piston within the cylinder reciprocable therein from one position where the valve stem engages in a bore in the piston to a second position where a stem on the piston enters a bearing located in the cylinder and strikes a drill bit held within the chuck, characterised in that the dimensions of the piston are such that the ratio of the piston head diameter to its bore diameter is in the range 9.9/9.95 to 1, the ratio of the piston head length to the piston stem length is in the range 1.5/1.52 to 1, the ratio of the - piston head diameter to the piston stem diameter is in the range 1.4/1.43
  • piston weight is obviously dictated by its size but the piston weight is believed to be equally critical. Thus, for example, with a 75 mm rock drill the piston weight should be in the range 2.5 kg to 2.53 kg.
  • a rock drill of the type defined comprises a valve seat wherein the ratio of the cross-sectional area of the part of the valve seat within the cylinder to the cross-sectional area of the stem of the valve seat is in the range 0.09/0.10 to 1, the ratio of the stroke length of the piston to the length of the stem of the valve seat is 0.87/0.88 to 1 and the ratio of the net internal length of the bearing to the stroke length of the piston is in the range 0.56/0.57 to 1.
  • a rock drill comprises a wear sleeve 1 at one (bottom) end of which is provided a chuck 2 to receive a drill bit (not shown), the drill bit being held by a retaining ring 3.
  • a cylinder 4 having upper and lower ports 5, 6 the outer diameter of the cylinder and the inner diameter of the wear sleeve 1 being such that an annular gap is provided between them.
  • an integral bearing 7 At the bottom end of the cylinder there is provided an integral bearing 7 and within the cylinder is a piston 8, the piston having a stem 9 which engages in and is a close sliding fit with the bearing.
  • an integral valve-seat 10 on which rests a flap valve 11 held in place by a pin 12, the integral seat 10 having a stem 13 which extends into the cylinder to be engaged by the bore 14 of the piston 8 which bore extends to ports 15 emerging in the piston stem 9.
  • the valve seat 10 are two sets of passageways 16, 17 for selective closing by the flap valve 11, the passageways 16 extending directly through the valve seat to emerge in the cylinder alongside the stem 13, and the passageways 17 emerging at the side wall of the integral seat.
  • valve chest 18 having a through bore partially closed by an air metering plug 19 the valve chest being held in place by a spring 20 on which rests a check valve 21, the whole assembly being held in place with sealing rings 22 and a spacer 23 by a backhead 24 secured to the (top) end of the wear sleeve.

Claims (3)

1. Perforatrice de fond de trou de forage à air comprimé, comprenant une tête arrière (24) destinée à raccorder la perforatrice à une source d'air comprimé, un manchon d'usure (1) fixé à la tête arrière (24) et un mandrin (2) adapté pour retenir un outil de forage fixé à l'extrémité opposée du manchon d'usure (1 et dans laquelle il est prévu, à l'intérieur du manchon d'usure (1 ), un cylindre intérieur (4) muni d'un siège de soupape (10) placé à une extrémité (extrémité intérieure) du cylindre (4) et possédant une tige de soupape (13) qui s'engage dans le cylindre (4) et un piston (8) logé dans le cylindre (4) et pouvant se déplacer alternativement dans ce dernier entre une position, dans laquelle la tige (13) de la soupape est engagée dans un alésage (14) du piston (8) et une deuxième position dans laquelle une tige (9) du piston est engagée dans une portée (7) logée dans le cylindre et frappe un outil de forage tenu dans le mandrin (2), caractérisée en ce que les dimensions du piston sont telles que le rapport du diamètre de la tête (8) du piston au diamètre de son alésage (14) est compris dans l'intervalle de 9,9 à 9,95/1, le rapport de la longueur de la tête (8) du piston à la longueur de la tige (9) du piston est compris dans l'intervalle de 1,5 à 1,52/1, le rapport du diamètre de la tête (8) du piston au diamètre de la tige (9) du piston est compris dans l'intervalle de 1,4 à 1,43/1 et le rapport de la longueur de la tige (9) du piston à la longueur de la tige de ce piston qui est contenue dans la portée (7), au point où le piston frappe l'outil de forage, est de 1,4 à 1,45/1.
2. Perforatrice de fond de trou de forage à aîr comprimé selon la revendication 1, dans laquelle, pour un outil de forage du rocher de 75 mm, le poids du piston est compris dans l'intervalle de 2,5 kg à 2,53 kg.
3. Perforatrice de fond de trou de forage à air comprimé selon la revendication 1 ou la revendication 2, caractérisée par un siège de soupape (10) dans lequel le rapport de l'aire de la section de la partie du siège de soupape (10) contenue dans le cylindre (4) à l'aire de la section de la tige (13) du siège de soupape est compris dans l'intervalle de 0,09 à 0,10/1, le rapport de la longueur de la course du piston (8) à la longueur de la tige (13) du siège de soupape est de 0,87 à 0,88/1 et le rapport de la longueur intérieure nette de la portée (7) à la longueur de la course du piston est compris dans l'intervalle de 0,56 à 0,57/1.
EP83200711A 1982-07-23 1983-05-19 Dispositif pour forer dans la roche Expired EP0099594B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83200711T ATE18082T1 (de) 1982-07-23 1983-05-19 Gesteinbohrmaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8221377 1982-07-23
GB8221377 1982-07-23

Publications (3)

Publication Number Publication Date
EP0099594A2 EP0099594A2 (fr) 1984-02-01
EP0099594A3 EP0099594A3 (en) 1984-04-25
EP0099594B1 true EP0099594B1 (fr) 1986-02-19

Family

ID=10531869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83200711A Expired EP0099594B1 (fr) 1982-07-23 1983-05-19 Dispositif pour forer dans la roche

Country Status (4)

Country Link
EP (1) EP0099594B1 (fr)
AT (1) ATE18082T1 (fr)
CA (1) CA1203728A (fr)
DE (1) DE3362163D1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3085555A (en) * 1960-05-31 1963-04-16 Ingersoll Rand Co Pneumatic hammer rock drill
BE637490A (fr) * 1962-09-17
AU522224B2 (en) * 1975-01-13 1982-05-20 Abraham Gien Percussion drill piston
US4163478A (en) * 1978-09-15 1979-08-07 Adcock Gerald L Self aligning impact rock drilling tool
EP0040026A1 (fr) * 1980-05-09 1981-11-18 Halifax Tool Company Limited Machine à piston libre
EP0043291B1 (fr) * 1980-07-01 1985-05-02 Greame Rear Ian Outils à percussion actionnés par un fluide sous pression
ZA816261B (en) * 1980-09-11 1982-09-29 Ian Graeme Rear Fluid operated hammer

Also Published As

Publication number Publication date
EP0099594A3 (en) 1984-04-25
DE3362163D1 (en) 1986-03-27
EP0099594A2 (fr) 1984-02-01
CA1203728A (fr) 1986-04-29
ATE18082T1 (de) 1986-03-15

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